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JP2016012934

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2016012934
An object of the present invention is to make a speaker apparatus thinner or smaller. A housing
includes a speaker device, a housing, and a vibrating portion housed in the housing, and the
housing includes an inclined surface portion whose thickness decreases from the vibrating
portion toward the side of the housing. [Selected figure] Figure 22
Speaker device
[0001]
The present invention relates to a speaker device.
[0002]
The speaker device includes a diaphragm, a voice coil, and a magnetic circuit as a basic
configuration.
In the conventional speaker device described in Patent Document 1 below, the diaphragm is
provided with a relatively flat diaphragm main body made of foamed mica etc., and the outer
peripheral portion of the diaphragm is supported by the frame via the edge. . A voice coil is
provided on the lower surface of the diaphragm body, and the voice coil is disposed in the
magnetic gap of the magnetic circuit.
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[0003]
Japanese Utility Model Application Publication No. 62-147991
[0004]
The speaker device is equipped in various electronic devices that generate sound.
Under the present circumstances, when equipped with a portable electronic device, for example,
thickness reduction and size reduction of a speaker apparatus are calculated | required in order
to improve the portable holding property.
[0005]
It is an object of the present invention to reduce the thickness or size of the speaker device.
[0006]
In order to achieve such an object, the speaker device according to the present invention at least
has the following configuration.
A housing, and a vibrating portion housed in the housing, the housing includes an inclined
surface portion whose thickness decreases from the vibrating portion toward the side of the
housing. Speaker device.
[0007]
It is an explanatory view explaining a speaker device concerning an embodiment of the present
invention (the figure (a) is a longitudinal section, and the figure (b) is an A section enlarged view).
It is explanatory drawing which showed the other form of the vibration part of the speaker
apparatus based on embodiment of this invention. Sectional drawing which showed the whole
structure of the speaker apparatus based on embodiment of this invention. The elements on
larger scale sectional drawing of FIG. Explanatory drawing which shows the detail of the edge of
the speaker apparatus based on embodiment of this invention. X1-X1 sectional drawing of FIG.
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Explanatory drawing (the figure (a) is a top view, the figure (b) is a perspective view) which
showed the whole structure of the magnetic circuit in the speaker apparatus based on
embodiment of this invention. Explanatory drawing which shows the magnetic circuit in the
speaker apparatus based on embodiment of this invention. Explanatory drawing which showed
the attachment structure which attaches the magnetic circuit in the speaker apparatus based on
embodiment of this invention to a stationary part. Explanatory drawing which showed the
attachment structure which attaches the magnetic circuit in the speaker apparatus based on
embodiment of this invention to a stationary part. Explanatory drawing which showed the
attachment structure which attaches the magnetic circuit in the speaker apparatus based on
embodiment of this invention to a stationary part. Explanatory drawing which showed the
attachment structure which attaches the magnetic circuit in the speaker apparatus based on
embodiment of this invention to a stationary part. Explanatory drawing which showed the
structure of the terminal part in the speaker apparatus based on embodiment of this invention.
Explanatory drawing which showed the structure of the terminal part in the speaker apparatus
based on embodiment of this invention. Explanatory drawing which showed the structure of the
terminal part in the speaker apparatus based on embodiment of this invention. BRIEF
DESCRIPTION OF THE DRAWINGS The external appearance perspective view which showed the
whole structure of the speaker apparatus which concerns on embodiment of this invention.
BRIEF DESCRIPTION OF THE DRAWINGS The external appearance perspective view which
showed the whole structure of the speaker apparatus which concerns on embodiment of this
invention. Explanatory drawing which showed the application example of the speaker apparatus
based on embodiment of this invention. Explanatory drawing which showed the application
example of the speaker apparatus based on embodiment of this invention. It is an explanatory
view showing an example of mounting to a electronic device of a speaker apparatus concerning
an embodiment of the present invention. It is an explanatory view showing an example of
mounting to a electronic device of a speaker apparatus concerning an embodiment of the present
invention. It is an explanatory view showing an example of mounting to a electronic device of a
speaker apparatus concerning an embodiment of the present invention.
[0008]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings. The following drawings are explanatory views for explaining a speaker device
according to an embodiment of the present invention. In the drawings, the same reference
numerals are given to the parts common to each other, and the overlapping explanation will be
partially omitted. The illustrated X direction is the acoustic radiation direction, and the illustrated
Y direction is the radial direction (width direction) of the speaker device.
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[0009]
FIG. 1 is an explanatory view showing a basic configuration of a speaker device according to an
embodiment of the present invention, wherein FIG. 1 (a) is a longitudinal sectional view and FIG.
1 (b) is an enlarged view of a portion A in FIG. It is.
[0010]
The speaker device 1 includes a stationary unit 10, a vibrating unit 20, and a magnetic circuit 30.
The vibrating portion 20 includes a vibrating body 21 having an outer peripheral portion 21A,
an edge 22 supporting the vibrating body 21 to the stationary portion 10, and a voice coil 25
supported by the vibrating body 21 directly or through another member. . The vibrating body 21
and the edge 22 are composed of members different from each other. The edge 22 has a
laminated structure in which a plurality of resin layers 22a1 and 22a2 formed of resin films are
laminated. The rigidity of the vibrating body 21 is greater than the rigidity of the edge 22.
[0011]
Although the resin layers 22a1 and 22a2 of the edge 22 are two layers in the illustrated
example, the present invention is not limited to this. For example, the edge 22 may comprise
multiple layers. The edge 22 can also be formed of only the plurality of resin layers 22a1 and
22a2. Also, as described later, the edge 22 can be configured in combination with other layers.
The magnetic circuit 30 comprises a plate, a yoke, a magnet, etc., which will be described later,
forms a magnetic gap 30G, and the voice coil 25 is disposed in the magnetic gap 30G.
[0012]
The speaker device 1 includes the vibrating body 21 having rigidity greater than that of the edge
22 and the vibrating body 21 having the predetermined internal loss and the edge 22 by using
the vibrating body (diaphragm) 21 and the edge 22 as separate members. be able to. Such a
speaker device 1 can make the vibrating portion 20 (the vibrating body 21 and the edge 22)
relatively thin without providing the vibrating body 21 with a reinforcing portion such as a rib. In
addition, you may provide reinforcement parts, such as a rib as shown by FIG. 3 mentioned later,
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in the vibrating body 21 as needed. Moreover, the edge 22 can be equipped with a comparatively
big internal loss, having rigidity which can support the vibrating body 21 vibratably by providing
a multilayer structure.
[0013]
In a thinner and smaller speaker device, the diaphragm and the edge may be integrally formed.
When the diaphragm and the edge are integrally formed, when the common member of the
diaphragm and the edge is formed of a relatively soft material, the acoustic characteristics on the
high frequency side may be degraded. On the other hand, if the common member of the
diaphragm and the edge is hardened, the acoustic characteristics on the low frequency side may
be degraded. It is also conceivable to increase the rigidity by forming a common member of the
diaphragm and the edge with a relatively soft material and providing a reinforcing portion such
as a rib on the vibrator. However, when such a reinforcing portion is provided on the vibrating
body, the thickness of the vibrating body becomes relatively large, and it is difficult to achieve
thinning and downsizing of the speaker device. On the other hand, in the speaker device 1
described in the present embodiment, the acoustic characteristics in the low band and the high
band can be improved.
[0014]
According to the speaker device 1, the upper limit frequency can be shifted out of the audible
range by providing the vibrating body 21 with relatively large rigidity. In addition, by providing
the edge 22 with a relatively large internal loss, it is possible to make the peak at the low
frequency reproduction frequency relatively small. Further, by providing the vibrating body 21
with a relatively large internal loss, it is possible to make the peak value in the vicinity of the
upper limit frequency relatively small, and it is possible to flatten the acoustic characteristic from
the low range to the high range.
[0015]
In the example illustrated in FIG. 1B, the edge 22 includes a plurality of resin layers 22a1 and
22a2 and a soft layer 22b that is soft with respect to the resin layers 22a1 and 22a2. In this
example, the thickness (b) of the soft layer 22b is larger than the thickness (a1 + a2) of the
plurality of resin layers 22a1 and 22a2. The Young's modulus of the edge 22 is smaller than the
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Young's modulus of a comparative edge (having the same thickness as the edge 22 to be
compared) formed of a single layer made of the same material as the resin layers 22a1 and 22a2.
The internal loss of the edge 22 is larger than the internal loss of the comparison edge described
above.
[0016]
Since the soft layer 22b is thicker than the resin layers 22a1 and 22a2 in the edge 22 composed
of the plurality of resin layers 22a1 and 22a2 and the soft layer 22b, the physical properties of
the soft layer affect the physical properties of the edge 22 than the resin layers 22a1 and 22a2
Is large. That is, the physical properties of the soft layer 22b become dominant factors of the
physical properties of the edge 22, and the internal loss of the edge 22 can be made relatively
large. As a result, it is possible to reduce the peak value in the vicinity of the lower resonance
frequency appearing in the acoustic characteristics, and to flatten the acoustic characteristics.
[0017]
The plurality of resin layers 22a1 and 22a2 included in the edge 22 can be formed of a common
resin member or a common resin material. Among the plurality of different resin materials
constituting the resin members constituting the plurality of resin layers 22a1 and 22a2 as the
common resin material, at least one resin material may be common. Here, the common resin
member means that the resin members have substantially the same density and that the Young's
modulus and the internal loss are substantially the same. Further, the common resin material
means that they are resin materials having substantially the same density as each other and that
the Young's modulus and internal loss are substantially the same. According to this, for example,
when the plurality of resin layers 22a1 and 22a2 of the edge 22 are formed of a common resin
member (a resin member having substantially the same Young's modulus, internal loss, and
density as each other) Peeling between resin layers can be suppressed by deformation
accompanying shrinkage and the like.
[0018]
Further, as necessary, the plurality of resin layers 22a1 and 22a2 of the edge 22 can be made of
different resin members. For the resin layers 22a1 and 22a2, for example, the resin members
may be selected such that the glass transition temperature of the resin member of the resin layer
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22a1 is higher than the glass transition temperature of the resin layer 22a2. Specifically, the
resin layer 22a1 may be made of a resin member made of PEEK as a resin material, and the resin
layer 22a2 may be made of a resin member made of PET as a resin material. In addition, a resin
layer having a resin material having a relatively high glass transition temperature is disposed on
the voice coil 25 side, and an edge 22 having a resin layer having a resin material having a
relatively low glass transition temperature disposed on the vibrator 21 side is used. I don't care.
[0019]
In the illustrated example, the inner peripheral portion 22A of the edge 22 is attached to the
surface (surface facing the magnetic circuit 30; rear surface) of the vibrating body 21 on the
magnetic circuit 30 side. The voice coil 25 is connected to the vibrating body 21 via the inner
circumferential portion 22A of the edge 22. The upper end of the voice coil 25 is connected to
the inner circumferential portion 22A of the edge 22.
[0020]
In this example, the resin film constituting the resin layer 22a2 disposed on the voice coil side of
the edge 22 has a glass transition temperature of 100 ° C. or higher. Moreover, the resin film is
mainly comprised with the resin material whose glass transition temperature is 100 degreeC or
more. Specifically, the resin film includes PEN (polyether naphthalate, glass transition
temperature = 155 ° C), PEEK (polyether / ether ketone, glass transition temperature = 143 °
C), PET (polyester, glass transition temperature = 115 ° C.) or the like can be used.
[0021]
In the example of illustration, while the vibrating body 21 is flat form, the vibrating body 21 is
comprised with the rigid vibration member of a ceramic type. Since a ceramic-based rigid
vibration member is used for the vibrator 21, the Joule heat of the voice coil 25 propagates to
the edge 22 and the vibrator 21, and the Joule heat is stored in the vibrator 21. Since Joule heat
is stored in the vibrator 21, the temperature of the inner peripheral portion 22A of the edge 22
rises, and the edge 22 can not follow the vibrator 21 unless the material of the edge 22 is
properly selected. On the other hand, since the speaker device 1 uses a resin film having a
relatively high glass transition temperature as the resin layer 22a2 of the edge 22, even if Joule
heat is stored in the vibrator 21, the edge 22 is a vibrator. It can follow 21. Further, by using a
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resin film having a relatively high glass transition temperature as the edge 22, the temperature of
the edge 22 becomes relatively high, and even if the physical property of the edge 22 changes in
temperature, the vibrator 21 can vibrate in the stationary portion 10. Support. Further, by using
a resin film having a relatively high glass transition temperature as the edge 22, the voice coil 25
can be disposed at a predetermined position with respect to the magnetic circuit 30 while the
speaker device is being driven. Further, by using a resin film having a relatively high glass
transition temperature as the edge 22, the vibration of the vibrating body 21 can be regulated
while the speaker device is being driven. In addition, when the vibrating body 21 is formed of a
ceramic-based rigid vibrating member, the weight is reduced, so that the sound pressure can be
relatively increased.
[0022]
In the speaker device 1, a ceramic-based rigid vibration member having a relatively small
strength against an external impact by interposing an edge 22 relatively softer than the vibration
body 21 between the vibration body 21 and the voice coil 25. Can be used for the vibrator 21.
According to this, for example, an electronic device (such as a portable electronic device) on
which the speaker device 1 is mounted may drop and an impact may be applied. At this time, the
voice coil 25 may contact a yoke of the magnetic circuit 30 (described later) included in the
magnetic circuit 30, and the voice coil 25 may apply a relatively large external force (impact) to
the vibrating body 21. At this time, since the vibrating body 21 is connected to the voice coil 25
through the edge 22, generation of a defect such as a crack can be suppressed in the vibrating
body 21. Also, the edge 22 is a buffer member that relieves the external force of the voice coil
25.
[0023]
The rigid vibration member can be substantially made of carbon (for example, carbon ceramic).
Moreover, a rigid vibration member can be comprised by the structural member which has a
foam layer which has a foam structure, and the coating layer which covers this foam layer. The
coating layer which this rigid vibration member has is a layer formed continuously. The density
of the cover layer is greater than the density of the foam layer. Also, the porosity of the cover
layer is smaller than the density of the foam layer. The porosity (%) referred to here is (1- [weight
of foam layer or covering layer (g)] / [density of constituent material (g / m <3>)] / [volume of
foam layer or covering layer It is represented by m <3>)]) × 100.
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[0024]
The common resin member or common resin material in the plurality of resin layers 22a1 and
22a2 of the edge 22 can be a polyether / ether ketone resin, a polyetherimide resin, or a
polyester resin. The soft layer 22b of the edge 22 can be made of, for example, an acrylic resin. If
necessary, the soft layer 22 b can be made of a water-dispersed resin material (emulsion resin) or
an adhesive.
[0025]
FIG. 2 is an explanatory view showing another form of the vibrating portion provided in the
speaker device according to the embodiment of the present invention. In the vibrating portion
20, the vibrating body 21 and the edge 22 are connected via the voice coil support portion 27.
The voice coil support portion 27 supports a voice coil 25. The density of the constituent
members of the voice coil support portion 27 is smaller than the density of the constituent
members of the vibrating body 21 and the edge 22.
[0026]
In the illustrated example, the vibration body 21 has a dome shape, and the upper end portion of
the voice coil support portion 27 is connected to the outer peripheral portion thereof. As the
vibrating body 21, for example, a metal material such as aluminum or magnesium can be used as
a material different from the edge 22. The inner peripheral portion of the edge 22 is connected
to the outer peripheral side surface of the voice coil support portion 27, and the outer peripheral
portion of the edge 22 is connected to the stationary portion 10. The edge 22 can be comprised
by several resin layer 22a1, 22a2 and the soft layer 22b as mentioned above. For example, a
lightweight member such as paper can be used as the voice coil support 27. According to this, it
is possible to improve the acoustic characteristics while reducing the size and weight of the
speaker device 1.
[0027]
FIG. 3 is a cross-sectional view showing the overall configuration of the speaker device according
to the embodiment of the present invention, and FIG. 4 is a partially enlarged cross-sectional
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view thereof. The speaker device 1 includes a stationary unit 10, a vibrating unit 20, and a
magnetic circuit 30. The vibrating unit 20 includes a vibrating body 21, an edge 22 supporting
the vibrating body 21 to the stationary unit 10, and a voice coil 25 supported by the vibrating
body 21 directly or through another member. The magnetic circuit 30 includes a magnetic gap
30G configured by the first magnetic pole portion 31 and the second magnetic pole portion 32,
and a magnet 35 (inner magnet 35B). The voice coil 25 is disposed in the magnetic gap 30G. The
vibrating unit 20 is vibratably supported by the stationary unit 10. In FIG. 3, the first magnetic
pole portion 31 is the plate 34, and the second magnetic pole portion 32 is the yoke 33. The
edge 22 is formed separately from the vibrating body 21 and is bonded to the vibrating body 21
directly or through another member such as an adhesive. Note that FIG. 3 shows that the edge 22
is disposed on the magnetic circuit 30 side with respect to the upper surface of the vibrating
body 21. In particular, the inner peripheral portion of the edge 22 is bonded to the lower surface
of the vibrating body 21 directly or through another member such as an adhesive.
[0028]
[Structure of Vibrating Section and Positional Relationship Between Vibrating Section and Other
Parts] The vibrating body 21 itself has rigidity, and the outer peripheral portion 21A of the
vibrating body 21 having rigidity protrudes to the outside of the voice coil 25. . Thus, by causing
the outer peripheral portion 21A to protrude to the outside of the voice coil 25, the edge 22
approaches the yoke 33 from a position separated from the voice coil 25 supported by the
vibrating body 21 by the protrusion of the outer peripheral portion 21A. It will bend. Therefore,
when the voice coil 25 vibrates in the magnetic gap 30G, the vibrating body 21 has a structure in
which the curved portion of the edge 22 does not easily interfere with the upper portion of the
second magnetic pole portion 32 (yoke 33).
[0029]
Further, in the illustrated example, the outer peripheral portion 21A of the vibrating body 21 is
disposed near or outside the position of the second magnetic pole portion 32 in the radial
direction (Y direction in the drawing). That is, the outer peripheral portion 21A of the vibrating
body 21 is disposed on the wall portion 33B of the yoke 33 to be the second magnetic pole
portion 32, as shown in FIG. 4 and FIG. Further, the outer peripheral portion 21A of the vibrating
body 21 extends in the vicinity of the position of the wall 33B of the yoke 33 or to the outside. In
the illustrated example, the outer peripheral portion 21A of the vibrating body 21 is disposed
near or outside the position of the inner side surface of the wall portion 33B. Further, without
being limited to the illustrated example, it may be disposed near the position of the outer side
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surface of the wall 33B or outside. According to this, when the curved portion of the edge 22 is
formed from the outer peripheral portion 21A, the curved portion of the edge 22 is formed at the
position outside the magnetic gap 30G. Therefore, the curved portion of the edge 22 hardly
interferes with the second magnetic pole portion 32 (yoke 33) forming the magnetic gap 30G.
[0030]
FIG. 5 shows details of the edge 22. The edge 22 is disposed on the second magnetic pole portion
32, and has a first curved portion 23 having a convex shape in the acoustic radiation direction (X
direction in the drawing), and a concave second curved portion 24. Is equipped. The second
curved portion 24 is provided continuously to the first curved portion 23. Thus, a part of the
second curved portion 24 continuous with the first curved portion 23 is less likely to interfere
with the second magnetic pole portion 32. Specifically, since the second curved portion 24 is
separated from the wall portion 33B of the yoke 33 by the size of the first curved portion 23 in
the radial direction, the second curved portion 24 hardly interferes with the second magnetic
pole portion 32.
[0031]
The first curved portion 23 is disposed on and in the vicinity of the second magnetic pole portion
32, and the second curved portion 24 is disposed outside the first curved portion 23. As a result,
the top 24C of the second curved portion 24 can be positioned outside (the Y direction) of the
second magnetic pole 32, and the top 24C that is most likely to interfere is the second magnetic
pole 32 (yoke 33). It becomes possible to provide in the position away from.
[0032]
The inner circumferential portion 23A of the first curved portion 23 supports the vibrating body
21. Further, the inner circumferential portion 23A of the first bending portion 23 is disposed at a
position higher than the second circumferential portion 24A of the second bending portion 24
with respect to the second magnetic pole portion 32. That is, the height h1 from the second
magnetic pole portion 32 to the inner circumferential portion 24A of the second curved portion
24 and the height h2 from the second magnetic pole portion 32 to the inner circumferential
portion 23A of the first curved portion 23 are In comparison, h1 <h2. In this manner, a relatively
large gap can be provided between the second magnetic pole portion 32 and the inner
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circumferential portion 23A of the first curved portion 23.
[0033]
The edge 22 includes an apex 23C provided between the inner circumferential portion 23A and
the outer circumferential portion 23B of the first curved portion 23. The top 23 </ b> C of the
first curved portion 23 is disposed in the vicinity of the outer peripheral portion 21 </ b> A of
the vibrating body 21. In addition, the top 23C of the first bending portion 23 is disposed at
substantially the same height as the vibrating body 21 with respect to the magnetic circuit 30,
and the inner circumferential portion 23A of the first bending portion 23 is It is disposed at
substantially the same height with respect to the top portion 23C of the first curved portion 23.
Thus, by forming the first curved portion 23 having the top portion 23C, the inner peripheral
portion 24A of the second curved portion 24 is on the side of the vibrating body 21 from the
second magnetic pole portion 32 and at a separated position. It can be provided.
[0034]
Further, the first curved portion 21 has a length L1 along the radial direction. The second curved
portion 24 has a length obtained by adding the lengths L2 and L3 along the radial direction.
Here, the length L2 is the length from the inner peripheral portion 24A to the top 24C of the
second curved portion 24, and the length L3 is the length from the top 24C to the outer
peripheral portion 24B of the second curved portion 24. is there. By providing the first bending
portion 23 between the second bending portion 24 and the vibrator 21, the top 24C of the
second bending portion 24 is separated from the second magnetic pole portion 32 by the length
L1. It can be provided at any position. Therefore, a relatively large gap can be provided between
a part of the second curved portion 24 and the second magnetic pole portion 32 in the height
direction, and the second curved portion 24 serves as the second magnetic pole portion. It is
possible to prevent interference with 32.
[0035]
When the vibrator 21 is at rest (when the voice current is not input to the voice coil 25), the
outer peripheral portion 22B of the edge 22 is higher than or substantially the same height as
the inner peripheral portion 22A of the edge 22. It is arranged. Along with the vibration of the
voice coil 25, the inner circumferential portion 22A of the edge 22 vibrates up and down from
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the outer circumferential portion 22B of the edge 22. As described above, by employing a
structure in which the inner peripheral portion 22A of the edge 22 does not protrude from the
outer peripheral portion 22B of the edge 22 toward the acoustic radiation side, the speaker
device 1 can be thinned.
[0036]
The second curved portion 24 has a top portion 24C provided between the inner circumferential
portion 24A and the outer circumferential portion 24B. The top 24 C of the second curved
portion 24 is disposed outside with respect to the position of the second magnetic pole portion
32 and is provided at a high position with respect to the second magnetic pole portion 32. By
arranging in this manner, although the top 24 C of the second curved portion 24 may approach
the second magnetic pole portion 32 with the vibration of the voice coil 25, a part of the second
curved portion 24 is It can be arranged so as not to contact the second magnetic pole portion 32.
[0037]
A distance S1 between the second magnetic pole portion 32 and a part of the stationary portion
10 supporting the edge 22 in the radial direction (Y direction shown) is the distance between the
inner peripheral portion 22A of the edge 22 and the outer peripheral portion 22B. It is formed
smaller than the distance S2. The height of the second magnetic pole portion 32 in the vibration
direction of the voice coil 25 is provided lower than the height of the first magnetic pole portion
31 (there is a difference in the height of Δh in FIG. 4). The distance (h3 + Δh) to the second
magnetic pole portion 32 is formed larger than the distance (h3) of the first magnetic pole
portion 31 from the vibrating body 21.
[0038]
The radius of curvature R1 of the first curved portion 23 is smaller than the radius of curvature
R2 of the second curved portion 24, and the first curved portion 23 has a bending rigidity
greater than that of the second curved portion 24. In the case where the radius of curvature R1
of the first curved portion 23 is relatively large, the first curved portion 23 may be easily bent
(deformable) and may easily interfere with the second magnetic pole portion 32. In addition,
unnecessary resonance (including split resonance and reverse resonance) may occur. In addition,
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with the occurrence of this unnecessary resonance, a rolling phenomenon may be induced. When
the radius of curvature R1 of the first curved portion 23 as described above is made relatively
small, the occurrence of unnecessary resonance can be suppressed, and acoustic characteristics
can be improved.
[0039]
The second curved portion 24 of the edge 22 includes a reinforcing portion 24E projecting from
the surface 24D of the second curved portion 24 along the radial direction, and the reinforcing
portion 24E of the second curved portion 24 is formed of a second curved portion It is disposed
between the outer peripheral portion 24B and the inner peripheral portion 24A of the curved
portion 24 and extends to the vicinity of the outer peripheral portion 23B of the first curved
portion 23. In the illustrated example, the reinforcing portion 24E extends from near the position
of the inner circumferential portion 24A of the second curved portion 24 to near the position of
the outer circumferential portion 24B. According to this, the reinforcement part 24E can ensure
the amplitude of the vibrating body 21 effectively by the 2nd curved part 24 with a large curved
diameter. In addition, since the reinforcing portion 24E imparts appropriate rigidity to the
second curved portion 24, the edge 22 can support the vibrating body 21 at a predetermined
position. In addition, it is possible to suppress the occurrence of the rolling phenomenon (rolling)
in the voice coil 25. In addition, when the vibrating body 21 vibrates, the edge 22 may be
deformed in the circumferential direction to cause wrinkles at the corner of the edge. In addition,
due to the occurrence of this wrinkle, a rolling phenomenon may occur in the voice coil 25. The
reinforcing portion 24E has a shape that extends and contracts in the circumferential direction.
Specifically, the reinforcing portion 24E includes a top, and the bending or bending movement of
the reinforcing portion 24E at the top extends or contracts its shape. The bending motion or the
bending motion of the reinforcing portion 24E can suppress the formation of wrinkles at the
corners of the edge 22. In addition, the occurrence of the rolling phenomenon of the voice coil
25 can be suppressed.
[0040]
Generally, in order to make the speaker apparatus thinner or smaller, it is conceivable to make
the diaphragm and the magnetic circuit close to each other for thinning, or to make the frame
closer to the magnetic circuit to make smaller. At this time, since the concave edge is disposed
close to the yoke of the magnetic circuit, there is a possibility that the edge may come in contact
with the yoke when the diaphragm vibrates. In addition, noise may occur due to such contact.
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[0041]
The speaker device 1 has the above-described structure, so that the edge 22 does not easily
contact the second magnetic pole portion 32 (yoke 33) which is a component of the magnetic
circuit 30 when the vibrating body 21 vibrates. Therefore, even if the speaker device 1 is made
thinner by bringing the vibrating body 21 close to the magnetic circuit 30, it is possible to
suppress the contact between the edge 22 and the yoke 33 and the generation of abnormal noise
due to the contact. become.
[0042]
That is, the speaker device 1 suppresses the contact between the edge 22 and the yoke 33, and
at the same time, outside the connection position between the vibrating body 21 having rigidity
and the voice coil 25 in order to make the speaker device 1 thinner or smaller. And an outer
peripheral portion 21A of the vibrator 21 disposed in the vicinity of the second magnetic pole
portion 32. Further, the speaker device 1 includes the first curved portion 23 which is a convex
curved portion, and the second curved portion 24 which is a concave curved portion, which is
disposed outside the first curved portion 23. The edge 22 is provided. Since the speaker device 1
includes such a vibration unit 20, the speaker device 1 can be miniaturized and thinned, and the
edge 22 can be in contact with the yoke 33 and generation of abnormal noise due to the contact
can be suppressed. can do.
[0043]
Although the illustrated edge 22 has the inner peripheral portion 22A, the present invention is
not limited to this and the edge 22 may have only the outer peripheral portion 22B. Specifically,
the edge 22 and the vibrator 21 may be integrally formed. Alternatively, the vibrating body 21
may have a two-layer structure of an elastic member integrally formed with the edge 22 and a
rigid member. In this case, the elastic member is disposed on the magnetic circuit 30 side with
respect to the rigid member, in comparison with the case where the elastic member is disposed
on the acoustic radiation side with respect to the rigid member. The speaker device 1 can be
thinned.
[0044]
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15
The top portion 23C of the first curved portion 23 is provided in the vicinity of the outer
peripheral portion 21A of the rigid vibrating body 21 so that part of the first curved portion 23
vibrates even while the vibrating body 21 is vibrating. The height substantially the same as that
of the body 21 can be maintained, and the contact with the second magnetic pole portion 32 can
be suppressed. Further, since the distance between the first curved portion 23 and the second
curved portion 24 can be made relatively large, the amplitude of the vibrating body 21 can be
made relatively large.
[0045]
As the speaker apparatus is miniaturized, there is a problem that the effective vibration area of
the vibrating body is also reduced. By arranging the outer peripheral portion 21A of the vibrator
21 outside the voice coil 25 and further extending to the vicinity of the top 23C of the first
curved portion 23, a relatively large effective area of the vibrator 21 can be obtained. . In
addition, while making the radius of curvature R1 of the first curved portion 23 relatively small
(while maintaining the rigidity), the top portion 23C is located at a distance from the outer
peripheral portion 21A of the vibrating body 21 and substantially with the vibrating body 21. By
arranging them at the same height, a part of the first bending portion 23 can be made a part of
the vibrating body 21. In this case, the effective vibration area of the speaker device 1 can be
made relatively large.
[0046]
Not limited to the above description, the inner circumferential portion 22A of the edge 22 can be
made higher than the outer circumferential portion 22B of the edge 22. In this case, the distance
between the edge 22 and the second magnetic pole portion 32 can be increased, the contact
between the both can be suppressed, and the amplitude of the vibrating body 21 can be
relatively increased.
[0047]
By arranging the top 24C of the second curved portion 24 outside the second magnetic pole
portion 32, the distance between the first curved portion 23 and the second magnetic pole
11-05-2019
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portion 32 can be made relatively large. Also in this case, the contact between the edge 22 and
the second magnetic pole portion 32 can be suppressed. Further, since the distance between the
first curved portion 23 and the second magnetic pole portion 32 can be made relatively large,
the contact between the first curved portion 23 and the second magnetic pole portion 32 can be
suppressed.
[0048]
The vibrating body 21 includes a rigid vibrating member 21B having rigidity, and the rigid
vibrating member 21B includes carbon as a component. The rigid vibration member 21B has a
foam layer 21C having a foam structure and a cover layer 21D covering the foam layer 21C, as
shown in FIG.
[0049]
The edge 22 is made of a resin member. The vibrating body 21 having the rigid vibrating
member 21B has substantially the same shape as that of the rigid vibrating portion 21B in the
illustrated example, is made of polyetherimide, and has a density of about 1.27 g / cm 3. It has a
small density and a large rigidity with respect to a comparative vibrator having a Young's
modulus of about 4 MPa. Further, the thickness of the vibrator 21 is formed smaller than the
entire height of the edge 22.
[0050]
The size obtained by dividing the Young's modulus in the vibrating body 21 by the density is
larger than the size obtained by dividing the Young's modulus in the comparative vibrating body
described above by the density. In addition, the rigid vibration member 21B substantially
composed only of carbon has a density of about 0.5 g / cm 3, a Young's modulus of about 7 GPa,
a bending strength of about 25 MPa, and a thickness of about 0. It is .3 mm.
[0051]
By forming the vibrating body 21 with a member containing carbon as a main component, it can
11-05-2019
17
be made lightweight and thin. In addition, the above-described comparative vibrator made of the
resin member constituting the edge 22 is lightweight and has high rigidity. In the illustrated
example, the rigid vibration member 21B has a foam layer 21C having a foam structure, and two
covering layers 21D covering the front and back surfaces of the foam layer 21C. The covering
layer 21D forms a substantially continuous surface. Therefore, by providing the covering layer
21D on the surface of the foam layer 21C, sound waves propagating from the back side (the
magnetic circuit 30 side) of the vibrating body 21 pass through the vibrating body 21 and are
emitted in the acoustic radiation direction. Can be suppressed, and acoustic characteristics can be
improved.
[0052]
[Structure of Magnetic Circuit] As shown in FIG. 3, the magnetic circuit 30 includes a yoke 33, a
magnet 35 supported by the yoke 33 and a plate 34, and the yoke 33 is a bottom surface
magnetically coupled to the magnet 35. It comprises a portion 33A and a wall portion 33B
erected from the bottom portion 33A. A magnetic gap 30G is disposed between the plate 34 as
the first magnetic pole portion 31 and the wall 33B of the yoke 33 as the second magnetic pole
portion 32. In the illustrated example, the bottom portion 33A of the yoke 33 has a flat plate
shape.
[0053]
Further, as shown in FIG. 6 which is a cross-sectional view taken along line X1-X1 of FIG. 3, the
magnetic circuit 30 includes a yoke 33, an inner magnet 35A supported by the yoke 33, an outer
magnet 35B, and one or more plates 34. Have. The yoke 33 includes a bottom portion 33A
magnetically coupled to the magnet 35, the inner magnet 35A is disposed inside the voice coil
25, the outer magnet 35B is disposed outside the voice coil 25, and the plate 34 is The first pole
portion 31 is the plate 34 or the inner magnet 35A, and the second pole portion 32 is the plate
or the outer magnet 35B on the outer magnet 35B, which is disposed on one of the magnet 35A
or the outer magnet 35B. In the illustrated example, the plate 34 is the first magnetic pole
portion 31, and the outer magnet 35 B is the second magnetic pole portion 32.
[0054]
FIG. 7 shows the entire configuration of the magnetic circuit (FIG. 7 (a) is a plan view, and FIG. 7
11-05-2019
18
(b) is a perspective view). As shown in FIG. 7, a plurality of (pairs of) outer magnets (the other
magnets) 35 </ b> B are disposed at opposing positions across the inner magnet (one of the
magnets) 35 </ b> A. Further, the yoke 33 is provided with a plurality of opposing wall portions
33B. The outer magnet (the other magnet) 35B is disposed between the wall 33B of the yoke 33
in the circumferential direction, and each outer magnet 35B is disposed magnetically coupled to
the bottom 33A of the yoke 33. There is.
[0055]
The orientation of the magnet 35 is formed along the thickness direction of the magnet 35.
However, as an example, as shown in FIG. 8, the orientation of the magnet 35 may be formed
obliquely with respect to the thickness direction. Here, in the magnet 35A (35B) of the inner
magnet 35A or the outer magnet 35B, the orientation direction of the magnet 35A (35B) is along
the thickness direction of the magnet 35A (35B), and the other magnet 35B In (35A), the
orientation of the orientation of the magnet 35B (35A) is oblique to the thickness direction of the
magnet 35B (35A). In the illustrated example, the outer magnet 35B is oriented obliquely to the
thickness direction, but the orientation of the outer magnet 35B is in the thickness direction, and
the orientation of the inner magnet 35A is inclined to the thickness direction. May be When the
orientation of the inner magnet 35A is oblique, for example, a plurality of rod-shaped inner
magnets 35A are annularly disposed on the yoke 33. Further, the orientations of the inner
magnet 35A and the outer magnet 35B may be oblique to the thickness direction. In this case, a
plurality of rod-like inner magnets 35A and a rod-like plurality of outer magnets 35B are
annularly disposed on the yoke 33. Further, the orientation of the inner magnet 35A and the
outer magnet 35B may be formed along the thickness direction. In that case, the inner plate is
placed on the inner magnet 35A, and the outer plate is placed on the outer magnet 35B. In any
case, the orientations of the orientations of the respective magnets of the inner magnet 35A and
the outer magnet 35B are substantially constant in the thickness direction of the magnet. That is,
the direction of orientation does not change substantially in the thickness direction of the
magnet. Further, in the illustrated example, the orientation of the orientation of the outer magnet
35B is a direction toward the lower right, but is not limited thereto. For example, when the
orientation of the inner magnet 35A is downward along the thickness direction, the orientation of
the orientation of the outer magnet 35B is diagonally upward left. As described above, the
orientation of the magnet 35 can be appropriately changed so that the magnetic flux emitted
from the magnet 35 passes through the magnet 35 and the yoke 33 to form a magnetic loop
(closed circuit).
[0056]
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19
At this time, the magnetic flux emitted by the outer magnet (the other magnet) 35B passes
through the position away from the yoke 33, and the magnetic gap 30G is formed in the vicinity
of the position where the magnetic flux passes. That is, the magnetic gap 30G is a position
through which magnetic flux passes, and is located on a part of the yoke 33 different from the
position of the outer magnet (the other magnet) 35B as the magnetic pole portion and the outer
magnet (the other magnet) 35B. And the magnetic pole portion (plate 34) provided on the
[0057]
In the illustrated example, the magnetic circuit 30 includes the inner magnet 35A, the outer
magnet 35B, the yoke 33, and the plate 34. However, even if the wall 33B of the yoke 33 is
disposed instead of the outer magnet 35B. I do not care.
[0058]
When driving the speaker device 1, an audio signal is input to the voice coil 25.
Joule heat is generated in the voice coil 25 in response to the input of the voice signal. The Joule
heat may increase the temperature in the magnetic circuit 30. In general, high temperature
demagnetization problems may occur as the temperature in the magnetic circuit increases.
[0059]
In addition, when Joule heat is not sufficiently radiated from the voice coil 25 as radiant heat, the
temperatures of the voice coil 25 and the lead wire 26 may be relatively large. Generally, when
the temperature of the voice coil or the lead wire becomes relatively high, there may occur a
problem that they are broken.
[0060]
Furthermore, by repeatedly driving the speaker device 1, the voice coil 25 and the lead wire 26
may be in a high temperature state or a normal temperature state. Further, in an environment
where the speaker device 1 is used, the voice coil 25 or the lead wire 26 may be in a low
11-05-2019
20
temperature state. By repeating such a high temperature state and normal temperature state or a
cycle of high temperature state and low temperature state, a load generally acts on the voice coil
or the lead wire, and there is a concern that a break may occur in these.
[0061]
In the embodiment of the present invention, heat of the voice coil 25 or the lead wire 26 can be
dissipated by propagating it to the component of the magnetic circuit 30 or the frame 11 as the
stationary portion 10, and the high temperature demagnetization described above In some cases,
it can contribute to the solution of the problem of disconnection. As the heat propagation path,
for example, a propagation path in which the voice coil 25 (including the lead wire 26), the plate
34, the magnets 35A and 35B, the yoke 33, and the frame 11 are in the order listed.
Furthermore, a propagation path propagating from the wall of the yoke 33 to the frame 11 is
also conceivable. The heat propagation path is not limited to this, and the heat is transmitted to
the component of the magnetic circuit 30 disposed in the vicinity of the voice coil 25 or the lead
wire 26, the component of the vibration unit 20, other components, and the outside. A
propagating path is also conceivable.
[0062]
Further, since the magnet has a relatively large heat capacity, it can contribute to efficiently
propagating the heat of the voice coil 25 and the lead wire 26. In particular, the magnetic circuit
30, which is a combined type in which the magnetic circuit 30 uses both the internal magnet
type and the external magnet type, includes an outer magnet with respect to the internal magnet
type magnetic circuit. For this reason, the magnetic circuit of the combined type is larger in the
number of magnets than the magnetic circuit of the inner magnet type, and larger in the surface
area of the magnet. At this time, the heat capacity of the entire magnetic circuit 30 may be
relatively large, and the heat of the voice coil 25 or the lead wire 26 may be released more.
[0063]
When the magnetic circuit 30 is an external magnet type or a combination type, the outer
diameter of the yoke 33 may be larger than that of the internal magnetic type magnetic circuit.
At this time, the heat capacity of the entire magnetic circuit 30 may be relatively large, and the
heat dissipation of the voice coil 25 or the lead wire 26 may contribute significantly.
11-05-2019
21
[0064]
In the example shown in FIG. 7, the outer magnet (the other magnet) 35B has a shape (long
rectangular shape in one direction) defined by the major axis and the minor axis. Moreover, the
orientation discrimination | determination part 36 formed of notch 35 B1 is provided in the
outer side magnet (other magnet) 35B. The orientation determination unit 36 (the notch 35B1) is
provided to clearly indicate the orientation direction formed obliquely with respect to the
thickness direction. Here, the surface on which the notch 35B1 is not formed is directed to the
magnetic gap 30G side. Further, by arranging the surface on which the notch 35B1 is formed on
the side of the wall 33B of the yoke 33 and outside the yoke 33, the orientation of the magnet
can be arranged along an appropriate direction.
[0065]
When the outer magnets (the other magnets) 35B and 35B having substantially the same outer
shape are used, there is a problem that it is not possible to identify the orientation of the
magnets. Therefore, in order to identify the orientation of the orientation of the magnet and place
the other magnet at an appropriate position, an orientation determination unit 36 is provided
that determines the orientation of the orientation. As described above, the orientation
determination unit 36 can be formed by the notch 35B1 or the like provided in the magnet 35.
However, the orientation determination unit 36 can also be formed by providing a display such
as an arrow on the surface of the magnet.
[0066]
In the magnet 35 in the magnetic circuit 30 of the speaker device 1, as described above, the
orientation of the first magnet (one of the inner magnet 35A and the outer magnet 35B) is in the
thickness direction, and the second magnet (the outer magnet 35B) And the orientation of either
of the inner magnets 35A) is oblique to the thickness direction. The magnetization direction may
be along the orientation of the orientation of the magnet, or may be different from the
orientation of the orientation of the magnet. By using a magnet whose orientation is oblique, it is
possible to suppress the occurrence of magnetic leakage (the magnetic flux does not pass to the
lower yoke 33 and does not pass in the magnetic gap 30G), and the magnetic flux density in the
magnetic gap 30G is relatively large. it can. In addition, the peak position of the magnetic flux
11-05-2019
22
density in the magnetic gap 30G can be set at a relatively high position at a position distant from
the yoke 33. Therefore, even if the magnetic circuit 30G is thinned, the magnetic circuit 30
having a relatively high magnetic flux density can be used, and the electromagnetic force acting
on the voice coil 25 can be relatively increased.
[0067]
In addition to the orientation determination unit 36, when using a magnet whose orientation is
oblique, it is difficult to distinguish both at the time of production if a magnet whose orientation
is in the thickness direction is also used at the same time. In addition, it takes an unnecessary
time to confirm which direction of the magnet is an oblique direction. Therefore, for example,
when using a magnet whose orientation is oblique as the second magnet (the outer magnet 35B),
a notch 35B1 is provided on the end face of the second magnet (the outer magnet 35B), and a
mark for determining the type of magnet And
[0068]
[Mounting Structure of Magnetic Circuit] FIGS. 9 to 11 show a mounting structure for mounting
the magnetic circuit to the stationary portion. 9 is a plan perspective view of a state where the
magnetic circuit is attached in the stationary part, FIG. 10 (a) is a cross-sectional view along X2X2 in FIG. 9, FIG. Each has shown the back perspective view in the state which attached the
magnetic circuit in the stationary part. The speaker device 1 includes a frame 11 as the
stationary unit 10. The frame 11 includes an outer peripheral cylindrical portion 11A to which
the yoke 33 of the magnetic circuit 30 is attached, and a bottom portion 11B having an opening
11B1.
[0069]
The outer peripheral cylindrical portion 11A of the frame 11 is provided with one or more
recessed portions 11A2 at its lower end portion 11A1. Further, the yoke 33 is provided with a
projecting portion 33C which protrudes in a direction from the bottom surface portion 33A
toward the frame 11. A part of the yoke 33 is disposed in the opening 11B1 of the frame 11, the
protrusion 33C of the yoke 33 is disposed in the recess 11A2 of the frame 11, and the yoke 33
and the frame 11 are attached. The lower surface 33E of the yoke 33 is disposed at a position on
the vibrating body 21 side or substantially the same position with respect to the lower surface
11-05-2019
23
11C of the frame 11. The frame 11 can be formed of a resin member or the like.
[0070]
Between the frame 11 and the outer magnet 35 </ b> B, a bonding member storage portion 51
for storing a bonding member 50 for bonding the frame 11 and the outer magnet 35 </ b> B is
provided. The bonding member storage portion 51 is provided with a predetermined gap 52. The
gap 52 is configured by a first gap provided between the protrusion 11E of the frame 11 and the
outer magnet 35B, and a second gap provided between the inner side surface 11D of the frame
11 and the outer magnet 35B. Be done. The frame 11 has an inner side surface 11D as a side
surface facing the outer magnet. The protrusion 11E that constitutes the first gap protrudes
inward from the inner side surface 11D of the frame 11 facing the outer magnet 35B, and is
provided on the outer magnet 35B. The second gap is disposed on the yoke 33 side with respect
to the first gap, and has a width larger than the width of the first gap in the radial direction. The
gap 52 is filled with a bonding member 50 for bonding the frame 11 and the outer magnet 35B.
[0071]
A passage 37 is provided between the magnetic circuit 30 and the frame 11 on the lower surface
side of the outer magnet 35B. The passage 37 communicates the gap 52 provided between the
frame 11 and the outer magnet 35B with the outside.
[0072]
In an electronic device or the like on which the speaker device 1 is mounted, the space inside the
device is limited. The rear side of the speaker device 1 is provided with an external terminal of an
electronic device that is in electrical contact with the terminal portion 12 of the speaker device 1.
Here, as a component of the magnetic circuit 30, for example, the case where the yoke 33
protrudes toward the electronic device with respect to the frame 11 is assumed. In addition, the
yoke 33 is comprised by the member which has electroconductivity, and the flame | frame 11 is
comprised with insulating members, such as resin. In this case, electrical contact may occur
between the conductive yoke 33 and the external terminal, which may cause a problem of
malfunction of the electronic device. In particular, since the speaker device for a portable
telephone is relatively small, when the tolerance of the shape of the yoke 33 is large, a part of the
yoke 33 from the frame 11 may be protruded. Therefore, by providing the recess 11A2 in the
11-05-2019
24
frame 11 and arranging the protrusion 33C of the yoke 33 in the recess 11A2, it is possible to
prevent the yoke 33 from partially protruding. Thereby, the speaker device 1 can be disposed in
a predetermined space, and the electronic device can be thinned while avoiding contact between
the yoke 33 and the external terminal.
[0073]
More specifically, the recess 11A2 of the frame 11 is a positioning portion that determines the
position of the yoke 33 with respect to the frame 11 in the radial direction. The position of the
yoke 33 can be substantially determined by the recess 11A2 of the frame 11. In addition, when
thinning the speaker device 1, it is possible to suppress that a part of the yoke 33 caused by the
tolerance of the shape of the yoke 33 or the like protrudes. In addition, it is possible to suppress
the operation failure of the electronic device that occurs when a part of the yoke 33 is in
electrical contact with the external terminal. In addition, even when the other constituent
members constituting the magnetic circuit 30 protrude with respect to the frame 11, electrical
contact with the external terminal portion can be suppressed.
[0074]
In the radial direction of the magnetic circuit 30 (direction intersecting the vibration direction of
the voice coil 25), for example, the position of the outer magnet 35B may be positionally adjusted
in the radial direction in order to make the magnetic gap 30G have a prescribed width. . If the
outer magnet 35B has a width larger than the desired width (having a tolerance), the outer
magnet 35B can not be installed in the frame 11 if the width of the magnetic gap 30G is
prioritized. In order to solve this, a predetermined gap 52 is provided between the frame 11 and
the outer magnet 35B. Within this gap 52, a portion of the outer magnet 35B is disposed, the
width of which is substantially the same as the tolerance. Thus, the magnetic gap 30G can be
made to have a prescribed width. Also, the outer magnet 35 B can be disposed in the frame 11.
[0075]
In order to bond the frame 11 and the outer magnet 35 B, the bonding member 50 is filled in the
gap 52. On the inner side surface 11D of the frame 11, a protrusion 11E is provided. When the
bonding member 50 is filled, the protrusion 11E can prevent the bonding member 50 from
leaking above the outer magnet 35B. Further, a predetermined gap which is a passage 37
11-05-2019
25
communicating with the outside is provided between the frame 11 and the yoke 33. An injector
(dispenser) for injecting the joint member 50 can be inserted into the passage 37. Further, the
joining member 50 can be filled between the frame 11 and the outer magnet 35B.
[0076]
The frame 11 is provided with a bottom surface portion 11B in contact with the bottom surface
portion 33A of the yoke 33, and an outer peripheral cylindrical portion 11A surrounding the
magnetic circuit 30 and supporting the edge 22. A gap 52 is provided between the outer
peripheral cylindrical portion 11A of the frame 11 and the second magnet (the outer magnet
35B). The bonding member 50 is filled in the gap 52, and the frame 11 and the second magnet
(outer magnet 35B) are bonded. In addition, the gap 52 provides a predetermined gap from the
outer peripheral side surface of the second magnet (the outer magnet 35B) to the frame 11 side,
and the second magnet (the outer magnet 35B) corresponds to the size (tolerance) of the
magnets. And the magnetic circuit 30 can be attached.
[0077]
For example, the dimensions of the speaker device 1 mounted on the mobile phone are
predetermined. In addition, in order to satisfy the requirements such as to fit in the prescribed
size and to make the electromagnetic force of the voice coil 25 relatively large, the speaker
device 1 needs to effectively utilize the prescribed size. Further, the positions of the respective
constituent members in the speaker device 1 are defined with relatively high accuracy so as to
have a prescribed size. Therefore, when there are a plurality of component members and there is
a tolerance of the component members, if the position of the component members deviates, the
component members can not be arranged at the specified positions, or the speaker device
exceeds the specified dimensions. There is. Therefore, in order to reduce the displacement due to
the tolerance of the component members, the recess 11A2 is provided in the outer peripheral
cylindrical portion 11A of the frame 11 facing the yoke 33, and the protrusion 33C of the bottom
33A of the yoke 33 is disposed in the recess 11A2. At this time, a part of the yoke 33
corresponding to the tolerance is disposed in the recess 11A2 of the frame 11. With such an
arrangement, the displacement due to the tolerance of the component members can be reduced,
and the speaker device 1 can be thinned. Therefore, it becomes possible to arrange other
component members in a prescribed position and to make the speaker device 1 into a prescribed
size.
11-05-2019
26
[0078]
12 (a) and 12 (b) are explanatory views showing another example of the mounting structure of
the magnetic circuit. In the example of FIG. 6A, the first magnetic pole portion 31 is formed of
the inner plate 34A, the second magnetic pole portion 32 is formed of the outer plate 34B, and
the magnetic gap 30G is formed therebetween. Then, when the magnetic circuit 30 is attached to
the stationary portion 10, the upper surface of the outer plate 34B is made to abut on a fixing
surface 11E1 formed on the lower surface of the projecting portion 11E of the frame 11. Further,
in the example of FIG. 6B, the magnetic circuit 30 is attached to the stationary unit 10 by
bringing the upper surface of the yoke 33 into contact with the fixed surface formed on the
bottom surface 11B of the frame 11. Also, in the example of FIG. 12A, the inner magnet 35A and
the outer magnet 35B have substantially the same thickness. Further, the thickness of the outer
plate 34B is larger than the thickness of the inner side plate 34A. This allows the outer plate 34B
to have a relatively large gap between it and the edge 22 located above it. Further, in FIG. 12A,
the orientation of the inner magnet 35A and the outer magnet 35B may be in the direction along
the thickness direction. In this case, the magnetic gap 30G is substantially formed by the inner
plate 34A and the outer plate 34B. Further, in FIG. 12B, the orientation of the outer magnet 35B
may be oblique to the thickness direction, and the orientation of the inner magnet 35A may be a
direction along the thickness direction. In this case, the magnetic gap 30G is substantially formed
by the inner plate 34 and the outer magnet 35B.
[0079]
[Arrangement of Lead Wire and Suppression of Breakage] FIG. 4 shows a cross-sectional view of
the voice coil 25 and the lead wire 26. A lead wire 26 drawn from the lower end 25A of the voice
coil 25 and a plurality of terminal portions 12 electrically connecting the voice coil 25 to the
outside through the lead wire 26 are provided. The terminal portion 12 is provided on the frame
11. The yoke 33 includes a plurality of wall portions 33B erected from the bottom surface
portion 33A, and a cutout portion 33F provided between the adjacent wall portions 33B. The
lead wire 26 of the voice coil 25 passes through the notch 33F, passes through the lead passage
38 provided between the wall 33B of the yoke 33 and the inner side surface 11D of the frame 11
facing the wall 33B, It is connected to the terminal unit 12.
[0080]
As shown in FIG. 9, the plurality of terminal portions 12 provided in the frame 11 are disposed
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on the side of one of the two regions 25N1 and 25N2 divided by the major axis 25L of the voice
coil 25. . In the illustrated example, a plurality of leader lines 26 are provided. Further, the
drawing position of the lead wire 26 drawn from the voice coil 25 is disposed on the other area
25N2 side.
[0081]
That is, the second magnet (outer magnet 35 B) is disposed on the yoke 33 outside the voice coil
25. From the lower end 25A of the voice coil 25, a lead wire 26 is drawn. The lead wire 26 is
routed toward the plurality of terminal portions 12 disposed on one side of the two regions
divided by the long axis 25L passing through the central position of the voice coil 25. The
drawing-out position of the lead-out wire 26 is substantially drawn out from the vicinity of the
corner of the voice coil 25, specifically, of the plurality of curved portions and straight portions
of the voice coil 25. At the bottom surface portion 33B of the yoke 33 corresponding to the leadout position of the lead-out wire 26, a retracting portion 40 for retracting the lead-out wire 26 is
provided. The retracting portion 40 has a concave cross section. The yoke 33 includes a plurality
of wall portions 33B, and a notch 33F is provided in the yoke 33 between the adjacent wall
portions 33B. Between the notch 33F, the wall 33B of the yoke 33, and the inner side surface
11D of the frame 11, a lead-out passage 38 for drawing the lead 26 is formed. A part of the end
portion side of the lead wire 26 is electrically connected to the terminal portion 12 and
externally inputs an audio signal to the voice coil.
[0082]
The lead wire 26 of the voice coil 25 has a lead portion 26A which is drawn across the end face
of the voice coil 25 on the side opposite to the vibrating body 21 (see FIG. 4). The magnetic
circuit 30 has a bottom surface portion 33A facing the end surface of the voice coil 25 disposed
in the magnetic gap 30G, and the bottom surface portion 33A abuts on the bottom surface
portion 33A the lower end surface 25A of the voice coil 25 or A retreating portion 40 is formed,
which retracts the lead-out portion 26A when it approaches. That is, the yoke 33 (stationary
portion 10) facing the lower end 25A of the voice coil 25 is provided with a withdrawal portion
40 for withdrawal of the lead portion 26A of the lead wire 26 drawn from the voice coil 25 (FIG.
4 and FIG. 9). The retracting portion 40 in which the lead-out portion 26A retracts is provided in
order to prevent the lead wire 26 from being disconnected due to the voice coil 25 and the yoke
33 coming into contact with each other by an external impact. The retracting portion 40 has a
concave shape in cross section.
11-05-2019
28
[0083]
[Structure of Terminal Portion] FIGS. 13 to 15 are explanatory views showing the structure of the
terminal portion. FIG. 15 is a perspective view of a part of the outer peripheral cylindrical portion
11A of the frame 11 as viewed from the magnetic circuit 30 side. The terminal portion 12
includes a first contact portion 12A in contact with an external terminal portion, an elastic
support portion 13 elastically supporting the first contact portion 12A with respect to the frame
11, and a lead wire 26 of the voice coil 25. And the second contact portion 12 B electrically
connected to the frame 11, and the frame 11 includes the fixing portion 14 for fixing the
terminal portion 12.
[0084]
The outer peripheral cylindrical portion 11A of the frame 11 includes a locked portion 11A3 to
which the end 12C of the first contact portion 12A is hooked, and the locked portion 11A3 is
located below the frame 11 in the first contact portion 12A. It is regulated to move to The end
12C of the first contact portion 12A is locked to the locked portion 11A3. The end 12C of the
first contact portion includes a locking portion 12D that locks to the locked portion 11A3. The
locking portion 12D has a shape that protrudes from the end 12C of the first contact portion 12A
toward the locked portion 11A3. In addition, the locking portion 12D of the first contact portion
12A extends in a direction intersecting the direction in which the first contact portion 12A
extends.
[0085]
The outer circumferential cylindrical portion 11A of the frame 11 includes a housing portion
11A4 for housing the terminal portion 12. The housing portion 11A4 is a recess formed in the
outer side surface 11A5 of the outer circumferential cylindrical portion 11A of the frame 11. The
outer peripheral cylindrical portion 11A of the frame 11 includes a movement space 11A6 in
which the first contact portion 12A moves along the vibration direction of the voice coil 25.
[0086]
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29
The locked portion 11A3 provided in the outer peripheral cylindrical portion 11A of the frame
11 can restrict the movement of the first contact portion 12A below the frame 11 (on the side of
the casing of the mobile phone). On the other hand, the movement of the first contact portion
12A causes the elastic support portion 13 to repeat a bending movement, resulting in a problem
that the elastic force is reduced. In particular, when the movement width of the first contact
portion 12A is large, the decrease in elastic force may be larger. Therefore, the elastic force of
the elastic support portion 13 can be maintained for a long time by providing the engaged
portion 11A3 and limiting the movement width of the first contact portion 12A.
[0087]
By arranging the terminal portion 12 in the outer peripheral cylindrical portion 11A of the frame
11, the speaker device 1 can be made to have a prescribed size and can be miniaturized. The
outer peripheral cylindrical portion 11A of the frame 11 is provided with a moving space
(opening) for the first contact portion 12A to move along the vibration direction of the voice coil
25. Therefore, even when the external terminal portion approaches the first contact portion 12A,
the first contact portion 12A can maintain good contact with the external terminal portion while
moving. Further, when the external terminal part is separated from the first contact part 12A, the
contact state is separated, and a predetermined part between the external terminal part and the
first contact part 12A is formed by the engaged part 11A3. Maintain the distance of
[0088]
For example, the terminal unit 12 of the speaker device 1 may be electrically connected to a
terminal unit (external terminal unit) of the mobile phone. In this case, the terminal portion 12
also includes the first contact portion 12A, the elastic support portion 13, the second contact
portion 12B, and the fixing portion 14 as described above. The first contact portion 12A contacts
an external terminal portion. Further, the elastic support portion 13 elastically supports the first
contact portion 12A with respect to the frame 11. The second contact portion 12B is electrically
connected to the lead wire 26 of the voice coil 25. The fixing portion 14 fixes the terminal
portion 12 to the frame 11. The end of the first contact portion 12A is provided with a locking
portion 12D which is fixed to the frame 11. The locking portion 12D restricts the movement of
the first contact portion 12A below the frame 11 (on the side of the housing of the mobile
phone). In addition, the locking portion 12D maintains the elasticity of the curved elastic support
portion 13 for a long time. The frame 11 is provided with a housing portion for housing the
terminal portion 12 on the outer side surface 11A5 of the outer peripheral cylindrical portion
11A in order to store the speaker device 1 in a prescribed size. The frame 11 includes a
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movement space 11A6 (opening) for the first contact portion 12A to move along the thickness
direction of the speaker device 1. The movement space 11A6 is provided with an opening 11A7
inside the outer peripheral cylindrical portion 11A of the frame 11. The opening 11A7 is
provided at a position adjacent to the engaged portion 113, and the locking portion 11D and a
part of the first contact portion 12A move in the opening 11A7. The terminal portion 12 is
attached to the frame 11 by the fixing portion 14.
[0089]
[Embodiment of Speaker Device] FIGS. 16 and 17 are external perspective views showing the
overall configuration of the speaker device 1. As shown in FIG. 16, the edge 22 has a shape
defined by the major axis 22L1 and the minor axis 22L2, that is, a rectangular outer shape
elongated in one direction. The edge 22 has the first curved portion 23 and the second curved
portion 24 as described above, and thus has a convex cross-sectional shape on the opposite side
to the acoustic radiation direction. The edge 22 is provided at its corners with one or more
protrusions 24E. The protrusion 24E has a convex cross section on the acoustic radiation side, or
has a convex cross sectional shape on the side opposite to the acoustic radiation side. The
protrusions 24E extend in the radial direction of the edge 22. The outer periphery of the
projection 24E is located inside the outer periphery 22B (see FIG. 5) of the edge 22, and the
inner periphery is located inside the inner periphery 22A (see FIG. 5) of the edge 22. The inner
circumferential portion 22A of the edge 22 supports the vibrating body 21.
[0090]
The speaker device 1 includes a frame 11 as the stationary unit 10, a vibrating unit 20, a
magnetic circuit 30, and a protecting unit 60 that protects the vibrating body 21. The vibrating
portion 20 has a vibrating body 21 and an edge 22 for supporting the vibrating body 21 on a
frame. The external shape of the speaker device 1 may be circular, oval, track-like, etc. regardless
of the rectangular shape.
[0091]
The protective portion 60 covers a part of the edge 22, and the opening 61 exposes the vibrating
body 21. The edge 22 supports the vibrating body 21 to the frame 11 at its inner peripheral
portion 22A. A magnetic circuit 30 supported by the frame 11 is disposed on the back side of the
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vibrating body 21. The voice coil 25 is supported by the vibrating body 21 via the inner
circumferential portion 22A of the edge 22. The vibrating body 21 is formed of a material
containing carbon as a main component, and has electrical conductivity. The voice coil 25 needs
to be attached to the vibrator 21 through the edge 22 made of an insulating material (such as
resin). The magnetic circuit 30 includes a plate 34, a yoke 33, and a magnet 35. The yoke 33 has
a bottom surface 33A and a wall 33B erected from the bottom surface 33A.
[0092]
As an example, the magnetic circuit 30 employs an inner and outer magnetic type magnetic
circuit in which the magnets 35A and 35B are disposed on the inside and the outside of the voice
coil 25. A first space is provided on the front side (acoustic radiation side) of the vibrating body
21, and a second space is provided on the back side of the vibrating body 21.
[0093]
The position of the outer peripheral portion 21A of the vibrating body 21 is disposed in the
vicinity of the position of the wall portion 33B of the yoke 33 in the direction intersecting with
the vibration direction of the voice coil 25. Further, the inner peripheral portion 22A of the edge
22 is also disposed near the position of the wall 33B of the yoke 33. Under the present
circumstances, since the vibrating body 21 has bending rigidity, when the vibrating body 21
vibrates, it can suppress that the edge 22 contacts the wall part 33B of the yoke 33, and the
inside of the 1st curved part 23 which the edge 22 has. The position of the circumferential
portion 23A or the inner circumferential portion 24A of the second curved portion 24 can be
disposed on the vicinity of the position of the wall 33B of the yoke 33.
[0094]
Such a speaker device 1 can be used for electronic devices and vehicles. FIG. 18 is an explanatory
view showing an application example of the speaker device 1 according to the embodiment of the
present invention. For example, the speaker device 1 can be housed in a housing as an attached
member provided in an electronic device 100 such as a mobile phone or a portable information
terminal as shown in FIG. 1A or an electronic device such as a flat panel display. In this case, the
thickness of the electronic device can be made relatively small.
11-05-2019
32
[0095]
Further, the speaker device 1 can be used for an automobile 200 as shown in FIG. In particular,
the speaker device according to the embodiment of the present invention can be attached to a
door panel, a ceiling, a rear tray, or a dashboard as a mounting member. In this case, the
thickness of the mounting member such as the door panel can be made relatively small, and the
riding space can be made relatively large.
[0096]
FIG. 19 is an explanatory view showing another example of the electronic device as an
application example of the speaker device 1 according to the embodiment of the present
invention. The electronic device 101 shown in FIG. 6A is a personal computer (portable type,
notebook type, laptop type or the like), and the electronic device 102 shown in FIG.
[0097]
The electronic device 101 includes a display unit 101A and an input operation unit 101B. The
input operation unit 101B is a housing that accommodates the speaker device 1. Both ends of the
display unit 101A and the input operation unit 101B are rotatably connected. In the illustrated
example, a plurality of speaker devices 1 are provided such that vibrators are disposed on the
operation surface of the input operation unit 101B. Further, the present invention is not limited
to the illustrated example, and the display device 101A may be a housing, and one or more
speaker devices 1 may be disposed on the side or the like.
[0098]
The electronic device 102 is provided with a pair of housings 102A and 102A for housing the
speaker device 1, and the arched connecting portion 102B connecting the housings 102A and
102A electrically connects the plurality of speaker devices 1 It is an accommodating part for
wiring which accommodates the wiring connected to.
[0099]
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33
20 to 22 are explanatory views showing an example of mounting the speaker device according to
the embodiment of the present invention to an electronic device.
FIG. 20 is an entire configuration diagram showing an example of mounting on the electronic
device 101 described above. In the example of illustration, multiple housings 110 which
accommodate the speaker apparatus 1 in the state which exposed the vibrating body 21 are
provided. A wiring housing portion 120 is provided between the housings 110 and 110. The
wiring housing portion 120 accommodates a wiring for electrically connecting the plurality of
speaker devices 1. The wiring accommodating portion 120 is provided with a terminal portion
121 for electrically connecting to the electronic device.
[0100]
Fig.21 (a) is an expansion perspective view of A1 part in FIG. 20, FIG.21 (b) is an expanded
sectional view of A2 part in FIG. In FIG. 21A, the speaker device 1 including the vibrating body
21 is housed in a housing 110, and the housing 110 is a frame (first stationary portion) that
supports the vibrating portion (the vibrating body 21 and the edge 22). And a cabinet 112
(second stationary unit) that constitutes an air chamber between the casing 110 and the vibrator
21. The frame 111 is provided with an outer peripheral cylindrical portion surrounding the
vibrating body 21. Further, on the outer peripheral side surface of the outer peripheral
cylindrical portion of the frame 111, an attaching portion 111A for attaching the frame 111 to
the housing 110 of the electronic device is provided. The cabinet 112 is disposed on the back
side of the frame 111 (the lower side of the magnetic circuit 30).
[0101]
In FIG. 21B, the speaker device 1 including the vibrating body 21 is housed in the housing 110,
and the housing 110 is a frame (first stationary portion) that supports the vibrating portion (the
vibrating body 21 and the edge 22). ) Is provided. In this example, the housing 110 includes a
cabinet 112 disposed on the back side of the frame 111. An air passage 111 </ b> S is provided
between the frame 111 and the yoke 33. In the illustrated example, a gap is provided between
the inner side surface of the outer peripheral cylindrical portion 113 of the frame 111 and the
outer peripheral side portion of the yoke 33. This gap is an air passage 111S that communicates
the space between the vibrator 21 and the magnetic circuit 30 and the space between the
magnetic circuit 30 and the cabinet 112. Further, the air chamber 112S in the cabinet 112 is in
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communication with the inside of the frame 111 through the air passage 111S. The air chamber
112 </ b> S is provided in the vicinity of the outer side of the edge 22 and on the back side of the
yoke 33 of the magnetic circuit 30.
[0102]
FIG. 22 is an explanatory view showing a housing of part A1 in FIG. 20, in which (a) is an
exploded perspective view and (b) is a rear view of the frame. The yoke 33 of the magnetic
circuit 30 is disposed on the frame 111 that supports the vibrating body 21 and the edge 22.
The notches 33F described above are formed at the four corners of the yoke. The notch 33F
corresponds to the air passage 111S. An air chamber 112S is provided on the side of the cabinet
112 attached to the back side of the frame 111. Further, the space in the frame 111 is in
communication with the air chamber 112S via the air passage 111S of the frame 111.
[0103]
In addition, the housing 110 includes the inclined surface portion 114 on the outer side of the
outer peripheral cylindrical portion 113. By providing the inclined surface portion 114, the space
between the housing 110 and the speaker device 1 can be made relatively large, and acoustic
characteristics can be improved. The electronic device 101 shown in FIG. 19 includes a sound
emitting unit (near the position of the speaker device 1 in FIG. 19) for emitting the sound wave
emitted from the speaker device 1 to the outside. The sound emitting unit is formed by providing
a plurality of holes in a part of the housing 110. Further, the sound emitting unit causes the
space between the housing 110 and the speaker device 1 to communicate with the outside.
Therefore, the electronic device 101 is provided with an air chamber (first air chamber) on the
back side of the vibrating body, and an air chamber (second air chamber) is provided on the front
side (acoustic radiation side) of the vibrating body. An acoustic type speaker device.
[0104]
Although the embodiments of the present invention have been described in detail with reference
to the drawings, the specific configuration is not limited to these embodiments, and changes in
design etc. within the scope of the present invention are not limited. Are included in the present
invention. The embodiments shown in the above-mentioned drawings can be combined with each
other unless there is any contradiction or problem in the purpose, configuration and the like.
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Further, the contents of the respective drawings may be independent embodiments, and the
embodiment of the present invention is not limited to one embodiment combining the respective
drawings.
[0105]
In addition, PCT / JP2009 / 051646 applied internationally on January 30, 2009, PCT / JP2007
/ 065007 filed internationally on July 31, 2007, PCT / JP2007 / 067752 filed internationally on
September 12, 2007, US patent application US 12/670819, with a domestic transition date to
the US of January 26, 2010, US patent application US 12/675079, with a domestic transition
date to the US on February 24, 2010, a domestic transition date with the European patent All the
contents described in the European patent application EP 07807159.4, of which on February 23,
2010 are incorporated into the present application.
[0106]
1: Speaker device, 10: stationary portion, 11: frame, 12: terminal portion, 20: vibrating portion,
21: vibrating body, 22: edge, 22a, 22b, 22c: resin layer, 25: voice coil, 26: withdrawal Wire, 30:
magnetic circuit, 31: first magnetic pole portion, 32: second magnetic pole portion, 33: yoke, 34:
plate, 30 G: magnetic gap, 35: magnet, 37: passage, 38: extraction passage, 39 Reference
numeral: bottom surface, 40: retraction portion, 50: bonding member, 51: bonding member
storage portion, 52: gap, 100, 101, 102: electronic device, 110: housing, 111: frame (first
stationary portion), 112 : Cabinet (second stationary part), 111 S: air passage, 112 S: air
chamber, 120: housing for wiring, 200: automobile
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