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JP2010045433

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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
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DESCRIPTION JP2010045433
An object of the present invention is to ensure sufficient joining force between a diaphragm and
a damper, reduce the sound pressure in the high region, and suppress generation of resonance
including split resonance. A disclosed speaker device includes a magnetic circuit 1, a frame 2,
and a vibrator 3. The frame 2 supports the magnetic circuit 1 and the vibrator 3. The vibrating
body 3 has a diaphragm 31, an edge 32, a voice coil support portion 33 around which a voice
coil 34 is wound, and a damper 35. The outer peripheral portion of the diaphragm 31 is disposed
lower than the inner peripheral portion. A projecting first protrusion 31 ca is formed on the
inner circumferential portion of the diaphragm 31. [Selected figure] Figure 1
Speaker apparatus and automobile
[0001]
The present invention particularly relates to a thin speaker device mounted in a limited space
such as a door of a car and a car equipped with the speaker device.
[0002]
The conventional speaker apparatus has an inverted cone type in which a substantially conical
shape having a central portion projecting forward is driven by a voice coil disposed in a magnetic
field and driven in response to an externally applied signal. is there.
In this speaker device, a damper for holding the voice coil is disposed only on the front side of
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the cone (for example, see Patent Document 1). Hereinafter, this technique is referred to as a first
conventional example. Further, there is a conventional speaker device in which a high cut
corrugation is provided on a diaphragm to which a voice coil is coupled (see, for example, Patent
Document 2). Hereinafter, this technique is referred to as a second conventional example.
[0003]
Japanese Patent Publication No. 58-5640 (claim, column 3, line 18 to column 4, line 24, FIG. 3)
Japanese Patent Publication No. 62-17438 (first page, left column, line 14 to 17) Row, Fig. 1)
[0004]
In the above-described first conventional example, when bonding the damper and the diaphragm
with an adhesive, the adhesive applied on the diaphragm flows downward and sufficiently
secures the bonding force between the diaphragm and the damper. There was a problem that it
was difficult.
Further, in the case of the speaker device according to the first conventional example described
above, there is a problem that the sound pressure in the high region is relatively large.
Furthermore, in the first and second conventional examples described above, there is a problem
that resonance including split resonance may occur in the vicinity of the outer peripheral portion
of the diaphragm joined to the edge.
[0005]
The present invention has been made in view of the above-described circumstances, and an
example of the problem is to solve the problems as described above, and a speaker device
capable of solving these problems and the speaker device The purpose is to provide a car
equipped with
[0006]
In order to solve the above-mentioned subject, a speaker device concerning the invention
according to claim 1 is a vibrating body which has a diaphragm, an edge, a voice coil support
part by which a voice coil was wound, and a damper, a magnetic circuit, and the abovementioned vibration. Body and a frame for supporting the magnetic circuit, wherein the
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diaphragm is disposed such that the outer peripheral portion is lower than the inner peripheral
portion, and a projection-like first projection is formed on the inner peripheral portion of the
diaphragm It is characterized by being done.
An automobile according to the invention of claim 24 is characterized by comprising the speaker
device according to claim 1.
[0007]
Hereinafter, the best mode for carrying out the present invention will be described with
reference to the drawings. 1 is a cross-sectional view showing the configuration of the speaker
device according to an embodiment of the present invention, FIG. 2 is a partially enlarged view of
a portion A of FIG. 1, and FIG. 3 is a partially enlarged view of a portion B of FIG. is there. The
speaker device includes a magnetic circuit 1, a frame 2, and a vibrating body 3. In this speaker
device, the magnetic circuit 1 is disposed on the front side of a diaphragm 31 (described later)
constituting the vibrating body 3, that is, on the front side of the speaker device (acoustic
radiation direction; X + direction in FIGS. 1 and 2). Is a magnetic circuit inversion type.
[0008]
The magnetic circuit 1 is a repulsion type configured by sandwiching the plate 11 with two
magnets 12 and 13 arranged so that the same poles face each other, and is an internal magnet
type. In the present embodiment, an example is shown in which an internal magnet type
magnetic circuit is adopted. However, the present invention is not limited to this, and an external
magnet type magnetic circuit may be adopted. The plate 11 is made of, for example, a magnetic
material such as pure iron, oxygen free steel, silicon steel or the like. The plate 11 has a
substantially disc shape. The upper end edge and the lower end edge of the plate 11 are
chamfered. In order to avoid contact with the voice coil support 33 described later, the
chamfering of the plate 11 is required in order to maintain a predetermined gap (clearance).
[0009]
Moreover, you may form a recessed part in the joint surface joined to the magnets 12 and 13 in
the plate 11 as needed. By causing the adhesive to enter the recess, it is possible to prevent the
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adhesive from flowing out from the joint surface of the plate 11 and the magnets 12 and 13.
Furthermore, the plate 11 may project relative to the magnets 12 and 13 toward the outer
peripheral side portion 15 a of the yoke 15 described later. With this configuration, leakage of
magnetic flux from the plate 11 toward the flange 14 c (described later) of the yoke 14 can be
suppressed, and the inside of the magnetic gap g between the plate 11 and the outer peripheral
side portion 15 a of the yoke 15 can be reduced. The magnetic flux density of can be made
relatively large.
[0010]
The magnets 12 and 13 are made of, for example, permanent magnets such as rare earth-based
(e.g., neodymium-based), samarium-cobalt-based, alnico-based, and ferrite-based magnets. The
magnet 12 has a substantially disk shape. On the other hand, the magnet 13 has a substantially
annular shape. The outer diameter of the magnet 12 and the outer diameter of the magnet 13
are substantially the same. The outer diameter of each of the magnets 12 and 13 is
approximately the same as or slightly smaller than the outer diameter of the plate 11. The plate
11 and the magnets 12 and 13 are fixed by, for example, an adhesive or the like so that the
central axes in the thickness direction substantially overlap each other.
[0011]
On the other hand, the yoke 14 is fixed to the lower surface of the magnet 12 by, for example, an
adhesive. The yoke 14 is made of, for example, a magnetic material such as pure iron, oxygenfree steel, silicon steel or the like. The yoke 14 is configured by integrally forming an upper plate
portion 14a, an outer peripheral side portion 14b, and a flange portion 14c. The cross-sectional
shape of the yoke 14 has a shape in which the upper plate portion 14 a protrudes toward a
diaphragm 31 described later. The upper plate portion 14a has a substantially disk shape. In the
upper plate portion 14a, a hole 14aa communicating with a space formed below the yoke 14 is
formed. By forming the holes 14aa in the yoke 14, the weight of the yoke 14 can be relatively
reduced, and hence the weight of the entire speaker device can be relatively reduced.
[0012]
Further, the outer diameter of the upper plate portion 14 a is substantially the same as or slightly
smaller than the outer diameters of the magnets 12 and 13. From the lower end of the outer
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peripheral portion of the upper plate portion 14a, an outer peripheral side portion 14b having a
substantially cylindrical shape falls substantially vertically. At the lower end of the outer
peripheral side portion 14b, a flange portion 14c having a substantially annular shape is
connected. For example, by making the outer diameter of the upper plate portion 14a smaller
than the outer diameter of the magnet 12 and forming a notch at the outer peripheral end of the
upper plate portion 14a, the magnet 12 and the upper plate portion 14a can be At the time of
fixing by means of an adhesive or the like, it is possible to prevent the adhesive or the like from
flowing from the upper plate portion 14a to the flange portion 14c and lowering the bonding
force between the magnet 12 and the yoke 14.
[0013]
The lower end inner periphery of the yoke 15 formed of a member different from the yoke 14 is
fitted to the outer peripheral edge of the flange portion 14c of the yoke 14 in a state where an
adhesive or the like is applied, for example. Although the yoke 14 and the yoke 15 are formed as
separate members in this embodiment, the present invention is not limited to this, and the yoke
14 and the yoke 15 may be integrally formed.
[0014]
Like the yoke 14, the yoke 15 is made of, for example, a magnetic material such as pure iron, an
oxygen-free steel, a silicon steel or the like. The yoke 15 is configured by integrally forming an
outer peripheral side portion 15a having a substantially cylindrical shape and a flange portion
15b having a substantially annular shape. The flange portion 15b is formed on the outer
peripheral side surface of the outer peripheral side portion 15a so as to extend outward at a
position approximately one third of the height of the outer peripheral side portion 15a from the
upper end of the outer peripheral side portion 15a There is. The flange portion 15 b is
detachably fitted to a frame 22 described later, whereby the yokes 14 and 15 are supported by
the frame 22. A magnetic gap g is formed between the inner peripheral wall of the outer
peripheral side portion 15 a and the outer peripheral end of the plate 11. In the present
embodiment, the planar shapes of the yokes 14 and 15 are both substantially circular, but the
invention is not limited thereto, and may be substantially elliptical or rectangular. The magnetic
circuit 1 described above is disposed on the front side of the diaphragm 31, which will be
described later, that is, on the front side of the speaker device (acoustic radiation direction; X +
direction in FIGS. 1 and 2).
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[0015]
The frame 2 is composed of a first frame 21 and a second frame 22. The first frame 21 and the
second frame 22 are made of, for example, an iron-based metal, a non-ferrous metal or an alloy
thereof, a synthetic resin or the like. Examples of iron-based metals include pure iron, oxygenfree steel and silicon steel. Examples of non-ferrous metals include aluminum, magnesium or
zinc. As the synthetic resin, for example, thermoplastic resins such as olefins such as
polypropylene (PP), ABS (acrylonitrile, bladderdiene, styrene), polyethylene terephthalate (PET),
etc. There is one in which a liquid crystal polyester resin is added. The first frame 21 and the
second frame 22 are formed by, for example, squeezing an iron-based metal, die-casting a nonferrous metal or an alloy thereof, or injection-molding a synthetic resin.
[0016]
The second frame 22 is configured by integrally forming an outer peripheral side portion 22a, a
bottom plate portion 22b, and a plurality of arm portions 22c. The outer peripheral side portion
22a has a substantially cylindrical shape. At the upper end of the outer peripheral side 22a, a
flange 22aa having a substantially annular shape is integrally formed with the outer peripheral
side 22a. A plurality of arms 22c extend radially and obliquely upward from the inner peripheral
edge of the bottom plate 22b, respectively, and reach the flange 15b of the yoke 15.
[0017]
Openings 50 are formed between the adjacent arms 22c. By forming each opening 50, it is
possible to discharge the air below the diaphragm 31 described later to the outside through the
opening 50. Therefore, when the speaker device is driven, the air pressure acting on the back
side of the diaphragm 31 becomes relatively large, and the diaphragm 31 can be prevented from
being difficult to vibrate. In addition, the air on the back side of the diaphragm 31 can move in
and out through the opening 50 formed between the diaphragm 22 and the arm 22 c of the
frame 22 to prevent the temperature inside the magnetic circuit 1 from becoming high. In
particular, it is possible to suppress the occurrence of high temperature demagnetization due to
the high temperature of the magnets 12 and 13.
[0018]
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At the upper end of each arm 22c, there is integrally formed a rising portion 22ca which rises
substantially vertically while approaching the collar 15b, and a horizontal portion 22cb which
extends substantially horizontally from the upper end of the rising portion 22ca near the upper
end of the yoke 15 There is. The inner periphery of the rising portion 22ca of each arm 22c and
the lower surface of the horizontal portion 22cb are fitted and attached to the flange portion
15b. Hereinafter, the flange portion 15b is also referred to as a connecting portion connecting
the yoke 15 and the second frame 22. The second frame 22 supports the magnetic circuit 1 by
the configuration described above.
[0019]
On the other hand, the outer peripheral portion of an edge 32 (described later) constituting the
vibrating body 3 is fixed to the upper surface of the flange 22aa by an adhesive or the like.
Further, the lower surface of a horizontal portion 21ca (described later) of the mounting portion
21c constituting the first frame 21 is fixed to the upper surface of the outer peripheral portion of
the edge 32 with an adhesive or the like. That is, the outer peripheral portion of the edge 32 is
sandwiched by the attachment portion 21 c forming the first frame 21 and the flange 22 aa of
the outer peripheral side portion 22 a forming the second frame 22. Thus, the first frame 21 and
the second frame 22 support the edge 32 and support the diaphragm 31 via the edge 32.
[0020]
The entire planar shape of the first frame 21 has a substantially annular shape. The first frame
21 is disposed on the back side of a diaphragm 31, which will be described later, that is, on the
back side of the speaker device (opposite to the sound radiation direction; X-direction in FIGS. 1
and 2). Further, the first frame 21 is configured by integrally forming a stepped portion 21a, a
plurality of curved portions 21b, and an attachment portion 21c from the inner circumferential
portion toward the outer circumferential portion. That is, the entire cross-sectional shape of the
first frame 21 exhibits a substantially curved shape from the inner circumferential portion to the
outer circumferential portion.
[0021]
The stepped portion 21 a is configured by integrally forming a horizontal portion 21 aa having a
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substantially annular shape and a vertical portion 21 ab standing approximately vertically from
the outer peripheral end of the horizontal portion 21 aa. In the stepped portion 21a, a plurality
of curved portions 21b extend downward while curving outward substantially symmetrically
from the connection point between the horizontal portion 21aa and the vertical portion 21ab. At
the lower end of each curved portion 21b, a mounting portion 21c having a substantially annular
shape is formed. An opening 51 is formed between the curved portions 21 b. That is, a plurality
of openings 51 are formed between the inner peripheral portion and the outer peripheral portion
of the first frame 21. The attachment portion 21c is a folded portion that is folded back toward
the inner peripheral side after hanging down substantially vertically from the outer peripheral
edge of the horizontal portion 21ca and the outer peripheral edge of the horizontal portion 21ca
extending outward substantially horizontally from the connection portion with each curved
portion 21b. 21cb are formed. That is, the cross-sectional shape of the attachment portion 21c is
substantially U-shaped.
[0022]
As described above, the upper surface of the outer peripheral portion of the edge 32 is fixed to
the lower surface of the horizontal portion 21ca constituting the mounting portion 21c by an
adhesive or the like. Further, as required, a shock absorbing material 52 made of an elastic
material such as thermosetting resin such as polyurethane resin, thermoplastic resin, or rubber
may be interposed between the horizontal portion 21 ca and the edge 32. The folded portion
21cb constituting the mounting portion 21c is engaged with the lower surface of the flange 22aa
of the outer peripheral side portion 22a constituting the second frame 22.
[0023]
The vibrating body 3 has a diaphragm 31, an edge 32, a voice coil support portion 33, a voice
coil 34, a damper 35, and a center cap 36. Examples of the material of the diaphragm 31 include
synthetic resins, foams obtained by foaming the synthetic resins, and metal materials such as
aluminum and magnesium. Examples of the synthetic resin include polypropylene (PP),
polyethylene, polystyrene, polyethylene terephthalate (PET), polyethylene naphthalate,
polymethyl methacrylate, polycarbonate, polyarylate, epoxy resin, acrylic resin and the like. In
addition, the diaphragm 31 may be made of a material having relatively small air permeability or
a material having almost no air permeability with respect to the damper 35 described later.
[0024]
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The diaphragm 31 has a substantially annular shape in plan view. The vertical cross-sectional
shape of the diaphragm 31 is substantially a reverse cone such that the outer peripheral portion
is located on the back side of the speaker device (the opposite side to the acoustic radiation
direction; X-direction in FIGS. 1 and 2) from the inner peripheral portion. It has a shape (inverted
conical shape). That is, the vertical cross-sectional shape of the diaphragm 31 has a shape in
which the height of the outer peripheral portion is lower than the height of the inner peripheral
portion.
[0025]
At the inner peripheral end (neck) of the diaphragm 31, as shown in FIG. 2, a rising portion 31a
rising substantially perpendicular to the vibration direction of the voice coil 34 (X +-X-direction
in FIG. 1) A first protrusion 31 b is formed to project from the inner periphery 31 a to the inner
periphery. Further, as shown in FIG. 1, an inclined portion 31 c which is inclined at a
predetermined angle is formed from the lower end of the rising portion 31 a toward the outer
peripheral edge. At the lower end of the inclined portion 31c, a horizontal portion 31d which
protrudes substantially horizontally to the outer peripheral side is formed.
[0026]
As shown in FIG. 2, in the vicinity of the upper end of the inclined portion 31c, that is, on the
inner peripheral portion of the diaphragm 31, the front side (sound radiation direction; X +
direction in FIG. 2) of the speaker device is convex. The first protrusion 31ca is formed. The first
protrusion 31ca has a top 31caa. The top portion 31caa is disposed closer to the inner peripheral
portion 31cc than the central position between the inner peripheral portion 31cc and the outer
peripheral portion 31cd of the first protrusion 31ca.
[0027]
On the other hand, in the vicinity of the lower end of the inclined portion 31c, ie, in the vicinity of
the outer peripheral portion of the diaphragm 31, as shown in FIG. 1, the back side of the
speaker device (opposite to the sound radiation direction; A plurality of second protrusions 31cb
protruding in a convex shape are formed at substantially equal intervals. The direction in which
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the plurality of second protrusions 31cb protrude and the direction in which the edge 32
described later protrudes are both on the back side of the speaker device. In the example of FIG.
1, three second protrusions 31 cb are formed.
[0028]
One of the second protrusions 31 cb is disposed in the vicinity of an inner circumferential
portion 32 a of an edge 32 described later. Thereby, the rigidity of the joint portion between the
diaphragm 31 and the edge 32 can be made relatively large, and the occurrence of split vibration
(including split resonance) occurring between the diaphragm 31 and the edge 32 can be
suppressed. it can.
[0029]
In the present embodiment, an example is shown in which both the direction in which the second
protrusion 31cb protrudes and the direction in which the edge 32 protrudes are the front side of
the speaker device (acoustic radiation direction; X + direction in FIG. 1). But it is not limited to
this. For example, the direction in which the second protrusion 31cb protrudes and the direction
in which the edge 32 protrudes may be on the back side of the speaker device (the opposite side
to the acoustic radiation direction; the X-direction in FIG. 1). The direction in which the second
projection 31cb protrudes is the front side of the speaker device (acoustic radiation direction; X +
direction in FIG. 1), while the protruding direction of the edge 32 is the rear side of the speaker
device (acoustic radiation direction It may be opposite (X-direction in FIG. 1). Furthermore, the
direction in which the second projection 31cb protrudes is the back side of the speaker device
(opposite to the acoustic radiation direction; X-direction in FIG. 1), while the direction in which
the edge 32 protrudes is the front side of the speaker device (Acoustic radiation direction; X +
direction in FIG. 1) or the like.
[0030]
In particular, when the diaphragm 31 has relatively small air permeability or little air
permeability with respect to the damper 35 described later, the front side and the rear side of the
diaphragm 31 are driven when the speaker device is driven. Therefore, relatively large air
pressure may act on the diaphragm 31 to cause deflection or the like. In such a case, it is
possible to suppress the occurrence of deflection or the like in the diaphragm 31 by reversing
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the direction in which the edge 32 protrudes and the direction in which the second protrusion 31
cb protrudes.
[0031]
The lower surface of the first projecting portion 31b constituting the diaphragm 31 and the inner
peripheral surface of the rising portion 31a are bonded to the outer peripheral surface in the
vicinity of the upper end of the voice coil support 33 having a substantially cylindrical shape as
shown in FIG. It is fixed. The first projecting portion 31 b has a shape that protrudes from the
rising portion 31 a toward the voice coil support portion 33. As a result, a liquid reservoir for
storing the adhesive can be formed by the first protrusion 31b and the rising portion 31a, and
the bonding between the diaphragm 31 and the voice coil support 33 can be made relatively
large. In addition, unnecessary vibration (for example, vibration in a direction substantially
perpendicular to the vibration direction of the voice coil 34) generated in the voice coil support
portion 33 can also be suppressed.
[0032]
On the other hand, as shown in FIG. 2, the outer peripheral surface of the first projecting portion
31 b and the outer peripheral surface of the rising portion 31 a constituting the diaphragm 31
are formed by the bonding portion 35 a formed on the inner peripheral portion of the damper 35
and the adhesive 38. It is fixed. That is, a predetermined distance is provided between the rising
portion 31 a of the diaphragm 31 and the joint 35 a of the damper 35, and the diaphragm 31
and the damper 35 are connected to each other through the adhesive 38. Further, by providing a
predetermined distance between the rising portion 31a of the diaphragm 31 and the joint
portion 35a of the damper 35, positioning of the diaphragm 31 and the damper 35 can be
simplified, and a vibrator is provided. It is possible to suppress the occurrence of unnecessary
vibration that occurs in 3.
[0033]
On the outer peripheral surface of the voice coil support portion 33, a plurality of through holes
33a having a substantially circular shape are formed. Each through hole 33a is for letting air in
and out between the inside and the outside of the speaker device. That is, when the inside of the
speaker device is sealed, the air in the speaker device is compressed and expanded, so-called
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springiness is exerted, the movement of the vibrating body 3 is suppressed, and the acoustic
characteristics of the speaker device are significantly degraded. Therefore, the through hole 33a
is provided to suppress the deterioration of the acoustic characteristic of the speaker device. A
voice coil 34 is wound around an outer peripheral surface near the lower end of the voice coil
support portion 33.
[0034]
The center cap 36 has, for example, an outer diameter substantially equal to the inner diameter
of the voice coil support portion 33, and is formed in a curved shape. The upper end opening of
the voice coil support portion 33 is closed at the upper end of the voice coil support portion 33,
and the back side of the speaker device (opposite to the sound radiation direction; X-direction in
FIG. 1) is convex. The outer peripheral portion of the center cap 36 is fixed by an adhesive or the
like. Thus, by connecting the center cap 36 to the voice coil support 33 (or the voice coil support
33 and the diaphragm 31), the strength (stiffness) of the voice coil support 33 and the
diaphragm 31 is reinforced. Thus, the divided vibration of the voice coil support portion 33 and
the diaphragm 31 is suppressed as much as possible. In the present embodiment, the center cap
36 is formed in a convex shape on the back side of the speaker device, but the present invention
is not limited thereto. Or you may form in flat form.
[0035]
Further, since the center cap 36 vibrates integrally with the diaphragm 31, it is responsible for
radiation of a part of the acoustic energy (mainly in the high frequency range), and phase
correction of the interference of sound waves caused by the shape of the diaphragm 31 is
performed It is also possible to adjust the acoustical properties of the device.
[0036]
On the other hand, on the back surface (the opposite side to the acoustic radiation direction; Xdirection in FIG. 1) of the outer peripheral portion 31d of the diaphragm 31, the inner peripheral
portion 32a of the edge 32 having a substantially annular shape in plan view is adhesive or the
like It is fixed by
Edge 32 combines moderate compliance and stiffness. The edge 32 includes an inner peripheral
portion 32a having a substantially flat joint portion, a roll portion having a curved cross-sectional
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shape on the outer side thereof, and an outer peripheral portion 32b having a substantially flat
joint portion on the outer side thereof. . The inner peripheral portion 32a of the edge 32 is
connected to the outer peripheral portion (horizontal portion 31d) of the diaphragm 31, and the
outer peripheral portion 32b of the edge 32 is connected to the frame 2 and joined by an
adhesive or the like. The inner circumferential portion 32 a of the edge 32 has a flange portion
32 c extending in a direction substantially perpendicular to the vibration direction of the voice
coil 34 and a rising portion 32 d rising in the vibration direction of the voice coil 34.
[0037]
On the other hand, the outer peripheral portion of the diaphragm 31 extends in the direction
substantially perpendicular to the vibration direction of the voice coil 34 and the falling portion
31 e which descends downward so as to follow the shape of the inner peripheral portion 32 a of
the edge 32. And the existing horizontal portion 31d. Since the outer peripheral portion of the
diaphragm 31 is connected to the inner peripheral portion 32a of the edge 32 with an adhesive
or the like along the inner peripheral portion 32a of the edge 32, the bonding force between the
diaphragm 31 and the edge 32 is obtained. This can be made relatively large, and the rigidity at
the joint portion between the diaphragm 31 and the edge 32 can be made relatively large, and
the occurrence of split vibration (including split resonance) can be suppressed.
[0038]
The edge 32 has a cross-sectional shape in which the back side (the opposite side to the acoustic
radiation direction; the X-direction in FIG. 1) of the speaker device is convex. As the material of
the edge 32, other than the material of the above-mentioned diaphragm 31, for example, a
hybrid material comprising a resin such as rubber or polyurethane, a foamed rubber, a foamed
resin, or a synthetic resin such as polypropylene and a metal such as tungsten Known materials
may be used.
[0039]
The damper 35 combines moderate compliance and rigidity. The damper 35 is formed, for
example, by impregnating a cloth with a phenolic resin or the like, or a solution comprising a
phenolic resin and an organic solvent, and the like by heat molding. The damper 35 has a
substantially annular shape in plan view. The damper 35 is configured by integrally forming the
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joint portion 35a, the first flat portion 35b, the curved portion 35c, and the second flat portion
35d in order from the inner peripheral portion to the outer peripheral portion. . The damper 35
may have relatively high air permeability to the edge 32.
[0040]
The joint portion 35a is bent inwardly toward the first projecting portion 31b and the rising
portion 31a of the diaphragm 31 at an inner lower side at a predetermined angle from the
connecting portion with the first flat portion 35b. The bonding portion 35a has a shape bent
toward the rising portion 31a of the diaphragm 31, so that the bonding area between the rising
portion 31a of the diaphragm 31 and the bonding portion 35a of the damper 35 can be made
relatively large. it can. The first flat portion 35b has a substantially annular shape in plan view,
that is, a shape extending in a substantially horizontal direction (a direction substantially
perpendicular to the vibration direction of the voice coil 34). By causing the first flat portion 35 b
to extend in a substantially horizontal direction, it is possible to suppress the occurrence of
unnecessary vibration (such as vibration in a direction substantially perpendicular to the
vibration direction of the voice coil 34) in the voice coil support portion 33. it can. The damper
35 has a straight portion 35c connected to the first flat portion 35b. The bending portion formed
from the first flat portion 35b to the linear portion 35c is efficiently bent at the bending portion
when unnecessary vibration occurs in the voice coil supporting portion 33, so that the voice coil
supporting portion 34 is not required efficiently. Vibration can be suppressed.
[0041]
Further, the curved portion 35d disposed between the straight portion 35c connected to the
outer peripheral portion of the first flat portion 35b and the straight portion 35c has a
concentric shape in plan view. That is, the cross-sectional shape of the curved portion 35d is
convex on the front side of the speaker device or convex on the rear side of the speaker device.
The lower surface of the second flat portion 35e connected to the outer peripheral portion of the
curved portion 35d and constituting the outer peripheral portion of the damper 35 is fixed to the
upper surface of the horizontal portion 21aa of the step portion 21a constituting the first frame
21 by an adhesive or the like. ing. Thus, the first frame 21 supports the damper 35 and also
supports the diaphragm 31 via the damper 35.
[0042]
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Therefore, in the stationary state of the speaker device (the speaker device is not driven), the
damper 35 and the edge 32, the diaphragm 31, the center cap 36, the voice coil support portion
33 and the voice coil 34 are each at predetermined positions of the speaker device. It supports
elastically. Further, the damper 35 elastically holds the voice coil 34 and the voice coil support
portion 33 at a predetermined position where the members such as the plate 11 and the magnets
12 and 13 do not contact the members constituting the magnetic circuit 1.
[0043]
In addition, the damper 35 elastically supports the diaphragm 31, the voice coil support portion
33, the voice coil 34, and the center cap 36 along the vibration direction in the driven state of
the speaker device.
[0044]
Next, with reference to FIG. 4, a part of the method of assembling the speaker device having the
above-described configuration will be described.
When joining the outer peripheral surface of the first projecting portion 31b and the outer
peripheral surface of the rising portion 31a constituting the diaphragm 31, and the bonding
portion 35a of the damper 35, as shown in FIG. Do.
[0045]
When assembling the speaker device, first, the lower surface of the second flat portion 35e
forming the outer peripheral portion of the damper 35 is fixed to the upper surface of the
horizontal portion 21aa of the stepped portion 21a forming the first frame 21 for convenience of
the process. Next, the joint portion 35 a formed on the inner peripheral portion of the damper 35
is fixed to the outer peripheral surface of the first projecting portion 31 b constituting the
diaphragm 31 and the outer peripheral surface of the rising portion 31 a.
[0046]
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Therefore, a predetermined gap (clearance) is provided between the joint 35 a of the damper 35
and the first projecting portion 31 b and the rising portion 31 a of the diaphragm 31 so as not to
interfere with each other. Because the above-mentioned gap (clearance) is not provided, the
lower surface of the second flat portion 35e forming the outer peripheral portion of the damper
35 is on the upper surface of the horizontal portion 21aa of the step portion 21a forming the
first frame 21. When the joint 35a of the damper 35 is fixed to the first projecting part 31b or
the rising part 31a of the diaphragm 31 after being fixed, the joint 35a of the damper 35 is on
the first projection 31b or the rising part 31a of the diaphragm 31. Since it will float up, it will
become difficult for the junction part 35a of the damper 35 to adhere to the first projecting part
31b or the rising part 31a of the diaphragm 31.
[0047]
However, when the gap (clearance) is provided, as shown in FIG. 4, the adhesive 43 applied by
the nozzle 41 includes the bonding portion 35 a of the damper 35 and the first projecting
portion 31 b and the rising portion 31 a of the diaphragm 31. There is a possibility that it may
flow downward from the clearance (clearance) without staying in between.
[0048]
Therefore, in the present embodiment, the first protrusion 31b is formed on the inner peripheral
portion of the diaphragm 31, and the first protrusion 31ca is formed in the vicinity of the first
protrusion 31b, as shown in FIG. As shown, the adhesive 43 applied by the nozzle 41 is kept
between the joint 35 a of the damper 35 and the first projecting portion 31 b and the rising
portion 31 a of the diaphragm 31.
As a result, the bonding force between the diaphragm 31 and the damper 35 is sufficiently
secured.
[0049]
Further, according to the embodiment of the present invention, as shown in FIG. 5, the first
projection 31 ca formed on the inner peripheral portion of the diaphragm 31 may lower the
characteristic of the sound pressure level in the high region. it can. FIG. 6 is an example of the
characteristic of the sound pressure level when the first protrusion 31 ca is not formed on the
inner peripheral portion of the diaphragm 31 in the speaker device shown in FIG. 1. As can be
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understood by comparing FIGS. 5 and 6, when the first projection 31ca is formed on the inner
peripheral portion of the diaphragm 31 as in the speaker device according to the present
embodiment, the sound pressure in the high region is obtained. The level characteristics can be
reduced. Therefore, the speaker device according to the present embodiment can be applied to a
subwoofer that reproduces a low-pitched sound, in particular, a speaker device for which it is
desired to cut the sound pressure level characteristic of a high frequency band.
[0050]
Furthermore, according to the embodiment of the present invention, since the rigidity of the
diaphragm 31 can be increased, the sound pressure level in the low range can be relatively
increased. Further, according to the embodiment of the present invention, since the second
projection 31 cb is formed on the outer peripheral portion of the diaphragm 31, it is possible to
suppress the occurrence of resonance or the like including split resonance.
[0051]
FIG. 7 is a cross-sectional view showing a configuration of a door 62 of a car attached with the
speaker device 61 according to the present embodiment. In FIG. 7, the bracket 63 is disposed on
the back surface of the door 62, the unit member 64 is attached to the surface of the door 62,
and the speaker device 61 is attached via the unit member 64.
[0052]
As mentioned above, although the embodiment of the present invention has been described in
detail with reference to the drawings, the specific configuration is not limited to this embodiment,
and the design change within the scope of the present invention is not limited. The present
invention is included in the present invention. For example, in the above-mentioned embodiment,
although the damper 35 showed the example in which the corrugation which exhibits a
concentric-circle shape is formed, it is not limited to this, It is not necessary to form a corrugation
in the damper 35.
[0053]
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Further, in the above-described embodiment, an example is shown in which the planar shape of
the speaker device has a substantially circular shape. However, the present invention is not
limited to this. The planar shape of the speaker device may have a substantially rectangular
shape. Furthermore, in the above-described embodiment, since the planar shape of the speaker
device has a substantially circular shape, an example in which both the plate 11 and the magnet
12 have a substantially disk shape is shown, but the present invention is not limited thereto. For
example, when the planar shape of the speaker device is substantially rectangular, the plate 11
and the magnet 12 may be substantially flat.
[0054]
It is a sectional view showing the composition of the speaker apparatus concerning the 1
embodiment of the present invention. It is the elements on larger scale of A part of FIG. It is the
elements on larger scale of B part of FIG. It is sectional drawing for demonstrating a part of
assembly method of the speaker apparatus based on one embodiment of this invention. It is a
figure which shows an example of the sound pressure level characteristic of the speaker
apparatus which concerns on one embodiment of this invention. It is a figure which shows an
example of the sound pressure level characteristic in the speaker apparatus which concerns on
one embodiment of this invention. It is sectional drawing which shows the structure of the door
of the motor vehicle which attached the speaker apparatus based on one embodiment of this
invention.
Explanation of sign
[0055]
DESCRIPTION OF SYMBOLS 1 ... Magnetic circuit, 2 ... Frame, 3 ... Vibrator, 11 ... Plate, 12, 13 ...
Magnet, 14, 15 ... Yoke, 14a ... Upper plate part, 14b, 15a ... Outer peripheral side part, 14c, 15b
... Collar part 21: first frame 21a: stepped portion 21aa: horizontal portion 21ab: vertical portion
21b: curved portion 21c: mounting portion 21ca: horizontal portion 21cb: folded portion 22:
second frame 22a: Outer peripheral side portion, 22aa: flange, 22b: bottom plate portion, 22c:
arm portion, 22ca: rising portion, 22cb: horizontal portion, 31: diaphragm, 31a: rising portion,
31b: first projecting portion, 31c: inclined portion, 31ca: first projection, 31caa: apex, 31cb:
second projection, 31cc: inner circumferential portion, 31 cd: outer circumferential portion, 31 d:
horizontal portion, 32: edge, 32a: inner circumferential portion, 32b: outer circumferential
portion, 3 c: flange portion 32d: rising portion 33: voice coil support portion 33a: through hole
34: voice coil 35: damper 35a: joint portion 35b: first flat portion 35c: curved portion 35d:
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Second flat portion 35 e: Flat portion 36: Center cap 37, 38, 42, 43: Adhesive, 41: Nozzle, 50, 51:
Opening portion 52: Buffer material 61: Speaker device 62: Door , 63 ... bracket, 64 ... member
for unit
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