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JP2001225010

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DESCRIPTION JP2001225010
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
multifunctional sounding body incorporated in a mobile communication device such as a cellular
phone or a pager to notify a user of an incoming call by sound or vibration.
[0002]
2. Description of the Related Art In general, the portable device as described above is configured
to be able to switch between emitting a buzzer sound and a melody to notify the user of an
incoming call and vibrating it without emitting a sound. Therefore, a structure has been adopted
in which a sound producing body for generating sound similar to a small speaker and a vibrating
body that generates vibration by rotating an eccentric weight with a small motor have been
incorporated. As described above, incorporating both a sound generator and a vibrator has been
disadvantageous in terms of downsizing and cost reduction of the device, but in recent years, one
that generates both sound and vibration in one sound generator is used Came to be Some sound
producing bodies of this type are multifunctional that can also be used for voice output when
talking in a hands free state.
[0003]
FIG. 5 shows a vibration generator disclosed in Japanese Patent Application Laid-Open No. 10-
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257594. A magnetic circuit unit 1 integrates a yoke 2 consisting of a short cylindrical center
pole 2a and a flange 2b, an annular magnet 3 and a top plate 4 together. The magnetic gap is
formed between the outer periphery of the center pole 2 a and the inner periphery of the top
plate 4. The magnetic circuit unit 1 is supported by a first suspension 5 with a curved cross
section and joined to the upper end of a support member 6 to constitute a mechanical vibration
system. In addition, a disc-shaped second suspension 9 supporting a voice coil 8 is joined to the
upper end of the support member 6, and the disc-shaped first diaphragm 7 is joined to the lower
end of the support member 6. The coil 8 is located in the magnetic gap of the magnetic circuit
unit 1. A closed chamber 10 is formed between the magnetic circuit unit 1, the first suspension 5
and the first diaphragm 7.
[0004]
When an alternating current electrical signal is input to the voice coil 8 of the vibration
generator of this configuration, an electromagnetic force is generated between the voice coil 8
and the magnetic circuit unit 1 to vibrate the magnetic circuit unit 1 and this vibration is
supported. It is transmitted through the member 6 to the device incorporating this vibration
generator to notify the user of an incoming call. In another embodiment described in the above
document, the second suspension 9 which is a flat plate in FIG. 5 is a second diaphragm having a
corrugated cross section, in which case the electricity supplied to the voice coil is used. If the
frequency of the signal is relatively low below the audible frequency band, the magnetic circuit
unit 1 vibrates to notify the user of an incoming call as in the above description, but the
frequency of the electrical signal is somewhat high and the audible frequency range The
magnetic circuit portion supported by the first suspension 5 hardly vibrates because the natural
frequency is low, while the vibration of the second diaphragm to which the voice coil 8 is fixed
becomes large. Generate a buzzer sound. As a result, it is possible to obtain a multifunctional
sounding body that operates in both sounding and vibration with one sounding body according
to the frequency of the supplied electric signal.
[0005]
FIG. 6 shows a multi-function sounding body disclosed in Japanese Patent Application Laid-Open
No. 11-68093. FIG. 6A is a plan view, and FIG. 6B is a cross-sectional view taken along line B-B of
FIG. The support member 15 has a rectangular outline and accommodates the magnetic circuit
unit 21 in a central circular cavity. The magnetic circuit portion 21 is formed by integrating the
yoke 16, the magnet 12, and the top plate 13. Further, an annular weight 19 is attached to the
outer periphery of the yoke 16, and the movable portion 22 is formed by the magnetic circuit
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portion 21 and the weight 19. Configured. The suspension 17 has a support portion 17a
attached to the upper surface of the weight 19 to support the movable portion 22, and a fixed
portion 17c at the tip of the arm portion 17b is fixed to the receiving portion of the support
member 15.
[0006]
The suspension 18 has the same shape as the suspension 17, but the support is attached to the
lower surface of the weight 19 to support the movable portion 22 at a position rotated 90 ° in
plan view with respect to the suspension 17, and the arm A fixing portion 18 c at the tip of 18 b
is fixed to the receiving portion of the support member 15. In the magnetic gap between the
inner periphery of the central recess of the yoke 16 and the outer periphery of the top plate 13,
the circular diaphragm 11 is attached to the outer periphery of the lower surface of the support
member 15 and the voice coil 14 fixed to the diaphragm 11 is It is inserted. The winding
terminal of the voice coil 14 is connected to the input terminal 20.
[0007]
The operation of the multi-function sounding body of FIG. 6 is the same as that described above.
When an audio frequency signal current flows through the voice coil 14, the diaphragm 11
receives the attraction force of the magnetic circuit unit 21 and vibrates to generate sound. If the
frequency of the generated signal is low and it is in the mechanical vibration region, no sound is
emitted from the diaphragm 11, while the movable portion 22 vibrates to notify the user of an
incoming call.
[0008]
FIG. 7 shows the structure of the movable portion of the multi-function sounding body disclosed
in Japanese Patent Application Laid-Open No. 11-69488, and two suspensions 17 above and
below the magnetic circuit portion 21 having the magnet 12 and the top plate 13 mounted on
the yoke 16. The fixed portion 18 is fixed, and the fixed portion at the tip of the arm portion of
each of the suspensions 17 and 18 is fixed to the support member as shown in FIG. 6 to
constitute a multifunctional sounding body.
The two suspensions 17 and 18 are fixed at 90 ° offset from each other for the stability of the
spring operation, and the pair of dowels 16a and 16b is provided on the upper and lower
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surfaces of the yoke 16, and the small holes of the suspensions 17 and 18 are provided. These
dowels are fitted and positioned.
[0009]
In the case of the prior art shown in FIG. 5, since the first suspension 5 of the curved cross
section which elastically supports the magnetic circuit portion 1 is a film-like member,
displacement is large even if it is desired to increase vibrational energy. It is difficult to cause the
stress, or the stress is increased and the material is easily fatigued. And since the first suspension
5 only supports the upper surface side of the magnetic circuit unit 1, if the magnetic circuit unit
1 tends to tilt during vibration, this can not be prevented. The center pole 2a and the top plate 4
may come in contact with each other to generate noise or damage parts.
[0010]
In the conventional example of FIG. 6, since the upper and lower sides of the movable portion 22
in which the magnetic circuit portion 21 and the weight 19 are integrated are supported by the
two suspensions 17 and 18, the movable portion 22 may be inclined during vibration. Because
the arms 17b and 18b of the suspension that supports the movable part have a length, the stress
of the suspensions 17 and 18 does not become excessive during vibration, but the arms 17b and
18b of the suspensions 17 and 18 do not Since the fixed parts 17c and 18c at the tip have a
certain area, when the two suspensions are mounted 90 degrees apart, the fixed parts 17c and
18c occupy the four corners of the support member 15 and the contour of the support member
15 It must be rectangular or square, and can not be circular with a small area.
[0011]
In the prior art shown in FIG. 7, positioning at the time of fixing the suspensions 17, 18 to the
magnetic circuit portion 21 is performed by fitting the dowels 16a, 16b of the upper and lower
surfaces of the yoke 16 with the small holes provided in the suspensions 17, 18. .
However, for this purpose, the dowel diameter and the small hole diameter, and the center-tocenter distance between the two dowels and between the two small holes must be precisely
manufactured, which increases the processing time. The present invention aims to solve these
problems and to realize a useful multifunctional speaker.
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[0012]
[Means for Solving the Problems] In the multi-function type sounding body which has appeared
on the market conventionally, the magnetic circuit part is a short cylindrical magnet inside the
yoke of a deep dished magnetic material with the edge of a short cylinder. In the configuration in
which the top plate of the magnetic body is joined to the upper surface of the magnet, and the
magnet is positioned inside the voice coil, it is limited to what is called an internal magnet type.
On the other hand, in the present invention, an external magnet type magnetic circuit is used.
[0013]
In an external magnet type magnetic circuit, the magnetic path is provided with a pole piece with
a flange attached to a center pole which is a short cylindrical portion, and an annular magnet
having an inner diameter larger than the voice coil outer diameter to surround the voice coil. And
an annular top plate is joined to the top surface of the magnet. The magnetic circuit portion is
elastically supported by a support spring and accommodated in the cover. The support spring
has a shape in which an inner peripheral portion and an annular outer peripheral portion are
connected by a plurality of arc-shaped arm portions, and the inner peripheral portion is fixed to a
magnetic circuit portion by spot welding or the like. Fix to the cover by Since the support spring
is circular, the cover can also be made circular.
[0014]
Furthermore, in the present invention, one additional support spring having an annular outer
periphery as described above is additionally used, and two magnetic springs are supported on
the upper and lower sides. As a result, the magnetic circuit portion does not swing sideways on
both the upper and lower surfaces and does not incline, and contact between the magnetic circuit
portion and the voice coil during vibration can be prevented. The two support springs are
disposed 90 degrees apart from each other to prevent the directionality of the spring
characteristics.
[0015]
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Further, in the present invention, when the support spring is fixed to the magnetic circuit portion,
a low-profile circular step portion is formed on each surface of the pole piece and the top plate,
and the round hole in the inner peripheral portion of the support spring is these step portions.
Center the parts with each other by putting them in place. As in the prior art shown in FIG. 7,
there is no need to fit the plurality of dowels and the small holes, so that it is not necessary to
accurately manufacture the center distance between the dowels or the small holes.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below based on the drawings. FIG. 1 shows a first embodiment of a multifunctional
speaker according to the present invention, wherein FIG. (A) is a plan view and FIG. (B) is a
sectional view taken along the line B-B in (A). The figure (A) is drawn with the diaphragm 34 seen
in the figure (B) removed for clarity. A magnetic circuit section 33 is housed in a case where a
resin cover A (31) and a cover B (32) are butted, and the magnetic circuit section 33 is a pole of
magnetic material consisting of a short cylindrical center pole 38a and a flange 38b. An annular
magnet 37 is joined to the flange 38 b of the piece 38, and a top plate 39 of the same annular
magnetic material is joined to the upper surface of the magnet 37. Fix the inner periphery of the
support spring A (36) to the top plate 39 by point welding or other means, and fix the outer
periphery of the support spring A (36) to the cover B (32) by bonding or insert molding The
magnetic circuit portion 33 is elastically supported by the support spring A (36) to constitute a
vibrating portion.
[0017]
As seen in FIGS. 1A and 1B, two protrusions 38c are provided outward on the outer periphery of
the flange 38b of the pole piece 38. As shown in FIG. Since the front end approaches the inner
periphery of the cover A (31), it is possible to prevent the magnetic circuit portion 33 from being
excessively displaced in the lateral direction and damaged when receiving an impact force or the
like. The diaphragm 34 is fixed to the upper surface of the cover B (32), the voice coil 35 is fixed
to the diaphragm 34, and the voice coil 35 is formed by the outer periphery of the center pole
38a and the inner periphery of the top plate 39. Located within the magnetic gap.
[0018]
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A ring 40 of magnetic material is provided to shield the magnetic circuit portion 33 and prevent
the generated magnetic field from leaking to the outside of the case. The cover B is provided with
two connection terminals 41 for connection to an external circuit, and the end of the winding of
the voice coil 35 is connected thereto by soldering or the like. The ground terminal 36d is
integrally formed with the support spring A (36), and serves to prevent the electrostatic
breakdown of the circuit by releasing the static electricity carried by the magnetic circuit portion
33 to the ground when incorporated in the external circuit.
[0019]
The operation of the multi-function sounding body of the present invention is the same as that of
the conventional example, and when signal current is flowed to the voice coil 35 through the
connection terminal 41, alternating electromagnetic force is generated between the magnetic
circuit unit 33 and the voice coil 35. If the frequency of the signal is in the audio frequency band,
the diaphragm 34 vibrates to generate sound, and if the frequency is lower than that, the
vibration of the diaphragm 34 becomes small and no sound is generated, and the support is
supported instead. The magnetic circuit unit 33 supported by the spring A (36) mechanically
vibrates, and the vibration is transmitted to the device incorporating the vibration through the
case to notify the user of an incoming call.
[0020]
FIG. 2 is a plan view of the support spring A (36).
In the support spring A (36), two arc-shaped arm portions 36b extend from the inner peripheral
portion 36a and are connected to the annular outer peripheral portion 36c. As described above,
the inner circumferential portion 36a is fixed to the magnetic circuit portion 33, and the outer
circumferential portion 36c is fixed to the cover B (32). This allows the contour of the case to be
circular as seen in FIG. In the conventional suspension 17 which does not have an annular outer
peripheral portion as shown in FIGS. 6 and 7, the case contour is squared in order to fix the
fixing portion 17c at the tip of the arm 17b to the support member 15. Compared to the circular
case as in the present invention, the area is increased, which is disadvantageous in reducing the
size of the device. In FIG. 2, reference numeral 36d denotes a ground terminal, which has nothing
to do with the spring function of the support spring (36), but if it is provided as described above,
the magnetic circuit portion 33 can be advantageously grounded.
[0021]
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FIG. 3 is a cross-sectional view of a second embodiment of the multifunctional speaker according
to the present invention, which is another supporting spring B (42) in the first embodiment
shown in FIG. It is added and configured. The support spring B (42) fixes the inner peripheral
portion to the pole piece 38 by point welding or the like, and fixes the outer peripheral portion to
the cover A (31). In the case of the multi-function sound generator of FIG. 1, the magnetic circuit
unit 33 basically performs simple vertical vibration, but it tends to be inclined during vibration
due to slight imbalance of weight and the like. Then, the upper end outer periphery of the center
pole 38 a and the inner periphery of the top plate 39 may contact the voice coil 35 to generate
noise or cause disconnection of the voice coil 35. In the embodiment of FIG. 3, by supporting the
lower surface side of the magnetic vibration unit 33 also by the support spring B (42), the lateral
vibration of the upper and lower surfaces of the magnetic vibration unit 33 is prevented and the
magnetic vibration unit 33 is not inclined. It vibrates up and down.
[0022]
A plan view of the upper and lower two support springs of FIG. 3 is shown in FIG. 4, and (A)
shows a support spring A (36) and FIG. (B) shows a support spring B (42). The support spring B
(42) has the same shape as the support spring A (36) except that it is not necessary to provide
the ground terminal 36d, and includes an inner peripheral portion 42a, an arm portion 42b and
an outer peripheral portion 42c. However, as seen in the relationship between (A) and (B) of FIG.
This is to obtain uniform spring characteristics regardless of the direction as much as possible.
[0023]
Using two support springs in this way has the following advantages in addition to preventing
inclination of the magnetic circuit portion. That is, since the spring constant of one support
spring may be half of the spring constant required for the vibration system, the arms 36b and
42b can be elongated to reduce stress. In addition, if the resonant frequency of the vibration
system is close to the frequency of the drive signal, the vibration is excessive and it is easy to
cause inclination etc. It is preferable to separate the resonant frequency from the frequency of
the signal. It is easier to share two supporting springs rather than doing it.
[0024]
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The plan view of the embodiment of FIG. 3 is substantially the same as FIG. 1A, and two
protrusions 38c are provided outward on the outer periphery of the flange 38b of the pole piece
38. As shown in FIG. Although the projection 38c makes the tip approach the inner wall of the
cover as described above to prevent unnecessary displacement in the lateral direction, one
reason for not making the cover approach the cover all around the flange 38b is to do so. This is
because the air resistance to the flange increases, and the free vibration of the magnetic circuit
unit 33 is inhibited.
[0025]
As another reason, as shown in FIG. 3, since the support spring B (42) is in close contact with the
flange 38b or the projecting portion 38c of the pole piece 38 or has only an extremely narrow
gap, the entire circumference of the flange 38b is covered. If the magnetic circuit portion 33 tries
to displace downward when the magnetic circuit portion 33 approaches the inner wall, the arm
portion 42b (FIG. 4B) of the support spring B (42) can not be bent by overlapping with the flange
38b. Therefore, the magnetic circuit unit 33 can not be displaced downward. Therefore, the
protrusion 38c is provided only in the vicinity of the portion where the arm 42b of the support
spring B (42) is connected to the inner circumferential portion 36a.
[0026]
Another feature of the present invention is a method of positioning parts to secure the support
spring A (36) and the support spring B (42) to the magnetic circuit portion 33. For this, as shown
in FIG. 3, a circular step portion 44 is provided on the top surface of the top plate 39, and a
circular step portion 43 is also provided on the bottom surface of the flange 38b of the pole
piece 38. Then, round holes of large diameter of the inner peripheral portions 36a and 42a of the
support spring A (36) and the support spring B (42) shown in FIG. 4 are fitted to these stepped
portions and fixed by point welding or the like. As a result, there is no restriction that the center
distance between the dowels and the small holes requires accuracy as in the positioning using
the dowels and the small holes in the conventional example in FIG. Jigs etc. will also be simple.
[0027]
As described above, in realizing the external magnet type multifunctional sounding body as
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described above, since the support spring for elastically supporting the magnetic circuit portion
has the annular outer peripheral portion, the case is also circular. The product is miniaturized,
and the upper and lower sides of the magnetic circuit unit are supported using two supporting
springs, so that the magnetic circuit unit does not tilt during vibration, and the magnetic circuit
unit and the voice are Contact between the coils is prevented, and noise and component damage
are avoided. Further, centering of the magnetic circuit portion and the support spring is
performed by fitting the circular step portions respectively provided on the pole piece and the
top plate, which are components of the magnetic circuit portion, and the round holes in the inner
peripheral portion of the support spring. It is simple and accurate. As described above, according
to the present invention, the external-magnet-type magnetic circuit can provide a compact, highperformance, and inexpensive multi-function sounding body that has two functions of sounding
and vibration.
[0028]
Brief description of the drawings
[0029]
1 is a plan view of the embodiment of the multi-function type sounding body of the present
invention, FIG. (B) is a cross-sectional view taken along the line B-B of (A).
[0030]
2 is a plan view of a support spring A used in the multifunctional sounding body of FIG.
[0031]
FIG. 3 is a cross-sectional view of another embodiment of the multifunctional speaker according
to the present invention.
[0032]
FIG. 4 is a plan view of two support springs used in the multifunctional sounding body of FIG. 3,
in which (A) shows a support spring A and (B) shows a support spring B. FIG.
[0033]
5 is a cross-sectional view of a conventional multi-functional sound generator.
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[0034]
FIG. 6 shows another conventional multi-function sounding body, wherein FIG. (A) is a plan view
and FIG. (B) is a cross-sectional view taken along line B-B of (A).
[0035]
7 (A) is a plan view, FIG. (B) is a cross-sectional view taken along the line B-B of (A).
[0036]
Explanation of sign
[0037]
DESCRIPTION OF SYMBOLS 1, 21, 33 Magnetic circuit part 2, 16 yoke 3, 12, 37 Magnet 4, 13,
39 Top plate 7, 11, 34 Diaphragm 8, 14, 35 Voice coil 16a, 16b Dowels 17, 18 Suspension 36
Support spring A36a, 42a Inner circumferential portion 36b, 42b Arm portion 36c, 42c Outer
circumferential portion 38 Pole piece 38a Center pole 38b Flange 38c Projection portion 42
Support spring B
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