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JP2008182394

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2008182394
An electro-acoustic transducer configured to be mounted on an external device, which can be
configured thin and secures sufficient strength, and adversely affects an antenna that is another
electronic component mounted on the external device. It is intended to provide an electroacoustic transducer which is free from any adverse effects. The electro-acoustic transducer (10)
is configured to be mounted on an external device, but the cover member (24) is formed of a
resin and further faces the edge portion (12B) of the diaphragm (12) of the cover member (24).
Ribs 25 are formed on the surface. [Selected figure] Figure 1
Electro-acoustic transducer
[0001]
The present invention relates to an electroacoustic transducer configured to be mounted on an
external device.
[0002]
In general, electroacoustic transducers such as small-sized microphones and speakers (receivers)
are configured to be able to be mounted on an external device.
At that time, many devices are mounted and used in the housing of an external device. A mobile
phone is an example of this external device. In a mobile phone, in addition to the electroacoustic
transducer, various electronic components such as a liquid crystal panel, an antenna, and a
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battery are internally provided. In addition, in recent cellular phones, the thickness has been
reduced, and accordingly, there is a demand to reduce the thickness of electronic parts to be
installed. Of course, the demand for thinning of the electroacoustic transducer is also increasing.
In addition, even if the electroacoustic transducer is thinned, its durability, impact strength, and
acoustic characteristics are in the situation where the conventional quality is required. In the case
of the electroacoustic transducer, a diaphragm is mentioned as a portion weak in strength. In
order to protect the diaphragm, a cover member on the surface of the diaphragm is essential.
[0003]
For example, in Patent Document 1, a cover member made of stainless steel is described as a
cover member on the surface of the diaphragm. As described above, the diaphragm is protected
by the robust stainless steel cover member, and the diaphragm is prevented from being damaged.
[0004]
In addition, although the speaker described in "Patent Document 2" is a large-sized speaker, one
that reinforces the resin-made grill to a thick thickness and covers the entire surface of the
diaphragm to protect it is disclosed.
[0005]
JP, 2002-354582, A JP, 8-23592, A
[0006]
The speaker described in the above-mentioned "patent document 1" is excellent in strength
because it has a cover member made of stainless steel, and has conventionally been used as an
electroacoustic transducer to be installed in a mobile phone.
[0007]
However, in recent mobile phones, the antenna has also been made smaller and thinner because
of the thinning, and the reception sensitivity of radio waves is lowered due to the stainless steel
cover member of the speaker, which has not been affected conventionally. It has come to come
out.
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[0008]
Along with this, it has become necessary to change the stainless steel cover member of the
speaker to a resin cover member.
However, if the thickness of the cover member made of resin is reduced, the strength may be
weakened.
In addition, although it is possible to reinforce the wall thickness to increase the strength as in
the speaker described in the above-mentioned "patent document 2", in the case of a small
speaker, it differs from the large-sized speaker described in "patent document 2" Since there is
only a minute gap between the diaphragm and the cover member, it is difficult to thicken the
entire surface of the diaphragm.
[0009]
The present invention has been made in view of such circumstances, and in an electroacoustic
transducer configured to be mounted on an external device, the external device can be
configured thin and secures sufficient strength. It is an object of the present invention to provide
an electroacoustic transducer which does not adversely affect an antenna which is another
electronic component to be mounted thereon.
[0010]
The present invention achieves the above object by devising the configuration of the cover
member.
[0011]
That is, the electro-acoustic transducer according to the present invention comprises: a
diaphragm having a flat portion in the center, a diaphragm having an edge portion around the
flat portion, and an additional plate mounted on the flat portion of one end of the diaphragm.
One end is fixed to the other end of the diaphragm, and a voice coil formed by winding a
conducting wire, a magnetic circuit unit having a magnetic gap for accommodating the other end
of the voice coil, and A speaker comprising: a case for protecting a magnetic circuit unit; and a
cover member attached to the case and covering a part of the magnetic circuit unit, the cover
member is formed of a resin, and the cover It is an electro-acoustic transducer characterized in
that a beam portion is formed on at least a surface of the member facing the edge portion of the
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diaphragm.
[0012]
Further, the edge portion is curved so as to protrude to the other end side of the diaphragm.
[0013]
Further, the beam portion is formed on the upper surface side of the diaphragm on the outer
periphery of the additional plate mounting portion.
[0014]
Further, the beam portion is characterized by comprising an annular annular rib surrounding at
least an outer peripheral portion of the additional plate.
[0015]
Furthermore, the cover member is formed in a substantially rectangular shape, and the beam
portion includes a radial rib extending to the annular rib from at least a side center and a corner
portion of the cover member. .
[0016]
Further, the cover member is formed of a resin having a thickness of 0.2 mm or less.
[0017]
As shown in the above configuration, the electro-acoustic transducer according to the present
invention is configured to be mounted on an external device, but the cover member is formed of
resin, and is opposed to the edge portion of the diaphragm of the cover member. Since the beam
portion is formed on the surface to be formed, the following effects can be obtained.
[0018]
That is, by forming the cover member with resin, when it is arranged in a mobile phone etc., it is
possible to prevent an adverse effect on the antenna which is another electronic component, and
further to form a beam portion to improve the strength of the cover member. Thus, the cover
member made of resin can be formed thin.
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[0019]
As described above, according to the present invention, there is provided an electro-acoustic
transducer configured to be mounted on an external device, which does not adversely affect
other electronic components and which has sufficiently secured durability. be able to.
[0020]
Further, since the edge portion of the diaphragm is curved to project toward the other end side,
that is, the lower surface side of the diaphragm, even if a beam is formed on the edge portion, the
vertical movement is caused by the ringing of the diaphragm. The possibility of the edge portion
interfering with the beam portion can be reduced, and stable acoustic vibration can be obtained.
[0021]
Furthermore, since the beam portion is formed on the upper surface side of the diaphragm on
the outer periphery of the additional plate mounting portion, the additional plate protrudes from
the diaphragm toward the cover member, but the additional plate is added by the vertical
movement accompanying the ringing of the diaphragm. There is no concern that the plate
contacts the beam, and stable acoustic vibration can be obtained.
[0022]
Further, since the beam portion has an annular ring rib so as to surround at least the outer
peripheral portion of the additional plate, it is possible to improve the strength near the center of
the cover member on the upper surface side of the additional plate without the beam portion.
[0023]
Furthermore, it is also possible to apply the cover member of the present invention to an
electroacoustic transducer formed in a substantially square shape.
At that time, by forming the beam portion so as to extend to the annular rib at least from the side
center and the corner portion of the cover member, the strength of the cover member can be
efficiently improved by configuring only a small number of beams. it can.
[0024]
Moreover, the effect of said beam part becomes large by applying this invention to the cover
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member formed with resin 0.2 mm or less in thickness.
[0025]
Hereinafter, embodiments of the present invention will be described using the drawings.
[0026]
FIG. 1 is an exploded perspective view showing an electro-acoustic transducer 10 according to an
embodiment of the present invention.
FIG. 2 is a cross-sectional view of an electro-acoustic transducer 10 according to an embodiment
of the present invention.
[0027]
As shown in these figures, the electro-acoustic transducer 10 according to the present
embodiment is a small-sized electrodynamic speaker, and is used by being incorporated in the
housing of an external device (for example, a cellular phone, an IC recorder, etc.) Is configured.
[0028]
The electro-acoustic transducer 10 is a substantially rectangular electro-acoustic transducer, and
has a rectangular outer shape having a long side of about 11 mm and a short side of about 7
mm, and the vibration plate 12 which is slightly smaller than the outer shape. A voice coil 14
fixed to the lower surface of the plate 12, a magnetic circuit unit 16 in which an annular
magnetic gap is formed to accommodate the lower end of the voice coil 14, a magnetic circuit
unit 16 is contained and fixedly supported. A frame 20 fixedly supporting the outer peripheral
edge of the diaphragm 12 on the upper surface, a pair of terminal plates 18 attached to the
frame 20, and 1 supported by the frame so as to be exposed from the lower end of the frame 20
It comprises a pair of external connection terminals 22 and a cover member 24 fixed to the
frame 20 from the upper surface side of the diaphragm 12.
[0029]
In the electro-acoustic transducer 10, the voice coil 14 and the magnetic circuit unit 16
constitute a conversion unit for performing electro-acoustic conversion via the vibration of the
diaphragm 12.
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[0030]
The frame 20 is an injection-molded product made of synthetic resin and has a substantially
rectangular outer peripheral surface shape, and a circular opening 20D having a diameter
slightly larger than that of the voice coil 14 is formed in the center thereof. ing.
The frame 20 includes a frame bottom portion 20A located around the circular opening 20D, an
upper flange portion 20B extending to the upper surface side of the frame bottom portion 20A,
and a lower flange portion 20C extending to the lower surface side.
[0031]
The upper flange portion 20B has an upper surface formed in a step shape.
That is, on the upper surface of the upper flange portion 20B, the lower half portion 20E is
substantially half of the inner periphery, and the upper quarter portion 20F is a substantially
quarter portion adjacent to the outer peripheral side. The one-half portion is configured as the
middle step portion 20G, and the diaphragm 12 is adhesively supported in the lower portion
20E.
[0032]
The outer peripheral surface of the upper flange portion 20B is formed in a substantially
rectangular shape.
Further, notches 20H which are cut out to the upper surface of the frame bottom 20A are formed
at the center on both left and right sides of the upper flange 20B, and these notches 20H are
formed of a cover member 24 described later. The case fitting portion 24C is bonded.
[0033]
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The outer peripheral surface of the lower flange portion 20C is formed in a substantially
rectangular shape.
Further, the magnetic circuit unit 16 is disposed on the inner side of the lower flange portion
20C, and the magnet 30 is abutted.
[0034]
The diaphragm 12 is formed by subjecting a synthetic resin film such as polyimide or the like to
hot press molding.
A substantially rectangular annular outer peripheral flat surface portion 12A is formed on the
outer peripheral peripheral portion of the diaphragm 12, and an edge portion 12B is formed on
the inner peripheral side of the outer peripheral flat surface portion 12A.
And this edge part 12B is formed so that it may bulge out like a ring surface toward the lower
surface side.
Further, on the inner peripheral side of the edge portion 12B, a substantially planar central flat
portion 12C is formed.
[0035]
The diaphragm 12 is bonded to the lower portion 20E of the upper flange portion 20B of the
frame 20 at its outer peripheral flat surface portion 12A, and to the upper end of the voice coil
14 at its central flat surface portion 12C.
[0036]
Each of the pair of terminal plates 18 is formed as a processed product of a metal plate, and is
integrally formed with the frame 20 by insert molding.
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Each terminal plate 18 is a land portion exposed flush with the upper surface of the frame
bottom portion 20A at a position adjacent to the short side of the frame bottom portion 20A of
the frame 20, and It is integrally formed with the external connection terminal 22 exposed to the
side surface.
[0037]
The voice coil 14 is cylindrically wound and disposed in the circular opening 20D of the frame
20.
The pair of coil terminals extending from the upper end of the voice coil 14 is conductively fixed
to the pair of terminal plates 18 by thermocompression bonding.
[0038]
Each of the pair of external connection terminals 22 is a flat plate-shaped terminal member made
of metal, and is disposed in the vicinity of the pair of terminal plates 18.
[0039]
The magnetic circuit unit 16 includes a base 28 made of a magnetic material such as iron, a
magnet 30, and a yoke 32 made of a magnetic material such as iron.
[0040]
The base 28 is formed in a short cylindrical shape with a short bottom.
The magnet 30 and the yoke 32 are both formed in a disk shape, and are placed on the bottom
surface of the base 28 so as to be concentric with each other in this order and are sequentially
bonded.
Thus, between the outer peripheral surface of the yoke 32 and the inner peripheral surface of the
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base 28, a cylindrical magnetic gap for housing the lower end portion of the voice coil 14 is
formed with the same width all around.
[0041]
A plurality of through holes 28A vertically penetrating through the bottom surface of the base 28
are formed on the bottom surface of the base 28 at predetermined intervals in the
circumferential direction.
[0042]
The magnetic circuit unit 16 is attached to the frame 20 by adhering the upper end of the base
28 to the circular opening 20D of the frame 20 in a state of being fitted from the lower surface
side.
[0043]
FIG. 3 is a perspective view of the cover member 24 viewed from the lower surface side.
FIG. 4 is an exploded perspective view showing a part of the electroacoustic transducer 10
according to an embodiment of the present invention.
In addition, since FIG.3 and FIG.4 is a figure represented from the lower surface side, the upper
side of a figure becomes a lower surface side, and the lower side is an upper surface side.
[0044]
As shown in FIGS. 3 and 4, the cover member 24 is an injection-molded article made of synthetic
resin, and comprises a cover main body 24A, a sound output hole 24B, a case fitting portion 24C,
an outer peripheral surface 24D, and a rib 25. ing.
[0045]
The cover main body 24A is formed in a substantially rectangular shape in a plan view, and has
an outer peripheral surface 24D substantially the same outer shape as the frame 20.
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In the cover main body 24A, the upper surface side of the cover main body 24A is formed in the
shape of a horizontal surface, and two sound output holes 24B are formed in the vicinity of the
approximate center.
[0046]
The lower surface side of the cover main body 24A is formed with a plurality of ribbed ribs 25
having a thickness of about 0.15 mm, and extends from the outer peripheral rib 25A to the
central portion from the outer peripheral rib 25A adjacent to the outer peripheral side A plurality
of radial ribs 25B and an annular rib 25C formed on the further inner circumferential side of the
radial ribs 25B.
[0047]
Further, on the further outer peripheral side of the outer peripheral rib 25A, an outer peripheral
surface 24D for ultrasonic welding with the upper end portion 20F of the frame 20 is annularly
formed.
When the frame 20 and the cover member 24 are ultrasonically welded in the assembly of the
electroacoustic transducer 10, the upper portion 20F is welded to the outer peripheral surface
24D, and the cover member 24 is fixed to the frame 20.
[0048]
Furthermore, a case fitting portion 24C for positioning with the frame 20 is provided on a part of
the outer peripheral surface 24D.
The case fitting portion 24 </ b> C is a substantially square protruding member protruding from
the cover main body 24 </ b> A, and is fitted in the notch portion 20 </ b> H formed in the frame
20.
[0049]
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In addition, the site | part in which the ribs 25 of the outer peripheral surface 24D etc. of the
cover main body 24A are not formed is set to about 0.2 mm in thickness.
[0050]
First, the outer peripheral rib 25A is provided on the upper surface side of the lower portion 20E
which is the movable outer side of the diaphragm 12.
Thereby, even if the diaphragm 12 operates, it does not interfere with the outer peripheral rib
25A.
[0051]
Next, the radial ribs 25B extend from a total of eight locations toward the central portion of the
cover main body 24A from near the centers of the four corners and four sides of the
substantially rectangular cover main body 24A.
Further, an edge portion 12B is formed on the lower surface side of the radial rib 25B.
Since this edge portion 12B is bulged in the form of a torus toward the lower surface side, the
radiation rib 25B and the diaphragm 12 do not interfere with each other even when the
diaphragm 12 operates. There is.
[0052]
The annular rib 25C is a track-like rib member disposed slightly outside of the outer peripheral
upper surface of the additional plate 12D.
The edge portion 12B is disposed on the lower surface side of the annular rib 25C, and is
configured such that interference with the diaphragm 12 does not occur as in the case of the
radial rib 25B.
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Further, since the annular rib 25C is disposed slightly outside the additional plate 12D bonded to
the upper surface side of the diaphragm 12 as shown by the broken line in FIG. 4, the annular rib
25C does not interfere with the additional plate 12D.
Furthermore, the annular rib 25C is formed in an annular shape, and the strength of the central
portion of the cover main body 24A without beams can also be secured.
[0053]
As described above in detail, the electroacoustic transducer 10 according to the present
embodiment is configured to be mounted on an external device, but the cover member 24 is
formed of resin, and the diaphragm 12 of the cover member 24 is further provided. Since the rib
25 is formed on the surface facing the edge portion 12B of the second embodiment, the
following effects can be obtained.
[0054]
That is, by forming the cover member 24 with a resin, when it is arranged in a mobile phone etc.,
it is possible to prevent an adverse effect on the antenna which is another electronic component,
and further, a rib 25 is formed to make the strength of the cover member 24 By improving the
thickness, the resin cover member 24 can be formed thin.
[0055]
As described above, according to the present invention, there is provided an electro-acoustic
transducer configured to be mounted on an external device, which does not adversely affect
other electronic components and which has sufficiently secured durability. be able to.
[0056]
Further, since the edge portion 12B of the diaphragm 12 is curved so as to protrude to the other
end side, that is, the lower surface side of the diaphragm 12, the radial rib 25B, the annular rib
25C, etc. are formed on the upper surface side of the edge portion 12B. Even if the rib 25 is
formed, the possibility of the edge portion 12B interfering with the rib 25 due to the vertical
movement accompanying the ringing of the diaphragm 12 can be reduced, and stable acoustic
vibration can be obtained.
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[0057]
Furthermore, since the rib 25 is formed on the diaphragm 12 on the outer peripheral side on
which the additional plate 12D is mounted, the additional plate 12D protrudes from the
diaphragm 12 to the cover member 24 side. Due to the up and down movement accompanying
the ringing, there is no concern that the additional plate 12D contacts the rib 25, and stable
acoustic vibration can be obtained.
[0058]
Further, since the rib 25 has an annular ring rib 25C so as to surround the outer peripheral
portion of the additional plate 12D, particularly the release in the vicinity of the center of the
cover member 24 on the upper surface side of the additional plate 12D where the rib 25 is not
formed. The strength around the sound hole 24B can be improved.
[0059]
Furthermore, it is also possible to apply the cover member 24 of the present invention to the
electroacoustic transducer 10 formed in a substantially square shape.
At that time, the radial rib 25B is extended to the annular rib 25C from the side center and the
corner portion of the cover member 24, so that the strength of the cover member 24 can be
efficiently achieved only by configuring the few radial ribs 25B. It can be improved.
[0060]
Further, in the above embodiment, the electro-acoustic transducer 10 is described as an
electrodynamic speaker, but in the case of other electro-acoustic transducers (for example,
receiver etc.), the same as the above embodiment By adopting the configuration, it is possible to
obtain the same effect as that of the above embodiment.
[0061]
The numerical values shown as specifications in the above embodiment are merely examples, and
of course these may be set to different values as appropriate.
[0062]
An exploded perspective view showing the electro-acoustic transducer 10 according to an
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embodiment of the present invention A cross-sectional view of the electro-acoustic transducer 10
according to an embodiment of the present invention An exploded perspective view showing a
part of the electroacoustic transducer 10 according to the embodiment
Explanation of sign
[0063]
DESCRIPTION OF SYMBOLS 10 electro-acoustic transducer 12 diaphragm 12A outer periphery
plane part 12B edge part 12C center plane part 12D addition plate 14 voice coil 16 magnetic
circuit unit 18 terminal plate 20 frame 20A frame bottom part 20B upper flange part 20C lower
flange part 20D circular opening Part 20E Lower part 20F Upper part 20G Middle part 20H
Notched part 22 External connection terminal 24 Cover member 24A Cover body 24B Sound
release hole 24C Case fitting part 24D Outer peripheral surface 25 Rib 25A Outer peripheral rib
25B Radial rib 25C Annular rib 28 Base 28A through hole 30 magnet 32 yoke
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