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JP2016072800

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DESCRIPTION JP2016072800
Abstract: To provide an electro-acoustic transducer that is thin and can easily obtain a large
output. A thin box-like air chamber 100 sealed inside, a first piezoelectric sound element 310 for
closing a first attachment hole 111 formed on a first main surface of the air chamber 100, a first
piezoelectric sound element 310 for the air chamber 100 A second piezoelectric sound element
320 for closing the second attachment hole 122 formed on the two main surfaces and facing the
first attachment hole 111, and the sound generation by the first piezoelectric sound element 310
to the side of the air chamber 100 A first sound introducing member 210 in which a first sound
introducing path is formed, and a second sound introducing member in which a second sound
introducing path is formed which guides sound generation by the second piezoelectric sound
element 320 in the same direction as the first sound introducing path. The first piezoelectric
sound emitting element 310 and the second piezoelectric sound emitting element 320 are
configured to receive an audio signal so that the side-directed sound generation has the same
phase. [Selected figure] Figure 2
Electro-acoustic transducer
[0001]
The present invention relates to an electroacoustic transducer provided with a piezoelectric
sounding element.
[0002]
Heretofore, as this type of electroacoustic transducer, for example, one described in Patent
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Document 1 is known.
The thing of patent document 1 arrange | positions several piezoelectric sound element in the
box-shaped housing | casing. The piezoelectric sound emitting elements are arranged so as to be
parallel to the upper surface of the housing, and so that the plurality of piezoelectric sound
emitting elements are partially overlapped with each other when viewed in the thickness
direction so as to have a staggered cross section. Also, a number of sound emission holes are
provided on the upper surface of the housing for transmitting the sound generation of the
piezoelectric sound generation element to the outside.
[0003]
JP, 2012-100054, A
[0004]
However, in the case of Patent Document 1, in order to secure the sound pressure and reduce the
volume of the housing, a plurality of piezoelectric sounding elements are arranged so as to have
a zigzag cross section, so it is difficult to reduce the thickness. There is a problem of
In addition, in the case of performing the stereo reproduction in the one described in Patent
Document 1, it is sufficient to divide the plurality of piezoelectric sounding elements into two
groups and input the right or left audio signal respectively, but the two groups are adjacent to
each other There is also the problem that it is difficult to separate the left and right sounds.
[0005]
The present invention has been made in view of the above circumstances, and a first object of the
present invention is to provide an electro-acoustic transducer which is thin and can easily obtain
a large output. A second object of the present invention is to provide an electroacoustic
transducer capable of obtaining high stereo feeling with one device.
[0006]
In order to achieve the above object, according to the present invention, a thin box-like air
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chamber sealed inside, a first piezoelectric sounding element for closing a first attachment hole
formed on a first main surface of the air chamber, and A second piezoelectric sound element for
closing a second mounting hole formed at a position opposite to the first mounting hole, which is
the second main surface of the air chamber facing the first main surface, and attached to the first
main surface of the air chamber And a first sound-conduction member having a first soundconduction path formed to guide the sound generation by the first piezoelectric soundproduction element to the side of the air chamber, and a second piezoelectric sound-emission
element attached to the second main surface of the air chamber And a second sound-conduction
member having a second sound-conduction path formed in the same direction as the first soundconduction path, and the first piezoelectric sound-production element and the second
piezoelectric sound-production element are laterally guided We propose a system characterized
in that it is configured to input an audio signal so that the pronunciation is in phase.
[0007]
According to the present invention, since the sound generation of the first and second
piezoelectric sound elements is emitted to the side of the air chamber, it is possible to make the
device thinner.
Further, the first piezoelectric sound element and the second piezoelectric sound element are
disposed to face each other in the thin box-like closed air chamber, and the first piezoelectric
sound element and the second piezoelectric sound led to the side Since the original sound
generation is in phase, a large output can be easily obtained.
[0008]
As an example of a preferred aspect of the present invention, the first sound conducting member
is formed of a plate-like member, and faces the air chamber from the first piezoelectric element
on the surface facing the first main surface of the air chamber. The second sound introducing
member is formed of a plate-like member and has a second piezoelectric element on a surface
facing the second main surface of the air chamber from the air chamber. The invention is
characterized in that a concave portion forming a second sound guide path is formed toward the
side of Here, it is preferable in terms of sound quality and sound volume that the recessed
portion is not parallel to the two side surfaces facing each other in the direction orthogonal to
the direction toward the side of the air chamber. Preferably, the recess is formed wider toward
the side of the air chamber.
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[0009]
Further, as an example of a preferable aspect of the present invention, a reflecting member for
guiding the sound output from the second sound introducing path in the direction of the first
main surface of the air chamber is provided on the side of the second sound introducing member
And those characterized by According to the present invention, the volume can be increased in
the thickness direction of the device.
[0010]
Moreover, as an example of the suitable aspect of this invention, it is the 1st main surface of the
said air chamber, and the 3rd formed in the position which becomes object with the said 1st
attachment hole on the basis of the center of this 1st main surface. A third piezoelectric sounding
element closing the mounting hole; and a fourth piezoelectric sounding element closing the
fourth mounting hole formed on the second main surface of the air chamber at a position facing
the third mounting hole; In the first sound guide member, a third sound guide path for guiding
the sound generation by the third piezoelectric sound element is formed on the side of the air
chamber different from the sound guide direction by the first sound guide path, and the second
sound guide The member is characterized in that a fourth sound conduction path is formed for
guiding the sound generation by the fourth piezoelectric sound element in the same direction as
the third sound conduction path. According to the present invention, since the sound generation
by the first and second piezoelectric sound elements and the sound generation by the third and
fourth piezoelectric sound elements are output to the air chamber in different directions, it is
possible to reproduce the stereo sound signal. It is suitable.
[0011]
As described above, according to the present invention, since the sound generation of the first
and second piezoelectric sound elements is emitted to the side of the air chamber, the device can
be thinned. Further, the first piezoelectric sound element and the second piezoelectric sound
element are disposed to face each other in the thin box-like closed air chamber, and the first
piezoelectric sound element and the second piezoelectric sound led to the side Since the original
sound generation is in phase, a large output can be easily obtained.
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[0012]
External perspective view of the electroacoustic transducer-exploded perspective view of the
electroacoustic transducer-Cross section of the electroacoustic transducer-Illustration of the
operation of the electroacoustic transducer-Cross section of the electroacoustic transducer
according to another example
[0013]
An electroacoustic transducer according to an embodiment of the present invention will be
described with reference to the drawings.
FIG. 1 is an external perspective view of the electro-acoustic transducer, FIG. 2 is an exploded
perspective view of the electro-acoustic transducer, and FIG. 3 is a cross-sectional view of the
electro-acoustic transducer.
[0014]
The electro-acoustic transducer 1 includes a thin box-like air chamber 100 sealed inside, a platelike first sound introducing member 210 attached to one main surface (upper surface) of the air
chamber 100, and the air chamber 100. And a plate-like second sound introducing member 220
attached to the other main surface (bottom surface) of
[0015]
The air chamber 100 is provided with a top plate 110 on the first sound introducing member
210 side, a bottom plate 120 on the second sound introducing member 220 side, and a frame
plate 130 that forms a square measuring plate of the air chamber 100.
In the top plate 110, rectangular attachment holes 111 and 113 for attaching a piezoelectric
sounding element to be described later are formed. The mounting holes 111 and 113 are formed
at positions to be targeted with respect to the center of the top plate 110. Similarly, the bottom
plate 120 is formed with rectangular attachment holes 122 and 124 for attaching the
piezoelectric sound element. The mounting holes 122 and 124 are formed at a target position
with respect to the center of the bottom plate 120. Here, the mounting holes 111 formed in the
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top plate 110 and the mounting holes 122 formed in the bottom plate 120 are such that they
overlap when viewed in the thickness direction, that is, both are opposed to each other in
position and shape It is formed. Similarly, the mounting holes 113 formed in the top plate 110
and the mounting holes 124 formed in the bottom plate 120 overlap each other in the thickness
direction, that is, in a position and shape in which both are opposed to each other. It is formed.
[0016]
A first piezoelectric sound element 310 is attached to the mounting hole 111 of the top plate
110. Further, a third piezoelectric sound element 330 is attached to the attachment hole 113 of
the top plate 110. Similarly, a second piezoelectric sound element 320 is attached to the
attachment hole 112 of the bottom plate 120. Further, a fourth piezoelectric sound element 340
is attached to the attachment hole 114 of the bottom plate 120.
[0017]
Each piezoelectric sound element 310, 320, 330, 340 includes a piezoelectric element body 311,
321, 331, 341 including a piezoelectric ceramic laminate and a diaphragm, and the piezoelectric
element body 311, 321, 331, 341 on one side. Support plates 312, 322, 332 and 342 are
provided. Each of the piezoelectric sound emitting elements 310, 320, 330, and 340 vibrates in
the thickness direction in a bending mode when a signal is applied.
[0018]
The edge portions of the support plates 312, 322, 332, 342 are bonded to the inner side of the
air chamber 100 at the periphery of the mounting holes 111, 112, 113, 114, respectively. ing.
Here, the piezoelectric element bodies 311, 321, 331, 341 of the piezoelectric sound emitting
elements 310, 320, 330, 340 are disposed inside the air chamber 100.
[0019]
Each of the sound guiding members 210 and 220 is a plate-like member having the same vertical
and horizontal dimensions as the top plate 110 and the bottom plate 120, and guides the sound
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generation of the piezoelectric sound elements 310, 320, 330, and 340 to the sides of the air
chamber 100, respectively. The recessed part 211, 213, 222, 223 which comprises the soundconduction path for is formed. The recess 211 of the first sound introducing member 210 is
formed at a position facing the first piezoelectric sound element 310. The concave portion 213 of
the first sound introducing member 210 is formed at a position facing the third piezoelectric
sound element 330. The directions of sound conduction by the concave portion 211 and the
concave portion 213 are opposite (in this embodiment, 180 °). Similarly, the recess 222 of the
second sound introducing member 220 is formed at a position facing the second piezoelectric
sound element 320. The concave portion 224 of the second sound conducting member 220 is
formed at a position facing the fourth piezoelectric sound element 340. The directions of sound
conduction by the concave portion 222 and the concave portion 224 are opposite to each other.
Moreover, the direction of the sound conduction by the recessed part 211 and the recessed part
222 is the same. Similarly, the directions of sound conducted by the recess 213 and the recess
224 are the same.
[0020]
In each of the concave portions 211, 213, 222, and 224, two side surfaces facing each other in a
direction orthogonal to the direction toward the side of the air chamber 100 are not parallel.
Preferably, each recess 211, 212, 221, 222 is formed wider toward the side of the air chamber
100, that is, toward the end of each sound introducing member 210, 220. In the present
embodiment, each of the concave portions 211, 212, 221 and 222 has a trapezoidal shape, but
may have another shape such as a trumpet shape.
[0021]
Further, the electroacoustic transducer 1 according to the present embodiment is provided with
the reflection plates 401 and 402 for guiding the air conducted sound outputted to the side of
the air chamber 100 to the one main surface side. The angle between the reflection plates 401
and 402 and the main surface of the air chamber 100 is arbitrary, for example, 45 °. It should
be noted that the reflectors 401 and 402 are not essential.
[0022]
In the electro-acoustic transducer 1 according to the present embodiment, the same sound signal
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(for example, the left channel signal of the stereo sound signal) is used for the first piezoelectric
sound element 310 and the second piezoelectric sound element 320. Similarly, the same sound
signal (for example, the right channel signal of a stereo sound signal) for the third piezoelectric
sound element 330 and the fourth piezoelectric sound element 340. Here, when the same sound
signal is input to the first piezoelectric sounding element 310 and the second piezoelectric
sounding element 320, the sounds led to the side become the same phase. That is, as shown in
FIG. 4, when the same sound signal is input to the first piezoelectric sound element 310 and the
second piezoelectric sound element 320, when the first piezoelectric sound element 310 vibrates
as shown by a solid line and a dotted line, The second piezoelectric sound element 320 also
vibrates as shown by a solid line and a dotted line. The same applies to the third piezoelectric
sound element 330 and the fourth piezoelectric sound element 340.
[0023]
According to the electro-acoustic transducer 1 according to the present embodiment, since the
sound generation of each of the piezoelectric sound elements 310, 320, 330, and 340 is emitted
to the side of the air chamber 100, the device can be thinned. It becomes possible. Also, in the
thin box-like closed air chamber 100, the first piezoelectric sound element 310 and the second
piezoelectric sound element 320 are arranged, and the third piezoelectric sound element 330
and the fourth piezoelectric sound element 340 are arranged to face each other. Since the sidedirected sound generation is in phase, a large output can be easily obtained. Further, according to
the electro-acoustic transducer 1, the sound quality (frequency characteristics) can be easily
adjusted by adjusting the thickness of the air chamber 100, that is, the height of the frame plate
130.
[0024]
Further, according to the electro-acoustic transducer 1 according to the present embodiment, the
sound generation by the first piezoelectric sound element 310 and the second piezoelectric
sound element 320 and the sound sound by the third piezoelectric sound element 330 and the
fourth piezoelectric sound element 340 Since the signals are outputted in mutually different
directions (180 ° in the present embodiment), they are suitable for reproduction of stereo audio
signals. Furthermore, according to the electro-acoustic transducer 1 according to the present
embodiment, since the sound is output in the thickness direction of the electro-acoustic
transducer 1 by the reflecting plates 401 and 402, the freedom of installation is improved.
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[0025]
As mentioned above, although one embodiment of the present invention was explained in full
detail, the present invention is not limited to this. For example, in the above embodiment, the
electro-acoustic conversion device 1 that outputs audio signals of two channels is described in
detail, but by omitting the third piezoelectric sound element 330 and the fourth piezoelectric
sound element 340, one channel sound can be obtained. It may output a signal.
[0026]
Further, as shown in FIG. 5, the air chamber 100 is divided into the first piezoelectric sound
element 310 and the second piezoelectric sound element 320 side, and the third piezoelectric
sound element 330 and the fourth piezoelectric sound element 340 side, A partition wall 190
may be provided to divide 100 into two. This also improves the separation of the left and right of
the stereo audio signal.
[0027]
DESCRIPTION OF SYMBOLS 1 ... Electroacoustic transducer, 100 ... Air chamber, 110 ... Top plate,
120 ... Bottom plate, 130 ... Frame plate, 210, 220 ... Sound-conduction member, 310, 320, 330,
340 ... Piezoelectric sounding element, 401, 402 ... reflector
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