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DESCRIPTION JPWO2015115608

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DESCRIPTION JPWO2015115608
Abstract: PROBLEM TO BE SOLVED: To provide a composite electronic device capable of easily
generating high-quality sound, and a speaker cartridge and an electronic device used therefor.
SOLUTION: A composite electronic device has an electronic device 38 and a speaker cartridge
26. The speaker cartridge 26 includes a vibrating body 12 a, an exciter 11, a first housing 10,
and a first connector 20. The vibrating body 12a has a first main surface 12b and a second main
surface 12c, and a first space 21a is formed by the first main surface 12b and the first housing
10, and the second main surface 12c and the first housing The second space 21 b is formed at
10. The electronic device 38 has an electronic circuit 60, a second housing 25, and a second
connector 30, and a third space 31 surrounded by the second housing 25 is formed. The exciter
11 and the electronic circuit 60 are electrically connected to each other, and the first space 21 a
and the external space are connected to each other through the first opening 22 of the first
housing 10, and to the second opening of the first housing 10. Thus, the second space 21b and
the third space 31 are connected. [Selected figure] Figure 2
Composite electronic device, speaker cartridge and electronic device
[0001]
The present invention relates to a composite electronic device, a speaker cartridge, and an
electronic device.
[0002]
Conventionally, there is known an electronic device in which a speaker for vibrating a diaphragm
to which a piezoelectric element is attached to generate sound is mounted in a housing (see, for
example, Patent Document 1).
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[0003]
JP, 2013-192175, A
[0004]
However, in the electronic device described above, the diaphragm is disposed inside the case of
the electronic device and is surrounded by the case of the electronic device.
As a result, the sound generated from the diaphragm is reflected inside the housing of the
electronic device to cause resonance, so the sound quality of the sound radiated from the
electronic device to the outside largely depends on the structure inside the housing of the
complex electronic device. It had been.
For this reason, in order to improve the sound quality of the sound generated from the electronic
device, it is very difficult to design the sound in a complex electronic device having a low degree
of freedom, which is very difficult.
[0005]
The present invention has been made in view of the problems in the prior art as described above,
and its object is to provide a composite electronic device capable of easily generating highquality sound, a speaker cartridge used therefor, and It is in providing an electronic device.
[0006]
A composite electronic device according to the present invention includes an electronic device
and a speaker cartridge detachably connected to the electronic device, the speaker cartridge
including a vibrating body, and an exciter attached to the vibrating body. A first housing
surrounding and containing the vibrator and a first connector electrically connected to the
exciter, wherein the vibrators are surfaces opposite to each other A first space having a first main
surface and a second main surface, and a first space surrounded by the first main surface of the
vibrator and the first casing, and the second main surface of the vibrator The electronic device
has an electronic circuit, a second connector connected to the electronic circuit, and a second
housing. And the second housing has a third space inside, and the first connector and the second
connector Are connected, the exciter and the electronic circuit are electrically connected, and a
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first opening is provided in a portion of the first housing in contact with the first space; An
external space is connected via the first opening, and a second opening is provided in a portion
of the first housing in contact with the second space, and the second space and the third space
are provided. Are connected via the second opening.
[0007]
A speaker cartridge according to the present invention includes a vibrator, an exciter attached to
the vibrator, a first housing that encloses the vibrator and is accommodated therein, and a first
electrically connected to the exciter. A connector, and the vibrator has a first main surface and a
second main surface which are surfaces opposite to each other, and the first main surface and
the first casing of the vibrator are provided. A first space surrounded by the body, a second space
surrounded by the second main surface of the vibrator and the first casing, and a portion of the
first casing in contact with the first space It has the provided 1st opening, and the 2nd opening
provided in the portion which touches the 2nd space in the 1st case.
[0008]
An electronic device according to the present invention includes an electronic circuit, a second
connector connected to the electronic circuit, and a second housing, and the second housing is
provided with a third space provided therein. And a third opening in contact with the third space.
[0009]
The composite electronic device of the present invention can easily generate high-quality sound.
The speaker cartridge of the present invention can easily realize a composite electronic device
that generates high-quality sound.
The electronic device of the present invention can easily realize a composite electronic device
that generates high-quality sound.
[0010]
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It is a perspective view which shows typically the speaker cartridge of 1st Embodiment of this
invention.
It is the sectional view on the AB line of FIG.
It is the top view seen from the + z direction which shows typically the state which removed the
panel 17 of the speaker cartridge of 1st Embodiment of this invention.
It is the top view seen from + z direction which shows typically the state which removed the
panel 17 and the spacer 15 of the speaker cartridge of 1st Embodiment of this invention. It is the
top view seen from the-z direction which shows typically the speaker cartridge of 1st
Embodiment of this invention. It is the top view seen from the-z direction which shows typically
the state which removed the panel 18 of the speaker cartridge of 1st Embodiment of this
invention. It is the top view seen from the-z direction which shows typically the state which
removed the panel 18, the spacer 16, and the resin layer 13 of the speaker cartridge of 1st
Embodiment of this invention. It is a perspective view which shows typically the speaker
cartridge of 2nd Embodiment of this invention. It is a top view which shows typically the speaker
cartridge of 2nd Embodiment of this invention. It is a perspective view which shows typically the
speaker cartridge of 3rd Embodiment of this invention. It is a perspective view which shows
typically the state which removed the reflector 24 of the speaker cartridge of 3rd Embodiment of
this invention. It is a top view which shows typically the speaker cartridge of 3rd Embodiment of
this invention. It is the top view seen from the + z direction side which shows typically the
composite electronic device of 4th Embodiment of this invention. It is the top view seen from the
+ x direction side which shows typically the composite electronic device of 4th Embodiment of
this invention. It is sectional drawing which shows typically a part of composite electronic device
of 4th Embodiment of this invention. It is a top view which shows typically the composite
electronic device of 5th Embodiment of this invention. It is a top view which shows typically the
composite electronic device of 6th Embodiment of this invention. It is a top view which shows
typically the composite electronic device of 7th Embodiment of this invention. It is a top view
which shows typically the composite electronic device of 8th Embodiment of this invention. It is
sectional drawing which shows typically a part of composite electronic device of 8th Embodiment
of this invention. It is a graph which shows the frequency characteristic of the sound pressure
level in the sound which generate | occur | produces from the composite electronic device of 5th
Embodiment of this invention.
[0011]
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Hereinafter, a composite electronic device, a speaker cartridge, and an electronic device
according to an embodiment of the present invention will be described in detail with reference to
the attached drawings. In the drawings, directions are indicated using x-axis, y-axis, and z-axis
orthogonal to each other.
[0012]
(First Embodiment) FIG. 1 is a perspective view schematically showing a speaker cartridge
according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view taken
along line A-B of FIG. 3 and 4 are plan views seen from the + z direction schematically showing
the speaker cartridge of the first embodiment of the present invention. 3 shows a state in which
the panel 17 is removed, and FIG. 4 shows a state in which the panel 17 and the spacer 15 are
removed. 5 to 7 are plan views, as seen from the -z direction, schematically showing the speaker
cartridge of the first embodiment of the present invention. 6 shows a state in which the panel 18
is removed, and FIG. 7 shows a state in which the panel 18, the spacer 16 and the resin layer 13
are removed.
[0013]
As shown in FIGS. 1 to 7, the speaker cartridge according to the present embodiment includes
the exciter 11, the film 12, the resin layer 13, the frame 14a and the frame 14b, the spacer 15
and the spacer 16, the panel 17 and the panel 18 and a first connector 20.
[0014]
The frame 14a and the frame 14b each have a rectangular frame shape.
For example, the frame 14a and the frame 14b can be suitably made of stainless steel having a
thickness of 100 to 1000 μm, but the material and thickness are not particularly limited, and
deformation is more difficult than the film 12 and the resin layer 13 Anything is fine. For
example, the frame 14a and the frame 14b can be formed using hard resin, plastic, engineering
plastic, ceramics or the like.
[0015]
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The film 12 has a film-like (thin plate-like) shape, and can be formed using, for example, a resin
such as PET (polyethylene terephthalate) or polyimide. The thickness of the film 12 is, for
example, 10 to 200 μm. Then, in a state where tension is applied to the film 12 in the surface
direction (x-axis direction and y-axis direction), the peripheral portions of the upper and lower
main surfaces (both end surfaces in the z-axis direction) are sandwiched by the frame 14a and
the frame 14b. It is fixed and vibratably supported by the frame 14a and the frame 14b. A
vibrating body 12a that can freely vibrate is configured by a portion of the film 12 located inside
the frames 14a and 14b and not sandwiched by the frames 14a and 14b. That is, the vibrating
body 12a has a rectangular flat (film) shape. The vibrating body 12a also has a first major
surface 12b that is a surface on the + z direction side and a second major surface 12c that is a
surface on the −z direction side.
[0016]
The shapes of the frame 14a and the frame 14b are not limited to the rectangular shape, and
may be circular or rhombus. When the frame 14b is not provided, for example, the film 12 may
be adhered to the surface of the frame 14a in the + z direction, and when the frame 14a is not
provided, for example, the -z direction of the frame 14b. The film 12 may be adhered to the
surface of the film. In addition, since the vibrating body 12a may have a flat shape (a shape
having a small thickness and a large area), that is, a thin plate shape or a film shape, it is vibrated
by a thin plate metal, paper or the like instead of the film 12. Body 12a can be configured.
[0017]
The exciter 11 is attached to the second main surface 12c of the vibrating body 12a and
integrated with the vibrating body 12a. The exciter 11 is a piezoelectric element having a platelike shape whose upper and lower main surfaces (both end surfaces in the z-axis direction) are
rectangular. Although not shown in detail, the exciter 11 is a laminate formed by alternately
laminating piezoelectric layers made of piezoelectric ceramic and internal electrode layers, and
upper and lower surfaces (both end surfaces in the z-axis direction) of the laminate. And a pair of
terminal electrodes respectively provided on both end faces in the longitudinal direction (x-axis
direction) of the laminate. The surface electrodes and the internal electrode layers are alternately
drawn out to both end surfaces in the longitudinal direction (x-axis direction) of the laminate, and
are connected to the terminal electrodes, respectively. Then, an electrical signal is applied to the
pair of terminal electrodes through a wire (not shown).
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[0018]
The exciter 11 is a bimorph-type piezoelectric element, and when an electrical signal is input,
expansion and contraction are reversed between one side and the other side in the thickness
direction (z-axis direction) at any moment. It has been Therefore, when an electrical signal is
input, the exciter 11 bends and vibrates in the z-axis direction, and vibrates itself to vibrate the
vibrating body 12a. And sound is generated by vibrating the vibrating body 12a.
[0019]
In addition, as the exciter 11, for example, a monomorph type vibration element may be used in
which a piezoelectric element that is input to an electric signal and vibrates in a stretching
manner is bonded to a metal plate. In addition, the main surface on the film 12 side of the exciter
11 and the film 12 are bonded by a known adhesive such as epoxy resin, silicone resin, polyester
resin, double-sided tape, or the like.
[0020]
The resin layer 13 is formed over the entire inside of the frame 14 a so as to embed the exciter
11, and is integrated with the vibrating body 12 a and the exciter 11. The resin layer 13 can be
formed using various known materials. For example, resin such as acrylic resin and silicone resin,
or rubber can be used. Further, the thickness of the resin layer 13 is preferably such a thickness
as to completely cover the exciter 11, but it may be formed so as to cover at least a part of the
film 12. Although the resin layer 13 has the effect of enhancing the sound quality of the sound
generated from the speaker cartridge, it is not essential, and may not be necessary in some cases.
[0021]
The spacer 16 is bonded to the surface of the frame 14 a in the −z direction. The spacer 16 has
the same shape (rectangular frame shape) as the frame 14a, and has the same dimensions as the
frame 14a except that the thickness (dimension in the z-axis direction) is large. The spacer 15 is
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bonded to the surface of the frame 14 b in the + z direction. The spacer 15 has a shape in which
one side in the + x direction is removed from the same rectangular frame shape as the frame 14
b, that is, a shape like “U” of an alphabet.
[0022]
The panel 17 has a rectangular flat plate shape, and the periphery of the main surface on the −z
direction side is joined to the surface on the + z direction side of the spacer 15. A first space 21a
is formed by the first main surface 12b of the vibrating body 12a, the frame 14b, the spacer 15,
and the panel 17. A rectangular first opening 22 surrounded by the frame 14b, the spacer 15,
and the panel 17 is formed at the end of the first space 21a on the + x direction side, and the first
space 21a and the outside are formed. A space is connected via the first opening 22.
[0023]
The panel 18 has a rectangular flat plate shape, and the periphery of the main surface on the + z
direction side is joined to the surface on the −z direction side of the spacer 16. A second space
21 b is formed by the second main surface 12 c of the vibrating body 12 a, the frame 14 a, the
spacer 16, and the panel 18. In addition, a plurality of through holes 23 are formed in a row in a
portion near the −x direction side of the panel 18. A plurality of through holes 23 constitute a
second opening connected to the second space 21 b.
[0024]
As described above, a first case surrounding the vibrating body 12 a by the portion of the film 12
sandwiched by the frame 14 a and the frame 14 b, the frame 14 a and the frame 14 b, the spacer
15 and the spacer 16, and the panel 17 and the panel 18. 10 are configured. The first housing
10 has a rectangular box-like shape.
[0025]
Such spacers 15 and the spacers 16 and the panels 17 and 18 can be formed using various
materials such as resin, metal, ceramics, glass, wood and the like. Also, the spacers 15 and 16
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and the panels 17 and 18 are not limited to the rectangular shape as long as they have the
function of forming the first space 21a and the second space 21b together with the vibrating
body 12a. For example, it may be another shape such as a hexagonal shape or an elliptical shape.
[0026]
The first connector 20 is attached to the end of the first housing 10 in the −x direction, and is
connected to the exciter 11 by a wire (not shown). Then, when the speaker cartridge is inserted
into the electronic device, the connector provided in the electronic device and the first connector
20 are connected, whereby the speaker cartridge and the electronic device are electrically
connected. The first connector 20 only needs to have a function of electrically connecting the
speaker cartridge and the electronic device, and various known connectors can be used as the
first connector 20.
[0027]
In addition, a bonding portion 34 is provided in the first housing 10. The joint portion 34 is
provided at the end of the first housing 10 in the −x direction, and has a bar-like shape in which
the end in the −x direction is expanded. The bonding portion 34 is used to detachably bond the
first housing 10 to the electronic device.
[0028]
The speaker cartridge according to the present embodiment is, for example, the electronic device
from the −x direction side where the first connector 20 is provided so that only the surface on
the + x direction side of the first housing 10 is exposed to the outside of the electronic device. Is
inserted into the slot etc. As a result, the first opening 22 is exposed to the outside of the
electronic device, and the second opening formed by the plurality of through holes 23 is
connected to the internal space of the electronic device. Then, an electrical signal from the
electronic device is supplied to the exciter 11 through the first connector 20 and a wire (not
shown), the exciter 11 vibrates, and the vibration of the exciter 11 vibrates the vibrating body
12a to produce an acoustic signal. Occurs. The sound generated on the first main surface 12b
side of the vibrating body 12a resonates in the first space 21a and is directly radiated to the
outside of the electronic device through the first opening 22. The sound of the opposite phase
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generated on the second main surface 12 c side of the vibrating body 12 a is radiated to the
internal space of the electronic device through the second opening constituted by the plurality of
through holes 23. Thus, high-quality sound can be easily generated from the composite
electronic device including the speaker cartridge and the electronic device.
[0029]
When only the vibrating body 12a is directly disposed inside the electronic device, the sound
generated on the side of the first main surface 12b of the vibrating body 12a and the opposite
phase generated on the side of the second main surface 12c of the vibrating body 12a The
problem arises that the sound mixes and cancels in the internal space of the electronic device.
Further, since the sound generated from the vibrating body 12a resonates in the internal space
of the electronic device, the internal space of the electronic device becomes a resonant space. For
this reason, the sound quality changes due to the influence of the shape and material of the
casing of the electronic device, and the arrangement, shape, and material of various components
arranged inside the casing of the electronic device, which makes the acoustic design very
difficult. .
[0030]
On the other hand, since the speaker cartridge of the present embodiment includes the first case
10 which forms the resonance space by surrounding the vibrating body 12a, the shape and the
material of the case of the electronic device and the case of the electronic device The acoustic
design can be performed only by the shape and material of the vibrating body 12a and the first
housing 10 without being substantially affected by the arrangement, shape, material, and the like
of various parts disposed inside the body. The first case 10 may have a lower strength than the
case of the electronic device, and is less limited by factors other than the acoustic design. For this
reason, the size, shape, material, and the like of the first housing 10 can be freely set in
consideration of only the acoustic design. And the 1st opening 22 which connects the space
outside the electronic device and the 1st space 21a is formed in the 1st case 10, and the sound of
the high sound quality which occurred on the 1st principal surface 12b side of vibrator 12a Can
be radiated directly from the first opening 22 to the space outside the electronic device. The
position, shape and size of the first opening 22 can also be determined by acoustic design.
[0031]
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In addition, the sound generated on the second main surface 12c side of the vibrating body 12a
is radiated to the inside of the electronic device through the second opening formed by the
plurality of through holes 23, whereby the first main surface 12b side is generated. It is possible
to prevent the sound generated in the above and the sound generated on the second main
surface 12c side from being mixed and canceled in the external space. If the second opening does
not exist, it is necessary to increase the volume of the second space in order to prevent air in the
second space from acting as a spring to inhibit the vibration of the vibrating body 12a. The
problem arises that the speaker cartridge is upsized. In addition, when the second opening is
exposed to the external space, the sound generated on the first main surface 12b side and the
sound generated on the second main surface 12c side are prevented from being mixed and
canceled in the external space. Therefore, it is necessary to increase the volume of the second
space, which causes a problem that the speaker cartridge is enlarged. The sound generated on
the second main surface 12c side is radiated to the inside of the electronic device through the
second opening, whereby the sound generated on the first main surface 12b side and the second
main surface 12c side While being able to prevent that the produced | generated sound mixes
and cancels out in external space, it can prevent that a speaker cartridge enlarges. Note that the
external space is a space outside the electronic device and the speaker cartridge, and means a
space in which an object to hear a sound exists.
[0032]
As described above, the composite electronic device that generates high-quality sound can be
easily realized simply by inserting the speaker cartridge into the slot of the electronic device and
electrically connecting the speaker cartridge. In addition, by preparing a plurality of speaker
cartridges having different sound designs and generating different sound qualities of the sound
and replacing them, the sound quality of the sound generated from the composite electronic
device can be easily changed. A device in which the speaker cartridge and the electronic device
are detachably connected is referred to as a composite electronic device. The details of the
composite electronic device will be described in fourth to eighth embodiments.
[0033]
The speaker cartridge of the present embodiment includes a vibrating body 12 a, an exciter 11, a
first housing 10, and a first connector 20. The exciter 11 is attached to the vibrator 12a. The first
housing 10 encloses the vibrator 12 a and is accommodated therein. The first connector 20 is
electrically connected to the exciter 11. The vibrating body 12a has a first major surface 12b and
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a second major surface 12c, which are surfaces opposite to each other. Further, the speaker
cartridge of the present embodiment has a first space 21 a, a second space 21 b, a first opening
22 and a second opening. The first space 21 a is a space surrounded by the first main surface 12
b of the vibrating body 12 a and the first housing 10. The second space 21 b is a space
surrounded by the second main surface 12 c of the vibrating body 12 a and the first housing 10.
The first opening 22 is provided in a portion in contact with the first space 21 a in the first
housing 10. The second opening is provided in a portion in contact with the second space 21 b in
the first housing 10. Therefore, the first space 21 a and the external space are connected via the
first opening 22, and the second space 21 b and the internal space of the electronic device are
connected via the second opening. By connecting the speaker cartridge to the electronic device, a
composite electronic device capable of generating high-quality sound can be easily realized.
[0034]
The speaker cartridge of the present embodiment can be manufactured, for example, as follows.
First, a binder, a dispersant, a plasticizer and a solvent are added to the powder of the
piezoelectric material, and the mixture is stirred to prepare a slurry. As a piezoelectric material,
any of lead-based and non-lead-based can be used. Next, the obtained slurry is formed into a
sheet to prepare a green sheet. A conductor paste is printed on the green sheet to form a
conductor pattern to be an internal electrode, and the green sheet on which the conductor
pattern is formed is laminated to produce a laminate molded body.
[0035]
Next, the laminate is degreased and fired, and cut into a predetermined size to obtain a laminate.
As needed, the outer peripheral part of a laminated body is processed. Next, a conductor paste is
printed on the main surface in the lamination direction of the laminate to form a conductor
pattern to be a surface electrode layer, and the conductor paste is printed on both sides in the
longitudinal direction (x-axis direction) of the laminate. A conductor pattern to be a pair of
terminal electrodes is formed. And the structure used as the exciter 11 can be obtained by baking
an electrode at predetermined | prescribed temperature. Thereafter, in order to impart
piezoelectricity to the exciter 11, a DC voltage is applied through the surface electrode layer or
the pair of terminal electrodes to polarize the piezoelectric layer of the exciter 11. Thus, the
exciter 11 can be obtained.
[0036]
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12
Next, the peripheral edge of the film 12 in a tensioned state is sandwiched and fixed between the
frame 14a and the frame 14b coated with the adhesive, and the adhesive is cured and joined.
Then, the exciter 11 is bonded to the film 12 with an adhesive on the second major surface 12 c
of the vibrating body 12 a, and a wire is connected to the exciter 11. Then, the resin is poured
into the inside of the frame 14 a and cured to form the resin layer 13.
[0037]
Then, the spacer 15, the spacer 16, the panel 17, and the panel 18 prepared in advance are
joined with an adhesive or an adhesive to form the first housing 10, and the first connector 20 is
bonded to the first housing 10 with an adhesive or the like. The first connector 20 and the
exciter 11 are connected by wiring (not shown). Thus, the speaker cartridge of the present
embodiment can be obtained.
[0038]
Second Embodiment FIG. 8 is a perspective view schematically showing a speaker cartridge
according to a second embodiment of the present invention. FIG. 9 is a plan view seen from the +
z direction schematically showing the speaker cartridge of the second embodiment of the present
invention, and shows a state in which the panel 17 is removed. In addition, in this embodiment,
points different from the above-described speaker cartridge of the first embodiment will be
described, and the same components will be denoted by the same reference symbols, and
overlapping descriptions will be omitted.
[0039]
As shown in FIGS. 8 and 9, the sound generating apparatus according to the present embodiment
supports a center 19 of the end of the panel 17 in the + x direction on the + z direction surface of
the frame 14b in contact with the first opening 22. Is arranged. The first opening 22 is divided
by the support 19 into an opening 22 a and an opening 22 b. That is, the first opening 22 is
configured by the opening 22a and the opening 22b. The other configuration is the same as that
of the speaker cartridge according to the first embodiment described above.
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[0040]
The speaker cartridge of this embodiment having such a configuration can also achieve the same
effects as the speaker cartridge of the first embodiment described above. Further, since the
speaker cartridge of the present embodiment has the support 19, even when the strength of the
panel 17 is small, the shapes of the opening 22a and the opening 22b can be maintained in a
desired shape.
[0041]
Third Embodiment FIG. 10 is a perspective view schematically showing a speaker cartridge
according to a third embodiment of the present invention. FIG. 11 is a perspective view
schematically showing a speaker cartridge according to a third embodiment of the present
invention, in which the reflector 24 is removed. FIG. 12 is a plan view seen from the + z direction
schematically showing the speaker cartridge of the third embodiment of the present invention. In
addition, in this embodiment, points different from the above-described speaker cartridge of the
first embodiment will be described, and the same components will be denoted by the same
reference symbols, and overlapping descriptions will be omitted.
[0042]
In the speaker cartridge according to the present embodiment, as shown in FIGS. 10 to 12, the
reflector 24 is joined to the end of the first housing 10 in which the first opening 22 is formed in
the + x direction, and the reflector 24 1 opening 22 is blocked. And instead, a notch is formed at
the end of the panel 17 in the + x direction, and a first opening 22 c is formed between the panel
17 and the reflector 24. And external space and the 1st space 21a are connected by the 1st
opening 22c.
[0043]
When the speaker cartridge of the present embodiment is used, the first opening 22c may be
protruded from the + x direction end of the electronic device by reducing the insertion depth of
the speaker cartridge into the electronic device. Alternatively, the first opening 22c may be
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exposed to the outside of the electronic device by cutting out a portion covering the first opening
22c of the housing of the electronic device.
[0044]
The speaker cartridge of this embodiment having such a configuration can also achieve the same
effects as the speaker cartridge of the first embodiment described above. In addition, since the
speaker cartridge of the present embodiment has the reflector 24 and the first opening 22c, the
sound pressure on the + z direction side of the sound generated from the speaker cartridge is
greater than that of the speaker cartridge of the first embodiment. It can be enhanced.
[0045]
Fourth Embodiment FIG. 13 is a plan view seen from the + z direction side, schematically
showing a composite electronic device according to a fourth embodiment of the present
invention. FIG. 14 is a plan view seen from the + x direction side, schematically showing a
composite electronic device according to a fourth embodiment of the present invention. FIG. 15
is a cross-sectional view schematically showing a part of a composite electronic device according
to a fourth embodiment of the present invention. In addition, in this embodiment, points different
from the above-described second embodiment will be described, and the same components will
be assigned the same reference numerals and overlapping descriptions will be omitted.
[0046]
The composite electronic device according to the present embodiment includes a speaker
cartridge 26a and an electronic device 38a, as shown in FIGS. The speaker cartridge 26a is the
speaker cartridge of the second embodiment described above. The electronic device 38 a
includes a second housing 25, a second connector 30, and an electronic circuit 60.
[0047]
The second housing 25 has a rectangular box-like outer shape, and a third space 31 surrounded
by the second housing 25 is formed. In the third space 31, various components including the
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electronic circuit 60 are accommodated. Such a second housing 25 can be formed using various
materials such as resin, metal, ceramics, glass, and wood. Further, the shape of the second
housing 25 is not limited to a rectangular shape, and may be, for example, other various shapes
such as a regular tetrahedron, a truncated cone, and a sphere.
[0048]
A slot 28 is formed at the end of the second housing 25 in the + x direction. The slot 28 a is a
rectangular solid deep recess, and a second connector 30 and a joint 35 are provided in a portion
of the second housing 25 located inside the slot 28 a. The second connector 30 is connected to
the electronic circuit 60 by a wire (not shown). The bonding portion 35 is configured using a
material having high elasticity, and a recess in which the end portion on the −x direction side of
the bonding portion 34 is inserted is provided at the end portion on the + x direction side.
[0049]
The speaker cartridge 26a is inserted into the slot 28 from the + x direction side. The joint 34 of
the speaker cartridge 26a is inserted into and fitted to the joint 35 of the electronic device 38a,
whereby the speaker cartridge 26a is detachably joined to the electronic device 38a. Further, the
first connector 20 of the speaker cartridge 26a is connected to the second connector 30 of the
electronic device 38a, whereby the electronic circuit 60 of the electronic device 38a and the
exciter 11 of the speaker cartridge 26a are electrically connected. It is connected. The end of the
speaker cartridge 26a on the + x direction side is exposed to the external space of the electronic
device 38a from the opening of the slot 28a, and the first opening 22 provided on the end of the
speaker cartridge 26a on the + x direction The openings 22a and 22b) are also exposed to the
external space. Note that the external space is a space outside the electronic device 38a and the
speaker cartridge 26a, and means a space in which an object to hear a sound exists.
[0050]
In addition, a third opening 32 is provided in the second housing 25. The third opening 32 is a
portion in the second housing 25 in contact with the third space 31 and is provided in a portion
facing the second opening (a plurality of through holes 23) of the speaker cartridge 26a. That is,
the second opening of the speaker cartridge 26a and the third opening 32 of the electronic
device 38a are disposed to face each other. The second space 21 b and the third space 31 are
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connected to each other through the second opening (a plurality of through holes 23) and the
third opening 32. Therefore, the sound generated on the second main surface 12 c side of the
vibrating body 12 a is radiated to the third space 31 which is the internal space of the electronic
device 38 through the second opening and the third opening 32.
[0051]
In addition, a sound insulation member 33 is provided on the outer surface of the second
housing 25 so as to continuously surround the third opening 32. The sound insulating member
33 is made of a material having a smaller elastic modulus than the material forming the first
housing 10 and the second housing 25 and is easily deformed by an external force. In addition,
when the speaker cartridge 26a is inserted into the slot 28a, the thickness of the sound
insulating member 33 is larger than the distance generated between the first housing 10 and the
second housing 25. Therefore, when the speaker cartridge 26a is inserted into the slot 28a, the
sound insulating member 33 is deformed, and a gap between the first housing 10 and the second
housing 25 is formed around the second opening and the third opening 32. The sound insulation
member 33 is closed. Therefore, it is possible to prevent the sound generated on the second main
surface 12c side of the vibrating body 12a from leaking to the external space.
[0052]
Such a sound insulation member 33 can be configured using, for example, various known elastic
and easily deformable materials such as rubber materials such as urethane rubber and soft resin
materials such as silicone resin. In particular, porous rubber materials such as urethane foam can
be suitably used. Also, the sound insulation member 33 can be bonded to the second housing 25
using various known bonding members such as, for example, an adhesive.
[0053]
Then, when an electric signal is supplied from the electronic circuit 60 to the exciter 11, the
vibration of the exciter 11 vibrates the vibrating body 12a to generate sound. Then, the sound
generated on the first main surface 12b side of the vibrating body 12a is radiated to the outside
of the electronic device 38a from the first opening (the opening 22a and the opening 22b) of the
speaker cartridge 26a. Further, the sound generated on the second main surface 12 c side of the
vibrating body 12 a is radiated to the third space 31 via the second opening and the third
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opening 32.
[0054]
Thus, the composite electronic device of the present embodiment includes the electronic device
38 a and the speaker cartridge 26 a. The speaker cartridge 26a is detachably connected to the
electronic device 38a. The speaker cartridge 26 a includes a vibrating body 12 a, an exciter 11, a
first housing 10, and a first connector 20. The exciter 11 is attached to the vibrator 12a. The first
housing 10 encloses the vibrator 12 a and is accommodated therein. The first connector 20 is
electrically connected to the exciter 11. The vibrating body 12a has a first major surface 12b and
a second major surface 12c, which are surfaces opposite to each other. Further, the composite
electronic device of the present embodiment includes the first space 21 a and the second space
21 b. The first space 21 a is a space surrounded by the first main surface 12 b of the vibrating
body 12 a and the first housing 10. The second space 21 b is a space surrounded by the second
main surface 12 c of the vibrating body 12 a and the first housing 10. The electronic device 38 a
includes an electronic circuit 60, a second connector 30, and a second housing 25. The second
connector 30 is connected to the electronic circuit 60. In addition, the electronic device 38 a has
a third space 31 surrounded by the second housing 25. And the 1st connector 20 and the 2nd
connector 30 are connected, and the exciter 11 and the electronic circuit 60 are electrically
connected. Further, a first opening 22 is provided in a portion of the first housing 10 in contact
with the first space 21 a, and the first space 21 a and the external space are connected via the
first opening 22. A second opening is provided in a portion of the first housing 10 in contact with
the second space 21b, and the second space 21b and the third space 31 are connected via the
second opening. In the composite electronic device of this embodiment having such a
configuration, the sound generated on the first main surface 12b side of the vibrating body 12a
and the sound generated on the second main surface 12c side are mixed in the external space
and cancel each other out. Can be reduced, so that high sound pressure sound can be generated.
Further, in the composite electronic device of the present embodiment, the material and the
internal structure of the second housing 25 hardly affect the sound radiated from the first
opening 22 to the external space, so it is easy to make high-quality sound. Can be generated.
Further, the composite electronic device of the present embodiment can be made smaller because
the second space 21 b can be made smaller while suppressing the deterioration of the sound
quality. Also, the composite electronic device of the present embodiment can easily change the
sound quality of the generated sound by replacing the speaker cartridge 26a with a speaker
cartridge having different acoustic characteristics.
[0055]
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18
Further, in the composite electronic device of the present embodiment, a sound insulating
member 33 for blocking the second space 21 b and the third space 31 from the external space is
provided between the first housing 10 and the second housing 25. The sound insulation member
33 is formed using a material having a smaller elastic modulus than the material forming the first
housing 10 and the material forming the second housing 25. Thereby, since the leak to the
exterior space of the sound which generate | occur | produced on the 2nd main surface 12c side
of the vibrating body 12a can be reduced, the fall of the sound pressure in the sound radiated to
exterior space can be reduced.
[0056]
Further, a speaker cartridge is provided by providing a joint portion for detachably joining the
first housing 10 to the second housing 25 in at least one of the first housing 10 and the second
housing 25. 26a can be easily and detachably connected to electronic device 38a. The composite
electronic device of the present embodiment has a bonding portion 34 and a bonding portion 35
for detachably bonding the first housing 10 to the second housing 25, and the bonding portion
34 is the first housing 10. The joint portion 35 is provided in the second housing 25. However,
the bonding portion for detachably bonding the first housing 10 to the second housing 25 may
be provided in at least one of the first housing 10 and the second housing 25 depending on the
shape thereof.
[0057]
Further, in the composite electronic device of the present embodiment, the slot 28a is provided
in the second housing 25, and the speaker cartridge 26a is inserted in the slot 28a. Thereby, the
appearance of the composite electronic device can be improved.
[0058]
Further, in the composite electronic device of the present embodiment, the second opening and
the first connector 20 are located inside the slot 28, and the first opening 22 is external in a state
where the speaker cartridge 26 is inserted into the slot 28. Exposed to space. As a result, the
sound guiding portion connecting the first opening 22 and the external space becomes
unnecessary, and mechanical and electrical connection between the speaker cartridge 26 a and
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the electronic device 38 a becomes easy, and the speaker cartridge 26 a and the electronic
device 38 a The connection reliability with the device 38a can also be improved. However, the
first opening 22 may be covered with, for example, a mesh-like material having a very small
influence on sound, such as a wire mesh.
[0059]
Further, in the present embodiment, assuming that mutually opposite directions are a first
direction and a second direction, the first connector 20 is provided at an end portion in the first
direction (−x direction) in the first housing 10. The first opening 22 is provided at an end of the
first housing 10 in the second direction (+ x direction). Thereby, the speaker cartridge 26a can
easily expose the first opening 22 to the external space when the -x direction side end is
connected to the electronic device 38a.
[0060]
Further, in the present embodiment, the joint portion 34 is provided in the first housing 10 of the
speaker cartridge 26 a. Thus, the speaker cartridge 26 a is easy to attach to and detach from the
first housing 10.
[0061]
Further, in the present embodiment, the electronic device 38 includes the electronic circuit 60,
the second connector 30 connected to the electronic circuit 60, and the second housing 25. The
electronic device 38 also has a third space 31 and a third opening 32. The third space 31 is a
space surrounded by the second housing 25. The third opening 32 is provided in a portion in
contact with the third space 31 in the second housing 25. Thereby, the speaker cartridge 26a is
attached such that the first connector 20 is connected to the second connector 30 and the
second opening is connected to the third opening 32, thereby facilitating sound with good sound
quality and high sound pressure. It can radiate to the outside space.
[0062]
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20
Further, in the present embodiment, the electronic device 38 a is provided with the sound
insulating member 33 surrounding the third opening in the second housing 25, and the sound
insulating member 33 has a modulus of elasticity higher than that of the material constituting
the second housing 25. Is constructed using a small material. Thereby, when the speaker
cartridge 26a is attached to the electronic device 38a, it is possible to prevent the sound
generated on the second main surface 12c side of the vibrating body 12a from leaking to the
external space.
[0063]
Further, in the present embodiment, in the electronic device 38 a, the bonding portion 35 is
provided in the second housing 25. Thus, it is easy to detachably connect the speaker cartridge
26a to the electronic device 38a.
[0064]
The composite electronic device of this embodiment may have other various configurations and
functions. For example, it may have an antenna or a communication circuit and have a
communication function. In addition, it may have an image processing circuit or a display device,
and may have a function of displaying a moving image or a still image. Further, it may have an
arithmetic circuit, an input device, an output device, and the like, and have a function of
executing the instructed processing and displaying the result. That is, the composite electronic
device of the present embodiment may be a television, a radio, an audio device, a personal
computer, a tablet terminal or the like. Furthermore, the composite electronic device of the
present embodiment may be various electronic devices such as a vacuum cleaner, a washing
machine, a refrigerator, and a microwave oven, having a function of generating sound and voice.
[0065]
Fifth Embodiment FIG. 16 is a plan view seen from the + z direction side, schematically showing a
composite electronic device according to a fifth embodiment of the present invention. In the
present embodiment, only the differences from the composite electronic device of the fourth
embodiment described above will be described, and the same reference numerals will be given to
similar components to omit redundant descriptions.
16-04-2019
21
[0066]
The composite electronic device of the present embodiment includes an electronic device 38 b, a
speaker cartridge 26 a, and a speaker cartridge 26 b. The electronic device 38 b has the same
structure as the electronic device 38 a in the fourth embodiment described above except that the
electronic device 38 b further includes a slot 28 b. The speaker cartridge 26b is the same as the
speaker cartridge 26a, and is rotated 180 degrees around the z-axis. The slot 28b has the same
structure as the slot 28a, and is rotated 180 degrees around the z-axis. The speaker cartridge
26b is inserted into the slot 28b.
[0067]
The slot 28 b is formed at the end of the second housing 25 in the −x direction, and the speaker
cartridge 26 b is inserted from the −x direction side. The first connector 20 of the speaker
cartridge 26b is connected to a second connector 30 provided inside the slot 28b. The end of the
speaker cartridge 26b on the -x direction side is exposed to the outside of the electronic device
38b from the opening of the slot 28b, and the first opening provided on the end of the speaker
cartridge 26b on the -x direction side ( The openings 22a and 22b) are also exposed to the
outside of the electronic device 38b.
[0068]
The second connector 30 provided inside the slot 28 b is also connected to the electronic circuit
60 by a wire (not shown). Then, the electric signal from the electronic circuit 60 is also supplied
to the exciter 11 of the speaker cartridge 26b, and the sound generated on the second main
surface 12c side of the vibrating body 12a is the first opening (opening 22a and the opening of
the speaker cartridge 26b). It radiates from the opening 22b) to the external space.
[0069]
The composite electronic device of this embodiment having such a configuration includes the
speaker cartridge 26a disposed at the end of the electronic device 38b in the + x direction, and
the speaker cartridge 26b disposed at the end of the electronic device 38b in the −x direction.
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Sound can be generated from both. As a result, stereo reproduction can be performed, and a
large amount of realistic sound can be generated.
[0070]
Sixth Embodiment FIG. 17 is a plan view seen from the + z direction side, schematically showing
a composite electronic device according to a sixth embodiment of the present invention. In the
present embodiment, only the differences from the composite electronic device of the fourth
embodiment described above will be described, and the same reference numerals will be given to
similar components to omit redundant descriptions.
[0071]
The composite electronic device of the present embodiment includes an electronic device 38c
and a speaker cartridge 26c, as shown in FIG. The speaker cartridge 26c is the speaker cartridge
of the third embodiment described above. The electronic device 38c has the same structure as
the electronic device 38a in the fourth embodiment described above except that the notch
portion 27a is formed on the + z direction side of the + x direction end of the second housing 25.
doing.
[0072]
In the composite electronic device of the present embodiment, as shown in FIG. 17, the speaker
cartridge 26c is inserted into the slot 28a of the electronic device 38c. The first opening 22c of
the speaker cartridge 26c is exposed to the outside of the electronic device 38c through the
notch 27a.
[0073]
The speaker cartridge 26c is inserted into the slot 28a from the + x direction side. The first
connector 20 of the speaker cartridge 26c is connected to a second connector 30 provided inside
the slot 28a. Then, an electrical signal from the electronic circuit 60 is supplied to the exciter 11
of the speaker cartridge 26c, and the sound generated on the first main surface 12b side of the
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vibrating body 12a is radiated from the first opening 22c of the speaker cartridge 26c to the
external space Be done.
[0074]
In the composite electronic device of this embodiment having such a configuration, since the first
opening 22c of the speaker cartridge 26c is exposed on the surface on the + z direction side of
the electronic device 38c, the acoustic + z generated from the composite electronic device is The
sound pressure on the direction side can be increased.
[0075]
In the speaker cartridge of the present embodiment, the first opening 22c of the speaker
cartridge 26c is exposed to the external space through the notch 27a, but the present invention
is not limited to this.
For example, the insertion depth of the speaker cartridge 26c into the slot 28a may be reduced
so that the first opening 22c protrudes from the end of the electronic device 38c in the + x
direction.
[0076]
Seventh Embodiment FIG. 18 is a plan view seen from the + z direction side, schematically
showing a composite electronic device according to a seventh embodiment of the present
invention. In the present embodiment, only differences from the composite electronic device
according to the sixth embodiment described above will be described, and the same components
as those in the sixth embodiment will be denoted by the same reference numerals and redundant
descriptions will be omitted.
[0077]
The composite electronic device of the present embodiment, as shown in FIG. 18, includes an
electronic device 38 d, a speaker cartridge 26 c, and a speaker cartridge 26 d. The electronic
device 38d has the same structure as the electronic device 38c in the sixth embodiment
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described above, except that the electronic device 38d further includes a slot 28b and a notch
27b. The speaker cartridge 26d is the same as the speaker cartridge 26c, and is rotated 180 °
around the z axis. The slot 28b has the same structure as the slot 28a, and is rotated 180 degrees
around the z-axis. The speaker cartridge 26d is inserted into the slot 28b. The notch 27b is
formed on the + z direction side of the end of the second housing 25 in the -x direction, and the
first opening 22c of the speaker cartridge 26d is exposed to the external space through the notch
27b. ing.
[0078]
The speaker cartridge 26d is inserted into the slot 28b from the -x direction side. The first
connector 20 of the speaker cartridge 26d is connected to a second connector 30 provided
inside the slot 28b. Then, the electric signal from the electronic circuit 60 is also supplied to the
exciter 11 of the speaker cartridge 26d, and the sound generated on the side of the first main
surface 12b of the vibrating body 12a passes from the first opening 22c of the speaker cartridge
26d to the external space. It is emitted.
[0079]
The composite electronic device of this embodiment having such a configuration generates
sound from both the speaker cartridge 26c disposed at the end in the + x direction and the
speaker cartridge 26d disposed at the end in the −x direction. It can be done. As a result, stereo
reproduction can be performed, and a large amount of realistic sound can be generated.
[0080]
Eighth Embodiment FIG. 19 is a plan view seen from the + z direction side, schematically showing
a composite electronic device according to an eighth embodiment of the present invention. FIG.
20 is a cross-sectional view schematically showing a part of a composite electronic device
according to an eighth embodiment of the present invention. In the present embodiment, only
the differences from the composite electronic device of the fourth embodiment described above
will be described, and the same reference numerals will be given to similar components to omit
redundant descriptions. The composite electronic device according to the present embodiment
includes an electronic device 38e and a speaker cartridge 26e, as shown in FIGS.
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25
[0081]
The electronic device 38e has almost the same structure as the electronic device 38a. The
difference between the electronic device 38e and the electronic device 38a is that the electronic
device 38e has a recess 29 instead of the slot 28a, the positions of the second connector 30 and
the joint portion 35, and the point that the sound insulation member 33 is not provided. Only.
The recess 29 is provided on the + z direction side of the end of the second housing 25 of the
electronic device 38 e in the x-axis direction. The second connector 30 and the joint portion 35
are disposed on the surface on the + z direction side of the portion of the second housing 25
where the recess 29 is formed.
[0082]
The speaker cartridge 26e has almost the same structure as the speaker cartridge 26a. The
speaker cartridge 26e differs from the speaker cartridge 26a only in that it has the sound
insulation member 37 and the positions of the first connector 20 and the joint portion 34. The
joint portion 34 and the first connector 20 are disposed on the surface of the first housing 10 on
the −z direction side. Further, the sound insulation member 37 is provided on the surface on the
−z direction side of the first housing 10 so as to surround the second opening formed of the
plurality of through holes 23. The sound insulation member 37 has the same shape and material
as the sound insulation member 33 described above, and exerts the same effect as the sound
insulation member 33.
[0083]
Then, the speaker cartridge 26e is fitted into the recess 38 of the electronic device 38e from the
+ x direction side. The joint 34 of the speaker cartridge 26e is joined to the joint 35 provided in
the recess 29, and the first connector 20 of the speaker cartridge 26e is connected to the second
connector 30 provided in the recess 29. There is. Then, an electrical signal from the electronic
circuit 60 is supplied to the exciter 11 of the speaker cartridge 26e, and the sound generated on
the side of the first main surface 12b of the vibrating body 12a is the first opening (openings 22a
and 22b) of the speaker cartridge 26e. It radiates from the opening 22b) to the external space.
Thus, the composite electronic device of the present embodiment also functions in the same
manner as the composite electronic device of the fourth embodiment described above.
16-04-2019
26
[0084]
In the composite electronic device according to the present embodiment, the recess 29 is
provided in the second housing 25 of the electronic device 38e, and at least a part of the first
housing 10 of the speaker cartridge 26e is fitted in the recess 29. As a result, it can be confirmed
from the appearance that the speaker cartridge 26e is mounted, and the speaker cartridge 26e
can be prevented from largely protruding outward.
[0085]
Further, in the present embodiment, the sound insulating member 37 surrounding the second
opening of the speaker cartridge 26 e is provided in the first housing 10, and the sound
insulating member 37 has a modulus of elasticity higher than that of the material constituting
the first housing 10. It is constructed using small materials. Accordingly, when the speaker
cartridge 26e is attached to the electronic device 38e, it is possible to prevent the sound
generated on the second main surface 12c side of the vibrating body 12a from leaking to the
external space.
[0086]
(Modification) The present invention is not limited to the above-described embodiment, and
various changes and improvements can be made without departing from the scope of the present
invention.
[0087]
For example, although the example which used the piezoelectric element as the exciter 11 was
shown in embodiment mentioned above, it is not limited to this.
The exciter 11 only needs to have a function of converting an electrical signal into mechanical
vibration, and another one having a function of converting an electrical signal into mechanical
vibration may be used as the exciter 11. For example, an electrodynamic exciter, an electrostatic
exciter, or an electromagnetic exciter well known as an exciter for vibrating a speaker may be
used as the exciter 11. It is to be noted that the electrodynamic exciter is such that a current is
16-04-2019
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supplied to the coil disposed between the magnetic poles of the permanent magnet to vibrate the
coil, and the electrostatic exciter is formed of two facing metals The bias and the electrical signal
are supplied to the plate to cause the metal plate to vibrate, and the electromagnetic exciter is to
cause the electrical signal to flow to the coil to cause the thin iron plate to vibrate.
[0088]
Moreover, in the embodiment mentioned above, although the example in which one exciter 11
was attached to the surface of the film 12 was shown, it is not limited to this. For example, two or
more exciters may be attached to the surface of the film 12.
[0089]
Next, specific examples of the present invention will be described. The composite electronic
device of the fifth embodiment shown in FIG. 16 was produced, and its characteristics were
evaluated.
[0090]
First, a slurry was prepared by kneading a piezoelectric powder containing lead zirconate titanate
(PZT) in which a part of Zr was replaced with Sb, a binder, a dispersant, a plasticizer, and a
solvent by ball mill mixing. . And the green sheet was produced by the doctor blade method using
the obtained slurry. A conductor paste containing Ag and Pd was applied to the green sheet in a
predetermined shape by screen printing to form a conductor pattern to be an internal electrode
layer. And the green sheet and other green sheets in which the conductor pattern was formed
were laminated | stacked and pressurized, and the lamination | stacking molded object was
produced. Then, the laminate was degreased in the air at 500 ° C. for 1 hour, and then fired in
the air at 1100 ° C. for 3 hours to obtain a laminate.
[0091]
Next, both end surface portions in the longitudinal direction of the obtained laminate were cut by
dicing to expose the tip of the internal electrode layer on the side surface of the laminate. And
16-04-2019
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the conductive paste containing Ag and glass was apply | coated to the both-sides principal
surface of a laminated body by the screen-printing method, and the surface electrode layer was
formed. Thereafter, a conductor paste containing Ag and glass was applied by dip method to both
side surfaces in the longitudinal direction of the laminate, and baked at 700 ° C. for 10 minutes
in the air to form terminal electrodes. Thereby, a laminate was produced. The shape of the
produced laminate was 14 mm in width, 36 mm in length, and 0.1 mm in thickness. Then,
polarization was performed by applying a voltage of 100 V for 2 minutes through the terminal
electrode, and an exciter 11 which is a bimorph-type laminated piezoelectric element was
obtained.
[0092]
Next, a film 12 made of PET with a thickness of 25 μm was prepared and fixed to the frames
14a and 14b in a tensioned state. The frame 14a had a thickness of 0.3 mm, and the frame 14b
had a thickness of 0.5 mm and made of stainless steel. The dimensions of the film 12 on the
inner side of the frame 14a and the frame 14b were 60 mm in length and 30 mm in width. Then,
the exciter 11 was bonded to one fixed main surface of the film 12 with an adhesive, and a wire
was connected to the exciter 11. Then, the inside of the frame 14 a is filled with an acrylic resin
so as to have the same height as the frame 14 a and solidified to form the resin layer 13.
[0093]
Next, the first housing 10 was formed using the spacer 15, the spacer 16, the panel 17 and the
panel 18 prepared in advance. The spacer 15 and the spacer 16 were formed using stainless
steel with a thickness of 1 mm. The panels 17 and 18 were formed using a 1 mm thick acrylic
plate. The plurality of through holes 23 formed in the panel 18 are circular with a diameter of 1
mm. The external shape of the first housing 10 was a rectangular solid having a length of 65 mm
and a width of 35 mm. A double-sided tape was used to join the frame 14a, the frame 14b, the
spacer 15, the spacer 16, the panel 17 and the panel 18. Thus, the speaker cartridge 26a and the
speaker cartridge 26b were manufactured.
[0094]
Next, the second housing 25 of the electronic device 38b shown in FIG. 16 is formed using an
acrylic plate, the speaker cartridge 26a is inserted into the slot 28a formed in the second housing
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29
25, and the speaker cartridge 26b is inserted into the slot 28b. Inserted. The shape of the second
housing 25 was a rectangular solid having a length of 260 mm, a width of 180 mm, and a
thickness of 10 mm. A double-sided tape was used to bond the acrylic plates together.
[0095]
Then, a sine wave of 7 V effective value is given to the exciter 11 of the speaker cartridge 26a
and the speaker cartridge 26b, and the frequency of sound pressure at a position 25 cm away in
the + z direction from the center of the + z direction side surface of the second housing 25 The
characteristics were measured. The results are shown in FIG.
[0096]
In the graph shown in FIG. 21, the horizontal axis indicates frequency, and the vertical axis
indicates sound pressure level. According to the graph shown in FIG. 21, it can be seen that the
sound pressure level is high at a wide frequency, the frequency characteristic of the sound
pressure level is flat, and the sound quality is good with small distortion. This confirms the
effectiveness of the present invention.
[0097]
10: first housing 11: exciter 12a: vibrating body 20: first connector 21a: first space 21b: second
space 22, 22a, 22b, 22c: first opening 23: through hole 25: second housing 26a, 26b, 26c, 26e,
26e: speaker cartridge 28a, 28b: slot 29: recess 30: second connector 31: third space 33, 37:
sound insulation member 34: joint 35: joint 38a, 38b, 38c, 38d, 38e: electronic device 60:
electronic circuit
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