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DESCRIPTION JP2006157227

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DESCRIPTION JP2006157227
PROBLEM TO BE SOLVED: To provide a flat panel speaker having an impact resistant structure,
which more appropriately carries out the impact mitigation on a piezoelectric ceramic
diaphragm. SOLUTION: A piezoelectric ceramic diaphragm 11 composed of a plate-shaped
piezoelectric ceramic element 14 and an electrode foil disposed on one surface thereof and an
electrode thin plate 13 disposed on the other surface is accommodated in a module case 20. In
the modularized flat panel speaker, the piezoelectric ceramic diaphragm 11 joined to the surface
on the opposite side to the surface on which the base 23 of the cantilever holder 21 is provided,
and the shock absorbing member 34 is piezoelectric A space is formed on the inner surface of
the module case 20 opposed to one surface of the ceramic diaphragm 11, and the surface of the
cantilever holder 21 opposite to the surface to which the piezoelectric ceramic diaphragm 11 is
bonded is formed. A flat panel speaker formed with a gap on the inner surface of the opposing
module case 20. [Selected figure] Figure 2
フラットパネルスピーカ
[0001]
The present invention relates to a flat panel speaker, and more particularly to a piezoelectric
ceramic diaphragm comprising a plate-like piezoelectric ceramic element, an electrode foil
disposed on one side thereof, and an electrode thin plate disposed on the other side, and both
sides thereof The present invention relates to a flat panel speaker in which the above-described
impact absorbing member is accommodated in a module case, and the piezoelectric actuator is
modularized and joined and fixed to a flat panel.
[0002]
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1
The conventional example will be described with reference to FIGS.
8 is a prior art example of the piezoelectric actuator, FIG. 9 is an exploded perspective view of
the piezoelectric ceramic diaphragm, and FIG. 10 is a view showing the piezoelectric actuator
attached to the flat panel of the main body case covering the display surface of the device. FIG.
11 is a continuation of FIG. In portable electronic devices such as portable telephones, personal
digital assistants (PDAs), and small computers (PCs), the flat flat panel vibrates on a transparent
flat panel that covers the display surface of the liquid crystal display element to form the surface
of the device. It is used as a plate and employs a configuration in which a flat panel is driven to
emit sound waves into space. A piezoelectric actuator 10 is used as a piezoelectric actuator 10
for driving the flat panel, which is attached to the back surface of the flat panel.
[0003]
The piezoelectric actuator 10 has two piezoelectric ceramic diaphragms 11 and 12 having
different lengths, and the piezoelectric ceramic diaphragms 11 and 12 are held parallel to each
other by a holder 21 (see Patent Document 1). In the piezoelectric ceramic diaphragms 11 and
12, a pair of plate-shaped piezoelectric ceramic elements 14 is disposed with the thin electrode
plate 13 positioned at the center, and electrode foils 15 are disposed outside the plate-shaped
piezoelectric ceramic elements 14, respectively. It consists of. The electrode thin plate 13 located
at the center is formed of a stainless steel plate, and a plate-like piezoelectric ceramic element 14
made of ceramic exhibiting a piezoelectric phenomenon such as PZT (lead titanium zirconate) is
stuck and attached to the electrode thin plate 13. The outer electrode foil 15 has a two-layer
structure of a silver foil 16 and a copper foil 17, and the silver foil 16 is formed by printing and
applying silver paste on the plate-like piezoelectric ceramic element 14, and the copper foil 17 is
attached thereon. Will be attached.
[0004]
The holder 21 is provided with two slits 22 sandwiching the piezoelectric ceramic diaphragms
11 and 12. The piezoelectric ceramic diaphragms 11 and 12 are inserted into the slits 22 and
adhesively fixed, and the longitudinal center is held by the holder 21 respectively. A wide base
portion 23 is provided on one end side of the piezoelectric ceramic diaphragms 11 and 12 of the
holder 21 in the stacking direction, and the bottom surface of the base portion 23 parallel to the
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2
plate surface of the piezoelectric ceramic diaphragms 11 and 12 is flat. It is considered as the
paste surface to the panel. The piezoelectric actuator 10 is attached to the flat panel 31 of the
main body case 32 covering the display surface of the portable electronic device. The
piezoelectric actuator 10 is disposed along one side of the flat panel 31, and the base 23 of the
holder 21 is pasted and attached to the flat panel 31. The flat panel 31 is made of a transparent
resin plate such as polycarbonate and acrylic. A printed wiring board 33 is accommodated in the
main body case 32. The reference numeral 18 denotes a lead for connecting the piezoelectric
actuator 10 to the printed wiring board 33, and two leads 18 are drawn from the electrodes 13
and 15. The electrode thin plates 13 and the electrode foils 15 of the two piezoelectric ceramic
diaphragms 11 and 12 of the piezoelectric actuator 10 are appropriately connected by lead
wires. An impact absorbing member 34 intervenes between the flat panel 31 and the main body
case 32, whereby the transmission of the vibration of the flat panel 31 to the main body case 32
is blocked.
[0005]
By the way, in a flat panel speaker in which a piezoelectric actuator 10 using a piezoelectric
ceramic diaphragm is attached to a flat panel and the flat panel is driven by the piezoelectric
actuator 10 to emit sound waves into space, plate-shaped piezoelectric ceramic elements and
both sides thereof. There has also been developed a flat panel speaker itself in which the
piezoelectric actuator 10 is modularized by housing the arranged electrode foils and an impact
absorbing member in a module case 20 (see Patent Document 2). JP 2004-104327 JP 2000201398
[0006]
In the piezoelectric actuator 10 described above, the plate-like piezoelectric ceramic element 14
of the piezoelectric ceramic diaphragms 11 and 12 is in the form of a thin plate, on which the
ceramic material such as PZT which is its constituent material is a very fragile material. From the
point of view, the piezoelectric ceramic element 14 is likely to be damaged by an impact applied
during a fall or the like. Corresponding to this, in the above-mentioned patent document 1, the
design which arrange | positions an impact-absorbing member in the both-plates surface of the
piezoelectric ceramic diaphragms 11 and 12 and implements this damage is implemented. The
present invention has been made in view of the above problems, and provides a flat panel
speaker having an impact resistant structure, which more appropriately carries out the
mitigation of the impact on the piezoelectric ceramic diaphragm.
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[0007]
Claim 1: The piezoelectric ceramic diaphragm 11 comprising the plate-like piezoelectric ceramic
element 14 and the electrode foil disposed on one side thereof and the electrode thin plate 13
disposed on the other side, and the shock absorption disposed on both sides thereof In a flat
panel speaker in which the member 34 is housed in a module case 20 and the piezoelectric
actuator 10 is modularized and joined and fixed to a flat panel, a cantilever holder 21 'having a
base 23 is provided. The piezoelectric ceramic diaphragm 11 is joined to the surface on the
opposite side to the surface on which the base portion 23 is provided, and the shock absorbing
member 34 is disposed on one side of the piezoelectric ceramic diaphragm 11 in the module
case 20. A surface is formed on the inner surface with a gap, and the surface on the opposite side
to the surface to which the piezoelectric ceramic diaphragm 11 of the cantilever holder 21 'is
joined. To constitute a flat panel speaker which is formed with a gap on the inner surface of the
opposing module case 20.
[0008]
Claim 2: The piezoelectric ceramic diaphragm 11 comprising the plate-like piezoelectric ceramic
element 14 and the electrode foil disposed on one surface thereof and the electrode thin plate 13
disposed on the other surface, and the shock absorption disposed on both sides thereof In a flat
panel speaker in which the piezoelectric actuator 10 formed by modularizing the member 34 in
the module case 20 is joined and fixed to the flat panel, the upper holding plate 211, the lower
holding plate 212, and both holding plates parallel to each other are one end The center of the
piezoelectric ceramic diaphragm 11 is provided in a gap formed by the upper holding plate 211
and the lower holding plate 212 of the cross-sectionally U-shaped holder 21 and the holder 21
having the cross-sectional U-shape. Parts are fixedly fitted, and the shock absorbing members 34
are joined and fixed to the upper and lower surfaces of the both ends of the piezoelectric ceramic
diaphragm 11, respectively. The thickness of 34 is set slightly thinner than the thickness of the
upper retaining plate 211 and the lower holding plate 212 of the holder 21, and constitutes a flat
panel speaker joined fixed to the lower surface of the lower retaining plate 212 on the inner
surface of the module case 20.
[0009]
In a third preferred embodiment of the flat panel speaker according to the second aspect of the
present invention, the shock absorbing members 34 are disposed on both the upper and lower
sides of the piezoelectric ceramic diaphragm 11 corresponding to both ends of the piezoelectric
ceramic diaphragm 11, The flat panel speaker joined and fixed to the module case 20 side was
comprised.
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In a fourth preferred embodiment of the flat panel speaker according to the present invention,
the reinforcing thin plate 141 for reinforcing the plate-like piezoelectric ceramic element 14 is
joined to the piezoelectric ceramic diaphragm 11, and the external dimensions of the reinforcing
thin plate 141 are the piezoelectric ceramic diaphragm 11. The flat panel speaker is configured
such that the impact absorbing member 34 is bonded and fixed to both sides of the reinforcing
thin plate 141 instead of bonding and fixing the shock absorbing member 34 to the module case
20 side.
[0010]
The piezoelectric ceramic diaphragm 11 comprising the plate-like piezoelectric ceramic element
14 and the electrode foil disposed on one surface thereof and the electrode thin plate 13
disposed on the other surface, and the shock absorption disposed on both sides thereof In a flat
panel speaker in which the piezoelectric actuator 10 modularized by housing the member 34 in
the module case 20 is joined and fixed to the flat panel, the shock absorbing member 34 is
formed on one surface of the piezoelectric ceramic diaphragm 11 and piezoelectric ceramic
vibration is generated. A flat panel speaker formed with a gap on the inner surface of the module
case 20 facing the other surface of the plate 11 was configured.
[0011]
A piezoelectric ceramic diaphragm 11 comprising the plate-like piezoelectric ceramic element 14
and the electrode foil disposed on one surface and the electrode thin plate 13 disposed on the
other surface, and shock absorption disposed on both sides thereof In a flat panel speaker in
which the piezoelectric actuator 10 formed by modularizing the member 34 in the module case
20 is joined and fixed to the flat panel, the upper holding plate 211, the lower holding plate 212,
the upper holding plate 211, and the lower holding parallel to each other A holder 21 having a
U-shaped cross-section including an intermediate holding plate 214 formed in the middle of the
plates 212 and a connecting plate 213 connecting three holding plates at one end, The center
portion of the piezoelectric ceramic diaphragm 11 is fitted and fixed in the gap formed by the
upper holding plate 211 and the intermediate holding plate 214 of the The center portion of the
second piezoelectric ceramic diaphragm 11 ′ is fitted and fixed in the gap formed by the lower
holding plate 212 and the lower holding plate 212, and the shock absorbing member 34 is joined
to the upper surfaces of both ends of the piezoelectric ceramic diaphragm 11. The impact
absorbing members 34 are fixed by bonding to the lower surfaces of both ends of the second
piezoelectric ceramic diaphragm 11 ′ and the lower surfaces of the piezoelectric ceramic
diaphragm 11 and the second piezoelectric ceramic diaphragm 11. The shock absorbing member
34 is bonded and fixed to the upper surface of each of the both ends of the ', and the thickness of
the shock absorbing member 34 is set slightly smaller than the thickness of the upper holding
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plate 211 and the lower holding plate 212 of the holder 21 A flat panel speaker in which the
lower surface of the plate 212 was joined and fixed to the inner surface of the module case 20
was configured.
[0012]
The present invention and the invention described in Patent Document 1 are common in that an
impact absorbing member is disposed in the vicinity of the diaphragm surface of the piezoelectric
actuator.
However, in the present invention, the piezoelectric actuator is housed in a module case and
modularized, and the whole structure including the vibration absorbing plate surface of the
piezoelectric actuator, the shock absorbing member attached to the inner surface of the module
case opposite thereto, and the module case itself The shock absorption effect of the plate-like
piezoelectric ceramic element of the diaphragm is effective even if the shock that occurs in other
cases when the portable electronic device attached with the piezoelectric actuator falls is
transmitted to the piezoelectric actuator by the buffer action integrated Thus, the impact
resistance is improved, the handling of the assembly mounting is facilitated, and the stabilization
of the acoustic characteristics is achieved.
[0013]
The piezoelectric actuator according to the present invention is preferably used as a piezoelectric
electroacoustic transducer attached to a protective flat panel of a portable electronic device such
as a mobile phone, PDA, PC, etc. and vibrating the protective flat panel to radiate a sound wave
into space. It is.
Also, as another embodiment, the piezoelectric actuator of the present invention is attached to
the display device (display panel as an example) of a portable electronic device such as a mobile
phone, PDA, PC, etc., and used as a diaphragm of a flat speaker. The display panel may be
vibrated to emit sound waves into space, and the same effect can be expected.
[0014]
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The best mode for carrying out the invention will be described with reference to the
embodiments shown in the drawings.
In the embodiments, the reference numerals common to the reference numerals in the
conventional example indicate members common to each other. The piezoelectric ceramic
diaphragm illustrated and described with reference to FIG. 9 can be implemented in one or two
type. Further, a reinforcing thin plate 141 for reinforcing the plate-like piezoelectric ceramic
element 14 is also bonded to the piezoelectric ceramic diaphragm 11. 1 (a) shows a top view of
the module, FIG. 1 (b) shows a side view of the module, and FIG. 1 (c) shows a bottom view of the
module. 1 (d) is a cross-sectional view along line A-A, FIG. 1 (e) (i) is a cross-sectional view along
line B-B, and FIG. 1 (e) (b) is a line It is a figure which shows the cross section along C. FIG. FIG. 2
(f) is an enlarged view of a region encircled by a circle A in FIG. 1 (d), and FIG. 2 (g) is a view
showing a module case joined to a flat panel.
[0015]
Here, 20 is a module case, which comprises an upper case 20U and a lower case 20L. Reference
numeral 201 denotes a case opening formed in the lower case 20L. The cantilevered holder 21
′ exposes the lower surface of the base 23 in a state in which the base 23 is fitted in the case
opening 201 formed in the lower case 20 L of the module case 20. The piezoelectric ceramic
diaphragm 11 including the plate-like piezoelectric ceramic element 14 is laminated and bonded
to the surface of the holder 21 opposite to the surface on which the base 23 is provided. The
shock absorbing member 34 is formed with a gap on the inner surface of the module case 20
opposite to one surface of the piezoelectric ceramic diaphragm 11 and opposite to the surface of
the holder 21 on which the piezoelectric ceramic diaphragm 11 is to be laminated and joined. A
gap is formed on the inner surface of the module case 20 opposite to the side surface. The shock
absorbing member 34 can be made of polyurethane or polyethylene foam.
[0016]
In the above embodiment, the piezoelectric actuator 10 is housed in the module case 20 and
modularized, and the shock absorbing member is attached to the surface of the piezoelectric
ceramic diaphragm 11 of the piezoelectric actuator 10 and the inner surface of the module case
20 opposite thereto. 34. Due to the configuration including the inner surface of the module case
20 itself, the portable electronic device to which the flat panel speaker is attached is dropped,
and even if an impact generated when it is hit is transmitted to the flat panel speaker, plateshaped piezoelectric ceramic The breakage accident of the element 14 is effectively prevented,
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the impact resistance is improved, the handling of the assembled mounting is facilitated, and the
stabilization of the acoustic characteristics is achieved.
[0017]
A second embodiment will be described with reference to FIG.
3 (a) (a) is a perspective view of the holder, FIG. 3 (a) (b) is a perspective view of the assembled
piezoelectric actuator, and FIG. 3 (a) (c) is a perspective view of the module case. FIG. 3 (b) is a
view showing the module case joined to a flat panel, and FIG. 3 (c) is an enlarged view of a region
surrounded by a circle A in FIG. 3 (b). Example 2 of FIG. 3 is a piezoelectric actuator 10 of a
center support structure. That is, the holder 21 having a U-shaped cross section is used as the
holder. The U-shaped cross section holder 21 comprises an upper holding plate 211 and a lower
holding plate 212 parallel to each other, and a connecting plate 213 connecting the both holding
plates at one end. The central portion of the piezoelectric ceramic diaphragm 11 is fitted and
fixed in a gap formed by the upper holding plate 211 and the lower holding plate 212 of the
holder 21 having a U-shaped cross section. Further, impact absorbing members 34 are bonded
and fixed to the upper and lower surfaces of each end of the piezoelectric ceramic diaphragm 11.
The thickness of the shock absorbing member 34 is set to be slightly smaller than the thickness
of the upper holding plate 211 and the lower holding plate 212 of the holder 21. The lower body
of the lower holding plate 212 is joined and fixed to the inner surface of the lower case 20L,
which is an assembly composed of the piezoelectric ceramic diaphragm 11, the holder 21 and
the shock absorbing member 34 assembled as described above. When the lower surface of the
lower holding plate 212 is joined and fixed to the inner surface of the lower case 20L, the upper
case 20U is fitted and fixed to the lower case 20L, whereby the assembly of the piezoelectric
actuator 10 is completed. From the place where the thickness of the shock absorbing member 34
is set to be slightly smaller than the thickness of the upper holding plate 211 and the lower
holding plate 212 of the holder 21, the lower case 20L and the upper side in the state where the
assembly of the piezoelectric actuator 10 is completed. A slight gap is formed between the inner
surface of the case 20U and the shock absorbing member 34.
[0018]
According to the second embodiment, when an impact is applied to the piezoelectric actuator 10,
vibration is transmitted to the piezoelectric ceramic diaphragm 11 via the module case 20 and
the holder 21. The piezoelectric ceramic diaphragm 11 is a module case due to this vibration. I
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8
collide with 20. In this case, the shock absorbing member 34 and the module case 20 to which
the shock absorbing member 34 is joined and fixed have a combined action, and the shock to the
plate-shaped piezoelectric ceramic element 14 of the piezoelectric ceramic diaphragm 11 is
alleviated. A third embodiment will be described with reference to FIG. The third embodiment of
FIG. 4 corresponds to the shock absorbing member 34 corresponding to both ends of the
piezoelectric ceramic diaphragm 11 including the plate-like piezoelectric ceramic element 14 on
the module case 20 side, ie, the upper case 20U and the lower case 20L. It is the piezoelectric
actuator 10 joined and fixed to the side.
[0019]
According to the third embodiment, when an impact is applied to the piezoelectric actuator 10,
vibration is transmitted to the piezoelectric ceramic diaphragm 11 joined to each other, and the
piezoelectric ceramic diaphragm 11 is joined and fixed to the module case 20 side. The collision
occurs with the shock absorbing member 34, but the combined action of the shock absorbing
member 34 and the module case 20 to which the shock absorbing member 34 is joined and fixed
functions well, and the shock to the piezoelectric ceramic diaphragm 11 and the plate-like
piezoelectric ceramic element 14 is well relieved. A fourth embodiment will be described with
reference to FIG. In the fourth embodiment of FIG. 5, reinforcement is provided to reinforce the
plate-like piezoelectric ceramic element 14 in the case where the shock absorbing members 34
are disposed on both the upper and lower sides of the piezoelectric ceramic diaphragm 11
corresponding to both ends of the plate-like piezoelectric ceramic element 14. The piezoelectric
actuator 10 is a piezoelectric actuator 10 in which the thin plate 141 is joined to the
piezoelectric ceramic diaphragm 11 including the plate-like piezoelectric ceramic element 14 and
the shock absorbing member 34 is joined and fixed to upper and lower sides of both ends of the
reinforcing thin plate 141. The external dimensions of the reinforcing thin plate 141 are
designed and manufactured to be large compared with the plate-like piezoelectric ceramic
element 14.
[0020]
According to the fourth embodiment, even if vibration is transmitted to the piezoelectric ceramic
diaphragm 11 and the reinforcing thin plate 141 joined to each other when an impact is applied
to the piezoelectric actuator 10, the shock absorbing member 34 and the reinforcing thin plate
141 The impact absorbing member 34 and the piezoelectric ceramic diaphragm 11 do not
collide directly with each other, and the impact on the plate-like piezoelectric ceramic element 14
is greatly alleviated. Fifth Embodiment A fifth embodiment will be described with reference to
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FIG. The fifth embodiment of FIG. 6 corresponds to the second embodiment of FIG. 3 in which
two plate-shaped piezoelectric ceramic elements 14 are used.
[0021]
The U-shaped cross-section holder 21 includes an intermediate holding plate 214 formed
between the upper holding plate 211, the lower holding plate 212, the upper holding plate 211,
and the lower holding plate 212 parallel to each other, and three holding plates. Are connected at
one end. Then, the central portion of the piezoelectric ceramic diaphragm 11 is fitted and fixed in
the gap formed by the upper holding plate 211 and the intermediate holding plate 214 of the
holder 21 having a U-shaped cross section, and the intermediate holding plate 214 and the lower
holding plate 212 The central portion of the second piezoelectric ceramic diaphragm 11 'is fitted
and fixed in the formed gap. The shock absorbing member 34 is joined and fixed to the upper
surfaces of the both ends of the piezoelectric ceramic diaphragm 11 and the shock absorbing
members 34 are joined and fixed to the lower surfaces of the both ends of the second
piezoelectric ceramic diaphragm 11 '. The impact absorbing members 34 are bonded and fixed to
the lower surfaces of both ends of the diaphragm 11 or the upper surfaces of both ends of the
second piezoelectric ceramic diaphragm 11 ′. The thickness of the shock absorbing member 34
is set to be slightly smaller than the thickness of the upper holding plate 211 and the lower
holding plate 212 of the holder 21, and the lower surface of the lower holding plate 212 is
joined and fixed to the inner surface of the module case 20.
[0022]
Also in the case of the fifth embodiment, when an impact is applied to the piezoelectric actuator
10, the vibration is transmitted to the plate-like piezoelectric ceramic element 14 through the
module case 20 and the holder 21, but in the same manner as the second embodiment The
combined action of the absorbing member 34 and the module case 20 to which the absorbing
member 34 is bonded and fixed reduces the impact on the plate-like piezoelectric ceramic
element 14. Sixth Embodiment A sixth embodiment will be described with reference to FIG.
Example 6 of FIG. 7 does not have a special holder. 7 (a) shows the top of the module, FIG. 7 (b)
shows the side of the module, FIG. 7 (c) shows the bottom of the module, and FIG. 7 (d) shows the
line AA FIG. 7 (e) is a cross-sectional view taken along line B-B, and FIG. 7 (f) is an enlarged view
of a region surrounded by a circle A in FIG. 7 (d).
[0023]
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10
Here, the upper impact absorbing member 34 is divided into three and joined and fixed to the
inner surface of the upper case 20U. The lower impact absorbing member 34 is joined and fixed
to the inner surface of the lower case 20L. The piezoelectric ceramic diaphragm 11 including the
plate-like piezoelectric ceramic element 14 is bonded and held to the upper impact absorbing
member 34. A gap is formed between the lower surface of the piezoelectric ceramic diaphragm
11 and the upper surface of the lower impact absorbing member 34. In the above-described sixth
embodiment, the piezoelectric ceramic diaphragm 11 including the plate-like piezoelectric
ceramic element 14 is joined and fixed to the upper case 20U of the module case 20 via the
upper shock absorbing member 34 and the same. The external vibration entering from the
module case 20 is absorbed by the interposed upper impact absorbing member 34 and largely
damps until it is transmitted to the plate-like piezoelectric ceramic element 14.
[0024]
The piezoelectric actuator of the present invention described above is a piezoelectric type electric
device that is used by attaching it to a protective flat panel of a portable electronic device such as
a mobile phone, PDA, PC, etc. and vibrating the protective flat panel to emit sound waves into
space. It is suitable as an acoustic transducer. Further, as another embodiment, the piezoelectric
actuator of the present invention is attached to a display device of a portable electronic device
such as a mobile phone, PDA, PC, or the display panel itself as an example, and used as a
diaphragm of a flat speaker. The panel may be vibrated to emit sound waves into space, and
similar effects can be expected.
[0025]
The figure explaining an Example. The continuation of FIG. FIG. 7 is a diagram for explaining a
second embodiment. FIG. FIG. 8 is a diagram for explaining a fourth embodiment. FIG. 8 is a
diagram for explaining a fifth embodiment. FIG. 14 is a diagram for explaining a sixth
embodiment. The figure explaining the prior art example of a piezoelectric actuator. The
perspective view which disassembled and showed the piezoelectric ceramic diaphragm. The
figure which shows the place which attached the piezoelectric actuator to the flat panel. The
continuation of FIG.
Explanation of sign
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11
[0026]
DESCRIPTION OF SYMBOLS 10 piezoelectric actuator 11, 12 piezoelectric ceramic diaphragm 13
electrode thin plate 14 plate-like piezoelectric ceramic element 141 reinforcement thin plate 15
electrode foil 16 silver foil 17 copper foil 18 lead wire 20 module case 20U upper case 20L
lower case 201 case opening 21 cross section Shaped holder 21 'cantilever beam shaped holder
211 upper holding plate 212 lower holding plate 213 connecting plate 214 intermediate holding
plate 22 slit 23 base 31 flat panel 32 main case 33 printed wiring board 34 shock absorbing
member
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