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JPH0946793

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DESCRIPTION JPH0946793
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
piezoelectric element which is used as an acoustic device such as a receiver of a telephone or
other communication device using a piezoelectric element and a piezoelectric acoustic device
using the same.
[0002]
2. Description of the Related Art A conventional piezoelectric acoustic device accommodates a
piezoelectric element in a tray-like case having a step-like piezoelectric element support at an
intermediate portion on the inner peripheral side, and supports the piezoelectric element at the
periphery of the diaphragm. It is placed on the part and fixed with an adhesive. The piezoelectric
element is one in which one of the electrodes provided on both sides of a plate-like piezoelectric
body is attached to the surface of the diaphragm, and lead wires are connected to the electrode
on the piezoelectric element and the diaphragm, respectively. Is pulled out from the case.
[0003]
Such a piezoelectric acoustic device is incorporated in an electronic device such as a cellular
phone or a so-called cordless phone, and is accommodated in a housing of the electronic device
and attached with a screw or the like in consideration of exchangeability in the case of failure.
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Further, the lead wire is connected to the circuit board in the housing by solder or the like. In
addition to the piezoelectric acoustic device connected by such a lead wire, a conductor pin
provided in the case is brought into contact with the diaphragm and the electrode of the
piezoelectric element without the lead wire. Some are intended to connect with the circuit. This
piezoelectric acoustic device is also housed in the housing of the electronic device and is also
fixed with a screw or the like.
[0004]
However, in the case of the piezoelectric acoustic device as described above, since it is necessary
to screw the case attached with the piezoelectric element in the housing, it takes time to
incorporate the case into the housing. In addition, when replacing, it is necessary to loosen and
remove the screw and to fix a new one again, which is bothersome and troublesome.
Furthermore, in the case of connecting to a circuit by a lead wire, soldering of the lead wire is
required when the case with the piezoelectric element attached is attached to the housing. Even
in the case of replacing the piezoelectric element, it is necessary to melt the solder of the lead
wire and separate it from the circuit and to re-sold a new one again, so that it takes much time in
either case.
[0005]
In view of the above-mentioned conventional problems, the present invention provides a
piezoelectric acoustic device which is easy to attach a case having a piezoelectric element
attached thereto to an electronic device, requires no effort, and does not require any effort to
connect to a circuit. Do. This aims at facilitating the assembly of the electronic device or the
replacement of the piezoelectric element.
[0006]
According to the present invention, in order to achieve the above object, a projection 3 is
provided on the periphery of the diaphragm 21 of the piezoelectric element 2, and the
diaphragm 21 is provided on the main surface of the projection 3. And the lead-out electrode 15
electrically connected to the vibration plate 21 of the piezoelectric body 22 in a state of being
insulated from the lead-out electrode 15, and the lead-out electrode 15 and the projection 3 are
conductor portions 16, 16 of the connection block 12 having elasticity. It electrically connected
with the circuit pattern 38 of the circuit board 36 accommodated in the housing of the electronic
device through ....
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[0007]
DESCRIPTION OF THE PREFERRED EMBODIMENTS The piezoelectric element 2 has one of the
electrodes provided on both main surfaces of a plate-like piezoelectric body 22 fixed to the main
surface of a metal plate-like diaphragm 21 and electrically connected. And the other part of the
piezoelectric body 21 which is not fixed to the vibrating plate 21 of the piezoelectric body 22
while being drawn out on the projecting portion 3 in a state of being insulated from the
protruding plate 3 and the vibrating plate 21. And an extraction electrode 15 electrically
connected to the electrode 23.
[0008]
The piezoelectric acoustic device uses the piezoelectric element 2 as described above, and is
attached to the case 1 so that the main surface side of the protrusion 3 provided with the leadout electrode 15 faces outward.
Furthermore, the case 1 to which the piezoelectric element 2 is attached in this manner is
attached to the inside of the housing of the electronic device, and the conductor portion 16 is
provided on the connection block 12 where the projection 3 and the lead electrode 15 have
elasticity. 16... Are respectively connected to the circuit patterns 38, 38 of the circuit board 36
mounted in the housing.
In this case, while the case 1 to which the piezoelectric element 2 is attached is held inside the
housing of the electronic device, the connection block 12 is between the protrusion 3 supported
by the support portion 4 of the case 1 and the circuit board 36 Is given a compressive stress to
the The connection block 12 is an elastic block in which a plurality of conductor portions 16,
16... Are arranged to be insulated from each other at regular intervals on at least the surface
thereof. When the piezoelectric acoustic device is incorporated into the housing of the electronic
device, the case 1 has holding means for holding the connection block 12 in order to temporarily
fix the connection block 12.
[0009]
In the piezoelectric acoustic device described above, the surface of the lead-out electrode 12 and
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the projection 3 provided on the projection 3 of the diaphragm 21 is connected to the circuit
pattern 38 of the circuit board 36 using the connection block 12 having elasticity. And soldering
of lead wires is unnecessary. Then, since the case 1 to which the piezoelectric element 2 is
attached is held inside the housing of the electronic device, fixing of the case 1 by screws or the
like is also unnecessary. That is, the case 1 having the piezoelectric element 2 attached thereto is
incorporated in the housing and the housing is fixed to each other in a predetermined state, and
the case 1 having the piezoelectric element 2 attached thereto is held within the housing of the
electronic device The block 12 is held between the projection 3 supported by the support 4 of
the case 1 and the circuit board 36 by applying a compressive stress. Also, if the housing is
disassembled, the case 1 can be easily separated from this assembled state. This facilitates
assembly and disassembly of the piezoelectric acoustic device.
[0010]
The connection block 12 is an elastic block in which a plurality of conductor portions 16, 16...
The diaphragm 21 and the electrode 23 of the piezoelectric body 22 can be easily connected to
the circuit pattern 38 of the circuit board 36 by providing a compressive stress between the
projection 3 and the circuit board 36 for sandwiching. In particular, when the case 1 has the
holding means for holding the connection block 12, the connection block 12 can be temporarily
fixed when the piezoelectric acoustic device is incorporated in the housing of the electronic
device, so that the incorporation of the piezoelectric acoustic device is easier. become.
[0011]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring now to the drawings,
the embodiments of the present invention will be described in detail and specifically. 1 to 5 show
an embodiment in which the present invention is applied to a piezoelectric receiver. Here, the
case 1 is formed of a resin or the like in a tray shape having an open upper surface side, and a
sound release hole 11 consisting of a plurality of small holes is opened at the center of the
bottom surface. The sound output hole 11 can be selected in various shapes according to the
sound pressure characteristics to be obtained, and a damper cloth or the like may be stretched in
the large diameter sound output hole 11. An electrode holding portion 4 is provided to project
from a part of the peripheral wall 5 of the case 1. The electrode holding portion 4 is in the form
of a groove having an inner dimension corresponding to the dimension of the projection 3
provided to project from the peripheral portion of the diaphragm 21 of the piezoelectric element
2 described later. Protruding in the direction. A stepped portion 6 for supporting the peripheral
portion of the diaphragm 21 of the piezoelectric element 2 is formed over the entire
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circumference except the portion of the lead wire lead-out groove 4 at the middle portion in the
height direction of the inner surface of the peripheral wall 5 of the case 1 ing.
[0012]
As shown in FIGS. 2 to 5, the piezoelectric element 2 has electrodes 24 (only the electrode layer
on the visible side is shown in FIGS. 2 to 5) on both main surfaces of a plate-like piezoelectric
body 22 made of piezoelectric ceramic or the like. The first electrode of the piezoelectric body 22
is fixed on the metal diaphragm 21 and electrically connected. The diaphragm 21 and the
piezoelectric body 22 of the piezoelectric element 2 according to the illustrated embodiment are
circular. The diameter of the diaphragm 21 of the piezoelectric element 2 is slightly larger than
the inner diameter of the step 6 of the case 1 and slightly smaller than the inner diameter of the
peripheral wall 5 in the upper part of the step 6.
[0013]
As shown in FIGS. 1 to 5, the projection 3 is provided to project from the peripheral portion of
the diaphragm 21, and the projection 3 shown in the drawing is projected in the radial direction
of the diaphragm 21. A band-shaped insulating layer 14 is formed from the electrode 23 of the
piezoelectric body 22 to the projection 3, and a band-shaped lead-out electrode 15 made of a
conductive film is formed on the insulating layer 15. The lead-out electrode 15 extends beyond
the edge of the end of the insulating layer 14 on the electrode 23 side of the piezoelectric body
22, and this end is electrically connected to the electrode 23. As shown in FIG. 5, the insulating
layer 14 and the lead-out electrode 15 are formed to be biased to one side of the protrusion 3,
and the metal surface is exposed on the other side of the protrusion 3. In FIG. 5, the width of the
extraction electrode 15 is represented by B, and the width of the exposed portion of the metal
surface of the protrusion 3 is represented by B '. Furthermore, the margin between the edge of
the extraction electrode 15 and the edge of the insulating layer 14 is represented by A.
[0014]
Furthermore, in this piezoelectric acoustic device, the connection block 12 as shown in FIG. 4 and
FIG. 5 is prepared. The connection block 12 is, for example, an elastic block commercially
available under trade names such as those disclosed in JP-B-56-48951 and the like, and for
example, it is insulated on at least a surface of an elastic body. The portions 13 and the
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5
conductor portions 16 are alternately arranged at a constant pitch. For example, a laminate of
alternately laminated insulators having a certain thickness having elasticity and conductors
having a certain thickness having elasticity, or metallizing the surface of a block made of an
elastic material in a strip shape at certain intervals. It is made.
[0015]
The width of the connection block 12 is slightly larger than the inner dimension of the electrode
support portion 4 of the case 1, the width of the insulating portion 13 is represented by b in FIG.
5, and the width of the conductor portion 16 is It is represented by a. Here, in relation to the
dimensions of the metal surface portion of the lead-out electrode 15, the insulating layer 14 and
the protrusion 3 described above, the relationship of A> a, B> b, B ′> b is established.
[0016]
In order to incorporate such a piezoelectric element 2 into the case 1, first, along the step 6 on
the inner peripheral side of the peripheral wall 5 of the case 1 having the sound output hole 11
provided with damper means such as a damper cloth or a pin hole damper. An adhesive such as a
silicone adhesive is uniformly applied in advance. Next, the piezoelectric element 2 is housed
inside the case 1 with the piezoelectric body 22 side up, and the peripheral portion of the
diaphragm 21 of the piezoelectric element 2 is placed on the step 6 and bonded and fixed with
an adhesive. At this time, the protrusion 3 is fitted into the electrode support 4 of the case 1.
Here, the sound emission hole 11 can select an appropriate shape and structure depending on
the acoustic characteristics to be obtained. A state in which the piezoelectric element 2 is
attached to the case 1 in this manner is shown in FIG.
[0017]
FIG. 1 shows a housing of an electronic device such as a cellular phone or a cordless phone
incorporating the case 1 to which the piezoelectric element 2 is attached in this manner. The
housing shown in FIG. 1 is composed of a pair of half members 31 and 37, and assembling the
housing completes the housing. A case mounting portion 34 shaped like a peripheral wall is
provided upright inside one half member 31 constituting the housing, and the inside diameter of
the case mounting portion 34 is slightly larger than the outside diameter of the case 1. A recess
40 corresponding to the outer width of the electrode support 4 of the case 1 is provided in a part
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of the case attachment 34. A sound output hole 32 is formed at the center of a portion
surrounded by the case attachment portion 34 of the half member 31, and a waterproof sheet for
waterproofing, a cloth for dust resistance, etc. are affixed to this sound output hole 32, if
necessary. May be
[0018]
Inside the other half member 37 constituting the housing, the circuit board 36 is held by the
substrate support portion 41 protruding from the inner surface, and the piezoelectric element 2
is mounted on the lower surface of the circuit board 36 in FIG. Circuit patterns 38, 38 (see FIG.
2) to be connected to the diaphragm 21 side and the electrode 23 side of the above are formed.
In FIG. 1, reference numeral 39 denotes a circuit component mounted on the circuit board 36,
and a circuit for driving the piezoelectric element 2 and the like are configured on the circuit
board 36.
[0019]
In order to assemble the case 1 having the piezoelectric element 2 as described above mounted
in the housing, first, as shown in FIG. 1A, one half member 31 is disposed so that the case
mounting portion 34 faces upward. A ring-shaped elastic member 35 such as an O-ring is fitted
to the inner bottom of the case mounting portion 34. Next, the case 1 is fitted in the case
attachment portion 34 with the piezoelectric element 2 facing upward, and the electrode support
portion 4 is fitted in the recess 40 of the case attachment portion 34.
[0020]
Next, the connection block 12 is fitted inside the electrode support 4 of the case 1. Since the
width of the connection block 12 is slightly larger than the inner dimension of the electrode
support portion 4, the connection block 12 is slightly compressed in the width direction and
fitted. As a result, the connection block 12 is temporarily fixed in the groove of the electrode
support 4 and the connection block 12 does not come off. In this state, the other half member 37
is superimposed on one half member 31, and the two halves 31 and 37 are fixed by screws or
the like (not shown) to assemble the housing.
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[0021]
When the housing is assembled in this manner, as shown in FIG. 1B, the case 1 is held between
the two halves 31 and 37 in a state in which the elastic member 35 is compressed in the height
direction. . In particular, in the illustrated embodiment, the substrate supporting portion 41 to
which the circuit board 36 is attached presses the case 1 downward, and the elastic member 35
is compressed by the pressing force and the reaction force from the half 31 thereof. There is.
Therefore, the case 1 is fixed in the housing without using a fastening member such as a screw.
Also, the circuit board 36 does not hit the case 1 and does not bend because it receives no
reaction force. Furthermore, in this state, the connecting block 12 is also slightly compressed in
the height direction and fixed. Then, the lead electrode 15 and the metal surface portion of the
projection 3 are connected to the circuit pattern 38 (see FIG. 2) of the circuit board 36 through
the conductor portion 16 (see FIGS. 4 and 5) of the connection block 12 Be done. Thereby, the
piezoelectric element 2 is connected to a circuit for driving the piezoelectric element 2 formed on
the circuit board 36. Here, a plurality of through holes are provided in the circuit board 36 so as
not to disturb the vibration of the piezoelectric element 2, or a groove is provided in at least one
of the contact surfaces of the case 1 and the circuit board 36 to ensure air permeability.
desirable.
[0022]
Another example of the protrusion 3 of the diaphragm 21 is shown in FIG. That is, in FIG. 6A, the
lead-out electrode 15 is formed on the protrusion 3, and the conductive film 15 ′ similar to the
lead-out electrode 15 is formed on the metal surface portion on the side thereof. This is because
a step is generated between the metal surface portion by the insulating layer 14 and the lead-out
electrode 15 on one side of the protrusion 3, so that the conductor film 15 'is formed in order to
eliminate the step. By eliminating the step, the compression strain of the connection block 12 is
prevented from being biased to a specific point. Further, in FIG. 6B, the width of the insulating
layer 14 is formed wide at the step portion at the edge of the piezoelectric body 22 on the
diaphragm 21. Thereby, it is possible to more reliably insulate from the diaphragm 21 in
accordance with the diffusion of the printing sag at the step portion of the lead-out electrode 15
due to the spreading.
[0023]
Another example of the electrode support portion 4 of the case 1 is shown in FIG. That is, in FIG.
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7A, the projections 17, 17... Are provided on the tip and both sides without making the electrode
supporting part 4 groove-shaped, and the connection block 12 is deformed and fitted into the
projections 12. It is fixed. As compared with fitting the connection block 12 into the grooved
electrode support 4, the connection block 12 can be easily assembled. Further, in FIG. 7B, the
electrode support portion 4 is formed into a flat plate shape without forming a groove shape, and
two protrusions 18 and 18 are provided so as not to overlap with the protrusions of the
diaphragm 21. , 18 are fitted in the holes provided in the connecting block 12 to hold the same
block 12. Again, as compared with fitting the connection block 12 into the groove-shaped
electrode support 4, the connection block 12 can be easily assembled.
[0024]
FIGS. 8 and 9 show other examples of the temporary fastening means of the connection block 12.
That is, in FIG. 8, a slit 19 is provided laterally in the center of the connection block 12, and the
projection 3 of the diaphragm 21 is inserted into the slit 19 to temporarily fix the connection
block 12. In this case, in order to prevent the connection block 12 from coming off, jaw-like
projections 10, 10 called so-called "returns" are provided on both sides of the tip of the
projection 3. Further, in FIG. 9, a notch 20 is provided in the lower half of the center of the
connection block 12, and the projection 3 of the diaphragm 21 is inserted into the notch 20 to
temporarily fix the connection block 12. In this case, in order to prevent the connection block 12
from coming off, jaw-like projections 10, 10, which are called "returns" similar to the above, are
provided on both sides of the middle part of the projection 3. The projections 10, 10 are
provided offset on both sides of the projection 3. In either case, the connection block 12 can be
easily assembled as compared with fitting the connection block 12 into the grooved electrode
support 4. Also in the examples shown in FIGS. 8 and 9, it is preferable to instruct the lower
surface side of the projection 3 of the diaphragm by the electrode designation unit 4 directly or
through another member.
[0025]
FIG. 10 shows another embodiment of the present invention, in which an elastic surface is
provided with an adhesive surface on one side or both sides of a base material 42 such as butyl
rubber or acrylic foam instead of an O-ring. I use it. By using the elastic member 35 having such
an adhesive surface, the case 1 can be temporarily fixed to one half 31 of the housing at the time
of assembly. Also, even after assembly, the case 1 can be stably and stably held in the housing.
04-05-2019
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[0026]
FIG. 11 shows an example of such an elastic member. The thing of the figure (a) is what apply |
coated the adhesive 43 directly on both surfaces of base materials 42, such as butyl rubber and
an acrylic foam. On the other hand, in FIG. 11B, adhesive tapes are attached to both sides of the
base material 42. That is, the adhesive 43, 43 is applied to both main surfaces of a tape 44 made
of a polyethylene terephthalate film, a paper sheet or the like, and one adhesive surface is
adhered to the main surface of the base material 42.
[0027]
As described above, according to the present invention, it is extremely easy to incorporate a case
having a piezoelectric element into an electronic device and to connect the piezoelectric element
to a circuit very easily, and to replace the piezoelectric element in the event of a failure etc. An
easy piezoelectric acoustic device can be provided.
[0028]
Brief description of the drawings
[0029]
1 is an exploded longitudinal side view and an assembled longitudinal side view of a piezoelectric
acoustic device according to an embodiment of the present invention.
[0030]
2 is an exploded perspective view excluding the housing of the electronic device of the
piezoelectric acoustic device according to the same embodiment.
[0031]
3 is a plan view of a state in which the piezoelectric element is attached to the case of the
piezoelectric acoustic device according to the same embodiment.
[0032]
4 is an exploded perspective view of the main part excluding the housing of the electronic device
of the piezoelectric acoustic device according to the same embodiment.
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[0033]
5 is a plan view of an essential part of a state in which the piezoelectric element is attached to
the case of the piezoelectric acoustic device according to the same embodiment.
[0034]
<Figure 6> The principal part which shows the other example of the convex section of the
diaphragm of the piezo-electric acoustic device due to other execution example It is the plan
view.
[0035]
<Figure 7> The principal part which shows the other example of the electrode support section of
the case of the piezoelectric acoustic device due to the other execution example it is the top view.
[0036]
<Figure 8> It is the principal part disassembled perspective view which shows the other example
of the temporary fixing means of the block for connection to the projection of the diaphragm.
[0037]
<Figure 9> The principal part disassembled perspective view which shows the other example of
the temporary fixing means of the block for connection to the projection of the diaphragm.
[0038]
10 is an assembled longitudinal side view of a piezoelectric acoustic device according to another
embodiment of the present invention.
[0039]
11 is a cross-sectional view showing an example of the elastic member used in the piezoelectric
acoustic device according to the same embodiment.
[0040]
Explanation of sign
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11
[0041]
DESCRIPTION OF SYMBOLS 1 Case 2 Piezoelectric element 3 Protrusive part 12 of diaphragm
Vibrating block 13 Connecting block insulating part 15 Leading electrode 16 Connecting block
conductor part 21 Vibrating plate 22 Piezoelectric body 23 Piezoelectric electrode 36 Circuit
board 39 Circuit board Circuit pattern
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