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JPS5446281

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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS5446281
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 are cross-sectional views of a
piezoelectric buzzer vibrator showing different embodiments of the present invention, and FIG. 3
shows an application example of the embodiment of FIG. It is a sectional view of a vibrator. 1.4 · ·
· diaphragm, 2, 5 · · · piezoelectric element, 3. γ: flexible printed board, 2a, 2b, 5a, sb: electrode
of piezoelectric element, 3a, ra: conductive pattern portion.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of an
electronic buzzer using a piezoelectric element. --- 11-In recent years, the number of devices
using ICs has increased, and electronic buzzers have often been used to confirm the operation
and to notify the end of operation. There are various applications for the purpose of confirming
the following, for generating the ringing tone of a pager, and for generating the alarm sound of
an electronic watch with an alarm function. On the other hand, a piezoelectric buzzer is used in
which a combination of a piezoelectric element and a vibration plate 7 is used as a vibrator. In
this piezoelectric bushing, as a method of electrically connecting the two electrodes of the
piezoelectric element and the drive circuit, one of the electrodes of the piezoelectric element is
usually taken out from the peripheral support portion of the diaphragm or the vicinity thereof via
the diaphragm. There is no adverse effect on the electro-acoustic conversion efficiency etc. of the
vibrator, but the electrode on the opposite side of the other diaphragm directly presses the
connection spring to the electrode surface of the piezoelectric element or drives it to the
electrode surface Electrical connection is made by attaching a lead wire from the circuit with an
attachment or the like, and when the former is connected to the electrode surface of the
piezoelectric element by pressure, the contact pressure is vibrated. The vibration of the child can
be prevented, and in the latter case, attachment and detachment of the vibrator and the drive
circuit become troublesome. In this invention, in the vicinity of the peripheral support portion of
the diaphragm, the electrode on the opposite side of the diaphragm of the piezoelectric element
is guided to the peripheral support portion of the diaphragm while maintaining insulation with
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the diaphragm using a flexible print board. It makes it possible to make an electrical connection
between the two electrodes of the piezoelectric element and the drive circuit, and thus make it
possible to make a detachable electrical connection using a connection spring with almost no
prevention of the vibration of the oscillator It is. In the following, referring to the drawings, FIG. 1
shows one of the embodiments of the present invention, and is a cross-sectional view of a
vibrator of a piezoelectric fuser, in which 1 is a metal diaphragm, A piezoelectric element 2 is
integrated with the diaphragm 1 by adhesion, and one electrode 2a of the piezoelectric element 2
is in contact with the diaphragm 1, and electrical connection between the diaphragm 1 and one
electrode 2a of the piezoelectric element 2 is performed. ing. Further, 6 is a flexible pull-printed
board, and the insulating sheet portion is adhered and fixed to the diaphragm 1 and the
piezoelectric element 2, and the electrode 2 a of the piezoelectric element 2 opposite to the
diaphragm 1 and the flexible print The conductive pattern portion 6a of the board 3 is
electrically connected by soldering through the hole 3b of the flexible printed board 6, and is
conducted to the peripheral portion 1a of the diaphragm 10 by the conductive pattern 6a.
Therefore, the two electrodes 2a and 2b of the piezoelectric element 2 can be taken out to the
peripheral portion 1a of the imaging / plate 1 by the conductive plate portion 3a of the
diaphragm 1 and the flexible printed board 6, respectively. By bonding the insulating sheet
portion of the flexible printed board 6 to the diaphragm 1 over the entire circumference of the
piezoelectric element 2, the piezoelectric element 2 can be sealed to provide a moisture-proof
and waterproof effect. Next, FIG. 2 shows another embodiment of the present invention, and is a
cross-sectional view of a vibrator of a piezoelectric buzzer as in FIG. 1. 4 is a diaphragm made of
metal, 5 is a diaphragm 4 The one electrode 5a is in contact with the diaphragm 4 and is
electrically connected to the diaphragm 4 and the one electrode 5a of the piezoelectric element
5. 6 is an insulating tool bonded and fixed to the diaphragm 4 and 7 is a flexible 4-pull printed
board. The conductive pattern portion 7a is bonded and fixed to the electrode 5b of the
piezoelectric element 5 to make electrical connection with the electrode 5b. It is led to the
peripheral portion 4a of the diaphragm 4 by the conductive pattern portion 7a, and the hole 7b
of the insulating sheet portion of the flexible printed board 7 is electrically connected to the drive
circuit. Therefore, the two electrodes 5a and 5b of the piezoelectric element 5 are taken out to
the peripheral portion 4a of the diaphragm 40 by the diaphragm 4 and the conductive pattern
portion 7a of the flexible printed board 7, respectively. In the holes 7b of the insulating sheet
portion of the printed circuit board 7, electrical connection can be made with a metal contact
spring or conductive rubber from the drive circuit. In addition, a conductive pattern portion (not
shown) independent of 7a is provided on the flexible printed board 7, and the conductive pattern
portion is adhered and fixed to the diaphragm 4 to perform an electrical fluid a with the
diaphragm 4 to achieve flexibility. It is also possible to elongate a part of the printed board 7 and
lead the conductive pattern portion 7a and the hole 7b to the extended portion so as to make an
electrical connection with the drive circuit at the tip portion of the extended portion. Next, FIG. 3
shows an application example of the embodiment of FIG. 2. In the embodiment of FIG. 2, the
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outer shape of the insulating sheet 6 bonded and fixed to the diaphragm 4 is also thicker than
the outer shape of the diaphragm 4, The whole vibrator is elastically supported by fixing the
portion 6b 'outside the outer shape of the diaphragm 4 of the insulating sheet 6', and the
resonance frequency of the vibrator is compared with the case where the periphery of the
diaphragm 4 is directly fixed. Can be lowered. The same applies to the case where the outer
shape of the flexible printed board 7 is enlarged to the insulating sheet 60s 7. As described
above, according to the present invention, by using the flexible / pull printed board to guide the
electrodes of the piezoelectric element to the peripheral portion of the diaphragm, the vibrator
and the drive circuit can be detachably attached without adversely affecting the vibration of the
vibrator. It is possible to use both the moisture and water resistance of the piezoelectric element
by sealing the piezoelectric element between it and the diaphragm by means of the flexible
printed circuit board. A flexible / pull printed board can also be used as a means of improving the
method of supporting the vibrator as in the embodiment of FIG.
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