JPS5492180

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DESCRIPTION JPS5492180
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of an embodiment of an
electronic buzzer used in a conventional electronic watch, FIG. 2 is a sectional view of a unitized
electronic buzzer according to the prior art, and FIG. FIG. 4 is a plan view of a diaphragm
according to the present invention. 3 · · · Piezoelectric element, 3a, 3b · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · insulating flat plate, 8a, 8b, 8c. 8d ······ Conductive pattern.
DETAILED DESCRIPTION OF THE INVENTION The present invention uses a piezoelectric element
to make a t-electronic buzzer 1- / 1: L- / '. Conventionally, as a t-child buzzer using a piezoelectric
element for use in an electronic wrist watch etc., as shown in FIG. 1, the piezoelectric element 3 is
attached to the back pig 1 so as to be conductive with the electrode 3. It has been considered to
electrically connect the second electrode 3b to the pattern 7 'formed on the substrate 7 by using
the spring 6. However, the shape of the back pig 1 is complicated and it is difficult to accurately
make it precisely, and the surrounding O support is unstable, so it was difficult to make the one
with the same resonance frequency as wR working plate 4 . Therefore, in order to unify the
sound pressure level, it is necessary to capture the vibration or the plate 4 at a constant
frequency shifted from the resonance same wave number, and to obtain a low input and high
output sound pressure. It was difficult. 1+ Because the entire back pig was a diaphragm, it was
not possible to charge / detach the battery removal lid on the exterior. Therefore, the small
unitized 化 9 shown in Fig. 2 is covered and friends. The piezoelectric element 3t-1 菖 IQ: The J
electrode 3υ and the metal plate 2 are electrically connected to the metal plate 2 so that the
diaphragm 4 is formed as a whole. The diaphragm 4 is bonded to the diaphragm frame 9 so that
the periphery is supported in the same city. In the case of a small electronic buzzer having a
diameter of 10 mm or less of the diaphragm, the thickness of the metal plate becomes very thin
as O61 * or less in order to resonate at several KHz generally used in the electronic buzzer. As
described above, if the spring directly conducts the second electrode 36, the resonance
frequency and the sound pressure are affected. Therefore, the insulating substrate 10 is bonded
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to the diaphragm frame 14, and conduction is made between the second electrode 3b and the
pattern IOG on the insulating substrate 10 using the lead @ 11. In this pattern 10cL, the buzzer
output terminal of one circuit board 7 And the lead plate 5 are connected. However, in this
configuration, the number of parts is large, many manual operations such as soldering and
bonding are difficult to mass-produce, and the thickness does not become thin. Furthermore,
when trying to reduce the diameter of the diaphragm, the thickness of the metal plate is further
Kll < It had to be L, and it had the disadvantage that Karoe, handling became solid. The present
invention is intended to provide a small, thin, unitized electronic buzzer with a small number of
components, eliminating manual processes, and providing a unitized electronic buzzer, except for
the drawbacks as described above. Ru. The present invention will be described in detail below
with reference to FIG. In FIG. 3, reference numeral 8 denotes an insulating flat plate, and
conductive patterns 8α, 8j +, 8C, 8d are formed as shown in FIG.
The pattern 84B has the same shape as the piezoelectric element 3 at approximately the center
of the insulating flat plate 8, and is further connected to the contact pattern 8c on the outer
peripheral portion. The pattern 8b is provided at a position tK not in contact with the electrode
3a of the piezoelectric element 3 and is connected to the contact pattern 8d on the outer
peripheral portion. The piezoelectric element 3 is attached to the insulating flat plate 9 so that
the IE pole 3α can be electrically connected to the pattern 8G, and constitutes the diaphragm 4
as a whole. The other electrode 3b and the pattern 8h are electrically connected by wire bonding,
lead IMCL, soldering or the like. The diaphragm 4 is fixed and supported by bringing the outer
term into contact with the diaphragm frame 9. How to take the lead of the unitized electronic
buzzer having the above-mentioned O-shaped dipping is as described in (b) M group in the
patterns 8c and 84 for contact with the outer fixed support of the front re-vibration plate 40:
Conduction is taken by a lead plate 5 ° 13 placed on the market by screwing etc. As the
insulating flat f 8, it is conceivable to use a polycarbonate 7 etc. tree 7 @, etc., and since the
elastic engagement is about 30 to 70 times smaller than metal, in order to obtain the same
resonance frequency, the diameter If it is the same, the thickness of the vibrating plate will be
about 3 to 4 times. As described above, by using the diaphragm in which the piezoelectric
element is in contact with the insulating flat plate, even if the diameter of the diaphragm is
reduced, the thickness is thicker than in the case of using the metal plate. Is easy to handle.
Further, by providing a flat pattern electrically connected to the two electrodes of the
piezoelectric element on the insulating flat plate, it is possible to obtain a thin unitized electronic
buzzer having a small number of parts. Furthermore, since the external lead plate is in contact
with the solid support portion of the diaphragm, K has many effects such as very little influence
on the resonance frequency and the sound pressure.
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