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JPS6190600

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DESCRIPTION JPS6190600
[0001]
B) Industrial field of application The present invention relates to a piezoelectric sounding device,
and as its application, alarm clock, calculator, game toy, melody card, vapor piano, microwave
oven, washing machine, alarm for bath, electronic jar, hair curler, Charger razor, sewing machine,
refrigerator, VTR, oil stove, fax machine, typewriter-1 copier, cash register, back buzzer, cover 1
? dispelling = pager, tone ringer, transceiver, gas leak alarm, theft It is used for alarm sound
generating devices, such as an alarm, a fire alarm, a pervert prevention device, a measuring
instrument, 5 automatic vending machines, and a bicycle. Mouth) Conventional technology The
piezoelectric sounding device changes the voltage state applied to a polarized piezoelectric
material such as ceramic, changes the shape of the piezoelectric element, and vibrates the
diaphragm coupled to the piezoelectric element to generate an oscillating sound. Output. Such a
piezoelectric sounding device is shown, for example, in Japanese Utility Model Application
Publication No. 59-10075. C) Problems to be solved by the invention In such a piezoelectric
sounding device, as shown in FIG. 5, it comprises a diaphragm (1) and a piezoelectric material M
(2i) formed on the surface of the diaphragm (1). The sound generating unit must be housed in
the case (5) with the sound generation part (3) and the circuit board / plate (4) for the oscillation
drive circuit applying a voltage to this piezoelectric material layer (2) stacked in two steps As the
size of the circuit board increases, the circuit board (4) and the sound emitting portion (3) must
be connected to each other, resulting in a problem that the manufacturing process becomes
complicated. E) Means for Solving the Problems The present invention provides a piezoelectric
material layer provided on the surface of a diaphragm, an fct pole pattern formed on the
piezoelectric material layer, and a piezoelectric material layer on the periphery of the electrode
pattern. The formed wiring pattern and the electronic component disposed according to the
wiring pattern and constituting the oscillation circuit are provided. E. Operation As described
above, since the oscillation circuit is provided on the piezoelectric material layer, the piezoelectric
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sounding device can be miniaturized. 1) Embodiment 1 FIG. 1 is a front view of a piezoelectric
speaker according to the present invention. In these figures, (6) is a brass-side diaphragm, (7) is a
large piezoelectric material layer provided on the surface of a grain diaphragm (6), and the
material is, for example, pb (Mg to N b 3 ( ) Ceramics formed by sintering the three components
of Oa-PdT1Oa-PbZr03, polyfluorinated vinylisene and the like are used. (8) is formed by printing
on the surface of the piezoelectric material N (6), and the fc electrode for voltage application rIL
pole, (9) is one of the voltage application electrode (8) in proximity to the voltage application
electrode (81). The feedback electrodes printed so as to surround the outer periphery of the
portion, (10; shout ... on the piezoelectric material M (7) on the outer periphery of these voltage
application electrodes [(81 and return electrodes (9) These electrodes +81 (91 and the wiring
(10) C1ot...) Are simultaneously formed by screen printing silver paste.
Furthermore, these wires (101 ? 01... Are connected to electronic parts such as transistor
elements and 121 (12 IQ 21 etc. for forming a self-oscillation circuit). Further, a part of such a
wiring head is connected to the diaphragm (6) through a through hole (not shown) formed in the
piezoelectric material layer (7) or an outer peripheral part of the piezoelectric material layer (7).
(The 13th shows the above-mentioned wire (a lead wire connected to lo + (1?... Is used to supply
power to the oscillation drive circuit consisting of the transistor (company) and the resistor
a2a7Ja2). That is, in this piezoelectric sounding device, the oscillation drive circuit as shown in
FIG. 2 is formed integrally with the piezoelectric diaphragm. Therefore, in such a piezoelectric
sounding device ? 4, since the oscillation drive circuit is provided at the outer peripheral portion
of the electrode pattern, the sounding state is not adversely affected, and the size and weight can
be reduced, as shown in FIG. Easily stored in case Cl5). 1fc, in such a piezoelectric sounding
device, a high voltage is applied to the voltage application electrode (8) formed on the
piezoelectric material layer (7) as shown in FIG. Apply these powers M (8) (91 and distribution!
Ia ? a ? иии After polarization of the piezoelectric material layer (7) in the pattern shape, it is
sufficient to just solder the transistor ?1), the resistor Q 2 + 021 (121), and there is no need for
troublesome wiring. Incidentally, although the feedback type piezoelectric sounding device is
shown in this embodiment, it is needless to say that the present invention can be practiced for a
device having no feedback electrode. As described above, according to the piezoelectric sounding
device of the present invention, the piezoelectric material layer provided on the surface of the
diaphragm, the electrode pattern on which the piezoelectric material layer is formed, and the
piezoelectric material layer on the periphery of the electrode pattern Since the wiring pattern
thus formed and the electronic components disposed according to the wiring pattern and
constituting the oscillation circuit are included, it is possible to reduce the weight of the cabin
without adversely affecting the sound generation state of the piezoelectric sounding device. In
addition, such a piezoelectric sounding device does not require a lead wire connecting the
oscillation drive circuit and the electrode, so the number of manufacturing steps is small and the
productivity is high.
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[0002]
Brief description of the drawings
[0003]
1 is a surface view of the piezoelectric sounding device of the present invention, FIG. 2 is a circuit
diagram of the piezoelectric sounding device of FIG. 1, FIG. 6 is a cross sectional view when the
piezoelectric sounding device of the present invention is fitted in a case, FIG. 4 is a front view
showing an electrode and a wiring pattern formed on a piezoelectric material layer, and FIG. 5 is
a cross-sectional view of a conventional piezoelectric sounding device housed in a case.
(6) ииииии Diaphragm, (7) иии и и и Piezoelectric material layer, +8) + 91 и и и и и и и и и и и (101 + lot и и и e
wiring, (? и и и иииии Transistor, p'batratr иииииии Resistance.
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