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JPS50133073

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DESCRIPTION JPS50133073
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a composite in which a piezoelectric
element provided with divided electrodes and a metal plate are integrated. FIG. 2 shows an
example of a circuit of a conventional piezoelectric acoustic device. FIG. 3 shows the relationship
between the resonance impedance of the piezoelectric composite and the output sound volume
of the piezoelectric acoustic device in the conventional circuit and the circuit according to the
present invention. FIG. 4 shows an embodiment of the circuit according to the present invention.
[Indicates a metal plate, 2 a piezoelectric element, 3 a silver electrode, 4 an adhesive, 5 a bow a
lead wire, 6 a spark, 8 a split electrode, 9 and 10 a piezoelectric composite, R0 R6 is a resistor,
C2 CC2 is a capacitor, Tr1, 'r, is a transistor. 2) + 1 167-50-133 073 (2) 3 梳 艮 ダ ン ス ダ ン ス
ダ ン ス ダ ン ス 図 49.10. Correction 昭 49.10. 18
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piezoelectric
acoustic device used for a general-purpose buzzer and bell used in fire alarms, alarm buzzers
such as crime prevention bells, call buzzers such as telephones and meters. As shown in FIG. 1,
the piezoelectric speaker has an adhesive of delconic acid, lead titanate-based 1-piezoelectric
element (2) and metal plate (1) with silver electrodes fa) (g ') attached on the front and back. The
silver electrode (3) and the metal plate 【The lead wire f5 (s') is soldered to the silver electrode
(3) and the metal plate [9] to electrically connect it to the oscillator (6). The complex is bent and
vibrated at its natural bending vibration frequency as indicated by a broken line (7) (7'1) to
generate an audible sound. Conventionally, as shown in FIG. 2, this type of piezoelectric buzzer is
combined with a transistor and a resistor and a capacitor to form an oscillation 1 circuit to
generate an audible sound, which has long been known, 16 completions. 1カ、い。 How is it?
When the resonance impedance of the piezoelectric vibrator becomes large due to the supporting
method of the work movement and the surrounding environment such as temperature, the
output volume becomes extremely small as shown by the solid line in FIG. 3 and oscillation stops.
. ’**G)l! mf14f@41mkMイ? aEAfb。 The electric signal generated by the
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piezoelectric effect by the imaging movement of the piezoelectric imaging element from the
divided electrodes (8) of the piezoelectric vibrator shown in FIG. 11 is considered from one
transistor (Trg) and two resistances (Rs) (Re) birr> @ 85 °) 27 points 72 °-ー, fee 4. . 9. The
circuit is automatically oscillated to vibrate the piezoelectric image pickup element 2 to generate
all audible sound. According to the circuit of the present invention, as shown by the broken line
in FIG. 8, even if the resonance impedance of the piezoelectric vibrator becomes large, the
oscillation does not completely stop. According to the circuit of the present invention, since the
number of parts is small without using a capacitor, the size and weight of the piezoelectric
acoustic device can be reduced. Eight pieces are sufficient for the conventional one for six circuit
parts. A "When driving a piezoelectric actuator having a different shape in the same circuit, the
circuit constant must be changed according to the conventional circuit as shown in FIG. 2, but
according to the circuit of the present invention, this is not necessary. The other resistor may be
connected in series to the collector, emitter or base of the transistor. The transistor is not limited
to the npn type.
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