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JPS556970

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DESCRIPTION JPS556970
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a continuous sound oscillation circuit diagram.
FIG. 2 is an intermittent noise oscillation circuit diagram. FIG. 3 is a front view of the metal
diaphragm and the piezoelectric element of the present invention. FIG. 4 is a perspective view of
the metal diaphragm and the piezoelectric element in the same manner. O · · · · · Metal
diaphragm, X, Y · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
collector load resistor, R2 · · · · · · bias resistor, R3 · · · ... A resistor for intermittent oscillation.
[Detailed description of the invention] There are various types of signal sound generators that
drive an imaging plate by electric current to generate sound waves and store them, but the
oscillation mechanism is small to be necessary to be incorporated into equipment It is natural
that what can fit in space is desired. In this case, it is the existence of a coil that hinders the
progress of downsizing and thinning. This invention. Is a system (1) that can realize a thin
oscillation mechanism and obtain many effects associated with it by using a signal sound
generator which does not use a coil. As shown in the drawings, in the present invention, a
piezoelectric element X of barium titanate, rossel salt, etc. is attached to one side of a metal
vibration tmo, and a similar piezoelectric element Y is attached to the other side to make a metal
diaphragm 0. Connect the piezoelectric element X to the collector of the transistor T, connect the
collector to the DC power supply B through the load resistor R1, connect the piezoelectric
element Y to the base of the transistor T 1 °, and connect the base to the ground It is a tone
generator having a structure in which a resistor for oscillation R3 and a capacitor C are
connected at intervals. When an alternating voltage is applied to the piezoelectric element X, the
metal diaphragm O is expanded and contracted to vibrate the metal diaphragm O. However, an
alternating voltage is generated in the piezoelectric element Y due to the vibration of the metal
diaphragm 0. The voltage generated in the piezoelectric element Y is increased by 'Vip' by the
amplification circuit, and the amplified alternating voltage is fed back to the piezoelectric element
X to vibrate the metal diaphragm O. 1 shows a continuous sound oscillation circuit, but FIG. As
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shown, connecting the piezoelectric element Y to the base (2) of the transistor T and connecting
the oscillating resistor R3 and the capacitor C between the base and the ground connects the
oscillating resistor R3 and the capacitor C. Intermittent oscillation (such as B and P) is caused by
the time constant of According to the above-mentioned structure, various audible oscillations are
possible, and not only can be used as various notification sounds, but also since a coil is not used
on the circuit, it is possible to produce an extremely thin project P 桐 as a turn. In addition to the
effect of reducing the cost, the effect of reducing the occurrence of failure can be obtained.
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