JPS595914Y2 - Piezoelectric buzzer with piezoelectric switch - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a piezoelectric buzzer with a piezoelectric switch, which has a switch function added to an element commonly used as an element for a piezoelectric buzzer.

Fig. 1A shows an element 3 in which a piezoelectric ceramic 1 having a split electrode used in the present invention and a metal plate 2 are glued together at its mouth; the surface of the piezoelectric ceramic 1 is divided into split electrodes 1a and 1b; 1a is for a piezoelectric buzzer, and the divided electrode 1b is for a piezoelectric switch.

FIG. 2 shows a block diagram of an example of a piezoelectric buzzer with a piezoelectric switch according to the present invention using the above-mentioned element 3, in which 4 is an amplifier circuit that amplifies the output of the piezoelectric switch side, 5 is a switching circuit, and 6 is a block diagram that uses element 3. This is a piezoelectric buzzer oscillation circuit that vibrates.

A specific circuit example of the circuit shown in Fig. 2 is shown in Fig. 3, and its function is that when the element as a piezoelectric switch is deflected by an external force, an electromotive force is generated by the piezoelectric phenomenon of the piezoelectric ceramic, and the amplifier circuit 4 MOS type field effect transistor 8
The signal is amplified by the thyristor 9 of the switching circuit 5.
is triggered to make it conductive, and the oscillation circuit 6 oscillates at the resonance frequency of the element as a piezoelectric buzzer to generate sound.

A switch 10 constituting the switching circuit 5 is used to stop sound generation.

FIG. 4 shows an example in which the circuits shown in FIGS. 2 and 3 are installed in the buzzer body 11.
is held with a cap 12, parts 14 constituting the above circuit are arranged on a printed circuit board 13, and the element 3 and a predetermined portion of the printed circuit board 13 are connected via lead wires 15.
It has a structure in which external connection is possible through an output terminal 16 and it is sealed with resin 17.

Here, in the above embodiment, the case where the amplifier circuit 4, the switching circuit 5, and the buzzer oscillation circuit 6 are provided in the buzzer body 11 has been described. Of course, the wiring may be connected outside the 11.

As described above, the present invention uses a piezoelectric buzzer element to provide the function of a piezoelectric switch.

[Brief explanation of drawings]

Figure 1A shows a top view and a front view of an element used in the piezoelectric buzzer with a piezoelectric switch according to the present invention, and Figure 2 is a block diagram showing an example of the piezoelectric buzzer with a piezoelectric switch of the present invention using the same element 1. 3 are wiring diagrams showing a specific example of the circuit shown in FIG. 2, and FIG. 4 is a schematic sectional view showing the structure of the piezoelectric buzzer with a piezoelectric switch in FIGS. 2 and 3. 1...Piezoelectric ceramic, la, lb...divided electrode, 2...metal plate, 3...element, 4...interval amplifier circuit, 5... ... Switching circuit, 6 ... Piezoelectric buzzer oscillation circuit, 11 ...
... Buzzer body, 16... Song output terminal.

Claims (2)

[Scope of utility model registration request] (1) The surface of the piezoelectric ceramic of an element in which a piezoelectric ceramic and a metal plate are bonded is used as a divided electrode, one divided electrode is used for a piezoelectric buzzer, the other divided electrode is used for a piezoelectric switch, and the output terminal is connected to the buzzer body. A piezoelectric buzzer with a piezoelectric switch that leads to the outside. (2) A piezoelectric buzzer with a piezoelectric switch as set forth in claim 1, which is a utility model, and comprises an amplifier circuit for amplifying the output on the piezoelectric switch side, a switching circuit, and a piezoelectric buzzer oscillation circuit in one buzzer body.