JPS5897593U

JPS5897593U - Drive circuit for piezoelectric buzzer for electronic wristwatch

Info

Publication number: JPS5897593U
Application number: JP19805681U
Authority: JP
Inventors: 修輿石
Original assignee: Seiko Epson Corp
Current assignee: Seiko Epson Corp
Priority date: 1981-12-24
Filing date: 1981-12-24
Publication date: 1983-07-02

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図：昇圧駆動回路、第２図：昇圧駆動回路″　にお
けるトランジスタベース電圧波形（２−Ｉ）、昇圧用コ
イルに流れ込む電流波形（２−ＩＩ）、圧電素子間の電
圧波形（２−ＩＩＩ）、第３図：プッシュプル駆動回路
、第４図：第３図において圧電ブザー８点側の電圧波形
（４−■、電源■側をグラ゛　ンド）、ｂ点側の電圧波
形（４−■、電源■側をグランド）、圧電ブザー両極間
（ａ、　　ｌ）間）の電圧波形（４−１１１）、第５Ｎ
：本考案の一実施例、第６図：第５図の駆動回路におけ
る圧電ブザ、−両極間（ａ、　　ｂ間）の電圧波形、第
７Ｎ：本考案の別の実施例。ここに、１・・・・・・昇圧用コイル、２・・・・・・
定電ブザー、３・・・・・・ＮＰＮ　トランジスタ、４
・・・・・・Ｐチャン、５・・・・・・Ｐチャン、６・
・・・・・Ｎチャン、７・・・・・・Ｎチャン、８・・
・・・・インバーター、９・・開駆動回路内を流れる電
流、１０・・・・・・駆動回路内を流れる電流、１１・
・・・・・電池電源。Ｊ、５　　図　　−Figure 1: Boost drive circuit Figure 2: Boost drive circuit Transistor base voltage waveform (2-I), current waveform flowing into the boost coil (2-II), voltage waveform between piezoelectric elements (2-III) ), Figure 3: Push-pull drive circuit, Figure 4: In Figure 3, the voltage waveform on the 8-point side of the piezoelectric buzzer (4-■, the power supply ■ side is grounded), the voltage waveform on the b-point side (4- ■, power supply ■ side is ground), voltage waveform (4-111) between piezoelectric buzzer poles (a, l), 5th N
: One embodiment of the present invention, FIG. 6: Piezoelectric buzzer in the drive circuit of FIG. 5, voltage waveform between two poles (a, b), 7th N: Another embodiment of the present invention. Here, 1...boosting coil, 2...
Constant voltage buzzer, 3...NPN transistor, 4
...P-chan, 5...P-chan, 6.
...N-chan, 7...N-chan, 8...
...Inverter, 9. Current flowing in the open drive circuit, 10... Current flowing in the drive circuit, 11.
...Battery power supply. J, 5 Figure -

Claims

[Scope of utility model registration request]

In a drive circuit that connects the outputs of inverters A and B with a complementary structure to a piezoelectric buzzer and drives the piezoelectric buzzer in push-pull mode, when the buzzer is not in a driving state, both inverters A and B are connected to P channel or N channel. A drive circuit for a piezoelectric buzzer for an electronic wristwatch, characterized in that a channel is made conductive to equalize the potential between the two electrodes of the piezoelectric buzzer.