Piezoelectric buzzer for wrist watches

Details Piezoelectric buzzer for wrist watches Piezoelectric buzzer for wrist watches

1983-05-27

1985-07-02

Miska, Vit W.

Horology: time measuring systems or devices

Signalling means

Time condition responsive

368255, G04C 2116

Patent

active

045264775

ABSTRACT:
A piezoelectric buzzer directly secured to a portion of a wrist watch casing and driven to vibrate the casing and produce an alarm sound. Associated circuitry alternately drives the piezoelectric buzzer at two different frequencies having a frequency ratio of 4:5 and at monotonically decreasing amplitudes as to produce alarm sounds like chimes.

REFERENCES:
patent: 3733804 (1973-05-01), Diersbock
patent: 3759029 (1973-09-01), Komaki
patent: 4060973 (1977-12-01), Martino
patent: 4104865 (1978-08-01), Sasaki
patent: 4203278 (1980-05-01), Kondo et al.
patent: 4205517 (1980-06-01), Murakami et al.
patent: 4234944 (1980-11-01), Komaki et al.
patent: 4370067 (1983-01-01), Iwakura

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