Wristwatch with piezoelectric buzzer

Details Wristwatch with piezoelectric buzzer Wristwatch with piezoelectric buzzer

1983-10-27

1984-07-10

Roskoski, Bernard

Horology: time measuring systems or devices

Signalling means

Time condition responsive

368 72, G04C 2100

Patent

active

044590377

ABSTRACT:
A wristwatch having a piezoelectric buzzer therein includes a watch case and a case back. The piezoelectric buzzer includes a piezoelectric element mounted on the case back inside the watch case. A driver selectively applies signals having a frequency of about 4 kHz to the buzzer. The case back, acting as the vibration plate for the piezoelectric element, is constructed so that the resonance frequency thereof is between 5.5 kHz and 7 kHz.

REFERENCES:
patent: 3788060 (1974-01-01), Kawamura
patent: 3940919 (1976-03-01), Yasuda et al.
patent: 3943388 (1976-03-01), Massa

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