Adjustable piezoelectric transducer for a watch

Details Adjustable piezoelectric transducer for a watch Adjustable piezoelectric transducer for a watch

1979-09-28

1980-11-11

Jackmon, Edith S.

Horology: time measuring systems or devices

Chronological

With simultaneous time indicating means

368245, 368276, 340384E, G04B 2110, G04C 2138, G08B 300

Patent

active

042336791

ABSTRACT:
A watch includes a piezoelectric wafer mounted on a membrane held by its peripheral edge inside a watch caseback. A frequency adjustment device mounted in the caseback includes a rotatable arm contacting the membrane and movable to adjust the resonant frequency of the membrane and piezoelectric crystal vibrating assembly. The frequency of the piezoelectric transducer may be adjusted to match a desired frequency of an electrical or sound signal.

REFERENCES:
patent: 4068461 (1978-01-01), Fassett et al.

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