Watch with electronic buzzer

Details Watch with electronic buzzer Watch with electronic buzzer

1977-11-17

1979-09-18

Weldon, Ulysses

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

58 90R, 340384E, G04B 2312

Patent

active

041678494

ABSTRACT:
A waterproof acoustic vibrator for a timepiece and comprising a waterproof housing and a plate-like member having a magnetic portion. The plate-like member is mounted for oscillation opposite the waterproof housing and is maintained in a rest position by first magnetic biasing structure. Second magnetic biasing structure magnetically biases the plate-like member to oscillate and develop audible acoustic waves. The first magnetic biasing structure is a permanent magnet, and the second magnetic biasing structure is an electromagnet disposed within the waterproof housing.

REFERENCES:
patent: 3577876 (1971-05-01), Spadini
patent: 3858389 (1975-01-01), Isuruishi
patent: 3863437 (1975-02-01), Barth et al.

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