Sound producing device for watches

Details Sound producing device for watches Sound producing device for watches

1980-06-24

1982-05-18

Miska, Vit W.

Horology: time measuring systems or devices

Signalling means

Time condition responsive

G04C 216

Patent

active

043308783

ABSTRACT:
A sound producing device for watches comprising an electromagnetic exciting means having a coil and a permanent magnet, and first and second vibration plates disposed on opposite sides of the electromagnetic exciting means. The natural frequencies of both vibration plates are different from each other. The first vibration plate is vibrated by magnetic force and the vibration of the plate causes the resonant vibration of the second vibration plate.

REFERENCES:
patent: 4167849 (1979-09-01), Takahashi
patent: 4258432 (1981-03-01), Zafferri et al.

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