Illumination device for electronic timepiece

Details Illumination device for electronic timepiece Illumination device for electronic timepiece

1977-07-27

1980-06-24

Truhe, J. V.

Horology: time measuring systems or devices

Chronological

With electro-optical display

350150, 368 79, 368 67, G04B 1930

Patent

active

042088690

ABSTRACT:
An illumination device for an electronic timepiece equipped with an electro-optical display device and a battery as a power source, which comprises: an electro-luminescent sheet disposed at the lower surface of said electro-optical display device; a booster circuit for converting the battery voltage to an AC voltage; and an illumination switch for operating said booster circuit in response to the manipulation of an external control member; whereby said electro-optical display means is illuminated when said electro-luminescent sheet is rendered light emissive in response to manipulation of said illumination switch.

REFERENCES:
patent: 3828547 (1974-08-01), Fujita
patent: 3864905 (1975-02-01), Richardson

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