Electronic wristwatch

Details Electronic wristwatch Electronic wristwatch

1978-07-28

1980-11-25

Miska, Vit W.

Horology: time measuring systems or devices

Chronological

With power monitor

368187, 368243, G04B 900, G04C 2300, G04C 900

Patent

active

042362377

ABSTRACT:
In an electronic wristwatch having a digital type of photo-electric display and powered by a battery, a battery life warning system is provided whereby the battery voltage is checked at periodic intervals and the photoelectric display is caused to flash on and off repetitively to indicate the approach of the end of the battery life. The timing of sampling pulses applied to a voltage detection circuit is controlled such that a temporary drop in battery voltage does not cause a display warning signal to be generated.

REFERENCES:
patent: 3898790 (1975-08-01), Takamune et al.
patent: 3911360 (1975-10-01), Kimzey
patent: 3949545 (1976-04-01), Chihara
patent: 4004407 (1977-01-01), Fujita
patent: 4028880 (1977-06-01), Ueda
patent: 4175377 (1979-11-01), Ichikawa

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