Electronic watch with touch-sensitive keys

Details Electronic watch with touch-sensitive keys Electronic watch with touch-sensitive keys

1979-04-04

1981-03-17

Truhe, J. V.

Horology: time measuring systems or devices

Chronological

With manually actuated display

368185, 368321, 307116, 340365C, 200DIG1, G04C 1700, G04C 1900, G04C 2100, G04B 1712

Patent

active

042571170

ABSTRACT:
Touch sensitive key switches of an electronic watch which control functions of the watch such as time setting, are gated to reduce the power consumption of the watch. The key switches are capacitive and are fed signals derived from the time standard oscillator of the watch. A change in the key switch signals when the switches are touched by the user activate the time setting functions. Gates are provided coupling the signals derived from the oscillator to the key switches so that the signals are applied to the key switches either under control of the user or during repetitive time periods, reducing the time the signals are applied to the key switches and the power necessary to continuously supply such signals to the key switches.

REFERENCES:
patent: 3810356 (1974-05-01), Fujita
patent: 3983690 (1976-10-01), McClintock
patent: 4047010 (1977-09-01), Perotto et al.
patent: 4063111 (1977-12-01), Dobler et al.
patent: 4091610 (1978-05-01), Sasaki et al.

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