Electronic watch control device for manual actuation

Details Electronic watch control device for manual actuation Electronic watch control device for manual actuation

1977-11-02

1980-10-14

Miska, Vit W.

Horology: time measuring systems or devices

Displays or display device details

With manual activation

368239, 307116, 307130, G04B 1900, G04C 1700, H01H 3500, H01H 4700

Patent

active

042285348

ABSTRACT:
An electronic watch control device for manual actuation is disclosed. It comprises a capacitive sensor including a conductive layer on the inner surface of the watch-glass, which is actuated by placing a finger-tip on the outer side of the watch-glass. The sensor is part of a capacitive voltage divider to which a high frequency voltage is applied. Synchroneous detection means are arranged for detecting the high-frequency voltage drop across the sensor in synchronism with the high-frequency. Comparison means are provided for comparing the value of the said voltage drop to a reference voltage and producing a control signal depending on the condition of the sensor.

REFERENCES:
patent: 3497995 (1970-03-01), Forsberg
patent: 3749984 (1973-07-01), Benton, Jr. et al.
patent: 3750126 (1973-07-01), Solomon
patent: 3784848 (1974-01-01), Hamilton
patent: 3829850 (1974-08-01), Guetersloh
patent: 3927336 (1975-12-01), Carlson et al.
patent: 3956743 (1976-05-01), Geiszler et al.
patent: 4047010 (1977-09-01), Perotto et al.
patent: 4055755 (1977-10-01), Makamura et al.

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