Electronic watch

Details Electronic watch Electronic watch

1978-07-24

1980-12-23

Miska, Vit W.

Horology: time measuring systems or devices

Chronological

With mechanical or electromechanical driven display

368 85, 368217, 318696, G04B 1900, G04C 1900, G04C 300

Patent

active

042414334

ABSTRACT:
In an electronic watch a non-operation detecting circuit detects the non-operative condition of the stepping motor of the watch and produces a non-operation signal each time the stepping motor fails to operate in response to the standard pulse which drives the same. A counter counts the number of non-operation signals and stores the count for later use. A rotation detecting circuit detects the resumption of operation of the stepping motor in response to the standard pulse from the non-operative condition and a quick feed control circuit quickly advances the stepping motor in response to an input from the rotation detection circuit by thereafter supplying, instead of the standard pulses, the quick feed pulses to the drive circuit for the motor equal in number to the number of the non-operation signals counted in the counter. In this way the corrected time will be displayed by the watch even after being rendered inoperative as a result of an external condition such as low temperature or a high strength DC magnetic field.

REFERENCES:
patent: 3812670 (1974-05-01), Nikaido et al.
patent: 4129981 (1978-12-01), Nomura et al.
patent: 4150536 (1979-04-01), Nakajima et al.
patent: 7032827 (1977-06-01), Dobratz et al.

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