Electronic watch

Details Electronic watch Electronic watch

1989-04-17

1990-03-20

Roskoski, Bernard

Horology: time measuring systems or devices

Electrical time base

368168, 368157, 368149, 368187, G04C 1500, G04C 900

Patent

active

049107216

ABSTRACT:
A timepiece includes a hairspring for storing the energy provided by a step motor driving circuit and a rotor immersed in a viscous fluid controls the energy released by the hairspring to provide a constant driving force for turning the display hands of the timepiece. A frequency divider circuit counts the number of clock signals produced by an oscillator. During time correction when the hands are prevented from being driven by the energy stored in the hairspring the frequency divider retains at least a portion of the count. A recoil torque provided by the hairspring and a load torque provided by the rotor are substantially balanced at all times including immediately after the time correction activities. Time delay especially immediately following the time correction activities is avoided.

REFERENCES:
patent: 3961213 (1976-06-01), Koike et al.
patent: 3978654 (1976-09-01), Koike et al.

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