Electronic timepiece

Horology: time measuring systems or devices – Regulating means – For compensation

Patent

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Details

368155, G04C 300

Patent

active

042043972

ABSTRACT:
An electronic timepiece reduces power consumption by normally driving the stepping motor with a short pulse and driving the motor with a wide pulse under heavy load conditions by sensing the rotor position. A detection circuit senses the voltage drop across a detection element in series with the motor coil for driving a first detection pulse and senses again for driving a second detection pulse. If the second voltage drop is larger, then the rotor is not rotating whereupon the wide pulse is used to drive the motor.

REFERENCES:
patent: 4150536 (1979-04-01), Nakajima

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