Electronic watch

Details Electronic watch Electronic watch

1978-04-20

1982-01-19

Miska, Vit W.

Horology: time measuring systems or devices

Chronological

With power monitor

368 80, 368 85, 368160, G04B 900, G04B 1904, G04F 500

Patent

active

043120580

ABSTRACT:
In an electronic watch having a stepping motor, a battery voltage detecting circuit, a rotation detecting circuit for indicating rotation or non-rotation of the stepping motor and a motor driving power control circuit for applying a higher power drive pulse to the motor than a normal drive pulse upon detection of non-rotation, the operation of the rotation detecting circuit is inhibited upon indication of a low battery voltage condition and the motor is driven continuously with the higher power drive pulses for the extent of the battery low voltage condition. In this way, the electronic watch can be operated stably when the battery is at the end of its life and operated with lower power consumption during the time when the battery is operated at full voltage.

REFERENCES:
patent: 4028880 (1977-06-01), Veda
patent: 4114364 (1978-09-01), Takahishi
patent: 4129981 (1978-12-01), Nomoru et al.

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