Electronic timepiece

Details Electronic timepiece Electronic timepiece

1976-07-01

1978-04-25

Jackmon, Edith S.

Electricity: motive power systems

Motor-reversing

Armature or primary circuit control

318311, 318318, 318432, G04C 300, G05B 501

Patent

active

040855775

ABSTRACT:
An electronic timepiece is driven by a pulse motor and includes a pulse motor driving circuit which applies frequency-divided pulses for maintaining the rotational inertia of a rotor. The revolutions of the pulse motor are detected as is the load on the motor. In addition, the revolutions of the pulse motor are periodically compared with the number of driving pulse. A second hand of the electronic timepiece is continuously rotated by the pulse motor.

REFERENCES:
patent: 3110853 (1963-11-01), Jones
patent: 3546553 (1970-12-01), Loyd
patent: 3756014 (1973-09-01), Zatsky et al.
patent: 3855781 (1974-12-01), Chihara et al.

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