Analog electric timepiece

Details Analog electric timepiece Analog electric timepiece

1983-12-15

1985-08-06

Roskoski, Bernard

Horology: time measuring systems or devices

Regulating means

For compensation

368157, 368160, G04B 1720

Patent

active

045332576

ABSTRACT:
Circuits are provided for avoiding misdetection of a non-rotated condition after driving the timepiece stepping motor. Voltages induced in the rotor coil by external high frequency magnetic fields, and current produced in the coil by lower frequency AC magnetic fields are detected. When a high frequency or AC magnetic field of sufficient intensity to cause a false indication of motor rotation is detected, the motor is next driven with a pulse having greater width than the normal driving pulse so as to assure operation of the motor. A period is provided, before the normal driving pulse would be applied, to detect AC magnetic fields and a period preceding the period for detection of AC magnetic fields is provided for detection of high frequency magnetic fields. A comparator or inverter is used to determine whether the levels of external magnetic fields are sufficient to cause misdetection of rotor position.

REFERENCES:
patent: 4321519 (1982-03-01), Ueda et al.
patent: 4321520 (1982-03-01), Ueda et al.
patent: 4321521 (1982-03-01), Ueda et al.
patent: 4352172 (1982-09-01), Ueda et al.

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