Electronic analogue timepiece of DC magnetic field detection typ

Details Electronic analogue timepiece of DC magnetic field detection typ Electronic analogue timepiece of DC magnetic field detection typ

1986-09-04

1987-08-25

Miska, Vit W.

Horology: time measuring systems or devices

Electrical time base

Solid state oscillating circuit type

318696, G04F 500, G05B 1940

Patent

active

046889485

ABSTRACT:
In an electronic analogue timepiece driven by a stepping motor, DC magnetic field detector is connected to the stepping motor to detect the presence of an external DC magnetic field by comparing two induced voltages induced across a motor coil due to free rotation of a motor rotor after each application of two successive drive pulses to the motor coil. A controller is connected to the DC magnetic field detector to control the stepping motor to effect compensation for the detected DC magnetic field.

REFERENCES:
patent: 4321521 (1982-03-01), Ueda et al.
patent: 4352172 (1982-09-01), Ueda et al.
patent: 4404510 (1983-09-01), Nakajima
patent: 4460282 (1984-07-01), Kanno
patent: 4533257 (1985-08-01), Kitano et al.

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