Magnetic field detection device for electronic timepiece

Details Magnetic field detection device for electronic timepiece Magnetic field detection device for electronic timepiece

1979-04-25

1982-03-23

Truhe, J. V.

Electricity: motive power systems

Open-loop stepping motor control systems

318647, 368 10, 368 11, G05B 1940

Patent

active

043215190

ABSTRACT:
An electronic timepiece of the type having a frequency dividing circuit, and a drive circuit for driving a motor having a rotor, a stator and a driving coil, is provided with a magnetic field detection device comprised of a low impedance closed loop including a low resistance element and the driving coil and a high impedance closed loop including a high resistance element and the driving coil. The driving coil develops an induced voltage when placed in an external alternating magnetic field and also functions to drive the rotor. The strength of the alternating magnetic field is measured by the voltage level developed across the high resistance element and the measuring sensitivity is improved by alternately switching between the low impedance closed loop and the high impedance closed loop. In response to the detection output of the magnetic field detection device, the effective power applied to the driving coil is increased so that the motor performance is not adversely affected by the external alternating magnetic field.

REFERENCES:
patent: 3756010 (1973-09-01), Kimura et al.
patent: 4158287 (1979-06-01), Nakajima et al.

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