Electronic watch

Details Electronic watch Electronic watch

1977-12-07

1980-05-27

Rubinson, Gene Z.

Electricity: motive power systems

Open-loop stepping motor control systems

368162, H02P 122

Patent

active

042052629

ABSTRACT:
An electronic watch comprising a rotor magnetically connected to more than two poles, a stator composed of material of high magnetic transmission factor magnetically engaging with the rotor, means composed of coil magnetically connected to the stator and for positioning the rotor in advance in order to determine a rotating direction of the rotor and means a step motor driven by an alternating pulses, wherein a position of the rotor is brought back to a former magnetically horizontal position from an original position thereof by applying a reverse polarity pulse to the coil just before a normal pulse, and then the rotor is rotated in reverse by the normal pulse whereby a needle may be reversed.

REFERENCES:
patent: 4048548 (1977-09-01), Nakajima et al.
patent: 4055785 (1977-10-01), Nakajima et al.
patent: 4066947 (1978-01-01), Nakajima et al.

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