Detection device of electronic timepiece

Details Detection device of electronic timepiece Detection device of electronic timepiece

1980-04-28

1982-09-28

Miska, Vit W.

Horology: time measuring systems or devices

Chronological

With mechanical or electromechanical driven display

368157, 318696, G05B 1940, G04B 1900, G04F 500

Patent

active

043521720

ABSTRACT:
An electronic timepiece has a stepping motor comprised of a stator, rotor and coil, and circuitry for producing and applying driving pulses to the coil to effect stepwise rotation of the rotor. The presence of an external alternating magnetic field is detected by switching the coil from an open-circuit condition to a low impedance loop comprised of the coil and a low impedance element. The rotation of the rotor is detected by alternately switching the coil between the low impedance loop and a high impedance loop comprised of the coil and a high impedance element. Control circuitry controls the switching operations to ensure that the magnetic field detection and the rotor rotation detection are carried out at different times.

REFERENCES:
patent: 4157647 (1979-06-01), Takahash et al.
patent: 4209971 (1980-07-01), Ueda et al.

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