Electronic timepiece

Details Electronic timepiece Electronic timepiece

1980-07-24

1982-07-20

Miska, Vit W.

Horology: time measuring systems or devices

Chronological

With mechanical or electromechanical driven display

368157, 318696, G04B 1900

Patent

active

043409466

ABSTRACT:
An electronic timepiece havig a stepping motor driving time indicating hands is provided with a system whereby the stepping motor is selectively driven at one of three different drive power levels, in accordance with the load currently being applied to the motor. Detection of the load level is performed by momentarily sampling a voltage induced in the motor drive coil during a short time interval following a drive pulse. The system provides rapid response to changes in load level, highly stable control, and excellent tolerance to variations in characteristics of different stepping motors and circuit components.

REFERENCES:
patent: 4272837 (1981-06-01), Deda et al.
patent: 4276626 (1981-06-01), Satoh et al.
patent: 4315329 (1982-02-01), Torisaua et al.

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