Horology: time measuring systems or devices – Electrical time base – Solid state oscillating circuit type
Patent
1980-03-10
1983-01-18
Miska, Vit W.
Horology: time measuring systems or devices
Electrical time base
Solid state oscillating circuit type
368217, 318696, G04F 500, G04C 300
Patent
active
043689906
ABSTRACT:
An analog electronic timepiece has a stepping motor for rotationally driving the timepiece hands. The motor is driven by normal driving pulses during normal load conditions and in the event the normal driving pulses are unable to effect rotation of the motor, correction driving pulses of longer pulse width than the normal driving pulses are used. A detection circuit detects whether or not the motor has rotated by switching a resistance element in series with the motor drive coil after the application of each normal driving pulse. Rotation and non-rotation of the motor is determined by measuring the voltage across the resistance element and comparing the measured voltage with a reference voltage.
REFERENCES:
patent: 3855781 (1974-12-01), Chihara et al.
patent: 4032827 (1977-06-01), Dobratz
patent: 4114364 (1978-09-01), Takahashi
patent: 4208886 (1980-06-01), Regnier
Shida Masaharu
Torisawa Akira
Ueda Makoto
Adams Bruce L.
Burns Robert E.
Kabushiki Kaisha Daini Seikosha
Lobato Emmanuel J.
Miska Vit W.
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