Horology: time measuring systems or devices – Electrical time base – Solid state oscillating circuit type
Patent
1978-12-04
1982-04-20
Miska, Vit W.
Horology: time measuring systems or devices
Electrical time base
Solid state oscillating circuit type
318696, G04B 1900, G04F 500
Patent
active
043262783
ABSTRACT:
An electronic timepiece having a stepping motor including a stator, rotor and coil, a driving circuit for applying driving pulses to the coil, an oscillating circuit for generating a time standard signal and a dividing circuit for dividing the time standard signal, is provided with a pulse combining circuit receptive of the output of the dividing circuit for producing a correction driving pulse having sufficient effective power to drive the motor under worst case conditions, a detector for detecting the rotation or non-rotation condition of the rotor after the application to the coil by the driving circuit of a normal driving pulse having less effective power than the correction driving pulse, and a controller for the driving circuit to apply normal driving pulses to the coil and responsive to the output of the detector to apply a correction driving pulse when a non-rotation condition is detected. The power consumption due to the pulse driving of the motor is minimized by incrementally decreasing the effective power of successive normal driving pulses and by incrementally increasing the effective power of successive normal driving pulses in response to the detection of a non-rotation condition by the detector.
REFERENCES:
patent: 3855781 (1974-12-01), Chihara et al.
patent: 3963946 (1976-06-01), Zajac
patent: 4031448 (1977-06-01), Adachi
patent: 4032827 (1977-06-01), Dobratz et al.
patent: 4114364 (1978-09-01), Takahashi
patent: 4209971 (1980-07-01), Ueda et al.
patent: 4212156 (1980-07-01), Kawamura et al.
Mandai Masaaki
Owada Shuji
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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