Horology: time measuring systems or devices – Electrical time base – Solid state oscillating circuit type
Patent
1978-01-19
1980-03-11
Truhe, J. V.
Horology: time measuring systems or devices
Electrical time base
Solid state oscillating circuit type
318685, 318696, 368219, G04C 300
Patent
active
041921313
ABSTRACT:
A step motor driving and control mechanism for use in an electronic timepiece for reducing the current consumption thereof is provided. Load detection circuitry detects the load condition of the step motor by detecting the signals induced in the drive coil of the step motor after each stepping of the rotor. The load detection circuitry selectively produces a load condition signal in response to detecting current peaks representative of a predetermined load condition of the step motor. The load detection circuitry is characterized by the use of MOS transistors therein for accurately detecting the occurrence of the current peaks. Driving and control circuitry is provided for receiving a low frequency timekeeping signal produced by a divider circuit and a load detection signal, when same is selectively produced by the load detection circuitry. In response to the presence or absence of a load detection signal applied thereto, the drive and control circuitry is adapted to vary the duration of the pulse width of a drive signal applied to the step motor to effect a driving of same.
REFERENCES:
patent: 3742697 (1973-07-01), Hama
patent: 3812670 (1974-05-01), Nikaido
patent: 4032827 (1977-06-01), Dobratz
patent: 4087959 (1978-05-01), Laesser
patent: 4158287 (1979-06-01), Nakajima et al.
Hosokawa Minoru
Ishii Hiroshi
Kawamura Yoshikazu
Okazaki Sakiho
Feeney William L.
Kabushiki Kaisha Suwa Seikosha
Truhe J. V.
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