Horology: time measuring systems or devices – Electrical time base – Solid state oscillating circuit type
Patent
1996-09-20
1999-08-03
Miska, Vit
Horology: time measuring systems or devices
Electrical time base
Solid state oscillating circuit type
318685, 318696, G04B 1900, G05B 1940, H02P 800
Patent
active
059333928
ABSTRACT:
An electronic watch 400 which comprises a power supply 401 and a watch circuit 402. The watch circuit 402 comprises an oscillator circuit 403, a frequency divider circuit 404, a drive pulse generation means 405, a drive motor 406 which, in response to a drive pulse P1 that is output by the above-noted drive pulse generation means 405, drives at least one of the hour/minute, second, and functional hands including chronograph hands, a drive circuit means 407 which controls the drive of the drive motor 406, a drive circuit control means 408 which controls the above-noted drive circuit means 407, and a control condition detection means 409 which is connected to the above-noted drive circuit control means 408 and which detect the control condition in the drive circuit control means 408, the control condition detection means 409 being provided with a non-proper condition detection means 410 which senses the occurrence of a condition in which it is not possible to properly drive the above-noted drive motor 406 under a prescribed condition in a prescribed control mode currently being executed, and a control mode change-instructing means 411 which, in response to a detection signal of the above-noted non-proper condition detection means 410, issues an instruction to the drive circuit control means 408 to change the control mode currently being executed.
REFERENCES:
patent: 4192131 (1980-03-01), Hosokawa et al.
patent: 4326278 (1982-04-01), Shida et al.
patent: 4340946 (1982-07-01), Kanno et al.
patent: 4370065 (1983-01-01), Kawamura et al.
patent: 4382691 (1983-05-01), Shida et al.
patent: 5247235 (1993-09-01), Tu et al.
Kanno Fumio
Sato Koichi
Citizen Watch Co. Ltd.
Miska Vit
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