Electronic timepiece

Details Electronic timepiece Electronic timepiece

1982-01-06

1984-04-17

Isen, Forester W.

Horology: time measuring systems or devices

Regulating means

For compensation

331176, 331177R, G04B 1720

Patent

active

044431163

ABSTRACT:
An electronic timepiece is provided with a timebase signal source comprising a relatively low frequency quartz crystal oscillator circuit and with means for compensating the timebase signal frequency for the effects of temperature changes on the low frequency oscillator circuit, and further with means for comparing the timebase signal frequency with the frequency of a relatively high frequency quartz crystal oscillator circuit having high stability against aging changes, to thereby compensate for changes in the timebase frequency caused by aging of the low frequency quartz crystal vibrator, this comparison being carried out only within a specific narrow range of operating temperatures.

REFERENCES:
patent: 4024416 (1977-05-01), Fujita et al.
patent: 4148184 (1979-04-01), Akahane et al.
patent: 4241435 (1980-12-01), Fujita et al.
patent: 4254492 (1981-03-01), McDermott
patent: 4264967 (1981-04-01), Fujita et al.
patent: 4290130 (1981-09-01), Lowdenslager et al.
patent: 4325036 (1982-04-01), Kuwabara
patent: 4344046 (1982-08-01), Zumsteg

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