Electronic timepiece utilizing main oscillator circuit and secon

Details Electronic timepiece utilizing main oscillator circuit and secon Electronic timepiece utilizing main oscillator circuit and secon

1977-07-21

1979-04-10

Schaefer, Robert K.

Oscillators

Relaxation oscillators

331 1R, 331 2, G04C 300

Patent

active

041481844

ABSTRACT:
An electronic timepiece having a main oscillator circuit including a first quartz crystal vibrator as a time standard and also having a secondary oscillator circuit including a further quartz crystal vibrator as a time standard for reducing the affect of temperature on the accuracy of the timepiece by utilizing the different temperature characteristics of the respective time standards is provided. The main oscillator circuit produces a high frequency time standard signal having a first frequency rate that is determined, at least in part, by the temperature characteristic of the first time standard, which characteristic includes an inflection peak at a specific temperature. The second oscillator circuit produces a second high frequency time standard signal having a second predetermined frequency, determined, at least in part, by the temperature characteristic of the second time standard being distinct from that of the first time standard. Phase detection circuitry is provided for producing a phase detection signal in response to detecting a predetermined frequency difference in phase between the first and second high frequency time standard signals when the temperature is 10.degree. higher or lower than the specific temperature at which the first time standard has its inflection peak. A display is provided for displaying actual time in response to receiving a low frequency time signal produced by divider circuitry. A frequency adjustment circuit is coupled intermediate the phase detection circuitry and the divider circuitry for adjusting the frequency of the low frequency time signal produced by the divider circuitry when a phase detection signal is applied thereto.

REFERENCES:
patent: 3530663 (1970-09-01), Marti
patent: 3609579 (1971-09-01), Chappell et al.
patent: 3807164 (1972-10-01), Zaisky et al.
patent: 3938316 (1976-02-01), Morokawa et al.
patent: 3978650 (1976-09-01), Hashimoto et al.
patent: 4068462 (1978-01-01), Duff et al.
patent: 4092604 (1978-05-01), Berney

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