Electronic watch

Details Electronic watch Electronic watch

1977-04-20

1979-05-22

Schaefer, Robert K.

58 855, G04C 300

Patent

active

041552180

ABSTRACT:
In an electronic watch, the content of the memory associated with the adjusting circuit of the division ratio of the frequency divider is modified at each correction of the display to compensate for the frequency error of the crystal oscillator and to thereby reduce the running error of the watch. Such electronic watches use a crystal oscillator whose frequency is not optimum. To compensate for the frequency variations due to manufacturing tolerances, age and temperature, correction circuits are incorporated into such watches. When an operator acts on a switch on the case of the watch to correct the time display indication, the content of the memory is modified to correct for the frequency error of the crystal oscillator.

REFERENCES:
patent: 3777471 (1973-12-01), Koehler et al.
patent: 3889460 (1975-06-01), Yasukawa et al.
patent: 3895486 (1975-07-01), Hammer et al.
patent: 3914931 (1975-10-01), Tsuruishi
patent: 4030284 (1977-06-01), Portmann
patent: 4044547 (1977-08-01), Kusumoto
patent: 4045952 (1976-03-01), Kashio
patent: 4067187 (1978-01-01), Sekiya et al.

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