Electronic timepiece

Details Electronic timepiece Electronic timepiece

1979-12-03

1981-08-04

Miska, Vit W.

Horology: time measuring systems or devices

Chronological

With electro-optical display

368201, G04C 1900, G04B 1712

Patent

active

042825946

ABSTRACT:
An electronic timepiece is equipped with a frequency division ratio adjustment circuit controlled by switch means, for producing a running rate correction signal that is aperiodically added in frequency to the output of a standard frequency oscillator, to correct the running rate of the timepiece, and is provided with externally controlled gate means for inhibiting this aperiodic frequency addition, so that the actual frequency of the standard frequency oscillator may be measured by means such as an external monitoring device which detects a display drive or modulation signal frequency through electrostatic or electromagnetic coupling to the timepiece display.

REFERENCES:
patent: 3916612 (1975-11-01), Morokawa et al.
patent: 4023344 (1977-05-01), Mukaiyama
patent: 4055945 (1977-11-01), Schwarzschild
patent: 4101838 (1978-07-01), Aihara et al.
patent: 4141208 (1979-02-01), Witipple et al.
patent: 4154053 (1979-05-01), Cheteliat et al.

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