Digital display type electronic time keeper

Details Digital display type electronic time keeper Digital display type electronic time keeper

1975-04-01

1976-09-14

Weldon, Ulysses

58 23R, 58 23BA, 58 50R, G04B 1924

Patent

active

039798992

ABSTRACT:
A digital display type electronic time keeper is disclosed which has a time standard signal generating source having a crystal oscillating circuit. Means are provided for frequency-dividing the time standard signal, for counting the signal fed from the means for frequency-dividing the time standard signal which is driven by at least one power source, and for decoding the counted data. A display device having a positive dielectric anisotropy twisted effect type nematic liquid crystal is driven by the decoded signal. A booster using two phase signals taken from a part of the frequency dividing means provides a power source for driving the counting means, the decoding means and the display device. A level adjuster matches the output of the frequency-dividing means and the input of the counting means and is disposed therebetween. Additional means are provided for correcting the display data of the display device.

REFERENCES:
patent: 3747327 (1973-07-01), Uchiyama
patent: 3796037 (1974-03-01), Fujita
patent: 3802182 (1974-04-01), Fujita
patent: 3818484 (1974-06-01), Nakamura et al.
patent: 3842589 (1974-10-01), Luce et al.
patent: 3864905 (1975-02-01), Richardson
patent: 3886726 (1975-06-01), Williams et al.
patent: 3889459 (1975-06-01), Lu

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