Title: Digital display type electronic time keeper

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.

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Inventors: Yoshida, Masateru (Itami, JA)
Nakao, Yoshio (Tanashi, JA)

Application Number: 564092
Filing Date: 1975-04-01
Publication_date: 1976-09-14
Assignee: Mitsubishi Denki Kabushiki Kaisha (Tokyo, JA); Citizen Watch Co., Ltd. (Tokyo, JA)
Primary Class(es): 368/29 368/167, 968/890, 968/902, 968/914, 968/941, 968/962, 968/DIG1
Other Classes:
US Patent Ref:

3747327	Jul, 1973	Uchiyama	58/23.
3796037	Mar, 1974	Fujita	58/50.
3802182	Apr, 1974	Fujita	58/23.
3818484	Jun, 1974	Nakamura et al.	58/23.
3842589	Oct, 1974	Luce et al.	58/23.
3864905	Feb, 1975	Richardson	58/50.
3886726	Jun, 1975	Williams et al.	58/23.
3889459	Jun, 1975	Lu	58/50.

Other Refs:
Primary Examiner: Weldon, Ulysses
Assistant Examiner:
Attorney: Oblon, Fisher, Spivak, McClelland & Maier