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US 4,226,081 AGranted
Electronic timepiece
AssigneeCitizen Watch Co., Ltd.
InventorSingo Ichikawa
Life of this patent
Estimating the term…
Abstract
An electronic timepiece which makes use of a lithium battery having a high electric power capacity is disclosed. The timepiece comprises in combination a voltage converter and a voltage detection circuit. The output signal delivered from the voltage detection circuit causes the output voltage from the voltage converter to change in response to the battery voltage so as to reduce electric power consumed by electric circuits.
Claims8
An electronic timepiece comprising:
- (a) a time reference signal supply source for generating a time reference signal;
- (b) a time keep circuit for preparing a time keep signal on the basis of said time reference signal;
- (c) a time display device driven by the output delivered from said time keep circuit and displaying times;
- (d) a power source;
- (e) a voltage detection circuit for detecting the voltage of said power source and generating a first signal when the voltage is higher than a predetermined value and a second signal when the voltage is lower than the predetermined value;
- and
- (f) a voltage converter connected to the power source for providing an output voltage which is less than the voltage of the power source and including a circuit for connecting the output voltage of said voltage converter to said time reference signal supply source and to said time keep circuit when the first signal from said voltage detection circuit is generated and for connecting the power source directly to said time reference signal supply source and to said time keep circuit when the second signal from said voltage detection circuit is supplied.
4 more elements
Dependencies are inferred from the claim text.