Photovoltaic electronic timepiece

Details Photovoltaic electronic timepiece Photovoltaic electronic timepiece

1987-02-12

1988-11-15

Roskoski, Bernard

Horology: time measuring systems or devices

Power supply details

Electrical

368204, G04B 100

Patent

active

047854367

ABSTRACT:
In an electronic timepiece powered by a photovoltaic cell, the supply voltage fluctuates a great deal due to the varying amounts of light received by the photovoltaic cell. This presents special considerations for a low voltage alarm circuit. The present invention combines two alarms. First, there is a charging alarm which responds to voltage and which indicates that voltage is low and that the amount of light should be increased. If the light is increased, the circuit will continue to operate and no reset operation is needed. If on the other hand the voltage drops to the point where the circuit actually stops, a stop alarm is activated. The stop alarm is not responsive to voltage level. Instead, it is responsive to the fact that the circuit's oscillator has stopped. Furthermore, the stop alarm is provided with a memory and it will not automatically be reset if the voltage is increased.

REFERENCES:
patent: 4129981 (1978-12-01), Nomura et al.
patent: 4173756 (1979-11-01), Kawagai et al.
patent: 4175377 (1979-11-01), Ichikawa
patent: 4219999 (1980-09-01), Ichikawa et al.
patent: 4280208 (1981-07-01), Nomura
patent: 4487512 (1984-12-01), Price
patent: 4540292 (1985-09-01), Rubenstein et al.

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