Power supply for calculators

Details Power supply for calculators Power supply for calculators

1973-11-29

1976-05-04

Trafton, David L.

Communications: electrical

Systems

Portable self-contained

235156, 3403091, 340332, 340377, G08B 536

Patent

active

039551857

ABSTRACT:
To avoid useless power consumption in electronic apparatus equipped with display units, for example, such as electronic desk-top calculators with light-emitting diodes, a pair of timer arrangements are provided between the display units and power source thereof. The first timer arrangment serves to turn the display units from the first display condition to the second display condition or more particularly reduce brightness of the display units. After operating the first timer arrangment, power supply is inhibited to at least the display units by means of the second timer arrangment.

REFERENCES:
patent: 2769970 (1956-11-01), Kratville
patent: 3714867 (1973-02-01), Dargent
patent: 3755806 (1973-08-01), Bunting

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