Patent
1993-02-25
1994-11-15
Adams, Russell E.
G03B 726
Patent
active
053653050
ABSTRACT:
In a power supply control circuit for a display of a camera, when an operation signal is input, a control circuit determines that an operation mode exists and activates a boosting circuit and a voltage dividing circuit. The control circuit activates a power supply switching circuit to switch the power supply for a display unit driving circuit to the output of the voltage dividing circuit. In response to the input operation signal, the control circuit executes such processes as photographing, film rewinding and/or film loading by the operation of the rear lid switch, etc. Upon completion of the operation, the control circuit sets the mode to a waiting mode, and monitors the detection output of a battery voltage detecting circuit. If the voltage of the battery exceeds a predetermined voltage stored in the ROM in the control circuit, the control circuit determines that the battery voltage has been restored, and applies a power supply switching signal to a power supply switching circuit, so that the power supply for the display unit driving circuit is switched to the battery and the boosting circuit and the converting circuit are both deactivated
REFERENCES:
patent: 4645326 (1987-02-01), Kiuchi et al.
patent: 4855781 (1989-08-01), Hoshino
patent: 4914469 (1990-04-01), Ishimura et al.
patent: 5032864 (1991-07-01), Ishimura et al.
patent: 5136327 (1992-08-01), Ogawa
Saito Hiroyuki
Seki Yoichi
Adams Russell E.
Seikosha Co. Ltd.
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