Power supply system for memory unit of camera

Details Power supply system for memory unit of camera Power supply system for memory unit of camera

1985-12-24

1987-05-05

Perkey, William B.

Static information storage and retrieval

Magnetic bubbles

Guide structure

354468, 354484, 354106, 365229, 307 23, 307 28, 307 29, 307 39, 307 66, 307 86, G03B 726, G03B 1724, G11C 2900, H02J 900

Patent

active

046627367

ABSTRACT:
An electronic appliance having a microcomputer, peripheral devices controlled by the microcomputer, a main battery acting as power source, and a backup battery for backing up the main battery. Checking is made of whether the main battery is loaded in the appliance or not and whether the output voltage of the main battery is above a predetermined voltage or not. When the main battery is not loaded or when its output voltage is below the predetermined voltage, the backup battery is made available for preserving information in the memory inside or outside the microcomputer in good order, with operations of the peripheral devices being restricted at such times. Further, the disclosed electronic appliance includes means to prevent malfunctioning of the microcomputer and the peripheral devices when a new main battery has been loaded in the appliance as replacement for an exhausted main battery.

REFERENCES:
patent: 4091395 (1978-05-01), Kozuki et al.
patent: 4422163 (1983-12-01), Oldenkamp
patent: 4469990 (1984-09-01), Maruyama et al.
patent: 4509843 (1985-04-01), Hasegawa
patent: 4561754 (1985-12-01), Matsuyama

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