Battery check device for a camera

Details Battery check device for a camera Battery check device for a camera

1994-09-26

1996-06-18

Perkey, W. B.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307 39, G03B 726, H02J 100

Patent

active

055283357

ABSTRACT:
A battery check device, suitable for use in a camera, for reliably checking the essential capacity of a battery power source without affecting the voltage recovery of the battery power source after a long period of non-use. The battery check device monitors a starting switch, for example, a main switch or a release button, with a timer circuit and compares a switch interval between a previous time the starting switch was set ON and a present time the starting switch is set ON with a predetermined time. When the switch interval is within the predetermined time, a battery check circuit checks the power supply capacity of the battery power source using a light load circuit. When the interval is not within the predetermined time, the battery check circuit checks the power supply capacity of the battery using a heavy load circuit.

REFERENCES:
patent: 4458996 (1984-07-01), Harigaya et al.
patent: 4469990 (1984-09-01), Maruyama et al.

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