Battery check device for camera

Details Battery check device for camera Battery check device for camera

1983-06-07

1985-03-05

Perkey, William B.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

354468, 354484, 340663, G03B 726, G08B 2100

Patent

active

045027749

ABSTRACT:
To accurately check a battery of a camera, a battery checking operation must be performed under maximum load current, namely, the load current of a shutter release magnet or the like. The invention avoids the effect of a current through the magnet triggering a photographic operation of the camera during a battery check by having currents flow to a plurality of selected loads of the camera, such as light emitting diodes, etc., instead of through the magnet. The plurality of loads are preselected to draw the total sum of load currents nearly equal to the maximum load current. A battery check can be performed without applying a drive current to the largest load and yet the accuracy of the battery check thus obtained equals that of the accuracy obtainable with the largest load.

REFERENCES:
patent: 3840296 (1974-10-01), Ho et al.
patent: 4181414 (1980-01-01), Ito et al.
patent: 4350418 (1982-09-01), Taguchi et al.
patent: 4370037 (1983-01-01), Uchidoi et al.

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