Exposure controlling device for camera

Details Exposure controlling device for camera Exposure controlling device for camera

1996-12-30

1998-08-11

Perkey, W. B.

Photography

With object illumination for exposure

Having exposure synchronizer

396242, 396451, G03B 700, G03B 1505

Patent

active

057940851

ABSTRACT:
An exposure controlling device comprises, a controlling unit that controls a DC motor, a calculating unit that calculates a time period between a predetermined starting point and a point where a predetermined aperture area is obtained during the forward rotation of the DC motor, and a timer for counting the time period from the starting point. The controlling unit controls, at the time of an exposure, the DC motor to rotate reversely for a predetermined time period at a first step, to rotate forward to open shutter blades of a lens shutter at a second step and to rotate reversely to close the shutter blades at a third step.

REFERENCES:
patent: 5028946 (1991-07-01), Shinozaki et al.

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