Camera having an exposure control device for minimizing heating

Details Camera having an exposure control device for minimizing heating Camera having an exposure control device for minimizing heating

1993-04-08

1994-06-28

Perkey, W. B.

3542351, G03B 908

Patent

active

053251482

ABSTRACT:
An exposure control device for a camera having a shutter mechanism, a solenoid serving as an electromagnetic drive, a presser for pressing a solenoid plunger, and a control circuit for conduction control for the solenoid. After the solenoid attracts the plunger to open the shutter, conduction voltage for holding the plunger is controlled within a permissible range and become lower than the conduction voltage utilized for initially attracting the plunger. The heating of the solenoid is thus minimized. This control sequence prevents the breakdown of the solenoid and improved reliability in exposure control. Furthermore, power consumption in the camera is minimized.

REFERENCES:
patent: 3744385 (1973-07-01), Burgarella et al.
patent: 3769893 (1973-11-01), Douglas
patent: 3791278 (1974-02-01), Biber et al.

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