Electrical exposure control device for photographic cameras

Claim 1

A universal circuit module adaptable for automatic exposure control of different types of camera shutter mechanisms, comprising: a pair of common terminals for connection to a power source; first switching means connected to said common terminals and comprising: first and second input terminals and a first output terminal adapted to receive a load, means for generating a signal in response to an input signal between said first and second input terminals, and means responsive to said signal for supplying electrical energy to said first output terminal with said load connected thereto; said circuit module further comprising: second switching means comprising: semiconductor switch means having a third input terminal adapted to at least be connected to said first ouput terminal, and a second output terminal adapted to receive a second load, said semiconductor switch means providing electrical energy to said second output terminal with said second load connected thereto; a third output terminal; means for supplying electrical energy to a third output terminal adapted to receive a third laod and adapted to be responsive to the actuation of said semiconductor switch means; and said circuit module further comprising: biasing means connected to said common terminals and having a third output terminal for biasing said semiconductor switch means whereby said semiconductor switch means may be actuated when the voltage at said third input terminal is one-half of the voltage of said power source.