Shutter control circuit for cameras

Details Shutter control circuit for cameras Shutter control circuit for cameras

1974-10-09

1976-04-20

Peters, Jr., Joseph F.

354 60R, G03B 708, G01J 144

Patent

active

039523187

ABSTRACT:
An electrical system to be used in a camera for controlling exposure time. The electrical system includes a pair of substantially identical constant voltage sources respectively having inputs connected together. A buffer circuit is coupled between an interconnection of these inputs and the collector of a compression transistor to which a photosensitive means is connected and whose base is coupled to one of the constant voltage sources. A timing circuit is coupled to an expansion transistor, whose base is coupled to the other of the constant voltage sources.

REFERENCES:
patent: 3670637 (1972-06-01), Mori
patent: 3690230 (1972-09-01), Mori et al.
patent: 3736851 (1973-06-01), Ono
patent: 3781551 (1973-12-01), Mori
patent: 3836921 (1974-09-01), Mori
patent: 3848986 (1974-11-01), Nuiyahowa et al.

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