Control circuit for a memory type electric shutter

Details Control circuit for a memory type electric shutter Control circuit for a memory type electric shutter

1976-12-17

1979-10-09

Adams, Russell E.

354 50, 354 51, 354 60R, G03B 708

Patent

active

041704118

ABSTRACT:
In the system disclosed, a feedback circuit connects the output of the last of a plurality of cascaded amplifier stages to the input of the first stage. A photoelectric transducer is connected to one of the stages. The feedback connection compresses the output signal relative to the signal at the photoelectric transducer, logarithmically. Preferably all the stages are linear and the feedback circuit is linear so that no logarithmic members are required. Preferably each of the stages is composed of an amplifier and a connection corresponding to an emitter-follower connection. A suitable system then utilizes the compression characteristic in a shutter control. This system may use a second compression circuit comparable to the first. Additional photographic information may be applied to the input of any of the stages in either compression circuit.

REFERENCES:
patent: 3426357 (1969-02-01), Paulus
patent: 3670637 (1972-06-01), Mori et al.
patent: 3678826 (1972-07-01), Mori et al.
patent: 3726200 (1973-04-01), Ogiso et al.

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