Shutter control circuit for cameras

Details Shutter control circuit for cameras Shutter control circuit for cameras

1974-05-13

1976-11-02

Adams, Jr., Russell E.

354 50, 354 60R, G03B 708

Patent

active

039900860

ABSTRACT:
A shutter control circuit for a camera including a timing circuit for measuring the exposure time during which the shutter will remain open. The shutter control circuit further includes a switching circuit having a switching transistor with a collector, coupled to the timing circuit, an emitter and a base. A first constant voltage source is connected to the emitter of the switching transistor. A manual exposure control circuit includes an emitter follower circuit with a transistor complementary to the switching transistor. A second constant voltage source is also included in the manual exposure control circuit and is coupled to the emitter follower circuit. The voltage level of the second constant voltage source is capable of being manually set in accordance with the desired shutter time. The output of the emitter follower circuit is coupled to the base of the switching transistor. The shutter control circuit can include an automatic exposure control circuit which automatically determines the exposure time based upon exposure determining factors. A selection circuit is interconnected between the base of the switching transistor and between both the manual and automatic exposure control circuits for selecting one of said last two circuits to be interconnected with the switching circuit.

REFERENCES:
patent: 3625124 (1971-12-01), Miyakawa
patent: 3641890 (1972-02-01), Ono
patent: 3695157 (1972-10-01), Miyakawa
patent: 3821757 (1974-06-01), Kobori
patent: 3883882 (1975-05-01), Mori

Affiliated with

Also associated with

Rating

Shutter control circuit for cameras does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Shutter control circuit for cameras, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Shutter control circuit for cameras will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1163052