Exposure factor switching circuit

Details Exposure factor switching circuit Exposure factor switching circuit

1979-02-15

1980-12-02

Gellner, Michael L.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361196, 307293, 323 4, G03B 908, H03K 513, H01H 4732

Patent

active

042368014

ABSTRACT:
An exposure factor switching circuit in a camera with an exposure control circuit having an emitter follower transistor adapted to apply a voltage through at least one transistor driven by a current flowing in the emitter thereof. A time constant circuit is adapted to control a shutter control magnet with an integration voltage due to a collector current of another transistor to the base of which the output of the emitter follower transistor is applied. A bias current supply circuit is employed having a plurality of transistors one of which is provided with a switch connected to the emitter thereof. The switch is operated to selectively activate the plurality of transistors to vary the emitter current of the emitter follower transistor.

REFERENCES:
patent: 3761741 (1973-09-01), Hoeft
patent: 3970874 (1976-10-01), Kawasaki
patent: 4061959 (1977-12-01), Ahmed

Affiliated with

Also associated with

Rating

Exposure factor switching circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2281306