Exposure control device

Details Exposure control device Exposure control device

1975-12-24

1978-10-31

Adams, Russell E.

354 38, 354 60R, G03B 708

Patent

active

041237641

ABSTRACT:
An automatic exposure control device is disclosed which is capable of aperture dominant and shutter speed dominant exposure control operation as well as manual exposure control operation. A logarithmic compression circuit including transducers develops voltages directly dependent upon the APEX indicating quantities Bv, Sv, Tv and Av. For automatic operation one of the voltages dependent upon Tv or Av is set into the circuit by manual control, and the other is calculated by the APEX indication formula Bv + Sv = Tv + Av, and applied as an output to the shutter control or aperture control mechanism. An indicator means is connected in the circuit to provide Tv or Av indications depending on the exposure control mode selected for the camera.

REFERENCES:
patent: 3554104 (1971-01-01), Winkler et al.
patent: 3638544 (1972-02-01), Kitai
patent: 3829867 (1974-08-01), Ono
patent: 3863263 (1975-01-01), Itagaki
patent: 3896456 (1975-07-01), Toyoda
patent: 3896460 (1975-07-01), Sahara et al.
patent: 3945024 (1976-03-01), Hasegawa et al.
patent: 3950765 (1976-04-01), Nanba et al.
patent: 3964073 (1976-06-01), Korbori et al.
patent: 4011569 (1977-03-01), Mashimo et al.

Affiliated with

Also associated with

Rating

Exposure control device 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 control device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Exposure control device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1837882