Photometric apparatus for single lens reflex camera

Details Photometric apparatus for single lens reflex camera Photometric apparatus for single lens reflex camera

1976-08-24

1977-12-20

Hix, L. T.

354 56, G03B 708, G03B 1720

Patent

active

040645177

ABSTRACT:
A photometric apparatus for single lens reflex camera and of the type in which an exposure value is determined by photometry of light which is transmitted through a photographic optical system and is reflected by at least one of the surfaces of a shutter blind and a film, said apparatus comprising a photoelectric transducer element for receiving light reflected by at least one of the surfaces of a shutter blind and a film, and an operational amplifier for biasing the photoelectric transducer element to maintain the voltage applied thereacross substantially null, thereby enabling a photometric output of the photoelectric transducer element to be effectively derived even when the amount of light received is minimal. The photometric apparatus, including a photoelectric transducer element, a photometry switch and associated circuitry are mounted upon a printed circuit board mounted within the camera to position the transducer element to receive reflected light from the film or the shutter.

REFERENCES:
patent: 3730063 (1973-05-01), Kobayashi et al.
patent: 3846805 (1974-11-01), Kiyohara et al.
patent: 3855603 (1974-12-01), Ichihashi

Affiliated with

Also associated with

Rating

Photometric apparatus for single lens reflex camera does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Photometric apparatus for single lens reflex camera, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Photometric apparatus for single lens reflex camera will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-602471