Photometric apparatus for camera

Details Photometric apparatus for camera Photometric apparatus for camera

1981-12-29

1984-09-25

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

354425, G03B 7083

Patent

active

044737440

ABSTRACT:
A photometric apparatus for a camera includes a diode for logarithmic compression and a semiconductor analog switch in series connection between an output terminal of a first operational amplifier and a second operational amplifier forming an integration circuit by connecting a photoelectric transducer element for a photometry purpose. A logarithimic compression signal for an exposure display and a photocurrent integration signal for an exposure control are derived from the first and the second operational amplifier, respectively.

REFERENCES:
patent: 4100407 (1978-07-01), Takahashi
patent: 4390258 (1983-06-01), Mizokami
patent: 4408852 (1983-10-01), Yamasaki
Japanese Laid Open Patent Application; Serial No. Sho 52-114134, filed Sep. 22, 1977; Inventor Masahiro Kawasaki.

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1770804