Photometric method for cameras

Details Photometric method for cameras Photometric method for cameras

1981-07-23

1985-01-22

Perkey, William B.

354481, 354200, G03B 708, G03B 1324

Patent

active

044948530

ABSTRACT:
In cameras having an automatic exposure control of the through-the-lens photometric type, light exposure is determined by a photoreceptor responsive in turn to photometric sensitivity distribution. Such distribution can be determined by overall photometry, weighted photometry and spot photometry as controlled through the use of an electro-optical element serving as a focusing screen between the reflected incoming light and the photoreceptor. The photometric mode is varied by changing the applied voltage on the electro-optical element.

REFERENCES:
patent: 3324776 (1967-06-01), Matsumoto et al.
patent: 3347143 (1967-10-01), Jacobs
patent: 3724349 (1973-04-01), von Belvard
patent: 3866240 (1975-02-01), Tsujimoto
patent: 4054890 (1977-10-01), Shimomura
patent: 4174894 (1979-11-01), Shimomura
patent: 4208115 (1980-06-01), Proske

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