Light measuring device for camera

Details Light measuring device for camera Light measuring device for camera

1982-07-30

1984-10-16

Perkey, William B.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

354481, 354482, 3542891, 250237R, 350314, 350315, 350286, G03B 7099, G03B 1720, G02B 504

Patent

active

044771720

ABSTRACT:
A light measuring device for cameras with a photosensitive element positioned to receive light reflected from a film surface or shutter surface. A collection lens and a diffusion plate having a plurality of stages of different diffusing characteristics are placed between the reflecting surface and the photosensitive element. The light measuring regions can be changed over as the stages of the diffusion plate are selectively put in the path of the light traveling to the photosensitive element.

REFERENCES:
patent: 3536408 (1970-10-01), Norwood
patent: 3575095 (1971-04-01), Keck
patent: 3612703 (1971-10-01), Irisawa
patent: 4180312 (1979-12-01), Schmidt et al.
patent: 4277156 (1981-07-01), Fukushima et al.

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