Optics: measuring and testing – Photometers – Light absorbing
Patent
1978-11-17
1981-04-07
McGraw, Vincent P.
Optics: measuring and testing
Photometers
Light absorbing
356225, 250211R, G01J 140, G01J 142, H01J 4014
Patent
active
042602564
ABSTRACT:
An apparatus for measuring the intensity of light reflected from a scene along an optical path includes a photoelectric cell, an optical lens and a light-attenuating device that has a gradation of opacity along one dimension that extends generally transversely to the optical path. The device may be moved transversely of the optical path to vary the average amount of light impinging upon the cell. The cell has a gradation of sensitivity to light along a dimension that extends generally transversely of the optical path. The sensitivity varies along the cell dimension and the cell is so disposed so as to be correspondingly more sensitive to light that has passed through more opaque portions of the light attenuating device and less sensitive to light that has passed through less opaque portions of the light attenuating device. The apparatus may be incorporated in a photographic camera and may be coupled to the camera's exposure control mechanism.
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patent: 2527800 (1950-10-01), Dorsey
patent: 2740901 (1956-04-01), Graham
patent: 2806405 (1957-09-01), Amand
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patent: 3028500 (1962-04-01), Wallmark
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patent: 3205767 (1965-09-01), Weber et al.
patent: 3409378 (1968-11-01), Shimomura
patent: 3723934 (1973-03-01), Kubitzek
Arndt D. R.
Bovernick Rodney B.
Eastman Kodak Company
McGraw Vincent P.
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