Light-measuring systems
AssigneeAsahi Kogaku Kogyo Kabushiki Kaisha
InventorTsukumo Nobusawa
Life of this patent
Estimating the term…
Abstract
A light-responsive system which includes a plurality of photosensitive elements respectively directed to different parts of a scene for respectively providing electrical inputs according to the brightness of the light at the different parts of the scene. The several inputs are supplied to a plurality of electrical circuits which in turn are connected with an output unit, these circuits operating in such a way that the output unit will be actuated only by that one of the inputs which corresponds to that part of the scene which has the maximum brightness or the minimum brightness. In this way it is possible to provide an output corresponding either to the maximum brightness of the scene or the minimum brightness of the scene without requiring scanning of the scene.
Claims18
In a light-responsive system, a plurality of photosensitive means for respectively providing electrical inputs when light is received by said plurality of photosensitive input means, with said inputs respectively having magnitudes determined by the brightness of the light received by said plurality of photosensitive input means, support means supporting said plurality of photosensitive input means respectively in positions for receiving light from different parts of a scene so that when the scene has a condition of non-uniform brightness the magnitudes of said inputs will vary with a pair of said photosensitive input means respectively providing inputs of maximum and minimum magnitude, electrical output means for providing a given output, and a plurality of electrical circuit means respectively connected electrically with said plurality of photosensitive input means for respectively producing given signals in a sequence determined by said magnitudes and all connected electrically with said output means for providing at the latter an output determined by the signal produced by the electrical circuit means connected to at least one of said pair of photosensitive input means.
In a light-responsive system, a plurality of photosensitive input means for respectively providing electrical inputs when light is received by said plurality of photosensitive input means, with said inputs respectively having magnitudes determined by the brightness of the light received by said plurality of photosensitive input means, support means supporting said plurality of photosensitive input means respectively in positions for receiving light from different parts of a scene so that when the scene has a condition of non-uniform brightness the magnitudes of said inputs will vary with a pair of said photosensitive input means respectively providing inputs of maximum and minimum magnitude, electrical output means for providing a given output, and a plurality of electrical circuit means respectively connected electrically with said plurality of photosensitive means and all connected electrically with said output means for providing at the latter an output determined by at least of said pair of photosensitive input means, said plurality of electrical circuit means and said output means including a single timing circuit which is common to said plurality of electrical circuit means and said output means.
Dependencies are inferred from the claim text.