Light sensor with position compensation accomplished by area dis

Details Light sensor with position compensation accomplished by area dis Light sensor with position compensation accomplished by area dis

1995-12-21

1997-04-29

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

2502061, 250214R, 250237R, G01B 1100

Patent

active

056251823

ABSTRACT:
A light sensor comprises two light sensitive areas that are shaped to physically compensate for the decrease in light intensity resulting from movement of a movable object in which an aperture is formed. Movement of the aperture causes the light passing through the aperture to have a decreased circumscribed angle that results in a decrease of light intensity impinging on a light sensitive component. In order to avoid the nonlinearity that can result from the decrease in light intensity as a function of the physical position of a movable object being sensed, the light sensitive areas are tapered by selecting the width of the light sensitive area as a function of the distance from a reference line. The light sensitive areas are tapered by arranging the edges of the areas so that the minimum width of each of two light sensitive areas are abutting each other at the reference line and the edges of both light sensitive areas are tapered outward away from each other at positions farther from the reference line.

REFERENCES:
patent: 5079432 (1992-01-01), Miller
patent: 5194919 (1993-03-01), Katayama
patent: 5371359 (1994-12-01), Hagiuda et al.
patent: 5483060 (1996-01-01), Sugiura et al.

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