Photodetector element for optical rangefinders

Details Photodetector element for optical rangefinders Photodetector element for optical rangefinders

1988-08-04

1989-09-19

Adams, Russel E.

Optics: measuring and testing

Range or remote distance finding

With photodetection

354403, 354432, 356 1, G03B 300

Patent

active

048685917

ABSTRACT:
A photodetector element for use in a rangefinder of a camera comprises a first photoelectric element having a plurality of light receiving segments parallel to each other and adapted to provide a photoelectric output, and a second photoelectric element having a plurality of light receiving segments also parallel to each other with different available light receiving areas that increase from one side to the opposite side of the photodetector element to provide a photoelectric output that progressively varies from the one side to the other side of the photodetector element. The first and second photoelectric elements are electrically insulated from each other and so disposed that the light receiving segments thereof interfinger with spaces therebetween. The photodetector element provides two different photoelectric outputs from the first and second photoelectric elements whose intensities depend on the location on which incident light reflected from a subject falls. According to the ratio of the two photoelectric outputs, the distance of the subject is determined.

REFERENCES:
patent: 4477168 (1984-10-01), Hosoe
patent: 4579438 (1986-04-01), Sato et al.
patent: 4675517 (1987-06-01), Shiomi
patent: 4710011 (1987-12-01), Ushiro
patent: 4720723 (1988-01-01), Harunari et al.

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