Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1985-01-29
1990-04-03
Adams, Russell E.
Optics: measuring and testing
Range or remote distance finding
With photodetection
354403, G03B 300, G01C 300
Patent
active
049135465
ABSTRACT:
A range finder for use with a still camera and the like, projects an infrared light beam to an object and the light beam reflected from the object is detected by a split photosensor. The photosensor is made up of two photodiodes connected in opposite polarity relationship so that a differential photocurrent produced by the diode pair is amplified. The reflected light beam is tracked so that the photosensor provides a zero output, and the distance to the object is determined from the time needed to detect the zero photosensor output.
REFERENCES:
patent: 3751154 (1973-08-01), Frazee et al.
patent: 3820129 (1974-06-01), Hosoe et al.
patent: 4497560 (1985-02-01), Nagaoka et al.
patent: 4529304 (1985-07-01), Ogawa et al.
patent: 4579450 (1986-04-01), Nagaoka et al.
Nagaoka Shinji
Nakajima Yuji
Sato Koji
Adams Bruce L.
Adams Russell E.
Seikosha Co. Ltd.
Wilks Van C.
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