Focus detecting device

Details Focus detecting device Focus detecting device

1987-03-23

1988-03-22

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

354403, G01J 120

Patent

active

047330627

ABSTRACT:
A focus detecting device comprising a light source means alternately producing a pair of light beams directed to the surface of an object, a light receiving element arranged on an image surface and detecting the image positions of the pair of light beams reflected on the object surface and a signal processing means detecting the displacements of the image positions of the pair of light beams with signals from the light receiving element, in order to simplify the formation of the entire device and to be able to quickly focus even a dark object.

REFERENCES:
patent: 3836919 (1974-09-01), Matsumoto et al.
patent: 4427880 (1984-01-01), Kanade et al.
patent: 4441810 (1984-04-01), Momose et al.
patent: 4445029 (1984-04-01), Nagaoka et al.
patent: 4501961 (1985-02-01), Stauffer
patent: 4541702 (1985-09-01), Momose et al.
patent: 4542971 (1985-09-01), Numata
patent: 4543476 (1985-09-01), Horikawa

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