Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1980-02-01
1983-11-08
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
354 25, G03B 300, H01J 4014
Patent
active
044144709
ABSTRACT:
In a focusing position detection apparatus for detecting a focusing position by causing rays of light coming from a peripheral portion of an exit pupil of a photographing lens to enter a pair of self-scanning type photoelectric element arrays through a lenticular lens group and then detecting the difference of the phases of the output signals from the photoelectric element arrays, in order to cause the rays of light to enter accurately the pair of self-scanning type photoelectric element arrays, a pitch Po between photoelectric elements which constitute the pair of photoelectric element arrays is suitably changed relative to a pitch P between small lens element which constitute the lenticular lens group, and furthermore, in order to detect the focusing position accurately, the boundary areas in the convex surfaces of the small lens elements of the lenticular lens group are made opaque so that noises in the output signals of the photoelectric element arrays are reduced.
REFERENCES:
patent: 2876099 (1959-03-01), Schenk
patent: 4071297 (1978-01-01), Leitz et al.
patent: 4185191 (1980-01-01), Stauffer
patent: 4230941 (1980-10-01), Stauffer
Nelms David C.
Ricoh & Company, Ltd.
Westin Edward P.
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