Focus detecting system

Details Focus detecting system Focus detecting system

1981-10-21

1983-10-25

Adams, Russell E.

354 31, 354 59, G03B 708

Patent

active

044115040

ABSTRACT:
A focus detecting system is disclosed which detects a focusing state of an imaging optical system with respect to an object on the basis of signals, of the image formed by the optical system, generated from three light-receiving sections which are disposed at positions substantially corresponding to points in front of, on and behind a predetermined focal plane of the optical system. A substantial range of detection of the light-receiving section among the three light-receiving sections which is disposed at a point substantially corresponding to the predetermined focal plane is limited to be narrower than those of the remaining two light-receiving sections.

REFERENCES:
patent: 3532045 (1970-10-01), Genahr
patent: 4277156 (1981-07-01), Fukushima et al.
patent: 4333716 (1982-06-01), Saltane et al.
patent: 4349254 (1982-09-01), Jyojiki et al.

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