Focus detecting apparatus with multi-directional off axis detect

Details Focus detecting apparatus with multi-directional off axis detect Focus detecting apparatus with multi-directional off axis detect

1991-09-26

1993-08-03

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

354406, G03B 1336

Patent

active

052331733

ABSTRACT:
In a focus detecting apparatus provided with a focus detecting optical system comprising a field mask provided at the predetermined image plane position of a photo-taking lens and having an opening corresponding to a focus detection area, a condenser lens provided rearwardly of the field mask and positioned near the predetermined image plane of the photo-taking lens, a pair of stop masks provided rearwardly of the condenser lens and dividing the pupil of the photo-taking lens into two areas by a pair of openings therein, and a re-imaging lens system having a pair of re-imaging lenses corresponding to the openings in the stop mask, the image by the photo-taking lens being re-formed as secondary images on a pair of photoelectric conversion element arrays by the focus detecting optical system, the focus adjusted state of the photo-taking lens being detected from the relative positional relation between the secondary images, a plurality of focus detecting optical systems are disposed so that they have at least two focus detection areas about a position off the optical axis of the photo-taking lens and the directions of detection of these focus detection areas differ from each other, and the center positions of the pairs of openings in the stop masks of the focus detecting optical systems are set to different positions.

REFERENCES:
patent: 4949116 (1990-08-01), Karasaki et al.
patent: 4967226 (1990-10-01), Kuwata
patent: 4978988 (1990-12-01), Karasaki et al.
patent: 4982219 (1991-01-01), Uchiyama

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