System for detecting the focus condition of a cata-dioptric lens

Details System for detecting the focus condition of a cata-dioptric lens System for detecting the focus condition of a cata-dioptric lens

1988-05-13

1990-03-13

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

354406, G01J 120

Patent

active

049085050

ABSTRACT:
A focus condition detecting system for a cata-dioptric lens wherein it can be judged correctly whether or not detection of a focus condition is possible, and a cata-dioptric lens for use with the focus condition detecting system. The system comprises a focus condition detecting means for detecting a relative displacement between a pair of images of light formed by a pair of optical means from beams of light from a pair of different areas of a plane of an exit pupil of a cata-dioptric lens to detect a focus condition of the lens. Data regarding outer and inner radii of an exit pupil or some other peculiar data are fixedly stored in the lens. The data are successively forwarded to a camera body, and depending upon the data, it is judged whether optically accurate detection of a focus condition is possible from a combination of the optical means and the lens. When the judgment is affirmative, the detecting means is rendered operative. A set of interchangeable lenses which contribute to improvement in function of a body of a camera and also to development of a camera system is also provided.

REFERENCES:
patent: 4322616 (1982-03-01), Fukuhara et al.
patent: 4373791 (1983-02-01), Araki
patent: 4509842 (1985-04-01), Taniguchi et al.
patent: 4671640 (1987-06-01), Akada et al.
patent: 4734730 (1988-03-01), Ootsuka et al.
patent: 4794416 (1988-12-01), Mukai et al.

Affiliated with

Also associated with

Rating

System for detecting the focus condition of a cata-dioptric lens does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with System for detecting the focus condition of a cata-dioptric lens, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System for detecting the focus condition of a cata-dioptric lens will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-52184