Camera having focus detecting optical system

Details Camera having focus detecting optical system Camera having focus detecting optical system

1996-04-10

1998-09-08

Lee, Eddie C.

Photography

Having photocell at specific position within camera

Having means for changing the photocell field of view

396268, G01J 120, G03B 1336

Patent

active

058059415

ABSTRACT:
A camera having a focus detecting optical system includes a quick-return mirror having the function of splitting the optical path of a light beam coming from a photographic lens into two so that one is reflected and the other is transmitted, a submirror attached to the quick-return mirror, and an imaging plane disposed at a position of an imaging surface of the photographic lens. The focus detecting optical system including a field mask, a condenser lens placed close to a preset imaging plane equivalent to the imaging plane of the photographic lens, a photoelectric converting element array, and a reimaging optical system for re-forming an image formed by the photographic lens on the photoelectric converting element array. An aspect ratio AR of the imaging plane satisfies the following condition: 0.4<AR<0.63.

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