The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 08, 1998
Filed:
Apr. 10, 1996
Noriyuki Iyama, Hachioji, JP;
Olympus Optical Co., Ltd., Tokyo, JP;
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.