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:
Nov. 17, 1998
Filed:
Dec. 23, 1996
Keiji Ohtaka, Yokohama, JP;
Yasuo Suda, Yokohama, JP;
Keiji Nagata, Yokohama, JP;
Kenichiro Yamashita, Matsudo, JP;
Terutake Kadohara, Yokohama, JP;
Hitoshi Onoda, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An apparatus which has a finder optical unit for observing therethrough an image formed by an objective lens, an optical unit for forming a pair of distributions of light quantity on the basis of light beams transmitted through the different pupils of the objective lens, a sensor unit for receiving the pair of distributions of light quantity, a main mirror disposed in an optical path leading to the objective lens and the optical unit for reflecting the light beam from the objective lens to the finder optical unit, and a reflecting mirror having a curved surface having its concave surface facing the light incidence side for reflecting the light beam transmitted through the main mirror in the direction of the optical unit which is opposite to the finder optical unit, and which well makes focus detection possible for a wide field area formed by the objective lens.