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:
Apr. 02, 2002
Filed:
Jul. 07, 2000
Kenichi Kimura, Kanagawa-ken, JP;
Tsunefumi Tanaka, Kanagawa-ken, JP;
Toshiya Kurihashi, Tokyo, JP;
Shigeo Ogura, Tokyo, JP;
Keisuke Araki, Kanagawa-ken, JP;
Makoto Sekita, Kanagawa-ken, JP;
Nobuhiro Takeda, Kanagawa-ken, JP;
Yoshihiro Uchino, Fukuoka-ken, JP;
Toshikazu Yanai, Kanagawa-ken, JP;
Norihiro Nanba, Kanagawa-ken, JP;
Hiroshi Saruwatari, Kanagawa-ken, JP;
Takeshi Akiyama, Kanagawa-ken, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A reflecting-type optical system according to the invention includes an optical element composed of a transparent body having an entrance surface, an exit surface and at least three curved reflecting surfaces of internal reflection. A light beam coming from an object and entering at the entrance surface is reflected from at least one of the reflecting surfaces to form a primary image within the optical element and is, then, made to exit from the exit surface through the remaining reflecting surfaces to form an object image on a predetermined plane. In the optical system, 70% or more of the length of a reference axis in the optical element lies in one plane.