Patent Number: 6,166,866

Title: Reflecting type optical system

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.

Inventors: Kimura; Kenichi (Kanagawa-ken, JP), Tanaka; Tsunefumi (Kanagawa-ken, JP), Kurihashi; Toshiya (Tokyo, JP), Ogura; Shigeo (Tokyo, JP), Araki; Keisuke (Kanagawa-ken, JP), Sekita; Makoto (Kanagawa-ken, JP), Takeda; Nobuhiro (Kanagawa-ken, JP), Uchino; Yoshihiro (Fukuoka-ken, JP), Yanai; Toshikazu (Kanagawa-ken, JP), Nanba; Norihiro (Kanagawa-ken, JP), Saruwatari; Hiroshi (Kanagawa-ken, JP), Akiyama; Takeshi (Kanagawa-ken, JP)

Assignee: Canon Kabushiki Kaisha

International Classification: G02B 17/08 (20060101); H04N 5/225 (20060101); G02B 017/00 ()

Expiration Date: 12/26/2017