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. 07, 2009
Filed:
Jul. 30, 2004
Tetsuo Nagata, Hachioji, JP;
Tomoko Sato, Hachioji, JP;
Akihiro Sakurai, Hino, JP;
Tetsuya Ishii, Hachioji, JP;
Takeshi Takahashi, Hachioji, JP;
Kazuhiro Matsumoto, Hachioji, JP;
Tetsuo Nagata, Hachioji, JP;
Tomoko Sato, Hachioji, JP;
Akihiro Sakurai, Hino, JP;
Tetsuya Ishii, Hachioji, JP;
Takeshi Takahashi, Hachioji, JP;
Kazuhiro Matsumoto, Hachioji, JP;
Olympus Corporation, Tokyo, JP;
Abstract
An image pickup optical system includes, in order from the object side, a front unit having at least one reflecting surface with power that is rotationally asymmetrical, an aperture stop, and a rear unit having at least one reflecting surface with power that is rotationally asymmetrical. In this case, F-numbers in two directions perpendicular to each other on a plane perpendicular to the optical axis are different. Decentration takes place in one of the two directions and the F-number in a direction perpendicular to a decentering direction is smaller than that in the decentering direction. When the F-number in the decentering direction is represented by FNY and the F-number in the direction perpendicular to the decentering direction is represented by FNX, the optical system satisfies the following condition:1.1<<2.0.