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:
Jan. 10, 2006
Filed:
Jul. 30, 2003
Yoshiaki Kurioka, Tokyo, JP;
Katsumi Kurematsu, Tokyo, JP;
Takayuki Ishii, Tokyo, JP;
Toshihiro Sunaga, Tokyo, JP;
Sawako Chatani, Port Washington, NY (US);
Yoshiaki Kurioka, Tokyo, JP;
Katsumi Kurematsu, Tokyo, JP;
Takayuki Ishii, Tokyo, JP;
Toshihiro Sunaga, Tokyo, JP;
Sawako Chatani, Port Washington, NY (US);
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A projection optical system which can project a bright image with less distortion and a small projection distance without causing aberration or an increase in size of reflective surfaces is disclosed. The projection optical system projects luminous flux from an original image onto a projection surface which is oblique to a central principal ray which is a principal ray of luminous flux traveling from the center of the original image to the center of a projected image. The projection optical system comprises a refractive optical system which includes a plurality of refractive optical elements through which the luminous flux from the original image passes through, and a reflective optical system which includes a plurality of reflective surfaces each having an optical power and guides the luminous flux emerging from the refractive optical system to the projection surface.