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:
Jul. 03, 2007
Filed:
Jun. 23, 2006
Applicants:
Chiaki Terasawa, Utsunomiya, JP;
Hiroyuki Ishii, Utsunomiya, JP;
Takashi Kato, Utsunomiya, JP;
Inventors:
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 3/00 (2006.01); G02B 9/00 (2006.01); G02B 17/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A catadioptric projection optical system includes a first optical system, for receiving light from an object, a second optical system, for forming an image of the object on an image plane, and a third optical system disposed optically between the first optical system and the second optical system. The first, second and third optical systems have a common straight optical axis. The image of the object is projected onto the image plane through a plurality of real intermediate image formations, and a pupil plane of the catadioptric projection optical system is free of a void area.