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. 08, 2008
Filed:
Aug. 02, 2005
Takashi Kato, Utsunomiya, JP;
Chiaki Terasawa, Tochigi-ken, JP;
Hirohiko Shinonaga, Utsunomiya, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A catadioptric projection optical for forming an image of the intermediate image onto a second object, the catadioptric projection optical system include, a first dioptric group including a first lens group that has a positive refractive power and a second lens group that has a positive refractive power, a catadioptric group including a concave mirror and a third lens group that an incidence light and reflected light from the concave mirror pass, and a second dioptric group. A first deflective reflector is arranged between the first lens group and the second lens group. A second deflective reflector is arranged between the second lens group and the third lens group or between the third lens group and the second dioptric group. A first intermediate image is formed between the second lens group and the concave mirror. A second intermediate image is formed between the concave mirror and the second dioptric group.