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. 10, 2012
Filed:
Dec. 09, 2008
Kanjo Orino, Tokyo, JP;
Kanjo Orino, Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An illumination optical system for illuminating an object surface using light from a light source, the illumination optical system includes, a first optical system that includes a movable unit that is movable along an optical axis, said first optical system guiding the light to the object surface and varying an irradiation area on a certain plane, and a second optical system that can be located on and removed from an optical path of said first optical system, the second optical system varies, when located on the optical path of said first optical system, the irradiation area on the certain plane in cooperation with said first optical system, while maintaining a shape of a light intensity distribution on the certain plane, relative to the irradiation area irradiated only by said first optical system.