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:
Dec. 29, 2015
Filed:
Feb. 13, 2013
Canon Kabushiki Kaisha, Tokyo, JP;
Kazuhiro Inoko, Utsunomiya, JP;
CANON KABUSHIKI KAISHA, , JP;
Abstract
The illumination optical system includes, as optical elements, a condenser lens system () to condense light from a light source (), a first fly-eye lens () and a second fly-eye lens (). The light source generates a light emitter having a finite longitudinal length in a first direction orthogonal to an optical axis direction of the illumination optical system. The light source and the optical elements are configured to form the light source images closer to the illumination surface than the second fly-eye lens. The light source and the optical elements are configured to satisfy a condition of P/P≦2.0. In the condition, Prepresents an array pitch of the light source images in the first direction, and Prepresents an array pitch of the light source images in a second direction orthogonal to the first and optical axis directions.