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:
Oct. 20, 2015
Filed:
Oct. 25, 2013
Canon Kabushiki Kaisha, Tokyo, JP;
Kazuhiro Inoko, Utsunomiya, JP;
CANON KABUSHIKI KAISHA, , JP;
Abstract
An illumination optical system is configured to illuminate an optical modulator configured to modulate incident light and includes a condenser lens system that includes a meniscus lens with a concave on a light source side, and condenses light from a light source; and a spherical aberration corrector disposed on an optical modulator side of the condenser lens system. The illumination optical system satisfies:0.6<||<1.40.9<sin θ≦1.0where f is a focal length of the condenser lens system, L is a length from an object-side principal point of the condenser lens system to the light source, and θ is half an angle at which the condenser lens system takes in the light from the light source.