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. 18, 2012
Filed:
Aug. 24, 2009
Reona Ushigome, Utsunomiya, JP;
Kazuhiko Momoki, Koshigaya, JP;
Reona Ushigome, Utsunomiya, JP;
Kazuhiko Momoki, Koshigaya, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An image projection apparatus includes light sourcestoemitting at least two colored lights whose wavelengths are different from each other, a polarization conversion elementcontrolling a polarization direction of the colored light, at least two light modulation elementsandmodulating incident light, a light guide optical systemguiding the at least two colored lights from the polarization conversion element to the at least two light modulation elements in accordance with the polarization direction, and a projection optical system. One of the at least two colored light and the other are emitted as lights whose polarization directions are different from each other from the polarization conversion element. A drive unitturns on the light sources so that the one of the colored lights and at least one of the other enter the at least two light modulation elements at the same time.