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:
May. 15, 2007
Filed:
Sep. 07, 2004
Hidemasa Yamakawa, Azasagawa-mura, JP;
Hidemasa Yamakawa, Azasagawa-mura, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
Exemplary embodiments of the present invention provide a lighting unit including a lamp device adjusted by a general-purpose measuring device at high working efficiency, and yet allowing efficient utilization of light from a light source. In a light source device, since a first fly's eye has a concave entrance surface having a predetermined curvature, luminous flux entering the first fly's eye optical system and passing through the entrance surface is collimated to be parallel with an optical axis. Accordingly, illumination lights entering respective liquid crystal light valves are precisely superposed while allowing the angles of incidence of respective partial luminous fluxes entering the respective liquid crystal light valves to fall within a predetermined angle range, thereby enhancing utilization efficiency of the illumination lights.