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. 26, 2005
Filed:
Jul. 12, 2001
Hisanori Kawakami, Suwa, JP;
Kogo Endo, Suwa, JP;
Hisanori Kawakami, Suwa, JP;
Kogo Endo, Suwa, JP;
Seiko Epson Corporation, , JP;
Abstract
A light source deviceA,B orC comprising a lensA,B orC which receives light from a light emitting devicesuch as LED. The lensA is a lens having the property that the directivity of exiting light in the Y direction is higher than the directivity in the X direction perpendicular to the Y direction. Namely, the light emitted from the light emitting deviceis condensed in a narrow angular range in the Y direction, and is scattered in a wide angular range in the X direction. When the light source deviceA is used as a light source of an illumination device of a liquid crystal device, the height direction of a light guide in which the dimension is small coincides with the Y direction, and the width direction of the light guide in which the dimension is large coincides with the X direction.