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:
Feb. 26, 2013
Filed:
Mar. 23, 2011
Takafumi Kokusho, Tokyo, JP;
Takafumi Kokusho, Tokyo, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
A planar light source device including: a point light source; and a light guide plate, wherein the light guide plate includes: an emitting surface; an opposite emitting surface; and a side surface that connects the emitting surface and the opposite emitting surface; wherein the point light source is arranged adjacent to the side surface of the light guide plate, wherein the light guide plate has a cylindrical hole that is formed at a position, which corresponds to the position where the point light source is arranged, and wherein the hole forms an opening at the side surface to emit a portion of the light to the outside of the light guide plate, the portion of the light is emitted by the point light source and the portion of the light being a portion that was not totally reflected at the side surface.