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. 04, 2010
Filed:
Jan. 12, 2005
Seiji Sakai, Kikuchi-gun, JP;
Takuya Sakamoto, Kikuchi-gun, JP;
Toshiyuki Yoneda, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Chiyoda-ku, Tokyo, JP;
Abstract
A primary object of the present invention is to provide a surface light source device attaining a homogenous luminance distribution on a light emitting surface of a light guiding plate in which a dot light source having a high directivity of emitted light is employed. The device includes: a light guiding plateincluding a plurality of primary holes in such a manner as to locate each dot light sourceinside; and dot printingbeing employed as an auxiliary light source means which diffuses light from the dot light sourceto the position between dot light sourcesbeing adjacent to each other, wherein the dot printingis provided at a base of the light guiding plateand a middle point of the connected dot light sourcesbeing adjacent to each other.