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. 23, 2006
Filed:
Apr. 11, 2002
Light guide plate with convex portions having low radius of curvature tips, or low surface roughness
Applicants:
Hisashi Tahara, Hiratsuka, JP;
Akimasa Kaneishi, Hiratsuka, JP;
Inventors:
Hisashi Tahara, Hiratsuka, JP;
Akimasa Kaneishi, Hiratsuka, JP;
Assignee:
Mitsubishi Engineering-Plastics Corp., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F21V 7/22 (2006.01);
U.S. Cl.
CPC ...
Abstract
A light guide plate made of a transparent resin includes a first main surface and a second main surface opposite to the first main surface. The first main surface has a surface portion provided with convex portions having a height in the range of 5×10m to 6×10m each and a pitch in the range of 5×10m to 4×10m. The light guide plate having tip portions of at least 80% of the total convex portions with a radius of curvature of 2×10m or less, or the surface of the convex portions having a surface roughness of 3×10m or less.