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:
Jun. 03, 2003
Filed:
Apr. 04, 2001
Masaru Suzuki, Kanagawa, JP;
Yoshihiro Katsu, Kanagawa-ken, JP;
International Business Machines Corporation, Armonk, NY (US);
Abstract
To provide a back light unit, a liquid display, and a method for manufacturing a light guide plate, in which the occurrence of bright lines can be diminished. An incoming surface of a transparent light guide plate is machined into a smooth surface S to correct a manufacturing tolerance during injection molding in order to form an edge portion E into a designed shape. To effectively reduce occurrence of bright lines, the edge portion E preferably has a curvature of radius or a chamfer dimension of 140 [&mgr;m] or smaller. The transparent light guide plate , a diffusion sheet , and a prism sheet configure a back light unit for a liquid crystal display.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile