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:
Dec. 13, 2010
Filed:
Jun. 23, 2005
Tsuyoshi Ishikawa, Tokyo, JP;
Hiroshi Yamazaki, Saitama, JP;
Tsuyoshi Ishikawa, Tokyo, JP;
Hiroshi Yamazaki, Saitama, JP;
Enplas Corporation, Saitama, JP;
Abstract
There is provided a very thin light guide plate for a surface light source device and a method of manufacturing it without the use of high-precision molding machine. A surface light source device using this light guide plate generates outgoing light having high uniformity. According to the manufacturing method, a light guide plate free from a weld line or warp can be manufactured with good transferring characteristics. The light guide plate is thick on an incident surfaceside and thin on a lower surfaceside. At the central portion of an incident surfacein a longitudinal direction, a projecting portion obtained by cutting an overhang portionat a position a distance D apart from the incident surfaceis formed. The cut surface of the projecting portion is not made specular and is kept rough. In molding of the light guide plate, a molten material is supplied from the position of a gate markAfter molding, the overhang portionis cut off by an ordinary cutter, thereby obtaining a light guide plate.