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:
Jul. 13, 2010
Filed:
Jun. 26, 2008
Hirofumi Ohta, Tsukuba, JP;
Gihwan Ahn, Cheongju-si, KR;
Byoungin Kim, Seoul, KR;
Sumitomo Chemical Company, Limited, Tokyo, JP;
Abstract
A light control plateA of the present invention is disposed in front of a surface light sourcethat emits, in a predetermined direction, parallel light Fhaving a substantially uniform luminance distribution. The light control plateA has a light incidence surface, at which there are provided optical path control sectionsA of concave and/or convex cross-sectional shape, and a planar light exit surface. The surface of the optical path control sectionsA comprises first to M-th planar portionsAtoA. The inclination angles αto αand pitch ratios Lto Lof each planer portion are specified in such a manner that the parallel light Fcan be spread within an exit angle range −θto θrelative to the predetermined direction, to exit as light having a substantially uniform luminance angular distribution within the exit angle range. Thereby, parallel light having a uniform luminance distribution can be spread within a predetermined angle range, to exit as light having a substantially uniform luminance angular distribution within the angle range.