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:
Feb. 17, 2004
Filed:
Jul. 24, 2001
Yoshihiro Katsu, Kanagawa-ken, JP;
Masaki Ohshima, Kanagawa-ken, JP;
Masaru Suzuki, Kanagawa-ken, JP;
Yoji Oki, Tokyo, JP;
Yasuyuki Daigo, Tokyo, JP;
Other;
Abstract
A plane light source apparatus having a lamp as light source and a light guide plate for directing and emitting the light from the lamp, wherein said light guide has a light incident surface opposed to said lamp and where the light from the lamp enters, a light emitting surface for emitting light from the lamp, and an opposed surface opposed to the light emitting surface, said light emitting surface or said opposed surface extends in the direction opposed to said light incident surface, has a plurality of convexoconcave portions formed to collect substantially light propagating in said light guide plate, and said convexoconcave portions have a flat face formed at the bottom of the concave portion or at the top face of the convex portion.