Patent ID: 7188990
Filing Date: 2007-03-13
Classification: G02B

Abstract:
1. A planar light source device comprising: a light guide having a light entrance surface through which light enters, and a light exit surface, from which the light that entered through the light entrance surface exits; a light source disposed along the light entrance surface of the light guide; and a reflecting body, which has two ends forming an opening to discharge the light emitted from the light source and sandwiching the light guide in a thickness direction, surrounds the light source, and reflects the light emitted from the light source toward the light entrance surface of the light guide, wherein: the light exit surface of the light guide has a grained surface region where a convex dot pattern is formed and a positioning region where no dot pattern is formed; and one of the two ends of the reflecting body, which is brought into contact with the light exit surface, has an edge that is positioned in the positioning region.