Patent ID: 7507011
Filing Date: 2009-03-24
Classification: G02B

Abstract:
1. A surface light source equipment comprising: a point light source; and a light conductive plate having a light outgoing surface from which a light introduced from the light source outgoes, the light conductive plate being configured so that the outgoing light is spread across substantially the entire surface of the light outgoing surface, and a plurality of patterns for reflection of a light conducted in the light conductive plate is formed on an opposite surface to the light outgoing surface of the light conductive plate, wherein the respective patterns are structured such that, as viewed from a direction perpendicular to the light outgoing surface, a light is incident from a substantially fixed direction determined for every pattern, and each of the patterns has an inclined surface on a light incident side, the inclined surface characterized in that, as viewed from the direction perpendicular to the light outgoing surface, the inclined surface is trapezoidal in shape, and an edge of the inclined surface positioned farther from the light source has a smaller width than an edge positioned closer to the light source, and the inclined surface substantially wholly shields both side surfaces of the pattern as viewed from a direction of light incidence.