Patent ID: 7371000

Claim:
A surface light source equipment comprising: a light conductive plate, by which a light introduced from a light incident surface is spread on a substantially whole light outgoing surface to outgo outside from the light outgoing surface, and a light source arranged opposite the light incident surface of the light conductive plate and being small as compared with a width of the light conductive plate, wherein a plurality of recesses are arranged as first diffusion patterns in a region on the light incident surface, the first diffusion patterns face the light source, each of the first diffusion patterns comprises: a first surface configured to refract light in a first direction substantially in a direction of a normal line to the light incident surface, a second surface configured to refract light in a second direction directed toward a corner close to the light incident surface of the light conductive plate, and a third surface configured to refract light in a third direction between the first direction and the second direction, a pitch between the first diffusion patterns is smaller than a width of the light source, and the light conductive plate further comprises a second diffusion pattern, in the form of a V-groove, a V-shaped projection, or an arc, formed on the light incident surface between the first diffusion patterns.