Patent ID: 7641376

Claim:
A surface light source device comprising: a plurality of point light sources arranged at a predetermined spacing; a light guide plate having upper and lower surfaces and side surfaces, one of the side surfaces of the light guide plate serving as a light incident surface by which light emitted from the plurality of light sources reaches the upper surface to generate a surface light; a first reflective layer arranged at the lower surface of the light guide plate and near the point light sources; a casing that has an opening part at a position corresponding to the upper surface of the light guide plate, and that holds the point light sources and the light guide plate and the first reflective layer; and light introducing means for introducing the light emitted from the point light sources into the upper surface or the lower surface of the light guide plate, the light introducing means being disposed between the point light sources adjacent to each other, wherein the light introducing means has a second reflective layer arranged underneath the lower surface of the light guide plate below a space arranged above a horizontal extension portion of the first reflective layer that extends away from the light guide plate; and the first reflective layer includes a plurality of holes above the second reflective layer.