Patent ID: 8368842

Claim:
A surface light source device, comprising: a light guide having a first surface and a second surface and at least one third surface, the light guide including a transparent resin and formed as a flat plate, the at least one third surface being substantially perpendicular to both the first surface and the second surface which are substantially parallel with respect to each other; a light source located adjacent the at least one third surface of the light guide; a reflecting sheet having a first surface and a second surface and an end, the first surface of the reflecting sheet located adjacent the second surface of the light guide; and a transparent sheet having a first surface and a second surface and a light incoming surface, the transparent sheet including a transparent resin, the first surface of the transparent sheet including the light incoming surface on the first surface and located adjacent the second surface of the reflecting sheet, the light incoming surface having an end surface located adjacent the end of the reflecting sheet, the light incoming surface facing the second surface of the light guide without interruption by the reflecting sheet such that light can pass from the second surface of the light guide to the light incoming surface of the transparent sheet, and the end surface of the light incoming surface being located toward the light source.