Patent ID: 6979113

Claim:
A surface light source device comprising: a light guide plate having a light emission surface and a reflection surface that are opposed to each other and end faces that connect the light emission surface and the reflection surface; a linear light source disposed along one of the end faces of the light guide plate; an optical sheet disposed on the light emission surface side of the light guide plate; a reflection sheet disposed on the reflection surface side of the light guide plate; a first frame including: a frame plate portion opposed to a periphery of the light emission surface of the light guide plate; an extension portion extending outward from the frame plate portion and opposed to the linear light source; and a frame flange portion bent from the extension portion and opposed to the linear light source and the one end face of the light guide plate; a second frame that is provided on the reflection surface side of the light guide plate and holds the light guide plate, the optical sheet, and the reflection sheet between itself and the first frame; and reflecting means formed on the extension portion and the frame flange portion of the first frame, for reflecting light coming from the linear light source toward the one end face of the light guide plate.