Patent ID: 7771100

Claim:
A surface light source apparatus comprising: a point light source comprising an LED disposed in a non-transparent case; a light guide plate which spreads light introduced from the point light source into a planar shape to output the light from a light outgoing plane; and a light blocking member which covers parts of the point light source and the light outgoing plane of the light guide plate, wherein a gap shielding member is projected toward the light outgoing plane from a surface on a side facing the light outgoing plane of the light blocking member, and at least a portion facing the light outgoing plane in the gap shielding member is made of a material having a light blocking and roughened surface property, wherein the gap shielding member has a first surface facing the light blocking member and a second surface facing the light guide plate, and the gap shielding member comprises an adhesive agent layer disposed only on the first surface, wherein a thickness of the gap shielding member is equal to a thickness of a face of the case facing the light guide plate on the mounting side, and the thickness of the face of the case facing the light guide plate on the mounting side is equal to a thickness of a gap between the light blocking member and the light outgoing plane.