Patent ID: 8092066
Filing Date: 2012-01-10
Classification: G02B,Y10S

Abstract:
1. A surface light source device that combines a light emitting element and a light guide plate to form a light emitting element/light guide plate unit, and that combines a plurality of light emitting element/light guide plate units to emit planar light of a rectangular shape, wherein: the light guide plate comprises: the extended area and the incidence surface area have symmetrical shapes with respect to one of diagonal lines of the light emitting area and an extending line of the one diagonal line; one of the plurality of light emitting element/light guide plate units is combined with another light emitting element/light guide plate unit by: a reflective sheet is arranged on a substantially entire area of at least the back surface side of the light emitting area of the first light guide plate, and, in a position where the first light guide plate and the second light guide plate overlap, is arranged between a back surface side of the first light guide plate and a surface side of the second light guide plate.