Kuraray Co., Ltd.

Yoichi Hashimoto

Katsuya Fujisawa

Ikuo Onishi

Shinji Hiramatsu

Isao Hamashima

A planar light source device includes a light source , a reflector shade , a light guide member having at least one side face positioned adjacent the light source for receiving light from the light source and reflected by the reflector shade, and a light output plate positioned adjacent the light guide member with a first surface positioned adjacent a light exit surface of the light guide member . The first surface is formed with a multiplicity of projections having respective tips held in tight contact with the light exit surface of the light guide member , at least a portion of each of the projections having a curved facet. Of a function descriptive of a sectional shape of each of the projections that is parallel to a direction of travel of light and also a direction normal to the light output plate , the maximum value of the absolute value of a linear differential of a portion representative of a facet counter to the light source is chosen to be within the range of to

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Hiroshima, Japan

Yoichi Hashimoto