Opto Design, Inc.

Rihito Sato

Eiichi Sato

Hiroyasu Sato

Kenji Fukuoka

To provide a planar light source device that can provide large-area, uniform, and high-quality planar illumination light. A planar light source device includes a main body casethat surrounds the periphery of a gap between a pair of optical reflection plates disposed to face each other with side plates, and a plurality of point light sourcesarranged at predetermined intervals on at least one side plate of the main body case. The planar light source device allows light from the point light sourcesto be transmitted through at least one of the pair of optical reflection platesand emitted to the outside. At least oneof the pair of optical reflection platesincludes a light blocking region Sthat blocks light from the point light sources on the point light sourcesside, and a light transmission region Sthat does not allow the light from the point light sourcesto be directly transmitted but allows reflection light reflected between the optical reflection plates to be transmitted, and is aligned so that transmissivity increases as the distance from the light blocking region Sincreases, and luminance is substantially uniform on the surface of the optical reflection plate.

Planar light source device and illumination apparatus

[Purpose] To provide a surface illumination fixture using a point light source having strong directivity. [Constitution] In the surface illumination fixtureincluding a surface illumination light-source deviceconverting light from a plurality of point light sourceshaving strong directivity into surface illumination and an illumination fixture main body, the surface illumination light-source deviceincludes a casinghaving a flat plate partbeing used to attach the surface illumination light-source device to the illumination fixture main body, lateral plate parts standing from the flat plate part, and an opening on a surface opposite to the flat plate part, and includes a light-guide reflection plate covering the opening. The flat plate part, the lateral plate partsand, and the light-guide reflection plateare formed by members having a high light reflectance and a low light transmittance. The light-guide reflection plateis formed to have a lower light reflectance and a higher light transmittance as the distance from the corresponding point light source increases. The illumination fixture main bodyhaving attaching means for attachment to a ceiling or a wall.

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Hachioji, Japan

Rihito Sato