Dai-ichi Seiko Co., Ltd.

Other

Enplas Corporation

Nobuhisa Noguchi

Hideaki Katoh

Teruo Hoshi

Isamu Kaneko

Yutaka Kikuchi

Seiki Kitahara

Shuichi Satoh

Minoru Suzuki

Tsuyoshi Ishikawa

Toshiaki Sugimoto

Jun Tamaki

A light control member formed by a prism sheet is arranged along an emitting surface of a light guide plate of a side light type surface light source device for liquid-crystal display backlighting arrangement and the like. The prism sheet is provided with numerous projections formed with a height H at a pitch D Roughness is imparted to the emitting surface by matt-processing or adhesion of fine particles. The roughness is preferably within the arithmetic average roughness Ra range 0.02-0.25 &mgr;m. Non-uniformity may be applied to height H of the prism sheet The tendency of the prism sheet to adhere to the emitting surface is reduced and degradation of light quality prevented by the roughness of the emitting surface and/or non-uniform height of projections on the prism sheet.

Side light type surface light source device

A light control member formed by a prism sheet is arranged along an emitting surface of a light guide plate of a side light type surface light source device for liquid-crystal display backlighting arrangement and the like. The prism sheet is provided with numerous projections formed with a height H at a pitch W D . Roughness is imparted to the emitting surface by matt-processing or adhesion of fine particles. The roughness is preferably within the arithmetic average roughness Ra range 0.02-0.25 &mgr;m. Non-uniformity may be applied to height H of the prism sheet . The tendency of the prism sheet to adhere to the emitting surface is reduced and degradation of light quality prevented by the roughness of the emitting surface and/or non-uniform height of projections on the prism sheet.

Surface light source device of side light type

A thin illumination device providing uniform luminance distribution on the diffusing plate comprising a reflecting plate, linear light sources arranged in the vicinity of the reflecting plate and a diffusing plate arranged on the opposite side of the reflecting plate with regard to the light sources, section of the reflecting plate having a shape of continuous curves having different curvature.

Illumination device

Surface illuminant device

An illumination device having a reflecting plate, at least one linear light source arranged on a first side of the reflecting plate, a diffusing plate arranged on a second side of the reflecting plate, and a light quantity adjusting member formed integrally with the reflecting plate.

An illumination device comprising a reflecting plate, a single or a plural number of linear light source(s) arranged over said reflecting plate and a diffusing plate arranged over said light source(s), a light quantity adjusting means being arranged on the surface of the linear light source on between said light source(s) and said diffusing plate, and said illumination device being so adapted as to uniformalize luminance distribution on the diffusing plate by selecting shape and size of light-transmitting portions of the light quantity adjusting means.

Growing community of inventors

Saitama, Japan

Nobuhisa Noguchi