Stanley Electric Co., Ltd

Kazumi Chijiwa

Yoji Oki

Atsushi Kurita

Takeshi Asakura

To provide a light guide plate with reduced luminance unevenness. The light guide plate includes: a base portion having a one surface and a light incident surface disposed on one end side of the one surface and intersecting the one surface, and a plurality of convex lenses provided on a side facing the one surface of the base portion, each of the plurality of convex lenses extending in a first direction and aligned along a second direction which is substantially orthogonal to the first direction, where the base portion includes at least a first region relatively close to the light incident surface and a second region relatively far from the light incident surface, and where the first region is provided with a plurality of first bottom portions that are surfaces disposed between the convex lenses adjacent to each other in the second direction and inclined with respect to the first direction.

Light guide plate, lighting apparatus, and display apparatus

A surface light source devicecomprises light sourcesanda light guide plateand a prism sheetA plurality of ridgesare formed on the incident surface of the prism sheetEach ridgeincludes first and second inclined surfacesandwhose inclination angles with respect to a normal lineare Aand Arespectively, provided that 35.5&#xb0;&#x2264;A1&#x2264;39&#xb0; and 23&#xb0;&#x2264;A2&#x2264;30&#xb0;.

Surface light source device and prism sheet

In a light guide plate having a light incident surface, a light distributing control surface perpendicular to the light incident surface and a light emitting surface opposing the light distributing control surface, a flat mirror-finish portion is provided on a first area of the light distributing control surface, and a prism sequence is provided on a second area of the light distributing control surface where the flat mirror-finish portion is not provided. The prism sequence is protruded with respect to the flat mirror-finish portion. Each prism of the prism sequence has a rising sloped surface opposing the light incident surface, a first falling sloped surface connected to the rising sloped surface, and a second falling sloped surface connected to the first falling sloped surface, A slope of the first falling sloped surface is larger than a slope of the second falling sloped surface.

Growing community of inventors

Tokyo, Japan

Kazumi Chijiwa