Dai Nippon Printing Co., Ltd.

Yuki Katsura

Masahiro Goto

Kazunobu Ogawa

Futoshi Osawa

Masashi Miyashita

An optical film according to an embodiment includes a substrate, a surface memberprovided on a front surface of the substrate, and an optical functional layerprovided on a back surface of the substrate. The optical functional layerincludes a low-refractive index layerand a high-refractive index layer, and an interface between the low-refractive index layerand the high-refractive index layerhas a recessed/protruding shape. The refractive index of the high-refractive index layer, the refractive index of the substrate, and the refractive index of the surface memberbecome smaller in this order.

Optical film, optical-film-equipped polarizing plate, and display device

A lenticular lens comprises multiple convex unit lenses, two sides of each unit lens being curved surfaces gradually spreading outwardly from the upside (plane of emergence) to the base (plane of incidence) of the unit lens, and these unit lenses are disposed on a base film in parallel with each other. The acute angle &#x3b8; between a tangent to two curves corresponding to the two sides of the unit lens on its section vertical to the longer direction and a line parallel to the upside (or the base) of the unit lens is in a range represented by the following inequality:139()&#x2212;176()+78()+74.4 &#x3e;&#x3b8;&#x3e;346()&#x2212;469()+219()+45.0where d is the length of half of the distance between the two curves, and p is the pitch at which the unit lenses are disposed.

Lenticular lens, light-diffusing sheet, and projection screen

In a diffusion sheet, a plurality of approximately trapezoidal columnar unit lens portions are disposed such that the long-axis directions thereof are in parallel with each other, and all the surfaces of the unit lens portions, which correspond to the long bottom segments of the approximately trapezoidal sections of the unit lens portions are disposed on a light-incident-side flat surface. Further, light absorbing portions are disposed in the grooves between adjacent unit lens portions to absorb and/or shield external light incident from a light outgoing side. In the diffusion sheet arranged as described above, light incident on the unit lens portions from a light incident side is totally reflected on the surfaces corresponding to the side segments of the approximately trapezoidal sections vertical to the long-axis direction of the unit lens portions and outgoes from the light outgoing side.

Diffusion sheet, rear projection screen provided with diffusion sheet, method of manufacturing mold for diffusion sheet, and method of manufacturing diffusion sheet

In a diffusion sheet, a plurality of approximately trapezoidal columnar unit lens portionsare disposed such that the long-axis directions thereof are in parallel with each other, and all the surfaces of the unit lens portions, which correspond to the long bottom segmentsof the approximately trapezoidal sections of the unit lens portionsare disposed on a light-incident-side flat surface. Further, light absorbing portionsare disposed in the grooves betweenadjacent unit lens portionsto absorb and/or shield external light incident from a light outgoing side. In the diffusion sheetarranged as described above, light incident on the unit lens portionsfrom a light incident side is totally reflected on the surfaces corresponding to the side segmentsof the approximately trapezoidal sections vertical to the long-axis direction of the unit lens portions and outgoes from the light outgoing side.

In a diffusion sheet, a plurality of approximately trapezoidal columnar unit lens portionsare disposed such that the long-axis directions thereof are in parallel with each other, and all the surfaces of the unit lens portions, which correspond to the long bottom segmentsof the approximately trapezoidal sections of the unit lens portionsare disposed on a light-incident-side flat surface. Further, light absorbing portionsare disposed in the grooves between adjacent unit lens portionsto absorb and/or shield external light incident from a light outgoing side. In the diffusion sheetarranged as described above, light incident on the unit lens portionsfrom a light incident side is totally reflected on the surfaces corresponding to the side segmentsof the approximately trapezoidal sections vertical to the long-axis direction of the unit lens portions and outgoes from the light outgoing side. In each of the unit lens portionsarranged as described above, the distance h between both the bottom segmentsandof the approximately trapezoidal section is 120% or more to 400% or less of the length p of the long bottom segment(h/p=1.20 to 4.00).

Growing community of inventors

Tokyo-to, Japan

Yuki Katsura