Victor Company of Japan, Limited

Jvc Victor Company of Japan, Ltd.

Masahiko Sugiyama

Masaru Segawa

Yoichiro Nakatani

Naoto Hirohata

Shigehiro Masuji

Nobuyoshi Yamagishi

A microlens array sheet includes a light-shielding base having a first surface and a second surface opposite to the first surface and a microlens array attached to the first surface of the light-shielding base, the array having a plurality of microlens. The light-shielding base has a plurality of apertures that correspond to the microlenses. Each aperture has a conical trapezoid-like shape in which a size of each aperture on the first surface side is larger than another size of each aperture on the second surface side. Instead of the light-shielding base, the microlens array sheet may include a transparent base having a first surface and a second surface opposite to the first surface and a light-shielding layer, having a third surface and a fourth surface opposite to the third surface, provided on the second surface of the transparent base. The microlens array is attached to the first surface of the transparent base. The light-shielding layer has a plurality of apertures that correspond to the microlenses. Each aperture has a conical trapezoid-like shape in which a size of each aperture on the third surface side is larger than another size of each aperture on the fourth surface side.

Microlens array sheet and method of producing the same

An optical unit for use in a backlight device of a liquid crystal display apparatus, has a first light-collecting and -diffusing optical component, a light-collecting optical component, and a second light-collecting and -diffusing optical component, provided in this order on the optical path of light emitted from a light source. Each light-collecting and -diffusing optical component has a surface provided on which are a plurality of microlenses each having a shape of a hemisphere- or semi-oval-like protrusion, with light collecting and diffusing functions. The light-collecting optical component has a surface provided on which are a plurality of prisms each having a saw-teeth like section, with a light collecting function. Each surface is provided on a light-emitting side of the optical unit.

Optical unit, backlight device, liquid crystal module and liquid crystal display apparatus

The micro-lens array in which a plural of convexly-protruded micro-lens are closely arranged two-dimensionally and a plural of convex sub-lenses having a curvature-radius smaller than that of the micro-lens are protrusively formed on the surface of each micro-lens has a large view angle, since D/D is in a range from 0.1 to 0.3 where D is the micro-lens bottom face width obtained by halving the summation of the maximum and the minimum width which are measured along the line passing through the center of the bottom face of the micro-lens; Dis the sub-lens bottom face width obtained by halving the summation of the maximum and the minimum width which are measured along the line passing through the center of the bottom face of the sub-lens; and Dis the average sub-lens bottom face width obtained by averaging a plural of the sub-lens bottom face widths D.

Micro lens array and a method of manufacturing a replication mold for the same

A thin film magnetic recording medium () is composed of an underlayer film (), which is constituted by a nonmagnetic metal oxide film and formed on a nonmagnetic substrate (), and a magnetic film () of Co system, which is formed on the underlayer film () through an oblique evaporation process, wherein each of the underlayer film and the magnetic film is laminated in order. Fine particles of the nonmagnetic metal oxide film grow isotropically in the underlayer film () constituted by the nonmagnetic metal oxide film and the underlayer film () is formed in a construction without having a clear grain boundary, which separates a aggregation of the fine particles.

Thin film magnetic recording medium

In a first forming process, by injecting a predetermined amount of oxygen gas, magnetic metal vapor is deposited as a nonmagnetic underlayer on a base film F wound on one film winding roll B while advancing the base film F in a reverse direction (second direction) toward another film winding roll A along a cooling can roll from a minimum incidence angle side to a maximum incidence angle side of an incidence angle controlling mask . In a second forming process, by injecting a extremely smaller amount of oxygen gas than in the first forming process, magnetic metal vapor is deposited as a magnetic layer over the nonmagnetic underlayer while advancing the base film deposited with the nonmagnetic underlayer wound on the other film winding roll A in a forward direction (first direction) toward the film winding roll B along the cooling can roll from the maximum incidence angle side to the minimum incidence angle side of the incidence angle controlling mask

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Yokohama, Japan

Masahiko Sugiyama