Showa Denko K.k.

Other

Showa Denko Kabushiki Kaisha

Takeo Watanabe

Hirotoshi Kamata

Shuichi Sugita

Shuichi Naijo

Shuji Gomi

Toshio Koshikawa

Kazuhiko Ooga

Tomio Yamamoto

Kazuo Ohtani

Hidetake Sendai

Kenji Shinozaki

Takashi Sato

Hirotaka Tagoshi

Koji Tokita

Toshihiko Kadota

A light guide member laminated on the upper face of a luminous device mounting substrate on which a luminous device is mounted and which is for diffusing and guiding upward light emitted from the luminous device. The light guide member includes a light reflecting portion formed on the bottom face of the light guide member in an area other than an area near the luminous device, and a section in which a light reflecting portion is not formed on the bottom face of the light guide member at a position near the luminous device. Also disclosed is a planar light source device provided with the light guide member, and a display apparatus using the planar light source device.

Light guide member, planar light source device provided with the light guide member, and display apparatus using the planar light source device

A light guide member capable of reducing an unevenness of luminescent color and further a nonuniformity in luminance when obtaining a white color by a color mixture using a plurality of light sources. Also disclosed are a flat light source device and a display device. A protrusion () of a cylindrical shape is formed upward a plurality color of LED light sourcesR,G,B, e.g., RGB color at a backside face of a light guide member (), and a conical depression () is disposed at the position directly over the protrusion. Lights of each color from LED light sourcesR,G,B are mixed at the protrusion (), thereafter reflect at the depression () and propagate in a horizontal direction at a light guide portion ().

Light guide member having light mixing protrusion, flat light source device, and display device

A light guide member in which a light that has entered one major face from an illuminant is emitted from the other major face, includes a cut portion provided with a specified face inclined toward the other face at a section of one major face that faces the illuminant, and a reflecting portion, which reflects a light emitted from the illuminant, on the inclined face.

Light guide member, planar light source device using the light guide member, and display apparatus

The present invention provides a resist ink composition comprising a compound (a) having at least one oxetanyl group and at least one epoxy group within the same molecule and a compound (b) capable of initiating cationic polymerization under irradiation by an active energy ray and/or under heat. This resist ink composition has high photosensitivity and enables the final curing by a brief heating and the cured film exhibits good physical properties.

Resist ink composition

A PC supplies previously compressed print data to a printer. In the printer, image data are generated based on the supplied print data, and the generated image data are developed in an image memory. Since the print data are compressed, a compressor/decompressor decompresses the print data. If available free area in the image memory is insufficient for developing the image data, the compressor/decompressor compresses the image data previously stored in the image memory, and the image memory is refreshed with the compressed image data. The compressed image data are decompressed by the compressor/decompressor before output to a printer engine. The compressor/decompressor is available for decompressing the print data during a period since the data reception from the PC until a sheet of paper onto which an image is formed reaches a predetermined position. When the sheet of the paper reaches the predetermined position, the compressor/decompressor is switched to decompress only the image data in the image memory.

Image forming apparatus having data compression/decompression system

Photocurable composition

Photocurable prepreg sheet for waterproofing, method and apparatus for production of prepreg sheet, and waterproofing method using the sheet

A photocurable prepreg composition which is characterized by easy control of a B stage state of a thermosetting resin such as an unsaturated polyester resin or an epoxy acrylate resin, excellent storage stability, and remarkable curability after being shaped; as well as a production method therefor. A photocurable prepreg composition which contains an unsaturated polyester resin and/or an epoxy acrylate resin; at least two photopolymerization initiators with photosensitivity in different wavelength ranges; and an inorganic or an organic fiber-reinforcing material and/or filler, and which composition is treated with light of a specific wavelength such that at least one photopolymerization initiator and radical-polymerizable unsaturated groups remain partially in said resin; a production method therefor; and formed articles produced therefrom.

Photocurable prepreg composition and production method thereof

Color reversion of photocured products which have been photocured with cationic dyes and quaternary organo borates can be notably suppressed by addition of phenolic compounds, aromatic thiol compounds, amine compounds and/or phosphorous compounds.

Photocurable composition and color reversion preventing method

A photocurable composition comprising an ultraviolet radical polymerization initiator, a cationic dye with absorptions in the visible light region, a quaternary boron salt and optionally a polymerization accelerator, is irradiated with ultraviolet light and visible light either simultaneously or separately, to achieve adequate hardening in air of both the surface and the interior of the cured product, and to provide a cured product with an excellent appearance and without production of coloring substances derived from the polymerization initiator.

Growing community of inventors

Chiba, Japan

Takeo Watanabe