Nitto-denko Corporation

Junichi Fujisawa

Yuichi Tsujita

Kazunori Mune

Tomoyuki Hirayama

Masayuki Satake

Takami Hikita

Yutaka Ohmori

Shigenori Morita

Masakatsu Urairi

Tetsurou Ikeda

Reiko Akari

Chieko Kitaura

Shigeki Kawabe

Akinobu Souma

Yusuke Shimizu

Tokuhisa Kosaka

Masahiko Watanabe

Ohmori Yutaka

An infrared-ray reflective film () of the present invention is configured by disposing an infrared reflective layer () and a transparent protective layer () on a transparent film backing () in this order. The infrared reflective layer () comprises: a first metal oxide layer (); a metal layer () made of a silver alloy containing silver in an amount of 96 to 99.9 weight %; and a second metal oxide layer (), which are arranged in this order from the side of the transparent film backing (), wherein each of the first metal oxide layer () and the second metal oxide layer () is in direct contact with the metal layer (). There is no metal layer between the transparent film backing () and the infrared reflective layer () and between the infrared reflective layer () and the transparent protective layer (). Preferably, the infrared-ray reflective film of the present invention has a visible ray transmittance of 65% or more, a shading coefficient of less than 0.60, and a corrected emissivity as measured from the side of the transparent protective layer of 0.20 or less.

Infrared-ray reflective film

Provided is a visible light-transmissive and infrared-reflective substrate, including: a visible light-transmissive substrate layer disposed so as to serve as a partition between inside and outside of a room; and an infrared-reflective layer laminated on a surface on the room side of the visible light-transmissive substrate layer, wherein the visible light-transmissive substrate layer has a solar absorbance of at least 30%, the infrared-reflective layer includes a reflective layer configured to reflect infrared rays and a protective layer laminated on a surface on the room side of the reflective layer, and normal emissivity of a surface on the protective layer side of the infrared-reflective layer is not more than 0.50.

Visible light-transmissive and infrared-reflective substrate

An adhesive of the invention is used for polarizing plate to provide a transparent protective film on at least one side of a polarizer and comprises a resin solution comprising a polyvinyl alcohol-based resin, a crosslinking agent and a colloidal metal compound with an average particle size of 1 nm to 100 nm, wherein 200 parts by weight or less of the colloidal metal compound is added to 100 parts by weight of the polyvinyl alcohol-based resin. The adhesive for polarizing plate can reduce the occurrence of knicks.

Adhesive for polarizing plate, polarizing plate, manufacturing method therefor, optical film and image display

An optical connection structure which permits easy and automatic alignment between the optical axes of optical fibers and the optical axes of cores of an optical waveguide, and a production method which ensures that an optical waveguide for the optical connection structure can be efficiently produced with higher dimensional accuracy are provided. An over-cladding layer of the optical waveguide includes an extension portion provided in a longitudinal end portion thereof, and optical fiber fixing grooves are provided in the extension portion as extending along extension lines of cores coaxially with the cores and each having opposite ends, one of which is open in an end face of the extension portion and the other of which is closed. Optical fibers are fitted and fixed in the respective optical fiber fixing grooves. The over-cladding layer further includes a boundary portion () provided between the other closed ends of the optical fiber fixing grooves and the cores.

Optical connection structure and production method of optical waveguide to be used for the optical connection structure

A resin composition for an optical waveguide is provided, which has excellent adhesiveness to a cladding layer of the optical waveguide and excellent patternability for formation of a core portion of the optical waveguide and reduces the optical waveguide loss. An optical waveguide produced by using the resin composition is also provided. The resin composition comprises: (A) a multifunctional partially-acrylated epoxy resin, as a major component, having an epoxy group and a (meth)acrylate group in the same main chain thereof; and (B) a photopolymerization initiator as a curing component. The optical waveguide includes: a substrate; a cladding layer provided on the substrate; and a core portion provided on the cladding layer for transmission of an optical signal; wherein the core portion is formed from the resin composition.

Optical waveguide using a resin composition and production method of the optical waveguide

A resin composition for an optical waveguide is provided, which permits easy formation of a core pattern using an alkali developing liquid and suppresses degradation of the alkali developing liquid. An optical waveguide produced by using the resin composition is provided. The resin composition comprises: (A) an alkali soluble resin, as a major component, having a structural unit represented by formula (1): wherein R, Rand R, which may be the same or different, are each a hydrogen atom or a methyl group; Rand R, which may be the same or different, are each a hydrogen atom or a methyl group; Ris and m+n+p=1, m&#x3e;0, n&#x3e;0 and p&#x3e;0; and (B) a photopolymerization initiator. The optical waveguide includes a substrate, a cladding layer provided thereon, and a core portion provided in the cladding layer for transmitting an optical signal.

Resin composition for optical waveguide, and optical waveguide produced by using the resin composition

Disclosed is inexpensive optical waveguide for an optical connector which is accurately positioned across the width of cores when inserted in and fixed in an optical waveguide fixing through hole of a ferrule to provide low optical coupling loss when connected, an optical connector using the same, and a method of manufacturing the same. An optical waveguide for an optical connector includes cores, an under cladding layer, and an over cladding layer. The strip-shaped optical waveguide has a longitudinal end portion configured to be fixed in a predetermined through hole provided in a ferrule of an optical connector. The cores are formed on the under cladding layer by a photolithographic method. The over cladding layer is formed with respect to the positions of the cores or positioning alignment marks by a photolithographic method. The over cladding layer covers the cores, and the under cladding layer including crosswise end surfaces thereof.

Optical waveguide optical connector using same, and manufacturing method thereof

A manufacturing method of an optical waveguide device and an optical waveguide device obtained thereby. An under cladding layer is formed on the front surface of a colored-layer-coated PET substrate including a PET substrate portion and a colored layer of a color that absorbs irradiation light and formed on the back surface of the PET substrate portion, and then a photosensitive resin layer for the formation of cores is formed thereon. In forming the cores, when the irradiation light reaches the bottom surface of the PET substrate portion, most of the irradiation light is absorbed by the colored layer, so that there is little irradiation light reflected from the bottom surface of the PET substrate portion. This significantly reduces the irradiation light reflected diffusely from the PET substrate portion and reaching the photosensitive resin layer to thereby effectively suppress the surface roughening of the side surfaces of the cores.

Manufacturing method of optical waveguide device and optical waveguide device obtained thereby

A novel polyimide compound which has a low linear expansion coefficient and permits film formation by a spin coating method or the like, a preparation method for the polyimide compound, and an optical film and an optical waveguide produced by employing the compound. The polyimide compound has a structural unit represented by the following general formula (1): wherein X is a covalent single bond, &#x2014;CH&#x2014;, &#x2014;C(CF)&#x2014; or &#x2014;CR(R')&#x2014; (wherein R and R&#x2032;, which may be the same or different, are each a Cto Calkyl group or an aryl group); A and B, which may be the same or different, are substituents each selected from a hydroxyl group, a halogen group and a Cto Calkyl group; a and b, which are the numbers of the substituents A and B, respectively, are each an integer of 0 to 2; and o, p and q are each an integer of 1 to 5.

Polyimide compound, preparation method therefor, and optical film and optical waveguide produced by employing the compound

A production method of an optical waveguide for a connector is provided, which reduces an optical coupling loss. Cores are formed in a crossing pattern, a branched pattern or a linear pattern, and then an over-cladding layer formation photosensitive resin layer is formed over the cores. In turn, a heat treatment is performed at a temperature of 70&#xb0; C. to 130&#xb0; C. to properly form mixed layers in interfaces between the cores and the photosensitive resin layer. By thus forming the mixed layers, the connector optical waveguide can be produced as having a reduced optical coupling loss.

Production method of optical waveguide for connector

An optical waveguide device is provided which is capable of reducing light propagation losses in the cores of an optical waveguide when the optical waveguide is formed on a surface of a substrate, regardless of the type of substrate. A photosensitive resin layer (A) for over cladding layer formation is made of a photosensitive resin composition of a non-solvent type, and is heated prior to the exposure thereof to light. This causes interface portions between the cores () and the photosensitive resin layer (A) to be formed into mixed layers (). This reduces light propagation losses.

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Ibaraki, Japan

Junichi Fujisawa