Mitsubishi Gas Chemical Company, Inc.

Tomoegawa Paper Co., Inc.

Michio Ohba

Yasunari Kawabata

Kuniaki Jinnai

Toshihiko Takano

Hisashi Ohwada

Tetsuya Abe

Akitoshi Sugio

Toshikazu Umemura

Kensaku Higashi

Kazuyuki Ohya

Mutsuhiko Takeda

Masaharu Kimura

Chiharu Nishizawa

Akira Amemiya

Seiji Kita

Tomotaka Furusawa

Shizuo Togo

Katsumasa Tanaka

Muneo Ito

Takeo Suzumori

Kiyokazu Kawaguchi

Yoshiharu Ohtsuki

Takaaki Fukai

Hamaho Hashimoto

Toshihiro Takano

A flexible polymer optical waveguide device which is excellent in mechanical strength and durability against environments, particularly excellent in heat and chemical resistance, with maintaining characteristics of an optical waveguide and which can be easily produced, and a process for the production thereof, the flexible optical waveguide device having a structure in which a cured resin layer is formed on at least one surface of an optical waveguide film obtained by forming a refractive index distribution in a light-permeable polymer film, the cured resin layer(s) comprising a polyamide resin and at least one of an epoxy resin and a phenolic resin as main components.

Flexible optical waveguide device and process for the production thereof

An optical device which can be fabricated without any axial alignment by optical measurement and can therefore be produced at a remarkably decreased cost, and which is composed of an optical waveguide part (1) obtained by perpendicularly cutting an optically-transparent polymer film having a glass substrate attached thereto and having a refractive index distribution formed, in a predetermined position measured from the position of the refractive index distribution as a reference, and a holder part (2) for holding the optical waveguide part (1) in a predetermined position, the holder part (2) having a horizontal guide surface (2H) and a vertical guide surface (2V), the optical waveguide part (1) having a glass substrate surface or a polymer film surface coherently attached to the horizontal guide surface (2H) of the holder part (2), and the optical waveguide part (1) having a perpendicularly cut surface coherently attached to the vertical guide surface (2V) of the holder part (2).

Optical waveguide device for connections without optical axis adjustment

An optical waveguide module having a main-line waveguide, which is excellent in optical branching properties, important properties of a bus communication network, and the reproducibility of the above branching properties and is easy to produce, and an optical transmission equipment having the above optical waveguide module. The optical waveguide module having a main-line waveguide which is connected to the optical transmission path and works as part of the optical transmission path and a pair of branch waveguides (21,22) which are unidirectionally branched from the main-line waveguide, the main-line waveguide and the branch waveguides being formed by providing an optically transparent polymer film with a refractive index distribution, a light-receiving device (25) being connected to one (21) of a pair of the branch waveguides, a light-emitting device (26) being connected to the other (22).

Optical waveguide module having main-line waveguide and branch

An object of the present invention is to allow an optical element to be obtained with good precision using a polymer film and a glass substrate as a reinforcer. The present invention is characterized by the fact that a polymer film is formed on a glass substrate which has been treated to prevent the glass substrate and polymer from separation. This allows an optical circuit pattern to be formed without producing separation between the glass substrate and polymer film when the film is formed. The dimensional precision of the configuration of the distributed index in the polymer film can be maintained generally to the same extent as the expansion and shrinkage of the glass substrate. In addition, a vessel obtained with a glass substrate as the bottom surface can be used as the casting vessel.

Method for manufacturing optical element

The present invention provides a curved optical waveguide with reduced loss. Particularly, it relates to a waveguide with rectangular cross-section which has a curved portion, wherein the relation between the width D of the waveguide at the curved portion and the radius R of the curvature is R/D.ltoreq.500. This waveguide is provided with at least one cladding inside the core of said curved portion, thereby dividing the waveguide at the curved portion in a plurality of narrow optical waveguides. This enables a large reduction of the loss even in curved optical waveguides with sharp curves, and realizes inexpensive optical waveguides.

Curved optical waveguide and method of manufacturing the same

An optical fiber array, wherein a plurality of optical fibers are inserted between a pair of substrates consisting of a first substrate, wherein a parallel groove is formed at one end thereof for accommodating the ends of portions of a plurality of optical fibers where no covering portions are formed, an approximately rectangular groove is formed at the other end thereof for accommodating the portions of said optical fibers where covering portions are formed, and a tapered groove is formed which connects from said parallel groove towards the approximately rectangular groove whilst rectangular groove is formed at said other end thereof for accommodating the portions of said optical fibers where covering portions are formed.

Optical fibre array and method for manufacturing same

An aromatic hydrocarbon formaldehyde resin novolak, useful as a raw phenolic compound for producing a curing agent and an epoxy resin, an epoxy resin composition which contains a novolak type epoxy resin derived from the above novolak resin and an epoxy resin and is therefore excellent in heat resistance, adhesion and humidity resistance, and a process for the production of a phenolic resin, which comprises reacting an aromatic hydrocarbon formaldehyde resin, phenol and formaldehyde in a novolak-forming reaction in the presence of a catalyst to prepare an aromatic hydrocarbon formaldehyde resin novolak, and treating the reaction product with steam while maintaining the temperature of a reaction mixture at 120.degree. to 195.degree. C. to remove unreacted substances and to decompose high-molecular-weight polymers.

Process for the production of phenolic resin and epoxy resin composition

A process for polymerizing trioxane made from an aqueous solution of methanol-containing formaldehyde by a conventional method or copolymerizing the trioxane with another monomer, characterized by

Process for polymerizing trioxane

A process for producing a 2-tertiary-alkyl substituted anthraquinone, characterized by carrying out catalytic oxidation of a diphenylmethane type compound having the formula ##STR1## wherein R.sub.1 and R.sub.2 are different from each other, and independently hydrogen or tertiary-alkyl having 4 and 5 carbon atoms with the proviso that one of R.sub.1 and R.sub.2 is hydrogen, and R.sub.3 is alkyl having 1-3 carbon atoms, in vapor phase in the presence of a catalyst comprising vanadium oxide is disclosed.

Process for producing a 2-tertiary-alkyl substituted anthraquinone

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Tokyo, Japan

Michio Ohba