Panasonic Intellectual Property Management Co., Ltd.

Panasonic Corporation

Junko Yashiro

Shinji Hashimoto

Naoyuki Kondou

Tohru Nakashiba

Naoyuki Kondo

Toru Nakashiba

Tooru Nakasiba

An optical-electrical composite flexible circuit substrate having sufficiently high bending resistance is provided. An optical-electrical composite flexible circuit substrate includes: an optical circuit that includes a core portion and a cladding layer that covers the core portion; and an electrical circuit, with the optical circuit and the electrical circuit being disposed at a position that includes a neutral surface when the optical-electrical composite flexible circuit substrate is bent, or at a position near the neutral surface. Alternatively, the optical-electrical composite flexible circuit substrate may include an optical circuit that includes a core portion and a cladding layer that covers the core portion; and a substrate that includes an electrical circuit, with the substrate and the optical circuit being laminated so that the electrical circuit is disposed on a side closer to the optical circuit.

Optical-electrical composite flexible circuit substrate including optical circuit and electrical circuit

In order to provide a method of efficiently manufacturing an optical waveguide core having an endface inclined at a predetermined angle, the following method of manufacturing an optical waveguide core is employed. The method includes: a core material layer forming step of forming a core material layer formed of a photosensitive material on a surface of a cladding layer that has been formed on a substrate; a high refractive index substance covering step of covering a surface of the core material layer with a substance having a refractive index higher than 1 by bringing the high refractive index substance into close contact with the core material layer surface; an exposure step of pattern exposing the core material layer in a predetermined core-forming shape to from a core by irradiating the core material layer on a side covered with the high refractive index substance with exposure light inclined at a predetermined angle with respect to the cladding layer surface; a high refractive index substance removing step of removing the high refractive index substance from the surface of the core material layer exposed in the exposure step; and an development step of developing the core material layer from which the high refractive index substance has been removed in the high refractive index substance removing step so as to form the core having an inclined endface.

Method of manufacturing optical waveguide core, method of manufacturing optical waveguide, optical waveguide, and optoelectric composite wiring board

Provided are a resin composition which offers both high transparency and a low linear expansion coefficient and can be used as a material for a dry film, and also a dry film obtained from this composition, an optical waveguide, and a photoelectric composite wiring board. The resin composition for an optical waveguide includes: (A) an epoxy resin constituted by a solid epoxy resin with one or less hydroxyl group in a molecule, and a liquid epoxy resin with one or less hydroxyl group in a molecule; (B) a curing agent with one or less hydroxyl group in a molecule; and (C) a nanosize silica sol, and contains no compound including two or more hydroxyl groups in a molecule as a resin component.

Resin composition for optical waveguide, dry film, optical waveguide, and photoelectric composite wiring board using same

In order to provide a method of manufacturing an optical waveguide, which enables the formation of a smooth mirror face, the following method of manufacturing an optical waveguide having a mirror face is used. The method includes: a photocurable resin sheet laminating step of laminating an uncured photocurable resin sheet for forming a core on a surface of a first cladding layer that has been formed on a substrate; a mirror face forming step of forming a mirror face for guiding light to the core by pressing a die provided with a blade having, in a cross-section, a 45&#xb0; inclined plane into the photocurable resin sheet; a core forming step of forming a core having the mirror face positioned at an end thereof by selectively exposing to light, and developing, the photocurable resin sheet; and a cladding layer forming step of forming a second cladding layer so as to bury the core.

Method of manufacturing optical waveguide having mirror face, and optoelectronic composite wiring board

An optical waveguide of excellent flex resistance which is to be formed on the surface of a flexible printed circuit is obtained by using an epoxy resin composition includes (A) a liquid epoxy compound, (B) a solid epoxy compound, and (C) a cationic curing initiator, wherein as the liquid epoxy compound (A), (A1) a liquid epoxy compound represented by general formula (I) below is included: (where Rand Rare each independently a hydrogen atom or a methyl group; Rto Rare each independently a hydrogen atom, a methyl group, a chlorine atom or a bromine atom; Ris an alkyleneoxy group or alkylene group of 1 to 15 carbons; p is 0 or 1; q is 1 to 25; r and s are 0 when p is 0, and are 1 when p is 1; and n is a positive integer which averages from 1 to 5).

Optical waveguide-forming epoxy resin composition, optical waveguide-forming curable film, optical-transmitting flexible printed circuit, and electronic information device

Growing community of inventors

Hirakata, Japan

Junko Yashiro