Panasonic Intellectual Property Management Co., Ltd.

Toru Nakashiba

Shingo Maeda

Shinji Hashimoto

Junko Kurizoe

Naoyuki Kondo

Naoyuki Kondou

Seiji Takagi

Shingo Yoshioka

Junko Yashiro

An optical-waveguide-clad composition includes a bisphenol type epoxy compound (A), and an epoxy compound (B) containing, in a molecule, at least one of a structure represented by the following formula (1) and a structure represented by the following formula (2), and having a molecular weight of 350 or higher. In the formula (1), Rand Reach independently represent a hydrogen atom or an alkyl group, and m represents 2 to 15. In the formula (2), Rand Reach independently represent a hydrogen atom or an alkyl group, and n represents 2 to 15.

Optical-waveguide-clad composition, optical-waveguide-clad dry film, and optical waveguide

Provided is a resin composition for optical waveguide cores, the resin composition including liquid epoxy resin, and solid epoxy resin, in which a coefficient of variation calculated from a weighted average value of a refractive index of the liquid epoxy resin and a refractive index of the solid epoxy resin is 2.10% or less.

Resin composition for optical waveguide cores, and dry film, optical waveguide core and photoelectric composite wiring board, each of which uses same

An optical waveguide is provided and includes: a core forming layer with a high refractive index; and a first clad layer with a low refractive index, bonded to a first main surface of the core forming layer. The core forming layer is provided in its plane direction with a core portion, lateral clad portions each having one side adjacent to a corresponding side of the core portion, and high refractive index portions each adjacent to the other side of a corresponding one of the lateral clad portions. The core portion is provided in its plane direction with a central region, and GI regions in each of which a refractive index continuously decreases from the central region toward an interface with the corresponding one of the lateral clad portions. The lateral clad portions each include a region having a constant refractive index.

Optical waveguide and method for manufacturing same

A composition for an optical waveguide is cured into a sheet to give a cured product. A difference in light transmittance with respect to light having a wavelength of 450 nm is 15% or less between this cured product and this cured product after retention in atmosphere at 175&#xb0; C. for 40 hours, the light transmittance being calculated in terms of the cured product at a thickness of 50 &#x3bc;m.

Composition for optical waveguide, dry film for optical waveguide and optical waveguide using epoxies

The present invention relates to a dry film for optical waveguides, obtained through sequential stacking of a carrier film, a plating adhesion layer, an uncured cladding layer and a cover film. Solid microparticles are dispersed in a resin composition that constitutes the plating adhesion layer.

Dry film for optical waveguides, optical waveguide using same, photoelectric composite wiring board using same, and method for producing photoelectric composite wiring board

The present invention relates to a dry film for an optical waveguide which has a carrier base material, a resin layer for an optical waveguide that can be cured by active energy ray or heat, and a protective film. The surface of the protective film that is in contact with the resin layer for an optical waveguide is a roughened surface.

Optical waveguide dry film, and optical waveguide manufacturing method and optical waveguide using optical waveguide dry film

The present invention provides an optical waveguide excellent in all of transparency, a bending property and heat resistance and a dry film for manufacturing an optical waveguide. A clad layer of the optical waveguide according to the present invention is formed by using a dry film containing a polymer comprising at least a (meth)acrylate monomer with an epoxy group and a (meth)acrylate monomer without an epoxy group; and cationic or anionic curing initiator.

Optical waveguide and dry film for optical waveguide production

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.

Growing community of inventors

Osaka, Japan

Toru Nakashiba