Hitachi Cable, Inc.

Hitachi Metals, Ltd.

Nippon Shokubai Co., Ltd.

Hitachi Cable Fine-tech, Ltd.

Takami Ushiwata

Hiroki Yasuda

Kouki Hirano

Koki Hirano

Hideyuki Kikuchi

Yuki Honda

Shuta Nabeshima

Kozo Tajiri

Tomomi Makino

Tomiya Abe

Juhyun Yu

Kenichi Murakami

Masahiko Kobayashi

Yasuhiro Funayama

Hidehito Hanawa

Masanobu Ito

An insulated wire includes a conductor and an insulating layer formed on an outer periphery of the conductor, and the insulating layer is composed essentially of a polyimide resin having a repeating unit A represented by Formula (1) as a part of a molecular structure, in which a water absorption coefficient is not greater than 2.8% after 24 hours under condition at temperature of 40&#xb0; C. and humidity of 95%. 

Insulated wire and coil using same

An insulated wire includes a conductor, and a polyimide insulation layer formed on an outer periphery of the conductor. The insulation layer includes a polyimide including a repeating unit represented by formula (1) and a repeating unit represented by formula (2). A first acid component in the repeating unit represented by the formula (1) and a second acid component in the repeating unit represented by the formula (2) are mixed in a molar ratio range of 85:15 to 40:60 as expressed by a molar ratio (the first acid component:the second acid component). R as a residue of a diamine component in the formulas (1) and (2) includes a residue of 4,4'-diaminodiphenyl ether and a residue of one selected from a group of diamines represented by the formulas (3) to (8). A storage elastic modulus of the polyimide at 325&#xb0; C. is not less than 50 MPa.

Insulated wire and coil using the same

An insulated electric wire includes a conductor and an insulating coating provided around a perimeter of the conductor. The insulating coating includes a first insulating coating film around the perimeter of the conductor, the first insulating coating film being formed of a resin containing an imide structure in its molecule, and a second insulating coating film around a perimeter of the first insulating coating film, the second insulating coating film being formed of a polyimide resin comprising a repeat unit represented by Formula 1, and having an imide concentration of not less than 15% and not more than 36%, 

Insulated electric wire and coil using same

An insulated wire includes a conductor, and an insulating covering layer including a first insulation layer formed around the conductor and a second insulation layer formed around the first insulation layer. An elastic modulus of the second insulation layer at 300&#xb0; C. is not less than 300 MPa, and a relative permittivity of the insulating covering layer is not more than 3.0.

Insulated wire and coil

A insulated wire includes a conductor, and an insulating coating on a periphery of the conductor. The insulating coating includes an insulating film formed by applying and baking a polyester imide resin insulating coating material, and the insulating film has a relative permittivity of less than 3.5 both in a dried state and in a moisture-absorbed state. The insulating film is formed by applying and baking a polyester imide resin insulating coating material including an imide dicarboxylic acid and an alcohol component, the imide dicarboxylic acid being obtained by synthesizing a diamine component including aromatic diamine having not less than three aromatic rings and an acid component including aromatic tricarboxylic acid anhydride.

Polyester imide resin insulating coating material, insulated wire using same, and coil

A combined optical and electrical flexible wiring includes a first film substrate, a plurality of conductors aligned parallel on a surface of the first film substrate, an optical fiber provided on the surface of the first film substrate and aligned parallel to the plural conductors, a second film substrate with which the plural conductors and the optical fiber are covered in such a manner as to include an exposed portion, a resin mount provided over the exposed portion in such a manner as to cover the plural conductors and the optical fiber, the resin mount being formed with a light inlet or outlet groove including a mirror surface therein, an optical-electrical conversion component formed on a surface of the resin mount, and a wiring pattern formed on the surface of the resin mount.

Combined optical and electrical flexible wiring and production method therefor

An optical wiring member according to the present invention includes: a substrate on which a light-emitting device and a light-receiving device are mounted; and an optical waveguide comprising a communication optical waveguide core and an optical waveguide clad that entirely covers the communication optical waveguide core, the optical waveguide being mounted on the substrate, in which the optical waveguide is equipped with a position-aligning light guiding portion for introducing position-aligning light into the communication optical waveguide core. By using, as a target light, the position-aligning light that is introduced into the communication optical waveguide coreand exits from the substrate, at least either the light-emitting device or the light-receiving device can be positioned.

Optical waveguide, optical wiring member, and method of mounting optical device on optical wiring member

A combined optical and electrical interconnection module includes a flat cable comprising an optical transmission line and an electrical wire, and a printed circuit board including a light receiving module for receiving optical signals and/or a light sending module for sending optical signals and an optical waveguide for the optical signals to be transmitted therethrough or an optical block for bending the optical paths of the optical signals. The printed circuit board is electrically and optically connected to both ends or one end of the flat cable.

Combined optical and electrical interconnection module and method for producing same

A mirror-embedded light transmission medium according to the present invention comprises: a light transmission medium including a light transmission layer, light being transmitted through the light transmission layer; a rough surface which terminates the light transmission layer, a direction of the rough surface being parallel or oblique to a light transmission direction of the light transmission layer; a reflection enhancing layer that adherently covers the rough surface; and a smooth surface formed over the reflection enhancing layer, the smooth surface reflecting the light transmitted through the light transmission layer.

Mirror-embedded light transmission medium and fabrication method of same

An optical waveguide substrate with an optical fiber fixation groove, including an optical waveguide which contains a lower cladding layer on a base substrate, wherein the lower cladding layer has an optical fiber fixation groove and a core groove, and a weir is provided between the optical fiber fixation groove and the core groove. The optical waveguide substrate with an optical fiber fixation groove is produced by forming a lower cladding layer on a base substrate using a male stamp produced from a female stamp and then successively forming a core layer and an upper cladding layer thereon.

Optical waveguide substrate with optical fiber fixation groove, process for its production, stamps for use in this production process, and opto-electronic hybrid integrated module including said optical waveguide substrate

The invention provides a flexible optical waveguide in which an optical waveguide film is directly formed on a substrate without using an adhesive and which is excellent in flexibility of the optical waveguide film, including the substrate, and excellent in adhesiveness between the substrate and the optical waveguide film, as well as a process for producing the flexible optical waveguide in a simple and easy manner. The flexible optical waveguide includes a lower cladding layer, a core layer, and an upper cladding layer successively formed on a substrate and a surface of the substrate, on which surface the lower cladding layer is to be formed, has an arithmetic average roughness (Ra) of 0.03 &#x3bc;m or higher. The flexible optical waveguide can be produced by subjecting a surface of the substrate, on which surface the lower cladding layer is to be formed, to physical treatment with a whetstone or chemical treatment with a corona discharge and then successively forming the lower cladding layer, the core layer, and the upper cladding layer on the surface of the substrate.

Flexible optical waveguide and process for its production

An optical fiber mounting waveguide device includes a substrate, an optical fiber mounting groove provided on a part of the substrate for mounting an optical fiber, an under cladding layer and a core sequentially formed on the substrate, and an over cladding layer formed on the core, the over cladding layer having an end surface facing to the optical fiber mounting groove, and wherein the core and the under cladding layer are protruded toward the optical fiber mounting groove with respect to the end surface of the over cladding layer.

Optical fiber mounting waveguide device and method for fabricating same

An optical fiber mounting waveguide device and a method for fabricating the same, which provide a low optical connection loss and a high productivity. An under cladding layer (), a core (), and an over cladding layer () are sequentially formed on a substrate () to constitute an optical fiber mounting waveguide device (). An optical fiber mounting groove () for mounting an optical fiber () is formed on the optical fiber mounting waveguide device (). An end surface () of the over cladding layer () faces to the optical fiber mounting groove (). The core () and the under cladding layer () are projected toward the optical fiber mounting groove () with respect to the end surface () of the over cladding layer ().

A flexible optical interconnection structure has a plurality of layers including an optical waveguide made of a core and a clad. The core is disposed to include a neutral surface that is not affected by expansion or contraction by bending. Alternatively, when the neutral surface is position outside the core, the core is disposed to satisfy &#x394;y&#x2266;0.03&#xd7;R, in which &#x394;y is a distance between the neutral surface and a surface of the core at a side near the neutral surface, and R is a curvature radius of an innermost surface of the flexible optical interconnection structure in the bent state.

Flexible optical interconnection structure and method for fabricating same

An optical fiber holderwhich directs an angulated groovein which an optical fiberis disposed to a substrateand overlays the angulated grooveon the substratemay be formed first. Next, a guidewhich guides the optical fiber holderto the position where the optical fiberand the optical deviceare to be optically coupled to each other is formed on the substrate. Next, a 45-degree mirror is formed by dicing the optical fiber holderand the optical fibertogether in a state in which the optical fiberis disposed in the angulated groove. Finally, the optical fiber holderis overlaid on the substrate, and the optical fiber holderis guided by the guide

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Hitachi, Japan

Takami Ushiwata