Ngk Insulators, Inc.

Satoru Kawai

Tadashi Otagiri

Shuhei Ishikawa

Tomio Suzuki

A substrate material ( ) for printed circuit, comprising a sheet-shaped composite material ( ) composed of a plastic and a ceramic and conductive metal wires ( ) fixed in the composite material ( ) at given pitches, wherein the two surfaces of the substrate material ( ) have electrical connection to each other via the metal wires ( ). A process for producing a substrate material for printed circuit, which comprises stretching, in a mold, conductive metal wires at given pitches, then pouring, into the mold, a composite material composed of a plastic and a ceramic, curing the composite material, thereafter slicing the resulting material in a direction approximately perpendicular to the direction of the metal wires. Good electrical connection can be secured, and it is possible to prevent, during use, peeling between substrate material and conductive layers and between insulating material and metal wires. A printed circuit board of high density and excellent dimensional accuracy can be obtained.

Printed circuit board material and method of manufacturing board material and intermediate block body for board material

A wire conductor for a wiring harness includes a stranded wire obtained by twisting strands around a core wire. The core wire is composed of beryllium copper and the strands twisted around the core wire are composed of annealed copper. Preferably, the wire conductor includes a stranded wire obtained by twisting 6, 12 or 18 strands around the core wire. Half of the strands twisted around the core wire are composed of beryllium copper, the remaining strands and the core wire are composed of annealed copper, and the strands composed of beryllium copper and the strands composed of annealed copper are alternately arranged around the core wire. The wire conductor has sufficient conductivity and strength, causes no disconnection even when produced in a small diameter, and has appropriate flexibility.

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Nagoya, Japan

Satoru Kawai