Hitachi Metals, Ltd.

Hitachi Cable, Inc.

Hideki Nounen

Takahiro Sugiyama

Takashi Kumakura

Yosuke Ishimatsu

Hisato Uetsuka

Tatsuo Teraoka

Koichi Maru

Masahiro Okawa

A differential signaling cable includes a pair of signal conductors provided in parallel, longitudinally within the differential signaling cable, an insulator covering a periphery of the pair of signal conductors as a whole, wherein only the insulator is between the pair of signal conductors, and a shield conductor provided on an outer periphery of the insulator. An interval between the pair of signal conductors is set so that an even-mode impedance of the pair of signal conductors having the interval fixed by embedment within the insulator and covered by the shield conductor, is in a range from 1.5 to 1.9 times an odd-mode impedance for improved skew and differential mode insertion loss experienced during a transmission of high-speed signals of at least 10 Gbps.

Differential signaling cable, transmission cable assembly using same, and production method for differential signaling cable

A differential signaling cable according to the present invention comprises: a pair of signal conductors provided in parallel; an insulator which covers the periphery of the pair of signal conductors in a batch; and a shield conductor provided on the outer periphery of the insulator, in which an interval between the pair of signal conductors is specified so that even-mode impedance becomes 1.5 to 1.9 times odd-mode impedance.

There is provided a flexible harness adapted to be detachably connected to electrode pads of an electric/electronic component. The flexible harness according to the present invention comprises: a flexible insulator film; a conductor pattern formed on the flexible insulator film; a terminal plane which is an end region of the conductor pattern; and ball-like contact bumps formed on the terminal plane. Each contact bump includes a core made of an elastically deformable resin and an electrical conductor layer surrounding the core.

Flexible harness and electrical connector cable using same

An optical wavelength multiplexer/demultiplexer includes a substrate, an input channel waveguide, an input slab waveguide, a channel waveguide array which has a plurality of channel waveguides, each channel waveguide differing in length from its neighboring waveguide by predetermined amount, an output slab waveguide, and a plurality of output channel waveguides. The input slab waveguide or output slab waveguide have a temperature compensation material, in its light path, having an opposite sign of diffraction temperature change to the plurality of channel wave guides, or a material capable of canceling a change in the in-phase plane of light having each wavelength which occurs in a vicinity of the channel waveguide array and the slab waveguide, or a waveguide for band width adjustment on which a waveguide to adjust band width of wavelength multiplexing light is provided.

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Hitachi, Japan

Hideki Nounen