Hitachi, Ltd.

Mamoru Ogihara

Hidetaka Shigi

Haruhiko Matsuyama

Hideo Sotokawa

Takashi Inoue

Eiji Matsuzaki

Koji Suzuki

Yasunori Narizuka

Akira Yabushita

Hideho Yamamura

Masashi Nishiki

Naoki Maru

Minoru Tanaka

Toshio Terouchi

A parallel power system is provided which can flexibly change output currents and the number of channels in short time and at low cost. A back board of the parallel power system has connectors ECC and DCC for plug-in mounting power source circuits to and an electronic circuit . Terminals of the connectors DCC and EDC are connected by wiring lines HP. The power source circuits to constitute a first voltage channel by a power source line DH and a parallel operation control line PCH of the electronic circuit , whereas the power source circuits to constitute a second voltage channel by a power source line DH and a parallel operation control line PCH . When a specification of the electronic circuit is to be changed, only the power source lines DH and DH and parallel operation control lines PCH and PCH are changed without changing the back board and the like.

Parallel power system and an electronic apparatus using the power system

Circuit board and method of manufacturing the same

A metalization structure having a first conductor layer on the surface of an underlying layer and, further, a second conductor layer connected conductively with the first conductor layer in which a polyimide insulative film of low thermal expansion coefficient is present between at least an end of a pattern of the second conductor layer and the first conductor layer, for stably obtaining a metalization structure of high reliability and free from the worry of peeling of the conductor portion from a substrate or occurrence of cracking to the underlying layer.

Metalization structure and manufacturing method thereof

Growing community of inventors

Ashigarakami-gun, Japan

Mamoru Ogihara