Furukawa Circuit Foil Co., Ltd.

The Furukawa Electric Co., Ltd.

Hideo Otsuka

Akira Matsuda

Yuuji Suzuki

Sadao Matsumoto

Yuuki Kikuchi

Akitoshi Suzuki

Hisao Kimijima

Tadao Nakaoka

A plating bath, able to form a resistance layer with a uniform thickness distribution on the roughened surface of a conductive base, including nickel ions and sulfamic acid or its salt as essential components and at least one of phosphoric acid, phosphorous acid, hypophosphorous acid, and salts of the same; a conductive base having a thin resistance layer with a stable resistance, and a resistance circuit board material using the same.

Method for preparing a circuit board material having a conductive base and a resistance layer

A conductive substrate with a resistance layer comprising a substantially flat high conductivity substrate roughening treated on its surface by a resistance component and provided with a resistance layer by the resistance component so as to enable the interface between the high conductivity substrate and resistance component layer to be substantially flattened, enable acquisition of a thin film resistance layer with a stable resistance after dissolving away the high conductivity substrate, and able to maintain the peel strength with the insulating support, and a resistance board using the same.

Conductive substrate with resistance layer, resistance board, and resistance circuit board

A copper foil for chip-on-film use, a plasma display panel, or a high-frequency printed circuit board obtained by rolling copper foil to smooth the surface to give a surface area of not more than 1.30 times an ideal smooth surface, the smoothed copper foil having deposited on it fine roughening particles of Cu or alloy particles of Cu and Mo or alloy particles comprising Cu and at least one element selected among a group of Ni, Co, Fe, and Cr or a mixture of this alloy particles and oxide of at least one element selected among a group of V, Mo, and W.

Copper foil for chip-on-film use, plasma display panel, or high-frequency printed circuit board

Growing community of inventors

Tochigi, Japan

Hideo Otsuka