Nisshinbo Holdings Inc.

Nippon Seiki Co., Ltd.

Kohei Moriyama

Makoto Hada

Kazutoshi Hayakawa

Toshifumi Hashiba

Satomi Kudo

Tsuyoshi Fujii

Conductive particles each includes a polymer base particle and a conductive layer coating the polymer base particle. Let the compressive elastic deformation characteristic Kof one conductive particle when the displacement of particle diameter of the conductive particles is X % be defined by the following formula: K=(3/&#x221a;2)&#xb7;(S)&#xb7;(R)&#xb7;F. Fis the load (N) necessary for X % displacement of the conductive particles. Sis the compressive deformation amount (mm) upon X % displacement of the conductive particles. R is the particle radius (mm) of the conductive particles. The compressive elastic deformation characteristic Kwhen the displacement of particle diameter of the conductive particles is 50% is 100 to 50000 N/mmat 20&#xb0; C., and the recovery factor of particle diameter of the conductive particles when the displacement of particle diameter of the conductive particles is 50% is not less than 30% at 20&#xb0; C.

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Chiba, Japan

Kohei Moriyama