Patent ID: 7507477

Claim:
A conductive fine particle, wherein an alloy plated coating film containing nickel, copper and phosphorous is formed on a surface of a core particle by an electroless plating methods, wherein the alloy plated coating film contains nickel and phosphorous in a region of not greater than 20% from the core particle side, and contains nickel, copper and phosphorous in a region of not greater than 80% from the surface side of the alloy plated coating film, in the direction of the thickness in the alloy plated coated film, and wherein the alloy plated coating film contains 8 to 15 wt % of phosphorous in the region of not greater than 20% from the core particle side, and contains 0.05 to 5 wt % of phosphorous in the region of not greater than 80% from the surface side of the alloy plated coating film, in the direction of the thickness in the alloy plated coating film.