Thermal dissipating metal core printed circuit board
First Claim
1. A metal core printed circuit board comprisinga sheet of metal having a thickness slightly less than the thickness of a standard complete printed circuit board,a base film of synthetic plastic resin forming a coating extending over at least one surface of said sheet, said coating having a roughened surface texture comprising a multiplicity of keying depressions,a circuit pattern on said coating comprising conducting metallic lines,said metallic lines comprising a base layer of nickel in keyed bonded engagement with said coating and the depresions therein, a film of copper in electroplated engagement with said nickel, an outer layer of nickel in electroplated engagement with said film of copper, a layer of pyrophosphate copper in bonded engagement with said last identified layer of nickel, and an overlying layer of metal unlike said copper and nickel in adhesive engagement with said pyrophosphate copper, there being spaces between said conducting metallic lines wherein said coating is exposed and said metal core is covered by said coating.
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Accused Products
Abstract
A metal core printed circuit board which includes multiple layers of synthetic plastic resin material on a sheet of metal, and wherein the surface of the plastic material is of such character that it provides an acceptable bond on which are built up sundry layers of different metals, the innermost layer on the plastic surface and the other layers positioned one upon another, ultimately comprising a built up circuit pattern, and wherein areas intermediate the circuit pattern comprise an exposed surface of the resin material.
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Citations
8 Claims
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1. A metal core printed circuit board comprising
a sheet of metal having a thickness slightly less than the thickness of a standard complete printed circuit board, a base film of synthetic plastic resin forming a coating extending over at least one surface of said sheet, said coating having a roughened surface texture comprising a multiplicity of keying depressions, a circuit pattern on said coating comprising conducting metallic lines, said metallic lines comprising a base layer of nickel in keyed bonded engagement with said coating and the depresions therein, a film of copper in electroplated engagement with said nickel, an outer layer of nickel in electroplated engagement with said film of copper, a layer of pyrophosphate copper in bonded engagement with said last identified layer of nickel, and an overlying layer of metal unlike said copper and nickel in adhesive engagement with said pyrophosphate copper, there being spaces between said conducting metallic lines wherein said coating is exposed and said metal core is covered by said coating.
Specification