Patent ID: 6080936
Filing Date: 2000-06-27
Classification: H01R,H05K,Y02P

Abstract:
A connecting board interposed between a base plate having a plurality surface-bonding pads and a mounting board having a plurality of surface-bonding and mounting pads at corresponding positions to the surface-bonding pads of the base plate, for connection of the base plate and the mounting board through connection at the surface-bonding pads located on the side of a first surface of the connecting board and at the surface-bonding and mounting pads located on the side of a second surface of the connecting board, the connecting board comprising:a substrate in the form of a flat plate, having said first surface and said second surface and a plurality of through holes extending between said first and second surfaces;said substrate being made of a ceramic material; anda plurality of soft metal bodies mounted in said through holes, respectively, each of said soft metal bodies having a first protruded portion protruding from one of said first and second surfaces and a second protruded portion protruding from the other of said first and second surfaces, said first protruded portion and said second protruded portion being different in height from each other;wherein said first protruded portion of each of said soft metal bodies is in the form of a pillar and of such a height above one of said first and second surfaces that is larger than the maximum diameter of a cross section of said pillar, andwherein a metal layer is formed on an inner circumferential surface of each of said through holes, and said metal layer is welded onto each of said soft metal bodies.