Patent ID: 8513806

Claim:
A laminated high melting point soldering layer comprising: a laminated structure which laminated a plurality of three-layered structures, the respective three-layered structures including a low melting point metal thin film layer and high melting point metal thin film layers disposed on a surface and a back side surface of the low melting point metal thin film layer; a first high melting point metal layer disposed on a surface of the laminated structure; and a second high melting point metal layer disposed on a back side surface of the laminated structure, wherein the low melting point metal thin film layer and the respective high melting point metal thin film layers are mutually alloyed by transient liquid phase bonding, and the laminated structure and the first high melting point metal layer and the second high melting point metal layer are mutually alloyed by the transient liquid phase bonding, wherein the low melting point metal thin film layer is formed with one of the group consisting of an Sn layer and an Sn—Ag eutectic solder layer, and the high melting point metal thin film layers and the first high melting point metal layer are formed with an Ag layer, and the second high melting point metal layer is formed with an Ni layer.