Patent ID: 8138428

Claim:
A metallized ceramics substrate comprising: a ceramics body; a wiring pattern formed on one surface of said ceramics body; a lead electrically-connected to said wiring pattern; and an outflow prevention member on said wiring pattern, wherein said ceramics body has a through-hole, said lead penetrates said through-hole and sticks out from another surface of said ceramics body, said lead is fixed by filling an electroconductive filler between said lead and said through-hole, so that airtightness is kept, said outflow prevention member is provided as a protrusion on said wiring pattern and limits the area to fill said electroconductive filler, and said wiring pattern has a triple-layer structure comprising: a lower layer; a middle layer; and an upper layer, Wherein said lower layer is formed by coating a conductive paste containing ceramics powder, said middle layer is formed by coating a conductive paste which does not contain ceramics powder, and said upper layer is formed by plating.