Patent ID: 8188376

Claim:
An insulation substrate comprising: a conductive pattern that is provided on a surface of a ceramics substrate, wherein, of an external surface of a conductor constituting the conductive pattern, a rising surface that rises from the surface of the ceramics substrate substantially rises vertically with respect to a direction along the surface of the ceramics substrate, the rising surface of said conductor has first and second rising surfaces, said first rising surface is provided at a lower part of the rising surface and has a surface roughness of Rz 30 μm or more and said second rising surface is provided at an upper part of the rising surface and has a surface roughness of Rz 30 μm or less, the surface roughness of the first rising surface is larger than the surface roughness of the second rising surface, the conductive pattern is joined with the surface of the ceramics substrate by a brazing filler metal, and at least the first rising surface of the conductor in a direction in which the rising surface rises from the surface of the ceramics substrate is covered with the brazing filler metal.