| 摘要 |
PROBLEM TO BE SOLVED: To provide a multilayer substrate for eliminating troubles caused by the stress in burning. SOLUTION: An insulation layer made of a five-layer alumina is laminated, a through groove for wiring in a layer is formed at insulation layers 2 and 3, and a wiring material 8 in layer is arranged in the through groove for wiring in a layer. The wiring material 8 in layer has a band shape, where it is 0.25mm thick and 10mm wide. An arc part 11 (R part) with a radius of curvature (R) of 0.25mm is provided at four corners of a rectangle in the wiring material 8 in layer, and the corner of the wiring material 8 in layer is chamfered. Stress at the corner can be relaxed in burning and the generation of a crack at the insulation layers 2 and 3 with the corner part of the wiring material 8 in layer as a starting point can be suppressed. |
