| 摘要 |
PROBLEM TO BE SOLVED: To provide a substrate which hardly cracks or peels from a metal plate and has high reliability and high productivity. SOLUTION: The substrate having metal plates 1, 3 bonded to the front and back sides of an insulation plate 2 comprises a plurality of electrically mutually insulated metal plates 1a, 1b, 1c on the front side of the insulation plate 2, and a plurality of metal plates 3a, 3b, 3c having approximately identical shapes to the front side metal plates 1a, 1b, 1c on the backside of the insulation plate 2. The plates 3a, 3b, 3c are disposed approximately plane-symmetrically to the plates 1a, 1b, 1c with the insulation plate 2 between. |
