| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an insulation substrate capable of satisfying both of a cold heat cycle test and a power cycle test. <P>SOLUTION: An insulation substrate 50 comprises a first wiring layer 52, an insulation layer 54, and a second wiring layer 56. The first wiring layer 52 is constituted with one or more layers. The second wiring layer 56 is constituted with one or more layers. Total sum of 0.2% strength and thickness of each of the one or more layers constituting the first wiring layer 52 is smaller than total sum of 0.2% strength and thickness of each of the one or more layers constituting the second wiring layer 56. Thereby, the insulation substrate 50 is warped into a convex shape toward a radiator 30. <P>COPYRIGHT: (C)2012,JPO&INPIT |
