| 摘要 |
PROBLEM TO BE SOLVED: To obtain a high density power module capable of using an existing printed board capable of forming an independently island-like wiring pattern while using a lead frame, by limiting to a place need to radiate and forming a fine wiring pattern at a place not so needed to radiate. SOLUTION: The power module comprises a circuit board 101 obtained by impregnating a reinforce material with a thermosetting resin, an insulating resin mixture 102 filled in the opening formed at the board 101 and containing an inorganic filler and an insulating resin, a lead frame 103 adapted to a large- current circuit formed of the mixture 102 having high heat sink, and a fine wiring pattern 104 made of a metal foil. In this case, the module is formed in a structure in which the mixture 102 is provided as a highly thermally conductive layer having high radiating properties at a desired part of the board 101. |
