| 摘要 |
PURPOSE:To provide a fixing structure of a heat sink having a shield fence which does not turn to hindrance to cooling, because high speed LSI's appear and radiation noise and heat generation from the LSI's increase. CONSTITUTION:An LSI case 2 and a box type shield fence 4 which is formed from conductive material between heat sinks 8 and covers the LSI case 2 are set and fixed by heat sink fixing structure with a screw. A panel type contact 11 formed on the end portion of the shield fence 4 comes into contact with a ground pad 5 on an insulating board, and is electrically connected and grounded. A reference potential enclosure which surrounds the LSI case 2 by the shield fence 4 and a reference potential power supply layer in a wiring board 3 is formed. Thereby electromagnetic waves radiated from a semiconductor element can be shielded. |
