Patent ID: 6860004

Claim:
A method of manufacturing a thermally conductive circuit board with a grounding pattern connected to a heat sink, where a part of the lead frame and the heat sink are connected electrically, the method comprising: (1) placing a metal pole in a desired place in a lead frame as a wiring pattern; and (2) superposing the lead frame, a sheet-like thermally conductive resin composition made of 70 to 95 wt. % inorganic filler and 5 to 30 wt. % resin composition containing at least uncured thermosetting resin, and an electrically conductive heat sink sequentially with a portion of the metal pole protruding from the lead frame facing the sheet-like thermally conductive resin composition, and heating and compressing them, so that the metal pole is connected to the electrically conductive heat sink, the sheet-like thermally conductive resin composition is allowed to fill up to a surface of the lead frame, and the thermosetting resin contained in the sheet-like thermally conductive resin composition is cured.