| 摘要 |
PROBLEM TO BE SOLVED: To provide a circuit board having both the thermal conductivity and light reflection function. SOLUTION: The metal base circuit board is provided which has a circuit on a metal plate via an insulating layer, wherein a white film is provided at least on the insulation layer. Alternatively the metal base circuit board is provided which has a plurality of insulation layers and circuits, alternately arranged on the metal plate, wherein a white film is provided at least on an insulation layer that is the most distant from the metal plate. Alternatively the metal base circuit boards are provided, wherein the insulation layer desirably contains an inorganic filler, an epoxy resin and a curing agent of the epoxy resin, and has a thermal conductivity of 1 W/mK or higher. COPYRIGHT: (C)2009,JPO&INPIT
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