Heat pipe circuit board

摘要

A heat pipe circuit board comprising: a heat pipe; at least one insulating layer; a circuit pattern provided on a surface of or inside the at least one insulating layer; and electronic components being mounted on the heat pipe through the insulating layer. The heat pipe is formed by jointing two plate members by friction stir welding, at least one of the two plate members being provided with a recess portion which is a fluid channel of a working fluid.