Patent ID: 7333337

Claim:
An electric junction box comprising: a circuit including a control circuit board and a bus bar, said control circuit board having conductive circuits formed in and electronic components mounted on a first one of front and rear surfaces thereof and said bus bar provided on a second one of the front and rear surfaces of said control circuit board; a heat sink provided on said bus bar on a surface opposite to the surface facing said control circuit board through an insulating layer, said heat sink including a planar member including thermal diffusion portions having one of substantially hemispherical convex and substantially hemispherical concave shapes on a surface opposite to the surface contacting said bus bar; and a case containing said circuit and said heat sink; wherein said heat sink includes convex shaped thermal diffusion portions projecting from said surface opposite to the surface contacting said bus bar; and further comprising a notch provided at a crest of each of said convex shaped thermal diffusion portions.