HEAT SINK

To provide a heat sink in which thermal resistance when heat is transmitted from a heat-generating body to a heat-receiving part of a heat pipe is reduced thereby realizing excellent cooling characteristics even for a heat-generating body having a high calorific value.SOLUTION: A heat sink comprises: a heat pipe that has a heat-receiving part thermally connected to a heat-generating body; and a heat exchanger thermally connected to a heat-releasing part of the heat pipe. The heat pipe has an internal space sealed and including working fluid, the internal space allowing communication from the heat-receiving part to the heat-releasing part. A portion of the heat-receiving part that faces the heat-generating body is a flat part that is flat along an extension direction of the heat-generating body. The flat part is directly in contact with the heat-generating body.SELECTED DRAWING: Figure 1 【課題】発熱体からヒートパイプの受熱部へ熱が伝達される際の熱抵抗を低減することで、高発熱量の発熱体に対しても優れた冷却特性を発揮できるヒートシンクを提供する。【解決手段】発熱体と熱的に接続される受熱部を有するヒートパイプと、前記ヒートパイプの放熱部にて熱的に接続された熱交換部と、を備えたヒートシンクであり、前記ヒートパイプが、前記受熱部から前記放熱部まで連通し、且つ作動流体が封入された内部空間を有し、前記受熱部の、前記発熱体と対向する部位が、前記発熱体の延在方向に沿って平坦な平坦部であり、前記平坦部が、前記発熱体と直接接触するヒートシンク。【選択図】図１