| 摘要 |
PROBLEM TO BE SOLVED: To improve radiation performance per installation area in a heat sink where a radiation section made of a high heat-conductivity metal is surrounded by a frame section made of a material having a low thermal coefficient of expansion. SOLUTION: A heat spreader 10 comprises a radiation section 11 that is formed nearly in a square flat plate shape by copper having a high thermal coefficient of expansion, and a frame section 12 that is formed in a square frame shape by an invar having a low thermal coefficient of expansion. The radiation section 11 has a base section 13 in a square pole shape, the upper surface of the base section 13 is set to be a mounting surface 11a, and the lower surface is set to be a radiation surface 11b. At the side of the radiation surface 11b in the base 13, a radiation surface enlargement section 14 projecting from an outer periphery surface 13a to the outside is provided. The radiation surface enlargement section 14 forms the radiation surface 11b that is larger than the mounting surface 11a made of only the upper surface of the base section 13 along with the lower surface of the base section 13. The radiation surface enlargement section 14 efficiently radiates heat that is transferred from the side of the mounting surface 11a to the radiation section 11 from the radiation surface 11b.
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