| 摘要 |
PROBLEM TO BE SOLVED: To provide a light heat sink with a large heat radiation amount that can have a form and a fin pitch optimal for radiating heat by a natural convection, and that can be manufactured at low costs.SOLUTION: A heat sink has a cylindrical center base part A, and plural fins B projecting on an outer face side of the center base part A at intervals in a cylinder circumferential direction, and is constituted by annularly coupling plural constituting members x of an identical shape. Each constituting member x has a base part a constituting one part of the center base part A, plural fins b projecting on the base part a, and coupling means constituting part c formed on the base part a and coupled with the coupling means constituting part c of the other constituting member x. Some fins b out of the plural fins b of the constituting members x comprise trunk-like fin parts b1 projecting on the base part a, and branch-like fin parts b2 projecting on the trunk-like fin parts b1, and the plural constituting members x are annularly coupled with each other by coupling the coupling means constituting part c between the base parts a of the adjacent constituting members x. |
