Patent ID: 9111911
Filing Date: 2015-08-18
Classification: F28D,H01L,H05K

Abstract:
1. A heat sink that has therein a flow path through which a cooling medium that cools a heat-producing body flows, wherein the flow path has two flow path wall surfaces that face each other, the heat sink comprising: a plurality of columnar fins that are provided on one of the flow path wall surfaces, the one of the flow path wall surfaces being positioned at a side where the heat-producing body is provided, the plurality of the columnar fins including long columnar fins and short columnar fins and protruding from the one of the flow path wall surfaces in a protrusion direction perpendicular to the one of the flow path wall surfaces, the long columnar fins being longer than the short columnar fins in the protrusion direction, and the other of the flow path wall surfaces having a recess defining a concave portion in which a distal end portion of the long columnar fin is inserted, a plurality of concave portions and convex portions that are provided on the other of the flow path wall surfaces, a row of long columnar fins facing one of the concave portions and a row of short columnar fins facing one of the convex portions.