US Patent 7500513 Heat-pipe type heat sink

A heat-pipe type heat sink (100) includes a plurality of fins (10), at least a heat pipe (20) extending through the fins, and soldering material (40) disposed between the heat pipe and the fins. Each of the fins defines therein a through hole (12) and a cutout (13) adjacent to the through hole. A sidewall of the through hole forms a collar (122) contacting with the heat pipe, whilst a sidewall of the cutout forms at least a fringe (132) connecting with the collar. The fringe guides the soldering material in molten state to flow from the cutout towards the collar to fill in a gap formed between the heat pipe and the fins to bond the heat pipe and the fins together after the molten soldering material is cooled.