Patent ID: 8430152

Claim:
A heat dissipation device, comprising: a round heat sink comprising a cylindrical core, and a plurality of sets of first fins and a plurality of sets of second fins extending outwardly from an outer surface of the cylindrical core, the plurality of sets of first fins and the plurality of sets of second fins being alternately arranged along a circumferential direction of the heat sink, each first fin being wider than each second fin as measured along a substantially radial direction of the heat sink, the heat sink defining a plurality of receiving depressions at an outer peripheral surface thereof, each of the receiving depressions being provided between two corresponding neighboring sets of first fins; and a fixing frame comprising a peripheral side plate disposed around the heat sink and a plurality of fixing legs corresponding to the receiving depressions of the heat sink extending downwardly from the side plate, the side plate comprising a plurality of blocks extending inwardly from an inner surface thereof, a first rib and a second rib extending inwardly from the inner surface of the side plate, the first rib comprising a stopping surface at a lateral side thereof farthest away from the second rib and a curved guide surface at another lateral side thereof nearest to the second rib, the second rib comprising a limitation surface at a lateral side thereof farthest away from the first rib, a plurality of protruding members extending inwardly from the fixing legs; wherein the heat sink is rotatably received in the fixing frame with a top of the heat sink abutting the blocks, and when the heat sink is in an unlocked state, the protruding members align with the receiving depressions, respectively, and when the heat sink is rotated to a locked state, the protruding members abut a bottom of the heat sink.