Patent ID: 7312994

Claim:
A heat dissipation device comprising: a heat conducting base; a heat sink on the heat conducting base, the heat sink comprising a plurality of walls interconnected to form a heat conducting cylinder at a periphery thereof and a plurality of fins in the cylinder, the fins extending from the walls, the fins subjected to the same wall paralleling to each other; a heat pipe thermally surrounding the cylinder of the heat sink and thermally contacting the heat conducting base, wherein the heat pipe is U-shaped and comprises a first section, a second section parallel to the first section and a middle section connecting the first section and the second section, the first, second and middle sections of the heat pipe all thermally contacting the heat sink; and a second heat pipe, wherein the second heat pipe is U-shaped and comprises a first section, a second section parallel to the first section and a middle section connecting the first section and the second section; wherein two side walls of the walls of the heat sink define two grooves therein, respectively, the two grooves being offset to each other, the middle sections of the heat pipes being received in the two grooves, respectively.