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A heat dissipation device assembly comprises a heat sink having a columniform conductive core and a plurality of fins arranged radially around the conductive core, a columnar fan cover housing the heat sink and defining a first open end and a second open end, and a fan located at the second open end

A heat dissipation device assembly comprises a heat sink having a columniform conductive core and a plurality of fins arranged radially around the conductive core, a columnar fan cover housing the heat sink and defining a first open end and a second open end, and a fan located at the second open end of the fan cover. Pluralities of channels are formed between the radiation fins. A plurality of elongated slot surrounding the heat sink is defined in the fan cover and extends from the first open end of the fan cover to the second open end. The airflow provided by the fan travels through the channels and the slots to outside of the fan cover.

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What is claimed is: 1. A heat dissipation device assembly comprising: a heat sink comprising a conductive core and a plurality of radiation fins radially arranged around the conductive core, pluralities of channels being defined between the radiation fins; a fan cover housing the heat sink therein

What is claimed is: 1. A heat dissipation device assembly comprising: a heat sink comprising a conductive core and a plurality of radiation fins radially arranged around the conductive core, pluralities of channels being defined between the radiation fins; a fan cover housing the heat sink therein and defining along the central line thereof a first open end and a second open end opposite to the first open end, a plurality of elongated slots being defined in the fan cover and extending from the first open end to a position adjacent to the second open end; and a fan located adjacent to the second open end of the fan cover for providing airflow from the second open end of the fan cover through the channels and the slots to outside of the fan cover. 2. The heat dissipation device assembly as claimed in claim 1, wherein the radiation fins are arranged in a manner to be inclined with respect to the central line of the conductive core. 3. The heat dissipation device assembly as claimed in claim 2, wherein the radiation fins are curved. 4. The heat dissipation device assembly as claimed in claim 1, wherein the fan is mounted on the conductive core of the heat sink and surrounded by the fan cover at the second open end. 5. The heat dissipation device assembly as claimed in claim 1, wherein the fan is mounted to the fan cover and located inside of the fan cover at the second open end. 6. The heat dissipation device assembly as claimed in claim 5, wherein the fan cover forms an annular flange supporting the fan thereon. 7. The heat dissipation device assembly as claimed in claim 6, wherein the fan includes a bracket defining a plurality of grooves and the fan cover forms a plurality of ribs received in the grooves respectively, the ribs being perpendicular to the flange. 8. The heat dissipation device assembly as claimed in claim 1, wherein the fan is mounted to the second open end and located outside of the fan cover. 9. A heat dissipation device assembly comprising: a heat sink comprising a conductive core and a plurality of radiation fins arranged radially around the conductive core, pluralities of channels defined between the radiation fins; a fan cover housing the heat sink therein and defining along the central line thereof a first open end and a second open end opposite to the first open end, a plurality of elongated slots being defined in the fan cover and extending between the first open end and the second open end, the dimension of each slot in the direction substantially parallel to the central line being greater than that in the direction surrounding the central line; and a fan located at one of the first and the second open ends of the fan cover for providing airflow through the channels and the slots to outside of the fan cover. 10. The heat dissipation device assembly as claimed in claim 9, wherein the heat sink is adjacent to the first open end of the fan cover, the fan is mounted on the conductive core of the heat sink and adjacent to the second open end. 11. The heat dissipation device assembly as claimed in claim 10, wherein the slots defined in the fan cover surround the heat sink. 12. The heat dissipation device assembly as claimed in claim 9, wherein the fan is mounted to the fan cover and located inside thereof. 13. The heat dissipation device assembly as claimed in claim 9, wherein the fan further comprises a bracket defining a plurality of grooves, the fan cover defines an annular flange for preventing the fan from moving to the first open end, and a plurality ribs received respectively in the grooves of the bracket of the fan. 14. The heat dissipation device assembly as claimed in claim 9, wherein the fan is mounted to the fan cover and located outside thereof. 15. A heat dissipation device assembly comprising: a heat sink comprising a first end and a second end opposite to the first end, and a plurality of channels formed between the first and second ends; a fan cover surrounding the heat sink except the first and second ends and defining a plurality of elongated slots substantially parallel to the channels of the heat sink, the slots located between the first and second ends to allow the channels to communicate with outside of the fan cover; and a fan provided adjacent one of the first and second ends for creating airflow through the channels to outside of the fan cover. 16. The heat dissipation device assembly as claimed in claim 15, wherein the heat sink comprises a conductive core and a plurality of radiation fins arranged radially around the conductive core, pluralities of channels extending from the first end to the second end are defined between the radiation fins. 17. The heat dissipation device assembly as claimed in claim 15, wherein the fan is mounted on the heat sink adjacent to one of the open ends and surrounded by the fan cover. 18. The heat dissipation device assembly as claimed in claim 15, wherein the fan is mounted to the fan cover and adjacent to one open ends of the fan cover. 19. The heat dissipation device assembly as claimed in claim 18, wherein the fan is located inside of the fan cover. 20. The heat dissipation device assembly as claimed in claim 18, wherein the fan is located outside of the fan cover.