Patent ID: 6867974

Claim:
A heat-dissipating device comprising: a hollow heat-transfer member adapted to be disposed on a heat-generating source and confining a vacuum sealed chamber therein; an amount of coolant medium contained in said vacuum sealed chamber for heat exchange; a plurality of heat-dissipating fins provided on said heat-transfer member; wherein said vacuum sealed chamber has a wider section, a narrower section, and a neck section between said wider and narrower sections, and neck section hampering movement of said coolant medium from said wider section to said narrower section when said heat-transfer member is tilted from an upright position, where said narrower section is disposed above said wider section; wherein said heat transfer member includes a base portion adapted to be disposed on the heat-generating source, and a post portion that extends from said base portion, said base portion confining said wider section and said neck section of said vacuum sealed chamber, said post portion confining said narrower section of said vacuum sealed chamber; and wherein said base portion has a contacting wall with an outer wall surface that is adapted to be disposed on the heat-generating source, and an inner wall surface that confronts said vacuum sealed chamber and that is formed with a coolant groove in fluid communication with said vacuum sealed chamber.