Patent ID: 7448438

Claim:
A heat pipe type heat dissipation device comprising: a base plate; a cover plate spaced from the base plate; a plurality of parallel fins extending between the base plate and the cover plate and connecting with them so as to define a plurality of unitary air passages; a fan mounted on a side of the plurality of parallel fins; and at least a heat pipe connecting the cover plate and the base plate; wherein the base plate has a protuberant portion, which has a convex surface facing towards the cover plate and has a thickness getting small from a middle to two sides of the protuberant portion in a direction parallel to that of the fins, the base plate having a portion extending beyond the plurality of parallel fins, the fan being located on the portion of the base plate; wherein the cover plate has a protuberant portion which has a convex surface facing towards the base plate and parallel to the protuberant portion of the base plate; wherein the at least a heat pipe comprises an evaporating section connected to the protuberant portion of the base plate, a condensing section connected to the protuberant portion of the cover plate, and an adiabatic section connecting the evaporating section and the condensing section; wherein the at least a heat pipe comprises two heat pipes, the cover plate defines two separate and parallel grooves for receiving the condensing sections of the heat pipes, the base plate defines two separate and parallel passages for receiving the evaporating sections of the heat pipes, a space between the grooves of the cover plate is greater than that between the passages of the base plate; and wherein the two protuberant portions are formed in middle portions of the base plate and the cover plate in a direction of extension of the fins, one of the two grooves extending along the protuberant portion of the cover plate, another one of the two grooves being located away from the protuberant portion of the cover plate.