Patent ID: 6418020
Filing Date: 2002-07-09
Classification: H01L

Abstract:
A heat dissipation device comprising:a thermally conductive base plate having a heat-accepting side surface that is adapted to abut against a heat generating member of an electronic device and that is adapted to be in thermal communication with the heat generating member, and a heat-dissipating side surface; a plurality of thermally conductive fin plates extending perpendicularly from and being in thermal communication with said heat-dissipating side surface of said base plate, each adjacent pair of said fin plates defining a channel therebetween, which is adapted to permit flow of cool air therethrough and which has an upstream end for introduction of the cool air, and a downstream end for discharge of the cool air, each of said fin plates having two opposite side surfaces, a proximate side that is proximate to said base plate, a distal side that is opposite to said proximate side, and a rib unit, which includes a plurality of generally straight integral ribs that are formed on said side surfaces of said fin plates, each of said fin plates being generally perpendicular to said heat-dissipating side surface of said base plate and extending from said proximate side to said distal side so as to permit transfer of a portion of heat from said base plate along said ribs from said proximate sides to said distal sides and so as to produce a turbulent flow of air at each of said ribs, thereby breaking a temperature boundary layer of the air flowing through each of said channels; a thermally conductive straight long spacer plate extending integrally and perpendicularly from and being in thermal communication with a middle portion of said heat-dissipating side surface of said base plate so as to define two generally rectangular half sections of said heat-dissipating side surface on two sides of said long spacer plate; two thermally conductive straight short spacer plates extending respectively, integrally and perpendicularly from and being in thermal communication with middle portions of said half sections of said heat-dissipating side surface, said short spacer plates being spaced apart from and being perpendicular to said long spacer plate so as to define two generally rectangular quarter sections of said heat-dissipating side surface on two sides of each of said short spacer plates; said fin plates being formed integrally on said quarter sections of said heat-dissipating side surface and having two integrally formed plate portions, which are respectively parallel to said long spacer plate and said short spacer plates and which are perpendicular to each other so that said proximate and distal sides of said fin plates are generally L-shaped, said plate portions of each of said fin plates defining a corner therebetween, which is formed with one of said ribs; and four adjacent pairs of intermediate plates, each of said adjacent pairs of which is disposed on a respective one of said quarter sections of said heat-dissipating side surface between an adjacent pair of said fin plates, each of said adjacent pairs of said intermediate plates being respectively parallel to said long spacer plate and said short spacer plates and being spaced apart from each other.