Patent ID: 7742302

Claim:
A heat-emitting element cooling apparatus comprising: a heat sink including a base with a heat-emitting element to be cooled mounted on a rear surface thereof and a heat radiation fin group comprising a plurality of radiation fins, fixed to said base; and an axial-flow fan unit arranged on said heat sink, for blowing air along at least said radiation fins constituting said radiation fin group to promote heat dissipation from said radiation fins; wherein said axial-flow fan unit comprises: a motor having a revolving shaft; an impeller having a plurality of blades and mounted on said revolving shaft; a cylindrical venturi for surrounding said impeller in a radial direction of said revolving shaft; and a plurality of webs spaced in a circumferential direction of said revolving shaft, for connecting said venturi to a housing of said motor; wherein a shape of said venturi is so defined that part of said blades located on a side of said housing of said motor can be seen as viewed from a radially outward direction; wherein each of said webs comprises: a web leg section extending from an end of said venturi toward a side of said housing of said motor, said web leg section having an inner surface continuous with an inner periphery surface of said venturi and curved along said inner periphery surface; and a web body located between said housing and an end of said web leg section on the side of said housing; and a shape of each of said blades is so defined that an angle between an edge of each of said blades and a virtual cylinder with which a radially outermost vertex of said edge of each of said blades is inscribed, becomes 4° or more.