Patent ID: 6631756
Filing Date: 2003-10-14
Classification: H01L

Abstract:
A passive cooling device for dissipating heat from a component, comprising:a heat mass; a stem connected with and extending outward of the heat mass and symmetrically positioned about an axis of the heat mass, the stem including a diverter surface, an end face, and a plurality of stem fins that are spaced apart to define a stem slot therebetween that extends to the heat mass; a heat conductive base connected with the heat mass and including a mounting surface adapted to thermally connect the component with the heat mass; a plurality of vanes connected with the heat mass and spaced apart to define a primary slot therebetween that extends to the heat mass, each vane including at least one secondary slot therein that extends through a portion of the vane to define a plurality of fins in the vane, each vane including a top face, and an inner wall including a first non-planar portion extending from the stem and terminating at a first intermediate portion that extends to a second non-planar portion that terminates at the top face, the inner wall of all the vanes defining a chamber that surrounds the stem and including a cavitation section between the first non-planar portion and the stem, and an outer wall including a third non-planar portion extending from the base and terminating at a second intermediate portion that terminates at the top face; an air flow source for generating an air flow; and a duct for channeling the air flow between the air flow source and the passive cooling device, the duct including a first opening positioned adjacent to the top face and a second opening adapted to connect with the air flow source, and wherein heat is dissipated from the component by the air flow passing over the heat mass, the stem, the stem fins, the fins, and the vanes and flowing through the stem slots, the primary slots, and the secondary slots.