Patent ID: 6889756

Claim:
A high efficiency isothermal heat sink comprising: a plate body with a top and comprising a housing having an inner chamber under a vacuum and comprising a cover comprising an upper substrate having a bottom and an outer edge and an upper flange integrally formed on the bottom along the outer edge of the upper substrate; and a base attached to the upper flange of the cover and comprising a lower substrate having a top and an outer edge and a lower flange integrally formed on the top along the outer edge of the lower substrate and aligned with the upper flange of the cover; an interior partition mounted between the cover and the base and fastened between the upper flange and the lower flange to divide the inner chamber into an upper half chamber and a lower half chamber and having a central through hole and multiple air passages to allow the lower half chamber to communicate with the upper half chamber; and a wick containing a working fluid mounted on the top of the lower substrate, held in the central through hole in the interior partition and having a lower evaporating section on top of the lower substrate and an upper condensing section extending out of the central through hole in the interior partition, held in the upper half chamber and abutting the bottom of the upper substrate; wherein the working fluid in the lower evaporating section evaporates to produce a vapor in the lower half chamber, which flows into the upper half chamber through the air passages in the interior partition, the vapor condenses into a liquid that is directed into the upper condensing section where the working fluid in the upper condensing section returns to the lower evaporating section.