Patent ID: 7804048
Filing Date: 2010-09-28
Classification: H01L

Abstract:
1. An apparatus for cooling a heat generating surface, the heat generating surface having a first thermal coefficient of expansion, comprising: a metal structure made from a metal having a second thermal coefficient of expansion that is different from the first thermal coefficient of expansion; and an enclosure disposed above the heat generating surface and around the metal structure, wherein the metal structure has a first side for attaching directly to the heat generating surface and a second side attached to a support sheet such that the metal structure is disposed between the support sheet and the heat generating surface, wherein the metal structure is configured to provide at least one of sufficiently small dimensions and sufficient flexibility for relieving mechanical stress arising from different thermal expansions of the heat generating surface and the metal structure, and wherein the metal structure has an attachment area with the heat generating surface that is substantially smaller than a total surface area of the metal structure.