Patent ID: 7684198

Claim:
A stacked heat-transfer interface structure comprising a circuit board carrying a plurality of heat generating electronic devices that have different heights, and a heat dissipation module, said heat dissipation module comprising a heat plate and at least one first heat transfer device and at least one second heat transfer device respectively mounted on said heat plate and respectively attached to said heat generating electronic devices of said circuit board for carrying heat away from said heat generating electronic devices of said circuit board, wherein: each said first heat transfer device comprises a first heat-transfer sheet member disposed at a top side, a second heat-transfer sheet member disposed at a bottom side, and a heat-transfer block sandwiched between said first heat-transfer sheet member and said second heat-transfer sheet member, said first heat-transfer sheet member being made of a material having a high heat conductivity and a low thermal resistance and a vertical heat transfer characteristic, said first heat-transfer sheet member being directly bonded to one said heat generating electronic device of said circuit board, said heat-transfer block being made of a metal material having horizontal and vertical heat transfer characteristics for spreading heat energy from said first heat-transfer sheet member onto said second heat-transfer sheet member, said second heat-transfer sheet member being made of an elastic material having a low heat conductivity, a high thermal resistance, a vertical heat transfer characteristic and a thickness greater than said first heat-transfer sheet member such that when said first heat-transfer sheet member is attached to the respective heat generating electronic device of said circuit board, said second heat-transfer sheet member is elastically deformed to compensate for the height difference of the respective heat generating electronic device relative to the other heat generating electronic devices of said circuit board for transferring heat energy vertically to said heat plate for dissipation; each said second heat transfer device is mounted on said heat plate of said heat dissipation module, having a thickness greater than said at least one first heat transfer device; the heat generating electronic devices of said circuit board include at least one first heat generating electronic device respectively attached to the at least one first heat transfer device of said heat dissipation module and at least one second heat generating electronic device respectively attached to the at least one second heat transfer device of said heat dissipation module, said at least one second heat generating electronic device having a lower heat generating effect relative to said first heat generating electronic device.