Bridge clip with bimetallic leaf and method

Details Bridge clip with bimetallic leaf and method Bridge clip with bimetallic leaf and method

2005-05-17

2005-05-17

Martin, David (Department: 2841)

Electricity: electrical systems and devices

Housing or mounting assemblies with diverse electrical...

Support brackets

C439S073000, C361S801000

Reexamination Certificate

active

06894908

ABSTRACT:
A bridge clip with a leaf holds an integrated heat spreader on a die during curing. The leaf may have at least two metal portions with different coefficients of thermal expansion (CTE) to exert a changing force on the heat spreader over temperature. The die may be coupled to the heat spreader with a polymer interface material which is cured at an elevated temperature. In embodiments in which the die is located off-center under the heat spreader, the clip may exert an off-center force on the heat spreader when curing at the elevated temperature due to the differing CTEs. In other embodiments, in which the die is located toward the center of the heat spreader, a leaf with two layers having different CTEs may help reduce variable contact geometry, which may be especially helpful in higher force situations.

REFERENCES:
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patent: 5541525 (1996-07-01), Wood et al.
patent: 5634267 (1997-06-01), Farnworth et al.
patent: 6040702 (2000-03-01), Hembree et al.
patent: 6436223 (2002-08-01), Edwards et al.
patent: 6442026 (2002-08-01), Yamaoka
patent: 6462952 (2002-10-01), Ubukata et al.
patent: 6545352 (2003-04-01), Ruckdeschel

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