Self-balanced land grid array socket

Electrical connectors – Preformed panel circuit arrangement – e.g. – pcb – icm – dip,... – With provision to conduct electricity from panel circuit to...

Reexamination Certificate

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Reexamination Certificate

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10978007

ABSTRACT:
According to a first embodiment of the invention, a Land Grid Array (LGA) socket includes two sets of spring-loaded contacts, the contacts in the first set having an orientation opposite the contacts in the second set. Each set of contacts is positioned such that the total force and total moment of about the socket center by the wiping of the contacts is near zero. According to a second through fourth embodiment of the invention, a rectangular socket may be formed. According to these embodiments, the contacts are divided into four sets. Each set may have a different orientation, arranged so that the total force and moment are near zero.

REFERENCES:
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patent: 6752635 (2004-06-01), Searls et al.
patent: 6755668 (2004-06-01), Copper et al.
patent: 2004/0077202 (2004-04-01), Copper et al.
Disclosed Anonymously, Reduced stress pad pattern for ball grid array packages, Research Disclosure Journal, Kenneth Mason Publications Ltd. Sep. 1993, [online]. Research Disclosure, Database No. 353055; Journal No. 35355.
Disclosed Anonymously, An alternative pin layout to reduce CTE anisotropy and mismatch with FR-4, Research Disclosure Journal, Kenneth Mason Publications Ltd. Jan. 2000, [online]. Research Disclosure, Database No. 429033.
Lee Hymes, Circuits Assembly, San Francisco: Aug. 2003. vol. 14 Issue 8 p. 31. Retrieved [online] from: ProQuest, document ID 384594411.
Eric W. Weisstein, Eric Weisstein's World of Physics, 1996-2006, www.scienceworld.wolfram.com/physics/mechanics/forces.

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