Stress-resistant circuit board

Details Stress-resistant circuit board Stress-resistant circuit board

1994-12-30

1995-12-05

Thomas, Laura

Electricity: conductors and insulators

Conduits, cables or conductors

Preformed panel circuit arrangement

174250, 174258, 174260, 174266, 361750, H05K 103

Patent

active

054731194

ABSTRACT:
A circuit board resists shear stress caused by the unequal thermal coefficients of expansion of a mounted electronic component and a circuit board upon which it is mounted. The circuit board is defined by a support layer, a shear stress-relieving layer and a conductive layer. The shear stress-relieving layer comprises a layer of expanded polytetrafluoroethylene having a compressive modulus of less than 50,000 pounds per square inch.

REFERENCES:
patent: 3541222 (1970-11-01), Parks et al.
patent: 3934959 (1976-01-01), Gilissen
patent: 4194209 (1980-03-01), Coulbourn, Jr.
patent: 4547146 (1985-10-01), Yeh et al.
patent: 4755911 (1988-07-01), Suzuki
patent: 4991290 (1991-02-01), MacKay
patent: 5046953 (1991-09-01), Shreeve et al.
patent: 5049084 (1991-09-01), Bakke
patent: 5103293 (1992-04-01), Bonafino et al.

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