Patent ID: 6274225
Filing Date: 2001-08-14
Classification: H05K,Y10T

Abstract:
A rigid circuit member obtained by bending a composite laminate into a predetermined shape, the rigid circuit member comprising a circuit conductor made of a metal foil and interposed between plastic films having an elastic modulus ranging from about 450 kg/mm.sup.2 to about 550 kg/mm.sup.2, a thermal expansion coefficient of not more than 1.5.times.10.sup.-5 /.degree. C., a hygroscopic expansions coefficient of not more than 1.2.times.10.sup.-5 /%RH, and a water vapor permeability of not more than 15 g/m.sup.2 /mil day with an adhesive, wherein a polyethylene naphthalate film is used as the plastic film and wherein the rigid circuit member substantially retains the predetermined shape.