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US 4,103,102 AGranted
Reinforced flexible printed wiring board
AssigneeBell Telephone Laboratories, Incorporated
InventorTheodore Harold Klein
Life of this patent
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Abstract
An improved reinforced flexible printed wiring board is disclosed. The reinforcement in this printed wiring board is composed of a fabric woven from a yarn of plied continuous filaments of polyester and glass. The fabric is impregnated with an appropriate resin which is subsequently cured. This printed wiring board is found to have improved mechanical and thermal characteristics with little degradation in electrical properties.
Claims4
A reinforced flexible printed wiring board comprising a resin impregnated woven fabric upon which a metallic circuit configuration is defined:
- (a) said woven fabric comprising a yarn of at least one continuous glass fiber twisted relatively about at least one continuous polyester fiber with a periodicity between 0.1 and 10 twists per inch, said glass fiber coated with a lubricant;
- (b) said resin being a flexible resin which is at least partially cured, said resin impregnated fabric having insulation resistance greater than 1 .times. 10.sup.9 ohms, propagation tear strength greater than 0.5 pounds, and dimensional stability greater than 2 mils per inch;
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- (c) said metallic circuit configuration having a peel strength greater than three pounds per inch of conductor width.
1 more element
Dependencies are inferred from the claim text.