Printed circuit board with a coverlay film
AssigneeJapan Gore-Tex, Inc.
InventorsSunao Fukutake, Kazuhiko Ohashi, Akira Urakami
Life of this patent
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Abstract
A printed circuit board assembly having a coverlay film which is a composite film consisting of a porous fluoropolymer film coated with a thermoplastic or heat-curing adhesive is disclosed. The coverlay film has excellent conformability and adhesion to the printed circuit board and low dielectric constant.
Claims14
A printed circuit board comprising a dielectric substrate with electrical conductors printed on its surface and having a protective coverlay film laminated to its outer printed surface, said coverlay film being a composite film comprising:
- a porous fluoropolymer film coated with a polymeric adhesive resin,
- said adhesive resin forming a coating layer on at least one surface of said porous fluoropolymer film,
- wherein said composite film is laminated over the surface of said conductors of said printed circuit and conforms closely to the surfaces of said conductors and to the surface of the substrate supporting said conductors,
- whereby the adhesive is in contact with and bonded to the surfaces of said conductors and said substrate, and excess adhesive is forced into the pores of said porous fluoropolymer film, thus minimizing lateral flow and segregation of said adhesive.
A printed circuit board comprising a dielectric substrate with electrical conductors printed on its surface and having a protective coverlay film laminated to its outer printed surface, said coverlay film being a composite film comprising:
- a porous fluoropolymer film having the surface region of at least one surface filled with a polymeric adhesive resin;
- wherein said composite film is laminated over the surface of said conductors of said printed circuit and conforms closely to the surfaces of said conductors and to the surface of the substrate supporting said conductors,
- whereby the adhesive contacts with and bonds to the surfaces of said conductors and said substrate without lateral flow and segregation of said adhesive.
Dependencies are inferred from the claim text.