Verfahren zur Herstellung gedruckter Schaltungen

摘要

994,930. Printed circuits. HUGHES AIRCRAFT CO. March 13, 1964 [March 25, 1963], No. 10824/64. Heading H1R. In a method of making a dimensionallystable printed circuit comprising etched conductors sealed between layers of flexible plastics material, layers 10, 12, Fig. 1, of liquefiable plastics fluorocarbon material such as a resinous copolymer of tetrafluoroethylene and hexafluoropropene are bonded to a layer 11 of glass cloth impregnated with a non- liquefiable plastics fluorocarbon material such as polytetrafluoroethylene at such temperature and pressure that the layers are mutually separable by peeling. An oxide-coated copper layer is permanently bonded to the layer 10 at the said temperature, and the conductive pattern 13, Fig. 6, is formed therein by etching, following the application of a positive resist by silk screening printing or photographic exposure. A laminate 101, 111, 121, identical with that of Fig. 1, is permanently bonded at the said temperature over the conductors 13 so that the latter are embedded in the integrated layers 10, 101; layers 11, 12, 111, 121 are finally stripped away. Alternatively, layers 10, 101, 12, 121 may be made of polytrifluoromonochloroethylene. Layers 12, 121 may be dispensed with at the expense of temporary curling, and layer 111 also may be omitted if a permanent curl is tolerable.