Fremgangsmåde til fremstilling af elektriske komponenter i form af trykte kredsløb.

摘要

980,706. Printed circuits; inductors; electrodes for capacitors. PHOTOCIRCUITS CORPORATION. Oct. 17, 1961 [Nov. 3, 1960], No. 37145/61. Headings H1R and H1T. [Also in Division H2] A process for producing a printed circuit includes the steps of partially forming the conductors so as to leave a residual conductive web for supporting the conductors and finally etching away the web structure to leave the conductors. As described the process is applied to the production of a motor rotor comprising a plurality of radial conductive segments 12, 121 arranged adjacent to one another, each of the segments including external terminal sections 13, 131 and internal terminal sections 14, 141 provided with holes 23, 231 and 24, 241, respectively. A blank of sheet metal is stamped in a press so as to form the conductive segments 12, 121 and non-conducting regions 15 between them, the die only cutting part of the way through the sheet so as to leave a residual web 18 interconnecting the conductive segments. Two rotor discs thus formed are then placed with their faces opposing against opposite sides of an insulator 20, the grooves 15 between the conductors 12, 121 being in the interior adjacent the insulator 20. The assembly is then etched until the residual web 18 has been dissolved and each conductor 12 is separated and insulated from adjacent conductors 121. Plated through holes 23, 231, 24, 241 interconnect the conductors on opposite sides of the insulating material. In some cases the residual web is etched away prior to permanent assembly to the insulator, in which case the impressed pattern is temporarily mounted and pressed face downwards on a pressure-sensitive sheet in order to provide means for maintaining the conductive segments in position after removal of the residual web portion. To eliminate undercutting of the grooves before the residual web has been completely removed an etch resist may be sprayed on to the impressed face of the circuit configuration. In another embodiment the web section 18 may alternatively be mounted adjacent the insulator 20 and then removed by etching, Fig. 8 (not shown). The invention may be applied to the production of inductors and capacitor plates. Specification 874,394 is referred to.