| 摘要 |
<p>1,000,269. Producing printed circuits by etching. HAYDON SWITCH INSTRUMENT Inc. Dec. 30, 1963 [March 26, 1963], No. 51127/63. Heading B6J. [Also in Division B3] In a method of producing a printed circuit by etching, the metal foil 30, Fig. 3, is first etched part-way through its thickness from both sides to leave a web portion 41. This web portion has sufficient strength to prevent the foil from breaking up. An insulating member 48 and a support member 52, as in Fig. 5, is then applied to one of the etched surfaces of two similar foils. The assembly is then finally etched to produce the printed circuit, as shown in cross-section in Fig. 6. Fig. 1 illustrates a disc type rotor for a D.C. motor having printed circuit windings and commutator segments as produced by the above method. Fig. 7 illustrates a spot-welding technique for forming a connection between conductive path portions on opposite sides of a laminate construction, and a similar connection may be made by riveting. Fig. 11 illustrates various three-dimensional forms and design projections made practical by the above method, since the conductive paths of a printed circuit so produced are formed with conductors having substantially thicker cross-sections than those produced by prior methods.</p> |
