| 摘要 |
1,247,991. Printed circuits. SHIPLEY CO. Inc. 13 May, 1969 [15 May, 1968], No. 24274/69. Heading H1R. [Also in Division C7] A printed circuit board which may be either a plastics, e.g. phenolic, sheet or a copper-clad plastics laminate is electroless plated at selected parts with e.g. Ni or Cu, by treating those parts, e.g. chemically, by mechanical roughening, or by applying a resist, to make them more retentive to a colloid, covering the substrate with a catalytic colloid, e.g. PdCl 2 , Au or Au-Pd, contacting the board with a stripper to remove the colloid from the untreated parts of the substrate and then electroless plating. The board may be subsequently electroplated with Cu and then a Pb-Sn alloy. The process may be used to deposit Cu on the through holes of a board.
|
