Method of manufacturing printed wiring boards
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United States of America Patent
Stats
-
Dec 11, 1984
Grant Date -
N/A
app pub date -
Oct 27, 1983
filing date -
Oct 27, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An improved method of manufacturing a printed wiring board having the characteristics of one with a solder mask over bare copper for circuit traces and ground planes. The method includes the step of electroplating a very thin coating of tin-lead over the circuit traces, ground planes, holes and circuit pads prior to selectively coating only the pads and holes with a relatively thick coating of tin-lead solder plate. After removing the plating resist which defines the areas for selective solder coating, the board is chemically etched and then mechanically scrubbed to roughen the surface of and reduce the thickness of the thin solder plate. A solder mask may be applied over circuit traces and ground planes prior to reflowing the thick coating of solder plate. Assembled printed wiring boards may then be wave soldered without wrinkling of the solder mask.
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