Electrode for electro-plating non-continuously conductive surfac

Chemistry: electrical and wave energy – Apparatus – Electrolytic

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Details

204277, 204297R, 204224R, C25B 1102, C25B 1104, C25D 1706, C25D 1712

Patent

active

046054839

ABSTRACT:
Apparatus for use as an electrode, which is particularly suited for use in electro-plating non-continuous conductive objects, particularly double-sided circuit boards, is described. Specifically, this electrode comprises: a housing having a plurality of sides and an internal enclosed air chamber, wherein at least one of the sides is flexible and conductive and the remaining sides are rigid and non-conductive; a port extending through one of the sides and into the chamber for routing a compressed fluid into the chamber; and means for holding a printed circuit board against the electrode such that whenever sufficient fluid is routed into the chamber the flexible side forceably distends into abutting electrical contact with a surface of the printed circuit board. Since the conductive side is electrically continuous over substantially all its surface area, whenever this side is distended and abuts against and establishes electrical contact with one side of a double-sided printed circuit board, plating current advantageously reaches substantially all the traces on that side of the board regardless of where these traces are actually situated. Thus, the same electrode can be used for plating a wide multitude of different printed circuit boards, thereby advantageously saving considerable time and expense.

REFERENCES:
patent: 3536603 (1970-10-01), Bonga
patent: 3835017 (1974-09-01), Mentone et al.
patent: 4202739 (1980-05-01), Csakvary et al.
patent: 4454009 (1984-06-01), Cockeram et al.

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