Title: Process for stripping/coating conductive material and device thereof
Application Number: 98103160 Application Date: 1998.07.01
Publication Number: 1206754 Publication Date: 1999.02.03
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: C25D11/00;C25F5/00;H05K3/06
Applicant(s) Name: Deutscher Thomson-Brandt GmbH Address:
Inventor(s) Name: Hans O. Hale
Attorney & Agent: lu xiaozhang
Abstract:
    We are familiar with etching printed circuit boards chemically by providing a copper board with a mask and etching away chemically at those points where the mask is not present. This is disadvantageous, e.g. from environmental standpoints, because the chemical liquid is increasingly enriched with copper, and, when the liquid has been used, it can no longer be employed and is also difficult to dispose of. The invention is based on the object of providing a method of either applying or removing conductive material electrically. The inventive method of removing electrically conductive material from a printed circuit board having an etching mask, which covers the conductor structure, arranged on it is characterized by the fact that the following steps are carried out: a) the printed circuit board, together with an electrode, is placed in an electrolytic liquid, b) voltages of different potential are applied to the printed circuit board and the electrode, and c) electrically conductive material is removed from the printed circuit board.
Time: 6