Method for manufacturing substantially flat dies

Claim 1

Method for manufacturing substantially flat dies or similar, particularly a die or counterpart for gramophone records, which are essentially comprised of a part made from a low electric conductivity material which has been previously metallized, including introducing said part into a metal salt-based electrolyte in such a way that said part forms the cathode, the feeding of a relatively low electric current through said electrolyte between said cathode and an anode mounted inside said electrolyte some distance away from the cathode, the adjusting of the current to form by electroplating a deposit with a suitable thickness from said metal which is contained in said electrolyte, on said part, in which said electric current strength is adjusted by varying the spacing between the cathode and the anode inside the electrolyte proper, in which the spacing between the cathode-forming part and the anode is decreased continuously without influencing the electric voltage at the anode and cathode terminals during said closing operation, and maintaining the faces of the substrate and the anode substantially parallel to each other.