PROBLEM TO BE SOLVED: To realize the reduction in mass and the improvement in machinability and handleability by divided processing of only a shape transfer region by devising a method for duplication by electroforming excellent in shape transfer quality, an electroforming die structure of uniform electrodepositability, an inexpensive electroforming die making method, or the like.;SOLUTION: The mother die for module electroforming is one which is capable of being assembled from several blocks prepared by dividing a shape transfer region on which a fine pattern is formed and a region surrounding it and in which the shape transfer surface lies level to the blocks. Because the shape transfer region on which a fine pattern is formed is surrounded by other mother die blocks and the shape transfer region and the electroforming surface of the surrounding block form a level plane, the shape transfer region has no unlevelness around it. Therefore, concentrated deposition on the outer periphery of the shape transfer region does not occur and a plating layer uniform throughout the entire surface of the shape transfer region can be formed. As a result, the deterioration in transfer quality by concentrated deposition causing the warpage or deformation of the plating layer in the transfer region does not occur.;COPYRIGHT: (C)2003,JPO
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