| 摘要 |
PURPOSE:To form an electroforming surface with high accuracy by coating a protective film having corrosion resistance to an electroplating soln. on a core material and subjecting the core material to electroplating then dissolving the core material. CONSTITUTION:The surface 1a of a core material 1 formed of an Al alloy which permits precision machining is optically polished and a protective film 2 of Pt, etc. having corrosion resistance to an electroplating soln. is coated on said surface 1a by vacuum deposition or the like. The material 1 on which the film 2 is coated is dipped in the electroplating soln. to form a plating layer 3 around the material 1. The circumference of the layer 3 is formed to a prescribed shape by machining and the material is further diagonally sliced to a thin sheet shape. The sheet is dipped in a dissolving soln. of NaOH, etc. to elute the material 1. An electroforming surface 2a having the surface condition equal to the surface condition of the surface 1 is thus obtd. The film 2 which has the property to be eluted together with the material 1 by the electrolyte is usable as well.
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