Method for electroforming a replica on a record matrix
AssigneeRCA Corporation
InventorWilliam C. Brooks
Life of this patent
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Abstract
An improved method is provided for the manufacture of records, molds, and stampers in which the matrix on which the molds and stampers are electroformed is subjected to demagnetization prior to electroforming to prevent tramp metal particles from adhering to the surface of the matrix and thereby causing microdefects in the electroformed parts.
Claims6
In a method for manufacture of record molding stampers wherein a replica is formed by electroplating a metal on a matrix made of magnetizable metallic material, the improvement which comprises subjectng the matrix to demagnetization until the matrix is free of zones of magnetism prior to electroforming the metal on the matrix.
Dependencies are inferred from the claim text.