Process for producing a stamper for videodisc purposes

Details Process for producing a stamper for videodisc purposes Process for producing a stamper for videodisc purposes

C - Chemistry, Metallurgy

25

D

204/4, 18/99

C25D 7/00 (2006.01) B81B 1/00 (2006.01) C25D 1/10 (2006.01) G11B 23/00 (2006.01)

Patent

CA 1070261

Abstract of the Disclosure A stamper for producing replicas of a video disc master formed of a glass substrate containing surface irregularities in the form of an information pattern of raised protrusions is formed by applying a strike coating of a conductive metal such as silver and then electroplating copper and nickel to form a self-supporting negative replica member, termed as "mother", which can be stripped from the surface of the master. The interior of the mother is cleaned and passivated preparatory to use as a mandrel in the electroforming of a positive replica submaster. The submaster may function as a stamper or be utilized after passivation as a mandrel in the electroforming of a submother from which a stamper or a plurality of stampers are formed.

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