Process for producing a stamper for videodisc purposes
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United States of America Patent
Stats
-
Jul 8, 1980
Issued Date -
N/A
app pub date -
Sep 21, 1978
filing date -
Feb 24, 1975
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
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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