Master for the duplication of sound recordings and process for its production
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United States of America Patent
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Sep 16, 1997
Grant Date -
N/A
app pub date -
Mar 15, 1996
filing date -
Mar 20, 1995
priority date (Note) -
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Abstract
A plate made of silicate glass (glass master) (3) is provided with a pressing surface (surface coat) carrying the sound recording in the form of raised contours formed from a photoresist (5) with a layer of primer (adhesion promotor) (4) to hold the photoresist layer (5) to the glass plate (3). A first metal layer (6) is deposited on the photoresist (5) from a sputter target which consists of a NiV alloy; and a protective layer (7) of nickel is electrolytically deposited on the first layer. The metal master (8) consisting of first layer (6) and protective layer (7) is pulled from the photoresist layer (5).
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