Method of manufacturing moulds for disc-shaped record carriers,

Details Method of manufacturing moulds for disc-shaped record carriers, Method of manufacturing moulds for disc-shaped record carriers,

1980-11-17

1982-06-22

Tufariello, T.

Chemistry: electrical and wave energy

Processes and products

204DIG7, C25D 110

Patent

active

043361129

ABSTRACT:
A method of manufacturing moulds for disc-shaped record carriers, and moulds manufactured by means of such a method.
A method of manufacturing moulds for disc-shaped record carriers where a glass plate which contains information and which comprises a central hole and is covered with a vapor-deposited silver layer is suspended in an electroforming bath by means of a suspension pin which contacts the edge of the central hole. The mould is electroformed by application of current via the suspension pin and a metallic strip arranged around the outer circumference. After this treatment, the plate is removed from the electroplating bath and the electroformed mould is removed from the plate.

REFERENCES:
patent: 2044431 (1936-06-01), Harrison
patent: 2372567 (1945-03-01), Graham
patent: 2675348 (1954-04-01), Greenspan

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