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

1978-09-21

1980-07-08

Tufariello, T. M.

Chemistry: electrical and wave energy

Processes and products

204 6, C25D 110, C25D 120

Patent

active

042116171

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.

REFERENCES:
patent: 1930826 (1933-10-01), Scott
patent: 2075646 (1937-03-01), Hewitt
patent: 2530842 (1950-11-01), Ruggieri
patent: 3894179 (1975-07-01), Jacobs
patent: 3954469 (1976-05-01), Avanzado
On Printing Motion, by Kramer, et al., Reprinted from Eduology, vol. 4, Issue 1 (1973).

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