Stamper and method for injection molding information bearing mem

Details Stamper and method for injection molding information bearing mem Stamper and method for injection molding information bearing mem

1984-05-16

1985-02-19

Tufariello, Thomas

Chemistry: electrical and wave energy

Processes and products

C25D 110, C25D 120

Patent

active

045003920

ABSTRACT:
An improved stamper and method involved in the replication of optically-readable information bearing members by means of an injection molding process utilizing a stamper having a conformal layer of chromium electrolytically deposited over the encoded surface of an existing optically-readable information bearing nickel stamper. Nickel stampers produce replicas having structural and optical defects affecting playability of the replica. The present invention provides improvement in the reduction or elimination of "plowing" and "orange peel" defects through cleaner release at the interface of the master stamper and the stamped article. The invention involves an improved stamper surface comprised of a thin layer of chromium metal deposited over an existing nickel stamper. Such a surface insures a cleaner release at the interface of the master stamper and stamped article.

REFERENCES:
patent: 2758961 (1956-08-01), Kosowsky
patent: 4305795 (1981-12-01), Weaver
patent: 4402798 (1983-09-01), Gorog
Metal Finishing Guidebook Directory, vol. 77, No. 13, Jan. 1979, pp. 188-190.

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