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US 5,400,317 AGranted
Method of coating a workpiece of a plastic material by a metal layer
AssigneesBalzers Aktiengesellschaft, Producers Color Service, Inc.
InventorsGregor Strasser, Michael Hennessey
Life of this patent
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Abstract
An optical storage disk has a body made of PMMA bulk material with a surface of PMMA. Aluminum or an aluminum alloy, light reflecting layer coats the PMMA surface and is applied using a sputtering apparatus in a sealed gas atmosphere containing argon and carbon containing gas. Application of the coating using sputtering takes place immediately after the PMMA body is inserted into the sealed gas atmosphere and without any pretreatment to the PMMA surface.
Claims9
A method of making an optical storage disk comprising:
- providing a disk body of PMMA bulk material having a surface of the same PMMA bulk material;
- and
- applying a coating of one of aluminum and an aluminum alloy acting as a light reflecting layer, and as a first layer, directly on the surface of said PMMA body to form a coated body, by a sputtering process in a sputtering apparatus, the sputtering process taking place in one of a DC-, RF-, and DC- with superimposed AC- discharge, with a magnetic field applied during the process to form one of a tunnel-shaped pattern of magnetic field flux on and adjacent a surface of a material to be sputtered, and of a flux pattern between the surface of the material to be sputtered and other parts of the sputtering apparatus, the coating further being applied in a sealed gas atmosphere containing argon and a carbon containing gas in the sputtering apparatus during the sputtering process, said coating being applied on the PMMA surface of said PMMA body by means of inserting said body with said PMMA surface into said sealed gas atmosphere, and immediately igniting said discharge and starting said sputtering process without pretreatment to said PMMA body surface in said sputtering apparatus.
Dependencies are inferred from the claim text.