Method of coating a workpiece of a plastic material by a metal layer
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United States of America Patent
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Mar 21, 1995
Grant Date -
N/A
app pub date -
Apr 1, 1993
filing date -
Apr 1, 1993
priority date (Note) -
Expired
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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.
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