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US 2004/0166446 A1Published application
Method for manufacturing metal master of information recording disc and metal master
AssigneeTDK Corporation
InventorYuuichi Kawaguchi
Life of this patent
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Abstract
A metal master having higher shape precision than conventional ones and a method for manufacturing such metal master are provided. The metal master has a conductive film having a thickness of about 50 nm (that is within a range of 35 to 200 nm).
Claims19
A method for manufacturing a metal master comprising the steps of:
- forming a conductive film by an electroless plating method on a glass master having fine depressions and protrusions for forming an information recording region of an information recording disc;
- forming an electrolytic plating layer by an electrolytic plating method on the conductive film;
- and
- removing the conductive film and the electrolytic plating layer from the glass master to provide a metal master, wherein
- the conductive film is formed to have a thickness of 35 to 200 nm.
2 more elements
A method for manufacturing a metal master comprising the steps of:
- forming a conductive film by an electroless plating method on a glass master having fine depressions and protrusions for forming an information recording region of an information recording disc;
- forming an electrolytic plating layer by an electrolytic plating method on the conductive film;
- and
- removing the conductive film and the electrolytic plating layer from the glass master to provide a metal master, wherein
- the conductive film is formed to have a thickness greater than a step height of the fine depressions and protrusions of the glass master.
2 more elements
A metal master comprising a conductive film having copied fine depressions and protrusions for forming an information recording region of an information recording disc, and an electrolytic plating layer formed on the conductive film, wherein
- the conductive film has a thickness in the range of 35 to 200 nm and is greater than a step height of the fine depressions and protrusions.
Dependencies are inferred from the claim text.