Method for manufacturing a molding tool used for substrate molding
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United States of America Patent
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Nov 9, 2004
Grant Date -
Jun 14, 2001
app pub date -
Dec 5, 2000
filing date -
Mar 27, 1998
priority date (Note) -
In Force
status (Latency Note)
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Abstract
The invention relates to methods for making mold tools. More particularly, the mold tools are used for molding a resin substrate which has fine pits, i.e., concavities and protuberances. The invention also pertains to a method for manufacturing a resin substrate. Such resin substrates may be used as an optical disk, a magnetic disk, a hard disk, etc., for recording data. According to a preferred embodiment of the invention, a first metallic (Ni) mold tool (father) is made which is a duplicate of a master substrate, then a resin mold tool (mother) is made which is a duplicate of the first metallic mold tool and finally a second metallic (Ni) mold tool (son) is made which is a duplicate of the resin mold tool. Both the father and son may be referred to a 'stamper'. The invention also relates to methods of manufacturing a mold tool for molding the base of an optical disk having at least one signal recording region and at least one non-signal recording region. The invention also relates to stampers used to make optical disks which have a signal recording region and a non-signal recording region.
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