Die for molding disc substrates
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United States of America Patent
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-
Mar 28, 2006
Grant Date -
Nov 18, 2004
app pub date -
Apr 23, 2004
filing date -
May 15, 2003
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A die for molding disc substrates, includes, in a stamper, a to-be-held surface that diverges continuously from an inner circumferential surface of a center hole. An inner stamper holder holding the inner circumferential side of the stamper includes a cylindrical body and a claw including a cavity forming surface substantially parallel to the inner circumferential side head surface, and a holding surface diverging tapered toward the cavity holding the to-be-held surface. In the cylindrical body portion, a cylindrical surface that is opposed to the inner circumferential surface of the stamper. The die prevents the claw of the inner stamper holder from projecting from a transfer surface of the stamper and solves a problem of insufficient strength of the inner circumferential side of the stamper.
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