Crystallized glass for information recording medium, crystallized glass substrate, and information recording medium using the crystallized glass substrate
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United States of America Patent
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Sep 4, 2007
Grant Date -
Feb 23, 2006
app pub date -
Sep 7, 2005
filing date -
Mar 13, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Enclosed are crystallized glasses suitable for a substrate for an information recording medium such as a magnetic disc, optical disc, or optomagnetic disc, a substrate for information recording medium using such a crystallized glass substrate, and an information recording medium using such a substrate for information recording medium. The crystallized glasses are capable of providing a glass substrate having a high Young's modulus, as well as excellent mechanical strength, surface flatness, and heat resistance and having an excellent surface smoothness upon polishing. Glass substrate having an excellent surface smoothness using such a crystallized glass are also disclosed.
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