Glass substrate for magnetic recording medium, manufacturing method thereof, and magnetic recording medium incorporating the glass substrate
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
N/A
Issued Date -
Jul 12, 2001
app pub date -
Dec 20, 2000
filing date -
Dec 24, 1999
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A surface of a glass substrate is strengthened relative to a non-tempered bulk by heating the substrate to a temperature near its softening temperature, and then rapidly cooling the glass substrate. This process forms a compressive-stressed layer at the surface over the non-tempered bulk. The manufacture of a magnetic recording medium using the strengthened substrate is also disclosed.
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