Glass manufacturing – Processes – With chemically reactive treatment of glass preform
Reexamination Certificate
2005-01-25
2005-01-25
Vincent, Sean (Department: 1731)
Glass manufacturing
Processes
With chemically reactive treatment of glass preform
C065S061000, C065S065000, C065S104000, C065S105000, C065S111000, C065S113000, C219S121600, C219S121610, C219S121660, C219S121760
Reexamination Certificate
active
06845635
ABSTRACT:
There are provided a method of manufacturing a glass substrate for information recording media that allows the inner and outer peripheral edge surfaces of the glass substrate for information recording media to be smoothed easily and inexpensively, a glass substrate for information recording media manufactured using this method, and an information recording medium using this glass substrate. A donut-shaped glass disk for information recording media having an outer peripheral edge surface and an inner peripheral edge surface is prepared. At least one of the outer peripheral edge surface and the inner peripheral edge surface of the glass disk is smoothed by melt-heating to a temperature at or above the softening point of the glass by irradiating with at least one laser beam. As a result, at least one of the outer peripheral edge surface and the inner peripheral edge surface of the glass disk becomes smooth and rounded, and hence a polishing step used in a conventional method can be omitted, and moreover chamfering in a grinding step can also be omitted.
REFERENCES:
patent: 3819349 (1974-06-01), Shimizu et al.
patent: 4803106 (1989-02-01), Lenhart et al.
patent: 5697998 (1997-12-01), Platus et al.
patent: 5725625 (1998-03-01), Kitayama et al.
patent: 6521862 (2003-02-01), Brannon
patent: 20020121110 (2002-09-01), Saito et al.
patent: 20020197437 (2002-12-01), Hashimoto et al.
patent: 20030003763 (2003-01-01), Kurachi et al.
patent: 20030109202 (2003-06-01), Matsuno et al.
patent: 20030110803 (2003-06-01), Saito et al.
Jibiki Satoshi
Kezuka Masamichi
Matsuno Kensuke
Miwa Takao
Watanabe Takeo
Frishauf Holtz Goodman & Chick P.C.
Hoya Corporation
Vincent Sean
LandOfFree
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