Method of polishing a glass substrate for use as an...

Details Method of polishing a glass substrate for use as an... Method of polishing a glass substrate for use as an...

2003-12-25

2008-09-30

Eley, Timothy V (Department: 3724)

Abrading

Abrading process

Utilizing fluent abradant

C451S041000, C451S054000, C451S057000, C451S059000

Reexamination Certificate

active

07429209

ABSTRACT:
An information recording medium glass substrate manufactured by polishing the surface of a raw material glass plate. The polishing is divided into two steps, a step for performing a first polishing process to roughly polish the surface of the raw material glass plate to be smooth and a step for performing a second polishing process to finely polish the surface of the roughly polished raw material glass plate to be smoother. The second polishing process, using a polishing pad made of foam, is divided into two stages, pre-polishing with a polishing agent including abrasive grains of cerium oxide and post-polishing with a polishing agent including abrasive grains of silicon oxide. A rinsing process is performed between the pre-polishing and the post-polishing to rinse the raw material glass plate after the pre-polishing with a washing liquid to wash away the abrasive grains collected in the polishing pad in pre-polishing during the rinsing process.

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Japanese Office Action dated Jun. 10, 2008 for Japanese Patent Application 2004-562932.

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