Patent ID: 6811467
Filing Date: 2004-11-02
Classification: B24B

Abstract:
A method of polishing at least one surface of a glass, ceramic, or glass-ceramic substrate to minimize the waviness, the variation in waviness, and the average surface roughness of said at least one surface, whereby said substrate is usable as a substrate for a magnetic or magneto-optical (MO) data/information storage retrieval medium, said method comprising sequential steps of(a) performing a primary polishing of said at least one surface of said substrate in a first polishing apparatus, utilizing a first polishing slurry containing particles of a first abrasive; (b) transferring said substrate to a second polishing apparatus; and (c) performing a final polishing of said at least one surface of said substrate in said second polishing apparatus, utilizing a second polishing slurry containing particles of a second abrasive, said particles of said second abrasive being smaller than said particles of said first abrasive.