Substrate for information recording media and manufacturing...

Details Substrate for information recording media and manufacturing... Substrate for information recording media and manufacturing...

2006-06-27

2006-06-27

Vincent, Sean (Department: 1731)

Glass manufacturing

Processes

With wearing away of surface material

C065S099200, C451S041000, C451S042000, C451S057000

Reexamination Certificate

active

07065984

ABSTRACT:
A substrate for use as a disk substrate in a hard disk drive or the like, an information recording medium such as a magnetic disk, and a starting material glass plate which is a starting material of the substrate for information recording media. The forming conditions of the starting material glass plate are controlled such that the starting material glass plate has a long-wavelength waviness of not more than 6 nm. This starting material glass plate is polished so as to have a long-wavelength waviness of not more than 6 nm using CeO2abrasive grains having a mean grain diameter of not less than 0.0l μm and a 90% diameter of the volume grain size distribution of not less than 0.02 μm. The resulting substrate for an information recording medium has an excellent planarity, can be obtained in a short time and with a low polishing amount, and the resulting information recording medium is able to cope with increased data zone recording density.

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