Title:
INFORMATION RECORDING MEDIUM GLASS SUBSTRATE, AND MANUFACTURING METHOD OF INFORMATION RECORDING MEDIUM GLASS SUBSTRATE
Document Type and Number:
WIPO Patent Application WO/2014/002693
Kind Code:
A1
Abstract:
This manufacturing method of an information recording medium glass substrate is for manufacturing an information recording medium glass substrate which comprises a magnetic thin film layer formed on the primary surface of the glass substrate, and which is used in information recording mediums having a recording density on the magnetic recording surface of 600 Gbit/square inch or greater. When said information recording medium glass substrate has undergone alkali treatment involving immersion for 30 minutes in a pH11 sodium hydroxide solution at 40°C, the average SiOH/Si value on the primary surface of the glass substrate is 0.20-0.50.
Inventors:
SHIMAZU NORIKO (JP)
Application Number:
PCT/JP2013/065354
Publication Date:
January 03, 2014
Filing Date:
June 03, 2013
Export Citation:
Assignee:
KONICA MINOLTA INC (JP)
International Classes:
G11B5/73; G11B5/84
Domestic Patent References:
| WO2009157202A1 | 2009-12-30 |
Foreign References:
| JP2006063438A | 2006-03-09 | |||
| JP2006219349A | 2006-08-24 | |||
| JP2005522400A | 2005-07-28 | |||
| JP2010248071A | 2010-11-04 | |||
| JP2011232357A | 2011-11-17 |
Attorney, Agent or Firm:
Fukami Patent Office, p. c. (JP)
Patent business corporation Fukami patent firm (JP)
Patent business corporation Fukami patent firm (JP)
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