PH12012000400A1 - Glass substrate for magnetic recording medium and magnetic recording medium - Google Patents
Glass substrate for magnetic recording medium and magnetic recording mediumInfo
- Publication number
- PH12012000400A1 PH12012000400A1 PH12012000400A PH12012000400A PH12012000400A1 PH 12012000400 A1 PH12012000400 A1 PH 12012000400A1 PH 12012000400 A PH12012000400 A PH 12012000400A PH 12012000400 A PH12012000400 A PH 12012000400A PH 12012000400 A1 PH12012000400 A1 PH 12012000400A1
- Authority
- PH
- Philippines
- Prior art keywords
- recording medium
- magnetic recording
- glass substrate
- load
- anelasticity
- Prior art date
Links
Landscapes
- Magnetic Record Carriers (AREA)
- Manufacturing Of Magnetic Record Carriers (AREA)
Abstract
The invention has an objective to provide a glass substrate for a magnetic recording medium, having a low incidence of errors when used as the magnetic recording medium, and a magnetic recording medium using the glass substrate for a magnetic recording medium. THe invention provides a glass substrate for a magnetic recording medium, in which when an absolute value of a difference between a flatness determined by supporting both diametrically opposing edge portions of the glass substrate for a magnetic recording medium from an underside surface thereof, applying a load on an upper surface of a central portion of the glass substrate for a magnetic recording medium for 48 hours, followed by removing the load, and performing measurement at a time when 5 hours have elapsed since the removal of the load, and a flatness before applying the load is defined as an anelasticity deformation amount A, the anelasticity deformation amount A us 4.2 um or less.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2011282327A JP5310834B2 (en) | 2011-12-22 | 2011-12-22 | Glass substrate for magnetic recording medium and magnetic recording medium |
Publications (2)
Publication Number | Publication Date |
---|---|
PH12012000400A1 true PH12012000400A1 (en) | 2015-02-23 |
PH12012000400B1 PH12012000400B1 (en) | 2015-02-23 |
Family
ID=48632555
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PH12012000400A PH12012000400B1 (en) | 2011-12-22 | 2012-12-21 | Glass substrate for magnetic recording medium and magnetic recording medium |
PH12013000297A PH12013000297A1 (en) | 2011-12-22 | 2013-10-02 | Glass substrate for magnetic recording medium and magnetic recording medium |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PH12013000297A PH12013000297A1 (en) | 2011-12-22 | 2013-10-02 | Glass substrate for magnetic recording medium and magnetic recording medium |
Country Status (4)
Country | Link |
---|---|
JP (1) | JP5310834B2 (en) |
CN (2) | CN103172276B (en) |
PH (2) | PH12012000400B1 (en) |
SG (2) | SG191513A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5920403B2 (en) * | 2013-06-21 | 2016-05-18 | 旭硝子株式会社 | Method for manufacturing magnetic recording medium and magnetic recording medium |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101417861A (en) * | 2007-10-26 | 2009-04-29 | 旭硝子株式会社 | Glass for information recording media substrate, glass substrate for magnetic disk and magnetic disk |
JP2011040145A (en) * | 2009-07-17 | 2011-02-24 | Ohara Inc | Method for manufacturing substrate for information storage medium |
US8603350B2 (en) * | 2009-07-17 | 2013-12-10 | Ohara Inc. | Method of manufacturing substrate for information storage media |
JP5662423B2 (en) * | 2010-03-31 | 2015-01-28 | Hoya株式会社 | Method for producing glass blank for magnetic recording medium glass substrate, method for producing magnetic recording medium glass substrate, and method for producing magnetic recording medium |
-
2011
- 2011-12-22 JP JP2011282327A patent/JP5310834B2/en not_active Expired - Fee Related
-
2012
- 2012-12-12 SG SG2012091484A patent/SG191513A1/en unknown
- 2012-12-12 SG SG2013074836A patent/SG194411A1/en unknown
- 2012-12-21 CN CN201210560842.3A patent/CN103172276B/en not_active Expired - Fee Related
- 2012-12-21 CN CN201310482024.0A patent/CN103626406B/en not_active Expired - Fee Related
- 2012-12-21 PH PH12012000400A patent/PH12012000400B1/en unknown
-
2013
- 2013-10-02 PH PH12013000297A patent/PH12013000297A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
CN103172276B (en) | 2016-08-03 |
JP5310834B2 (en) | 2013-10-09 |
CN103626406B (en) | 2016-04-27 |
JP2013131281A (en) | 2013-07-04 |
CN103172276A (en) | 2013-06-26 |
SG191513A1 (en) | 2013-07-31 |
PH12012000400B1 (en) | 2015-02-23 |
PH12013000297A1 (en) | 2015-05-11 |
CN103626406A (en) | 2014-03-12 |
SG194411A1 (en) | 2013-11-29 |
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