PH12013000297A1 - Glass substrate for magnetic recording medium and magnetic recording medium - Google Patents
Glass substrate for magnetic recording medium and magnetic recording mediumInfo
- Publication number
- PH12013000297A1 PH12013000297A1 PH12013000297A PH12013000297A PH12013000297A1 PH 12013000297 A1 PH12013000297 A1 PH 12013000297A1 PH 12013000297 A PH12013000297 A PH 12013000297A PH 12013000297 A PH12013000297 A PH 12013000297A PH 12013000297 A1 PH12013000297 A1 PH 12013000297A1
- 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 object 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 is 4.2 mm 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 (1)
| Publication Number | Publication Date |
|---|---|
| PH12013000297A1 true PH12013000297A1 (en) | 2015-05-11 |
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 Before (1)
| 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 |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP5310834B2 (en) |
| CN (2) | CN103626406B (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 |
| US8603350B2 (en) * | 2009-07-17 | 2013-12-10 | Ohara Inc. | Method of manufacturing substrate for information storage media |
| JP2011040144A (en) * | 2009-07-17 | 2011-02-24 | Ohara Inc | Method for manufacturing substrate for information storage medium |
| SG184235A1 (en) * | 2010-03-31 | 2012-10-30 | Hoya Corp | Method of manufacturing glass blank for magnetic recording medium glass substrate, method of manufacturing magnetic recording medium glass substrate, and method of manufacturing 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 CN201310482024.0A patent/CN103626406B/en not_active Expired - Fee Related
- 2012-12-21 CN CN201210560842.3A patent/CN103172276B/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 |
|---|---|
| CN103172276A (en) | 2013-06-26 |
| PH12012000400A1 (en) | 2015-02-23 |
| SG191513A1 (en) | 2013-07-31 |
| CN103626406B (en) | 2016-04-27 |
| JP2013131281A (en) | 2013-07-04 |
| JP5310834B2 (en) | 2013-10-09 |
| PH12012000400B1 (en) | 2015-02-23 |
| CN103172276B (en) | 2016-08-03 |
| SG194411A1 (en) | 2013-11-29 |
| CN103626406A (en) | 2014-03-12 |
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