MY156113A - Glass substrate for magnetic recording medium and magnetic recording medium using the glass substrate for magnetic recording medium - Google Patents
Glass substrate for magnetic recording medium and magnetic recording medium using the glass substrate for magnetic recording mediumInfo
- Publication number
- MY156113A MY156113A MYPI2012002904A MYPI2012002904A MY156113A MY 156113 A MY156113 A MY 156113A MY PI2012002904 A MYPI2012002904 A MY PI2012002904A MY PI2012002904 A MYPI2012002904 A MY PI2012002904A MY 156113 A MY156113 A MY 156113A
- Authority
- MY
- Malaysia
- Prior art keywords
- recording medium
- magnetic recording
- glass substrate
- microwaviness
- area
- Prior art date
Links
- 239000000758 substrate Substances 0.000 title abstract 6
- 239000011521 glass Substances 0.000 title abstract 3
- 238000011156 evaluation Methods 0.000 abstract 5
- 230000002093 peripheral effect Effects 0.000 abstract 2
Landscapes
- Magnetic Record Carriers (AREA)
- Manufacturing Of Magnetic Record Carriers (AREA)
- Surface Treatment Of Glass (AREA)
Abstract
THE PRESENT INVENTION HAS AN OBJECT TO PROVIDE A GLASS SUBSTRATE FOR A MAGNETIC RECORDING MEDIUM IN WHICH, REGARDING THE ENTIRE SURFACE OF A RECORDING/REPRODUCING AREA, VARIATION OF MICROWAVINESS FALLS WITHIN A GIVEN RANGE, AND TO PROVIDE A MAGNETIC RECORDING MEDIUM USING THE GLASS SUBSTRATE FOR A MAGNETIC RECORDING MEDIUM. THE PRESENT INVENTION PROVIDES A GLASS SUBSTRATE FOR A MAGNETIC RECORDING MEDIUM, HAVING A PAIR OF MAIN SURFACES, AN OUTER PERIPHERAL SURFACE AND AN INNER PERIPHERAL SURFACE, IN WHICH AT LEAST ONE MAIN SURFACE IS THAT: WHEN MICROWAVINESS (nWq) IS MEASURED IN EACH LATTICE-SHAPED EVALUATION AREA SET TO ENTIRE SURFACE OF THE MAIN SURFACE INCLUDING ENTIRE SURFACE OF AN AREA TO BE A RECORDING/REPRODUCING AREA WHEN A MAGNETIC DISK HAS BEEN FORMED, AN ABSOLUTE VALUE OF VARIATION OF MICROWAVINESS (?nWq) BETWEEN ONE EVALUATION AREA (A) AND THE ADJACENT EVALUATION AREA (B), (C), (D) OR (E) IS THAT A RATIO (RATE OF CHANGE) TO MICROWAVINESS OF THE ONE EVALUATION AREA IS 10% OR LESS; AND A MEAN VALUE OF THE MICROWAVINESS (nWq) MEASURED IN THE EACH LATTICE-SHAPED EVALUATION AREA IS 0.080 NM OR LESS, AND PROVIDES A MAGNETIC RECORDING MEDIUM USING THE GLASS SUBSTRATE FOR A MAGNETIC RECORDING MEDIUM.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011226946A JP4977795B1 (en) | 2011-10-14 | 2011-10-14 | GLASS SUBSTRATE FOR MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING MEDIUM USING THE GLASS SUBSTRATE FOR MAGNETIC RECORDING MEDIUM |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| MY156113A true MY156113A (en) | 2016-01-15 |
Family
ID=46678874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| MYPI2012002904A MY156113A (en) | 2011-10-14 | 2012-06-25 | Glass substrate for magnetic recording medium and magnetic recording medium using the glass substrate for magnetic recording medium |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP4977795B1 (en) |
| CN (1) | CN102855888B (en) |
| MY (1) | MY156113A (en) |
| SG (1) | SG189605A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105849806B (en) * | 2013-12-26 | 2017-11-21 | Hoya株式会社 | Substrate for magnetic disk, magnetic disk and magnetic disk drive |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004253058A (en) * | 2003-02-20 | 2004-09-09 | Kao Corp | Polishing liquid composition |
| JP4707311B2 (en) * | 2003-08-08 | 2011-06-22 | 花王株式会社 | Magnetic disk substrate |
| JP4548140B2 (en) * | 2005-02-15 | 2010-09-22 | コニカミノルタオプト株式会社 | Glass substrate for magnetic recording media |
| CN101896972B (en) * | 2007-12-28 | 2013-01-30 | Hoya株式会社 | Glass substrate for magnetic disk, magnetic disk and method for manufacturing magnetic disk |
| JP4774466B1 (en) * | 2009-06-04 | 2011-09-14 | 株式会社オハラ | Crystallized glass substrate for information recording medium and manufacturing method thereof |
| JP5428793B2 (en) * | 2009-11-17 | 2014-02-26 | 旭硝子株式会社 | Glass substrate polishing method and method for producing glass substrate for magnetic recording medium |
-
2011
- 2011-10-14 JP JP2011226946A patent/JP4977795B1/en not_active Expired - Fee Related
-
2012
- 2012-06-19 SG SG2012045670A patent/SG189605A1/en unknown
- 2012-06-25 MY MYPI2012002904A patent/MY156113A/en unknown
- 2012-06-27 CN CN201210216094.7A patent/CN102855888B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN102855888A (en) | 2013-01-02 |
| JP2013089264A (en) | 2013-05-13 |
| SG189605A1 (en) | 2013-05-31 |
| JP4977795B1 (en) | 2012-07-18 |
| CN102855888B (en) | 2015-08-19 |
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