PH12012000363A1 - Glass substrate for magnetic recording medium, and magnetic recording medium using glass substrate for magnetic recording medium - Google Patents
Glass substrate for magnetic recording medium, and magnetic recording medium using glass substrate for magnetic recording mediumInfo
- Publication number
- PH12012000363A1 PH12012000363A1 PH12012000363A PH12012000363A PH12012000363A1 PH 12012000363 A1 PH12012000363 A1 PH 12012000363A1 PH 12012000363 A PH12012000363 A PH 12012000363A PH 12012000363 A PH12012000363 A PH 12012000363A PH 12012000363 A1 PH12012000363 A1 PH 12012000363A1
- Authority
- PH
- Philippines
- Prior art keywords
- recording medium
- magnetic recording
- glass substrate
- main surfaces
- less
- Prior art date
Links
- 239000011521 glass Substances 0.000 title abstract 4
- 239000000758 substrate Substances 0.000 title abstract 4
- 238000006073 displacement reaction Methods 0.000 abstract 1
- 230000035939 shock Effects 0.000 abstract 1
Landscapes
- Magnetic Record Carriers (AREA)
- Holding Or Fastening Of Disk On Rotational Shaft (AREA)
- Glass Compositions (AREA)
- Manufacturing Of Magnetic Record Carriers (AREA)
Abstract
Provided is a glass substrate for a magnetic recording medium, which suppresses the fluttering displacement at the time when the magnetic recording medium is rotated at a high speed in the magnetic disk device ang also improves the shock resistance of the magnetic recording medium. A glass substrate for a magnetic recording medium of the invention has a disk shape, has a circular through hole at a center thereof and has one pair of main surfaces facing to each other, in which, in the main surfaces, a clamp area including a position to be fastened with a fastening member at the time when the magnetic recording medium is fixed to a hard disk drive has a flatness of 1 um or less and a thickness deviation of 0.3 um or less.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011255069A JP5029777B1 (en) | 2011-11-22 | 2011-11-22 | GLASS SUBSTRATE FOR MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING MEDIUM USING THE GLASS SUBSTRATE FOR MAGNETIC RECORDING MEDIUM |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| PH12012000363B1 PH12012000363B1 (en) | 2015-01-21 |
| PH12012000363A1 true PH12012000363A1 (en) | 2015-01-21 |
Family
ID=47016579
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PH12012000363A PH12012000363A1 (en) | 2011-11-22 | 2012-11-19 | Glass substrate for magnetic recording medium, and magnetic recording medium using glass substrate for magnetic recording medium |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP5029777B1 (en) |
| CN (1) | CN102820040B (en) |
| PH (1) | PH12012000363A1 (en) |
| SG (1) | SG190504A1 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107886972B (en) * | 2012-12-29 | 2019-12-06 | Hoya株式会社 | Glass substrate for magnetic disk and magnetic disk |
| CN104813396A (en) * | 2012-12-31 | 2015-07-29 | Hoya株式会社 | Method for manufacturing glass substrates for magnetic disks and method for manufacturing magnetic disks |
| CN105164752B (en) * | 2013-04-30 | 2018-09-14 | Hoya株式会社 | The end-face grinder of the manufacturing method of glass substrate for disc and the manufacturing method of disk and glass substrate for disc |
| KR20190113979A (en) * | 2017-02-24 | 2019-10-08 | 코닝 인코포레이티드 | Method for producing dome or ball shape glass and dome or ball shape glass |
| WO2019004484A1 (en) | 2017-06-30 | 2019-01-03 | Hoya株式会社 | Substrate for magnetic disks, and magnetic disk |
| US10872635B2 (en) * | 2017-08-31 | 2020-12-22 | Hoya Corporation | Spacer and hard disk drive apparatus |
| JP2022030805A (en) * | 2020-08-07 | 2022-02-18 | Tdk株式会社 | Magnetic sensor and method for manufacturing the same |
| CN117859177A (en) * | 2021-08-26 | 2024-04-09 | 古河电气工业株式会社 | Magnetic disk substrate, method for manufacturing same, and magnetic disk |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11296943A (en) * | 1998-04-08 | 1999-10-29 | Sony Corp | Disk substrate clamping device and clamping method |
| JP2001035110A (en) * | 1999-07-21 | 2001-02-09 | Sony Corp | Disk system evaluation apparatus and disk system evaluation method |
| JP2010080025A (en) * | 2008-09-29 | 2010-04-08 | Hoya Corp | Substrate for magnetic disk and magnetic disk |
| JP5454180B2 (en) * | 2010-02-02 | 2014-03-26 | 旭硝子株式会社 | Manufacturing method of glass substrate for magnetic recording medium and glass substrate for magnetic recording medium |
| WO2011096311A1 (en) * | 2010-02-04 | 2011-08-11 | コニカミノルタオプト株式会社 | Glass substrate for information recording medium, information recording medium, and information recording device |
-
2011
- 2011-11-22 JP JP2011255069A patent/JP5029777B1/en not_active Expired - Fee Related
-
2012
- 2012-07-10 CN CN201210238874.1A patent/CN102820040B/en active Active
- 2012-08-23 SG SG2012062675A patent/SG190504A1/en unknown
- 2012-11-19 PH PH12012000363A patent/PH12012000363A1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| PH12012000363B1 (en) | 2015-01-21 |
| JP2013109806A (en) | 2013-06-06 |
| JP5029777B1 (en) | 2012-09-19 |
| CN102820040A (en) | 2012-12-12 |
| CN102820040B (en) | 2016-04-27 |
| SG190504A1 (en) | 2013-06-28 |
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