MY156723A - Glass substrate for magnetic recording medium - Google Patents
Glass substrate for magnetic recording mediumInfo
- Publication number
- MY156723A MY156723A MYPI2012004256A MYPI2012004256A MY156723A MY 156723 A MY156723 A MY 156723A MY PI2012004256 A MYPI2012004256 A MY PI2012004256A MY PI2012004256 A MYPI2012004256 A MY PI2012004256A MY 156723 A MY156723 A MY 156723A
- Authority
- MY
- Malaysia
- Prior art keywords
- outer peripheral
- recording medium
- glass substrate
- magnetic recording
- peripheral side
- Prior art date
Links
- 239000000758 substrate Substances 0.000 title abstract 3
- 239000011521 glass Substances 0.000 title abstract 2
- 230000002093 peripheral effect Effects 0.000 abstract 8
- 230000003746 surface roughness Effects 0.000 abstract 3
- 238000005259 measurement Methods 0.000 abstract 1
Landscapes
- Manufacturing Of Magnetic Record Carriers (AREA)
- Magnetic Record Carriers (AREA)
Abstract
THE PRESENT INVENTION RELATES TO A GLASS SUBSTRATE FOR A MAGNETIC RECORDING MEDIUM, INCLUDING: A PAIR OF MAIN SURFACES; AN OUTER PERIPHERAL SURFACE; AND AN INNER PERIPHERAL SURFACE, IN WHICH THE OUTER PERIPHERAL SURFACE INCLUDES AN OUTER PERIPHERAL SIDE SURFACE PORTION AND AN OUTER PERIPHERAL CHAMFERED PORTION, IN THE OUTER PERIPHERAL SURFACE, WHEN A SURFACE ROUGHNESS Ra IS MEASURED AT A TOTAL OF 24 MEASUREMENT POINTS, PROVIDED AT INTERVALS OF 15 DEGREES IN CENTRAL ANGLE OF THE GLASS SUBSTRATE FOR A MAGNETIC RECORDING MEDIUM, A MAXIMUM VALUE OF THE SURFACE ROUGHNESS Ra OF THE OUTER PERIPHERAL SIDE SURFACE PORTION IS 0.5 µM OR LESS, AND A STANDARD DEVIATION OF THE SURFACE ROUGHNESS Ra OF THE OUTER PERIPHERAL SIDE SURFACE PORTION IS 0.2 µM OR LESS. (FIG. 3B)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011213463A JP5126401B1 (en) | 2011-09-28 | 2011-09-28 | Glass substrate for magnetic recording media |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| MY156723A true MY156723A (en) | 2016-03-15 |
Family
ID=47645655
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| MYPI2012004256A MY156723A (en) | 2011-09-28 | 2012-09-26 | Glass substrate for magnetic recording medium |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP5126401B1 (en) |
| CN (2) | CN102930874B (en) |
| MY (1) | MY156723A (en) |
| SG (2) | SG188835A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013146090A1 (en) * | 2012-03-30 | 2013-10-03 | Hoya株式会社 | Method for manufacturing glass substrate for magnetic disk |
| SG10201608631VA (en) * | 2013-02-22 | 2016-12-29 | Hoya Corp | Glass substrate for magnetic disk and magnetic disk |
| JP6020754B1 (en) * | 2015-12-25 | 2016-11-02 | 旭硝子株式会社 | Glass substrate for magnetic recording medium, magnetic recording medium |
| CN119596440A (en) * | 2020-03-13 | 2025-03-11 | 三菱化学株式会社 | Light guide plate and AR display |
| JP7459725B2 (en) * | 2020-08-27 | 2024-04-02 | 株式会社レゾナック | Dummy board and its manufacturing method |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3527075B2 (en) * | 1996-09-30 | 2004-05-17 | Ｈｏｙａ株式会社 | Glass substrate for magnetic recording medium, magnetic recording medium, and method for producing them |
| JPH11339098A (en) * | 1998-05-22 | 1999-12-10 | Nippon Conlux Co Ltd | Paper money processor |
| CN100550137C (en) * | 2005-07-08 | 2009-10-14 | 昭和电工株式会社 | Substrate for magnetic recording medium, and magnetic recording and reproducing apparatus |
| JP4545714B2 (en) * | 2005-07-08 | 2010-09-15 | 昭和電工株式会社 | Magnetic recording medium and magnetic recording / reproducing apparatus |
| US7727645B2 (en) * | 2005-07-08 | 2010-06-01 | Showa Denko K.K. | Substrate for magnetic recording medium, magnetic recording medium, and magnetic recording and reproducing apparatus |
| 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 |
| JP5056961B2 (en) * | 2010-02-01 | 2012-10-24 | 旭硝子株式会社 | Glass substrate for magnetic recording medium and method for manufacturing the same |
-
2011
- 2011-09-28 JP JP2011213463A patent/JP5126401B1/en not_active Expired - Fee Related
-
2012
- 2012-09-24 SG SG2013015284A patent/SG188835A1/en unknown
- 2012-09-24 SG SG2012070660A patent/SG188769A1/en unknown
- 2012-09-26 MY MYPI2012004256A patent/MY156723A/en unknown
- 2012-09-28 CN CN201210369825.1A patent/CN102930874B/en active Active
- 2012-09-28 CN CN201310224117.3A patent/CN103400588B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| SG188835A1 (en) | 2013-04-30 |
| CN102930874B (en) | 2016-03-09 |
| CN103400588B (en) | 2016-09-07 |
| JP2013073658A (en) | 2013-04-22 |
| SG188769A1 (en) | 2013-04-30 |
| CN102930874A (en) | 2013-02-13 |
| JP5126401B1 (en) | 2013-01-23 |
| CN103400588A (en) | 2013-11-20 |
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