PH12012000200A1 - Process for producing glass substrate for magnetic recording medium, and glass substrate for magnetic recording medium - Google Patents
Process for producing glass substrate for magnetic recording medium, and glass substrate for magnetic recording mediumInfo
- Publication number
- PH12012000200A1 PH12012000200A1 PH1/2012/000200A PH12012000200A PH12012000200A1 PH 12012000200 A1 PH12012000200 A1 PH 12012000200A1 PH 12012000200 A PH12012000200 A PH 12012000200A PH 12012000200 A1 PH12012000200 A1 PH 12012000200A1
- Authority
- PH
- Philippines
- Prior art keywords
- polishing
- glass substrate
- recording medium
- magnetic recording
- principal planar
- Prior art date
Links
Landscapes
- Manufacturing Of Magnetic Record Carriers (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Grinding Of Cylindrical And Plane Surfaces (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
- Surface Treatment Of Glass (AREA)
- Magnetic Record Carriers (AREA)
Abstract
To provide a process for producing a glass substrate for a magnetic recording medium excellent in smoothness of principal planar surfaces with little variation in thickness among different lots of glass substrate, by preventing clogging of a polishing pad in a principal planar surface-polishing step thereby to reduce frequency of dressing treatment and to stabilize the polishing rate. This process for producing a glass substrate for a magnetic recording medium, comprises a shaping step of processing a glass base plate into a disk-shaped glass substrate having a circular hole in the center, a principal planar surface-polishing step of polishing planar surfaces of the glass substrate, and a cleaning step of cleaning the glass substrate, wherein the principal planar surface-polishing step includes a rough-polishing step of polishing the principal planar surfaces of the glass substrate in a polishing depth (removal amount) of at least 5 µm in total thickness of both surfaces, and the rough-polishing step is a step of polishing the principal planar surfaces of the glass substrate by using a polishing pad which internally contains foams, the average diameter of the foams that are open at the polishing surface being from 80 to 300 µm, and which has a compressibility of from 1.1 to 2.5%, and a polishing slurry containing abrasive grains.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011159895A JP5768554B2 (en) | 2011-07-21 | 2011-07-21 | Manufacturing method of glass substrate for magnetic recording medium and glass substrate for magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| PH12012000200A1 true PH12012000200A1 (en) | 2014-03-03 |
Family
ID=47530513
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PH1/2012/000200A PH12012000200A1 (en) | 2011-07-21 | 2012-07-16 | Process for producing glass substrate for magnetic recording medium, and glass substrate for magnetic recording medium |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP5768554B2 (en) |
| CN (1) | CN102886730A (en) |
| PH (1) | PH12012000200A1 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6330628B2 (en) * | 2013-11-11 | 2018-05-30 | 旭硝子株式会社 | Manufacturing method of glass substrate |
| US10946495B2 (en) * | 2015-01-30 | 2021-03-16 | Cmc Materials, Inc. | Low density polishing pad |
| JP6234957B2 (en) * | 2015-04-20 | 2017-11-22 | 信越半導体株式会社 | Epitaxial wafer manufacturing method |
| JP6843548B2 (en) * | 2016-08-10 | 2021-03-17 | 富士紡ホールディングス株式会社 | Polishing pad and its manufacturing method |
| CN109909868B (en) * | 2019-04-23 | 2023-11-21 | 蚌埠中光电科技有限公司 | TFT-LCD glass surface grinding device and method |
| CN121171268A (en) | 2024-06-19 | 2025-12-19 | 西部数据技术公司 | Method and apparatus for identifying a substrate suitable for use in a magnetic recording medium |
| WO2026016210A1 (en) * | 2024-07-18 | 2026-01-22 | 中建材玻璃新材料研究院集团有限公司 | Preparation process for high-generation tft-lcd glass substrate |
| CN121156906A (en) * | 2025-10-31 | 2025-12-19 | 安徽尤品新材料有限公司 | Diamond grinding disc device and system thereof |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100537147C (en) * | 2000-12-01 | 2009-09-09 | 东洋橡膠工业株式会社 | Polishing pad, manufacturing method thereof, and buffer layer for polishing pad |
| JP4234991B2 (en) * | 2002-12-26 | 2009-03-04 | Ｈｏｙａ株式会社 | Manufacturing method of glass substrate for information recording medium and glass substrate for information recording medium manufactured by the manufacturing method |
| JP2007160474A (en) * | 2005-12-15 | 2007-06-28 | Nitta Haas Inc | Polishing cloth and its manufacturing method |
| JP2009050920A (en) * | 2007-08-23 | 2009-03-12 | Asahi Glass Co Ltd | Manufacturing method of glass substrate for magnetic disk |
| WO2009096294A1 (en) * | 2008-01-30 | 2009-08-06 | Asahi Glass Co., Ltd. | Process for producing glass substrate for magnetic disk |
| JP2009279696A (en) * | 2008-05-21 | 2009-12-03 | Furukawa Electric Co Ltd:The | Method of manufacturing glass substrate |
| JP5365522B2 (en) * | 2008-07-03 | 2013-12-11 | 旭硝子株式会社 | Glass substrate polishing method and manufacturing method |
| JP5233621B2 (en) * | 2008-12-02 | 2013-07-10 | 旭硝子株式会社 | Glass substrate for magnetic disk and method for producing the same. |
| JP5407693B2 (en) * | 2009-09-17 | 2014-02-05 | 旭硝子株式会社 | Glass substrate manufacturing method, polishing method and polishing apparatus, and glass substrate |
| JP2011104691A (en) * | 2009-11-16 | 2011-06-02 | Asahi Glass Co Ltd | Glass substrate for magnetic disk, method for manufacturing the same, and magnetic disk |
-
2011
- 2011-07-21 JP JP2011159895A patent/JP5768554B2/en not_active Expired - Fee Related
-
2012
- 2012-07-16 PH PH1/2012/000200A patent/PH12012000200A1/en unknown
- 2012-07-20 CN CN2012102539845A patent/CN102886730A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JP5768554B2 (en) | 2015-08-26 |
| JP2013025844A (en) | 2013-02-04 |
| CN102886730A (en) | 2013-01-23 |
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