PH12012000363B1 - 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 medium

Info

Publication number
PH12012000363B1
PH12012000363B1 PH12012000363A PH12012000363A PH12012000363B1 PH 12012000363 B1 PH12012000363 B1 PH 12012000363B1 PH 12012000363 A PH12012000363 A PH 12012000363A PH 12012000363 A PH12012000363 A PH 12012000363A PH 12012000363 B1 PH12012000363 B1 PH 12012000363B1
Authority
PH
Philippines
Prior art keywords
recording medium
magnetic recording
glass substrate
main surfaces
less
Prior art date
Application number
PH12012000363A
Other versions
PH12012000363A1 (en
Inventor
Otsuka Haruhiko
Original Assignee
Asahi Glass Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Asahi Glass Co Ltd filed Critical Asahi Glass Co Ltd
Publication of PH12012000363B1 publication Critical patent/PH12012000363B1/en
Publication of PH12012000363A1 publication Critical patent/PH12012000363A1/en

Links

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.
PH12012000363A 2011-11-22 2012-11-19 Glass substrate for magnetic recording medium, and magnetic recording medium using glass substrate for magnetic recording medium PH12012000363A1 (en)

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 true PH12012000363B1 (en) 2015-01-21
PH12012000363A1 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 (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5860173B2 (en) * 2012-12-29 2016-02-16 Hoya株式会社 Glass substrate for magnetic disk and magnetic disk
WO2014104377A1 (en) * 2012-12-31 2014-07-03 Hoya株式会社 Method for manufacturing glass substrates for magnetic disks and method for manufacturing magnetic disks
JP6156967B2 (en) * 2013-04-30 2017-07-05 Hoya株式会社 Glass substrate manufacturing method, magnetic disk manufacturing method, and glass substrate end surface polishing apparatus
KR20190113979A (en) * 2017-02-24 2019-10-08 코닝 인코포레이티드 Method for producing dome or ball shape glass and dome or ball shape glass
JP6467118B1 (en) * 2017-06-30 2019-02-06 Hoya株式会社 Magnetic disk substrate and magnetic disk
US10872635B2 (en) * 2017-08-31 2020-12-22 Hoya Corporation Spacer and hard disk drive apparatus
JP7553280B2 (en) * 2020-08-07 2024-09-18 Tdk株式会社 Magnetic sensor and manufacturing method thereof
JP7856369B2 (en) * 2020-08-07 2026-05-11 Tdk株式会社 Magnetic sensor and method for manufacturing the same
US20240371404A1 (en) * 2021-08-26 2024-11-07 Furukawa Electric Co., Ltd. Substrate for magnetic disk, manufacturing method thereof, and magnetic disk

Family Cites Families (5)

* Cited by examiner, † Cited by third party
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
JP5719785B2 (en) * 2010-02-04 2015-05-20 Hoya株式会社 GLASS SUBSTRATE FOR INFORMATION RECORDING MEDIUM, INFORMATION RECORDING MEDIUM, AND INFORMATION RECORDING DEVICE

Also Published As

Publication number Publication date
CN102820040A (en) 2012-12-12
SG190504A1 (en) 2013-06-28
JP5029777B1 (en) 2012-09-19
JP2013109806A (en) 2013-06-06
CN102820040B (en) 2016-04-27
PH12012000363A1 (en) 2015-01-21

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