PH12012000400A1 - Glass substrate for magnetic recording medium and magnetic recording medium - Google Patents

Glass substrate for magnetic recording medium and magnetic recording medium

Info

Publication number
PH12012000400A1
PH12012000400A1 PH12012000400A PH12012000400A PH12012000400A1 PH 12012000400 A1 PH12012000400 A1 PH 12012000400A1 PH 12012000400 A PH12012000400 A PH 12012000400A PH 12012000400 A PH12012000400 A PH 12012000400A PH 12012000400 A1 PH12012000400 A1 PH 12012000400A1
Authority
PH
Philippines
Prior art keywords
recording medium
magnetic recording
glass substrate
load
anelasticity
Prior art date
Application number
PH12012000400A
Other versions
PH12012000400B1 (en
Inventor
Raita Tasaki
Haruhiko Otsuka
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 PH12012000400A1 publication Critical patent/PH12012000400A1/en
Publication of PH12012000400B1 publication Critical patent/PH12012000400B1/en

Links

Landscapes

  • Magnetic Record Carriers (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)

Abstract

The invention has an objective to provide a glass substrate for a magnetic recording medium, having a low incidence of errors when used as the magnetic recording medium, and a magnetic recording medium using the glass substrate for a magnetic recording medium. THe invention provides a glass substrate for a magnetic recording medium, in which when an absolute value of a difference between a flatness determined by supporting both diametrically opposing edge portions of the glass substrate for a magnetic recording medium from an underside surface thereof, applying a load on an upper surface of a central portion of the glass substrate for a magnetic recording medium for 48 hours, followed by removing the load, and performing measurement at a time when 5 hours have elapsed since the removal of the load, and a flatness before applying the load is defined as an anelasticity deformation amount A, the anelasticity deformation amount A us 4.2 um or less.
PH12012000400A 2011-12-22 2012-12-21 Glass substrate for magnetic recording medium and magnetic recording medium PH12012000400B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2011282327A JP5310834B2 (en) 2011-12-22 2011-12-22 Glass substrate for magnetic recording medium and magnetic recording medium

Publications (2)

Publication Number Publication Date
PH12012000400A1 true PH12012000400A1 (en) 2015-02-23
PH12012000400B1 PH12012000400B1 (en) 2015-02-23

Family

ID=48632555

Family Applications (2)

Application Number Title Priority Date Filing Date
PH12012000400A PH12012000400B1 (en) 2011-12-22 2012-12-21 Glass substrate for magnetic recording medium and magnetic recording medium
PH12013000297A PH12013000297A1 (en) 2011-12-22 2013-10-02 Glass substrate for magnetic recording medium and magnetic recording medium

Family Applications After (1)

Application Number Title Priority Date Filing Date
PH12013000297A PH12013000297A1 (en) 2011-12-22 2013-10-02 Glass substrate for magnetic recording medium and magnetic recording medium

Country Status (4)

Country Link
JP (1) JP5310834B2 (en)
CN (2) CN103172276B (en)
PH (2) PH12012000400B1 (en)
SG (2) SG191513A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5920403B2 (en) * 2013-06-21 2016-05-18 旭硝子株式会社 Method for manufacturing magnetic recording medium and magnetic recording medium

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101417861A (en) * 2007-10-26 2009-04-29 旭硝子株式会社 Glass for information recording media substrate, glass substrate for magnetic disk and magnetic disk
JP2011040145A (en) * 2009-07-17 2011-02-24 Ohara Inc Method for manufacturing substrate for information storage medium
US8603350B2 (en) * 2009-07-17 2013-12-10 Ohara Inc. Method of manufacturing substrate for information storage media
JP5662423B2 (en) * 2010-03-31 2015-01-28 Hoya株式会社 Method for producing glass blank for magnetic recording medium glass substrate, method for producing magnetic recording medium glass substrate, and method for producing magnetic recording medium

Also Published As

Publication number Publication date
CN103172276B (en) 2016-08-03
JP5310834B2 (en) 2013-10-09
CN103626406B (en) 2016-04-27
JP2013131281A (en) 2013-07-04
CN103172276A (en) 2013-06-26
SG191513A1 (en) 2013-07-31
PH12012000400B1 (en) 2015-02-23
PH12013000297A1 (en) 2015-05-11
CN103626406A (en) 2014-03-12
SG194411A1 (en) 2013-11-29

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