SG151235A1 - Glass substrate for magnetic disc and manufacturing method thereof - Google Patents

Glass substrate for magnetic disc and manufacturing method thereof

Info

Publication number
SG151235A1
SG151235A1 SG200807236-5A SG2008072365A SG151235A1 SG 151235 A1 SG151235 A1 SG 151235A1 SG 2008072365 A SG2008072365 A SG 2008072365A SG 151235 A1 SG151235 A1 SG 151235A1
Authority
SG
Singapore
Prior art keywords
glass substrate
manufacturing
magnetic disc
chemical strengthening
main surface
Prior art date
Application number
SG200807236-5A
Inventor
Hiroshi Tsuchiya
Gosuke Ikemori
Original Assignee
Hoya Corp
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 Hoya Corp filed Critical Hoya Corp
Publication of SG151235A1 publication Critical patent/SG151235A1/en

Links

Abstract

GLASS SUBSTRATE FOR MAGNETIC DISC AND MANUFACTURING METHOD THEREOF A manufacturing method of a glass substrate for a magnetic disc according to the present invention includes steps of obtaining a glass substrate having at least a main surface and an edge surface, a substantially toric shape, carrying out chemical strengthening, and carrying out mirror polishing on the main surface so that ratio of thickness of the reinforcement stress layer to be removed (B) to the thickness of the reinforcement stress layer formed after the chemical strengthening (A) (B/A) X 100 becomes between 0.5 and 3% on the main surface and the edge surface of the glass substrate after chemical strengthening.
SG200807236-5A 2007-09-27 2008-09-26 Glass substrate for magnetic disc and manufacturing method thereof SG151235A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007252667A JP5210584B2 (en) 2007-09-27 2007-09-27 Manufacturing method of glass substrate for magnetic disk

Publications (1)

Publication Number Publication Date
SG151235A1 true SG151235A1 (en) 2009-04-30

Family

ID=40586524

Family Applications (1)

Application Number Title Priority Date Filing Date
SG200807236-5A SG151235A1 (en) 2007-09-27 2008-09-26 Glass substrate for magnetic disc and manufacturing method thereof

Country Status (2)

Country Link
JP (1) JP5210584B2 (en)
SG (1) SG151235A1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011021478A1 (en) * 2009-08-17 2011-02-24 コニカミノルタオプト株式会社 Method for manufacturing glass substrate, glass substrate, method for manufacturing magnetic recording medium, and magnetic recording medium
CN103562997A (en) * 2011-06-30 2014-02-05 Hoya株式会社 Glass substrate for magnetic disk and method for manufacturing same
JPWO2013099584A1 (en) * 2011-12-28 2015-04-30 Hoya株式会社 Manufacturing method of glass substrate for information recording medium
JP6520723B2 (en) * 2014-01-16 2019-05-29 Ａｇｃ株式会社 Method of producing chemically strengthened glass
WO2016117478A1 (en) * 2015-01-20 2016-07-28 旭硝子株式会社 Float glass
DE112016000397T5 (en) * 2015-01-20 2017-10-26 Asahi Glass Company, Limited Chemically tempered glass and manufacturing method therefor
CN108863107A (en) * 2016-04-22 2018-11-23 Ａｇｃ株式会社 Glass substrate for display
JP6288347B2 (en) * 2016-04-22 2018-03-07 旭硝子株式会社 Glass substrate for display

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10222842A (en) * 1997-02-04 1998-08-21 Nishimura Seiko Kk Manufacture of glass substrate for high recording density magnetic disk
JP2972830B1 (en) * 1998-08-31 1999-11-08 株式会社三井金属プレシジョン Method of manufacturing glass substrate for magnetic recording medium
JP2003146704A (en) * 2001-11-09 2003-05-21 Nippon Sheet Glass Co Ltd Apparatus for chemically strengthened glass substrate for information recording medium
JP2004055128A (en) * 2003-07-18 2004-02-19 Nippon Sheet Glass Co Ltd Manufacturing method of glass disk substrate for magnetic recording medium
JP4209316B2 (en) * 2003-12-12 2009-01-14 Ｈｏｙａ株式会社 Manufacturing method of glass substrate for information recording medium

Also Published As

Publication number Publication date
JP2009087408A (en) 2009-04-23
JP5210584B2 (en) 2013-06-12

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