MY156723A - Glass substrate for magnetic recording medium - Google Patents

Glass substrate for magnetic recording medium

Info

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
Application number
MYPI2012004256A
Inventor
Daisuke Yoshimune
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 MY156723A publication Critical patent/MY156723A/en

Links

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)
MYPI2012004256A 2011-09-28 2012-09-26 Glass substrate for magnetic recording medium MY156723A (en)

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) CN103400588B (en)
MY (1) MY156723A (en)
SG (2) SG188769A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104137181A (en) * 2012-03-30 2014-11-05 Hoya株式会社 Method for manufacturing glass substrate for magnetic disk
US9595284B2 (en) * 2013-02-22 2017-03-14 Hoya Corporation 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
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)

* Cited by examiner, † Cited by third party
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
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
CN100550137C (en) * 2005-07-08 2009-10-14 昭和电工株式会社 The substrate of magnetic recording media, magnetic recording media and magnetic recording and transcriber
MY201736A (en) * 2007-12-28 2024-03-15 Hoya Corp Glass substrate for a magnetic disk, magnetic disk and method of manufacturing a magentic 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

Also Published As

Publication number Publication date
CN103400588B (en) 2016-09-07
CN102930874B (en) 2016-03-09
CN103400588A (en) 2013-11-20
SG188835A1 (en) 2013-04-30
SG188769A1 (en) 2013-04-30
CN102930874A (en) 2013-02-13
JP2013073658A (en) 2013-04-22
JP5126401B1 (en) 2013-01-23

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