MY181624A - Colloidal silica polishing composition and method for manufacturing synthetic quartz glass substrates using the same - Google Patents

Colloidal silica polishing composition and method for manufacturing synthetic quartz glass substrates using the same

Info

Publication number
MY181624A
MY181624A MYPI2014703887A MYPI2014703887A MY181624A MY 181624 A MY181624 A MY 181624A MY PI2014703887 A MYPI2014703887 A MY PI2014703887A MY PI2014703887 A MYPI2014703887 A MY PI2014703887A MY 181624 A MY181624 A MY 181624A
Authority
MY
Malaysia
Prior art keywords
glass substrate
recording medium
information recording
same
quartz glass
Prior art date
Application number
MYPI2014703887A
Inventor
Shimazu Noriko
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 MY181624A publication Critical patent/MY181624A/en

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/84—Processes or apparatus specially adapted for manufacturing record carriers
    • G11B5/8404—Processes or apparatus specially adapted for manufacturing record carriers manufacturing base layers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/73—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer
    • G11B5/739—Magnetic recording media substrates
    • G11B5/73911—Inorganic substrates
    • G11B5/73921—Glass or ceramic substrates

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)
  • Magnetic Record Carriers (AREA)
  • Surface Treatment Of Glass (AREA)

Abstract

The glass substrate (1G) for an information recording medium is a glass substrate for an information recording medium to be used in an information recording medium which has a magnetic recording layer formed on a main surface of the glass substrate (I G) and in which a recording density of a magnetic recording surface is equal to or greater than 600 bit per 6.45 square centimetre. An average value of change values of Ra of a surface of the glass substrate (1G) for an information recording medium before and after being subjected to a first alkali treatment in which the glass substrate for an information recording medium is immersed in a sodium hydroxide solution at pH 11 at 40?C for 30 minutes is 0.05 nm or less, and an average value of change values of Ra of a surface of the glass substrate for an information recording medium before and after being subjected to a second alkali treatment in which the glass substrate (1G) for an information recording medium is immersed in a sodium hydroxide solution at pH I 2 at 25?C for 2.5 hours is 0.2 nm or less. (FIG. 4)
MYPI2014703887A 2012-06-29 2013-06-18 Colloidal silica polishing composition and method for manufacturing synthetic quartz glass substrates using the same MY181624A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012147260 2012-06-29
PCT/JP2013/066706 WO2014002825A1 (en) 2012-06-29 2013-06-18 Information recording medium glass substrate, and information recording medium glass substrate manufacturing method

Publications (1)

Publication Number Publication Date
MY181624A true MY181624A (en) 2020-12-29

Family

ID=49782984

Family Applications (1)

Application Number Title Priority Date Filing Date
MYPI2014703887A MY181624A (en) 2012-06-29 2013-06-18 Colloidal silica polishing composition and method for manufacturing synthetic quartz glass substrates using the same

Country Status (5)

Country Link
JP (1) JP6267115B2 (en)
CN (1) CN104395959B (en)
MY (1) MY181624A (en)
SG (1) SG11201408464WA (en)
WO (1) WO2014002825A1 (en)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3310563B2 (en) * 1996-12-09 2002-08-05 株式会社日立製作所 Magnetic recording medium and method of manufacturing the same
JP2000117208A (en) * 1998-10-13 2000-04-25 Kurita Water Ind Ltd Electronic material washing method
US7010939B2 (en) * 2002-06-05 2006-03-14 Hoya Corporation Glass substrate for data recording medium and manufacturing method thereof
KR20050065312A (en) * 2003-12-25 2005-06-29 마츠시타 덴끼 산교 가부시키가이샤 Cleansing method of semiconductor wafer
JP4041110B2 (en) * 2004-09-29 2008-01-30 Ｈｏｙａ株式会社 Manufacturing method of glass substrate for magnetic disk and manufacturing method of magnetic disk
JP4560789B2 (en) * 2005-06-14 2010-10-13 富士電機デバイステクノロジー株式会社 Polishing method of magnetic disk substrate
JP5177087B2 (en) * 2009-07-09 2013-04-03 旭硝子株式会社 Glass substrate for information recording medium, manufacturing method thereof, and magnetic recording medium
US8969277B2 (en) * 2010-03-31 2015-03-03 Hoya Corporation Manufacturing method of a glass substrate for a magnetic disk

Also Published As

Publication number Publication date
CN104395959A (en) 2015-03-04
WO2014002825A1 (en) 2014-01-03
JP6267115B2 (en) 2018-01-24
CN104395959B (en) 2017-12-01
JPWO2014002825A1 (en) 2016-05-30
SG11201408464WA (en) 2015-04-29

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