MY152421A - Glass substrate for magnetic recording medium and magnetic recording medium using the glass substrate for magnetic recording medium - Google Patents

Glass substrate for magnetic recording medium and magnetic recording medium using the glass substrate for magnetic recording medium

Info

Publication number
MY152421A
MY152421A MYPI2012004477A MY152421A MY 152421 A MY152421 A MY 152421A MY PI2012004477 A MYPI2012004477 A MY PI2012004477A MY 152421 A MY152421 A MY 152421A
Authority
MY
Malaysia
Prior art keywords
recording medium
magnetic recording
glass substrate
surface roughness
principal
Prior art date
Application number
Inventor
Minoru Tamada
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 MY152421A publication Critical patent/MY152421A/en

Links

Landscapes

  • Magnetic Record Carriers (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)
  • Surface Treatment Of Glass (AREA)

Abstract

PROBLEM IT IS AN OBJECT TO PROVIDE A GLASS SUBSTRATE FOR MAGNETIC RECORDING MEDIUM AND A MAGNETIC RECORDING MEDIUM USING THE GLASS SUBSTRATE FOR MAGNETIC RECORDING MEDIUM IN WHICH, WHEN SURFACE ROUGHNESS RA IS MEASURED FOR EACH OF EVALUATION AREAS IN A LATTICE FORM THAT ARE SET IN AT LEAST ONE OF ENTIRE PRINCIPAL SURFACES (RECORDABLE AND REPRODUCIBLE SURFACES) OF THE GLASS SUBSTRATE FOR MAGNETIC RECORDING MEDIUM, A MAXIMUM VALUE THEREOF FALLS WITHIN A PREDETERMINED RANGE. MEANS TO SOLVE THERE IS PROVIDED A GLASS SUBSTRATE FOR MAGNETIC RECORDING MEDIUM, COMPRISING: A PAIR OF PRINCIPAL SURFACES, WHEREIN, IN AT LEAST ONE OF THE PRINCIPAL SURFACES, A MAXIMUM VALUE OF A SURFACE ROUGHNESS RA MEASURED IN EACH OF EVALUATION AREAS IN A LATTICE FORM THAT ARE SET ON AN ENTIRE SURFACE OF THE PRINCIPAL SURFACE IS LESS THAN OR EQUAL TO 1.7 TIMES A MEAN VALUE OF THE SURFACE ROUGHNESS RA. SELECTED DRAWING (FIG. 1)
MYPI2012004477 2011-10-17 2012-10-08 Glass substrate for magnetic recording medium and magnetic recording medium using the glass substrate for magnetic recording medium MY152421A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2011228322A JP5212530B2 (en) 2011-10-17 2011-10-17 GLASS SUBSTRATE FOR MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING MEDIUM USING THE GLASS SUBSTRATE FOR MAGNETIC RECORDING MEDIUM

Publications (1)

Publication Number Publication Date
MY152421A true MY152421A (en) 2014-09-30

Family

ID=48062748

Family Applications (1)

Application Number Title Priority Date Filing Date
MYPI2012004477 MY152421A (en) 2011-10-17 2012-10-08 Glass substrate for magnetic recording medium and magnetic recording medium using the glass substrate for magnetic recording medium

Country Status (4)

Country Link
JP (1) JP5212530B2 (en)
CN (1) CN103050133B (en)
MY (1) MY152421A (en)
SG (1) SG189628A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018101451A (en) * 2015-04-23 2018-06-28 旭硝子株式会社 Substrate for magnetic recording medium, magnetic recording medium, and manufacturing method

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008293552A (en) * 2007-05-22 2008-12-04 Fujitsu Ltd Substrate, magnetic recording medium, its manufacturing method, and magnetic storage device
JP2009289370A (en) * 2008-05-30 2009-12-10 Furukawa Electric Co Ltd:The Glass substrate for magnetic disk
MY158962A (en) * 2008-09-30 2016-11-30 Hoya Corp Glass substrate for a magnetic disk and magnetic disk

Also Published As

Publication number Publication date
CN103050133B (en) 2016-08-10
CN103050133A (en) 2013-04-17
JP2013089268A (en) 2013-05-13
JP5212530B2 (en) 2013-06-19
SG189628A1 (en) 2013-05-31

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