MY149665A - Magnetic disk substrate and magnetic disk - Google Patents

Magnetic disk substrate and magnetic disk

Info

Publication number
MY149665A
MY149665A MYPI20095502A MYPI20095502A MY149665A MY 149665 A MY149665 A MY 149665A MY PI20095502 A MYPI20095502 A MY PI20095502A MY PI20095502 A MYPI20095502 A MY PI20095502A MY 149665 A MY149665 A MY 149665A
Authority
MY
Malaysia
Prior art keywords
magnetic disk
substrate
main surface
directions along
disk substrate
Prior art date
Application number
MYPI20095502A
Inventor
Nishimori Kenichi
Phandon Kraisorn
Original Assignee
Hoya Corp
Hoya Glass Disk Thailand 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 Hoya Corp, Hoya Glass Disk Thailand Ltd filed Critical Hoya Corp
Publication of MY149665A publication Critical patent/MY149665A/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
    • G11B5/74—Record carriers characterised by the form, e.g. sheet shaped to wrap around a drum
    • G11B5/82—Disk carriers
    • 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

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Magnetic Record Carriers (AREA)

Abstract

A MAGNETIC DISK SUBSTRATE (1) INCLUDES A SUBSTANTIALLY FLAT MAIN SURFACE (12), AN END SURFACE (13), AND A CHAMFERED SURFACE (14) BETWEEN THE MAIN SURFACE (12) AND THE END SURFACE (13). CROSSING POINTS (CP) AT WHICH DIRECTIONS ALONG THE MAIN SURFACE (12) AND DIRECTIONS ALONG THE CHAMFERED SURFACE (14) INTERSECT ARE LOCATED AT SUBSTANTIALLY THE SAME DISTANCE FROM THE CENTER (C) OF THE SUBSTRATE IN A PLANAR VIEW OF THE MAIN SURFACE (12) OVER THE WHOLE CIRCUMFERENCE OF THE SUBSTRATE (1).
MYPI20095502A 2007-09-07 2008-09-01 Magnetic disk substrate and magnetic disk MY149665A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007232583A JP4860580B2 (en) 2007-09-07 2007-09-07 Magnetic disk substrate and magnetic disk

Publications (1)

Publication Number Publication Date
MY149665A true MY149665A (en) 2013-09-30

Family

ID=40428814

Family Applications (1)

Application Number Title Priority Date Filing Date
MYPI20095502A MY149665A (en) 2007-09-07 2008-09-01 Magnetic disk substrate and magnetic disk

Country Status (3)

Country Link
JP (1) JP4860580B2 (en)
MY (1) MY149665A (en)
WO (1) WO2009031497A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4748115B2 (en) * 2007-06-12 2011-08-17 コニカミノルタオプト株式会社 Glass substrate for magnetic recording medium and magnetic recording medium
WO2014051152A1 (en) 2012-09-28 2014-04-03 Hoya株式会社 Glass substrate for magnetic disk, and magnetic disk
JP6008060B1 (en) * 2015-12-22 2016-10-19 旭硝子株式会社 Glass substrate for magnetic recording medium, magnetic recording medium, method for manufacturing glass substrate for magnetic recording medium, and glass substrate manufacturing apparatus for magnetic recording medium

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11349354A (en) * 1998-06-08 1999-12-21 Nikon Corp Substrate for information recording medium and its production
JP2006294099A (en) * 2005-04-07 2006-10-26 Asahi Glass Co Ltd Peripheral surface polishing apparatus and manufacturing method for glass substrate for magnetic recording medium
JP2008080482A (en) * 2006-09-01 2008-04-10 Hoya Corp Manufacturing method and manufacturing device for magnetic disk glass substrate, magnetic disk glass substrate, magnetic disk manufacturing method, and magnetic disk

Also Published As

Publication number Publication date
JP2009064524A (en) 2009-03-26
WO2009031497A1 (en) 2009-03-12
JP4860580B2 (en) 2012-01-25

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