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MY168982A - Glass substrate for information recording medium and magnetic disk device - Google Patents

Glass substrate for information recording medium and magnetic disk device

Info

Publication number
MY168982A
MY168982A MYPI2015704691A MYPI2015704691A MY168982A MY 168982 A MY168982 A MY 168982A MY PI2015704691 A MYPI2015704691 A MY PI2015704691A MY PI2015704691 A MYPI2015704691 A MY PI2015704691A MY 168982 A MY168982 A MY 168982A
Authority
MY
Malaysia
Prior art keywords
glass substrate
deviation amounts
recording medium
information recording
rotation center
Prior art date
Application number
MYPI2015704691A
Inventor
Naoyuki Fukumoto
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 MY168982A publication Critical patent/MY168982A/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
    • G11B5/62—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
    • 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

Landscapes

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

Abstract

A glass substrate for an information recording medium has a rotation center (CP), and includes main surfaces and an outer circumferential edge surface. In the case where a radius of a glass substrate (lG) is R, points R3 on reference lines (BL) that are located0.99R apart from the rotation center (CP) are reference positions, and distances from points located on the main surfaces that coincide with the reference positions when viewed in an extending direction of a rotation axis (Ll) passing through the rotation center (CP), to the reference positions are deviation amounts, on both the front side and the back side, differences between the maximum values and the minimum values of distributions of the deviation amounts in the circumferential direction where the reference positionsare radius positionsare 40 nm or less, and a difference between the average value of the distribution of the deviation amounts in the circumferential direction on the front side and the average value of the distribution of the deviation amounts in the circumferential direction on the back side is 10 nm or less.
MYPI2015704691A 2013-06-27 2014-05-29 Glass substrate for information recording medium and magnetic disk device MY168982A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2013134918 2013-06-27

Publications (1)

Publication Number Publication Date
MY168982A true MY168982A (en) 2019-01-29

Family

ID=52141611

Family Applications (1)

Application Number Title Priority Date Filing Date
MYPI2015704691A MY168982A (en) 2013-06-27 2014-05-29 Glass substrate for information recording medium and magnetic disk device

Country Status (5)

Country Link
JP (1) JP5898381B2 (en)
CN (1) CN105247615B (en)
MY (1) MY168982A (en)
SG (1) SG11201510551VA (en)
WO (1) WO2014208259A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6481509B2 (en) * 2015-05-25 2019-03-13 Ａｇｃ株式会社 Glass for magnetic recording medium substrate, magnetic recording medium substrate, and magnetic recording medium
JP6786307B2 (en) * 2016-08-29 2020-11-18 株式会社ニューフレアテクノロジー Vapor deposition method
JP7395534B2 (en) * 2021-03-24 2023-12-11 株式会社東芝 disk device

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5518166B2 (en) * 2006-09-19 2014-06-11 Ｈｏｙａ株式会社 Method for manufacturing glass substrate for magnetic disk and method for manufacturing magnetic disk
WO2008035586A1 (en) * 2006-09-19 2008-03-27 Hoya Corporation Process for producing glass substrate for magnetic disk and process for manufacturing magnetic disk
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
WO2009084534A1 (en) * 2007-12-28 2009-07-09 Hoya Corporation Magnetic disk glass substrate, magnetic disk, and magnetic disk manufacturing method
JP2010073289A (en) * 2008-09-22 2010-04-02 Hoya Corp Substrate for magnetic disk and magnetic disk
CN103930947B (en) * 2011-09-30 2016-12-21 Hoya株式会社 Glass substrate for information recording medium and information recording carrier
JP5991728B2 (en) * 2011-09-30 2016-09-14 Hoya株式会社 Manufacturing method of glass substrate for magnetic disk and manufacturing method of magnetic disk

Also Published As

Publication number Publication date
CN105247615B (en) 2018-06-22
JPWO2014208259A1 (en) 2017-02-23
SG11201510551VA (en) 2016-01-28
CN105247615A (en) 2016-01-13
JP5898381B2 (en) 2016-04-06
WO2014208259A1 (en) 2014-12-31

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