MY199609A - Glass blank, method for producing glass blank, and method for producing glass substrate of magnetic disc - Google Patents

Glass blank, method for producing glass blank, and method for producing glass substrate of magnetic disc

Info

Publication number
MY199609A
MY199609A MYPI2018703932A MYPI2018703932A MY199609A MY 199609 A MY199609 A MY 199609A MY PI2018703932 A MYPI2018703932 A MY PI2018703932A MY PI2018703932 A MYPI2018703932 A MY PI2018703932A MY 199609 A MY199609 A MY 199609A
Authority
MY
Malaysia
Prior art keywords
glass blank
thickness
producing glass
blank
producing
Prior art date
Application number
MYPI2018703932A
Inventor
Isono Hideki
Hidekazu Tanino
Katsuhiko Hanada
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 MY199609A publication Critical patent/MY199609A/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B11/00—Pressing molten glass or performed glass reheated to equivalent low viscosity without blowing
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)
  • Magnetic Record Carriers (AREA)

Abstract

A central portion and an outer circumferential portion of a cfrcular plate� shaped glass blank (1) for manufacturing a magnetic-disk glass substrate are thicker than an intermediate portion in a radial dfrection, and when a difference between the maximum thickness and the minimum thickness between two main surfaces of the glass blank (1) is D, and a length of a line segment, on the main surface, which connects a central position of the glass blank (1) and a position at which the outer circumferential portion has the maximum thickness is R, then, a thickness difference between a thickness at a position on the line segment located a distance of 0.9R from the central position and the maximum thickness of the outer circumferential portion is greater than 0.2D.
MYPI2018703932A 2016-03-30 2017-03-28 Glass blank, method for producing glass blank, and method for producing glass substrate of magnetic disc MY199609A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2016069364 2016-03-30
PCT/JP2017/012649 WO2017170556A1 (en) 2016-03-30 2017-03-28 Glass blank, method for producing glass blank, and method for producing glass substrate of magnetic disc

Publications (1)

Publication Number Publication Date
MY199609A true MY199609A (en) 2023-11-09

Family

ID=59964615

Family Applications (1)

Application Number Title Priority Date Filing Date
MYPI2018703932A MY199609A (en) 2016-03-30 2017-03-28 Glass blank, method for producing glass blank, and method for producing glass substrate of magnetic disc

Country Status (4)

Country Link
JP (1) JP6979399B2 (en)
CN (1) CN108779013B (en)
MY (1) MY199609A (en)
WO (1) WO2017170556A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7116926B2 (en) * 2019-04-23 2022-08-12 日本電気硝子株式会社 Glass plate manufacturing method, glass plate, and glass plate assembly

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6539750B1 (en) * 1999-04-30 2003-04-01 Matsushita Electric Industrial Co., Ltd. Glass substrate forming mold and production method for glass substrate
JP2003026431A (en) * 2001-07-12 2003-01-29 Matsushita Electric Ind Co Ltd Substrate molding die and substrate manufacturing method using the same
CN101588996B (en) * 2007-01-16 2012-02-22 柯尼卡美能达精密光学株式会社 Mold for glass substrate molding, method for producing glass substrate, method for producing glass substrate for information recording medium, and method for producing information recording medium
JP2008208012A (en) * 2007-02-28 2008-09-11 Konica Minolta Opto Inc Glass molded body, method for manufacturing glass substrate, and method for manufacturing information recording medium
JP5015184B2 (en) * 2009-02-25 2012-08-29 Ｈｏｙａ株式会社 Information recording medium glass blank, information recording medium substrate manufacturing method, and information recording medium manufacturing method
JP5306855B2 (en) * 2009-02-26 2013-10-02 Ｈｏｙａ株式会社 Manufacturing method of information recording medium substrate and manufacturing method of information recording medium
JPWO2014051053A1 (en) * 2012-09-28 2016-08-22 Hoya株式会社 Method for manufacturing glass blank for magnetic disk, method for manufacturing glass substrate for magnetic disk, and glass blank for magnetic disk

Also Published As

Publication number Publication date
WO2017170556A1 (en) 2017-10-05
JP6979399B2 (en) 2021-12-15
CN108779013B (en) 2022-08-12
JPWO2017170556A1 (en) 2019-02-07
CN108779013A (en) 2018-11-09

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