SG153743A1 - Manufacturing method of glass substrate for magnetic disc, glass substrate for magnetic disc, and magnetic disc - Google Patents

Manufacturing method of glass substrate for magnetic disc, glass substrate for magnetic disc, and magnetic disc

Info

Publication number
SG153743A1
SG153743A1 SG200808836-1A SG2008088361A SG153743A1 SG 153743 A1 SG153743 A1 SG 153743A1 SG 2008088361 A SG2008088361 A SG 2008088361A SG 153743 A1 SG153743 A1 SG 153743A1
Authority
SG
Singapore
Prior art keywords
magnetic disc
glass substrate
manufacturing
defect
judging
Prior art date
Application number
SG200808836-1A
Inventor
Kenichi Nishimori
Tanwa Tanorthong
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 SG153743A1 publication Critical patent/SG153743A1/en

Links

Landscapes

  • Manufacturing Of Magnetic Record Carriers (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)

Abstract

A manufacturing method of a glass substrate 100 for a magnetic disc according to the present invention includes a substrate condition measuring step S200; a defect inner surface position specifying step S202; a surface defect judging step S204 for judging whether or not a defect with specified inner surface position is on the surface of the glass substrate 100 or the basis of the number of images formed at an inner surface position by an image forming means; and the non- defective judging step S206 for judging whether or not the glass substrate 100 is non-defective on the basis of a result of the surface defect judging step S204. (FIG. 2)
SG200808836-1A 2007-12-28 2008-11-28 Manufacturing method of glass substrate for magnetic disc, glass substrate for magnetic disc, and magnetic disc SG153743A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007340827A JP5084495B2 (en) 2007-12-28 2007-12-28 Manufacturing method of glass substrate for magnetic disk, glass substrate for magnetic disk and magnetic disk

Publications (1)

Publication Number Publication Date
SG153743A1 true SG153743A1 (en) 2009-07-29

Family

ID=40901942

Family Applications (1)

Application Number Title Priority Date Filing Date
SG200808836-1A SG153743A1 (en) 2007-12-28 2008-11-28 Manufacturing method of glass substrate for magnetic disc, glass substrate for magnetic disc, and magnetic disc

Country Status (2)

Country Link
JP (1) JP5084495B2 (en)
SG (1) SG153743A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6463246B2 (en) * 2015-09-30 2019-01-30 株式会社日立ハイテクファインシステムズ Optical surface inspection apparatus and optical surface inspection method
JP7390278B2 (en) 2020-12-16 2023-12-01 株式会社日立ハイテクソリューションズ Appearance inspection method, appearance inspection device, processing method and device for structures

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3108428B2 (en) * 1990-08-13 2000-11-13 株式会社東芝 Defect detection device for transparent circular work
JP2004233338A (en) * 2003-01-08 2004-08-19 Tdk Corp Defect detection method of disc substrate, apparatus for the same, and method for manufacturing substrate for optical disc

Also Published As

Publication number Publication date
JP2009162570A (en) 2009-07-23
JP5084495B2 (en) 2012-11-28

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