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Title:
GLASS SUBSTRATE FOR MAGNETIC DISK, MAGNETIC DISK, GLASS SUBSTRATE INTERMEDIATE BODY, AND METHOD FOR MANUFACTURING GLASS SUBSTRATE FOR MAGNETIC DISK
Document Type and Number:
WIPO Patent Application WO/2017/057686
Kind Code:
A1
Abstract:
An end surface of a glass substrate for a magnetic disk comprising an alkaline earth metal component as a glass composition is specular, and in the load factor curve of the roughness cross-sectional area obtained when surface roughness of the end surface is measured after etching 2.5 µm of the end surface, the roughness percentage is 40% or more when the load factor of the roughness cross-sectional area is 50%.

Inventors:
AZUMA SHUHEI (JP)
Application Number:
PCT/JP2016/079037
Publication Date:
April 06, 2017
Filing Date:
September 30, 2016
Export Citation:
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Assignee:
HOYA CORP (JP)
International Classes:
G11B5/73; G11B5/84
Domestic Patent References:
WO2014050241A12014-04-03
WO2015152316A12015-10-08
Foreign References:
JPH07244947A1995-09-19
JP2007042263A2007-02-15
JP2007272995A2007-10-18
JP2000132829A2000-05-12
Attorney, Agent or Firm:
GLOBAL IP TOKYO (JP)
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