Title:
GLASS SUBSTRATE FOR MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING MEDIUM
Document Type and Number:
WIPO Patent Application WO/2017/110109
Kind Code:
A1
Abstract:
The present invention relates to a glass substrate for a magnetic recording medium having a pair of main surfaces, an outer peripheral end surface, and an inner peripheral end surface and formed in a donut shape, wherein in a cross-section orthogonal to the pair of main surfaces and passing through the center axis of the glass substrate for the magnetic recording medium, a n angle between the X axis and a straight line connecting a point on the outer peripheral end surface where the X-coordinate is 5 ìm and a point on the outer peripheral end surface where the X-coordinate is 10 ìm is between 81° and 85° inclusive , an angl e between the X axis and a straight line connecting a point where the X-coordinate is 10 ìm and a point where the X-coordinate is 20 ìm is between 69° and 83° inclusive , and an angle between the X axis and a straight line connecting a point where the X-c oordinate is 20 ìm and a point where the X-coordinate is 30 ìm is between 52° and 72° inclusive, where the axis parallel to the main surface represents the X-axis , the X-coordinate at the outermost peripheral position on the outer peripheral end surface represents 0 , and the X-coordinates from the outermost peripheral position on the outer peripheral end surface toward the central axis of the glass substrate for the magnetic recording medium are positive.
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Inventors:
OTSUKA HARUHIKO (JP)
YAMAGUCHI RYU (JP)
YAMAGUCHI RYU (JP)
Application Number:
PCT/JP2016/063215
Publication Date:
June 29, 2017
Filing Date:
April 27, 2016
Export Citation:
Assignee:
ASAHI GLASS CO LTD (JP)
International Classes:
G11B5/73; C03C3/085; C03C3/087; C03C3/091; G11B5/82
Foreign References:
| JP2001291229A | 2001-10-19 | |||
| JP2015028827A | 2015-02-12 | |||
| JP2014160539A | 2014-09-04 | |||
| JPH11265506A | 1999-09-28 | |||
| JP2002342915A | 2002-11-29 | |||
| JP2011253575A | 2011-12-15 | |||
| JP2015024954A | 2015-02-05 | |||
| JP2015027932A | 2015-02-12 |
Attorney, Agent or Firm:
EIKOH PATENT FIRM, P.C. (JP)
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