Is a
Patent attributes
Current Assignee
1
Patent Jurisdiction
Patent Number
Patent Inventor Names
Hideki Isono1
Date of Patent
February 22, 2011
1Patent Application Number
105942481
Date Filed
March 24, 2005
1Patent Citations Received
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Patent Primary Examiner
Patent abstract
A magnetic disk glass substrate including compressive stress layers at main surfaces and a tensile stress layer between the compressive stress layers formed by chemical strengthening. When the glass substrate has a thickness of less than 0.5 mm and the tensile stress layer has a thickness L and a tensile stress of Pt (kg/mm2), the following relation holds:0.4 (kg/mm)≦L·Pt≦2.0 (kg/mm).
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