Glass substrate for a magnetic disk, magnetic disk and method of manufacturing a magnetic disk
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United States of America Patent
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Aug 11, 2015
Grant Date -
Mar 27, 2014
app pub date -
Dec 3, 2013
filing date -
Dec 28, 2007
priority date (Note) -
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Abstract
A glass substrate for a magnetic disk, wherein, in regions with respect to two places arbitrarily selected on a surface of the glass substrate on its central portion side relative to its outer peripheral end, a surface shape with a shape wavelength in a band of 60 to 500 μm is extracted from surface shapes in each of the regions and, assuming that a root mean square roughness Rq of the surface shape is given as a microwaviness Rq, the difference between the microwavinesses Rq of the regions is 0.02 nm or less or the difference between standard deviations of the microwavinesses Rq of the regions is 0.04 nm or less.
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