Glass substrate for magnetic disk and magnetic recording medium

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United States of America Patent

PATENT NO 9082443
SERIAL NO

13644835

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Importance

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Abstract

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With regard to a glass substrate 1 according to the present invention, a value of an amendment concentricity AC that has taken into consideration Sk and/or Ku calculated from a shape profile over the whole circumference of an inside hole, or the skewness is within a predetermined range. The glass substrate for a magnetic recording medium can stably read servo information including track information stored on a magnetic disk when the glass substrate is used for an HDD.

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Patent Owner(s)

  • HOYA CORPORATION;HOYA GLASS DISK (THAILAND) LTD.

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Nishimori, Kenichi Lamphun, TH 12 51

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