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Method of manufacturing substrate for magnetic disk, apparatus for manufacturing substrate for magnetic disk, and method of manufacturing magnetic disk

  • US 7,175,511 B2
  • Filed: 07/09/2004
  • Issued: 02/13/2007
  • Est. Priority Date: 07/15/2003
  • Status: Expired due to Fees
First Claim
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1. A method of manufacturing a substrate for a magnetic disk, having a step of polishing at least an end face on an inner peripheral side of a circular hole of a nonmagnetic disk substrate having the circular hole at a center portion thereof, wherein:

  • the end face on the inner peripheral side of the circular hole is polished by magnetic abrasive finishing in which a magnetic field is formed at least on the inner peripheral side of the circular hole, an abrasive material containing magnetic particles and abrasive particles is held in the circular hole by the magnetic field and, by moving the magnetic field with respect to the end face on the inner peripheral side of the circular hole, the abrasive material is moved with respect to the end face on the inner peripheral side of the circular hole to thereby polish the end face on the inner peripheral side of the circular hole.

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