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Method of and device for demagnetizing magnetic recording medium

  • US 5,053,893 A
  • Filed: 07/06/1990
  • Issued: 10/01/1991
  • Est. Priority Date: 07/16/1984
  • Status: Expired due to Term
First Claim
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1. A method of demagnetizing a magnetic recording medium, comprising the steps of:

  • i) applying a saturating magnetic field to said magnetic recording medium;

    ii) applying an unsaturating magnetic field to said magnetic recording medium in a direction opposite to the direction of said saturating magnetic field; and

    iii) applying an alternating magnetic field to said magnetic recording medium to remove residual magnetism which has been left on the magnetic recording medium by said unsaturating magnetic field.

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