×

Method and system for erase before write magneto-optic recording

  • US 4,888,750 A
  • Filed: 11/12/1987
  • Issued: 12/19/1989
  • Est. Priority Date: 03/07/1986
  • Status: Expired due to Fees
First Claim
Patent Images

1. A method for over-writing data on a magneto-optic recording medium having a compensation temperature tens of degrees C. above room temperature, comprising the steps of:

  • (a) erasing any previously recorded magnetic domain in the region on the recording medium to be recorded by temporarily heating the region being erased above the compensation temperature in the absence of any substantial externally provided magnetic bias field to thereby establish a known magnetic state in said recording medium;

    (b) receiving data bits to be recorded;

    (c) generating a write signal when a data bit and said known state are not the same; and

    (d) writing a magnetic domain in said previously erased region only in response to said write signal by temporarily heating an area above the compensation temperature in the absence of any substantial externally provided magnetic bias field.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×