Method and apparatus for recording information on magnetooptical recording medium while canceling external stray magnetic field
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United States of America Patent
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Nov 11, 1997
Grant Date -
N/A
app pub date -
Oct 7, 1994
filing date -
May 15, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A magnetooptical recording apparatus effects recording of information on a recording medium using an optical head and a magnetic head while cancelling an external stray magnetic field generated from an actuator, a linear motor or the like. The external stray magnetic field is detected by a detection circuit. A magnetic field for cancelling the detected external stray magnetic field is applied to the recording medium using a magnetic member, a coil wound around the magnetic member and a power source for supplying current to the coil. The external stray magnetic field is detected on the basis of a shift amount, caused by the external stray magnetic field, of a B-H curve representing a relationship between a magnetic field H running through the magnetic member and a magnetic flux B generated in the magnetic member.
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