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US 6,212,136 B1Granted
Magneto-optical disc apparatus with means to change the angle and distance between a magnetic field generating source and a magneto-optical disc
AssigneeSony Corporation
InventorsFumisada Maeda, Yoshinori Matsumoto
Life of this patent
Estimating the term…
Abstract
The present invention is directed to a magneto-optical disc apparatus which includes a magnetic field generating source (12). The magnetic field generating source (12) is disposed so as to become freely rotatable with respect to a magneto-optical disc (1) and a spacing between it and the magneto-optical disc (1) can be changed. Plural kinds of magneto-optical discs can be recorded and reproduced with a compatibility by the common magnetic field generating source (12).
Claims3
A magneto-optical disc apparatus for use with plural discs requiring different magnetic field intensities, comprising:
- a magnetic field generating source for applying a plurality of discrete magnetic field intensities individual to one of said discs to a magneto-optical disc during reading or writing, said magnetic field generating source being made freely rotatable about an axis substantially parallel to and overlying a surface of said magneto-optical disc to allow rotating said source to change the direction of the field generated by said source relative to said disc;
- and
- means for changing a distance of said rotation central axis of said magnetic field generating source relative to said magneto-optical disc, to provide said plurality of magnetic field intensities at said disc.
Dependencies are inferred from the claim text.