Device for compensating unequal write fields in magnetic data-storage devices, especially in disc memories
AssigneeBASF SE
InventorJoachim Hack
Life of this patent
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Abstract
A device for compensating for an inequality between the d.c. magnetic fields set up by the two oppositely acting windings, respectively, of the magnetic heads of a data storage device, particularly a disc memory, and a data storage apparatus including such a device, the device comprising means for generating a compensating direct current and feeding this current at the appropriate time to a predetermined one of the two windings of the magnetic heads. The magnitude of the compensating direct current is advantageously adjusted in dependence on the instantaneous magnitude of the write current.
Claims7
In a magnetic data storage apparatus, including a magnetic write head having two oppositely acting windings, a magnetic erase head and connections for receiving a plurality of electric command signals selectively rendering said heads effective,
- an arrangement for compensating for an inequality between the magnetic fields set up by said two windings, respectively, said arrangement comprising:
- switching means for preselecting one of said windings in accordance with the sense of said imbalance, and
- circuit means controlled by said command signals for supplying a compensating direct current to the winding preselected by said switching means while said write head is rendered effective.
A disc memory type magnetic data storage apparatus, including a magnetic write head having two oppositely acting windings, a magnetic erase head in the vicinity of said write head, connections for receiving a plurality of command signals selectively rendering said heads effective, and
- an arrangement for compensating for an inequality between the magnetic fields set up by said two windings, respectively, said arrangement comprising:
- switching means for preselecting one of said windings in accordance with the sense of said imbalance, and
- circuit means controlled by said command signals for supplying a compensating direct current to the winding preselected by said switching means while said write head is rendered effective.
Dependencies are inferred from the claim text.