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AssigneeHitachi, Ltd.
InventorsHiroshi Suzuki, Hideo Todokoro, Hisashi Takano, Hiroyuki Shinada
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A magnetic head has a peripheral magnetic field, which is weaker than the coercivity of a recording medium, that is formed beside or around magnetic poles that define a narrow track width. This reinforces a longitudinal magnetic field produced by the head which has been weakened by reducing the cross section of each of the magnetic poles in an effort to obtain the narrow track width. That is, the longitudinal magnetic field distribution formed by the magnetic head is provided by a combination of the principal region having the strongest magnetic field for defining the narrow track width, and the region having a weak magnetic field formed beside or around the principal region. In this way, the combined magnetic field is stronger that the coercivity of the recording medium, but only at the magnetic poles so a narrow track width is achieved.
A magnetic head for performing either a recording operation or a reproducing operation for a recording medium, comprising a first pair of magnetic pole portions for producing a main magnetic field distribution extending in a track width direction corresponding to the width of a recording track of the recording medium, and a second pair of magnetic pole portions for producing a peripheral magnetic field distribution extending in the track width direction spread beside or around the main magnetic field distribution, the magnetic pole portions in said first pair being formed at symmetrical points with respect to a gap between said magnetic poles.
A magnetic head for performing either a recording or reproducing operation for a recording medium, wherein a distribution of a magnetic field formed by the magnetic head is obtained by combining a distribution of a main magnetic field corresponding to the width of a recording track of the recording medium, with a distribution of a peripheral magnetic field spread beside or around the main magnetic field distribution;
A magnetic head for performing either a recording or reproducing operation for a recording medium, wherein a distribution of a magnetic field formed by the magnetic head is obtained by combining a distribution of a main magnetic field corresponding to the width of a recording track of the recording medium, with a distribution of a peripheral magnetic field spread beside or around the main magnetic field distribution;
A magnetic head for performing either a recording or reproducing operation for a recording medium, wherein a longitudinal magnetic field distribution formed by the magnetic head has at least three inflection points in at least one of a recording track width direction and a longitudinal recording direction, and a longitudinal magnetic field due to the magnetic head has at least two intensity levels of magnetic field at the same time;
A magnetic head for performing either a recording or reproducing operation for a recording medium, wherein a distribution of a magnetic field formed by the magnetic head is obtained by combining a distribution of a main magnetic field corresponding to the width of a recording track of the recording medium, with a distribution of a peripheral magnetic field spread beside or around the main magnetic field distribution;
A magnetic head for performing either a recording or reproducing operation for a recording medium, wherein a distribution of a magnetic field formed by the magnetic head is obtained by combining a distribution of a main magnetic field corresponding to the width of a recording track of the recording medium, with a distribution of a peripheral magnetic field spread beside or around the main magnetic field distribution;
A magnetic head for performing either a recording or reproducing operation for a recording medium, wherein a distribution of a magnetic field formed by the magnetic head is obtained by combining a distribution of a main magnetic field corresponding to the width of a recording track of the recording medium, with a distribution of a peripheral magnetic field spread beside or around the main magnetic field distribution;
A magnetic head for performing either a recording or reproducing operation for a recording medium, wherein a distribution of a magnetic field formed by the magnetic head is obtained by combining a distribution of a main magnetic field corresponding to the width of a recording track of the recording medium, with a distribution of a peripheral magnetic field spread beside or around the main magnetic field distribution;
Dependencies are inferred from the claim text.