Dynamic magnetic information storage or retrieval – Head – Core
Patent
1989-03-08
1991-05-07
Severin, David J.
Dynamic magnetic information storage or retrieval
Head
Core
360122, G11B 5127
Patent
active
050141481
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a perpendicular magnetic recording and reproducing head. More particularly, the invention pertains to improvement in or relating to a perpendicular magnetic recording and reproducing head which is of the type in which a main magnetic pole and an auxiliary magnetic pole are arranged as a unitary structure in opposed relation to one side of a magnetic recording medium.
TECHNICAL TERMS
In this specification, a term "opposed area" is intended to mean a surface area of the magnetic recording and reproducing head which makes contact with the magnetic recording medium when the magnetic head is of the type that makes contact therewith for recording and reproducing, and a surface area of the magnetic head which is adjacent but spaced a short distance from the magnetic recording medium sufficient for recording and reproducing when the magnetic head is of the type that performs recording and reproducing without making contact with the magnetic recording medium.
A term "opposed surface" is intended to mean the surface of the magnetic head which is opposed to the perpendicular magnetic recording medium.
BACKGROUND ART
A conventional perpendicular magnetic recording and reproducing head of this kind has, as shown in FIG. 12, a structure in which non-magnetic blocks 6 and 6 having a suitable thickness and for providing the opposed surface are joined to the tops of auxiliary magnetic pole blocks 1a and 1b, each of the blocks 1a and 1b having a window 2 for coil winding use, to form a pair of support blocks 4 and 4, a main magnetic pole 3 is held between the pair of support blocks 4 and 4 to form a core chip 1, and the coil is wound through the coil winding windows 2 after the surfaces of the non-magnetic blocks 6 and 6 are polished into a spherical or similar form to be contacted with or opposed to a magnetic recording medium (Patent unexamined publication No. 40314/84 (TOKKAI Sho 59-40314)).
With the magnetic head of the above structure, a magnetic tape, magnetic disk or like magnetic recording medium is driven in sliding contact with or at a predetermined distance from the opposed area A centering about the main magnetic pole 3. Consequently, when a recording signal is applied to the coil and the main magnetic pole 3 is excited accordingly, a magnetic flux is induced from the main magnetic pole 3, by which a magnetic layer of that portion of the perpendicular magnetic recording medium which is being opposed to the upper end face of the main magnetic pole 3 is magnetized in a perpendicular direction. That is, magnetic flux flow circuit is established in which the magnetic flux emanating from the main magnetic pole 3 returns thereto via a route [the magnetic layer of the magnetic recording medium.fwdarw.a soft magnetic layer of the magnetic recording medium.fwdarw.the magnetic layer.fwdarw.an air gap (between the surfaces of the non-magnetic blocks 6, 6 and the magnetic recording medium).fwdarw.the non-magnetic blocks 6, 6.fwdarw.return path portions 1c and 1d of the auxiliary magnetic pole blocks 1a and 1b.fwdarw.main magnetic pole holding portions 1e and 1f]. During reproducing a magnetic flux flow circuit is provided in which a signal current is applied to the coil 5 by a signal recorded in the magnetic layer of the magnetic recording medium via a route reverse from the above-mentioned one for magnetic recording.
In this kind of head, the primary factor that determines its recording and reproducing sensitivity depends on the reluctance of the magnetic flux flow circuit. In other words, the smaller the reluctance is, the more the recording and reproducing sensitivity increases.
In the conventional perpendicular magnetic recording and reproducing head, however, it is difficult to increase the recording and reproducing sensitivity, because the magnetic flux flow circuit includes the air gap and the non-magnetic blocks 6 and therefore has a large reluctance.
To decrease the reluctance, it is also possible, for instance, in the prior art example of FIG. 12, to adopt an
REFERENCES:
patent: 4639810 (1987-01-01), Sakai
Aruga Fusayoshi
Numazawa Junji
Yoneda Yoshiro
Kabushiki Kaisha Sankyo Seiki Seisakusho
Nippon Hoso Kyokai
Severin David J.
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