JPS6370907A - Perpendicular magnetic recording and reproducing head - Google Patents

Abstract

PURPOSE:To improve the sensitivity of recording and reproducing by forming the contacting area to medium of a magnetic head with the non-magnetic body of a supporting block and a magnetic block neighboring one side of the said block so that no magnetic material except the main magnetic pole and the magnetic block is contained in the titled head. CONSTITUTION:The magnetic block 10 made of magnetic material is provided neighboring at least one side of the track width of the supporting block vertical to the direction of recording track. And a magnetic recording and reproducing circuit is constituted of the main magnetic pole 3, the magnetic layer of recording medium, soft magnetic layer of the said medium, the said former magnetic layer, the magnetic block 10, auxiliary magnetic pole block 1, and the main magnetic pole 3, in this order in manufacturing. In such a way, by not letting the magnetic resistance of the said circuit pass an air gap or a non-magnetic material whose magnetic resistances are large and shortcircuiting the magnetic block magnetically, the magnetic resistance can be made smaller, hence the sensitivity of recording and reproducing can be improved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a perpendicular magnetic recording/reproducing head, and particularly to a perpendicular magnetic recording head suitable for a type in which a main magnetic pole and an auxiliary magnetic pole are integrally arranged on one side of a magnetic recording medium. The present invention relates to a magnetic recording/reproducing head.

[Summary of the Invention] A perpendicular magnetic recording/reproducing head having a contact area with a medium extending in the recording track direction of the medium in which a main magnetic pole, an auxiliary magnetic pole block sandwiching the main magnetic pole, and a non-magnetic material are bonded to each other. The support block is formed to include the non-magnetic material of one support block and a magnetic material block adjacent to at least one side of the support block, and a region in contact with the medium is defined by the main magnetic pole and the magnetic material. It is formed so that it does not contain any magnetic material other than the body block.

[Prior Art] FIG. 5 is a perspective view of a conventional perpendicular magnetic recording/reproducing head.

Auxiliary magnetic pole block la having an open coil winding window 2
, lb, a pair of port blocks 4, 4 is formed by bonding non-magnetic materials 6, 6 set to a required thickness from the medium contacting surface to the upper part of the port blocks 4, 4.
form. The main magnetic pole 3 is sandwiched between the pair of support blocks 4, 4 to form a core chip, and the surface of the non-magnetic material 6.6 that contacts the medium is made into a spherical shape or the like and polished, and then the coil winding window 2 A perpendicular magnetic recording/reproducing head is constructed by winding a coil around the core.

In the magnetic head configured as described above, a magnetic recording medium such as a magnetic disk or a magnetic tape moves in sliding contact or while maintaining a predetermined space in a contact area A centered on the main magnetic pole 3. When a recording signal is sent to the coil 5 and the main magnetic pole 3 is excited, a magnetic flux is generated in the main magnetic pole 3, and the magnetic layer of the perpendicular magnetic recording medium in the portion facing the upper end of the main magnetic pole 3 is magnetized in the perpendicular direction. do. That is, the magnetic flux generated from the main pole is transmitted from the magnetic layer of the recording medium to the soft magnetic layer of the recording medium to the magnetic layer to the air gap (return path section 1c below).

1d (distance from the surface of the upper non-magnetic material 6 to the medium) →
Non-magnetic material 6→the above-mentioned auxiliary magnetic pole block la.

A magnetic recording circuit is constructed in which the magnetic recording circuit returns to the main magnetic pole 3 via the return path portions 1c and ld of the magnetic pole block 1b and the main magnetic pole holding portions 1e and if of the auxiliary magnetic pole block. Further, during signal reproduction, a magnetic reproducing circuit is configured in which a signal current is output to the coil 5 in accordance with a recording signal recorded on the magnetic layer of the medium, contrary to the magnetic recording process.

In this type of head, the main factor determining the recording/reproducing sensitivity depends on the magnetic resistance of the magnetic recording/reproducing circuit. That is, the smaller the magnetic resistance, the better the recording and reproducing sensitivity.

[Problems to be Solved by the Invention] However, in the conventional perpendicular magnetic recording/reproducing head, as mentioned above, the magnetic recording/reproducing circuit includes an air gap and a non-magnetic material 6, and the magnetic resistance is large. It has been difficult to improve recording and reproducing sensitivity.

In addition, in order to reduce the magnetic resistance, for example, in the conventional example shown in FIG. It is also possible to move the medium in sliding contact with the medium or while maintaining a predetermined space, but in this case, the edge portions 1 of the return path portions 1c and ld
g.

1h exhibits the effect of a so-called pseudo magnetic recording/reproducing gap, and cannot avoid the negative effect of causing output waveform distortion in the signal output.

Furthermore, there is a drawback that the output signal level fluctuates when the contact conditions between the recording medium and the magnetic head (contact pressure, amount of pushing of the magnetic head into the medium, etc.) change.

The present invention has been made in view of the above-mentioned state of the prior art, and its object is to provide a perpendicular magnetic recording/reproducing head that solves the above-mentioned problems.

[Means for Solving the Problems] The above objective is to provide a contact area of the magnetic head with the medium with the main magnetic pole, the non-magnetic material of at least one support block sandwiching the main magnetic pole, and the support. This is achieved by forming the magnetic material block adjacent to at least one side of the block, and forming the area in contact with the medium so that it does not contain any magnetic material other than the main magnetic pole and the magnetic material block. Ru.

[Operation] By forming the contact area of the magnetic head with the medium as described above, the magnetic recording/reproducing circuit described above is prevented from passing through large air gaps or non-magnetic materials, and the magnetic By using body blocks and magnetically short-circuiting the structure, magnetic resistance can be reduced, and in other words, recording/reproducing sensitivity can be increased.

[Example] An embodiment of the present invention will be described below based on the drawings.

FIG. 1 is a perspective view showing an embodiment of the present invention.

In FIG. 1, the same reference numerals are used for the same parts as in FIG. 5, so a redundant explanation will be omitted. A magnetic block 10 made of a magnetic material (for example, ferrite) is provided adjacently on at least one side in the track width direction perpendicular to the recording track direction, thereby connecting the magnetic recording and reproducing circuit from the main magnetic pole 3 to the magnetic field of the recording medium. layer→soft magnetic layer of the recording medium→the above magnetic layer→
The structure is such that the magnetic block 10→auxiliary magnetic pole blocks la, lb→main magnetic pole 3.

By configuring the magnetic recording/reproducing circuit in this manner, the magnetic resistance is significantly reduced as described above, and the recording/reproducing efficiency is improved. Moreover, since the return path is made from the side separated from the inside of the recording track, even if the magnetic material comes into contact with the medium as a contact area, there is no possibility that a pseudo gap will be created and output waveform distortion will occur.

The magnetic block 10 is provided with an opening 11 at a portion facing the coil winding window 2 of the support block 4.4,
The coil is wound and taken out through this opening 11.

Note that when the magnetic block 10 is placed adjacent to the support block, the auxiliary magnetic pole block la is placed adjacent to the support block.

The main magnetic pole 3 is located closer to the medium than the main magnetic pole holding portion 1e of 1b, the part where the coil of if is wound (part B in Fig. 2).
Alternatively, if the holding portions 1e, if come into direct contact with the magnetic block, the magnetic flux generated from the main magnetic pole 3 during signal recording, for example, is returned to the magnetic block 10 without passing through the medium.
Also, during signal reproduction, the signal magnetic flux in the magnetic layer of the medium is returned without passing through the coil, and the original magnetic recording/reproducing circuit is no longer configured. It is desirable to insulate the

In this embodiment, a symmetrical magnetic pole 3 is used to sandwich the main magnetic pole 3.
Although a pair of support blocks 4, 4 are used, instead of this, one may be made of the above-mentioned support block and the other may be made of only non-magnetic material.
Return path portion 1c of the auxiliary magnetic pole blocks la and lb
, ld may be deleted, and in either case, a magnetic recording/reproducing circuit similar to that of this embodiment described above can be constructed and the same effects can be obtained.

FIG. 3 is a comparison diagram of electromagnetic conversion characteristics (input/output characteristics and recording density characteristics) of the present invention and the conventional technology. As is clear from FIG. 3, according to the present invention, both recording sensitivity and normalized output are improved.

The standardized output is the number of windings x media speed x recording track width T-m/s・μm
It is expressed as

FIG. 4 is a comparison diagram of override (referring to how much of the original signal remains when a different signal is recorded on a previously recorded signal) characteristics of the present invention and the conventional method. As is clear from FIG. 4, it was confirmed that according to the present invention, the recording sensitivity of the head was improved, so that the override characteristics were significantly improved.

Furthermore, as is clear from FIGS. 1 and 2, since the coil portion of the head is shielded by the magnetic block 10, the influence of external noise can be reduced.

Furthermore, since the magnetic block 10 in the track width direction is in contact with the recording medium, fluctuations in output due to the amount of pushing into the medium, etc. are improved.

The magnetic recording/reproducing head according to the present invention can be widely used in a perpendicular VTR magnetic head, a perpendicular floppy disk magnetic head, a perpendicular hard disk magnetic head, and other perpendicular recording magnetic heads.

[Effects of the Invention] As explained above, according to the present invention, it is possible to increase the recording/reproducing sensitivity and to improve the effects of changes in the relative positional relationship between the head and the recording medium.

[Brief explanation of the drawing]

1 and 2 are a perspective view and an exploded perspective view showing an embodiment of the present invention, FIG. 3 is a comparison diagram of electromagnetic conversion characteristics of the present invention and the conventional method, and FIG. 4 is a comparison diagram of the override characteristics of the present invention and the conventional method. FIG. 5 is a perspective view showing a conventional perpendicular magnetic recording/reproducing head. la, lb...auxiliary magnetic pole block, 2...coil winding window. 3...Main magnetic pole, 4...Support block, 5...Coil. 6... Non-magnetic material, 10... Magnetic material block, 11... Opening. Patent applicant: Japan Broadcasting Association Sankyo Seiki Seisakusho Co., Ltd. Figure 2

Claims (1)

[Claims] By bringing the main pole into contact with the recording track of the recording medium, the contact area with the medium of a magnetic head for perpendicular magnetic recording/reproduction is formed by the main pole, an auxiliary pole block that sandwiches a part of the main pole, and the medium. at least one support having a width equal to or greater than the recording width of the main magnetic pole, extending in the recording track direction and sandwiching the entire main magnetic pole, which is bonded to a non-magnetic material having a predetermined thickness from the contact area; Perpendicular magnetic recording characterized in that the block is formed to include the non-magnetic material and a magnetic material block adjacent to at least one side of the support block in the track width direction perpendicular to the recording track direction. Playback head.