JPH065565B2 - Perpendicular magnetic recording / playback head - Google Patents

Description

The present invention relates to a perpendicular magnetic recording / reproducing head, and more particularly to a perpendicular magnetic recording / reproducing 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 improvement of a magnetic recording / reproducing head.

[Outline of the Invention] At least one support block extending in the recording track direction of the above-mentioned medium in which a main magnetic pole and an auxiliary magnetic pole block sandwiching the main magnetic pole are joined to a non-magnetic material, and at least one side of the support block is covered. The magnetic film is formed on the side surface of the main magnetic pole holding portion on the recording medium side of the portion of the main magnetic pole holding portion of the auxiliary magnetic pole block where the coil winding is wound. By not doing so, the main magnetic pole sandwiching portion and the magnetic film are magnetically insulated.

[Prior Art] FIG. 2 is a perspective view of a conventional perpendicular magnetic recording / reproducing head.

Auxiliary magnetic pole block 1 having an aperture-shaped coil winding window 2
A pair of support blocks 4 are formed by joining nonmagnetic materials 6 and 6 having a required thickness from the medium contact surface to the upper portions of a and 1b.
4 is formed. The main magnetic pole 3 is sandwiched between the pair of support blocks 4 and 4 to form a core chip, and the surfaces of the non-magnetic bodies 6 and 6 contacting the medium are made spherical and polished, and then the coil winding window 2 is formed. A coil is wound around to form a perpendicular magnetic recording / reproducing head.

In the magnetic head having the above structure, a magnetic recording medium such as a magnetic disk or a magnetic tape moves in a contact area A centered on the main magnetic pole 3 while keeping sliding contact or maintaining a predetermined space. When a recording signal is passed through 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 a portion facing the upper end of the main magnetic pole 3 is magnetized in the vertical direction. To do. That is, the magnetic flux generated from the main pole is the magnetic layer of the recording medium → the soft magnetic layer of the recording medium → the magnetic layer → the air gap (from the surface of the non-magnetic body 6 above the return path portions 1c and 1d to the medium). Interval) → non-magnetic material 6 →
Return path portion 1 of the auxiliary magnetic pole blocks 1a and 1b
c, 1d → main magnetic pole holding portion 1e of the auxiliary magnetic pole block,
A magnetic recording circuit is constructed so as to return to the main magnetic pole 3 via 1f. Further, when reproducing a signal, a magnetic reproducing circuit is constructed in which a signal current is output to the coil 5 by a recording signal recorded in the magnetic layer of the medium, contrary to the magnetic recording process.

In this type of head, the main factor that determines the recording / reproducing sensitivity depends on the magnetic resistance of the magnetic recording / reproducing circuit. That is, the smaller the magnetic resistance is, the higher the recording / reproducing sensitivity is.

[Problems to be Solved by the Invention] However, in the conventional perpendicular magnetic recording / reproducing head, as described above, since the air gap and the non-magnetic body 6 are present in the magnetic recording / reproducing circuit, the magnetic resistance is large. It was difficult to improve the recording / reproducing sensitivity.

Therefore, in order to reduce the magnetic resistance, magnetic heads having the configurations shown in FIGS. 3 and 4 have also been proposed.

In FIG. 3, the same reference numerals are used for the same members as in FIG. 2, and thus duplicated description is omitted, but at least one side of the support blocks 4 and 4, that is, the recording track direction of the support blocks 4 and 4. A magnetic material block 10 made of a magnetic material (for example, ferrite) is provided adjacent to at least one side in the track width direction perpendicular to the magnetic recording / reproducing circuit, whereby the magnetic recording / reproducing circuit is formed into the main pole 3 → the magnetic layer of the recording medium → the magnetic recording layer. Soft magnetic layer of recording medium → magnetic layer → magnetic block 10 → auxiliary magnetic pole blocks 1a and 1b → main magnetic pole 3
It is configured so that

By configuring the magnetic recording / reproducing circuit in this way, the magnetic resistance is greatly reduced as described above, and the recording / reproducing efficiency is improved. Moreover, since the return path is provided from the side separated from the inside of the recording track, even if the magnetic body contacts the medium as the contact area, a pseudo gap does not occur and an output waveform distortion or the like does not occur.

The magnetic block 10 is provided with an opening 11 at a position facing the coil winding window 2 of the support blocks 4 and 4.
The coil is wound and taken out through this opening 11.

Further, as is apparent from FIG. 4, the opening 11 of the magnetic block 10 is large, and the main magnetic pole holding portion of the auxiliary magnetic block 1 has a main magnetic pole portion closer to the recording medium side than a portion around which the coil winding 5 is wound. Since there is a gap A between the magnetic pole sandwiching portion B and the magnetic block, magnetic insulation is provided between them. It should be noted that in FIG. 4, the dotted line virtually shows the position where the winding window of the magnetic block and the lower edge of the non-magnetic body of the support block contact each other when the magnetic block is adjacent to the support block.

It should be noted that in the example of FIG. 3, a symmetrical 1 is used to hold the main magnetic pole 3.
Although a pair of support blocks 4 and 4 are used, one of them may be the above support block and the other may be formed of only a non-magnetic material.
Return path portion 1 of the auxiliary magnetic pole blocks 1a and 1b
c and 1d may be deleted, and in any case, a magnetic recording / reproducing circuit similar to this example described above can be configured, and similar effects can be obtained.

However, in this case, when the magnetic block 10 is adjacent to the support block 4, the auxiliary magnetic pole blocks 1a and 1b are used.
When the main magnetic pole 3 or the holding portions 1e, 1f directly contacts the magnetic block on the side closer to the medium than the winding portion of the main magnetic pole holding portions 1e, 1f (the portion B in FIG. 4). For example, when recording a signal, the magnetic flux generated from the coil 5 is returned through the magnetic block 10 without passing through the medium, and when reproducing the signal, the signal magnetic flux of the magnetic layer of the medium is returned without passing through the coil. Since the original magnetic recording / reproducing circuit is not formed, it is necessary to magnetically insulate the portion B from the magnetic block as shown in FIG. 4, for example. Instead of the gap shown in FIG. A structure having the structure shown in FIGS. 5 and 6 in which a magnetic insulating means is interposed is also proposed.

The insulating means is, for example, a magnetic body block facing the portion B, that is, the portion of the main magnetic pole holding portion on the recording medium side of the portion of the main magnetic pole holding portion of the auxiliary magnetic pole blocks 1a and 1b on which the coil winding 5 is wound. Grooves 10a and 10b are formed in the portion 10 and the groove is filled with a non-magnetic material such as glass.

Now, a problem in manufacturing the above-mentioned magnetic head is that, in order to reduce the thickness of the magnetic head, the magnetic block 10 and the support block 4 must be thin, which makes it difficult to manufacture the magnetic head and the support block 4. In addition, if the total number of the magnetic substance blocks 10 is two or one, three or two of the above-mentioned blocks are required, which means that the number of parts is relatively large.

Therefore, it is an object of the present invention to provide a perpendicular magnetic recording / reproducing head which has a return path in the track width direction and is easy to be thin and easy to manufacture.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention replaces the magnetic block in the magnetic head with a magnetic film deposited on at least one side of the support block to form an auxiliary magnetic pole block. By not depositing the magnetic film on the side surface of the main magnetic pole holding portion on the recording medium side of the portion of the main magnetic pole holding portion on which the coil winding is wound, the main magnetic pole holding portion and the magnetic film are magnetically attached. Insulation is the main point.

[Operation] By forming the magnetic head as described above, the magnetic recording / reproducing circuit described above is made magnetic by using the magnetic thin film body so as not to pass through an air gap having a large magnetic resistance or a non-magnetic body. The magnetic resistance can be reduced by constructing by short-circuiting, in other words, the recording / reproducing sensitivity can be enhanced, and since the magnetic block is not used, the magnetic head can be easily thinned and the manufacturing is also simplified. .

[Examples] The present invention will be described below with reference to the examples shown in the drawings.
In FIG. 1, the same numerals as those in FIGS. 2 and 3 indicate the same members, and the difference from those in FIGS. 2 and 3 is that instead of the magnetic block 10, the support block 4 Magnetic film 4 on both sides (or one side) by sputtering, vapor deposition, etc.
This is the point where a and 4b are deposited and used as the return path in the track width direction.

However, the magnetic thin film is not attached to the coil winding portion 5a by etching after vapor deposition or mask treatment before vapor deposition, thereby preventing the magnetic thin film from forming a closed magnetic path.

Further, when the magnetic thin film is removed as described above, a magnetic film is formed on the side surface of the main magnetic pole holding portion B on the recording medium side of the portion of the main magnetic pole holding portion of the auxiliary magnetic pole block 1 around which the coil winding 5 is wound. The main magnetic pole holding portion is magnetically insulated from the magnetic thin film body so that the magnetic pole is not surely adhered.

The return path in the track width direction may be provided only on one side of the support block 4, and in that case, the magnetic thin film body is attached only on that one side.

[Effect of the Invention] As is apparent from the above description, according to the present invention, the read / write sensitivity is improved by providing the return path in the track width direction, and the coil winding windows 5b and 5c can be made large. In the magnetic recording / reproducing head, since the magnetic film is used instead of the magnetic block for forming the pattern path, thinning of the head and simplification of manufacturing are favorable.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, and FIGS. 2 to 6 are perspective views showing a conventional perpendicular magnetic recording / reproducing head. 1 ... Auxiliary magnetic pole, 3 ... Main magnetic pole, 4 ... Support block, 4a, 4b ... Magnetic film, 5 ... Coil, 5a ... Coil winding part, B ... Main magnetic pole sandwiching part.

Claims (1)

[Claims] 1. A non-magnetic material having a required thickness from the contact surface of the main magnetic pole on the side of the perpendicular magnetic recording medium of the auxiliary magnetic pole block having the main magnetic pole sandwiching portion for sandwiching the main magnetic pole. A support block in which the main magnetic pole sandwiching portion of the auxiliary magnetic pole block and the non-magnetic material sandwich the entire main magnetic pole by using at least one support block formed by joining the bodies, and in the recording track direction of the recording medium. A magnetic film body formed into a thin film by being attached to at least one side of the support block in the track width direction which is perpendicular to it, and winding the coil winding of the main magnetic pole sandwiching portion of the auxiliary magnetic pole block. A perpendicular / perpendicular magnetic recording / reproducing head characterized in that a side surface of the main magnetic pole holding portion closer to the recording medium than the above portion is magnetically insulated from the magnetic thin film body.