JPS6370908A - Perpendicular magnetic recording and reproducing head - Google Patents

Abstract

PURPOSE:To prevent deterioration in the recording/reproducing characteristic due to a magnetic shortcircuiting by magnetically insulating between the part of a main magnetic pole pintching part which lies to a recording medium side rather than the part winding a coil winding of a main magnetic pole pintching part in an auxiliary magnetic pole block and a magnetic pole block. CONSTITUTION:The opening 11 in the magnetic block 10 is made large, a gap A is provided between part B of the main magnetic pole pinching part which lies to a recording medium side rather than the part winding the coil winding 5 of the main magnetic pole pinching in the auxiliary pole block 1 and the magnetic pole block 10, and the part B and the block 10 are magnetically insulated. Since such magnetically insulating means is provided, the occurrence of problems such as the increase in inductance of a magnetic head not relating to the recording/reproducing sensitivity, degrading of the sensitivity, etc., is prevented, and also the degrading of the recording/reproducing characteristic is avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a perpendicular magnetic recording/reproducing head, and in particular 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. This invention relates to improvements in magnetic recording and reproducing heads.

[Summary of the Invention - A magnetic body adjacent to at least one side of at least one support block extending in the recording trunk direction of the medium, which is made of a main magnetic pole, an auxiliary magnetic pole block sandwiching the main magnetic pole, and a non-magnetic body bonded to each other. magnetically insulating between the main magnetic pole sandwiching part and the magnetic block that are closer to the recording medium than the part around which the coil winding of the main pole sandwiching part of the auxiliary magnetic pole block is wound. ing.

[Prior Art] FIG. 9 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 coil.

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 that determines 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 above-mentioned 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
gy1h exhibits the effect of a so-called pseudo magnetic recording/reproducing gap, and it is impossible to avoid the adverse effect of causing output waveform distortion in the signal output.

Furthermore, in order to solve the 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. As shown in FIG. 10, when a magnetic block is arranged adjacent to at least one side of the support block, the coil winding of the main pole holding part in the auxiliary pole block of the support block is wound. There is a risk that the main pole sandwiching portion B, which is closer to the recording medium than the rotated portion, and the magnetic block may be magnetically short-circuited, resulting in deterioration of recording and reproducing characteristics.

In FIG. 10, the dotted line hypothetically indicates the position where the winding window of the magnetic block and the lower edge of the non-magnetic material of the support block contact each other when the magnetic block is placed adjacent to the support block.

The present invention has been made in view of the above-mentioned actual state of the prior art,
The object thereof is to provide a perpendicular magnetic recording/reproducing head which solves the above-mentioned problem that the recording/reproducing characteristics tend to deteriorate due to magnetic short circuits.

[Means for Solving the Problems] In order to achieve the above object, the magnetic head of the present invention includes a main magnetic pole and a main magnetic pole holding part that holds a part of the main magnetic pole, on the perpendicular magnetic recording medium side of an auxiliary magnetic pole block. Using at least one support block formed by bonding a non-magnetic material set to a required thickness from the opposing surface of the medium, the main magnetic pole sandwiching portion of the auxiliary magnetic pole block and the non-magnetic material The main magnetic pole of the auxiliary magnetic pole block has a support block that sandwiches the entire magnetic pole, and a magnetic block adjacent to at least one side of the support block in the track width direction perpendicular to the recording track direction of the recording medium. The magnetic material block is characterized in that a portion of the main pole sandwiching portion closer to the recording medium than a portion around which the coil winding of the sandwiching portion is wound is magnetically insulated from the magnetic block.

[Function] By forming the above-mentioned magnetic head as described above, the above-mentioned magnetic recording/reproducing circuit can be magnetically operated using the above-mentioned magnetic material block by preventing the magnetic resistance from passing through large air gaps or non-magnetic materials. By short-circuiting the structure, the magnetic resistance can be reduced, in other words, the recording/reproducing sensitivity can be increased. Moreover, by providing the above-mentioned magnetic insulation means, the inductance of the magnetic head, which does not affect the recording/reproducing sensitivity, can be increased. , problems such as a decrease in sensitivity can be prevented.

[Example] Hereinafter, the present invention will be explained based on the drawings.

1 and 2 are perspective views showing an example of the basic configuration of the present invention.

In FIG. 1, the same reference numerals are used for the same parts as in FIG. 9, so 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 material block 10→auxiliary magnetic pole blocks 1a, 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 contacts 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.

Further, as is clear from FIG. 2', the opening 11 of the magnetic block 10 is made sufficiently large, and is closer to the recording medium than the part around which the coil winding 5 of the main pole sandwiching part of the auxiliary pole block 1 is wound. Since a gap A exists between the portion B of the main pole sandwiching portion and the magnetic block, this gap is magnetically insulated. In FIG. 2, the dotted line hypothetically indicates the position where the winding window of the magnetic block and the lower edge of the non-magnetic material of the support block contact each other when the magnetic block is placed adjacent to the support block.

In addition, in the example shown in FIG.
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 this example described above can be constructed and the same effects can be obtained.

Now, when the magnetic material block 10 is placed adjacent to the support block 4, the auxiliary magnetic pole block la is placed next to the support block 4.

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 (the part B in Fig. 2).
Alternatively, if the clamping parts 1e, if come into direct contact with the magnetic block 1, for example, during signal recording, the magnetic flux generated by the coil 5 is returned via the magnetic block 10 without passing through the medium, and during signal reproduction, the magnetic flux of the medium is returned via the magnetic block 10. The signal magnetic flux will be returned without passing through the coil, and the original magnetic recording/reproducing circuit will no longer be configured.1 For example, as shown in Figure 2 above, magnetically insulate the part B and the magnetic block. An embodiment of the present invention is shown in FIGS. 3 and 4, in which a magnetic insulating means is interposed in place of the air gap shown in FIG. 2.

The insulating means is, for example, a magnetic block that faces the part B, that is, the part of the main pole sandwiching part of the auxiliary magnetic pole blocks la, lb that is closer to the recording medium than the part around which the coil winding 5 of the main pole sandwiching part is wound. Grooves 10a and 10b are formed in the portion 10, and the grooves are filled with a non-magnetic material 12 such as glass.

The non-magnetic material 12 serving as the insulating means may be provided as shown in FIGS. 5 to 7.

Or, as shown in FIG. 8(A), auxiliary magnetic poles la, l
b and the non-magnetic material 6 may be filled with a non-magnetic material 13, 14 such as glass, or a groove 10c may be provided in the magnetic material block 10 as shown in FIG. The magnetic pole blocks la and lb may be filled with a non-magnetic material 15 such as glass.

[Effects of the Invention] As explained above, according to the present invention, the part B of the main pole sandwiching part of the auxiliary pole block is located closer to the recording medium than the part where the coil winding of the main pole sandwiching part of the auxiliary pole block is wound. B so that the opposing portion of the magnetic block 10 does not form a closed magnetic path.
By magnetically insulating between the magnetic block 10 and the magnetic block 10, it is possible to provide a magnetic head that does not deteriorate the improved recording and reproducing characteristics as described above.

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.

[Brief explanation of the drawing]

1 and 2 are a perspective view and an exploded perspective view showing the basic structure of the magnetic head of the present invention, FIGS. 3 and 4 are a perspective view and an exploded perspective view showing an embodiment of the invention, and FIG. Figures to 8th
The figures are perspective views showing main parts of other embodiments of the present invention, and FIGS. 9 and 10 are perspective views showing conventional perpendicular magnetic recording and reproducing heads. 1... Auxiliary magnetic pole, 2... Coil winding window. 3... Main magnetic pole, 4... Support block, 5... Coil, 6... Non-magnetic material, 10... Magnetic material block, 11... Opening. 12.13,14...Nonmagnetic material. Δtsu''F Komori's I anti-thread pattern 2 Figure 1//1 Temporary armpit Figure 4 Figure 6 Figure 7 Figure 8 (A) 1b Ia Figure 8 (B)

Claims (1)

[Claims] A non-magnetic material set to a desired thickness is bonded to the perpendicular magnetic recording medium side of the auxiliary magnetic pole block, which is equipped with a main magnetic pole and a main magnetic pole holding part that holds a part of the main magnetic pole, from the facing surface of the medium. A support block in which the entire main magnetic pole is held between the main magnetic pole holding part of the auxiliary magnetic pole block and the non-magnetic material using at least one support block formed, and a track width thereof perpendicular to the recording track direction of the recording medium. a magnetic material block adjacent to at least one side of the support block in the direction, the main pole sandwiching part being closer to the recording medium than the part around which the coil winding of the main pole sandwiching part of the auxiliary pole block is wound; A perpendicular magnetic recording/reproducing head, characterized in that magnetic insulation is provided between the magnetic material block and the magnetic block.