JPH01158605A - Magnetic head assembling body - Google Patents

Abstract

PURPOSE:To obstruct the convergence of leakage flux from the outside on a magnetic pole by covering a magnetic head with a soft magnetic material for external magnetic field shielding over outer surface except the medium facing surface of a provided floating slider. CONSTITUTION:Two floating rails 12a and 12b are provided on the medium facing surface side of a floating slider 11 and a magnetic head for recording and reproducing whose surface is covered with a thick insulating protecting film is provided on the air efflux end face of the rail 12a. The outer surfaces except the medium facing surface of the slider 11 are covered with a soft magnetic cover 31 for the external magnetic field shielding. The cover 31 is fixed on the slider 11, after that, a lead wire 15 is connected to a connecting terminal 14 of the head 13 and the slider 11 is fitted to a supporting spring 16. Thus, the leakage flux from the outside is absorbed by the cover 31 and the convergence of the leakage flux from the outside on the magnetic pole of the head 13 is obstructed. Consequently, the demagnetization and the disappearance of magnetization information can be prevented.

Description

[Detailed Description of the Invention] [Summary] Regarding the improvement of magnetic head assemblies for recording and reproducing used in magnetic disk drives, etc., the concentration of leakage magnetic flux from the outside on the magnetic poles of the magnetic head is prevented by a simple shielding structure. In order to prevent adverse effects on recording and reproduction, a floating slider is provided with a plurality of floating rails on the surface facing the recording medium, and an insulating protective film is provided on the air outflow end surface of at least one floating rail of the floating slider. In a head assembly comprising a magnetic head coated with a magnetic head, the outer circumferential surface of the floating slider except for the recording medium side surface is covered with a soft magnetic material for shielding an external magnetic field.

[Industrial application field]

The present invention relates to improvements in magnetic head assemblies used in magnetic disk drives and the like, and particularly to a structure that eliminates the influence of leakage magnetic flux from the outside on magnetic poles.

In a magnetic head assembly with a structure in which a levitating slider and a magnetic head are attached to a predetermined area, leakage magnetic flux from outside other than the magnetic recording medium inadvertently concentrates on the rounded corners and magnetic poles of the magnetic head, causing recording and reproducing problems. Therefore, there is a need for a configuration that eliminates the influence of such external magnetic flux.

[Conventional technology]

As shown in FIG. 3, a conventional magnetic head assembly includes two floating rails 12a provided on the medium facing surface of a floating slider 11 made of, for example, ceramic.

A recording/reproducing magnetic head 13 whose surface is covered with a thick insulating protective film (not shown) is provided on the air outflow end surface of one of the floating rails 12a (one of the floating rails 12b).

Also, a plurality of lead wire connection terminals 14 of the magnetic head 13
is exposed on the surface through the insulating protective film 14, and a lead wire 15 for connecting to a recording/reproduction control unit, etc. is connected to the connecting terminal 14, and the floating slider 1
1 is supported by a support spring 16.

[Problem that the invention seeks to solve]

By the way, in the conventional magnetic head assembly mentioned above, recording,
Or, during reproduction, leakage magnetic flux from an external source other than the magnetic disk medium, such as a head drive mechanism (voice coil motor, etc.), concentrates on the magnetic pole (not shown) of the magnetic head 13, and this is reproduced as noise. There is also the problem that the magnetization signal of the recorded medium is muffed.

In particular, as a magnetic head 13 in a magnetic head assembly,
As shown in the main part sectional view of FIG. 4, a main magnetic pole 21 for recording/reproducing and a thin film coil 23 sandwiched between an interlayer insulating layer 22 are provided on the air outflow end surface of at least one of the levitation rails 12a of the levitation slider 11. , an auxiliary magnetic pole 24 whose tip is retreated a predetermined distance inside from the medium facing surface of the tip of the cough main magnetic pole 21, and whose end opposite to the tip is connected to the first magnetic pole 21;
When a single-pole magnetic head for perpendicular magnetic recording is used, in which an insulating protective film 25 and an insulating protective film 25 are laminated in this order, the leakage magnetic flux from the outside is concentrated on the main pole 21, and the magnetic flux is transferred to the perpendicular magnetic disk medium. 26 and passes through the perpendicular magnetic recording layer 28 made of Co-Cr or the like to the soft magnetic backing layer 27 made of Ni-Fe or the like, there is a drawback that the magnetization information of the perpendicular magnetic recording layer 28 is easily lost. Ta.

In view of the above-mentioned conventional problems, an object of the present invention is to provide a novel magnetic head assembly that prevents the concentration of external magnetic flux on the magnetic poles of a magnetic head by a simple shielding structure and prevents any adverse effects on recording or reproduction. The purpose is to

[Means for solving problems]

In order to achieve the above object, the present invention includes a floating slider having a plurality of floating rails on a surface facing a recording medium, and an air outlet end surface of at least one floating rail of the floating slider is coated with an insulating protective film. In a head assembly including a magnetic head, the outer peripheral surface of the floating slider except for the surface facing the recording medium is covered with a soft magnetic material for shielding an external magnetic field.

[For production]

In the magnetic head assembly of the present invention, the side and back surfaces of the levitating slider provided with the magnetic head other than the medium facing surface are covered with a soft magnetic material for shielding external magnetic fields. It is absorbed into the magnetic material and is prevented from concentrating on the magnetic pole, especially the main magnetic pole, as in the conventional case. As a result, demagnetization or demagnetization of the information magnetization of the magnetic disk medium due to external magnetic flux is prevented.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic perspective view showing one embodiment of a magnetic head assembly according to the present invention.

In the figure, reference numeral 11 denotes a floating slider 11 equipped with, for example, two floating rails 12a and 12b on the side facing the medium, and air outflow from at least one of the two floating rails 12a and 12b. A recording/reproducing magnetic head 13 whose surface is covered with a thick insulating protective film (not shown) is provided on the end face.

A soft magnetic cover 3 for shielding external magnetic fields is formed of a thin plate made of, for example, Ni-Fe, so as to cover the side and back surfaces of the levitation slider 11 having the above configuration other than the medium facing surface.
1 is covered.

As shown in FIG. 2, the soft magnetic cover 31 has a rectangular shape that fits over the levitation slider 11, and the portions corresponding to the plurality of lead wire connection terminals 14 of the magnetic head 13 are cut out. and fits onto the floating slider 11;
After fixing, the lead wire 15 is connected to the connecting terminal 14, and the floating slider 11 is attached to the support spring 16.

With this configuration, leakage magnetic flux from the outside is absorbed by the soft magnetic cover 31 during recording and reproduction, and the magnetic pole of the magnetic head 13, especially the magnetic head 13, is used for single-pole type perpendicular magnetic recording. In this case, concentration on the main magnetic pole is prevented.

Therefore, it is possible to easily prevent external magnetic flux from being reproduced as noise and from demagnetizing the information magnetization of the magnetic disk medium.

In addition, in the above embodiment, an example was explained in which a soft magnetic cover for shielding an external magnetic field was used on the side surface and back surface other than the medium facing surface of the levitation slider, but the present invention is not limited to this example. Alternatively, a similar effect can be obtained by forming a soft magnetic film made of Ni-Fe or the like on the side and back surface of the levitating slider other than the medium facing surface by vapor deposition, sputtering, plating, etc. .

〔Effect of the invention〕

As is clear from the above description, the magnetic head assembly according to the present invention prevents the concentration of leakage magnetic flux from the outside on the magnetic pole, and prevents reproduction of noise caused by external magnetic flux, demagnetization and disappearance of magnetized information, etc. This can be easily prevented. Therefore, it has excellent advantages such as improving the quality and reliability of recorded or reproduced signals, and has a particularly significant practical effect when applied to magnetic head assemblies for single-pole type perpendicular magnetic recording. play.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view showing an embodiment of the magnetic head assembly according to the present invention, and FIG. 2 is for explaining the structure of the attachment of the soft magnetic cover for shielding external magnetic fields in the magnetic head assembly according to the present invention. 3 is a schematic perspective view showing an example of a conventional magnetic head assembly, and FIG. 4 is a schematic perspective view showing an example of a conventional magnetic head assembly for single-pole perpendicular magnetic recording. FIG. In FIGS. 1 and 2, 11 is a floating slider, 12a and 12b are floating rails,
13 is a magnetic head, 14 is a lead wire connection terminal, 15 is a lead wire, 16 is a support spring, and 31 is a soft magnetic cover for shielding an external magnetic field. Δ≦Toko≦Amem Het J Net η-S-Individuals C Go C 1 kg 11 years old 1 inkstone m Fig. 1〉Toi and θF4+=b ke 3 grass friend 4 average 4 shikafu 8 = each other igekoi G already moe tsm diagram 2

Claims (1)

[Claims] A plurality of floating rails (12a, 12b) are provided on the surface facing the recording medium.
) with a levitating slider (11);
11) In a head assembly comprising a magnetic head (13) provided on the air outflow end surface of at least one floating rail (12a) and covered with an insulating protective film, the floating slider (11) faces the recording medium. A magnetic head assembly characterized in that the outer peripheral surface except for the surface is covered with a soft magnetic material (31) for shielding an external magnetic field.