JPH0643806U - Magnetic head - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a magnetic head mounted in a hard disk device, and an object thereof is to shield noise from the outside. A slider 13 at least a part of which is formed of a magnetic material and on which air bearing surfaces 14 and 15 for floating are formed, and a portion of the slider 12 where the magnetic material is arranged. And a yoke 12 that is butted to form a magnetic gap. Then, the air bearing surfaces 14 and 15 of the slider and the yoke
The shield layer 21 that shields the external induction magnetic field is integrally formed on the back surface which is at least one surface other than the above.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a magnetic head mounted on a hard disk device.

[0002]

[Prior art]

 Generally, a hard disk drive device is known as a storage device such as a computer and a word processor. To briefly explain this hard disk drive device, an actuator in which a magnetic head is attached to a spring arm at the tip of an arm is driven to rotate by a voice coil motor (VCM) and is rotated by a spindle motor. It is located on a predetermined track.

In this case, an air flow is generated in the circumferential direction of the rotating magnetic disk, and the air flow is generated between the magnetic disk and the air bearing surface formed on the magnetic head. The magnetic head floats, and magnetic recording / reproducing processing is performed in this floating state.

Therefore, FIG. 3 shows a perspective view of a conventional magnetic head, and FIG. 4 shows a perspective view of the back surface of FIG. The magnetic head 11 of FIGS. 3 and 4 is called a monolithic type.

In the figure, 12 is a yoke, 13 is a slider for floating the magnetic head from the disk surface, and this slider 13 also functions as the core of the magnetic head. Therefore, both the yoke 12 and the slider 13 are made of a soft magnetic material (Mn-Zn ferrite, etc.).

Further, the slider 13 has air bearing surfaces 14 and 15 for floating, and air grooves 16 and 17 having a rectangular cross section for improving stability during floating. There is. The corners of the air bearing surfaces 14 and 15 and the corners 14a to 17a of the air grooves 16 and 17 are chamfered for smoothing the air flow. Reference numerals 18 and 19 denote inclined surfaces for guiding the air flow generated by the rotation of the magnetic disk during magnetic recording and reproduction to the air bearing surfaces 14 and 15, and 12a a center rail that cooperates with the yoke 12 to form a magnetic gap. , 20 are coils wound around the yoke 12.

As shown in FIG. 4, the back surface of the magnetic head 11 is a surface of a soft magnetic material forming a head core, and this surface is bonded to a spring arm (suspension). The coil 20 is omitted in FIG.

[0008]

[Problems to be solved by the device]

 By the way, the coil 20 shown in FIG. 3 is wound around the yoke 12 by a so-called stagger winding method, and is easily affected by noise (external induction magnetic field). As a result, there is a problem that an error due to noise occurs during recording and reproduction. Therefore, the present invention has been made in view of the above problems, and an object thereof is to provide a magnetic head that shields noise from the outside.

[0009]

[Means for Solving the Problems]

 The above-mentioned problem is caused by a slider having an air bearing surface for floating and a yoke having a magnetic gap formed therein and mounted in the slider, or a yoke abutted with the slider to form a magnetic gap. In the constructed magnetic head, the problem can be solved by integrally forming a shield layer for shielding an external induction magnetic field on at least one surface other than the air bearing surface of the slider and the yoke.

[0010]

[Action]

 As mentioned above, the shield layer is integrally formed on at least one surface other than the air bearing surface. That is, by shielding the external induction magnetic field with this shield layer, it is possible to prevent the occurrence of an error during recording / reproduction in the magnetic head.

[0011]

【Example】

 FIG. 1 shows a block diagram of an embodiment of the present invention, and FIG. 2 shows a perspective view of the back surface of FIG. The same components as those in FIG. 3 are designated by the same reference numerals.

FIG. 1 is a perspective view of a magnetic head, which is of a monolithic type. 1 and 2, a magnetic head 11 is composed of a slider 13 at least a part of which is made of a soft magnetic material (for example, Mn-Zn ferrite) and a magnetic material (for example, Mn-Zn ferrite). And a yoke 12 which is abutted with the portion of the magnetic material 13 where the magnetic material is disposed to form a magnetic gap 12b.

On one surface of the slider 13, air bearing surfaces 14 and 15 are formed on both sides of the center rail 12a via air grooves 16 and 17 in the center. A magnetic gap 12b is formed between the center rail 12a and the yoke 12.

Further, inclined surfaces 18 and 19 are formed at one end of the air bearing surfaces 14 and 15 (the end opposite to the magnetic gap 12b), and the air bearing surfaces 14 and 15 and the air grooves 16 and 17 are formed. The corners 14a to 17a of the (center rail 12a) are each chamfered to smooth the air flow. That is, the inclined surfaces 18 and 19 guide the flow of air to the air bearing surfaces 14 and 15 to make them float, and the rectangular air grooves 16 and 17 having a cross-sectional surface at the time of floating improve the floating stability.

The coil 20 is wound (staggered) in the coil winding groove 12c (see FIG. 2) of the yoke 12. The coil 20 is omitted in FIG.

On the other hand, the shield layer 21 is integrally formed on the surface of the slider 13 opposite to the surface on which the air bearing surfaces 14, 15 are formed, that is, the entire back surface. In this shield layer 21, a non-magnetic layer (for example, SiO ₂ or the like) 21a and a magnetic layer (for example, Fe—Ni-based alloy or the like) 21b are sequentially formed by, for example, a film forming method. As a film forming method, there are a general sputtering method, a vapor deposition method, and an ion plating method.

For example, the sputtering method will be briefly described. On the back surface of the slider 13, that is, the soft magnetic material surface, a metal molecule of SiO ₂ is attached by glow discharge to form a nonmagnetic layer 21a. The magnetic layer 21b is formed by depositing metal molecules of an Fe-Ni alloy on the layer 21a by glow discharge.

When such a magnetic head 11 is mounted on a hard disk drive device, it is attached to the spring arm at the tip of the arm by an adhesive on the surface of the shield layer 21.

As a result, noise from the outside (external induction magnetic field) can be shielded by being grounded by the shield layer 21 via the spring arm, and an error can be prevented from occurring during recording and reproduction. Is what you can do.

Next, another embodiment of the shield layer 21 will be described. Although it has been described that the shield layer 21 is formed by film formation, a nonmagnetic foil such as Cu is adhered to the entire back surface of the slider 13 to form the nonmagnetic layer 21a, and the Fe layer is formed on the nonmagnetic layer 21a. The same effect can be obtained by forming a magnetic layer 21b by bonding a foil of a Ni-based alloy.

If a non-magnetic adhesive material is used for the non-magnetic layer 21a, the magnetic layer 21a may be directly adhered to the entire back surface of the slider 13 with the adhesive.

In these cases, the non-magnetic layer 21a and the magnetic layer 21b do not have to be two layers and may be laminated in three or more layers depending on the situation.

In the above embodiment, the case where the shield layer 21 is formed on the back surface of the slider 13 is shown. However, by forming the shield layer on the side surface, that is, the surface other than the air bearing surfaces 14 and 15, The shield effect can be enhanced. Further, in the above embodiment, the magnetic head 11 is described as a monolithic type, but it is needless to say that the same effect can be obtained also with a composite type.

[0024]

[Effect of device]

 As described above, according to the present invention, a shield layer for shielding an external induction magnetic field is integrally formed on at least one surface other than the air bearing surface of the slider and the yoke, so that noise from the outside can be easily shielded. It is possible to prevent recording / reproducing errors.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a perspective view of the back surface of FIG.

FIG. 3 is a perspective view of a conventional magnetic head.

FIG. 4 is a perspective view of the back surface of FIG.

[Explanation of symbols]

 11 Magnetic Head 12 Yoke 12a Center Rail 12b Magnetic Gap 13 Slider 14,15 Air Bearing Surface 16,17 Air Groove 18,19 Inclined Surface 20 Coil 21 Shield Layer 21a Nonmagnetic Layer 21b Magnetic Layer

Claims (1)

[Scope of utility model registration request] 1. A slider comprising an air bearing surface for floating, and a yoke having a magnetic gap formed therein and mounted in the slider, or a yoke formed in abutment with the slider to form a magnetic gap. In the magnetic head described above, a shield layer that shields an external induction magnetic field is integrally formed on at least one surface other than the air bearing surfaces of the slider and the yoke.