JPH0676256A - Magnetic head assembling body - Google Patents

Abstract

PURPOSE:To eliminate superposition of noise into an electromagnetic converter in a servo head slider and to reduce a positioning error by interrupting electromagnetic wave generating from a coil in the electromagnetic converter when the electromagnetic converter writes information. CONSTITUTION:The electromagnetic wave is generated from the coil in the converter 13 when the information is written by the electromagnetic converter 13 on a data head slider 11. The electromagnetic wave generated from the converter 13 when the information is written by the converter 13 on the slider 11 is interrupted by a shield plate 1 joined on a servo head gimbals assembling body 4 on the electromagnetic converter 13 on the slider 11. The electromagnetic wave generated from the coil in the converter 13 when the information is written by the converter 13 on the slider 11 is possessed of electric field and magnetic field. In such a case, when the quality of the material of the plate l is made of magnetic substance, the electromagnetic field from a low frequency to a high frequency is interrupted effectively. Further, when the plate 1 is made of a laminated plate with the magnetic substance and a conductive metal, the electromagnetic wave is interrupted more effectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head assembly used in a magnetic disk device.

[0002]

2. Description of the Related Art A conventional magnetic head assembly includes one servo head gimbal assembly having a servo head slider for reading servo information and a plurality of data having a data head slide for writing / reading information. A head gimbal assembly is fixed to the arm of the carriage, and is inserted between a plurality of magnetic disks stacked on a spindle that rotates with high precision. FIG. 3 shows a servo head gimbal assembly fixed on the same arm of a conventional carriage.

[0003]

Recently, as the storage capacity of the magnetic disk device has increased, the shape of the magnetic head slider has become smaller, and the thickness of the carriage arm has also become thinner in order to increase the number of magnetic disks. As shown in FIG. 4, the space between magnetic disks tends to be narrowed. When the distance between the magnetic disk plates becomes narrow and the servo head slider and the data head slider come close to each other in this way, the electromagnetic transducer of the servo head slider can easily pick up the electromagnetic waves generated when writing information with the electromagnetic transducer of the data head slider. However, the electromagnetic information generated by the electromagnetic transducer of the data head slider is superposed as noise on the servo information read by the electromagnetic transducer of the servo head slider, resulting in a large positioning error.

[0004]

SUMMARY OF THE INVENTION The present invention is a servo head gimbal assembly having a servo head slider for reading servo information and at least one data head gimbal having a data head slider for writing / reading information. In a magnetic head assembly for fixing the assembly to the arm tip, a magnetic or conductive plate-like member that is located approximately in the middle of the servo head slider and the data head slater and is fixed on the servo head gimbal assembly. Is equipped with.

Further, a magnetic material which is located approximately in the middle of the servo head slider and the data head slider and which is fixed on the data head gimbal assembly fixed to the surface opposite to the arm on which the servo head gimbal assembly is mounted. Alternatively, a conductive plate-shaped member may be provided, and the magnetic or conductive plate-shaped member may be a laminated plate composed of a magnetic and conductive plate-shaped member.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

In the magnetic head assembly, one servo head gimbal assembly and a plurality of data head gimbal assemblies are fixed to the arm on a carriage having at least one arm, and a preset arm of the carriage is provided. The servo head gimbal assembly and the data head gimbal assembly are fixed to each other.

1A and 1B are a plan view and a side view showing an embodiment of a magnetic head assembly of the present invention.
In the magnetic head assembly of this embodiment, as shown in FIG. 1, a servo head gimbal assembly 4 and a data head gimbal assembly 12 are attached to a preset arm 9 of a carriage (not shown). It is fixed through 8.

The servo head gimbal assembly 4 includes a mounting piece 8 for fixing the servo head gimbal assembly 4 to the arm 9, an elastic spring portion 7 for supplying a load load to the servo head slide 3, and a beam portion 6. , The flange portion 5, and the servo head slider 3 is mounted via a gimbal spring. A magnetic plate or a conductive metal plate (hereinafter referred to as a shield plate) 1 is bonded onto a servo head gimbal assembly 4.

The material of the shield plate 1 is, for example, Ni.
Magnetic material such as Fe alloy, sendust, ferrite, or
It is a conductive metal such as Cu, Al, or a stainless alloy. Further, it may be a laminated plate of a magnetic material and a conductive metal such as a Cu-NiFe alloy laminated plate. Furthermore, the shield plate 1
The dimension is such that the elastic spring portion 7 of the slider support 4 is not overloaded and that the electromagnetic transducer 13 of the servo head slider 3 is sufficiently covered so that the vertical dimension is 2.5 mm and the horizontal dimension is 2.5 mm. The thickness was 4.0 mm and the thickness was 0.07 mm.

As shown in FIGS. 2A and 2B, the welding position and the welding method of the shield plate 1 are as follows: the flange of the servo head gimbal assembly 4 above the electromagnetic converter 13 fixed to the servo head slider 3. Mounted on the part 5 by glue or laser welding. In addition to the flat plate shape shown in FIGS. 2 (a) and 2 (b), the shield plate 1 has a flange of the servo head gimbal assembly 4 as shown in FIGS. 3 (a) and 3 (b). It may have a shape along the portion 5 (see the shield plate 1a).

The data head slider 1 is provided on the surface opposite to the preset arm 9 to which the servo head gimbal assembly 4 having the servo head slider 3 mounted thereon is fixed.
The data head gimbal assembly on which 1 is mounted is fixed. Electromagnetic converter 13 of this data head slider 11
Generates electromagnetic waves from the coil of the electromagnetic converter 13 when writing information. The shield plate 1 joined to the servo head gimbal assembly 4 above the electromagnetic converter 13 of the servo head slider 3 is a coil of the electromagnetic converter 13 when the electromagnetic converter 13 of the data head slider 11 writes information. It plays the role of blocking the electromagnetic waves generated from the. The electromagnetic wave generated from the coil of the electromagnetic converter 13 when the electromagnetic converter 13 of the data head slider 11 writes information has two fields, an electrolytic field and a magnetic field.

In this case, if the shield plate 1 is made of a magnetic material (for example, NiFe alloy), it can effectively block an electromagnetic field from a low frequency to a high frequency, and a conductive metal (for example, Even Cu, etc.) can be sufficiently shielded by a high frequency electromagnetic field. Further, by forming the shield plate 1 as a laminated plate of a magnetic material and a conductive metal (for example, a laminated plate of Cu—NiFe alloy), electromagnetic waves can be effectively blocked.

A data head gimbal assembly 12 in which a servo head gimbal assembly 4 having the servo head slater 3 mounted thereon is fixed to a preset arm and is fixed to the opposite surface of the arm 9. On top,
The same effect can be obtained by joining the electromagnetic converter 13 upper shield plate 1 of the data head slider 11 mounted thereon.

[0015]

As described above, the present invention is provided on the servo head gimbal assembly above the electromagnetic transducer of the servo head slider, or on the opposite surface of the preset arm to which the servo head gimbal assembly is fixed. The shield plate that is mounted on the data head gimbal assembly that is fixed to and is bonded to the data head gimbal assembly above the electromagnetic transducer of the data head slider is fixed to the servo head gimbal assembly in advance. When the electromagnetic transducer of the data head slider mounted on the data head gimbal assembly, which is fixed to the opposite surface of the arm, writes information, it blocks the electromagnetic waves generated from the coil of the electromagnetic transducer. Noise is not superposed on the electromagnetic transducer of the servo head slider, which has the effect of reducing positioning errors. .

[Brief description of drawings]

1A and 1B are a plan view and a side view showing an embodiment of the present invention.

2A and 2B are a side view and a view seen from an arrow A showing a part of the shield plate in FIG.

3A and 3B are a side view and a B arrow view showing a shield plate portion of another embodiment.

FIG. 4 is a side view showing a conventional example.

FIG. 5 is a side view showing a conventional example (when the space between magnetic disks is narrow).

[Explanation of symbols]

 1, 1a Shield plate 2 Gimbal spring 3 Servo head slider 4 Servo head gimbal 5 Flange part 6 Beam part 7 Elastic spring part 8 Mounting piece 9 Arm 10 Magnetic disk 11 Data head slider 12 Data head gimbal assembly 13 Electromagnetic transducer

Claims (3)

[Claims] 1. A servo head gimbal assembly equipped with a servo head slider for reading servo information and at least one data head gimbal assembly equipped with a data head slider for writing / reading information are fixed to the arm tip. In the magnetic head assembly to
A magnetic head assembly comprising a magnetic or conductive plate-like member that is positioned approximately in the middle of the servo head slider and the data head slider and that is fixed onto the servo head gimbal assembly. 2. A servo head gimbal assembly equipped with a servo head slider for reading servo information and at least one data head gimbal assembly equipped with a data head slider for writing / reading information are fixed to an arm tip. In the magnetic head assembly to
A magnetic member fixed to the data head gimbal assembly which is located approximately in the middle of the servo head slider and the data head slider and which is fixed to the opposite surface of the arm on which the servo head gimbal assembly is mounted. A magnetic head assembly comprising a conductive plate member. 3. The magnetic or conductive plate-shaped member,
3. The magnetic head assembly according to claim 1, wherein the magnetic head assembly is a laminated plate including the magnetic and conductive plate members.