JP3040891B2 - Composite magnetic head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite magnetic head, and more particularly to a composite magnetic head having a recording head for recording magnetic information on a magnetic recording medium and a reproducing head for reproducing magnetic information on the magnetic recording medium. About the head.

[0002]

2. Description of the Related Art Conventionally, in a magnetic head for performing magnetic information processing such as recording and reproduction of information on a hard disk which is a magnetic recording medium of a magnetic recording device such as a computer, the magnetic head is in contact with the magnetic recording medium when stationary. A floating magnetic head which floats from a magnetic recording medium in an operating state and performs predetermined magnetic recording or reproduction is often used.

In such a magnetic head, if magnetic information is recorded and reproduced by one head, the reproduction output becomes small. Therefore, conventionally, a recording head and a reproducing head are combined. Composite type magnetic heads have been used.

In recent years, since the resolution of magnetic information processing is extremely high, and there is no dependence on the relative speed with respect to a magnetic recording medium, a magnetoresistive element (MR element) which is extremely effective for recent high-density recording. ) Using a magnetoresistive head has been developed. As the composite magnetic head, a normal magnetic head having a pair of cores on a recording side while using a magnetoresistive head on a reproducing side. A composite type magnetic head using a magnetic head has been developed.

FIG . 2 shows such a conventional composite magnetic head. This composite magnetic head 1 includes a reproducing magnetoresistive head 2 for reading magnetic information and a recording for writing magnetic information. And a normal magnetic head 3.

The magneto-resistance effect type head 2 is, for example,
A bias layer is formed on one side of the magnetoresistive film via a spacer layer, and has a magnetoresistive element 4 having a width substantially equal to the track width of a magnetic recording medium (not shown) such as a hard disk. This magnetoresistive element 4
The magnetic recording medium is disposed so as to be perpendicular to the magnetic recording medium and in the track width direction of the magnetic recording medium. Also,
On both sides of the magnetoresistive element 4, the width of the magnetoresistive element 4 is set so as to reach an adjacent track of the magnetic recording medium in order to increase the spatial resolution of the magnetic field detected by the magnetoresistive element 4. A pair of shields 5 and 5 having a large width dimension are disposed at a predetermined interval, and a constant voltage is applied to the magnetoresistive element 4 on both sides of the magnetoresistive element 4. (Not shown) for connection is connected.

On one side of the magnetoresistive head 2, a magnetic head 3 is provided. The magnetic head 3 has a pair of cores 6 and 6 around which coils (not shown) are wound.
have. A gap 7 is formed between the cores 6 at a position corresponding to the magnetoresistive element 4 of the magnetoresistive head 2.

In such a conventional composite type magnetic head, the composite type magnetic head 1 slides on the magnetic recording surface of the magnetic recording medium and is applied to the magnetoresistive effect element 4 of the magnetoresistive effect type head 2. By applying a bias voltage to the magnetoresistive element 4 by applying a predetermined voltage through the lead wire, the magnetic field generated from each track of the magnetic recording medium changes the resistance value of the magnetoresistive element 4, By detecting the strength of the magnetic field in accordance with the change in the resistance value, predetermined magnetic information is reproduced.

Further, predetermined magnetic information is recorded on a magnetic recording medium by the magnetic head 3.

[0010]

However, in the conventional composite type magnetic head, the reproduction track of the magnetoresistive head 2 and the recording track of the magnetic head 3 are located on the same track of the magnetic recording medium. This arrangement has a problem that the leakage magnetic field of the recording magnetic field generated at the time of recording the magnetic information has a bad influence on the magnetoresistive effect element 4, and as a result, the magnetoresistive head 2 Has the problem that the reproduction characteristics are significantly deteriorated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and can prevent a recording head from adversely affecting a reproducing head, thereby significantly improving reproduction characteristics, and appropriately cope with high-density magnetic recording. It is an object of the present invention to provide a composite magnetic head capable of performing the above-described operations.

[0012]

In order to achieve the above object, a composite magnetic head according to the present invention comprises a recording head for recording magnetic information on a magnetic recording medium and a reproducing head for reproducing magnetic information on the magnetic recording medium. And the reproducing head is provided on both sides of the magnetoresistive element .
A pair of shields are arranged with a predetermined interval
A magnetoresistive head;
Of the recording head with one core of the recording head.
And the other core of the recording head is
The pair of cores are disposed so as to face each other with a
A coil is wound therebetween, and the track positions of the recording head and the reproducing head are arranged so as to be shifted from each other in the track width direction of the magnetic recording medium.
That has a core function that faces the core through a gap
It is characterized in that the part is divided by forming a slit .

[0013]

According to the composite magnetic head of the present invention, the track positions of the recording head for recording magnetic information on the magnetic recording medium and the reproducing head for reproducing magnetic information on the magnetic recording medium are set to the track positions of the magnetic recording medium. offset arrangement in the width direction
At the same time, the shield is separated by the slit
Therefore, it is possible to reliably prevent the magnetism generated when the recording head records magnetic information from adversely affecting the reproducing head.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG.
The same parts as those described above are denoted by the same reference numerals and described.

FIG. 1 shows an embodiment of a composite magnetic head according to the present invention. This composite magnetic head 1 includes a read-side magnetoresistive head 2 for reading magnetic information of a magnetic recording medium and a magnetic head. And a normal magnetic head 3 on the write side for writing magnetic information on a magnetic recording medium.

The magnetoresistive head 2 is, for example,
The magnetoresistive element has a magnetoresistive element 4 having a bias layer formed on one side of a magnetoresistive film via a spacer layer. The magnetoresistive element 4 is perpendicular to a magnetic recording medium.
In addition, they are arranged so as to be located in the track width direction of the magnetic recording medium. On both sides of the magnetoresistive element 4, a pair of shields 5, 5 having a width larger than the width of the magnetoresistive element 4 are arranged at a predetermined interval. The magnetoresistance effect element 4
Are connected to lead portions (not shown) for applying a constant voltage to the magnetoresistive element 4.

A magnetic head 3 having a core 6 around which a coil (not shown) is wound is provided on one side of the magnetoresistive head 2. One shield 5 of the mold head 2 is commonly used as one core 6. Further, in the present embodiment, the gap 7 formed between the cores 6 of the magnetic head 3 is positioned in the track width direction of the magnetic recording medium with respect to the magnetoresistive element 4 of the magnetoresistive head 2. Are shifted from each other.

Further, in this embodiment, the magnetic resistance
One shield 5 of the anti-effect type head 2 has a slit 8
Are formed to form the core 6 of the magnetic head 3.
Function as a shield 5 of the magnetoresistive element 4
The part to be separated is designed to be separated.

Next, the operation of the present embodiment will be described.

In the present embodiment, the composite magnetic head 1 is moved to the magnetoresistive element 4 of the magnetoresistive head 2 while sliding the composite magnetic head 1 on the magnetic recording surface of the magnetic recording medium such as a hard disk. By applying a bias voltage to the magnetoresistive element 4 by applying a predetermined voltage through the lead wire, the magnetic field generated from each track of the magnetic recording medium changes the resistance value of the magnetoresistive element 4, By detecting the strength of the magnetic field in accordance with the change in the resistance value, predetermined magnetic information is reproduced.

The magnetic head 3 records predetermined magnetic information on a magnetic recording medium.

In this case, in this embodiment, the reproduction track by the magnetoresistive element 4 of the magnetoresistive head 2 and the recording track by the gap 7 of the magnetic head 3 are shifted in the track width direction of the magnetic recording medium. In this case, the magnetic field generated when the magnetic head 3 records magnetic information can be reliably prevented from adversely affecting the magnetoresistive element 4 of the magnetoresistive head 2. Has become.

The composite magnetic head 1 is driven and controlled on the basis of a predetermined servo signal from a predetermined control and drive circuit.
Since the reproduction track position and the recording track position are shifted in the track width direction, the magnetoresistive element 4 of the magnetoresistive head 2 is located at the track portion during reproduction, and the gap 7 of the magnetic head 3 is positioned at the track during recording. It is necessary to perform drive control so as to be located at the portion, and drive control must be performed by different servo signals during reproduction and during recording. For this reason, the drive control of the head becomes somewhat complicated, but the track width of the magnetic recording medium is extremely narrow at about 6 μm with the recent increase in density of magnetic information with respect to magnetism. Removal is an effective means for high-density recording and reproduction.

Further, in the present embodiment, the seal
The slit 8 formed in the magnetic head 5 allows the magnetic head 3
A) The shield 5 functioning as 6 is a magnetoresistive head.
It is surely separated from the second shield 5,
Thereby, the magnetoresistive head 2 and the magnetic head
3 can be reliably separated from the magnetic head 3.
Adverse effect on the magnetoresistive head 2 is further prevented.
Can be stopped.

Therefore, in this embodiment, the reproduction track of the magnetoresistive head 2 and the magnetic head 3
A recording track so as to form shifted in the track width direction of the magnetic recording medium by sealing the slit 8
Since the magnetic heads 5 are separated from each other, it is possible to reliably prevent magnetism generated when the magnetic head 3 records magnetic information from adversely affecting the magnetoresistive element 4 of the magnetoresistive head 2. In addition, the magnetic characteristics of the magnetoresistive head 2 can be significantly improved.

As shown in the reference diagram, the magnetic resistance
The slit 8 of one shield 5 of the effect type head 2 is provided.
Instead, the shield 5 can be formed integrally.

The present invention is not limited to the above-described embodiments, but can be variously modified as necessary, for example, by forming a magnetic head with a thin film head.

[0028]

As described above, in the composite magnetic head according to the present invention, the reproduction track by the reproduction head and the recording track by the recording head are formed so as to be shifted in the track width direction of the magnetic recording medium . By slit 8
Since the shield 5 is separated, it is possible to reliably prevent magnetism generated during recording of magnetic information by the magnetic head from adversely affecting the magnetoresistive element of the magnetoresistive head. The effect is that the magnetic characteristics of the mold head can be significantly improved.

[Brief description of the drawings]

FIG. 1 is a plan view showing a composite magnetic head according to the present invention.

FIG. 2 is a plan view showing a conventional composite magnetic head.

[Reference figure] Plan view showing a reference example of the present invention.

[Explanation of symbols]

 Reference Signs List 1 composite type magnetic head 2 magnetoresistive head 3 magnetic head 4 magnetoresistive element 5 shield 6 core 7 gap 8 slit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B 5/265 G11B 5/39

Claims (1)

(57) [Claims] 1. A composite magnetic head comprising: a recording head for recording magnetic information on a magnetic recording medium; and a reproducing head for reproducing magnetic information on the magnetic recording medium .
The head has a pair of shields on both sides of the magnetoresistive element.
Magneto-resistive heads arranged at regular intervals
And one shield of the magnetoresistive head.
Is shared as one core of the recording head,
The other core of the recording head faces through a gap
And a coil is wound between the pair of cores.
Wound, the track positions of the recording head and the reproducing head are arranged offset in the track width direction of said magnetic recording medium, the other core and the gap of the one shield
The part with the core function facing through forms a slit
A composite type magnetic head characterized in that it is divided into two .