JPH1131305A - Magnetic head device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely shield magnetically between a plurality of magnetic heads by providing the plurality of magnetic heads arranged in the traveling direction of a magnetic recording medium and providing at least a coil between a reproducing magnetic head and a recording magnetic head. SOLUTION: A substrate 8A, a recording magnetic head 5, a coil 7, a reproducing magnetic head 6 and a substrate 8B are formed in parallel to the traveling direction arrow A of a magnetic tape. A prescribed current is supplied to a recording coil 14 in recording, and at this point, a part of an AC magnetic field generated from the recording coil 14 and a magnetic gap G is leaked out from the recording magnetic head 5. This leakage magnetic field is electromagnetically converted by the coil 7 to become a current flowing to the coil 7 and the vertical component of the leakage magnetic field is canceled by the coil 7 not to reach the reproducing magnetic head 6. Thus, the magneto-resistive effect element 16 of the reproducing magnetic head 6 can detect the signal magnetic field of the magnetic tape without being interfered with the leakage magnetic field.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head device constructed by combining a plurality of magnetic heads.
In particular, the present invention relates to a magnetic head device in which a pair of magnetic heads for reproduction are arranged via a magnetic head for recording.

[0002]

2. Description of the Related Art Conventionally, a computer or the like is equipped with a storage device for backing up various information, and a data cartridge having a larger capacity than a hard disk or the like has been used. The data cartridge has a tape-shaped magnetic recording medium housed therein, and a magnetic signal is recorded and reproduced on the tape-shaped magnetic recording medium running at a high speed, thereby backing up information signals. Is what you do.

The data cartridge containing the tape-shaped magnetic recording medium employs a so-called read-after-write system. Usually, a magnetic head for recording and a magnetic head for reproduction are arranged in the tape running direction. Recording and reproduction are performed by the magnetic head device thus constructed.

In this magnetic head device, immediately after the recording magnetic head records the magnetic signal on the tape-shaped magnetic recording medium, the reproducing magnetic head reproduces the recorded magnetic signal.

[0005]

In the magnetic head device as described above, the distance between the magnetic gap of the recording magnetic head and the magnetic gap of the reproducing magnetic head is limited. It cannot be increased. Accordingly, when a magnetic signal is recorded by a recording magnetic head and a magnetic signal is reproduced by a reproducing magnetic head at the same time, a magnetic field generated from the recording magnetic head adversely affects the reproducing magnetic head. As a result, the cross-feed characteristic of the reproducing head deteriorates,
There is a problem that the magnetic signal cannot be reproduced accurately.

In order to solve this problem, in a conventional magnetic head device, a metal plate such as a copper plate having a low resistance is arranged between a magnetic head for recording and a magnetic head for reproduction. In the conventional magnetic head device, the magnetic field generated from each magnetic head is shielded by the metal plate.

However, in such a magnetic head device, a magnetic field generated from a recording magnetic head cannot be sufficiently shielded, and a magnetic field is applied to an adjacent magnetic head. For this reason, the conventional magnetic head device has a problem that the reproducing magnetic head receives signal interference due to the magnetic field generated from the recording magnetic head, and the reproducing output is reduced.

The present invention has been made in view of the above-described problems, and has as its object to provide a magnetic head device in which a plurality of magnetic heads are reliably magnetically shielded.

[0009]

A magnetic head device according to the present invention that has achieved the above-mentioned object has at least a reproducing magnetic head and a recording magnetic head, and is provided with a plurality of magnetic heads arranged in a running direction of a magnetic recording medium. Magnetic heads and at least a coil formed between the reproducing magnetic head and the recording magnetic head.

In the magnetic head device according to the present invention configured as described above, a magnetic field is generated from a predetermined recording magnetic head among the plurality of magnetic heads. In this magnetic head device, the magnetic field generated in this way is absorbed by the coil. That is, a magnetic field from an adjacent magnetic head is applied to the coil, and a predetermined current flows. Thus, in the magnetic head device according to the present invention,
The coil can efficiently shield the magnetic field generated from the adjacent magnetic head.

If the current supplied to the coil has an opposite phase to the current used for the recording magnetic head, a magnetic field is generated from the coil so as to cancel the magnetic field generated from the recording magnetic head. Therefore, in this magnetic head, the shielding efficiency is greatly improved by using the coil in the magnetic head device as compared with the case where the conventional plate-shaped shielding plate is used.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a magnetic head device according to the present invention will be described below in detail with reference to the drawings.

As shown in FIG. 1, a magnetic head device according to the present invention has a first magnetic head 1 having a recording magnetic head and a reproducing magnetic head therein, and a recording magnetic head therein. A second magnetic head 2 having a magnetic head for reproduction and a pair of outriggers 3A and 3B sandwiching the first magnetic head and the second magnetic head 2. That is, the magnetic head device is provided with the outrigger 3
A, a first magnetic head 1, a second magnetic head 2, and an outrigger 3B are arranged in parallel in this order.
Although not shown, the magnetic head device may have a support member for supporting the first magnetic head 1, the second magnetic head 2, and the outriggers 3A and 3B. In this magnetic head device, the magnetic recording medium 4 runs in the direction indicated by the arrow A or the arrow B in FIG.

In this magnetic head device, the first magnetic head 1 is used when the magnetic recording medium 4 travels in the direction indicated by the arrow A in FIG. 1, and as shown in FIG. A head 5, a reproducing magnetic head 6, and a coil 7 are provided. In the first magnetic head 1, the recording magnetic head 5 and the reproducing magnetic head 6 are sandwiched between a pair of substrates 8A and 8B. That is, in the first magnetic head 1, the substrate 8A, the recording magnetic head 5, the coil 7, the reproducing magnetic head 6, and the substrate 8B are arranged in this order in parallel with the running direction of the magnetic recording medium 4 indicated by the arrow A. They are formed in parallel.

In this magnetic head device, the second
The magnetic head 2 is used when the magnetic recording medium 4 travels in the direction indicated by the arrow B in FIG. 1, and has a recording magnetic head 9, a reproducing magnetic head 10, and a coil 11 as shown in FIG. And In the second magnetic head 2, the recording magnetic head 9 and the reproducing magnetic head 10
Are sandwiched between a pair of substrates 12A and 12B.
That is, in the second magnetic head 2, the arrow B
In parallel with the running direction of the magnetic recording medium 4 indicated by
A, a recording magnetic head 9, a coil 11, a reproducing magnetic head 10, and a substrate 12B are formed in parallel in this order.

In the first magnetic head 1 shown in FIG. 2, the recording magnetic head 5 includes a first magnetic film 13, a recording coil 14 formed on the first magnetic film 13,
A second magnetic core which is in contact with the first magnetic film 13 at substantially the center of the recording coil 14 and forms a magnetic core together with the first magnetic film 13.
And the magnetic film 15. The recording magnetic head 5 is formed so that its periphery is embedded with a non-magnetic material, and the first magnetic film 13 and the second magnetic film 15 are non-magnetic on the surface on which the magnetic recording medium 4 slides. The magnetic gap G is formed by abutting the materials.

In the first magnetic head 1,
The reproducing magnetic head 6 includes a magnetoresistive element 16 for detecting a signal magnetic field generated from the magnetic recording medium 4, and a first shield layer 17 and a second shield disposed so as to sandwich the magnetoresistive element 16. And a layer 18. The recording magnetic head 6 is configured such that the magnetoresistive element 16 serves as a magnetic sensing part, and a first shield layer 17 and a second shield layer 18 draw a magnetic field other than a signal magnetic field.

Further, in the first magnetic head 1, the coil 7 is formed between the recording magnetic head 5 and the reproducing magnetic head 6. As shown in FIG. 4, the outer end 7A of the coil 7 is connected to the first magnetic layer 13, and the inner end 7B is connected to the second shield layer 18, as shown in FIG. . Therefore, the current flowing through the coil 7 is
Discharge occurs from the end 7A to the first magnetic layer 13 or from the end 7B to the second shield layer 18.

On the other hand, in the second magnetic head 2 shown in FIG. 3, the recording magnetic head 9 has the same configuration as the recording magnetic head 5 in the first magnetic head 1 described above.
A first magnetic film, a recording coil formed on the first magnetic film, and a first magnetic film in contact with the first magnetic film at substantially the center of the recording coil; 20 and a second magnetic film 22 constituting a magnetic core.
The recording magnetic head 9 is formed so as to be embedded with a non-magnetic material, and the first magnetic layer 20 and the second
And the magnetic layer 22 constitute a magnetic gap G.

In the second magnetic head 2,
The reproducing magnetic head 10 includes the first magnetic head 1 described above.
The magnetoresistive element 23 detects the signal magnetic field generated from the magnetic recording medium as in the case of the reproducing magnetic head 6 of FIG.
And a first shield layer 24 and a second shield layer 25 arranged so as to sandwich the magnetoresistive element 23.

Further, in the second magnetic head 2, the coil 11 is formed between the recording magnetic head 9 and the reproducing magnetic head 10, like the first magnetic head 1 described above. The outer end of the coil 11 has a first end.
And the inner peripheral end is connected to the second shield layer 25. Therefore, the coil 1
1 is discharged from the first magnetic layer 20 or the second shield layer 25.

In this magnetic head device, four recording tracks are formed in parallel with the longitudinal direction of the magnetic recording medium 4. Therefore, four magnetic heads 5 for recording and four magnetic heads 6 for reproduction are formed in the first magnetic head 1. That is, the first magnetic head 1
As shown in FIG. 4, four recording magnetic heads 5 (5A, 5B, 5C, 5D) forming these recording tracks, and four reproducing magnetic heads 6 adjacent to the four recording magnetic heads 5 are provided. (6A, 6B, 6C, 6D). That is, in the first magnetic head 1, the magnetic recording medium 4
The magnetic gap G of the recording magnetic head 5 is formed at a predetermined interval in a direction orthogonal to the traveling directions A and B of the recording head. The four reproducing magnetic heads 6 are formed such that each magnetoresistive element 16 is located at a stage subsequent to the magnetic gap G.

Similarly, the second magnetic head 2 includes:
Four recording magnetic heads 9 and four reproducing magnetic heads 10 are formed. That is, the second magnetic head 2
In order to form four recording tracks on the magnetic recording medium 4 when the magnetic recording medium 4 travels in the direction of arrow B, four recording magnetic heads 9 (9A, 9B, 9C, 0
D). The second magnetic head 2 includes four reproducing magnetic heads 10 (10A, 10B) located behind four magnetic gaps G formed in a direction perpendicular to the running direction B of the magnetic recording medium 4. , 10C, 10D).

In the magnetic head device configured as described above, the magnetic recording medium 4 travels in the direction shown by the arrow A or the arrow B in FIG. 1, and an information signal is transmitted to the traveling magnetic recording medium 4 as a magnetic signal. It records and reproduces a magnetic signal recorded on the magnetic recording medium 4. The magnetic recording medium 4 comes into contact with the magnetic head device such that its longitudinal direction is parallel to the directions indicated by arrows A and B in FIG. At this time, the magnetic recording medium 4 is urged by an urging means (not shown) provided via the magnetic head device so as to press the magnetic head device.

In this magnetic head device, a magnetic signal recorded by the recording magnetic head is immediately reproduced by the reproducing magnetic head by a so-called read-after-write method. When the magnetic recording medium 4 travels in the direction indicated by arrow A in FIG. 1, recording and reproduction are performed by the first magnetic head. When traveling in the direction indicated by arrow B in FIG. Performs recording and reproduction.

That is, when the magnetic recording medium 4 travels at a high speed in the direction indicated by the arrow A in FIG. 1, the magnetic signal recorded by the recording magnetic head 5 is immediately reproduced by the reproducing magnetic head 6 located at the subsequent stage. Is done. On the other hand, when the magnetic recording medium 4 travels at a high speed in the direction indicated by the arrow B in FIG.
The magnetic signal recorded by the recording magnetic head 9 is immediately reproduced by the reproducing magnetic head 10 located at the subsequent stage.

At this time, in the recording magnetic heads 5, 9,
At the time of recording, a predetermined current is supplied to the recording coils 14 and 21, and a predetermined AC magnetic field is generated from the recording coils 14 and 21. Accordingly, the magnetic cores of the recording magnetic heads 5 and 9 are magnetized to generate a predetermined alternating magnetic field from the magnetic gap G. Then, the AC magnetic field generated from the magnetic gap G is applied to the magnetic recording medium 4 to form a recording track.

At this time, a part of the AC magnetic field generated from the recording coils 14 and 21 and a part of the AC magnetic field generated from the magnetic gap G may leak from the recording magnetic heads 5 and 9.

In this magnetic head device, the above-described leakage magnetic field is electromagnetically converted by the coils 7 and 11 into a current flowing through the coils 7 and 11. That is, the leakage magnetic field is
The vertical component is canceled by the coils 7 and 11, and does not reach the reproducing magnetic heads 6 and 10.

Thus, in the magnetic head device, the magnetic field generated from the recording magnetic heads 5, 9 is not applied to the reproducing magnetic heads 6, 10, and the reproducing magnetic heads 6, 10 are reproduced. It can be performed. For this reason, in the reproducing magnetic heads 6 and 10, the magnetoresistive effect elements 16 and 23, which are magnetically sensitive portions, can detect the signal magnetic field without being interfered by a magnetic field other than the signal magnetic field. Therefore, in this magnetic head device, the reproduction output is greatly improved.

Incidentally, in this magnetic head device, it is preferable that the coils 7 and 11 are formed near the surface on which the magnetic recording medium 4 slides. Thereby, the coils 7, 11
Thus, the leakage magnetic field applied from the sliding surface of the magnetic recording medium 4 can be reliably canceled. Also, this coil 7,
Since 11 is formed near the magnetoresistive elements 16 and 23, the magnetism can be more reliably shielded.

The coils 7, 11 are preferably made of a material having a low resistivity, such as copper. In this magnetic head device, when a material having a low resistivity is used for the coils 7 and 11, the electromagnetic conversion efficiency with respect to the leakage magnetic field is improved, so that the leakage magnetic field can be more reliably shielded. Since the amount of heat generated from 7 and 11 can be suppressed low, the adverse effect on the magnetic head device can be reduced.

Further, in this magnetic head device, the thickness of the coils 7 and 11 is small because the leakage magnetic field generated from the recording magnetic heads 5 and 9 is small.
The thickness of the material for forming the layer 1 should not exceed the saturation current density.

On the other hand, the magnetic head device according to the present invention is not limited to the magnetic head device provided with the first magnetic head 1 and the second magnetic head 2 as described above, but as shown in FIG. May be something.

The magnetic head device shown in FIG. 6 includes a recording magnetic head 30 (hereinafter simply referred to as a recording head 30) and a recording head 30 through the recording head 30 in a direction indicated by G in FIG. A pair of reproducing magnetic heads 31A and 31B (hereinafter simply referred to as reproducing heads 31A and 3B) disposed in parallel.
Called 1B. ). In addition, the magnetic head device includes an erasing magnetic head 32 (hereinafter, simply referred to as an erasing head 32) disposed to face the recording head 30 via one reproducing head 31A, and the other reproducing head 31.
An outrigger 33 is provided to face the recording head 30 via B. Furthermore, this magnetic head device
A support member is provided for integrally supporting the recording head 30, the pair of reproducing heads 31A and 31B, the erasing head 32, and the outrigger 33. This magnetic head device includes coils formed between the reproducing head 31A and the recording head 30 and between the reproducing head 31B and the recording head 30, respectively.

That is, the magnetic head device according to the present embodiment comprises an outrigger, a reproducing head 31B, and a recording head 3B.
0, a reproducing head 31A and an erasing head 32 are attached to the support member 35 in this order, and the reproducing head 3
Coils are arranged between the recording head 1B and the recording head 30 and between the recording head 30 and the reproducing head 31A, respectively.

In the magnetic head device, the reproducing head 31B, the recording head 30, and the reproducing head 31A are joined in this order. For this reason, in the magnetic head device, regardless of the direction in which the magnetic recording medium 4 travels, immediately after the magnetic signal recorded by the recording head 30 is recorded, one of the reproducing heads 31A and 31B performs magnetic recording. The signal is reproduced.

In this magnetic head device, the recording head 30
And coils between the recording head 30A and the reproducing head 31B, and between the recording head 30 and the reproducing head 31B.
The AC magnetic field generated from the recording coil of the recording head 30 is not electromagnetically converted by the coil and leaks. Thereby, in the magnetic head device 1, the reproducing head 31
A, 31B can reproduce a magnetic signal recorded on the magnetic recording medium 4 without being adversely affected by the magnetic field.

In the magnetic head device according to the above-described embodiment, the reproducing head 31A and the erasing head 3
No coil was arranged between them. However, the magnetic head device may have a configuration in which a coil is arranged between the reproducing head 31A and the erasing head 32. At this time, in the composite magnetic head, the reproducing head 31
A, a magnetic field generated from the erasing head 32 causes the reproducing head 31
A does not leak. Thereby, the magnetic head device can perform recording and reproduction of the magnetic recording medium more favorably.

The magnetic head device according to the present invention is not limited to the magnetic head device having the above-described configuration. That is, the magnetic head device according to the present invention may be a magnetic head device in which one magnetic head for recording and one magnetic head for reproduction are joined. Also in this case, the coil is disposed between the magnetic head for recording and the magnetic head for reproduction, and can cancel the magnetic field generated from the magnetic head for recording. Therefore, this magnetic head device can satisfactorily record and reproduce the magnetic signal of the magnetic recording medium.

[0041]

As described in detail above, according to the magnetic head device according to the present invention, the magnetic field generated from each magnetic head can be canceled by the coil, so that the plurality of magnetic heads are mutually magnetically driven. The recording and reproduction can be performed without being interfered with. Thereby, in the magnetic head device according to the present invention, the magnetic field generated from the predetermined magnetic head is shielded, and the magnetic heads disposed around the magnetic head are magnetically stable. Therefore, in this magnetic head device, since a plurality of magnetic heads can operate stably, recording and / or reproduction of a magnetic recording medium can be performed favorably.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of a magnetic head device according to the present invention.

FIG. 2 is a sectional view of a main part of a first magnetic head in the magnetic head device.

FIG. 3 is a sectional view of a main part of a second magnetic head in the magnetic head device.

FIG. 4 is a plan view of a coil in the magnetic head device.

FIG. 5 is a plan view of a main part of a medium sliding surface of the magnetic head device.

FIG. 6 is a perspective view of a main part of another magnetic head device according to the present invention.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 first magnetic head, 2 second magnetic head, 4 magnetic recording medium, 5, 9 recording magnetic head, 6, 10 reproducing magnetic head, 7, 11 coil

Claims (2)

[Claims] 1. A plurality of magnetic heads having at least a reproducing magnetic head and a recording magnetic head and arranged in a running direction of a magnetic recording medium, and at least a portion between the reproducing magnetic head and the recording magnetic head. And a coil formed in the magnetic head device. 2. The magnetic head according to claim 1, wherein the plurality of magnetic heads are a combination of a recording magnetic head having a recording coil therein and a reproducing magnetic head having a magnetoresistive element therein. 2. The magnetic head device according to claim 1, wherein the first is ahead of the magnetic recording medium.