JPH07296326A - Multichannel-type magnetic head device - Google Patents

Abstract

PURPOSE:To improve the crosstalk characteristics between channels and the external induction characteristics and reduce the number of components and the working man-hours. CONSTITUTION:Recording magnetic head chips and reproducing magnetic head chips are vertically and horizontally arranged into a matrix and buried in guard members respectively. A magnetic head unit 7 like this is attached to a shield holder 25 having shield plates 26, 27 and 28 in one-piece to separate the respective magnetic head chips from each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-channel magnetic head device used in, for example, a hard disk drive or a large computer.

[0002]

2. Description of the Related Art For example, as a magnetic head device used in a hard disk drive or a large computer, as shown in FIGS. 7 to 10, since it is necessary to write more data, a plurality of magnetic head chips are required. In general, a multi-channel head configuration is used in which

As shown in FIG. 10, this magnetic head device mainly comprises two recording magnetic head chips 101 and 102 having a recording gap g ₁ and four reproducing magnetic head chips having a reproducing gap g _2. 103, 104,
The magnetic head unit 107 includes the magnetic head unit 107 and the holder 108 that holds the magnetic head unit 107.

In the magnetic head portion 107, three rectangular guard members 111, 112 and 113 are bonded and fixed with shield plates 109 and 110 formed by laminating amorphous materials interposed therebetween, and the respective guard members 111 and 112 are fixed. , 113
The recording magnetic head chips 101 and 102 and the reproducing magnetic head chips 103 to 106 are embedded.

In the middle guard member 112, as shown in FIG. 7, a pair of recording magnetic head chips are formed so that the recording gap g ₁ faces the medium sliding surface 114 and only the front portion thereof is embedded. 101 and 102 are provided with a predetermined track-to-track distance. And
The guard members 111, 113 provided on both sides of the
A pair of reproducing magnetic head chips 103, 105 and 104, 1 are arranged so that the reproducing gap g ₂ faces the medium sliding surface 114 and only the front portion thereof is embedded.
06 is similarly embedded.

These recording magnetic head chips 101, 1
02 and the reproducing magnetic head chips 103 to 106, as shown in FIGS. 8 and 9, a pair of front cores each having a substantially L-shaped cross section are gap-joined, and a leg portion of the front core has a rod-shaped back. A magnetic core is magnetically joined to form a closed magnetic circuit, and a coil bobbin 115 having a drive coil wound around it is attached to the back core to form a magnetic circuit section.

Further, each guard member 111, 112, 11
As shown in FIG. 7 and FIG. 9, the third magnetic head chip 103 is composed of reproducing magnetic head chips 103 and 104 which are provided in a horizontal row across one recording magnetic head chip 101.
Track and the reproducing magnetic head chip 1 provided on both sides of the other recording magnetic head chip 102.
In order to prevent crosstalk between the second tracks constituted by 05 and 106, shield members 116 and 11 are provided between the first and second tracks, respectively.
7,118 are provided.

That is, each guard member 111, 112, 1
13, a pair of head chips 101, 102, 103, 10 provided with a predetermined track-to-track distance.
Shield members 116, 117, 118 each having a rectangular shape are provided between 5, 104, 106. These shield members 116, 117, 118 are all guard members 111, 11 on the side opposite to the medium sliding surface 114.
It is fixed to a groove formed on the back surface of 2, 113 with an adhesive or the like.

Therefore, each of these shield members 109
Through 118, the magnetic head chips 101 to 106 are independently partitioned, and the problem of crosstalk from adjacent chips is solved.

On the other hand, as shown in FIG. 10, the holder 108 is formed of a nonmagnetic permalloy as a quadrangular frame body, and the magnetic head chips 101 to 106 and the shield members 109 to 118 are formed in the voids. Is designed to be stored. Grooves 119 and 120 are provided in the longitudinal direction of the holder 108 so that both end edge portions of the shield members 109 and 110 provided between the three guard members 111, 112 and 113 are fitted.

The magnetic head portion 107 configured as described above
The holder 108 and the holder 108 are fixed by an adhesive. In this magnetic head device, since the holder 108 and the shield members 109 to 118 are separated, conductive paint is applied for grounding.

[0012]

By the way, in the magnetic head device of this type, the recording magnetic head chip 10 is used.
1, 102 to reproducing magnetic head chips 103 to 106
There is a problem of drive error due to the jumping of the recording magnetic field into the disk and the jumping of noise from the motor or power supply. Therefore, in this magnetic head device, each magnetic head chip 1
It is necessary to use a plurality of shield members 109 to 118 so as to partition 01 to 106 independently.

However, in order to attach the plurality of shield members 109 to 118 to the guard members 111 to 113, groove processing, bonding work, etc. are performed.
It is necessary to carry out according to the number of 8, and the mounting work is very troublesome. In addition, since the number of parts is large, it is inevitable that part cost and man-hour increase will occur. This becomes remarkable as the number of channels increases.

Furthermore, the conductive paint applied for grounding is liable to peel off, which causes variations in crosstalk characteristics and external induction characteristics. Also, holder 1
Since 08 is non-magnetic, there is a problem that it is vulnerable to noise from the side surface of the head.

Therefore, the present invention has been proposed in view of the above-mentioned conventional technical problems, and improves crosstalk characteristics between channels and external induction characteristics, and reduces the number of parts and man-hours. It is an object of the present invention to provide a multi-channel magnetic head device capable of achieving the above.

[0016]

In order to solve the above-mentioned problems, a multi-channel type magnetic head device according to the present invention comprises:
A recording magnetic head chip including a coil bobbin wound with a drive coil and having a recording gap, and a reproducing magnetic head chip including a coil bobbin wound with a drive coil and having a reproducing gap, and these recordings. The magnetic head chip for reproduction and the magnetic head chip for reproduction are arranged at predetermined intervals in several rows and columns, and support only the front part where the gap between the recording magnetic head chip and the reproduction magnetic head chip is provided. A guard holder for holding the magnetic head chip, and a shield holder for holding the guard member holding the magnetic head chip and partitioning the magnetic head chips so that they are independent of each other. To do.

In this magnetic head device, the shield plate is integrally formed with the shield holder by pressing or injection molding, and the shield plate and the shield holder are Mn-Zn ferrite which is a high magnetic permeability material. Formed by.

[0018]

In the present invention, the shield plate provided for the purpose of preventing crosstalk between the magnetic head chips,
Since the shield holder is integrally formed of Mn-Zn ferrite made of a high magnetic permeability material by pressing or injection molding, crosstalk characteristics between channels and external induction characteristics are improved. Further, the number of parts can be reduced and the number of molds for manufacturing the parts can be reduced, so that an inexpensive magnetic head device can be provided.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments to which the present invention is applied will be described in detail below with reference to the drawings. In this example,
This is an example of a multi-channel type magnetic head device that requires a large amount of recorded information and is used in a hard disk, a large computer, or the like.

This magnetic head device, as shown in FIGS. 1 to 3, mainly comprises two recording magnetic head chips 1 and 2 having a recording gap g ₁ and four reproducing magnetic head chips having a reproducing gap g ₂ . It is composed of a magnetic head portion 7 having the magnetic head chips 3, 4, 5, 6 and a shield holder 25 for holding the magnetic head portion 7.

Only one of the magnetic head chips 1 and 2 for recording is shown in FIG. 2, but a pair of L-shaped front cores 9 and 10 which are butted against each other via a gap film, and the front cores 9 and 10. It is composed of a rod-shaped back core 11 that is in contact with 10 and forms a closed magnetic circuit, and a coil bobbin 13 around which a drive coil 12 is wound.

The recording magnetic head chip 1,
2 is a pair of gap-bonded front cores 9 and 10
The back core 11 is joined to the leg portion on the back side of the back core 11 by epoxy resin or the like to form a closed magnetic circuit.
A coil bobbin 13 is attached to 1 to form a magnetic circuit section.

Similarly, reproducing magnetic head chips 3, 4,
5 and 6 also have front cores 14 and 15 and back core 16
And a coil bobbin 18 around which the drive coil 17 is wound, and these constitute a magnetic circuit section.

These recording magnetic head chips 1,
Since 2 and the reproducing magnetic head chips 3, 4, 5, 6 are used for data recording, a magnetic metal film such as sendust having a high saturation magnetic flux density and excellent soft magnetic characteristics is arranged in the gap portion. It is said to be a so-called metal-in-gap type magnetic head.

The recording magnetic head chips 1 and 2 and the reproducing magnetic head chips 3, 4, 5 and 6 are provided on a guard member 19 having a rectangular shape in a plane, and the recording gaps g ₁ or 3 are arranged in three rows vertically and two rows horizontally. The reproduction gap g ₂ is held so as to be arranged so as to embed only the front portion thereof.

That is, recording magnetic head chips 1 and 2
Two reproducing magnetic head chips 3, 4, 5, 6 are arranged on the same track on both sides of the magnetic recording medium in a direction orthogonal to the track width direction (medium traveling direction indicated by arrow X in FIG. 1) with a predetermined distance. ing. That is, the reproducing magnetic head chips 3 and 4 are arranged on both sides of the recording magnetic head chip 1 on both sides of the recording magnetic head chip 1 to form a first track, and the reproducing magnetic head chips 3 and 4 are arranged on the same track. The reproducing magnetic head chip 5 is sandwiched between the magnetic head chip 2 and both sides thereof.
And 6 are arranged on the same track at a predetermined distance to form a second track. In other words, the reproduction gap g ₂ , the recording gap g ₁ , and the reproduction gap g ₂ are arranged inline on the first and second tracks, respectively.

On the other hand, these recording magnetic head chips 1,
The guard member 19 for holding the magnetic head chips 3, 4, 5 and 6 for reproduction and the magnetic head chips 1 to 6 for reproduction has a function of holding the magnetic head chips 1 to 6 as well as the gap portions of the magnetic head chips 1 to 6 from the outside. Plays a role in preventing the magnetic field from entering. Therefore, the guard member 19 is made of Mn-Zn ferrite or the like having a high magnetic permeability.

The guard member 19 has a groove portion (not shown) for embedding the magnetic head chips 1 to 6 in one principal surface 19a forming a cuboid shown in FIG. 4, and the magnetic head chips 1 to 1 are provided in the groove portions. Embed only the front part of 6,
The back surface 19b opposite to the one main surface 19a is formed by a sliding surface process for ensuring a contact property with the magnetic tape.

That is, as shown in FIGS. 1 and 2, the medium sliding surface 20 that is in sliding contact with the magnetic tape has the reproducing magnetic head chips 3 and 5 and the recording magnetic head chips 1 and 2 arranged in three columns. In order to leave only the portions near the gaps of the reproducing magnetic head chips 4 and 6 as trapezoidal protrusions in the track width direction, grooves 21 each having a substantially U-shaped cross section in the track width direction are formed on the back surface 19b of the guard member 19. 22, 2
3 and 24 are formed.

Further, one main surface 19a of the guard member 19
The shield plate fitting grooves 29, 30, 31 into which the shield plates 26, 27, 28, which are integrated with the holder 25 described later, are respectively fitted, are formed in the. These shield plate fitting grooves 29, 30, 31 are formed at least as deep as or deeper than the gap portion when the magnetic head chips 1 to 6 are embedded in the guard member 19. Therefore, the shield plates 26, ₂ are provided on the medium sliding surface 20 which is represented by the recording gap g ₁ and the reproducing gap g 2.
7,28 will be exposed.

As shown in FIG. 4, the shield holder 25 is composed of a frame body which is in contact with the outer peripheral edge portion of the magnetic head portion 7 and holds the magnetic head portion 7. That is, the shield holder 25 is formed as a square frame having a size large enough to support the magnetic head portion 7, and the outer peripheral edge portion of the magnetic head portion 7 is placed on the upper end surface 25a of the frame portion. Has been done.

Then, in this shield holder 25,
Shield plates 26, 27, 28 for partitioning the magnetic head chips 1 to 6 of the magnetic head unit 7 independently of each other are provided. These shield plates 26, 27, 28
Is the recording magnetic head chip 1 and the reproducing magnetic head chips 3 and 4 that form the first track and the recording magnetic head chip 2 and the reproducing that form the second track, which are arranged in two horizontal rows of the magnetic head unit 7. Between the recording magnetic head chips 5 and 6 and the recording magnetic head chips 1 and 2 and the reproducing magnetic head chips 3 and 5 arranged in three columns, and between the recording magnetic head chips 1 and 2 and the reproducing magnetic head chips 3 and 5. It is provided between the magnetic head chips 4 and 6, respectively.

These shield plates 26, 27, 28 are provided inside the shield holder 25, which is formed as a frame, as partition walls taller than the shield holder 25. In addition, these shield plates 26, 27, 28
Is formed integrally with the shield holder 25 by pressing or injection-molding Mn-Zn ferrite, which is a high magnetic permeability material.

The shield holder 2 formed in this way
5 and the magnetic head unit 7 are connected to the shield plates 26, 27, 2
8 are inserted into the shield plate fitting grooves 29, 30, and 31, respectively, and are fixed by adhering. The magnetic head unit 7 and the shield plates 26, 27, 28 are
It is fixed to a shield holder pedestal 32 made of non-magnetic nickel silver provided to secure these strengths.

This shield holder cradle 32 is shown in FIG.
As shown in FIG. 5, the frame is formed as a square-shaped frame having a size sufficient to support the shield holder 25 and slightly thicker than the shield holder 25. A positioning member 33 for positioning the magnetic head portion 7 and the shield holder 25 with respect to the shield holder pedestal 32 is provided at one side edge portion of the upper end surface 32a forming the framework of the shield holder pedestal 32. It is formed as a body-shaped protrusion.

In the magnetic head device constructed as described above, the first tape and the second track simultaneously record or reproduce on the magnetic tape running in the direction indicated by the arrow X in FIG. When the forward operation is completed and the reverse operation is performed, the head itself moves in the track width direction indicated by the arrow Y in the figure to record or reproduce on the next track portion. By repeating this several times, a plurality of tracks are formed on the magnetic tape.

In the magnetic head device thus constructed, the magnetic head chips 1 to 6 are partitioned by the shield plates 26, 27 and 28 so as to be independent in the shield holder 25 made of a high magnetic permeability material. Therefore, the magnetic fields generated from the magnetic head chips 1 to 6 can be surely blocked from entering the other magnetic head chips 1 to 6. Therefore, crosstalk characteristics between channels and external induction characteristics are improved. Moreover, by lowering the shield holder 25 as the shield holder pedestal 32 hairs, it is possible to reduce the leakage of the magnetic field to the adjacent channel.

Furthermore, since Mn-Zn ferrite made of a high magnetic permeability material is used for the sliding surface of the medium, noise from the outside is received by the shield holder 25, and is further grounded to the shield holder pedestal 32 as ground. As a result, the influence on the magnetic head chips 1 to 6 can be reduced.

Further, since the shield plates 26, 27, 28 are integrated with the shield holder 25, the number of parts and the number of molds can be reduced, and the shield plates 26, 26 It is possible to avoid troublesome attachment work of the shield holders 27 and 28 to the shield holder 25.

In the magnetic head device described above, the shield holder pedestal 32 is provided in order to secure the strength of the shield holder 25. However, if the mechanical strength of the shield holder 25 itself is increased, the shield holder reception is not necessarily required. The base 32 is not needed. For example, as shown in FIG. 5, the mechanical strength of the shield holder 25 itself is increased by setting the height of the frame of the shield holder 25 to a length that does not require the shield holder pedestal 32.

Besides this, as shown in FIG. 6, the shield plate 2
The shield plates 26, 27, 28 and the shield holder 25 may be integrally formed by setting the heights of the shield holders 25, 26, and 28 at the same height. In this case, the shield plates 26, 27, 28 cannot be fitted into the shield plate fitting groove provided in the guard member 19, so the magnetic head portion 7 has the structure shown in FIG.

That is, the magnetic head portion 7 has shield plates 37 and 3 each formed by laminating an amorphous alloy or the like between three rectangular guard members 34, 35 and 36, respectively.
8 through which the guard members 34, 3 are integrally joined.
The recording magnetic head chips 1 and 2 and the reproducing magnetic head chips 3, 4, 5 and 6 are attached to 5 and 36 so that only the front portions thereof are embedded.

The magnetic head portion 7 constructed in this way
Are housed in the respective magnetic head chip housings partitioned by the shield plates 26, 27, and 28, and fixed to the shield holder 25 by adhesion. Then, the magnetic head unit 7 and the shield holder 25 that are adhesively fixed are adhesively fixed to the shield holder pedestal 32 to complete the magnetic head device.

Like the above magnetic head device, this magnetic head device can improve the crosstalk characteristic between channels and the external induction characteristic, can reduce the leakage of the magnetic field to the adjacent channel, and can reduce the number of parts. The cost can be reduced.

[0045]

As is apparent from the above description, in the multi-channel type magnetic head device of the present invention, each magnetic head chip is made independent in the shield holder made of the high magnetic permeability material. Since it is partitioned by a shield plate made of a high-permeability material, it is possible to reliably block the entry of magnetic fields generated by each magnetic head chip into other magnetic head chips, crosstalk characteristics between channels and external induction characteristics. Can be further improved. Further, by lowering the shield holder as the shield holder pedestal hair, it is possible to reduce the leakage of the magnetic field to the adjacent channel.

Further, in the multi-channel type magnetic head device of the present invention, since each shield plate is integrated with the shield holder, the number of parts and the number of molds can be reduced, and the conventional method has been adopted. A troublesome work of attaching the shield plate to the shield holder is unnecessary, and an inexpensive magnetic head device can be provided.

[Brief description of drawings]

FIG. 1 is a plan view of a multi-channel type magnetic head device to which the present invention is applied.

FIG. 2 is a partially cutaway front view showing a multi-channel magnetic head device to which the present invention is applied.

FIG. 3 is a vertical sectional view of a multi-channel type magnetic head device to which the present invention is applied.

FIG. 4 is an exploded perspective view of a multi-channel type magnetic head device to which the present invention is applied.

FIG. 5 is an exploded perspective view showing another example of a multi-channel type magnetic head device to which the present invention is applied.

FIG. 6 is an exploded perspective view showing still another example of the multi-channel type magnetic head device to which the present invention is applied.

FIG. 7 is a plan view of a conventional multi-channel magnetic head device.

FIG. 8 is a partially cutaway front view showing a conventional multi-channel magnetic head device.

FIG. 9 is a vertical cross-sectional view of a conventional multi-channel magnetic head device.

FIG. 10 is an exploded perspective view of a conventional multi-channel magnetic head device.

[Explanation of symbols]

 1, 2 magnetic head chip for recording 3, 4, 5, 6 magnetic head chip for reproduction 7 magnetic head part 9, 10, 14, 15 front core 11, 16 back core 12, 17 drive coil 13, 18 coil bobbin 19 guard member 20 medium sliding surface 25 shield holder 26, 27, 28 shield plate

Claims (3)

[Claims] 1. A recording magnetic head chip including a coil bobbin wound with a drive coil and having a recording gap, and a reproducing magnetic head including a coil bobbin wound with a drive coil and having a reproducing gap. A chip, and the magnetic head chip for recording and the magnetic head chip for reproducing are arranged at a predetermined interval in several rows and columns in the vertical and horizontal directions, and a front gap is provided between the magnetic head chip for recording and the magnetic head chip for reproducing. A guard member that supports and holds only a portion, and a shield holder that supports the guard member that holds the magnetic head chip and that integrates a shield plate that partitions each of the magnetic head chips independently Multi-channel type magnetic head device. 2. The multi-channel magnetic head device according to claim 1, wherein the shield plate is formed integrally with the shield holder by pressing or injection molding. 3. The shield plate and the shield holder are both M
It consists of n-Zn ferrite, It is characterized by the above-mentioned.
The multi-channel magnetic head device described.