JPH0773410A - Magnetic head device - Google Patents

Abstract

PURPOSE:To suppress the cross feed even at the time of reducing the space between magnetic gaps by forming a magnetic path separating groove, which faces a magnetic recording medium slide surface, in a magnetic core between magnetic gaps. CONSTITUTION:A recording gap g1 is provided in the center, and reproducing gaps g2 and g3 are provided on both sides of this gap g1 in the magnetic tape running direction. With respect to a recording magnetic head element 31 constituting the recording magnetic gap g1, a pair of magnetic cores 31a and 31b are unitedly joined with a gap material between them, and a back core 31c is joined to the back side to constitute a close magnetic path, and a coil bobbin 32 around which a coil is wound is inserted to this core 31c, and a current is supplied to the coil to generate a recording magnetic field in the close magnetic path consisting of magnetic cores 31a, 31b, and 31c. Since magnetic path separating grooves 41 and 42 which face the magnetic recording medium slide surface and have the approximately V-shaped section are formed between the recording gap g1 and reproducing gaps g2 and g3, the space between adjacent magnetic cores 31a and 31b is apparently widened, and signal leakage between magnetic cores is suppressed even at the time of reducing the space between magnetic gaps to suppress the cross feed.

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, such as a magnetic head device for a data cartridge, in which a plurality of magnetic gaps (for example, a recording gap and a reproducing gap) are arranged in a sliding direction of a magnetic recording medium. It is about.

[0002]

2. Description of the Related Art For example, in various computers and the like, a hard disk, a flexible disk or the like is generally used as an information storage medium, but a data cartridge is also used for the purpose of further increasing the storage capacity. .

The data cartridge is designed to read and write an information signal in a short time by running a magnetic tape contained in a cassette at a high speed. When recording and reproducing the information signal, the recording head and the reproducing head are separated from each other. It is common to use a multi-channel type magnetic head device in which a plurality of magnetic heads are arranged.

FIG. 14 shows a conventional multi-channel type magnetic head device, in which a recording head 101 and a reproducing head 102 each having a pair of magnetic cores butted against each other.
And are arranged in the magnetic tape running direction. In this example, two sets of the recording head 101 and the reproducing head 102 are arranged in parallel with their relative positions reversed, corresponding to the running direction of the magnetic tape (rightward and leftward in the drawing). There is.

In the multi-channel type magnetic head device having such a structure, the jumping (leakage) of the signal into the adjacent magnetic core has been a problem as so-called cross-feed, and conventionally, the recording head 101 and the reproducing head are used. Head 1
02 and the recording head 1
01 and the reproducing head 102, a shield plate 103 is inserted.

[0006]

In the data cartridge, it is advantageous to make the distance between the recording head and the reproducing head as small as possible in order to increase the storage capacity. However, in the magnetic head device having the above-described structure, if the distance between the recording head and the reproducing head is simply reduced, the volume of the magnetic core must be reduced, which is disadvantageous in terms of recording efficiency and reproducing efficiency. is there.
It also becomes difficult to insert a shield plate.

Therefore, the present invention has been proposed in view of such a conventional situation, and it is possible to reduce the distance between the recording gap and the reproducing gap and to suppress the cross feed. An object is to provide a magnetic head device.

[0008]

In order to achieve the above object, the present invention provides a magnetic head device in which a plurality of magnetic gaps are arranged in a sliding direction of a magnetic recording medium, and a magnetic core between the magnetic gaps. In addition, a magnetic path separation groove is formed facing the sliding surface of the magnetic recording medium.

The present invention is also suitable for application to a magnetic head device in which the gap between the recording gap and the reproducing gap is reduced by obliquely abutting the magnetic cores so that the gap forming surface becomes an inclined surface. According to a second invention of the present application, center cores are arranged on both side surfaces of the first magnetic head element having the first magnetic gap, and the magnetic cores forming closed magnetic paths are respectively interposed by the center core and the gap material. A magnetic head device in which the first and the third magnetic gaps are arranged in the sliding direction of the magnetic recording medium. The gap forming surfaces of the magnetic cores forming the gaps are inclined surfaces, and the gap forming surfaces forming each magnetic gap are not parallel to each other in the depth direction. Is characterized in that the magnetic core between the magnetic gap to form a magnetic path isolation trench to face the magnetic recording medium sliding surface.

In each of the above magnetic head devices, the magnetic path separating groove provided on the sliding surface of the magnetic recording medium may be left as a space without being filled with anything, but if it is filled with a shield member, the cross field is further suppressed. As a result, the contact state with respect to the magnetic recording medium becomes good. This is the third part of this application
That is, the third invention of the present application is characterized in that a shield member is arranged in the magnetic path separation groove.

[0011]

When the gap between the recording gap and the reproducing gap is reduced, a magnetic path separation groove (for example, a groove having a V-shaped cross section) facing the sliding surface of the magnetic recording medium in the magnetic core between these gaps.
By providing, the signal jump (leakage) between the adjacent magnetic cores is suppressed, and the cross feed is suppressed.

If a shield member is provided in the magnetic path separation groove, the cross field can be further suppressed and the contact state with respect to the magnetic recording medium can be improved.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific embodiment in which the present invention is applied to a magnetic head device for a data cartridge will be described in detail with reference to the drawings.

The magnetic head device of this embodiment is shown in FIGS.
As shown in 2, the recording gap g ₁In the center,
Recording gap g₁Magnetic tape running direction on both sides across
Playback gap g₂, G₃Are arranged.

The recording magnetic head element 31 constituting the recording gap g ₁ is a pair of magnetic cores 31a and 31b joined and integrated via a gap material. A back core 31c is joined to the back side to form a closed magnetic circuit. And a coil bobbin 32 in which a coil is wound is inserted in the back core 31c. Therefore, by supplying a current to the coil, the magnetic cores 31a, 31b, 31
A recording magnetic field is generated in the closed magnetic circuit formed by c.

Both side surfaces of the recording magnetic head element 31,
That is, the outer surfaces of the pair of magnetic cores 31a and 31b are inclined surfaces, and the reproduction gaps g ₂ and g are formed along the inclined surfaces.
The center cores 33a and 34a of the reproducing magnetic head elements 33 and 34 constituting the element ₃ are obliquely glass-fused by the fused glasses 35 and 36.

The center cores 33a and 34a are also provided.
The side cores 33b and 34b, which are substantially L-shaped, are gap-bonded by the fused glasses 37 and 38, respectively, and the gap forming surfaces of the reproducing gaps g ₂ and g ₃ are inclined surfaces. It is not parallel to the gap forming surface of the recording gap g ₁ in the depth direction.

The reproducing magnetic head elements 33 and 34 are used.
Also in the above, as in the case of the recording magnetic head element 31, the back cores 33c, 34c are joined to the back side to form a closed magnetic circuit, and the back cores 33c, 3
Coil bobbins 39 and 4 each having a coil wound around 4c
0 is inserted so that a reproduction signal by electromagnetic conversion is taken out.

The schematic structure of the magnetic head device of this embodiment is as described above. The structure of the magnetic head device will be described in more detail by explaining the manufacturing method.

To manufacture the above magnetic head device, first, a reproducing magnetic head block is formed. The reproducing magnetic head block is composed of a reproducing magnetic core block and a center core block. First, a block made of a magnetic material is obliquely cut at a desired angle to obtain a reproducing magnetic core block. Then, the inclined surface of the reproducing magnetic core block is subjected to chamfering processing, and as shown in FIG. 3, one of the reproducing magnetic core block 1 and the one for performing glass fusion of the reproducing magnetic core block 1 and the center core block is performed. A groove-shaped glass groove 2 having an inclined portion is formed.

At this time, since the depth (depth) of the reproducing magnetic gap is regulated by the glass groove 2, the tip 2a of the inclined portion of the glass groove 2 has a depth of 0 for the reproducing magnetic core block 1. The glass groove 2 is formed so as to correspond to the position. Then, a gap material such as SiO ₂ is formed on the gap forming surface 1a of the reproducing magnetic core block 1 by vacuum thin film forming means such as sputtering.

Next, the center core block is chamfered. Grinding portions 3a and 3b indicated by broken lines on both shoulders of the prismatic block 3 made of a magnetic material as shown in FIG. At this time, the inclinations of the grinding portions 3a and 3b are set so as to match the inclination of the reproducing magnetic core block 1. As with the reproducing magnetic core block 1, a gap material made of, for example, SiO ₂ is formed on the inclined surface of the center core block 3 by vacuum thin film forming means such as sputtering.

Then, the reproducing magnetic core block 1, the center core block 3, and the reproducing magnetic core block 4 formed similarly to the reproducing magnetic core block 1 are joined. That is, as shown in FIG. 5, the reproducing magnetic core block 1 and the reproducing magnetic core block 4 are sandwiched and supported so that the inclined surfaces of the reproducing magnetic core block 4 and the center core block 3 are in contact with each other,
The fused glass 6 is placed in the glass grooves 2 and 5 of each of the reproducing magnetic core blocks 1 and 4 and subjected to pressure heating treatment. At this time, the tip portions 2 of the glass grooves 2 and 5 of the reproducing magnetic core blocks 1 and 4
Bonding is performed so that the heights of a and 5a are the same, that is, the positions of the depth 0 are the same. Thus, the reproducing magnetic head block 7 having the _two reproducing magnetic gaps g ₂ and g ₃ as shown in FIG. 6 is obtained.

Next, a recording magnetic head block fitting groove described later is formed in the reproducing magnetic head block. That is, as shown in FIG. 7, the reproducing magnetic core blocks 1, 4
The center core block 3 of the reproducing magnetic head block 7 including the center core block 3 and the center core block 3 has a shape having a V-shaped cross section and a rectangular fitting portion at the bottom, that is, the inclined portion 9 and both ends of the tip portion. The fitting groove 8 including the rectangular fitting portion 10 having the groove portions 11 and 12 is formed.

Here, when the recording magnetic head block described later is fitted in the fitting groove 8, the depth of the recording magnetic head block is determined by the fitted position. Therefore, the fitting groove 8 is formed by the inclined portion 9 and the rectangular fitting portion 10,
The bottom surface of the fitting portion 10 of the fitting groove 8 has the abutting surface 10a, so that the depth of the recording magnetic head block is aligned more reliably.
Further, by providing the groove portions 11 and 12 on both sides of the tip of the fitting portion 10 and performing so-called relief processing, the recording magnetic head block is fitted more reliably. The dimensions such as the depth of the fitting groove 8 are set within a range in which the depth of the recording magnetic head block and the reproducing magnetic head block 7 can be matched.

Next, the recording magnetic head block is formed. First, as shown in FIG. 8, a block 13 made of a magnetic material forming one magnetic core block is joined to a glass groove 14 for fusion bonding with another magnetic core block.
To form. The glass groove 14 is a groove portion of which one side is an inclined surface, and this restricts the depth (depth) of the recording magnetic gap. Therefore, the rectangular portion 14 a is formed at the tip of the inclined portion of the glass groove 14. Is provided, and the rectangular portion 14
The glass groove 14 is formed so that the tip portion of a corresponds to a position where the depth becomes zero. Then, a gap material such as SiO ₂ is formed on the gap forming surface 13a of the block 13 by vacuum thin film forming means such as sputtering.

Next, a glass groove is also formed in the block forming the other magnetic core block. At this time, the depth of the abutting surface of the magnetic core block is made larger than the depth of the magnetic core block. A glass groove is formed in. The reason is that by making the abutting surface of one magnetic core block larger than the gap forming surface of the other magnetic core block, even if some deviation occurs, it is determined by the magnetic gap forming surface of the latter magnetic core block. This is because a predetermined depth can be formed. The gap material is also formed on the gap forming surface of the magnetic core block.

Then, as shown in FIG. 9, the block 13 obtained as described above is brought into contact with the block 16 obtained in the same manner, and the fused glass 18 is placed in the glass grooves 14 and 17. , Heating and pressurizing treatment and joining,
A recording magnetic head block 19 as shown in FIG. Next, as shown in FIG. 10, the recording magnetic head block 19
Shoulder shoulder processing is performed on. That is, the grinding parts 13a and 16a indicated by broken lines in FIG. To be fitted into the fitting groove 8 so as to be fitted to the recording magnetic head block 19 and the reproducing magnetic head block 7 so that the depth can be adjusted. is there.

The recording magnetic head block 19 after the grinding portions 13a and 16a have been ground has a corresponding inclination with a slight gap in the inclined portion 9 of the fitting groove 8 of the reproducing magnetic head block 7. It is composed of a portion 19b and a rectangular protrusion 19c that fits into the fitting portion 10 of the fitting groove 8. At this time, the distance from the abutting surface 10a of the fitting portion 10 of the fitting groove 8 of the reproducing magnetic head block 7 to the position of the depth 0 of the reproducing magnetic head block 7 and the recording magnetic head block 1
By adjusting the distance from the tip of the protruding portion 19c of 9 to the position of the depth 0 of the recording magnetic head block 19, the depth of the reproducing magnetic head block 7 and the recording magnetic head block 19 can be easily adjusted. .

Then, the reproducing magnetic head block and the recording magnetic head block are joined. That is, FIG.
As shown in FIG. 1, the recording magnetic head block 1 is inserted into the fitting groove 8 of the center core block 3 of the reproducing magnetic head block 7.
9 is fitted, the fused glass 20 is placed in the gap between the reproducing magnetic head block 7 and the recording magnetic head block 19, and the magnetic head block 21 is obtained by performing heat and pressure treatment and bonding.

At this time, as described above, the distance from the abutting surface 10a of the fitting groove 8 of the reproducing magnetic head block 7 to the position of the depth 0 of the reproducing magnetic head block 7 and the recording magnetic head block 19. Since the distance from the tip of the protruding portion 19c to the position of the depth 0 of the recording magnetic head block 19 is adjusted, the tip portions 2a and 5a of the glass grooves 2 and 5 of the reproducing magnetic head block 7 and the recording magnetic head block 7 are recorded. Since the heights of the tip portions 14a of the glass grooves 14 of the head block 19 are the same, the depths of the reproducing magnetic head block 7 and the recording magnetic head block 19 can be adjusted easily and accurately.

The magnetic head block thus obtained is ground on the medium sliding surface and the back side under predetermined conditions, and chips are cut to obtain a magnetic head. That is, FIG.
2, the magnetic head block 21 has g ₁ , g ₂ ,
Grinding is performed on the grinding surface D so that a desired depth can be formed on g ₃ . At this time, the protruding portion of the recording magnetic head block 19 and the fitting portion 10 of the fitting groove 8 of the reproducing magnetic head block 7 are scraped off by grinding.

The above is the configuration of the magnetic head device of the present embodiment. As described above, in this magnetic head device, the gap forming surfaces of the reproducing gaps g ₂ and g ₃ are inclined surfaces. Since it is not parallel to the gap forming surface of the recording gap g ₁ in the depth direction, the distance between the reproducing gaps g ₂ and g ₃ and the recording gap g ₁ can be reduced. It is difficult to arrange a shield plate necessary for improving cross feed in terms of space.

Therefore, in this embodiment, as shown in FIG. 2, a magnetic recording medium is provided between the recording gap g ₁ and the reproducing gap g ₂ and between the recording gap g ₁ and the reproducing gap g _3. Magnetic path separation grooves 41, 42 having a substantially V-shaped cross section facing the sliding surface are formed. That is, the magnetic core 31 a of the recording magnetic head element 31 and the reproducing magnetic head element 3
The boundary portion of the center core 33a of No. 3 and the boundary portion of the magnetic core 31b of the recording magnetic head element 31 and the center core 34a of the reproducing magnetic head element 34 are cut into a V-shaped cross section, 42 is formed.

By inserting the magnetic path separating grooves 41 and 42 into the sliding surface of the magnetic recording medium, the adjacent magnetic cores (that is, the magnetic core 31a, the center core 33a, and the magnetic core 31) are formed.
The distance between b and the center core 34a) is apparently wide,
It is improved to the extent that cross feed is not a problem. In fact, when the gap between the recording gap g ₁ and the reproducing gaps g ₂ and g ₃ is 1.5 mm, the magnetic path separation groove 41,
By setting the groove width of 42 to 0.8 mm, the cross feed was at a level at which there was no practical problem.

The cross-sectional shape of the magnetic path separation grooves 41, 42 is arbitrary, but in order to make the volume of each magnetic core as large as possible and to secure the space between the adjacent magnetic cores, a substantially V-shaped cross section is provided. It is preferable to make the shape.

The magnetic path separating grooves 41 and 42 may be left as a space without being filled with anything, but as shown in FIG. 13, a shield member processed into a wedge shape (for example, a clad of permalloy and Cu). The material 43, 44 may be embedded. As a result, the eddy current is absorbed by the shield members 43 and 44, and the cross feed is further improved.

The specific embodiment to which the present invention is applied has been described above, but it goes without saying that the present invention is not limited to this embodiment. For example, in the magnetic head device of the above-described embodiment, the reproducing gap, the recording gap, and the reproducing gap are sequentially arranged, but the recording gap, the reproducing gap, and the recording gap may be arranged. Further, it can be applied to a magnetic head device having a structure as shown in FIG.

[0039]

As is apparent from the above description, in the magnetic head device of the present invention, the magnetic path separation groove is formed in the magnetic core between the magnetic gaps so as to face the sliding surface of the magnetic recording medium. Therefore, the spacing between adjacent magnetic cores can be apparently widened, and even when the spacing between the magnetic gaps is reduced, the signal jump (leakage) between the magnetic cores is suppressed,
It is possible to suppress cross feed.

[Brief description of drawings]

FIG. 1 is a schematic plan view of an essential part showing an example of a magnetic head device to which the present invention is applied.

FIG. 2 is a schematic side view showing an example of a magnetic head device to which the present invention is applied partially broken away.

FIG. 3 is a perspective view showing a method of manufacturing a magnetic head device to which the present invention is applied, in the order of steps, and showing a step of forming a glass groove in a reproducing magnetic core block.

FIG. 4 is a perspective view showing a chamfering process of the center core block.

FIG. 5 is a front view showing a process of joining a reproducing magnetic core block and a center core block to form a reproducing magnetic head block.

FIG. 6 is a side view showing the formed reproducing magnetic head block.

FIG. 7 is a side view showing a step of forming a fitting groove of the recording magnetic head block in the reproducing magnetic head block.

FIG. 8 is a perspective view showing a step of forming a glass groove in a block forming a recording magnetic head block.

FIG. 9 is a side view showing a process of joining a pair of blocks to form a recording magnetic head block.

FIG. 10 is a side view showing a step of performing a grinding process on the recording magnetic head block.

FIG. 11 is a side view showing a step of joining the reproducing magnetic head block and the recording magnetic head block.

FIG. 12 is a side view showing a magnetic head block obtained.

FIG. 13 is a schematic side view showing another example of the magnetic head device to which the present invention is applied with a part thereof broken away.

FIG. 14 is a schematic plan view showing an example of a conventional magnetic head device.

[Explanation of symbols]

31 ... Recording magnetic head element 33, 34 ... Reproducing magnetic head element g ₁ ... Recording gap g ₂ , g ₃ ... Reproducing gap 31a, 31b ... Magnetic core 33a, 34a ... Center core 41, 42 ... Magnetic path separation groove 43, 44 ... Shield member

Claims (3)

[Claims] 1. A magnetic head device comprising a plurality of magnetic gaps arranged in a sliding direction of a magnetic recording medium, wherein a magnetic path separation groove is formed in a magnetic core between the magnetic gaps so as to face a sliding surface of the magnetic recording medium. A magnetic head device characterized by the above. 2. A center core is disposed on both side surfaces of a first magnetic head element having a first magnetic gap, and magnetic cores forming a closed magnetic path are joined to the center cores via a gap material. A second and a third magnetic gap, and the first to the third magnetic gaps are arranged in the sliding direction of the magnetic recording medium, wherein the second and the third magnetic gaps are formed. The gap forming surfaces of the magnetic cores are inclined surfaces, the gap forming surfaces forming the magnetic gaps are not parallel to each other in the depth direction, and the magnetic cores between the magnetic gaps face the sliding surface of the magnetic recording medium. 2. The magnetic head device according to claim 1, wherein the magnetic path separation groove is formed by. 3. The magnetic head device according to claim 1, wherein a shield member is arranged in the magnetic path separation groove.