JPS62192020A - Magnetic head - Google Patents

Abstract

PURPOSE:To obtain a magnetic head with a good magnetic characteristic and superior in productivity and in a mass production suitability, by making a crystallized glass from the non-magnetic material of the magnetic head in which a recording and reproducing head part is sandwiched with an erasing head part, and heating and welding the crystallized glass. CONSTITUTION:Erasing head parts 12 and 13 are arranged so as to sandwich a recording and reproducing part 11, and the magnetic gaps g2 and g3 of the head parts 12 and 13 are arranged so as to be positioned at the both sides in the reward of the magnetic gap g1 of the head part 11. The head parts 11-13 are constituted with a compound body in which magnetic core parts 11a, 12a, and 13a, and non-magnetic materials 11b-13b are formed in one body. The crystallized glass is used as the non-magnetic materials 11b-13b, and by heating the glass, the glass in crystal melted out and welded, therefore, by heating and connecting with pressure confronting the core part with the non-magnetic material, the glass in the crystal is melted out and attached on the non-magnetic material, and it is possible to make into a compound in one body by performing a cooling in the above state.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic head used in a magnetic disk device, and more particularly to a so-called tunnel erase type magnetic head in which a recording/reproducing head section is held between an erasing head section. Regarding.

[Summary of the invention]

The present invention provides a tunnel erase type in which a recording/reproducing head section and an erasing head section each made of a composite of a magnetic core section and a non-magnetic material are joined together, and the recording/reproducing head section is integrated so as to be sandwiched between the erasing head section. In this magnetic head, the non-magnetic material of each of the head parts is made of crystallized glass, and by heating and fusing the crystallized glass itself to form a composite, the magnetic core part has good magnetic properties and productivity is improved. It is designed to be excellent in mass production.

[Conventional technology]

For example, magnetic disks such as floppy disks are relatively easy to handle and can record 13 measurements, so their use as external storage devices for minicomputers, office computers, personal computers, etc. is expanding.

The above-mentioned floppy disk records information signals on concentric tracks, and in order to ensure the compatibility of the information signals, the information signals are recorded with a track width slightly narrower than the track pitch of a normal disk. is being carried out. In other words, even if the recording/reproducing head section is off-track (positional deviation) with respect to the recording track, the F1 head built into the magnetic disk drive will not be able to maintain the distance between the information signals recorded on the disk. In order to guarantee the spacing, the erasing section is placed on both sides of the recording/reproducing section.
A so-called tunnel erase type sliding head is used.

As shown in FIG.
) are used to secure the mechanical strength of the head and the contact area with the disk, respectively.
52a), (53a) and non-magnetic material (51b)
, (52b), (53b) and molten glass (5
1c), (52c), and (53c), and these head parts (
Sliders (54) and (55) are arranged to protect the sliders 51), (52), and (53). And the magnetic core parts (51a), (52a),
For (53a), a ferromagnetic oxide + A material such as Mn-Zn ferrite or Ni-Zn ferrite is used, and the above-mentioned non-fl material (51b), (52bl), , (
53h) include ceramics, barium titanate,
High hardness materials such as potassium titanate are used.

In this way, each head part (51), (52),
(53) is a magnetic core part (51a), (52a)
, (53a) and non-magnetic material (51b), (52b
), (53b) and ga? 8 fused glass (51c),
(52c) and (53c) are fused and integrated, and various methods are conventionally known as this fusion method. Specifically, (Δ) A method in which a groove is provided in a part of the bonding surface between the magnetic core part and the non-magnetic material, and molten glass is poured into the groove to perform fusion bonding.

(B) After coating at least one of the joint surfaces of the 611 magnetic core part and the non-magnetic material with a fused glass by sputtering or coating, the magnetic core part and the non-magnetic material are butted together and then heated and fused. How to join.

i8 fused glass (
An example of this method is to use an adhesive (adhesive).

[Problem that the invention seeks to solve]

However, with method (A) above, there are problems with the reliability of this bonding due to the fact that the molten glass tends to form glass bubbles (holes), cracks tend to occur during cooling, etc. . Therefore, in order to eliminate the glass bubbles and cracks, strict process control is required for this bonding process, resulting in a decrease in productivity and yield.

In addition, method (B) requires a complicated manufacturing process and the coating tends to be non-uniform, and there are problems in terms of productivity and yield similar to method (A).

Furthermore, in any of these methods, since there is a large difference in coefficient of thermal expansion between the ferrite that makes up the magnetic core and the ceramic that makes up the non-magnetic material, internal stress is generated in the magnetic core during this fusion process. In some cases, cracks may occur in the magnetic core. This causes deterioration of the mechanical strength or magnetic properties of each head portion. In addition, cracks caused by such a coefficient of thermal expansion are particularly noticeable when a head block is manufactured by joining a long magnetic core block and a non-magnetic block, and this head block is not processed by slicing. Even if a large number of head chips are cut out, the reliability will be poor. Therefore, this poses a big problem in terms of mass productivity and yield.

Therefore, the present invention was proposed in view of the above-mentioned actual situation, and an object of the present invention is to provide a magnetic heme 1 whose magnetic core has good magnetic properties and which has improved productivity and mass production. do.

[Means for solving the problem] In order to achieve this object, the air head of the present invention has the following features:
A magnetic core is formed by joining a recording/reproducing head section and an erasing head section, each of which is made of a composite of a magnetic core section and a non-(I), and an erasing head section, and integrating the recording/reproducing head section with the erasing head section. In the throat, the non-magnetic material of each of the head parts is made of crystallized glass, and a composite is formed by fusion to the crystallized glass itself.

[Effect]

Crystallized glass is non-magnetic and has high mechanical strength, and furthermore, any desired coefficient of thermal expansion can be easily obtained by changing the composition and heating conditions for crystallization. Further, when the above-mentioned crystallized glass is heated, a part of the crystallized glass is eluted, and this (8) glass has a characteristic that it has a fusing action.

Therefore, by simply heat-pressing the crystallized glass to the magnetic core part, f'J ji'L can be compositely integrated, and at the same time,
Since the crystallized glass mentioned above can be made of a material having a thermal expansion coefficient equivalent to that of the magnetic core, there will be no cracks.

(Example) Next, specific examples of the present invention will be described with reference to the drawings.

In the magnetic head of the present invention, as shown in FIG.
A pair of erasing head sections (12) and (13) are disposed to sandwich the recording/reproducing head section (11), and the erasing head section (11) is located behind the magnetic gap g+ of the recording/reproducing head section (11). The magnetic gears of the head portions (12) and (13) are arranged so that the magnetic gears gz1g3 are located.

Therefore, if the disk is run in the X direction in the figure,
l! [A guard band is formed by recording an information signal with a gap g, and erasing both sides of the recorded signal with a magnetic gear knob gz+gz. Therefore, even if the recording/reproducing head section (11) produces an off-track with respect to the recording track of the disk, the interval between the signals recorded on the disk is guaranteed.
Good recording and reproducing characteristics can be obtained. Furthermore, sliders (14) and (15) made of a non-R material such as barium titanate or calcium titanate are integrated so as to sandwich these head parts (11), (12), and (13). , so as to make stable contact with the magnetic disk.

Here, each of the above head parts (l l), (12),
(13) is the magnetic core part (lla), (12a)
, (13a) and non-magnetic material (llb), (12b)
, (13b). In the present invention, the non-magnetic material (1
By using crystallized glass for lb), (12b), and (13b), the magnetic core portions (lla), (1
2a), (13a) and non-magnetic material (1lb),
(12b) and (13b) are joined.

That is, when the crystallized glass is heated, the glass in the crystals is eluted, and this eluted glass has a fusing action. For this reason, the magnetic core part (lla), (1
2a), (13a) and non-magnetic +A' (llb)
, (12b), and (13b) are butted against each other and pressed at a pressure of 215 degrees at some parts, the glass in the crystal is eluted, and this eluted glass becomes the non-magnetic material (llb), (+2b).
, (13b), and by cooling in this state, it can be integrated into a composite. Therefore, the conventional complicated steps of pouring molten glass or coating the bonding surfaces with fused glass are no longer necessary, simplifying the manufacturing process and greatly improving productivity. At the same time, it is possible to eliminate the occurrence of glass particles, etc., so it is possible to manufacture heads with enlightened and true flair with a high yield through gentle process control.

Further, the above-mentioned crystallized glass also has the advantage that a desired coefficient of thermal expansion can be easily obtained by changing its composition and heating conditions (temperature, etc.) for crystallization. For this reason, the magnetic core part (lla),
(12a), a high magnetic permeability material constituting (13a),
For example, Ni-Zn ferrite (thermal expansion coefficient from room temperature to 400°C: aoxto-' ~ 105 X I O-
'deg-') and Mn-Znn Fushii 1- (same: 100
X1 (1-' to 130
2b), (13b) can be easily obtained. Therefore, the magnetic core parts (lla), (12a),
(13a) and non-magnetic M'(Ilb), (12b)
, (131+) can eliminate internal stress and cracks caused by the difference in thermal expansion coefficient, (131+)
It becomes a magnetic head with

As a crystallized glass that has such 1, ¥1 piece,
Those with excellent wear resistance ↓L property and j4'+'X resistance are preferable, such as Lizo, Siot, AI! zo3. N
aHQ.

It is preferable to use an oxide such as CaO as a soil component.
In order to clarify the structure of the magnetic head of the present invention, a method of manufacturing the same will be explained.

First, as shown in Figure 2, M low Zn ferrite and N
1-An elongated magnetic core block (2) made by butting together magnetic cores (21) and (22) made of ferromagnetic metal materials such as Zn ferrite (2) through a gap spacer.
3) and a long non-magnetic block (25) made of crystallized glass, and these blocks (23).

(25) and pressurize them in the Y and Z directions in the figure (
1~5 kg-cmf) 600~ in heating furnace while heating
A head block (27) is produced by heating and fusing at 850° C. and then slowly cooling and fusing and bonding.

Here, in the present invention, since crystallized glass is used as the non-magnetic block (25), each block (23)
, (25) can be easily joined simply by heat-pressing.

Therefore, this joining process can be simplified and productivity can be greatly improved. At the same time, the above crystallized glass has a magnetic core (
Since we use a material with a thermal expansion coefficient equivalent to 22),
Even if the blocks (23) and (25) become longer, no internal stress remains or cracks occur in the magnetic core block (23), and the reliability of this bonding is excellent.

Next, as shown in FIGS. 3 and 4, for each head block (27) formed with a predetermined gap thickness, the non-magnetic block (25) is processed with a rotary whetstone, etc., and grooves (28) are formed. ), forming (29). Here, the third
As shown in the figure, a non-magnetic block (25) formed with a groove (28) so as to have a substantially U-shape to form a so-called E-shaped block is used as a block for a recording/reproducing head. on the other hand,
As shown in FIG. 4, a non-magnetic block (25) is formed with a groove (29) in an oval shape to form a so-called F-type block, which is used as a block for an erase head.

Next, as shown in FIGS. 5 and 6, each of the head blocks is subjected to a slicing process to obtain a predetermined thickness (corresponding to the track width) to obtain a large number of head chips. The E-type head chip shown in FIG. 5 corresponds to the recording/reproducing head section (30), and the F-type head chip shown in FIG. 6 corresponds to the erasing head section (31).

Each head part (30), (3
1) uses crystallized glass as the non-magnetic materials (25a) and (25b), so the non-magnetic materials (25a)
, (25h) and magnetic core part (23a), (23b
) This eliminates the occurrence of glass bubbles, etc. at the bonding surface with the bonding surface, and the bonding strength is greatly improved.

Further, since cracks are not generated in the magnetic core portions (23a) and (23b), the characteristics of the magnetic core material can be fully exhibited. Therefore, a large number of high-quality head parts can be obtained from one head block, thereby greatly improving mass productivity and yield.

Next, as shown in FIG.
) is sandwiched between the pair of erasing heads (31).

(31) are placed and integrated using fused glass.

At this time, each head part (30), (31), (
31), on both sides of the magnetic core part (25a) for recording 11, there are erase head parts (31), (3
It goes without saying that the non-magnetic materials (25h) and (25b) of 1) are arranged.

In addition, in the above bonding step, it is also possible to use the self-fusion effect of crystallized glass. That is, after arranging each of the head parts (30), (31), and (31) in two series, they can be integrated by heating while applying pressure in the direction into the figure and in the direction B. In this way, the self-fusion effect of crystallized glass can also be utilized in the bonding process of each head part (30), (31), (31).
The manufacturing process can be further simplified.

Finally, after integrating sliders made of non-magnetic material on both sides of the erasing head parts (31), (31), the surface facing the disk is cylindrically polished to form the magnetic head shown in FIG. In this case, if the above-mentioned crystallized glass is used as the slider, there is an advantage that the bonding process of the slider is also simplified.

In this way, since crystallized glass having the same coefficient of thermal expansion as the magnetic core block (23) is used as the non-magnetic block (25), each block (23).

Even if the magnetic core block (25) becomes longer, internal stress will not remain in the magnetic core block (22) or cracks will not occur. Therefore, a large number of high-quality henodic chips can be obtained from - henodic blocks.

therefore,! It is possible to provide a magnetic head that is extremely superior in terms of productivity and yield. At the same time, the bonding process between the magnetic core block and non-magnetic block or each head section is greatly simplified, and productivity is also greatly improved.

〔Effect of the invention〕

As is clear from the above description, the magnetic head of the present invention uses crystallized glass that can easily obtain an arbitrary coefficient of thermal expansion as a non-magnetic material formed integrally with the magnetic core. Internal stress and crank caused by the difference in thermal expansion coefficient between the core portion and the non-magnetic material can be eliminated, and the core material can fully exhibit its air-temperature characteristics.

In addition, the above-mentioned crystallized glass exhibits an adhesive effect when heated, so it is difficult to bond the magnetic core part and non-magnetic material.
Or simply heat and press when joining each head part (,
Fi! j'! This enables bonding with excellent properties.

therefore,! ! ! The manufacturing process is significantly reduced, and a magnetic head with excellent productivity can be provided.

Furthermore, when manufacturing each head part, even if a long magnetic core block and crystallized glass are fusion-bonded, the reliability of this joint will be degraded. A large number of high-quality head chips (head parts) can be obtained from Sodobro, making it a magnetic head that is advantageous in terms of mass productivity and yield.

[Brief explanation of drawings]

FIG. 1 is a plan view showing the magnetic disk contacting surface of a magnetic head suitable for the present invention. 2 to 7 are schematic perspective views showing the manufacturing method of the magnetic head according to the present invention according to the manufacturing process. Figure 4 shows the groove forming process of the block, Figure 4 shows the groove forming process of the erase head block, Figure 5 shows the slicing process of the recording/reproducing head block, Figure 6 shows the slicing process of the erasing head block, and Figure 7 shows the recording/reproducing head block slicing process. 7A and 7B show the steps of integrating the do part and the erasing head part, respectively. FIG. 8 is a plan view showing a surface of a conventional magnetic head that faces a magnetic disk.

Claims (1)

[Claims] In a magnetic head formed by joining a recording/reproducing head section and an erasing head section each made of a composite of a magnetic core section and a non-magnetic material, and integrating the recording/reproducing head section with the erasing head section, each of the above-mentioned A magnetic head characterized in that the non-magnetic material of the head portion is crystallized glass, and the crystallized glass itself is heated and fused to form a composite.