JPS62192021A - 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 recording and reproducing head part and an erasing head part into a compound in one body linearly sandwiching a non-magnetic material in which a crystallized glass is heated and welded. CONSTITUTION:A recording and reproducing head part 11 and an erasing head part 12 are arranged sandwiching a non-magnetic material 13, and magnetic gaps g2 and g3 of the head part 12 are arranged so as to be positioned at the both sides of the rearward of the magnetic gap g1 of the head part 11. The crystallized glass is used as a non-magnetic material 13, and by heating and connecting with pressure confronting the head parts 11 and 12 with the non- magnetic material 13, glass in crystal is melted out, and melted out glass is welded on magnet cores 11a and 12a, and by performing a cooling in this state, they are made into a compound in one body. Therefore, a complicated process, such that a melted glass is poured, or that welded glass is coated on a joining plane, etc., in a conventional method, is made unnecessary, thereby, a manufacturing process is simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic head, and more particularly to a so-called tunnel erase type magnetic head used in a magnetic disk drive.

[1 Summary of the Invention] The present invention provides a tunnel erase type magnetic head in which a recording/reproducing head portion and an erasing head portion are integrated in series with a non-magnetic material sandwiched therebetween, in which the non-magnetic material is crystallized. By using glass and integrating the crystallized glass itself by heat fusing, the magnetic properties of each of the above-mentioned heads are good, and the productivity and mass production are excellent.

[Prior Art] For example, magnetic disks such as floppy disks are relatively easy to handle and can record large amounts of signals, so their use as external storage devices for minicomputers, office computers, personal computers, etc. is expanding. ing.

The above-mentioned floppy disks record information signals on concentric solid tracks, and in order to ensure compatibility of the information signals, the information signals are recorded in track widths that are slightly narrower than the track pitch of normal disks. It is being said. In other words, the magnetic head built into the disk device has the ability to record information on the disk even if the note section is off-track (positional deviation) with respect to the recording track. In order to guarantee the interval between information signals, a so-called tunnel erase type magnetic head is used in which an erasing head section for erasing both sides of a recorded signal is disposed behind a recording/reproducing head section.

By the way, in this type of magnetic head, the recording/reproducing head section and the erasing throat section are integrated into a composite body, and at the same time, the recording/reproducing head section and the erasing throat section are integrated in order to suppress magnetic interference between the respective head sections. It is necessary to magnetically separate the two.

That is, as shown in FIG.
1) and the erasing head section (52), there is a non-magnetic material (53) between the
A magnetic head is used which has a structure in which the head parts are magnetically separated and integrated by interposing the head parts. Furthermore, usually each head part (51).

The slider (52) made of non-magnetic material protects the
55) and (56) are provided.

Conventionally, various methods have been employed to integrate the above-mentioned recording/reproducing head section (51), erasing head section (52), and non-magnetic material (53). Specifically, (^) a groove is provided in a part of the joint surface of the recording/reproducing head section (51) and the erasing head section (52), and molten glass is poured into this groove.
Each head part (51
), (52) is fusion-bonded and magnetically separated.

(B) Recording/reproducing head section (51) and erasing head section (52)
) and magnetically separate the non-magnetic material by sandwiching it between
Each head part (51), (52) and non-magnetic material (53)
) fused glass (54) on part or all of the joint surface of the
(54) is coated by a method such as sputtering or coating, and then heat-fused and bonded.

A recording/reproducing head section (51) and an erasing head section (52) such as
An example of this method is to interpose an adhesive such as molten glass (54) between the bonding surfaces.

[Problem that the invention seeks to solve]

However, the above method (A) has 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, and the like. Therefore, in order to eliminate the glass bubbles and cranks, strict process control is required for this bonding process, resulting in a decrease in productivity and yield.

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

Furthermore, in any of these methods, each head portion (5
1), (52) are composed of ferrite and non-magnetic material (
53) Due to the large difference in thermal expansion coefficient from the ceramics that make up the bonding process, internal stress is generated in each head part during this fusion process, and in some cases, cracks may occur in the head part. This causes deterioration of the mechanical strength or magnetic properties of the metal. In addition, cracks caused by such thermal expansion coefficients are particularly noticeable when a head block is manufactured by joining long recording/reproducing blocks, erasing blocks, and non-magnetic blocks, respectively. into many,
Even if a horse chestnut knob is cut out, the reliability is poor, and this poses a major problem in terms of mass production and yield.

Therefore, the present invention was proposed in view of the above-mentioned circumstances, and an object of the present invention is to provide a magnetic head that has good magnetic properties in a recording/reproducing head section and an erasing head section, and is also excellent in productivity and mass production. shall be.

[Means for solving problems]

In order to achieve this object, the magnetic head of the present invention is a magnetic head in which a recording/reproducing head section and an erasing head section are integrated in series with a non-magnetic material sandwiched therebetween, in which the non-magnetic material is crystallized. It is characterized by being made into a composite and integrated crystallized glass by heating and fusing the crystallized glass itself.

[Function] Crystallized glass is non-magnetic and has high mechanical strength, and by changing the composition and heating conditions for crystallization, it is extremely easy to obtain an arbitrary thermal expansion coefficient. Further, when the crystallized glass is heated, the glass in the crystals is eluted, and this eluted glass has a fusion effect.

Therefore, by simply abutting the recording/reproducing head section and the erasing head section and heat-pressing them so as to sandwich the crystallized glass, they can be easily integrated into a composite structure, and at the same time, magnetic separation between the respective head sections can be achieved. Further, since the crystallized glass can be selected from a glass having a coefficient of thermal expansion equivalent to that of each head, cracks are eliminated.

(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 recording/reproducing head section (11) that inputs and outputs information signals to a magnetic disk, and an erasing head section (12) that erases signals written on the magnetic disk are made of non-magnetic material (13). ) are placed between them. There is a magnetic gap gz+g of the erasing head section (12) on both sides behind the magnetic gap g- of the recording/reproducing throat section (11).
z is located. Therefore, the magnetic disk is moved in the X direction in the figure. A guard band is formed by recording an information signal using a magnetic gap gl and erasing both sides of the recorded signal using a magnetic gap gz+gz. Therefore, data is recorded on the magnetic disk with a distance between the magnetic gaps gz+gz of the erase head, that is, a width of 7w in the figure. Therefore, even if the recording/reproducing head section (11) goes off-track with respect to the recording track of the disk, the interval between the signals recorded on the disk is guaranteed, so good recording/reproducing characteristics can be obtained. It will be done. Furthermore, each of these head parts (1
A slider (14) made of a non-magnetic material such as barium titanate or calcium titanate, sandwiching 1) and (12).
, (15) are integrated to ensure stable contact with the magnetic disk.

Here, in the present invention, by using crystallized glass as the non-magnetic material (13), the recording/reproducing head part (11) and the erasing head part (12) and magnetic separation and bonding are performed at the same time.

That is, when crystallized glass, which is a non-magnetic material, is heated, the glass in the crystals is eluted, and this eluted glass has a fusing action. For this reason, each head part (11
), (12) and the non-magnetic material (13) are butted together and heated and pressed together, the glass particles in the crystal are ejected, the eluted glass adheres to the magnetic cores (lla) and (12a), and is cooled in this state. By doing so, it is possible to integrate the composite.

Therefore, pouring molten glass as before,
Alternatively, complicated processes such as coating the bonded surfaces with fused glass are no longer necessary, simplifying the manufacturing process and greatly improving productivity. At the same time, the occurrence of glass bubbles can be eliminated, so heads with excellent reliability can be manufactured with a high yield through gentle process control.

Further, the above-mentioned crystallized glass also has the advantage that by changing its composition and the heating conditions (temperature, etc.) for crystallization, it can be bent to easily obtain a desired coefficient of thermal expansion. For this reason, each head part (11), (12)
The core (lla), the material of (12a) that constitutes
materials, such as Ni-Zn ferrite (coefficient of thermal expansion from rich temperature to 400°C: 80X10-' to 105X10
-'deg-') and Mn-Zn ferrite (same as:
100xlO-' ~ 130xlO-)deg
-'), etc., which has a coefficient of thermal expansion approximately equal to
13) can be easily obtained. Therefore, the internal stress and crank caused by the difference in thermal expansion coefficient between each head portion (11), (12) and the non-magnetic material (13) can be eliminated, resulting in a magnetic head with excellent magnetic properties.

As the crystallized glass having such characteristics, one having excellent abrasion resistance and impact resistance is preferable; for example, Liz
o, S i Ox + Δ1zO*, NazO.

A material whose main component is an oxide such as CaO is suitable.

In addition, the sliders (1
4) If the above-mentioned crystallized glass is used as the sliders (14) and (15), there is an advantage that the bonding process for the sliders (14) and (15) is also simplified.

On the other hand, in order to manufacture the above-mentioned magnetic head, as shown in FIG. 2, a recording/reproducing block (21) having a large number of magnetic gear knobs g for recording/reproducing processed to a predetermined core thickness;
Similarly, an erasing block (22) having a large number of magnetic gears for erasing, pu g2, butts against each other so as to sandwich a non-magnetic block (23) (crystalline glass) with a thickness of about 50 to 100 μIn. Pressure in Z direction (0,5~
3kg-cmf) 600-850 in a heating furnace
After heating and fusing at ℃ and slowly cooling, the A-A line and A'-A line in the figure
A slining process is performed at the 'fi position to obtain a plurality of magnetic head chips.

Note that each block (21) and (22) is preferably pressurized even when the heating temperature reaches the maximum temperature.

In this way, since the non-magnetic block (23) is made of crystallized glass having the same coefficient of thermal expansion as the core material of each head portion (21), (22), each block (21), ( 22) and (23) become longer, to each.

No internal stress remains or cracks occur in the cores of the block (21), (22).

Therefore, a larger number of highly reliable head chips than one block can be obtained. Therefore, it is possible to provide a magnetic head that is extremely superior in terms of mass productivity and yield.

[Effects of the Invention] As is clear from the above description, the magnetic head of the present invention has crystallized glass interposed between the recording/reproducing throat section and the erasing head section, which can easily obtain an arbitrary coefficient of thermal expansion. As a result, internal stress and cracks caused by the difference in thermal expansion coefficient between each head portion and the non-magnetic material can be eliminated, and the magnetic properties of the core material can be fully exhibited.

In addition, the above-mentioned crystallized glass exhibits an adhesive effect when heated, so when bonding each head portion to a non-C4L material, it is possible to bond with high reliability by simply applying heat and pressure. . Therefore, the number of manufacturing steps is significantly reduced, and a magnetic head with excellent productivity can be provided.

Furthermore, when manufacturing the above-mentioned magnetic head, even if one piece of each elongated head and crystallized glass are fused and bonded, the bonding properties (3-tightness) are excellent.
Since a large number of high-quality head chips can be obtained from one head block, the magnetic head is advantageous in terms of mass productivity and yield.

[Brief explanation of drawings]

FIG. 1 is a plan view showing the contact surface of a 611 disk of a magnetic head suitable for the present invention, and FIG. 2 is a schematic perspective view showing the joining process of a recording/reproducing head block, an erasing block, and a magnetic book. be. FIG. 3 is a plan view showing a surface of a conventional magnetic head that faces a magnetic disk.

Claims (1)

[Claims] A magnetic head in which a recording/reproducing head section and an erasing head section are integrally integrated in series with a non-magnetic material in between, wherein the non-magnetic material is a crystallized glass, and the crystallized glass itself is A magnetic head characterized by being integrated into a composite body by heat fusing.