JPH0278002A - Magnetic head and production thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic head used in, for example, a VTR, FDD, FXD, etc., and a method for manufacturing the same.

[Conventional technology]

FIG. 4 is a perspective view showing a conventional magnetic head of this kind disclosed in, for example, Japanese Patent Application Laid-open No. 175915/1982, and FIG. 5 is a plan view thereof. In the figure, (1) and (2) are a pair of cores arranged opposite to each other to form a magnetic circuit, and M
The material is polycrystalline or single crystal high magnetic permeability ferrite such as n-Zn or Ni-Zn. (2a) is the core (2)
The winding window (3) is formed in the shape of a groove in the core (1) (
2) is an alloy magnetic material with a high saturation magnetic flux density provided on the back surface of the opposite side, and is attached when particularly excellent magnetic properties are required, for example for metal tape.
-Zr -Nb Made of amorphous or the like.

(4) is a magnetic gap formed in the opposing upper portions of both cores (1) and (2), and is constituted by a non-magnetic material layer formed on the surface of the alloy magnetic material (3). (5) is a high melting point glass material arranged at the apex portion of the white clay end of the winding window (2a), which fixes both cores (1) and (2) together.

(6) is the upper surface of cores (1) and (2), that is, the magnetic gap (
A low melting point glass material is heat molded into a groove (7) formed on a surface having a track width W of a magnetic head.
It regulates T.

Next, a method for manufacturing the magnetic head shown in FIGS. 4 and 5 will be explained with reference to FIGS. 6 to 6. First, a pair of rectangular cores (1) and (2) shown in FIG. 6 are prepared. Then, as shown in FIG. 7, a groove that will become a winding window (2a) is formed on the opposing side surface of the core (2) by grinding using a rotating grindstone. Next, as shown in FIG. 8, an alloy magnetic material (3) is formed on the opposing surfaces of both cores (1) and (2) by a method such as vapor deposition or sputtering. Then, a layer of non-magnetic material (8) is further formed on the surface (9th layer).
figure).

Both cores (1) and (2) with the above processing completed are the 10th
As shown in the figure, winding windows (2a) are arranged oppositely.
Insert the high melting point glass material (5) into the apex part of the inside and heat it to a predetermined temperature in this state to heat the high melting point glass material (5) to -
Once melted and then cooled, both cores (1) (2)
is firmly fixed through this high melting point glass material (5),
It becomes an integrated structure. Next, as shown in FIG. 11, a plurality of grooves (7
) to the apex depth. As described above, this groove (7) is formed on the surface of the magnetic gap (4) in contact with the recording medium in order to regulate the track width wT. A low melting point glass material (6) is inserted into this groove (7) and heated and molded, and then, as shown in the bhikkhu diagram, it is cut at A-A and B-B' in the figure and polished to increase its thickness. First, the magnetic head shown in FIGS. 4 and 5 is obtained.

The reason why we decided to use a high melting point glass material when fixing both cores (1) and (2) as the glass material, and a low melting point glass material when molding the groove (Julyzeta) was due to the time constraints. The glass material (5) that was fixed in the previous process is melted by the heating and temperature increase during mold forming, which is the subsequent process, and the core (5) is melted.
1) This is to prevent the fixed state in (2) from being broken.

[Problem to be solved by the invention]

The structure and manufacturing method of the conventional magnetic head are as described above, so by using a molded glass material (6) with a melting point lower than that of the glass material (5) that fixes the core, This prevents the core from breaking during molding. However, depending on the combination of materials,
The glass material (5) for fixing softens to some extent due to the temperature during molding, and the magnetic gap (4), which requires extremely high precision, is
) and track width.

In order to prevent this, a glass material having as large a difference in melting point as possible may be used, but this selection is not necessarily easy within a limited range that also takes into account other usage conditions.

Furthermore, since the glass material (5) to which the core is fixed has a high melting point, the alloy magnetic material (3) is also heated during this fixing process. As a result, there was a problem that the temperature rose to about 700° C. or higher and the excellent magnetic properties deteriorated.

This invention was made in order to solve the above-mentioned problems, and it provides a magnetic head and a magnetic head in which the magnetic gap of the core is widened and the track does not shift even if a glass material is molded to regulate the track width. It is an object of the present invention to provide a manufacturing method thereof, and further, to obtain a magnetic head that can prevent deterioration of the magnetic properties of the alloy magnetic material.

[Means to solve the problem]

The magnetic head according to the present invention employs a crystallized glass material to fix the core together.

Furthermore, this crystallized glass material is one whose crystallization temperature is lower than the temperature at which the magnetic properties of the alloy magnetic material deteriorate.

Further, the step of fixing the core together is performed by heating and cooling the crystallized glass material, and the step of molding it into the groove formed in the surface having the magnetic gap is performed by crystallizing the crystallized glass material. This is done by heat molding a glass material that has a melting point lower than the temperature.

[Effect]

In this invention, first, a crystallized glass material is interposed between the opposing portions of a pair of cores that are placed opposite to each other with a magnetic gap interposed therebetween, and the two cores are integrated by heating and cooling. Once a crystallized glass material is melted and solidified, it crystallizes and its melting point rises significantly above its initial melting point, which is the crystallization temperature. Next, a groove for regulating the track width is formed on the surface of the i-shaped core having the magnetic gap. Furthermore, a glass material having a melting point lower than the crystallization temperature of the crystallized glass material is heat molded into this groove. At this heating temperature, no track deviation occurs when the magnetic gap is widened.

Further, the heating temperature for fixing the cores together is set to the crystallization temperature of the crystallized glass material, which does not deteriorate the magnetic properties of the alloy magnetic material.

〔Example〕

FIG. 1 is a perspective view showing a magnetic head in one embodiment of the invention. In the figure, the difference from the conventional one is the core (
1) Winding window (2a) for attaching (2) together
The glass material placed in the apex part at the top of the inside.Crystallized glass material is used here. The low melting point glass material (6) molded into the groove (7) is selected to have a melting point lower than the crystallization temperature of the crystallized glass material (9).

FIG. 1 shows the external shape of the magnetic head, and the manufacturing method thereof is the same as the conventional method explained with reference to FIGS.

However, in this embodiment, the cores (1) and (2) are fixed by a crystallized glass material (9). Once this crystallized glass material (9) is melted and solidified, part or all of it crystallizes, and its mechanical strength improves and its melting point is much higher than the initial crystallization temperature (for example, 10
(approximately 0°C or higher). As a result, a low melting point glass material (6
) The temperature difference between the melting point after crystallization of the crystallized glass material (9) with respect to the required heating temperature during hot mold forming increases by at least the above-mentioned increase, and the crystallized glass material (9) due to heating during mold forming increases by at least the above-mentioned increase. prevent the softening phenomenon. In other words, a magnetic head with good precision and high performance can be obtained without any deviation of the track of the magnetic gap (4).In addition, as mentioned above, since there is an increase in the melting point due to crystallization, There is no need to use an unnecessarily high crystallization temperature for the glass-ceramic material (9), and it should be set at a temperature of, for example, about 400 to 600''C!, so as not to deteriorate the magnetic properties of the alloy magnetic material (3). By keeping the temperature within the range of , it is possible to utilize the excellent magnetic properties of the alloy magnetic material (3) as they are without impairing them, and to achieve high performance of the magnetic head.

In addition, in the above example, a case was shown in which the alloy magnetic material (3) was formed on the surfaces of both cores (1) and (2), but
Depending on the performance specifications required of the magnetic head, it may be provided only on the negative core (1) or (2).
Further, as shown in FIG. 2, a structure may be adopted in which this alloy magnetic material is not formed at all and is used as a ferrite head.

Furthermore, as shown in FIG. 3, by incorporating the chip Ql of the magnetic head according to the present invention into a slider α made of ceramic or the like, whose upper surface side in the figure is a floating surface facing the medium, a floating type for FXD can be obtained. It can also be used as a head.

〔Effect of the invention〕

As described above, in this invention, since a crystallized glass material is used as the glass material for fixing the core together, the glass material is then molded into the groove regulating the track width formed on the surface of the core having the magnetic gap. Even if the core etc. are heated for molding, the melting point of the crystallized glass increases due to crystallization, making it difficult to soften accordingly, and deviation of the magnetic gap track is prevented.

In addition, if the crystallization temperature of the crystallized glass material is lower than the temperature that degrades the magnetic properties of the alloy magnetic material, the magnetic properties of the alloy magnetic material will not deteriorate during the core fixing process, and high-performance magnetic The head can be realized.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a magnetic head according to one embodiment of the present invention, FIG. 2 is a perspective view showing a magnetic head according to another embodiment, and FIG. 3 is an FXD device to which the magnetic head chip according to the present invention is applied. FIGS. 4 and 5 are perspective views showing a floating head, FIGS. 4 and 5 are a perspective view and a plan view, respectively, showing a conventional magnetic head, and FIGS. 6 to 6 are views explaining the manufacturing process of the magnetic head in order. - In the figure, (1) and (2) are a pair of cores, (3)
is an alloy magnetic material, (4) is a magnetic gap, (6) is a low melting point glass material, (7) is a groove, (9) is a crystallized glass material, WT
is the track width. Note that the same reference numerals in each figure indicate the same or corresponding parts. Agent: Masuo Oiwa, Patent Attorney: Figure 1 Figure 2 Figure 4 Figure 5m Figure 6 Figure 7a Figure 8 Figure 9 Figure 10

Claims (1)

[Claims] 1. A step of arranging a pair of cores facing each other with a magnetic gap interposed therebetween, interposing a crystallized glass material in a part of the facing portion, heating and cooling the two cores, and integrating the two cores. forming a groove for regulating the track width of the magnetic head on the surface of the core having a magnetic gap; and heating molding a glass material having a melting point lower than the crystallization temperature of the crystallized glass material into the groove. A method for manufacturing a magnetic head with. 2. A pair of cores that are arranged opposite to each other with a magnetic gap interposed therebetween and are integrated with each other by interposing a crystallized glass material in a part of the opposing parts and heating and cooling them, and on the surface of this core that has the magnetic gap. A magnetic head that includes a glass material that is heat molded into a groove that regulates the track width of the formed magnetic head. 3. An alloy magnetic material with a high saturation magnetic flux density is arranged on the opposite surface of the core, and the crystallization temperature of the material is lower than the temperature that deteriorates the magnetic properties of the alloy magnetic material as a crystallized glass material. 3. A magnetic head according to claim 2.