JPH01298510A - Production of magnetic head - 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] [Industrial Application Field] The present invention relates to a method for manufacturing a magnetic head, and in particular to a method for improving the magnetic properties of the magnetic head by improving the magnetic film formed on the core made of a magnetic material. The present invention relates to a method of manufacturing a magnetic head.

[Problem that the invention seeks to solve]

Metal tapes are used as recording media in recording devices such as 8mm video tape recorders and R-DATs, and Fe-A It - is used as a magnetic head compatible with the metal tapes in the gap of a core made of a magnetic material such as ferrite. 5i
There is a so-called metal-in-gap device in which a magnetic film with a high magnetic flux density such as Sendust (registered trademark) is arranged.

The magnetic head described above first processes a core block made of a pair of ferrites, and then processes Fe-
A magnetic film such as A1-5i is formed by a method such as sputtering, and then the magnetic film surfaces of each core block are butted and glass-bonded to form a magnetic helad core lock.Then, the magnetic head core block is cut, and the coil is assembled. It is formed by winding.

However, at the interface between the ferrite core block and the magnetic film, there are: ■ machining strain on the core processed surface, ■ a crystal defect layer at the initial stage of magnetic film formation, and ■ the magnetic film when the ferrite core and the magnetic film are brought into contact and heated. A reaction occurs in which the Affi in the core takes away oxygen from the core, and distortion is likely to occur due to oxygen movement, etc., which deteriorates the magnetic properties in that area, reduces head efficiency, and creates a so-called pseudo gap. There are problems such as increasing the effect.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method for manufacturing a magnetic head that solves the above-mentioned problems by forming a magnetic thin film having a -like surface in advance on the magnetic film forming surface of the core block.

Means and operation for solving the r problem] In order to solve the above problems, in the present invention, a magnetic thin film as a base is formed in advance on the magnetic film forming surface of the ferrite core block, and a desired magnetic thin film is formed on the magnetic thin film surface. The manufacturing method was adopted to form a magnetic film.

By manufacturing the magnetic head as described above,
The magnetic film formed on the surface of the ferrite core block is well formed without being affected by the strain generated in the ferrite core block, improving the magnetic head characteristics.

[Example] FIGS. 1 to 8 are diagrams showing an example of a method for manufacturing a magnetic head according to the present invention. The manufacturing process of the magnetic head will be explained. First, as shown in Fig. 2, a core block 1 made of a magnetic material such as ferrite material is prepared.Next, after the surface of the core block 1 is polished, C grooves (svA windows) 4 and reinforcing grooves 5 are prepared.
, winding guide 6, and machining in this order.
A C core block 2 is formed as shown in FIG. Similarly,
After surface polishing the core block 1, C groove (winding window) 4,
The winding guide 6 and the comb are machined in this order to form the block 3 of the I core as shown in FIG. In the area shown by the dotted line in the figure and Figure 6 (Nashiji pattern),
A magnetic film 11, 12 made of Pe-Alt-5t or the like having a higher saturation magnetic flux density than the magnetic material of both core blocks 2.3 is formed. Regarding the formation of magnetic films 11 and 12, FIG. 1(A)
, (B), and (C). FIG. 1 is an enlarged view of a portion of block 2 of the C core. First, as shown in Figure (A), the surface of block 2 was coated with Fe-A 1-5i magnetic material as a target material in an atmosphere in which oxygen gas (08), an active gas, was added to Ar, an inert gas. A first magnetic film 1110 having a thickness of about 1 μm is formed by sputtering. After heat treatment, sputter etching is performed in an Ar atmosphere to form a first magnetic film 1110 with a thickness of about 0.1 μm as shown in FIG. 0.5
μ-magnetism 11110' is formed. Here, magnetic 11
110,10'' is sputtered in an atmosphere containing Ar and oxygen gas, so a thin film for the base with a --like surface is formed on the block 2, covering the strain that occurs on the block 2 and removing the ( The 0th order becomes Fe-A It -5t
Using a magnetic material as a target material, a second magnetic film 11 having a thickness of 4 to 5 μm is formed by sputtering in an atmosphere containing Ar and nitrogen gas (Nf), which is an active gas.

Here, the magnetic WA11 has a −-like magnetic IlI O′ on the surface.
Since it is formed on top of the magnetic field, a --like film is similarly formed, and it is sputtered in an atmosphere containing Ar and nitrogen gas to form a film with good magnetic properties.

■Core block 3 is also set to Fe-A j! in the same way as C core block 2. -5t magnetic film 12 is formed.

Next, add a non-magnetic insulating film (SiJ, Tag's, etc., not shown) to form a gap on the magnetic film of one of the core blocks.
After sputtering to a film thickness of about 0.2 p-, both blocks 2.3 facing each other as shown in FIG. The glass rods 13 and 14 respectively placed in the C groove 4 and reinforcing groove 5 of the C core block 2 are melted to fix both blocks 2.3 to form a magnetic head core block 15 as shown in FIG. 8.

In FIG. 8, numerals 13' and 14' indicate melted glass rods 13 and 14 in FIG. 7, respectively.
Next, the magnetic core block 15 slides.

After making an R on the surface side 16 by cylindrical polishing, dotted line X.

By cutting 37 along Y, a magnetic rad core 17 is formed as shown in FIG. Reference numeral 18 is a gap.

A magnetic head is formed by winding a coil (not shown) over the winding window 4 of the magnetic head core 17 and the winding guide 6.

In the method for manufacturing the magnetic head described above, a magnetic thin film for the base is formed on the ferrite core block 2.3 in advance, and a magnetic film is formed on the magnetic layer, so that the film is not attached to the surface of the core block 2.3. Since it is not affected by the generated strain and the magnetic thin film serves as a base film, reaction between the ferrite core block 2.3 and the magnetic film is prevented.

In addition, in the above explanation, FIe-A is used as the magnetic thin film or magnetic film.
Although Q-St (Sendust) magnetic material is used, the present invention is not limited to this, and a magnetic material with a high saturation magnetic flux density such as an amorphous alloy may be used.

〔Effect of the invention〕

As described above, in the method for manufacturing a magnetic head of the present invention, a magnetic film having a saturation magnetic flux density higher than that of the core is formed on each of a pair of core blocks made of a magnetic material, and then the magnetic films are butted against the core blocks. In a method for manufacturing a magnetic head, in which a magnetic head core block is formed by bonding the magnetic head core block to form a magnetic head core block, and a magnetic head is formed by cutting the magnetic head core block, a magnetic thin film for an underlayer is preliminarily applied to the magnetic film forming surface of the core block. As a result, a good magnetic film can be formed and a magnetic head can be obtained in which deterioration of magnetic properties due to core distortion can be prevented.

[Brief explanation of the drawing]

1 to 9 show a first embodiment of the method for manufacturing a magnetic head according to the present invention, and FIGS. 1(A) and 1(B) are enlarged views showing how a magnetic thin film is formed on a core block, respectively. Figure 1 (
C) is an enlarged view showing how the magnetic film is formed on the core block, Fig. 2 is a perspective view of the main part of the core block, Fig. 3 is a perspective view of the main part of the C core block, and Fig. 4 is the main part of the core block. Fig. 5 is a perspective view of the main part of the block with a magnetic film formed on the C core block, Fig. 6 is a perspective view of the main part with the magnetic film formed on the I core block, and Fig. 7 is a perspective view of the main part with the magnetic film formed on the C core block. Core block and■
FIG. 8 is a perspective view of the main part of the magnetic head core block, and FIG. 9 is a perspective view of the magnetic head core. 1...Core block 10°...Magnetic thin film 11.1
2...Magnetic film, 13°, 14''...Glass, 15...Magnetic head core block Patent applicant Mitsumi Electric Co., Ltd. Fig. 1 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 9 314° 2 Figure 2 Figure 3

Claims (1)

[Claims] A magnetic head core block is formed by forming a magnetic film having a higher saturation magnetic flux density than that of each core block on a pair of core blocks made of a magnetic material, and then joining the core blocks so that the magnetic films are butted against each other. , a method of manufacturing a magnetic head in which a magnetic head is formed by cutting the magnetic head core block, the method comprising forming a magnetic thin film as a base in advance on the magnetic film forming surface of the core block. .