JPH06124407A - Manufacture of magnetic head - Google Patents

Abstract

PURPOSE:To decrease the loss at the recording/reproducing time by reducing factors of the shift of the azimuth angle. CONSTITUTION:Substrate blocks 17a, 17b are bonded at a reference of a gap confronting face 12. A recessed part is provided in a tool 20 facing to a reference face 13 of the substrate block 17a. The reference block 17a is accommodated in the recessed part. The substrate block 17b at the side facing the gap confronting face 12 is in touch with the inclined surface of the tool 20 at the end part thereof. Therefore, the shift of the azimuth angle theta can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head manufacturing method, and more particularly to a video tape recorder (VT).
In a magnetic recording / reproducing apparatus such as R), the present invention relates to a method of manufacturing a magnetic head including a soft magnetic thin film forming a magnetic circuit and a substrate supporting the soft magnetic thin film.

[0002]

2. Description of the Related Art With the increasing density of magnetic recording technology,
For example, at present, a medium having a high coercive force such as a metal tape has become mainstream, and a core material used for a magnetic head is required to have a high saturation magnetic flux density. Under such circumstances, a soft magnetic thin film having a high saturation magnetic flux density as shown in FIG. 8 is used as a core material, and the soft magnetic thin film is formed on the substrate 10 to have a film thickness substantially corresponding to a track. A substrate 10 and a soft magnetic thin film 11 with a low melting point glass 18 from above.
By molding the soft magnetic thin film 11 onto the substrate 10
There is a magnetic head using a head chip sandwiched between the low melting point glass layer 18 and the low melting point glass layer 18. When the magnetic head is used as a head chip, as shown in FIG.
Was sliced with an inclination (azimuth angle), and at the time of its attachment, the reference of the jig 24 and the reference surface 23 of the core block 21 were attached and sliced to manufacture the head chip.

[0003]

As described above, in the conventional magnetic head, for example, the loss due to the deviation of the azimuth angle is as shown in FIG. 10. In order to keep the loss within 1 dB, The deviation amount of S-VHS is 38 'when the track width is 19 μm, 13' when it is 58 μm, and
It can be seen that the track width of No. 8 is 20.5 μm and must be 23 'or less. Further, when one chip alone is deviated in the + direction, and when recording is performed by another head, another head has a problem that the head deviated in one direction further increases the loss. Also, if the reference surface and the gap surface are parallel, there is no problem, but when processing the reference surface, if there is warpage or grinding failure, it will be non-parallel to the gap surface, and as a result the azimuth will shift. Therefore, there are cases where satisfactory characteristics cannot be obtained even with a slight deviation as the recording wavelength becomes shorter.

The present invention has been made in view of such a situation, and by directly facing the gap facing surface, which determines the azimuth angle, to the reference jig, the factor for the deviation of the azimuth angle is reduced, and the recording / reproducing is performed. It is an object of the present invention to provide a method of manufacturing a magnetic head that reduces the time loss.

[0005]

In order to achieve the above object, the present invention provides a magnetic head comprising a soft magnetic thin film forming a magnetic circuit and a substrate supporting the soft magnetic thin film, and a continuous track is formed. In the step of slicing the core block in which the core blocks are formed into chips, the reference plane for determining the azimuth angle is the gap facing surface of the substrate block forming the core block.

[0006]

The core block is constructed by bonding the gap facing surfaces of two substrate blocks. The azimuth angle is determined by forming a recess in the jig facing the reference surface of one substrate block, embedding the one substrate block in the recess, and making the end of the gap facing surface contact the inclined surface of the jig. By using the reference surface, it is possible to reduce the factor of deviation of azimuth, and as a result, it is possible to reduce loss during recording / reproduction and to cope with short recording wavelengths.

[0007]

Embodiments will be described below with reference to the drawings. 1 to 8 are configuration diagrams for explaining an embodiment of a magnetic head manufacturing method according to the present invention, in which 10 is a substrate, 11 is a soft magnetic thin film, 12 is a gap facing surface, and 13 is a reference surface. , 14 is a V-shaped groove, 15 is an inner winding groove, 16 is an outer winding groove, 17a and 17b are substrate blocks, 18 is a low-melting glass, 19 is a core block, and 20 is a jig.

The magnetic head according to the present invention has the structure shown in FIG.
As shown in, a head chip having a high saturation magnetic flux density is used. This head chip has, for example, a pair of substrates 10 formed of a non-magnetic material such as photosensitive crystallized glass, crystallized glass, or ceramics, or an oxide magnetic material such as soft magnetic ferrite. First,
As shown in FIG. 1, a surface of a substrate made of the above-mentioned non-magnetic material or oxide magnetic material has a predetermined pitch dimension A of approximately V.
The V-shaped groove 14 is formed. Then, as shown in FIG.
A soft magnetic thin film 11 made of a Fe-Al-Si alloy is formed on the wall surface of the V-shaped groove 14 with a predetermined film thickness by vacuum deposition or sputtering. Next, as shown in FIG. 3, after filling the V-shaped groove 14 with the low-melting glass 18, the V-shaped groove 14 and the low-melting glass 1 are filled as shown in FIG.
The low-melting glass is polished into a flat shape so that the apexes 8 coincide with each other and the low-melting glass 18 protruding to the head sliding surface is removed. Next, as shown in FIG. 5, the inner winding groove 15 and the outer winding groove 16 are formed on both side surfaces of the substrate 10.
And a non-magnetic gap material such as SiO ₂ (not shown) is formed by vacuum vapor deposition or sputtering so that a predetermined gap is formed on the gap facing surface 12 on the side where the glass filling groove is formed. To form the substrate block 17a.

After that, as shown in FIG. 6, the gap facing surfaces 12 of the pair of substrate blocks 17a and 17b are aligned so as to face each other and fixed by pressure, and joined to form the core block 19. Form. Then, FIG.
By using a jig 20 having a concave portion for making an azimuth angle by the above method, the gap facing surface 12 is attached as a reference, and as shown in FIG. 6, the core block 19 has a predetermined pitch along the broken line. The head chip shown in FIG. 8 is obtained by cutting at B. Then, after the head chip is adhered and fixed to a base plate (not shown), coil winding is performed, and then table polishing is performed to form a magnetic head. In FIG. 7, the substrate blocks 17a and 17b are attached to each other with the gap facing surface 12 as a reference. The jig 20 facing the reference surface 13 of the substrate block 17a is provided with a concave portion, the substrate block 17a is embedded in the concave portion, and the gap facing surface 12 side of the substrate block 17b is in contact with the inclined surface of the jig 20 at its end. There is. In this way, the deviation of the azimuth angle θ can be reduced.

[0010]

As is apparent from the above description, the present invention has the following effects. In other words, by directly facing the gap facing surface, which determines the azimuth angle, to the reference jig, it is possible to reduce the factors that cause the azimuth shift, and as a result, it is possible to reduce the loss during recording / reproduction and also to reduce the recording wavelength. You can respond.

[Brief description of drawings]

FIG. 1 is a process diagram (1) for explaining an embodiment of a method of manufacturing a magnetic head according to the present invention.

FIG. 2 is a process diagram (2) for explaining one embodiment of the method of manufacturing a magnetic head according to the present invention.

FIG. 3 is a process diagram (No. 3) for explaining the embodiment of the method of manufacturing the magnetic head according to the present invention.

FIG. 4 is a process diagram (No. 4) for explaining the embodiment of the method of manufacturing the magnetic head according to the present invention.

FIG. 5 is a process view (5) for explaining the embodiment of the method of manufacturing the magnetic head according to the present invention.

FIG. 6 is a process diagram (6) for explaining one embodiment of the method of manufacturing a magnetic head according to the present invention.

FIG. 7 is a process diagram (No. 7) for explaining the embodiment of the method of manufacturing the magnetic head according to the present invention.

FIG. 8 is a process drawing (8) for explaining the embodiment of the method of manufacturing the magnetic head according to the present invention.

FIG. 9 is a diagram showing how a core block and a jig are attached in a conventional method of manufacturing a magnetic head.

FIG. 10 is a diagram showing various conventional azimuth loss characteristics.

[Explanation of symbols]

Reference numeral 10 ... Substrate, 11 ... Soft magnetic thin film, 12 ... Gap facing surface, 13 ... Reference surface, 14 ... V-shaped groove, 15 ... Internal winding groove, 16 ... External winding groove, 17a, 17b ... Substrate block, 18 … Low melting point glass, 19… Core block, 20…
jig.

Claims (1)

[Claims] 1. A magnetic head comprising a soft magnetic thin film that constitutes a magnetic circuit and a substrate that supports the soft magnetic thin film, wherein the core block in which tracks are continuously formed is sliced into chips. At this time, a method of manufacturing a magnetic head, characterized in that a reference surface for determining the azimuth angle is a surface facing a gap of a substrate block forming a core block.