JPH0845012A - Production of magnetic head - Google Patents

Abstract

PURPOSE:To uniformly wear sliding surfaces with a recording medium and to obviate, the generation of uneven wear by holding soft magnetic thin films with a pair of nonmagnetic substrates therein and forming these thin films on the sliding surfaces. CONSTITUTION:The soft magnetic thin films 2 are formed on approximately V-shaped groove surfaces formed at a prescribed pitch size on the front surface of a nonmagnetic substrate 3, by which a first substrate block 6 is formed. Low melting glass 7 is disposed on the substrate block 6 and a nonmagnetic substrate 4 having approximately the V-shaped grooves formed at the same pitch size is disposed thereon. The low melting glass 7 is then melted while load is applied thereon. As a result, both nonmagnetic substrates 3, 4 are adhered via the soft magnetic thin films 2, by which a second substrate block 9 is formed. A pair of the second substrate blocks 5, 5 are joined in such a manner that the gap surfaces face each other as shown in Fig. (C) to form a core block 17. The core block 17 is cut at a prescribed pitch B to form head chips l. As a result, the sliding surfaces on which three kinds of the different materials coexist heretofore are formed are formed of only the two kinds exclusive of the glass and, therefore, the sliding surfaces are uniformly worn and the generation of the uneven wear is averted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a magnetic head used in a magnetic recording / reproducing apparatus such as a video tape recorder, and more particularly to a soft magnetic thin film constituting a magnetic circuit and a non-magnetic material supporting the soft magnetic thin film. The present invention relates to a method of manufacturing a magnetic head including a substrate.

[0002]

2. Description of the Related Art In recent years, a high coercive force medium such as a metal tape has become mainstream with the increase in density of magnetic recording media. For this reason, the core material used for the magnetic head is required to have a high saturation magnetic flux density, and at the same time, the one having a narrowed track is required.

Therefore, the head chip 2 as shown in FIG.
A magnetic head using No. 1 has been put to practical use. The head chip 21 is formed by joining a pair of substrate blocks 25, 25 formed by sandwiching a soft magnetic thin film 22 between a non-magnetic substrate 23 and a low melting point glass 24.

In the method of manufacturing the head chip 21, first, as shown in FIG. 9, a predetermined pitch dimension is formed on the surface of a non-magnetic substrate 23 made of a non-magnetic material such as ceramics, photosensitive crystallized glass, or crystallized glass. A is a substantially V-shaped groove 23a
And the soft magnetic thin film 22 is formed on the groove surface of the groove 23a.

Next, as shown in FIG. 10, the groove 23a of the non-magnetic substrate 23 is filled with the low melting point glass 24, and the groove 23a is formed.
The low-melting-point glass 24 is planarly polished so that the top of the low-melting-point glass and the surface of the low-melting-point glass 24 coincide with each other. Then, as shown in FIG. 11, the internal winding groove 2 is formed on the surface of the substrate 23 on the one end surface side.
6, the external winding groove 27 is formed on the back surface, and the nonmagnetic gap material 29 is further formed on the gap surface 28 to form the substrate block 25.

After that, as shown in FIG. 12, the gap surfaces 28 of the two substrate blocks 25 are opposed to each other, and they are pressure-fixed and joined to form a core block 30. Next, along the sliding surface, with a predetermined pitch dimension B, the broken line L1,
The head chip 21 is cut as shown by L2 (FIG. 8).

[0007]

In the magnetic head using the above-mentioned conventional head chip, three kinds of materials having different hardness, friction coefficient, and area occupied by the head sliding surface are used for the sliding surface contacting the tape. Soft magnetic thin film, non-magnetic substrate,
Since it is mixed as a low-melting glass and is asymmetrical across the gap, running the magnetic tape for a long time causes uneven wear without evenly wearing the parts in contact with the tape,
As a result, a minute step caused by uneven wear becomes a space between the magnetic tape and the magnetic head, which causes a problem that sufficient recording and reproduction cannot be performed. In addition, the magnetic powder of the magnetic tape may adhere to the minute steps to cause clogging, and the magnetic powder may damage the magnetic head.

An object of the present invention is to provide a method of manufacturing a magnetic head in which the sliding surface of the magnetic head in contact with the magnetic tape is uniformly worn and uneven wear is prevented.

[0009]

According to the method of manufacturing a magnetic head of the present invention, a soft magnetic thin film is formed on a groove surface of a substantially V-shaped groove formed on a surface of a non-magnetic substrate with a predetermined pitch dimension. The step of forming the first substrate block and the step of forming the low melting point glass on the first substrate block, and arranging the non-magnetic substrate having the substantially V-shaped groove formed with the same pitch dimension thereon, A step of forming a second substrate block by adhering both non-magnetic substrates through a soft magnetic thin film by melting the melting point glass while applying a load, and a gap surface of a pair of second substrate blocks facing each other. And a step of cutting the core block into a head chip by cutting the core block at a predetermined pitch dimension, and the soft magnetic thin film forming the magnetic circuit is sandwiched by both nonmagnetic substrates. As sliding surface Form to.

In this case, the soft magnetic thin film and the non-magnetic substrate should be made of materials having hardness close to each other.

[0011]

According to the method of manufacturing a magnetic head according to the present invention, substantially V-shaped grooves are formed on the surface of a non-magnetic substrate at a predetermined pitch, and a soft magnetic thin film is formed on the groove surface of the formed grooves. 1
Forming a substrate block.

Next, a low melting point glass is placed on the first substrate block, and a non-magnetic substrate having substantially V-shaped grooves formed with the same pitch dimension is placed thereon, and the low melting point glass is loaded. The two non-magnetic substrates are adhered to each other via the soft magnetic thin film by being melted while applying the liquid to form a second substrate block.

Next, a pair of second substrate blocks are joined so that the gap surfaces face each other to form a core block, and the core block is cut at a predetermined pitch to form a head chip. Thus, the soft magnetic thin film forming the magnetic circuit is formed on the sliding surface so as to be sandwiched between the two non-magnetic substrates.

It is desirable that the hardness of the soft magnetic thin film and the hardness of the non-magnetic substrate are close to each other. For example, the hardness of the FeAlSi type alloy used as the soft magnetic thin film is 530 to 600, and FeTa.
The hardness of the Ti-based alloy is 1000, the hardness of the ceramic used as the non-magnetic substrate is 800, and the hardness of the crystallized glass is 650 to 750.

[0015]

1 is an external perspective view of a head chip 1 having a high saturation magnetic flux density formed according to the present invention. The head chip 1 is constructed by joining a pair of substrate blocks 5 and 5 formed so that both sides of a strip-shaped soft magnetic thin film 2 are sandwiched by non-magnetic substrates 3 and 4.

The method of manufacturing the head chip 1 is as follows.
For example, as shown in FIG. 2, a substantially V-shaped groove 3a with a predetermined pitch dimension A is formed by dicing on the surface of a flat plate-shaped substrate 3 made of photosensitive crystallized glass, crystallized glass or a ceramic material. Formed and then Figure 3
As shown in FIG. 3, FeAlSi is formed on the groove surface of the groove 3a with a predetermined film thickness (about 2 to 30 μm) by vacuum deposition or sputtering.
A soft magnetic thin film 2 made of a system alloy is formed to form a substrate block 6.

Next, as shown in FIG. 4, a low-melting glass 7 is placed on the surface of the substrate block 6, and the same material as that of the non-magnetic substrate 3 is used and a substantially V-shaped groove is formed at the same pitch dimension A. The non-magnetic substrate 4 on which is formed is placed, and a weight 8 having a predetermined weight is placed on the non-magnetic substrate 4 so that the soft magnetic thin film 2 and the substrate 4 are in close contact with each other.
And

Next, the substrate block 9 is attached to the groove 3a of the substrate 3.
To a vertex, and is polished so as to remove the protruding non-magnetic substrate 4 and low melting point glass 7. As a result, the substrate block 9 has a shape in which the soft magnetic thin film 2 is formed on the groove surface of the groove 3a of the substrate 3 and the nonmagnetic substrate 4 is filled in the groove 3a, as shown in FIG.

Next, as shown in FIG. 6, the inner winding groove 10 and the outer winding groove 11 are formed on the front surface and the back surface on one end side of the substrate block 9, and the auxiliary groove is formed on the surface on the other end side of the substrate block 9. 12 is formed. Then, a non-magnetic gap material 14 such as SiO ₂ is formed by vacuum vapor deposition or sputtering so as to form a predetermined gap on the gap surface 13 which is the surface on which the internal winding groove 10 is formed, to form the substrate block 5. .

Next, as shown in FIG. 7, the pair of substrate blocks 5 are aligned so that the gap surfaces 13 face each other, and pressure fixing is performed, and the internal winding groove 10 and the auxiliary groove 12 are respectively inserted. Bars 15 and 16 thinner than the groove are inserted, and the bars 15 and 16 are melted and joined by an electric furnace to form a core block 17.

Thereafter, the core block 17 is connected to broken lines L1 and L.
A head chip 1 (FIG. 1) is obtained by cutting along 2 along a predetermined pitch dimension B (= A × cos θ; where θ is an azimuth angle). Then, after the head chip 1 is bonded and fixed to a base plate (not shown), coil winding and tape polishing are performed to form a magnetic head.

[0022]

According to the present invention, the sliding surface with which the magnetic tape comes into contact is structured such that the soft magnetic thin film is sandwiched between the non-magnetic substrates having hardnesses close to each other.
The sliding surface in which different kinds of materials are mixed is constituted by only two kinds, and it is possible to minimize uneven wear.

As a result, the space between the magnetic tape and the magnetic head is minimized, and wide band recording can be sufficiently supported. Since the minute steps caused by the uneven wear are eliminated, the magnetic powder of the magnetic tape does not adhere, so that the magnetic head is not clogged or scratched.

[Brief description of drawings]

FIG. 1 is an external perspective view of a head chip formed according to the present invention.

FIG. 2 is a view in which a substantially V-shaped groove is formed on the surface of a flat non-magnetic substrate.

FIG. 3 is a diagram in which a soft magnetic thin film is formed on the groove surface of a V-shaped groove of a non-magnetic substrate.

4 is a low-melting glass on the substrate block shown in FIG.
It is a figure which shows the state which put the other non-magnetic substrate and weight.

FIG. 5 is a view showing a state in which the surface of a substrate block having a groove filled with a non-magnetic substrate is planarly polished.

FIG. 6 is a perspective view showing a state in which an inner winding groove, an outer winding groove, and an auxiliary groove are formed in the substrate block.

7 is a perspective view showing a state in which the two substrate blocks formed in FIG. 6 are joined together.

FIG. 8 is an external perspective view of a conventional head chip.

FIG. 9 is a view in which a soft magnetic thin film is formed on the groove surface of a V-shaped groove of a conventional non-magnetic substrate.

10 is a diagram showing a state where a low melting point glass is filled in the V-shaped groove of the non-magnetic substrate shown in FIG.

FIG. 11 is a perspective view showing a state in which an inner winding groove and an outer winding groove are formed in the substrate block.

12 is a perspective view showing a state in which the two substrate blocks formed in FIG. 11 are joined.

[Explanation of symbols]

 1 head chip 2 soft magnetic thin film 3,4 non-magnetic substrate 3a substantially V-shaped groove 5,6,9 substrate block 7 low melting glass 8 weight 10 internal winding groove 11 external winding groove 12 auxiliary groove 13 gap surface 14 Non-magnetic gap material 15,16 Bar glass 17 Core block

Claims (2)

[Claims] 1. A step of forming a soft magnetic thin film on a groove surface of a substantially V-shaped groove formed on a surface of a non-magnetic substrate with a predetermined pitch dimension to form a first substrate block, and the first substrate block. A low-melting glass is arranged on a substrate block, and a non-magnetic substrate having substantially V-shaped grooves formed with the same pitch dimension as the predetermined pitch dimension is arranged thereon, and a load is applied to the low-melting glass. While melting, the two non-magnetic substrates are adhered to each other through the soft magnetic thin film to form a second substrate block; and a pair of the second substrate blocks are arranged so that their gap surfaces face each other. A step of joining to form a core block, and a step of cutting the core block at a predetermined pitch dimension to form a head chip, wherein the soft magnetic thin film forming a magnetic circuit is formed by the nonmagnetic substrates. So as to be sandwiched Method of manufacturing a magnetic head, characterized in that formed on the sliding surface and. 2. The method of manufacturing a magnetic head according to claim 1, wherein the soft magnetic thin film and the non-magnetic substrate are made of materials having hardnesses close to each other.