JPH03222108A - Magnetic head and production thereof - Google Patents

Abstract

PURPOSE:To produce the magnetic head which suppresses the war of a magnetic gap part, has good workability and eliminates the possibility of sepn. by forming films consisting of a material having a high hardness and wear resistance on the inside surface of the track width regulating grooves of the magnetic head. CONSTITUTION:The magnetic gap 21 is formed in the joint part of 1st, 2nd magnetic core half bodies 11a, 11b and the surfaces of the track width regulating groove parts 15 formed on the right and left of this magnetic gap are coated with the films 16 consisting of the material having the high hardness and the wear resistance, for example, diamond, amorphous diamond, oxide ceramics, etc. The wear of the magnetic gap part is eventually suppressed by these films 16. After the track width regulating groove parts 16 of the blocks 11a, 11b are coated with the films 16, molding glass 17 is molded and joined in the track width regulating grooves 15 and, therefore, the heating after the joining is obviated. The possibility that the joined parts are separated by heat is thereby eliminated.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applied to a digital audio recorder (R-D
The present invention relates to a magnetic head suitable for use in AT), video tape recorders (VTR), and a method of manufacturing the same.

[Prior art] Digital audio recorder (R-DAT),
In video tape recorders (VTRs) and the like, information is recorded and reproduced on a magnetic tape by a magnetic head.

This magnetic head wears out when used for a long time.

Therefore, conventionally, for example, as shown in FIG. 6, a magnetic head l is made by joining two magnetic core halves 1b and 1c.
A film 2 made of an abrasion-resistant material is coated on the tape sliding surface 1a, which the magnetic tape comes into contact with, to suppress abrasion.

[Problems to be Solved by the Invention] However, in the conventional magnetic head, the magnetic core half 1b
, lc are bonded and the tape sliding surface 1a is coated with the film 2, which not only results in poor workability but also causes the bonded magnetic core halves 1 to deteriorate due to the temperature rise during film formation.
There was a risk that b*1c would separate.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a magnetic head that is easy to work with and is free from separation, and a method for manufacturing the same.

[Means for Solving the Problems] The magnetic head of the present invention has first and second magnetic heads that are joined to each other.
a magnetic gap portion formed at the joint between the first magnetic core half body and the second magnetic core half body; track width regulating groove portions formed on the left and right sides of the magnetic gap portion; A film made of a highly hard and wear-resistant material t↓ coated on the surface of the width regulating groove, and a molded part in which a predetermined molding material is molded into the track width regulating groove on which the film is formed. Features.

A method of manufacturing a magnetic head of the present invention includes the steps of forming a track width regulating groove in a block made of a predetermined magnetic material;
After that, the method further comprises a step of coating the track width regulating groove with a film made of a highly hard and wear-resistant material.

[Operation] In the magnetic head configured as described above, the track width regulating grooves on the left and right sides of the magnetic gap portion are coated with a film made of a highly hard and wear-resistant material.

Therefore, wear is suppressed.

Further, in the method for manufacturing a magnetic head having the above configuration, the track width regulating groove of the block is coated with a film made of a highly hard and wear-resistant material, and then mold glass is molded within the track width regulating groove. It is further joined. Therefore, there is no possibility that the bonded portion will separate due to heat.

[Embodiment] FIG. 2 shows the steps of an embodiment of the method for manufacturing an MIG (metal-in-gap) type magnetic head of the present invention.

First, a rectangular block 11 made of, for example, a ferrite magnetic material is prepared, and two outer winding grooves 12 are formed on the surface opposite to the abutting surface (FIG. 2(a), (
b)). Next, a large number of grooves 13 having a substantially V-shaped cross section are formed perpendicularly to the outer winding groove 12 on the abutment surface on the opposite side of the block 11, and on the grooves 13, for example, Sendust, 2
A ferromagnetic metal thin film 14 made of titanium oxide (TiO=+) and chromium (Cr) is formed by vapor deposition, sputtering, etc.
They are formed sequentially (FIGS. 2(C) and (d)).

Next, a track width regulating groove 15 having a substantially U-shaped cross section is formed again on the groove 13 in which the elastic magnetic metal thin film 14 was formed.
On top of that, a film 16 made of a material with high hardness, good abrasion resistance, and a small movable property coefficient is formed to a predetermined thickness (for example, S to 10 μm) by vapor deposition, sputtering, etc. Figure 2(e)). Examples of the material for this film 16 include diamond, amorphous diamond (i-carbon), oxide ceramics (SiOz, AlzO+, TiO2,
ZrOz alone or a composite, etc.), non-oxide ceramic shorts (SiC, 5iJa, Mo5z, C-BN, etc.), etc. can be used.

FIG. 3 shows the track width regulating groove 1 formed in the block 11.
5 schematically shows a state in which a film 16 is formed.

A molding material 17 made of glass or the like is molded into the track width regulating groove 15, and a part of the abutting surface of the block 11 on which this molding material 17 is molded is provided with windings in parallel with the outer winding groove 12. Line groove 18 is formed (second
Figures (f), (g)).

Block 1 with mold shrine 17 molded in this way
1 has two magnetic core half blocks ll at its approximate center.
It is divided into a, llb (Fig. 2 (h)). A divided magnetic core half block 11a.

11b, the abutting surfaces on which the mold material 17 was formed are lapped and mirror-finished (FIG. 2(i)).

Next, a nonmagnetic film 19 is formed on the magnetic core half block 11a (or 11b) to form a magnetic gap (FIG. 2(j)). As this film 19, for example, 5i
n2 can be used.

Two divided magnetic core half blocks 11a.

11b is a jig 41.42 after the ferromagnetic metal thin film 14 portions are positioned and butted so as to diagonally oppose each other.
The magnetic core half blocks 11a,
llb are joined to form a magnetic core block 20 (FIGS. 2(k) and (1)).

After that, the left and right end surfaces of the magnetic core half blocks lla and llb are wrapped, and the two magnetic core half blocks lla and llb are wrapped.
, llb are aligned in length (Fig. 2 (rn)).

Roughly speaking, the magnetic core block 2o is attached to a jig 43, and the sliding surface lie of the magnetic tape is processed into a curved surface (FIG. 2(n)). Thereafter, a plurality of grooves 31 are formed to form individual magnetic heads, and the bottom surfaces thereof are cut along line C (FIGS. 2(o) and (p)).

In this way, individual magnetic core bodies having magnetic gaps 21 are formed (FIG. 2(q)).

FIG. 1 shows an enlarged front view of one magnetic core body formed in this manner. As shown in the figure, track width regulating grooves 15 are formed on the left and right sides of the magnetic gap 21, and a film 16 is coated on the surface thereof. A molding material 17 is then molded onto the film 16. In this way, since the film 16 made of a highly hard material is formed near the magnetic gap 21, wear of the magnetic head can be suppressed.

Next, the manufacturing process of the bulk type magnetic head will be explained below using FIG. 4.

First, as shown in FIG. 4(a), a rectangular block 50 made of ferrite magnetic material or sendust magnetic material is prepared, and then the block 5o is wound on the surface opposite to the abutting surface 51 along the longitudinal direction of the block 5o. Machining the wire outer groove 52. next,
As shown in FIG. 5B, a block 50a has a pair of winding outer grooves 52 processed.

50b, and these blocks 50a, 50b
The winding groove 53 is formed on the abutting surface 51a of one of the blocks 50a, and the abutting surface 51b of the other block 50b is formed.
A mold groove 54 is formed in.

Next, as shown in FIG. 5C, a track width regulating groove 55a communicates with the winding groove 53 formed in one block 50a.
A plurality of track width regulating grooves 55b are formed at predetermined intervals, and track width regulating grooves 55b similar to those of one block are also formed on the abutment surface 51b of the other block 50b.

Next, as shown in FIG.
In the track congestion regulation 1i55a, 55b of b, Example 1
Similarly, for example, diamond, amorphous diamond (i carbon),
Oxide ceramic 7, (SiOz, AhO3, Ti0
, Zr02), non-oxide ceramics (S iC* Si 3 N 4+ Mo
The film 56a is made of a material with high hardness, good abrasiveness, and a small coefficient of dynamic friction, such as S z + C-B N, etc.)
is formed to a predetermined thickness (for example, 5 to 10 μm) by vapor deposition, sputtering, etc., and one block 5
0a and t: 5 on the front mating surface 51c of the winding groove 53.
A nonmagnetic film 56b is formed from i(h, etc.) to have the thickness of the magnetic gap.

Next, as shown in FIG. 5(e), the pair of blocks 50
a and 50b are abutted so that the track width regulating grooves 55 a + 55 b face each other in just the right amount, and then fixed using a jig (not shown) or the like, and a first molded glass is inserted into the winding groove 53 and the mold groove 54, respectively. 57 and second molded glass 58 are melted and filled to obtain a magnetic core block 59. At this time, the first molded glass 57 is melted and flows into the track width regulating grooves 55a and 55b communicating with the winding groove 53 and is filled therein.

Next, as shown in FIG. 6(f), the core block 59 is attached to a jig 60, and the tip is polished using this jig as a base, thereby defining the life dimension t, and adjusting the magnetic gap 62 and the track. A track radius S defined by the distance between the width regulating grooves 55a and 55b is exposed on the tape sliding surface 61. Next, as shown in FIG. 5G, the core block 59 is sliced along the cutting line 63 passing through the track width regulating grooves 55a and 55b, and cut into a plurality of magnetic core bodies 64 having predetermined dimensions and shapes. However, rather than cutting it off completely, it is sliced so that a portion of the rear surface 65 remains.

Next, as shown in FIG. 6(h), the tape sliding surface 61 is wrapped with a wrapping tape 66.

Next, as shown in Figure (i), by slicing the rear surface 65, a magnetic core body 64 shown in Figure (J) can be obtained.

FIG. 5 shows a magnetic core body 64 formed in this way.
This is an enlarged view of the tape sliding surface.

As shown in the figure, a film 56a is coated on the inner surfaces of the track width regulating grooves 55a and 55b on the left and right sides of the magnetic gap 62 to suppress wear of the magnetic head.

[Effects of the Invention] As described above, according to the magnetic head of the present invention, a film made of a highly hard and wear-resistant material is formed on the inner surface of the track width regulating groove of the magnetic head. Wear of the gap portion can be suppressed.

Further, according to the method of manufacturing a magnetic head of the present invention, the blocks are bonded after forming a film made of a highly hard and wear-resistant material in the track width regulating grooves.
After joining, there is no heating and there is no risk of the joined base being separated.

[Brief explanation of drawings]

FIG. 1 is a front view showing the structure of an embodiment of the magnetic head of the present invention, and FIGS. 2(a) to (q) and 3 show steps of an embodiment of the method of manufacturing the magnetic head of the present invention. A diagram explaining
4(a) to 4(j) are diagrams illustrating the steps of another embodiment of the method for manufacturing a magnetic head of the present invention, and FIG. 5 shows the structure of the magnetic head manufactured by the steps shown in FIG. 4. Front view,
FIG. 6 is a perspective view showing the structure of an example of a conventional magnetic head. 1... Magnetic head, 2.16... Film, 11,50,
50a, 50b...Block, lla, llb.
...Magnetic core half block, 12.52...Outer groove for winding, 14...Ferromagnetic metal thin film, 15. 55a, 55
b...Track width regulation groove, 17...Mold material, 1
8.53...Winding groove, 19. 56b°゛Nonmagnetic film,
20.59...Magnetic core block, 21°62...
Magnetic gap, 57.58...Mold glass, 61
...Magnetic tape sliding surface.

Claims (2)

[Claims] (1) first and second magnetic core halves that are joined to each other; a magnetic gap formed at the joint between the first magnetic core half and the second magnetic core half; Track width regulating grooves formed on the left and right sides of the gap portion, a film made of a highly hard and wear-resistant material coated on the surface of the track width regulating groove, and the track width regulating groove on which the film is formed. 1. A magnetic head, comprising: a mold portion in which a predetermined mold material is molded. (2) A step of forming a track width regulating groove in a block made of a predetermined magnetic material, and then a step of coating the track width regulating groove with a film made of a highly hard and wear-resistant material. A method of manufacturing a magnetic head, characterized in that: