JPS6286511A - Magnetic head - Google Patents

Abstract

PURPOSE:To obtain a good electric conversion characteristic regardless of workiing accuracy by interposing a magnetic gap material between joint surfaces of cores, disposing a nonmagnetic material to both end faces thereof, joining the joint surfaces, working the same in such a manner that both intersect orthogonally with each other and further extending the magnetic metallic film to one outer side face of half cores. CONSTITUTION:Plural pieces of square grooves 31 are bored to ferrite 30 and the magnetic metallic film 32 is deposited thereon. A glass material is melted and packed into the grooves. The glass material is packed adjacently to the grooves 34 and the plane is polished by which a half core 36 is obtd. After winding grooves 37 are perforated to the core 36a, the film of the magnetic gap material is formed on one end face on the side to slide with a tape. The above-mentioned core is united to 36b by using an adhesive agent, then the base material for a magnetic head is completed. The base material is cut to form a head core chip. Variance exists merely in the length of the glass material in the sliding direction of the tape even if a working error exists in the depth direction of the square grooves 31, 34. The electrical conversion characteristic is substantially improved.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a magnetic head, and particularly to a magnetic head made of an oxide magnetic material.

<Conventional technology> Conventionally, in order to perform good recording and reproduction on magnetic recording media with high coercive force, magnetic metal films with high saturation magnetic flux density are coated on saponified magnetic materials with high magnetic permeability. A magnetic head having a core half has been proposed.

In this type of magnetic head, a configuration is known in which the boundary between the magnetic metal film and the hardened magnetic material is parallel to the gap at the sliding contact surface of the medium, but in this case, it acts as a pseudo gap and the characteristics deteriorate. Put it away.

On the other hand, a magnetic head having a core structure as shown in FIG. 5 has been proposed in Japanese Patent Publication No. 60-32107. In Fig. 5, la and lb are respectively oxide magnetic material parts such as ferrite, and 2a and 2b are respectively magnetic metals such as sendust, amorphous, permalloy, etc., formed by sputtering, vapor deposition, or other film forming methods on the oxide magnetic material parts. A magnetic metal film 3a, 3. b, 3c, and 3d are non-magnetic material parts such as glass, 4 is a winding window, and 5 is a magnetic gap.

In the magnetic head as shown in FIG. 5, the oxide magnetic material portion 1a
, lb and the magnetic metal films 2a and 2b are non-parallel to the magnetic gap, do not act as a pseudo gap, and have a shape in which both ends of the gap portion in the track radius direction are supported by highly wear-resistant ferrite. As a result, matching with media and running characteristics have also been improved.

<Problems to be Solved by the Invention> However, the magnetic head shown in FIG. 5 has manufacturing steps that require highly accurate processing techniques. Figure 6 (A)-(I)
5 is a diagram showing an example of the manufacturing process of the head shown in FIG. 5. FIG. Note that FIG. 6 shows the manufacturing process as viewed from one side, which will be the surface that will be in sliding contact with the medium after manufacturing.

First, as shown in FIG. 6(A), a large number of 7-shaped grooves 11 are formed in a ferrite block 10 at a predetermined pitch. Incidentally, the V-shaped grooves are formed using grinding wheels or the like arranged at equal pitches, but extremely high precision is required for the processing accuracy of the seven-shaped grooves 11. The reason for this will be explained below. Now, assume that a variation of about 10 gm has occurred with respect to the desired depth, as shown by lla in FIG. 6(A), for example. This error in the depth direction (indicated by If the angle formed is 45°, then x=y and y is also 1
It becomes 0pm.

From the state shown in FIG. 6(A), the ferrite block 10
A magnetic metal such as sendust [! 12 is deposited and formed.

(As shown in Figure 6 (B)) Next, this magnetic metal film is removed by surface polishing until the ferrite block portion is exposed, and then a high melting point glass or the like is placed in the V-shaped groove where the magnetic metal film is formed. Filling with non-magnetic material 13 (Fig. 6(C)
, the step shown in (D)).

Furthermore, between the above-mentioned 7-shaped grooves 11, a new 7-shaped groove 1 is similarly provided.
4 (as shown in FIG. 6(E)), this 7-shaped groove 14
The inside is also filled with non-magnetic material 15, and the surface is polished as shown in Fig. 6 (
A core half block 16 as shown in F) is obtained. A pair of such core half blocks 16 is prepared, and after processing a winding groove on one core half block, they are butt-joined via a magnetic gap material so that the magnetic metal films 12 face each other. (shown in FIG. 6(G)), then this butt block is cut along the dashed line 17, and the sixth
A magnetic held core chip having a medium sliding contact surface as shown in FIG. 3(H) is obtained.

However, if an error occurs in the depth of the 7-shaped groove 11, a magnetic held core chip as shown in FIG. 6(I) may be formed. That is, extremely precise processing technology is required to accurately manage the track width of the head.

The above example describes the case where a depth error occurs in the 7-shaped groove 11 in which the magnetic metal film 12 is formed, but of course, the depth error also occurs in the 7-shaped groove 14 in which the magnetic metal 15112 is not formed. Occur.

7(A) to 7(J) are diagrams showing other examples of the manufacturing process of the head shown in FIG. 5 in order to explain the influence thereof.

Components in FIGS. 7(A) to (J) that are similar to those in FIGS. 6(A) to (I) are given the same numbers.

First, as shown in FIG. 7(A), a 7-shaped groove 14 is formed in a ferrite block. 14a is a 7-shaped groove 14 in case a depth error occurs. These 7-shaped grooves 14 are filled with a non-magnetic material 15 such as high melting point glass (as shown in FIG. 7(B)), and 7-shaped grooves 11 are further formed between the 7-shaped grooves 14. After that, a magnetic metal 8912 is deposited and surface polishing is performed (FIGS. 7(C), (D), and (E)), and the 7-shaped groove 11 to which this magnetic metal film is deposited is also coated. A core half block as shown in FIG. 7(F) is obtained by melting and filling high melting point glass, and after butt joining as shown in FIG. 6(G), the core half block shown in FIG. 7(F) is obtained.
Cut along the dashed line 17 in G).

As a result, a head core chip as shown in FIG. 7(H) is obtained, but in this case also, if an error occurs in the depth of the figure-7 groove 14, the head core chip as shown in FIG. 7(I) or FIG. 7(J) is obtained. In the head having the core structure shown in FIG. 7(I), in which a head core chip as shown in FIG.
In addition, in a head with a core structure as shown in FIG. 7(J), the tip of the ferrite portion 1b (indicated by X in the figure) is located on the track, and this portion and the magnetic gap 5 Alternatively, the magnetic recording and reproducing characteristics may deteriorate due to magnetic flux leakage between the ferrite portion 1a and the other ferrite portion 1a.

As mentioned above, the conventional magnetic head shown in FIG. 5 requires extremely high precision machining.

In view of the above-mentioned problems, the present invention has developed a magnetic head that can perform extremely good recording and reproducing on a magnetic recording medium with high coercive force without requiring extremely high processing accuracy during manufacturing. The purpose is to provide

<Means for Solving the Problems> In view of the above-mentioned objectives, the magnetic head of the present invention has a magnetic head in which core halves each having a magnetic metal film deposited on an oxide magnetic material are arranged between the deposited surfaces. In the medium sliding contact surface of the magnetic head that is butted together with a gap material in between, a non-magnetic material is disposed in contact with both ends of the magnetic gap, and the area where the non-magnetic material is disposed is at least near both ends of the magnetic gap. A structure is adopted in which the magnetic metal film is substantially orthogonal to the magnetic gap and extends along one of the outer edges of the non-magnetic region in contact with one of the core halves.

<Function> By configuring as described above, the width of the non-magnetic region near the magnetic gap is always stable regardless of the processing accuracy during manufacturing. Furthermore, the area in which the magnetic metal film contacts the oxide magnetic material is extremely large, and magnetic flux flows smoothly from the oxide magnetic material to the magnetic metal film, so no magnetic flux leakage occurs that would adversely affect recording and reproducing characteristics. First, extremely good electromagnetic conversion characteristics can be obtained.

<Example> An embodiment of the present invention will be described below.

FIG. 1 is a perspective view of a magnetic head as an embodiment of the present invention, and FIGS. 2(A) to 2(G) are diagrams showing manufacturing steps of the magnetic head shown in FIG. 1.

In FIG. 1, 21a and 21b are oxide magnetic material parts such as ferrite, 22a and 22b are magnetic metal films such as sendust, and 23a, 23b, and 23c.

23d is a non-magnetic material portion, 24 is a winding window, and 25 is a magnetic gap.

In the magnetic head as described above, the oxide magnetic material portion 21a,
The contact area between magnetic metal film 21b and magnetic metal films 22a and 22b is extremely large. Accordingly, the flow of magnetic flux is extremely smooth and good electromagnetic conversion characteristics can be obtained. In addition, the magnetic metal film 22
The film thicknesses of a and 22b are unrelated to the track width, and since the film formation time can be shortened, the manufacturing time can also be shortened. Furthermore, as will be described later, the yield will be dramatically improved.

The manufacturing process of the head shown in FIG. 1 will be explained using FIGS. 2(A) to 2(G). First, the ferrite block 30 is cut and polished using a rotary grindstone or the like arranged at a predetermined pitch to form a square groove 31 having a square cross section as shown in FIG. 2(A). A magnetic metal film 32 is deposited on the formed ferrite block 30 by sputtering or the like (as shown in FIG. 2(B)).
, high melting point glass 33 is melted and filled into the rectangular groove 31 whose side and bottom surfaces are coated with magnetic metal 32 (second
(shown in Figure (C)).

Next, a rectangular groove 34 is similarly formed at a position shifted a certain distance from the groove 31 (as shown in FIG. 2(D)), and a non-magnetic material such as high melting point glass is melted and filled in this rectangular groove. A core half block 36 as shown in FIG. 2(E) is obtained by surface polishing. Next, a pair of core half blocks 36 are prepared, and a winding groove 37 as shown in FIG. 2(F) is formed in one of the core half blocks. , a magnetic gap material is formed to a predetermined thickness on the abutting surface on the medium sliding contact side. Then, the other core half blocks are butted together as shown in FIG. 2(G) and bonded using an adhesive such as low melting point glass. After that, A and N in Figure 2 (G)
This joint block is cut at the portion shown in Figure 1 to obtain a head core chip as shown in Figure 1.

Now, in the above manufacturing process, even if variations occur in the depth of the square grooves 31 or 34, in this case, the non-magnetic material portion 23a in FIG.

This only causes variations in the lengths of 23b, 23c, and 23d in the medium sliding direction 27, and does not have any adverse effect on the characteristics of the head.

Also, at this time, the magnetic metal films 22a, 22b and the ferrite portion 2
The boundaries between 1a and 21b are parallel to the magnetic gap, but in this case, the contact area between the magnetic metal films 22a and 22b and the ferrite parts 21a and 21b is extremely wide, so these boundaries act as a pseudo gap. No significant leakage flux occurs, and the electromagnetic conversion characteristics are not substantially affected.

3 and 4 are views of a magnetic head as another embodiment of the present invention, viewed from the surface in contact with the medium, and the same components as in FIG. 1 are given the same numbers. The heads are non-magnetic parts 23a, 23b, and 23c.

The width of the head 23d on the opposite side from the magnetic gap 25 is made to be continuously narrow, so that the magnetic flux flows more smoothly than the head shown in FIG. 1, and the electromagnetic conversion characteristics are improved. The head in Fig. 3 is shown in Fig. 2 (A) and Fig. 2 (
It can be manufactured by forming the bottom surfaces of the square +431 and the square groove 34 into a V-shape in step D).

The head shown in FIG. 4 has the extending portions of the magnetic metal films 22a and 22b on the same side, and in FIG. 2(G), the core half block 36a.

This is obtained by making the rectangular grooves 31 covered with the magnetic metal film 36b face each other.

FIG. 8 is a perspective view showing a magnetic head as still another embodiment of the present invention, in which the same components as in FIG. 1 are given the same numbers, and FIGS. 9(A) to (F) are 9 is a diagram showing a manufacturing process of the head shown in FIG. 8. FIG.

The head shown in FIG. 8 has a V-shape at a pitch of about 57 pm at a portion parallel to the magnetic gap 25 at the boundary between the magnetic metal films 22a, 22b and the ferrite portion 21b of the head shown in FIG. be.

This further reduces the adverse effect that this boundary has on the electromagnetic conversion characteristics.

As shown in FIG. 9(A), the manufacturing process shown in FIGS. 9(A) to 9(F) is as shown in FIG. 9(A).
Except for forming the 7-shaped groove 39 of about the pitch, the second
This is the same as the manufacturing process shown in FIGS. (A) to (G), and detailed explanation will be omitted. However, the step of filling the rectangle yI34 with the nonmagnetic material 35 is performed after the winding groove 37 and the magnetic gap material 38 are formed.

FIG. 10 is a perspective view showing the structure of a magnetic head as still another embodiment of the present invention, and the same components as in FIG. 1 are given the same numbers and their explanations are omitted. The head shown in FIG. 8 is a magnetic metal @ 22 a of the head shown in FIG.
, 22b and the ferrite portion 21b, the portion parallel to the magnetic gap is made non-parallel. Needless to say, this is due to the same reason as the head shown in FIG.

FIGS. 11(A) to 11(L) are diagrams showing the manufacturing process of the magnetic head of FIG. 10. This manufacturing process will be explained below. Ferrite block 3 as shown in FIG. 11(A)
First, triangular grooves 40 are formed at predetermined intervals for zero. Next, a rectangular groove 31a is formed over the shallow part of the triangular groove 40, and a magnetic metal film 32 is deposited from the hill thereof (FIG. 11(B).
).

(C)), a non-magnetic material 33 is melted and filled into these grooves, and the groove-forming surfaces are flat-polished.

(As shown in FIGS. 11(D) and (E)) After that, a rectangular groove 34a extending over the deep part of the triangular groove is formed, and a non-magnetic material is melted and filled into this groove, and one core heart block 36c (
11(L)) is obtained.

On the other hand, as shown in Figures 11 (G) to (K), this time the first
First, a rectangular groove 31b is formed in the deep part of the triangular groove 40 as shown in FIG. The other core half block 36d is obtained by forming the rectangular groove 34b and filling it with a non-magnetic material. In this core half block 16d, a winding groove 37 is formed immediately before filling the rectangular groove 34b with a non-magnetic material, and a magnetic gap material 38 is provided with a predetermined thickness.

These core half blocks 160 and lad
By butting them together as shown in Figure (L) and cutting along A and N, a magnetic helad core chip as shown in Figure 10 is obtained.This head also has magnetic metal films 22a, 22b and a ferrite portion 21a.

The influence of the boundary portion with 21b on the electromagnetic conversion characteristics can be further reduced. Of course, like the head shown in FIG. 1, the yield is extremely good.

12 to 17 show modified examples of the magnetic head shown in FIG. 10, in which a core half block is shown as 36c in FIG. 11(L), and a core half block is shown as 36d in FIG. 11(L), respectively. It is manufactured in combination.

Note that the shape of the non-magnetic portion is not limited to that of the above-described embodiment, but as long as it is approximately perpendicular to the shape near the magnetic gap, the above-described effect of improving the yield can be obtained.

<Effects of the Invention> As explained above, the magnetic head of the present invention can achieve extremely good magnetic recording and reproduction even for magnetic recording media with high coercive force, and can achieve excellent magnetic recording and reproduction without significantly improving the precision during manufacturing. It can be manufactured.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a magnetic head as an embodiment of the present invention. 2A to 2G are diagrams showing the manufacturing process of the magnetic head shown in FIG. FIG. 5 is a perspective view showing a conventional magnetic head as seen from the side. 6(A) to 6(I) are diagrams showing an example of the manufacturing process of the magnetic head shown in FIG. 5. FIG. 7(A) to (J) are views showing other examples of the manufacturing process of the magnetic head shown in FIG. 5; FIG. 8 is a perspective view showing a magnetic head as still another embodiment of the present invention; FIG. 9(A) to (F) are views showing an example of the manufacturing process of the magnetic head shown in FIG. 8; FIG. 10 is a perspective view showing a magnetic head as still another embodiment of the present invention; FIGS. 10A to 10L are diagrams showing an example of the manufacturing process of the magnetic head shown in FIG. 10. 12 to 17 are views showing modifications of the magnetic head shown in FIG. 10, respectively. In the figure, 21a and 21b are parts made of oxide magnetic material, respectively;
22a and 22b are respectively made of magnetic metal films; 23a;
, 23b, 23c, and 23d are each made of a nonmagnetic material, 24 is a winding window, and 25 is a magnetic gap portion. Figure 6 (6) Figure 6 (H) Stomach Figure 6 (1) Jaw (/ [8 (C) 〒qQ (D) Muscle 11 mouth (E) Muscle 110 (F) Growth

Claims (2)

[Claims] (1) A magnetic head in which two core halves made of a magnetic metal film coated on an oxide magnetic material are butted together with a magnetic gap material placed between the coated surfaces, and the surface where the medium slides , a non-magnetic material is disposed in contact with each end of the magnetic gap, and a region in which the non-magnetic material is disposed is substantially perpendicular to the magnetic gap at least near both ends of the magnetic gap, and the magnetic metal A magnetic head characterized in that a film extends along one of the outer edges of the non-magnetic region in contact with one of the core halves. (2) Claim (1) characterized in that the width of the non-magnetic region in the track width direction is constant near the magnetic gap, and has a portion where the region width changes continuously. The magnetic head described in Section 1.