JPS62239406A - Magnetic head - Google Patents

Abstract

PURPOSE:To form a gap depth shallowly and highly precisely by forming a thin film consisting of a high-permeability magnetic material on a slope part and forming the face, which is exposed to a magnetic gap, of the thin film in parallel with the depth direction of the magnetic gap. CONSTITUTION:A magnetic thin film layer 5' is formed on a slope 1a and is joined by a glass material 4', and a slide face 10 is smoothed by wrapping or the like to form a magnetic head. In this case, C=d-Bcostheta/costheta is satisfied where theta is the angle formed between the slope 1a and a line X1-X1' and B is the length of the face exposed to the slide face 10 of the slope 1a after polishing the magnetic thin film layer 5' up to the line X1-X1' and the depth of a gap wall 2 after polishing of the magnetic thin film layer 5' up to the line X1-X1' and (d) is the thickness of the magnetic thin film layer 5' on the slope 1a. The depth is accurately calculated in accordance with this formula to form the shallow depth with high precision.

Description

[Detailed Description of the Invention] j gx [IEI /71 i# tm fy
iH110 [Industrial Application Field] The present invention relates to a high-density recording magnetic head used in, for example, VTRs, FPs, RDs, and the like.

[Conventional technology]

High-density recording magnetic heads used in VTRs, FPs, RDs, etc. have a 6ft air gap as narrow as possible to improve recording density, and use Hi-Bs material, a high permeability magnetic material, as the magnetic material. , it is necessary to make the magnetic depth 10 μm or less.

As a conventional fjA head for achieving such high density recording, there is a magnetic head shown in FIGS. 4(a') to 4(d), for example. FIG. 4(a) is a perspective view showing the external appearance of these conventional magnetic heads, particularly a magnetic head tip. This magnetic head has an inverted C-shaped first magnetic core 1 and a single-shaped second The remagnetic core has opposing surfaces joined to each other, and a magnetic gap 3 is formed at one end of the joined portion. The surface of the magnetic head on which the gap 3 is formed forms a sliding surface 10 that faces and slides into contact with a magnetic recording medium (not shown).

An opening 1b for winding is formed inside the first magnetic core facing the second magnetic core 2, and one side of the opening 1b adjacent to the sliding surface 10 and continuous with the gear knob 3 is a sliding opening 1b. The contact surface 10 is inclined at a predetermined angle (a slope 1a is formed).

A glass material 4 for bonding is provided in the valley portion 11 and the gap 3 where the inclined surface 1a and the second magnetic core 2 intersect and are connected to the gap 3. It is joined. Further, a glass material is similarly provided between the first magnetic core 1 and the second magnetic core 2 on the opposite side of the valley portion 11 to join the two magnetic cores.

FIG. 4(b) shows the gap 3 of the magnetic head in FIG. 4(a).
FIG. 2 is a cross-sectional view showing in detail an example of a structure in the vicinity of. In the conventional magnetic head shown in FIG. 4(b), the gap 3 and the valley 11 between the first magnetic core 1 and the second magnetic core 2 are made of glass material 4, Hi-Bs material, etc. A magnetic layer 5 is formed of a high permeability magnetic material, the glass material 4 is formed adjacent to the first magnetic core 1 side and spreads out in a fan shape in the trough 11, and the magnetic layer 5 is formed adjacent to the first magnetic core 1 side. It is formed adjacent to the second side. The head formed in this way is ground to the line X1-Xi' in FIG. 4(b), so that a sliding surface 10 is formed.

Further, FIG. 4(c) is a sectional view showing in detail another example of the structure in the vicinity of the gap 3 of the magnetic head of FIG. 4(a). In the conventional magnetic head shown in FIG. 4(C), a glass material 4 and a magnetic layer 5 are provided in the gear, the groove 3, and the trough 11 between the first magnetic core 1 and the second magnetic core 2. The structure formed is the same as that shown in FIG. 4(b), but the glass material 4 is formed adjacent to the second magnetic core 2 side and spreads out in a fan shape in the trough 11, and the magnetic layer 5 is They are oppositely formed in that they are formed adjacent to the first magnetic core 1 side. The Eil head thus formed is also polished to the line X1-Xi' to form the sliding surface 10.

Similarly, FIG. 4(d) is a sectional view showing in detail still another example of the structure in the vicinity of the gap 3 of the magnetic head of FIG. 4(a). In the conventional magnetic head shown in FIG. 4(d), a glass material 4 is sandwiched between the gap 3 and the trough 11 between the first magnetic core 1 and the second magnetic core 2 to provide high magnetic permeability on both sides. A magnetic layer 5 made of a magnetic material is formed.

The magnetic head thus formed is also polished to the line X1-XI' to form the sliding contact surface 10.

[Problem that the invention seeks to solve]

In the conventional magnetic head shown in FIG. 4(b) or FIG. 4(C), the effective Dave's of the gap 3 becomes deep, and if it is made shallow, saturation occurs in the magnetic layer 5 and recording characteristics deteriorate. There is a problem.

Furthermore, in the conventional magnetic head shown in FIG. 4(d), the effective dibs of the gap 3 are similarly deep, and when this is made shallow, the angle of the connection between the inclined surface 1a and the gap 3 becomes rounded. , there is a problem that the gap widens.

-) fi +111 Kohinizushi I medium μ Tonko Kaiwa 6 Zanyu π
Death 1: To: z,,.

It is an object of the present invention to provide a magnetic head in which the depths are formed shallowly and with high accuracy, thereby realizing even higher density recording and reproduction.

[Means for solving problems]

Solve the above problems. Therefore, the magnetic head of the present invention has
A magnetic gap is formed at one end of a joint in which a pair of magnetic cores are joined facing each other, and an opening is formed in one magnetic core from the joint to face the other magnetic core. A magnetic head, wherein one side of the opening that is continuous with the gap forms an inclined part that is inclined at a predetermined angle with respect to the depth direction of the magnetic gap, the magnetic head having a high permeability magnetic material on the inclined part. A thin film made of a material is formed, and a surface of the thin film exposed to the magnetic gap is formed parallel to the depth direction of the magnetic gap.

[Effect]

In the magnetic head of the present invention, a thin film made of a high magnetic permeability magnetic material is formed on the inclined portion of the magnetic head formed by joining a pair of magnetic cores, and the surface of the thin film exposed to the magnetic gear is formed in the magnetic gap. It is formed parallel to the depth direction.

〔Example〕

Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 1 is a sectional view showing details of a magnetic gap of a magnetic head according to an embodiment of the present invention. The overall chip structure of the magnetic head is the same as that shown in FIG. 4(a), and only the structure in the magnetic gap 3 is different.

In addition, in the configuration shown in FIG. 4, the first magnetic core l, the second
magnetic core 2, inclined surface 1a, opening 1b, gear 3,
The structures of the sliding surface 10, valley portions 11, etc. are the same in the magnetic head shown in FIG. 1, and therefore are given the same reference numerals.

In FIG. 1, the gap 3 and trough 11 between the first magnetic core 1 and the second magnetic core 2 are made of glass material 4' and H1-3s material made of a high magnetic permeability magnetic material. A magnetic thin film layer 5' is formed.
' is formed only on the inclined surface 1a and the side bottom IC of the opening 1b, and is formed inside the gap 3 where the first magnetic core 1 and the second magnetic core 2 face each other in parallel. It has not been. Moreover, in the part where the open I part 1b and the gap 3 intersect, the magnetic thin film layer 5' formed on the inclined surface la is such that the first magnetic core 1 is flat against the second magnetic core 2 (
A gap wall 12 is formed facing the second magnetic core 2 parallel to the width direction of the gap 3 so as to form the same surface as the surface exposed to the gear tooth 3. forms part of. The remaining portions of the gap 3 and the valley portion 11 are filled with a glass material 4'.

In detail, the glass material 4' is filled with high melting point glass between the parallel opposing parts of the side walls of the remagnetic core 1゜2, and low melting point glass is used in the valleys 11. There is.

In the magnetic head formed as described above, the magnetic head is polished from the sliding contact surface 10 side to the position shown by line XI-XI' in FIG. 1 to complete a magnetic hent chip. By polishing in this manner, the gap wall 12 approaches the sliding contact surface 0, and the gap 3 is formed only by the facing portion of the second magnetic core 2 and the gap wall 12. As a result, the depth of the gap 3 is defined by the gear tooth wall I2, and as will be explained below, the depth can be formed small and with high precision.

That is, as described above, the magnetic thin film layer 5' is formed on the inclined surface 1a.
After forming and bonding with a glass material 4', the sliding surface 10 is smoothed by lapping or the like to form a magnetic head. In this case, as shown in FIG.
The angle formed by the line X1-XI' is θ, and the magnetic thin film layer 5
The length of the exposed surface when the inclined surface 1a is exposed to the sliding contact surface 10 when ' is polished to the line Xl-X1' is B, and the magnetic thin film layer 5' is polished to the line XI-XI'. When the depth of the gap wall 12 at the time, that is, the depth, is the thickness at the slope 1a of the thin film layer 5', the following equation holds true.

d X l / co sθ=E3X t a r1
θ+C Therefore, the depth C is as follows.

C=dxl/cosθ-3xtanθ=dxl/coSθ-Bxsinθ/
cos θ=(d-[3cos θ)/cos
θ As seen from this formula, the depth can be accurately calculated from the length B of the exposed surface of the magnetic thin film layer 5′, the angle θ, and the thickness d of the magnetic thin film layer 5′, and small depths can be calculated with precision. As a result, the gap becomes less saturated and the recording characteristics become better.

2(a) to 2(e) are perspective views showing each step of manufacturing the magnetic head shown in FIG. 1, particularly the magnetic Fjl film layer 5'.

In this magnetic head, first, as shown in FIG. 2(a), core blocks 21 and 22 are formed for forming the first magnetic core 1 and the second magnetic core 2, respectively. Then, as shown in FIG. 2(b), one core block 2 is
forming a winding groove 21a corresponding to the opening lb in 1;
After polishing the opposing surfaces of the core blocks 21 and 22, high melting point glass 23 is deposited on the opposing surfaces of the core block 22 to a thickness equal to the gap width by, for example, sputtering, ion blating, CVD, vapor deposition, etc. .

Next, as shown in FIG. 2(C), the winding of the core block 21? Hi-Bs on the opposite surface on the side where n21a is formed.
material, i.e. Ni-Fe alloy (usually permalloy), Fe
- High permeability magnetic materials such as Al-Si alloys and amorphous alloys are processed by sputtering, ion blating, CV
The magnetic thin film layer 5' is deposited in the form of a film using the D method or the like.
form.

This magnetic thin film layer 5' may be formed only on the inclined surface la as shown in FIG. 2(d), but since it is difficult to form it only on the inclined surface la, figure(
After forming the magnetic thin film layer 5' on the entire surface as shown in FIG. Form. Finally, as described above, after attaching the magnetic thin film layer 5' to the core block 21 and attaching the high melting point glass 23 to the core block 22, both core blocks 21. 22 and the inclined surface 1a and the second
A low melting point glass is arranged in the valley 11 between the magnetic core 2 and the core block 21.2, and the glass is melted in a furnace to form both core blocks 21.2.
Join 2. After bonding, each time the chips are cut to a predetermined width, as shown in FIG. 2(f), an IF head chip is completed. The magnetic head is completed by incorporating this magnetic head chip into, for example, a slider or attaching it to a mounting plate, and polishing the sliding surface 10 that contacts the magnetic recording medium.

FIG. 3 is a sectional view showing essential parts of a magnetic head according to another embodiment of the present invention. This magnetic head differs from the magnetic head shown in FIG. 1 only in that LPr thin film layers 5' and 5' are provided on both sides of the glass material 4', and corresponds to the magnetic head shown in FIG. 4(d). It is something to do. In this magnetic head as well, gap walls 12 are similarly formed by the magnetic thin film layer 5' formed on the inclined surface 1a, and the gap depth is small and formed with high precision.

〔Effect of the invention〕

As explained above, according to the present invention, a thin film made of a high magnetic permeability magnetic material is formed on the inclined portion of a magnetic head formed by joining a pair of magnetic cores, and the surface of the thin film exposed to the magnetic gap is formed. are formed parallel to the depth direction of the magnetic gear, so that the dips can be measured on the exposed surface in the gap of the thin film, so the depths can be formed shallowly and accurately, improving recording density and recording characteristics. can be improved.

[Brief explanation of drawings]

FIG. 1 is a partially enlarged cross-sectional view of a magnetic head according to an embodiment of the present invention, FIGS. 2(a) to (f) are diagrams showing the manufacturing process of a tenth magnetic head, and FIG. A sectional view of a magnetic head according to another embodiment. FIG. 4 is a diagram showing a conventional magnetic head. In the figure, ■...first magnetic core, 1a...inclined surface, ■b...opening, 2...second magnetic core, 3...gap, 4'. ...Glass material, 5'...Magnetic thin film layer, 10...Sliding surface, 12...Gap wall. Figure 2 (c) Figure 2 (d) Figure 2 (f) Figure 3 Figure 4 (a) (c) (d)

Claims (2)

[Claims] (1) A magnetic gap is formed at one end of a joint where a pair of magnetic cores are joined facing each other, and an opening is formed in one of the magnetic cores from the joint to face the other magnetic core. , in a magnetic head in which one side of the opening continuous with the magnetic gap forms an inclined part inclined at a predetermined angle with respect to the depth direction of the magnetic gap, a high permeability magnetic material is provided on the inclined part; 1. A magnetic head, comprising: forming a thin film, and forming a surface of the thin film exposed to the magnetic gap parallel to the depth direction of the magnetic gap. (2) The high permeability magnetic material is Ni-Fe alloy, Fe-A
The magnetic head according to claim 1, characterized in that the magnetic head is made of one selected from l-Si alloy and amorphous alloy.