JPH06150226A - Manufacture of magnetic head and magnetic head - Google Patents

Abstract

PURPOSE:To provide a highly reliable magnetic head having an azimuth only at a magnetic gap part and not breaking the coating of a winding. CONSTITUTION:In the manufacture of a magnetic head with an azimuth angle, an inclined face 2 of the same inclining angle theta as the azimuth angle to be added to a magnetic gap is formed beforehand in a magnetic core substrate 1. The substrates 1 are bonded each other into one body and then cut.

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 a magnetic head mounted on a video tape recorder or the like.

[0002]

2. Description of the Related Art Conventionally, azimuth has been applied to the magnetic gap of a magnetic head as follows.
First, a pair of magnetic core substrates 10 made of ferrite or the like.
Track width regulation groove 1 at a predetermined pitch for each of 1 and 102
03, 104 are formed.

Next, the track width regulating grooves 103, 10 are formed.
A winding groove and a glass groove are formed in a direction orthogonal to 4. Next, the track width regulating grooves 103 and 104 are aligned with each other, and the pair of magnetic core substrates 101 and 102 are joined and integrated by a fused glass 105.

Next, the joint block 106 is shown in FIG.
Tilt by the azimuth angle θ as shown in. Next, the above-mentioned joining block 106 is slid at the position of line aa 'and line bb' in FIG. As a result, the magnetic head 110 in which the closed magnetic circuit unit is formed by the pair of magnetic cores 108 and 109 is manufactured. In the magnetic head 110, as shown in FIGS. 20 and 21, the azimuth angle θ is given to the magnetic gap g that operates as a recording / reproducing gap.

[0005]

However, in the above-mentioned method, as shown in FIG. 22, not only the magnetic gap portion but also the chip side surface 110 in the traveling direction of the magnetic recording medium is shown.
a, 110b and end faces 111a of the winding grooves 111, 112,
Even 112a has an azimuth angle.

Therefore, when windings are wound around the winding grooves 111 and 112, the end faces 11 of the winding grooves 111 and 112 are wound.
The coating of the winding may be destroyed by the sharp edges of the windings 1a and 112a, which may cause winding leakage failure.
Further, the work of setting the joining block 106 by inclining it by the azimuth angle θ requires skill and the workability is extremely poor to be performed by a person, and a large-scale dedicated device is required for automation.

Therefore, the present invention has been proposed in view of such conventional technical circumstances, and has a highly reliable magnetic head which has azimuth only in the magnetic gap portion and does not damage the coating of the winding. It is an object of the present invention to provide a method of manufacturing a magnetic head capable of providing the above. A further object of the present invention is to provide a highly productive magnetic head in which the positional relationship between a pair of magnetic gaps having different azimuth angles is highly accurate and which has excellent contact characteristics with a magnetic recording medium.

[0008]

In order to achieve the above object, the present invention provides a method of manufacturing a magnetic head having an azimuth angle, in which the tilt angle is the same as the azimuth angle previously given to the magnetic gap. It is characterized in that the magnetic core substrates having the surfaces are joined and integrated and then cut.

Further, according to the present invention, a pair of magnetic heads, which are formed by joining and integrating magnetic core substrates having an inclined surface having the same inclination angle as the azimuth angle given to the magnetic gap in advance and then cutting The magnetic gaps have different azimuth angles, and the magnetic gaps are arranged adjacent to each other in the traveling direction of the magnetic recording medium.

Further, the present invention is characterized in that, in the above magnetic head, a part of the magnetic cores of each closed magnetic circuit portion forming the pair of magnetic gaps is made common and integrated.

[0011]

When the magnetic head of the present invention is manufactured, the magnetic core substrates having the inclined surfaces having the same inclination angle as the azimuth angle given to the magnetic gap are joined and then cut. It is not necessary to incline the magnetic core substrates that have been converted to each other by the azimuth angle and slicing with a rotating grindstone, and the azimuth angle can be easily given only to the magnetic gap portion. Therefore, the azimuth angle is not given to the chip side surface of the magnetic head or the winding groove, and even when the winding is wound, the coating of the winding is not broken and leaks do not occur.

Further, in the magnetic head of the present invention, since a part of the magnetic cores of each closed magnetic circuit portion forming a pair of magnetic gaps is made common and integrated, the positional relationship of these magnetic gaps is high. It will be accurate.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments to which the present invention is applied will be described in detail below with reference to the drawings. Example 1 To manufacture a magnetic head, first, as shown in FIG.
A magnetic core substrate 1 made of ferrite having a flat rectangular shape is prepared.

Next, an inclined surface 2 which is a magnetic gap forming surface having the same inclination angle θ as the azimuth angle given to the magnetic gap of the magnetic head formed on the main surface 1a of the magnetic core substrate 1 is formed. A plurality of heads are formed at a predetermined pitch according to the number of heads.

To form the inclined surface 2, for example, EL
An ID (electrolytic in-process dressing) grinding method is used. Such a grinding method is a method of electrolyzing a grinding wheel and a work, and is advantageous in that it is possible to prevent clogging of the grinding wheel and to make the ground surface a mirror finish. In this example, cast iron fiber bond CBN grindstones # 6000 and # 10000 were used as the grinding grindstones and were formed by an angled jig or a processing machine with an angle variable table.

As a result, the inclined surface 2 is a mirror-finished surface that does not require polishing.

Next, a track width regulating groove 3 for regulating the track width of the magnetic gap is formed. As shown in FIG. 2, the track width regulating groove 3 is a groove having a substantially U-shaped cross section so that each inclined surface 2 remains so as to have a track width dimension Tw and extends in the forming direction of the inclined surface 2. To form. At this time, the angles θ ₁ and θ ₂ formed by the line orthogonal to the one main surface 1a of the magnetic core substrate 1 and the both side surfaces 3a and 3b of the track width regulating groove 3 are such that the influence of crosstalk and leakage is small. Set to a different angle.

Next, as shown in FIG. 3, a winding groove 4 for winding the winding in a direction orthogonal to the track width regulating groove 3 and a glass groove for joining and integrating the magnetic core substrates 1 with each other. 5
To form. Each of the winding groove 4 and the glass groove 5 is formed as a groove having a substantially U-shaped cross section at two positions at a predetermined pitch in a direction orthogonal to the track width regulating groove 3.

Next, after cutting the magnetic core substrate 1 into blocks, the above-mentioned steps are sequentially repeated to manufacture a similar magnetic core substrate 6. Then, as shown in FIG. 4, the pair of magnetic core substrates 1 and 6 are abutted while forming the gap film while aligning the tracks, and bonded and integrated by the fused glass 7.

In order to secure the bonding strength between the magnetic core substrates 1 and 6 as the fused glass 7 at this time, for example, a high melting point glass having a fusion temperature of about 750 ° C. is used.

Next, the surface 8c of the joint block 8 which has been joined and integrated to be the contact surface with the magnetic recording medium is cylindrically polished and further subjected to contact width processing. Then, the joining block 8 is
As shown in FIG. 5, the opposing surfaces 8a and 8b opposite to the surface on which the track width regulating groove 3 is formed are arranged so as to be orthogonal to the horizontal plane.

Then, the joint block 8 is attached to the rotary grindstone 9
Slicing is performed at the positions of line A-A 'and line B-B' in FIG. As a result, as shown in FIGS. 6 and 7, the magnetic head 12 in which the pair of magnetic cores 10 and 11 constitutes the closed magnetic circuit portion is completed.

In the magnetic head 12, only the magnetic gap portion has azimuth, and the chip side surfaces 12a and 12b in the running direction of the magnetic recording medium and the end surface 4 of the winding groove 4 are formed.
As shown in FIG. 8, both a and 4b are perpendicular to the running direction of the magnetic recording medium. Therefore, the winding groove 4
When the winding is wound around the wire, an accident such that the coating of the winding is broken and a winding leak occurs does not occur. The winding leakage defect occurrence rate of the magnetic head manufactured by the conventional method is 13
% (Data with 50 heads),
In this example, it was 0%. Further, according to the present embodiment,
Since it is not necessary to incline the joining block 8 and perform slicing, slicing can be easily performed without using a dedicated jig or a processing machine. Furthermore, the manufacturing process can be simplified and the man-hours can be significantly reduced by omitting the gap surface lapping process.

In the above process, the pair of magnetic core substrates 1 and 6 are joined together by the fused glass 7.
A film made of u may be formed, and the magnetic core substrates 1 and 6 may be joined and integrated by low temperature thermal diffusion joining of Au. In addition, since the winding grooves and the glass grooves may be formed in either one of the magnetic core substrates 1 and 6 that are joined and integrated, the winding grooves and the glass grooves are formed in one of the magnetic core substrates 6. May be omitted.

Further, in the above-mentioned example, the closed magnetic circuit portion is constituted by only ferrite, but the closed magnetic circuit portion may be constituted by ferrite and the metal magnetic thin film. For example, after the track width regulating groove 3 is formed, a metal magnetic thin film is formed on the inclined surface 2 which will be a magnetic gap forming surface, and thereafter, the same process is performed. In this way, a metal-in-gap type magnetic head in which the metal magnetic thin film is arranged near the magnetic gap is manufactured. In addition,
As such a metal magnetic thin film material, for example, Fe-Al-
Si-based alloy, Fe-Ga-Si-based crystal material, Fe-N
Series, Fe-C series microcrystalline material, Co-Zr series, Co-Nb
System amorphous materials and the like.

Example 2 In order to manufacture a magnetic head according to this example, first, as shown in FIG. 9, a magnetic head to be manufactured is formed on one main surface 13a of a magnetic core substrate 13 made of ferrite having a rectangular plane shape. A plurality of inclined surfaces 14 serving as magnetic gap forming surfaces having the same inclination angle θ ₃ as the azimuth angle given to _one magnetic gap g ₁ are formed at a predetermined pitch according to the number of heads to be manufactured.

The inclined surface 14 is manufactured in the same manner by using the ELID grinding method as in the first embodiment.
As a result, the inclined surface 14 becomes a mirror-finished surface to the extent that polishing is unnecessary.

Next, a track width regulating groove 15 for regulating the track width of the magnetic gap is formed. As shown in FIG. 10, the track width regulating groove 15 is a groove having a substantially U-shaped cross section so that each inclined surface 14 remains so as to have the track width dimension Tw _1, and is formed in the direction in which the inclined surface 14 is formed. Form over. At this time, a line orthogonal to the one main surface 13 a of the magnetic core substrate 13 and both side surfaces 1 of the track width regulating groove 15
The angles θ ₄ and θ ₅ formed with 5a and 15b are set to angles that are less affected by crosstalk and leak.

Next, as shown in FIG. 11, a winding groove 16 for winding a winding in a direction perpendicular to the track width regulating groove 15 and a glass groove for joining and integrating the magnetic core substrates 13 with each other. Form 17. These winding groove 16 and glass groove 1
No. 7 is a groove having a substantially U-shaped cross section, and is formed at two positions at a predetermined pitch in a direction orthogonal to the track width regulating groove 15.

Next, after cutting the magnetic core substrate 13 into blocks, the above steps are sequentially repeated to manufacture a similar magnetic core substrate 18. The magnetic core substrate 18
The winding groove and the glass groove are not formed in. Then, as shown in FIG. 12, the pair of magnetic core substrates 13 and 18 are abutted while forming a gap film while aligning the tracks, and are bonded and integrated by a fused glass 19.

At this time, in order to secure the bonding strength between the magnetic core substrates 13 and 18, the fused glass 19 is, for example, a high melting point glass having a fused temperature of about 750 ° C.

Next, the joining block 20 joined and integrated is formed.
A magnetic gap forming surface having a tilt angle θ ₆ which is opposite to the tilt direction of the tilt surface 14 and has the same tilt angle θ ₆ as the azimuth angle given to the other magnetic gap of the magnetic head to be manufactured. A plurality of inclined surfaces 21 are formed at a predetermined pitch according to the number of heads to be manufactured. When forming the inclined surface 21, the ELID grinding method is also used in the same manner.

Next, a track width regulating groove 22 for regulating the track width of the magnetic gap g ₂ is formed. As shown in FIG. 13, the track width regulation groove 22 is formed on each inclined surface 21.
Is formed so as to remain so as to have the track width dimension Tw ₂ as a groove having a substantially U-shaped cross section along the formation direction of the inclined surface 21. At this time, the angles θ ₇ and θ ₈ formed by the line orthogonal to the one main surface 20a of the joining block 20 and the both side surfaces 22a and 22b of the track width regulating groove 22 are such that crosstalk and leakage are small. Set to angle. When the track width regulating groove 22 is formed, the pair of magnetic gaps g ₁ and g ₂ to be manufactured are formed so as to be displaced from the track width regulating groove 15 so that the track positions have a predetermined step difference between tracks. To do.

Next, the steps of FIGS. 9 to 11 are sequentially repeated to produce the magnetic core substrate 23 having the same inclination angle θ ₆ as the inclination angle θ ₆ of the inclined surface 21 formed on the one main surface 20a of the joining block 20. . And this magnetic core substrate 2
As shown in FIG. 14, after forming the gap film, the bonding block 3 and the bonding block 3 are abutted with each other while aligning the tracks, and are bonded and integrated by the fused glass 24.

At this time, the fusion glass 24 has a fusion temperature of 55 in order to prevent the fusion glass 19 formed by joining the already integrated magnetic core substrates 13 and 18 from melting.
A low melting point glass of about 0 ° C. is used.

Next, these three magnetic core substrates 13, 1
A surface 25c of the laminated block 25, in which 8 and 23 are laminated and integrated, which is a surface for contacting with the magnetic recording medium, is cylindrically polished, and further subjected to contact width processing. Next, the laminated block 25 is attached to the track width regulating groove 1 as shown in FIG. 5 of the first embodiment.
Opposing surfaces 25a, 25 opposite to the surface on which 5, 22 are formed
Arrange so that b is orthogonal to the horizontal plane.

Then, the laminated block 25 is slid by a rotary grindstone. As a result, as shown in FIGS. 15 and 16, the first magnetic core 26 is sandwiched between the first magnetic core 27 and the magnetic cores 27 on both sides of the magnetic core 26, and the first magnetic core 27 has a magnetic gap g ₁ with an azimuth angle θ _3. Magnetic circuit unit 28, central magnetic core 26 and other magnetic core 2
Magnetic gap g ₂ with azimuth angle θ _{6 of} 9
And a second closed magnetic circuit section 30 having

In the magnetic head manufactured as described above, since the two closed magnetic circuit portions 28 and 30 are integrally formed with the central magnetic core 26 being common, the magnetic gaps g ₁ and g _{2 of} each other. The positional relationship between tracks is extremely accurate. Therefore, it is possible to omit the troublesome work such as separately manufacturing the magnetic heads and pasting the magnetic heads with a predetermined step difference between the tracks on the head base with high precision, and to prevent the magnetic heads from being separated in the gaps between the magnetic heads. There is no possibility that the powder will be clogged and the contact property with the medium will be deteriorated. Therefore, in the magnetic head of this embodiment, as shown in FIG. 16, the track positional relationship between the magnetic gaps g ₁ and g ₂ is determined with high accuracy simply by mounting the magnetic head on the head base 31. .

Also in this embodiment, the low temperature thermal diffusion bonding using Au may be used to bond the magnetic core substrates 13, 18, 23 to each other. Further, a winding groove and a glass groove may be formed on both surfaces of the magnetic core substrate 18 at the center of the laminated block 25. Also in this embodiment, the metal magnetic thin film may be arranged near the magnetic gap.

Furthermore, in the magnetic head of the above-mentioned embodiment, the first closed magnetic circuit section 28 and the second closed magnetic circuit section 30.
In consideration of the crosstalk between the first closed magnetic circuit portion 28 and the second closed magnetic circuit portion 28, as shown in FIGS. 17 and 18, the nonmagnetic film 32 is interposed between the common central magnetic cores 26.
The closed magnetic circuit unit 30 may be magnetically divided. To manufacture such a head, the magnetic core substrate 18 in which the non-magnetic film 32 is sandwiched in advance is used in the process of FIG.

[0041]

As is apparent from the above description, in the method of manufacturing a magnetic head according to the present invention, a magnetic core substrate having an inclined surface formed in advance with the same azimuth angle as the azimuth angle given to the magnetic gap. Since they are cut after joining and integrating them, it is possible to omit the troublesome work of tilting and cutting the joining block when cutting to the head chip, and it is possible to give azimuth only to the gap part. Therefore, it is possible to avoid the occurrence of winding leakage when the winding is wound around the winding groove.

Further, in the magnetic head of the present invention, since a part of the magnetic cores of each closed magnetic circuit section forming a pair of magnetic gaps having different azimuth angles are made common and integrated, these magnetic fields are integrated. The track positional relationship of the gap becomes highly accurate, the attachment work to the head base becomes extremely easy, and the contact property with respect to the medium is significantly improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing a step of sequentially manufacturing a magnetic head of Example 1 and showing a magnetic gap forming surface processing step.

FIG. 2 is a perspective view showing a step of sequentially manufacturing the magnetic head of Example 1 and showing a track width regulating groove processing step.

FIG. 3 is a perspective view showing a step of sequentially manufacturing the magnetic head of Example 1 and showing a winding groove and glass groove processing step.

FIG. 4 is a perspective view showing a step of sequentially manufacturing the magnetic head of Example 1 and showing a magnetic core substrate bonding step.

FIG. 5 is a side view showing a step of sequentially manufacturing the magnetic head of Example 1 and showing a slicing processing step.

FIG. 6 is a plan view of the magnetic head according to the first embodiment.

FIG. 7 is a side view of the magnetic head of the first embodiment.

8 is a cross-sectional view of the magnetic head of Example 1 taken along the line CC in FIG.

FIG. 9 is a perspective view showing a step of sequentially manufacturing the magnetic head of Example 2 and showing a magnetic gap forming surface processing step.

FIG. 10 is a perspective view showing a step of sequentially manufacturing the magnetic head of Example 2 and showing a track width regulating groove processing step.

FIG. 11 is a perspective view showing a step of sequentially manufacturing the magnetic head of Example 2 and showing a step of forming a winding groove and a glass groove.

FIG. 12 is a perspective view showing a step of sequentially manufacturing the magnetic head of Example 2 and a magnetic core substrate bonding step.

FIG. 13 is a perspective view showing a step of sequentially manufacturing the magnetic head of Example 2 and showing a magnetic gap forming surface processing step.

FIG. 14 is a perspective view showing a step of sequentially manufacturing the magnetic head of Example 2 and showing a magnetic core substrate bonding step.

FIG. 15 is a plan view of a magnetic head according to a second embodiment.

FIG. 16 is a side view of the magnetic head according to the second embodiment.

FIG. 17 is a plan view showing another example of the magnetic head of the second embodiment.

FIG. 18 is a side view showing another example of the magnetic head of the second embodiment.

FIG. 19 is a diagram showing an example of applying azimuth by a conventional method.

FIG. 20 is a plan view of a magnetic head manufactured by a conventional method.

FIG. 21 is a side view of a magnetic head manufactured by a conventional method.

22 is a cross-sectional view of the magnetic head manufactured by the conventional method taken along the line DD in FIG.

[Explanation of symbols]

 1, 6, 13, 18, 23 ... Magnetic core substrate 2, 14, 21 ... Inclined surface 3, 15, 23 ... Track width regulating groove 10, 11, 26, 27, 29 ... Magnetic core

Claims (3)

[Claims] 1. In a method of manufacturing a magnetic head having an azimuth angle, magnetic core substrates having an inclined surface having the same inclination angle as the azimuth angle given to a magnetic gap in advance are bonded and integrated and then cut. A method of manufacturing a magnetic head, comprising: 2. A magnetic head formed by joining and integrating magnetic core substrates, each having an inclined surface having the same inclination angle as the azimuth angle given to the magnetic gap in advance, and then cutting the magnetic core substrates. A magnetic head having an azimuth angle, and these magnetic gaps are arranged adjacent to each other in the traveling direction of the magnetic recording medium. 3. The magnetic head according to claim 2, wherein a part of the magnetic cores of each closed magnetic circuit portion forming the pair of magnetic gaps is made common and integrated.