JPH0750005A - Magnetic head and manufacture thereof - Google Patents

Abstract

PURPOSE:To make it possible to manufacture a double-azimuth magnetic head used in a magnetic recording and reproducing apparatus readily so that the height of the track of a head is accurate. CONSTITUTION:Grooves 13 and 14 for trapezoidal winding windows, whose both ends are acute angles, are machined at the gap surface of a C core half body 10. The C core half body 10 and I core half 11 are bonded and a gapped bar 16 is formed. The gapped bar 16 can be made to be a double-azimuth magnetic head chip, wherein the heights of the head tracks H are equal and track widths Tw are also uniform, by the method, wherein an azimuth theta is formed at each track and a block 17 is sliced for each of winding windows 4 and 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head used in a magnetic recording / reproducing apparatus such as a video tape recorder (hereinafter referred to as VTR) and a method of manufacturing the same.

[0002]

2. Description of the Related Art In recent years, a magnetic recording / reproducing apparatus such as a VTR is required to have a high density recording, and accordingly, a magnetic head having a narrow track and a narrow gap is also required. In addition, since the recording method is compatible with the narrow track, a method called azimuth recording is used to reduce crosstalk between adjacent tracks.

In conventional home and business broadcast VTRs, special playback functions (slow, still, high-speed search, etc.) and YC separation recording have been put to practical use, and a plurality of recording / reproducing heads are required. It has become to.

Below is a description of the conventional single head base with two tips.
A magnetic head having a fixed number of head chips will be described.

As shown in FIG. 7, head chips 31, 3 are provided.
2 are individually manufactured and fixed to a head base 34 having a slit 33 formed therein. The head chips 31 and 32 have track widths of TW ₁ and TW ₂ , respectively, and are composed of ferrite head cores that form a head gap 35 and are joined with a mold glass 36. Normally,
Head chip 31 of size TW ₁ > size TW ₂ and size TW ₁ is a head chip 32 of size TW _{2 in} the standard recording mode.
Has been used for a long time recording mode.

The distance L between the head gaps 35 is regulated to a predetermined size by an adjusting device, the head chips 31 and 32 are adhered to each other, and the track positions H1 and H2 from the surface 37 where the head base 34 is attached to the cylinder are finally set. When adjusting to the right and left of the slit 33, the head base 3
4 is elastically deformed and adjusted. The head chips 31 and 32 have azimuths θ1 and θ2, respectively, and since the azimuths θ1 and θ2 are positive and negative, they are generally called double azimuth magnetic heads (see, for example, Japanese Patent Laid-Open No. Sho 6-62).
0-83212).

[0007]

However, in the above-mentioned conventional configuration, the head chips 31 and 32 are individually manufactured and fixed to the head base 34, and the head base 34 is elastically deformed, so that the track positions H1 of a plurality of head cores are formed.
There is a problem that it is very difficult to adjust + TW1 / 2 and H2 + TW2 / 2.

An object of the present invention is to solve the above-mentioned conventional problems, and an object thereof is to provide a magnetic head which is easy to manufacture and has a high track height accuracy, and a manufacturing method thereof.

[0009]

In order to achieve this object, a magnetic head and a method of manufacturing the same according to the present invention have a structure in which a head chip is provided with a trapezoidal winding window whose both ends are acute angles, and a C core half. Forming two or more trapezoidal-shaped grooves for winding windows with acute angles at both ends on the gap surface of the body, and joining the C core half body and the I core half body to form a gapd bar. A block that is cut by attaching azimuth to the track is cut for each winding window to form a head chip, and two or more double azimuth (positive azimuth and negative azimuth) magnetic heads with the same head track height are manufactured. This is a method of fixing those magnetic heads to the tip of one head base.

[0010]

In this configuration and method, since the track width is the same and the azimuth is attached by the gap bar, the track heights are positively aligned with the positive azimuth head chip and the negative azimuth head chip. This will improve the processing accuracy of the track height of the group.

[0011]

【Example】

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, head chips 1 and 2 are mounted on the tip of a head base 3. The head chips 1 and 2 are provided with trapezoidal winding windows 4 and 5 having acute angles at both ends,
It is composed of a head core made of a magnetic block such as ferrite or sendust which is formed by forming a head gap 6 having a track width dimension TW and is joined by a mold glass 7, and has a positive azimuth + θ and a negative azimuth − to the left and right of the head base 3. θ
The track position H from the reference surface 8 (which is almost equal to the side surface ends of the head chips 1 and 2) when the head base 3 is attached to the cylinder has the same dimension.

As described above, according to this embodiment, the distance from the side edge of each head chip to the center of the track width is between the head chip having positive azimuth and the head chip having negative azimuth. Since they are the same and have the same track width, a head core with a positive azimuth records a video signal, and a head core with a negative azimuth records an audio signal on the same tape track without off-track multi-frequency recording ( It is possible to perform deep recording on a magnetic tape), and it can be mounted on a magnetic recording / reproducing apparatus as a double azimuth magnetic head compatible with multi-channel recording and high transfer rate.

A method of manufacturing the magnetic head of this embodiment will be described below. As shown in FIG. 2A, the magnetic block 9 made of ferrite is cut into a C core half body 10 and an I core half body 11 as shown in FIG. The grooves 12 that regulate the track width dimension Tw are formed on the respective surfaces at the same pitch. Then, as shown in FIG. 2 (c), the C core half body 10 has two trapezoidal grooves 13 for winding windows, both ends of which are acute angles in the gap surface,
14 is formed. Since the two grooves 13 and 14 are trapezoidal with both acute angles, they can be processed with one kind of grinding wheel.

Then, as shown in FIG. 2 (d), C is set on the basis of the groove 12 for controlling the track width dimension Tw and the dimension Tw.
The core half body 10 and the I core half body 11 are formed with the gap between the glass and SiO ₂ to form the head gap 6,
Glass 7 for molding is poured into the groove 12 to form a gapped bar 16. At this time, track matching is confirmed from both sides of the outline arrow A and the outline arrow B.

Then, as shown in FIG. 2 (e), the gapped bar 16 is attached to the mold glass 7 at a position indicated by a chain line S1.
2 is sliced with azimuth θ, and then sliced into blocks 17 as shown in FIG.
2 is sliced as shown by the alternate long and short dash line S2 for each of the winding window grooves 13 and 14, and a head chip provided with trapezoidal winding windows 4 and 5 of both acute angles as shown in FIG. 1,
Set to 2. The head chips 1 and 2 viewed from the directions shown by white arrows C and D in FIG. 2 (f) can be seen from FIG. 2 (g) when the white arrows C and D are aligned upward. Makes it possible to obtain a double azimuth magnetic head chip in which the azimuths are + θ and −θ, the track height dimension H is the same, and the track width dimension Tw is uniform. This head chip 1,
2 is fixed to the head base to form a magnetic head in which two head chips 1 and 2 are fixed to the tip of a single head base.

As described above, according to the manufacturing method of this embodiment, two or more grooves 13 and 14 for the winding windows 4 and 5 are formed in the gap surface of the C core half body 10 in a trapezoidal shape with both ends having acute angles. do it,
The C core half body 10 and the I core half body 11 are joined to each other to form the gap bar 16 and the track is cut with azimuth. Then, the head chips 1, 2 are separated for each winding window 4, 5.
By the method of cutting, the magnetic head in which the azimuth is + θ and −θ, the track height dimension H is the same, and the track width dimension Tw is also uniform, the accuracy of the track height dimension H of the head chips 1 and 2 can be improved. As a result, there is no need to adjust the track height dimension by elastically deforming the head base as in the conventional case, and a magnetic head having excellent track pitch accuracy can be manufactured.

(Second Embodiment) A second embodiment of the present invention will be described below.

The feature of this embodiment is that, as shown in FIG. 3, in the structure of the first embodiment described above, a metal magnetic film 18 having a high saturation magnetic flux density is arranged near the head gap 6 of the head core. The point is that the head chips 19 and 20 of the in-gap (hereinafter referred to as MIG) type are used.

The method of manufacturing the magnetic head of this embodiment will be described below. FIG. 2A described in the first embodiment described above.
Although the steps up to (c) are the same steps, as shown in FIG. 4A, a soft magnetic thin film 18 having a high saturation magnetic flux density is formed on the gap surface after the track width is regulated to a predetermined thickness by a sputtering method. To form. In this embodiment, this soft magnetic thin film 18
Was made of Fe-Al-Si alloy. The head gap 6 is formed on the soft magnetic thin film 18 through the gap material 15 made of glass and SiO ₂ , and the mold glass 7 is poured into the track width regulating groove 12 to form the gap bar 16. At this time, track matching is confirmed from both sides of the outline arrow A and the outline arrow B.

Then, the gap bar 16 is sliced with the azimuth θ as shown by the chain line S1 in the same manner as in Example 1, and then the grooves 13 and 14 for the winding window are separately shown by the chain line S2. 4B, the head chips 19 and 20 are provided with trapezoidal winding windows 4 and 5 having both acute angles as shown in FIG. 4B. The head chips 19 and 20 viewed from the white arrow A and the white arrow B have azimuths of + θ and −θ, respectively, the track height H is the same, and the track width dimension Tw is also uniform. The magnetic head chip serves as the magnetic head as described in the first embodiment.

(Embodiment 3) A third embodiment of the present invention will be described below.

The feature of this embodiment is that, as shown in FIG. 5, a soft magnetic thin film 21 having a head gap 6 which is a non-magnetic material and serves as a main core is sandwiched between the structure of the first embodiment and the soft magnetic thin film 21. It is composed of laminated type head chips 24 and 25 which are composed of a laminated core 23 in which an insulating thin film 22 is arranged in a magnetic thin film 21. Reference numeral 26 in the figure is an adhesive layer for joining the main core composed of the soft magnetic thin film 21 and the insulating thin film 22 to the non-magnetic material.

A method of manufacturing the magnetic head of this embodiment will be described below. As shown in FIG. 6A, a soft magnetic thin film 21 and an insulating thin film 22 are alternately formed on a flat non-magnetic body 27 by a sputtering method to form a laminated core 23 serving as a main core, thus forming a substrate 28a. . Similarly, a plurality of substrates 28b and 28c on which the laminated core 23 is formed are manufactured. In this embodiment, the soft magnetic thin film 21 is made of an amorphous alloy containing Co as a main component, and the insulating thin film 22 is made of SiO ₂ . The surface of the laminated core 23 of the substrate 28a and the surface of the substrate 28b are adhered to each other by using the adhesive layer 26, and a plurality of substrates are also adhered in the same manner as shown in FIG. 29 is formed. In the figure, 30 is the soft magnetic thin film 2.
1 shows a united layer of the insulating thin film 22 and the adhesive layer 26.

Next, as shown in FIG. 6C, the multilayer block 29 is processed into a laminated C core half body 31 and a laminated I core half body 32, and the laminated body 14 is processed. On the gap surface of the C core half body 31, two grooves 13 and 14 for a winding window are formed in a trapezoidal shape with both ends having acute angles. By making the grooves 13 and 14 into a trapezoidal shape with both ends having an acute angle, it is possible to process with one kind of polishing grindstone. Here, the track width dimension Tw is the width dimension of the laminated core 23 formed by alternately arranging the soft magnetic thin films 21 and the insulating thin films 22.

Then, as shown in FIG. 6D, the laminated C core half body 31 and the laminated I core half body 32 are made of glass and S.
The head gap 6 is formed through the void material 15 made of iO _2, and the glass 33 for bonding is poured into the grooves 13 and 14 to form the gap bar 16. Then, in the same manner as in Example 1, the gapped bar 16 is sliced with azimuth θ as shown by the chain line S1 and then sliced as shown by the chain line S2 for each of the winding window grooves 13 and 14. Then, as shown in FIG.
4 and 25. The head chips 24 and 25 seen from the white arrow A and the white arrow B respectively have an azimuth of + θ.
And −θ, the track height H is the same, and the track width dimension Tw is uniform, which is a laminated type double azimuth magnetic head chip, which is the magnetic head as described in the first embodiment.

[0027]

As is apparent from the above description, according to the present invention, the head chip is provided with the trapezoidal type winding window whose both ends are acute, and the trapezoid whose both ends are acute in the gap surface of the C core half body. Form two or more grooves for winding windows of the mold, join the C core half body and the I core half body to form a gapped bar, cut with azimuth on the track, and head for each winding window By cutting the chip, creating two or more double azimuth magnetic heads with uniform head track height, and fixing these magnetic heads to the tip of one head base, manufacturing is easy and track height is high. It is possible to realize an excellent magnetic head with high accuracy and a manufacturing method thereof.

[Brief description of drawings]

1A is a schematic plan view of a magnetic head according to a first embodiment of the present invention, and FIG. 1B is a schematic front view of FIG.

FIG. 2 is a manufacturing process diagram of the magnetic head.

FIG. 3 is a schematic front view of a magnetic head according to a second embodiment of the present invention.

FIG. 4 is a manufacturing process diagram of the magnetic head.

FIG. 5 is a schematic front view of a magnetic head according to a third embodiment of the invention.

FIG. 6 is a manufacturing process diagram of the magnetic head

FIG. 7A is a schematic plan view of a conventional magnetic head, and FIG. 7B is a schematic front view of FIG.

[Explanation of symbols]

 1, 2, 19, 20, 24, 25 Head Chip 4, 5 Winding Window 6 Head Gap 9 Magnetic Block 10 C Core Half 11 I Core Half 13, 14 Groove 16 Gap Bar 18, 21 Soft Magnetic Thin Film 22 Insulating thin film

Claims (7)

[Claims] 1. A magnetic head comprising a bulk type head chip using a magnetic block such as ferrite or sendust, and having a trapezoidal winding window with sharp edges at both ends. 2. A metal-in-gap type head chip in which a main core is ferrite and a soft magnetic thin film having a high saturation magnetic flux density is provided in the vicinity of the head gap, has a trapezoidal type winding window whose both ends are acute angles. Magnetic head. 3. A magnetic head in which a laminated type head chip in which a soft magnetic thin film and an insulating thin film are laminated has a trapezoidal type winding window having acute angles at both ends. 4. The magnetic head according to claim 2, wherein the soft magnetic thin film is an alloy thin film containing Fe as a main component, an alloy thin film containing Co as a main component, or an alloy thin film containing Ni as a main component. . 5. A step of forming a C core half body and an I core half body from a magnetic block, and track width regulation is performed at the same pitch on the gap surface between the C core half body and the I core half body. A step of forming two or more trapezoidal grooves for winding windows in the gap surface of the C core half body with acute angles at both ends; and the C core half body with a non-magnetic material in the gap surface. A step of joining the I-core halves to form a gapd bar, a step of cutting the gapd bar with an azimuth on a track, and a step of cutting each groove for the winding window to form a parc type head chip. A method of manufacturing a magnetic head, comprising: 6. A step of forming a C core half body and an I core half body from a magnetic block, and track width regulation is performed at the same pitch on the gap surface between the C core half body and the I core half body. A step of forming at least two trapezoidal grooves for winding windows on the gap surface of the C core half body with acute angles at both ends; forming a thin film of a soft magnetic material on the gap surface; A step of joining the C core half body and the I core half body via a non-magnetic material formed on a thin film to form a gapd bar; a step of cutting the gapd bar with an azimuth on a track; A step of forming a methane-in-gap type head chip by cutting each groove for C winding window to form a magnetic head. 7. A step of forming a plurality of substrates having a laminated core as a main core by alternately forming soft magnetic thin films and insulating thin films on a flat non-magnetic material, and different from the surface of the laminated core of the substrate. Bonding the surface of the substrate to form an integral multi-layer block, forming the C core half and the I core half from the multi-layer block, and forming both ends on the gap surface of the C core half. Is a trapezoidal type having an acute angle, and is formed with two or more grooves for winding windows, and the above-mentioned C is formed on the gap surface via a non-magnetic material.
A step of joining the core half body and the I core half body to form a gapd bar; a step of cutting the gapd bar with an azimuth on a track; A method of manufacturing a magnetic head, comprising the step of forming a head chip.