JPH0579709U - MIG head - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] Make the width of the back butt portion thicker than the width of the butt portion of the track to reduce the deviation in the assembly process, reduce the magnetic resistance, and improve the reproduction efficiency. Improve. [Structure] A pair of core bodies 2 and 3 are made of ferrite, and back butting portions 2a and 3a and track butting portions 2b and 3b at a gap position are formed on the core bodies 2 and 3. When the width of the core bodies 2 and 3 is W, the back butting portion
The width dimensions of 2a and 3a are w ₂ formed by grooving the core material,
After that, diagonal track processing is performed so that the width dimension of the track butting portions 2b and 3b is w ₁ . That is, W> w ₂ > w ₁ and w ₂ is about 2 to 4 times w ₁ . Sendust film, amorphous film, and F are used for the butting portions 2a and 3a and the butting portions 2b and 3b.
An e-based alloy film and metal magnetic thin films 6 and 7 such as iron nitride are formed. The core bodies 2 and 3 were joined by welding the reinforcing glass 8 to the side faces of the butting portions 2b and 3b and the butting portions 2a and 3a.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a metal-in-gap head (hereinafter referred to as MIG head) in which a magnetic core used in a magnetic recording / reproducing apparatus is composed of a high-permeability ferrite core body and a metal magnetic film having a high saturation magnetic flux density near the gap.

[0002]

[Prior Art]

Conventional MIG heads, particularly in the case of parallel type MIG head, formed into a flat truck processing same width dimension mating surface 10 per the back core body 2 'and the mating surface 11 per track by w ₁ as shown in FIG. 8 It is getting narrower. Especially in the case of a narrow track, there is a drawback that the characteristics are likely to be deteriorated due to the displacement of the butting portion of the bag in the assembly process. Also, if the contact area is small, the magnetic resistance will be large and the reproduction efficiency will be poor, resulting in poor image quality and sound quality.

[0003]

[Problems to be solved by the device]

 The problem to be solved is that the width of the butting surface of the back is narrow, and there is a drawback that the characteristics are likely to deteriorate due to the displacement of the butting portion of the back, etc. Also, if the butting area is narrow, the magnetic resistance is large. That is, the reproduction efficiency is deteriorated and the image quality and sound quality are deteriorated. In view of the above-mentioned drawbacks, the object of the present invention is to make the width of the butting portion of the back thicker than the width of the butting portion of the track to reduce the deviation in the assembly process, reduce the magnetic resistance, and improve the reproduction efficiency. However, it is to propose a MIG head which can obtain sufficient recording / reproducing characteristics and image quality / sound quality.

[0004]

[Means for solving the problem]

 According to the present invention, in a MIG head having a main core made of ferrite and a metal magnetic thin film having a high saturation magnetic flux density or a high magnetic permeability in the vicinity of the gap, the abutting portion of a pair of core bodies is formed to have a width several times the track width. Is the gist.

[0005]

[Action]

Back Butt portion 2a, 3a is wide, when the width dimension of the core body 2 is _{W, W> w 2> w} 1 and made as back Butt portion 2a, the width of 3a w _2, When the width dimension of the track abutting portions 2b and 3b is set to w ₁ , the abutting area is widened, the deviation of abutting is reduced, the reproduction efficiency is increased, and the magnetic resistance is reduced.

[0006]

【Example】

 The present invention will be described below with reference to the illustrated embodiment. 1 is a perspective view of the MIG head, FIG. 2 is a side view of the MIG head, FIG. 3A is a sectional plan view taken along the line AA of FIG. 2, and FIG. 3B is a sectional plan view taken along the line BB of FIG. 4 is a front view of the butting portion of the core body, FIG. 5 is a perspective view of the one-side core body, and FIG. 6 is a perspective view showing a manufacturing process of the MIG head.

In the MIG head 1, a pair of core bodies 2 and 3 are formed of ferrite, and a winding window 4 and a gap 5 formed by joining the core bodies 2 and 3 are provided. The pair of core bodies 2 and 3 are formed with back contact portions 2a and 3a and track contact portions 2b and 3b at the gap 5 position. When the width dimension of the core bodies 2 and 3 is W as shown in FIGS. 3 and 4, the width dimension of the butting portions 2a and 3a of the back is w ₂ formed by grooving the core material, and then the track The width of the mating portions 2b and 3b is set to w _{1 so as} to be diagonally tracked. That, W> w _2> w ₁ in w ₂ is formed to a width dimension of about 2 to 4 times w _1. The width dimension w ₁ of the track abutting portions 2b and 3b is usually formed to be about 22 μm. Metal magnetic thin films 6 and 7 having a high saturation magnetic flux density or a high magnetic permeability are formed on the back contact portions 2a and 3a of the core bodies 2 and 3 and the track contact portions 2b and 3b. The core bodies 2 and 3 are joined by welding the reinforcing glass 8 to the side surfaces of the track butting portions 2b and 3b of the winding window 4 and the side surfaces of the butting portions 2a and 3a of the back. Recesses 2c and 3c are formed at the winding window 4 positions of the core bodies 2 and 3. Recesses 2d and 3d for coil winding are formed on both sides of the core bodies 2 and 3.

A gap material such as SiO ₂ is sandwiched in the gap 5.

The metal magnetic thin films 6 and 7 having a high saturation magnetic flux density or a high magnetic permeability are formed to have a thickness of, for example, 5 μm by sputtering of a sendust film, an amorphous film, a Fe-based alloy film, iron nitride or the like. .

The manufacturing process of the core bodies 2 and 3 is shown in FIG. 6, and the ferrite material is roughly processed into a plate-shaped core material block 9 as shown in FIG. Thereafter, the core material block 9 is mirror-finished as shown in (b). This makes it easier to measure the track width with a scanner when the track is processed later. Next, as shown in (c), a plurality of V-shaped or trapezoidal concave grooves 9a are formed in the core material block 9 by using a grindstone (not shown). By this processing, the back contact portions 2a, 3a of the core bodies 2, 3 are formed by the slopes 9b and the peaks 9c on both sides of the groove 9a. A recess 9d is formed on the lower surface of the core material block 9. The recesses 9d serve as recesses 2d and 3d for coil winding of the core bodies 2 and 3. In (d), a recess 9e is formed on the upper surface of the core material block 9 so as to be orthogonal to the groove 9a. The recesses 9e serve as recesses 2c and 3c at the winding window 4 positions of the core bodies 2 and 3. In (e), the track positions of the slopes 9b and the ridges 9c on both sides formed by the groove 9a are diagonally tracked to form slopes 9f and ridges 9g on both sides. The sloping surfaces 9f and the ridges 9g on both sides formed by this processing form the track abutting portions 2b and 3b, and this width provides a regular track width. When the processing of (e) is completed, the metal magnetic thin films 6 and 7 having high saturation magnetic flux density or high permeability are formed on the slopes 9b and peaks 9c on both sides and the slopes 9f and peaks 9g on both sides. In (f), the core material blocks 9 and 9'finished in (e) are laminated and glass-bonded so that the glass is filled in the groove 9a. The core material block 9'is of the same shape and symmetrical as the core material block 9 except that there is no unnecessary portion 9h. In (g), a tape sliding contact surface 9i is formed, and is sliced into chips at the slit dividing line a in (f). The slit dividing line a is the center position of the groove 9a having the trapezoidal concave shape. Further, the unnecessary portion 9h is cut to form the MIG head 1 shown in FIG. Further, the glass of the glass bonding left by the slice becomes the above-mentioned reinforcing glass 8.

When the pair of core bodies 2 and 3 are formed from the core material blocks 9 and 9 ′ as described above, the back butting portions 2 a and 3 a and the truck butting portion 2 b having the above-mentioned predetermined width dimension, It becomes the MIG head 1 having 3b.

When the back butting portions 2a and 3a are wide and the width dimensions of the core bodies 2 and 3 are W, the width dimensions of the back butting portions 2a and 3a are set so that W> w ₂ > w _1. When w ₂ and the width dimension of the track abutting portions 2b and 3b are w ₁ , the abutting area is widened, the abruptness in abutting is reduced, the reproduction efficiency is increased, and the magnetic resistance is reduced.

When the MIG head 1 is configured as described above, the width of the back contact portions 2a and 3a is made thicker than the width of the track contact portions 2b and 3b, so that the contact area is widened. MIG with less misalignment, increased reproduction efficiency, reduced magnetic resistance, and can be easily manufactured by extending the conventional MIG head, with sufficient recording / reproducing characteristics and improved image / sound quality. The head can be obtained, and it is extremely effective even in the case of narrow tracks.

FIG. 7 is a perspective view of one side core body of a modified example of the MIG head.

In the MIG head 1 of the modified example, the slopes on both sides of the track abutting portions 2b and 3b are formed as substantially flat planes. The slopes on both sides may be flat surfaces having steps as illustrated.

[0016]

[Effect of the device]

 Since the present invention is configured as described above, by making the width of the back butt portion thicker than the width of the butt portion of the track, the butt area becomes wider, so that the lag of the butt is reduced and the reproduction efficiency is reduced. It is possible to provide a MIG head that exhibits practically excellent effects such as increased magnetic field, reduced magnetic resistance, easy manufacture, and improved sufficient recording / reproducing characteristics and improved image quality / sound quality.

[Brief description of drawings]

FIG. 1 is a perspective view of a MIG head.

FIG. 2 is a side view of the MIG head.

3 (a) is a cross-sectional plan view taken along the line AA of FIG. 2 (b).
FIG. 3 is a sectional plan view taken along the line BB of FIG.

FIG. 4 is a front view of the butting portion of the core body.

FIG. 5 is a perspective view of a one-sided core body.

FIG. 6 is a perspective view showing a manufacturing process of the MIG head.

FIG. 7 is a perspective view of one side core body of a modified example of the MIG head.

FIG. 8 is a front view showing a butting portion of a core body of a conventional MIG head.

[Explanation of symbols]

 1 MIG head 2, 3 core bodies 2a, 3a Back butting part 2b, 3b Track butting part 6, 7 Metallic magnetic thin film 8 Reinforced glass

Claims (1)

[Scope of utility model registration request] 1. An MI comprising a main core made of ferrite and a metal magnetic thin film having a high saturation magnetic flux density or a high magnetic permeability near the gap.
In the G head, the abutting portion of the pair of core bodies is formed to have a width several times as large as the track width.