JPH04172607A - Magnetic head - Google Patents

Abstract

PURPOSE:To prevent generation of cracks at an end of the bottom of a notched groove due to the processing stress and the strain of a metallic magnetic film by forming the metallic magnetic body at the confronting face of a magnetic core with an inclination of predetermined angles to the confronting face in the thicknesswise direction. CONSTITUTION:Magnetic metallic films 1a, 1b of a high saturation magnetic flux density of, for example, Sendust or an amorphous magnetic alloy or the like are formed at the confronting faces of magnetic cores 2a, 2b facing each other with a magnetic gap 5 therebetween. The magnetic metallic films 1a, 1b are inclined at predetermined angles in the thicknesswise direction to the confronting faces of the magnetic cores 2a, 2b. In other words, ferrite core materials 2a, 2b cut from a ferrite block are processed to form notched bottomed grooves 2c, 2d. At this time, an inclining angle of an inclined side is made large. Accordingly, the stress is prevented from concentrating on the bottomed notched grooves 2c, 2d, thereby preventing generation of cracks.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic head for a rotary magnetic recording device, and particularly to a magnetic head suitable for performing high-density recording and reproduction with a high coercive force medium.

[Conventional technology]

In recent years, in order to realize higher density recording in recording devices, magnetic heads have been proposed that use high coercive force media and use a magnetic metal material with high saturation magnetic flux density in the magnetic helad core.

An example of such a composite magnetic head for a VTR is the 4th type magnetic head.
A magnetic head called a TSS structure (chilled sentust sputter structure) having the dimensions shown in FIG. 5 and FIG. 5 is known.

Figures 6(a) to (f)
A manufacturing process diagram of the S#4 magnetic head is shown. Figure 6(a)
Cut out the ferrite block from the ferrite block as shown in Figure 6 (b) (20a, 20b). Processing is performed. A metal magnetic film (10a, 10b) having a higher saturation magnetic flux density than the ferrite material is deposited on the entire abutting surface by sputtering (FIG. 6(C)). metal magnetic film fl
oa, 10b) Sendust is generally widely used in Lt TSS IFt construction.

After forming the magnetic film, the abutting surfaces of the magnetic film are formed by lapping as shown in FIG. 6(C). After that, Fig. 6(d) and (
As shown in e), there are grooves (6a) regulating the track width (6).
), and then fill glass in this standard 1lllIf (6al and the winding hole (4), and grind the fly 1 rite material (20a) that will become the C core and the ferrite material (20b) that will become the I core).
) with a magnetic gap (
5) made of a non-magnetic material, for example.
Spack 2. Next, i = +A and the ferrite material (20al and the ferrite material that will become the C core<20b) are matched with the track width, and then heated and processed while the ferrite material (20a) that will become the I core and the C core The ferrite material (20b) is bonded and bonded (generally referred to as glass bonding) with glass filled in the winding hole (4) and the track width regulating groove (6a) (FIG. 6(e)). - Paused] 7 material is sliced into a predetermined width to create a magnetic head with a TSS structure (FIG. 6(f)).

[Problems to be Solved by the Invention] However, in the conventional method of manufacturing a magnetic head made of TSSI, the ferrite core material (20a)
(20b) Notch 'a (2
1a) (21b) are V-shaped, processing stress during grinding is concentrated at the bottom tip of notch m (21a021b). In addition, when forming spatters of gold 11 films (1a) (1b), at the bottom of the notch grooves (21aH21b), the shadowed portions (21aH21b) themselves shade the sputtered metal magnetic film (11aH21b). The density of 1b) becomes coarse, and stress changes occur during heating and pressing in glass bonding in the subsequent process.As a result, the notch fills (21a)
(21b) There are problems in that the bottom part is likely to crack, causing a crash when the magnetic head is completed, and creating a false gap during mounting and use, causing noise. In addition, the track width 6 dimension is removed by polishing the metal magnetic material (10a) (10b3) sputtered on the notch grooves (21a) (21b), so there is a problem that it depends on the accuracy of the polishing rate. .

In the above problem, is it possible to improve the accuracy of the track width 6 dimension by increasing the notch full angle (21a021b) and reducing the increased part of the track width 6 dimension with respect to grinding*i? In order to realize this, it is necessary to increase the thickness of the metal magnetic film in order to maintain the same track width dimension. metal! When the magnetic films 10a and 10b become thicker, the head performance deteriorates due to an increase in eddy current loss during mounting and repopulation and a change in m* due to an increase in distortion of the sputtered gold-magnetic-bamboo film. Further, an increase in r of the metal magnetic film causes an increase in cracks at the bottoms of the notch grooves (21a) and (21b).

Therefore, in order to improve the dimensional accuracy of the track width 6 in the TSS II magnetic head, the notch groove (21aH
21b) Increase the angle and sharpen! i! Reducing the amount of increase in the track width 6 dimension relative to the amount cannot be a means to solve the problem.

The purpose of the present invention is to prevent cracks at the bottom tip of the notch groove (21al (21bl) due to processing stress and distortion of the metal magnetic film,
The objective is to improve the dimensional accuracy of the track width without increasing the thickness of the metal magnetic film.

[Failure to solve the problem]

The present invention provides a magnetic head in which a metal magnetic material having a high saturation magnetic flux density is formed on an opposing surface of a magnetic core to form a magnetic circuit through a magnetic gap, wherein the metal magnetic material is formed on an opposing surface of the magnetic core. The magnetic head is characterized in that the thickness of the magnetic core is inclined at a predetermined angle with respect to the opposing surface of the magnetic core.

[Effect]

The above technical means are used as follows.

In the present invention, the notch bay is made into an H base, and by preventing stress from concentrating on the notch at the base, it is possible to prevent the occurrence of cracks. The explanation will be based on.

FIG. 1 is a perspective view showing an embodiment of a magnetic head manufactured by the manufacturing method of the present invention. Figure 2 is the same as Figure 1.
The front view of the magnetic head shown in FIG. 3, and FIGS. 3(a) to ((+), also show T-bacilli showing one embodiment of the processing process of the present invention.

Further, in each figure, the same parts and parts as in the conventional drawings are given the same reference numerals.

In the figure, (1a) and (1b) are metal magnetic materials, (2a)
is one core of the magnetic head, (2b) is the C core of the magnetic head, and this C core (2b) is formed with a winding volume. (
3) is glass for bonding and reinforcing, and (5) is, for example, SiO
A magnetic gap made of a non-magnetic material such as 2, (6) is a track width formed by (2C) (21) regulating the track width. As shown in FIG. 1 and FIG. 2, the structure of the magnetic head of the present invention is as follows. e-M-SL Magnetic metal film (1a) (1b) with high saturation magnetic flux density made of gold alloy or amorphous magnetic alloy, etc.
) is formed, and this magnetic metal III (1a) (1b)
are formed with a thickness inclined at a predetermined angle with respect to the opposing surfaces of the magnetic cores (2a) and (2b).

Next, the seven methods for manufacturing the above magnetic head are shown in FIG.
).

As shown in Fig. 3(a) and Fig. 3(b), the ferrite core material (2a) cut out from the ferrite block (
2b), the angle of the inclined side is made larger on the side of the notch groove, and the notch 'l1g (2c) (2d
form l. For example, for an 8am++ VTR head, the angle is set to 80° to avoid picking up crosstalk from adjacent tracks. Thereafter, track processing is performed by grinding with a shaping whetstone (FIGS. 3(C) and (d)). The track width (6) is sputtered metal magnetic! i! (Since it becomes wider by 1aH1b1, it should be narrower than the track width (6) to be formed (Figure 3 cd)) For example, in the case of a 5JIII ν R head, the track width (61 is the specified track width dimension Since it is about 20tiIA, the track processing size is processed to a 15tJR culm degree.

After track processing, a metal magnetic film is deposited by sputtering. The gold i magnetic film uses a soft magnetic material such as sendust or amorphous alloy, which has a magnetic permeability of 8 and a high saturation magnetic flux density (FIG. 3(d)). Next, as shown in FIG. 3(fe), a surface is processed perpendicularly to the columnar track-processed surface in step 1 to form a gap abutting surface on the metal magnetic film deposited by sputtering.

After the above-mentioned gear lubricating surface processing, the winding process is carried out in the same manner as in the manufacturing process of the TSSi magnetic head mentioned above. 1i (41 is ground into the ferrite material (2b)), this groove (4) is inserted into the C core (2b) i TlA (2a) when the magnetic head is completed.
Filled with glass to maintain the bonding strength of the C core (2b
), ■ At least one side of the core (2a) has a magnetic gap (5
) is applied by sputtering. Generally 8 us VTR
In the magnetic head, the magnetic gap (5) formed by sputtering is about 0.2 uJn when optically measured, and the effective gap when measured by self-recording and reproducing of the magnetic head is about 0.25 uJn. Next, as shown in Fig. 3 ([) and (q), after glass bonding the C core (2b) and I core (2a), the A material was sliced into a predetermined width to form a magnetic circuit. The VTR head is completed.

[Effects of the Invention] As explained above, according to the present invention, by forming the notched groove with a bottom, it is possible to prevent stress from concentrating on the bottom of the notched groove in the I of the conventional construction. Cracks that occur at the bottom tip of the notched groove can be prevented.
Improved reliability by preventing crashes when the magnetic head is completed.
It is possible to prevent noise due to the occurrence of pseudo gaps.

In addition, according to the present invention (2), the track width dimensional accuracy depends on the positioning accuracy of the forming grindstone, so it is dramatically improved compared to the conventional SS structure magnetic head, where the track width dimensional viscosity was dependent on the wrap rate. Improves dimensional accuracy.

Furthermore, since the gi hypotenuse angle of the full notch can be made thinner (it can be set to 1: track width), the ♂ flexure that should be formed in the J direction can be made thinner, so that it is possible to thin the gi hypotenuse angle required for sputtering.
There is a remarkable effect that is not found in the conventional example, in that i is greatly reduced and production f1 is improved.

[Brief explanation of the drawing]

Figures 1 to 3 (a) to ((+1 indicates an embodiment of the present invention. Figure 1 is a perspective view showing the configuration of the magnetic head of the present invention, Figure 2 is the magnetic head of Figure 1. Front view, Figure 3 (al~
((J) is a process perspective view showing one embodiment of the manufacturing process of the magnetic head of the present invention, and FIGS. 4 to 6 (a) to (') show a conventional example of the flf! magnetic head. The figure is a perspective view showing the configuration of a conventional magnetic head. Figure 5 is a front view of the magnetic head in Figure 4, and Figures 6 (a) and (f) are perspective views showing the process of adding the conventional head. In the figure, (1a) Tlb)・= i If< l f1 body membrane (2
a)...I core of the magnetic head (2b)...C] of the magnetic head (3)...Glass (4)...Winding hole (5)...Gap (6)...Cut Notch groove patent applicant Alps Electric Co., Ltd. 2 Representative Kata Oka
Policy map 5

Claims (1)

[Claims] In a magnetic head in which a magnetic metal material having a high saturation magnetic flux density is formed on an opposing surface of a magnetic core to form a magnetic circuit through a magnetic gap, the thickness of the metallic magnetic material formed on the opposing surface of the magnetic core is A magnetic head characterized in that a magnetic core is formed with an inclination at a predetermined angle with respect to an opposing surface.