JPH06282809A - Magnetic head - Google Patents

Abstract

PURPOSE:To prevent lowering of a reproduced output of a magnetic head even when a recording frequency becomes high and the inductance of the head becomes small with the execution of high-density recording. CONSTITUTION:In regard to a magnetic head wherein a magnetic gap is formed by holding a nonmagnetic substance film by a metal magnetic film 4 having a high saturation magnetic flux density, the head comprises an I type half-body core 2 of a nonmagnetic substance having the aforesaid metal magnetic film 4 disposed and a C type half-body core 5 of a ferro-magnetic substance having the metal magnetic film 4 disposed. The I type half-body core 2 of the nonmagnetic substance is provided with a slant part 3 being non-parallel to the magnetic gap (g), and the metal magnetic film 4 is disposed on the slant part 3.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a VTR, HDD and FD.
The present invention relates to a high-density recording magnetic head mounted on a D device and the like, and a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, as a magnetic head for high density recording used in a VTR device or the like, for example, M shown in FIG.
There is an IG head 31. This head is composed of a core chip in which a pair of cores 32-32 made of a ferromagnetic material such as ferrite is joined and integrated, and a metal magnetic film 33 such as sendust having a high saturation magnetic flux density is coated on the joint surface of the pair of cores 32. The core chip 3 is formed by interposing a non-magnetic film [not shown] such as SiO ₂ which serves as a gap spacer.
A magnetic gap g is formed on the first medium sliding surface 34.

[0003]

By the way, the above-mentioned M
The IG head has the following problems.

In the MIG head, since the material mainly forming the magnetic path is a ferromagnetic material such as ferrite, the cross-sectional area S _{2 of the} magnetic path is wide due to the necessity of manufacturing it. Therefore, the inductance L of the head is apt to increase, and when recording at a high recording frequency, the recording current waveform is unlikely to rise sharply with time, making it difficult to perform recording at a high recording frequency.

Further, in the MIG head, in order to reduce the inductance L without changing the outer shape of the core, it is necessary to narrow the cross-sectional area S _{2 of the} magnetic path. There is a method of increasing the length l or reducing the chip core thickness T. However, in the former, there is a problem that the magnetic resistance increases because the magnetic path length increases, the reproduction efficiency decreases, and the output decreases rather. In the latter case, the core chip is thin and the core chip is easily broken, There is a problem that the assembly process of lines and the like becomes difficult.

Therefore, the present invention has been proposed in view of the above problems, and it is an object of the present invention to reduce the inductance of the head and reduce the head output even when recording at a high recording frequency. It is another object of the present invention to provide a magnetic head and a method for manufacturing the same, which does not lower the mechanical strength of the core chip.

[0007]

As a technical means for achieving the above object, a magnetic head according to the present invention is a magnetic head in which a magnetic gap is formed by sandwiching a non-magnetic film with a metal magnetic film having a high saturation magnetic flux density. In the head, a non-magnetic I-type half core in which the metal magnetic film having the high saturation magnetic flux density is arranged and a ferromagnetic C half core in which the metal magnetic film having the high saturation magnetic flux density is arranged. It is characterized by

In the above magnetic head, the non-magnetic I-type half core is provided with an inclined surface portion that is not parallel to the magnetic gap, and a metal magnetic film having a high saturation magnetic flux density is arranged on the inclined surface portion. Is characterized by.

Furthermore, the length of the metal magnetic film having a high saturation magnetic flux density in the direction along the slope is set to 0.03 mm to 0.3 mm.

Further, in the method of manufacturing a magnetic head according to the present invention, a groove having a plurality of inclined surface portions is formed on a surface to be joined of a non-magnetic long block along the lateral direction thereof, and a high saturation magnetic flux is formed in the groove. A step of depositing and forming a metal magnetic film having a density to a predetermined track width, filling a nonmagnetic material on the metal magnetic film, and mirror-polishing the bonding surface of the nonmagnetic material long block; , A plurality of track grooves are formed on a mirror-polished joint surface of a ferromagnetic long block along its widthwise direction, leaving a predetermined track groove, and the joint surface is made of a metal magnet having a high saturation magnetic flux density. A step of depositing and forming a film, a step of butting and integrating the non-magnetic long block and the ferromagnetic core block by abutting the non-magnetic film serving as a gap spacer between the joining surfaces of the block and the joining Become And the long block was sliced along the lateral direction, characterized in that comprising the step of obtaining a thin plate-like core chip.

[0011]

In the magnetic head according to the present invention, the magnetic path is formed only by the metal magnetic film having a high saturation magnetic flux density in the non-magnetic I-type half core, and as a result, the cross-sectional area can be easily reduced. Since the inductance of the head can be reduced, recording at high frequency can be easily performed.
Moreover, since the saturation magnetic flux density of the metal magnetic film is larger than that of ferrite or the like, even if the cross-sectional area of the metal magnetic film is narrowed, the magnetic flux flowing from the magnetic medium flowing from the magnetic gap during reproduction can leak to the outside of the core. Therefore, it is possible to prevent the reproduction output from decreasing.

Further, since the volume of the non-magnetic I-type half core is mainly composed of the non-magnetic material, it is not necessary to reduce the volume more than necessary. Therefore, the core chip is wound without lowering its mechanical strength. The assembly process of wires and the like can be performed, and the core chip is not easily broken.

[0013]

Embodiment 1 An embodiment of a magnetic head and a method of manufacturing the same according to the present invention will be described with reference to FIGS.

First, FIG. 1 shows a VTR magnetic head core chip 1 according to the present invention. As shown in this figure, this magnetic head has a non-magnetic I-shaped half core 2 having a slope 3 that is not parallel to the magnetic gap g. On that slope 3,
The metal magnetic film 4 having a high saturation magnetic flux density such as sendust is provided, and the metal magnetic film 4 having a high saturation magnetic flux density such as sendust is provided on the joint surface of the ferromagnetic C-type half core 5. The medium sliding of the core chip 1 is achieved by interposing a non-magnetic material film (not shown) such as SiO _{2 serving} as a gap spacer between the joining surfaces of the mold half core 2 and the ferromagnetic C-type half core 5. A magnetic gap g is formed on the surface 6.

According to this embodiment, on the side of the non-magnetic I-type half core 2, the magnetic path is constituted only by the metal magnetic film 4 having a high saturation magnetic flux density such as sendust. The cross-sectional area S ₁ is narrow and the head inductance L
Can be reduced, and the recording current waveform tends to rise sharply with time even when recording at a high frequency.
High density recording can be easily realized.

Moreover, since the saturation magnetic flux density of the metal magnetic film 4 such as sendust is larger than that of ferrite,
Even if the cross-sectional area S ₁ is narrowed, the magnetic flux flowing from the recording medium into the magnetic gap during reproduction will not leak outside the core, and the reproduction output will not be reduced.

Further, since the non-magnetic I-type half core 2 is mechanically reinforced with a non-magnetic material, it does not become a magnetic path even if the volume is large, so it is not necessary to make it smaller than necessary.
There is no risk of damaging the core chip 1 in the process of assembling the winding wire or the like without lowering the mechanical strength of the core chip 1.

Further, if the length L of the metal magnetic film 4 along the direction of the inclined surface portion 3 is shorter than 0.03 mm, the cross-sectional area of the magnetic path becomes too narrow and the magnetic resistance increases, which may reduce the reproduction output. If the length L is larger than 0.3 mm, the inductance of the head tends to be large, recording at high frequency may be difficult, and high-density recording / reproduction may not be possible. Length L along 3 directions is 0.03mm to 0.3mm
It is desirable to be in between.

Next, a method of manufacturing the magnetic head according to the present invention is shown in FIGS.

As shown in FIG. 5, a plurality of V-shaped grooves 12 are formed by cutting at predetermined intervals on the joining surfaces of the non-magnetic long blocks 11 along their shorter sides, and the V-shaped grooves 12 are formed.
A metal magnetic film 13 having a high saturation magnetic flux density, such as sendust, is formed in the groove 12 by a thickness such that a predetermined track width can be obtained. Here, although not shown, the metal magnetic film 1
It goes without saying that a laminate layer in which 3 and an insulating thin film such as SiO ₂ or Al ₂ O ₃ are alternately laminated may be formed.

Next, a non-magnetic material 14 such as low-melting glass is filled on the metal magnetic film 13 and the joint surface 15 of the long non-magnetic material block 11 is mirror-polished to obtain the non-magnetic material length shown in FIG. The scale block 11 is obtained.

Further, as shown in FIG. 8, a mirror-polished surface 15 of the ferromagnetic long block 16 to be bonded is to be
A plurality of track grooves 18 are formed while leaving a predetermined track width along the widthwise direction, and a metal magnetic film 13 having a high saturation magnetic flux density, such as sendust, is deposited and formed on the planned joining surface 15 of the track grooves 18.

Next, as shown in FIG. 9, the non-magnetic long block 11 and the ferromagnetic long block 16 are made of a non-magnetic material such as SiO ₂ or Al ₂ O ₃ which serves as a gap spacer between the joint surfaces 15 thereof. A film (not shown) is interposed and heated by being abutted against each other to be joined and integrated to obtain a long core block 17 shown in FIG. Then, the long core block 17
Is sliced at a constant pitch to obtain the core chip 1 shown in FIG. Here, FIG. 9b shows an enlarged plan view of the C portion of FIG. 9a, and g constitutes the magnetic gap.

[0024]

[Embodiment 2] FIG. 2 shows a second embodiment of the present invention H
The magnetic head 21 for DD. FIG. 2b shows an enlarged perspective view of part A of FIG. 2a. This HDD magnetic head 21 is
As shown in the figure, the core chip 1 according to the present invention is joined and integrated with the slider 22, and the manufacturing method thereof is shown in FIGS. 2 to 4.

First, one side surface of the core chip 1 shown in FIG. 1 is mirror-polished until the magnetic gap g is exposed to provide a slider joint surface 23, and the HDD is mirror-polished on one side as shown in FIG. Core chip 24
To get Next, as shown in FIG. 4, the joining surface 23 of the HDD core chip 24 and the slider 22 having the winding groove 25 are joined and integrated to obtain a predetermined gap depth (not shown). The moving surface (air bearing surface) 26 is mirror-polished and a levitation inclined surface 27 is provided.

Next, as shown in FIG. 2, the track forming inclined portion 28 is provided so as to obtain a predetermined track width Tw, and the HDD magnetic head 21 is obtained. HD according to the invention
In the D magnetic head 21, the magnetic path is constituted only by the metal magnetic film 13 having a high saturation magnetic flux density such as sendust on the side of the non-magnetic I-type half core 2, so that the cross-sectional area can be narrowed. It becomes easy and the inductance L of the head can be reduced. Further, since the non-magnetic I-type half core is mainly composed of a non-magnetic material, it does not become a magnetic path and its volume is made smaller than necessary. do not have to. Therefore, the strength of the HDD core chip 24 does not decrease, and the HDD core chip 24 is not damaged in the process of assembling the winding or the like.

[0027]

As described above, the magnetic head according to the present invention has a magnetic gap formed by sandwiching a non-magnetic material film with a metal magnetic film having a high saturation magnetic flux density so that the high saturation magnetic flux density can be reduced. And a ferromagnetic C-type half core in which the above-mentioned metal magnetic film having a high saturation magnetic flux density is arranged. Since the half core is provided with an inclined surface portion that is not parallel to the magnetic gap and the metal magnetic film having a high saturation magnetic flux density is arranged on the inclined surface portion, the non-magnetic material I-type half core side has a high saturation magnetic flux. Since the magnetic path is formed only by the metal magnetic film having a density, it is easy to reduce the cross-sectional area, the inductance L of the head can be reduced, and recording at a high recording frequency can be easily performed. , High density recording There is an effect that can be. Furthermore,
Since most of the non-magnetic I-type half cores are made of non-magnetic materials that do not form a magnetic path, it is not necessary to reduce the volume more than necessary, and the core chip mechanical strength is not lowered. It is possible to prevent the core chip from being damaged in the assembly process of wires and the like. Further, by setting the length of the metal magnetic film along the direction of the inclined surface portion from 0.03 mm to 0.3 mm, the inductance L can be reduced without lowering the reproduction output of the head.

[Brief description of drawings]

FIG. 1 is a perspective view showing a magnetic head core chip of the present invention mounted on a VTR device.

2A is a perspective view showing a magnetic head of the present invention mounted in an HDD device, and FIG. 2B is an enlarged perspective view of a portion A of FIG. 2A.

FIG. 3 is a perspective view showing a method of manufacturing the HDD magnetic head of FIG.

4A is a perspective view showing a method of manufacturing the HDD magnetic head of FIG. 2, and FIG. 4B is an enlarged perspective view of a portion B of FIG. 4A.

5 is a perspective view showing a method of manufacturing the magnetic head for VTR of FIG. 1. FIG.

6 is a perspective view showing a method of manufacturing the magnetic head for VTR of FIG. 1. FIG.

7 is a perspective view showing a method for manufacturing the VTR magnetic head of FIG. 1. FIG.

8 is a perspective view showing a method of manufacturing the magnetic head for VTR of FIG.

9A is a perspective view showing a method for manufacturing the VTR magnetic head of FIG. 1, and FIG. 9B is an enlarged plan view of a C portion of FIG. 9A.

FIG. 10 is a perspective view showing a specific example of a conventional MIG head.

[Explanation of symbols]

1 Core Chip 2 Non-magnetic I-type Half Core 3 Slopes Non-parallel to Magnetic Gap 4 Metal Magnetic Film with High Saturation Flux Density 5 Ferromagnetic C-type Half Core g Magnetic Gap L Slope of Metal Magnetic Film 4 Length along the direction of the portion 3 S ₁ Cross-sectional area of the metal magnetic film 4 arranged on the I-shaped half core 2.

Claims (4)

[Claims] 1. A non-magnetic material type I in which a metal magnetic film having a high saturation magnetic flux density is arranged in a magnetic head having a magnetic gap formed by sandwiching a non-magnetic material film with a metal magnetic film having a high saturation magnetic flux density. A magnetic head comprising a half core and a ferromagnetic C-type half core in which a metal magnetic film having the high saturation magnetic flux density is arranged. 2. A surface of the non-magnetic I-shaped half core which is non-parallel to the magnetic gap when viewed from the sliding surface side is formed on the I-shaped half core, and a high surface is formed on the non-parallel surface. The magnetic head according to claim 1, wherein a metal magnetic film having a saturation magnetic flux density is arranged. 3. The metal magnetic film having a high saturation magnetic flux density has a thickness of 0.03 mm to 0.3 mm on a surface not parallel to the magnetic gap when viewed from the sliding surface side. The magnetic head described. 4. A groove having a plurality of inclined surface portions is formed along a short side direction on a surface to be joined of a nonmagnetic long block, and a metal magnetic film having a high saturation magnetic flux density is formed in the groove in a predetermined track. The process of depositing the metal magnetic film with a thickness to obtain a width, then filling the nonmagnetic material on the metal magnetic film, and mirror-polishing the joint surface of the nonmagnetic long block, and the mirror long polishing of the ferromagnetic long block. A plurality of track grooves are formed on the bonded surface along a widthwise direction of the bonded surface, leaving a predetermined track width, and a metal magnetic film having a high saturation magnetic flux density is formed on the bonded surface. A step of joining the non-magnetic long block and the ferromagnetic long block to each other through a non-magnetic film serving as a gap spacer between the joining surfaces to join and integrate the joined long block. Sliced along Method of manufacturing a magnetic head, characterized in that it consists of a step of obtaining a thin plate-like core chip.