JPH0579708U - Magnetic head - Google Patents

Abstract

(57) [Summary] [Purpose] Sufficient properties can be obtained even with a single-layer thin film. [Structure] A magnetic head 1 is provided with two core bodies 2 and 3, a winding window 4 formed by joining the core bodies 2 and 3 and a gap 5, and the two core bodies 2 at the positions of the winding windows 4 are provided. The magnetic bodies 6 and 7 are disposed and fixed to the magnetic field 3. Core body 2, 3
Center joints 2a, 3a and the joints 2b, 3b at the gap 5 position
Further, metal magnetic thin films 8 and 9 having high saturation magnetic flux density or high magnetic permeability are formed on the magnetic bodies 6 and 7. Two core bodies 2, 3
Is formed of a non-magnetic material such as ceramic or crystallized glass, and rhombus-shaped recesses 2c and 3c are formed at the positions of the winding windows 4 to fix the magnetic bodies 6 and 7. In the gap 5, a gap material such as SiO ₂ is sandwiched. The magnetic bodies 6 and 7 are formed in a substantially lateral V-shape using a metal such as sendust or amorphous, or an oxide magnetic material such as ferrite. The metal magnetic thin films 8 and 9 having a high saturation magnetic flux density or a high magnetic permeability are formed by sputtering to have a thickness of 5 μm, for example.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a VTR magnetic head for recording / reproducing a wideband signal such as a high-definition TV with a high CN ratio.

[0002]

[Prior Art]

 A magnetic head for a VTR for recording / reproducing a wide band signal such as a high-definition TV with a high CN ratio has a magnetic core composed of a high-permeability ferrite core body and a metal magnetic film having a high saturation magnetic flux density near a gap. A ferrite MIG head such as a metal in-gap head (hereinafter referred to as MIG head), a parallel MIG head, or a MIG head using a non-magnetic substrate is used. In the above ferrite MIG head, sliding noise occurs due to the ferrite material. In the parallel type MIG head, in addition to the gap 5 in FIG. 3, the pseudo output due to the pseudo gap a generated at the boundary between the metal magnetic thin films 8'and 9'and the ferrite core bodies 2'and 3'is a problem. In a MIG head using a non-magnetic substrate, in order to obtain characteristics, the film thickness formed by sputtering or the like for forming a thin film must be increased or laminated, and the volume of the magnetic material must be increased. There was a drawback. Further, if the thickness of the metal magnetic film is increased, eddy current is generated and reproduction efficiency deteriorates, resulting in poor image quality and sound quality. Further, the laminated type of the metal magnetic film has a drawback that productivity (workability) is poor.

[0003]

[Problems to be solved by the device]

 The problem to be solved is that when the film thickness of the metal magnetic film is increased, eddy current is generated, reproduction efficiency is deteriorated, image quality and sound quality are deteriorated, and the laminated type is poor in productivity. In view of the above drawbacks, an object of the present invention is to propose a magnetic head capable of obtaining sufficient characteristics even with a single-layer thin film.

[0004]

[Means for solving the problem]

 The present invention has two core bodies, a winding window formed by joining the core bodies, and a metal magnetic thin film having a high saturation magnetic flux density or a high magnetic permeability in the joining portion of the core bodies and the winding window. It is a gist of the present invention to provide a magnetic head including two core bodies made of a non-magnetic material and a magnetic body disposed on the joint surface side of the core bodies.

[0005]

[Action]

 No sliding noise occurs, excellent wear resistance, and head wear is suppressed. The occurrence of pseudo gaps and pseudo outputs is prevented. Further, even if the magnetic thin films 8 and 9 are single layers, sufficient recording / reproducing characteristics can be obtained by having the magnetic bodies 6 and 7 inside the head. The magnetic head 1 has a simple structure and is excellent in mass productivity.

[0006]

【Example】

 The present invention will be described below with reference to the illustrated embodiment. FIG. 1 is a first embodiment, and FIG. 1 is a perspective view of a magnetic head.

The magnetic head 1 is provided with two core bodies 2 and 3, a winding window 4 formed by joining the core bodies 2 and 3 and a gap 5, and the two core bodies 2 at the positions of the winding windows 4 are provided. Magnetic bodies 6 and 7 are disposed and fixed to the magnetic field 3 of FIG. Metal magnetic thin films 8 and 9 having high saturation magnetic flux density or high permeability are formed on the joints 2a and 3a at the center of the core bodies 2 and 3, the joints 2b and 3b at the gap 5 and the magnetic bodies 6 and 7, respectively. There is. A sealing glass material 10 is fixed to the metal magnetic thin films 8 and 9 at the upper part of the winding window 4 and the lower ends of the core bodies 2 and 3, respectively.

The two core bodies 2 and 3 are made of a non-magnetic material such as ceramic or crystallized glass, and diamond-shaped recesses 2c and 3c are formed at the position of the winding window 4 to fix the magnetic bodies 6 and 7. Has been. Recesses 2d, 3d (not shown) for coil winding are formed on both sides of the winding windows 4 of the two core bodies 2, 3.

In the gap 5, a gap material such as SiO ₂ is sandwiched.

The magnetic bodies 6 and 7 are formed in a substantially lateral V-shape using a metal such as sendust or amorphous, or an oxide magnetic material such as ferrite.

The metal magnetic thin films 8 and 9 having a high saturation magnetic flux density or a high magnetic permeability are formed by sputtering to have a thickness of 5 μm, for example.

When the magnetic head 1 is configured as described above, since the two core bodies 2 and 3 are made of a non-magnetic material such as ceramic or crystallized glass, sliding noise such as ferrite is generated. Without doing so, it has excellent wear resistance and suppresses head wear. The generation of pseudo gaps and pseudo outputs that occur in MIG heads that use ferrite is prevented. Further, even if the magnetic thin films 8 and 9 are single layers, sufficient recording / reproducing characteristics can be obtained by having the magnetic bodies 6 and 7 inside the head. A magnetic head 1 with a simple structure and excellent mass productivity can be obtained.

FIG. 2 shows a second embodiment, and FIG. 2 is a perspective view of a magnetic head.

In the second embodiment, the magnetic head 1 is provided with two core bodies 2 and 3, a winding window 4 ′ formed by joining the core bodies 2 and 3, and a gap 5. Joints 2b and 3b are formed in the core bodies 2 and 3 at the position of the gap 5, longitudinal recesses 2e and 3e are formed in the centers of the core bodies 2 and 3, and joints 2f and 3f are formed in the lower ends of the core bodies 2 and 3, respectively. Has been done. Metal magnetic thin films 8 and 9 having a high saturation magnetic flux density or a high magnetic permeability are formed on the joints 2b and 3b, the recesses 2e and 3e, and the joints 2f and 3f. Bulk magnetic bodies 6'and 7'are fixed to the vertically elongated recesses 2e and 3e of the core bodies 2 and 3, respectively. The winding windows 4'are formed in the magnetic bodies 6 ', 7'by the recesses 6a, 7a. A sealing glass material 10 is fixed between the top and bottom of the magnetic bodies 6'and 7'and the metal magnetic thin films 8 and 9.

[0015]

EFFECTS OF THE INVENTION Since the present invention is constructed as described above, since the two core bodies are made of non-magnetic material such as ceramic and crystallization glass, sliding noise such as ferrite is generated. In addition, it has excellent wear resistance and suppresses head wear. This prevents the occurrence of pseudo gaps and pseudo outputs that occur in MIG heads that use ferrite. Further, even if the magnetic thin film is a single layer, sufficient recording / reproducing characteristics can be obtained by having a magnetic material inside the head. It is possible to provide a magnetic head having a practically excellent effect such as a simple structure and excellent mass productivity.

[Brief description of drawings]

FIG. 1 is a perspective view of a magnetic head in a first embodiment.

FIG. 2 is a perspective view of a magnetic head in a second embodiment.

FIG. 3 is a perspective view of a conventional magnetic head.

[Explanation of symbols]

 1 magnetic head 2 and 3 core body 2a, 3a, 2b, 3b, 2f and 3f junction part 4 winding window 6, 7, 6 ', 7' magnetic body 8 and 9 metal magnetic thin film

Claims (3)

[Scope of utility model registration request] 1. A two-core body, a winding window formed by joining the core bodies, and a metal magnetic thin film having a high saturation magnetic flux density or a high magnetic permeability in the joint portion of the core body and the winding window. A magnetic head comprising: two core bodies made of a non-magnetic material; and a magnetic body disposed on the joint surface side of the core bodies. 2. The magnetic head according to claim 1, wherein the non-magnetic material is a wear resistant material. 3. The magnetic head according to claim 1, wherein a magnetic material is arranged near the winding window.