JPH0244508A - Magnetic head - Google Patents

Abstract

PURPOSE:To prevent the generation of a pseudo-gap and the lowering of S/N and to improve impulse resistance by joining magnetic cores, for which a metallic magnetic film is formed on the facing surface of an oxide magnetic substance, through a magnetic gap with mutually facing the magnetic substance and metallic magnetic film. CONSTITUTION:Inclinations 6a and 7a are respectively formed on the medium side facing surfaces of magnetic substances 6 and 7 which are composed of oxide magnetic materials. Coiling grooves 6b and 7b are provided on the magnetic substances 6 and 7. Metallic magnetic films 8 and 9 are formed by the material of high saturation magnetic flux density on the inclined surfaces 6a and 7a. On a boundary surface between non-magnetic substances 10 and 11 and the films 8 and 9, wavy unevenness is formed by mechanical working or etching. Then, the metallic magnetic films 8 and 9 and the magnetic substances 6 and 7 are mutually faced and joined through a magnetic gap 12.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic head used in a magnetic recording and reproducing apparatus that writes data to and reads data from a magnetic recording medium.

BACKGROUND ART With the improvement in image quality of VTRs and the increase in capacity of external storage devices for computers, it has become necessary to record data at high density on recording media.

For this reason, recording media are required to have high coercive force, and magnetic heads are required to be able to produce high magnetic flux density and have a narrow gap. In order to meet this requirement, conventional magnetic heads have been developed that have a structure in which a metal magnetic film with a high saturation magnetic flux density is formed on the gap-opposed surface of a ferrite magnetic head.

FIG. 11 is a perspective view showing a conventional magnetic head. 1st
In FIG. 1, 1 is an I-shaped core body, 2 is a U-shaped core body, and the core bodies 1 and 2 are made of an oxide magnetic material such as ferrite. Reference numeral 3 denotes a metal magnetic film formed on the surface of the core body 2 facing the core body 1. The metal magnetic film 3 is made of a material having a high saturation magnetic flux density such as sendust, and is formed by sputtering, vapor deposition, etc. ing. 4 is a magnetic gap. A magnetic head with this structure can generate sufficient magnetic flux density to record data on a high coercive force medium.

Problems to be Solved by the Invention However, in this conventional type of magnetic head, a part of the interface between the core body 2 and the metal magnetic film 3 appears on the medium facing surface, which acts as a pseudo gap and prevents signal coupling. There was a problem in that the noise ratio (hereinafter abbreviated as S/N ratio) deteriorated.

Also, the bonding force between an oxide magnetic material such as ferrite and glass is very strong, but the bonding force between a metal magnetic film such as sendust and glass is not so strong (therefore, unlike the conventional core body 1, When a metal magnetic film is formed on the entire joint surface of 2 and the core bodies 1 and 2 are joined through glass, the problem is that when an impact is applied to the head, the head may break into two from the joint surface. was there.

The present invention solves the above-mentioned conventional problems, and prevents the interface between the core and the metal magnetic film from appearing on the surface facing the medium, thereby preventing the occurrence of a pseudo gap (as well as improving impact resistance than before). The purpose is to provide a magnetic head that can perform

Means for Solving the Problem In order to achieve this object, a magnetic core in which a metal magnetic film is formed on the surface of a magnetic body made of an oxide magnetic material on the side facing the medium is connected to the magnetic core and the metal magnetic film. They were joined via a magnetic gap so that they faced each other.

Function: With this configuration, it is possible to prevent the interface between the magnetic material and the metal magnetic film from appearing on the surface facing the medium, and it is also possible to place the magnetic material, which has a strong bonding force with glass, facing the joint between the magnetic cores. can.

Embodiment FIG. 1 is a perspective view showing a magnetic head in an embodiment of the present invention. In FIG. 1, numerals 6 and 7 are magnetic bodies, and the magnetic bodies 6 and 7 are made of an oxide magnetic material such as Mn--Zn ferrite. Slopes 6a and 7a are formed on the medium facing surfaces of the magnetic bodies 6 and 7, respectively. Further, winding grooves 6b and 7b are provided in the magnetic body 6.degree.7, respectively.

Reference numerals 8 and 9 denote metal magnetic films formed on the slopes 6a and 7a, respectively, and the metal magnetic films 8 and 9 are made of a material with high saturation magnetic flux density, such as sendust.

Further, the metal magnetic films 8 and 9 are partially exposed on the medium facing surface. 10.11 is a nonmagnetic material formed on the metal magnetic film 8.9, and this is to prevent the metal magnetic films 8, 9 from being worn out due to friction with the magnetic recording medium. At this time, as shown in FIG. 2, the interface between the nonmagnetic material 10 and 11 and the metal magnetic films 8 and 9 has a wave shape. 12 is a magnetic gap, and glass is contained in the magnetic gap 12 as a gap filler.

A magnetic head having such a configuration has a metal magnetic film 8.
．． Since the bonding surface between the magnetic material 9 and the magnetic materials 6 and 7 is not exposed to the medium facing surface, a pseudo gap does not occur, and a decrease in the S/N ratio can be prevented.

In addition, the part where the metal magnetic films 8 and 9 are joined via the magnetic gap is a small part near the medium facing surface, and the magnetic material 6.7, which has a very strong bonding force with the glass, bridges the magnetic gap. Since most of the parts are joined through the joint, good joining strength is obtained and impact resistance is improved. Also, metal magnetic film 8.
Since the interface between the magnetic material 9 and the non-magnetic material 10 and 11 is wavy, it is possible to suppress the waving phenomenon of the reproduced output due to the contour effect. In addition, in the magnetic head of this structure, the metal magnetic films 8 and 9 and the magnetic bodies 6 and 7 face each other in the front gap, but the characteristics are similar to those of a conventional magnetic head in which a metal magnetic film is formed on the surface facing the gap. can be obtained.

Each step of the manufacturing method for the magnetic head in one embodiment of the present invention constructed as described above will be described below with reference to FIGS. 3 to 10.

First, as shown in FIG. 3, wave-shaped unevenness is formed on one surface of the oxide magnetic material substrate 13 by mechanical processing or etching technology. FIG. 4 is an enlarged view of the portion where the unevenness is formed. Next, a metal magnetic film 14 is formed on the oxide magnetic material substrate 13.

FIG. 5 is a partially enlarged view of this state. The shape of the surface of the oxide magnetic material substrate 13 appears as it is on the surface of the metal magnetic film 14. Next, a non-magnetic substrate 16 such as Zn ferrite or glass is bonded onto the metal magnetic film 14 via a binder 15 such as glass to form a core body 17 as shown in FIG. A partially enlarged view of this is shown in FIG. Next, the core body 17 is cut along the dotted line shown in FIG. 6 to cut out the core body 18.

FIG. 8 is a side view of the core par 18. Next, the core par 18 is cut along the dotted line shown in FIG. 8 to finish it into the shape shown in FIG. 9. Next, the two core bodies formed in this way are connected to the metal magnetic film 14 on the side closest to the medium facing surface.
The ends are overlapped and joined via a non-magnetic material. Finally, the medium facing surface is polished to expose the metal magnetic film 14,
Finish it into the shape shown in Figure 10.

As described above, in this embodiment, since the interface between the metal magnetic film and the oxide magnetic material is not exposed to the medium facing surface, there is no concern that a pseudo gap will occur. X: Since the metal magnetic film and the glass at the joint of the two cores are joined only in a small portion on the medium facing surface side, the joining force between the two cores can be strengthened.

Effects of the Invention The present invention provides a magnetic core in which a metal magnetic film is formed on the medium facing surface side of a magnetic body made of an oxide magnetic material, and a magnetic gap is formed so that the magnetic bodies and the metal magnetic films face each other. By joining them through the , it is possible to prevent the interface between the magnetic material and the metal magnetic film from appearing on the surface facing the medium, thereby eliminating the generation of pseudo gaps and preventing the SZN ratio from decreasing. . Furthermore, since a magnetic material having a strong bonding force with glass can be placed opposite the joint between the magnetic cores, the impact resistance of the core can be improved.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a magnetic head according to an embodiment of the present invention, FIG. 2 is a partial sectional view thereof, and FIGS. 3 to 10 are diagrams showing each process of manufacturing the magnetic head of this embodiment. FIG. 11 is a perspective view showing a conventional magnetic head. 6, 7... Magnetic material 6a. 6b. 7a...7b...9...11...l2...... Slope winding groove Non-magnetic metal magnetic film Magnetic gap

Claims (3)

[Claims] (1) Two magnetic cores each having a metal magnetic film formed on the surface facing the medium of a magnetic body made of an oxide magnetic material, etc., such that the magnetic bodies and the metal magnetic films face each other. A magnetic head characterized in that the two magnetic cores are joined via a magnetic gap. (2) A magnetic head according to claim 1, characterized in that a non-magnetic material is formed in the vicinity of the magnetic gap of the metal magnetic film and on the medium facing surface other than the vicinity thereof. (3) A magnetic head according to claim 2, characterized in that the interface between the nonmagnetic material and the metal magnetic film is non-parallel to the magnetic gap.