JPH02220209A - Magnetic head - Google Patents

Abstract

PURPOSE:To reduce formation of a metallic magnetic body at the time of producing a magnetic head, and to reduce the production cost and the device cost by allowing a ferrite core having a high permeability and a gap surface having a high permeability to face each other with a metallic magnetic body having a high saturation magnetic density between them. CONSTITUTION:At the time of recording/reproducing of the magnetic head, the magnetic flux generated by the signal current flowing to a winding coil 5 in the process of recording to a recording medium 6 passes a ferrite core 3 and a metallic magnetic body 1 and passes in the tape in the part of a gap 2. The magnetic flux is dispersed by the core 3 in the leading side of the tape running direction and is concentrated by the magnetic core 1 having a high saturation magnetic flux density in the trailing side. In the reproducing process, the magnetic flux generated from the tape recording magnetic flux is led into the core 3 by the magnetic body 1 to hold the reproducing efficiency. Thus, formation of the metallic magnetic body is reduced at the time of producing the magnetic head to reduce the production cost and the device cost.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic head used in a magnetic recording/reproducing device that requires high saturation magnetic flux density.

[Conventional technology]

Conventionally, magnetic heads that require a higher saturation magnetic flux density than ferrite heads can be roughly divided into two types, as shown in Figure 3, in which the entire core is made of a metallic magnetic material with a high saturation magnetic flux density, and two types, as shown in Figure 4. There is a type in which a part of the core, especially the vicinity of the gamb, is made of the same metallic magnetic material. In Fig. 3, 1 is a gold i magnetic material with high saturation magnetic flux density, 2 is a gap material made of a non-magnetic material constituting the gap, 4 is a bonding material for joining the metal magnetic material l, and 5 is a signal recording and reproducing material. This is a winding coil that performs. Further, in Fig. 4, 1 is a metal magnetic material with high saturation magnetic flux density, 2 is a gap material made of a non-magnetic material constituting the gap, 3 is a ferrite core material, and 4 is a material for joining the metal magnetic material l and the core material 3. The bonding material 5 is an @ wire coil for recording and reproducing signals.

When recording No. 13 using the magnetic head described above, a current is passed through the wire-wound coil 5, and the magnetic flux generated by the magnetomotive force is transmitted between the metal magnetic material 1 (Fig. 3) or the metal magnetic material 1 and the ferrite core material. 3 (FIG. 4) and gap material 2. At this time, since the gap material 2 is a non-magnetic material, the magnetic flux protrudes outward at the gap portion, and this protruding magnetic flux magnetizes the magnetic tape placed facing the gap portion, thereby recording a signal on the tape. On the other hand, during reproduction, the magnetic flux from the recorded magnetization on the magnetic tape passes through the metal magnetic body 1 and generates an electromotive force in the wire-wound coil 5. This is extracted as a reproduced signal.

[Problem to be solved by the invention]

Since the conventional magnetic head is configured as described above,
In the type where the entire core is made of a metal magnetic material, there is an inflection point (plane) of magnetic permeability between the metal magnetic material 1 and the ferrite core material 3.
exists and acts as a pseudo gap during playback. In order to reduce this pseudo-gap phenomenon, conventionally the pseudo-gap surface is made non-parallel to the two surfaces of the original gap material.

In other words, since the metal magnetic material l is thick enough to make the bonding surfaces non-parallel and is formed on both cores, there is still a problem in that it is disadvantageous in terms of cost.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to obtain a magnetic head in which the amount of metal magnetic material formed during manufacturing of the magnetic head is reduced (suppressed).

[Means to solve the problem]

The magnetic head according to the present invention has a magnetic core made of high magnetic permeability ferrite and a magnetic core made of high magnetic permeability ferrite with a magnetic metal material having a high saturation magnetic flux density added to the gap surface, facing each other with a gap material in between. , the magnetic core is equipped with a wire-wound coil for recording and reproducing signals.

[For production]

In this invention, with the above configuration, during the recording process, the magnetic flux generated from the signal current flowing through the winding coil passes through the metal magnetic material and the magnetic core, and passes through the tape at the gap portion. Furthermore, during the reproduction process, the magnetic flux generated from tape recording magnetization is drawn into the magnetic core using a metal magnetic material, thereby ensuring reproduction efficiency.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure shows a configuration diagram and an enlarged view of the main parts of a magnetic head according to the present invention. 1 is a metal magnetic material with a high saturation magnetic flux density formed in the core on the rear side in the tape running direction;
The film thickness is A-z of the signal recording wavelength on the magnetic tape.

However, in this case, the film thickness refers to the thickness of the part of the metal film that is effective as a magnetic material with high saturation magnetic flux density. 2 is the gap material made of non-magnetic material that constitutes the gear, It is formed to have a thickness equal to or less than the recording wavelength A. 3 is a ferrite core with high magnetic permeability that constitutes the magnetic head, 4 is a bonding material that joins these cores 3, and 5 is a wound coil for recording and reproducing signals, and the coil terminals are connected to a recording amplifier and a reproducing device (not shown). Amplifier is connected.

FIG. 2 shows a schematic diagram of the recording and reproducing process of the magnetic head according to the present invention. In the figure, reference numeral 6 indicates a magnetic tape as a recording medium.

First, in the recording process, the magnetic flux generated from the signal current flowing through the winding coil 5 leaves the ferrite core 3 and the metal magnetic material 1, and passes through the tape in the gap 2 portion. At this time, the front side in the tape running direction is the ferrite core 3.
Therefore, the magnetic flux is dispersed, but because the rear side is a metal magnetic material l with a high saturation magnetic flux density, the magnetic flux is concentrated. Further, the magnetized portion remaining on the magnetic tape 6 as the tape runs is the magnetization of a fan-shaped magnetic flux concentration portion formed at the rear side of the tape run, as shown in the figure.

On the other hand, in the reproduction process, reproduction efficiency is ensured by drawing the magnetic flux generated from tape recording magnetization into the core using the metal magnetic material l. A part of the reproduced magnetic flux becomes an oven loop, and although it is slightly inferior to that when forming the ferrite core 3, there is no problem in use. In particular, there are no problems with tapes recorded using the magnetic head of the present invention, and sufficient playback efficiency can be obtained.

In addition, since the pseudo gap phenomenon that occurs between the metal magnetic material l and the ferrite core 3 is less than the wavelength A from the original gap, almost the same signal is reproduced, and it is reproduced as a signal component. It will not adversely affect the signal.

Although the magnetic head according to the present invention has been described with respect to a magnetic tape head, the same effect as described above can also be obtained with a head for a longitudinal recording type magnetic disk device.

〔Effect of the invention〕

As explained above, according to the present invention, a ferrite core with high magnetic permeability and a ferrite core which also has high magnetic permeability and has a magnetic metal material with high saturation magnetic flux density added to the gap surface are opposed to each other with a gap material in between. As a result, the amount of metal magnetic material formed during the manufacture of the magnetic head can be kept to a minimum, thereby reducing manufacturing costs and device costs.

[Brief explanation of the drawing]

Fig. 1 is a block diagram and an enlarged view of the main parts of a magnetic head according to an embodiment of the present invention, Fig. 2 is an explanatory diagram of the recording and reproducing process of the magnetic head, and Figs. 3 and 4 are of a conventional type. FIG. 3 is a configuration diagram of a different magnetic head. 1... Metal magnetic material with high saturation magnetic flux density, 2... Gap material, 3... Ferrite core. Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent Masuo Oiwa Figure 2 Figure 1 Figure 3 Figure 4

Claims (1)

[Claims] It has a magnetic core made of high magnetic permeability ferrite, and a magnetic core made of high magnetic permeability ferrite, with a magnetic metal material having a higher saturation magnetic flux density added to the surface corresponding to the gap surface. A magnetic head comprising a wire-wound coil which is opposed to each other with a gap material interposed therebetween and which records and reproduces signals on the magnetic core.