JPH0643811U - Magnetic head - Google Patents

Abstract

(57) [Abstract] [Purpose] With a simple configuration, it is possible to increase the output of a magnetic head. [Structure] At least a part of the magnetic material in the multilayer magnetic film 24 provided on the core 21 is formed by sticking a large number of rod-shaped magnetic members, thereby reducing the film area,
It is designed to completely prevent the generation of eddy currents and improve the efficiency of magnetic flux flow.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a magnetic head using a magnetic film.

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, there is known a magnetic head in which a pair of cores coated with a magnetic film are arranged to face each other to form a predetermined gap. In such a magnetic head, a so-called inner peripheral laminated type in which a magnetic film is laminated on the facing surface portion of the core as in JP-A-4-125806, or a magnetic film is laminated in the track width direction There is a so-called laminated type.

For example, in a laminate type magnetic head, as shown in FIG. 4, a pair of cores 1 and 1 opposed to each other so as to form a gap G is provided with a magnetic film 2 in the track width direction. 2 are laminated and film-formed, and non-magnetic substrates 3 and 3 are arranged so as to sandwich both sides of each of the magnetic films 2. The magnetic film 2 is a stack of a magnetic film and a non-magnetic layer, and the tape runs on the gap forming surfaces of the magnetic film 2 and the non-magnetic substrate 3. A coil 6 for inputting / outputting a recording / reproducing signal is wound around the core 1 through a coil window 5 formed in a portion where the cores 1 and 1 face each other.

In this case, the magnetic film 2 is composed of a multi-layer magnetic film formed by laminating a plurality of sets in which a magnetic layer and a non-magnetic layer are stacked in order to improve output in a high frequency region. With this multilayer magnetic film, generation of eddy currents on the tape sliding surface is suppressed.

[0005]

[Problems to be solved by the device]

 However, the use of such a multilayer magnetic film cannot completely prevent the generation of eddy currents. For example, in the case of the above laminated magnetic head, as shown in FIG. 5, a relatively large film area is formed on the side surface of the head chip, and an eddy current A is generated there. This also applies to the inner peripheral laminated type magnetic head. As described above, in the conventional magnetic film laminated type magnetic head, eddy current is still generated, which causes a reduction in output efficiency.

Therefore, an object of the present invention is to provide a magnetic film laminated type magnetic head in which generation of an eddy current is completely prevented and a high output can be easily obtained.

[0007]

[Means for Solving the Problems]

 To achieve the above object, the present invention provides a magnetic head in which cores are opposed to each other with a gap as a boundary, and the core is formed by stacking a plurality of magnetic body and non-magnetic body. The multi-layered magnetic film is formed, and a large number of rod-shaped magnetic materials are attached to at least a part of the magnetic body in the multi-layered magnetic film.

[0008]

[Action]

 In the means having such a structure, the film area of the multi-layer magnetic film is suppressed to be small in every position, whereby the generation of eddy current is completely prevented and the magnetic flux flow efficiency is improved. There is.

[0009]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The embodiment shown in FIGS. 1 and 2 is one in which the present invention is applied to a so-called laminate type magnetic head, in which a pair of cores 11 and 11 arranged so as to face each other so as to form a gap G are provided. In the opposite portion, a side substantially hexagonal coil window 12 is formed so as to penetrate in the track width direction, and a recording / reproducing signal is input and output by passing through the inside of the coil window 12. The coil 13 of is wound around the core 11.

A multilayer magnetic film 14 is laminated on each core 11 in the track width direction, and the multilayer magnetic film 14 is sandwiched from both sides on both sides of the multilayer magnetic film 14 in the track width direction. Thus, the non-magnetic substrates 15 and 15 are arranged. The surface on which the gap G is formed (the upper surface in the drawing) in the multilayer magnetic film 14 and the non-magnetic substrate 15 is formed on the tape sliding surface, and the tape is configured to run on the tape sliding surface. ing.

At this time, the multi-layered magnetic film 14 is formed by sticking a large number of rod-shaped magnetic members. This rod-shaped magnetic member is made of a ferromagnetic metal such as sender, and the surface thereof is covered with a non-magnetic material such as glass (SiO ₂ ).

On the other hand, as the non-magnetic substrate 15, a non-magnetic head substrate material such as crystallized glass or ceramics is used. Note that the non-magnetic material as in this embodiment is used, for example, when it is premised on the use of a high frequency band of around 30 MHz, and when it is premised on the use up to a high band of about 5 MHz. For this, a ferromagnetic material having a high magnetic permeability such as ferrite or Sendust alloy is used.

In such an embodiment, since the multilayer magnetic film 14 is composed of a rod-shaped magnetic member, a magnetic film having a large film area (see FIG. 5) unlike the conventional case is not formed. The membrane area is kept small in all parts. Therefore, the generation of eddy currents is completely suppressed, and the flow efficiency of magnetic flux is improved.

The second embodiment shown in FIG. 2 is one in which the present invention is applied to a so-called inner peripheral lamination type magnetic head, and a multilayer magnetic film 24 is laminated on the facing surface portion of the core 21. Has been formed. The multi-layer magnetic film 24 is formed by sticking a large number of rod-shaped magnetic members, and is provided from the surface on which the gap G is formed to the inner peripheral surface of the groove forming the coil window 22. The surface of the rod-shaped magnetic member is covered with a non-magnetic layer. Also in such a second embodiment, it is possible to obtain the same actions and effects as those of the first embodiment.

Further, in the case of the second embodiment, as shown in FIG. 3, for example, one layer of magnetic film 24a may be formed on the multilayer magnetic film 24 made of a rod-shaped magnetic member. . By doing so, the rod-shaped magnetic member can be protected.

[0016]

[Effect of device]

 As described above, in the magnetic head according to the present invention, at least a part of the magnetic substance in the multilayer magnetic film is formed by sticking a large number of rod-shaped magnetic members so that the film area can be reduced. Therefore, it is possible to completely prevent the generation of eddy currents with a simple structure, improve the magnetic flux flow efficiency, and easily obtain a high output.

[Brief description of drawings]

FIG. 1 is an external perspective view showing the structure of a magnetic head according to an embodiment of the present invention.

FIG. 2 is a partial external perspective view showing the structure of a magnetic head according to another embodiment of the present invention.

FIG. 3 is a partial perspective view showing the structure of a magnetic head according to still another embodiment of the present invention.

FIG. 4 is an external perspective view showing the structure of a general laminated magnetic head.

FIG. 5 is an explanatory side view showing an eddy current generation state in a conventional magnetic head.

[Explanation of symbols]

 11,21 core 14,24 multi-layer magnetic film 15 non-magnetic substrate G gap

Claims (1)

[Scope of utility model registration request] 1. A magnetic head in which cores are arranged on opposite sides of a gap as a boundary, wherein the core has a multi-layered magnetic film in which a plurality of sets of a magnetic material and a non-magnetic material are stacked. A magnetic head, characterized in that at least a part of a magnetic material in the multilayer magnetic film is formed by sticking a large number of rod-shaped magnetic members.