JPH0630907U - Magnetic head - Google Patents

Abstract

(57) [Abstract] [Purpose] It is possible to improve the wear characteristics of a laminated magnetic head against tape running, prevent so-called gap loss from increasing, and improve the strength of the entire head. [Structure] By forming a portion of the core 11 near the gap G in the non-magnetic substrate 13 from a glass material 16, the multilayer magnetic film 12 and the non-magnetic substrate 1 with respect to tape running are formed.
3 and the wear characteristics of the non-magnetic substrate 13 and the multilayer magnetic film 12 due to the running of the tape are substantially equal to each other, so that the area near the gap G is kept even after long-term use. It is always kept smooth.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

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

[0002]

[Prior art]

 Conventionally, in Japanese Laid-Open Patent Application No. 4-125806, there is known a magnetic head in which a pair of cores having a magnetic film formed thereon are arranged to face each other to form a predetermined gap. In a magnetic head using such a magnetic film, a so-called laminate type magnetic head has recently been developed, in which magnetic films are laminated in the track width direction.

In this laminated magnetic head, for example, as shown in FIGS. 3 and 4, a pair of cores 1 and 1 arranged to face each other so as to form a gap G are arranged in the track width direction. The laminated magnetic films 2 and 2 are film-formed, and the non-magnetic substrates 3 and 3 are arranged on both sides of each of the magnetic films 2 so as to sandwich the magnetic film 2 therebetween. The magnetic film 2 is formed by stacking a magnetic film and a non-magnetic layer, and the tape 4 is configured to run on the gap forming surface 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.

[0004]

[Problems to be solved by the device]

 However, in the laminated magnetic head having such a structure, the magnetic film 2 and the non-magnetic substrate 3 differ in the amount of wear caused by contact during tape running. More specifically, the former is slightly smaller than the latter. Therefore, as shown by the broken line in FIG. 4, spacing 7 may occur between the sliding surface portion of the magnetic film 2 and the tape 4. As a result, so-called gap loss increases, and the strength of the entire head decreases, which is a problem.

Therefore, the present invention aims to provide a laminated magnetic head having excellent wear resistance against tape running.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a magnetic head in which cores are arranged to face each other with a predetermined gap, and the core includes a plurality of sets in which a magnetic film and a non-magnetic layer are superposed in the track width direction. It has a multilayer magnetic film formed by stacking and a non-magnetic substrate arranged on both sides of the multilayer magnetic film, and a portion near the gap in the non-magnetic substrate is made of a glass material.

[0007]

[Action]

 With the means having such a structure, the amount of wear of the magnetic film near the gap and the amount of wear of the glass material are almost equal, and there is no spacing between the tape near the gap and after long-term use. Is always maintained smooth.

[0008]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIGS. 1 and 2, each of the pair of cores 11 and 11 arranged to face each other so as to form the gap G has a multilayer magnetic film 12 in the track width direction (vertical direction in FIG. 2). , 12 are stacked. Non-magnetic substrates 13 and 13 are arranged on both sides of each of the multilayer magnetic films 12 in the track width direction so as to sandwich the multilayer magnetic film 12, respectively. The tape is run on the surface of the substrate 13 on which the gap G is formed.

In addition, a coil window 14 having a substantially rhombic shape on the front is formed in a portion where the cores 11 and 11 face each other, and a recording / reproducing signal is input / output by passing through the coil window 14. A coil 15 for winding is wound around the core 11.

The multi-layered magnetic film 12 is formed by laminating a plurality of sets in which the magnetic film 12a and the non-magnetic layer 12b are superposed on each other in the track width direction. Among them, the magnetic film 12a is a ferromagnetic metal. For example, sendust or the like is used, and a glass material (SiO ₂ ) or the like is used as the nonmagnetic layer 12b. The magnetic film 12a and the non-magnetic layer 12b are formed to have a uniform film thickness by a known thin film forming technique such as sputtering or ion plating, and are formed as a whole in order to avoid magnetic saturation. It is formed with a sufficient film thickness.

On the other hand, as the non-magnetic substrate 13 of each core 11, 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 near 30 MHz, and when it is assumed that it is used up to a high frequency of about 5 MHz. Ferromagnetic oxides such as ferrite and sendust alloy, which have high magnetic permeability, are used.

On the other hand, a glass material 16 is embedded in the vicinity of the gap G in the non-magnetic substrate 13. The glass material 16 is made of a material such as SiO ₂ which has substantially the same wear resistance as that of the multilayer magnetic film 12, and thereby wear of the multilayer magnetic film 12 due to running of the tape and the glass material 16 are prevented. Wear is made almost equal.

As described above, in the present embodiment, the wear characteristics of the multilayer magnetic film 12 and the glass material 16 with respect to the tape running are substantially equal to each other. Therefore, the wear amount of the glass material 16 due to the running of the tape and the multilayer magnetic film. The wear amount is almost the same as that of No. 12, and the portion near the gap G is always kept smooth even after long-term use. As a result, the conventional spacing (see the broken line in FIG. 4) is prevented from occurring.

[0014]

[Effect of device]

 As described above, according to the laminate type magnetic head of the present invention, by forming the vicinity of the gap in the non-magnetic substrate from the glass material, the wear characteristic of the head against tape running is improved, and so-called gap loss is achieved. Can be prevented, the strength of the entire head can be improved, and the reliability of the laminated magnetic head can be improved.

[Brief description of drawings]

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

FIG. 2 is a plan view of the laminated magnetic head shown in FIG.

FIG. 3 is an external perspective view showing a general structure example of a laminated magnetic head.

FIG. 4 is a schematic end view of the laminated magnetic head shown in FIG.

[Explanation of symbols]

 11 core 12 multilayer magnetic film 12a magnetic film 12b non-magnetic layer 13 non-magnetic substrate 16 glass material G gap

Claims (2)

[Scope of utility model registration request] 1. A magnetic head in which cores are arranged so as to face each other with a predetermined gap in between, and the core is a multi-layer formed by laminating a plurality of sets in which a magnetic film and a nonmagnetic layer are superposed in the track width direction. A magnetic head comprising a magnetic film and non-magnetic substrates arranged on both sides of the multilayer magnetic film, wherein a portion near the gap in the non-magnetic substrate is made of a glass material. 2. The magnetic head according to claim 1, wherein the glass material is made of a material having substantially the same wear resistance as that of the multilayer magnetic film.