JPH0638002U - Magnetic head - Google Patents

Abstract

(57) [Summary] [Purpose] A laminated magnetic head can be used stably for a long period of time without causing spacing in the vicinity of the gap. [Structure] By forming the multilayer magnetic film 12 so that the film thickness or density thereof gradually becomes thinner or higher toward the center side in the track width direction, the wear resistance of the multilayer magnetic film 12 can be improved in the track width direction. The wear amount of the multilayer magnetic film 12 is made substantially uniform in the track width direction by gradually improving the wear resistance in the center portion of the multilayer magnetic film 12 in the track width direction where wear is most likely to occur. And what.

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 Publication No. 4-125806, 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. As a magnetic head using such a magnetic film, in recent years, a so-called laminate type magnetic head has 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, 4 and 5, a pair of cores 1 and 1 opposed to each other so as to form a gap G is provided. The magnetic films 2 and 2 laminated in the track width direction are applied to the nonmagnetic substrates 3 and 3 so that the magnetic films 2 are sandwiched on both sides of each magnetic film 2 in the track width direction. Is provided. The magnetic film 2 is formed by stacking a magnetic film made of a ferromagnetic material and a non-magnetic layer made of glass or the like on the surface of the magnetic film 2 and the non-magnetic substrate 3 on which a gap is formed. Is configured to run. 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.

At this time, as shown in FIG. 3 in particular, each set of the magnetic film and the non-magnetic layer forming the magnetic film 2 is set to have the same film thickness and density. Each set having the same film thickness and density is laminated over a plurality of sets in the track width direction.

[0005]

[Problems to be solved by the device]

 However, in the laminated magnetic head having such a configuration, the magnetic film 2 and the non-magnetic substrate 3 are different from each other in the amount of wear caused by contact during tape running. More specifically, the former has a smaller amount of wear than the latter, but in particular, remarkable wear occurs in the central portion of the magnetic film 2 in the track width direction. As a result, as shown in FIG. 5, a spacing 7 having a substantially circular cross section may occur between the sliding surface portion of the magnetic film 2 and the tape 4. When such spacing 7 occurs, so-called gap loss increases and the information recording / reproducing function deteriorates.

Therefore, the present invention has an object to provide a laminated magnetic head having excellent wear resistance against running of a tape.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention is a magnetic head in which cores are arranged facing each other on both sides of a gap, and the core has 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 a set of layers, and the film thickness or density of each set in which the magnetic film and the non-magnetic layer in this multilayer magnetic film are superposed on the center side in the track width direction of the multilayer magnetic film. It has a structure that becomes thinner or higher toward the bottom.

[0008]

[Action]

 With each of the means having such a structure, the wear resistance at the center portion of the magnetic film, which is most likely to be worn, in the track width direction is improved, and the wear amount of the magnetic film is made substantially uniform in the track width direction. Become. Therefore, even after long-term use, the tape sliding surface is always kept smooth, and the conventional spacing between the tape and the tape near the gap hardly occurs.

[0009]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, a multilayer magnetic film 12, 12 is laminated in the track width direction (vertical direction in FIG. 1) on each of the pair of cores 11, 11 arranged so as to face each other so as to form the gap G. Has been done. 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 on which the gap G at 13 is formed.

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 by a known thin film forming technique such as sputtering, ion beam sputter or vapor deposition.

At this time, the respective sets in which the magnetic film 12a and the non-magnetic layer 12b in the multilayer magnetic film 12 are overlapped with each other are formed so as to have substantially equal densities. It is formed so as to become thinner toward the center side in the track width direction. That is, the magnetic films 12 on both ends in the track width direction are set to have a relatively thick film thickness, while the magnetic films 12 on the inner side are set to a slightly thin film thickness. The magnetic film 12 in the central portion in the track width direction is set to have the thinnest 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.

As described above, in this embodiment, the thickness of each set of the magnetic film 12a and the non-magnetic layer 12b in the multilayer magnetic film 12 is gradually reduced toward the center side in the track width direction. The wear resistance of the multilayer magnetic film 12 is gradually improved toward the center side in the track width direction, and the wear resistance in the center portion where wear is most likely to occur is the largest. Has been done. Therefore, the amount of wear of the multi-layered magnetic film 12 becomes substantially uniform in the track width direction, the tape sliding surface is always kept smooth even after long-term use, and the tape near the gap has a conventional gap. Little pacing.

Next, in the embodiment shown in FIG. 2, each set in which the magnetic film 12a and the non-magnetic layer 12b in the multilayer magnetic film 12 are overlapped is formed so as to have substantially the same film thickness. However, the density of each set is formed so as to gradually increase toward the center side in the track width direction. That is, the magnetic films 12 on both end sides in the track width direction are formed with a relatively coarse density, but the magnetic films 12 on the inner side thereof are formed slightly denser. The magnetic film 12 in the central portion in the track width direction is set to have the highest density. In the second embodiment as well, the wear resistance of the multilayer magnetic film 12 is gradually improved toward the center side in the track width direction, and the same action and effect as those of the first embodiment can be obtained. be able to.

In the above-described embodiment, the multi-layer magnetic film has five layers, but the present invention is not limited to the number of laminated multi-layer magnetic films, and it can be compared with other laminated films. However, the same can be applied.

Further, it is also possible to configure so that the film thickness and the density of each set in which the magnetic film and the non-magnetic layer in the multilayer magnetic film are overlapped are changed simultaneously toward the center side in the track width direction. .

[0017]

[Effect of device]

 As described above, in the laminated magnetic head according to the present invention, the multilayer magnetic film is formed such that the film thickness or the density thereof gradually becomes thinner or higher toward the center side in the track width direction. Since the wear resistance of the multilayer magnetic film is gradually improved toward the center side in the track width direction and the wear amount of the multilayer magnetic film is almost even in the track width direction, it is It can be used stably for a long period of time without causing any spacing between the two, and the reliability of the magnetic head can be improved.

[Brief description of drawings]

FIG. 1 is a horizontal cross-sectional explanatory view showing the structure of a laminated magnetic head according to a first embodiment of the invention.

FIG. 2 is a horizontal cross-sectional explanatory view showing the structure of a laminated magnetic head according to a second embodiment of the invention.

FIG. 3 is a horizontal cross-sectional explanatory view of a general laminate type magnetic head.

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

5 is a cross-sectional explanatory view of the general laminate type 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 G gap

Claims (2)

[Scope of utility model registration request] 1. A magnetic head in which cores are arranged opposite to each other with a gap as a boundary, and the core is formed by laminating a plurality of sets in which a magnetic film and a non-magnetic layer are superposed in the track width direction. A multilayer magnetic film is formed, and the thickness of each set of the magnetic film and the non-magnetic layer in the multilayer magnetic film is formed so as to become thinner toward the center side in the track width direction of the multilayer magnetic film. A magnetic head characterized in that 2. A magnetic head in which cores are arranged on opposite sides of a gap as a boundary, and the core is formed by laminating a plurality of sets in which a magnetic film and a non-magnetic layer are superposed in the track width direction. The multilayer magnetic film is formed so that the film density of each set in which the magnetic film and the non-magnetic layer in the multilayer magnetic film are superposed increases toward the center side in the track width direction of the multilayer magnetic film. A magnetic head characterized in that