JPH0643809U - Magnetic head - Google Patents

Abstract

(57) [Summary] [Purpose] The output of a laminated magnetic head can be increased with a simple configuration. A multilayer magnetic film 12 is formed on the inner side in the depth direction orthogonal to the gap G so as to have a large width and a large capacity, and the capacity of the multilayer magnetic film 12 is substantially increased. The number of output magnetic fluxes is increased while setting the laminated width of the multilayer magnetic film 12 on the moving surface to be narrow according to the narrow track width or the like.

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, a magnetic head in which a certain gap is formed by arranging a pair of cores coated with a magnetic film so as to face each other has been proposed in Japanese Patent Laid-Open No. 4-125806. As a magnetic head using such a magnetic film, in recent years, a so-called laminate type magnetic head in which magnetic films are laminated in the track width direction has been developed.

In this laminated magnetic head, for example, as shown in FIG. 4, a pair of cores 1 and 1 arranged to face each other to form a gap G is 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 disposed on both sides of each of the magnetic films 2 in the track width direction so as to sandwich the magnetic film 2 therebetween. . The magnetic film 2 is a stack of a magnetic film made of a ferromagnetic material and a non-magnetic layer made of glass or the like, and a tape is formed on the gap forming surface of the magnetic film 2 and the non-magnetic substrate 3. It 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.

[0004]

[Problems to be solved by the device]

 However, in a magnetic head with such a magnetic film coating, the film width of the magnetic film is restricted according to the track width, etc., which makes it difficult to increase the number of output magnetic fluxes and high output. Is difficult to obtain. Particularly, in recent high density recording, the track width tends to be narrowed. To cope with the narrow track, it is necessary to improve the characteristics of the magnetic film while making the tape sliding surface narrow.

Therefore, an object of the present invention is to provide a laminated magnetic head capable of easily obtaining high output regardless of the width dimension of the magnetic film on the tape sliding surface.

[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 opposite to each other with a gap as a boundary. It has a multilayer magnetic film formed by stacking a plurality of layers, and is formed such that the multilayer width of the multilayer magnetic film in the track width direction becomes wider in the depth direction orthogonal to the gap. ing.

[0007]

[Action]

 In the means having such a structure, even when the width of the multilayer magnetic film on the tape sliding surface is set narrow according to the narrow track width, etc., the inner side in the depth direction orthogonal to the gap is formed. In, the multilayer magnetic film is formed so as to have a wide width and a large capacity, so that the capacity of the magnetic film is substantially increased. The magnetic resistance is reduced by increasing the capacity of this magnetic film, and as a result, the number of output magnetic flux is increased.

[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 so as to face each other so as to form the gap G is formed by laminating the multilayer magnetic films 12 and 12 in the track width direction. It is attached. Non-magnetic substrates 13 and 13 are arranged on both sides of each multilayer magnetic film 12 in the track width direction so as to sandwich the multilayer magnetic film 12, respectively. The magnetic film 12 and the non-magnetic substrate 13 are respectively disposed. The tape runs on the tape sliding surface which is the formation surface of the gap G (the upper surface in the drawing).

Further, a coil window 14 having a substantially rhombic shape on the front surface is formed at 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. The coil 15 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 beam sputter.

At this time, the laminated width of the multilayer magnetic film 12 in the track width direction is formed so as to widen in the depth direction orthogonal to the gap G. That is, the laminated width in the track width direction of the multilayer magnetic film 12 on the tape sliding surface (the upper surface in the drawing) is set to be relatively narrow in correspondence with the narrow track width, etc. The laminated width of the multilayer magnetic film 12 on the side) is gradually expanded corresponding to the depth amount, and the entire side surface is formed in a wedge shape with the center portion in the track width direction as a boundary. A method of forming the multi-layered magnetic film 12 while changing the stack width in the depth direction will be described later.

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 materials with high permeability such as ferrite and sendust alloys are used.

As described above, in this embodiment, the laminated width of the multilayer magnetic film 12 on the tape sliding surface is set to be narrow according to the narrow track width and the like, but the inside in the depth direction orthogonal to the gap G is set. On the side, the multilayer magnetic film 12 is formed so as to have a wide and large capacitance. Therefore, the capacitance of the multilayer magnetic film 12 is substantially increased, and the increase in the capacitance of the multilayer magnetic film 12 reduces the magnetic resistance and increases the number of output magnetic fluxes.

Two examples of methods for forming the multi-layer magnetic film 12 by changing the lamination width will be described below. In the structure shown in FIG. 2, first, the multilayer magnetic film 12 is laminated on the non-magnetic substrate 13 as shown in FIG. 2A, and the multilayer magnetic film 12 is obliquely formed as shown in FIG. 2B. Grind to form a tape. Then, as shown in FIG. 2 (c), a pair of films whose bonding surfaces are coated with bonding glass B are laminated symmetrically as shown in FIG. 2 (d). Then, side processing as shown in FIG. 2E and upper and lower surface processing as shown in FIG. 2F are performed, and a plurality of heads are obtained by cutting to a predetermined thickness as shown in FIG. A winding window is formed on each of these heads, and gap spattering and bonding are performed.

Next, in the structure shown in FIG. 3, first, as shown in FIG. 3A, the nonmagnetic substrate 13 is obliquely ground in advance to form a taper shape, and the multilayer magnetic film 12 is laminated thereon. Form a film. Then, as shown in FIG. 3B, the multilayer magnetic film 12 is obliquely ground, a bonding glass layer is formed on the film surface, and the pair of films are symmetrically bonded as shown in FIG. 3C. Then, the side surface processing and the upper and lower surface processing are performed to obtain the state of FIG. The subsequent steps are the same as those described above.

The present invention is not limited to the number of laminated multi-layer magnetic films, but can be similarly applied to those having other laminated numbers than those shown in each of the above embodiments.

[0017]

[Effect of device]

 As described above, in the magnetic head according to the present invention, the multilayer magnetic film is formed so as to have a wide and large capacitance on the inner side in the depth direction orthogonal to the gap, and the capacitance of the multilayer magnetic film is substantially reduced. Therefore, even if the laminated width of the multilayer magnetic film on the tape sliding surface is set narrow according to the narrow track width, etc., the output magnetic flux number can be easily increased, and The output can be obtained with a simple configuration.

[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 process explanatory view showing an example of a method of forming a magnetic head by changing the lamination width of a multilayer magnetic film.

FIG. 3 is a process explanatory view showing another example of the method of molding the magnetic head by changing the lamination width of the multilayer magnetic film.

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

[Explanation of symbols]

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

Claims (1)

[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 magnetic head comprising a multi-layer magnetic film, wherein the multi-layer magnetic film is formed so that the stack width in the track width direction becomes wider in the depth direction orthogonal to the gap.