JPH05151518A - Magnetic head and production thereof - Google Patents

Abstract

PURPOSE:To provide the magnetic head which is constituted to prevent work strains at the time of forming winding windows from extending to magnetic metallic material layers in the magnetic head having the structure to hold the magnetic metallic material layers with a pair of nonmagnetic substrates and the process for production thereof. CONSTITUTION:This magnetic head is constituted by joining and integrating a pair of cores 4, 5 consisting of the magnetic metallic material layers 2 held between the nonmagnetic substrates 3, 3 in such a manner that the magnetic metallic material layers 2 face each other, forming a magnetic gap g on the peak end face 6 thereof and forming the 1st winding window 13a of the magnetic metallic material layer 2 and the 2nd winding window 13b of the nonmagnetic substrate 3 below the magnetic gap g. The 1st winding window 13a is formed to the shape larger by one size than the shape of the 2nd winding window 13b. The process for production thereof consists in depositing and forming the magnetic metallic material layer 2 on the nonmagnetic substrate 3 and previously boring and removing the magnetic metallic material layer 2 on the surface thereof to the shape larger by one size than the size of the 2nd winding window 13b, thereby forming the 1st winding window 13a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head and a method of manufacturing the same, and more particularly, to a laminated high-density recording magnetic head having a structure in which a metal magnetic layer having a high saturation magnetic flux density is sandwiched between nonmagnetic substrates and a method of manufacturing the same. It is about the method.

[0002]

2. Description of the Related Art A magnetic head used in a magnetic recording / reproducing device such as a VTR device or an FDD device is of a laminated type for realizing high density recording. An example of the magnetic head is shown in FIG. explain. The magnetic head (1) comprises a metallic magnetic layer (2) made of sendust and having a high saturation magnetic flux density.
(2) are non-magnetic substrates such as ceramics (3)
A pair of first and second cores (4) sandwiched by (3)
The metal magnetic material layers (2) and (2) are opposed to each other and integrated (5) by glass welding. Then, a magnetic cap (g) (gap length 0.3 to
0.5 μm) and the metal magnetic layers (2) and (2) and the non-magnetic substrate (3) below the magnetic gap (g).
A through hole orthogonal to (3) is formed to form a winding window (7), and a winding (8) is wound around each of the first and second cores (4) and (5).

[0003] In the production of the laminated magnetic head (1), first the joint surface of FIG. 5 rectangular parallelepiped nonmagnetic substrate made of calcium titanate (CaTiO ₃₎ shown in (a) (3), 5 ( As shown in b), a metal magnetic layer (sendust) (2) is deposited by sputtering, vapor deposition or the like to a thickness of 5 or 12 μm (corresponding to the track width of the magnetic gap). Next, as shown in FIG. 5 (c), a plurality of non-magnetic substrates (3) are laminated with the metal magnetic layer (2) sandwiched between them and glass-welded at 500 to 600 ° C. The first and second core blocks (9) and (10) are formed by halving them in the longitudinal direction along the chain line. Therefore, FIG.
As shown in (d) and (e), each core block (9) (1
The groove portions (7a) and (7b) for the winding windows are respectively formed on the joint surfaces of (0).
And the groove (7a) as shown in FIG. 5 (f).
The head block (11) is formed by abutting (7b) and fusing together with glass. Then, the magnetic head (1) is obtained by cutting each chain line into a predetermined shape and polishing the entire top surface (6).

[0004]

The problem to be solved is the non-magnetic substrate (3) at the joint surface of the first and second core blocks (9) and (10) during the manufacture of the magnetic head (1).
And the metal magnetic material layer (2) are mechanically directly cut by a rotating blade or the like to form the winding window groove portions (7a) and (7b)
Since it is drilled, the cut surface, that is, the groove (7a)
This is the point that processing strain (processing damage) remains on the surface of (7b) up to a depth of several μm. In this case, in a hard disk or a VTR, since the magnetic gap depth is about 5 to 20 μm, the processing strain extends to the vicinity of the winding window, which is an important magnetic path, especially near the gap, and the magnetic permeability decreases, and at the same time, the magnetic permeability of the head decreases. Recording / reproducing characteristics deteriorate.

[0005]

According to the present invention, as a magnetic head, a pair of cores formed by sandwiching a metal magnetic material layer having a high saturation magnetic flux density between nonmagnetic substrates are joined together with the metal magnetic material layers facing each other. The first winding window in which the first winding window of the metal magnetic material layer and the second winding window of the non-magnetic substrate are formed under the magnetic gap, while integrally forming a magnetic cap on the top surface thereof. Is formed to be slightly larger than the shape of the second winding window,

As a manufacturing method thereof, a metal magnetic material layer having a high saturation magnetic flux density is deposited on the surface of the non-magnetic substrate, and the metal magnetic material layer at the center of the surface is formed on the non-magnetic substrate as a second layer. A step of forming the first winding window of the metal magnetic layer by hollowing and removing it by, for example, chemical etching or the like by a method that does not deteriorate the metal magnetic layer to a shape slightly larger than the winding window, and After the magnetic substrates are laminated with the metal magnetic layer sandwiched therebetween and bonded and integrated, the magnetic substrate is orthogonal to the metal magnetic layer and is divided into two in a plane including the first winding window to form first and second cores. Step of forming block, first and second
Forming a second winding window of a non-magnetic substrate by forming a groove in one or both of the core blocks, and joining the first and second core blocks by abutting the winding windows to form a head block. And a step of cutting and molding the head block into a predetermined shape to form a magnetic head.

[0007]

According to the above technical means, the first winding window can be formed by a method that does not deteriorate the metal magnetic layer, and when the second winding window is formed, the first winding window is formed on the metal magnetic layer. Since the mechanical cutting process is not applied, it is possible to process the winding window without leaving machining strain in the metal magnetic layer.

[0008]

Embodiments of a magnetic head and a method of manufacturing the same according to the present invention will be described below with reference to FIGS. First, FIG. 1 and FIG. 2 show an exploded perspective view and an enlarged front view of an essential part of a magnetic head (12) according to the present invention, and the same parts as those shown in FIG. Is omitted. The difference is the shape of the winding window (13). The shape of the first winding window (13a) provided on the metal magnetic layer (2) is the same as the shape of the second winding window provided on the non-magnetic substrate (3). It is formed to be slightly larger than the shape of (13b).

That is, in the manufacture of the magnetic head (12), as shown in FIG. 3, the metallic magnetic layer (2) is deposited on the non-magnetic substrate (3) by sputtering or the like (FIG. 5 (b)).
The metal magnetic layer (2) in the substantially central portion of the surface of the nonmagnetic substrate (3) by a masking method in advance.
Of the second winding window (13b) is hollowed out and removed at a constant pitch to form the first winding window (13a). Alternatively, after the deposition of the metal magnetic layer (2), the first winding windows (13a) are similarly formed chemically or physically by etching using an ion beam or the like. These hardly cause processing strain to remain in the metal magnetic layer. Next, as in the conventional process shown in FIG. 5C, a plurality of non-magnetic substrates (3) ... Are laminated with the metal magnetic layers (2) ... The first and second core blocks (9) and (10) are divided into two equal parts in the direction. Therefore, similar to the conventional process shown in FIGS. 5D and 5E, the groove portions (13c) (13d) (which become the second winding windows (13b) are formed on the joint surfaces of the core blocks (9) and (10). Figure 5
When the grooves (7a) and (7b) of (d) and (e) are formed), the first winding window (13a) becomes the second winding window when bored by mechanical cutting with a rotating blade or the like. Since it is slightly larger than that of (13b), processing strain is generated in the first winding window (13b).
Since it does not reach to a), processing strain does not remain in the metal magnetic layer (2). Further, similarly to the conventional process shown in FIG. 5 (f), the groove portions (13c) and (13d) are butted and glass-welded together to form a head block. Then, the magnetic head (12) is obtained by cutting it along each chain line shown in FIG. 5 (f) to form it into a predetermined shape and polishing the entire top end face (6).

[0010]

According to the present invention, a pair of cores in which a metal magnetic layer is sandwiched between non-magnetic substrates are joined and integrated with the metal magnetic layers facing each other, and a magnetic cap is formed on the top end face thereof. A magnetic head in which a first winding window of a metal magnetic material layer and a second winding window of a nonmagnetic material substrate are formed by forming a through hole perpendicular to the metal magnetic material layer and the nonmagnetic substrate below the magnetic gap. , The shape of the first winding window was made larger than the shape of the second winding window in advance at the time of its manufacture, and was formed without residual strain. Therefore, when cutting the second winding window, Since the processing strain does not reach the first winding window and the processing strain does not remain in the metal magnetic layer, the magnetic permeability is reduced around the winding window, which is an important magnetic path, especially in the vicinity of the gap, and the recording / reproducing characteristics of the head. Can be prevented.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of essential parts showing an embodiment of a magnetic head according to the present invention.

FIG. 2 is an enlarged front view of an essential part showing an embodiment of a magnetic head according to the present invention.

FIG. 3 is a perspective view of a main process step showing an embodiment of a method of manufacturing a magnetic head according to the present invention.

FIG. 4 is a perspective view showing an example of a conventional magnetic head.

5A to 5F are perspective views of respective steps showing an example of a conventional magnetic head manufacturing method.

[Explanation of symbols]

 2 metal magnetic layer 3 non-magnetic substrate 4 first core 5 second core 6 top end face 13 winding window 13a first winding window 13b second winding window g magnetic gap

Claims (2)

[Claims] 1. A pair of cores, which are formed by sandwiching a metal magnetic layer having a high saturation magnetic flux density between nonmagnetic substrates, are joined and integrated with the metal magnetic layers facing each other, and a magnetic cap is formed on the top end face thereof. In addition, in the case where the first winding window of the metal magnetic layer and the second winding window of the non-magnetic substrate are formed below the magnetic gap, the shape of the first winding window is larger than that of the second winding window. A magnetic head characterized by being formed slightly larger. 2. A metal magnetic material layer having a high saturation magnetic flux density is deposited on the surface of the non-magnetic substrate, and the metal magnetic material layer in the center portion of the surface is formed more than the second winding window of the non-magnetic substrate. After a step of hollowing and removing the metal magnetic material layer to form a first winding window having a size larger than that of the metal magnetic material layer, and laminating a large number of the non-magnetic substrates with the metal magnetic material layer sandwiched therebetween, and joining and integrating them, A step of forming a first core block and a second core block by dividing the surface in a plane including the first winding window while being orthogonal to the metal magnetic layer, and a groove portion in one or both of the first and second core blocks. To form a second winding window, to form a head block by joining the first and second core blocks by abutting the respective winding windows, and cutting the head block into a predetermined shape. .Magnetization characterized by including a step of forming to form a magnetic head Qi head manufacturing method.