JPS60243808A - Production of magnetic head - Google Patents

Abstract

PURPOSE:To obtain a narrow-track magnetic head having high reliability while preventing staggered butting by laminating core materials having the thickness larger than the required track width and cutting the laminated core materials in such a manner that the laminated surfaces remain. CONSTITUTION:Soft magnetic materials 1 which are thin sheet metals having the thickness T0 larger than the required track width Tw are laminated via insulating layers 2 to obtain a laminated block B1. The block B1 is cut at a cutting surface d1 to form a laminated block B2. A hollow groove 4 for winding running in the lamination direction of the materials 1 is formed to one B'2 of the block B2. The cut surface on the groove 4 for the window of wiring side of the block B'2 and the cut surface of the other block B2 are butted and adhered to each other via a gap material layer 5 and the adhered block is cut to obtain laminated blocks B3, B3. The block B3 is cut at the two cutting surfaces d2, d2 having the spacing corresponding to the required track width Tw in such a manner that the layers 2 remain. The magnetic head core H is thus obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a magnetic head, and more particularly to a method of manufacturing a narrow track head formed by laminating thin plate-shaped core materials.

[Prior art]

For example, it is well known that in a conventional magnetic head using a metal soft magnetic material, high frequency loss occurs due to eddy current loss in a high frequency region, and reproduction efficiency decreases due to deterioration of magnetic permeability.

As a countermeasure against this problem, there is a method of laminating core materials made of metallic soft magnetic materials. However, as the track width of the magnetic head becomes narrower with higher density recording, this method becomes difficult.

Therefore, a method can be considered in which the core material is made thinner and laminated to compensate for the narrower track width, but this method makes the core material too thin and difficult to handle, and tends to cause misalignment of the head gap, making it difficult to use. On the other hand, when the gap has an azimuth, there is a great possibility that misalignment will occur in the butt, making it difficult to achieve the accuracy of the gap width and the linearity of the gap, as well as lacking in mass production.

[Purpose of the invention]

The present invention aims to solve such conventional drawbacks by laminating core materials having a thickness greater than the required track width, and cutting the laminated block so that the laminated surface remains. Therefore, it is an object of the present invention to provide a method for manufacturing a narrow track magnetic head that is highly mass-producible, less likely to cause misalignment of the gap portion, and highly reliable.

〔Example〕

Hereinafter, the means taken in the present invention to achieve the above object will be illustrated and explained by way of examples. 1 to 8 are diagrams for explaining the manufacturing process of a magnetic spatula F according to an embodiment of the present invention, and in each figure, the same reference numerals indicate the same or corresponding parts.

An embodiment of the method for manufacturing a magnetic head according to the present invention includes the following five steps.

In the first step, as shown in FIG. 1, a plurality of sheets of thin metal soft magnetic material 1 (hereinafter referred to as core material 1) having a thickness To larger than the required track width Tw are prepared as shown in FIG. As shown in FIG.
Next, as shown by the solid line 3 in FIG. 3, laser bonding is performed using a plurality of laser bonding sections to obtain a first laminated block B1.

The laminated surfaces of the core material 1, that is, both surfaces, are lapped in advance. The insulating layer 2 is formed on one or both sides of the core material 1 by sputtering 5i02, for example, or by oxidizing it.

The laser bonded portion 3 must remain in the second laminated block B2-1 and the third laminated block B3 obtained by cutting in subsequent steps, so that the bonded state of each block must be maintained at all times. Provide multiple locations.

In the second step, the first laminated block B1 is cut at a first cut surface d as shown by the broken line in the lamination direction of the core material 1 in FIG.
, to obtain the second laminated block B2.

At least one cut surface of the obtained second laminated block B2 is lapped.

In the third step, at least one of the two second laminated blocks Bz, B'2, is provided with a concave groove for a winding window running in the laminating direction of the core material 1, as shown in FIG. 4
This is the process of forming. In this embodiment, since the width of the core material 1 is wide, two core materials are formed.

In the fourth step, as shown in FIG. 5, the winding window groove 4 of the second laminated block B'2 is formed with the winding window groove 4.
Side lapped cut surface and other second laminated block B
The lapped cut surfaces of B'2. Glue Bλ,
This is a step of further cutting along the cut plane indicated by the broken line to obtain third laminated blocks B3 and B3 as shown in FIG.

The gap material layer 5 is formed by vapor depositing or sputtering a gap material. Adhesion is performed using inorganic adhesives such as silver solder or glass bonding, or organic adhesives such as epoxy adhesives.

In the fifth step, as shown in FIG. 7, two second cut surfaces d2. , d2 to obtain the magnetic head and core H. Note that the hatched portion Cw is an unnecessary portion.

FIG. 8 shows reinforcing members 6 bonded to both sides of the obtained magnetic head core H.

9 to 12 show partial modifications of the above embodiment.

FIG. 9 shows the result shown in FIG. 10 by setting the first cut surface d in the second step described above diagonally as shown by the broken line and cutting the first laminated block B1 diagonally. This figure shows an example in which the gap 5' of the magnetic head core H is provided with an azimuth.

Figure 11 shows an example in which only one concave groove 4 for the winding window is provided when the width of the core material l to be laminated is narrow, and the way the blocks are taken can be changed depending on the shape of the core material l. This shows that.

FIG. 12 shows the third laminated block B3 with the gap material layer 5
Prison on the side parallel to! This is an example in which the lamination strength is further increased by further laser bonding at the laser bonding portion indicated by Il 8.

As explained above, in the embodiment, the core materials L are laminated and joined by laser bonding to form the first laminated block B.
, so in the subsequent process, you just need to cut and process this to form the second . Third laminated block B2. B3 can be obtained and its handling becomes easy. In particular, in the butting in the fourth step, it is possible to accurately butt a plurality of core materials 1 at once.

Further, even when manufacturing a magnetic head having an azimuth in the gap, the first laminated block B is cut at the first cut surface d in the second step, as explained in FIGS. 9 and 10.
All you have to do is set it diagonally (d'/) and cut, and the butt can be done accurately as mentioned above.
There is no possibility of misalignment occurring at the abutting portion.

Moreover, since the first laminated block B is formed by laminating the core materials 1 and joining them by laser bonding, there are no restrictions on the bonding method when bonding the second laminated block B2. For example, as in the example, even if the bonding is done using silver solder or glass bonding, which requires heat,
The laser joint is not adversely affected by this.

Furthermore, since the core material 1 can be relatively thick, that is, the thickness equal to or greater than the track width Tw of the magnetic head plus the cutting width Cw (which may include a lap allowance), the core material 1 can be easily handled. This makes lamination work and butting work easier.

〔Effect of the invention〕

As detailed above, according to the present invention, since a method of laminating thin plate-like magnetic materials having a thickness greater than the required track width is adopted, lamination of magnetic materials, handling of laminated blocks, especially cutting thereof, It becomes possible to accurately butt the laminated blocks after processing and cutting, which improves strength and reliability, thereby increasing the mass productivity of magnetic heads.

[Brief explanation of drawings]

1 to 8 are diagrams for explaining one embodiment of the present invention,
Fig. 1 is a perspective view of a thin plate-shaped metallic soft magnetic material used in this example, and Fig. 2 is a perspective view of a thin plate-like metallic soft magnetic material used in this example. FIG. 3 is a perspective view showing how to cut the first laminated block, and FIG. 4 shows a recess for a winding window in one of the second laminated blocks obtained by cutting the first laminated block. FIGS. 5 and 6 are perspective views showing a state in which grooves are formed; FIGS. 5 and 6 are perspective views of a third laminated block obtained by bonding the second laminated block shown in FIG. The figure is a plan view of essential parts showing the cutting procedure of the third laminated block for cutting out the magnetic head core, and FIG. 8 is a perspective view showing the completed product of the magnetic head core. FIG. 9 is a diagram corresponding to FIG. 3 showing another method of cutting the first laminated block, FIG. Fig. 11 shows a second laminated block with only one concave groove for the winding window, a perspective view corresponding to Fig. 4, and Fig. 12 shows a third M-layer block in which the laminated strength is further increased by laser bonding. FIG. 6 is a perspective view corresponding to FIG. 6; ■---Thin metal soft magnetic material (core material) 2-m-Insulating layer d,, d', ---First cutting plane d2---Second cutting plane B1-m-First laminated block B2 ;B'2-m--Second laminated block BB--Third laminated block 4-11 Concave groove for winding window 5;5'--Gap material layer H-m-Magnetic head core patent applicant Canon Electronics Co., Ltd. Representative: Gi Marushima, 9Y, Shiken

Claims (1)

[Claims] Obtaining a first laminated block by laminating a plurality of thin plate-like magnetic materials having a thickness greater than a required track width, and cutting the first laminated block at a first cutting plane in the lamination direction of the magnetic materials. obtaining a second laminated block;
forming a winding window concave groove running in the lamination direction of the magnetic material on one surface of at least one of the two second laminated blocks; is located inside and adhered to necessary portions via a gap material layer to obtain a third laminated block;
A method for manufacturing a magnetic head comprising the step of cutting the third laminated block so that the laminated surface of the magnetic material remains at two second cutting planes that intersect with the lamination direction of the magnetic material to obtain a magnetic head core.