JPH03242807A - Production of magnetic head - Google Patents

Abstract

PURPOSE:To decrease the magnetic resistance when there is a misregistration in a rear gap part by inserting and adhering a magnetic material of a metal oxide into the groove formed in the rear gap part. CONSTITUTION:This magnetic head is constituted of nonmagnetic substrates 1, multilayered magnetic metallic films 2, bonding agents 3, a winding groove 4, a magnetic gap 5, the groove 6 for insertion of the magnetic material of the metal oxide, and the magnetic material 7 of the metal oxide. Namely, the groove 6 for insertion of the magnetic material of the metal oxide is formed in the rear gap part and the magnetic material 7 of the metal oxide is inserted and adhered into this groove 6. This core block is cut to an adequate core thickness to complete the magnetic head. The opposite width of the core does not change and increases in this way even if there is the misregistration of the tracks. The magnetic resistance of the magnetic circuit of the magnetic head, therefore, decreases and the magnetic head having the excellent recording and reproducing efficiency is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head in a magnetic recording/reproducing device, and particularly to a method of manufacturing a magnetic head suitable for recording/reproducing in a high frequency range.

BACKGROUND OF THE INVENTION In recent years, with the increase in the density of magnetic recording systems, high coercive force media such as alloy powder tapes and metal-deposited tapes have been developed as recording media. Therefore, magnetic heads are being developed in which a magnetic core is made of a metallic magnetic material with a high saturation magnetic flux density.

Hereinafter, a conventional method for manufacturing this type of magnetic head will be described with reference to FIG.

First, a multilayer film 2 in which metal magnetic films and insulating films are alternately laminated is formed on one or both surfaces of a nonmagnetic substrate 1, and an adhesive 3 is formed on the opposite surface. Stack many of these,
A laminated block is formed by pressure heat treatment. (See Figure 5-(a)).

Next, a pair of strip-shaped core half blocks are cut out from the laminated block, and a mold groove is formed on the abutting surfaces.
After molding glass with a melting point lower than that of the bonding agent in this mold groove, a winding groove 4 is provided in one core half block (see FIG. 5-(b)), and a magnetic gap 5 is formed between the pair of core half blocks. The magnetic cap surface and the bonding surface forming the magnetic cap are polished smooth to form a gap material which is a non-magnetic material. Thereafter, the pair of core half blocks are butted together at their joint surfaces with a gap material interposed therebetween, and subjected to pressure heat treatment to form one core block. (See Figure 5-(C)). This core block was cut to a suitable core width, and the tape sliding surface was wrapped to a predetermined magnetic gap depth to complete a magnetic head.

As a specific example of such a structure, for example, Tokko Sho $3-
There is No. 155412.

However, in the above-described conventional magnetic head manufacturing method, the magnetic core is made of a multilayer film in which metal magnetic films and insulating films are alternately laminated. When the two butted core half blocks are joined together, the opposing width of the cores on the rear gap side becomes smaller due to the alignment of the tracks, which increases the magnetic resistance of the magnetic circuit of this magnetic head. was there.

- In order to eliminate the above-mentioned conventional drawbacks, the method for manufacturing a magnetic head of the present invention includes forming a groove in the rear gap portion,
A feature is that a metal oxide magnetic material is inserted into the groove and bonded.

Furthermore, according to the above configuration, a groove is formed in the rear gap portion, and a metal oxide magnetic material is inserted and bonded into this groove, so that the core width of this magnetic circuit becomes larger in the rear gap portion, even if the rear gap portion is Even if the eyes are misaligned at the gap,
While the cores are facing each other, the magnetic resistance can still be significantly reduced.

odor surrounding The present invention will be explained below with reference to the drawings.

1 and 2 are schematic explanatory diagrams for explaining a method of manufacturing a magnetic head according to an embodiment of the present invention. In the figure, 1 is a non-magnetic substrate, 2 is a metal magnetic multilayer film, and 3 is
4 is a bonding agent, 4 is a winding groove, 5 is a magnetic gap, 6 is a metal oxide magnetic material insertion groove, and 7 is a metal oxide magnetic material.

Next, a method of manufacturing the above magnetic head will be explained.

The method for manufacturing the magnetic head described above differs from the conventional manufacturing method for this type of magnetic head (see Figure 5), in which a pair of core half blocks are butted together via a magnetic gap material, and both core half blocks are joined together. Since the same steps are performed up to the step of obtaining the core block, the explanation will be omitted.

Therefore, as shown in FIG. 1, a metal oxide magnetic material insertion groove 6 is formed in the rear gap portion of the core block, and a metal oxide magnetic material 7 is inserted into the groove and bonded. This core block is cut to a suitable core thickness to complete a magnetic head as shown in FIG.

According to this embodiment, since the metal oxide magnetic material is inserted into the rear gap portion, the facing width of the cores does not change even if the track eyelids are misaligned, but it also increases, so that the magnetic head's magnetic The magnetic resistance of the circuit is significantly reduced, and a magnetic head with excellent recording and reproducing efficiency can be manufactured.

Furthermore, this method of reducing the magnetic resistance on the rear gap side is easy to operate because it only requires forming a groove in the rear gap portion and adhering the metal oxide magnetic material.

Tip Amount 2 FIGS. 3 and 4 are schematic explanatory diagrams for explaining a method of manufacturing a magnetic head according to a second embodiment of the present invention. In this embodiment, instead of the first embodiment, a metal oxide magnetic material insertion groove 6 is formed, a metal magnetic film 9 is deposited on the surface of the metal oxide magnetic material insertion groove 6, and then gold 5-6 metal is deposited on the surface of the metal oxide magnetic material insertion groove 6. Since this embodiment is the same as the first embodiment except that the oxide magnetic material 7 is inserted and bonded, the same parts will be described with the same reference numerals.

In this embodiment, in the first embodiment, the core on the rear gap side is composed of the metal magnetic multilayer film 2 and the metal oxide magnetic material 7.
The evaporation surface of the metal magnetic film 9 and the metal oxide magnetic body 7 are now bonded to each other, and the contact becomes larger.
Furthermore, magnetic resistance can be significantly reduced.

As explained above, in this invention, a metal oxide magnetic material is inserted into the groove formed in the rear gap part and bonded, so that the magnetic circuit has a larger core width in the rear gap part. The magnetic resistance is reduced, and as a result, a magnetic head with excellent recording and reproducing efficiency can be manufactured.

FIG. 3 is a perspective view showing the head; FIG. 3 is a perspective view showing the second embodiment; FIG. 4 is a perspective view showing the magnetic head made according to the second embodiment; FIG. FIG. 3 is a perspective view showing a method for manufacturing a head.

1... Non-magnetic substrate, 2... Metal magnetic multilayer film, 3... Bonding agent, 4... Winding groove, 5...・Magnetic gap, 6...Metal oxide magnetic material insertion groove, 7...
・Metal oxide magnetic material, 8...Glass, 9...Metal magnetic film.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention;
The figure shows the magnetic exhaust produced according to the first embodiment.

Claims (1)

[Claims] A step of forming a multilayer film in which metal magnetic films and insulating films are alternately laminated on one or both surfaces of a nonmagnetic substrate, and bonding a plurality of nonmagnetic substrates on which multilayer films are formed. A step of sequentially laminating and bonding through the core half blocks, and then cutting the core half blocks into strip-shaped core half blocks, with the cut surfaces of the core half blocks being the abutment surfaces,
forming a mold groove on this abutting surface, molding glass having a lower melting point than the bonding agent into the mold groove; forming a predetermined winding groove in the core half block after the pair of glass molds; A method for manufacturing a magnetic head comprising the step of polishing abutting surfaces of a pair of core half blocks, then abutting them via a magnetic gap material, and joining both core half blocks together to obtain a core block. 1. A method of manufacturing a magnetic head, comprising the steps of forming a groove in a rear gap portion of the head, inserting a metal oxide magnetic material into the groove, and bonding the metal oxide magnetic material.