JPS5945630A - Production of magnetic head - Google Patents

Abstract

PURPOSE:To obtain highly precise gap length and to ensure perfect junction, by forming a metallic magnetic material, by sputtering the surface opposite to a magnetic tape at the side opposite to a main core and at the same time forming a gap spacer by sputtering on the surface orthogonal to the metallic magnetic matter. CONSTITUTION:The nonmagnetic glass 2 is filled to a corner of a ferrite block 1, and lands 3-1, 3-2... are formed to recessed and projected parts to control the track width 4. Then an amorphous magnetic alloy is sputtered from the direction of an arrow A to form a magnetic layer 7 on a surface 5 of the block 1 containing the lands. A surface 6 orthogonal to the surface 5 is polished to remove the sags at the edge of a sputtering surface, and the desired thickness is obtained for SiO2 by sputtering to form a gap spacer 8. The block 1 having no magnetic layer 7 and a core block 1' are butted and joined together, and then a magnetic material equal to the layer 7 is vapor-deposited again to form a magnetic layer 9 which covers the layer 7, a gap 8 and the surface 5', respectively. Then the block is divided into heads after forming a tape sliding surface by polishing. In such a way, a high-density recording head having a highly precise gap 8 is produced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for manufacturing a magnetic head, and provides a method for manufacturing a magnetic head for high-density recording, such as a video head.

Conventional configuration and its problems Video heads, which are at the cutting edge of technology as magnetic heads for high-density recording, are currently limited by the coercive force of the tape used.
Due to its reliability, heads using ferrite cores were the mainstream. However, with the recent move toward higher density in magnetic heads, the coercive force of tape has further increased.
It has become more than 000 oersted. As the coercive force of the tape increases, the recording head must generate a stronger recording magnetic field, and current ferrite heads have a maximum magnetic flux density of about 60,000 el, and in the case of a narrow gap, the magnetic flux density of the core near the gap increases. Due to magnetism, it is not possible to generate a sufficient recording magnetic field.

Therefore, metal magnetic materials with high maximum magnetic flux density were considered as materials for magnetic heads, and the use of sendust and amorphous alloys was considered, but due to their workability and the form of the materials, these were not used as video heads. It has been difficult to put a magnetic head with sufficient reliability into practical use.

One of the factors hindering reliability is the reliability problem of the magnetic gap. The reliability of the magnetic gap is entirely a matter of adhesion technology, and the reason why the reliability of conventional ferrite heads is high is that the Fequi 1 core is made of low melting point glass and the fusion bonding is +iJ. On the other hand, in the case of metal magnetic materials, adhesion with glass as in the case of ferrite causes d-corrosion. This is more difficult in terms of thermal expansion coefficient, and bonding means using silver solder is effective for bonding the core, but when forming gaps, considering the accuracy of the gap length formed, silver solder is It is very difficult to form a magnetic gap that is fused by

Purpose of the Invention The present invention eliminates the above-mentioned conventional drawbacks, and provides a method for manufacturing a highly reliable magnetic head in which a magnetic metal material is formed by sputtering and the magnetic gap is completely joined by taking advantage of its characteristics. Make it your first priority to do so.

Components of the Invention In other words, the method for manufacturing a magnetic head of the present invention includes the steps of forming a magnetic film on one surface of the half pair of the main core, and polishing a gap surface different from the above-mentioned - surface of the f'+iJ main core. After forming a gear/knob spacer made of a non-magnetic material on the same gap surface and butt-joining the half pair of the main cores with the other half pair of the main cores, the surface on which the magnetic film is provided is made magnetic again. The method includes a step of forming a film and a step of polishing the magnetic film to form a tape sliding surface.

Description of examples The present invention will be explained in detail below with reference to Examples.

In FIG. 1, one corner of a ferrite block 1 is filled with non-magnetic glass 2, and lands 3-1, 3-2, 3-3, 3-4, etc. that regulate the track width 4 are shown.
- is formed into a convex shape. Next, as shown in FIG. 2, an amorphous alloy is slopped onto the surface 5 on which the land is formed in the direction of the arrow to form a magnetic layer 7. 1. FIG. 2 shows a cross section through the track width 4 shown in FIG.

Next, a surface 6 perpendicular to the sputtering surface 5 is polished into a flat surface. This removes the blurring at the edges of the vine surface.

Next, as shown in FIG. 3, a gap spacer 8 5102 is formed on the polished surface 6 by sputtering to a desired thickness for a desired gear tooth length. Thereafter, as shown in FIG. 3, one end of the sputtered film was polished and a gearsopus baser was provided on the core 1, and the other was a core 1' with a magnetic layer formed by sputtering and a land with a chair 1-rack regulation. , the sputtered surfaces 5 and 6' are brought into substantially alignment and butt-joined.

Furthermore, as shown in FIG. 4, the amorphous alloy is again sputtered in the direction of the arrow to form the magnetic layer 9. The magnetic layer 9 sputtered here is sputtered so as to overlap the previously sputtered magnetic layer 7 and also wrap around the gap spacer 8 formed therein.

Next, the surface on which the magnetic layer 9 has been sputtered is polished into a form for tape sliding and cut at the respective trunk widths to complete the heel and bottom, and the magnetic head shown in FIG. 5 is obtained.

According to the method of this embodiment, the gap length is correctly defined by the thickness of the gap spacer formed by sputtering, so that the gap can be obtained with very high precision. Moreover, the obtained magnetic head is sufficiently strong.

In this embodiment, an amorphous alloy is used for the magnetic thin film, but this is because it is very effective when an amorphous material is used. In other words, in the case of an amorphous alloy, is crystallization a characteristic of the material? i+i! However, in the manufacturing method according to this embodiment, the heat treatment applied to the amorphous thin film is only during butt joining of the main core block, so the joining using low melting point glass is possible. The reduction of heat treatment during bonding makes it easy to form a head.

Note that the magnetic thin film is not limited to amorphous materials, but crystalline alloys such as Sendas 1- can also be used.

Although an embodiment using ferrite as the main core has been described, it is clear that the same effect can be obtained even if the main core is made of sendust, a metal magnetic material, or an amorphous alloy.

However, when ferrite is used as the main core, the advantage is that the left and right core blocks can be bonded together using low melting point glass at around 400°C; when the main core is made of a magnetic metal such as sendust, If the main core blocks are joined using silver solder or soft filler metal, it is possible to join low r products.

Effects of the Invention As described above, the method for manufacturing a magnetic head of the present invention involves forming a magnetic film on one surface of the half 11 of the main core. and forming a gap spacer made of a non-magnetic material on the same gap surface, and after butting and joining the half pair of main cores with another half pair of main cores, the surface on which the magnetic film is provided. A magnetic head with a high-precision magnetic gap using a metallic magnetic material can be obtained by forming a magnetic film again on the tape and polishing the magnetic film to form a tape sliding surface.

[Brief explanation of the drawing]

1 to 6 show each process of manufacturing a magnetic head according to an embodiment of the present invention. FIG. 1 is a perspective view of a main core block provided with a trunk restriction, and FIG. Later main core pro, sectional view within rack width from 1 to tsuku, 3rd
The figure is a cross-sectional view within the 1-rank width of the main core block after the left and right core blocks are butt-jointed, Figure 4 is a cross-sectional view within the trunk width of the main core block after secondary sputtering, and Figure 6 is the completed head. FIG. 3 is a perspective view of the chip. 1.1'...Half pair of main core, 2,2'...
・Glass, 3-1.3-2.3-3.3-4...
・Land, 4...1-Rack width, 5,6'...
... Suhanota side, 6... Gear Tsubu side, 7...
...Magnetic layer, 8...Gap spacer, 9
...Magnetic layer. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 4 Figure 1' Figure 5

Claims (1)

[Claims] a step of forming a magnetic film on one surface of the pair of main core halves; a step of polishing a gap-forming surface different from the negative surface of the main core and forming a gap spacer made of a non-magnetic material on the same gap-forming surface; After butt-joining the half pair of main cores with another half pair of main cores, a ladle' is used to form a magnetic film again on the surface on which the magnetic film is provided, and the magnetic film is polished and tape-printed. A method for manufacturing a magnetic spatula, characterized by having a step of forming a moving surface.