JPS58224420A - Magnetic head and its production - Google Patents

Abstract

PURPOSE:To produce easily a magnetic head, by joining both end surfaces having notched parts of a pair of cores to each other to form a window part, filling the opening part side of the window part with a glass layer and forming a soft magnetic layer having a magnetic gap on the upper surface of the glass layer. CONSTITUTION:A Mn-Zn polycrystalline ferrite core 1 is formed like a strip, a groove is cut out to form a U-shaped core 1 and then the opening part of the groove is filled with glass 2. In this case, a winding window 3 is opened and an opening surface 4 is polished to be smoothed. Subsequently, an amorphous film 5 consisting essentially of Co-Nb is formed on the opening surface 4 at about 30mu thickness by a high-frequency sputtering method. In order to form a track format mask on the surface of the amorphous film 5, the film 5 is partially removed, holes 6 are cut and filled with glass 7 having a low melting point and the surface of the film 5 is also coated with the glass 7. The core block 1 prepared by said procedure is cut off along its center line and the cut surfaces are polished smoothly. Subsequently, SiO2 is formed on the polished surfaces as a gap spacer 9 by the sputtering method and the right and left cores are butted again and adhered by the remelting of the low melting point glass 7. The adhered core 1 is cut off to each chip unit to complete a magnetic head.

Description

[Detailed description of the invention] The present invention relates to a magnetic head and a method of manufacturing the same.

Although the recent trends in high-density recording technology have been remarkable,
Improvements in magnetic tape have been cited as a contributing factor to this, and improvements in its coercive force are prompting a change in magnetic head materials. In other words, when we look at video recording heads, which are representative of current short-wavelength recording magnetic heads, glass-molded ferrite heads are currently mainstream due to their wear resistance and reliability of the magnetic gap. That's right,
The maximum magnetic flux density Bm of ferrite is at most 5000 Gauss, and for magnetic tapes whose coercive force exceeds 10 oOersted, magnetic saturation of the core causes a decrease in recording efficiency. What is proposed here is a metallic magnetic material with a higher maximum magnetic flux density Bm than ferrite.

Sendust and Alper 3 Basem are considered candidates, but both have the fatal defect of low wear resistance.

Therefore, various compositions and amorphous magnetic materials that can be selected arbitrarily are being considered, and materials that themselves have wear resistance similar to that of ferrite are emerging. However, amorphous magnetic materials cannot be obtained as a bulk material due to the manufacturing process, and can only be obtained in the form of a ribbon, d1, or thin film, and therefore it has been extremely difficult to manufacture magnetically.

The present invention has been devised in view of the above-mentioned two conventional problems, and provides a method for manufacturing a magnetic head using a soft magnetic film, particularly an amorphous thin film, and a magnetic head constructed from the amorphous thin film.

Next, embodiments of the present invention will be described in detail with reference to the drawings.

First, as shown in Fig. 1, a Mn-Zn polycrystalline ferrite core 1 is made into a tanzag shape, a groove is cut into the core 1 so that it becomes U-shaped, and the opening of the groove is filled with glass 2. A7
do.

At that time, the winding window 3 used in the subsequent process is not filled with glass. Then, the opening 4 of the core is polished sufficiently flat.

Next, as shown in FIG.
The amorphous film 5 whose main component is a high frequency substrate 5. 6 Next, as shown in FIG. 3, a mask of 30 μm is created on this amorphous film 5, and the required thickness is formed by drying and notching. Create a track shape. In other words, in FIG.
Next, as shown in FIG. 4, in order to fill the hole 6, a low melting point glass 7 is filled at a temperature lower than the crystallization temperature of the amorphous film 5, and the upper surface of the amorphous film 5 is covered ( overcoat).

Next, as shown in FIG. 5, the core block 1 on which the low melting point glass 7 is formed is cut along the center line, and the cut surface 8
is sufficiently flattened, 6Pe-Nino S 102 is formed on the polished surface as a gap spacer 9 by battering, the separated left and right cores are butted together, and by remelting the low melting point glass 7, the left and right cores are separated. Glue. At this time, the low melting point glass 7 diffuses not only into the low melting point glass but also into the initially molded glass 2 through the etching holes 6, and the left and right sides of the glass 2 are remelted, increasing the bonding strength.

The subsequent process is similar to the processing method for normal ferrite video heads, in which each chip is individually cut, and the front surface of the head is polished to a specified gap depth (in this case, the gear knob depth is equivalent to the amorphous film thickness). ) The magnetic head is completed as shown in FIG.

In the magnetic head shown in FIG. 6, a window 3 is formed by joining the cutout end faces of a pair of cores 1 and 1', and a glass layer 2 is filled on the opening side of the window 3. A soft magnetic amorphous film 5 having a spacer 9 for a magnetic gap is formed on the upper surface of a glass layer 2.

1. As is clear from FIG. 6, the tape sliding surface is formed of an amorphous film 5 and an etched hole 6 filled with low melting point glass 7, and the low melting point glass in the etching hole 6 is formed on the tape sliding surface. Since the upper surface of the amorphous film 5 is a convex portion and the upper surface of the amorphous film 5 is a convex portion, there is no problem with the opening. After forming a molding pattern on the glass 2 formed at the opening of the groove of the core 1, the mold glass 2 re-melts due to the diffusion of the low melting point glass, making strong adhesion possible, and the tape runs. It is possible to form a highly reliable gear knob that does not collapse even under certain conditions. The winding window 3 is not yet filled with glass, and winding can be easily performed.

These advantages are achieved by manufacturing the magnetic head of the present invention in which the opening of the groove of the U-shaped core is filled with glass, the opening is made into a closed magnetic path with an amorphous film, and a track pattern is formed on the glass. By adopting this method, there will be no problem during subsequent gap formation due to splitting and remelting. In addition, the magnetic head of the present invention obtained by the same method has a uniform 7-page quality material made of a soft magnetic film formed on the tape sliding surface, and has a magnetic gap with excellent durability and strength. It is.

[Brief explanation of the drawing]

1, 2, 3, 4, and 5 are perspective views for explaining a method of manufacturing a magnetic head according to an embodiment of the present invention, and FIG. 6 is an embodiment of the present invention. FIG. 1...U-shaped ferrite core, 2...
Filled glass, 3s@same wire wound window, 4.0Il.
・Amorphous surface, 5 ””...Amorphous film, 6-...Etched hole, 7...Low melting point glass, 8...Gear knob surface, 90...e gap spacer. Name of agent: Patent attorney Toshio Nakao and 1 other person @1
figure

Claims (1)

[Claims] (1) The end faces of a pair of cores having notches are joined to form a window, a glass layer is filled on the opening side of the window, and a magnetic gear is placed on the top surface of the glass layer, and two plate A magnetic head on which a soft magnetic film is formed. A magnetic head according to claim 1, characterized in that the soft magnetic film is made of soft magnetic amorphous. After forming a hole for forming a track pattern in the soft magnetic film, the hole in the soft magnetic film is filled with low melting point glass, the U-shaped core is divided, and the magnetic gear is closed. A method of manufacturing a magnetic head characterized by rejoining split cores through glass.(Claim 1) Claim 1, characterized in that the soft magnetic film is formed by sputtering soft magnetic amorphous. 3. The method for producing a magnetic helide according to item 3.