JPH0785286B2 - Magnetic head core and method of manufacturing the same - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a magnetic head core having a magnetic gap formed by a bonding surface of a pair of half cores made of an oxide magnetic material, the magnetic head core having a magnetic gap width regulated by glass. Regarding the method.

“Prior Art and Its Problems” In this type of magnetic head core, conventionally, glass grooves are formed at predetermined intervals on the bonding surfaces of a pair of half core blocks, and the glass grooves are filled with glass before bonding. The surface was re-polished, and the pair of half core blocks were generally manufactured by the steps of aligning the glass grooves, joining them, and then cutting at a predetermined interval. However, this manufacturing process is complicated, especially the alignment of the glass grooves of the half core block is complicated, the lead time to completion is long, and the cost is high. This problem is greatly emphasized when a large variety of products are produced in small quantities.

"Object of the Invention" It is an object of the present invention to solve the problems of the conventional manufacturing method and to obtain a manufacturing method of a magnetic head core which can be manufactured by a simple manufacturing process. Another object of the present invention is to obtain a manufacturing method capable of easily manufacturing a magnetic head core having excellent wear resistance.

[Summary of the Invention] The method of the present invention is a conventional method for a pair of half core blocks
The idea of performing glass grooving and filling glass before joining was revised, and the idea of doing this after joining the half core block, and the sliding surface with the magnetic recording medium had as large an area of oxidation as possible. It was completed based on the idea of exposing the magnetic material to improve wear resistance.
That is, according to the present invention, a pair of half core blocks are joined, and a pair of glass grooves extending between the pair of half core blocks are formed at predetermined intervals on the sliding contact surface of the joined core block with the magnetic recording medium. The regular tracks having a magnetic gap between the glass grooves and the dummy tracks wider than the regular tracks are formed between adjacent pairs of glass grooves, and after filling the glass grooves with glass, the bonded core blocks are attached to the respective magnetic core chips. It is characterized in that it is cut so that at least the regular track, the glass groove, and the dummy track are exposed on the sliding contact surface with the magnetic recording medium. According to this manufacturing method, complicated work such as positioning of the half core block is not required, the magnetic head core can be manufactured extremely efficiently, and the dummy track is exposed on the sliding contact surface with the magnetic recording medium. A magnetic head core having excellent wear resistance can be obtained.

"Examples of the Invention" The present invention will be described below with reference to illustrated examples. FIGS. 1 to 6 show an embodiment of the method of the present invention. A pair of flat plate-shaped half core blocks HB made of an oxide magnetic material such as ferrite is polished first. The joint groove 21 of the winding groove 22 is formed on one joint surface 21 of the pair of half core blocks HB.
23 is formed, and the high melting point glass 24 is filled in the both grooves 22, 23. A groove 25 is formed on the high melting point glass 24 on the winding groove 22 side by a grindstone. In the half core block HB having the winding groove 22 and the joining groove 23, the joining surface 21 is repolished.

The above-mentioned pair of half core blocks HB are attached to the joint surface 21.
After a gap forming material such as SiO ₂ is attached, the materials are butted against each other, heated to the melting temperature of the high melting point glass 24, and glass bonded. Then, the pair of half core blocks HB are joined, and the high melting point glass 24 melted in the winding groove 22.
Has a smooth shape and adheres to the winding groove 22 and the peripheral surface of the joint surface 21.

In the method of the present invention, the pair of half core blocks HB are first joined in this manner to form the joined core block B, and the joined core block B slides against the sliding contact surface 26 with the magnetic recording medium. The glass grooves 27 are processed at predetermined intervals as described above. The glass grooves 27 are formed as a pair, and a regular track T is provided between the glass grooves 27 of each pair, and a dummy track DT is provided between the glass grooves 27 of an adjacent pair. The width l1 of the dummy track DT is set to about 1 to 5 times the width l2 of the regular track T. Width of magnetic gap 28 (track width) t
Is determined by the width l2 of the regular track T. Further, the glass groove 27 is not orthogonal to the joint surface 21. That is, it is inclined at a constant angle θ with respect to the direction orthogonal to the joint surface 21. The glass groove 27 is formed to a depth reaching the winding groove 22, and the winding groove 22 determines the depth of the magnetic gap.

Next, glass 29 is filled in the glass groove 27 as shown in FIG. The glass 29 has a lower melting point than the high melting point glass 24 to which the half core block HB is joined, and the high melting point glass 24 does not melt when heated to its melting temperature. Then, a winding groove 31 is formed on the side surface of the joint core block B, if necessary, and further, the glass 29 and the sliding contact surface are formed.
Repolish the surface of 26.

The joined core block B, which has been processed as described above, is then cut so that one magnetic head core has one magnetic gap 28. However, according to the present invention, the sliding contact surface 26 with each magnetic head core recording medium is formed. , Regular track T (magnetic gap 2
8), the block B is cut so that the glass 29 and the dummy track DT are exposed. Cutting line B- in FIG.
B'is an example of the cutting line, and width s is an example of the cutting width. When the cutting line BB ′ is inclined in the direction opposite to the glass groove 27 with respect to the direction orthogonal to the joining surface 21 (inclination angle α), the sliding contact surface 26 is provided with the above-mentioned three, that is, regular tracks. The T (magnetic gap 28), the glass 29, and the dummy track DT can be easily exposed. Depending on this cutting angle and the width l1 of the dummy track DT, the glass 29 is further exposed outside the dummy track DT.

When the dummy track DT is exposed on the sliding contact surface 26 in this manner, the dummy track DT is made of an oxide magnetic material such as ferrite and has better wear resistance than the glass 29, and therefore the resistance of the sliding contact surface 26 is improved. Abrasivity is improved as a whole.

Further, in the magnetic head core formed as described above, the width (track width) t of the magnetic gap 28 is uniquely determined by the interval between the paired glass grooves 27, so that a highly accurate track width can be obtained. Is possible. That is, as compared with the conventional product in which the glass grooves are separately formed on the left and right half core blocks HB and then the two are abutted against each other, the alignment accuracy does not essentially become a problem, and an extremely high precision track width is obtained. be able to.

[Advantages of the Invention] As described above, according to the method of manufacturing a magnetic head core of the present invention, a pair of half core blocks are joined and then a pair of glass grooves defining a magnetic gap width is formed on the sliding contact surface. Then, after filling the glass groove with glass, the joining block is cut to form a magnetic core chip.
Therefore, it is possible to obtain a method of manufacturing a magnetic head core having a small number of steps and a simple manufacturing process, and it is possible to obtain a highly accurate magnetic gap width without variations, without being affected by other factors. Further, the magnetic head core of the present invention includes a regular track forming a magnetic gap formed between a pair of glass grooves, a glass of a glass groove, and a glass groove of an adjacent pair on the surface contacting the magnetic recording medium. Since the dummy track is exposed, it is possible to obtain a magnetic head core having excellent abrasion resistance as a whole by increasing the area ratio of the oxide magnetic material having excellent abrasion resistance in the sliding contact surface.

[Brief description of drawings]

1 to 6 show an example of steps of a method for manufacturing a magnetic head core according to the present invention. FIGS. 1 to 4 and 6 are perspective views, and FIG. 5 is a plan view of a sliding contact surface. is there. HB: Half core block, 21 ... Bonding surface, 22 ... Winding groove, 23 ... Bonding groove, 24 ... High melting point glass, 26 ... Sliding contact surface, 27 ... Glass groove, 28 ... Magnetic Gap, 29 ... glass, 30 ... magnetic head core, 31 ... winding groove, T ... regular track, DT ... dummy track.

Claims (3)

[Claims] 1. A track width regulating glass groove formed on a sliding surface of a magnetic recording medium of a magnetic head core is inclined at a constant angle with respect to a gap line, and a regular track and a glass are formed on the sliding surface. A magnetic head core having a groove and a dummy track exposed. 2. A pair of half core blocks made of an oxide magnetic material are joined together, and a pair of glass grooves extending between the pair of half core blocks are provided at predetermined intervals on a sliding contact surface of the joined core block with a magnetic recording medium. And forming a regular track having a magnetic gap between the pair of glass grooves and a dummy track between the pair of adjacent glass grooves, filling the glass grooves with glass, and then joining the bonded core blocks to each magnetic core chip. 2. A method of manufacturing a magnetic head core, which comprises cutting so that at least a regular track, a glass groove, and a dummy track are exposed on a sliding contact surface with the magnetic recording medium. 3. The glass groove according to claim 2, wherein the glass groove is inclined at a constant angle with respect to the direction orthogonal to the joint surface of the pair of half core blocks, and the joint break of the joint core block is the joint surface. A method of manufacturing a magnetic head core, which is inclined in a direction opposite to the direction of the glass groove with respect to a direction orthogonal to the direction, and in which the width of the dummy track is wider than the width of the regular track.