JPS59171016A - Magnetic core and its manufacture - Google Patents

Abstract

PURPOSE:To set a small track width by joining a thin plate of a non-magnetic material to the side face of a substrate covered with a thin film of a high magnetic permeability magnetic material, forming a groove part at a prescribed pitch from on the thin plate, and thereafter, butting and joining said plate to the side face of a substrate on which a winding groove is formed, and cutting it. CONSTITUTION:A butted surface of a ferrite substrate 1 is finished to a plane and covered with a thin film 3 of a high magnetic permeability magnetic material. Subsequently, a reinforcing thin plate 12 of a non-magnetic material is joined onto the thin plate 3. Next, a groove part 4 is formed by a prescribed number by a machine work at intervals of a prescribed dimension Tw along one side edge in the longitudinal direction from on the thin plate 12. On the other hand, a winding groove 7 is formed on a non-magnetic material substrate 5, and a butted surface 6 is finished to a plane. Subsequently, the surface 6 and the upper face of the thin plate 12 are joined, by which a block 8' is obtained, and it is cut by a face which passes through the center of the groove part 4 and is orthogonal to the longitudinal direction of the block 8', and thereafter, a magnetic core simplex 10' is obtained by packing the groove parts 4, 4 with a packing material 9. Next, a magnetic core is completed by winding a magnet wire 11 round a substrate part 1' of the simplex 10' through a groove 7. In this way, a very small track width can be set.

Description

TECHNICAL FIELD The present invention relates to a magnetic core and a method for manufacturing the same, and more particularly to a magnetic core with a narrow track width used in perpendicular recording/reproduction type magnetism. , Prior Art Perpendicular recording/reproduction type magnetic disk drive is widely used in magnetic disk drives. The conventional manufacturing method and structure of the magnetic core of the magnetic throat are shown in Figures 1 to 6 and will be explained according to the manufacturing process. The surface of the 2nd surface is finished using a method that does not leave a machining fatigue layer to achieve flatness and surface roughness.

Next, a high magnetic permeability magnetic 4tit9 film (hereinafter referred to as thin film) 3 is formed to a predetermined thickness on this abutting surface 2 by a method such as vapor deposition or sputtering to cover the abutting surface 2.

Next, on one longitudinal side, along the strand, a predetermined dimension T is
A predetermined number of substantially semi-conical grooves 4 of the same size are formed at intervals of ω by machining. In this case the dimensions of the above spacing′
1゛ω becomes the track width dimension of the magnetic core at the time of completion 1- later.

On the other hand, what is indicated by reference numeral 5 in FIG. 4 is a non-magnetic phase substrate, which is made of non-magnetic ferrite, glass sesimink, or the like. This non-magnetic phase substrate 5 is a reinforcing material that prevents the edge of the thin film 3 with a narrow track width of 1 ω from being peeled off or deformed due to contact with the recording medium when the magnetic core is completed. It is.

This non-magnetic A-shaped plate 5 has an overall shape that is substantially the same as that of the ferrite substrate 1, and one side surface in the direction of the ferrite substrate 1 serves as a butting surface 6 with the ferrite substrate 1.

Along one side edge in the longitudinal direction of this abutting surface 6,
After forming the winding groove 7 as a recess for the subsequent winding, the abutting surface 6 is flattened.

Next, the abutting surface 6 of the non-magnetic material substrate 5 formed as described above and the abutting surface 2 covered with the thin film 3 of the noelite substrate 1 shown in FIG.
Obtain the book v1 shown.

Next, along the dotted lines a-a' and 1)-b' in FIG.
A bale cut on a plane perpendicular to the longitudinal direction, grooves 4 on both sides,
4 is filled with a filler material 9 made of adhesive or glass to obtain a single magnetic core 11 shown by reference numeral 91 1o in FIG.

Thereafter, as shown in FIG. 6, the magnet wire 11 is wound around the ferrite substrate portion 1' of the magnetic core unit 1o through the winding groove 7, thereby completing the magnetic core.

FIG. 7 is a partially enlarged view of the head surface, which is the sliding surface of the completed magnetic core with the recording medium. As shown in FIGS. 7 and 6, the structure of the completed magnetic core is such that a winding groove 7 is formed and the end surface of the non-magnetic ion substrate portion 5' is covered with a high permeability magnetic material thin film 3. Ferrite substrate portion 1' in which grooves 4, 4 forming track width Tω are formed
The end faces of the grooves 4 and 4 are butted and joined, resulting in a structure in which the grooves 4, 4 are filled with filling holes 9, 9. In this case, the width Tω of the tip of the narrow portion 1'a formed by the grooves 4, 4 of the ferrite substrate portion 1' becomes the track width.

Information is recorded and reproduced by the thin film portion 3' attached to this tip surface slidingly contacting the magnetic recording medium.

By the way, with the recent increase in recording density, this l
- Rack width dimensions are increasingly being set to a very narrow dimension of about 10 microns.

However, in the conventional structure and manufacturing method described above, since the grooves 4 are formed by mechanical processing directly on the thin film 3, mechanical force is applied directly to the thin film 3.
Particularly, the thin film portion 3' attached to the end face of the narrow portion 1a between the groove portions 4 is likely to be peeled off or deformed. Therefore, the distance between the grooves 4 that can be formed without causing peeling in the thin film portion 3', that is, the trunk width dimension, is several tens of microns.In other words, with the conventional structure and manufacturing method described above, the trunk width dimension that can be set is The limit was several tens of microliters.

As a solution to this problem, is it possible to process the l/rack part using a single method such as etching instead of using mechanical methods?These methods have the disadvantage of being costly. ,.

Purpose The present invention has been made in view of the above-mentioned drawbacks of the conventional art.The present invention has been made in view of the above-mentioned drawbacks of the conventional magnetic core. 1. It is an object of the present invention to provide a magnetic core having a structure in which the track width can be set very small without causing deformation or deformation, and a method for manufacturing the same.

EXAMPLES The present invention will be described in detail below based on examples shown in the drawings. In each figure, the same parts as in FIGS. 1 to 7 are denoted by the same reference numerals, and the explanation thereof will be omitted.

FIG. 8 to FIG. 14 each sequentially show the manufacturing process of the magnetic core according to the present invention.

The one shown in Figure 8 is the same ferrite substrate as the conventional one.
With Step 1, raise the flat side of the butting surface 2 as in the conventional method, and as shown in FIG.
Cover with

What is shown in FIG. 10 is a reinforcing thin plate 12 made of a non-magnetic phase that protects the thin film 3 of the ferrite substrate 1 from mechanical stress. The reinforcing thin plate has a predetermined uniform thickness, and the abutting surface 2 corresponds to the shape of the reinforcing thin plate. , In the present invention, this reinforcing thin plate 12 is replaced with the thin film 3 shown in FIG.
It is bonded to the abutting surface of the ferrite substrate 1 from above.

Thereafter, as shown in FIG. 11, the same grooves 4 as described above are mechanically applied a predetermined number of times 71' at intervals of a predetermined number factor '1'ω along the longitudinal side edge of the reinforcing thin plate 12.
- formed by

On the other hand, the one shown in FIG. 12 is a non-magnetic material substrate 5, which is the same as the conventional one, in which the winding grooves 7 are formed and the mating surfaces 6 are rounded. After that, butt the non-magnetic material substrate 5 against the noelite substrate 1 shown in FIG. Joined, 1st:3
The block 8' shown in the figure is 1u.

Next, in FIG. 13, there is a cut along the dotted line subtended by c-c' 2) - heat)', that is, passing through the center of the groove 4 and perpendicular to the longitudinal direction of the groove 8'. 17, fill the grooves 4, 4 on both sides with 4] 9 and 7, as shown in FIG.
A single magnetic core of 10t is obtained.

Thereafter, as shown in FIG. 14, the magnet wire 11 is wound around the noelite substrate portion 1' of the magnetic core unit 10 via the winding groove 7, thereby completing the magnetic core.

FIG. 15 is a partially enlarged view of the head surface of the completed magnetic core, which is the surface in sliding contact with the magnetic recording medium. 7 As shown in FIGS. 15 and 14, the structure of the completed magnetic core consists of a non-magnetic material substrate portion 5' having a winding groove 7 formed thereon, an end 1 of which is coated with a thin film 3; The reinforcing thin plate 12 is joined on top of the reinforcing thin plate 12, and the track width is ゛1゛ω from 142 of the reinforcing thin plate 12.
The end surfaces of the ferrite substrate portions 1' having the grooves 4, 4 formed therein are butted and joined, resulting in a structure in which the grooves 4, 4 are filled with fillers 9, 9.

According to this structure and the manufacturing method explained below, the groove portion 4,
4 is formed by machining from above the reinforcing thin plate 12 bonded to the thin film 3 formed on the butt 2 of the ferrite substrate 1, as shown in FIG. The thin film 3 is protected by a reinforcing thin plate 12 against mechanical stress that would cause it to peel off from the abutment 2 of the ferrite substrate 1 or stress that would cause it to deform.

Therefore, peeling and deformation of the thin film 3 including the thin film portion 3' forming the track that has arrived at the end face of the narrow portion l'a between the grooves 4 and 4 of the ferrite substrate portion 1' is prevented. 3. Therefore, the track width +1to+ can be set significantly narrower than in the above-mentioned conventional method without causing peeling or deformation of the thin film portion 3' forming the track of the completed magnetic core.

In fact, with the structure and manufacturing method according to the above-mentioned embodiments,
By using machining, we were able to set the track width to 10mm or 2mm without peeling or deforming the thin plate part 3'6.The effect is clear from the above explanation. In the present invention, in the above-mentioned divine magnetic core, a thin plate of non-magnetic material is bonded to the side 1f11 of the high permeability magnetic core coated with a thin film of high permeability magnetic material. , After this joining, the thin plate 1-
, grooves are formed at a predetermined pitch from 7 to obtain a rack width of 1. The thin plate surface on which the grooves are formed is butted against the side surface of the non-magnetic substrate on which the A wire groove is formed to obtain a block. To obtain a single magnetic core by cutting at the above-mentioned pitch, and to provide a magnetic core that can set the trunk width to a very small size using an inexpensive mechanical cutting machine without peeling or deforming the thin film part, and a method for manufacturing the same. can do.

[Brief explanation of the drawing]

Figures 1 to 6 explain the manufacturing process of a conventional magnetic core in order. Figure 1 is a perspective view of a noelite substrate, Figure 2 is a perspective view of a ferrite substrate coated with a thin film, and Figure 3 is a perspective view of a ferrite substrate coated with a thin film. Forms a groove./This is a perspective view of the light board, No. 4.
The figure is a perspective view of the non-magnetic material substrate, Figure 5 ID is a perspective view of the butted blocks, Figure 6 is a perspective view of the completed magnetic core, and Figure 7 is the head fan of the internal core in Figure 6. Partially enlarged view,
Figures 8 to 14 each explain the manufacturing process of an embodiment of the present invention in order. Figure 8 is a diagram of the remaining ferrite substrate, and Figure 9 is a perspective view of a ferrite substrate coated with a thin film. , Figure 10 is a perspective view of the reinforcing thin plate, Figure 11 is 'lIi
Fig. 12 is a perspective view of a non-magnetic material substrate, Fig. 13 is a perspective view of the butted blocks, and Fig. 14 is a perspective view of the completed magnetism 1a. ,
FIG. 15 is a partially enlarged view of the head surface of the magnetic core shown in FIG. 14. 1... Ferrite] Substrate 2, 6... Butting surface 3... High permeability magnetic material thin film 4... Groove portion 5... Non-magnetic material substrate 7... Winding groove 8'... ·block
9...Filler 10...Magnetic core alone 12...Reinforcement thin plate Figure 1 Figure m4

Claims (1)

[Claims] ■) An end face of a non-magnetic material substrate in which a winding groove is formed, and an end face of a high permeability material substrate coated with a high permeability magnetic material thin film and in which a groove portion forming a track width is formed. In a magnetic core consisting of a single magnetic core that is butted and joined, a thin plate of a non-magnetic material is joined to the end face of the substrate coated with the thin film, and the end faces of both substrates are bonded through the thin plate. A magnetic core characterized by butt torture. 2) a two-volt culm bonding a thin plate of non-magnetic material to the side surface of a high-permeability magnetic material substrate coated with a thin film of high-permeability magnetic material;
After the above bonding, a step of forming a plurality of grooves at a predetermined pitch from the thin & L to obtain a l rank width, and winding the thin plate with the grooves formed on the side surface of the non-magnetic substrate in which the wire grooves are formed. A method for manufacturing a magnetic core, comprising the step of cutting the blocks obtained by butting each other at the pitch to obtain a single magnetic core.