JPH01279404A - Manufacture of magnetic head core - Google Patents

Abstract

PURPOSE:To form a core with a gap for offering a color tone difference easily with a few processes by arranging a magnetic substance layer and brazing filler metal alternately, applying thermal pressing so as to form a block, cutting the block and bonding a front core and a back core. CONSTITUTION:A magnetic substance layer 11 such as a ferrite and a brazing filler metal layer 12 such as silver brazing filler metal are arranged alternately, subject to heating and pressing to form an incorporated block. Silver brazing filler metal, brass brazing filler metal or phosphorous copper brazing filler metal is used as the brazing filler metal and the heated temperature in case of employing silver brazing filler metal is 700-800 deg.C. After the block is cut off in a direction orthogonal to the arranging direction to be divided into lots of core blocks, a gap slot 13 is formed, each core block is cut off into a front core 14 and a back core 15, they are bonded to form a prescribed core. Thus, lots of head cores are easily formed with a few processes to improve the reliability and since mutual diffusion is not caused, a gap offering a color tone difference is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a method of manufacturing a magnetic head core suitable for application to v'rn, etc.

``Prior Art'' A structure as shown in FIG. 6 is known as a magnetic head applied to audio equipment and the like.

This is made of a magnetic material such as ferrite that is butted together with a non-magnetic material such as glass forming the gap 3! A bar core 5 made of a magnetic material is joined to a front core 4 composed of a pair of core blocks 1.2, and a coil 6 is wound around the back core 5.

To manufacture such a magnetic head, first the front core 4 is manufactured, and then the back core 5 is bonded thereto.

FIG. 7 shows a conventional method of manufacturing the front core 4, in which a magnetic material 4A that becomes the front core 4 is used, and the positions that will become the gaps 3 are machined to form grooves 3A and 3I3.
Next, a glass 7 as a non-magnetic material is brought into contact with these grooves 3A and 3B, and a gap 3 is formed by filling the grooves 3A with molten glass by heat treatment. In addition, since FIG. 8 shows another method, a pair of core blocks 1 and 2 and glass 7 are used, and after arranging these core blocks 1 and 2 and glass 7 in a predetermined relationship using a jig, heat treatment is performed. Integration is carried out by or by using an adhesive.

However, in all of these conventional methods, there is a problem in that the number of steps is increased. In addition, in the front sound method, when the glass is melted, bubbles may be present and remain as they are, and furthermore, the difference in hardness between the magnetic material and the glass tends to cause uneven wear in the gap, so reliability may be compromised. Low F. On the other hand, in the latter method, gap displacement and core displacement are likely to occur during the integration process, resulting in a decrease in the dimension M I5J:. Ultimately, either method has the problem of lack of reliability.

Therefore, the present applicant has developed a block in which magnetic layers and non-magnetic ceramic layers are integrated by alternately arranging magnetic layers and non-magnetic ceramic layers and firing and bonding them in a predetermined atmosphere. A process of cutting the block in a direction perpendicular to the arrangement direction and separating it into a large number of core pieces, and a process of cutting the block into a number of core pieces [1 piece], and a process of cutting the block in a direction perpendicular to the arrangement direction described above, and a process of cutting the block into a number of core pieces [1 piece] and forming a gap groove spanning the inner magnetic layer with a non-magnetic layer sandwiched between the core pieces. A method for manufacturing a magnetic head core is proposed, which comprises the following steps: forming a core block, cutting a core block in the arrangement direction to form individual front cores, and joining a back core to the front core. (Patent application Sho 6l-157527).

``Problems to be Solved by the Invention'' However, in the conventional technology as described above, ferrite is arranged alternately as a magnetic material and ceramic is used as a non-magnetic material, and a temperature of 1200°C to 1350°C is
They are integrated by firing at a temperature of °C, but in this process, the ceramic diffuses into the ferrite or into the ferrite, making the boundary between the two unclear, making it necessary to strictly control the gap dimensions. I can't. Therefore, the characteristics during recording or reproduction become insufficient. Further, since ordinary ceramics and ferrite, which is a magnetic material, have similar colors and, as mentioned above, diffuse into each other, the boundary between the two is visually unclear, and it is difficult to measure the dimensions of the gap.

The present invention has been made in response to the above problems, and therefore the manufacturing
It is an object of the present invention to provide a method for manufacturing a magnetic head core that is highly reliable and aesthetically pleasing while requiring less L.

In order to achieve the above object, the present invention provides magnetic material layers by alternately arranging magnetic layers and fflH layers made of non-magnetic metal and subjecting them to heat and pressure treatment in a predetermined atmosphere. A process of using a block with an integrated layer and a solder layer, a process of cutting the block in a direction perpendicular to the above arrangement direction to separate it into a large number of core blocks, and a process of sandwiching a solder layer between the core blocks. To provide a manufacturing method comprising the steps of forming a gap groove spanning an inner magnetic layer, cutting a core block in the arrangement direction to form individual front cores, and joining a back core to the front core. It is something.

The material of the solder material is a non-magnetic metal such as a silver layer, a brass layer, a phosphor layer, etc., and the predetermined atmosphere is a vacuum or N! A neutral atmosphere such as gas is preferable. The temperature of the heat and pressure treatment is preferably within a certain range below the melting point of the metal to be brazed, and in the case of a silver layer, it is 700-800°C.
It is ℃.

"Action J: By overlapping the magnetic layer and the solder layer made of non-magnetic metal in advance and subjecting them to heat and pressure treatment in an appropriate atmosphere and temperature, the magnetic layer and the solder layer are integrated. A block is formed. Since the front core can be manufactured by simply cutting this block, the number of manufacturing steps for the magnetic head can be reduced, and reliability can be improved accordingly. Comparing the melting point of the material and the melting point of the ferrite layer, the melting point of the ferrite layer is much higher, so if the heat and pressure treatment temperature is set within a certain range lower than the melting point of the solder material, the diffusion of the ferrite layer will be reduced. Of course, the diffusion of m-strokes is less likely to occur, so the dimensions of the gap layer formed by the solder material do not change5, and a magnetic head core with strict dimensional accuracy and good magnetic properties is manufactured.Furthermore, the ferrite layer The solder layer has a color of 1 or 5, and there is little diffusion on both sides, making it easy to identify the lumps, making it easy to measure dimensions, and of high aesthetic value.

Embodiment J FIGS. 1 to 5 are perspective views showing a method of manufacturing a magnetic head core according to an embodiment of the present invention. The steps will be explained below in order.

First, as shown in Fig. 1, ferrite II as a magnetic material and a silver layer 12 consisting of a thin plate of silver as a non-magnetic material are arranged alternately, set in a jig, and 0.5 to 3 kg/cIm''
In a pressurized state, firing treatment is performed at a temperature of 700° C. to 800° C. for 15 to 20 minutes in a vacuum or a neutral atmosphere such as N. Then, in this temperature range, the silver layer does not melt and is joined to the ferrite at the contact portion with the ferrite and becomes integrated, but the silver layer does not diffuse into the ferrite in a large amount. Thereafter, it is cut in the arrangement direction as shown by dotted lines to form a large number of blocks as shown in FIG.

Here, the width W of the silver layer thin plate 12 is selected to correspond to the gap size of the magnetic head. Next, as shown in FIG. 1, a gap groove 13 is formed in the block through the silver layer 12 so as to span both magnetic materials 11° 11, and then it is cut in the alignment direction as shown by the dotted line 7. . As a result, a large number of individual front cores 14 as shown in FIG. 4 are formed.

Next, as shown in FIG. 5, the back core 15 is joined to the front core 14 to obtain a magnetic head core 16.

According to such a manufacturing method, a block in which the ferrite 11 and the silver layer 12 are integrated is formed in advance, and the front core 14 can be formed by simply cutting the block three times, for example. Therefore, it is possible to reduce the number of manufacturing steps and reduce costs.

In addition, there is no need for the conventional process of welding glass, so no bubbles are generated.

Furthermore, since the block is cut, gap displacement and core displacement will not occur. Therefore, it is possible to provide a highly reliable magnetic head.

It should be noted that the magnetic material and non-magnetic metal solder material shown in the embodiments of the present text are merely examples, and any material may be selected depending on the purpose, use, etc.

``Effects of the Invention'' As described above, the manufacturing method of the present invention involves alternately arranging magnetic layers and solder layers made of non-magnetic metal and subjecting them to heat and pressure treatment in a predetermined atmosphere. A step of preparing a block integrated with a solder material layer, a step of cutting the block in a direction perpendicular to the above-mentioned arrangement direction to separate it into a large number of core blocks, and a step of sandwiching a solder material layer between the core blocks and forming an inner magnetic layer. a step of forming a gap groove spanning the body layers; a step of cutting the core block in the arrangement direction to form individual front cores;
Since it consists of a process of joining the back core to the front core, it is possible to manufacture a large number of magnetic head cores with a small number of man-hours, reduce the number of manufacturing steps, and at the same time improve reliability.

In addition, by setting the heat-pressing temperature below the melting point of the solder metal, mutual diffusion between the solder metal and the magnetic layer is prevented, forming a gear with high dimensional accuracy, and a magnetic head core with good magnetic properties. can be manufactured. Furthermore, since the gear is made of metal as opposed to a magnetic material such as ferrite, the difference in color tone of the ridges makes the gap part clear, and the dimensions of the gap part can be measured accurately.

[Brief explanation of the drawing]

1 to 5 are perspective views showing a method for manufacturing a magnetic head core according to an embodiment of the present invention, FIG. 6 is a perspective view for explaining the magnetic head core, and FIGS. 7 and 8 show a conventional example. FIG. 11... Ferrite layer (magnetic layer), 12...
- Brazing material layer (non-magnetic material layer), 1:3...Gap groove, 14...Front core, 15...Back core. Applicant Alps Electric Co., Ltd. Representative Kataoka Kataoka Figure 1 Figure 2

Claims (1)

[Claims] A block in which magnetic layers and solder layers made of non-magnetic metal are arranged alternately and heated and pressurized in a predetermined atmosphere so that the magnetic layers and solder layers are integrated is produced. a step of preparing the block; a step of cutting the block in a direction perpendicular to the arrangement direction to separate it into a large number of core blocks; and a step of forming a gap groove spanning both magnetic layers by sandwiching a solder material layer in the core block. A method for manufacturing a magnetic head core, comprising the steps of: cutting a core block in the array direction to form individual front cores; and joining a back core to the front core.