JPS62119711A - Magnetic head and its production - Google Patents

Abstract

PURPOSE:To improve magnetical characteristics by joining a nonmagnetic substrate and magnetic core by using a silver brazing filler metal so that a heat treatment for relieving work strain is made possible. CONSTITUTION:The silver brazing filler metal is melted onto the nonmagnetic substrate 8' constituted by forming a metallized layer 21 by an Mo-Mn method on a ceramic material 20 to form a silver solder layer 22. The nonmagnetic substrate 8' provided with the silver solder layer 22 is put onto a cutting table 16 in which the cut magnetic core material is housed in such a manner that the silver solder layer 22 contacts the same. The silver solder layer 22 is heated to melt the silver solder layer by which the nonmagnetic substrate 8' and the magnetic core material 1' are joined. The nonmagnetic substrate 8' is classified to the alumina ceramic material, forsterite ceramic material, or zirconia ceramic material according to the kind of the metallized layer 21 to be formed on the ceramic material 20.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a magnetic head, and more particularly to a two-channel in-line magnetic head and its magnetic head for use in a Vi electronic still camera device. This relates to a manufacturing method.

(b) Prior Art The present applicant previously proposed such a magnetic head and its manufacturing method in Japanese Patent Application No. 59-229807. The magnetic head consists of each head chip (H
A pair of magnetic cores (1) (2) constituting +) (H2) are superimposed and fixed on each other in a plane substantially parallel to a plane (S) including both gaps CG1)C02), and Sex core ill (210 heads (4) # according to track width
1 width and the end of the magnetic core on the opposite side from the head (
5) is formed to have a wide width, and a shaft portion (6) is formed on at least one of the pair of magnetic cores filt2) to protrude toward the other magnetic core, and a coil (7) is formed on the shaft portion (6).
It has a structure in which a non-contact substrate (9) is provided on a pair of helad chips on both sides of a plane including the gap (G+) (G2) and parallel to the plane. There is. And that! ! ! As shown in Figure 4, (-)
The comb-shaped magnetic core material uf 1 is coated with an organic adhesive on a non-magnetic substrate (8) such as ceramic. 14. Join as shown in Figure 14(b). Then, a groove ul is made parallel to the front surface (S) to form a shaft portion (6) on which a coil (7) can be wound. After winding the coil (7) as shown in FIG. 4(C), the magnetic core (21) is bonded to another non-magnetic substrate (9) as shown in FIG. 4(d).Continued Then, a notch 1 and a notch U for inserting the shield material are immediately provided on the front side as shown in Fig. 4(d). A single piece T- is formed.A shielding material (2) is inserted or filled in the cut @, but it may also be a slicing curve into a single head chip.

e-C While the invention is trying to solve the problem, however,
In the above prior art, the organic handling agent used to join the magnetic plate and the magnetic core did not have sufficient bonding strength, deteriorated in high humidity conditions 2, and underwent heat treatment (600°C to 70°C) to remove processing distortion.
IJ of the head such as not being able to perform [0℃]! This was an obstacle to fabrication and recording/reproduction efficiency. If a high melting point metal thread bonding material is used instead of the organic bonding agent, the magnetic core material (sendust material) (11) and the non-magnetic substrate (alumina moon 81) are combined as shown in Figure 5. The thermal expansion coefficient of the former is 15
0X107℃, the latter one is 70×10-7/℃, and the difference between them is 80X10'/℃, which is a large difference, so when the temperature increases, it bends as shown in the diagram, and when it returns to normal temperature, A crack u9 occurs as shown in FIG.

The present invention solves the above problems.

In the present invention, an alumina thread ceramic material, a forsterite thread ceramic material, or a zirconia thread ceramic material is used as the non-magnetic substrate, and the non-magnetic substrate and the magnetic core are bonded with silver solder. The magnetic head has a structure in which the magnetic head is joined with a material. Silver brazing material melts at about 800°C.

Also, part 5! In the method, a magnetic core material made of sendust material formed into a comb tooth shape is inserted into a storage groove of a canding table, and the magnetic core material is cut so that there are two comb teeth each, while a non-magnetic substrate is inserted. A silver solder layer is applied on top, and the nonmagnetic substrate with this silver solder layer is placed on the cut magnetic core material stored in the storage groove.
This method includes a method in which they are brought into contact with each other via a silver solder Ii1 and are combined by heating and melting the solder solder layer.

(e) Function The non-magnetic substrate and the magnetic core material made of sendust material are firmly bonded by silver solder. In the manufacturing process, inconveniences caused by the thermal expansion coefficients of the non-magnetic substrate and the magnetic core material can be significantly alleviated by cutting the magnetic core material into head chip units and joining them together, which prevents cracks from occurring. do not have.

(f) Example In the present invention, a magnetic core material made of sendust material formed into a comb-like shape as shown in FIG. Rub.

Next, this magnetic core material (11) is fitted into the storage groove Uη of the cutting table (161) as shown in FIG. 1(b). The cutting table (161 is made of, for example, a carbon plate.
The magnetic core material (161
Cut along the dotted line ul. Note that before cutting, a groove opening in a direction parallel to the front surface as shown in FIG. 2 is formed. The groove 1G may be formed already in the shape shown in FIG.

On the other hand, as shown in Fig. 1 (C), MO-M is placed on the ceramic material ■.
A silver solder material is melted on a non-magnetic substrate (81) on which a metallized layer (1) is formed by the n-method to form a silver solder layer.

Next, as shown in FIG. 1(d), the non-magnetic substrate (8) on which the silver solder layer has been thrown is placed on the cutting table UE containing the cut magnetic core material.
The silver solder layer @ is combined so that they are in contact with each other, and the silver solder layer (
The silver solder layer is melted by the m heat of step 2) to form a non-magnetic substrate (8).
1 and the magnetic core material (11). In the above, the non-magnetic substrate (8) is made of alumina ceramic material, depending on the type of metallized layer (2) to be formed on the ceramic material
Although it is classified as a forsterite thread ceramic material or a zirconia ceramic material, any of them may be conveniently used in the present invention. After joining as shown in FIG. 1(d), the first joined block taken out from the cutting table (end) is shown in FIG. 2. A coil (7) is wound around the shaft portion (6) in FIG. 2 as shown in FIG. 4(C).

After that, as shown in FIGS. 4(d) and (e) of the conventional example, another second bonding block (to) (this second bonding block also cuts the magnetic core material, and the non-magnetic substrate The first and second bonding blocks are then bonded to each other by a glass bonding method or an organic bonding method. (c) A narrow head (4) having a gap is formed in front of the magnetic head, and a two-channel in-line magnetic head having a shape similar to that shown in FIG. 6 is obtained by cutting 9J per head chip.

(G) Effects of the Invention According to the present invention, since the non-magnetic substrate and the magnetic core are bonded using silver brazing material, a strong bond can be realized, reliability is improved as above, and processing distortion can be eliminated. Since the heat treatment is 9 tons, the magnetic properties are also the same as above. In addition, during the manufacturing process, cracks due to the thermal expansion relationship between the non-magnetic substrate and the magnetic core material do not occur at high temperatures that are too high for silver brazing material, resulting in better yields. There is an effect.

[Brief explanation of drawings]

1 and 2 are diagrams showing a method of manufacturing a magnetic head according to the present invention, and FIG. 6 is an external perspective view of the magnetic head to which the present invention is applied. FIG. 4 is a diagram showing a conventional manufacturing method, and FIGS. 5 and 6 are explanatory diagrams of the conventional example. (11 (21... magnetic core, (4)... head, 16
1...Shaft part, (81tsi L91...I magnetic substrate, ue...Cutting table, (17)...Storage groove, uto...Comb tooth, @...Silver solder layer, (Ha) )...1st
Joint block, bit...second joint flock, -...combined object, ()11) (H2)...head chip, (G+
J (G2)...Gap.

Claims (2)

[Claims] (1) A pair of magnetic cores that make up each head chip are stacked and fixed on top of each other in a plane that is approximately parallel to the plane that includes both gaps, and the head of each magnetic core has a narrow width that corresponds to the track width. At the same time, the end of the magnetic core opposite to the head is formed wide, and in the wide part, at least one of the pair of magnetic cores has a shaft part protruding toward the other magnetic core. In a two-channel in-line type head in which a coil is wound and non-magnetic substrates are respectively provided on a pair of head chips on both sides of a plane including a gap portion and parallel to the plane, alumina is used as the non-magnetic substrate. A magnetic head characterized in that the magnetic core is made of sendust material, and the non-magnetic substrate and the magnetic core are bonded to each other with a silver brazing material. (2) A magnetic core material made of sendust material formed into a comb tooth shape is inserted into the storage groove of the cutting table, and the comb teeth are 2
a step of cutting the magnetic core material so that the magnetic core material is divided into two pieces, a step of applying a silver solder layer to the non-magnetic substrate, and a step of storing the cut magnetic core material in the non-magnetic substrate provided with the silver solder layer. a step of joining the non-magnetic substrate and the magnetic core material by heating the silver solder layer so that they are in contact with each other on a cutting table; and a first bonding step taken out from the cutting table. A step of winding a coil around a shaft portion formed by the comb teeth formed at the rear end of the magnetic core of the block, and a step of winding a second bonded block consisting of another non-magnetic substrate and a magnetic core made of sendust material. a step of joining the first joining block and the magnetic cores so that they are in contact with each other, a step of forming a narrow head having a gap in front of the combined body of the first and second joining blocks, and the non-magnetic substrate 1. A method for manufacturing a magnetic head, comprising the step of cutting the magnetic head into head chips.