JPS59121614A - Composite magnetic head and its production - Google Patents

Abstract

PURPOSE:To improve the positional accuracy between magnetic head cores and to enable easy production by adhering the respective joint surfaces of a main spacer, magnetic head core and partial spacers via adhesive agents to each other. CONSTITUTION:Partial spacers 15a, 15b consisting of a material (Al2O3, SiO2, etc.) having heat resistance and good affinity to an adhesive agent are attached on the end parts of both side faces of a main spacer 13 consisting of a nonmagnetic material such as ceramics, glass or the like and low-melting glass 14 as an adhesive agent is coated in the remaining part except the parts attached with the partial spacers on both side faces of the spacer 13. The spacers 15a, 15b are formed to have the length L roughly the same as the length of the spacer 13, the width W narrower than the width of the spacer 13 and the thinnest possible thickness t. The glass 14 is stuck on both side faces of the spacer 13 by means such as vapor deposition, sputtering, etc. The assembly is finally cut to each one piece of the composite head, and coil winding grooves 20, 21 are formed on the outside lateral faces of the respective magnetic head cores 16, 17 and further a surface 22 for sliding contact with a magnetic medium, etc. are formed.

Description

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

[Technical background of the invention]

Recently, so-called composite magnetic heads have been developed, in which a pair of magnetic head cores with different functions, such as a recording/reproducing core and an erasing core, are joined together via a non-magnetic substrate and then bonded together with an adhesive. It is widely used.

FIG. 1 is a perspective view showing the main parts of the composite magnetic head, and FIG. 2 is a view of the hood shown in FIG. 1 viewed from above.

As shown in these figures, a pair of magnetic helad cores having different functions, such as a recording/reproducing core 1 and an erasing core 2, are joined via a spacer 3 made of a non-magnetic material. On the other hand, the magnetic herad core 1 has a track width of Tw, a gear, and a g of
To the other magnetic field, the core 2 has a track width TEL, ]! 12% gap 752g2
is formed. Each of the magnetic head cores 1, 2 and the hardener 3 are integrated by bonding their joint surfaces together using lath welding or an adhesive such as organic adhesive.

By the way, manufacturing of this type of composite magnetic head has conventionally been carried out as follows.

First method: As shown in Fig. 3, a low melting point lath 4 as an adhesive is applied to both sides of the spacer 30 in advance, and this is applied between a pair of magnetic rods 1 and 2. While sandwiching and aligning the rad cores 1 and 2 to both magnetic fields, pressure is applied to the outer surfaces of the rad cores 1 and 2 by a force P to both the magnetic fields.

Then, while maintaining this state, the low melting point glass 4 is heated in an inert gas atmosphere to a temperature below the melting point of the glass 4, and the low melting point glass 4 is melted to form one glass 3 in each magnetic held core 1.2 and glass 4. Glue.

Second method: As shown in Fig. 4, a plate-shaped body 7 with spacers 5@, 5b made of non-magnetic material at both ends and a lath 6 with a low melting point at the center is prepared in advance, and this plate The shaped body 7 is sandwiched between magnetic rods 1 and 2 as shown in FIG. Thereafter, in the same way as in the first method, the low melting point glass 6 is melted by heating in an inert gas atmosphere, and the magnetic heads 1, 2 and the bather 4-5a are heated.
, 5b.

Incidentally, in such a composite magnetic head, as the recording density increases, emphasis is placed on the mutual positional accuracy of the magnetic cores.

[Problems with background technology]

Conventional integrated magnetic heads and methods of manufacturing the same have the following problems.

In the first method, when the low melting point coated on both sides of the spacer 3 reduces the thickness of the lath 4, the low melting point is applied to the entire bonding interface between the spacer 3 and the magnetic heads 1 and 2. glass 4
is not sufficiently spread, leading to a decrease in adhesive strength, and in areas where the low melting point lath 4 does not spread, pitching 8 as shown in Figure 2 occurs on the contact surface with the recording medium, damaging the magnetic recording medium. There is a risk of causing And vice versa,
The occurrence of chipping 8 as shown in FIG. 2 can be prevented by increasing the thickness of the glass 4 having a low melting point and pushing out excess low melting point glass from the bonding interface by applying strong pressure. However, the final thickness of the low melting point lath 4 is extremely thin, on the order of a few μm, so if the coating is too thick, the low melting point lath 4 may be thinned during heating. The mutual positions of the magnetic helical cores 1 and 2 on both sides change, making it difficult to maintain a high degree of positional accuracy and reducing the yield of products.

In addition, in the second method, since both the inner surfaces of the magnetic heald cores 12 are in contact with the spacers 5a and 5b, it is difficult to maintain a high degree of positional accuracy between the magnetic heald cores 1 and 2. It is easy to understand. However, due to heating, there is a problem that the lath 6 has a low melting point and is difficult to penetrate into the bonding interface between the core 1.2 and the spacers 5m and 5b. Must be heat treated at high temperatures. However, if the temperature is lowered, the gap gl+g between cores 1 and 2 for each magnetic field! and embedded adhesive glass regulating the track width Tw t TEL + TE2 (shown as 9 and 10 in Figures 1 and 2).
There is a problem that the gap and track width change due to softening of the track width. For this reason, when using the second method, special constraints arise, such as having to select a glass material with a high softening point for the embedding laths 9 and 10. Moreover, even after adhesion, the magnetic helad 3 f1,
Between 2 and 2, there is a layer 6 with a low melting point corresponding to the thickness of 5h and 5b.
This is because the strength of the ceramic material that is generally used as the material for the spacers 5a and 5b is weaker, so that during the subsequent grinding process, the low melting point lath 6 will have a groove 11 as shown in FIG. There is a possibility that this may occur.

[Purpose of the invention]

The present invention was made based on these circumstances, and
A first object of the present invention is to provide a composite magnetic head that improves the positional accuracy of magnetic rad cores with respect to each other and has sufficient adhesive strength.

A second invention is to provide a manufacturing method that allows easy manufacturing of the above composite magnetic head. [Summary of the Invention] The composite magnetic head according to the first invention is characterized in that A main spacer made of a non-magnetic material inserted between the two magnetic head cores, and a material having heat resistance and affinity with adhesives. a pair of partial spacers inserted between the end opposite to the recording medium contacting surface and both side ends of the main spacer; and a pair of partial spacers inserted between the main spacer and each magnetic head core; The present invention is characterized in that adhesives are used to bond between the rad core and each of the partial spacers and between each of the partial wavers and the main 6 spacers.

Further, the method for manufacturing a composite magnetic head according to the second invention includes manufacturing a composite magnetic head in which a pair of magnetic heads with different functions are integrated via a main spacer whose bore is made of a non-magnetic material. In order to do this, the end of the inner surface of each magnetic disk core opposite to the surface in sliding contact with the recording medium or the ends of both side surfaces of the main spacer are made of a material that is heat resistant and compatible with adhesives. Attach a partial spacer, and apply adhesive to the area of the surface to which the partial spacer is attached, excluding the area where the partial spacer is attached, and insert the main spacer between the magnetic cores and the adhesive. By melting the adhesive while applying pressure to the outer surfaces of both magnetic head cores in an atmosphere at a temperature higher than the melting point of the adhesive, the main groover/magnetic held core, magnetic held core/partial spacer, and partial spacer are formed. The main spacer is characterized in that the bonding surfaces of the main spacers are bonded to each other via the adhesive.

〔Effect of the invention〕

According to the first invention, since the partial spacer is inserted between the magnetic core and the main spacer, the magnetic head cores and the main spacer are unlikely to be misaligned with each other even by heat treatment. Therefore, the mutual positional accuracy of both magnetic rad cores is improved. Furthermore, since it is easy to apply a thin layer of adhesive at the bonding interface and a small amount of material with low strength can be used, wear resistance can be improved. In addition, the occurrence of chipping as shown in FIG. 2 on the surface in sliding contact with the recording medium can be prevented, and there is no risk of damaging the recording medium.

Furthermore, there is no problem even if the adhesive does not penetrate sufficiently between each magnetic rad core and the partial spacer.
Heat treatment can be performed at relatively low temperatures.

Further, according to the second invention, since the positioning of both magnetic disk cores is facilitated, a composite magnetic head with excellent characteristics can be easily manufactured.

[Embodiments of the invention]

Figures 6 to 8 show an example of misexplosion,
The manufacturing process of the composite magnetic head will be explained step by step with reference to these figures.

First, as shown in Fig. 6, the main spacer 13, which is made of a non-magnetic material such as ceramic or glass, is coated with a material having good heat resistance and compatibility with the adhesive (in this case, the glass 14 has a low melting point). Partial spacers 15m and 15b made of adhesive material (for example, alumina Al2O3, silica 5IO2, etc.) are attached, and a lath 14 with a low melting point as an adhesive is attached to the remaining parts of both sides of the spacer 13, excluding the part where the partial spacers are attached. Apply. The main surface 4-13 is machined by cutting, grinding, lapping, or the like. In addition, partial suspension 15m, 15b
The length L is approximately the same as that of the main spacer 13, the width W is narrower than that of the main spacer 13, and the thickness t is made as thin as possible. Furthermore, the lath 14 having a low melting point is attached to both sides of the main surface 4-13 by means of vapor deposition, sputtering, or the like.

Next, the one prepared as shown in Fig. 6 is sandwiched between a pair of magnetic head cores (for example, for recording/reproducing, erasing, etc.) 16, 17, and while aligning both magnetic head cores 16917 with each other, Apply pressure to the outer surface of Radcore 16 and 17 with the required force. Then, while maintaining this state, heat in an inert gas atmosphere to a temperature higher than the melting point of the lath 14, which has a low melting point, to melt it and adhere the rad cores 15m and 15b to each magnetic layer and the main lath 13. .

In the figure, reference numerals 18 and 19 denote embedded adhesive glasses for regulating the gap and track width of each magnetic rad core 16° and 17. In this step, the lath 14 with a low melting point is pressurized, and the partial spacers 15a and 15b are made of a material with a low melting point that has affinity with the lath 4. Partial slider 15a.

15b, and between the main slider 13 and each partial slider 15h, 15b, a low melting point plus 14 is applied.
is sufficiently distributed. And by applying pressure, the melting point is lower than 14.
Since the thickness is formed to be sufficiently thin, occurrence of lapping as shown in FIG. 2 can be prevented. Moreover, the partial nepacers 15a t 15 b interposed between each magnetic helical radial core 16.17 and the main spacer 13 can prevent the positional shift between the magnetic radial core 16.17 and the main spacer 13 during pressurization. It is possible to improve the mutual positional accuracy of the cores 16 and 17 for both magnetic fields.

Next, the thus-prepared product is cut into composite parts, each having a radius of 1.6 mm, and each magnetic core has a radius of 1.6 mm as shown in Figure 8.
．． Coil winding grooves 20 and 21 are formed on the outer surface of 17,
Furthermore, a recording medium sliding contact surface 22 and the like are formed.

9 and 10 show other embodiments of the present invention. In this embodiment, first, the partial surface area is 15m, 15m
b and low melting point lath 14 to each magnetic core 16.1
After inspecting the inner side of 7, it is manufactured by the same hand + 1 as described above.

In this case, the partial 4-sa l 5 a t' l 5 b
The attachment position is at the end of the inner surface of each magnetic disk core 16.1 on the side opposite to the recording medium sliding contact surface 22.

Further, in this embodiment, as shown in FIG. 10, a pair of magnetic head cores 16 and 17 which are joined to each other are sandwiched between reinforcing non-magnetic plates 23 and 24. In this case, the magnetic head cores 16, 17 and the non-magnetic plates 23, 24 are bonded together in the same manner as when both the magnetic head cores 16, 17 are bonded via the main screws 13. That is, 25 & in the figure.

25b, both magnetic held cores 16.17 and non-magnetic plate 23.
24 is a partial spacer υ, and 26 is also a low melting point glass as an adhesive.

[Brief explanation of the drawing]

Figures 1 to 4 show a conventional example. Figure 1 is an external perspective view of a composite magnetic head, Figure 2 is a front view of the same magnetic head, and Figure 3 is a perspective view for explaining the manufacturing process. Figure, 4th
Figure and #! 5 is a perspective view and a vertical cross-sectional view for explaining another manufacturing process, FIGS. 6 to 8 show an embodiment of the present invention, and FIGS. 6 and 7 illustrate the manufacturing process. 8 is a perspective view of the external appearance of a completed composite magnetic head, Figures 9 and 10 show other embodiments, and Figure 9 is a perspective view for explaining the manufacturing process. , FIG. 10 is an external perspective view showing the completed composite magnetic head. No. 3 Main hardener, 14 Low melting point glass (adhesive), 15 a, 15 b-=Partial hardener, 16
゜17...Magnetic Heradcore Applicant Representative Patent Attorney Takehiko Suzue 1 Figure 3 IP 2 Figure 1 9 3 2 Figure 3 Crow / Figure 7 Figure 8 Figure 2

Claims (6)

[Claims] (1) A pair of magnetic cores with different functions, a main spacer made of a non-magnetic material inserted between the magnetic cores, and a material that is heat resistant and compatible with adhesives. a pair of partial spacers inserted between an end of the inner surface of each of the magnetic disk cores on the side opposite to the recording medium sliding contact surface and end portions of both side surfaces of the main space; A composite magnetic head characterized in that δ is provided with an adhesive between each magnetic core and each magnetic core. (2) The composite magnetic head according to claim (1), wherein the material of the partial spacer is alumina or silica. (3) A composite magnetic head according to claim 0, wherein the adhesive is a low-melting glass. (4) When manufacturing a composite magnetic head in which a pair of magnetic helad cores with different functions are integrated via a main spacer made of non-magnetic material, what is the recording medium sliding contact surface on the inner surface of each magnetic head core? A partial spacer made of a material having heat resistance and affinity with adhesives is attached to the opposite end or both side edges of the main spacer, and one spacer is attached to the partial spacer. Adhesive is applied to the remaining part of the surface except for the part where the partial spacer is attached, and the main spacer is inserted between the magnetic head cores and the outer surface of both magnetic head cores in an atmosphere having a temperature higher than the melting point of the adhesive. By melting the adhesive while applying pressure, the bonding surfaces of the main spacer/magnetic core, magnetic core/partial spacer, and partial spacer/main spacer are bonded together. 1. A method for producing a composite magnetic layer, characterized in that it is bonded via an agent. (5) The method for manufacturing a composite magnetic field according to claim (4), wherein the material of the partial spacer is alumina or silica. (6) A method for manufacturing a composite magnetic head according to claim (4), wherein the adhesive is a low-melting glass.