JP2973528B2 - Manufacturing method of magnetic head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a magnetic head used in a magnetic tape device used for writing and reading digital signals used in an input / output unit of a recording device such as an electronic computer.

[0002]

2. Description of the Related Art Conventionally, a magnetic head used for an input / output unit of a recording device such as an electronic computer includes a spacer block made of ceramics and a shield block made of ferrite over the entire width between a first magnetic head and a second magnetic head. As a result, the gap line of the first magnetic head and the gap line of the second magnetic head are kept parallel, and the assembly is performed while finely adjusting the distance between the gaps and the track shift.

Hereinafter, a general magnetic head will be described. FIG. 5 is an external perspective view showing a structure of a conventional multi-element magnetic head in an assembling completion step, and FIG. 6 is a sectional view taken along line XX 'of FIG.

7, 7 ', 8, 8', 9, 9 ', 10, 1
0 'is a core made of an oxide magnetic material such as ferrite, 7, 9 and 7', 9 'are light tracks, 8, 1
0 and 8 ', 10' are read tracks. Also, 2
6, 26 'and 27, 27' are shield blocks made of an oxide magnetic material such as ferrite for preventing external noise, 28 are spacer blocks made of an oxide non-magnetic material such as ceramic, Reference numeral 21 denotes an uneven wear preventing material made of an inorganic material such as glass for preventing uneven wear during running of the magnetic medium.

[0005] The assembly of the general magnetic head constructed as described above will be described. FIG. 7 is a three-dimensional perspective view showing a conventional magnetic head assembling process.

The first magnetic head 22 having a required gap width is formed by the cores 23 and 24, and the write tracks 7 and 9 are formed.
Then, a required shape having the lead tracks 8 and 10 is processed.

Next, the shield block 26 is formed on the first magnetic head 22, and the groove 31 of the shield block 26 is formed on the write tracks 7, 9 and the read tracks 8, 10.
Left and right average, and furthermore, an inorganic non-magnetic material such as glass 21 is placed on the shield block 26,
Bonding is performed by an electric furnace.

First magnetic head 2 with bonding
2 is processed so that the gap line A can be confirmed. Further, the side surface 25 of the first magnetic head 22 is processed so as to be perpendicular and parallel to the gap line A.

Next, the side surface 25 of the first magnetic head 22
The second magnetic head 22 ′ formed in the same manner as the first magnetic head 22 is attached to a jig with the side face 25 ′ facing the side face 25 ′.
And the distance between the gap line A 'of the second magnetic head 22' and the shield block 2 so that the distance L becomes a required dimension.
7 and 27 ′ and the side surfaces 30, 30 ′ of the spacer block 28 via an epoxy resin, and further, the tracks of the write tracks 7, 9 of the first magnetic head 22 which face each other. Width H and second magnetic head 2
The center deviation ₁ of the track width H1 of the 2 'read tracks 8' and 10 ', the gap line A of the first magnetic head 22, and the gap line A' of the second magnetic head 22 'are parallel. Then, adjustments were made while confirming dimensions and parallelism with a tool microscope or the like, fixed with a jig, and then placed in a drying oven to perform resin bonding.

[0010]

However, in the above-mentioned conventional structure, the gap line of the first magnetic head and the gap line of the second magnetic head to which the glass bonding has been performed are maintained in parallel at a predetermined distance while maintaining the gap distance. The method of adhering with the epoxy resin while interposing the shield block and the spacer block while adjusting the dimension of the track deviation of the read track of the second magnetic head facing the write track of the first magnetic head requires a considerably high level of technology. As a result, a track shift between the read track and the write track, a parallel gap between the gap line of the first magnetic head and the gap line of the second magnetic head, and the like may occur due to a change with time after the epoxy resin is cured or after the resin is cured. Easy and product yield was low.

[0011] Compared to glass and the like, the method of bonding with a resin is such that the hardness, dimensions and the like change with temperature and humidity, and the dimensional accuracy changes with the progress of polymerization of the resin upon reheating. It always involved problems in management and quality control.

In addition, since the distance from the gap line to the side surface of the bonded magnetic head and the dimensional accuracy, parallelism, squareness and thickness accuracy of each component such as the shield block and the spacer block are highly required, There were problems with man-hours, workability, etc.

[0013] Further, since it is necessary to adjust and fix with a jig, and to put the jig into a drying oven and to cure it, the work is complicated and requires many man-hours, and a large number of jigs is required. Etc. required a large investment.

[0014]

In order to achieve this object, a method of manufacturing a magnetic head according to the present invention has a structure in which a core, a shield block and a spacer block are collectively bonded by glass. I have.

[0015]

With this configuration, it is possible to simplify the working process, absolutely secure the dimensional accuracy, and greatly reduce the number of steps. That is, by performing collective bonding with glass or the like, which is an inorganic non-magnetic material, heat shrinkage, or dimensional change due to aging and reheating, and quality change due to temperature and humidity can be eliminated, and the magnetic head has a high quality. Quality is ensured.

[0016]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a magnetic head embodying the present invention, FIG. 2 is an external perspective view of a completed assembly process embodying the present invention, and FIG. FIG. 3B is a cross-sectional view, and FIG. 3B is an enlarged view showing a track shift.

In FIG. 1, FIG. 2, and FIG.
Are the first and second magnetic heads, 3, 4, 5, and 6 are cores,
9 is a write track, 8 and 10 are read tracks, 1
1, 11 ', 14, and 14' are shield blocks, 16 is a spacer block, and 21 is an uneven wear preventing material. These are the same as those in the conventional example.

Reference numeral 13 denotes a glass filling groove provided in the shield block 11, and reference numeral 15 denotes a shield block 14.
Is a groove for filling the glass provided in. This is for improving the adhesive strength. Therefore, when glass having strong adhesive strength is used, it is not necessary to provide the glass. The grooves 15 may be provided on both side surfaces 20 of the spacer block 16.

The assembling of the magnetic head configured as described above will be described below.

FIG. 4 is a three-dimensional perspective view showing a magnetic head assembling process according to an embodiment of the present invention. Cores 3, 4 and 5,
6, the first magnetic head 1 having the required gap width and the second
The magnetic head 2 is prepared and processed into a required shape having write tracks 7 and 9 and read tracks 8 and 10. Next, the core 4 of the first magnetic head 1 and the core 5 of the second magnetic head 2 are attached to a temporary bonding jig so as to be joined on the back surface. However, the length of the cores of the cores 4 and 5 is の of the required dimensional distance L between the gap line A of the first magnetic head 1 and the gap line A ′ of the second magnetic head 2, and When the side surface 4 'of the core 4 of the magnetic head 1 and the side surface 5' of the core 5 of the second magnetic head 2 are joined, the gap line A of the first magnetic head 1 and the gap line A 'of the second magnetic head 2 It is machined to the dimensions and precision to obtain parallelism.

Next, as shown in FIG.
The track width H of the light tracks 7, 9 of the magnetic head 1;
Tracks of read tracks 8 and 10 of second magnetic head 2
Width H ₁Of the center of the track width of l is l = 0 ± 0.00
Adjust the thickness to 6mm and use an adhesive to make the first magnetic
Back surface 4 'of core 4 of head 1 and core of second magnetic head 2
The back surface 5 'of 5 is temporarily bonded.

After the temporary bonding, the first magnetic head 1 and the second magnetic head 2 are removed from the temporary bonding jig, and the shield block 1
1, 11 'side 17 and shield blocks 14, 14'
Side 18 of shield block and side 1 of shield block 14, 14 '
9 and the spacer block 16 are inserted and arranged so that both side surfaces 20 face each other. At that time, the shield blocks 11, 1
The 1 'groove 12 is such that the write tracks 7, 9 and the read tracks 8, 10 of the first and second magnetic heads are located at the center with respect to the groove 12.

Next, the glass 21 is placed on these,
Attached to a glass mold jig and welded simultaneously by an electric furnace. At this time, the difference between the working temperature of the inorganic non-magnetic material for the gap line and the working temperature of the inorganic non-magnetic material for the bonding is 50 ° C. or more.
In addition, it is preferable that 6 to 10 glass mold jigs can be simultaneously attached by one jig so as to improve workability.

After welding, a finishing process is performed to obtain a shape as shown in FIG. In the magnetic head configured as described above, the dimensional accuracy after welding is smaller than that of a magnetic head bonded with resin, due to thermal shrinkage, dimensional change due to aging, and dimensional change due to polymerization during reheating. No, high quality is ensured. Furthermore, the parallelism and the distance of the gap lines A and A 'are ensured when the core is formed, as compared with the method of adjusting the parallelism and the distance of the gap lines with the shield block and the spacer block. Therefore, the required dimensions and accuracy are maintained only by securely attaching to the jig, and the shield block and spacer block by the jig do not need to be held by the jig, but are simply placed on the core, so workability is remarkable. improves.

[0026]

As described above, according to the present invention, since all materials constituting the magnetic head are welded and integrated by glass, they are not affected by temperature, humidity, etc., and have a semi-permanent size and accuracy. Is secured. Further, since partial dimensions and accuracy are ensured in the work process, workability is improved, and a magnetic head with stable quality can be provided with high yield.

[Brief description of the drawings]

FIG. 1 is a perspective view of a completed multi-element magnetic head for a magnetic tape device according to an embodiment of the present invention.

FIG. 2 is an external perspective view of an assembly completion process in which the present invention is implemented.

3A is a cross-sectional view taken along the line YY 'of FIG. 2; FIG. 3B is an enlarged view showing a center deviation of a track;

FIG. 4 is a perspective view of a three-dimensional assembly process leading to FIG. 2;

FIG. 5 is an external perspective view showing a structure of a conventional magnetic head in an assembly completion process.

FIG. 6 is a sectional view taken along line XX ′ of FIG. 5;

FIG. 7 is a three-dimensional perspective view of an assembling process of the conventional magnetic head up to FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st magnetic head 2 2nd magnetic head 3,4,5,6 Core 7,9,7 ', 9' Write track 8,10,8 ', 10' Read track 11,11 ', 14,14' Shield Block 16 Spacer block 21 Glass

Claims (1)

(57) [Claims] 1. A step of joining first and second magnetic heads, each having a read track and a write track disposed on the same surface, to each other, and providing a spacer block on a surface of the joined body where the read tracks and the write tracks are disposed. Symmetrically arranging the shield block and the shield block in which the insertion groove part for arranging the read track / write track in the center part, and placing an inorganic non-magnetic material such as glass on the arrangement surface And a step of melting an inorganic non-magnetic material such as glass and fixing and integrating each component.