JPH029011A - Manufacture of thin film combination head - Google Patents

Abstract

PURPOSE:To eliminate a spacing loss, and also, to constitute the title head so that its head characteristic is almost the same as that of a thin film magnetic head of a recording use or reproducing use simple substance by forming a recording use head and a reproducing use head in one body, and thereafter, executing again a tape polishing process for the tape sliding surface. CONSTITUTION:A recording use head block 4a and a reproducing use head block 4b which have finished grinding and polishing processes for the tape sliding surface 5 are formed in one body by sticking each back face of substrates 1 so that the respective tape sliding surfaces 5 are arranged horizontally. Thereafter, it is cut along a two-point chain line A2 and separated into a pair of thin film magnetic head elements 2 for recording use and reproducing use. This separated thin film combination head chip 6 is inserted into a head holder 7, fixed by an adhesive resin, and thereafter, tape polishing working is performed to the tape sliding surface again by using a wrapping tape 9. In such a way, a thin film combination head 8 having a head characteristic being not inferior to a thin film magnetic head of a simple substance can be obtained.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention provides S-D AT [5tationary
head dig-ital audio tape
The present invention relates to a method of manufacturing a thin film combination head in which a recording and reproducing magnetic head is integrated, which is used in a magnetic recording device for a computer, etc.

[Conventional technology]

In order to perform high-density magnetic recording at high speed in magnetic recording devices such as 5-DATs and computers, multi-channel magnetic heads with narrow gap widths are required. It is extremely difficult to manufacture the core of such a magnetic head by machining due to limitations in mechanical precision.

Therefore, recently, narrow gap widths are formed with high precision,
Thin-film magnetic heads, which can be easily multi-channeled, have come into practical use.

Furthermore, in fixed head type PCM tape recorders, for example, in order to accurately determine the relative positions of the recording and reproducing magnetic heads, a thin film combination head is used that integrates the recording and reproducing magnetic heads. ing.

A conventional manufacturing method of this thin film combination head will be explained based on FIG.

First, as shown in FIG. 2(a), a large number of thin film magnetic head elements 12 are formed on the surface of a substrate 11 using thin film technology. Next, this is indicated by the two-dot chain line B in the figure.

Cut along...

Then, as shown in FIG. 2(b), a protective plate 13 is adhered to the surface of each cut substrate 11 on which the thin film magnetic head element 12 is formed, thereby forming a head block 14. This head block 14 is further finished by grinding the tape sliding surface 15 to a predetermined curvature, and then by tape polishing.

This head block 14 is formed by the above steps into a recording head block 14a and a reproduction head block 1, respectively.
4b is formed. Then, as shown in FIG. 2(C), the recording head block 14a and the reproducing head block 14b are attached to the back surfaces of the substrates 11, 11 so that the tape sliding surfaces 15, 15 are aligned side by side. and become one. Therefore, the relative positions of the recording head and the reproducing head are accurately determined by this process. When this integration by pasting is completed, it is then cut along the two-dot chain line B2 . . . shown in the figure.

As shown in FIG. 2(d), the thin film combination RAD chip 16 separated into individual parts is attached to the head holder 17 with only the tape sliding surfaces 15, 15 protruding.
Insert into. Then, by pouring resin into the gap between the head holders 17 and adhesively fixing them, the thin film combination head 18 is completed.

[Problem to be solved by the invention]

However, the conventional thin film combination head 18 manufactured in this manner has a problem in that its characteristics as a magnetic head are often inferior to those of a single thin film magnetic head for recording or reproduction.

The cause of the deterioration of head characteristics in the thin film combination head 18 will be explained based on FIG. 3.

In the case of a single thin-film magnetic head 21 for reproduction, FIG.
), while reproducing the magnetic tape T that has been correctly recorded in advance, move the arrows A and A to obtain the maximum output.
Adjust the position in directions B, C and D. In the case of a single recording thin film magnetic head 22, as shown in FIG. 3(b), the position of the reproducing thin film magnetic head 21 is first adjusted in advance by the above method. Then, a recording thin film magnetic head 2
While reproducing the magnetic tape T recorded in step 2 with this reproducing thin film magnetic head 21, the position of the recording thin film magnetic head 22 is adjusted according to arrows A and B so that the output of the reproducing thin film magnetic head 21 is maximized. , C and D directions.

Therefore, by individually adjusting the positions of the single thin film magnetic head 21 for reproduction and the thin film magnetic head 22 for recording, spacing loss with respect to the magnetic tape T can be eliminated for each.

However, in the case of the thin film combination head 18,
Since the relative positions of the recording head 18a and the reproducing head 18b are fixed, the optimal position of the reproducing head 18b and the recording head 1 in the directions of arrows A, B, C, and D shown in the figure are fixed.
Since the optimum position of 8a does not match, adjustment must be made to these compromise positions. For this reason, the amount of winding of the magnetic tape T toward the substrates 11 (inside) cannot be adjusted, and spacing loss is likely to occur.

Therefore, as described above, the thin film combination head 18 has the problem that its head characteristics are often inferior to those of a single thin film magnetic head.

[Means to solve the problem]

In order to solve the above-mentioned problems, a method for manufacturing a thin-film combination head according to the present invention manufactures a thin-film combination head in which a recording head and a reproducing head are integrated after finishing the grinding and polishing process of the tape sliding surface. The method is characterized in that after the recording head and the reproducing head are integrated, the tape sliding surface is polished again.

[Function] If the tape is polished again after integrating the recording head and the reproduction head, the tape sliding surface at the position where both are fixed will fit better to the magnetic tape, eliminating spacing loss. can do.

Therefore, even in the thin film combination head, it is possible to obtain head characteristics that are almost the same as those of a single thin film magnetic head.

〔Example〕

An embodiment of the present invention will be described below based on FIG.

First, as shown in FIG. 1(a), a large number of thin film magnetic head elements 2 are formed on the surface of a substrate 1. The thin film magnetic head elements 2 are formed in a matrix on the surface of the substrate 1 by thin film techniques such as vapor deposition, sputtering, and etching. Next, this is cut along the two-dot chain line A, . . . shown in the figure. Therefore, each cut substrate 1 has four thin film magnetic head elements 2 .

Then, as shown in FIG. 1(b), a protective plate 3 is bonded onto the surface of each cut substrate 1 on which the thin film magnetic head element 2 is formed. The protection plate 3 is made of the same material as the substrate 1, or made of glass or the like. Further, this protective plate 3 covers only the gap portion of each thin film magnetic head element 2 on the substrate 1, and the rear end portion is exposed for connection to a recording/reproducing circuit. The head block 4 is formed by bonding the protective plate 3 to the substrate 1 in this manner. This head block 4 is further finished by grinding the tape sliding surface 5, which is the front side surface of the substrate 1 and the protection plate 3, to a predetermined curvature, and then polishing the tape. A gap between each thin-film magnetic head element 2 is formed in this tape sliding surface 5, and recording and reproduction is performed by sliding the magnetic tape through this gap.

This head block 4 is formed into a recording head block 4a and a reproducing head block 4b, respectively, through the above steps. The recording head block 4a is generally one in which a wire-wound thin film magnetic head element 2 is formed. The reproducing head block 4b is generally one in which a magnetoresistive thin film magnetic head element 2 is formed. As shown in FIG. 1(C), these recording head blocks 4a and reproduction head blocks 4
b, and the board 1 so that the tape sliding surfaces 5 and 5 are lined up side by side.
・Glue the back sides of 1 together to integrate. Therefore, the relative positions of the recording head and the reproducing head are accurately determined by this process. When this integration by bonding is completed, it is then cut along the two-dot chain line A2 .

The thin film combination RAD chip 6 separated into each pair of thin film magnetic head elements 2 by the above process is attached to the head holder 7 with only the tape sliding surfaces 5 protruding as shown in FIG. 1(d). Insert into. Then, a thin film combination head 8 is formed by pouring resin into the gap between the head holders 7 and adhesively fixing them.

When the thin film combination head 8 is formed in this way, as shown in FIG. 1(e), the tape sliding surface 5 is
・Apply tape polishing to 5 again using wrapping tape 9.

At this time, the wrapping tape 9 used is one that produces approximately the same distortion as that experienced by the magnetic tape. That is, the Young's modulus of the magnetic tape is 6 kgf/cffl to 7.
5 kgf/cJ, and the Young's modulus of the wrapping tape 9 is 3 kgf/afl to 4.5 kgf/cyM.
Therefore, the thickness of the wrapping tape 9 is made approximately twice that of the magnetic tape so that the product of Young's modulus and cross-sectional area is constant. If the tape tension during tape polishing is made the same as when the magnetic tape slides on the tape sliding surface 5, the distortion experienced by the lapping tape 9 can be made similar to that of the magnetic tape. Therefore, by this tape polishing process, the magnetic tape and the tape sliding surface 5 become more compatible with each other, and it is possible to eliminate spacing loss.

Through the above steps, it is possible to obtain a thin film combination head 8 having head characteristics comparable to those of a single thin film magnetic head.

〔Effect of the invention〕

As described above, the method for manufacturing a thin film combination head according to the present invention is a method for manufacturing a thin film combination head in which a recording head and a reproducing head are integrated after finishing the grinding and polishing steps of the tape sliding surface. After the recording head and the reproducing head are integrated, the tape sliding surface is polished again.

As a result, the tape sliding surface of the integrated recording head and reproducing head is better adapted to the magnetic tape, so that spacing loss can be eliminated.

Therefore, according to the manufacturing method of the present invention, even in a thin film combination head, it is possible to obtain head characteristics that are almost the same as those of a single thin film magnetic head.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention, in which I41
1m (a) to (e) are perspective views showing each manufacturing process of the thin film combination head. FIG. 2 shows a conventional example, and FIGS. 2(a) to 2(d) are perspective views showing each manufacturing process of a thin film combination head. FIG. 3 is for explaining the cause of the deterioration of the head characteristics of a thin film combination head. FIG. ) is a perspective view showing a method for adjusting a single recording thin film magnetic head, and FIG. 3(c) is a perspective view showing a method for adjusting a thin film combination head. 4a is a recording head block, 4b is a reproduction head block, 5 is a tape sliding surface, 8 is a thin film combination head, and 9 is a wrapping tape. Henzu (b) Ministry 2 (C)

Claims (1)

[Claims] 1. In a method for manufacturing a thin film combination head in which a recording head and a reproducing head are integrated after finishing the grinding and polishing process of the tape sliding surface, after the recording head and the reproducing head are integrated, A method for manufacturing a thin film combination head, comprising performing a tape polishing process on a tape sliding surface.