JPH0350324B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method of manufacturing a magnetic head that is a combination of a recording head and a reproducing head.

BACKGROUND ART Conventionally, in the field of audio equipment, for example, magnetic tape recording and reproducing devices, magnetic heads such as a recording head, a reproducing head, and an erasing head have been individually arranged. At this time, the reproducing head and the recording head are combined into a so-called combination in order to reliably determine their relative positions with respect to the magnetic tape. Combination means that a recording head and a reproducing head are fixed to each other and configured as an integral unit.

It is desirable to apply this type of combination to thin-film magnetic heads manufactured using thin-film technology, but as recording density increases, the mutual interaction between recording heads, reproducing heads, and magnetic tapes becomes more difficult. The accuracy of positioning has become highly accurate. In other words, the azimuth error and track position error between the two heads are in units of 0.011 mm in the analog combination head, but in units of 0.001 mm in the digital combination head. positioning accuracy is required.

FIG. 2 is a process diagram illustrating a method of manufacturing a magnetic head according to the prior art. In the process shown in FIG. 2, thin film head elements 2 formed on one surface of the substrate 1 by thin film techniques such as vapor deposition, sputtering, and etching are arranged in a matrix. A block 3 consisting of such a substrate 1 and thin film head elements 2 is arranged along imaginary lines 4, 5, 6, 7, 7, 6, 7, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 90, 90, 90, 100, 100, 100, 100, 20, 20, 20, 20, 20, 20, 20, 20 levels, so as to separate each thin film head element 2 individually.
Cut along lines 8 and 9.

2 In the process shown in FIG. 2, a protective member 11 made of glass or the like is adhered to the end of each head chip 10 obtained by cutting as described above facing the magnetic tape (not shown). Next, a flexible printed wiring board 12 is bonded to the substrate 1 of the head chip 10, and a plurality of conductive wires 13 are bonded to the thin film head element 2 and the printed wiring board 1.
2. The head chip 10 and the protection member 11 are surrounded by a shield member 1.
4 and 15 are fitted together and fixed.

In the process shown in FIG. 2, the portions of the head chip 10, the protection member 11, and the shield members 14, 15 that face the magnetic tape are machined so that the magnetic tape of the head chip 10, the protection member 11, and the shield members 14, 15 is machined. Tape sliding surface 1a,
11a and 15a are formed. In this way, the magnetic head 16 is constructed.

The structure of the thin film head element 2 of the magnetic head 16 can be roughly divided into those having a structure for a recording head and those having a structure for a reproducing head. The former is referred to as a recording head 17 and the latter as a reproducing head 18. The assembly structures shown in FIGS. 1-3 are constructed in a similar manner. These two heads 17,
18 is fitted into the head holding member 19, as shown in FIG. 2, and fixed by injecting resin into the inside thereof. In this way, the combination head 20
is configured.

3 is a plan view of the combination head 20 in the process of FIG. 2, FIG. 4 is a right side view thereof, and FIG. 5 is a front view of the combination head 20. Various adjustment operations performed when the recording head 17 and the reproducing head 18 are configured as a combination head 20 in the process shown in FIG. 22 will be explained. Referring to FIG. 3, the leading ends (lower ends in FIG. 3) of the recording head 17 and the reproducing head 18 are aligned with a reference line 22 perpendicular to the axis 21 of the combination head 20.
Adjust so that they touch at the same time. This adjustment is called protrusion adjustment.

Next, referring to FIG. 4, adjustments are made so that the leading ends (lower ends in FIG. 4) of the recording head 17 and the reproducing head 18 are commonly perpendicular to the axis 21. That is, in FIG. 4, for example, the reproducing head 18 is at a distance δ from the recording head 17.
When the distance δ protrudes, the distance δ is adjusted to zero. This adjustment is called tilt adjustment.

Referring to FIG. 5, the alignment directions (indicated by virtual straight lines 24 and 25) of the magnetic gap layers 23 of the recording head 17 and the reproducing head 18 are adjusted so that they are parallel to each other. This adjustment is called azimuth adjustment. Furthermore, electromagnetic conversion gap layers 23a and 23b are formed in the recording head 17 and the reproducing head 18, respectively, by the thin film head element 2.

The electromagnetic conversion gap layer 23a contains n recording tracks 50(1), 50(2), to 50(n), and the electromagnetic conversion gap layer 23b simultaneously contains reproduction tracks 51(1), 51. n playback tracks (2) to 51(n) are arranged. Here, for example, a virtual straight line 5 connecting the centroid of the first recording track 50(1) and the centroid of the reproduction track 51(1)
The mutual positions of the recording head 17 and the reproducing head 18 are adjusted so that the head 2 is perpendicular to the virtual straight line 24 or the virtual straight line 25. That is, the recording head 17
For example, the reproduction head 18 is moved in the B1 direction, and the reproduction head 18 is moved in the B2 direction, for example. This adjustment is called track adjustment. In these various adjustment operations, extremely high positioning accuracy is required as described above.

Problems to be Solved by the Invention Therefore, the conventional method of manufacturing the combination head 20 has the following problems.

When the recording head 17 and the reproducing head 18 are configured into a combination head 20, extremely high positioning accuracy is required for azimuth adjustment and track adjustment. Also, the recording head 17 and playback head 1 have been adjusted.
The operation of bonding together the parts 8 and 8 to form the combination head 20 also requires extremely high precision.

Various adjustment operations such as those described above must be performed for each combination head 20 manufactured, resulting in low work efficiency.

Head chip 10 with shield members 14 and 15
After enclosing it, attach it to the head holding member 19.
Since the combination head 20 is constructed by fitting inside, there are restrictions on external dimensions, making it difficult to downsize.

Another conventional example is JP-A-59-24418. In this conventional example, in order to facilitate azimuth adjustment during the manufacture of magnetic head elements, the recording and reproducing substrates are fixed by being pressed against the reference surface of a frame-shaped member into which these substrates are inserted. I try to do that. In such a conventional example, although the adjustment work is facilitated when adjusting the azimuth for each combination head, the azimuth adjustment must be performed for each combination head, which increases the number of manufacturing steps. The problem is that it is not possible to increase the production quantity per unit time.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned problems, to make it possible to manufacture a magnetic head with high quality and reduced external dimensions without unnecessarily increasing the precision during manufacturing, and to improve the accuracy during manufacturing. An object of the present invention is to provide a method for manufacturing a magnetic head, which allows various adjustment operations to be performed simultaneously on a plurality of combination heads.

Means for Solving the Problems The present invention provides a method for reproducing a plurality of tracks in one direction.
an eleventh substrate in which a plurality of magnetic detection elements arranged in parallel at a constant pitch are arranged in parallel at intervals in the arrangement direction; and a plurality of recording tracks in one direction are arranged in the same pitch as the pitch. a second substrate in which a plurality of magnetic recording elements arranged in parallel in a pitch are arranged in parallel in the arrangement direction with the same spacing as the spacing; A surface of the substrate on which the electromagnetic conversion gap portion of the magnetic sensing element or the magnetic recording element is formed is processed into a curved shape, and a shield extending in the arrangement direction is provided between the first substrate and the second substrate. Positioning and integrally fixing each track position of both the substrates with a plate interposed therebetween, and forming a structure in which the first substrate and the second substrate are integrally fixed, in a direction that intersects with the arrangement direction. This method of manufacturing a magnetic head is characterized in that a multi-track combination head constituted by a pair of magnetic sensing element and magnetic recording element is obtained by cutting in the direction of the head.

Effects According to the present invention, a first substrate has a plurality of magnetic detection elements arranged in one direction at a constant pitch and a plurality of magnetic detection elements arranged in parallel at intervals in the arrangement direction. , a second magnetic recording element in which a plurality of magnetic recording elements in which a plurality of recording tracks are arranged in parallel in one direction at the same pitch as the above-mentioned pitch is arranged in parallel in the arrangement direction with the same spacing as the above-mentioned spacing; Prepare the substrate.

In these first and second substrates, the surface on which the electromagnetic conversion gap portion of the magnetic sensing element or the magnetic recording element is formed is processed into a curved shape, so that there is a gap between the first and second substrates. , with a shield plate extending along the arrangement direction interposed therebetween, the first
and a second substrate are positioned at each track location and integrally secured to each other. By cutting the first and second substrates fixed in this way in a direction intersecting the arrangement direction into each of the magnetic sensing elements and magnetic recording elements, a pair of magnetic sensing elements and magnetic recording elements can be formed. A multi-track combination head is obtained.

Therefore, adjustment related to the relative position of each track between each magnetic sensing element and each magnetic recording element in each multi-track combination head is performed by fixing the aforementioned first and second substrates with a shield plate interposed therebetween. This is done all at once as positioning work in the process of

Therefore, compared to the case where the positioning work is performed for each individual pair of magnetic detection element and magnetic recording element, the work process is greatly simplified, and the multi-track combination can be manufactured within the same manufacturing time. The number of heads can be increased, and production efficiency is significantly improved. Furthermore, the external dimensions of the manufactured magnetic head can be reduced and the quality can be improved.

Embodiment FIG. 1 is a process diagram of an embodiment of the present invention. A method of manufacturing the magnetic head of this embodiment will be explained with reference to FIG. In the process shown in FIG. 1, a thin film head element 32 is formed on a substrate 31 made of, for example, ceramics using thin film techniques used in manufacturing semiconductor devices, such as vapor deposition, sputtering, and etching. Arrange them in a matrix with proper alignment. This board 31
is a virtual straight line 33, 3 along one direction of arrangement.
Cut along lines 4 and 35. In this way, a block 36 is obtained in which, for example, four thin film head elements 32 are formed.

The basic structure of the thin film head element 32 is to arrange a coil covered with an electrical insulator between mutually opposing magnetic pole layers made of, for example, permalloy, and to form an electromagnetic conversion gap between the magnetic pole layers.
A magnetic recording element that records information via this electromagnetic conversion gap and a magnetoresistive element coated with an electrical insulator are arranged between mutually opposing magnetic pole layers made of permalloy or the like. They can be roughly divided into magnetic sensing elements, which form an electromagnetic conversion gap in the magnetic field and reproduce information via this electromagnetic conversion gap. Here, thin film head elements of the same type are formed on one substrate 31 so that magnetic recording elements and magnetic detection elements do not coexist. Therefore, the block 36 has two types of blocks: a recording head block 40 which is the second substrate, and a reproducing head block 41 which is the first substrate. Since the detailed configurations of the magnetic detection element and the magnetic recording element are not directly related to the present invention, the above description will be kept and the details will be omitted.

In the step of FIG. 1, the end portion 36a facing the magnetic tape (not shown) of the book 36 obtained in the step of FIG. The protective member 37 is adhered. The end portion 36a to which the protective member 37 is bonded is machined, and the magnetic tape sliding surface 3, which is the surface formed by the electromagnetic conversion gap portion, is machined.
8 and 39 are formed into curved shapes.

In the step shown in FIG. 1, the recording head block 40 and the reproducing head block 41 obtained in the steps up to FIG. 1 are subjected to position adjustment operations as described below.

At this time, the surfaces 40a and 41a of the recording head block 40 and the reproducing head block 41 facing the shield plate 42, and the recording head block 40 and the reproducing head block 41 of the shield plate 42
surfaces 42a and 42b facing the recording head, and a surface 40b on which the thin film head element 32 of the recording head block 40 is formed.
and similar surface 4 of block 41 for playback head.
A total of six sides of 1b are precision lapped. The flatness of these six surfaces is assumed to be in units of 0.001 mm. Therefore, even if the azimuth adjustment in the process shown in Fig. 1 is carried out by parallel movement of the six surfaces described above, the error will be According to the flatness of the plane,
It falls within the permissible error range of positioning accuracy in units of 0.001mm mentioned above. In other words, azimuth adjustment can be omitted.

Therefore, only the rack position adjustment described with reference to FIG. 5 requires highly accurate position adjustment. To perform this track adjustment, move the recording head block 40, the reproducing head block 41, and the shield plate 42 to the positions indicated by the arrows A1 and 42.
This is done by moving in the A2 direction. Even in such parallel movement, the above-mentioned azimuth error is still within the allowable error range. Therefore, the track position can be easily adjusted. Note that before performing the adjustment, an adhesive is applied between each of the recording head block 40, the reproducing head block 41, and the shield plate 42, and after the adjustment, the adhesive is hardened and bonded and fixed to each other.

In the step shown in FIG. 1, the recording head block 40, read head block 41, shield plate 42, etc. obtained in the step shown in FIG. ,4
Cut at 4,45. In this way, a combination head chip 46 is obtained. A flexible printed wiring board 47,
Glue 48. The printed wiring boards 47, 48 and the thin film head element 32 are connected by bonding wires 39 by pressure bonding.

In the process shown in FIG. 1, the combination head chip 46 obtained in FIG.
It is inserted into the body and fixed by injecting resin or the like. In this way, a combination head 51 which is a multi-track combination head can be obtained.

According to such a manufacturing method, in the prior art magnetic head manufacturing method described with reference to FIG. 2, the seed members 14 and 15 shown in FIG.
Since the outer dimensions of the combination head 51 can be reduced, the outer dimensions of the combination head 51 can be reduced.

Furthermore, as mentioned above, the recording head block 4
0 and surfaces 40a and 41a facing the shield plate 42 of the playback head block 411, and the shield plate 42
The surfaces 42a and 42b facing the recording head block 40 and the reproducing head block 41, the surface 40b of the recording head block 40 on which the thin film head element 32 is formed, and the reproducing head block 41.
The flatness of a total of six similar surfaces 41b is
The azimuth adjustment can be omitted by performing precision lap processing in advance in units of 0.001 mm, and the track can be adjusted by mutually moving the recording head block 40, the reproducing head block 41, and the shield plate 42 parallel to each other. Adjustments can be made.

As a result, the azimuth adjustment and the track adjustment of the thin film magnetic head element 32 included in each block 40, 41 can be performed at once, and the manufacturing process is greatly simplified, and the combination head chip can be manufactured within the same time. 46, that is, the number of combination heads 51 can be greatly increased.

Therefore, the process of manufacturing the magnetic head can be simplified and production efficiency can be significantly improved. Furthermore, the external dimensions of the manufactured magnetic head can be reduced and the quality can be improved.

Although the above-described embodiments have been described with respect to a magnetic head used in a magnetic tape recording/reproducing apparatus, the present invention can be widely implemented in relation to various apparatuses that record/reproduce information using magnetism.

Effects According to the present invention as described above, the first and second
The first and second substrates are positioned at each track position and integrally fixed to each other by interposing a shield plate extending along the arrangement direction of the substrates. By cutting the thus fixed first and second substrates in a direction crossing the arrangement direction for each of the magnetic sensing elements and magnetic recording elements, a pair of magnetic sensing elements and magnetic recording elements can be separated. A multi-track combination head is obtained.

Therefore, adjustment related to the relative position of each track between each magnetic sensing element and each magnetic recording element in each multi-track combination head is performed by fixing the aforementioned first and second substrates with a shield plate interposed therebetween. This is done all at once as positioning work in the process of Therefore, compared to the case where the positioning work is performed for each pair of magnetic sensing element and magnetic recording element, the work process is greatly simplified, and the multi-track combination can be manufactured within the same manufacturing time. The quantity of long heads can be increased, and production efficiency is significantly improved. Furthermore, the external dimensions of the manufactured magnetic head can be reduced and the quality can be improved.

[Brief explanation of drawings]

FIG. 1 is a process diagram illustrating a method for manufacturing a magnetic head according to an embodiment of the present invention, FIG. 2 is a process diagram illustrating a method for manufacturing a magnetic head according to the prior art, and FIG. 4 is a right side view of the combination head 20 of FIG. 3, and FIG. 5 is a front view of the combination head 20 of FIG. 3. 31...Substrate, 32...Thin film head element, 37
...Protective member, 40... Recording head block,
41... Reproduction head block, 42... Shield plate, 47, 48... Printed wiring board, 51... Combination head.

Claims (1)

[Scope of Claims] 1. A first magnetic detection element in which a plurality of reproduction tracks in one direction are arranged in parallel at a constant pitch, and a plurality of magnetic detection elements are arranged in parallel at intervals in the arrangement direction. a substrate, and a plurality of magnetic recording elements in which a plurality of recording tracks are arranged in parallel in one direction at the same pitch as the pitch, and a plurality of magnetic recording elements are arranged in parallel in the arrangement direction with the same spacing as the spacing. preparing a second substrate, processing the surfaces of the first and second substrates on which the electromagnetic conversion gap portion of the magnetic sensing element or the magnetic recording element is formed into a curved shape; A shield plate extending along the arrangement direction is interposed between the first substrate and the second substrate to position and integrally fix each track position of both the substrates, and the first substrate and the second substrate are fixed together. A multi-track combination head composed of a pair of magnetic sensing elements and a magnetic recording element is obtained by cutting a structure formed by integrally fixing the elements in a direction intersecting the arrangement direction. A method of manufacturing a magnetic head characterized by: