JPH11203624A - Manufacture of thin film magnetic head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the manufacturing method of the double azimuth type thin film magnetic head in which the distances from the mounting reference surface to each track end of a pair of head chips are made equal and the mass- productivity is made superior. SOLUTION: A pair of top and bottom head core patterns 3 and 3, which are exposed to a top surface 2a of a magnetic gap surface 3a parallel to the forming surface of a thin film 7 of a substrate and a bottom surface, are formed on the substrate in mutually opposite directions with a prescribed interval. Then, the side section of the substrate is cut for every unit, which includes a pair of the top and bottom head core patterns 3 and 3, so that a prescribed azimuth angle is given with respect to the patterns 3 and 3. Then, the center between the patterns 3 and 3 of the unit is cut to form a pair of top and bottom head chips 5 and 5. Then, each cut surface 5a of the side section of the chips 5 and 5 is pasted on a mounting reference surface 6a of a head base 6 to assemble a thin film magnetic head 1.

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 thin film magnetic head suitable for use in a magnetic recording / reproducing apparatus such as a video tape recorder (VTR), and more particularly to a double azimuth type thin film having positive and negative azimuth angles. The present invention relates to a method for manufacturing a magnetic head.

[0002]

2. Description of the Related Art For example, a helical scan type VTR
, A large number of thin film magnetic heads are mounted, and the thin film magnetic heads are switched according to the application. The method of manufacturing this thin-film magnetic head will be specifically described with reference to FIGS. 3A and 3B and FIG. 4. First, as shown in FIGS. 3A and 3B, a pair of rectangular plates are formed. Each front 2 of the substrates 2 ', 2 "
The head core pattern 3 in which the magnetic gap surface 3a parallel to the surface on which the protective film (thin film) 7 coated on the upper surface c is formed is exposed on each upper surface 2a serving as the tape sliding surface (recording medium sliding surface). A plurality of substrates are formed on the pair of substrates 2 ', 2 "each time. Next, one of the substrates 2' is provided with a predetermined positive or negative azimuth angle (+ θ, -θ) to each head core pattern 3. Is cut sequentially at predetermined intervals to form a head chip 5 ', and the left side of the other substrate 2 "is cut sequentially at predetermined intervals to form a head chip 5". By attaching each cut surface 5a of the head chips 5 ', 5 "to the mounting reference surface 6a of the head base 6 with an adhesive or the like, a double azimuth type thin film magnetic head 1' is assembled as shown in FIG. .

The pair of substrates 2 'and 2 "are non-magnetic such as ceramics. After a head core pattern 3 made of cobalt zircon or the like is formed on each front surface 2c by photolithography or etching, respectively. And a protective film 7. Further, in the center of the head base 6, there is formed a side U-shaped slit 6b for adjusting a pair of head chips 5 'and 5 ".
Further, the cut surfaces 5a facing each other when the pair of head chips 5 'and 5 "are cut are parallel to each other.

Incidentally, similar techniques relating to a method of manufacturing the thin-film magnetic head 1 'are disclosed in Japanese Patent No. 2569018, Japanese Patent Laid-Open No. 1-182907, and Japanese Patent Laid-Open No. 63-22040.
No. 7, for example.

[0005]

In the method of manufacturing the conventional thin-film magnetic head 1 ', the head chips 5', 5 "having positive and negative azimuth angles (+ .theta., -.Theta.) On the mounting reference surface 6a of the head base 6. Are assembled so that the track ends (the center ends of the magnetic gap surfaces 3a of the left and right head core patterns 3) of the head chips 5 ', 5 "are arranged at the same distance from the mounting reference surface 6a. However, in the head chips 5 ', 5 ", in which the sides of the substrates 2', 2" are inclined at a predetermined angle and cut in parallel to give a positive or negative azimuth angle, the head chips 5 ', 5 " Since each of the substrates 2 'and 2 "has been cut, as shown in FIG. 4, the distance H from the mounting reference surface 6a of the head base 6 to each track end of the pair of head chips 5' and 5".
r and Hl did not match. Therefore, each of the obtained head chips 5 ',
A large adjustment work such as tilt adjustment is indispensable by selecting a combination matching the shape and dimensions from 5 ″ and deforming the head base 6 through the slit 6b.
Mass production was inferior.

Accordingly, the present invention has been made to solve the above-mentioned problem, and the distances from the mounting reference surface of the head base to the respective track ends of the pair of head chips can be made equal to achieve mass productivity. An object of the present invention is to provide a method of manufacturing an excellent double azimuth type thin film magnetic head.

[0007]

According to the first aspect of the present invention, a plurality of head core patterns having a magnetic gap surface parallel to a thin film forming surface of a rectangular plate-like substrate are formed on the substrate at predetermined intervals. Next, side portions of the substrate are cut at predetermined intervals so as to give a predetermined azimuth angle to each of the head core patterns to form head chips. In a method of manufacturing a thin-film magnetic head, wherein the thin-film magnetic head is manufactured by attaching the magnetic gap surface to a mounting reference surface of a base, the magnetic gap surface is exposed to upper and lower surfaces of a recording medium sliding surface of the substrate. A plurality of pairs of head core patterns are formed on the substrate in opposite directions and at predetermined intervals, and then a predetermined azimuth angle is given to each of the pair of upper and lower head core patterns. Cut each side of the substrate for each including the upper and lower pair of head core pattern unit,
Next, the center between the pair of upper and lower head core patterns of this unit is cut to form a pair of upper and lower head chips, respectively. A double azimuth type thin-film magnetic head is manufactured by attaching the thin film magnetic head to a mounting reference surface.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view of a double azimuth type thin film magnetic head assembled by a method of manufacturing a thin film magnetic head according to one embodiment of the present invention, and FIG. 2A is a perspective view of a substrate used in the thin film magnetic head. FIG. 2B is a perspective view of one unit obtained by cutting the same substrate.

The double azimuth type thin-film magnetic head 1 shown in FIG. 1 is mounted on, for example, a rotary head drum (not shown) used in a helical scan type VTR, and is assembled by a manufacturing method described below.

That is, as shown in FIG. 2 (a), the magnetic gap surface 3a parallel to the surface on which the protective film (thin film) 7 coated on the front surface 2c of the rectangular plate-shaped substrate 2 slides on the tape. A pair of upper and lower head core patterns 3, 3 exposed on the upper and lower surfaces 2a, 2b as surfaces (recording medium sliding surfaces), respectively.
Are formed in a direction opposite to the front surface 2c side of the substrate 2 and at predetermined intervals. Next, a pair of upper and lower head core patterns 3, 3 is provided with a pair of upper and lower left sides of the substrate 2 so as to give a predetermined azimuth angle (positive and negative azimuth angles + θ, -θ after assembly). Is cut for each unit 4 including the head core patterns 3 and 3. Next, as shown in FIG. 2B, the center between the pair of upper and lower head core patterns 3 and 3 of the unit 4 is cut to form a pair of upper and lower head chips 5 and 5, respectively. The cut surface at the center is indicated by reference numeral 5b in FIG. 2 (b)). Finally, each cut surface 5a on the left side of the pair of upper and lower head chips 5, 5 is attached to the mounting reference surface 6a of the head base 6.
The double azimuth type thin-film magnetic head 1 is assembled as shown in FIG.

The substrate 2 is a non-magnetic material such as ceramic. A head core pattern 3 as a magnetic core made of cobalt zircon or the like, a thin film coil (not shown), etc. are formed on the front surface 2c by photolithography or etching. Later, it is covered with a protective film 7. In the center of the head base 6, there is formed a side U-shaped slit 6b for adjusting the tilt of the pair of head chips 5 and 5. Further, the substrate 2 shown in FIG.
The opposing cut surfaces 5a of the pair of head chips 5, 5 that are vertically continuous in the cutting for making the unit 4 are parallel to each other.

As described above, when the head core pattern 3 is formed on the front surface 2c of the substrate 2, a pair of rows is previously arranged vertically adjacent to each other, and the pair of upper and lower head core patterns 3 and 3 are opposed to each other. When cutting is performed by giving a predetermined azimuth angle (θ), the cutting is performed simultaneously with the paired rows arranged vertically as shown in FIG. 2A. Thus, the pair of upper and lower head chips 5 and 5 respectively have positive and negative azimuth angles (+ θ,-
θ), and are formed by the same cut surface 5a of one unit 4, so that the pair of upper and lower head chips 5, 5 are also separated from the mounting reference surface 6a of the head base 6 by the pair of head chips 5. , 5 are equal to each other.

Thereafter, even after the center of the unit 4 is cut to separate and cut the pair of upper and lower head chips 5, 5, the combination of the pair of upper and lower head chips 5, 5 is maintained as a pair, as shown in FIG. By attaching the cut surfaces 5a of the pair of upper and lower head chips 5 and 5 to the mounting reference surface 6a of the head base 6, a pair of head chips are mounted from the mounting reference surface 6a of the head base 6 as shown in FIG. It is possible to assemble the thin-film magnetic head 1 having positive and negative azimuth angles with equal distances H to the respective track ends. As a result, unlike the conventional method in which the cutting process is performed for each of the positive and negative azimuth angles, a pair of head chips 5 and 5 having the positive and negative azimuth angles are formed by a single cutting process, so that each of the cut surfaces 5a is cut off. The thin-film magnetic head 1 having the same distance H to the track end can be easily assembled, a combination of head chips having similar processing finishes, which has been indispensable in the past, and a pair of head bases 6 deformed through the slits 6b. The work of adjusting the position of the head chips 5 and 5 is unnecessary or finely adjusted.
Mass productivity is improved.

According to the above-described embodiment, a method of manufacturing a double azimuth type thin film magnetic head used in a helical scan type VTR has been described. However, it is needless to say that the method can be applied to a thin film magnetic head used in a magnetic disk device or the like. It is.

[0016]

As described above, according to the method of manufacturing a thin film magnetic head of the first aspect of the present invention, the distances from the reference mounting surface of the head base to the track ends of the pair of head chips can be made equal. As a result, the mass productivity of the double azimuth type thin film magnetic head can be further improved. Further, it is unnecessary to perform the adjustment work of the pair of head chips or fine adjustment is required, and a high-precision double azimuth type thin-film magnetic head can be provided at low cost.

[Brief description of the drawings]

FIG. 1 is a front view of a double azimuth type thin film magnetic head assembled by a method of manufacturing a thin film magnetic head according to an embodiment of the present invention.

FIG. 2A is a perspective view of a substrate used for the thin-film magnetic head, and FIG. 2B is a perspective view of one unit obtained by cutting the substrate.

FIG. 3A is a perspective view of one of a pair of substrates used in a conventional thin-film magnetic head, and FIG. 3B is a perspective view of the other of the same pair of substrates.

FIG. 4 is a front view of the double azimuth type thin film magnetic head of the conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Double azimuth type thin film magnetic head 2 Substrate 2a Upper surface (recording medium sliding surface) 2b Lower surface (recording medium sliding surface) 3,3 Upper and lower pair of head core patterns 3a Magnetic gap surface 4 Unit 5,5 Upper and lower pair of heads Chip 5a Cutting surface 6 Head base 6a Mounting reference surface 7 Protective film (thin film) + θ, -θ Azimuth angle

Claims (1)

[Claims] 1. A plurality of head core patterns having a magnetic gap surface parallel to a thin film forming surface of a rectangular plate-like substrate are formed on the substrate at predetermined intervals, and then a predetermined number of head core patterns are formed for each of the head core patterns. The side portions of the substrate are cut at predetermined intervals so as to give an azimuth angle of, and a head chip is formed. Then, the cut surface of the head chip is attached to a mounting reference surface of a head base to form a thin film magnetic head. A method of manufacturing a thin-film magnetic head for manufacturing a head, comprising: a pair of upper and lower head core patterns having the magnetic gap surface exposed on upper and lower surfaces as a recording medium sliding surface of the substrate, in opposite directions; A plurality of the upper and lower head core patterns are formed on the substrate at predetermined intervals, and then the side portions of the substrate are joined to the upper and lower pair of head core patterns so as to give a predetermined azimuth angle to each of the upper and lower head core patterns. Each of the units including the core pattern is cut, and then the center between the pair of upper and lower head core patterns of the unit is cut to form a pair of upper and lower head chips, respectively. A method for manufacturing a double azimuth type thin film magnetic head by affixing the respective cut surfaces on the side portions to the mounting reference surface of the head base.