JPS62234211A - Production of vertical magnetic head - Google Patents

Abstract

PURPOSE:To secure the mechanical strength of an exciting magnetic core part, and to improve the slide characteristic of a medium by reinforcing the root of the magnetic core part with a nonmagnetic reinforcing material left filled in both sides of the magnetic core part to widen the adhesion area. CONSTITUTION:Two packing grooves 20a are formed on a soft magnetic material block 20 of a vertical magnetic head, and a nonmagnetic reinforcing material 21 is filled in grooves 21a. The block 20 is sliced in the direction of an arrow to obtain three single substance blocks 20. A fitting groove 22a is formed which has a depth to reach the center part from end faces in the lengthwise direction of grooves 21a of the block 20, and an L-shaped nonmagnetic material 23a is fitted to the groove 22a and is adhered. A fitting groove 22b reaching the center part from the opposite side is formed, and an L-shaped nonmagnetic material 23b is fitted and adhered similarly. A composite body block 24 where nonmagnetic materials 23a and 23b face each other with the exciting magnetic core part of the block 20 between them is formed, thus securing the mechanical strength of the magnetic core part and improving the slide characteristic of the medium.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention employs a perpendicular magnetic recording method in which magnetic recording is performed by magnetizing the medium in the 17-lateral direction perpendicular to the surface of the recording medium with a 21W structure. The present invention relates to a method of manufacturing a main pole excitation type perpendicular magnetic head used in a 7Q7 bead disk device, and particularly relates to a method of manufacturing a main pole excitation type perpendicular magnetic head using a coil post-insertion method.

[Prior art 1] In manufacturing the above-mentioned perpendicular magnetic head, generally both the main pole part and the soft magnetic material core part having the excitation magnetic core part in the center are made into large pieces and joined together into one piece. ,
Since this is sliced to form a single head, the excitation magnetic core to which the winding is applied has a closed shape, so
The coil cannot be attached to the excitation magnetic core by VC unless it is manually wound. For this reason, not only the processability and assemblability are poor, but also the coil cannot be wound in an aligned manner, and the inductance cannot be reduced, which is an obstacle to achieving high sensitivity.

In order to solve this problem, the tip side of the head with the unclosed excitation magnetic core is formed first, and after polishing the head tip surface, a coil wound in an aligned manner with a winding rod etc. is attached to the excitation magnetic core. A post-insertion manufacturing method was developed in which a back core made of soft magnetic material is bonded to the lower surface of the tip end of the head. Figure 12(a) shows the manufacturing process of a conventional perpendicular magnetic head using this coil post-insertion method.
This will be explained by (j). First, two rectangular block-shaped non-magnetic materials such as crystallized glass and ceramics 1.1
After an amorphous soft magnetic thin film is deposited on one side of the main pole film 2 by etching or the like, a plurality of main pole films 2 are formed by etching or the like, leaving magnetic ms in the form of a-stripes.
), the two valve magnetic materials 1 and 1 are adhesively bonded to each other to form the main magnetic pole part base 3 (Figure (b)), and this is sliced thinly and polished on both sides to form a plurality of plate-like pieces. The main magnetic pole part 4 is formed in the same figure (C)), - force, ferrite,
Two parallel grooves 5 lit 5 a are formed on the upper surface of a rectangular block-shaped soft magnetic material such as permalloy as escape grooves in the excitation magnetic core forming process described later, thereby forming a plurality of block-shaped soft magnetic cores. 5 is also formed in the same figure (C
)) This soft magnetic core 5 and the main magnetic pole portion 4 are adhesively bonded to form a bonded block 6. The bonded block 6 is sliced vertically as shown in the arrow in the figure (d)) to form a single head. A bonded thin piece body 7 having the main magnetic pole part 4 and the soft magnetic core 5 integrally is formed (FIG. 1(e)), while a non-magnetic material such as glass is formed into a concave shape with a winding space groove 8a. The bonded thin piece body 7 is sandwiched and bonded between two sliders 8 to form the head upper body 9 (FIG. 1(g)).Then, the remaining portion of the groove in the soft magnetic core 5 is bored out. Then, the excitation magnetic core part 5b is formed in a state where it is separated by the both side parts 5c and the separation groove 5d (FIG. 2(b), FIG. 2(g),
11) is an inverted perspective view). In addition, the excitation magnetic core part 5
If the magnetic flux return path ridges 5c are connected by a soft magnetic material, the magnetic flux will not concentrate and will spread out, making it impossible to function effectively as a perpendicular magnetic head. It is necessary to separate it from 5c as described above. Next, the upper surface of the head upper body (i.e., the above-mentioned head end side portion) 9, that is, the head end surface, is polished to a hemispherical mirror finish by lapping or the like, as shown in FIG.
), then the coil 10 wound in an orderly manner with windings m etc. is attached to the excitation magnetic core g5sb from the back side, the back core 11 made of soft magnetic material is adhesively bonded to the back side of the head upper body 9, and this is attached to the terminal board. 12 etc., and solder the ends of the coils 10 to the terminals to complete the construction of the vertical magnetic head 51.

[Problems to be Solved by the Invention] The above conventional method has advantages such as being able to reduce inductance because it can use a fill that has been wound in alignment with a winding machine, but it has the following drawbacks. . That is, (i) the excitation magnetic core part 5b at the center of the soft magnetic core 5 is bonded to the main magnetic pole part 4 in a very narrow area, so the mechanical strength of the excitation magnetic core part 5b (the bonding to the main magnetic pole part) is strength) is low.

(ii) Head tip, that is, head upper body 9
The shape of is a three-dimensional structure consisting of the joining thin piece body 7 and the sliders 8 on both sides thereof.
Since it has a layered structure and the adhesive joints exist near the center, there are joints on both sides of the joint thin piece body 7 at the almost central part that slides with the medium at the head tip. However, since the adhesive layer at the joint is softer than other parts, when lapping etc. is applied, a slight dent occurs and a step is created, causing a corner on the upper edge of the joint g end surface that sandwiches the adhesive layer. Therefore, there is a drawback in terms of media sliding characteristics, which may cause damage to the media.

(iii) When bonding the thin piece body 7 and the slider 8 to a jig or the like and then adhesively bonding them to form the head upper body 9 of the 3M structure, do not bond them so that their upper and lower surfaces are strictly parallel. This is difficult and tends to cause taper between the upper and lower surfaces, albeit slightly. In this case, even if lapping is performed after bonding, a taper will remain between the upper and lower surfaces, making it difficult to correctly position the main pole film at the apex of the spherical surface during head tip polishing, making it difficult to obtain highly accurate shapes and dimensions. do not have.

This invention was made in order to eliminate the above-mentioned conventional drawbacks, and has a high mechanical strength of the excitation magnetic core, good media sliding characteristics, and easy production of a perpendicular magnetic head with a highly accurate shape and size. The purpose is to provide a manufacturing method that can obtain the desired results.

[Means for Solving the Problems] The present invention, which solves the above-mentioned problems, includes the following steps: forming two rows of filling grooves in a rectangular parallelepiped-shaped soft magnetic block, and filling the filling grooves with a non-magnetic reinforcing material. A fitting groove is formed in the soft magnetic block filled with the magnetic reinforcing material, and the fitting groove has a depth reaching from one end side in the longitudinal direction of the filling groove to near the center, and an L-shaped non-magnetic material is fitted into this fitting groove. A composite block is formed by gluing, then forming a fitting groove with a depth reaching near the center from the other end, and fitting and gluing an L-shaped non-magnetic material into this fitting groove. A step of forming a thin plate main pole part by sandwiching and integrating a main pole film between the end faces of a pair of thin plate nonmagnetic materials by double-sided polishing, and joining this thin plate main pole part to the composite block. After joining the flaky main pole part, or forming two rows of winding space grooves along the length direction of the filling groove from the surface opposite to the filling groove on the composite block of the moe to be joined. a step of forming an excitation magnetic core and a winding space; a step of polishing and finishing the upper surface of the thin plate-like main pole portion joined to the composite block; and after finishing the polishing, align the winding! ! This method of manufacturing a perpendicular magnetic head includes the steps of: inserting the coil into the excitation magnetic core, and then joining a soft magnetic back core.

[Function 1] In the above manufacturing method, the non-magnetic reinforcing material filled on both sides of the excitation magnetic core serves as reinforcement for the roots of the excitation magnetic core, and also increases the bonding area and improves the mechanical strength of the excitation magnetic core. Ensuring strength (bonding strength to the main magnetic pole part)≦ Since the main magnetic pole part is wide and the adhesive joint is not located near the center of the medium sliding surface, the medium sliding characteristics are good.

Since the outer shape of the composite block is defined not by the JvI groove but by the integrated soft magnetic block, a reliable reference plane can be set during machining, and high precision machining is possible.

[Example] Fig. 1 is a perspective view of a perpendicular magnetic head manufactured by the manufacturing method of the present invention.
This will be explained with reference to FIGS.

First, as shown in FIG. 2, two rows of filling grooves 20a are formed in a rectangular parallelepiped soft magnetic block 20 made of 7-elite, etc., and the filling grooves 20a are filled with a non-magnetic reinforcing material 21 such as glass. FIG. 2 shows an example of three pieces, for example, by slicing the soft magnetic block 20 filled with a non-magnetic reinforcing material (reinforced glass) 21 in the direction of the arrow (in the direction of the arrow) to obtain the single soft magnetic block 20 shown in FIG. Note: Figure 3 shows the raised position.

Next, as shown in FIG. 4, a fitting groove 22a is formed in the soft magnetic block 20 of FIG. 3 from one end surface in the longitudinal direction of the filling groove (the top surface in FIG. 4) to a depth that reaches nearly medium heat. An L-shaped non-magnetic material 23a such as glass as shown in FIG. 5 is fitted into this fitting groove 22a and adhesively bonded. Next, from the opposite side, as shown in FIG. 6, a fitting groove 22b with a depth reaching near the center is formed, and an L-shaped non-magnetic material having the same shape as the above-mentioned non-magnetic material 23a is formed in this fitting groove 2211. When the magnetic material 23b is fitted and adhesively bonded,
f: tS7 As shown in the figure, a pair of diamond-shaped nonmagnetic materials 23a
, 23b are formed to face each other with a portion (arrow (A)) of the soft magnetic block 20 that is to become the excitation magnetic core sandwiched therebetween. And this complex block 24
Polish the top and bottom surfaces of the board to a properly parallel plane using rough polishing, etc. Since the soft magnetic block 20 constituting the composite block 24 is integrated, this process of polishing the upper and lower surfaces in parallel can obtain parallel surfaces with extremely high precision.

On the other hand, as shown in FIG. 8, a pair of thin plate-like nonmagnetic materials 25
．． A main magnetic pole film 26 such as an amorphous soft magnetic thin film is sandwiched and integrated between the end faces of the thin plate main magnetic pole $27. This process adopts almost the same method as the method of forming the plate-shaped main pole part 4 described in the conventional example shown in Figs. .

However, the thin plate main pole g27 formed here is
It is a single body having one membrane 2G, and the composite block 24
It has the same area as the main pole, and is much wider than the conventional one as a single main pole.

Next, the main magnetic pole part 27 shown in FIG. 8 is placed on the upper surface of the composite block 24 shown in FIG. When the head upper body 28 is properly aligned and bonded with adhesive, the head upper body 28 as shown in FIG. 9 is formed. From the surface opposite to the main pole & 1S27 (that is, the surface opposite to the main pole & 1S27), groove the part shown by the two-point M line in Fig. 9 in the direction of the arrow (in the length direction of the filling groove) to create a groove for the winding space. Groove 29
As shown in FIG. 10, an excitation magnetic core 30 and a winding space 31 around the excitation magnetic core 30 are formed. Further, return path portions 32 having a large area are formed on both sides of the excitation magnetic core portion 30.

Next, the upper surface of the head upper body 28 (the lower surface in FIG. 10, the surface of the main pole portion 27) on which the excitation magnetic core portion 30 and the like are formed is polished into a spherical shape by lapping or the like so as to serve as a medium sliding surface. Finish. In this case, i? Since the upper and lower surfaces of the composite block 24 are machined to be parallel with high precision, it is possible to polish the surface of the main magnetic pole part 27 into a desired spherical shape without bias when lapping the surface.

Next, as shown in FIG. 11, the coil 33 wound in an orderly manner by a winding machine is inserted into the excitation magnetic core 30, and then the back core 34 made of soft magnetic material is bonded to the lower surface of the head upper body 28, as shown in the mi diagram. The perpendicular magnetic head shown is completed.

In the above manufacturing process, the excitation magnetic core part 30 is not adhesively bonded to the main magnetic through-hole part 27 only by the cross-sectional area of the excitation magnetic core part as in the conventional case, but is integrated with reinforcement filled on both sides. Since the reinforcing glass 21 is adhesively bonded to the lath 21, the reinforcing glass 21 serves as a reinforcement for the base of the excitation magnetic core 30, and the contact area is wide, so that the bonding strength is sufficiently higher than that of the conventional case.

In addition, since the main magnetic pole part 27 has a wide surface, it is less likely to cause damage to the medium, unlike the conventional case in which the joint is located near the center of the medium sliding surface. and L-shaped nonmagnetic material 23a.

23b to form the composite block 24, only the side end surfaces of the soft magnetic block 20 need to be processed, so either the upper or lower surface can be used as a reliable reference surface, and the composite There is no taper in the upper and lower surfaces of the body block 24, and the upper and lower surfaces can be raised to highly accurate parallel surfaces.

Thereby, the main pole film at the tip of the head can be correctly positioned at the apex during polishing of the spherical tip.

[Effects of the Invention] As explained above, according to the present invention, the following various excellent effects can be achieved.

(i) Since the structure has a non-magnetic reinforcing material filled on both sides of the excitation magnetic core, this non-magnetic reinforcing material serves as a reinforcement for the root of the excitation magnetic core. Mechanical strength is ensured.

(iv) Since the main magnetic pole part is wide and the adhesive joint is not located near the center of the medium sliding surface, the medium sliding characteristics are improved.

(vi) Since the soft magnetic blocks constituting the composite block are integral, one surface can be used as a reliable reference surface during machining, enabling highly accurate machining.

[Brief explanation of drawings]

Figure 1 shows one embodiment of the manufacturing method of the present invention! ! Perspective view of the perpendicular magnetic head left behind, tA2, Fig. 3, Fig. 4,
Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, fjS10
Figure 11 shows a method of manufacturing an embodiment of the present invention, and shows the perpendicular magnetic head shown in Figure 1. llill fabrication, fjS
FIGS. 12(a) to 12(j) are process diagrams illustrating a conventional method for manufacturing a perpendicular magnetic head.

Claims (1)

[Scope of Claims] A step of forming two rows of filling grooves in a rectangular parallelepiped soft magnetic block and filling the filling grooves with a non-magnetic reinforcing material; A fitting groove with a depth reaching near the center from one end in the horizontal direction is formed, an L-shaped non-magnetic material is fitted and glued into this fitting groove, and then an L-shaped non-magnetic material is fitted and glued into the fitting groove, and then from the other end to the same depth near the center. The process of forming a composite block by forming a fitting groove with the desired length and fitting and bonding an L-shaped non-magnetic material into the fitting groove; A step of forming a thin plate-shaped main magnetic pole part integrally sandwiching a magnetic pole film by double-sided polishing, and joining this thin plate-shaped main pole part to the composite block, after joining the thin plate-shaped main pole part, or after joining the thin plate-shaped main pole part, or A step of forming two rows of winding space grooves along the length direction of the filling groove from the surface opposite to the filling groove in the composite block before the filling groove to form an excitation magnetic core portion and a winding space. , a step of polishing and finishing the upper surface of the thin plate-like main magnetic pole part joined to the composite block; after the polishing finish, inserting the alignedly wound coil into the excitation magnetic core part, and then joining a soft magnetic back core A method of manufacturing a perpendicular magnetic head, comprising the steps of: