JPS62234209A - Production of vertical magnetic head - Google Patents

Abstract

PURPOSE:To improve the sensitivity of a magnetic head by joining a thin plate-shaped main magnetic pole part and a soft magnetic thin piece body into a T shape by adhesion to join them closely and eliminating the spacing between the main magnetic pole part and an exciting magnetic core part. CONSTITUTION:The root of a center part 3a and roots of both side parts 3b of an E-shaped soft magnetic thin piece body 3 of a vertical magnetic head are jointed by nonmagnetic reinforcing materials 2, and a main magnetic pole film 8 is held between both end faces of a thin plate-shaped nonmagnetic material 7 as one body to form a thin plate-shaped main magnetic pole part 9. This thin piece body 3 is used as the exciting magnetic core part and is joined with a magnetic pole part 9 into a T shape so that the magnetic pole film of the magnetic pole part 9 is placed in the center of the center part 3a, thereby forming a T type composite body 20. A transverse groove to which the thin piece body 3 should be fitted is formed on the upper face of a rectangular parallelepiped-shaped soft magnetic block 21, and a hole 21a for winding space is formed in the center part. The magnetic pole part 9 and the thin piece body 3 are closely joined with each other into a T shape to eliminate the spacing between the magnetic pole part and the center part 3a to be the exciting magnetic core part, and the sensitivity of the magnetic head is improved.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention employs a perpendicular magnetic recording method in which magnetic recording is performed by magnetizing in the thickness direction of the medium perpendicular to the surface of the recording medium having a two-layer film structure. Magnetic recording of floppy disk devices, etc.
r! The present invention relates to a method of manufacturing a main pole-excited perpendicular magnetic head used in No. 1, and particularly relates to a method of manufacturing a main pole-excited perpendicular magnetic head using a coil post-insertion method.

[Prior Art] FIGS. 9 to 17 show a conventional method of manufacturing the above-mentioned perpendicular magnetic head (see Japanese Patent Application No. Sho-297323).

this! 1! The manufacturing method is a coil post-insertion manufacturing method in which the head tip is formed first, and the coil is wound in an aligned manner using a 4ffl rock, etc., and then inserted after the head tip is polished, etc. 1), Honzu, Shall we form two parallel grooves 1a on the single force surface of the rectangular soft magnetic block 1? tS
10), a non-magnetic reinforcing material 2 such as glass is placed in this filling groove 1a.
(Fig. 11), and then fill the two filling grooves 1a.
The two separating grooves 1b are machined from the opposite side so that only the filled reinforcing glass (non-magnetic reinforcing material) 2 remains (Fig. 12), and then the fir is sliced thinly as shown by the arrow. In addition, in order to obtain 8 lines, the filling groove 1
The separation groove 1b may be made wider than a, thereby forming an E-shape (a shape similar to a horizontal E is called an E-shape), and its central portion 3a and both side portions 3b are filled. A soft magnetic thin piece body 3 is formed by integrally bonding the lower part of the bonded reinforcing glass 2 (Fig. tjIJ13).

Apart from the above, as shown in FIG.
A concave reinforcing block 5 is fitted and adhered to the winding space groove 4b of the soft magnetic block 4 in which the 8-wire intermediate groove 4b is formed, and a thin groove 4c is formed at the bottom of the bank core groove 4a.
The E-shaped soft magnetic thin piece body 3 is fitted and bonded into this thin groove 4c, and then the first
The auxiliary core part 6 as shown in Fig. PIs15 is formed by lapping the lower surface in Fig. 4 t, and on the other hand, the main magnetic pole of Amol 77 soft magnetic yii is placed between the main magnetic pole substrates 7, made of a non-magnetic material such as a positive electrode. A thin plate-like main magnetic pole part 9 on which IA8 is formed is formed (Fig. 16), and this thin plate-like main magnetic pole part 9 is
As shown in the figure, on the wrapped upper surface of the auxiliary core n6,
The main magnetic pole film 8 is adhesively bonded to the center of the E-shaped soft magnetic thin piece 3, that is, the center of the exciting magnetic core 3a, and then the upper surface of the main magnetic pole 9, which will become the medium sliding surface, is wrapped. Then, the coil 10t which has been mechanically wound in advance is inserted into the excitation magnetic core 3a of the soft magnetic thin piece body 3, and the back core 11 of the soft magnetic material is fitted and glued to the '144a for the Bafukko 7. Thus, the perpendicular magnetic head shown in Fig. m9 is completed.

[Problems to be Solved by the Invention] In the perpendicular magnetic head manufactured by the conventional 51 manufacturing method described above, it is possible to insert coils wound in alignment by mechanical winding.
Inductance can be reduced, and ease of assembly is achieved.
It has advantages such as excellent workability, and in addition, the main pole i9 is wide and the adhesive joint is not near the center of the media sliding surface, making it easy to slide the media! 11] It has advantages such as good characteristics, but between the joint surfaces of the thin main pole part 9 and the auxiliary core part 6, more precisely, the excitation of the main pole 115!8 and the soft magnetic thin piece body 3 Spacing (gap) between the top surface of the magnetic core 3a
There is a drawback that this occurs. In other words, because the upper surface of the auxiliary core section 6 is made of a composite of ferrite and glass with different hardnesses, and because its area is large, processing distortion occurs in the central section (excitation magnetic core section) during wrapping. It has a sunken shape, and tends to have excessive spacing. When this spacing occurs, the magnetic efficiency decreases, which is an obstacle to increasing the sensitivity of the head.

The present invention solves the above-mentioned conventional problems, and provides a direct magnetic head that eliminates spacing between the main pole film and the excitation magnetic core and achieves high sensitivity! 11 The purpose is to obtain the will law.

Means for Solving Problem E] The present invention which solves the above problem consists of a soft magnetic thin piece that is E-shaped and whose base portions between the center and both sides are joined by a non-magnetic reinforcing material. a step of forming a thin main magnetic pole part by sandwiching and integrating a main magnetic pole film between the end faces of a pair of thin nonmagnetic materials; forming a T-shaped composite by adhesively bonding to the thin plate-shaped main magnetic pole part in a T-shape so that the main magnetic pole film of the curved thin plate-shaped main magnetic pole part is located in the center of the central part; forming a narrow groove on the upper surface into which the soft magnetic thin piece can fit, and forming a hole for a winding space in the center of the upper surface; on the upper surface of the soft magnetic block;
A step of adhesively joining the thin plate-shaped main pole part of the T-shaped composite so that the soft magnetic thin piece body fits into the #II 1741: Next, a recess for the back core is formed on the bottom side of the soft magnetic block, and the thin plate The surface of the shaped main magnetic pole part is polished into a spherical shape, etc., the aligned and wound fill is inserted into the excitation magnetic core part of the soft magnetic thin piece, and then the back core made of soft magnetic material is fitted into the recessed part for the back core. A method of manufacturing a perpendicular magnetic head includes the steps of adhesively bonding the head.

[Function] In the above manufacturing method, since the soft magnetic thin piece is individually bonded to the thin plate-like main pole part in a T-shape, the bonding area of ml is small, and the problem of depression due to processing strain during polishing does not occur. First, there is almost no spacing between the main pole film of the thin main pole portion and the center portion of the soft magnetic thin piece, that is, the excitation magnetic core portion.

[Example] An example of the present invention will be described below with reference to FIGS. 1 to 8. Note that the f3 portion which is common to the conventional one is given the same reference numeral to simplify the explanation.

first,? As shown in FIG. 1S2, a soft magnetic thin piece body 3 is formed which has a figure 8 shape and whose base portions between the center gls 3 a and both side portions 3 b are joined by a nonmagnetic reinforcing material 2 . The soft magnetic thin piece body 3 itself is similar to the conventional soft magnetic thin piece body, and is formed, for example, by the steps shown in FIGS. 10 to 13 as in the conventional case.

Next, as shown in FIG. 3, a pair of thin plate-shaped nonmagnetic materials 7,
A thin plate-shaped main pole portion 9 is formed by sandwiching and integrating a main pole film 8 between both end faces of the main pole portion 7 . This thin plate main magnetic pole portion 9 is also similar to the conventional thin plate main magnetic pole portion.

Next, the soft magnetic thin piece body 3 is adhesively bonded to the thin plate-like main pole g9 in a T-shape so that the main pole film 8 of the thin plate-like main magnet if9 is located in the center of the central part 3a which is to become the excitation magnetic core part. Then, the T-shaped composite body 20 is formed.Before joining, the surface of the thin main magnetic pole portion 9 on the side to be joined is wrapped.

Next, as shown in FIG. mr to which the thin piece body 3 can fit:! form t21b. Note that either the 8-wire space hole 21a or the narrow groove 21b may be formed first.

Next is the soft magnetic pro? After coating the surface of the #lI groove 21bll of the groove 21, as shown in Fig. 7,
The thin main magnetic pole part 9 of the T-shaped composite body 20 is welded together so that the soft magnetic thin piece body 3 fits into the narrow groove 21b, and the bottom side of the soft magnetic block 21 (that is, the side opposite to the main magnetic pole part 9 in,
In FIG. 7, a back core groove 21c as shown in FIG. 8 is formed on the upper surface gA).

This back core groove 21c is formed by grooving on both sides of the soft magnetic thin piece body 3, leaving the width as shown by the two-dot chain line in FIG. 7, so that a part of the soft magnetic thin piece body 3 protrudes. If shaped, it can be used as a passage for drawing out the lead wire of the coil 22, which will be described later.

Note that the depth b2 of the narrow groove 211+ is greater than the height I+ of the soft magnetic thin piece body 3.

Next, the surface of the thin plate-like main pole part 9 is polished into a spherical shape by lapping or the like, and then the coil 22 wound in an orderly manner with winding #i is placed in the center part of the soft magnetic thin piece body 3, that is, in the excitation magnetic core part 3a. After that, the back core 23 made of a soft magnetic material is fitted into the back core groove 21c and adhesively bonded to the back core groove 21c. Through the above steps, a perpendicular magnetic head as shown in FIG. 1 is completed.

In addition, in the embodiment, the penetrating winding space hole 21a was formed, but when it was opened from the same side as the narrow groove 21b and the back core groove 21c was grooved, this back core groove 2
It is also possible to form a hole of 7t that does not penetrate so that it opens at the bottom of 1c.

In addition, when forming the winding space hole 21a that penetrates as in the embodiment, this winding space hole 21a can also be used as a back core space (that is, a back core recess). In this case, the back core groove 21c as shown is not necessary, and a cylindrical back core that matches the winding space hole 21a is inserted and adhesively bonded.

In the above manufacturing process, the soft magnetic thin piece 3 is individually adhesively bonded to the thin main pole part 9 in a T-shape, so that its Jf
A landing area is small. Therefore, the problem of depression due to processing strain during lapping does not occur, and the joint is made between flat joint surfaces, and the central part of the main pole film 8 of the thin main pole 81S9 and the soft magnetic thin piece body 3, that is, the excitation magnetic core There is almost no spacing between the magnetic head and the portion 3a, and a highly sensitive perpendicular magnetic head can be obtained.

Furthermore, since the main magnetic pole part has a single plate shape with a large area, the adhesive bonding part does not come near the center of the medium sliding surface, and the medium sliding characteristics are excellent.

Furthermore, since the soft magnetic block 21 is an integral piece, one surface of the soft magnetic block 7 can be used as a reliable reference surface during machining, and highly accurate machining is possible.

Furthermore, since the coil is put in after the coil is installed and a winding machine can be used for the fill, it is superior in assembly and workability, and the number of man-hours can be reduced.

Furthermore, since the excitation magnetic core is surrounded by a soft magnetic material, a magnetic shielding effect can be considered.

[Effect of the Invention 1] As explained above, according to the present invention, the thin main pole portion and the soft magnetic thin piece are first adhesively bonded in a T-shape, so the bonding area at that time is narrow. Therefore, there is no problem of spacing due to depressions caused by processing distortion during polishing as in the conventional method, and the joints are in close contact with each other. Therefore, almost no spacing occurs between the main magnetic Fi film of the thin main magnetic pole portion and the central portion of the soft magnetic thin piece, that is, the excitation magnetic core portion, and the sensitivity of the perpendicular magnetic head is improved.

[Brief explanation of drawings]

Figure 1 is a perspective view showing an embodiment of the perpendicular magnetic head according to the present invention. @Figure 2, Figure 4, Figure 5, Figure 6, Figure 7,
PIS8 diagram shows the perpendicular magnetic head in Figure 1! 9 to 17 show a conventional example, and FIG. 9 is a perspective view of a perpendicular magnetic head according to the conventional method, and FIG.
Figure, Figure 11, Figure 12, Figure 13, Figure 14, ttS
Figures 15, 16, and 17 are manufacturing process diagrams.

Claims (1)

[Claims] E-shaped, its central portion (3a) and both side portions (3b)
A step of forming a soft magnetic thin piece body (3) whose base part between the two is joined by a non-magnetic reinforcing material (2), and a main magnetic pole film (7 ), the soft magnetic thin piece body (3) is placed in the center of the central part (3a) which is to become the excitation magnetic core part, and the thin plate-like main pole part (9) is formed by sandwiching and integrating A step of adhesively bonding the main magnetic pole part (9) in a T-shape to the thin main magnetic pole part (9) so that the main magnetic pole film (8) of the part (9) is positioned to form a T-shaped composite (20), a rectangular parallelepiped-shaped soft magnetic block. (21) forming a narrow groove (21b) into which the soft magnetic thin piece body (3) can fit in the upper surface, and forming a winding space hole (21a) in the center of the upper surface; A soft magnetic thin piece (
3) adhesively bonding the thin main magnetic pole part (9) of the T-shaped composite (20) so that it fits into the narrow groove (21b); A back core recess (21c) is formed, and a thin main magnetic pole part (9) is formed.
The surface of the coil (22) is polished into a spherical shape, etc., and the coil (22) wound in an aligned manner is attached to the excitation magnetic core (3a) of the soft magnetic thin piece (3).
A method for manufacturing a perpendicular magnetic head, comprising the steps of: inserting a back core (23) made of a soft magnetic material into the back core recess (21c) and adhesively bonding the back core (23) to the back core recess (21c).