JPS6158885B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a narrow track multi-element magnetic head for forming a plurality of narrow magnetization tracks in a magnetic medium.

The structure of this type of magnetic head and its manufacturing method are described in an earlier application filed by the same applicant (Japanese Patent Application No.
No. 75149 (Japanese Unexamined Patent Publication No. 53-1010)).

The structure of the narrow track multi-element magnetic head proposed in that earlier application is shown in FIG. 1, and its manufacturing method is shown in FIGS. 2a, b, c and 3a, b, c.
are shown respectively. In this FIG. 1, the narrow track multi-element magnetic head includes an actuating gap 2, glass-filled apexes 3a, 3b, front guards 4a, 4b, and a plurality of front magnetic paths of track width T ₁ . A front multi-element magnetic headblock 1 having portions 5a to 5c and glass filling layers 6a to 6d, a center groove 8, rear guard portions 9a and 9b, and a rear magnetic path portion 10a to 10a having coils 12a to 12c wound therein. 1
0c and a rear multi-element magnetic headblock 7 having glass filling layers 11a to 11d, and these and rear guard parts 4a, 4b and 9a,
9b and the same magnetic path portions 5a to 5c and 10a to
10c are constructed by joining and fixing them to each other.

Therefore, the front multi-element magnetic headblock 1
In the manufacturing process, first, as shown in FIG.
4a and 14b are formed into the working gap 2 through a spacer, and then glass welded to form a block 15. Then, as shown in FIG. 2b, this block 15 is cut from above with the same pitch and width. By machining it into a comb-teeth shape, the front guard parts 4a, 4b at both ends and the plurality of front magnetic path parts 5a to 5c having a track width _T1 are formed into the same comb-teeth machined groove 17a.
~17d, the common magnetic path section 18 is left at the base and separated to form the block 16, and as shown in FIG. The comb-teeth processing grooves 17a to 17d are filled with glass to form the glass filling layers 6a to 6d to form a block 19, and then this block 19 is cut and polished from the cutting line _A1 to _A2 . , the front multi-element magnetic headblock 1 is obtained, and the rear multi-element magnetic headblock 7 is manufactured by first polishing bonding surfaces 20a and 20b on the upper surface of the magnetic member, as shown in FIG. 3a. The center groove 8 is machined so as to be separated to form a block 21, and then, as shown in FIG. The rear guard portions 9a, 9b at both ends and the rear magnetic path portions 10a to 10c corresponding to the track width _T1 are connected to the same comb-shaped groove 22a.
22d, the common magnetic path portion 23 is left at the base and separated to form a block 24, and as shown in FIG. 11a to 11d to form a block 26, this block 26 is connected to the common magnetic path section ₂ from the cutting line _B1 -B2.
The rear multi-element magnetic headblock 7 is obtained by cutting the magnetic head block 7 so as to remove 3.

Both headblocks 1 and 7 obtained in this way have a rear magnetic path section 1 of headblock 7.
Coils 12 pre-wound around 0a to 10c
After inserting each of the head blocks 1 and 12c, the head blocks 1 and 7 are joined and fixed as described above, and the second side of the working gap, which is the sliding surface side of the magnetic medium, is formed to achieve the desired narrow width. Thus, a track multi-element magnetic head can be obtained.

In the method for manufacturing a narrow track multi-element magnetic head proposed in this prior application, when the comb tooth grooves 17a to 17d are processed during the manufacturing process, the magnetic path portions 5a to 5 left in the block 16 are
The width of c, that is, the track width T ₁ is close to the limit,
If the same width T ₁ is made narrower than this, the same groove 17
In the process of processing a to 17d to a predetermined depth, there was a risk that the magnetic path portions 5a to 5c would break or be damaged. Therefore, as long as the manufacturing method of the prior application is adopted, the track width _T1 cannot be made narrower than this, and it is impossible to obtain a narrower magnetization narrow track on the magnetic medium. However, there is a need for a method of manufacturing a multi-element magnetic head that can form an even narrower track.

Therefore, an object of the present invention is to propose a method for manufacturing a narrow track multi-element magnetic head that can meet the above-mentioned needs. First, a magnetic path portion having a track width T ₂ narrower than the track width T ₁ is formed by a first machined groove that is shallow enough not to break or damage the resulting magnetic path portion, and then a second machined groove is formed. was processed to a predetermined depth in the same manner as before to form the remaining magnetic path portion following the magnetic path portion with width T ₂ , that is, the magnetic path portion with width T ₁ here. As a result, the track width on the working gear surface side, which is the sliding surface side of the magnetic medium, is narrower than in the case of the above application.
T ₂ (of course, T ₂ < T ₁ ).

Embodiments of the present invention will be described in detail below with reference to FIGS. 4 to 6 in addition to FIGS. 2 and 3.

4a and 4b show a method for manufacturing a narrow track multi-element magnetic head according to an embodiment of the present invention, and FIG.
The figures each show a narrow track multi-element magnetic head obtained by this manufacturing method.

FIG. 4a shows a manufacturing process corresponding to FIG. 2b, and in contrast to the block 15 obtained in FIG. , track width T ₂
(as mentioned above, T ₂ < T ₁ ) magnetic path portion 2
8a to 28c are formed shallowly, and then the second comb-teeth processing grooves 17a to 17d are formed as in the conventional method.
Magnetic path portions 5a to 5c with a width T ₁ following the magnetic path portions 28a to 28c are formed to a predetermined depth, and are separated, leaving the common magnetic path portion 18 together with the front guard portions 4a and 4b at both ends. and obtain block 29. FIG. 4b shows a manufacturing process corresponding to FIG. Grooves 27a to 27f, 17
After forming the block 30 by filling the insides of the blocks with glass to form the glass filled layers 6a to 6d, the block 30 is cut along the cutting line.
A front multi-element magnetic headblock 31 similar to the front multi-element magnetic headblock 1 is obtained by cutting and polishing from the _C1 - _C2 portion.

The front multi-element magnetic headblock 31 thus obtained is obtained by inserting the coils 12a to 12c into the rear magnetic path portions 10a to 10c of the rear multi-element magnetic headblock 7 obtained by the conventional process. They are then bonded and fixed at the top to construct the intended narrow track multi-element magnetic head shown in FIG.

In the narrow track multi-element magnetic head manufactured by the method according to the present invention, signal currents are applied to the coils 12a to 12c, respectively, in the same way as in the prior application, so that a signal current is applied to the magnetic medium through the operating gap 2. , a plurality of narrow magnetized tracks with a track width _T2 narrower than the conventional track width _T1 can be recorded and reproduced.

FIGS. 6a and 6b show another embodiment for manufacturing the rear multi-element magnetic head block 7. In this embodiment, the block is first machined with comb teeth from the surface facing the common base. Grooves corresponding to the grooves 22a to 22d as shown in FIG. 3b are formed, and glass filling layers 11a to 11d are formed in these groove portions to obtain the block 32 shown in FIG. 6a. Next, a center groove 8 and comb-teeth grooves 22a to 22d are machined in this block 32 from the joint surface side opposite to the common base, as shown in FIG. 3B. Finally, the rear guard parts 9a and 9b on both sides and the rear magnetic path parts 10a to 1
0c to obtain the rear multi-element magnetic headblock 33 as shown in _FIG. 6b _. This allows cutting to be omitted.

As described in detail above, according to the present invention, when forming a magnetic path section each including a plurality of working gap, shallow first comb-shaped grooves are first formed on both sides of the working gap. After separating the magnetic path portion with a track width T ₂ narrower than the proposed example, the magnetic path portion with a width T ₁ following this magnetic path portion is further cut into a second comb-shaped groove as specified. The track width, which was considered to be the final limit, can be made even narrower, and when manufacturing the same block, the same pitch and width are processed, and each magnet is Since the path sections are separated and formed independently, there is no misalignment of the working gap, and a narrow track multi-element magnetic head can be manufactured with high precision, while the final working gap as described above is track width on surface side
Since the T ₂ magnetic path portion is initially formed by the shallow first comb-tooth groove, the magnetic path portion that regulates the track width T ₂ when the second comb-tooth groove is formed. There is no risk of damaging both edges, and a more effective narrow track can be formed.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the structure of the narrow track multi-element magnetic head of the earlier application, FIGS. 2a, b, c and 3.
Figures a, b and c are perspective views showing the manufacturing process of the front and rear multi-element magnetic headblocks, and Figures 4a and b are Figures 2b and c according to an embodiment of the present invention.
FIG. 5 is a perspective view showing the manufacturing process of a front multi-element magnetic head block corresponding to the present invention; FIG. 3A and 3B are perspective views showing the manufacturing process of a rear multi-element magnetic headblock corresponding to FIGS. 3A, 3B and 3C according to another embodiment of the present invention. 1...Front multi-element magnetic headblock, 2...
Operating gap, 3a, 3b...apex, 4
a, 4b...front guard part, 5a-5c...front magnetic path part, 6a-6d...glass filling layer, 7...rear multi-element magnetic headblock, 8...center groove, 9a, 9b... Rear guard part, 10a-10
c...Rear magnetic path section, 11a-11d...Glass filling layer, 12a-12c...Coil, 15, 16,
19... Manufacturing process blocks, 17a to 17d...
...Comb tooth processing groove, 18...Common magnetic path section, 19,2
1, 24... Manufacturing process blocks, 22a-22
d... Comb tooth processing groove, 23... Common magnetic path section, 27a
~27f...First comb tooth processing groove, 28a~28c
...Front magnetic path portion, 29, 30... Block in the manufacturing process, 31... Front multi-element magnetic headblock, 32... Block in the manufacturing process, 33... Rear multi-element magnetic block, T ₁ , T ₂ ... Track width (T ₁ > T ₂ ).

Claims (1)

[Claims] 1 A pair of magnetic members are formed into a block by forming an operating gap and an apex portion therebetween, and a shallow groove is machined perpendicularly to the operating gap on the surface of the block on the operating gap side to increase the depth of the operating gap. A plurality of magnetic path portions are formed, including the above-mentioned operating gap that defines the track width and track pitch, which are narrow enough to be equal to or smaller than the magnetic path portion and do not break or damage the portion that becomes the magnetic path portion, and have a width narrower than the groove. By machining a deep groove, a common magnetic path portion is left at the base and a front guard portion is left on both sides of the extension direction of the plurality of actuation gap, so that the magnetic path portion including the actuation gap is connected to the common magnetic path portion. After forming a plurality of front magnetic path sections and filling each groove with glass to form a glass filling layer, the common magnetic path section is cut at the glass filling layer section to form a front multi-element magnetic field. A step of obtaining a head block, and forming grooves in another magnetic member, leaving a center groove corresponding to the apex portion and a common base corresponding to the deep groove, to form the front guards on both sides having the common base. After forming a rear guard part corresponding to the part and a plurality of rear magnetic path parts corresponding to the plurality of front magnetic path parts, and filling the groove with glass to form a glass filling layer, the glass filling layer is formed. cutting the common magnetic path portion of the common base at the layer portion to obtain a rear multi-element magnetic headblock; and inserting coils into the rear magnetic path portions of the front and rear multi-element magnetic headblocks; 1. A method for manufacturing a narrow track multi-element magnetic head, comprising the steps of bonding and fixing the front and rear guard portions and the front and rear magnetic path portions to each other so as to correspond to each other.