JPS6141043B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a multi-element magnetic head, and more particularly to an improvement in a method for manufacturing a multi-element magnetic head in which a large number of magnetic tracks are formed in parallel on a magnetic recording medium, for example.

Conventionally, multi-element magnetic heads have been used to simultaneously and parallelly form a large number of recording tracks on a magnetic recording medium such as a magnetic tape.

FIG. 1 is an illustrative view showing the structure of a conventional multi-element magnetic head, which is the background of this invention. FIG. 1 a shows a plan view, FIG. 1 b shows a side view, and FIG. 1 c shows a front view. . Left and right (in the figure) magnetic path sections 10 and 2
0 indicates the magnetic bodies 11a to 1 that constitute the magnetic path, respectively.
1d and 21a to 21d and these magnetic bodies 11
A nonmagnetic spacer 1 having coils 12a to 12d and 22a to 22d wound around a to 11d and 21a to 21d, and relief portions corresponding to the winding thicknesses of the coils 12a to 12d and 22a to 22d.
3a to 13e and 23a to 23e, which are integrated by, for example, adhesion.
Left and right magnetic path sections 10 and 20 integrated in this way
After the abutting surfaces 14 and 24 of the two are polished, the non-magnetic material gap 30 is sandwiched and the two are butt-bonded. In this way, a multi-element magnetic head is manufactured.

In manufacturing such a conventional multi-element magnetic head, each magnetic body 11a constituting the magnetic head is
11d, 21a to 21d and non-magnetic spacers 13a to 13e, 23a to 23e, or positional deviations during butt bonding of the left and right magnetic path sections 10 and 20, the left magnetic head 1
1a, right magnetic head 11a, and right magnetic head 2
The positions (of the magnetic track portions) of 1a, 11b and 21b, . Such positional misalignment and track width mismatch between the left and right magnetic heads cause various problems during recording and reproduction, and great care must be taken in the manufacturing process. Therefore, the productivity is poor, and it is not easy to improve the quality.

Furthermore, in conventional multi-element magnetic heads, it has been customary to fill spacers made of non-magnetic material with shield members made of magnetic material. Therefore, there was a drawback that complicated operations were required during manufacturing.

Therefore, the main object of the present invention is to provide a method for manufacturing a multi-element magnetic head that can eliminate the above-mentioned drawbacks. A spacer member is formed between the magnetic medium facing elements, and a rear magnetic path section including the coils of each element is separately formed as an integral structure on the left and right sides. However, it is an object of the present invention to provide a method for manufacturing a multi-element magnetic head in which the magnetic medium facing surface portion and the rear magnetic path portion are integrated by bonding.

Examples of the manufacturing method of the present invention will be described below with reference to the drawings.

FIG. 2 is an embodiment showing step-by-step the manufacturing process of the magnetic medium facing surface portion according to the present invention.
First, as shown in FIG. 2a, a magnetic block 110, which is made of a magnetic material such as ferrite, and is to become the left magnetic path section, and a magnetic block 120, which is similarly made of a magnetic material, and which is to be the right magnetic path part, are separated. be prepared. The magnetic blocks 110 and 120 have grooves 115 and 125 on their opposing surfaces to separate the left and right magnetic path sections, respectively, and form a gap section 130 made of a non-magnetic material such as chrome or glass. For example, glass is welded so as to abut against each other, thereby obtaining an integral bonded magnetic block 100 as shown in FIG. 2a. At this time, the grooves 115 and 125 may be filled with the glass material used for the welding.

Next, the integrated bonded magnetic block 100
are processed simultaneously on the left and right sides into a comb-teeth shape with the same pitch and width as shown in FIG. . Here, a plurality of comb teeth portions 116a to 116e (forming a magnetic track) formed on the left magnetic block 110 and a plurality of comb teeth portions 126a to 126e (forming a magnetic track) formed on the right magnetic block 120 are shown. 117a-117d and 127a-127d in the left and right magnetic blocks respectively.
are formed simultaneously. That is, the left and right joined magnetic blocks 100 are processed into a comb-teeth shape at the same time. At this time, the lower part of the integrated bonded magnetic block 100 is connected to the comb teeth portions 116a to 116.
e, 126a to 126e are left as the support part 101 which is a non-cutting part. Its support part 1
01, there is no misalignment or misalignment between the left magnetic track and the right magnetic track.

The comb tooth portions 116a to 116e, 126a to 1
Each of the elements 26e forms a magnetic medium facing element.

Next, the grooves 117a to 117d, 127a to 1 formed in the integrated bonded magnetic block 100 are
27d, 115 and 125, spacer members 105a to 10 made of a non-magnetic material such as low melting point glass (this may also be resin) having a coefficient of thermal expansion approximately equal to that of the magnetic material constituting this bonded magnetic block 100.
5d and 102 to fix the space between each magnetic medium facing element (between each comb tooth portion) to obtain a bonded magnetic block 100 as shown in FIG. 2c. Then, as shown by the dashed line in FIG. 2c, the block with the non-magnetic gear part 130 is cut into upper and lower blocks at the cutting part 103 such that no supporting part 101 remains, and the upper part of the block is cut into upper and lower blocks. A magnetic medium facing surface portion 104 is obtained to face the magnetic medium. The lower end surface, that is, the cut surface of the magnetic medium facing surface portion 104 is subjected to, for example, a polishing treatment for post-processing.

FIG. 3 is an embodiment showing step-by-step the manufacturing process of a hollow magnetic path section according to the present invention. first,
As shown in FIG. 3a, it is made of a magnetic material, and includes a magnetic block 210 on the left side and a magnetic block 220 on the right side.
A concave magnetic block 200 in which a groove 202 is formed to separate the two is prepared. At this time, the upper end surface is subjected to, for example, a polishing treatment for a post-process.

Next, this concave magnetic block 200 is cut into the left and right blocks 210 and 220 at the same time with the same pitch and same width as in FIG. Process it into a comb-like shape as shown. At this time, the comb teeth portion is formed deeper than the groove 202. Here, a plurality of comb teeth portions 2 formed on the left magnetic block 210
16a to 216e (forming the rear magnetic path portion of the magnetic track) and a plurality of comb teeth portions 226a to 226e (forming the rear magnetic path portion of the magnetic track) formed on the right magnetic block 220. Grooves 217a-217d and 227a-227d are correspondingly formed simultaneously in the left and right magnetic blocks, respectively. These comb teeth portions 216a to 216e, 226a, 226
Usually, the width of the magnetic track (comb tooth portion 11
6a to 116e, 126a to 126e), but may be changed somewhat depending on the thickness (inner diameter) or magnetic resistance of the coil to be installed in a subsequent process. At this time, the lower part of the magnetic block 200 has the comb teeth portions 216a to 216e, 226a to
The support portion 201 is left as an uncut portion of 226e. In this way, the magnetic path on the left side and the magnetic path on the right side are processed at the same time and at the same pitch as the magnetic track, and since the lower part is fixed by the support part 201, there is no misalignment or misalignment between them. It doesn't happen at all.

Next, the grooves 217a to 217d, 227a to 22 formed in the integral concave magnetic block 200 are
7d, leaving a length for installing the next coil,
A spacer member 205 made of a non-magnetic material such as low-melting glass (this may also be resin) having a coefficient of thermal expansion approximately equal to that of the magnetic material constituting the concave magnetic block 200.
A to 205d are filled to fix the spaces between the rear magnetic path sections (between the comb tooth sections) to obtain a concave magnetic block 200 as shown in FIG. 3C. As shown by the dashed line in FIG.
The block is cut into upper and lower blocks at the cutting part 203 where no 01 remains, and the upper part thereof is obtained as the rear magnetic path part 204 which is to constitute the magnetic path of each magnetic track of the magnetic medium facing surface part 104. As described above, the upper end surface of this rear magnetic path section 204 is polished, for example, for post-processing.

FIG. 4 is a perspective view showing a multi-element magnetic head obtained by an embodiment of the manufacturing method of the present invention. First, each comb tooth portion 21 of the rear magnetic path portion 204
Coils 218a to 218e, 228 to be attached to or wound around 6a to 216e, 226a to 226e
It is assumed that a to 228e are made in advance in separate steps. And these coils 218a to 218
The inner diameter or winding thickness of the comb teeth 216a to 216e, 226a to 228e, 228a to 228e are
It is determined appropriately according to the outer diameter or pitch of 6e.

Then, the rear magnetic path section 204 shown in FIG.
Each comb tooth portion 216a to 216e, 226a to 22
6e, coils 218a to 218e and 228a to 228e prepared in advance as described above, respectively.
Attach. Thereafter, the lower end surface of the magnetic medium facing surface section 104 shown in FIG. In this way, the manufacturing of the multi-element magnetic head is completed.

In addition, even if the organic adhesive does not have magnetism,
Since the adhesive layer is only about a few microns thick, it does not interfere with the configuration of the magnetic path.

FIG. 5 is a perspective view showing a multi-element magnetic head manufactured according to another embodiment of the present invention. This embodiment is substantially similar to that of FIG. 4, except as follows. That is, as a spacer member between each track of the magnetic medium facing surface portion 104, low melting point glasses 105a to 105d are filled in the embodiment of FIG. 4, but in the embodiment of FIG. Ferrite - Sandwich-shaped shield block 105a' of non-magnetic ferrite
105d' was inserted as a non-magnetic spacer member to secure the comb tooth portions. The shield blocks 105a' to 105d' are also made of a material having the same coefficient of thermal expansion as the magnetic material forming the magnetic track. By using magnetic ferrite sandwiched between non-magnetic ferrite in this way, the lines of magnetic force from each track or magnetic head are first blocked by the non-magnetic ferrite, and then further blocked by the magnetic ferrite. blocked,
Further, since the tracks are shielded by magnetic ferrite, interference between the tracks is reduced.

In addition, each magnetic path portion (comb tooth portion) of the rear magnetic path portion 204
The coils 218a, 228b, . . . are installed alternately on the left and right.
Attach (wind) 228d. By winding the coils 218a, 228b, . . . , etc. alternately on the left and right in a staggered manner, the winding thickness of one coil is can be made relatively large, and the workability when installing the coil is greatly improved (compared to something that is installed on both the left and right sides).

As described above, according to the method of manufacturing a multi-element magnetic head of the present invention, both the magnetic medium facing surface portion and the rear magnetic path portion are formed by simultaneously processing each of the magnetic blocks of the left and right integrated magnetic blocks. A spacer member is filled between each comb tooth portion after processing, and a non-cutting portion of each comb tooth portion is formed until each comb tooth portion and the spacer member are fixed together. Since the supporting parts 101 and 201 are not removed, the track position does not shift or misalignment occurs when the left and right tracks are butted, compared to the conventional structure in which the tracks are simply formed in a laminated manner. Furthermore, since the deviation of the track position is non-integrative and depends only on the accuracy of the processing machine, its accuracy is very high. Furthermore, the left and right magnetic path portions of the magnetic medium facing surface portion and the rear magnetic path portion are integrated (held) together by glass welding, etc., and the joining surfaces of the magnetic medium facing surface portion and the rear magnetic path portion are bonded. Therefore, it is possible to manufacture a highly reliable multi-element magnetic head with almost no change over time.
Furthermore, since the joint surfaces are bonded in this way, the organic adhesive easily dissolves in organic solvents, so if there is a defect in the opposing surface, rear magnetic path, or coil, the defective product can be replaced. It is easy to do.

[Brief explanation of the drawing]

FIG. 1 is an illustrative view showing a conventional multi-element magnetic head, which is the background of this invention. FIG. 1a shows a plan view, FIG. 1b shows a side view, and FIG. 1c shows a front view. FIG. 2 is a perspective view showing step-by-step the manufacturing process of a magnetic medium facing surface portion according to an embodiment of the present invention. FIG. 3 is a perspective view showing step-by-step the manufacturing process of the rear magnetic path section according to an embodiment of the present invention. FIG. 4 is a perspective view of a multi-element magnetic head according to one embodiment of the present invention. FIG. 5 is a perspective view of a multi-element magnetic head according to another embodiment of the invention. In the figure, 100 is a junction magnetic block, 10
1, 201 is a non-cutting part, 104 is a magnetic medium facing surface part, 110, 120, 210, 220 is a magnetic block, 105a to 105d, 205a to 205d
are spacer members, 116a to 116e, 126a
126e is a magnetic medium facing element, 180 is a gap portion, 200 is a concave magnetic block, 202 is a groove,
204 is a rear magnetic path section, 216a to 216e, 22
6a to 226e are rear magnetic paths, 218a to 218
e, 228a to 228e are coils. In the figure,
The same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] 1. A step of preparing a joined magnetic block which is integrated by joining two magnetic blocks forming left and right first magnetic path parts with a gap part made of a non-magnetic material in between, and which has the gap part on one end face; The two magnetic blocks are simultaneously machined into a comb-like shape with the same dimensions so as to leave a first uncut portion on the surface opposite to the surface where the magnetic media is located, and to cross the gap portion so as to face a plurality of magnetic media. In the step of forming the element, a first groove made of a non-magnetic material is placed between the comb-like processed parts.
a step of filling a spacer member to fix the space between the magnetic medium facing elements, and removing the first uncut portion from the bonded magnetic block in which the space between the magnetic medium facing elements is fixed to form the left and right first magnetic paths. forming a magnetic medium facing surface portion comprising the plurality of magnetic medium facing elements having two protrusions forming left and right second magnetic path portions corresponding to the left and right first magnetic path portions of the magnetic medium facing element; preparing a concave magnetic block having a second protrusion deeper than the groove between the two protrusions and opposite to the grooved surface;
Said 2
forming a plurality of rear magnetic path sections by processing two protrusions simultaneously and with the same dimensions into a comb-teeth shape corresponding to each of the magnetic medium facing elements, a coil winding length remaining in each of the rear magnetic path sections; a step of filling the groove between the comb-like processed parts with a second spacer member made of a non-magnetic material to fix the space between the respective rear magnetic path parts; the step of removing the second non-cutting portion from the block to create the plurality of rear magnetic path portions having the left and right second magnetic paths; the groove between the comb-like processed portions is not filled with a spacer member; a step of winding a coil around at least one of the left and right second magnetic path sections, a surface of the magnetic medium facing surface section opposite to the surface where the gap section is located, and the groove of the rear magnetic path section around which the coil is wound. A method for manufacturing a multi-element magnetic head, including the step of bonding a magnetic head to a certain surface.