JPS6228911A - Manufacture of vertical magnetic recording head - Google Patents

Abstract

PURPOSE:To increase joint strength over the entire gap through the action of grooves with an adhesive and mass-produce a head of high quality, and to improve working accuracy by forming the grooves in the gap between nonmagnetic body blocks when both blocks are placed in an abutting state. CONSTITUTION:A thin film with high magnetic permeability and high saturated magnetic flux density is formed on one flank of a nonmagnetic body block 10 and removed in stripes to form a striped main magnetic pole thin film group 14, and then the groove 16 is formed in the flank part of the block 10. Then, the nonmagnetic body block where neither the group 14 nor the grooves 16 is formed is clamped meeting the block 10 and the adhesive is injected into the respective grooves 16. This injected adhesive moves down to the bottom and spreads laterally by crevasse effect to penetrate the the whole gap, adhering both blocks strongly. Consequently, the head of high quality is mass-produced and the grooves 16 are used as the standard of a cut line to facilitate working, thereby improving the working accuracy.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a method for manufacturing a perpendicular magnetic recording head, and in particular, the present invention relates to a method for manufacturing a perpendicular magnetic recording head. Or towards mass production.
This aims to improve workability and pressure accuracy in the 1000-knob head slicing process.

(Prior Art) Perpendicular magnetic recording is a recording method that magnetizes a magnetic recording medium such as a magnetic tape or a magnetic disk in the perpendicular direction, and a main pole excitation type as shown in FIG. 10 is known as a magnetic head for this purpose. ing.

In FIG. 10, a main magnetic pole 100 made of a thin M material with high magnetic permeability and high saturation magnetic flux density, such as a co-based amorphous soft magnetic film, is shown.
In the ferrite core (main core) 101J- around which the conductive coil 102 is wound, a pair of non-magnetic blocks (a pair of supports toe,
108). As shown in FIG. 10, a base layer 110a, a backing layer 110b and a recording layer 110 are provided.
The -1 end of the 1-mi magnetic pole 100 and the upper surfaces of the hyperlink-type or R-shaped supports 108, 108, respectively, come into contact with the two-layer magnetic recording medium 11.0 formed by stacking the magnetic poles 11.0 and 11.0. The lower surfaces of the supports 106 and 108 are adhesively fixed to the upper end surface of the core 104 and the upper end surfaces of a pair of return path sections (auxiliary cores) 112 and 114 extending from the core 104, respectively.

During recording, a current corresponding to a recording signal is passed through the coil 102, and the magnetic flux φ generated thereby exits from the main magnetic pole 100 in the perpendicular direction to the recording layer 1 of the opposing recording medium 110.
10c is magnetized in the perpendicular direction. The opposite is true during playback. In such recording/reproduction, the magnetic flux φ is loop L
It passes through a magnetic path (magnetic circuit) as shown by LL2. That is, the magnetic flux φ emitted from the main pole 100 passes through the recording layer 110c in the vertical direction, is bent in the horizontal direction by the underlayer 110b, and is then bent again in the vertical direction by the return path portions 112 and 114, and is directed to the core 104. return.

Conventionally, such magnetic heads have been manufactured by the following method.

First, as shown in FIG. 11, two parallel longitudinal grooves 1 are formed on one side of a square columnar ferrite block 120 using a slicing machine such as a dicer (die/puffer saw).
22 and 124 are formed, and this is used as the core original body 125.

On the other hand, as shown in FIG. 12, an amorphous soft magnetic film 128 having a thickness dl of, for example, about 0.3 μm is deposited on one side of a non-magnetic block 126 made of glass, ceramic, etc. in the shape of a rectangular prism by vapor deposition or sputtering. form,
Next, this amorphous soft magnetic thin film 128 is removed by etching in stripes in the vertical direction at regular intervals S of about 1000 μm, as shown in FIG. 13, to form a striped main pole film group 130 with a width W of about 100 μm, for example. do. Then the 14th
As shown in the figure, the non-magnetic block 126 and another similar non-magnetic block 132 are put together with the striped main magnetic pole film group 130 in between and fixed with an adhesive jig to form the striped main magnetic pole film group 130. Adhesive is poured into the gap g between the non-magnetic blocks 12E3, 132, and the adhesive penetrates deep into the gap between the non-magnetic blocks 126, 1 by the frebus effect.
32 are combined to form a main magnetic pole part shaped body 134.

Next, as shown in FIG.
The striped main pole film group 13 is sliced into a predetermined thickness d2 of about 0 μm and used as a head original plate 136.
0 is the main magnetic pole group 138.

Next, as shown in FIG. 16, a main magnetic pole original body 136 is placed on the upper surface of the core original body 125 manufactured as described above, and a main magnetic pole group 138 is erected on the core original body 123. This is fixed with adhesive to form the head original body 140. Next, each main magnetic pole 138 of the head prototype body 140 is sliced vertically to a predetermined thickness d3 using a slicing machine or the like to produce a sectioned head body 144 as shown in FIG. 17, and then as shown in FIG. As shown in FIG. 10, the upper surface of this section-shaped head body 144 is polished into an R-shaped or hyperpolished curved surface, and the main core 123 (104) is wrapped with the filler 102, thereby completing the perpendicular magnetic recording head shown in FIG. .

(Problems to be Solved by the Invention) In order to improve the mass productivity of the perpendicular magnetic recording head as described above, it is necessary to reduce the gap between the main pole film group 138 in the process of making the main pole part shape body 134 (FIG. 16). What is necessary is to reduce the interval S between.

However, if designed in this way, the striped main pole film group 13
A pair of non-magnetic blocks 128.
As the width p of the gap g between the gaps 132 and 132 becomes smaller, when the adhesive is poured there, the permeation speed becomes slow and the adhesive does not reach the entire gap g, resulting in poor adhesion, and as a result, the head strength decreases. There is a problem with the decline.

In addition, in the step of slicing the head prototype 140 into a predetermined width d3 around the main pole 138 (FIGS. 16 and 17), the position of the main pole 138 is detected using a microscope, and the midpoint between them (the gap g The thickness of the main magnetic pole 138 is still approximately 0.
．． Since it is extremely thin at about 3 .mu.m, it is difficult to detect it, and it is also difficult to divide the eye so that the main magnetic pole 138 is located in the center, which ultimately makes it difficult to achieve machining accuracy.

The present invention has been made in view of the above-mentioned problems of the prior art, and aims to improve head strength and mass productivity by improving the permeability of adhesive in the process of making a main pole original body, and to improve head strength and mass productivity. An object of the present invention is to provide a method for manufacturing a perpendicular magnetic recording head that improves workability and processing accuracy in a head slicing process.

(Means for Solving the Problems) The method of the present invention for achieving the above object is to form one or two parallel grooves in the longitudinal direction on one side of a ferrite block, use this as a core original body, and form two parallel grooves in the longitudinal direction. The protrusions sandwiched between the grooves of the book are used as the main core prototype, and a thin film with high magnetic permeability and high saturation magnetic flux density is formed on one side of the first non-magnetic block, and the thin film is etched into stripes at predetermined intervals. The first non-magnetic material block and the second non-magnetic material block which does not form the striped main magnetic pole film group are removed to form a striped main magnetic pole film group. They are sandwiched together, and an adhesive is injected into the gap between the two valve magnetic blocks formed by sandwiching the striped main pole film group to join the two valve magnetic blocks to form a main pole member. This main pole part shape body is sliced to a predetermined thickness in a direction perpendicular to the striped main pole film group, and this is used as a head part original plate, and the striped main pole film group cut by the slicing is used as a plurality of main poles. A main magnetic pole group is a collection of the main magnetic pole group, and a head prototype plate is superimposed on the upper surface of the core prototype body and fixed with adhesive so that the main magnetic pole group stands up on the main core prototype body, and this is used as a head prototype body, The head prototype is sliced vertically to a predetermined thickness so that each main pole is located in the center, the top surface of the sliced head body is processed into a predetermined curved surface, and a coil is wound around the main core. In a method for manufacturing a perpendicular magnetic recording head; a thin film with high magnetic permeability and high saturation magnetic flux density is removed in stripes at predetermined intervals by etching. A vertical groove is provided on the side surface of the second non-magnetic block.

(Function) Both valves are formed when the first non-magnetic block and the second non-magnetic block that does not form the striped main magnetic pole film group are put together with the striped main magnetic pole film group sandwiched therebetween. The vertical groove is located within the gap between the magnetic blocks.

Therefore, when adhesive is injected into the gap, the adhesive quickly descends to the bottom along the groove, and spreads laterally due to the frebus effect, spreading throughout the gap, and as a result, both non-magnetic blocks become strong. Glued. □ Also, when slicing the original head body □ in the longitudinal direction, the groove will serve as a guide for the cut line, especially when the groove is provided at the center position between adjacent main magnetic poles (center position of the gap). In order to do this, the blade of a slining machine such as a dicer is aligned with the groove and sliced, and the main magnetic pole 2 is placed at the center of the resulting sectioned head body.
Become the Koki where 4 is located.

(Embodiment) A method of manufacturing a main pole excitation type perpendicular magnetic recording head according to an embodiment of the present invention will be described with reference to FIGS. 1 to 9. FIG.

First, as shown in FIG. 2, a high magnetic permeability, high saturation magnetic flux density film such as an amorphous soft magnetic film with a thickness dl of about 0.3 μm is coated on one side of a non-magnetic block 10 made of rectangular prism-shaped glass, ceramic, etc. The thin film 12 is formed by vapor deposition or sputtering, and then the thin film 12 is removed by etching in stripes in the vertical direction at regular intervals S of about 700 μm, as shown in FIG. A magnetic pole film group 14 is formed. Next, as shown in FIG. 4, the non-magnetic block side portion 10c between the striped main poles 14
At the center position, use a slicing machine such as a dicer to a depth d.
A groove 16 is formed in which l is approximately 50 μm and width wl is approximately 50 μm.

Next, as shown in FIG. 1, the main pole film group 14 and another non-magnetic block 18 in which the grooves 16 are not formed are combined with the non-magnetic plate 10 and held with a jig to form each of the grooves 16. −
Inject an appropriate amount of adhesive from L using a thin nozzle. Then, as shown in FIG. 5, the adhesive injected into each of the grooves 16 quickly descends to the bottom as indicated by the dotted arrows in the figure, and spreads laterally due to the frebus effect to cover the entire gap G. As a result, Ryokawa magnetic block 10
．． 18 is firmly adhered. Note that if an adhesive that changes color when cured is used, it can be easily confirmed that the adhesive has reached the bottom of the gap g.

The main magnetic pole part shaped body 20 formed in this way is
As shown in the figure, similarly to the prior art, the main pole film group 14 is sliced into a predetermined thickness d3 of, for example, about 100 μm in the direction perpendicular to the main pole film group 14, and this is used as the head part original plate 22, and the sliced main pole film is The group 14 is referred to as a main magnetic pole group 24. Then the seventh
As shown in the figure, the head original plate 22 is stacked on the upper surface of the core original body 26 which has been manufactured in advance in the same way as in the prior art, so that the main magnetic pole group 24 is erected on the main core original body 28-L. They are then glued and fixed together to form a head original body 30.

Next, the head prototype 30 is sliced at intervals or widths of d4 by aligning the blade of the slicer with the groove 16. That is, in this embodiment, the groove 16 becomes the cut line, but since the groove 16 is formed at the center position between the main magnetic poles 24, when slicing passes through the groove 16, the resulting section-shaped head body 32 The main magnetic pole 24 is located at the center position (FIG. 8). Note that since the groove 16 has a depth of 50 μm, it can be easily detected with the naked eye, and alignment of the slicer blade is easy.

Head body 32 obtained by such a slicing process
The upper surface of the main core 34 is polished into an R-shape or a hyperpolished shape as shown in FIG. 9, and then a coil 36 is wound around the main core 34 to complete a perpendicular magnetic recording head 38.

Note that instead of providing the groove 16 on the non-magnetic block 10 side, the groove 16 may be provided on the opposing side surface of the non-magnetic block 18, or it is also possible to provide it on both of these blocks. Further, the shape of the groove 16 is not limited to a square or a square, but can be any shape such as a semicircle and a trapezoid. Furthermore, the groove width w2 is not limited to approximately 50 μm and the depth dl of one groove is approximately 50 μm step, but may be freely determined depending on the type and type of magnetic head.

(Effects of the Invention) In the present invention, the gap between the frame magnetic blocks is formed when the first non-magnetic block and the second non-magnetic block are put together with the striped main pole film group in between. A groove is provided inside, and when adhesive is injected into the gap, the adhesive spreads over the entire gap due to the action of the groove and the Ryogawa magnetic blocks are firmly joined. The spacing between the band groups can be made small, which makes it possible to mass-produce high-strength, high-quality heads.Also, the grooves serve as a guideline for the cut line in the process of slicing the head prototype in the longitudinal direction to create section-shaped heads. Processing is easy and processing accuracy is improved.

[Brief explanation of drawings]

1 to 9 are diagrams for explaining a method of manufacturing a main pole excitation type perpendicular magnetic recording head according to an embodiment of the present invention; FIG. Figure 2 shows thin film 1.
3 is a perspective view of a non-magnetic block 10 formed with a striped main pole film group 14, and FIG. 4 is a perspective view of a non-magnetic block 10 formed with a striped main pole film group 14. FIG. 5 is a perspective view showing the effect when adhesive is injected into the gap g from the groove 16, FIG. 6 is a perspective view of the head original plate 22, FIG. 7 is a perspective view of the head original body 30, FIG. 8 is a perspective view of the sectioned head body 32, and FIG. 9 is a perspective view of the completed perpendicular magnetic recording head 38. FIG. 10 is a side view showing an example of a main pole excitation type perpendicular magnetic recording head, and FIGS. 11 to 18 are diagrams for explaining a method of manufacturing a conventional main pole excitation type perpendicular magnetic recording head. Yes; FIG. 11 is a perspective view of the core original body 125, FIG. 12 is a perspective view of a non-magnetic block 126 formed with an amorphous soft magnetic film 128, and FIG. 13 is a perspective view of a striped main magnetic pole band group 130. FIG. 14 is a perspective view of the main magnetic pole member 134, FIG. 15 is a perspective view of the head prototype plate 136, and FIG. 16 is a perspective view of the head prototype 140. FIG. 17 is a perspective view of the sectioned head body 144, and FIG. 18 is a completed perpendicular magnetic recording head 38.
FIG. 10.18...Nonmagnetic block, 14...Main magnetic pole film group, 16...Groove, g...Gap, 20...
...Main magnetic pole original body 30...Head original form body, 32...
... Sectioned head body.

Claims (2)

[Claims] (1) Two parallel grooves are formed in the longitudinal direction of one side of the ferrite block to serve as a core prototype body, the protrusions sandwiched between the two grooves are used as the main core prototype body, and the first A thin film with high magnetic permeability and high saturation magnetic flux density is formed on one side of the non-magnetic block, and the thin film is removed in stripes at predetermined intervals by etching to form a group of striped main pole films, and the main pole film is A non-magnetic material block forming a group and another second non-magnetic material block not forming the main magnetic pole film group are put together so as to sandwich the main magnetic pole film group, and the main magnetic pole film group is sandwiched. An adhesive is injected into each of the gaps between the non-magnetic blocks, and the adhesive enters the gaps to join the non-magnetic blocks to form a head part original body. The original body is sliced to a predetermined thickness in a direction perpendicular to the main magnetic pole film group, and this is used as a head original plate. The head part original plate is overlaid and adhesively fixed on the upper surface of the core original body so that the main magnetic pole group is erected on the main core original body, and this is used as a head original body, The original body is sliced vertically to a predetermined thickness so that each of the main magnetic poles is located in the center, the upper surface of the sliced head body is processed into a predetermined curved surface, and a coil is wound around the main core to vertically In the method of manufacturing a magnetic recording head, the thin film having high magnetic permeability and high saturation magnetic flux density is removed in stripes at predetermined intervals by etching, or the side surface of the first non-magnetic block opposite to the side surface of the first non-magnetic block. A method for manufacturing a perpendicular magnetic recording head, characterized in that a vertical groove is provided on a side surface of a second non-magnetic block. (2) The method of manufacturing a perpendicular magnetic recording head according to claim 1, wherein the groove is provided at a central position between the adjacent main pole films.