JPS6190309A - Magnetic head for vertical magnetic recording - Google Patents

Abstract

PURPOSE:To realize exact erasing by making the recording/reproducing coil and erasing coil different in height and partially overlapping the coils to be able to reduce the clearance between the magnetic thin films on the coils. CONSTITUTION:The recording/reproducing coil 25 of the recording/reproducing core block 20 and the erasing coil 35 of the erasing core block 30 are made different in height and arranged in such a way that the coils 25 and 35 partially overlap each other as seen from the slider assembly 10. This makes it possible to reduce the clearance 1 between the recording/reproducing magnetic thin film 13 of the assembly 10 and the erasing magnetic thin film 14 to be proved on both coils. This realizes exact erasing even for recording media with small diameter and inner diameter past of a medium.

Description

[Detailed Description of the Invention] [Technical Field J] The present invention relates to a magnetic head for perpendicular magnetic recording used in a magnetic recording device, and in particular, the present invention relates to a magnetic head for perpendicular magnetic recording used in a magnetic recording device.
Regarding the improvement of the magnetic head proposed in the issue.

"Prior art and its problems" First, with regard to Figures 6 to 8,
The magnetic head H proposed in No. 8749 will be explained.

This magnetic head H is a conventional magnetic head of this kind, that is, a type of magnetic head in which a magnetic recording medium is provided with a magnetic thin film for recording +1 + an Ikukawa magnetic thin film and a magnetic thin film for erasing, for recording and reproducing. The magnetic thin film and magnetic core on the side and the magnetic thin film and magnetic core on the erasing side were vertically divided and formed separately, and the two were later joined with a central slider member sandwiched between them. This solution solves the drawbacks that occur in

In the state of junction 10, this magnetic helad H is the seventh
As shown in the figure, it consists of three members: a slider assembly 10, a core block 20 on the recording and reproducing side, and a core block 30 on the erasing side. The slider assembly IO has a magnetic thin film 13 for recording/reproducing and a magnetic thin film 14.1 for erasing on the surfaces of left and right slider bases 11.12 made of non-magnetic material, respectively.
4, a center block 15 made of a non-magnetic material is sandwiched between the two, and these are bonded together with an adhesive layer 16. This slider set η body 10 is
After cutting a long material to a required thickness, the surface is polished. Recording and reproducing coils 11 and 13 and erasing magnetism! The +1 layer 14 is made of, for example, a CO-based amorphous, permalloy, or sendust-based magnetic material, and is formed on the surface of the slider base 11, 12 by a deposition method, a sputtering method, an epitaxy method, or the like.

On the other hand, the recording/reproducing side core block 20 and the erasing side core block 30 are block bodies made of magnetic material, and correspond to the necessary winding grooves 21, 31, the magnetic thin film 13 for recording/reproducing, and the erasing coils n and 14. A recording/reproducing coil 23 is formed in the winding groove 21 and the winding groove 31, respectively.
, and is wound with an erasing coil 33. The recording and reproducing side core block 20 and the erasing side core block 30 can also be made of long materials and cut into required lengths.

Above slider assembly 10. Recording/playback side core block 2
0 and the erasing side core block 30 are in close contact with each other, as shown in FIG.
are joined to each other in close contact with the recording/reproducing coil 13 and the erasing magnetic thin film 14, thereby forming a magnetic head H.

The magnetic head H described in 1- above can be efficiently produced with high precision due to its structure. In particular, the magnetic thin film 13 for recording and the magnetic thin film 14 for erasing are attached to the slider assembly 1 in advance.
0, the positional relationship and spacing between them can be made precise, and furthermore, the spacing shown in FIG.
A magnetic recording medium (floppy disk) with a small radius of curvature also has the characteristic of being capable of high-density recording. That is, magnetic recording has a small radius of curvature due to the nature of recording in the effective recording width W of the magnetic thin film 13 for recording and reproducing, and erasing both sides with a pair of erasing heads 14 to regulate the recording width W. In order to perform high-density recording on a magnetic recording medium, it is advantageous that the distance between the magnetic thin films 13 and 14 is short. The arrow indicates the running direction of the magnetic recording medium.

Further, according to this magnetic head H, the recording/reproducing coil 23
The erasing coil 33 can be wound around the open winding grooves 21 and 31 before joining the slider assembly 10 and the core block 20.30, so it has excellent features such as good workability. There is.

By the way, it has been explained that according to the magnetic head H, the spacing between the magnetic thin films 13 and 14 can be made small, but if this spacing can be made small, it is preferable to make it even smaller. This situation will be explained in more detail. When the distance between the rotation center 0 of the magnetic recording medium and the magnetic head H is small, that is, when the diameter of the magnetic recording medium is small, or when performing magnetic recording close to the center, the magnetic recording medium On the other hand, it moves in a small circular arc C. Therefore, if the distance between the magnetic thin films 13 and 14 is large, when erasing both sides of the effective recording width W recorded by the magnetic thin film 13 for recording and reproducing with the magnetic thin film 14 for erasing, the position to be erased will be the original position. It deviates from the This causes a problem that recording cannot be performed on a magnetic recording medium having a small diameter, or that the inner diameter portion of the magnetic recording medium cannot be effectively used.

“Object of the Invention” The present invention is based on this viewpoint” Patent Application No. 2, No. 59-13874
It is an object of the present invention to further improve the invention of No. 9 and to obtain a magnetic head in which the distance between the recording/reproducing magnetic thin film and the erasing ω thin film can be further narrowed.

"Summary of the Invention" The present invention further improves the arrangement positions of the recording/reproducing coil and the erasing coil provided in the recording/reproducing side core block and the erasing side core block, respectively. This was done based on the idea of reducing the spacing between the magnetic thin sheets 9, and the height positions of the recording/reproducing coil and the erasing coil are different, and both coils are viewed from the slider assembly side in a plan view. It is characterized by overlapping some parts. By partially overlapping both coils in this way, it is possible to reduce the arrangement interval between both coils, that is, the distance between the magnetic thin films for recording/reproducing and erasing.

"Embodiments of the Invention" The present invention will be described below with reference to illustrated embodiments. 1 and 2 correspond to FIGS. 6 and 7, and FIG. 1 shows the state in which the slider assembly 10, the recording/reproducing side core block 20, and the erasing side core block 30 are joined, and FIG. shows the state before these are joined.

The recording and reproducing side core block 20 and the erasing side core block 30 each have a leg portion 22.3 formed on the end surface on the joint surface side of both.
A winding groove 24.34 is formed in the vertical direction, that is, in a direction parallel to the extending direction of the magnetic thin film 13.14, around the central leg portions 22c and 32c of the magnetic thin film 13.14. This winding groove 24
．． 34 is a winding groove 24 on the recording/reproducing side core block 20 side.
Therefore, the winding groove 34 on the erasing side core block 30 side is formed deeper, and the recording/reproducing coil 25 and the erasing coil 35 fitted in the bottom of this winding groove 24.34 are positioned vertically. It's different. Furthermore, this recording/reproducing coil 25
When viewed from the slider assembly 10 side, the erasing coil 35 and the erasing coil 35 have a positional relationship in which they partially overlap as shown in FIGS. 3 to 5. A magnetic insulating spacer 40 made of a non-magnetic material is interposed below the erasing coil 35 between the joint surfaces of the recording/reproducing side core block 20 and the erasing side core block 30, and the thickness of this magnetic insulating spacer 40 is The recording/reproducing coil 25 and the erasing coil 35 can overlap by a certain amount. The upper ends of the legs 22c and 32c, around which the recording/reproducing coil 25 and the erasing coil 35 are wound, are in close contact with the magnetic thin films 13 and 14, respectively.

The magnetic insulating spacer 40 is a spacer as described above.
However, at the same time, the erasing coil 35
It also has the function of preventing the magnetic flux generated by flowing an erasing current from leaking to the recording/reproducing side core block 20 side, and preventing the recording magnetic field by the recording/reproducing coil 25 from being disturbed by the erasing magnetic field. ing. A separate patent application has been filed for this structure. The other constituent elements are the same as those of the magnetic head described in FIGS. 6 and 7, and the same elements are given the same reference numerals and the description thereof will be omitted.

In this magnetic head having the above configuration, the recording/reproducing coil 25 and the erasing coil 35 are located at different height positions, and moreover, both are partially over-ramped when viewed from above. Compared to the case where the erasing coils 35 are arranged at the same height position, the distance between the legs 22c and 32c is clearly smaller.
In other words, the distance between the recording/reproducing magnetic thin film 13 and the erasing magnetic thin film 14 that are brought into close contact with the leg portions 22c, 32c can be reduced.

"Effects of the Invention" As described above, the magnetic head of the present invention includes a slider assembly in which a recording/reproducing magnetic thin film and an erasing magnetic thin film are formed, a recording/reproducing side core block corresponding to the recording/reproducing magnetic thin film, In a magnetic head for perpendicular magnetic recording in which a magnetic thin film for erasing and a corresponding erase side core block are bonded to each other,
A recording/reproducing coil provided in the recording/reproducing side core block;
Since the erasing coil provided on the erasing side core block is partially overlapped in plan view, the distance between the recording/reproducing magnetic -υ film provided on this coil and the erasing coil +12 can be further reduced. Therefore, it is possible to perform good recording even in a portion close to the center of rotation of a rotating magnetic recording medium, and it is possible to perform high-density recording by effectively utilizing the inner diameter portion.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the magnetic head according to an embodiment of the present invention, showing the state in which each element is joined, FIG. 2 is a perspective view of the state before joining, and FIGS. 3, 4, and 5 are the same. A plan view, a front view, and a side view showing the slider assembly with the slider assembly removed, FIG.
9-138749, the present applicant proposed a perspective view of the joined state of each element of the magnetic head, FIG. 7 is a perspective view of the same before joining, and FIG. 8 is a perspective view of the magnetic thin film for recording and reproduction and the magnetic thin film for erasing. FIG. 3 is a plan view showing the relationship. lO...Slider assembly, 13...Magnetic thin film for recording and reproduction, 14...Magnetic thin film for erasing, 20...Recording and reproduction side core block, 30...Erasing side core block, 22
．． 32... Leg portion, 24. 34... Winding groove, 25...
・Recording/reproducing coil, 35... Erasing coil, 40・
...Magnetic insulation spacer. Figure 2 Figure 3 Figure 4

Claims (3)

[Claims] (1) A slider assembly made of a non-magnetic material and having a magnetic thin film for recording and reproduction and a magnetic thin film for erasing formed in a direction perpendicular to the magnetic recording medium; made of a magnetic material and located below the slider assembly; , a recording/reproducing side core block having a recording/reproducing coil corresponding to the recording/reproducing magnetic thin film;
A perpendicular magnetic field formed by bonding together an erasing-side core block, which is also made of magnetic material and has an erasing coil corresponding to the erasing magnetic thin film, and is located below the slider assembly and adjacent to the recording/reproducing-side core block. In the recording magnetic head, the height positions of the recording/reproducing coil of the recording/reproducing side core block and the erasing coil of the erasing core block are different, and both coils are arranged at the same height when viewed from the slider assembly side. A magnetic head for perpendicular magnetic recording, characterized in that parts overlap. (2) In claim 1, a recording/reproducing coil mounting groove parallel to the extending direction of the magnetic thin film formed on the recording/reproducing side core block and an extension of the magnetic thin film formed on the erasing side core block. A magnetic head for perpendicular magnetic recording whose depth is different from that of the mounting groove for the erasing coil, which is parallel to the direction. (3) A magnetic head for perpendicular magnetic recording according to claim 1 or 2, wherein a magnetic insulating spacer is interposed between the joining surfaces of the recording/reproducing side core block and the erasing side core block.