JPH05128769A - Levitating type magnetic head - Google Patents

Abstract

PURPOSE:To prevent the deterioration in the electromagnetic conversion characteristics of the head arising from the recessing of the front gap part of a core slider from a floating surface by a shrinkage of a resin and an increasing in the gap loss of the head at a head gimbal assay in which a gimbal places also above the magnetic core on the side which a coil wire for reading and writing of the core slider is wound. CONSTITUTION:A resin flow preventive groove 14a is provided on the surface of the gimbal 6 to be mounted to the magnetic core 2 constituting a part of the slider or a resin flow preventive groove 17a is provided on the surface for mounting the magnetic core 2 to the gimbal 2 so as to prevent the inflow of a resin 4 for adhesion to the back gap part 11 of the core slider 3. Since the resin 4 does not flow to the back gap part 11 of the core slider 3, the recessing of the front gap part 10 of the core slider 3 from the levitating surface by the bending moment generated by the shrinkage of the resin 4 is eliminated and the parting from the magnetic recording medium 15 by the set floating quantity or above is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floating magnetic head for a fixed magnetic disk device used for recording / reproducing data in a computer or the like, in which deterioration of electromagnetic conversion characteristics of the head is eliminated.

[0002]

2. Description of the Related Art A conventional floating magnetic head will be described below. As shown in FIG. 10 and FIG.
A magnetic core 1 (hereinafter, referred to as a block A) that forms a magnetic circuit configuration part around which a coil wire 5 for writing is wound, and a slider having an air bearing surface for obtaining a lift force by an air flow generated by rotation of a magnetic recording medium 15. Part of magnetic core 2
The core slider 3 is configured by adhesively fixing (hereinafter, referred to as block B) with a bonding glass. This bonding glass is used for the front gap portion 1 of the core slider 3.
0 and the back gap portion 11. The floating posture of the core slider 3 is maintained by the gimbal 6 attached to the load arm 7 and having a load that balances the lift due to the air flow.

Front gap portion 1 of core slider 3
0 is formed at the minimum gap position of the slider surface of the core slider 3 which faces the magnetic recording medium 15 in order to obtain a higher recording density and a larger output as it gets closer to the surface of the magnetic recording medium 15. And the minimum gap position of this slider surface is
Shape of slider surface, load and position of load action point 13
(Hereinafter referred to as the load point).
L ₁ in the drawing is from the tip portion 16 of the gimbal 6 to the gimbal 6
Is the distance to the center of the pivot 12 having the outer diameter dimension a of L, and L is from the back gap portion 11 of the core slider 3 to the gimbal 6
It is the distance to the center of the pivot 12.

An insulating tube 9 for covering the read / write coil wire 5 is fixed to a part of the load arm 7 by a claw 8 formed by cutting and raising.

As the fixed magnetic disk device is made smaller and thinner, the core slider 3 is remarkably thinned.
The total height H of the core slider 3 is 0.5 to 0.9 mm, and the thickness t of the block A1 which is a magnetic circuit constituting portion is 0.2 to 0.
It is as thin as 45 mm and is easily deformed by an external load. The core slider 3 and the gimbal 6 are usually adhered and fixed by interposing a resin 4 such as a thermosetting epoxy resin, but the longitudinal centerline of the gimbal 6 is the longitudinal centerline of the core slider 3 (head. Of the core slider 3 as represented by a type (referred to as an in-line type) installed in parallel with the virtual center line connecting the air inflow end and the air outflow end of the block. A
The gimbal 6 is also located on top of 1, and the resin 4 that has flowed into the back gap portion 11 located on the joint surface between the block A1 and the block B2 contracts to generate a bending moment in the direction indicated by the arrow M, causing the surface to float. Compared to the block B2 having a surface, the winding block A1 having a smaller thickness t is recessed from the air bearing surface by a distance D (about 80 nm), and the front gap of the core slider 3 located at the joint surface between the block A1 and the block B2 is depressed. The portion 10 is recessed from the air bearing surface of the core slider 3 by a distance d (about 60 nm), and the magnetic recording medium surface 1
Away from 5, increasing the head gap.

[0006]

In the above-mentioned conventional configuration, the head electromagnetic conversion characteristics such as the deterioration of the head recording capacity and the reduction of the reproduction output occur with the increase of the head gap from the air bearing surface of the block A1. Had problems.

The present invention solves the above-mentioned conventional problems. The flying height of the block A does not exceed the set flying height.
It is an object of the present invention to provide a floating magnetic head in which the deterioration of the head electromagnetic conversion characteristics such as the deterioration of the head recording ability and the reduction of the reproduction output is eliminated.

[0008]

In order to achieve this object, the floating magnetic head of the present invention is mounted on the mounting surface of the gimbal on the block B so that the adhesive resin does not flow into the back gap portion of the core slider. Or a resin flow prevention groove is provided on the mounting surface of the block B to the gimbal.

[0009]

With this structure, since the resin does not flow into the back gap portion, even if a bending moment is generated due to the contraction of the resin, the block A does not become recessed from the air bearing surface and the flying height of the block A does not exceed the set flying height.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 and 6 to 8 showing an embodiment of the present invention, the same parts as those in the conventional example are designated by the same reference numerals and the description thereof will be omitted.

(Embodiment 1) As shown in FIGS. 1 to 4, within the range of the distance L ₁ from the tip portion 16 of the gimbal 6 to the center of the pivot 12 of the gimbal 6, and in the back gap portion of the core slider 3. The block B2 of the gimbal 6 is located at a position of a distance l from the tip 16 of the gimbal 6 within a distance L from the center 11 of the gimbal 6 to the center of the pivot 12 of the gimbal 6.
A resin flow prevention groove 14a having a width W and a depth h is formed so that the resin 4 such as a thermosetting epoxy resin does not flow into the back gap portion 11 located on the joint surface of the block A1 and the block B2 on the mounting surface of and. This is the configuration provided. Width W here
Is a dimension not exceeding L ₁ −a / 2−1, and the depth h is
It should be 0.2 mm or less. With this configuration, since the resin 4 such as thermosetting epoxy resin does not flow into the back gap portion 11, even if the bending moment in the direction indicated by the arrow M is generated due to the contraction of the resin 4, as compared with the bending moment of the conventional example. The phenomenon that the winding block A1 of the core slider 3 is recessed from the air bearing surface due to a small bending moment does not occur, and the phenomenon that the front gap portion 10 of the core slider 3 is recessed from the air bearing surface of the core slider 3 does not occur. FIG. 3 shows the adhesion position of the resin 4 when the blocks A1 and B2 and the gimbal 6 are adhered, which is recommended for effectively operating the present embodiment. The resin 4 is the same as the block B2 of the gimbal 6. It is attached only to the attachment surface of the back gap portion 11 and to the opposite side of the back gap portion 11 via the resin flow prevention groove 14a. The flatness of the air bearing surface of the core slider 3 of the floating magnetic head according to this embodiment and the flatness of the air bearing surface of the core slider 3 of the conventional floating magnetic head are shown in comparison with FIG. As is clear from FIG. 5, the amount of change in the front gap portion 10 of the core slider 3 according to the present embodiment is 0 nm, and there is no effect of recessing the winding block A1 of the core slider 3 from the air bearing surface by a bending moment. I understand. On the other hand, in the conventional core slider 3, the wound block A1 is recessed from the air bearing surface by about 80 nm, and the front gap portion 10 of the core slider 3 located at the joint surface between the block A1 and the block B2 has the core slider 3
It can be seen that it is recessed from the air bearing surface by about 60 nm. As described above, in the floating magnetic head using the gimbal 6 of this embodiment, even if a bending moment occurs due to the contraction of the resin 4, it is smaller than the conventional bending moment, and this bending moment causes the core slider 3 to move. There is no effect of denting the wound block A1 from the air bearing surface, and it is possible to prevent the front gap portion 10 of the core slider 3 located at the joint surface between the blocks A1 and B2 from denting from the air bearing surface of the core slider 3. Therefore, the head is not separated from the surface of the magnetic recording medium 15 by the set flying height or more, and it is possible to prevent the deterioration of the head electromagnetic conversion characteristics such as the deterioration of the head recording ability and the decrease of the reproduction output due to the increase of the head void loss.

Incidentally, the resin flow prevention groove 14 according to the present embodiment.
The shape of a has a rectangular cross section as shown in FIG. 4 (a), but it has an inverted U shape as shown in FIG. 4 (b) or (c).
It may have a V-shaped or inverted V-shaped cross section.

(Second Embodiment) A second embodiment of the present invention will be described below with reference to the drawings.

As shown in FIGS. 6 and 7, the difference from the configuration of the first embodiment is that the resin flow prevention groove 14a provided in the gimbal 6 is replaced by a resin on the mounting surface of the gimbal 6 of the block B2. The point is that the flow prevention groove 17a is provided. The resin flow prevention groove 17a is heat-cured on the back gap portion 11 located at the joint surface of the blocks A1 and B2 within the range of the distance L from the back gap portion 11 of the core slider 3 to the center of the pivot 12 of the gimbal 6. It is formed in a shape having a width V and a depth i at a distance m from the back gap portion 11 so that the resin 4 such as a mold epoxy resin does not flow in. Here, the width V is a dimension not exceeding La-2-m, and the depth i is 0.2 mm or less. With this configuration, since the resin 4 does not flow into the back gap portion 11, the first gap
It is possible to obtain the same effect as the effect described in the embodiment.

FIG. 8 shows the attachment position of the resin 4 when the core slider 3 and the gimbal 6 are adhered to each other, which is recommended in order to effectively operate this embodiment. The resin 4 is the gimbal of the block B2. It is attached only to the mounting surface of No. 6, and is attached to the opposite side of the back gap portion 11 via the resin flow prevention groove 17a.

As shown in FIG. 9A, the resin flow prevention groove 17a has a rectangular cross section, but FIG.
Alternatively, as shown in (c), it may have a U-shaped or V-shaped cross section.

[0018]

As is apparent from the above description of the embodiments, the present invention is provided on the mounting surface of the gimbal on the block B, so that the adhesive resin does not flow into the back gap portion of the core slider, or By providing the resin flow prevention groove on the mounting surface of the block B to the gimbal, it is possible to realize an excellent floating magnetic head that eliminates the deterioration of the head electromagnetic conversion characteristics such as the deterioration of the head recording capacity and the reduction of the reproduction output. It is a thing.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing the concept of the essential parts of a floating magnetic head according to a first embodiment of the present invention.

FIG. 2 is a schematic perspective view of a main part of the floating magnetic head.

FIG. 3 is a schematic exploded cross-sectional view of an essential part showing an adhesion position of an adhesive resin when the gimbal of the floating magnetic head is adhered.

FIG. 4 is a schematic cross-sectional view of a resin flow prevention groove of the floating magnetic head.

FIG. 5A is a graph showing the flatness of the air bearing surface of the core slider of the floating magnetic head; FIG. 5B is a graph showing the flatness of the air bearing surface of the core slider of the conventional floating magnetic head.

FIG. 6 is a schematic sectional view showing the concept of the essential parts of a floating magnetic head according to a second embodiment of the invention.

FIG. 7 is a schematic perspective view of a main part of the floating magnetic head.

FIG. 8 is an exploded cross-sectional schematic view of a main part showing an adhesion position of an adhesive resin when the gimbal of the floating magnetic head is adhered.

FIG. 9 is a schematic cross-sectional view of a resin flow prevention groove of the floating magnetic head.

FIG. 10 is a schematic sectional view showing the concept of a main part of a conventional floating magnetic head.

FIG. 11 is a schematic perspective view of a main part of the floating magnetic head.

[Explanation of symbols]

 3 core slider 6 gimbal 10 front gap part 11 back gap part 12 pivot 14a resin flow prevention groove 17a resin flow prevention groove

Claims (2)

[Claims] 1. A magnetic core, which constitutes a magnetic circuit forming portion around which a read / write coil wire is wound, and a slider portion having an air bearing surface for obtaining lift due to an air flow generated by rotation of a magnetic recording medium. In a head gimbal assay in which the longitudinal centerline of the gimbal that adjusts the flying posture of the core slider configured by adhesively fixing the magnetic core and the bonding glass is parallel to the longitudinal centerline of the core slider. And within the range from the tip of the gimbal to the center of the gimbal pivot, and
For adhesion of the gimbal and the magnetic core forming the slider part on the attachment surface of the gimbal to the magnetic core forming the slider part within a range from the back gap part of the core slider to the center of the pivot part of the gimbal 2. A floating magnetic head having a resin flow prevention groove for preventing the resin from flowing into the back gap portion. 2. A magnetic core, which constitutes a magnetic circuit forming portion around which a read / write coil wire is wound, and a slider portion having an air bearing surface for obtaining a lift force due to an air flow generated by the rotation of a magnetic recording medium. A head gimbal assay in which the longitudinal centerline of the gimbal that adjusts the flying posture of the core slider that is adhesively fixed to the magnetic core by the bonding glass is parallel to the longitudinal centerline of the core slider. Adhesion of the magnetic core forming the slider to the gimbal on the mounting surface of the magnetic core forming the core slider within the range from the back gap portion of the core slider to the center of the pivot of the gimbal. Floating magnetic head having a resin flow prevention groove for preventing resin for use from flowing into the back gap portion.