JPH0718008Y2 - Floating magnetic head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a floating magnetic head, and more particularly to a floating magnetic head having an air bearing surface with excellent flatness.

[Prior art]

2. Description of the Related Art Conventionally, in a magnetic disk device, as a magnetic head for performing magnetic recording, a floating magnetic head that is levitated by an air flow accompanying the rotation of the magnetic disk is known.

An example of a conventional floating magnetic head is shown in FIG.

The floating magnetic head 1'is basically composed of a slider 2'made of ceramic or the like, a magnetic core 3 ', and a coil winding (not shown).

On the surface of the slider 2'opposed to the magnetic disk, two levitation rails 4 ', 5'extending from the air inflow end side to the air outflow end side are provided in parallel with each other.
The surface of the levitation rails 4 ', 5'has a flat portion 6a' and a tapered portion.
6b 'are formed. Especially, in this flat portion 6a', a levitation force is generated by the air flow generated by the rotation of the magnetic disk, and it is mirror-finished by lapping. The flat portions 6a 'of the floating rails 4'and 5'are referred to as air bearing surfaces (hereinafter abbreviated as ABS surfaces). Further, the slider 2'is provided with various grooves. That is, the air flow groove 7'on the opposite surface of the slider 2 ', the suspension groove 8'for mounting a spring loading device such as a gimbal on the back surface of the slider, and the air outflow end side end surface of the slider 2'. Is provided with a coil winding groove 9'and a magnetic core mounting groove 10 'for mounting the magnetic core 3'. On the other hand, the magnetic core 3'is made of a material such as ferrite, and the magnetic gap 11 'is formed by joining a pair of bars.
Magnetic core mounting groove 1 so that it is exposed on the ABS surface
It is attached and fixed to 0'with glass or the like. A coil winding is wound around the fixed magnetic core 3'using the coil winding groove 9 '.

By the way, in recent years, along with the miniaturization of magnetic disk devices and high-density recording, miniaturization of magnetic heads has been promoted, and in particular, there is a strong demand for reducing the flying height of the magnetic head to about 0.1 μm. Therefore, the floating magnetic head AB
It has become necessary to finish the S-plane flatness more precisely and accurately.

[Problems to be solved by the invention]

However, the conventional floating type magnetic head shown in FIG.
As described above, since the plurality of grooves are provided, the strength of the slider 2'is unstable, and the final flat processing (lap processing) of the ABS surfaces of the levitation rails 4 ', 5'of the slider 2'especially the deflection. Is likely to occur and the accuracy of the flatness of the ABS surface is poor. In particular, since the projection 12 'formed by providing the coil winding groove 9'is thin, its strength is weak. On the side of the levitation rail 4'on which the magnetic core 3'of the protrusion 12 'is provided, the flatness is relatively good on the ABS side due to the magnetic core 3'acting as a reinforcing material, but the other levitation rail 5'. On the side, since there is no reinforcing member, there is a problem that flatness is particularly deteriorated due to deflection on the ABS surface in the vicinity thereof.

[Means for solving problems]

The present invention has been devised in view of the above problems,
The purpose is to prevent ABS from bending.
In addition to improving the accuracy of the flatness of the surface, the coil winding groove can be easily formed by grinding, and the strength of the slider and the workability of the coil winding are improved.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to FIGS.

FIG. 1 is a perspective view showing an embodiment of the floating magnetic head of the present invention. In the figure, 1 is a floating magnetic head, 2 is a slider, and 3 is a magnetic core.

The slider 2 is provided with two levitation rails 4a and 4b on the surface facing a recording magnetic medium such as a magnetic disk and an air flow groove 5 is formed. A magnetic core mounting groove 6 for mounting the magnetic core 3 from the end face 8 toward the inside is provided at the rear end portion of one of the levitation rails 4a on the air outflow end side. , The magnetic core 3 is fixed by an adhesive such as glass so that the magnetic gap 7 of the magnetic core 3 is exposed on the ABS surface. A coil winding groove 9 is provided on the end face 8 on the air outflow end side of the slider 2 so as to partially intersect the magnetic core mounting groove 6 and is exposed from the coil winding groove 9. Magnetic core 3
A coil winding (not shown) is wound around.

According to the present invention, the magnetic core 3 in the coil winding groove 9 is reinforced at the corresponding position on the side of the levitation rail 4b where the magnetic core 3 is not mounted.
11 are provided. That is, the coil winding groove 9 has an opening 9a in the end face 8 on the air outflow end side of the slider 2 and a side face 10 on the levitation rail 4a (the levitation rail on which the magnetic core 3 is mounted) side.
The depth surface 9c is formed so as to have 9b and connects the openings 9a and 9b with an inclined surface that is one surface inclined with respect to the air outflow side end surface 8 of the slider 2.

In such a coil winding groove 9, the magnetic core 3 is mounted on the levitation rail 4a side, and the reinforcing portion 11 is formed on the levitation rail 4b side.
When forming the ABS surfaces of the levitation rails 4a and 4b, even if a lapping process is performed by applying a predetermined load from the facing surface side of the slider 2, it is possible to effectively prevent the occurrence of deflection at the protruding portion 12 of the coil winding groove 9. can do.

Further, since the depth surface 9c of the coil winding groove 9 is formed by one surface, when forming the coil winding groove 9,
For example, it can be easily formed by grinding so that the tip of the grindstone for rotary grinding is along the surface to be the depth surface 9c. Further, since only the amount necessary for winding the coil winding around the magnetic core 3 is ground, the amount of grinding removal is reduced and the strength of the slider 2 is improved. Further, when the coil winding is wound around the magnetic core 3, the tip of the coil winding is inserted through one opening, for example, 9a, and the depth surface 9c is guided along the other opening 9b. Therefore, the winding workability is improved.

The width a of the end face 8 on the air outflow end side of the reinforcing portion 11 remaining by the above-described grinding process is a range of 0.03 to 0.8 with respect to the entire width 1 of the end face 8 on the air outflow end side of the slider 2. Is appropriate. If the a / l ratio is less than 0.03, chipping or the like is likely to occur during processing of the coil winding groove 9. When the a / l ratio exceeds 0.8, the coil winding of a predetermined number of turns cannot be wound around the magnetic core 3.

FIG. 2 is an external view showing another embodiment of the present invention.

In this embodiment, the coil winding groove 9 has openings 9a and 9b in the end surface 8 on the air outflow end side of the slider 2 and the side surface 10 on the levitation rail 4a (floating rail on which the magnetic core 3 is mounted) side. In addition to being formed in this manner, the depth surface 9c that connects the openings 9a and 9b is formed as a single substantially circular arc surface.

In producing the floating magnetic head of the present invention, an air flow groove, a suspension groove, a coil winding groove 9 having a depth surface formed as an inclined surface or a substantially arc surface, and a magnetic core mounting groove 6 are formed. For slider 2,
A magnetic gap 7 is formed by joining a pair of magnetic materials such as ferrite.
The magnetic core 3 in which is formed is inserted into the core mounting groove 6, and an adhesive such as glass is filled between the magnetic core 3 and the magnetic core 3 to be fixed to the slider 2.

Then, a means such as wrapping is applied to the flat portions of the floating rails 4a and 4b of the slider 2 to finish the head as a product. When incorporated in a magnetic head device, a coil winding is wound around the magnetic core 3, a spring load applying device such as a gimbal is attached to the back side of the slider 2, and the head arm is set through this adding device.

Next, the flat workability of the floating magnetic head of the present invention and the conventional floating magnetic head was examined. Calcium titanate as slider 2 material, Mn as magnetic core 3 material
Using the -Zn ferrite, the conventional floating magnetic head shown in FIG. 3 and the floating magnetic head of the present invention shown in FIG. The flat part was lapped.

With 100 samples, flatness 0.5μ, 0.4μ, 0.3μ was manufactured as a standard, and the pass rate was obtained. The results are shown in Table 1.

As is clear from Table 1, the floating magnetic head of the present invention showed excellent flattenability in all standards.

[Effect of device]

As described above in detail, the floating magnetic head of the present invention has the ABS surface formed by forming the coil winding groove by providing the reinforcing portion in a part of the coil winding groove provided in the slider. It is possible to achieve excellent flat workability by eliminating the occurrence of twisting, eliminating the deterioration of the accuracy of flatness. Further, since the depth surface of the coil winding groove is formed by one surface of the inclined surface with respect to the air outflow end surface, or a substantially circular arc surface, grinding of the coil winding groove can be performed by a series of processes,
In addition, the amount of grinding removal by grinding is reduced, and the strength of the slider is improved.

Therefore, it is possible to provide a floating magnetic head capable of coping with miniaturization and high density recording of the magnetic disk device.

[Brief description of drawings]

FIG. 1 is a perspective view showing one embodiment of the floating magnetic head of the present invention, and FIG. 2 is a perspective view of a main part showing another embodiment of the shape of the coil winding groove in the floating magnetic head of FIG. Figure, third
The figure is a perspective view of a conventional floating magnetic head. 1 ... Floating magnetic head 2 ... Slider 3 ... Magnetic core 4a, 4b ... Levitation rail 6 ... Magnetic core mounting groove 7 ... Magnetic gap 9 ... Coil winding groove 11 ... Reinforcement part

Claims (1)

[Scope of utility model registration request] 1. A plurality of levitation rails formed on a surface facing a magnetic recording medium, and a magnet formed inwardly from the air outflow end side end surface in the longitudinal direction of one of the levitation rails. A magnetic core is attached to a slider having a core mounting groove and a coil winding groove that intersects with the magnetic core mounting groove, with a magnetic gap exposed on the facing surface of the slider, and a coil is attached to the magnetic core. A floating magnetic head formed by winding a winding, wherein the coil winding groove is formed as one depth surface of an inclined surface or a substantially arc surface so as to open to an air outflow end side surface and a side surface of a slider. A floating magnetic head having an opening.