JPH04358376A - Floating type magnetic head - Google Patents

Abstract

PURPOSE:To provide the floating type magnetic head capable of preventing the deformation of a gimbal and the formation of a projecting part by a bending moment caused by the shrinkage of adhesive such as thermosetting epoxy resin, and preventing the damage of a magnetic recording medium and a gap part even when contact, start and stop operations are carried out for a long period of time, and excellent in electro-magnetic transducing characteristic. CONSTITUTION:This floating type magnetic head is constituted of a C type core 1 whose surface opposed to the gimbal is formed on an inclined part having a specified angle theta or a stepped part 13.

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 and reproducing data in computers and the like.

0002

[Prior Art] In recent years, fixed magnetic disk drives have become small and compact.
Various studies have been conducted with the aim of reducing the thickness of magnetic heads, and as a result, there is a noticeable trend toward thinning of floating magnetic heads. A floating magnetic head and a gimbal are usually bonded and fixed using a resin such as a thermosetting epoxy resin, but the longitudinal centerline of the gimbal is the same as the longitudinal centerline of the floating magnetic head (
The winding of a floating magnetic head is installed parallel to the imaginary center line connecting the air inflow end and air outflow end of the head (hereinafter referred to as the inline type). Various head gimbal assay (hereinafter referred to as HGA) type floating magnetic heads have been proposed in which a gimbal is also located above the C-shaped core on the side to which the object is to be measured.

A conventional floating magnetic head will be explained below. FIG. 3 is a perspective view of a conventional floating magnetic head, and FIG. 4 is a perspective view of a main part of a floating magnetic head drive section when the floating magnetic head is mounted in a magnetic disk drive device. 1 is a C-shaped core that constitutes a magnetic circuit, 2 is a slider with a floating rail etc. formed on the lower surface, 3 is a gap part, 4 is bonded glass, and 5 is a C-shaped core 1 and the slider via the gap part 3 2 is a floating magnetic head bonded with a bonding glass 4.

In FIG. 4, 6 is a read/write coil wire wound around a C-shaped core, 7 is a gimbal that is adhesively fixed to the floating magnetic head 5 via an adhesive 8 such as a thermosetting epoxy resin, 9 is load arm, 10 is load arm 9
11 is an insulating tube that covers the read/write coil wire 6 fixed to the claw 10, and 12 is a magnetic recording medium.

The operation of the floating magnetic head constructed as described above will be explained below. Magnetic recording medium 12
A load that balances the lift force due to the air flow generated by the rotation of the head is applied to the floating magnetic head 5 via the gimbal 7, and the floating attitude of the floating magnetic head 5 is maintained by the gimbal 7 attached to the load arm 9. The gap portion 3 of the floating magnetic head 5 is formed at the minimum gap position of the air bearing surface of the slider 2 facing the magnetic recording medium 12 in order to obtain higher recording density and larger output as it approaches the magnetic recording medium surface 12. Ru. The minimum gap position of the air bearing surface of the slider 2 is determined by the shape of the air bearing surface of the slider 2, the load, and the position of the point of application of the load.

[0006]

However, in the above-mentioned conventional configuration, a bending moment M is generated due to the contraction of the adhesive made of resin or the like, deforming the gimbal, and this deformation of the gimbal is caused by the C-shaped core of the floating magnetic head. is pressed by a load F, which causes the problem that the surface of the C-shaped core facing the magnetic recording medium protrudes convexly by a distance d (for example, about 100 nm) from the air bearing surface. In this state, the floating magnetic head is subjected to contact start/stop (hereinafter referred to as CS) for a long period of time.
Say S. ) will damage the surface of the magnetic recording medium and destroy the recorded information, and will also damage the gap part of the floating magnetic head located on the air bearing surface side of the C-shaped core. This has the problem of deteriorating electromagnetic conversion characteristics.

The present invention solves the above-mentioned conventional problems, and prevents the gimbal from deforming and forming protrusions due to bending moment caused by shrinkage of adhesive, etc., and prevents CS from forming over a long period of time.
It is an object of the present invention to provide a floating magnetic head with excellent electromagnetic conversion characteristics that does not damage a magnetic recording medium or a gap portion even when subjected to S.

[0008]

[Means for Solving the Problems] In order to achieve this object, the floating magnetic head of the present invention has a configuration in which the gimbal facing surface of the C-shaped core is formed as an inclined surface or a stepped portion having a predetermined angle. are doing.

[0009]

[Operation] With this configuration, even if the gimbal is deformed due to the bending moment M caused by the contraction of the adhesive, the C-shaped core will not be deformed because the gimbal-facing surface of the C-shaped core is formed of an inclined surface, etc. It is possible to prevent the formation of protrusions on the air bearing surface of the C-shaped core. Further, since no protrusion is formed on the air bearing surface of the C-shaped core, even if CSS is performed for a long time, the surface of the magnetic recording medium will not be damaged and the recorded information will not be destroyed. Further, since damage to the gap portion located on the air bearing surface side of the C-shaped core is prevented, deterioration of electromagnetic conversion characteristics does not occur. Furthermore, since the magnetic circuit can be shortened, the head efficiency can be improved and the electromagnetic conversion characteristics of the magnetic head can be improved.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of the floating magnetic head of this embodiment, and FIG. 2 is a perspective view of the main parts of the floating magnetic head drive unit when the floating magnetic head is mounted in a magnetic disk drive device. be.

1 is a C-shaped core, 2 is a slider, 3 is a gap portion, 4 is a bonding glass, 6 is a read/write coil wire,
7 is a gimbal, 8 is an adhesive, 9 is a load arm, 10 is a claw, 11 is an insulating tube, 12 is a magnetic recording medium,
Since these are similar to the conventional example, they are given the same numbers and their explanations are omitted.

Reference numeral 13 designates an inclined surface having an inclination angle θ in the range of 0°<θ≦45°, and 14 a floating magnetic head. Incidentally, instead of being an inclined surface, the inclined surface 13 may leave a joint portion with the slider and form a stepped portion. The inclined surface 13 and the like are formed by wrapping tape, machining, etc. to such an extent that the end portion thereof does not come into contact with the tip of the gimbal.

The functions of the inclined surface, etc. of the floating magnetic head of this embodiment constructed as above will be explained.

Even if the bending moment M is generated due to the contraction of the adhesive 8 such as a thermosetting epoxy resin and the gimbal 7 is deformed, the tip of the gimbal 7 will not come into contact with the C-shaped core 1 because of the inclined surface 13. Therefore, the C-shaped core 1 is not pushed downward. Since the C-shaped core 1 is not subjected to downward stress, no protrusion is formed on the surface of the C-shaped core 1 facing the magnetic recording medium, so that the surface of the magnetic recording medium 12 and the gap portion 3 are not damaged.

Next, the flatness of the air bearing surfaces of the floating magnetic heads of this embodiment and the conventional example after the gimbal 7 was attached was measured by a conventional method.

The results are shown in FIGS. 5 and 6. FIG. 5 shows the flatness of the air bearing surface of the floating magnetic head of this embodiment, and FIG. 6 shows the flatness of the air bearing surface of the conventional floating magnetic head.

As can be seen from FIG. 5, the flatness of the air bearing surface of the floating magnetic head of this embodiment is almost smooth;
As can be seen from FIG. 6, in the conventional floating magnetic head, a protrusion of about 90 nm was observed to be formed on the C-shaped core 1.

[0019]

[Effects of the Invention] As described above, the present invention provides an angle θ by machining or the like on a part of the gimbal mounting surface of the C-shaped core.
(0°<θ≦45°), so even if the gimbal deforms due to shrinkage of the adhesive resin, this deformation of the gimbal deforms the C-shaped core of the floating magnetic head. As a result, no protrusions are formed on the air bearing surface of the C-shaped core, and as a result, CSS
Even when the magnetic recording medium is moved, the surface of the magnetic recording medium or the gap portion is not damaged, the electromagnetic conversion characteristics of the magnetic head are significantly improved, and a floating magnetic head with excellent durability can be realized.

[Brief explanation of drawings]

[Fig. 1] A perspective view of a floating magnetic head of this embodiment.

[Figure 2]
A perspective view of the main parts of the floating magnetic head of this embodiment when it is mounted.

[Figure 3] Perspective view of a conventional floating magnetic head

[Figure 4] A perspective view of the main parts of a conventional floating magnetic head when it is mounted.

[Fig. 5] Flatness diagram of the air bearing surface of the floating magnetic head of this embodiment

[Figure 6] Flatness diagram of the air bearing surface of a conventional floating magnetic head

[Explanation of symbols]

1 C type core 2 Slider 3 Gap part 4 Bonded glass 5. Conventional floating magnetic head 6 Read/write coil wire 7. Gimbal 8. Adhesive 9 Load arm 10 Nails 11 Insulation tube 12 Magnetic recording medium 13　Slope surface

Claims (1)

[Claims] 1. A floating magnetic head comprising a C-shaped core and a slider joined to each other via a gap, and a gimbal joined to the upper surfaces of the C-shaped core and the slider,
A floating magnetic head characterized in that the gimbal facing surface of the mold core is formed as an inclined surface or a stepped portion having a predetermined angle.