JPH05120824A - Floating type magnetic head - Google Patents

Abstract

PURPOSE:To obviate the deterioration in the flatness of rails for floating of the floating type magnetic head for recording and reproducing signals to and from a magnetic recording medium, thereby preventing the deterioration in CSS characteristics and improving electromagnetic conversion characteristics. CONSTITUTION:A fine groove 9 is formed on an outer wall 8 on the lower surface 1c side of a slider 1 forming a coil groove 3. As a result, the strength of the outside wall 8 of the coil groove 3 on the rear surface 1c side of the slider 1 is weakened and the stresses acting on the outside wall at the time of coil winding are concentrated to the rear surface 1c side of the slider 1, by which the deterioration in the flatness of the rails 2 for floating on the front surface 1a side of the slider 1 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 used for a fixed type magnetic disk for high density recording.

[0002]

2. Description of the Related Art In recent years, the recording capacity of one recording medium has been reduced to 40 while the recording medium has been miniaturized from 5.25 inches to 2.5 inches with the miniaturization of fixed type magnetic disk devices. It has a large capacity of about megabytes. Further, the number of media tends to increase in the trend of thinning, and the magnetic head is inevitably required to be thin, and the total height of the magnetic head is about 0.6 to 0.86 mm. In this case, the requirement for the flatness of the levitation rail is strict, and this requirement is inevitable in order to reduce the levitation amount for high density recording.

A conventional floating magnetic head will be described below. As shown in FIG. 4, a pair of levitation rails 2 are formed on the upper surface 1a of the slider 1 made of a non-magnetic material such as ceramics, that is, on the surface facing the magnetic recording medium.
A coil groove 3 for winding the recording / reproducing coil is formed on one end surface of the slider 1 in the longitudinal direction, that is, the trailing surface 1b. Further, a metal oxide magnetic core (hereinafter referred to as a core chip) 5 is arranged in a slit portion 4 provided at the center of the rail width of the levitation rail 2, and the core chip 5 and the inner surface of the slit portion 4 are made of low melting glass. Then, the core chip 5 is fixed to the inside of the slit portion 4 by fusion to form a floating magnetic head. 6 in the figure is a glass fusion part.

As another conventional example, as shown in FIG.
The coil groove 3a is formed in a triangular shape and the reinforcing member 7 is provided in a part of the coil groove 3a, or the reinforcing member 7 is integrally formed with the slider 1 to form the coil groove 3a in only a part. There is one having such a configuration (see, for example, JP-A-63-87606).

As another conventional example, as shown in FIG. 6, when the coil groove 3b is formed, the outer wall on the lower surface side of the slider 1 is not formed, but the outer wall is formed only on the upper surface 1a side. (Eg, US Pat. No. 4870).
520).

[0006]

However, in the above-described conventional structure, as the magnetic head becomes smaller, the upper surface 1a of the slider 1 is wound when the recording / reproducing coil is wound.
The outer wall at the formation position of the coil groove 3 on the side jumps up to the upper surface 1a side, and the flatness of the levitation rail on which the core chip 5 is disposed deteriorates, thereby increasing the contact friction with the magnetic recording medium. Therefore, there is a problem that the CSS characteristics are deteriorated. This problem does not occur in the type except the outer wall on the lower surface side of the slider 1 of the coil groove 3 as in the conventional example described in FIG. 6, but in this type,
There is a problem that the winding shape changes after the winding of the coil due to the stress applied, and a defect is likely to occur during the winding work.

The present invention solves the above-mentioned problems of the prior art by eliminating the deterioration of the flatness of the levitation rail, preventing the deterioration of CSS characteristics, and winding the recording / reproducing coil close to the gap. An object of the present invention is to provide a floating magnetic head having improved efficiency and improved electromagnetic conversion characteristics.

[0008]

In order to achieve this object, a floating magnetic head of the present invention has a lower surface of a slider at a position of a groove for coil winding, and a parallel type to a bottom surface of the groove for coil winding. The structure is provided with a narrow groove having a width dimension of 1 mm or less, or a structure in which the narrow groove is filled with a reinforcing resin.

[0009]

With this structure, the strength of the outer wall on which the coil groove on the lower surface side of the slider is formed is weakened, so that the stress acting on the outer wall of the coil groove from inside the coil groove when the coil is wound causes the coil groove on the lower surface side of the slider. Concentrates on the outer wall of the slider and does not easily act on the outer wall of the coil groove on the upper surface side of the slider, so that the flatness of the levitation rail does not deteriorate.

[0010]

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

In FIGS. 1 to 3 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 FIG. 1, a narrow groove 9 having a width dimension of 1 mm or less is formed parallel to the bottom surface of the coil groove 3 on a part of the outer wall 8 of the coil groove 3 on the lower surface 1c side of the slider 1. Form. The depth dimension of the narrow groove 9 is a predetermined dimension according to the thickness d of the outer wall 8 of the coil groove 3.

The method for forming the fine groove 9 includes mechanical processing using a grindstone, laser processing using a laser, and the like. Although the formation of the narrow groove 9 may weaken the strength of the outer wall 8 of the coil groove 3 on the lower surface 1c side of the slider 1, the narrow groove 9 may be reinforced by filling it with resin or the like. However, the reinforcing resin used has a sufficiently low viscosity after curing.

As described above, according to this embodiment, by forming the narrow groove 9, the coil groove 3 generated when the recording / reproducing coil 11 is wound as shown in FIG. 2 is intended to be widened. Since the stress in the directions indicated by arrows A and B is concentrated on the outer wall 8 of the coil groove 3 on the lower surface 1c side where the narrow groove 9 of the slider 1 is formed, the coil groove 3 on the upper surface 1a side of the slider 1 is concentrated.
Arrow A that pushes up the outer wall of the slider to the upper surface 1a side of the slider 1.
The stress in the direction indicated by is reduced, and the flatness of the levitation rail 2 can be prevented from deterioration.

In terms of electromagnetic conversion characteristics, the thickness h of the outer wall of the coil groove 3 on the upper surface 1a side of the slider 1 can be made as thin as possible, so that the recording / reproducing coil 11 of the core chip 5 can be formed. Since it can be wound closer to the gap, the magnetic efficiency can be improved and the electromagnetic conversion characteristics can be improved.

Further, if the narrow groove 9 is filled with resin, the shape of the levitation rail 2 can be adjusted by utilizing the contraction thereof, and the levitation rail 2 can be made convex.

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

As shown in FIG. 3, the difference from the configuration of FIG. 1 is that the rectangular coil groove 3 is a triangular coil groove 3a, and the narrow groove 9 is formed parallel to the bottom surface of the coil groove 3a. This is the point that the narrow groove 10 is provided.

Since the effect of this embodiment is the same as that of the first embodiment, its explanation is omitted.

[0020]

As is apparent from the above description of the embodiments, the present invention has a width formed on the lower surface of the slider at the position of the groove for coil winding parallel to the bottom surface of the groove for coil winding. The structure with fine grooves with a size of 1 mm or less and the structure in which the fine grooves are filled with reinforcing resin eliminates the deterioration of the flatness of the levitation rail, prevents the deterioration of CSS characteristics, and creates a coil gap for recording and reproduction. An excellent floating magnetic head that can be wound close to each other and that has improved magnetic efficiency and improved electromagnetic conversion characteristics can be realized.

[Brief description of drawings]

FIG. 1 is an external perspective view of a slider of a floating magnetic head according to a first embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view showing the concept of the main part of the floating magnetic head.

FIG. 3 is an external perspective view of a slider of a floating magnetic head according to a second embodiment of the present invention.

FIG. 4 is an external perspective view of a slider of a conventional floating magnetic head.

FIG. 5 is an external perspective view of a slider of another conventional floating magnetic head.

FIG. 6 is an external perspective view of a slider of still another conventional floating magnetic head.

[Explanation of symbols]

 1 Slider 1c Lower surface 3 Coil groove 8 Outer wall 9 Fine groove

Claims (2)

[Claims] 1. A recording is formed by forming a slit portion and a coil groove for winding a recording / reproducing coil in a part of a slider made of a non-magnetic material and having a flying rail on a surface facing a magnetic recording medium. A composite type floating magnetic element fixed in the slit portion by arranging a metal oxide magnetic material core integrated with a gap of a predetermined size for reproduction in the slit portion of the slider and fusing with glass. A head, which is formed on the lower surface of the slider at the position of the groove for coil winding with respect to the slider surface on the side facing the magnetic recording medium, parallel to the bottom surface of the groove for coil winding. A floating magnetic head with a narrow groove with a width of 1 mm or less. 2. The floating magnetic head according to claim 1, wherein the narrow groove has a filled resin.