JPH0554579A - Modulated magnetic field generator - Google Patents

Abstract

PURPOSE:To evade wear and damage of a magnetic head slider or a photomagnetic recording medium, even if a floating force exerted on the magnetic head slider is decreased due to decrease in the relative number of revolution between the photomagnetic recording medium and magnetic head slider. CONSTITUTION:The magnetic head slider 2 is provided with a flat slider part having a slit 2a extending to the sliding direction at the center. A magnetic coil 4 and a core 5 are arranged on this slider part, then a generated magnetic field is modulated by the current supplied to the magnetic coil 4. This slider part is constituted of a lubricating graft polymer layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a flying type magnetic head in which a magnetic field generating core and a coil are arranged in a magnetic head slider made of a non-magnetic material, and a magnetic head slider is provided between the magnetic head slider and a magneto-optical recording medium. A magnetic field generator for use in a magnetic field modulation type magneto-optical recording / reproducing apparatus in which a magnetic head slider is levitated by an air flow generated in a magnetic field and a magnetic field having a polarity corresponding to recording information is applied to a magneto-optical recording medium by the magnetic head. Regarding

[0002]

2. Description of the Related Art Conventionally, there have been various overwritable magneto-optical recording / reproducing apparatuses for writing information on a recording medium by a magnetic field modulation method while irradiating a disk-shaped magneto-optical recording medium with a light beam. Proposed (Japanese Patent Laid-Open No. 51-
107121, JP-A-63-217548, JP-A-59-215008 and JP-B-60-48806). Here, in order to overwrite the magneto-optical recording medium, a magnetic coil and a core are provided in the magnetic head slider, and the magnetic coil and the core are provided so as to face the rotating magneto-optical recording medium, and a magnetic field occurs between the two. The magnetic head slider is levitated above the magneto-optical recording medium by the air flow. Therefore, the magnetic head slider is worn and damaged during the process of recording / reproducing / erasing by the magneto-optical recording / reproducing device due to the action of the air flow when the magneto-optical recording medium is rotating at a predetermined number of revolutions. There is no such thing.

[0003]

However, when the driving of the magneto-optical recording medium is started or ended, the relative rotational speed is lowered, so that the magnetic head slider loses its levitation force, and the magnetic head slider slides on the magneto-optical recording medium. As they come into contact with each other, there is a possibility that they may be worn and damaged, or that the magneto-optical recording medium side may be worn and damaged.

The object of the present invention is to reduce the relative rotational speed between the magneto-optical recording medium and the magnetic head slider,
It is an object of the present invention to provide a modulation magnetic field generation device capable of avoiding abrasion damage to a magnetic head slider or a magneto-optical recording medium even if the levitation force applied to the magnetic head slider is reduced.

[0005]

In order to achieve this object, the modulating magnetic field generating device of the present invention is provided with a lubricating graft polymerization layer in at least a portion of the magnetic head slider facing the magneto-optical recording medium. ..

[0006]

Therefore, even if the relative rotational speed between the magneto-optical recording medium and the magnetic head slider is reduced and the levitation force applied to the magnetic head slider is reduced, the contact between the magnetic head slider and the magneto-optical recording medium is reduced. It is possible to avoid wear damage due to.

[0007]

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

FIG. 1 is a perspective view of a main part of a modulating magnetic field generator according to an embodiment of the present invention, and FIGS. 2 and 3 are enlarged perspective views of a magnetic head slider 2 in FIG.

On the upper surface of a disk-shaped magneto-optical recording medium 1 driven by a spindle motor (not shown), a magnetic head slider 2 made of a polymeric material and made of a non-magnetic material is disposed so as to face it. This magnetic head slider 2 is elastically supported by a spring arm 3,
Further, as shown in FIG. 3, a flat slider portion having a slit 2a extending in the sliding direction at the center is provided. A magnetic coil 4 and a core 5 are arranged in this slider portion, and the generated magnetic field is modulated by the current supplied to the magnetic coil 4. In this embodiment, this slider portion is composed of a lubricious graft polymerization layer. For example, the entire magnetic head slider 2 including the slider portion may be composed of a graft polymerization layer having lubricity. As a specific example thereof, after molding the magnetic head slider 2 from a thermosetting resin, a thermoplastic resin, or a photocurable resin, a monomer having a functional group and having lubricity on its surface, for example, fluorinated. Graft polymerization of acrylate, fluorinated methacrylate, silicon acrylate, silicon methacrylate or the like is performed to form a graft polymerization layer. The effect of this embodiment by specifying the material in this way will be described from the result of the experiment. [Experimental Example 1] A polyimide resin is used as the material of the magnetic head slider 2, and a material obtained by graft-polymerizing a fluorinated acrylate on the polyimide resin is used. The polyimide resin uses diamine as a monomer, for example, 2,2′-bis (trimethyl) -4,4′-diaminobiphenyl, and acid dianhydride, for example, pyromellitic dianhydride. Here, the above two types of polyimide components are mixed at the monomer stage and used as a copolymer. Further, the magnetic head slider 2 formed of this resin is dipped in a fluorinated acrylate liquid and irradiated with UV light to form a fluorinated acrylate graft polymerization layer on the surface of the magnetic head slider 2.

A magnetic head slider 2 made of this material was subjected to a CSS test (CONTACT STARTSTOP, TEST) in 10
As a result of passing 10,000 times, the surface of the magneto-optical recording medium was not scratched, and no crash occurred on the magnetic head slider 2 side. [Experimental Example 2] As the material of the magnetic head slider 2, the same polyimide resin as in Experimental Example 1 was used, and a silicone acrylate graft polymerization layer was formed on the resin surface in the same manner as in Experimental Example 1 and used.

As a result of passing the magnetic head slider 2 made of this material 1 million times in the CSS test similar to the above, the magneto-optical recording medium surface is not damaged and no crash occurs on the magnetic head slider 2 side. It was [Experimental Example 3] Mn as a material of the magnetic head slider 2
-Zn ferrite was used, which was dipped in the polyimide copolymer solution used in Experimental Example 1 and then gently pulled up to form a polyimide layer on the surface, and then in the same manner as in Experimental Example 1, a polyimide layer was formed. A silicone acrylate graft polymerization layer was formed on the above and used.

As a result of passing the magnetic head slider 2 made of this material 1 million times in the CSS test similar to the above,
The surface of the magneto-optical recording medium was not scratched, and no crash occurred on the magnetic head slider 2 side. [Comparative Example] As a material of the magnetic head slider 2,
When a conventional material, that is, aluminum titanium carbide was used, the CSS test could not clear one million passes because of scratches on the surface of the magneto-optical recording medium.

[0013]

As described above, according to the present invention, a scratch is generated on the surface of the magneto-optical recording medium by providing the lubricating graft polymerization layer on at least the portion of the magnetic head slider facing the magneto-optical recording medium. Can avoid
Further, there is an effect that the head crash of the magnetic head slider itself can be avoided.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of a modulation magnetic field generation device according to an embodiment of the present invention.

FIG. 2 is a perspective view of a magnetic head slider 2 in FIG.

FIG. 3 is a perspective view of another example of the magnetic head slider 2 in FIG.

[Explanation of symbols]

 1 Magneto-optical recording medium 2 Magnetic head slider 2a Slit 3 Spring arm 4 Magnetic coil 5 Core

Claims (1)

[Claims] 1. A magnetic head slider made of a non-magnetic material, comprising a levitation type magnetic head in which a magnetic field generating core and a coil are arranged, and an air flow generated between the magnetic head slider and the magneto-optical recording medium. In a modulation magnetic field generator for floating the magnetic head slider and applying a magnetic field having a polarity corresponding to recording information to the magneto-optical recording medium by the magnetic head, at least facing the magneto-optical recording medium of the magnetic head slider. A modulated magnetic field generator characterized in that a lubricious graft polymerization layer is provided in a portion thereof.