JPH0660466A - Evaluating method for sliding surface of magnetic head of magnetooptical disk and evaluating device - Google Patents

Abstract

PURPOSE:To exactly analyze the behavior of friction and wear of a sliding surface at the time of sliding by continuously focusing on the sliding surface on which the magnetic head slides on a magnetooptical disk and observing the surface. CONSTITUTION:A magnetic head 3 slides on a surface on the side of the protection film of a magnetooptical disk 1 and a microscope main body 4 is arranged on the opposite side of the magnetic head 3 through the disk 1. A substrate coated with ultraviolet curing resin for protecting the disk 1 is used and a recording film is formed so that the light ray of the microscope is made to be transmitted through the substrate in order to observe the sliding surface of the disk 1. Thus, by continuously focusing on the sliding surface when the magnetic head 3 slides on the disk 1, the change of the sliding surface caused by wraping at the time of sliding is observed since the measuring part of the microscope is provided. Consequently, the analysis of the behevior of friction and wear of the disk 1 and the head 3 at the time of sliding is exactly performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an evaluating method and an evaluating apparatus for continuously focusing and observing a sliding surface on which a magnetic head slides on a magneto-optical disk.

[0002]

2. Description of the Related Art In a magneto-optical recording system, the temperature of a magnetic thin film is partially raised above a Curie point or a temperature compensation point, the coercive force of this portion is extinguished, and the direction of a recording magnetic field applied from the outside is increased. The basic principle is to reverse the direction of magnetization, and it is being put to practical use in an optical file system, an external storage device of a computer, a storage device of audio and video information, and the like.

A magneto-optical disk used in this magneto-optical recording system has an easy axis of magnetization in the direction perpendicular to the film surface on one main surface of a transparent substrate made of polycarbonate or the like and has a large magneto-optical effect. A recording portion is formed by laminating a recording magnetic layer (for example, a rare earth-transition metal alloy amorphous thin film), a reflection layer, and a dielectric layer, and a protective film made of an ultraviolet curable resin or the like is formed on the recording portion. What is formed is known.

By the way, the magneto-optical recording method is roughly classified into an optical modulation method and a magnetic field modulation method. Among them, the magnetic field modulation method has attracted attention because it can be overwritten. Adoption is being considered as a recording method for a compact magneto-optical disk (so-called mini disk) having a diameter of about 64 mm.

The above-mentioned magnetic field modulation method writes information in a magnetic thin film by reversing the applied magnetic field at a high speed, and the magnetic field is usually applied by a magnetic head having magnetic field generating means. In this case, a magnetic head that applies a high-speed reversal magnetic field can generate only a very small magnetic field due to various restrictions, and the magnetic head must be as close to the recording magnetic layer as possible.

Therefore, in such a magnetic field modulation system, adoption of a sliding recording system in which a magnetic head is brought into direct contact with the disk surface of a magneto-optical disk and recording is carried out while sliding is being considered. If this sliding recording method is adopted, a sufficient magnetic force can be applied to the recording magnetic layer even with the magnetic head that applies the high-speed reversal magnetic field. Moreover,
The head flying above the disk surface requires a complicated servo mechanism for keeping the distance between the disk surface and the head constant, but the sliding recording method requires such a servo mechanism. No mechanism is required. Therefore, it is also advantageous in simplifying and downsizing the device.

[0007]

In the sliding recording method as described above, since the magnetic head slides on the magneto-optical disk, the optical disk is designed and developed for the magneto-optical disk and the magnetic head. It is necessary to observe the sliding surface between the magnetic disk and the magnetic head and analyze the friction and wear behavior of the magneto-optical disk and the magnetic head. Therefore, after sliding the magneto-optical disk and the magnetic head for a fixed rotation, the magneto-optical disk and the magnetic head are removed from the sliding device, and the sliding surfaces of the magneto-optical disk and the magnetic head are observed under an optical microscope.

The above-described sliding device is, for example, a magneto-optical disk having a protective film formed thereon, a magnetic head sliding on the magneto-optical disk, a support for supporting the magnetic head, and a rotating magneto-optical disk. It is composed of a driving unit for driving. After sliding a predetermined number of rotations with the above-mentioned sliding device, the magneto-optical disk and the magnetic head were removed from the sliding device, and the change in the surface shape of the sliding portion was observed under an optical microscope. The frictional wear behavior of the magnetic head is analyzed.

On the other hand, the sliding surfaces of the magneto-optical disk and the magnetic head change due to changes in the environmental temperature during sliding, changes in the contact pressure caused by the warp of the magneto-optical disk, etc., which affects the behavior of the magnetic head. It seems that it is affecting. Therefore, it is necessary to continuously focus and observe the sliding surfaces of the magneto-optical disk and magnetic head during sliding in order to analyze the friction and wear behavior of the magneto-optical disk and magnetic head. I think that the.

Therefore, the present invention has been proposed in view of the conventional circumstances, and it is possible to continuously focus the sliding surface when the magnetic head slides on the magneto-optical disk for microscopic observation. It is an object of the present invention to provide an evaluation method and an evaluation device capable of

[0011]

In order to achieve the above-mentioned object, the evaluation method of the present invention is a microscope in which a sliding surface when a magnetic head slides on a magneto-optical disk is continuously focused. It is characterized by observing.

The evaluation device of the present invention comprises a magneto-optical disk, a magnetic head sliding on the magneto-optical disk, and an observation section for observing the sliding surface between the magneto-optical disk and the magnetic head with a microscope. It is characterized by that.

[0013]

In the sliding recording method used for the magneto-optical recording method, the magnetic head slides on the surface of the magneto-optical disk. Therefore, when designing and developing the magneto-optical disk and the magnetic head, It is necessary to analyze the friction and wear behavior, and after sliding the magneto-optical disk and the magnetic head at a specified number of rotations, remove the magneto-optical disk and the magnetic head from the sliding device and slide them under an optical microscope. By observing the change in the surface shape of the surface, the frictional wear behavior of the magneto-optical disk and magnetic head is analyzed.

However, the sliding surfaces of the magneto-optical disk and the magnetic head are subject to changes in environmental temperature during sliding, changes in contact pressure due to warpage of the magneto-optical disk, changes in friction surface roughness due to an increase in the number of times of friction, and the like. The state of has changed, and continuous observation of the sliding surface between the magneto-optical disk and the magnetic head during sliding is in order to analyze the friction and wear behavior of the magneto-optical disk and magnetic head. It seems necessary to. Further, in consideration of the warp of the magneto-optical disk, it is necessary to continuously observe with the microscope in focus.

In the evaluation method of the present invention, since the sliding surface between the magneto-optical disk and the magnetic head is continuously focused and observed under a microscope, the magneto-optical disk and the magnetic head during sliding are in contact with each other. It is possible to accurately analyze the friction and wear behavior.

Further, in the evaluation apparatus of the present invention, a magneto-optical disk and a magnetic head sliding on the magneto-optical disk,
Since the observation unit for observing the sliding surface between the magneto-optical disk and the magnetic head with a microscope is provided, the sliding surface between the magneto-optical disk and the magnetic head is continuously focused and observed in a contact state. Therefore, the friction and wear behavior of the magneto-optical disk and the magnetic head during sliding can be accurately analyzed. Furthermore, since the evaluation device of the present invention is provided with a light source that emits strobe light once for one rotation of the magneto-optical disk, observation at an arbitrary position of the magneto-optical disk can be continuously focused and microscopically observed. it can.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments to which the present invention is applied will be described below with reference to the drawings.

As shown in FIG. 1, the evaluation apparatus of this embodiment slides on a magneto-optical disk 1 rotating in the direction of arrow M1, a motor 2 rotating the magneto-optical disk 1, and a magneto-optical disk 1. Magnetic head 3, microscope body 4, support body 5 for supporting the microscope body 4, objective lens 6, CCD camera 7, VTR 8, monitor 9, strobe drive section 10, strobe light emission section 11, sync signal delay circuit 12, CCD It is configured by the camera drive unit 13. At this time, the surface of the magneto-optical disk 1 on the protective film side slides against the magnetic head 3, and the microscope body 4 is arranged on the opposite side of the magnetic head 3 with the magneto-optical disk 1 interposed therebetween. The magneto-optical disk 1 uses a transparent polycarbonate substrate coated with an ultraviolet curable resin as a protective film. Further, in order to observe the sliding surface of the magneto-optical disk 1, a recording film such as an MO film is not formed so that the light beam of the microscope is transmitted through the substrate.

As described above, the magneto-optical disk 1 rotates in the direction of the arrow M1 at a linear velocity of 1.4 m / sec, the magnetic head 3 placed at an arbitrary measurement position, and the protective film surface of the magneto-optical disk 1. Slides. From the motor 2 that rotates the magneto-optical disk 1, one pulse is generated in one rotation in synchronization with the rotation. This pulse is delayed by the synchronization signal delay circuit 12 for an arbitrary time, and then the above-mentioned delayed synchronization signal is applied to the flash drive unit 1.
0, and the strobe light emitting section 11 is caused to emit light. As described above, an image is taken by the CCD camera 7 once per rotation at an arbitrary position of the magneto-optical disk 1 and recorded on the VTR 8 via the monitor-9. Focusing of the microscope main body 4 is performed by moving the support 5 that supports the microscope main body 4 after the above-described rotation synchronization is adjusted.

In the present embodiment, the microscope body 4 was a TS-V manufactured by Chuo Seiki, and the support 5 supporting the microscope body 4 was a TS-O manufactured by Chuo Seiki. As the objective lens 6, 3 ×, 10 ×, and 20 × objective lenses manufactured by Chuo Seiki were used appropriately. The CCD camera 7 is a Sony XC-39, the strobe drive unit 10 is an MS-210 manufactured by Sugawara Laboratories, and the strobe light emission unit 1 is used.
As No. 1, SL-210M manufactured by Sugawara Laboratories was used.
Further, as the recording VTR 8, Sony-made SLV-R5 is used.
Was recorded for up to 9 hours.

Since the magneto-optical disk 1 uses a plastic substrate, the substrate is warped, and when observed under normal continuous microscope illumination, most of the areas are out of focus. However, if a mechanism for continuously observing only one place of the magneto-optical disk 1 within one rotation by strobe emission as in this embodiment is adopted, the sliding surface can be accurately observed in a focused state. You can do it.

[0022]

As is clear from the above description, in the evaluation method of the present invention, it is possible to continuously focus and observe the friction surface when the magnetic head slides on the magneto-optical disk. it can. Further, in the evaluation device of the present invention, since the friction surface when the magnetic head slides on the magneto-optical disk is equipped with a measuring unit for continuously focusing and observing with a microscope, the environmental temperature at the time of sliding It is possible to observe changes in the sliding surface of the magneto-optical disk and magnetic head due to changes in the contact pressure due to warping of the magneto-optical disk, and friction during sliding of the magneto-optical disk and magnetic head. The wear behavior can be accurately analyzed. The analysis of such frictional wear behavior of the magneto-optical disk and the magnetic head when sliding is very important in designing and developing the magneto-optical disk and the magnetic head, and has an extremely high industrial value.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of essential parts showing a configuration of an embodiment of an evaluation device to which the present invention is applied.

[Explanation of symbols]

 1 Magneto-optical disk 2 Motor 3 Magnetic head 4 Microscope main body 6 Objective lens 7 CCD camera 8 VTR 10 Strobe drive section 11 Strobe light emission section 12 Sync signal delay circuit

Claims (2)

[Claims] 1. A method of evaluating a magnetic head sliding surface of a magneto-optical disk, which comprises continuously observing a sliding surface on which a magnetic head slides on a magneto-optical disk. 2. An apparatus for evaluating a magnetic head sliding surface of a magneto-optical disk, comprising a measuring unit for continuously focusing and observing a sliding surface on which a magnetic head slides on a magneto-optical disk.