JP2945429B2 - Flying magnetic head - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flying magnetic head used in a magnetic recording / reproducing device such as a magneto-optical disk device.

[Related Art] When performing high-speed data recording by overwriting in a magneto-optical disk device, the magnetic field modulation recording method is the most promising. For this purpose, a high-speed reversal magnetic field is applied to the magneto-optical disk efficiently. It is necessary to employ a floating magnetic head that has been used in hard disk devices.

As shown in FIG. 2, the floating magnetic head of the hard disk drive mainly includes a slider portion 1 for receiving a floating pressure and a coil portion 2 around which a conductive wire 3 is wound. When the magnetic disk is rotated at a high speed, an airflow flowing between the slider unit 1 and the magnetic disk causes the flying magnetic head to receive an upward force (flying force) and fly above the magnetic disk. The flying height is determined by the balance with the downward force of the suspension, and is usually on the order of submicron. Further, a groove 5 having a depth D of 200 to 300 μm is provided at the center of the bottom surface of the slider portion 1 so that the floating force is divided into right and left to stabilize the floating state.

[Problems to be solved by the invention]

By the way, in a device such as a magneto-optical disk device which can exchange a disk, a flying height of 5 μm or more is usually required in order to avoid a head crash due to dust or the like.

Table 1 shows the relationship between the lifting force and the depth D of the groove 5 when the flying height is 5 μm. The flying magnetic head used for the measurement had a length L as shown in FIG.
The width B is 6 mm, the width B is 4 mm, and the width G of the groove 5 is 0.5 mm. From this table, it can be seen that when the depth D of the groove 5 is increased, the levitation force decreases rapidly, and the levitation force increases in proportion to the relative speed V between the levitation type magnetic head and the magnetic disk. When the depth D of the groove 5 is set to 5 to 50 μm, the levitation force does not greatly decrease, and the levitation force is divided into right and left, so that stable levitation is performed.

However, in the above-described conventional configuration, since the groove 5 is formed by mechanically processing the bottom surface of the slider portion 1, it is possible to accurately process the depth D of the groove 5 to about 10 μm. However, there is a problem that a high-precision machine tool is required and the production management is also difficult.

[Means for solving the problem]

In order to solve the above-mentioned problems, the floating magnetic head of the present invention has a groove for stabilizing a floating state provided in a central vertical section which vertically traverses the bottom surface of the slider section, and the air flow between the slider section and the disk causes In the flying magnetic head for a magneto-optical disk device, the groove is formed by a resin thin film layer provided on both sides of the central longitudinal section on the bottom surface of the slider portion,
The groove depth is 5 to 50 μm.

[Action]

According to the above configuration, the same thickness (5 to 50 μm) as the thin film layer is formed by forming the thin film layer on the bottom surface of the slider portion.
Since the above-mentioned grooves are formed, a large floating force can be obtained, and a floating magnetic head capable of realizing a stable floating state can be easily manufactured.

〔Example〕

FIG. 1, showing an embodiment of the present invention, is a perspective view showing a schematic configuration of a floating magnetic head used in a magneto-optical disk drive. Members having the same functions as the members shown in the drawings of the conventional example are denoted by the same reference numerals.

The flying magnetic head of the present invention mainly comprises a slider portion 1 receiving a floating pressure and a coil portion 2 around which a conductive wire 3 is wound. 5μ thickness at both ends of the bottom of slider part 1
m, a thin film tank 4 made of a fluorine-based resin is formed symmetrically, so that a groove 5 having a depth equal to the thickness of the thin film layer 4 is formed in the central vertical section where the thin film layer 4 is not formed. It is made to be made. Therefore, the thin film layer 4
By reducing the thickness of the slider 1, a shallow groove 5 can be easily provided on the bottom surface of the slider portion 1.

The thin film layer 4 is formed as follows. That is, a portion which becomes the groove 5 on the bottom surface of the slider portion 1 is masked, and a liquid fluorine-based resin is applied to the entire bottom surface by a spraying method or a dipping method, and then is irradiated by a predetermined method such as UV irradiation, heating or drying. It is formed by curing.

The thin film layer 4 is not limited to a fluorine-based resin as long as it has excellent lubrication properties, and any resin may be used. As a standard of the lubrication characteristics, it is sufficient that the coefficient of static friction between the resin and the disk surface is 1 or less. Even if the resin has poor lubricating properties, it can be used if the lubricant such as perfluoropolyether is applied after forming the thin film layer 4 to improve the lubricating properties.

In the magneto-optical disk device having the above-mentioned floating magnetic head, when the magneto-optical disk is rotated at a high speed, the airflow flowing between the slider unit 1 and the magneto-optical disk causes
The floating magnetic head flies above the magneto-optical disk by receiving an upward force (flying force). Then, at the position where the flying height is about 5 μm, the floating force balances with the downward force of the suspension. At this time, the levitation force is divided right and left by the groove 5, and a stable levitation state is obtained.

At the time of information recording, a constant amount of laser beam is irradiated on the magneto-optical disk to heat the temperature of the magnetic film above the Curie point or near the compensation point, and the coercive force of the laser beam irradiation part becomes zero or almost zero. Then, a high-speed reversal magnetic field can be efficiently applied by flowing a magnetic field setting current that performs high-speed reversal in accordance with a recording signal to the conductor 3 of the coil unit 2 to perform high-speed data recording by overwriting. .

In the above embodiment, the floating magnetic head provided in the magneto-optical disk device has been described. However, the present invention can be applied to other floating magnetic heads such as a disk-replaceable magnetic recording device.

〔The invention's effect〕

As described above, the floating magnetic head of the present invention is formed by dividing a thin film layer made of resin and having a film thickness of 5 to 50 μm on the bottom surface of the slider portion into right and left portions, thereby obtaining the same thickness (5 mm) as the thin film layer. 5050 μm) grooves, so that a large levitation force can be obtained without using a high-precision machine tool, and the levitation force is divided into left and right to achieve a stable levitation state. The head can be easily manufactured.

[Brief description of the drawings]

FIG. 1, showing an embodiment of the present invention, is a perspective view showing a schematic configuration of a flying magnetic head. FIG. 2 shows a conventional example, and is a perspective view showing a schematic configuration of a floating magnetic head for a hard disk drive. 1 is a slider part, 2 is a coil part, 3 is a conductor, 4 is a thin film layer, and 5 is a groove.

 ──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Kenji Ota 22-22 Nagaike-cho, Abeno-ku, Osaka-shi, Osaka Inside Sharp Corporation (56) References JP-A-56-25229 (JP, A) JP-A-57- 44257 (JP, A) JP-A-61-120329 (JP, A) JP-A-56-47956 (JP, A) JP-A-62-9957 (JP, A) JP-A-61-77163 (JP, A) JP-A-1-236412 (JP, A)

Claims (1)

(57) [Claims] 1. A magneto-optical disk device, wherein a groove for stabilizing a floating state is provided in a central longitudinal section which vertically crosses a bottom surface of a slider portion, and the groove floats on the disk by an air flow between the slider portion and the disk. In the floating magnetic head for use, the groove is formed by a resin thin film layer provided on both sides of the center longitudinal section on the bottom surface of the slider portion,
A floating magnetic head having a groove depth of 5 to 50 μm.