JPH03232172A - Floating type magnetic head - Google Patents

Abstract

PURPOSE:To obtain a large floating force and to attain the stable floating state without use of a highly accurate machine tool by providing a slot forming partially a thin film layer on a bottom face of a slider section so as to provide a shallow slot easily. CONSTITUTION:The head consists mainly of a slider section 1 receiving a floating pressure and a coil section 2 with a lead wire 3 wound thereon, thin film layers 4, 4 made of a fluorinated resin whose thickness is 5mum is formed onto both ends of a bottom face of the slider section 1 symmetrically to the center line thereby forming a slot 5 with an equal depth than the thickness of the thin film layer 4 to a center of a bottom face with no thin film layer 4 formed thereon. In this case, the shallow slot 5 is easily provided on the bottom face of the slider section 1 by making the thickness of the thin film layer 4 thin. Thus, a large floating force is acquired and the stable floating state is realized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a floating magnetic head used in a magnetic recording/reproducing device such as a magneto-optical disk device.

[Prior Art] When performing high-speed data recording by override in a magneto-optical disk device, the magnetic field modulation recording method is most effective, but for this purpose, it is necessary to efficiently apply a high-speed reversal magnetic field to the magneto-optical disk. It uses a floating magnetic head, which has a proven track record in hard disk drives.

As shown in FIG. 2, a floating magnetic head for a hard disk drive mainly consists of a slider section 1 that receives floating pressure and a coil section 2 around which a conducting wire 3 is wound. When the magnetic disk is rotated at high speed, the floating magnetic head receives an upward force (floating blade) due to the airflow flowing between the slider section 1 and the magnetic disk, causing it to levitate above the magnetic disk. The flying height is determined by the balance with the downward force from the suspension, and is usually on the order of submicrons. Further, a groove 5 having a depth D of 200 to 300 μm is provided in the center of the bottom surface of the slider portion 1, and the floating blade is divided into left and right sides to stabilize the floating state.

[Problem to be solved by the invention]

Incidentally, in a device such as a magneto-optical disk device in which disks can be replaced, a flying height of 5 μm or more is usually required to avoid head crashes due to adhesion of dust or the like.

Table 1 shows the floating blade and groove 5 when the floating height is 5 μm.
It shows the relationship between depth D. The floating magnetic head used in the measurement has a length L of 6 as shown in FIG.
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 as the depth D of the groove 5 is increased, the number of floating blades decreases rapidly and sharply, and the number of floating blades increases in proportion to the relative speed (2) between the floating magnetic head and the magnetic disk. It can be seen that if the depth D of the groove 5 is set to 10 to 50 μm, the number of floating blades does not decrease significantly, and the floating blades are divided into left and right sides, and stable floating is performed.

However, in the conventional configuration described above, the groove 5 is located in the slider portion 1.
Since it is formed by mechanically processing the bottom surface of the groove 5, it is possible to precisely machine the depth D of the groove 5 to about 10 μm, but it requires a highly accurate machine tool.
There is also the problem that manufacturing management is difficult.

[Means to solve the problem]

In order to solve the above problems, the floating magnetic head of the present invention is a floating magnetic head in which a groove for stabilizing the flying state is provided on the bottom surface of the slider section, and the groove is formed by partially forming a thin film on the bottom surface of the slider section. It is characterized in that it is provided by forming layers.

[For production]

According to the above configuration, the grooves are provided by partially forming a thin film layer on the bottom surface of the slider portion, so that shallow grooves can be easily provided by reducing the thickness of the thin film layer.

As a result, it is possible to easily manufacture a flying magnetic head that provides a large flying blade and achieves a stable flying state.

〔Example〕

FIG. 1 shows one embodiment of the present invention, and is a perspective view showing a schematic configuration of a floating magnetic head used in a magneto-optical disk device. Note that members having the same functions as those shown in the drawings of the conventional example are given the same reference numerals.

The floating magnetic head of the present invention mainly comprises a slider section 1 that receives floating pressure and a coil section 2 around which a conducting wire 3 is wound. A thickness of 5 μm is provided at both ends of the bottom surface of the slider section 1.
Thin film layers 4 made of fluororesin are formed symmetrically, thereby creating a groove 5 having a depth equal to the thickness of the thin film layer 4 at the center of the bottom surface where the thin film layer 4 is not formed. It looks like this. Therefore, by reducing the thickness of the thin film layer 4, the 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, after masking the part of the bottom surface of the slider part 1 that will become the groove 5 and applying liquid fluororesin to the entire bottom surface by a spraying method or dipping method, it is applied by a predetermined method such as UV irradiation, heating, or drying. Formed by curing.

For the thin film layer 4, any resin other than fluororesin may be used as long as it has excellent lubricating properties. As a guideline for the lubrication properties, 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, a lubricant such as perfluoropolyether may be applied after forming the thin film layer 4.
It can be used if the lubrication properties are improved.

Further, the thin film layer 4 may be made of an inorganic material such as SiO□ or carbon. When forming the thin film layer 4 of Sin, masking is performed in the same manner as described above, and an alcoholic solution of tetrahydroxysilane is applied to the entire bottom surface, followed by drying and baking. In addition, when forming the carbon thin film layer 4, after masking, sputtering method, vapor deposition method, CV
The film is formed by the D method or the like. Note that when using these inorganic materials, it is desirable to apply a lubricant after forming the thin film layer 4 in order to improve the lubricating properties.

In the magneto-optical disk device equipped with the above-mentioned floating magnetic head, when the magneto-optical disk is rotated at high speed, the airflow flowing between the slider section 1 and the magneto-optical disk causes the floating magnetic head to be moved by an upward force (floating blade ) and floats above the magneto-optical disk. Then, at a position where the flying height reaches approximately 5 μm, the floating blade becomes balanced with the downward force exerted by the suspension. At this time, the floating blade is divided into left and right sides by the groove 5, and a stable floating state is obtained.

When recording information, a laser beam of a certain amount of light is irradiated onto the magneto-optical disk to heat the magnetic film to a temperature above the Curie point or near the compensation point, and the coercive force of the laser beam irradiated area is reduced to zero or almost zero. Then, by flowing a magnetic field setting current that rapidly reverses in response to the recording signal through the conductor 3 of the coil section 2, a high-speed reverse magnetic field can be efficiently applied and high-speed data recording by override can be performed. .

In the above embodiments, a floating magnetic head provided in a magneto-optical disk device has been described, but the present invention can also be applied to floating magnetic heads in other disk-exchangeable magnetic recording devices.

〔Effect of the invention〕

As described above, in the floating magnetic head of the present invention, the grooves are formed by partially forming a thin film layer on the bottom surface of the slider portion. will be provided. As a result, it is possible to easily manufacture a floating magnetic head' which can obtain a large floating blade without using a high-precision machine tool, and which can achieve a stable floating state by dividing the floating blade into left and right sides.

[Brief explanation of drawings]

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

Claims (1)

[Claims] 1. In a floating magnetic head in which a groove for stabilizing the floating state is provided on the bottom surface of the slider portion, the groove is provided by partially forming a thin film layer on the bottom surface of the slider portion. A floating magnetic head characterized by: