JPH02226563A - High floating magnetic head - Google Patents

Abstract

PURPOSE:To prevent a disk from being damaged due to the contact of a magnetic head with the disk by holding a floating quantity at a constant large quantity by floating the magnetic head over a prescribed floating quantity by magnetic repulsion. CONSTITUTION:A magnetic field from the magnetic pole 9 for floating of the magnetic head 6 mounted at a pressurizing arm 7 is confronted with the direction of a magneto-optical recording layer 2 on a disk substrate 1, and the head 6 is floated at a range 10mum-50mum by the magnetic repulsion due to the magnetic field. Therefore, the floating quantity can be kept at the constant large quantity, and the disk can be prevented from being damaged due to the contact of the head with the disk, and recording and erasing operations, etc., can be stably performed.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a magnetic head used in a magneto-optical disk, and particularly relates to the refinement of a magnetic head that is suitable for override and stably maintains a high flying height. .

[Conventional technology]

Conventional magnetic heads for magneto-optical disks are of a self-levitation type that utilizes air pressure, and have a flying height of several μm or less.

As an example of this, for example, Japanese Patent Application Laid-Open No. 49-12151
There are 4 etc.

[Problem to be solved by the invention]

The above conventional technology has a small gap between the disk and the head, that is, a small flying height of the head, and slight external factors (vibration, etc.)
This often caused the head to collide with the disk substrate.

An object of the present invention is to increase the flying height of the head to 10 μm or more.

[Means to solve the problem]

In order to achieve the above object, the present invention.

By utilizing non-contact repulsive force, the gap between the disk and the magnetic head was increased to 10 μm or more. The concrete means for achieving this is to combine the repulsive force caused by the magnetic field of the magnetic head and the magnetic field generated from the magneto-optical recording film with the downward force of 2 g to 10 g from the pressure arm supporting the magnetic head. By balancing these, a high flying magnetic head with a distance between the disk and the head of 10 to 50 μm can be obtained.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a side view of a state in which information is being read and written on a magneto-optical disk using the high flying magnetic head of the present invention.

In the figure, there is a guide groove 4 (group) on the surface of the optical disk substrate 1 that guides the laser beam from the optical head 3.
A magneto-optical recording film 2 is formed thereon by a method such as sputtering, vacuum deposition, or CVD. Furthermore, a protective layer 5 is formed on this by spin coating or dipping. The material for this protective layer protects the recording film from sliding of the magnetic head, and is preferably hard, preferably having a pencil hardness of 4H or more. In this embodiment, an acrylic ultraviolet curing resin is spin-coated to a thickness of 5 μm to 10 μm or more and cured.

10 from the protective film to the tip of the pressure arm 7 on top of this protective layer.
A magnetic head 6 is mounted at a distance of more than μm, and while generating a signal-modulated magnetic field from the signal generating magnetic pole 8 of the magnetic head, the magnetic head is moved in the radial direction on the rotating protective film to achieve a predetermined position. After that, desired information is recorded and erased together with the optical head 3.

Here, magnetic repulsion is used as a method to levitate the magnetic head. The magnetic field from the magnetic field generating part 9 for levitation is
By opposing the direction of the magnetic field produced by the magneto-optical recording film 2, a magnetic repulsion force is generated and the magnetic head can be levitated from the optical disk.

Adjustment of this flying height is determined by the balance with the downward force from the pressure arm, and can be set to a desired value of 10 μm or more. In this example, the force of the pressure arm 7 was set to 5g. However, the flying height of the head is 30μ
I got m.

FIG. 2 is a diagram showing a second embodiment of the high-flying magnetic head of the present invention, in which the signal generating magnetic pole 8 and the floating magnetic field generating magnetic pole 9 interfere with each other, resulting in the magnitude of the magnetic field during recording or erasing. As a result, the repulsive force changes, causing unpredictable fluctuations in the flying height of the head. In order to prevent this, a magnetic shield 21 was installed between both magnetic poles to prevent interference between them.

Iron was used as the magnetic shielding material.

This has made it possible to stably write to and erase from magneto-optical disks. Here, similar effects can be obtained by using cobalt, nickel, or an alloy of these materials in addition to iron as the shielding material.

FIG. 3 shows another embodiment using the high flying magnetic head of the present invention. A metal film 10 made of aluminum or the like with a thickness of 1 μm was provided on the top of the magneto-optical disk used in the first embodiment.
1 is wound around the metal film 10, and when a high frequency current of IGHz or higher is passed through the metal film 10, an eddy current is generated in the metal film 10, and the magnetic field created by this eddy current and the magnetic field created by the levitation magnetic pole act as a repulsive force. A flying height of 100 μm can be obtained. Here, the resin layer 12 is for thermally separating the magneto-optical recording film 2 and the metal film 10, and is for not affecting the sensitivity of the recording film. Note that the magneto-optical recording film also includes a multilayer structure.

In the embodiments described above, a high-flying magnetic head that increases the distance between the magnetic head and the disk using a non-contact magnetic head is realized, but the invention is not limited to this, and electrostatic repulsion is used. However, this is a means that can be adopted in the present invention. In addition, although only the repulsive force was described in the embodiment, the distance between the magnetic head and the disk can be similarly increased by reversing the direction of the force of the pressure arm and using the attractive force. .

〔Effect of the invention〕

According to the present invention, the distance between the magnetic head and the disk can be increased, the head and disk will not come into contact and damage the disk, and the distance can always be kept constant, so recording, erasing, etc. I was able to perform the operation stably.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a system for recording information on a disk using the magnetic repulsion floating magnetic head of the present invention, FIG. 2 is a side view showing a second embodiment of the magnetic head of the present invention, and FIG. The figure is a side view showing a third embodiment of the magnetic head of the present invention. DESCRIPTION OF SYMBOLS 1... Optical disk substrate, 2... Magneto-optical recording film, 3...
... Optical head, 4... Guide groove, 5... Anti-sliding protective layer, 6... Magnetic head, 7... Pressure arm, 8...
Signal generation magnetic pole, 9... Magnetic pole for levitation, 10... Metal film, 11... Coil, 12... Resin layer, 21... Magnetic shielding.

Claims (1)

[Scope of Claims] 1. A magnetic head consisting of a magnetic pole that generates a magnetic field and a stand that supports it, in which the magnetic pole is supported by a stand that slides on the disk in a non-contact manner and is separated from the disk substrate by 10 μm or more. A high-flying magnetic head characterized by non-contact sliding. 2. High-flying magnetic head according to claim 1, characterized in that electrostatic repulsion or attractive force is used as a means for making the stand supporting the magnetic head and the disk non-contact. head. 3. A high-flying magnetic head according to claim 1, characterized in that magnetic repulsion or attraction is used as a means for making the stand supporting the magnetic head and the disk non-contact. 4. A high flying magnetic head according to claims 1 and 3, characterized in that a magnetic shield is provided between the signal corresponding magnetic field generating magnetic pole and the levitation magnetic field generating magnetic pole of the magnetic head. magnetic head. 5. In the high flying magnetic head according to claims 1, 3, and 4, iron (Fe) is used as the magnetic shielding material.
), nickel (Ni), cobalt (Co), or an alloy of two or more of these.