JPH06131738A - Magnetic head for magneto-optical recording - Google Patents

Abstract

PURPOSE:To prevent the damage of a disk and to reduce the weight of a slider by constituting this slider of a resin material. CONSTITUTION:The slider 37 is formed of the engineering plastic material which consists of 'Teflon(R)', polyacetal, etc., as a base material and is reformed by adding carbon, inorg. particles, such as SiO2, fibers, etc., thereto. A gimbal mounting hole 40 packed with an adhesive reinforcing material 39 at its center is provided. A head body 41 is constituted by winding a coil 43 around a central magnetic material 42a of a core 42. The damages of the disk 1 and the slider 37 are decreased by this constitution even if the slider 37 erroneously comes into contact with the surface of the disk 1. The reliability of the recording is improved and the weight of the slider 37 is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magneto-optical recording magnetic head which floats on a magneto-optical recording medium (hereinafter referred to as a disk) and moves in the radial direction to perform magneto-optical recording on the disk.

[0002]

2. Description of the Related Art One of the so-called writable optical disks capable of writing, erasing and reading information using a light beam is called a magneto-optical disk as a magneto-optical recording medium.

As shown in FIG. 10, this disk 1 is provided with a magneto-optical recording layer 4 made of a perpendicularly magnetized film on a transparent substrate 2 with a SiN protective film 3 interposed therebetween.
A reflective film 6 made of a metal thin film, for example, an Al thin film is laminated via an N protective film 5, and a protective film 7 made of an ultraviolet curable resin or the like is further formed on the reflective film 6.

As a method of recording information on the disc 1,
A magnetic field modulation method, an optical modulation method, etc. are known. The magnetic field modulation method enables so-called overwriting in which a new signal is overwritten on an old signal. In this magnetic field modulation type magneto-optical recording, as shown in FIG. 11, an optical pickup for irradiating the laser beam 11 is arranged on the substrate 2 side of the disk 1 having a magneto-optical recording layer of a perpendicular magnetization film, and a protective film 7 is provided.
A head element 13 having a magnetic core 13a around which a coil 12 is wound is disposed on the side, a laser spot 11a of a laser beam 11 emitted from an optical pickup is positioned near the center line of the head element 13, and a current is passed through the coil 12. The direction of the magnetic field emitted from the head element 13 is changed by changing the direction of.

The disk 1 is rotated at a predetermined rotation speed with the center thereof as the center of rotation. Then, a magnetic field corresponding to the recording signal is formed in the vicinity of the laser spot 11a, so that the desired rewriting portion 1a of the disk 1 is heated to a Curie temperature or higher by the laser spot 11a and demagnetized. After that, the rewritten desired portion 1a is the laser spot 1
When the magnetic recording medium moves from 1a and falls below the Curie temperature, it is magnetized in the magnetic field direction for recording.

The head element 13 is housed in a slider, and is housed in a head body having a sliding portion and a flying type magnetic head which floats above the disk 1 with a predetermined gap, and directly through the sliding portion. There is a sliding type magnetic head that slides in contact with the disk 1. The present invention relates to the former flying type magnetic head. The slider has been made of ceramics such as calcium titanate (CaTiO ₃ ), alumina carbide (Al ₂ O ₃ TiC), and non-magnetic ferrite, similar to the slider used in the conventional hard disk drive (HDD).

[0007]

However, when a slider made of ceramics is used for the disk 1 used in a magneto-optical drive (MOD), sticking or scratching of the disk 1 is likely to occur. there were. Further, in the flying height of the slider and its allowance, the surface roughness of the disk 1 and the slider, the HDD
And MOD have the following differences.

HDD MOD Flying height <0.1 μm Several μm Same allowable width ± 10% ± 50% Disk surface roughness <100 nm to 1 μm Slider surface roughness <100 nm to 1 μm

That is, in the MOD, the dimensional accuracy may be much lower than that of the HDD, and the use of the ceramics high precision grinding material has a problem that it can be said to be excessive quality.

The present invention has been made in view of the above circumstances, and provides a magneto-optical recording magnetic head having a lightweight and inexpensive slider which is not damaged even if the slider accidentally contacts the disk surface. The purpose is to provide.

[0011]

A magnetic head for magneto-optical recording according to claim 1, which floats on a disk 1 as a magneto-optical recording medium which is rotationally driven by a motor 21 and moves in the radial direction. In the magnetic head for magneto-optical recording which performs magneto-optical recording in No. 1, the slider 37 which supports and moves the head 41 is made of a resin material.

In the magnetic head for magneto-optical recording according to a second aspect of the present invention, the resin material is an engineering plastic material containing at least one of Teflon, polyacetal, polyethylene, polyamide and polyimide as a main material.

[0013]

In the magnetic head for magneto-optical recording having the above construction, since the slider 37 is made of a resin material, even if the slider 37 accidentally contacts the disk 1, the hardness of the slider 37 is small and the disk 1 is almost damaged. Don't give. In addition, a slider shape whose floating property can be improved can be easily obtained by the die molding process, and mass production is possible and the cost is reduced. Moreover, the specific gravity of the resin material is 1 g / cc to 2 g / cc, which is smaller than that of the ceramic material having a specific gravity of 4.2 g / cc to 5 g / cc, and the weight of the slider can be reduced.

[0014]

An embodiment of a magnetic head for magneto-optical recording of the present invention will be described below with reference to the drawings.

1 to 7 show the construction of an example of a magneto-optical recording apparatus equipped with a head of an embodiment of the present invention. 1 to 3, the magneto-optical disk 1 is rotationally driven by a spindle motor 21. The base end of the optical pickup 22 is fixed to a base portion 23 provided in the lower portion of the disc 1, and a 45 degree reflection mirror 24 and a lens 25 are provided at the tip. The base portion 23 is slidably guided by a guide bar 26 fixed to the apparatus main body,
The motor 27 is rotationally driven, and coarse tracking feed is performed by a feed screw 28 provided in parallel with the guide bar 26. The optical axis of the lens 25 is perpendicular to the surface of the disk 1, and this optical axis moves along the radius of the disk 1 by the rough tracking feed.

In the light receiving / emitting section 29 of the optical pickup 22,
A light emitting element 30, a light receiving element 31, a flat plate reflection mirror 32, a polarization beam splitter 33, and a 45 degree reflection mirror 34 are provided. The light emitted from the light emitting element 30 passes through the polarization beam splitter 33, is reflected by the reflection mirror 34, is further reflected by the reflection mirror 24, and is focused on the surface of the disc 1 by the lens 25. Further, the light reflected from the disk 1 travels in the same optical path in the opposite direction, is reflected by the polarization beam splitter 33 and the flat plate mirror 32, and enters the light receiving element 31. The optical path of the light reflected by the reflection mirror 34 is located on the radius of the disk 1. Further, the optical pickup 22 is provided with a focus servo mechanism (not shown).

A base end of an arm portion 35 is fixed to the base portion 23, and the arm portion 35 is arranged above the disc 1 in parallel with the optical pickup 22. Arm 35
As shown in FIGS. 4 and 5, a slider 37 is attached to the tip of the via a gimbal 36.

The slider 37 is made of Teflon, polyacetal (POM), polyethylene, polyamide, polyimide, etc. as a base material, and is made into an approximately rectangular plate shape by an engineering plastic material obtained by adding and modifying carbon, inorganic particles such as SiO ₂ and fibers. Has been formed. At the center, as shown in FIGS. 6 and 7, a gimbal mounting hole 40 filled with the adhesive reinforcing material 39 is provided. Also,
On the slider 37, a head body 41 is arranged near the edge on the side of the disk running direction A and shifted toward the outer peripheral side of the disk 1. The head main body 41 has a coil 43 wound around a central magnet 42 a of a vase-shaped core 42 having an E-shaped cross section. Further, the slider 37 is provided with a recess (not shown) for generating a suction force, and a tapered surface 37a for generating a floating force.

Next, the operation of this embodiment will be described. The magnetic field center of the head body 41 and the disk 1 of the optical pickup 22
The fine adjustment of the alignment with the center of the optical axis for irradiating is performed by adjusting the angle of the reflection mirror 34. Further, the optical pickup 22 and the head main body 41 are integrally connected via the arm 35 and the base portion 23, and move in conjunction with the radial direction of the disk 1 by the rotation of the motor 27. The size of the magnetic poles is set so that the required recording magnetic field Hy can be applied even if the positional deviation of the head body 41 occurs.

When the rotation of the disk 1 is stopped,
The recording center of the optical pickup 22 and the head main body 41 stands by at a position deviated from the outer peripheral portion of the disk 1, and the arm 35 can safely avoid contact with the surface of the disk 1 by a sliding liner not shown. Distance, eg 0.2
It's about mm. The optical pickup 22 and the head main body 41 are moved to the signal track position on the disk 1 as needed, but at this time, the flying force of the slider 37 does not contact the disk 1. In addition, disk 1
When the rotation of the disk 1 is stopped, the optical pickup 22 and the head main body 41 are retracted out of the surface of the disk 1 before the rotation is stopped. As another method, a method may be considered in which, regardless of the position of the head main body 41 on the disk 1, the head main body 41 is separated from the surface of the disk 1 by spring pressure when stopped, and the slider 37 is attracted toward and floated when restarted. .

According to this embodiment, since the slider 37 is made of the engineering plastic material, even if the slider 37 accidentally contacts the surface of the disk 1, the disk 1
Also, the slider 37 is less likely to be damaged, and the reliability of recording can be improved. In addition, scratching powder is less likely to drop during contact, and contact noise is low. Further, a slider shape capable of improving the flying characteristics can be easily obtained by the die molding process, mass production becomes possible, and the cost can be reduced. Moreover, the specific gravity of the resin material is 1 g / cc to 2 g / cc, and the specific gravity is 4.2 g / cc.
It is smaller than the ceramic material of 5 to 5 g / cc, and the weight of the slider 37 can be reduced.

In the above embodiment, the case where the core 42 is a pot type has been described, but as shown in FIG.
A ring core 42b may be concentrically provided around the center magnetic pole 42a of the core 42. Further, a core having a shape with a small demagnetizing field such as a T type or a U type is used.

[0023]

As described above, according to the magnetic head for magneto-optical recording of the present invention, since the slider supporting the head body is made of the engineering plastic material, both of them are erroneously contacted with the disk. The occurrence of damage can be almost eliminated, and the reliability of recording can be improved. Further, it is possible to easily obtain a shape that improves the flying characteristics of the slider, and it is possible to make the slider lightweight and inexpensive.

[Brief description of drawings]

FIG. 1 is a plan view showing the configuration of an example of a magneto-optical recording device equipped with an embodiment of a magnetic head for magneto-optical recording of the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is a side view of FIG.

FIG. 4 is a side view showing the configuration of the arm shown in FIG.

FIG. 5 is a plan view of FIG.

6 is a side view showing the configuration of the slider shown in FIG.

FIG. 7 is a plan view of FIG.

FIG. 8 is a side view showing the structure of a slider according to another embodiment of the present invention.

9 is a plan view of FIG. 8. FIG.

FIG. 10 is a cross-sectional view showing an example of the structure of a magneto-optical disk.

FIG. 11 is an explanatory diagram of a magnetic field modulation method.

[Simple explanation of symbols]

 1 Magneto-optical disk (magneto-optical recording medium) 21 Motor 37 Slider 41 Head

Claims (2)

[Claims] 1. A magnetic head for magneto-optical recording, which floats on a magneto-optical recording medium rotationally driven by a motor and moves in a radial direction to perform magneto-optical recording on the magneto-optical recording medium, the head being supported. A magnetic head for magneto-optical recording, characterized in that a slider that moves in a vertical direction is made of a resin material. 2. The magnetic head for magneto-optical recording according to claim 1, wherein the resin material is an engineering plastic material containing at least one of Teflon, polyacetal, polyethylene, polyamide and polyimide as a main material.