JPH04121847A - Magneto-optical disk device - Google Patents

Abstract

PURPOSE:To deal with a magneto-optical disk requiring an erasing process and also a magneto-optical disk corresponding to a magnetic field modulation overwrite by giving selectively a magnetic field from a 1st magnetic field generator or a 2nd magnetic field generator to the magneto-optical disk based on a decision of discriminating the kind of magneto-optical disk. CONSTITUTION:A means for giving a magnetic field to the magneto-optical disk 1 is provided with the 1st magnetic field generator 14 for generating a magnetic field in a recording signal frequency band and having a structure capable of floating and sliding above the magneto-optical disk due to the aerodynamic effect and the 2nd magnetic field generator 24 capable of generating a DC magnetic field of both poles N and S, whereas the generators 14 and 24 are fitted to a driving means capable of moving parallel with the magneto-optical disk 1, and is equipped with a vertical moving means to enable the 1st magnetic field generator 14 to come into contact with the magneto-optical disk 1 on its surface. Consequently, by selectively using the generators 14 and 24 in accordance with the kinds of magneto-optical disks 1, not only the magneto-optical disk 1 corresponding to the magnetic field modulation overwrite but also the conventional magneto-optical disk 1 requiring the erasing process are recorded and reproduced and then erased.

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD The present invention relates to a magneto-optical disk/device that is capable of both overriding a magneto-optical disk using a magnetic field modulation override method and recording, reproducing and erasing data on a magneto-optical disk that required a conventional erasing process. Related to conventional technology Magneto-optical disk devices that record information signals at high density are being used.This generally uses an alloy of rare earths and transition metals as a recording medium, and requires three processes: erasing, recording, and reproducing. Although a magneto-optical disk device capable of overriding using a magnetic field modulation method has been considered, the recording of the conventional magneto-optical disk device described above will be explained below with reference to the drawings.
The figure shows a schematic diagram of a conventional magneto-optical disk device (conventional example 1) that requires the three processes of erasing, recording, and reproduction. Even if the magneto-optical recording layer 3 is formed by a thin film forming method such as sputtering, 4 is a magnetic field generator made of a magnet or an electromagnet, 5 is a laser beam, and 6 is an objective lens for focusing the laser beam 5. The operation of the conventional magneto-optical disk and its recording method constructed as above will be explained below. When the magneto-optical recording layer 3 is heated to a temperature close to the Curie temperature or higher by applying a magnetic field to the magneto-optical disk using the magnetic field generator 4 and using the laser beam 5 focused by the objective lens 6, the magneto-optical recording layer 3 is cooled down. Even though the recording process is achieved by fixing the magnetization according to the direction of the magnetic field, in reality the laser beam 5 is an on-off signal modulated by the recording signal. To erase a recording medium written in this way, 41, that is, to align the direction of magnetization of the magneto-optical recording layer 3 in one direction, 4
The regeneration process can be achieved by inverting the magnetic field of the magnetic field generator and irradiating it with a continuous laser beam 5.
In the case of the above-mentioned magneto-optical disk device, when rewriting, a continuous laser beam is irradiated with an intensity of several minutes lower than that of recording, and the Kerr rotation angle of the reflected light changes depending on the direction of magnetization. , it is necessary to erase previously written information before recording. Therefore, even though it takes a lot of time to record information, override technology is currently being actively researched to eliminate this drawback. One method is called the magnetic field modulation method, and it was proposed in Japanese Patent Publication No. 60-48806. However, this magnetic field modulation method is also used in magneto-optical disk drives for data files. Although a device capable of recording data at high speed using a generating means (flying magnetic head) has been proposed, the following description will be made with reference to FIG. Explanation about records Part 7
In the figure, reference numeral 7 denotes a magneto-optical disk compatible with magnetic field modulation override, in which a magneto-optical recording layer 3 is formed on a substrate 2 by a thin film forming method such as sputtering. Even if a special overcoat layer 8 is provided on the magnetic disk, 5 is a laser beam, and 6 is an objective lens X9 for focusing the laser beam 5, which is a flying magnetic head.
IO is a magnetic head current drive circuit. When the magneto-optical disk is stopped, the flying magnetic head 9 and the magneto-optical disk 7 are in contact, and when the magneto-optical disk is rotating, it floats a few μm above the special overcoat layer 8. Even if a contact start/stop (C3S) method is used, recording is performed by heating the magneto-optical recording layer 3 to near the Curie temperature with a continuously emitted laser beam 5, and at the same time modulating the magnetic head 9 with a flying magnetic head 9 near the heated part. When a magnetic field is applied, the heated magneto-optical recording layer 3 reverses its magnetization according to the direction of the modulated magnetic field, and when the magneto-optical recording layer 3 is cooled, the direction of magnetization is fixed and recorded as information. When information is already written on the recording track and rewriting is performed, the magneto-optical recording layer must be heated.The previous information disappears at the same time as the writing, and even if the information is overwritten and rewritten with new information, the invention has tried to solve the problem. However, in the magneto-optical disk device of Conventional Example 1 mentioned above (
1) When recording, an erasing process is required to erase previous information, and of course there is no override function.On the other hand, the magneto-optical disk drive of Conventional Example 2 supports overrides, but due to the C8S, a special override function is required. It is necessary to use a coated magneto-optical disk (℃) The one currently being commercialized is Conventional Example 1,
Conventional example 2, which can be overridden as the next generation, is in the development stage.In this case, the problem is that the magneto-optical disk of conventional example 1 did not have a special overcoat for C8S compatibility. This means that it cannot be used with the next-generation model in Example 2. In the case of data files, information written on the previous generation model (conventional example 1) is transferred to the next generation model (
It is important to be able to read and write in Conventional Example 2), and it is desired that the magneto-optical disk for Conventional Example 1 can also be used in the apparatus of Conventional Example 2. The purpose of the present invention is to provide a magneto-optical disk device that can perform conventional recording, reproducing and erasing on magneto-optical disks that have been modified, and that can perform override using magnetic field modulation for magneto-optical disks that are compatible with magnetic field modulation override. Means for Solving In order to solve the above problems, the magneto-optical disk device of the present invention generates a magnetic field in the recording signal frequency band as a means for applying a magnetic field to the magneto-optical disk, and levitates and slides on the magneto-optical disk using an aerodynamic effect. A first magnetic field generator having a structure to obtain N, which does not come into contact with the magneto-optical disk,
and a second magnetic field generator capable of generating a DC magnetic field with S polarity. Both magnetic field generators are attached to a drive means that can be moved in a direction parallel to the magneto-optical disk, and the first magnetic field generator is connected to the magneto-optical disk. The magnetic field from the first magnetic field generator or the second magnetic field generator may be selectively applied to the magneto-optical disk by determining the type of the magneto-optical disk. As a means for applying a magnetic field to a magneto-optical disk or a magneto-optical disk, there is provided a first magnetic field generating section capable of generating a magnetic field in the recording signal frequency band, and a second magnetic field capable of generating a direct current magnetic field of both N and S polarities. The magnetic field generator has a structure that allows the magnetic field generator to levitate and glide above the magneto-optical disk using an aerodynamic effect, and the magnetic field generator can also be moved in a direction parallel to the magneto-optical disk. The magneto-optical disc type may be determined by determining the type of the magneto-optical disc, so that the magnetic field from the first magnetic field generating unit or the second magnetic field generating unit is This is a function that can be applied selectively to the magneto-optical disk.
Determine whether or not the magneto-optical disk is compatible with magnetic field modulation. , a magnetic field generator having a second magnetic field generator comes into contact with the surface of the magneto-optical disk by means of a vertical drive means, and levitates and slides as the magneto-optical disk rotates. By the means, the laser beam of the optical head is moved onto the heated recording track of the magneto-optical recording layer, and overriding is performed by the modulated magnetic field from the first magnetic field generator or the first magnetic field generating section. In the case of a conventional magneto-optical disk that requires a second magnetic field generator or a magnetic field generator that has both a first and second magnetic field generator, do not contact the surface of the magneto-optical disk. The magnetic field required for erasing and recording is raised by the second magnetic field generation a.
Alternatively, if the second magnetic field generator or the second magnetic field generator is an electromagnet, the magnetic field from the second magnetic field generator is used to transfer the data to the desired track using a transfer means parallel to the magneto-optical disk. Even if the current polarity is switched by recording, the second magnetic field generator or the second magnetic field generator is N,
In the case of a permanent magnet with both S poles, in order to obtain the required magnetic field polarity at the time of erasing or recording, a transfer driving means in a direction parallel to the magneto-optical disk is used to force the N pole or S pole to be used for erasing or recording. Embodiment Hereinafter, a magneto-optical disk device according to an embodiment of the present invention will be described.
I will explain while referring to the drawings.

Embodiment 1 FIGS. 1(a) and 1(b) show a plan view and a side view of the basic configuration of a magneto-optical disk device according to Embodiment 1 of the present invention. ), (d) are partial cross sections showing the structure of the magneto-optical disk @ Figures 2 and 3 a, b
, c are a perspective view and a schematic diagram for explaining the first magnetic field generator and the second magnetic field generator, respectively.
) (b) (c) (d) or the second one is in each figure of Fig. 3, 1 is the magneto-optical disk layer, 2 is the substrate, 3 is the magneto-optical recording layer (HtI) is a normal overcoat layer, and 8 is a special overcoat layer. In the case of magneto-optical disks that require the erasing process described in Conventional Example 1, an ultraviolet curing resin is generally used for the overcoat layer.On the other hand, in magneto-optical disks that support magnetic field modulation overwriting, which are compatible with C8S, ultraviolet curing resin is used in the overcoat layer. Resin mixed with abrasive and lubricant or D
Although thin films such as LC (diamond-like carbon) are used, in actual magneto-optical disks there are other layers in addition to these layers to adjust the sensitivity, increase the Kerr rotation angle, or increase the weather resistance of the magneto-optical disk. These layers are omitted in the drawing. 4 Next, 12 is the spindle mortar, 6 is the objective lens 7S of the optical head (not shown), 5 is the laser beam input, and 13 is its The condensing spot 14 is a first magnetic field generator that generates a magnetic field in the recording signal frequency band and has a structure that allows it to levitate and glide above the magneto-optical disk by an aerodynamic effect. Fig. 2 is a perspective view of its detailed structure. This is also an example of a monolithic type in which part of the slider and the magnetic circuit are made of the same magnetic material. In the same figure, 15 is the slider section 1 for floating and sliding on the magneto-optical disk by the aerodynamic effect.
6 is carp 7k17 is magnetic gap, 18 is 1 magnetic K
19 is a magnetic field; 20 is a load beam for supporting the first magnetic field generator and for bringing this magnetic field generator into contact with the magneto-optical disk 1; its end is connected to the transfer driver 22 via a leaf spring 21; Even if the structure is such that it is connected to the movable part 23 and can change the inclination angle of the load beam 20 with respect to the movable part 23, the second part 24 can generate a DC magnetic field with both N and S poles.
This second magnetic field generator 24 is the third magnetic field generator.
The permanent magnet shown in Figure A is the single-pole DC electromagnet shown in Figure 3, or the U-shaped DC electromagnet with two poles facing the magneto-optical disk surface as shown in Figure 3C. In each of figures a, b, and c, 25 is N,
Permanent magnet with S magnetic poles 26 is a magnetic core 2
7 is the carp At, L is the distance between the magnetic poles, and 28 is the second
This is a rigid support arm that supports the second magnetic field generator, and is also connected to the movable part 23 of the transfer drive 22. By moving it in a direction parallel to the magneto-optical disk, or by moving it and switching the current polarity of the electromagnet, it is possible to apply an N or S magnetic field to any track on the magneto-optical disk.
(i) The second magnetic field generator 24 supported by the support arm 28 is always kept at a constant distance from the magneto-optical disk. 29 is the fixed part of the transfer driver 22. The transfer driver 22 is a linear stepping motor.
can be slid relative to the fixed part 29, and the first or second magnetic field generator 14.24 can be moved from the innermost track position to the outermost track position of the magneto-optical disk 1.
Reference numeral 30 denotes a load beam support arm joined to the load beam 20, which applies a force for raising and lowering the load beam 20 by the movement of a magnetic field generator raising and lowering plate 32 that rotates in the direction shown by the arrow 31, that is, the first magnetic field generator 14. The operation of the magneto-optical disk device configured as described above will be explained below. Alternatively, at the mounting stage, it is determined whether the magneto-optical disk 1 is the type of magneto-optical disk of the conventional example 1 which requires an erasing process or the magneto-optical disk of the conventional example 2 which supports magnetic field modulation override. When it is determined that it is a magneto-optical disk of the type of conventional example 1, it is determined based on the identifier (for example, the presence or absence of a specially provided identification recess in the cartridge case), etc. However, the first magnetic field generator 14 does not come into contact with the magneto-optical disk 1 (
t For this magneto-optical disk, the first magnetic field generator 1
4 is not used, but the second magnetic field generator 24 is used.
The gap between the magnetic field generator 24 and the magneto-optical disk 1 is 1 mm.
To some extent, the second magnetic field generator 24 may be able to obtain a sufficient magnetic field for recording and erasing information on the magneto-optical disk.
If the magneto-optical disk device is a data file device, it is generally recorded when the magneto-optical disk 1 enters a steady rotation state.
The controller built into the magneto-optical disk device performs a series of initial operations to prepare the disk for playback and erasure. Then any n
The operation of the objective lens 6 of the optical head and the movable part 23 of the transport driver 22 will be explained in the case where the th track is accessed and the track is played back or recorded. Due to the movement of the optical head itself (however, the means for moving the optical head is not shown) and the minute movement of the objective lens 6, the focused spot 13 of the laser beam 5 does not access the n-th track. Even if No. 4H is reproduced, when recording or erasing the track, the focused spot 13 of the laser beam 5 accesses the nth track in the same way as during reproduction.
At the same time, by driving the transfer driver 22, the second magnetic field generator 24 moves to the vicinity of the n-th track.The second magnetic field generator 24 is a permanent magnet having two N and S poles as shown in FIG. In the case of a type, the position where the magnetic field from the N pole is applied during recording (the case where the magnetic field from the N pole is applied to the magneto-optical disk is called the N magnetic field, and is assumed to be the magnetic field during recording, but the magnetic field during erasing is the S magnetic field) In addition, in the case of erasing, the transfer driver 22 drives the second magnetic field generator 24 to the position where the magnetic field from the S pole is applied.In other words, during recording and erasing, the transfer driver 22 drives the second magnetic field generator 24 by the distance between the magnetic poles. Although the movable part 23 of the driver 22 moves in the radial direction of the magneto-optical disk 1 and the setting position changes, during recording, the laser modulated by the recording signal is applied to the magneto-optical disk 1 under the above N magnetic field state. Even if the beam 5 heats the magneto-optical recording layer 3 and a signal is written, during erasing, the continuous laser beam 5 heats the magneto-optical recording layer 3 continuously under the S magnetic field application state, and even if erasing is performed, recording and erasing are performed alternately. , the focused spot 13 of the objective lens 6 remains on the same track due to the force (transfer drive 2
The movable part 23 of No. 2 moves back and forth and alternately applies N, S magnetic fields to the magneto-optical disk 1. In the case of the single-pole DC electromagnet type shown in FIG. When the magneto-optical disk 1 is moved near the track and the polarity of the coil current is switched, a necessary magnetic field of hN or S is applied to the magneto-optical disk 1. Furthermore, as shown in FIG. In the case of There is a method of obtaining the required magnetic field LN or S by moving the movable part 23 of the transfer drive 22 in the radial direction of the magneto-optical disk.Of course, this is possible depending on the design of the device. When it is determined that the next mounted magneto-optical disk 1 is a magneto-optical disk compatible with the magnetic field modulation override of conventional example 2 (the magnetic field generator raising/lowering plate 32 rotates a), the load beam support arm 30 is raised accordingly. Although the state is released and the first magnetic field generator 14 comes into contact with the special overcoat 8 of the magneto-optical disk l, the second magnetic field generator 24 is not used for this magneto-optical disk, and the first magnetic field generator 14 When using the magnetic field generator 14a, the first magnetic field generator 14 has a magnetic circuit structure that can generate a magnetic field in the recording signal frequency band, that is, even if the inductance is designed to be several μH or less.
Next, the magneto-optical disk 1 starts rotating and the slider part 15
Although it starts sliding on the magneto-optical disk, it ends when the rotational speed of the magneto-optical disk exceeds a certain value.When the magneto-optical disk enters a levitation sliding state due to the aerodynamic effect and the magneto-optical disk enters a steady rotation state, it enters a stable levitation gliding state. Status As mentioned above, the built-in controller of the magneto-optical disk unit performs a series of initial operations.
When reproducing or overriding an arbitrary n-th track, the operation of the optical head is the same as described above. However, in the case of override, the laser beam 5 is a continuous beam. When override is performed on the nth track, a recording magnetic field modulated by a signal is applied to the magneto-optical disk 1! M. The main magnetic pole 18 of the first magnetic field generator 14 moves to the vicinity of the n-th track by driving the transfer driver 22. The modulation signal current is supplied to the coil 16, and a magnetic field 19 corresponding to the modulation signal is generated and override is performed. Next, we will discuss the operation of the transfer driver 22 during regeneration.
Broadly speaking, during reproduction, the first and second magnetic field generators 14 and 24 are always located at the same set position on the magneto-optical disk when driving the transport driver 22 according to the reproduction track. In the former case, the driving distance of the transfer driver 22 is relatively short when moving from the playback state to the recording, erasing, or override state, and in the latter case, the power consumption during playback can be reduced. In addition to this, various cases can be considered regarding how to set the position of the first and second magnetic field generators 14 and 24 after erasing or overriding the playback state or layout. (In addition, recording is often performed on a track in the vicinity of the track.) After recording, the transport driver 22 may not be moved from that position for a while. In any case, the movement mode of the magnetic field generator is determined by the design policy of the magneto-optical disk device. As described above, according to this embodiment, a magnetic field in the recording signal frequency band is generated as a means for applying a magnetic field to a magneto-optical disk, and the structure is capable of levitating and sliding on the magneto-optical disk by an aerodynamic effect. and a second magnetic field generator capable of generating a direct current magnetic field having both poles of N and S without contact with the magneto-optical disk, and a second magnetic field generator capable of generating a direct current magnetic field with both poles of N and S, and which does not come into contact with the magneto-optical disk. The first magnetic field generator is selectively moved according to the type of the magneto-optical disk by means of a drive means capable of transporting both magnetic field generators to the surface of the magneto-optical disk, and a vertical drive means capable of bringing the first magnetic field generator into contact with the surface of the magneto-optical disk. By using the device of this embodiment, it is possible to distribute, reproduce, and erase not only magneto-optical disks compatible with magnetic field modulation override, but also conventional magneto-optical disks that required an erasing process. [Example 2] 4(a) and 4(b) show a plan view and a side view of the basic configuration of a magneto-optical disk device according to a second embodiment of the present invention, and FIG. 5 shows a magnetic field generation used in this embodiment. 4. In each of the figures of FIG. 4 and FIG. 6 is an objective lens X of an optical head (not shown), 5 is a laser beam A, 13 is its focused spot, 33 is a first magnetic field generating section capable of generating a magnetic field in the recording signal frequency band, and N and S poles. This magnetic field generator has a structure that allows it to levitate and glide above a magneto-optical disk using an aerodynamic effect. show. Part of the slider is a composite type that uses non-magnetic material.
A slider part 34 for floating and sliding on the magneto-optical disk by an aerodynamic effect, a first magnetic field generating part 35 for generating a magnetic field in the recording signal frequency band, and a second magnetic field generating part 35 for generating a DC magnetic field with both N and S poles. The first magnetic field generating section 35 has a magnetic circuit configuration that can generate a magnetic field in the recording signal frequency band, that is, the magnetic circuit is designed to have an inductance of several μH or less, It is composed of a first magnetic core 40 having a first coil 37, a first magnetic pole 38, and a second magnetic pole 39, and a first magnetic gap 41. , a second magnetic core 46 having a third magnetic pole 44 and a fourth magnetic pole 45, and a second magnetic gap 47. A module 20 that generates a magnetic field 48 supports a magnetic field generator 33 and generates a magnetic field on the magneto-optical disk 1. It is a load beam for abutting the generator 33. Its end is attached to the leaf spring 21.
29 is a fixed part of the transfer driver 22. Even if the structure is such that the inclination angle of the load beam 20 can be changed with respect to the movable part 23, 29 is a fixed part of the transfer driver 22. On the other hand, the movable part 23 can move with respect to the magneto-optical disc in the same manner as in the first embodiment & 30 is a load beam support arm 3 joined to the load beam 20
Reference numeral 2 denotes a magnetic field generator raising/lowering plate, whose function is the same as that of the first embodiment.
The operation of the second embodiment configured as above in that the magnetic field generation means for the recording signal frequency band and the DC magnetic field generation means are integrated will be explained below. Although we will omit the same part as in Embodiment 1, first of all, the type of magneto-optical disk 1 is determined by the same means as in Embodiment 1 at the time when magneto-optical disk 1 is installed in this magneto-optical disk device or during the installation stage. If it is determined that the magneto-optical disk is of the type 1, the magnetic field generator raising/lowering plate 32 will keep the load beam support arm 30 raised, but the magnetic field generator 33 will not come into contact with the magneto-optical disk 1 ( ~ For this magneto-optical disk, a magnetic field generator 33
The first magnetic field generating section 35 is not used, and the second magnetic field generating section 36 is
However, when the magneto-optical disk 1 has no surface runout, the distance between the magnetic field generator 33 and the magneto-optical disk 1 should always be maintained at a constant distance.Actually, taking into account the surface runout of the magneto-optical disk, it is about 1 mm. Place the load beam 2 so that there is a gap.
Raise 0. As described in the first embodiment, the controller built into the magneto-optical disk device performs a series of initial operations. Next, an arbitrary n-th track is accessed, and the access of the optical head when recording or reproducing that track is the same as in Example 1.a When recording or erasing, the access of the optical head is the same as the access of the optical head. Then, by driving the transfer driver 22, the third magnetic pole 44 of the magnetic field generator 33 is moved to the vicinity of the n-th track.The third magnetic pole 44 becomes the S magnetic pole for recording and the S magnetic pole for erasing. The current polarity of 43 is switched, and recording is performed with a laser beam 5 modulated by a recording signal under the application of a magnetic field 48, or erasing is performed with a continuous laser beam 5. In the above case, only the third magnetic pole 44 is used.1. This is a method of obtaining N and S magnetic fields by switching the current polarity of the X and second coils 43.
There is a method of using the third magnetic pole 44 for recording without switching the current polarity of the second coil 43 and using the fourth magnetic pole 45 for erasing. The third magnetic pole 4 is placed near the Lnth track when moving forward and backward.
Furthermore, in the above case, the second magnetic field generating section 35 uses an electromagnet, but a permanent magnet having both N and S poles is arranged in the second magnetic core. In this case, it is necessary to move the movable part 23 of the transport driver 22 back and forth to erase the record, which is the same as in the first embodiment. If the disk is determined to be a magneto-optical disk that supports magnetic field modulation override (2),
The magnetic field generator raising/lowering plate 32 rotates, and the magnetic field generator 33 comes into contact with the special overcoat layer of the magneto-optical disk 1.
For this magneto-optical disk, the second magnetic field generation section 36 is not used, but the first magnetic field generation section 35 is used. When the magneto-optical disk 1 rotates, the slider part 34 slides on the magneto-optical disk 1. When it reaches a steady rotation state, it enters a stable flying and sliding state.A When override is performed on the n-th track, the transfer driver 22 is used to apply a recording magnetic field modulated by a signal to the magneto-optical disk 1. Even if the first magnetic pole 38 of the magnetic field generator 33 is moved to the vicinity of the n-th track by the drive of Alternatively, the operation of the transfer driver 22 after override can be determined based on the design policy of the magneto-optical disk device of the first embodiment. As described above, according to this embodiment, as means for applying a magnetic field to the magneto-optical disk, there is a first magnetic field generating section that can generate a magnetic field in the recording signal frequency band, and a second magnetic field generating section that can generate a DC magnetic field with both N and S polarities. This magnetic field generator has a magnetic field generator that also has a magnetic field generating section 2, and has a structure that allows this magnetic field generator to levitate and glide over the magneto-optical disk by an aerodynamic effect, and furthermore, this magnetic field generator has a structure that allows it to levitate and glide above the magneto-optical disk. The magnetic field generator is attached to a drive means that can be moved in parallel directions, and further has a magnetic field generator vertical drive means that can come into contact with the surface of the magneto-optical disk. By using the device of this embodiment, it is possible to erase not only magneto-optical disks compatible with magnetic field modulation override, but also conventional magneto-optical disks that required an erasing process. In the case where the first magnetic field generating part and the second magnetic field generating part are integrated, the dimensions of the entire magnetic field generator can be made smaller compared to Example 1, and it can easily fit into the window of the cartridge case. Also, since the first magnetic field generating section and the second magnetic field generating section are integrated, the movable range of the transfer driver is shorter than that of the first embodiment.It is smaller than the transfer driver of the first embodiment. 4. Effects of the Invention The magneto-optical disk device ('!) of the present invention generates a magnetic field in the recording signal frequency band as a means for applying a magnetic field to the magneto-optical disk, and levitates and slides on the magneto-optical disk using an aerodynamic effect. a first magnetic field generator that can generate a direct current magnetic field with both N and S polarities, and both magnetic field generators can be moved in a direction parallel to the magneto-optical disk. Even if the first magnetic field generator is attached to a drive means and has a vertical drive means capable of bringing the first magnetic field generator into contact with the surface of the magneto-optical disk, both magnetic field generators can be used selectively depending on the type of the magneto-optical disk. Not only magneto-optical disks that support modulation override, but also conventional magneto-optical disks that required an erasing process can be erased. a first magnetic field generating section capable of generating a magnetic field;
It has a magnetic field generator that also has a second magnetic field generator that can generate a DC magnetic field with both N and S poles, and has a structure that allows this magnetic field generator to levitate and glide over the magneto-optical disk by an aerodynamic effect. Moreover, this magnetic field generator is attached to a drive means that can be moved in a direction parallel to the magneto-optical disk, and further has a vertical drive means that can come into contact with the surface of the magneto-optical disk. (6) The magneto-optical disk device of the present invention can be used selectively depending on the type of magnetic disk.The magneto-optical disk device of the present invention can perform power distribution, re-erasing, and erasing not only magneto-optical disks compatible with magnetic field modulation override, but also conventional magneto-optical disks that require an erasing process. Furthermore, since the first magnetic field generator and the second magnetic field generator are integrated, the overall size of the magnetic field generator can be reduced, and it can easily fit into the window of the cartridge case. In addition, since the first magnetic field generating section and the second magnetic field generating section are integrated, the movable range of the transfer driver can be shortened, and the transfer driver can be made smaller.

[Brief explanation of drawings]

FIGS. 1(a) and 1(b) are a plan view and a side view of the basic configuration of a magneto-optical disk device according to the first embodiment of the present invention. FIG. 2 is a perspective view of the first magnetic field generator used in Example 1. FIGS. 3A and 3B are partial cross-sectional views. C is a schematic diagram showing an example of the second magnetic field generator. FIG. 4(a)
, (b) is a plan view and a side view of the basic configuration of the magneto-optical disk device according to the second embodiment of the present invention. FIG. 5 is a perspective view of the magnetic field generator used in the second embodiment. FIG. 6 is a conventional erasing process. Figure M7 is a schematic diagram of a magneto-optical disk device that uses a conventional magnetic field modulation method override.
...Substrate, 3...Magneto-optical recording screen 4...
・Magnetic field generator 5...Laser beam 80...
...Objective lens
10...Magnetic head current drive cycle 11...
... Normal overcoat J112 ... Spindle Mokyu 13 ... Focusing spot, 14 ...
....First magnetic field generator 15...Slider area 16...Carp/1417...Magnetic gap, 18...Main gun [i, 19・
...Magnetic field 20...Loadbee! 2
1...Plate board 22...Transfer drive device
23...Movable part 24...Second magnetic field generator 25...Permanent magnet 26...
Magnetic core 27...Carp/lz, L...
・・・・Distance between magnetic poles [28... Support ah! ,,
29...Fixed clothing 30...Load beam support arm 31...Arrow FX 32...
...Magnetic field generator up/down slope 33...Magnetic field generator 34...Slider clothes 35...
First field generating suit 36...Second magnetic field generator
37... 1st carp/38... - 1st magnetic maple 39... 2nd magnetic maple 40... 1st
Magnetic core, 41...First magnetic gear 42
...Magnetic field 43...Second carp) I<4
4... Third magnetic pole 45... Fourth magnetic maple 4
6...Second magnetic core 47...Second magnetic gap, 48...Name of Magnetic agent Patent attorney Akira Okaji and two others Magnetic field generator o-g beam shock beam transfer M shift 5 Moving part 2 Cicada supporting frame fixed part 0-dope beam 7-m (C) (d) da I5- slide 16- coil 11 -1-a air gap 18- main a% rq ---a fathom π-load beam part 0 . 5- Elongated pole stone 26- Magnetic fur 27--Film 28-Support arm (C) (b) Roto beam writer-1st magnetic R emitting gβ 2 side field generating part*1 Coil Rin IF&- 2nd iB, f! No. J Genki Fur'II Sparrow Milk Cap Kai 2 Coil 2 Magnetic Teffer N2 Kise Tsubu Kaede Kai

Claims (4)

[Claims] (1) As a means for applying a magnetic field to the magneto-optical disk, a first magnetic field generator that generates a magnetic field in the recording signal frequency band and has a structure that allows the magneto-optical disk to levitate and glide on the disk due to an aerodynamic effect; and a magneto-optical disk. N, S who have no contact with
and a second magnetic field generator capable of generating a bipolar DC magnetic field, both magnetic field generators are attached to a drive means that can be moved in a direction parallel to the magneto-optical disk, and the first magnetic field generator is A magneto-optical disk device equipped with a vertical drive means that can come into contact with a magnetic disk surface. (2) Claim 1, characterized in that the magnetic field from the first magnetic field generator or the second magnetic field generator is selectively applied to the magneto-optical disk by determining the magneto-optical disk type. magneto-optical disk device. (3) As a means for applying a magnetic field to the magneto-optical disk, a first magnetic field generating section that can generate a magnetic field in the recording signal frequency band and a second magnetic field generating section that can generate a DC magnetic field with both N and S poles are used. The magnetic field generator has a structure in which the magnetic field generator can levitate and glide above the magneto-optical disk by an aerodynamic effect, and the magnetic field generator is equipped with a driving means that can move the magneto-optical disk in a direction parallel to the disk. 1. A magneto-optical disk device, which is attached to a magneto-optical disk and further has a vertical drive means capable of coming into contact with the surface of the magneto-optical disk. (4) Claim 3, characterized in that the magnetic field from the first magnetic field generating section or the second magnetic field generating section is selectively applied to the magneto-optical disk by determining the type of the magneto-optical disk. magneto-optical disk device.