JP4499881B2 - Magneto-optical disk unit - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a magneto-optical disk apparatus for recording / reproducing information on / from a magneto-optical disk.
[0002]
[Prior art]
Conventionally, as a magneto-optical disk device for generally driving a magneto-optical disk, for example, as disclosed in Japanese Patent Laid-Open No. 9-69281, a bias magnetic field is applied to a recording medium using an electromagnet to record information. And erase.
[0003]
Here, the magneto-optical disk apparatus having a capacity of 1.3 giga requires a bias magnetic field in the recording direction during reproduction for MSR (magnetic super-resolution) reproduction. In this case, the magnetic field strength is 300 [ Oe] degree is required. Further, at the time of recording and erasing, the intensity of the bias magnetic field is defined as 200 to 400 [Oe] in the ISO standard.
[0004]
As an apparatus for generating a bias magnetic field, an electromagnet is generally used. However, in order to increase the strength of the magnetic field, it is necessary to flow a large amount of current through the coil, and the amount of heat generation increases, so that the magneto-optical disk apparatus. The internal temperature increases and the reliability decreases. For this reason, a magnetic field of about 250 [Oe] close to the ISO standard lower limit is generally generated during recording and erasing.
[0005]
However, since a magnetic field of about 300 [Oe] is required at the time of MSR reproduction, the current value of the coil is increased to secure the magnetic field, and the temperature inside the magneto-optical disk device is high, resulting in a decrease in reliability. Had occurred.
[0006]
[Problems to be solved by the invention]
As described above, in the conventional magneto-optical disk device, a magnetic field of about 300 [Oe] is required during MSR reproduction, so the magnetic field is secured by increasing the coil current value, and the amount of heat generation is increased. There has been a problem that the temperature inside the disk device becomes high and the reliability decreases.
[0007]
The present invention has been made in view of these circumstances, and an object of the present invention is to provide a magneto-optical disk apparatus that can secure a reproducing magnetic field, a recording magnetic field, and an erasing magnetic field for MSR reproduction without increasing the amount of heat generation.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a first magneto-optical disk apparatus according to the present invention generates a spindle motor that rotates a magneto-optical disk for magnetic super-resolution stored in a cartridge, an objective lens, and generates an external magnetic field. A magnetic field generating device to be applied to a magneto-optical disk, and the magnetic field generating device applies an external magnetic field to the magneto-optical disk, and irradiates the magneto-optical disk with a light beam through the objective lens to record and reproduce information. During the recording and reproduction of the semiconductor laser, the objective lens is driven in the radial direction of the magneto-optical disk by a magnetic circuit, and the direction of the leakage magnetic field from the magnetic circuit is recorded at the recording spot of the magneto-optical disk. with the direction of the side, at the time of magnetically induced super resolution readout is characterized by including a, an objective lens driving device as the direction of the reproducing magnetic field To.
[0009]
With this configuration, since the leakage magnetic field of the magnetic circuit of the objective lens driving device is applied to the recording spot of the magneto-optical disk together with the external magnetic field of the magnetic field generator, the reproducing magnetic field, recording magnetic field and An erasing magnetic field can be secured.
[0010]
In order to achieve the above object, a second magneto-optical disk apparatus according to the present invention generates a spindle motor for rotating a magneto-optical disk for magnetic super resolution stored in a cartridge, an objective lens, and an external magnetic field to generate the above-mentioned object. A magnetic field generating device to be applied to a magneto-optical disk, and the magnetic field generating device applies an external magnetic field to the magneto-optical disk, and irradiates the magneto-optical disk with a light beam through the objective lens to record and reproduce information. A semiconductor laser, an objective lens driving device for driving the objective lens in a radial direction of the magneto-optical disk by a first magnetic circuit during the recording and reproduction, and a second magnetic circuit by the second magnetic circuit during the recording and reproduction; The objective lens driving device is driven in the radial direction of the magneto-optical disk, and the direction of the leakage magnetic field from the second magnetic circuit is determined by the magneto-optical disk. With the direction of the recording side in the recording spot, the magnetic super resolution playback is characterized by comprising a voice coil motor serving as a direction of the reproducing magnetic field.
[0011]
With this configuration, the leakage magnetic field of the second magnetic circuit of the voice coil motor is applied to the recording spot of the magneto-optical disk together with the external magnetic field of the magnetic field generator, so that the reproducing magnetic field and recording of MSR reproduction can be achieved without increasing the amount of heat generation. A magnetic field and an erasing magnetic field can be secured.
[0012]
In order to achieve the above object, a third magneto-optical disk apparatus according to the present invention generates a spindle motor for rotating a magneto-optical disk for magnetic super-resolution stored in a cartridge, an objective lens, and an external magnetic field to A magnetic field generating device to be applied to a magneto-optical disk, and the magnetic field generating device applies an external magnetic field to the magneto-optical disk, and irradiates the magneto-optical disk with a light beam through the objective lens to record and reproduce information. A semiconductor laser, an objective lens driving device that drives the objective lens in the radial direction of the magneto-optical disk by a first magnetic circuit during the recording and reproduction, and a magnetic field direction provided in the vicinity of the magneto-optical disk auxiliary permanent but with the direction of the recording side in the recording spot of the magneto-optical disk, which is a direction of the reproducing magnetic field upon the magnetic super-resolution reproducing And characterized by including a stone, a.
[0013]
With this configuration, since the magnetic field of the auxiliary permanent magnet is applied to the recording spot of the magneto-optical disk together with the external magnetic field of the magnetic field generator, the reproducing magnetic field, recording magnetic field and erasing magnetic field for MSR reproduction can be secured without increasing the amount of heat generation. .
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0015]
(First embodiment)
1 to 8 relate to a first embodiment of the present invention, FIG. 1 is an exploded perspective view showing a magneto-optical disk device, and FIG. 2 is an enlarged perspective view showing a claw portion of the frame of FIG. 3 is an enlarged perspective view showing an insulator mounting portion of the frame of FIG. 1, FIG. 4 is a perspective view showing an optical movable pickup and its peripheral portion, and FIG. 5 is an exploded perspective view of the optical movable pickup. 6 is an explanatory diagram showing the positional relationship among the optical movable pickup, the magneto-optical disk, and the bias magnetic field electromagnet, FIG. 7 is an explanatory diagram showing a first method for adjusting the magnitude of the leakage magnetic field of the magnetic circuit, and FIG. It is explanatory drawing which shows the 2nd method of adjusting the magnitude | size of the leakage magnetic field of a magnetic circuit.
[0016]
As shown in FIG. 1, a magneto-optical disk device 1 includes a deck section 2 for reading and writing disk information, a frame 4 for supporting the deck section 2 via four insulators 3, a circuit board 5, and a top cover. 61, a rear cover 62, and a bottom cover 63. An opening 64 for inserting a disk cartridge is provided on the front surface of the magneto-optical disk apparatus 1.
[0017]
The deck unit 2 includes a spindle motor that rotates a magneto-optical disk of a disk-shaped information recording medium housed in a cartridge, an optical movable pickup 74 (see FIG. 4) that reads and writes signals on the magneto-optical disk, and an optical fixed. A pickup 25, a bias magnetic field electromagnet 20 for applying a bias magnetic field to the magneto-optical disk, and a DC motor for electrically ejecting the magneto-optical disk are provided.
[0018]
The optical fixed pickup 25 is provided with a semiconductor laser that irradiates the magneto-optical disk with a light beam through the objective lens 8 (see FIG. 4) of the optical movable pickup 74.
[0019]
The deck unit 2 is provided with FPCs (flexible printed wiring boards) 21, 22, 23, and 24 connected to the circuit board 5. The FPC 21 is for a spindle motor, the FPC 22 is for an optical movable pickup 74, the FPC 23 is for a DC motor for electrically ejecting the bias magnetic field electromagnet 20 and the magneto-optical disk, and the FPC 24 is for an optical fixed pickup 25. The FPCs 21, 22, 23, and 24 are connected to the FPC connectors 51, 52, 53, and 54 of the circuit board 5, respectively. The FPC connectors 51, 52 and 53 of the circuit board 5 are of a type in which the FPC is inserted from the horizontal direction, and the FPC connector 54 is a type of inserting the FPC from the vertical direction. The FPC 24 is shortened as much as possible to prevent signal deterioration from the optical fixed pickup 25 and is connected to the FPC connector 54.
[0020]
A structure for attaching the insulator 3 to the frame 4 will be described with reference to FIGS.
[0021]
As shown in FIG. 2, the frame 4 is formed with upper and lower claw portions 41 and 42 that are curved inward.
[0022]
As shown in FIG. 3, the insulator 3 is formed in a cylindrical shape, and a cross hole 32 is formed in the wall surface 31 on one end side. The insulator 3 is made of an elastic material such as butyl rubber. In the insulator 3, the claw portions 41, 42 of the frame 4 are inserted from the opening on the other end side, and the tips of the claw portions 41, 42 are inserted into the vertical portion of the cross hole 32.
[0023]
Further, the deck portion 2 is elastically supported by the frame 4 by inserting the claw portions 26 (four places) of the deck portion 2 shown in FIG. 1 into the horizontal portion of the cross hole 32 of the insulator 3 shown in FIG. In this case, the deck unit 2 is assembled so that the U-shape of the frame 4 is opened.
[0024]
As shown in FIG. 4, the deck base 71 of the deck unit 2 is mounted with an optical movable pickup 74 with an objective lens 8 attached thereto so that it can slide in the radial direction A of the magneto-optical disk by shafts 72 and 73. Yes. Voice coil motors (VCM) 75 and 76 are provided on the left and right sides of the optical movable pickup 74 with respect to the sliding direction A. The VCMs 75 and 76 drive the optical movable pickup 74 in the radial direction of the magneto-optical disk during recording and reproduction. The deck base 71 is formed with a through hole 70 through which the light beam from the optical fixed pickup 25 of FIG.
[0025]
As shown in FIG. 5, the optical movable pickup 74 has an objective lens 8 and an objective lens driving device 81 for driving the objective lens 8 in the radial direction of the magneto-optical disk by a magnetic circuit during recording and reproduction. Is provided.
[0026]
The objective lens driving device 81 includes a lower frame 82 to which coils 77 and 78 of the VCMs 75 and 76 are attached and fixed, an upper frame 83, and an objective lens attachment portion 84 to which the objective lens 8 is attached.
[0027]
The lower frame 82 is formed in a box shape whose upper side is open, and a through hole 86 through which a light beam from the optical fixed pickup 25 in FIG. 1 passes is formed in the wall 85 on the optical fixed pickup 25 side, and is formed in the center. Is provided with a rising mirror 87 for reflecting the light beam from the optical fixed pickup 25 upward. Further, the lower frame 82 is formed with through holes 88 and 89 into which the shafts 72 and 73 of FIG. 4 are inserted. Four shafts 90 are provided on the lower surface of the upper frame 83, and four through holes 91 into which the four shafts 90 are inserted are formed in the lower frame 82.
[0028]
The upper frame 83 is provided with indicating members 92 and 92 for instructing the objective lens mounting portion 84 in a state in which the objective lens mounting portion 84 can be moved in the radial direction of the magneto-optical disk, yokes 93 and 94, and permanent magnets 95 and 96. The objective lens mounting portion 84 is provided with tracking coils 97 and 98, and tracking driving is performed by controlling the current flowing through the tracking coils 97 and 98.
[0029]
With such a structure, the objective lens driving device 81 causes the objective lens 8 to be moved to the light beam by the first magnetic circuit (yokes 93 and 94, permanent magnets 95 and 96, tracking coils 97 and 98) during recording and reproduction. Drive in the radial direction of the magnetic disk. The VCMs 75 and 76 drive the objective lens driving device 81 in the radial direction of the magneto-optical disk by a second magnetic circuit (yoke, permanent magnet, coils 77 and 78) during recording and reproduction.
[0030]
As shown in FIG. 6, a bias magnetic field electromagnet 20 is arranged on the opposite side of the optical pickup 74 with the magneto-optical disk 99 interposed therebetween. The bias magnetic field electromagnet 20 is a magnetic field generator that generates an external magnetic field and applies it to the magneto-optical disk during recording and reproduction.
[0031]
The yokes 93 and 94 are formed by bending a metal plate into a U-shape, and are disposed on both the left and right sides inside the optical pickup, respectively, and permanent magnets 95 and 96 are provided on the inner surfaces of the outer walls 201 and 202, respectively. It is attached. The bias magnetic field electromagnet 20 has a structure in which a bias coil 101 is held by a bias coil holder 102 and a cylindrical yoke 103 is provided at the center of the bias coil 101.
[0032]
The arrow in this figure represents the direction of the magnetic field leaking from the magnetic circuit by the permanent magnets 95 and 96 and the yokes 93 and 94 of the objective lens driving device 81 of the optical movable pickup 74 to the disk side. The direction of the leakage magnetic field is the recording side at the recording spot 104 of the magneto-optical disk 99, and the direction of the reproducing magnetic field at the time of MSR reproduction.
[0033]
(Function)
In the case of the present embodiment, the first magnetic circuit of the objective lens driving device 81 is designed so that the magnitude of the leakage magnetic field is 50 [Oe], and the magnitude of the magnetic field generated by the bias field electromagnet 20 is 250. Assuming [Oe], the magnetic field on the recording surface of the magneto-optical disk 99 at the time of MSR reproduction and recording is 250 + 50 = 300 [Oe], and at the time of erasure 250−50 = 200 [Oe]. In this way, the MSR reproducing magnetic field 300 [Oe] can be secured without increasing the amount of heat generation.
As a method of adjusting the magnitude of the leakage magnetic field of the magnetic circuit in the objective lens driving device, the size of the permanent magnets 95 and 96 is adjusted to the broken line as shown in FIG. 7, and the yoke 93 is shown in FIG. , 94 may be adjusted to a broken line state.
[0034]
As a method of adjusting the magnitude of the leakage magnetic field of the magnetic circuit in the objective lens driving device, the size of the permanent magnets 95 and 96 is adjusted to the broken line as shown in FIG. 7, and the yoke 93 is shown in FIG. , 94 may be adjusted to a broken line state.
[0035]
(effect)
According to such an embodiment, since the leakage magnetic field of the magnetic circuit of the objective lens driving device 81 is applied to the recording spot 104 of the magneto-optical disk 99 together with the external magnetic field of the bias magnetic field electromagnet 20, the amount of heat generation can be increased. In addition, the reproducing magnetic field, recording magnetic field, and erasing magnetic field for MSR reproduction can be secured, thereby simplifying the cooling mechanism for cooling the magneto-optical disk device, and reducing the size and cost of the product equipped with the magneto-optical disk device. Energy saving can be achieved.
[0036]
(Second Embodiment)
9 to 12 relate to the second embodiment of the present invention. FIG. 9 is an explanatory diagram showing the positional relationship between the VCM, the magneto-optical disk, and the bias field electromagnet, and FIG. 10 is viewed from the side of the yoke of the VCM. FIG. 11 is an explanatory view showing a first method for adjusting the magnitude of the leakage magnetic field of the magnetic circuit, and FIG. 12 is an explanatory view showing a second method for adjusting the magnitude of the leakage magnetic field of the magnetic circuit. . Components other than FIGS. 9 to 12 are the same as those of the embodiment shown in FIGS. 1 to 5.
[0037]
As shown in FIG. 9, the arrows indicate the direction of the magnetic field leaking from the second magnetic circuit (permanent magnets 111 and 112, VCM yokes 113 and 114) of the VCMs 75 and 76 to the magneto-optical disk 99 side. As shown in FIG. 10, the VCM yokes 113 and 114 include a flat plate-like lower yoke 121 and an upper yoke 122 that is bent forward and backward and joined to the lower yoke. Permanent magnets 111 and 112 are attached to the lower surface of 121.
[0038]
As shown in FIG. 9, the direction of the leakage magnetic field from the second magnetic circuit of the VCMs 75 and 76 is the recording side at the recording spot 104 of the magneto-optical disk 99, and is the direction of the reproducing magnetic field during MSR reproduction.
[0039]
(Function)
In the present embodiment, if the second magnetic circuit is designed so that the magnitude of the leakage magnetic field is 50 [Oe], and the magnitude of the magnetic field generated by the bias field electromagnet 20 is 250 [Oe], The magnetic field on the recording surface of the magneto-optical disk 99 during MSR playback and recording is 300 [Oe] at 250 to 50 and 200 [Oe] at 250-50 at the time of erasure. In this way, the MSR reproducing magnetic field 300 [Oe] can be secured without increasing the amount of heat generation. In this case, the magnetic circuit is designed so that the magnetic field leaking from the first magnetic circuit of the objective lens driving device 74 to the disk side is close to zero.
[0040]
As a method of adjusting the magnitude of the leakage magnetic field of the VCMs 75 and 76, the size of the permanent magnets 95 and 96 is adjusted to the broken line state as shown in FIG. 11, and the thickness of the yokes 93 and 94 as shown in FIG. There is a method such as adjusting the height to the state of a broken line.
[0041]
(effect)
According to the embodiment of the present invention, the leakage magnetic field of the second magnetic circuit of the VCMs 75 and 76 is applied to the recording spot of the magneto-optical disk together with the external magnetic field of the bias magnetic field electromagnet 20, so that the amount of heat generation is increased. Therefore, the reproducing magnetic field, recording magnetic field and erasing magnetic field of MSR reproduction can be secured, and the same effect as the embodiment shown in FIGS. 1 to 8 can be obtained.
[0042]
(Third embodiment)
FIG. 13 is an explanatory view showing the positional relationship between the magneto-optical disk and the bias field electromagnet according to the third embodiment of the present invention.
[0043]
As shown in FIG. 13, an auxiliary permanent magnet 222 is provided at the upper end of the yoke 221 of the bias field electromagnet 220. The auxiliary permanent magnet 222 sets the polarity so that the direction of the magnetic field is the recording direction at the recording spot 104 of the magneto-optical disk 99, and the magnitude of the magnetic field at the recording spot 104 is 50 [0e] (the direction is MSR reproduction). The size of the auxiliary permanent magnet 222 is set so as to be in the direction of the magnetic field.
[0044]
(Function)
With such a configuration, the MSR reproducing magnetic field 300 [Oe] can be secured by the magnetic field of the auxiliary permanent magnet 222 without causing an increase in the amount of heat generation.
[0045]
(effect)
Since the magnetic field of the auxiliary permanent magnet 222 is applied to the recording spot of the magneto-optical disk together with the external magnetic field of the bias magnetic field electromagnet 20, the same effects as those of the embodiment shown in FIGS.
[0046]
In the embodiment of FIG. 13, the upper end of the yoke 221 of the bias magnetic field electromagnet 220 is used as the position where the auxiliary permanent magnet 222 is provided, but the magnetic field direction is light in the vicinity of the magneto-optical disk 99 other than this. Various conditions can be applied if the condition that the recording spot 104 of the magnetic disk 99 is in the recording direction is satisfied.
[0047]
[Appendix]
According to the above-described embodiment of the present invention described in detail above, the following configuration can be obtained.
[0048]
(1) a spindle motor that rotates a magneto-optical disk stored in the cartridge;
An objective lens;
A magnetic field generator for generating an external magnetic field and applying it to the magneto-optical disk;
With this magnetic field generating device applying an external magnetic field to the magneto-optical disk, a semiconductor laser that records and reproduces information by irradiating the magneto-optical disk with a light beam through the objective lens,
During the recording and reproduction, the objective lens is driven in the radial direction of the magneto-optical disk by a magnetic circuit, and the direction of the leakage magnetic field from the magnetic circuit is the recording direction at the recording spot of the magneto-optical disk. A lens driving device;
A magneto-optical disk apparatus comprising:
[0049]
(2) a spindle motor that rotates a magneto-optical disk stored in the cartridge;
An objective lens;
A magnetic field generator for generating an external magnetic field and applying it to the magneto-optical disk;
With this magnetic field generating device applying an external magnetic field to the magneto-optical disk, a semiconductor laser that records and reproduces information by irradiating the magneto-optical disk with a light beam through the objective lens,
An objective lens driving device for driving the objective lens in a radial direction of the magneto-optical disk by a first magnetic circuit at the time of the recording and reproduction;
During the recording and reproduction, the objective lens driving device is driven in the radial direction of the magneto-optical disk by a second magnetic circuit, and the direction of the leakage magnetic field from the second magnetic circuit is determined by the magneto-optical disk. A voice coil motor that is in the recording direction at the recording spot;
A magneto-optical disk apparatus comprising:
[0050]
(3) a spindle motor for rotating a magneto-optical disk stored in the cartridge;
An objective lens;
A magnetic field generator for generating an external magnetic field and applying it to the magneto-optical disk;
With this magnetic field generating device applying an external magnetic field to the magneto-optical disk, a semiconductor laser that records and reproduces information by irradiating the magneto-optical disk with a light beam through the objective lens,
An objective lens driving device for driving the objective lens in a radial direction of the magneto-optical disk by a first magnetic circuit at the time of the recording and reproduction;
A voice coil motor that drives the objective lens driving device in a radial direction of the magneto-optical disk by a second magnetic circuit during the recording and reproduction;
An auxiliary permanent magnet provided in the vicinity of the magneto-optical disk, the direction of the magnetic field being a recording direction at a recording spot of the magneto-optical disk;
A magneto-optical disk apparatus comprising:
[0051]
(4) The power supply device according to appendix 1, wherein a permanent magnet is used for the magnetic circuit.
[0052]
(5) The power supply device according to appendix 2, wherein a permanent magnet is used for the second magnetic circuit.
[0053]
【The invention's effect】
As described above, according to the first to third aspects of the present invention, the reproducing magnetic field, the recording magnetic field, and the erasing magnetic field of the MSR reproduction can be secured without increasing the calorific value, and the cooling for cooling the magneto-optical disk apparatus. The mechanism can be simplified, and the product mounted with the magneto-optical disk apparatus can be reduced in size and cost can be saved.
[Brief description of the drawings]
FIG. 1 is an explanatory perspective view illustrating a magneto-optical disk device according to a first embodiment of the invention.
2 is an enlarged perspective view showing a claw portion of the frame of FIG. 1;
3 is an enlarged perspective view showing an insulator mounting portion of the frame of FIG. 1. FIG.
4 is a perspective view showing an optical movable pickup of the deck portion of FIG. 1 and its peripheral portion. FIG.
5 is an exploded perspective view of the optical movable pickup shown in FIG.
6 is an explanatory diagram showing a positional relationship among the optical movable pickup, the magneto-optical disk, and the bias field electromagnet shown in FIG. 4;
7 is an explanatory diagram showing a first method for adjusting the magnitude of a leakage magnetic field of the magnetic circuit of FIG. 6;
8 is an explanatory diagram showing a second method of adjusting the magnitude of the leakage magnetic field of the magnetic circuit of FIG. 6. FIG.
FIG. 9 is an explanatory diagram showing a positional relationship among a VCM, a magneto-optical disk, and a bias magnetic field electromagnet according to a second embodiment of the present invention.
10 is a cross-sectional view of the VCM yoke of FIG. 9 as viewed from the side.
11 is an explanatory diagram showing a first method for adjusting the magnitude of a leakage magnetic field of the magnetic circuit of FIG. 9;
FIG. 12 is an explanatory diagram showing a second method of adjusting the magnitude of the leakage magnetic field of the magnetic circuit.
FIG. 13 is an explanatory diagram showing the positional relationship between a magneto-optical disk and a bias magnetic field electromagnet according to a third embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Magneto-optical disk apparatus 2 ... Deck part 8 ... Objective lens 20 ... Bias magnetic field electromagnet 81 ... Objective lens drive device 93, 94 ... Yoke 95, 96 ... Permanent magnet

Claims (3)

A spindle motor that rotates a magneto-optical disk for magnetic super-resolution stored in a cartridge;
An objective lens;
A magnetic field generator for generating an external magnetic field and applying it to the magneto-optical disk;
With this magnetic field generating device applying an external magnetic field to the magneto-optical disk, a semiconductor laser that records and reproduces information by irradiating the magneto-optical disk with a light beam through the objective lens;
During the recording and reproduction, the objective lens is driven in the radial direction of the magneto-optical disk by a magnetic circuit, and the direction of the leakage magnetic field from the magnetic circuit is the recording side direction in the recording spot of the magneto-optical disk. And at the time of magnetic super-resolution reproduction , an objective lens driving device that becomes the direction of the reproduction magnetic field ,
A magneto-optical disk apparatus comprising: A spindle motor that rotates a magneto-optical disk for magnetic super-resolution stored in a cartridge;
An objective lens;
A magnetic field generator for generating an external magnetic field and applying it to the magneto-optical disk;
With this magnetic field generating device applying an external magnetic field to the magneto-optical disk, a semiconductor laser that records and reproduces information by irradiating the magneto-optical disk with a light beam through the objective lens;
An objective lens driving device for driving the objective lens in the radial direction of the magneto-optical disk by a first magnetic circuit during the recording and reproduction;
During the recording and reproduction, the objective lens driving device is driven in the radial direction of the magneto-optical disk by the second magnetic circuit, and the direction of the leakage magnetic field from the second magnetic circuit is determined by the magneto-optical disk. A voice coil motor that is in the direction of the recording side at the recording spot and in the direction of the reproducing magnetic field at the time of magnetic super-resolution reproduction ;
A magneto-optical disk apparatus comprising: A spindle motor that rotates a magneto-optical disk for magnetic super-resolution stored in a cartridge;
An objective lens;
A magnetic field generator for generating an external magnetic field and applying it to the magneto-optical disk;
With this magnetic field generating device applying an external magnetic field to the magneto-optical disk, a semiconductor laser that records and reproduces information by irradiating the magneto-optical disk with a light beam through the objective lens;
An objective lens driving device for driving the objective lens in the radial direction of the magneto-optical disk by a first magnetic circuit during the recording and reproduction;
An auxiliary permanent magnet provided in the vicinity of the magneto-optical disk, the direction of the magnetic field being the direction of the recording side at the recording spot of the magneto-optical disk, and the direction of the reproducing magnetic field during magnetic super-resolution reproduction ;
A magneto-optical disk apparatus comprising:

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