JPH0489644A - Magneto-optical disk recording device - Google Patents

Abstract

PURPOSE:To make the intensity of a magnetic field on a magneto-optical disk constant by controlling a current amt. to be supplied to a magnetic field generating means based on a heightwise position of an objective lens to be detected by a height detecting means. CONSTITUTION:The magneto-optical disk 1 possesses a signal recording layer 1a capable of vertical magnetization, and an information signal is recorded by a different direction of vertical magnetization of this signal recording layer 1a. In this case, the current amt. to be supplied to the magnetic field generating means 26 disposed opposite to the magneto-optical disk 1 is controlled by a control means for controlling the current amt. based on the heightwise position of the objective lens 8 to be driven and controlled in order to make a distance from the objective lens, which is disposed via the magneto-optical disk 1 to be opposite to the magnetic field generating means 26, to the magneto-optical disk 1 constant, as against an optical system block part 2a of an optical pickup device 2. By this method, the magnetic field intensity on the magneto-optical disk 1 is made to be constant.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Use] The present invention relates to a magneto-optical disk recording device that writes information signals to a magneto-optical disk.

[Summary of the invention]

The present invention provides a magneto-optical disk recording device for writing information signals onto a magneto-optical disk, in which the amount of current for magnetic field generation supplied to a magnetic field generator that applies a magnetic field to the magneto-optical disk is increased by a control means. By changing the height according to the height position of the objective lens relative to the optical system block detected by the detection means, even if the magneto-optical disk causes so-called surface wobbling, the magnetic field generator can be moved without having to operate. , the magnetic field strength on the magneto-optical disk is kept constant so that information signals can be recorded satisfactorily.

Further, in the present invention, the current amount of the magnetic field generating current is varied by the control means in accordance with the strength of the magnetic field at the position of the objective lens detected by the magnetic field detection means, so that the so-called magneto-optical disk can be Even if surface wobbling occurs, the magnetic field strength on the magneto-optical disk is kept constant without moving the magnetic field generator.

Furthermore, the present invention allows the control means to vary the amount of current for generating a magnetic field in accordance with the amount of driving current for moving the objective lens in the optical axis direction by following the magneto-optical disk. As a result, even if the magneto-optical disk causes so-called surface wobbling, the magnetic field strength on the magneto-optical disk can be kept constant without having to move the magnetic field generator.

(Prior Art) Conventionally, a magneto-optical disk has been proposed which has a signal recording layer capable of so-called perpendicular magnetization and records information signals by varying the direction of perpendicular magnetization of the signal recording layer.

In order to write information signals onto such magneto-optical disks, a focused laser beam is irradiated onto the surface of the signal recording layer to heat only a small area above the so-called Curie temperature. At the same time, a magnetic field is applied to this region from the outside. Then, since the signal recording layer in the area irradiated with the laser beam has lost its coercive force,
The magnetization direction of this region follows the direction of the magnetic field applied from the outside.

That is, in such a magneto-optical disk, the direction of magnetization of the signal recording layer can be finely adjusted by appropriately adjusting the optical intensity of the laser beam and appropriately setting the direction and intensity of the externally applied magnetic field. It can be changed for each area, and high-density information signals can be written.

Therefore, a magneto-optical disk recording device used for writing information signals onto the magneto-optical disk is an optical pickup that focuses and irradiates a laser beam onto the surface of the signal recording layer of the magneto-optical disk, that is, the signal recording surface. The device includes a magnetic field generating device that applies a magnetic field to the signal recording layer.

That is, in such a magneto-optical disk recording device, an optical pickup device and a magnetic field generation device are arranged opposite to each other via a magneto-optical disk, and the magnetic field is applied to an area irradiated with a laser beam by the optical pickup device. A magnetic field is applied by a generator. Then, by rotating the magneto-optical disk and moving the optical pickup device and the magnetic field generating device in the radial direction of the magneto-optical disk, information signals are written over substantially the entire surface of the magneto-optical disk. be able to.

[Problem to be solved by the invention]

By the way, in the above-mentioned magneto-optical disk recording device, when writing information signals to the magneto-optical disk, the intensity of the magnetic field applied to the signal recording layer of the magneto-optical disk by the magnetic field generator is set to 225 to 225. 4000
It is necessary to achieve a grade of e or higher. Therefore, the magnetic field generating device needs to be installed close to the signal recording layer of the magneto-optical disk.

However, since the above-mentioned magneto-optical disk may have so-called warpage, there is a risk that this magneto-optical disk will cause so-called surface wobbling when rotated. If this surface wobbling occurs, if the magneto-optical disk and the magnetic field generator are placed close to each other, there is a risk that the magneto-optical disk and the magnetic field generator will come into contact and damage the magneto-optical disk. There is. Furthermore, if the distance between the magneto-optical disk and the magnetic field generator changes due to the surface wobbling, the strength of the magnetic field applied to the signal recording layer cannot be kept constant. If the strength of the magnetic field in the signal recording layer fluctuates, it is impossible to write information signals into the signal recording layer in a satisfactory manner.

Therefore, in conventional magneto-optical disk recording devices,
distance detection means for detecting the distance between the magnetic field generation section and the magneto-optical disk; and a movement operation means for moving the magnetic field generation section in the direction toward and away from the magneto-optical disk based on the detection result of the distance detection means. and is provided. In this magneto-optical disk recording device,
The magnetic field generating device is always located at a constant, minute distance from the signal recording layer of the magneto-optical disk.

In this way, in conventional magneto-optical disk recording devices,
Since it is necessary to provide distance detection means for detecting the distance between the magnetic field generation device and the magneto-optical disk and movement operation means for moving the magnetic field generation device, it is difficult to downsize and simplify the device configuration.

Therefore, the present invention is proposed in view of the above-mentioned circumstances, and includes a detection means for detecting the distance between the magneto-optical disk and the magnetic field generation device, and a movement operation means for moving the magnetic field generation means. A magneto-optical disk recording device that is capable of miniaturizing and simplifying the device configuration without any problems, and is also capable of effectively applying a magnetic field to the magneto-optical disk, thereby effectively writing information signals to the magneto-optical disk. The purpose is to provide

[Means to solve the problem]

In order to solve the above-mentioned problems and achieve the above-mentioned objects, the magneto-optical disk recording device of the present invention is arranged so as to face one side of the magneto-optical disk, and the drive is controlled so that the distance to the magneto-optical disk is constant. an objective lens for condensing light emitted from an optical system block section of an optical pickup device onto the magneto-optical disk; and a height detection means for detecting a height position of the objective lens with respect to the optical system block section. , a magnetic field generating means disposed facing the other surface of the magneto-optical disk and facing the objective lens via the magneto-optical disk, and a control means for controlling the amount of current supplied to the magnetic field generating means. The control means controls the amount of current supplied to the magnetic field generation means based on the height position of the objective lens detected by the height detection means.

Further, the magneto-optical disk recording device according to the present invention is arranged so as to face one side of the magneto-optical disk, and is driven and controlled so that the distance to the magneto-optical disk is constant, so that an optical pink is recorded on the magneto-optical disk. an objective lens that condenses light emitted from the optical system block section of the optical system block section of the optical system block section; and a magnetic field that is disposed opposite to the other surface of the magneto-optical disk and faces the objective lens via the magneto-optical disk. A generating means and the objective lens are arranged opposite to one side of the magneto-optical disk, and are driven and controlled so that the distance to the magneto-optical disk is constant, and detects the intensity of the magnetic field generated by the magnetic field generating means. and a control means for controlling the amount of current supplied to the magnetic field generation means, the control means controlling the amount of current supplied to the magnetic field generation means based on the magnetic field intensity detected by the magnetic field detection means. This is done by controlling the amount of current that flows.

Further, in the magneto-optical disk recording device according to the present invention, the magneto-optical disk is disposed facing one side of the magneto-optical disk, and is driven and controlled by an objective lens driving device so that the distance to the magneto-optical disk is constant. An objective lens is provided above to condense the light emitted from the optical system block section of the optical pink-up device, and an objective lens is disposed facing the other surface of the magneto-optical disk and is directed to the objective lens via the magneto-optical disk. Comprising magnetic field generating means facing each other and a control means for controlling the amount of current supplied to the magnetic field generating means, the control means controlling the amount of the driving current based on the amount of the driving current supplied to the objective lens driving device. This is achieved by controlling the amount of current supplied to the magnetic field generating means.

[Effect]

In the magneto-optical disk recording device according to the present invention, the control means for controlling the amount of current supplied to the magnetic field generating means disposed opposite to the magneto-optical disk is configured to control the amount of current supplied to the magnetic field generating means through the magneto-optical disk. The amount of current is controlled based on the height position of the objective lens with respect to the optical system block of the optical pickup device, which is disposed facing the magneto-optical disk and whose drive is controlled so that the distance to the magneto-optical disk is constant. The strength of the magnetic field on the magneto-optical disk can be made constant.

Further, in the magneto-optical disk recording device according to the present invention, the control means for controlling the amount of current supplied to the magnetic field generating means disposed opposite to the magneto-optical disk generates the magnetic field through the magneto-optical disk. The amount of current is controlled based on the intensity of the magnetic field detected by the magnetic field detection means, which is driven and controlled so that the distance to the magneto-optical disk is constant together with the objective lens disposed facing the generation means.
Therefore, the strength of the magnetic field on the magneto-optical disk can be kept constant.

Furthermore, in the magneto-optical disk recording device according to the present invention, the control means for controlling the amount of current supplied to the magnetic field generating means disposed opposite to the magneto-optical disk may be arranged to The amount of current is controlled based on the amount of drive current for driving and controlling the objective lens disposed facing the magnetic field generating means so that the distance to the magneto-optical disk is constant. The strength of the magnetic field on the magnetic disk can be made constant.

〔Example〕

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the magneto-optical disk recording device according to the present invention is an apparatus in which a magneto-optical disk 1 is mounted, and a device that writes information signals onto the magneto-optical disk 1 and records the information signals. It is.

The magneto-optical disk 1 has a signal recording layer 1a capable of so-called perpendicular magnetization, and is configured such that an information signal is recorded based on the difference in the perpendicular magnetization direction of the signal recording layer 1a. In order to write an information signal on the magneto-optical disk 1, a focused laser beam is irradiated onto the surface of the signal recording layer 1a to heat only a small area to a temperature higher than the so-called Curie temperature. With,
A magnetic field is applied to this region from the outside. At this time, the signal recording layer 1a in the area irradiated with the laser beam loses its coercive force, and its magnetization direction follows the direction of the externally applied magnetic field.

That is, in this magneto-optical disk 1, the optical intensity of the laser beam is appropriately adjusted, and the direction and intensity of the magnetic field applied from the outside are appropriately set, so that the magnetization direction of the signal recording layer 1a is adjusted for each minute region. The structure is such that high-density information signals can be written by changing the width.

The magneto-optical disk recording device according to the present invention has a disk table (not shown) that holds and rotates the mounted magneto-optical disk 1.

This magneto-optical disk recording apparatus includes an optical pickup device 2 for condensing and irradiating a laser beam onto the signal recording layer 1a of the magneto-optical disk 1.

The optical pickup device 2 is mounted on one side, which is the signal recording surface side, of the magneto-optical disk 1, which is placed on the disk table provided on the chassis (not shown) of the magneto-optical disk recording device and is rotated. are arranged facing each other. This optical pickup device 2 is an optical pickup device that houses and holds a laser diode 5 serving as a light source and a plurality of optical devices that guide a laser beam emitted from the laser diode 5 onto the surface of the signal recording layer 1a of the magneto-optical disk 1. It is configured to include a system block section 2a. This optical pickup device 2 includes the optical system block section 2a.
is slidably supported by a support shaft 3 provided on the chassis, thereby making it possible to move the magneto-optical disk 1 over the inner and outer peripheries, as shown by arrow T in FIG. .

In the optical system block section 2a, the laser beam emitted from the laser diode is collimated into a parallel beam by the collimator lens 6 and enters the beam splinter. The light beam transmitted through the beam splitter 7 is emitted from the optical system block section 2a.

The light beam emitted from the optical system block 2a is transferred to the signal recording layer l by the objective lens 8 supported by the objective lens drive device 9 provided on the optical system block 2a.
The light is focused on a. Then, the light reflected by the signal recording layer 1a enters the objective lens 8 again to form a parallel beam of light, enters the optical system block section a, and returns to the beam splitter 7. The light flux returning to the beam splitter 7 is reflected toward the detection lens 14 by the beam splitter. This detection lens 1
The light beam incident on the photodetector 5 is focused onto the photodetector 16 by the detection lens 15. This photodetector 16 converts the intensity of the light focused by the detection lens 15 into an electrical signal and sends it to an output terminal 17 as a photodetection signal. The signal output from this output terminal 17 becomes a read signal for the signal written on the magneto-optical disk 1.

The objective lens drive device 9 that supports the objective lens 8 is
Support arm section 4 provided on the optical system block section 2a
A lens bobbin 10 supported via a flexible arm 11 on
have. The objective lens 8 is attached to this lens bobbin 10. Due to the flexible displacement of the flexible arm 11, the lens bobbin 10 moves toward and away from the magneto-optical disk 1 mounted on the magneto-optical disk recording device, as shown by arrow F in FIG. 1, that is, in the focus direction. It is made movable. A drive coil 12 is attached to this lens bobbin 0.

Further, a magnet 13 attached to the optical system block portion 2a faces the drive coil 12. When the lens bobbin 10 is supplied with a predetermined drive current to the drive coil 12, the magneto-optical disk recording device It is possible to move the magneto-optical disk 1 mounted on the disk in the direction toward and away from the disk.

The drive current supplied to the drive coil 12 is supplied in accordance with a focus error signal generated by a focus error signal generation circuit 18 based on the photodetection output output from the photodetector 16. The focus error signal generation circuit 1 receives the photodetection output, performs a predetermined calculation based on the photodetection output, and generates a beam spot formed by the objective lens 8 and the signal recording layer 1.
A focus error signal is generated that indicates the distance from the surface of a, that is, the amount of defocus. This focus error signal is sent to the focus servo circuit 19. The focus servo circuit 19 calculates the amount of drive current supplied to the drive coil 12 in accordance with the sent focus error signal.

The focus servo circuit 19 controls the actuator driver 20 to supply a predetermined drive current to the drive coil 12.

Therefore, the coil bobbin 10 is operated to move in the focus direction in accordance with the focus error signal indicated by -F,
The beam spot generated by the objective lens 8 is always located on the surface of the signal recording layer 1a.

That is, in this magneto-optical disk recording device, by rotating the magneto-optical disk 1 and moving the optical pickup device 2, almost the entire surface of the signal recording layer 1a of the magneto-optical disk 1 is covered. The laser beam can be focused and irradiated over the entire area.

This magneto-optical disk recording device includes a magnetic field generator 26 for applying a magnetic field to the magneto-optical disk 1. This magnetic field generating device 26 is disposed facing the other side of the magneto-optical disk 1 by being supported by the tip side of the support arm 4 attached to the optical system block portion 2a. Further, this magnetic field generating device W26 is supported at a position facing the objective lens 8 via the magneto-optical disk 1. That is, when the optical pickup device 2 is operated to move in the radial direction of the magneto-optical disk 1, the magnetic field generating device 26 is moved and operated to follow the optical pickup device 2, and generates a magnetic field on the magneto-optical disk 1. A magnetic field is applied to a region irradiated with a laser beam by the optical pickup device 2.

The magnetic field generating device W26 includes a magnetic field generating coil 28 and an amplifier section 27 that supplies a magnetic field generating current to the magnetic field generating coil 28. The magnetic field generating coil 28 is used when the magneto-optical disk 1 is rotated and causes so-called surface wobbling.
The magneto-optical disk 1 is supported in close proximity to the other side of the magneto-optical disk 1 to such an extent that it does not come into contact with the disk.

The magnetic field generating device 26 is supplied with an applied magnetic field signal input from the input terminal 23 via a position signal generating circuit 21 serving as a control means, a subtracter 24, an adder 25, and the like.

This applied magnetic field signal is a signal that is modulated according to the information signal to be written when writing an information signal onto the magneto-optical disk 1 using a so-called magnetic field modulation method.

Further, this applied magnetic field signal is such a signal that the magnetic field strength is maintained constant when information signals are written to the magneto-optical disk 1 by a so-called optical modulation method.

The position signal generation circuit 21 includes the lens bobbin IO.
A position detection signal is sent from a position detection device 14, which serves as a height detection means attached to. As shown in FIG. 2, this position detection device 14 includes a light emitting element 29 supported by the lens bobbin 10, and first and second light emitting elements attached to the optical system block section 2a via a support member 30c. The light receiving element 30a30b is configured to include a light receiving element 30a30b.

In this position detection device 14, the light emitted from the light emitting element 29 is received by each of the light receiving elements 30a and 30b. These light receiving elements 30a and 30b are arranged in the movable direction of the lens bobbin 10 with respect to the optical system block portion 2a, that is, in the focusing direction.

When the lens bobbin 10 is at the reference position in the focus direction, the light emitting element 29 is connected to each of the light receiving elements 30a and 30b as shown in FIG.
It is arranged so that it faces the boundary position of .

Therefore, when the lens bobbin 10 is at the reference position in the focus direction, the light detection outputs of the light receiving elements 30a30b, which serve as the position detection signals, are equal to each other. When the lens bobbin 10 moves from the reference position in the focus direction, the light detection outputs of the light receiving elements 30a and 30b become different from each other, as shown in FIG. The position signal generation circuit 21 calculates a position signal by subtracting the light detection outputs from the light receiving elements 30a and 30b from each other. This position signal is a signal indicating the position of the objective lens 8 with respect to the optical system block portion 2a in the focusing direction.

The position signal is sent to a subtracter 24 via an inverting amplifier 22.
is supplied to the inverting input terminal of The applied magnetic field signal is input to the non-inverting input terminal of the subtracter 24 via the input terminal 23 . This applied magnetic field signal is also input to one input terminal of the adder 25. This adder 2
The output signal of the subtracter 24 is input to the other input terminal of the subtracter 5. That is, the output signal of the adder 25 is
The signal is a signal that causes fluctuations based on the applied magnetic field signal by the difference between the lung magnetic field signal and the position signal. The output signal of this adder 25 is supplied to the amplifier section 27 of the magnetic field generator 26. The amplifier unit 27 supplies a magnetic field generating current to the magnetic field generating coil 26 in accordance with the supplied output signal from the adder 25, thereby generating a magnetic field.

The magnetic field generated by the magnetic field generator 26 changes depending on the position of the objective lens 8, which is moved in the focus direction following the so-called surface wobbling of the magneto-optical disk 1. The signal recording layer 1a
A constant strength is maintained at the surface.

In the magneto-optical disk recording device according to the present invention configured as described above, even though the magnetic field generating device 26 is not moved in the direction toward and away from the magneto-optical disk 1, the signal of the magneto-optical disk 1 is A magnetic field of a constant strength is always applied to the region of the recording layer 1a on which the optical pickup device 2 irradiates the laser beam, so that information signals can be written on the magneto-optical disk 1 in a good manner.

Note that the magneto-optical disk recording device according to the present invention can be constructed using a so-called magnetic field strength detection device instead of the position detection device 14 described above. This magnetic field strength detection device is attached to the lens bobbin 10 and detects the strength of the magnetic field generated by the magnetic field generation device 26 at the position of the lens bobbin 10. Then, the position signal generation circuit 21 compares the strength of the detected magnetic field with the strength of the magnetic field at the preset position of the lens bobbin 10 when the lens bobbin 10 is at a reference position in the focus direction. By doing so, the position of the lens bobbin 10 in the focus direction with respect to the optical system block section 2a is calculated.

The magnetic field generating device 26 is supplied with the applied magnetic field signal via the control means that controls the applied magnetic field signal according to the position of the lens bobbin 10 detected in this way. A magnetic field is generated so that the magnetic field strength is always constant on the surface of la. Therefore, in this magneto-optical disk recording device, a magnetic field of a constant strength is always applied to the area of the signal recording layer 1a of the magneto-optical disk 1 that is irradiated with a laser beam by the optical pick-up device 2. Good information signals can be written onto the disc 1.

Further, in the magneto-optical disk recording device according to the present invention, the focus servo circuit 19 supplies a signal indicating the position of the lens bobbin 10 in the focus direction to the drive coil 12, which is calculated according to the focus error signal. It can be configured to use a signal indicating the amount of drive current to be applied. That is, in this magneto-optical disk recording device, as shown in FIG. 24 and the adder 25. This control means varies the applied magnetic field signal input from the input terminal 23 in accordance with a signal indicating the amount of drive current supplied to the drive coil 12, and sends the signal to the magnetic field generator 26.

Therefore, in this magneto-optical disk recording device,
A magnetic field of constant strength can always be applied to the region of the signal recording layer 1a of the magneto-optical disk 1 to which the optical pickup device 2 irradiates the laser beam, and information signals can be written to the magneto-optical disk 1 in good condition. It can be performed.

〔Effect of the invention〕

As described above, in the magneto-optical disk recording device according to the present invention, the control means for controlling the amount of current supplied to the magnetic field generating means disposed opposite to the magneto-optical disk is configured to control the amount of current supplied to the magnetic field generating means disposed opposite to the magneto-optical disk. The amount of current is determined based on the height position of the objective lens with respect to the optical block of the optical pickup device, which is disposed facing the magnetic field generating means and whose drive is controlled so that the distance to the magneto-optical disk is constant. Since the magnetic field is controlled, the strength of the magnetic field on the magneto-optical disk can be kept constant.

Further, in the magneto-optical disk recording device according to the present invention, the control means for controlling the amount of current supplied to the magnetic field generating means disposed opposite to the magneto-optical disk generates the magnetic field through the magneto-optical disk. The amount of current is controlled based on the intensity of the magnetic field detected by the magnetic field detecting means, which is driven and controlled so that the distance to the magneto-optical disk is constant together with the objective lens disposed facing the generating means. , the strength of the magnetic field on the magneto-optical disk can be made constant.

Furthermore, in the magneto-optical disk recording device according to the present invention, the control means for controlling the amount of current supplied to the magnetic field generating means disposed opposite to the magneto-optical disk is configured to generate a magnetic field through the magneto-optical disk. The amount of current is controlled based on the amount of drive current for driving and controlling the objective lens disposed facing the generating means so that the distance to the magneto-optical disk is constant. The strength of the magnetic field on the disk can be made constant.

That is, the present invention does not require a detection means for detecting the distance between the magneto-optical disk and the magnetic field generation device, a moving operation means for moving the magnetic field generation means, etc., and the device configuration can be downsized and simplified. Accordingly, it is possible to provide a magneto-optical disk recording device which can satisfactorily apply a magnetic field to the magneto-optical disk and thereby write information signals onto the magneto-optical disk.

[Brief explanation of drawings]

FIG. 1 is a side view schematically showing the configuration of a magneto-optical disk recording device according to the present invention. FIG. 2 is an enlarged side view schematically showing the configuration of a height detection device that is a main part of the magneto-optical disk recording device, and FIG. 3 is an optical receiver that is a main part of the height detection device. FIG. 4 is an enlarged front view schematically showing the configuration of FIG. FIG. 5 is a side view schematically showing another example of the configuration of the magneto-optical disk recording device. 1...Magneto-optical disk 2...Optical pickup device 2a...
...Optical system block section 8...Objective lens 9...Objective lens drive device 14...
...Position detection device 21...Position signal generation circuit 24...
...Subtractor 25...Adder 26...Magnetic field generator

Claims (3)

[Claims] (1) Disposed facing one side of the magneto-optical disk,
an objective lens that is driven and controlled so that the distance to the magneto-optical disk is constant and condenses light emitted from an optical system block section of an optical pickup device onto the magneto-optical disk; and the optical system of the objective lens. height detection means for detecting a height position relative to the system block; and magnetic field generation means disposed facing the other surface of the magneto-optical disk and facing the objective lens via the magneto-optical disk. and control means for controlling the amount of current supplied to the magnetic field generation means, the control means supplying the current to the magnetic field generation means based on the height position of the objective lens detected by the height detection means. A magneto-optical disk recording device that controls the amount of current applied. (2) disposed facing one side of the magneto-optical disk;
an objective lens that is driven and controlled so that the distance to the magneto-optical disk is constant and condenses light emitted from an optical system block section of an optical pickup device onto the magneto-optical disk; a magnetic field generating means disposed facing one side of the magneto-optical disk and facing the objective lens through the magneto-optical disk; A magnetic field detecting means that is drive-controlled so that the distance to the magnetic disk is constant and detects the intensity of the magnetic field generated by the magnetic field generating means, and a control means that controls the amount of current supplied to the magnetic field generating means. A magneto-optical disk recording device, wherein the control means controls the amount of current supplied to the magnetic field generation means based on the magnetic field intensity detected by the magnetic field detection means. (3) disposed facing one side of the magneto-optical disk;
an objective lens that is driven and controlled by an objective lens driving device so that the distance to the magneto-optical disk is constant, and condenses light emitted from an optical axis system block portion of an optical pickup device onto the magneto-optical disk; a magnetic field generating means disposed facing the other surface of the magneto-optical disk and facing the objective lens via the magneto-optical disk; and a control means for controlling the amount of current supplied to the magnetic field generating means. A magneto-optical disk recording device, wherein the control means controls the amount of current supplied to the magnetic field generation means based on the amount of drive current supplied to the objective lens drive device.