JPH06215437A - Magneto-optical storage device - Google Patents

Abstract

PURPOSE:To remove dust, etc., attracted to a residual magnetized part of a dielectric substance by demagnetizing it in moving an actuator in an AC magnetic field generated by a magnetic head. CONSTITUTION:At the time of normal write operation and erasing operation, the magnetic head 1 is driven by a current to be supplied from a current supply means 2 controlled by a CPU 4, and at the time of demagnetizing operation, an AC current is supplied to the magnetic head 1 by connecting an AC component impressing means 3 to the current supply means 2. In this case, an external magnetic field is generated by conducting an AC current into a coil 1b, and the residual magnetic field in a core part 1a is gradually reduced. In this magneto-optical storage device, an AC current generating means is used as the magnetic head 1, and the actuator 5 is set in the AC magnetic field M1, so that the magnetic head 1 is demagnetized, while a dielectric substance part of the actuator 5, such as, for instance, a lens protective plate 5b consisting of the dielectiric substance is demagnetized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magneto-optical storage device for recording / erasing information by irradiating a laser beam while applying a vertical magnetic field to a recording medium, and more particularly to demagnetizing a magnetic head. At the same time, by demagnetizing the metal part of the actuator at the same time, the dust and the like adsorbed to the dielectric due to the residual magnetization is intentionally released, and the magneto-optical storage device can be removed to the outside of the device. The present invention relates to a cleaning cartridge suitable for use in.

[0002]

2. Description of the Related Art Conventionally, in a magneto-optical storage device, information is recorded / erased by irradiating a rotating recording medium with a laser beam while applying a vertical magnetic field. When recording / erasing information on / from a recording medium, a magnetic field having an intensity higher than an external magnetic field is applied to a recording point of the information recording medium, and the recording medium is irradiated with laser light to be heated.
Is performed.

In this magneto-optical storage device, the means for applying a desired magnetic field having a strength higher than the external magnetic field to the recording point of the recording medium is usually called a magnetic head, and is composed of a coil and a dielectric (core portion).
A means for controlling the magnitude of the current flowing through the coil to generate a magnetic field of desired strength is often used. In such a magneto-optical disk device, in particular, a storage device including a magnetic head or an actuator controlled by current, a large number of magnets and magnetized dielectrics are used inside the device, and a complicated magnetic field is formed. ing. Here, the state of information recorded on the information recording medium will be described.

FIG. 5 is a side view of essential parts for explaining an example of a state of information recorded on an information recording medium. The arrow in the figure indicates the magnetization direction.

During a normal write or erase operation, the magnetic head is driven by the current supplied from the current supply means controlled by the CPU of the system, but during the degaussing operation, an alternating current is supplied to the magnetic head. . By the way, when a dielectric is placed in a magnetic field M having a high strength as generated from a magnetic head, a hysteresis (history) phenomenon of the dielectric occurs.

FIG. 6 is a diagram showing an example of a hysteresis curve of a dielectric material. The horizontal axis H of the figure shows the external magnetic field, the vertical axis Pm shows the residual magnetic field, and P to U show the positions on the hysteresis curve.

When an external magnetic field in the positive direction is applied to the non-magnetized dielectric (point 0 in FIG. 6), the residual magnetic field Pm changes according to the magnitude of the external magnetic field H, as shown by the hysteresis curve in FIG. It changes and is saturated at the position of the point P corresponding to the magnitude of the external magnetic field Hc, and becomes maximum. In this state, when the external magnetic field H is reduced, the residual magnetic field Pm is also sequentially reduced along the hysteresis curve, and when the external magnetic field H becomes 0, the residual magnetic field having the magnitude of the point Q is generated.

Thereafter, when the external magnetic field H is changed in the negative direction, the residual magnetic field becomes 0 at the position of the point R (the external magnetic field is -H
(when c), and when it is further changed in the negative direction, it is saturated at the position of the point S and becomes the minimum. Even if the external magnetic field H is changed from the position of the point S to the positive direction and the external magnetic field H is set to 0, the residual magnetic field has the magnitude of the point T.

When the residual magnetic field changes the external magnetic field H in the positive direction from the size of the point T, the residual magnetic field becomes 0 again at the position of the point U, but the external magnetic field does not become 0. . As described above, the magnetization characteristic of the dielectric has a hysteresis curve. Therefore, once the dielectric is placed in the external magnetic field, even if the external magnetic field is set to 0 after that, the residual magnetic field does not reach the initial 0 state. Without returning, a residual magnetic field corresponding to 0Q or 0T in FIG. 6 is generated.

As a conventional method for eliminating such a residual magnetic field, there is known a degaussing method in which an alternating magnetic field is applied and the strength thereof is gradually reduced, that is, an alternating degaussing method. This conventional AC degaussing method will be described with reference to FIGS. 7 and 8 below.

FIG. 7 is a diagram showing an example of a degaussing current by the conventional AC degaussing method. The horizontal axis T in the figure represents time, and the vertical axis I represents the degaussing current. FIG. 8: is a figure explaining an example of the degaussing process by the conventional alternating current degaussing method. The horizontal axis H in the figure is the external magnetic field,
The vertical axis Pm represents the residual magnetic field.

In the conventional magneto-optical disk device, in order to generate an alternating magnetic field, a coil is wound around a core portion made of a dielectric material forming a magnetic head, and the current supply means is connected to this coil as shown in FIG. An alternating current that gradually attenuates is applied. In this way, the external magnetic field is generated by passing the alternating current through the coil of the magnetic head, and the residual magnetic field of the core is gradually reduced as shown in FIG.

However, in the magneto-optical disk device, in addition to the magnetic head, an actuator (condensing means)
Since the magnetic field from the magnetic head is also applied to the metal part of the above and the rail which is the movement axis of the actuator, residual magnetization exists. The conventional AC degaussing method is not very effective for degaussing dielectrics other than these magnetic heads.

However, the dielectric material having residual magnetization adsorbs foreign matter such as charged dust and dirt contained in the air, and is adsorbed when the magnetization direction changes between writing and erasing. The operation of releasing dust etc. is repeated.

As a countermeasure against such dust, many cleaning cartridges have been conventionally proposed. Also,
An optical disk drive device that adsorbs charged dust by a dust collecting electrode installed in the device has also been proposed (for example,
JP-A-3-144989).

That is, the dust collecting electrode is provided around the opening of the cartridge, and the charged dust is adsorbed by applying a predetermined voltage to the dust collecting electrode. However, although the conventional dust-proof measures by the cleaning cartridge and the dust collecting electrode are effective against dust floating in the air, etc., against dust already adsorbed on the magnetized dielectric. There was an inconvenience that it did not work effectively.

[0017]

SUMMARY OF THE INVENTION The present invention solves such inconveniences that occur in the conventional magneto-optical storage device, realizes inexpensively means for demagnetizing the dielectric etc. of the actuator, and takes measures against dust and the like. An object of the present invention is to provide a magneto-optical storage device which improves the reliability of the operation of the device by increasing the effectiveness and reducing the amount of dust floating around the lens, which is vulnerable to dust and the like.

[0018]

According to the present invention, firstly,
A device for recording / erasing information by irradiating a rotating recording medium with a laser beam while applying a vertical magnetic field, and supplying a magnetic head that generates the magnetic field and a current to the magnetic head. Current supply means, control means for controlling the current supply means according to recording / erasing of information, AC component applying means for applying an AC component to the current supplied to the magnetic head, and the laser beam on the recording medium. In a device comprising a condensing means for condensing the recording / erasing point and a moving means for moving the condensing means, supplying the alternating current applied by the alternating component applying means to the magnetic head. The focusing means is moved within the alternating magnetic field generated by the.

Secondly, in a device for recording / erasing information by irradiating a rotating recording medium with a laser beam while applying a vertical magnetic field, the laser beam is recorded / erased on the recording medium. Focusing means for focusing on a point, lens focus direction driving means for driving the lens of the focusing means in the focusing direction, and lens focus direction driving section degaussing means for erasing residual magnetization of the lens focusing direction driving means,
And demagnetizing the residual magnetization of the lens focus direction drive unit by the lens focus direction drive unit demagnetization unit.

Thirdly, in the above-mentioned second magneto-optical storage device, the lens focus direction drive unit demagnetizing means has a function of applying an AC component to the current supplied to the lens focus direction driving means. is there.

Fourth, in a device for recording / erasing information by irradiating a rotating recording medium with a laser beam while applying a vertical magnetic field, recording / erasing the laser beam on the recording medium. Focusing means for focusing on a point, lens track direction driving means for driving the lens of the focusing means in the track direction of the recording medium, and lens track direction driving section degaussing for eliminating residual magnetization of the lens track direction driving means. And a means for demagnetizing the residual magnetization of the lens track direction drive means by the lens track direction drive part demagnetization means.

Fifth, in the fourth magneto-optical storage device, the lens track direction drive unit demagnetizing means has a function of applying an AC component to the current supplied to the lens track direction driving means. is there.

Sixth, the second or fourth magneto-optical storage device is provided with a lens driving limit control means for limiting the driving of the lens of the light collecting means.

Seventh, in a device for recording / erasing information by irradiating a rotating recording medium with a laser beam while applying a vertical magnetic field, the laser beam is recorded / erased on the recording medium. Focusing means for focusing on a point, moving means for moving the focusing means, a rail made of a dielectric which is a moving axis of the moving means, and a rail demagnetizing means for demagnetizing residual magnetization of the dielectric rail, It has a configuration including and.

Eighth, in the above-described first, second, fourth, or seventh magneto-optical storage device, the cleaning cartridge used with the magneto-optical storage device has all or one of the dust-adsorbing portions incorporated therein. The part is made of a ferromagnetic material.

[0026]

According to the present invention, in order to degauss the dielectric or the like of the actuator, the actuator is moved into the AC magnetic field generated by the magnetic head to degauss, so that the dielectric of the actuator (metal part ) Is also degaussed to intentionally release charged dust and the like, and to remove dust and the like adsorbed by the residual magnetization of the dielectric (invention of claim 1). In addition, by demagnetizing the remanent magnetization generated by the magnetic field of the focus coil, the dust and the like adsorbed by the remanent magnetization of the metal part around the focus coil is intentionally released, and is attracted to the ferromagnetic material around the coil. After the demagnetization, the dust or the like adsorbed is reduced (the invention of claim 2).

In this case, by using the existing lens focus direction driving means as the degaussing means, it is possible to degauss the lens focus direction driving part without providing a new degaussing mechanism (claim 3). invention). Similarly, demagnetizing the remanent magnetization generated by the magnetic field of the track coil to intentionally release the dust and the like adsorbed by the remanent magnetization of the metal part around the track coil and adsorb it to the ferromagnetic material around the coil. Thus, after demagnetization, the dust or the like adsorbed is reduced (the invention of claim 4).

In this case, by using the existing lens track direction driving means as the degaussing means, it is possible to demagnetize the lens track direction driving portion without providing a new degaussing mechanism (claim 5). invention). Next, in order to limit the drive range of the lens of the actuator, a lens drive limiting means is provided to prevent destruction of the actuator which may occur when demagnetizing by passing an alternating current through the lens drive means. Invention of 6).

Further, by demagnetizing the dielectric rail which is the moving shaft for moving the actuator, the dust and the like adsorbed by the residual magnetization of the dielectric rail is intentionally discharged, and a strong force near the rail is generated. By adsorbing to a magnetic material, the dust or the like adsorbed after demagnetization is reduced (the invention of claim 7). Finally, by constructing a part or all of the media built in the cleaning cartridge with a ferromagnetic material, the charged dust and the like released by the degaussing operation and floating in the air can be efficiently adsorbed to the outside of the device. (The invention of claim 8).

[0030]

Embodiment 1 Next, an embodiment of the magneto-optical storage device of the present invention will be described in detail with reference to the drawings. This embodiment mainly corresponds to the invention of claim 1, but claim 2
Therefore, it relates to the invention of claim 8.

FIG. 1 is a partially cutaway side view showing an embodiment of the main configuration around the magnetic head of the magneto-optical storage device of the present invention. In the figure, 1 is a magnetic head, 1a is its core (dielectric), 1b is a coil, 2 is a current supply means, 3 is an AC component applying means, 4 is a CPU, 5 is an actuator (light collecting means), 5a is a condenser lens, 5
b is a lens protection plate, 5c is a magnet, 6 is an actuator moving rail, 7 is an information recording medium, SW is a switch, arrow M1 is a magnetic field, arrow A is the moving direction of the condenser lens 5a, and arrows B and C are The movement direction of the actuator 5 is shown.

The magneto-optical storage device of the present invention shown in FIG. 1 has basically the same configuration as the conventional device except that an AC component applying means 3 is added. First, the configuration and operation common to the conventional one will be described.

The magnetic field M1 generated from the magnetic head 1 is applied onto the information recording medium 7 to bring the condenser lens 5 to the target recording position.
By irradiating the laser beam focused by a to raise the temperature, the magnetization direction is changed for each pit of the information recording medium and the information is recorded, as described above with reference to FIG. During normal write and erase operations, CP
The magnetic head 1 is driven by the current supplied from the current supply unit 2 controlled by U4, but during the degaussing operation, the AC component application unit 3 is connected to the current supply unit 2 and
An alternating current is supplied to the magnetic head 1.

In this case, as described above with reference to FIG. 6, an external magnetic field is generated by passing an alternating current through the coil 1b, and as shown in FIG.
The residual magnetic field of is gradually reduced. The above operation is similar to that of the conventional device.

In the magneto-optical storage device of the present invention, the magnetic head 1 is used as the AC current generating means, and the actuator 5 is set in the AC magnetic field M1.
In addition to degaussing, the dielectric part of the actuator 5, such as the lens protection plate 5b made of a dielectric, is degaussed (the invention of claim 1). As described above, in order to demagnetize the dielectric substance of the actuator 5 and the like, the actuator 5 is moved into the AC magnetic field M1 generated by the magnetic head 1 to perform the degaussing operation. The dielectric (metal) portion is also demagnetized to intentionally release charged dust and the like, and eliminate dust and the like adsorbed by the residual magnetization of the dielectric.

[0036]

Second Embodiment Next, a second embodiment of the magneto-optical storage device of the present invention will be described. This embodiment mainly corresponds to the inventions of claims 2 and 3. Normally, in the magneto-optical storage device, the magnetic head 1 is also used for driving the condenser lens 5a.
The magnetic field M1 generated by the coil 1b is often used.

However, in the second embodiment, a means for demagnetizing the residual magnetization of the actuator 5 is provided in the vicinity of the actuator 5, and in the second embodiment in the vicinity of the actuator 5 shown in FIG. Provided (the invention of claim 2). Further, it is characterized in that a lens focus direction drive means for driving the lens in the focus direction is provided and the magnetic field generated by the lens focus direction drive means is utilized (the invention of claim 3).

FIG. 2 is a partially cut-away side view showing an embodiment of the main configuration around the actuator of the magneto-optical storage device of the present invention. Reference numerals in the figure are the same as those in FIG. 1, 11 is a focus coil, 12 is a dielectric, 13 is a lens drive limiting means, M2 is a magnetic field by the focus coil 11, and M3 is a magnetic field by the magnet 5c.

The magnetic field M2 generated by the focus coil 11 shown in FIG. 2 magnetizes the dielectric 12 inside the actuator 5, the lens protection plate 5b and the like. The residual magnetization in this case adsorbs charged dust or the like in the air when the apparatus is not operating, and releases or adsorbs dust when a current flows through the focus coil 11 and the magnetization direction changes.

Therefore, at the time of degaussing operation, the output of the AC component applying means 3 shown in FIG. 1 is connected to the focus coil 11 shown in FIG. The residual magnetic field is demagnetized (the invention of claim 3). Thus, by providing demagnetizing means for demagnetizing the residual magnetization of the actuator in the vicinity of the actuator or demagnetizing the residual magnetization of the actuator using the focus coil 11 of the actuator, dusts and the like near the lens are discharged. , It is possible to reduce dust adsorbed after demagnetization.

[0041]

[Third Embodiment] A third embodiment of the magneto-optical storage device of the present invention will be described.
An example will be described. This embodiment mainly corresponds to the inventions of claims 4 and 5. In the second embodiment described above, the case has been described in which the lens focus direction drive means for driving the lens in the focus direction is provided, and demagnetization in the vicinity of the actuator is performed by the lens focus direction drive means.

In the third embodiment, paying attention to the lens track direction driving means for driving the lens in the track direction, the residual magnetization of the dielectric 12 and the lens protection plate 5b inside the actuator is similarly demagnetized. Although not particularly shown,
Similar to the lens focus direction driving means of FIG. 2, the magnetic field generated by the track coil of the lens track direction driving means also causes residual magnetization in the dielectric 12 and the lens protection plate 5b inside the actuator.

Therefore, a means for demagnetizing the residual magnetization generated in the track coil of the lens track direction driving means is provided near the actuator (light collecting means) 5 (the invention of claim 4). Alternatively, the demagnetizing AC magnetic field is generated by the track coil itself of the lens track direction driving means (the invention of claim 5).

[0044]

[Fourth Embodiment] A fourth embodiment of the magneto-optical storage device of the present invention will be described.
An example will be described. This embodiment corresponds to the invention of claim 6. The condenser lens 5a described in the second embodiment above.
When the degaussing is performed by the focus coil used for driving, or the track coil of the condensing lens 5a described in the third embodiment, an alternating current flows through the coil, so that the degaussing magnetic field generated causes the condensing lens 5a. Will be driven.

Therefore, the lens driving means may be destroyed depending on the strength and frequency of the applied alternating current. Therefore, in the fourth embodiment, the condenser lens 5a
When the degaussing operation is performed by using the driving means, the lens driving means is restricted so that the lens driving means is not destroyed (the invention of claim 6).

An example is shown in FIG. 2 above. That is, by adding the lens drive limiting means 13 as shown in FIG. 2, the moving range of the condenser lens 5a during the demagnetizing operation of the lens driving means is limited.

[0047]

[Embodiment 5] A fifth embodiment of the magneto-optical storage device of the present invention will be described.
An example will be described. This embodiment corresponds to the invention of claim 7. In the magneto-optical storage device shown in FIG. 1 above,
The moving rail 6, which is the moving shaft of the moving means of the actuator 5, is also likely to be affected by the magnetic fields from the magnetic head 1, the focus coil (11 in FIG. 2), and the track coil (not shown). .

That is, generally, the moving rail 6 is often made of a dielectric material such as iron because of its strength and friction. Therefore, it is easily affected by the external magnetic field and residual magnetization exists. In the fifth embodiment, the residual magnetization of the moving rail 6 is demagnetized.

FIG. 3 is a partially cutaway side view showing a third embodiment of the essential structure of the magneto-optical storage device of the present invention. The reference numerals in the figure are the same as those in FIG. 1, and
Reference numeral 21 is a demagnetizing means of the rail for moving the actuator, 22 is a coil thereof, and 23 is an AC component applying means.

In the third embodiment, by providing the demagnetizing means 21 of the actuator moving rail as shown in FIG. 3 in the magneto-optical storage device of the first embodiment shown in FIG. This is a configuration for demagnetizing the moving rail 6. As a specific example, the moving rail 6 is used as a core, a coil 22 is wound on the outside thereof, and an alternating current is caused to flow from the alternating component applying means 23 to the coil 22 to generate an alternating magnetic field. The residual magnetization of the rail 6 is demagnetized.

[0051]

Sixth Embodiment Finally, a sixth embodiment of the magneto-optical storage device of the present invention will be described. This embodiment provides claim 8.
Corresponding to the invention of. The magneto-optical storage device according to any one of claims 1 to 7 described above also has a purpose of discharging charged dust or the like adsorbed by the residual magnetization of the dielectric.

In this case, the discharged dust or the like will eventually have a strong magnetization 5 which is not affected by the operation of the apparatus.
Although it is adsorbed by c, it is basically desirable to remove it from the device to the outside. The sixth embodiment is characterized in that a cleaning cartridge for adsorbing charged dust and the like floating in the air is used.

FIG. 4 is a diagram showing a fourth embodiment of the essential structure of the magneto-optical storage device of the present invention.
(2) is a top view of the medium in the cleaning cartridge. In the figure, the vertical stripes indicate a ferromagnetic material.

As shown in FIGS. 4 (1) and 4 (2), the medium containing the cleaning cartridge is made of a ferromagnetic material and is used in combination with the demagnetizing means of the magneto-optical storage device shown in FIGS. By doing so, it is possible to efficiently remove dust and the like released into the air due to the degaussing operation without suspending it in the device.

[0055]

According to the magneto-optical storage device of the present invention, since the actuator is demagnetized by moving it into the alternating magnetic field generated by the magnetic head, the demagnetization of the magnetic head and the demagnetization of the metal portion of the actuator are simultaneously performed. It will be possible to do. Therefore, by intentionally releasing the charged dust or the like, it is possible to remove the dust or the like adsorbed to the remanently magnetized portion of the dielectric.

In the magneto-optical storage device of the second aspect, the residual magnetization generated by the magnetic field of the focus coil is demagnetized. Therefore, by releasing the dust or the like adsorbed by the residual magnetization of the metal portion around the focus coil, the dust or the like can be adsorbed to the ferromagnetic material near the coil and, after the demagnetization operation, the dust or the like adsorbed is reduced. You can also

According to the magneto-optical storage device of claim 3, claim 2
In the magneto-optical storage device, the existing lens focus direction driving means is used as the degaussing means. Therefore, it is possible to degauss the lens focus direction drive unit without providing a new degaussing mechanism.

In the magneto-optical storage device of the fourth aspect, the residual magnetization generated by the magnetic field of the track coil is demagnetized. Therefore, by releasing the dust or the like adsorbed by the residual magnetization of the metal portion around the track coil, the dust or the like can be adsorbed to the ferromagnetic material near the coil and, after the degaussing operation, the dust or the like adsorbed is reduced. You can also

According to the magneto-optical storage device of claim 5, claim 4
In the magneto-optical storage device, the existing lens track direction driving means is used as the degaussing means. Therefore, the lens track direction drive unit can be demagnetized without the need to newly provide a degaussing mechanism.

According to the magneto-optical storage device of claim 6, claim 2
Alternatively, in the magneto-optical storage device according to the fourth aspect, there is provided lens drive limiting means for limiting the drive of the lens of the actuator which is the light collecting means. Therefore, it is possible to prevent the device from being broken due to an abnormal operation of the condensing unit which may occur when the lens drive unit is supplied with an alternating current and demagnetized.

In the magneto-optical storage device according to the seventh aspect, the moving means for moving the actuator which is the light collecting means, that is, the dielectric rail is demagnetized. Therefore, by releasing the dust or the like adsorbed on the dielectric rail, it can be adsorbed on the ferromagnetic material near the rail, and the dust or the like adsorbed after the degaussing operation can be reduced.

In the magneto-optical storage device of claim 8, a part or all of the medium contained in the cleaning cartridge used in the magneto-optical storage device of claim 1, claim 2, claim 4, or claim 7 is enhanced. It is made of magnetic material. Therefore, it is possible to efficiently adsorb charged dust and the like that are released by the degaussing operation and are floating in the air,
Can be discharged from the device.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing an embodiment of a main part configuration around a magnetic head of a magneto-optical storage device of the present invention.

FIG. 2 is a partially cutaway side view showing an embodiment of a main part configuration around the actuator of the magneto-optical storage device of the present invention.

FIG. 3 is a partially cut-away side view showing a third embodiment of the essential configuration of the magneto-optical storage device of the present invention.

FIG. 4 is a diagram showing a fourth embodiment of the essential configuration of the magneto-optical storage device of the present invention.

FIG. 5 is a side view of essential parts for explaining an example of a state of information recorded on an information recording medium.

FIG. 6 is a diagram showing an example of a dielectric hysteresis curve.

FIG. 7 is a diagram showing an example of a degaussing current by a conventional AC degaussing method.

FIG. 8 is a diagram illustrating an example of a degaussing process by a conventional AC degaussing method.

[Explanation of symbols]

 1 Magnetic Head 1a Core Part 1b Coil 2 Current Supply Means 3 AC Component Applying Means 4 CPU 5 Actuator 5a Condensing Lens 5b Lens Protective Plate 5c Magnet 6 Actuator Moving Rail 7 Information Recording Medium 11 Focus Coil 12 Dielectric 13 Lens Driving Limit Means 21 Demagnetizing means for moving actuator rail 22 Coil 23 AC component applying means

Claims (8)

[Claims] 1. A device for recording / erasing information by irradiating a rotating recording medium with a laser beam while applying a vertical magnetic field, the magnetic head generating the magnetic field, and the magnetic head. Current supply means for supplying a current to the magnetic head, control means for controlling the current supply means according to recording / erasing of information, AC component applying means for applying an AC component to the current supplied to the magnetic head, and the laser. In a device comprising a condensing means for condensing light on a recording / erasing point on a recording medium, and a moving means for moving the condensing means, the alternating current applied by the alternating component applying means is used for the magnetic field. A magneto-optical storage device characterized in that the condensing means is moved within an alternating magnetic field generated by supplying the head. 2. An apparatus for recording / erasing information by irradiating a rotating recording medium with a laser beam while applying a vertical magnetic field, wherein the laser beam is applied to a recording / erasing point on the recording medium. Converging means for condensing, lens focus direction driving means for driving the lens of the condensing means in the focusing direction, and lens focus direction driving part demagnetizing means for erasing residual magnetization of the lens focus direction driving means. A magneto-optical storage device, comprising: demagnetizing the residual magnetization of the lens focus direction drive unit by the lens focus direction drive unit demagnetization unit. 3. The magneto-optical storage device according to claim 2, wherein the lens focus direction drive degaussing means has a function of applying an AC component to a current supplied to the lens focus direction drive means. Magneto-optical storage device. 4. An apparatus for recording / erasing information by irradiating a rotating recording medium with a laser beam while applying a vertical magnetic field, wherein the laser beam is applied to a recording / erasing point on the recording medium. A condensing means for condensing, a lens track direction driving means for driving the lens of the condensing means in the track direction of the recording medium, a lens track direction driving section demagnetizing means for erasing the residual magnetization of the lens track direction driving means, And a demagnetizing means for deactivating the lens track direction drive section for demagnetizing the residual magnetization of the lens track direction drive means. 5. The magneto-optical storage device according to claim 4, wherein the lens track direction drive unit degaussing means has a function of applying an AC component to a current supplied to the lens track direction drive means. Magneto-optical storage device. 6. The magneto-optical storage device according to claim 2 or 4, further comprising a lens drive limiting means for limiting the drive of the lens of the condensing means. 7. An apparatus for recording / erasing information by irradiating a rotating recording medium with a laser beam while applying a vertical magnetic field, wherein the laser beam is applied to a recording / erasing point on the recording medium. A condensing means for condensing, a moving means for moving the converging means, a rail made of a dielectric which is a moving axis of the moving means, and a rail demagnetizing means for demagnetizing the residual magnetization of the dielectric rail. A magneto-optical storage device characterized by being provided. 8. The magneto-optical storage device according to claim 1, 2 or 4, or 7, wherein the cleaning cartridge used together with the magneto-optical storage device has all or a portion of a dust adsorption portion incorporated therein. Partly
A magneto-optical recording device comprising a ferromagnetic material.