JPH09147437A - Cleaning disk, its disk cartridge and magneto-optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cleaning disk capable of cleaning a slide surface of a magnetic field applying head, its disk cartridge and a magneto-optical disk device. SOLUTION: This cleaning disk 3B for forming a cleaning layer 310 directly on a surface of a substrate 210 or the surface of a magnetic recording layer 220 formed on the surface is housed in the cartridge, and the cleaning disk cartridge making its inner wall an adhesive inner wall is inserted into the magneto-optical disk device to be loaded, and the slide surface of the magnetic field applying head is cleaned by the cleaning disk cartridge.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention particularly relates to a cleaning disk for cleaning a magnetic field applying head of a magneto-optical disk apparatus for recording / reproducing information signals by a magnetic field modulation overwrite method, a disk cartridge therefor and a magneto-optical disk. It relates to the device.

[0002]

2. Description of the Related Art Generally, a magneto-optical disk device is known as a disk device for writing and / or reading an information signal to / from a magneto-optical disk rotatably mounted in a disk cartridge.

This magneto-optical disk device holds a cartridge loading mechanism having a cartridge holder for holding a disk cartridge, and a spindle motor for rotating the magneto-optical disk and a magneto-optical disk provided below the cartridge loading mechanism. A rotating mechanism having a disc table, an optical pickup device provided behind the rotating mechanism and having an objective lens, an external magnetic field generating device having a magnetic field applying head provided above the optical pickup device, and a disc cartridge. When the optical pickup device and the external magnetic field generator are evacuated (unloaded state) when they are conveyed to a predetermined cartridge mounting position in the body of the magneto-optical disk device, and are brought into contact with the magneto-optical disk,
Alternatively, it is roughly composed of a loading / unloading device of a magnetic field applying head for facing each other with a minute gap (a loading state), and an elevating mechanism for elevating a rotating mechanism provided in front of the external magnetic field generating device and the optical pickup device. Has been done.

In the magneto-optical disk device thus constructed, when the disk cartridge is pulled into the predetermined cartridge mounting position in the body of the magneto-optical disk device, the magnetic field applying head is retracted and the magneto-optical disk is moved. When an information signal is written and read by using the above-mentioned mounting position, the optical pickup device and the magnetic field applying head are opposed to each other at a predetermined position of the magneto-optical disk rotating at the mounting position, and a desired information signal is recorded and reproduced. . As the loading / unloading device for the magnetic field applying head, for example, a device equipped with a piezoelectric actuator disclosed in Japanese Patent Laid-Open No. 3-104069 or a device equipped with a solenoid disclosed in Japanese Utility Model Laid-Open No. 3-80562 is adopted. Has been done.

These are provided on the carriage where the magnetic field applying head moves back and forth with respect to the track position of the magneto-optical disk, or on the fixed portion of the magneto-optical disk apparatus main body.
The magnetic field applying head is loaded and unloaded by energizing the piezoelectric actuator or the solenoid.

Next, an example of a magneto-optical disk used in the magneto-optical disk device will be described with reference to FIGS. 7 to 9. FIG. 7 is a perspective view of the disc cartridge including the magneto-optical disc as viewed from the upper half side, FIG. 8 is a perspective view of the disc cartridge shown in FIG. 7 as viewed from the lower half side, and FIG. It is a partial cross-sectional view of a magneto-optical disk.

First, the disk cartridge will be described with reference to FIGS. 7 and 8. This disc cartridge 1
It is composed of a magneto-optical disk 2 formed in a disk shape and a cartridge 101 that rotatably accommodates the magneto-optical disk 2.

Of these, a magnetic recording layer 220 (FIG. 9), which will be described later, is formed in the data recording area of the magneto-optical disk 2, and an information signal is written and / or written in the magnetic recording layer by magneto-optical means. Reading is performed. In this magneto-optical disk 2, one main surface portion serves as a signal recording surface, and a disk-shaped chucking hub 201 made of a metal material is provided in the central portion of the disk.

On the other hand, the cartridge 101 comprises a pair of upper and lower half halves 102 and 103 having a substantially box shape having a sufficient space for accommodating the magneto-optical disk 2 therein. It is constructed by butting. The front surface portion 104 of the cartridge 101 is provided with a shutter opening member fitting portion 105 for fitting the shutter opening member of the cartridge holder to open the cartridge opening portion.
A cartridge pull-in pin fitting hole 107 into which a cartridge hold pin is fitted is provided from the front of 06.

In the lower half 103 of the cartridge 101, a cartridge positioning pin engaging hole 1 with which a cartridge positioning pin for horizontally positioning the disk cartridge 1 in the main body of the magneto-optical disk device is engaged.
Nos. 08 and 109 are provided, and the magneto-optical disk 2 is provided in the vicinity of the cartridge positioning pin engagement hole 226.
An erroneous erasure prevention member 110 is provided for selecting whether or not to write an information signal to the. Further, the lower half 103 is provided with a part of the signal recording surface of the magneto-optical disk 2 and the chucking hub 201 outside the cartridge 101, and a first opening 111.

The first opening 111 is located substantially in the center in the left-right direction between the one side surface 106 and the other side surface 112 of the cartridge 101, and in the center in the cartridge front-rear direction from the front surface 104 side of the cartridge 101. When the disc cartridge 1 is mounted in the magneto-optical disc device main body, the chucking hub 201 is exposed to the disc table of the disc rotation drive mechanism, and the magneto-optical disc is formed. The second signal recording surface faces the objective lens of the optical pickup device.

The upper half 102 is provided with a second opening 113 located near the front surface 104 of the cartridge 101 and corresponding to the first opening 111. The second opening 113 is formed as a rectangular opening in plan view that is large enough to expose a part of the other main surface of the magneto-optical disk 2 to the outside of the cartridge 101. Is configured so that the other main surface portion of the magneto-optical disk 2 faces the magnetic field applying head when mounted in the main body of the magneto-optical disk device.

The front portion 1 of the cartridge 101
04, a notch recess 111a for allowing the magnetic field applying head and the optical pickup device to easily enter the main surface portions of the magneto-optical disk 2 in close proximity to each other at the portions corresponding to the openings 111, 113. , 113a
Is provided. That is, the thickness of the central portion of the cartridge 101 in the vicinity of the front surface portion 104 is equal to that of the first opening portion 111.
Also, the thickness corresponding to the second opening 113 is set to be thin.

The cartridge 101 has a shutter member 114 for opening and closing the openings 111 and 113.
Are slidably mounted. This shutter member 1
14 is provided in parallel to the first shutter plate portion 115 that closes the first opening portion 111 of the lower half 103 and the second opening portion 113 of the upper half 102. Second shutter plate portion 116 for covering
And a connecting piece 117 for connecting the base end portions of the second shutter plate portion 116 and the first shutter plate portion 115.
It is composed of

Of these, the first shutter plate portion 115
Is formed as a rectangular body narrow enough to close the first opening 111. A tip portion of the first shutter plate portion 115 is pressed and supported by a shutter pressing plate 118, whereby the cartridge 101
Lifting from the ground is prevented. On the other hand, the second shutter plate portion 116 is formed as a wide rectangular body having a size sufficient to close at least the second opening 113.

The thickness of the connecting piece 117 is set to be substantially equal to the thickness of the thin center portion of the cartridge 101. In addition, the connecting piece 117 and the cartridge 101 are provided with a torsion coil spring (not shown) that constantly biases the shutter member 114 in the direction of closing the first opening 111 and the second opening 113. Each spring end (shown) is locked.

The arrow X in the figure indicates the shutter member 11.
Reference numeral 4 indicates a direction of movement between a position where the both opening portions 111 and 113 are closed and a position where both the opening portions 111 and 113 are opened.

The magneto-optical disc 2 mounted in the disc cartridge 1 is made of a polycarbonate material having a thickness of, for example, about 0.8 mm to 1.2 mm, as shown in FIG. And a magnetic recording layer 220 formed on the surface of the substrate 210 with a thickness of several μm, and further with abrasion resistance, corrosion resistance, and lubricity formed on the surface of the substrate 210 with a thickness of several μm to 20 μm. A protective film layer 230 for protecting the magnetic recording layer 220, which is rich in ultraviolet light and has an effect of preventing ultraviolet rays.

The magnetic recording layer 220 is further multi-layered. As shown in the enlarged view of FIG. 9B, first,
The first silicon nitride film layer (Si ₃ N ₄ ) 221 is formed on the surface of the substrate 210 to a thickness of about 400Å, and the surface of the silicon nitride film layer 221 is formed to a thickness of about 200 to 300Å. Rare earth graduation metal (RE-TM) having a magneto-optical effect (Kerr effect) formed, for example,
MO film layer 22 of terbium iron cobalt (TbFeCo)
2, a second silicon nitride film layer 223 formed on the surface of the MO film layer 222 with a thickness of about 1100Å, and an aluminum film layer 224 formed on the surface of the second silicon nitride film layer 223 with a thickness of about 700Å. It consists of and.

When recording an information signal on the magneto-optical disk 2 having such a structure, as described above, the disk cartridge 1 in which the magneto-optical disk 2 is mounted is inserted into the cartridge insertion port of the magneto-optical disk device. By inserting, the magnetic field applying head is retracted, the first shutter plate portion 115 and the second shutter plate portion 116 are opened, and the disc cartridge 1 is pulled into a predetermined cartridge mounting position in the main body, and the magneto-optical disc is obtained. The second chucking hub 201 is magnetically attracted to the turntable of the spindle motor to be fixed and held, and when writing and reading an information signal to and from the magneto-optical disc, the spindle motor is rotating at the mounting position. The optical pickup device and the magnetic field applying head face each other at a predetermined position of the magneto-optical disk 2, The information signal recording operates to reproduce.

[0021]

By the way, as described above, since the disc cartridge 1 is frequently attached to and detached from the magneto-optical disc device, there is an opportunity to mix various dusts into the magneto-optical disc device. is there. In the worst case, as shown in FIG. 10, the mixed dust D adheres to the sliding surface of the magnetic field applying head 60 of the flying head system, and the dust D adheres to the protective film layer 230.
The protective film layer 230
To damage the magnetic recording layer 220 of the magneto-optical disk 2, and also the magnetic field applying head 60 and the magnetic recording layer 22.
When the dust D is drawn into the air film formed in the minute gap with 0 and sandwiched between the two and is not removed, the dust D is dragged and the magneto-optical disc 2
The surface of the magneto-optical disk 2 while the dust D is being sandwiched between the sliding surface 62 and the surface of the magneto-optical disk 2.
A so-called head clog sometimes occurred that the machine stopped rotating. The magnetic field applying head 60 has a sliding surface that is the same as the surface of the slider 61, and the "sliding surface of the magnetic field applying head 60" described here is a combination of the two sliding surfaces. The "sliding surface" is referred to as "sliding surface 62". Reference numeral 63 is a spring that elastically supports the slider 61.

Further, even if the dust D attached to the sliding surface 62 of the magnetic field applying head 60 is removed, the removed dust D is hard to be discharged to the outside from the inside of the substantially closed cartridge, and the magnetism of the magneto-optical disk 2 is reduced. Reattach to the surface of the recording layer,
In the worst case, the above head clog may occur again.

Therefore, an object of the present invention is to eliminate such drawbacks, and the information signal is recorded on the magneto-optical disk while the surface of the magnetic field applying head is always kept in a normal state. Another object of the present invention is to obtain a cleaning disk capable of preventing damage to a magneto-optical disk on which an important information signal is recorded, a disk cartridge for the cleaning disk, and a magneto-optical disk device.

[0024]

Therefore, the cleaning disk of the present invention can be applied directly to the surface of a substrate having a predetermined thickness.
Alternatively, the surface of the magnetic recording layer formed on the surface thereof is uniformly coated with an abrasive to solve the above-mentioned problems.

Further, in the cleaning disk cartridge of the present invention, the cleaning disk is rotatably mounted in the cartridge, and when cleaning the magnetic field applying head of the magneto-optical disk apparatus, the cleaning disk is mounted on the rotating cleaning disk. The above problem is solved by forming the inner wall of the cartridge, which is present at least on the downstream side of the contact position of the magnetic field applying head, with an adhesive inner wall.

Furthermore, in the magneto-optical disk device of the present invention, the magnetic field applying head automatically rotates when the cleaning disk cartridge in which the cleaning disk is rotatably mounted is mounted in the magneto-optical disk device. The above-mentioned problem is solved by providing a cleaning means which comes into contact with the polishing layer of the cleaning disk therein and automatically releases the contact after a lapse of a predetermined time.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION Next, the cleaning disk, the disk cartridge and the magneto-optical disk apparatus of the present invention will be described with reference to FIGS. FIG. 1 is a partially enlarged sectional view of a cleaning disc according to a first embodiment of the present invention, and FIG. 2 is a partially enlarged sectional view of a cleaning disc according to a second embodiment of the present invention.
FIG. 3 is a block diagram of a cleaning system when the magnetic field applying head is cleaned using the magneto-optical disk of the first embodiment shown in FIG. 1, and FIG. 4 is a block diagram of the second embodiment shown in FIG. FIG. 6 is a system circuit block diagram of a cleaning disc identifying apparatus of the present invention when a magnetic field applying head is cleaned using a magneto-optical disc, FIG. 5 is an operation flowchart of the cleaning disc identifying apparatus shown in FIG. 4, and FIG. 6 shows a conceptual cleaning disk cartridge which is an embodiment of the present invention. FIG. 6A is a sectional view thereof, and FIG. 6B is a partially enlarged sectional view of FIG. In addition, a conventional magneto-optical disk,
The same parts as those of the disk cartridge and the magneto-optical disk device will be described with the same reference numerals.

First, referring to FIG. 1, the first aspect of the present invention will be described.
The cleaning disk according to the embodiment will be described. The cleaning disk 3A is a disk-shaped substrate 210 having the same material and size as the substrate 210 of the magneto-optical disk 2.
The disk has a cleaning layer 310 formed on its surface. The cleaning layer 310 is made of, for example, silicon carbide (SiC), alumina (Al ₂ O ₃ ), chromium dioxide (Cr ₂ O ₃ ), iron dioxide (Fe ₂ O ₃ ), or the like as an abrasive, and is several tens μm to several hundreds μm. It is advisable to form a film with a certain thickness.

Further, instead of the abrasive, for example, a thin film non-woven fabric made of polyester resin is used as the cleaning layer 310.
Alternatively, the cleaning disk 3A may be formed by adhering it to the surface of the substrate 210. The cleaning disk 3A of this embodiment can be manufactured at low cost because there is no need to form the magnetic recording layer 220.

The cleaning disk 3B of the second embodiment shown in FIG. 2 has a cleaning layer 310 instead of the protective film layer 230 of the magneto-optical disk 2 shown in FIG. Also in this case, the cleaning layer 310 of the cleaning disk 3A is used as the cleaning layer 310.
The same abrasive or non-woven fabric can be used. Then, the magnetic recording layer 220 of the cleaning disk 3B
At this time, an identification signal indicating that this disc is a cleaning disc is recorded. The cleaning disk 3B can be manufactured at low cost by using the same manufacturing equipment used in the manufacturing process of the magneto-optical disk 2 shown in FIG.

Next, the operation of cleaning the magnetic field applying head 60 using the cleaning disks 3A and 3B will be described with reference to FIG. First, the case of cleaning the magnetic field applying head 60 using the cleaning disk 3A will be described. The cleaning disc 3A according to the first embodiment is not provided with an identification signal indicating what type of disc it is.
Therefore, the cleaning disc 3A is a cleaning disc that is preferably used when the magnetic field applying head 60 is preliminarily cleaned to complete the magneto-optical disc device manufactured in the magneto-optical disc device manufacturing factory. .

That is, the magneto-optical disk device 4 just before completion is connected to the host computer 5 at the manufacturing site. The host computer 5 gives a direct instruction command to the magneto-optical disk device 4. When the cleaning disc 3A is inserted into the magneto-optical disc device 4 and attached, the instruction command means to start driving a disc drive unit such as a spindle motor as usual, and a DSP (digital signal) of the disc drive unit. -Processor) is controlled as follows. That is, (1) the magnetic field applying head 60 is lowered (2) the magnetic field applying head 60 is kept for a predetermined time, for example, 30
Seek for 2 seconds (3) Automatically eject the cleaning disk 3A after completion of the seek These operation instructions (programs) are written in advance in a program ROM (hereinafter referred to as "PROM") of the host computer 5.

Therefore, this cleaning disk 3A
When the cleaning disk cartridge 70 (FIG. 6) in which the cartridge 101 is stored is inserted and mounted in the magneto-optical disk device 4, the magnetic field applying head 60 automatically causes the cleaning layer 310 on the surface of the cleaning disk 3A.
When the dust D adheres to the sliding surface 62 of the magnetic field applying head 60 by contacting with, the dust D can be removed. When the cleaning layer 310 is made of an abrasive material, the sliding surface 62 of the magnetic field applying head 60.
Is slightly polished, but when the cleaning layer 310 is made of a non-woven fabric, the sliding surface 62 of the magnetic field applying head 60 remains wiped.

Next, referring to FIGS. 4 and 5, the first
A case of cleaning the sliding surface 62 of the magnetic field applying head 60 using the cleaning disk 3B of the embodiment will be described. In FIG. 4, a disk drive unit 410 and a disk identification device 420, which are usually incorporated in the main body of the magneto-optical disk device 4, are extracted and shown.

The disk drive unit 410 is composed of a spindle motor 411 having a drive shaft 411A, a drive DSP 412 and the like. The drive DSP 412 performs drive control of the spindle motor 411, drive control of the magnetic field applying head 60 to be cleaned, and drive control of the optical pickup device 80. On the other hand, the disc identification device 4
Reference numeral 20 denotes a disc detection device 421 equipped with a disc detection sensor 421A for detecting various disc cartridges when they are inserted into the magneto-optical disc device 4 and installed.
And a controller device 422 connected to this output side
An identification signal detecting device 423 connected to the output side of the optical pickup device 80, and the identification signal detecting device 4
23 and a decoding device 424 connected to the controller device 422 on the output side. The controller device 422 has software programmed to operate the disk drive unit 410 and the like in a predetermined order, that is, a PROM 422A.
Is built-in.

Next, the cleaning operation of the magnetic field applying head 60 will be described with reference to FIG. When the cleaning disc cartridge 70 containing the cleaning disc 3B is inserted into the magneto-optical disc device 4 and mounted, the disc detection sensor 421A and the disc detection device 421 detect that the disc cartridge is mounted (step SP1). The detection signal is sent to the controller device 422, and based on the control signal from the controller device 422, the drive DSP 412 rotates the spindle motor 411 at a predetermined rotation speed, for example, 2400 rpm (step SP2), and the optical pickup device 80 is turned on. The identification signal recording surface of the disc cartridge is focused (step SP3).

When the optical pickup device 80 is focused, the identification signal is read by the identification signal detection device 423, and the mounted disc cartridge is the cleaning disc 3B or a normal disc cartridge, that is, a writable disc cartridge. There is
Decoding device 4 is a ROM disk cartridge
It is identified by 24 (step SP4), and the output is sent to the controller device 422.

If the identification signal indicates a writable disc cartridge, the magnetic field applying head 60 is lowered onto the surface of the writable disc under the control of the controller device 422 and the driving DSP 412 (step SP5). If the detected identification signal indicates that it is a ROM disk cartridge, the magnetic field application head 60 is not lowered under the control of the controller device 422 and the drive DSP 412 (step SP6).

As described above, since the identification signal for identifying the cleaning disc is recorded on the cleaning disc 3B in advance, when the cleaning disc cartridge 70 is inserted and mounted, the optical pickup is picked up. Since the identification signal detected by the device 80 indicates that it is the cleaning disk 3B, the magnetic field applying head 60 is lowered onto the surface of the cleaning disk 3B under the control of the controller device 422 and the drive DSP 412 (step SP7), and the spindle Motor 41
1 is rotated, the optical pickup device 80 is focused, and the magnetic field applying head 60 is sought for 30 seconds, for example (step SP8). In this way, the magnetic field applying head 6
By seeking 0, the sliding surface 62 of the magnetic field applying head 60 can be cleaned by the cleaning layer 310.

When the magnetic field applying head 60 finishes seeking for 30 seconds, the controller device 422 and the driving DSP 4
12 automatically ejects the cleaning disk cartridge (step SP9), and the spindle motor 41
The rotation of No. 1 is stopped, the magnetic field applying head 60 and the optical pickup device 80 are returned to the original standby positions, and the cleaning operation of the magnetic field applying head 60 is completed.

As described above, the sliding surface 62 of the magnetic field applying head 60 can be cleaned by the cleaning disk 3A or 3B, but the cleaning disk 3A or 3B rotates at a high speed. The dust D or the fine abrasive material scraped by polishing is blown off by the cleaning attached to the sliding surface 62 of the magnetic field applying head 60, and the dust D blown off
Is hard to be discharged from the narrow space inside the cartridge,
The cleaning layer 31 of the cleaning disk 3A or 3B is re-bounced by bouncing on the inner wall of the cartridge.
0 or the magnetic field applying head 60 may be attached to the sliding surface 62 and possibly damage the sliding surface 62.

In order to prevent this undesirable phenomenon,
The cleaning disk cartridge 70 shown in FIG.
Was invented. The cleaning disc cartridge 70 shown in FIG. 6 is obtained by accommodating the cleaning disc 3A or 3B in the cartridge 101 shown in FIGS. 7 and 8. The central portion of the chucking hub 701 of the cleaning disc cartridge 70 is shown in FIG. It is sectional drawing of the cut end cut | disconnected on the center line which passes.

FIG. 6 shows the cleaning disk cartridge 70 mounted and fixed on the drive shaft 411A of the spindle motor 411. When mounting and fixing the cleaning disk cartridge 70 on the spindle motor 411, the chucking hub 701 is used for the turntable 4 of the spindle motor 411.
It is performed in a state in which the cleaning disk 3A or 3B is attracted to a magnet 414 incorporated in the cleaning disk 3 and the central portion of the cleaning disk 3A or 3B is supported by the turntable 413.

This cleaning disk cartridge 70 is a cartridge which exists at least on the downstream side of the position where the magnetic field applying head 60 contacts the rotating cleaning disk 3A or 3B when the magnetic field applying head 60 is cleaned. On the inner wall of 101,
For example, a non-volatile adhesive is applied, and the adhesive inner wall 101A is used. Of course, the entire peripheral surface of the inner wall of the cartridge 101 or the entire peripheral surface and the entire upper and lower surfaces may be formed of an adhesive inner wall with an adhesive.

By using such a cleaning disk cartridge 70, when cleaning the sliding surface 62 of the magnetic field applying head 60, the dust D and fine abrasives adhered to the sliding surface 62 are cleaned. Even if the disk 3A or 3B is blown away by rotation, it adheres to the adhesive inner wall 101A, and the surface of the cleaning disk 3A or 3B or the sliding surface 6 of the magnetic field applying head 60.
It is possible to prevent the redeposition on the second layer.

[0046]

As described above, according to the cleaning disc of the present invention, the disc cartridge incorporating the same, and the magneto-optical disc device, the sliding surface of the magnetic field applying head can be easily cleaned. It is possible to prevent a disc on which various information signals are recorded from being damaged. Further, by keeping the sliding surface of the magnetic field applying head clean, the life of the magneto-optical disk device can be extended.

[Brief description of the drawings]

FIG. 1 is a partially enlarged sectional view of a cleaning disk according to a first embodiment of the present invention.

FIG. 2 is a partially enlarged sectional view of a cleaning disk according to a second embodiment of the present invention.

FIG. 3 is a block diagram of a cleaning system when the magnetic field applying head is cleaned using the magneto-optical disk of the first embodiment shown in FIG.

FIG. 4 is a system circuit block diagram of a cleaning disk identifying apparatus of the present invention when the magnetic field applying head is cleaned using the magneto-optical disk of the second embodiment shown in FIG.

5 is an operation flowchart of the cleaning disc identification device shown in FIG.

6A and 6B show a conceptual cleaning disk cartridge that is an embodiment of the present invention. FIG. 6A is a sectional view thereof, and FIG. 6B is a partially enlarged sectional view of FIG.

FIG. 7 is a perspective view of a disk cartridge having a built-in magneto-optical disk as viewed from the upper half side.

FIG. 8 is a perspective view of the disk cartridge shown in FIG. 7 viewed from the lower half side.

FIG. 9 is a partial sectional view of a magneto-optical disk.

FIG. 10 is a conceptual cross-sectional side view showing a state in which dust is sandwiched between the surface of the magneto-optical disk and the sliding surface of the magnetic field applying head.

[Explanation of symbols]

3A Cleaning Disk that is the First Embodiment of the Present Invention 3B Cleaning Disk that is the Second Embodiment of the Present Invention 310 Cleaning Layer 310 4 Magneto-Optical Disk Drive that is an Embodiment of the Present Invention 410 Disk Drive Unit 411 Spindle Motor 420 Disk identification device 5 Host computer 60 Magnetic field applying head 62 Sliding surface of magnetic field applying head 60 Cleaning disk cartridge 701 chucking hub according to an embodiment of the present invention

Claims (6)

[Claims] 1. A disk for cleaning a magnetic field applying head, wherein a surface of a substrate having a predetermined thickness is covered with a uniform cleaning layer. 2. A magnetic field application characterized in that a magnetic recording layer is uniformly formed on the surface of a substrate having a predetermined thickness, and a cleaning layer is formed with a uniform abrasive on the surface of the magnetic recording layer. Disk for cleaning the head. 3. A cleaning disk, wherein an identification signal indicating that it is a cleaning disk is recorded outside the magnetic recording area of the cleaning disk according to claim 1 or 2. 4. A cleaning disk cartridge, wherein the cleaning disk according to claim 1 or 2 is rotatably mounted in the cartridge. 5. The cleaning disk cartridge according to claim 4, wherein at the time of cleaning the magnetic field applying head, the cleaning disk cartridge is present at least downstream from the position where the magnetic field applying head contacts the rotating cleaning disk. A cleaning disk cartridge characterized in that the inner wall of the cartridge is constituted by an adhesive inner wall. 6. A magnetic field applying head automatically contacts the cleaning layer of the rotating cleaning disk when the cleaning disk cartridge in which the cleaning disk is rotatably mounted is mounted in the magneto-optical disk device. Then, the magneto-optical disk device is provided with a cleaning means for automatically releasing the contact after a predetermined time has elapsed.