JPH06195940A - Disk cleaning structure of information recording and reproducing device - Google Patents

Abstract

PURPOSE:To simplify a cartridge, to reduce its cost and to reduce the size and thickness of the cartridge by transferring a cleaning means for disks to an information recording or reproducing device side. CONSTITUTION:A holder 2 moves to a descending position when the cartridge is completely inserted into a holder 2. A magnetic head 6 supported via a finger to the tongue part 3 of the holder 2 and a cleaning piece 14 are also moved to descend by this descending action. A head chip 8 of a head 6 comes into contact with the front surface of the disk 5 after the complete descending. Further, an adequate contact pressure is applied on the head 6 from above. On the other hand, the cleaning piece 14 is constituted of felt and is, therefore, crushed between the disk 5 and the tongue part 3 by descending of the tongue part 3. The contact pressure is obtd. by its own elasticity of the felt, by which the felt is brought into contact with the disk 5. Namely, the elasticity of the piece 14 itself is utilized as a means for generating the contact pressure to bring the piece 14 into contact with the disk 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention wipes dust, fingerprints and the like on the front or back surface of an information recording or reproducing apparatus using a disk such as a floppy disk drive, a hard disk drive or an optical disk drive as an information recording medium. Take disk cleaning structure.

[0002]

2. Description of the Related Art An example of a cleaning structure for a disk used in these information recording / reproducing apparatuses is generally a structure installed in a cartridge as a cleaning structure for a disk used in a floppy disk drive. -195585, or Shokai 62-85
975.

[0003]

However, in these known structures, a liner and a lifter, which are cleaning means for wiping off dust and the like on the disk, are provided inside the cartridge, so that the structure of the cartridge becomes complicated. However, there are drawbacks that the cost is high because the number of parts is large, and that the cartridge is thick and large when the means is arranged inside the cartridge.

Further, since a plurality of cartridges are provided in the information recording / reproducing apparatus (the drive) using the cartridge, the high cost of the cartridge means that the user cannot maintain the information recording / reproducing apparatus. Even from the burden, it was a big disadvantage.

[0005]

The structure of the present invention for solving the above-mentioned problems is as follows: 1. An information recording or reproducing disk, a head acting on the disk, a cleaning means capable of contacting the disk surface, and the cleaning means. The contact pressure generating means for pressing the disk.

2, an information recording or reproducing disk, a head acting on the disk, a cleaning means capable of contacting both the front and back surfaces of the disk, and the cleaning means are provided with independent spring means, respectively, and the spring means is used for the above. The disk can be pressed.

3. An information recording or reproducing disk, a head acting on the disk, a cleaning means capable of contacting both front and back surfaces of the disk, and a spring means connecting the cleaning means.

4. An information recording or reproducing disk, a head acting on the disk, a cleaning means capable of contacting both front and back surfaces of the disk, and the cleaning means are arranged facing each other or substantially in the vicinity of the disk. .

5, an information recording or reproducing disk, a head acting on the disk, a cleaning means capable of contacting both front and back surfaces of the disk, the cleaning means sandwiches the disk, and is opposed or substantially in the vicinity of a fulcrum. The structure is such that they are arranged in such a manner that they move in opposite directions during contact and non-contact operations with respect to the disk.

6, an information recording or reproducing disk, a head acting on the disk, a cleaning means capable of contacting both the front and back surfaces of the disk, the cleaning means sandwiches the disk, or the fulcrum is opposed to each other, or they are opposed to each other or substantially in the vicinity thereof. In addition, a cam means is provided between the cleaning means, and the cleaning means is brought into contact or non-contact with the disk by operating the cam means.

7. A disk for recording or reproducing information, a head acting on the disk, and a cleaning means capable of contacting the disk near the head.

8. An information recording or reproducing disk, a head acting on the disk, and a cleaning means capable of contacting the disk are provided, and the cleaning means is movable in the radial direction of the disk.

9. An information recording or reproducing disk, a head acting on the disk, and a cleaning means capable of contacting the disk are provided on the head.

It is characterized by

[0015]

【Example】

(Embodiment 1) Embodiment 1 of the present invention will be described in detail with reference to FIGS.

Reference numeral 1 is a contour line of the information recording or reproducing apparatus. A holder 2 has a space for storing a cartridge 4 in which a disk 5 which is an information recording medium is stored, and an opening / closing means 4 provided on a side surface of the cartridge 4.
The cam portion 22 with which 1 and 41 are engaged, the cleaning piece 14 described later, and the fingers of the magnetic head 6 (shown in FIG. 1)
Of the tongue 3 which are engaged with each other.

Reference numeral 7 is a leaf spring integrally formed at the rear portion of the magnetic head 6 and the magnetic head 6 is a well-known carriage 9.
When the cartridge 4 is attached to or detached from the information recording / reproducing apparatus, the magnetic head 6 is fixed to the leaf spring 7
Has a function to prevent the magnetic head 6 and the head chip 8 fixed to the back surface of the magnetic head 6 from interfering with the cartridge 4 and the disk 5 in the cartridge 4 by bending up and down with respect to the fulcrum.

A known optical head 10 is located on the back side of the disk 5 and has a function of irradiating the disk with a laser beam to reproduce the information recorded on the disk 5 or to record the information on the disk. Have. Reference numeral 11 is a clamper made of a magnetic material loosely mounted on the tongue portion 3 of the holder 2. 1
Reference numeral 2 denotes a spindle motor fixed to the information recording / reproducing apparatus, which horizontally holds a turntable 13 for holding the disk 5. Reference numeral 14 is a cleaning piece which has a cushioning property and is fixed to the tongue of the holder 2 by adhesion or the like, and is preferably a cleaning piece and is made of a non-woven fabric, felt or the like.

Reference numeral 15 denotes an upper cover which constitutes the cartridge 4, which is rotatable about a hinge 17 installed at a corner of the lower cover 16 as shown in FIG.
An opening / closing means 41 is provided on the side surface of the device 5.

The operation will be described.

The information recording or reproducing apparatus according to the present invention is provided with the holder 2 for storing the cartridge 4 as described above, and the holder 2 is located between the raised position shown in FIG. 4 and the lowered position shown in FIG. It is well known that the can be moved.

At the raised position, the cartridge 4 can be attached to and detached from the information recording / reproducing apparatus, and at the lowered position, the disk 5 as the information recording medium is clamped on the turntable 13 of the spindle motor 12. is there.

The cartridge 4 in the closed state shown by the solid line in FIG. 6 is inserted into the holder 2 from the lower side of FIG. When inserted almost to the middle, the opening / closing means 41, 41 on the side surface of the upper cover 15 of the cartridge 4 engages with the cam portion 22 of the holder 2 so that the cam portion 22 of the holder 2 shown in FIG. On the slope, the upper cover 15 is opened upward with the hinge 17 as a fulcrum. The magnetic head 6, the head chip 8, the tongue portion 3 of the holder 2 and the cleaning piece 14 fixed to the tongue portion 3 are provided inside the cartridge 4 and above the disk 5 through the opening which is opened at the tip in the insertion direction. Inserted in. The fully inserted state is shown in FIGS. 1, 2 and 3.

In the detached state where the holder 2 is in the raised position, the disk 5 is supported by the lower inner wall of the cartridge 4 in the cartridge 4 inserted as shown in FIG. The tongue 3 of the holder 2
Cleaning piece 14 fixed to the holder and the holder 2
The magnetic head 6 tilted upward by the tongue 3 and the head chip 8 (shown in FIGS. 2, 3 and 4) fixed to the magnetic head 6 do not interfere with the disk 5 and the cartridge. 4 is smoothly inserted into the holder 2.

When the cartridge 4 is completely inserted into the holder 2, the well-known cartridge position detecting mechanism detects the complete insertion, and the well-known mechanism causes the holder 2 to move as shown in FIGS. Transition to the lowered position shown. During the lowering operation, the disk 5 inside the cartridge 4 is fixed to the tip of the spindle motor 12 inside the information recording / reproducing apparatus by a turntable 13
Is held coaxially with the disk 5, but when the cartridge 4 is further lowered, the positional relationship shown in FIG.
Then, the inner wall of the cartridge 4 is detached, and the disk 5 is rotatable without contacting the cartridge 4. At this time, since the clamper 11 loosely mounted on the tongue portion 3 of the holder 2 magnetically attracts the turntable 13, the disk 5 is attached to the turntable 13.
It is firmly held in.

By the lowering operation of the holder 2, the magnetic head 6, which was supported by the tongue portion 3 of the holder 2 via the fingers, and the cleaning piece 14 also descend, so that the holder 2 is completely moved. In the lowered state, as shown in FIGS. 3 and 5, the head chip 8 provided on the magnetic head 6 contacts the upper surface of the disk 5, and further,
Although not shown, an appropriate contact pressure is applied by a well-known head spring acting from above the magnetic head 6.

On the other hand, since the cleaning piece 14 is made of thick felt having a cushioning property in the first embodiment, the disk 5 is moved by the lowering operation of the tongue portion 3.
It is appropriately crushed between the tongue portion 3 and the tongue portion 3 and comes into contact with the upper surface of the disk 5 in a state where an appropriate contact force is applied by the elasticity of the felt itself. That is, in this embodiment, the elasticity of the cleaning piece 14 itself is used as the contact force generating means for bringing the cleaning piece 14 into contact with the disk 5.

These states are shown in FIG.

In this state, the spindle motor 12 is driven, and the disk 5 together with the turntable 13 are driven.
Is rotated in the direction of arrow 50 in FIG. When the rotation speed is stable, the optical head 10 acts from the back surface side of the disk 5 to reproduce the information recorded on the disk 5. Further, if necessary, the head chip 8 is caused to act together with the magnetic head 6 and the magnetic recording layer provided on the upper surface (front surface side) of the disk 5 is magnetized by a magnetic action used in a known floppy disk drive. It can also be recorded or played.

The carriage 9 can seek the magnetic head 6 and the head chip 8 in the radial direction of the disk 5 in cooperation with a well-known step motor, and records data on a necessary track of the disk 5. It is renewable.

The disk 5 is housed in a cartridge 4. The cartridge 4 is provided with an opening 40 (shown in FIG. 1) for accessing the optical head 10 on the back side thereof. During storage, dust may enter through the opening 40 or a divided portion of the upper cover 15 and the lower cover 16, or a user's finger may enter and fingerprints may adhere.

The stains on the front and back surfaces of the disk 5 due to these disturb the normal operation of the magnetic head 6, head chip 8 and optical head 10, and when the stains are severe, the recording and reproduction of the information is impossible. Sometimes it becomes.

However, in the first embodiment of the present invention, as described above, since the cleaning piece 14 is arranged inside the information recording / reproducing apparatus as described above, the rotation of the disk 5 and the contact due to the contact force cause the influence of dust. It is possible to wipe away dust, fingerprints, and other dirt adhering to the magnetic recording layer, which is susceptible to susceptibility, to eliminate the effect thereof, and, in comparison with the conventional cartridge having the cleaning piece, the cartridge The structure can be simplified to be thin and small, and the device maintenance cost for the user can be reduced as described above.

The wiping action is as shown in FIG. 1, when the disk 5 is rotated clockwise as shown by an arrow 50.
The cleaning piece 14 is preferably installed in the vicinity of the magnetic head 6 and the head chip 8 and on the front side in the rotation direction with respect to them. This is because dust or the like on the disk 5 is wiped off before reaching the head chip 8, and the dust does not wind around the head chip 8 so that the head operation can be stably maintained. If the cartridge 5 is placed in the vicinity of the means, the upper cover 1 of the cartridge 5 can be attached or removed when the cartridge 5 is attached or detached.
This is convenient because the magnetic head 6 and the head chip 8 can be released when the opening / closing operation is performed, and the cleaning pieces and the like can be inserted and discharged through the opening together.

In the above description, an information recording or reproducing medium in which different kinds of recording layers corresponding to magnetic or optical heads acting from the front and back are arranged on the disk 5 has been described as an example, but the present invention is not limited to this. , A compact disk (CD) which is a read-only information recording medium for reproducing information by operating a known optical head from the back surface, or the cleaning from the back surface side (the optical head side) of the disk for a CD-ROM medium. It can be configured such that the piece 14 is acted to wipe off the dirt on the disk surface. In this case, the optical head 10 is cleaned by wiping off dust, fingerprints, etc. attached to the back surface of the disk.
It becomes possible to accurately irradiate the laser light from the back side of the disk 5 onto the recording layer of the disk, and the reflected light from the recording layer can be accurately received by the optical head 10 and the signal can be processed accurately.

Further, the cleaning piece and the contact force generating means are arranged in an information recording or reproducing apparatus for a recordable or reproducible disk called a known mini disk (MD) to wipe off dust and dirt on the surface of the disk. With such a structure, it is possible to greatly improve performance such as crash prevention and durability of the magnetic head and the disk for generating a reversal magnetic field for recording or erasing that acts on the minidisk. I can contribute.

As described above, the structure of the present invention can be applied to any kind of information recording or reproducing apparatus using a disk-shaped medium and has a great effect of improving its reliability.

In the first embodiment, the cleaning piece 1 is used.
4 is arranged in the holder 2, but if it is arranged in the magnetic head 6 so that the seek operation can be performed in the radial direction of the disk together with the magnetic head 6, the size of the cleaning piece 14 can be reduced. It is possible to reduce the contact area with the spindle motor, reduce the load on the spindle motor, and further, by performing the seek operation, the cleaning piece 14 rubs the disk in the radial direction as well. The wiping effect is improved.

(Embodiment 2) Another embodiment of the present invention will be described with reference to FIG.

What is different from FIG. 1 is the shape of the tongue 3 of the holder 2, and in particular, one element of the cleaning means for pressing the cleaning piece 14 against the disk 5 on the tongue 3. That is, a certain leaf spring 33 is integrally configured.

By disposing the cleaning piece 14 on the spring means such as the leaf spring 33 as described above, the surface wobbling of the disk 5 is slightly larger than that when the felt described in Embodiment 1 is used. Also, an appropriate contact pressure can be applied without increasing the rotational load on the spindle motor 12, and a more stable information recording / reproducing apparatus can be provided.

Further, since the tongue portion 3 of the holder 2 is formed integrally with the main body portion of the holder 2, an independent component is not required as a spring means and the cost increase can be suppressed, but the plate thickness If the contact pressure becomes too strong in the point of, the plate thickness is made thin only in the spring part, or a thinner plate material or wire is used as another member, and the means is installed in a part of the information recording / reproducing apparatus. , Applicable.

With this structure, the same effect as that of the first embodiment of the present invention can be obtained, and a thin non-woven fabric can be used as the cleaning piece 14 in addition to the felt having cushioning properties. (Third Embodiment) A third embodiment will be described with reference to FIGS.

In FIG. 8, the cleaning pieces 140, 140 serving as cleaning means are the disk 10 serving as an information recording medium.
5, the cleaning pieces 140 and 140 are fixed to springs 110 and 120 which are contact force generating means and cleaning means which are independent of each other. The springs 110 and 120 are fixed to fixing means 200 and 200 such as the holder, magnetic head or chassis of the information recording or reproducing apparatus.

A pin 150 is provided between the springs 110 and 120.
8 is provided with a cam 130 that can be swung around, and when the information recording or reproducing disk 105 is attached to or detached from the information recording or reproducing device together with the cartridge, the cam 130 is at the position of the imaginary line in FIG. is there. At this time, the cams 130 cause the springs 110, 120 to
Rotate at fulcrums consisting of respective spring parts and open in opposite directions to the positions indicated by imaginary lines.
The cleaning pieces 140, 140 provided on 120 are also separated from the disk 105.

At this time, since the disk 105 moves downward from the spindle motor or is released from the upper clamp, the spring 110 has a larger movement amount than the spring 120. .
Therefore, when the disk 105 is attached to or detached from the information recording or reproducing apparatus, the disk 105 or the cartridge accommodating the disk 105 is attached to the spring 11
0, 120 or the cleaning pieces 140, 140 do not interfere.

However, it is not easy in terms of space to provide an independent spring in a small-sized information recording / reproducing apparatus and to appropriately apply the contact pressure by the spring. This is because in such a small information recording or reproducing apparatus, the spindle motor that drives the disk 105 is also small.
Further, the power of the spindle motor is also small in relation to the power consumption. In such an environment, a brake torque due to the contact of the magnetic head is applied to the disk 105, and if a contact torque of the cleaning pieces 140, 140 to the disk 105 is also applied, a large load may occur. Therefore, it is preferable that the springs 110 and 120 acting on the cleaning pieces 140 and 140 are pressed by a small force of about 10 g to 3 g, but the shapes of the springs 110 and 120 vary due to a processing error, and It is preferable that the disk 105 be within this range even if the disk is wobbling.

Even if there are these variations, the spring constants of the springs 110 and 120 may be lowered in order to be within the spring force. To achieve this in a small space, as shown in FIG. It is preferable that the springs 110 and 120 are integrally formed and that the total length of the springs is set to be long. With such a configuration, the contact force acting on both of the cleaning pieces 140, 140 can be set to be substantially the same, and as described above, the spring constant can be reduced to reduce the variation in the contact force. .

Even with this arrangement, the spring portion as the cleaning means and the cleaning pieces 140, 140 can be moved to the state shown by the imaginary line in FIG. 9 by the rotation of the cam 130 with the spring portion of 110, 120 as the fulcrum. ,
The attachment / detachment of the cartridge is smoothly performed.

Further, by disposing the cleaning pieces 140, 140 so as to face each other with the disk 105 interposed therebetween as shown in FIGS. 8, 9 and 10, the contact force generated by the cleaning pieces 140, 140 is increased. Since it is possible to cancel the moment applied to the spindle of the spindle motor due to the above, there is no need to increase the lateral pressure exerted on the bearing (not shown in the figure of the spindle motor) of the spindle motor, so that the power consumption is small and the size is small. It is possible to provide the information recording or reproducing device of.

(Embodiment 4) This will be described with reference to FIG.

Only the differences from the first to third embodiments will be described in detail.

Information recording or reproduction information recording disk 1
The cleaning pieces 140 and 140 are arranged on the front and back sides of the cleaning piece 140 and the cleaning piece 140 and the cleaning piece 140, respectively.
Each of 0s is fixed to the spring piece 110 and the other piece 120 which are contact force generating means bent at the substantially central portion.
Further, one end of the spring is bent into an L shape, and a hole is provided in this surface to engage with the pin 200.

In such a structure, the springs 110, 1
Since the member including the cleaning piece 140 and the cleaning piece 140 is swingable around the pin 200, the member can be easily rotated with the disk 105 by rotating the member in the arrow direction when the cartridge is attached or detached. It can be engaged and disengaged. Even in this case, since the springs 110 and 120 can adopt a long integrated structure disposed between the cleaning pieces, it is possible to reduce the variation between the cleaning pieces with a weak force in the contact state as described above. In addition, by installing a cam means similar to that of the third embodiment for swinging the member around the pin 200, it is possible to cope with the mounting and demounting operation of the cartridge.

In the case of the fourth embodiment, the cleaning piece 14 is used.
The positions 0 and 140 are not completely opposite to each other.
Although they are at positions separated by the amount indicated by No. 1, they are placed so close to each other that they are located in the disk 10
Even if 5 is pressed by the contact force, the moment acting on the disk 105 is not large. Therefore, it is possible to provide an information recording or reproducing apparatus as efficient as that described in the third embodiment.

Further, as described above, by disposing the magnetic head 6, the cleaning piece, and the spring means which is the contact force generating means of the cleaning piece in the vicinity, when the cartridge is attached or detached, the cartridge head is opened. These members can be inserted and discharged very easily, and even if the opening is small, they do not interfere with each other, which is convenient.

[0057]

As described above, according to the present invention, the cleaning means for the disk such as the liner and lifter in the cartridge, which is conventionally provided inside the cartridge, is moved to the information recording or reproducing device side. As described above, the cost can be reduced by simplifying the cartridge, and the size and thickness of the cartridge can be reduced.

On the other hand, if the cleaning means is installed on the side of the information recording or reproducing apparatus, the cost of the apparatus will be slightly higher, but the cleaning means will be installed in the cartridge each time a plurality of cartridges used in the apparatus are purchased. The method of the present invention is effective in terms of the maintenance cost of the information recording or reproducing apparatus, considering that it is attached and the price is high.

As described above, the cartridge is small,
If it can be made thin, the handleability of the cartridge and the information recording / reproducing apparatus using the cartridge will be increased, and the usability will be improved.

Further, in the conventional CD, CD-ROM, etc., since the disk is not contained in the cartridge, the user has to grasp the disk with his / her finger. There were a lot of things that happened. Even if the disk is attached to the device in this state to read information, the laser light may not normally reach the information recording surface due to the dirt, and the device may not operate.

According to the present invention, even when a cartridge having no cleaning means is used, or when a cartridge having a conventional cleaning means is used, only a disk not contained in the cartridge is used. Even if it is mounted on the information recording or reproducing device, it has an action of wiping off the dirt of these disks, so that any type of cartridge or disk should have a loading structure such as a holder for the corresponding cartridge or disk. This can be dealt with and the reliability can be improved.

Further, in the disk in which the magnetic recording layer and the optical recording layer are arranged above and below the disk as described above, when the cleaning pieces are arranged so as to face each other with the disk in between or in the vicinity thereof, Since the moment due to the contact force acting on the disk is not generated, the above effect can be produced without increasing the load on the spindle motor, and the power consumption of the device can be suppressed,
It also greatly contributes to miniaturization of the device.

Similarly, as described in the application example of the present invention, the cleaning piece and the cleaning piece are constituted by independent contact force generating means, and these are arranged in the opposite direction with the contact force generating means as a fulcrum when the disk is attached or detached. When configured to operate, the disk can be smoothly attached to and detached from the apparatus without the head, the cleaning piece and the disk, or the cartridge interfering with each other during the attachment and detachment.

Further, when the cleaning piece and the other cleaning piece are connected by the same spring means, the contact pressure can be set to a weak value within the space of a small information recording or reproducing device, and fluctuations in variation can be prevented. It is possible to provide a strong information recording or reproducing device.

Further, by interposing the cam between the plurality of spring means, it is possible to operate them in the opposite directions by a required amount with a simple structure, and it is cheap, reliable, and easy to use information recording or It can be a playback device.

The above-described plurality of embodiments of the present invention can be carried out alone or in combination, and the effects of the present invention can be produced. Further, the information recording medium, the recording or reproducing device for the information recording medium is a medium having only a reproducing function, the recordable medium, and any combination of the recording or reproducing devices corresponding thereto, and further, the medium. It does not deviate from the gist of the present invention even if the cleaning means is arranged on only one side or both sides.

[Brief description of drawings]

FIG. 1 is an assembly plan view of an information recording / reproducing apparatus of the present invention.

FIG. 2 is a left side view of FIG.

FIG. 3 is a left-side cross-sectional view when the central portion of the disk in FIG. 1 is cut vertically.

FIG. 4 is a cross-sectional view seen from the front side when the central portion of the disk of FIG. 1 is horizontally cut, showing a state in which the holder is at a raised position where the cartridge can be attached to and detached from the information recording / reproducing apparatus.

FIG. 5: The cartridge descends from the state of FIG. 4,
Sectional drawing seen from the front side which shows the state in which the disk was clamped by the spindle motor.

FIG. 6 is a side view of the cartridge.

FIG. 7 is an assembly plan view showing an application example of the information recording / reproducing apparatus of the present invention.

FIG. 8 is a side view of a main portion showing a third embodiment of the present invention.

FIG. 9 is a side view of a main portion showing another structure of the third embodiment of the present invention.

10 is a plan view of a main part of FIGS. 8 and 9. FIG.

FIG. 11 is a plan view of a main portion showing a fourth embodiment of the present invention.

[Explanation of symbols]

 1: Outline shape line of the information recording / reproducing apparatus of the present invention. 2: Holder 3: Tongue of holder 4: Cartridge 5: Disk 6: Magnetic head 7: Leaf spring 8: Head chip 9: Carriage 10: Optical head 11: Clamper 12: Spindle motor 13: Turntable 14: Cleaning piece 15 : Upper cover 16: Lower cover 17: Hinges

Claims (9)

[Claims] 1. An information recording or reproducing disk, a head acting on the disk, a cleaning means capable of contacting the disk surface, and a contact force generating means for pressing the cleaning means against the disk. A disk cleaning structure for an information recording / reproducing apparatus. 2. An information recording / reproducing disc, a head acting on the disc, a cleaning means capable of contacting both front and back surfaces of the disc, and the cleaning means are provided with independent spring means, respectively, and the spring means is used for the above. A disk cleaning structure for an information recording / reproducing apparatus, characterized in that the disk can be pressed. 3. An information recording / reproducing disc, a head acting on the disc, a cleaning unit capable of contacting both front and back surfaces of the disc, and a spring unit connecting the cleaning units. Disk cleaning structure for recording / playback devices. 4. An information recording or reproducing disk, a head acting on the disk, a cleaning means capable of contacting both front and back surfaces of the disk, and the cleaning means are arranged facing each other or substantially in the vicinity of the disk. A disk cleaning structure of an information recording / reproducing apparatus characterized by: 5. A disk for recording or reproducing information, a head acting on the disk, a cleaning means capable of contacting both front and back surfaces of the disk, the cleaning means sandwiching the disk and facing or substantially near the fulcrum. A disk cleaning structure for an information recording / reproducing apparatus, wherein the disk cleaning structure is arranged and moves in opposite directions during contact and non-contact operations with respect to the disk. 6. An information recording or reproducing disk, a head acting on the disk, a cleaning means capable of contacting both front and back surfaces of the disk, the cleaning means sandwiching the disk, or facing or substantially near the fulcrum. Information recording characterized in that a cam means is provided between the cleaning means and the cleaning means is brought into contact with or not in contact with the disk by operating the cam means. Disk cleaning structure of the playback device. 7. A disk cleaning structure for an information recording / reproducing apparatus, comprising: an information recording / reproducing disk, a head acting on the disk, and a cleaning means arranged in the vicinity of the head so as to be in contact with the disk. 8. An information recording or reproducing disk, a head acting on the disk, and a cleaning means capable of contacting with the disk are provided, and the cleaning means is movable in a radial direction of the disk. Disk cleaning structure of information recording / reproducing device. 9. A disk cleaning structure for an information recording / reproducing apparatus, comprising: an information recording / reproducing disk; a head acting on the disk; and a cleaning means for contacting the disk with the head.