JP2002260367A - Recording and reproducing device and disk cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recording and reproducing device which can suppress the fluttering of an optical disk and can stably realize good recording and reproduction by suppressing pressure fluctuation when an object lens or an optical pickup equipped with the object lens is moved and to provide a disk cartridge. SOLUTION: A transparent stabilizer 5 interlocked with an optical pickup 4 are arranged between a disk 1 and an optical pickup 4. A slider 7 is arranged so as to face the transparent stabilizer 5 across the disk 1. The slider 7 is oscillatably supported and has a flat surface facing the disk 1. During the rotation of the disk 1, the slider 7 is moved forward and backward so as to balance the air pressure between the transparent stabilizer 5 and the disk 1 with the air pressure between the slider 7 and the disk 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus capable of recording / reproducing high-density information and recording / reproducing information signals on / from an optical disk having flexibility. It relates to a disk cartridge.

[0002]

2. Description of the Related Art Hitherto, optical disks, such as optical disks and magneto-optical disks, for recording and reproducing information using a laser have been known. In recent years, in order to record more information, the recording density of optical discs has been increased, and accordingly, recording pits have been reduced in size.

In an optical pickup for reproducing an optical disk having a high recording density as described above, in order to read information recorded in a minute area, it is necessary to narrow a light spot focused on the optical disk to the minute area. is there. By reducing the spot size in this way, more information can be recorded.

[0004] The spot size is proportional to the wavelength λ of the light source used, and is inversely proportional to the numerical aperture NA of the objective lens. Therefore, in order to reduce the light spot size, the wavelength λ of the light source to be used is reduced, or
It is necessary to increase the numerical aperture NA of the objective lens.

On the other hand, if the wavelength λ of the light source used is reduced or the numerical aperture NA of the objective lens is increased, a large coma aberration occurs in the light beam when the optical disk is tilted. This makes it impossible to accurately focus the light beam on the optical disk.

Therefore, conventionally, the optical disk has been made thinner in order to shorten the optical path inside the optical disk and increase the allowable amount with respect to the inclination of the optical disk substrate.

For example, a CD-ROM (Compact Disc Rea)
d-Only Memory) has a numerical aperture NA = 0.45 and a wavelength λ =
780 nm, and the thickness of the optical disk substrate is 1.2 mm. On the other hand, DVD-ROM (Digital Versatile Disc R)
ead-Only Memory) has a numerical aperture NA = 0.6, a wavelength λ =
655 nm, and the thickness of the optical disk substrate is 0.6 mm. As described above, the DVD-ROM has a smaller recording wavelength by increasing the wavelength λ of the light source used, increasing the numerical aperture NA of the objective lens, and reducing the thickness of the optical disk substrate, as compared with the CD-ROM. And the allowable amount for the inclination of the optical disk substrate can be increased.

However, if the thickness of the optical disk substrate is further reduced in order to further increase the allowable amount with respect to the inclination of the optical disk substrate, the rigidity of the optical disk substrate is reduced, whereby the surface of the optical disk substrate itself is reduced. The tilt of the optical disk substrate due to the shake is increased, which has the opposite effect. Therefore, there is a limit to shortening the wavelength λ of the light source and increasing the numerical aperture NA of the objective lens.

Japanese Patent Laid-Open Publication No. Hei 10-308059 discloses that an optical disk having a smaller thickness and a numerical aperture N can be obtained by stabilizing the state of the optical disk during rotational driving.
A recording / reproducing apparatus that can use an objective lens having a large A and light having a short wavelength λ is described. FIG. 11 shows the configuration of the recording / reproducing apparatus in the above publication.

As shown in FIG. 1, a recording / reproducing apparatus for recording / reproducing information on / from an optical disk 101 includes a spindle 105 for rotating the optical disk 101, and an optical pickup for condensing and irradiating a light beam onto the optical disk 101. 1
03 and a stabilizing plate 102 for stabilizing the rotation state of the optical disk 101. The optical disk 101 is very thin and has flexibility. The optical disk 101 has a center hub 104 having magnetism. The optical disk 101 is fixed to the spindle 105 by magnetic coupling at the center hub 104. The optical pickup 103 has a condensing unit such as an objective lens group. The stabilizing plate 102 and the optical pickup 103 are arranged to face each other with the optical disk 101 interposed therebetween.

Recording of information on the optical disk 101
At the time of reproduction, the optical disk 101 is rotated close to the stabilizing plate 102. At this time, the space between the optical disk 101 and the stabilizing plate 102 is in a reduced pressure state. For this reason, the flexible optical disk 101 is used for the stabilizing plate 1.
02, and rotates while keeping the distance between the optical disk 101 and the stabilizing plate 102 constant. Therefore,
Surface runout during rotation of the optical disk 101 is suppressed. Thus, the optical pickup 10 has a wavelength of light of 650 nm or less and a numerical aperture NA of the objective lens group of 0.7 or more.
Recording / reproducing with a recording / reproducing apparatus using the third embodiment can be realized.

Further, as shown in FIG. 12, the above publication discloses a recording / reproducing apparatus using a disk cartridge 106 integrally formed with a stabilizing plate 102.
In this case, the optical pickup 103 is inserted through an opening (not shown) of the disk cartridge 106. In such a recording / reproducing apparatus, the disk cartridge 10
By providing the stabilizing plate 102 in the optical disk 6, it is possible to suppress the surface runout of the optical disk 101 during rotation as in the recording / reproducing apparatus shown in FIG.
01. Recording and reproduction using an objective lens having a large numerical aperture NA and light having a short wavelength λ can be realized.

[0013]

However, the above configuration has the following problems.

Generally, when recording / reproducing an optical disc,
In order to always keep the information recording surface of the optical disk within the depth of focus of the condensing means such as an objective lens, the distance between the optical disk and the condensing means is kept constant, and the laser beam is kept in focus. Control is performed.

As described above, when recording / reproducing information on / from the optical disk 101, focus control is performed, and the optical pickup 103 comes close to the optical disk 101. At this time, according to the configuration described in the above publication, in the recording / reproducing apparatus shown in FIG. 11 and the recording / reproducing apparatus using the disk cartridge 106 shown in FIG. And the like, which has light collecting means, but this surface is a surface having relatively large irregularities. For this reason, every time the focusing unit moves to perform the focus control, a pressure fluctuation occurs around the focusing unit, that is, around the optical pickup 103, and the air pressure between the optical pickup 103 and the optical disk 101 tends to fluctuate. . Therefore, the movement of the light condensing means causes the surface of the optical disk 101 to oscillate, and the focus control cannot be stably performed.

As described above, conventionally, when the light-collecting means in the optical pickup moves, for example, for focus control, a pressure fluctuation occurs around the optical disk, thereby causing the optical disk to oscillate. Therefore, stable focus control cannot be performed, and it has been difficult to perform good recording and reproduction.

Further, even if the disk has flexibility,
Even if it is not provided, the higher the number of rotations of the disk and the higher the speed of rotation, the more likely it is for the disk to oscillate, making it more difficult to perform stable recording and reproduction.

The present invention has been made in view of the above circumstances, and an object thereof is to suppress surface runout, perform stable and good recording and reproduction even during high-speed rotation, and move the objective lens. An object of the present invention is to provide a recording / reproducing apparatus and a disc cartridge which can suppress surface fluctuations of an optical disc by suppressing pressure fluctuations at the time and the like, and stably realize good recording / reproducing.

[0019]

In order to solve the above-mentioned problems, a recording / reproducing apparatus of the present invention irradiates a rotating disk with a laser beam to record / reproduce information. The apparatus is characterized in that a stabilizing slider having an opposing flat surface is provided, which is arranged to face the disk and is swingably supported.

According to the above configuration, when the disk rotates, air flows between the disk and the stabilizing slider due to the rotation of the disk, and the stabilizing slider has an opposing flat surface. An air bearing is formed between the slider and the disk. Moreover, since the stabilizing slider is swingably supported, it can always move to a position at a fixed distance from the disk when the disk rotates.

Therefore, the disk rotates while the distance between the stabilizing slider and the disk is kept constant. As a result, even if the disk rotates at a high speed, the runout of the disk can be suppressed, so that recording / reproduction can be performed stably.

Further, a stabilizing plate may be provided so as to face the stabilizing slider via the disk.

In this case, an air bearing is also generated between the stabilizing plate and the disk when the disk is rotated, like an air bearing is generated between the stabilizing slider and the disk. At this time, the pressure between the stabilizing slider and the disk is balanced with the pressure between the stabilizing plate and the disk, and the disk rotates while maintaining a constant distance from the stabilizing slider and the stabilizing plate. . As a result, it is possible to suppress the runout of the disk during the rotation of the disk, and to further stabilize the rotation of the disk.

The stabilizing plate is swingably supported.
It may be constituted by a slider having an opposing surface.

In this case, like the stabilizing slider, the stabilizing plate is a slider that is swingably supported. Therefore, when the disk rotates, the stabilizing plate always moves to a position at a fixed distance from the disk. Can be. Therefore, the disk rotates while the distance between the stabilizing plate and the disk is kept constant. As a result, even if the disk rotates at a high speed, the runout of the disk can be suppressed, so that recording / reproduction can be performed stably.

Therefore, by using the slider as the stabilizing plate in addition to the stabilizing slider, it is easy to keep the distance between the disk, the stabilizing slider and the stabilizing plate constant during the rotation of the disk. That is, it is possible to easily provide a recording / reproducing apparatus capable of suppressing the surface runout of the disk during rotation of the disk and performing stable recording / reproduction.

[0027] The slider may be a focusing slider provided with a focusing means for focusing the laser beam irradiated on the disk.

In this case, by providing the slider with the focusing means, the slider can suppress the surface deflection of the disk due to the pressure fluctuation accompanying the movement of the focusing means. That is, since the slider also moves in the same direction with the movement of the light condensing means, it is possible for the slider to absorb the pressure fluctuation caused by the light condensing means, and it is possible to suppress the surface runout when the disk rotates.

Thus, recording and reproduction can be performed stably when the disk is rotating.

A first lens and a second lens as light condensing means are arranged at a predetermined interval on the condensing slider, and a piezoelectric element layer for controlling the distance between the first lens and the second lens is provided. May be provided.

In this case, a numerical aperture is increased by condensing and irradiating light for recording and reproduction using a second lens group including a first lens and a second lens as a light condensing means.
A smaller light beam spot diameter can be realized, and an improvement in recording density can be realized. Then, by controlling the distance between the first lens and the second lens by the piezoelectric element layer, it is possible to correct the defocus caused by the distribution of the thickness of the substrate and the thickness of the coat layer.

The stabilizing slider may be provided with a magnetic field generating element for generating a magnetic field.

In this case, the present invention can be applied to a magneto-optical disk using a recording medium requiring a magnetic field for recording.

An air-core coil as a magnetic field generating element for generating a magnetic field may be provided on the stabilizing plate.

Further, a soft magnetic material may be provided on the stabilizing slider in a state where an air-core coil for generating a magnetic field is provided on the stabilizing plate.

In this case, the strength of the recording magnetic field applied to the magneto-optical disk can be increased by the respective magnetic fields of the air-core coil provided on the stabilizing plate and the soft magnetic material provided on the stabilizing slider. Thus, the quality of the reproduced signal can be improved.

Also, the disk cartridge of the present invention
In order to solve the above-described problems, a disk used in each of the recording / reproducing apparatuses is housed in a cartridge, and
A disk cartridge from which a disk is exposed during recording / reproduction, wherein an inner wall surface of the disk cartridge is a stabilizing plate capable of reducing a space between the disk and the disk when the disk rotates.

According to the above configuration, the stabilizing plates formed on both inner wall surfaces of the disk cartridge further suppress the surface runout during the rotational driving of the disk, thereby achieving more stable and good recording and reproduction. Can be realized.

At this time, the distance between the inner surface of both the disk and the disk cartridge case is 10 μm.
By setting the diameter to m or more and 200 μm or less, the rotation of the disk can be stabilized.

In order to solve the above-mentioned problems, a recording / reproducing apparatus according to the present invention comprises a light source, a condensing means for converging and irradiating a laser beam emitted from the light source onto a disk, and rotating the disk. A recording / reproducing apparatus provided with a rotating drive unit that performs a rotation operation. The first stabilizing plate is disposed between the disk and the light condensing unit and interlocks with the light condensing unit such as an objective lens. And a slider having an opposing plane, which is arranged to face the first stabilizing plate and is swingably supported.

According to the above configuration, when recording / reproducing a disk, that is, when the disk is driven to rotate, air flows between the disk and the slider due to the rotation of the disk. As a result, the air pressure between the slider and the disc increases. Therefore, a pressure is applied between the slider and the disk. Similarly, as the disk rotates, air flows between the disk and the first stabilizing plate,
The space between the disk and the first stabilizing plate is also in a pressurized state. The slider is swingably supported. Therefore, the slider can move to a position where the air pressure between the disk and the first stabilizing plate and the air pressure between the slider and the disk are balanced.

As described above, the space between the slider and the disk, and the space between the first stabilizing plate and the disk are both in a pressurized state, and when they are balanced, the disk is fixed to the slider and the first stabilizing plate. Rotate while maintaining the interval. This makes it possible to suppress surface runout of the disk during rotation of the disk, and to stabilize rotation of the disk.

Here, in the case where the first stabilizing plate is not provided and the disk and the light condensing means are directly opposed to each other without sandwiching anything therebetween, for example, the light condensing means is provided in the optical pickup. When driven, the surface of the optical pickup facing the disk is a surface having the above-mentioned light condensing means, and this surface is a surface having relatively large irregularities. For this reason, every time the light condensing means moves, a pressure fluctuation occurs around the light condensing means, and the air pressure between the light condensing means and the disk is likely to fluctuate. Therefore,
The movement of the light condensing means causes the disk to run out.

However, by disposing the first stabilizing plate interlocking with the light-collecting means between the disk and the light-collecting means, the surface of the light-collecting means facing the disk becomes a flat surface. The pressure of the air between the disk and the disk is made uniform. Therefore, for example, even if the light-collecting unit moves for performing the focus control, the fluctuation of the air pressure between the first stabilizing plate and the disk can be suppressed, and the disk runout can be suppressed.

Further, since the slider is swingably supported in the vertical direction with respect to the disk, for example, when performing focus control or the like, the optical pickup or the like having the light condensing means moves and the disk and the first disk are moved. Even if there is a fluctuation in the air pressure between the stabilizing plate and the air pressure between the disk and the first stabilizing plate, the air pressure between the disk and the slider balances accordingly, The air pressure between the disc and the slider can be varied.

As a result, the condensing means may move with respect to the disk, and even if the first stabilizing plate moves in conjunction with the condensing means, the air between the disc and the first stabilizing plate may move. The slider also moves relative to the disk so that the pressure balances the air pressure between the disk and the slider. Moreover, since the slider also has the opposing plane, mutual air pressure can be easily and stably balanced. Therefore, a change in the position of the disk in the vertical direction due to a pressure change around the disk, that is, a surface runout is suppressed, and, for example, focus control and tracking are stabilized and facilitated.

As a result, the rotation of the disk can be stabilized even if the light-collecting means or the optical pickup provided with the light-collecting means moves. -It is possible to provide a recording / reproducing device capable of realizing reproduction. Further, since a thin disk can be used, the optical path inside the disk can be shortened, and the allowable amount for the inclination of the disk can be increased. Accordingly, it is possible to increase the recording density of the disk.

In the recording / reproducing apparatus, it is preferable that the first stabilizing plate is fixed to the light condensing means via an elastic member having elasticity.

According to the above configuration, even when the slider vibrates due to external vibration and the disk is pushed by the pressure between the disks and vibrates with the vibration of the slider, the elastic member expands and contracts. Accordingly, the first stabilizing plate can follow the vibration of the disk such that the air pressure between the disk and the first stabilizing plate and the air pressure between the disk and the slider are balanced. Therefore, it is possible to prevent the disk from being damaged due to the collision between the disk and the first stabilizing plate due to the external vibration.

In the recording / reproducing apparatus, it is preferable that the condensing means is a group lens obtained by combining at least two lenses.

According to the above arrangement, the numerical aperture N of the light condensing means
A can be increased, thereby reducing the spot size of the laser beam irradiated on the disk. Therefore, the recording capacity of the disk can be increased, and the density of the disk can be increased. This makes it possible to provide a recording / reproducing apparatus suitable for high-density recording / reproducing.

In the recording / reproducing apparatus, it is preferable that the slider includes a magnetic field generating element for generating a magnetic field.

According to the above configuration, since the slider has the magnetic field generating element, information can be recorded / reproduced using a magneto-optical disk using a recording medium requiring a magnetic field for recording. An apparatus can be provided.

In the recording / reproducing apparatus, the first stabilizing plate is preferably transparent.

According to the above configuration, even if the first stabilizing plate is disposed between the disk and the light condensing means, the first stabilizing plate is transparent, so that the laser light emitted from the light source can be obtained. Can be passed through the first stabilizing plate without providing an opening or the like for passing a laser beam.

The recording / reproducing apparatus faces the disk,
In addition, it is preferable that a second stabilizing plate is further provided at a position where the space between the disk and the disk can be reduced in pressure during the rotation of the disk. The second stabilizing plate may be on either the front or back surface of the disk.

According to the above arrangement, the second stabilizing plate is arranged separately from the slider so as to be close to and opposed to the disk, so that when the disk is rotationally driven, the disk and the second stabilizing plate are rotated. Can be in a reduced pressure state. At this time, the disk is attracted to the second stabilizing plate, and rotates while keeping the distance between the disk and the second stabilizing plate constant. This makes it possible to suppress the runout of the disk during rotation of the disk, and to stabilize the rotation of the disk at a position away from the slider and the first stabilizing plate.

Therefore, for example, when the optical pickup provided with the light condensing means moves, the air pressure between the disk and the first stabilizing plate is balanced with the air pressure between the disk and the slider. Even when the first stabilizing plate and the slider move, since the rotation of the disk at a position distant from the first stabilizing plate and the slider is stable, the pressure fluctuation due to the movement of the first stabilizing plate and the slider. And the surface runout of the disk is further suppressed. As a result, it is possible to provide a recording / reproducing apparatus capable of stably achieving good recording / reproducing.

In the recording / reproducing apparatus, it is preferable that the second stabilizing plate is formed with an opening for allowing the slider or the first stabilizing plate to approach the disk during recording / reproducing.

According to the above configuration, the slider or the first stabilizing plate can be brought close to the disk during recording / reproducing, whereby the pressure between the disk and the slider and between the disk and the first stabilizing plate can be increased. Can be stabilized.

The disk cartridge of the present invention is a disk cartridge in which a disk used in the above-mentioned recording / reproducing apparatus is housed in the cartridge and the disk is exposed during recording / reproduction.
It is characterized in that the stabilizing plate is constituted by one inner wall surface of the cartridge.

According to the above configuration, since the second stabilizing plate is formed on one inner wall surface of the cartridge, when the disk is driven to rotate, the disk and the one inner wall surface of the cartridge are in contact with each other. The interval is in a reduced pressure state. At this time, the disk is attracted to one inner wall surface of the cartridge and rotates while maintaining a constant distance between the disk and one inner wall surface of the cartridge. This makes it possible to suppress the runout of the disk during rotation of the disk, and to stabilize the rotation of the disk at a position away from the slider and the first stabilizing plate.

Therefore, for example, when the optical pickup provided with the condensing means moves, the air pressure between the disk and the first stabilizing plate is balanced with the air pressure between the disk and the slider. Even when the first stabilizing plate and the slider move, since the rotation of the disk at a position distant from the first stabilizing plate and the slider is stable, the pressure fluctuation due to the movement of the first stabilizing plate and the slider. And the run-out is further suppressed. As a result, it is possible to provide a recording / reproducing apparatus capable of stably achieving good recording / reproducing.

Further, since the second stabilizing plate is constituted by one inner wall surface of the cartridge, the second stabilizing plate can stabilize the rotation of the disk without newly increasing the number of parts. A bi-stabilizing plate can be provided.

The disk cartridge of the present invention is a disk cartridge in which the disk is housed in the cartridge and the disk is exposed during recording and reproduction. The disk cartridge faces the disk and rotates when the disk rotates. A second stabilizing plate constituted by both inner wall surfaces of the cartridge is provided at a position where the pressure can be reduced.

According to the above configuration, since the second stabilizing plate is formed on both inner wall surfaces of the cartridge, when the disk is driven to rotate, the inner wall surface of both the disk and the cartridge is connected. The interval is in a reduced pressure state. At this time, the disk rotates stably while keeping the distance between both inner wall surfaces of the cartridge constant. As a result, it is possible to suppress the surface runout of the disk during rotation of the disk.

Further, since the second stabilizing plate is constituted by both inner wall surfaces of the cartridge, the rotation of the disk can be further stabilized without newly increasing the number of components as the second stabilizing plate. A second stabilizing plate can be provided.

More specifically, the distance between the inner wall surface of both the disk and the cartridge is preferably 10 μm or more and 200 μm or less.

According to the above arrangement, the distance between the inner wall surface of each of the disk and the cartridge is set to 10 μm or more, so that the disk and the cartridge can be separated from each other when an external influence such as vibration occurs. It is possible to prevent collision and damage to the disk.

When the distance between the disk and the inner wall surface of each of the cartridges is set to 200 μm or less, the disk is less affected by external influences such as vibration. That is, since the space in the cartridge is limited, pressure fluctuation in the cartridge is reduced. Therefore, even if vibration is generated outside, the reduced pressure state between the inner wall surface of the cartridge and the disk is hardly hindered. Thus, each time the disk is affected by external influences such as vibration, the rotation of the disk in the cartridge becomes unstable, and it is possible to suppress the disk from running out in the space in the cartridge. Therefore, the rotation of the disk can be stabilized.

The above-mentioned disk cartridge exposes the disk at the time of recording and reproduction on both inner wall surfaces of the cartridge, and is arranged between the light-collecting means used in the recording and reproducing apparatus and the disk. A first stabilizing plate cooperating with the first stabilizing plate, and a slider having an opposing flat surface, which is disposed so as to face the first stabilizing plate with the disc interposed therebetween and is swingably supported. Is preferably formed.

According to the above arrangement, the slider and the first stabilizing plate can be close to the disk by providing the openings on both inner wall surfaces of the cartridge. When the disk rotates, air flows between the disk, the slider and the first stabilizing plate, and the disk
A pressure is applied between the slider and the first stabilizing plate. Accordingly, by bringing the first stabilizing plate and the slider, which stabilize the rotation of the disk by balancing the pressurized state at this time, close to the disk, the load between the disk and the slider and between the disk and the first stabilizing plate are increased. The balance of the pressure state can be further stabilized.

The present invention can be applied irrespective of whether or not the disk is flexible. In particular, the present invention can be effectively applied to a disk having flexibility. That is, if the number of rotations is the same, a flexible disk is more likely to cause surface deflection than a non-flexible disk. Therefore, the present invention for suppressing the surface runout during rotation of the disk can be effectively applied to a flexible disk in which the surface runout is likely to occur.

[0074]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [Embodiment 1] An embodiment of the present invention will be described below with reference to FIGS. 1 to 5 and FIG. In this embodiment and the following embodiments, a case will be described in which the present invention is applied to a flexible disk.

FIG. 1 is a sectional view showing the structure of the main part of the recording / reproducing apparatus. As shown in the figure, the recording / reproducing apparatus according to the present embodiment includes a spindle (rotation driving means) 3, an optical pickup 4, a transparent stabilizing plate (first stabilizing plate) 5, a support portion 6, a slider 7, and It has a suspension 8 for recording and reproducing information on the disk 1.

A transparent stabilizer 5 is provided on the optical pickup 4.
Are fixed integrally. An optical pickup 4 having a transparent stabilizing plate 5 is provided on one surface of the disk 1 at a predetermined distance, and a position facing the transparent stabilizing plate 5 and the optical pickup 4 on the other surface of the disk 1. Is provided with a slider 7. The optical pickup 4 and the slider 7 are integrally fixed via a support portion 6 which is a support member for supporting the slider 7 and a suspension 8.

The disk 1 is made of a transparent resin, has a small thickness, and has flexibility. Also, disk 1
It has a center hub 2 having magnetism, and is chucked to the spindle 3 by magnetic coupling. Spindle 3
Is rotationally driven by a motor (not shown),
The disk 1 is driven to rotate. At the time of recording / reproducing information, the disc 1 is rotating.

The disk 1 is not particularly limited as long as it is a flexible optical disk, and a ROM (Read-On) having a pit row composed of concave portions formed on the substrate surface.
ly Memory) disk, a write-once optical disk using an organic dye material as a recording medium, or a rewritable optical disk using a phase change material as a recording medium.

Here, it is assumed that a write-once optical disk or a rewritable optical disk is used as the disk 1.
At this time, as shown in FIG. 2, the disk 1 protects the disk substrate 1a having an uneven guide groove on the surface, the recording medium 1b formed on the surface having the uneven guide groove, and the recording medium 1b. And a protective layer 1c.

The optical pickup 4 has an optical pickup housing 15 as shown in FIG. Inside the optical pickup housing 15, a light emission detection optical system (light source) 10, a biaxial actuator 14, a lens holder 13, and an objective lens (light collecting means) 12 are arranged.

The light emission detecting optical system 10 has a light emitting element as a light source, and emits a laser beam 11 in the direction of the disk 1. The biaxial actuator 14 is used for the optical pickup housing 1
5 and supports the lens holder 13. The lens holder 13 holds the objective lens 12 between the light emission detecting optical system 10 and the transparent stabilizing plate 5 disposed above the optical pickup 4.

The electromagnetic force generated by the coil provided in the two-axis actuator 14 causes the objective lens 12 to move the focus direction (perpendicular direction to the disk 1) and the tracking direction with respect to the uneven guide grooves of the disk 1. (Figure 1
(See the arrow direction in the figure) so as to be able to follow the surface runout of the disk 1 and the eccentricity of the track formed on the disk 1 even if the recording / reproducing apparatus is subjected to vibration or the like. .

The laser beam 11 emitted from the light emission detection optical system 10 is focused by the objective lens 12 and
Is irradiated. The irradiated laser beam 11 is reflected by the recording medium 1b of the disk 1. The reflected light from the recording medium 1b passes through the objective lens 12 again, and
The light is guided to 0, and is detected by a light receiving element (not shown) in the light emission detection optical system 10. Thereby, recording / reproduction of information is performed.

A transparent stabilizing plate 5 is provided above the optical pickup 4, that is, on the surface of the optical pickup 4 on the disk 1 side at a predetermined distance from the disk 1. It works with the transparent stabilizing plate 5. The transparent stabilizing plate 5 is made of a transparent material so as to transmit the laser beam 11 applied to the disk 1 emitted from the optical pickup 4.

The support 6 has an optical pickup 4 fixed at one end, and a suspension 8 having a slider 7 at the end at the other end. The support section 6 is driven by a linear motor (not shown) and guides the optical pickup 4 and the slider 7 to a predetermined position on the disk 1. As a result, the transparent stabilizing plate 5 and the slider 7 linked with the optical pickup 4 move integrally.

The slider 7 is supported by the suspension 8 so as to be swingable in the direction perpendicular to the surface of the disk 1 with respect to the support portion 6, and faces the transparent stabilizing plate 5 with the disk 1 interposed therebetween. The surface of the slider 7 facing the transparent stabilizing plate 5 is a flat surface. When recording / reproducing the disc 1, that is, when the disc 1 is driven to rotate, air flows between the disc 1 and the slider 7 by rotating the disc 1, and the slider 7 has an opposing flat surface. The air pressure between 7 and disk 1 increases. Therefore, the space between the slider 7 and the disk 1 is in a pressurized state. Similarly, when the disk 1 rotates, air flows between the disk 1 and the transparent stabilizing plate 5, and therefore, the space between the disk 1 and the transparent stabilizing plate 5 is in a pressurized state. The slider 7 is swingably supported. For this reason, the slider 7 can move to a position where the air pressure between the disk 1 and the transparent stabilizing plate 5 and the air pressure between the slider 7 and the disk 1 are balanced.

As described above, the space between the slider 7 and the disk 1 and the space between the transparent stabilizing plate 5 and the disk 1 are both in a pressurized state. It rotates while keeping a certain distance from the forming plate 5. This makes it possible to suppress surface runout of the disk 1 during rotation of the disk 1, and to stabilize rotation of the disk 1.

When the slider 7 has a flat surface facing the disk 1 as described above, the rotation of the disk 1 causes air to flow between the disk 1 and the slider 7, causing the slider 7 to slide between the slider 7 and the disk 1. The space between the sliders 7 is in a pressurized state.
Has a groove structure in which air flows out from between the disk 1 and the slider 7 during rotation, the pressure between the slider 7 and the disk 1 is reduced.

Generally, when recording / reproducing information to / from the disc 1, the distance between the disc 1 and the objective lens 12 is kept constant so that the recording medium 1b on the disc 1 is always kept within the focal depth of the objective lens 12. , And focus control for maintaining the laser beam 11 in a focused state is performed.

Here, as shown in FIG.
When the optical pickup 103 and the optical pickup 103 directly face each other without sandwiching anything therebetween, the surface of the optical pickup 103 facing the disk 101 is a surface having a condensing unit such as an objective lens. This surface is a surface with relatively large irregularities. For this reason, during focus control, every time the light condensing means moves, a pressure fluctuation occurs around the light condensing means, and the air pressure between the light condensing means and the disk 101 tends to fluctuate.
Therefore, the movement of the light condensing means causes the disc 1 to move.
01 runs out.

However, according to the above configuration shown in FIG. 1, by disposing the transparent stabilizing plate 5 between the disk 1 and the objective lens 12, the surface on the optical pickup 4 side facing the disk 1 is transparent. It becomes a flat surface of the stabilizing plate 5,
The air pressure between the surface and the disk 1 is equalized. For this reason, even if the objective lens 12 is moved for performing focus control, for example, the fluctuation of the air pressure between the transparent stabilizing plate 5 and the disk 1 is suppressed, and the surface deflection of the disk 1 can be suppressed. .

Further, since the slider 7 is supported so as to be swingable in the vertical direction with respect to the disk 1, the optical pickup 4 having the objective lens 12 is moved, for example, when performing focus control or the like. When the air pressure between the disk 1 and the transparent stabilizing plate 5 fluctuates, the air pressure between the disk 1 and the transparent stabilizing plate 5 and the air pressure between the disk 1 and the slider 7 The air pressure between the disk 1 and the slider 7 can be changed so that

As a result, the objective lens 12 is
, Or the transparent stabilizing plate 5 moves in conjunction with the optical pickup 4, the air pressure between the disk 1 and the transparent stabilizing plate 5, the disk 1 and the slider 7
The slider 7 also advances and retreats with respect to the disc 1 so that the air pressure between the sliders 7 and 8 is balanced. In addition, since the slider 7 has a plane facing the disk 1 (opposed plane), the air pressure between the slider 7 and the disk 1 can be easily and stably balanced. Therefore, the position fluctuation in the vertical direction of the disk 1 due to the pressure fluctuation around the disk 1, that is, the surface runout is suppressed, and even if the two-axis actuator 14 using the existing servo technology is used, the focus control and the laser beam Tracking or the like for causing the disk 11 to follow the track direction of the disk 1 becomes stable and easy.

As a result, even if the objective lens 12 and the optical pickup 4 move, the rotation of the disk 1 can be stabilized, so that even if a thin disk is used as the disk 1, stable and good recording and recording can be performed. It is possible to provide a recording / reproducing device capable of realizing reproduction. Further, since a thin disk can be used, the optical path inside the disk 1 can be shortened,
Can be increased with respect to the inclination of. Therefore, the recording density of the disk 1 can be increased.

The disk 1 is not limited to an optical disk. For example, a magneto-optical disk using a magneto-optical recording medium may be used as the recording medium 1b.

An example of a recording / reproducing apparatus for recording / reproducing using a magneto-optical disk as the disk 1 will be described below with reference to FIG. In order to perform recording on a magneto-optical disk, a recording magnetic field is required. Therefore, it is necessary to apply a recording magnetic field to a portion where the laser beam 11 is focused. Therefore, a magnetic head (magnetic field generating element) 3 is provided on the slider 7.
0 is embedded. The configuration other than the slider 7 having the magnetic head 30 integrally is the same as the configuration shown in FIG.

When information is recorded on the disk 1, the coercive force of the recording medium 1b is reduced by increasing the temperature of the recording medium 1b formed on the disk substrate 1a by the laser beam 11 applied to the disk 1. At this time, a magnetic field is generated by the magnetic head 30 to apply a magnetic field to the disk 1.

The optical pickup 4 includes a light emission detecting optical system 10
The laser beam 11 emitted from the optical disc 1 is focused by the objective lens 12 and irradiated onto the disc 1. As described above, the coercive force of the disk 1 is reduced, and the direction of magnetization on the disk 1 is changed by applying a magnetic field from the magnetic head 30. At this time, the magnetic head 30 and the optical pickup 4 are driven integrally. Thereby, the disk 1
Is recorded.

As described above, the slider 7 is attached to the magnetic head 3
By providing 0, it is possible to provide a recording / reproducing apparatus capable of recording / reproducing information using a magneto-optical disk using a recording medium requiring a magnetic field for recording.

In the configuration shown in FIG. 3, similarly to the configuration shown in FIG. 2, a transparent stabilizing plate 5 is provided, and the slider 7 is arranged so as to face the transparent stabilizing plate 5 with the disk 1 interposed therebetween. Prepare. Accordingly, even if the objective lens 12 or the optical pickup 4 including the objective lens 12 moves, the rotation of the disk 1 can be stabilized by suppressing the pressure fluctuation around the disk 1 and the optical pickup 4. Accordingly, it is possible to provide a recording / reproducing apparatus capable of stably achieving good recording / reproduction even when a thin disk is used as the disk 1.

Further, the objective lens 12 is not limited to a single lens as shown in FIG. 2, and a group lens combining at least two lenses may be used. For example, FIG. 4 shows an example of a configuration using a two-group lens in which two lenses are combined as the objective lens 12 in the recording / reproducing apparatus shown in FIG.

The two-group lens as the objective lens 12 includes a lens 40 and a lens 41. Thereby, the numerical aperture NA of the objective lens 12 can be increased. Specifically, when a two-group lens is used, the numerical aperture NA of the objective lens 12 can be 0.7 or more, and more preferably about 0.8 to 0.95. Therefore, the spot size of the laser beam 11 applied to the disk 1 can be reduced, whereby the recording capacity of the disk 1 can be increased, and the density of the disk 1 can be increased. Thus, a recording / reproducing device suitable for high-density recording / reproducing can be provided.

Although it is possible to increase the numerical aperture NA by using a single lens as the objective lens 12, the use of a two-group lens allows the objective lens 12 having a large numerical aperture NA to be used.
Can be easily manufactured. Therefore, when the numerical aperture NA is 0.7 or more as in this embodiment, the objective lens 12
It is preferable to use a second group lens.

Although FIG. 4 shows an example in which a magnetic head 30 is provided and a magneto-optical disk is used as the disk 1, an optical disk may be used. In this case, the magnetic head 30 is unnecessary.

Further, as shown in FIG. 5, the transparent stabilizing plate 5 may be fixed to the optical pickup 4 via a leaf spring 50 (elastic member). The configuration shown in FIG. 5 is a configuration in which a leaf spring 50 is added between the transparent stabilizing plate 5 and the optical pickup 4 in addition to the configuration of the recording / reproducing apparatus shown in FIG.

As shown in FIG. 5, the transparent stabilizing plate 5 is fixed to the optical pickup housing 15 via a leaf spring 50. According to the configuration shown in the figure, even when the slider 7 vibrates due to external vibration and the disk 1 is pushed by the pressure between the disk 1 and the slider 7 and vibrates with the vibration of the slider 7, By the expansion and contraction of the leaf spring 50, the vibration of the disc 1 is adjusted by the vibration of the disc 1 so that the air pressure between the disc 1 and the transparent stabilization board 5 and the air pressure between the disc 1 and the slider 7 are balanced. 5 can follow.

Therefore, it is possible to prevent the disk 1 from being damaged by the collision between the disk 1 and the transparent stabilizing plate 5 due to the external vibration.

The material of the leaf spring 50 is not limited to a spring as long as it has elasticity, and rubber, foamable resin, or the like may be used. Here, the spring is a concept including a spring. This spring is preferable in that it can largely displace the load.

Embodiment 2 Another embodiment of the present invention will be described below with reference to FIGS. 6 to 10. Note that components having the same functions as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

FIG. 6 is a cross-sectional view of a main part of the recording / reproducing apparatus according to the present embodiment, which is obtained by adding a stabilizing plate (second stabilizing plate) 60 to the configuration shown in FIG. is there. FIG. 7 is a plan view of the stabilizing plate 60. FIG.
5 is a sectional view of a main part of the recording / reproducing apparatus taken along a radial center line of a stabilizing plate 60 in a second opening 62 described later.

The stabilizing plate 60 is larger than the transparent stabilizing plate 5 and has, for example, a circular shape slightly larger than the disk 1 as shown in FIG. Further, the stabilizing plate 60 is used to arrange the first opening 61 for chucking the center hub 2 of the disk 1 to the spindle 3 and the optical pickup 4 having the transparent stabilizing plate 5 close to the disk 1. And a second opening 62. In the recording / reproducing apparatus, the stabilizing plate 60 is fixed to a position where the space between the stabilizing plate 60 and the disk 1 can be reduced when the disk 1 rotates.

As described above, separately from the slider 7 and the transparent stabilizing plate 5, by disposing the stabilizing plate 60 which is larger than the slider 7 and the transparent stabilizing plate 5 so as to be close to and opposed to the disk 1, the disk 1 can be rotated. In the meantime, air flows out from the outer peripheral end of the stabilizing plate 60,
The air pressure between 0 and disk 1 decreases. As a result, the pressure between the disk 1 and the outer peripheral end of the stabilizing plate 60 is reduced. At this time, since the disk 1 has flexibility, the disk 1 is attracted to the stabilizing plate 60 and rotates while keeping the distance between the disk 1 and the stabilizing plate 60 constant.

As a result, when compared with the stabilizing plate 60, it is arranged in the second opening 62, so that air flows between the disk 1 and the disk 1 during one rotation, and the pressurized state at this time is reduced. Rather than stabilizing the rotation of the disc 1 by only the transparent stabilizing plate 5 and the slider 7 that stabilize the rotation of the disc 1, the stabilizing plate 6 is further improved.
When 0 is provided, the rotation of the disk 1 is more stable. Therefore,
The surface deflection of the disk 1 during rotation of the disk 1 can be further suppressed, and the rotation of the disk 1 at a position distant from the slider 7 and the transparent stabilizing plate 5 that may move during focus control or the like can be stabilized. Can be achieved.

Therefore, for example, when the optical pickup 4 moves during the focus control, the air pressure between the disk 1 and the transparent stabilizing plate 5 and the air pressure between the disk 1 and the slider 7 are increased. Even when the transparent stabilizing plate 5 and the slider 7 move so as to be balanced, the rotation of the disk 1 at a position distant from the transparent stabilizing plate 5 and the slider 7 is stable. In addition, the influence of pressure fluctuation due to the movement of the slider 7 is small, and the runout of the disk 1 is further suppressed. As a result, even when the two-axis actuator 14 using the existing servo technology is used, focus control, tracking, and the like become stable and easy, and more stable and good recording / recording is achieved.
It is possible to provide a recording / reproducing device capable of realizing reproduction.

In order to make the space between the disk 1 and the stabilizing plate 60 decompressed and rotate the disk 1 stably, the distance between the disk 1 and the stabilizing plate 60 must be 10
It is desirable that the thickness be not less than μm and not more than 200 μm.

The positional relationship between the optical pickup 4 and the transparent stabilizing plate 5 and the slider 7 with the disk 1 interposed therebetween may be upside down with respect to the disk 1, and the slider 7 may be positioned below the disk 1 (the stabilizing plate of the disk 1). 60 side), the second opening 62 in the stabilizing plate 60 serves as an opening for disposing the slider 7 close to the disk 1.

Further, as shown in FIG. 8, the stabilizing plate 60 may be constituted by the inner wall surface of the cartridge 80 for storing the disk 1.

FIG. 8 is a cross-sectional view showing a configuration of a main part when the recording / reproducing apparatus shown in FIG. 1 records / reproduces information on / from the disk 1 of the disk cartridge 85. here,
The disk cartridge 85 is the cartridge 80 that houses the disk 1. As shown in the drawing, the lower surface of the cartridge 80 (the surface of the cartridge 80 facing the disk 1 on the optical pickup 4 side) is a stabilizing plate portion 80 a as the stabilizing plate 60. I have. That is, the lower surface of the cartridge 80 functions as the stabilizing plate 60. 8 is the same as FIG.
5 is a cross-sectional view of a main part of the recording / reproducing apparatus taken along a radial center line of the disk 1 at a second opening 82 shown in FIG.

The stabilizing plate portion 80a is provided with a first hub for chucking the center hub 2 of the disk 1 to the spindle 3.
It has an opening 81 and a second opening 82 for disposing the optical pickup 4 having the transparent stabilizing plate 5 close to the disk 1. The upper surface of the cartridge 80 (of the surface of the cartridge 80 facing the disc 1,
The slider 7 has a third opening 83 at a position facing the second opening 82 for disposing the slider 7 close to the disk 1.

FIG. 9 is a plan view when the cartridge 80 is viewed from the optical pickup 4 side, that is, from the lower surface side of the cartridge 80. As shown in the figure, the cartridge 80 further includes a slide shutter 84 that can be opened and closed in the direction of the arrow in the figure and that can cover the first opening 81 and the second opening 82. The slide shutter 84 is opened when the disc 1 rotates, which requires the first opening 81 and the second opening 82, but is closed when the cartridge 80 containing the disc 1 is taken out of the recording / reproducing apparatus. .

Further, a slide shutter (not shown) is provided on the upper surface of the cartridge 80 so as to cover the opening 83. This slide shutter also has an opening 83
The disk 1 is opened when the disk 1 needs to be rotated, but is closed when the cartridge 80 containing the disk 1 is removed from the recording / reproducing apparatus. Thus, dust on the disk 1 can be prevented.

The lower surface of the cartridge 80 is provided with a stabilizing plate 80.
“a” has the same function as the above-described stabilizing plate 60. That is, the stabilizing plate 60 is constituted by one inner wall surface of the cartridge 80. Thus, when the disk 1 is rotationally driven, the pressure between the disk 1 and the stabilizing plate portion 80a is reduced. At this time, since the disk 1 has flexibility, the disk 1 is attracted to the stabilizing plate portion 80a and rotates while keeping a constant distance between the disk 1 and the stabilizing plate portion 80a. This makes it possible to suppress surface runout of the disk 1 during rotation of the disk 1, and to stabilize rotation of the disk 1 at a position away from the slider 7 and the transparent stabilizing plate 5.

Therefore, for example, when the optical pickup 4 moves, the air pressure between the disk 1 and the transparent stabilizing plate 5 and the air pressure between the disk 1 and the slider 7 become transparent and stable. Even when the plate 5 and the slider 7 move, the rotation of the disk 1 at a position distant from the transparent stabilizing plate 5 and the slider 7 is stable. Less affected by pressure fluctuations due to
Surface runout is further suppressed. As a result, it is possible to provide a recording / reproducing apparatus capable of stably achieving good recording / reproducing.

The lower surface of the cartridge 80 performs the same function as the above-described stabilizing plate 60 as the stabilizing plate portion 80a. Can be stabilized.

In this case as well, the positional relationship between the optical pickup 4 and the transparent stabilizing plate 5 and the slider 7 sandwiching the disk 1 may be upside down with respect to the disk 1, and the slider 7 may be positioned below the disk 1 (stabilizing plate). 80a side), the second opening 82 in the cartridge 80
Is an opening for disposing the slider 7 close to the disk 1, and the third opening 83 is an opening for disposing the optical pickup 4 having the transparent stabilizing plate 5 to the disk 1.

Next, based on FIG.
Will be described with reference to a recording / reproducing apparatus including both inner wall surfaces of a cartridge 90 for accommodating the disk 1.

As shown in FIG. 10, the configuration of the recording / reproducing apparatus is the same as that of FIG.

The lower surface of the cartridge 90 has a stabilizing plate portion 80a shown in FIG.
An opening 81, a second opening 82, a third opening 83, and a slide shutter 84 are provided. A slide shutter (not shown) is provided on the upper surface of the cartridge 90 so as to cover the third opening 83, similarly to the cartridge 80. Thus, dust on the disk 1 can be prevented.

The cartridge 90 differs from the cartridge 80 shown in FIG. 8 in that the surface of the cartridge 90 facing the disk 1 on the slider 7 side (hereinafter referred to as the upper surface of the cartridge 90) and the surface on the optical pickup 4 side. (Hereinafter referred to as the lower surface of the cartridge 90) (the distance between the inner wall surface of both the disc 1 and the cartridge 90) is limited to a range in which the cartridge 90 functions similarly to the stabilizing plate 60. I have.

That is, in order for both the upper and lower surfaces of the cartridge 90 facing the disk 1 to perform the same function as the stabilizing plate 60, the upper and lower surfaces of the cartridge 90 can reduce the pressure between the disk 1 and the space. Must be in position.

Specifically, the disc 1 and the cartridge 9
It is desirable that the distance between the upper surface of the cartridge 0 and the distance between the disk 1 and the lower surface of the cartridge 90 be not less than 10 μm and not more than 200 μm, respectively.

By setting the distance between the disk 1 and the surface of the cartridge 90 facing the disk 1 to be not less than 10 μm, the disk 1 and the cartridge 90 can be separated from each other when an external influence such as vibration occurs. Can be prevented from colliding with each other and causing scratches on the disk 1.

The distance between the disk 1 and the surface of the cartridge 90 facing the disk 1 is 200 μm.
By setting m or less, the disk 1 is less susceptible to external influences such as vibration. That is, since the space in the cartridge 90 is limited, even if vibration is generated outside, the depressurized state between the upper and lower surfaces of the cartridge 90 and the disk 1 is hardly hindered. Thus, every time the disk 1 is affected by external influences such as vibrations, the rotation of the disk 1 in the cartridge 90 becomes unstable, and it is possible to suppress the disk 1 from causing surface runout in the space in the cartridge 90. Therefore, the rotation of the disk 1 can be stabilized.

As described above, by limiting the space of the cartridge 90, both the upper and lower surfaces of the cartridge 90 facing the disk 1 function similarly to the above-described stabilizing plate 60. That is, the reduced pressure state between the disk 1 and the cartridge 90 is stabilized, and the disk 1 is less susceptible to external influences such as vibration. As a result, the disk 1 does not run out in the space in the cartridge 90,
Stable rotation drive can be performed. Further, it is possible to prevent scratches on the surface of the disk 1 due to collision of the disk 1 with the upper and lower surfaces of the cartridge 90.

Therefore, the recording / reproducing apparatus provided with the cartridge 90 is capable of moving from the slider 7 and the transparent stabilizing plate 5 even when the transparent stabilizing plate 5 and the slider 7 are moved by the optical pickup 4 being moved. Further stabilization of the rotation of the disk 1 at a remote position can be achieved. Thereby, good recording and reproduction can be performed more stably.

In addition, the stabilizing plate 60 is
The rotation of the disk 1 can be further stabilized without the need for newly increasing the number of components as the second stabilizing plate 60 by being constituted by the upper and lower surfaces of the disk 1.

Further, since the rotation of the disk 1 can be stabilized as described above, a thin disk can be used as the disk 1. here,
In order to make the disk 1 effectively flexible, the thickness of the disk 1 is desirably 30 μm or more and 400 μm. Since the disk 1 has flexibility,
If the thickness is less than 30 μm, it is difficult to maintain the strength of the disk 1 to withstand rotation. Further, when the thickness of the disk 1 is greater than 400 μm, the flexibility of the disk 1 becomes weak, so that even if the pressure between the disk 1 and the stabilizing plate portion 80a is reduced, the stabilizing plate portion 80
The disk 1 is not attracted to a, and the effect of suppressing surface runout during rotation of the disk 1 is reduced.

In each of the first and second embodiments, the transparent stabilizing plate 5 is used as the first stabilizing plate. However, the present invention does not require the first stabilizing plate to be formed of a transparent member. It is feasible. In each of the following embodiments, instead of the transparent stabilizing plate 5, a condensing means (such as a lens) is provided on the stabilizing plate itself as a first stabilizing plate, and a condensing slider having a function as a slider An example using is described.

[Embodiment 3] Still another embodiment of the present invention will be described with reference to FIGS.
It is as follows. In this embodiment, an optical disk device that records and reproduces information on an optical disk will be described as a recording and reproducing device.

FIG. 13 is a sectional view of a main part of an optical disk device according to the present embodiment. As shown in the figure, an optical disc device according to the present embodiment includes a spindle (rotation drive unit) 203, a condensing slider 204, an optical pickup 2
05, stabilizing slider 206 and suspension 2
07 and a flexible optical disc 201
(Hereinafter simply referred to as an optical disk) for recording and reproducing information.

The optical disk 201 has the center hub 2
And is rotationally driven by the spindle 203. Here, a condensing slider 204 having a condensing means and a stabilizing slider 206 supported by a suspension 207 are arranged so as to sandwich the optical disc 201.

The suspension 207 is fixed to the optical pickup carriage 208 on the side opposite to the portion where the stabilizing slider 206 is supported. The optical pickup carriage 208 is provided with an optical pickup 205.

The condensing slider 204 is fixed to the slider holder 210 via the first leaf spring 209,
Further, the slider holder 210 is provided with the second leaf spring 2.
11 and is fixed to the optical pickup carriage 208.

The condensing slider 204, the optical pickup 205, and the stabilizing slider 206 are accessed and driven in the radial direction of the optical disk 201 by a linear motor or a swing arm (not shown).

The condensing slider 204 has the same function as the transparent stabilizing plate 5 used as the first stabilizing plate described in the first and second embodiments. The light beam is focused on the optical disk 201. Details of the configuration of the focusing slider 204 will be described later.

The optical disk 201 comprises an optical disk substrate 212, an optical recording medium 213 and a protective coat 214, as shown in FIG.
The light beam 215 emitted from the focusing slider 2
The light is condensed and radiated onto the optical recording medium 213 by the light condensing means fixed to 04, and recording, erasing, and reproduction are performed.

Here, as the optical disk substrate 212,
A flexible resin substrate such as a polyethylene terephthalate (PET) film is used.
A guide groove for tracking is formed by a 2P method or the like on the light beam converging surface.

As the optical recording medium 213, GeSbT
e, InAgSbTe and other phase change recording materials, TbFe
Magneto-optical recording materials such as Co, TbFeCo and GdFe
It is possible to use a super-resolution magneto-optical recording material in which a plurality of layers of Co or the like are stacked or a write-once recording material using a dye-based organic material. Alternatively, a read-only optical disk may be formed in which uneven pits are formed on the optical disk substrate 212 and a reflection film is provided instead of the optical recording medium 213.

When the optical disk 201 comes into contact with the stabilizing slider 206, the protective coat 214
13 is provided for the purpose of damage. As the protective coat 214, for example, an ultraviolet curable resin layer,
Alternatively, a resin layer such as a resin sheet adhesive layer can be used. It is also possible to use a thin film of SiN, AlN, SiC or the like. Further, these protective coats 214
A lubricity coating layer may be further formed thereon.

As shown in FIG. 15, the optical pickup 205 includes a light emitting element 216, a focusing / tracking light receiving element 217, and a reproduction signal detecting light receiving element 218.
An optical pickup 205 having the above optical element is fixedly arranged on an optical pickup carriage 208, and a light beam 215 emitted from the optical pickup 205 is directed toward an optical disk 201 by a rising mirror 219 fixedly arranged on a slider holder 210. Bent into the piezoelectric element 2
The light passes through the first lens 221 and the second lens 222 fixed to the light-collecting slider 204 having the light-irradiating light 20, and is condensed and irradiated onto the optical recording medium 213.

Here, the condensing slider 204 is fixed to the slider holder 210 via the first leaf spring 209, and the condensing slider 204 is pressed by the first leaf spring 209 toward the optical disc 201. Have been. Further, the stabilizing slider 206 is fixed to the optical pickup carriage 208 via the suspension 207, and the stabilizing slider 206 is also pressed in the direction of the optical disk 201. That is, the condensing slider 204 and the stabilizing slider 206 are arranged so as to sandwich the optical disc 201 from both sides.

Therefore, an air bearing is formed between the optical disk 201 and the condensing slider 204 and between the optical disk 201 and the stabilizing slider 206 by the flow of air generated by the rotation of the optical disk 201. In order to balance the air pressure between the optical disc 201 and the focusing slider 204 with the air pressure between the optical disc 201 and the stabilizing slider 206, the optical disc 201 uses the focusing slider 204 and the stabilizing slider 206. In this state, the access drive is performed in the radial direction in a state where the sliders are stably rotated while being kept at a constant interval from both sliders.

The slider holder 210 is fixed to the optical pickup carriage 208 via the second leaf spring 211, and can be driven in the track direction 223 (disc radial direction). The arrangement is such that the slider holder 210 can be driven.

In addition, the optical pickup carriage 20
8, a pair of permanent magnets 224 is fixed, and the permanent magnet 224 and the coil 225 fixed to the slider holder 210 constitute a magnetic circuit. This magnetic circuit moves the slider holder 210 in the track direction 22.
3 is a tracking actuator that can be driven to the third position.
It is driven in the track direction 223 together with 0.

Here, the tracking actuator is, as shown in FIGS.
Focusing / tracking light receiving element 21 in 05
7 is input to a control circuit 227, and the coil 225 is driven by the control signal from the control circuit 227, so that the slider holder 210 is driven (tracked) in the track direction 223. ing.

Here, regarding the focusing slider 204,
This will be described below.

As shown in FIG. 16, the condensing slider 204 is moved by the slider member 228 to the piezoelectric element 22.
0 is sandwiched.

As the slider member 228, for example, a material such as a metal plate, a ceramic plate, and a plastic plate having a thickness of 0.2 to 1.5 mm can be used. The piezoelectric element 220 has a thickness of 0.2 to 1.0.
0 mm laminated piezoelectric element, for example,
It is possible to use a piezoelectric element as described in 820.

Further, a through hole 229 is provided at the center of the slider member 228, and the first lens 221 and the second lens 222 as light condensing means are provided in the through hole 229.
Are arranged in order from the optical disk 201 side.

The first lens 221 and the second lens 222
Is attached so as to sandwich the piezoelectric element 220,
By applying a voltage to the piezoelectric element 220, the first
The distance between the lens 221 and the second lens 222 is controlled. This corrects an abnormal light-collecting state on the optical recording medium 213 caused by a change in the thickness of the optical disk substrate 212 constituting the optical disk 201, a change in the flying height between the optical disk 201 and the light-collecting slider 204, and the like. In order to adjust the distance between the first lens 221 and the second lens 222, that is, focusing is performed.

The above piezoelectric element 220 is shown in FIGS.
As shown in (2), the focus error signal 230 output from the focusing / tracking light receiving element 217 is input to the control circuit 227 and driven by the control signal from the control circuit 227.

In the present embodiment, the through-hole 229 of the condensing slider 204 is provided between the surface of the condensing slider 204 facing the optical disc 201 and the slider holder 2.
10 are formed by forming mortar-shaped depressions whose center lines are aligned with each other on the surface opposed to the through hole 22.
9 with the slope of each mortar-shaped depression as the reference plane,
The first lens 221 and the second lens 222 are fixed to the focusing slider 204 with an adhesive.

Thus, by adhering and fixing the first lens 221 and the second lens 222 to the focusing slider 204, the positioning of both lenses is facilitated and the position of both lenses in the horizontal direction is improved. No shift will occur. Therefore, the tracking causes the first
Even when the lens 221 and the second lens 222 are driven, it is possible to stably achieve a good light-collecting state without causing an optical axis shift between the first lens 221 and the second lens 222. .

Example 1 An example of the optical disk device according to the present embodiment will be described below. In this embodiment, a case in which the present invention is applied to the configuration of the optical disk device shown in FIG. 16 will be described.

The optical disk 201 is an optical disk substrate 212 made of polyethylene terephthalate having a thickness of 50 μm.
An uneven guide track in which a land and a groove having a width of 0.23 μm are formed in a spiral shape is provided thereon, and a 2P resin layer having a thickness of 5 μm and a depth of 20 nm is provided.
On the guide track, ZnS-SiO2 having a thickness of 40 nm was formed.
Interference film, 15 nm thick AgInSbTe phase change recording film, 20 nm thick ZnS—SiO ₂ interference film, 12 film thickness
An optical recording medium 213 made of an Ag reflective film having a thickness of 0 nm is sequentially laminated, and further, a protective coat 214 made of SiC is formed on the optical recording medium.
It was formed with a thickness of nm.

First, as shown in FIG. 1, the optical disk 201 having the above configuration is attached to the spindle 203 and 3000
It was driven to rotate at rpm. In order to realize stable rotation, a stabilizing plate (not shown) is arranged in an area other than the area where the condensing slider 204 and the stabilizing slider 206 are arranged.

Next, the focusing slider 204 and the stabilizing slider 206 are brought close to the optical disc 201,
Due to the rotation of the optical disk 201, the space between the optical disk 201 and the condensing slider 204 and the optical disk 20
An air bearing is formed between the optical disk 201 and the focusing slider 204.
So that the air pressure between the optical disk 201 and the stabilizing slider 206 is balanced with the air pressure between the optical disk 201 and the stabilizing slider 206. Was driven to rotate so that the interval between them was constant. At this time, the distance between the optical disc 201 and the focusing slider 204, and
The distance between the optical disk 201 and the stabilizing slider 206 was about 10 μm.

In this embodiment, the optical pickup 205
A semiconductor laser having a wavelength of 405 nm was used as the light emitting element 216, and the first lens 221 and the second lens 222 were designed such that the effective numerical aperture NA was 0.9. In this configuration, the light beam spot diameter on the optical recording medium 213 in the optimum state was 350 nm.

Here, the semiconductor laser used as the light emitting element 216 is moved from the first lens 221 to the optical recording medium 2.
13 is continuously emitted so that the light emitted to the optical disc 13 becomes 0.5 mW, and the tracking error signal 226 and the focus error signal obtained from the focusing / tracking light receiving element 217 in the optical pickup 205 using the reflected light from the optical disk 201. 230 is input to the control circuit 227. The control circuit 227, based on these input signals,
A pair of focusing control leads 2 to the piezoelectric element 220
31, the focusing control was performed, and the tracking control was performed by supplying power to the coil 225 constituting the tracking actuator through a pair of tracking control leads 232.

With the focusing and tracking performed by the above method, the light emitting element 216 is caused to emit pulse light so that the peak power of the light pulse emitted from the first lens 221 becomes 5 mW, and the AgInSb of the optical recording medium 213 is formed.
Recording marks having a diameter of 0.18 μm were continuously formed on the Te phase change recording film at a pitch of 0.36 μm. After the formation of the recording mark, the light emitting element 216 is continuously lit so that the light emitted from the first lens 221 becomes 0.5 mW,
The change in the amount of reflected light from 1
8 (FIG. 15).
Here, as a result of evaluating the reproduced signal from the reproduced signal detecting light receiving element 218 with a spectrum analyzer, 43 dB was obtained.
The signal-to-noise ratio (CNR) was obtained, and it was confirmed that a reproduced signal usable as a recording / reproducing device was obtained in the optical disk device of the present embodiment.

(Embodiment 2) In the configuration of Embodiment 1, as shown in FIG.
Light for recording and reproduction is incident from the flexible optical disk substrate 212 side, and the light having a diameter of 350
Since a light beam spot of nm was formed and recording / reproducing was performed, there was an occurrence of aberrations due to a change in the thickness of the optical disk substrate 212. To realize stable focusing, the effective numerical aperture of the second group condenser lens was set to 0.9. And

In the second embodiment, as shown in FIG. 17, by arranging light for recording and reproduction from the optical recording medium 213 side, the light condensing optical system (the first lens 221 and the second 2 lens 222) is the optical disk substrate 21
Since the influence of the plate thickness variation of 2 is eliminated, the effective numerical aperture of the second group condenser lens can be made higher than 0.9 of the first embodiment, and the light beam spot diameter can be made smaller.

The optical disc 201 of the second embodiment is
On an optical disk substrate 212 made of polyethylene terephthalate having a thickness of 50 μm, uneven guide tracks in which lands and grooves having a width of 0.20 μm are formed in a spiral shape are provided.
A 5 μm-thick 2P resin layer formed at a depth of 15 nm is provided, and a 120-nm-thick Ag reflection film, a 20-nm-thick ZnS—SiO 2 interference film,
AgInSbTe phase change recording film with a thickness of 15 nm, thickness 4
Optical recording medium 2 made of ZnS-SiO ₂ interference film of 0nm
13 are sequentially laminated, and a protective coat 214 made of SiC is formed with a thickness of 3 nm. The above protective coat 2
In No. 14, the film thickness was extremely thin, and there was no fluctuation in film thickness accompanied by occurrence of aberration.

In the same manner as in FIG. 13, the optical disk 201 is mounted on the spindle 203 and driven to rotate at 3000 rpm, and the distance between the optical disk 201 and the condensing slider 204 and the distance between the optical disk 201 and the stabilizing slider 20 are set.
6 was driven to rotate at a constant distance. The distance between the optical disk 201 and the focusing slider 204, and
The distance between the optical disk 201 and the stabilizing slider 206 is respectively set to the suspension 207 and the first leaf spring 2.
09 by adjusting the pressing force by approx.
And

In the second embodiment, a semiconductor laser having a wavelength of 405 nm is used as the light emitting element 216 in the optical pickup 205, and the first lens 221 and the second lens 222 have an effective numerical aperture NA of 1.0. It was designed to be. In this configuration, the light beam spot diameter on the optical recording medium 213 in the optimum state was 320 nm.

Here, the semiconductor laser used for the light emitting element 216 is continuously emitted so that the light emitted from the first lens 221 becomes 0.4 mW, and the reflected light from the optical disk 201 is used to generate light in the optical pickup 205. The tracking error signal 226 and the focus error signal 230 obtained from the focusing / tracking light receiving element 217 are input to the control circuit 227. The control circuit 227 sends a control signal to the piezoelectric element 220 based on these input signals.
Power is supplied by a pair of focusing control conducting wires 231,
In addition to performing the focusing control, power was supplied to the coil 225 constituting the tracking actuator through a pair of tracking control conducting wires 232 to perform the tracking control.

With the focusing and tracking performed by the above method, the light emitting element 216 is caused to emit pulse light so that the peak power of the light pulse emitted from the first lens 221 becomes 5 mW, and the AgInSb of the optical recording medium 213 is formed.
Recording marks having a diameter of 0.16 μm were continuously formed on the Te phase change recording film at a pitch of 0.32 μm.

After the formation of the recording mark, the light emitting element 21
6 was continuously emitted so that the light emitted from the first lens 221 became 0.4 mW, and reproduction was performed by detecting a change in the amount of reflected light from the optical disk 201 by the light-receiving element 218 for detecting a reproduction signal. Here, as a result of evaluating a reproduced signal from the reproduced signal detecting light receiving element 218 with a spectrum analyzer, a signal-to-noise ratio (CNR) of 45 dB was obtained. It was confirmed that a possible reproduction signal was obtained, and it was found that a CNR higher than that of the first embodiment can be realized in a recording mark smaller than that of the first embodiment.

In the third embodiment, focusing control of the condensing means (first lens 221 and second lens 222) provided on the condensing slider 204 is performed by driving the piezoelectric element 220 provided on the condensing slider 204. However, the present invention is not limited to this. For example, as shown in FIGS. 18 and 19, a permanent magnet 250 and an air-core coil 251 are provided on a surface facing the condensing slider 204 and the slider holder 210. This may be performed using a magnetic circuit.

In FIG. 18, a permanent magnet 250 is provided on the condensing slider 204 side, and an air core coil 251 is provided on the slider holder 210 side to constitute a magnetic circuit for focusing control. In FIG. A permanent magnet 250 is provided, and an air-core coil 251 is provided on the focusing slider 204 side to constitute a magnetic circuit for focusing control.

In any case, when a control signal is supplied to the air core coil 251, the condensing slider 204 is driven in the direction of the optical disk 201 by the magnetic action of the air core coil 251 and the permanent magnet 250. Focusing control is performed by controlling the pressing force of the focusing slider 204 against the optical disc 201 and controlling the distance between the focusing slider 204 and the optical disc 201.

In this case, as described above, the permanent magnet 250
The condensing slider 204 can be driven in the direction of the optical disc 201 by a magnetic circuit constituted by the condensing slider 251 and the air-core coil 251, so that the condensing slider 204 is provided between the slider holder 210 and the condensing slider 204 described in FIG. It is not necessary to provide the first leaf spring 209 for pressing the optical slider 204 toward the optical disk 201.

[Embodiment 4] Still another embodiment of the present invention is described below. In addition,
Members having the same functions as the members described in the third embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 20, the optical disk device according to the present embodiment has a structure in which the first inner wall surface 234 of the optical disk cartridge case 233 and the first 2 inner wall surface 23
5 is used as a stabilizing plate. FIG.
Is an optical disk cartridge case 233 shown in FIG.
FIG.

The optical disk cartridge case 233
Is a first opening 236 for chucking the center hub 202 of the optical disc 201 to the spindle 203 and a second opening 237 for arranging the condensing slider 204 and the stabilizing slider 206 close to the optical disc 201.
And The optical disk cartridge case 233 is provided with a slide shutter 238 that can be opened and closed for the purpose of dust prevention.

In the third embodiment, a stabilizing plate (not shown) is used in order to stabilize the rotation state of the optical disc 201 in a region other than the region sandwiched by the focusing slider 204 and the stabilizing slider 206. In the fourth embodiment, the first inner wall surface 234 and the second inner wall surface 235 of the optical disk cartridge case 233 function as a stabilizing plate for the optical disk 201, thereby realizing stable rotation of the optical disk 201. I have.

As described above, by using the optical disk cartridge case 233, the air pressure between the first inner wall surface 234 and the optical disk 201 and the air pressure between the second inner wall surface 235 and the optical disk 201 within the optical disk cartridge case 233 can be increased. So that the air pressure between
The optical disc 201 is driven to rotate.

Here, the first inner wall surface 234 and the optical disk 2
01, the second inner wall 235 and the optical disc 20.
1 and 10 μm or more and 200 μm, respectively.
By doing so, the optical disk 201 is stably rotated at an intermediate position between the first inner wall surface 234 and the second inner wall surface 235 so that the air pressure is balanced.

When the distance between the optical disk 201 and the first inner wall surface 234 and the distance between the optical disk 201 and the second inner wall surface 235 are smaller than 10 μm, the optical disk 201 is moved to the first inner wall surface 234 or the second inner wall surface 234. 2 inner wall 2
As a result, the surface of the optical disk 201 is damaged.

When the distance between the optical disk 201 and the first inner wall surface 234 and the distance between the optical disk 201 and the second inner wall surface 235 are larger than 200 μm, the optical disk in the optical disk cartridge case 233 is The first inner wall surface 234 and the second inner wall surface 235 cannot function as stabilizing plates because the degree of freedom is increased, and the rotation of the optical disk 201 in the optical disk cartridge case 233 is unstable due to disturbance such as vibration. Becomes

As described above, in the fourth embodiment, the rotation drive of the optical disk 201 is stabilized by the first inner wall surface 234 and the second inner wall surface 235 of the optical disk cartridge case 233, so that the optical disk cartridge The flapping of the optical disk 201 in the case 233 is suppressed, and more stable rotation drive can be realized against disturbance such as vibration.

In the fourth embodiment, the same optical disk 201 as in the third embodiment is used, and the third embodiment is used.
As a result, a signal-to-noise ratio (CNR) of 44.5 dB was obtained, and a reproduction signal usable as a recording / reproduction device in the optical disk device of Embodiment 4 using the optical disk cartridge case 233 was obtained. Was confirmed to be obtained.

It is apparent that the optical disk cartridge case 233 according to the fourth embodiment can be applied to the optical disk device having the configuration of the second embodiment in the third embodiment.

In the first to fourth embodiments, a recording disk (optical disk) not using magnetism is used as the recording / reproducing device.
Although the optical disk apparatus for recording / reproducing information to / from the apparatus has been described, the present invention is not limited to this, and records / reproduces information to / from a recording disk (magneto-optical disk) using magnetism. The present invention is also applicable to a magneto-optical disk device. This magneto-optical disk device will be described in the following fifth embodiment.

[Embodiment 5] Still another embodiment of the present invention is described below. In addition,
In the present embodiment, members having the same functions as those described in the third and fourth embodiments are denoted by the same reference numerals, and description thereof will be omitted. The optical disk device described in the present embodiment is a device for recording and reproducing information on a magneto-optical disk, that is, a magneto-optical disk device.

As shown in FIG. 22, the magneto-optical disk device according to the present embodiment includes a magnetic core 239 and a magnetic coil 240 in a stabilizing slider 206 of the optical disk device shown in FIG. Magnetic head 2
41 is embedded. Other configurations are the same as those of the optical disk device shown in FIG.

In this embodiment, the magnetic head 241
A magnetic head in which a magnetic coil 240 using a conductive wire having a diameter of 40 μm was wound around a cylindrical magnetic core 239 having a diameter of 0.2 mm was used.

The magnetic coil 240 of the magnetic head 241
Are connected to the stabilizing slider 206.
In order to improve the smoothness of the surface of the
6 from the suspension 207 side, and by applying a voltage to the lead wire 242, the magnetic coil 2
An electric current is passed through 40 to generate a recording magnetic field.

The magneto-optical disk (hereinafter referred to as an optical disk) 201 has a width of 0.23 μm on an optical disk substrate 212 made of polyethylene terephthalate having a thickness of 50 μm.
An uneven guide track in which a land and a groove of m are formed in a spiral shape has a thickness of 5 μm and a depth of 20 nm.
m 2P resin layer, and a 40 nm-thick AlN interference film and a 30 nm-thick Gd
FeCo reproducing layer, AlN intermediate layer having a thickness of 5 nm, thickness of 30
A super-resolution magneto-optical recording medium 213 composed of a TbFeCo recording film having a thickness of 20 nm, a SiN interference film having a thickness of 20 nm, and an Ag reflection film having a thickness of 120 nm is sequentially laminated. It was formed with a thickness.

Therefore, the optical disk 201 having the above configuration
Is a super-resolution magneto-optical disk in which the magnetization information of the recording layer only in the region where the temperature has increased is transferred to the reproducing layer by magnetostatic coupling.

Further, this optical disk 201 is replaced with the optical disk cartridge case 233 shown in the fourth embodiment.
May be inserted to realize stabilization of rotation. In this case, the optical disc 201 inserted in the optical disc cartridge case 233 is
Recording and reproduction were performed using a condensing slider 204 having the same first lens 221 and second lens 222 as described above, and a stabilizing slider 206 in which a magnetic head 241 was embedded.

Here, after focusing and tracking are performed with the power of the light emitted from the first lens 221 at 0.5 mW, pulse emission is performed so that the peak power of the light emitted from the first lens 221 becomes 6 mW. An AC voltage is applied to the lead wire 242, a recording magnetic field of about 20 kA / m is generated by the magnetic head 241 to perform optical pulse magnetic field modulation recording, and a recording mark having a length of 0.1 μm is formed on the TbFeCo recording film by 0.2 μm. It was formed continuously at a pitch.

After forming the recording mark, the light emitting element 21
6 was continuously emitted so that the light emitted from the first lens 221 became 0.5 mW, and reproduction was performed by detecting the polarization state of the reflected light from the optical disk 201 by the light-receiving element 218 for reproduction signal detection. Here, as a result of evaluating the reproduced signal from the reproduced signal detecting light receiving element 218 with a spectrum analyzer, a signal-to-noise ratio (CN) of 44.5 dB was obtained.
R) was obtained, and it was confirmed that a reproduced signal usable as a recording / reproducing device was obtained in the magneto-optical disk device of the present embodiment.

In the present embodiment, as shown in FIG.
Although the example in which recording and reproduction are performed by making the light beam 215 incident from the side has been described, the present invention is not limited to this, and as shown in FIG.
Recording and reproduction may be performed by inputting light from the side,
In this case, there is an effect that the recording density can be increased by using the second group lens having a higher numerical aperture.

The magnetic field generating element is connected to the stabilizing slider 2.
In the following, an example in which the light-emitting device is provided on the focusing slider 204 side instead of the light-emitting device 06 will be described with reference to the magneto-optical disk device shown in FIGS.

In the magneto-optical disk device shown in FIG. 23, an air-core coil 243 for supplying a recording magnetic field to the optical recording medium 213 is provided so as to surround the first lens 221 fixed to the focusing slider 204. I have. In the present embodiment, the focusing slider 204 has an inner diameter of 0.15 m.
An air-core coil 243 is formed by forming a donut-shaped depression having a diameter of 1.5 mm, an outer diameter of 1.5 mm, and a depth of 0.5 mm, and spirally winding a conductive wire having a diameter of 40 μm in the depression.

The lead wire 244 of the air core coil 243
In order to improve the smoothness of the slider surface, the condensing slider 204 is taken out from a 0.2 mm-diameter conducting wire passage hole 245 formed in the recessed portion of the condensing slider 204 to the surface of the condensing slider 204 facing the slider holder 210. By applying a voltage to the lead wire 244, the air-core coil 2
A current flows through 43 to generate a recording magnetic field.

Also in this embodiment, the optical disk 201 was housed in the same optical disk cartridge case 233 as in the third embodiment, and the recording / reproducing performance was measured. Note that the same first lens 221 and second lens 222 as in Embodiment 3 were used as the light collecting means.

After focusing and tracking are performed with the power of the light emitted from the first lens 221 at 0.5 mW, pulse light emission is performed by the light emitting element 216 so that the peak power of the light emitted from the first lens 221 becomes 6 mW. At the same time, an AC voltage is applied to the lead wire 244, a recording magnetic field of about 10 kA / m is generated by the air core coil 243, and optical pulse magnetic field modulation recording is performed.
A recording mark having a length of 0.1 μm is formed on the eCo recording film by 0.2 μm.
It was formed continuously at a pitch of μm.

After forming the recording mark, the light emitting element 216 is moved to the first position.
The emitted light from the lens 221 is continuously emitted so as to be 0.5 mW, and the polarization state of the reflected light from the optical disc 201 is
Reproduction was performed by detection by the reproduction signal detecting light receiving element 218. Here, the reproduction signal detecting light receiving element 21
As a result of evaluating the reproduced signal from No. 8 with a spectrum analyzer, a signal-to-noise ratio (CNR) of 41 dB was obtained, and it was confirmed that a reproduced signal usable as a recording / reproducing device was obtained in the present magneto-optical disk device. did.

Also in this case, in the magneto-optical disk device shown in FIG.
Although an example is shown in which recording and reproduction are performed by making light incident, the present invention is not limited to this, and as shown in FIG. 17 of the third embodiment, light may be made incident from the optical recording medium 213 side. Good. In this case, there is an effect that the recording density can be increased by using the second group lens having a higher numerical aperture.

Further, in the magneto-optical disk device shown in FIG. 23, an example is shown in which the air-core coil 243 is provided as a magnetic field generating element on the focusing slider 204, but the applied magnetic field strength (recording magnetic field strength) is further increased. For example,
This will be described below with reference to FIG.

The magneto-optical disk drive shown in FIG.
In addition to the configuration of the magneto-optical disk apparatus shown in FIG. 3, a soft magnetic material 246 is embedded in the stabilizing slider 206 in order to increase the recording magnetic field strength.

In the present embodiment, the soft magnetic material 246 is used.
Recording and reproduction were performed using MnZn ferrite. As described above, by embedding the soft magnetic material 246 in the stabilizing slider 206, the soft magnetic material 246 is magnetized by the magnetic field generated from the air-core coil 243, and the optical recording medium 213 on which recording is to be performed is more easily performed. A large magnetic field can be applied. By applying a voltage to the air-core coil 243 under the same conditions as the magneto-optical disk device shown in FIG. 23, a recording magnetic field of 20 kA / m could be generated.

In the magneto-optical disk device shown in FIG. 24, similarly to the magneto-optical disk device shown in FIG. 23, a recording mark having a length of 0.1 μm is formed on the TbFeCo recording layer of the optical recording medium 213 by magnetic field modulation recording. .2 μm pitch, and the reproduction signal from the reproduction signal detecting light receiving element 218 was evaluated by a spectrum analyzer.
A signal to noise ratio (CNR) of 5 dB was obtained. Therefore, it was found that the magneto-optical disk device shown in FIG. 24 can obtain a higher quality reproduced signal than the magneto-optical disk device shown in FIG.

In the magneto-optical disk device shown in FIG. 24, as shown in FIG. 16 of the third embodiment, an example in which a light beam 215 is incident from the optical disk substrate 212 side to perform recording and reproduction has been described. It is not limited to
As shown in FIG. 17 of the third embodiment, the optical recording medium 2
Recording and reproduction may be performed by making light incident from the 13 side. In this case, there is an effect that the recording density can be increased by using the second group lens having a higher numerical aperture.

[0219]

As described above, the recording / reproducing apparatus of the present invention is a recording / reproducing apparatus for irradiating a rotating disk with a laser beam to record / reproduce information. In this configuration, a stabilizing slider having an opposing flat surface, which is arranged and swingably supported, is provided.

Thus, when the disk rotates, air flows between the disk and the stabilizing slider due to the rotation of the disk. Further, since the stabilizing slider has an opposing flat surface, the stabilizing slider and the disk can be connected to each other. An air bearing is formed between them. Moreover, since the stabilizing slider is swingably supported, it can always move to a position at a fixed distance from the disk when the disk rotates.

Therefore, the disk rotates while the distance between the stabilizing slider and the disk is kept constant. As a result, even if the disk rotates at a high speed, the surface runout of the disk can be suppressed, so that there is an effect that recording and reproduction can be performed stably.

[0220] Further, a stabilizing plate may be provided so as to face the stabilizing slider via the disk.

As a result, an air bearing is also generated between the stabilizing plate and the disk when the disk is rotated, like an air bearing is generated between the stabilizing slider and the disk. At this time, the pressure between the stabilizing slider and the disk is balanced with the pressure between the stabilizing plate and the disk, and the disk rotates while maintaining a constant distance from the stabilizing slider and the stabilizing plate. . This allows
It is possible to suppress the surface runout of the disk during the rotation of the disk, and to further stabilize the rotation of the disk.

The stabilizing plate is swingably supported.
It may be constituted by a slider having an opposing surface.

As a result, like the stabilizing slider,
Since the stabilizing plate is a slider that is swingably supported, the stabilizing plate can always move to a position at a fixed distance from the disk when the disk rotates. Therefore, the disk rotates while the distance between the stabilizing plate and the disk is kept constant. As a result, even if the disk rotates at a high speed, the runout of the disk can be suppressed, so that recording / reproduction can be performed stably.

Therefore, by using the stabilizing plate as a slider in addition to the stabilizing slider, it is easy to keep the distance between the disk, the stabilizing slider and the stabilizing plate constant during the rotation of the disk. That is, there is an effect that it is possible to easily provide a recording / reproducing apparatus capable of performing stable recording / reproducing while suppressing the surface runout of the disk during rotation of the disk.

The slider may be a condensing slider provided with a condensing means for condensing the laser beam irradiated on the disk.

Thus, by providing the slider with the focusing means, it is possible to suppress the surface deflection of the disk due to the pressure fluctuation due to the movement of the focusing means by the slider. That is, since the slider also moves in the same direction with the movement of the light-collecting means, it is possible for the slider to absorb pressure fluctuations caused by the light-collecting means, and to suppress surface runout when the disk rotates. As a result, recording and reproduction can be performed stably when the disk is rotating.

A first lens and a second lens as light condensing means are arranged at a predetermined distance on the condensing slider, and a piezoelectric element layer for controlling the distance between the first lens and the second lens is provided. May be provided.

Thus, by using a two-group lens composed of a first lens and a second lens as the light condensing means, the light for recording / reproduction is condensed and irradiated, thereby increasing the numerical aperture and reducing the numerical aperture. The light beam spot diameter can be realized, and the recording density can be improved. By controlling the distance between the first lens and the second lens by the piezoelectric element layer, it is possible to correct the defocus due to the distribution of the thickness of the substrate or the thickness of the coat layer.

The stabilizing slider may be provided with a magnetic field generating element for generating a magnetic field.

As a result, the present invention can be applied to a magneto-optical disk using a recording medium requiring a magnetic field for recording.

Further, an air core coil as a magnetic field generating element for generating a magnetic field may be provided on the stabilizing plate.

Further, a soft magnetic material may be provided on the stabilizing slider in a state where an air-core coil for generating a magnetic field is provided on the stabilizing plate.

In this case, the strength of the recording magnetic field applied to the magneto-optical disk can be increased by the respective magnetic fields of the air-core coil provided on the stabilizing plate and the soft magnetic material provided on the stabilizing slider. This has the effect that the quality of the reproduced signal can be improved.

Further, the disk cartridge of the present invention
As described above, the disk cartridge used in each of the recording / reproducing apparatuses is housed in the cartridge, and the disk is exposed at the time of recording / reproduction. And a stabilizing plate capable of reducing the space between the disk and the disk.

As a result, the stabilization plates formed on both inner wall surfaces of the disk cartridge further suppress the surface runout during the rotation of the disk, thereby realizing more stable and good recording and reproduction. it can.

At this time, the distance between the inner wall surface of both the disk and the disk cartridge case is 10 μm.
By setting the length to m or more and 200 μm or less, there is an effect that the rotation of the disk can be stabilized.

As described above, the recording / reproducing apparatus of the present invention
A first stabilizing plate disposed between the disk and the light condensing means and interlocking with the light condensing means, and disposed so as to face the first stabilizing plate with the disk interposed therebetween and swingably supported; Be done
And a slider having an opposing flat surface.

As a result, the space between the slider and the disk and the space between the first stabilizing plate and the disk are both in a pressurized state. Rotate while maintaining the interval. Therefore, it is possible to suppress the surface runout of the disk during the rotation of the disk, and to stabilize the rotation of the disk.

By disposing the first stabilizing plate interlocking with the light condensing means between the disk and the light condensing means, the surface of the light condensing means facing the disk becomes a flat surface, and The pressure of the air between the disk and the disk is made uniform.
Therefore, for example, even if the light-collecting unit moves for performing the focus control, the fluctuation of the air pressure between the first stabilizing plate and the disk can be suppressed, and the disk runout can be suppressed.

Further, since the slider is supported so as to be swingable in the vertical direction with respect to the disk, for example, an optical pickup or the like having a condensing means moves, and the slider between the disk and the first stabilizing plate is moved. Even if the air pressure fluctuates, the slider also moves forward and backward with respect to the disk so that the air pressure between the disk and the first stabilizing plate and the air pressure between the disk and the slider are balanced. Moving. Moreover, since the slider also has an opposing plane,
The mutual air pressure can be easily and stably balanced.
Therefore, the runout of the disk due to the pressure fluctuation around the disk is suppressed, and, for example, focus control and tracking are stabilized and facilitated.

As a result, the rotation of the disk can be stabilized even if the light condensing means or the optical pickup provided with the light condensing means moves. -It is possible to provide a recording / reproducing apparatus capable of realizing reproduction.

The recording / reproducing apparatus of the present invention has a configuration in which the first stabilizing plate is fixed to the light condensing means via an elastic member having elasticity.

Accordingly, even when the slider vibrates due to external vibration and the disk is pressed by the pressure between the disk and the slider and vibrates with the vibration of the slider, the elastic member expands and contracts. This has the effect of preventing damage to the disk due to collision between the disk and the first stabilizing plate due to external vibration.

In the recording / reproducing apparatus of the present invention, the light condensing means is a group lens combining at least two lenses.

As a result, the numerical aperture NA of the light condensing means can be increased, and the spot size of the laser beam applied to the disk can be reduced. Therefore, the recording capacity of the disk can be increased, and the density of the disk can be increased. As a result, it is possible to provide a recording / reproducing apparatus suitable for high-density recording / reproducing.

In the recording / reproducing apparatus of the present invention, the slider
This is a configuration including a magnetic field generating element that generates a magnetic field.

As a result, there is an effect that a recording / reproducing apparatus capable of recording / reproducing information using a magneto-optical disk using a recording medium requiring a magnetic field for recording can be provided.

The recording / reproducing apparatus of the present invention has a structure in which the first stabilizing plate is transparent.

Thus, even if the first stabilizing plate is arranged between the disk and the light condensing means, the laser light emitted from the light source can be transmitted through the first stabilizing plate, for example, through the aperture. There is an effect that the sheet can be passed through as it is without providing any parts.

The recording / reproducing apparatus of the present invention has a structure in which a second stabilizing plate is further provided at a position facing the disk and at the time of rotating the disk, the space between the disk and the disk can be reduced in pressure. .

As a result, the second stabilizing plate is arranged separately from the slider so as to be close to and opposed to the disk. The pressure can be reduced, and the disk rotates while maintaining a constant distance from the second stabilizing plate. This makes it possible to suppress the runout of the disk during rotation of the disk, and to stabilize the rotation of the disk at a position away from the slider and the first stabilizing plate.

Therefore, for example, by moving the optical pickup provided with the light condensing means, the air pressure between the disk and the first stabilizing plate is balanced with the air pressure between the disk and the slider. Even when the first stabilizing plate and the slider move, the disk is less affected by the pressure fluctuation due to the movement of the first stabilizing plate and the slider, and the disk runout is further suppressed. As a result, it is possible to provide a recording / reproducing apparatus capable of stably achieving good recording / reproducing.

The recording / reproducing apparatus of the present invention has a structure in which the second stabilizing plate has an opening for allowing the slider or the first stabilizing plate to approach the disk during recording / reproducing.

As a result, the slider or the first stabilizing plate can approach the disk during recording and reproduction. Therefore, the disk and the slider, and the disk and the first
There is an effect that the balance of the pressurized state with the stabilizing plate can be stabilized.

The disk cartridge of the present invention is a disk cartridge in which a disk used in the recording / reproducing apparatus is housed in the cartridge and the disk is exposed at the time of recording / reproduction.
A stabilizing plate is formed on one inner wall surface of the cartridge.

As a result, when the disk is driven to rotate, the pressure between the disk and one of the inner wall surfaces of the cartridge is reduced, and the disk rotates while keeping the distance between the inner wall surface of the cartridge and the disk constant. As a result, surface runout of the disk during rotation of the disk can be suppressed, and rotation of the disk at a position distant from the slider and the first stabilizing plate can be stabilized.

Accordingly, for example, when the optical pickup provided with the light condensing means moves, the air pressure between the disk and the first stabilizing plate is balanced with the air pressure between the disk and the slider. Even when the first stabilizing plate and the slider move, the disk is less affected by the pressure fluctuation due to the movement of the first stabilizing plate and the slider, and the runout is further suppressed.

As a result, it is possible to provide a recording / reproducing apparatus capable of stably realizing good recording / reproducing. Further, it is possible to provide a second stabilizing plate without increasing the number of parts. This has the effect of providing a second stabilizing plate for stabilizing the rotation of the disk.

The disk cartridge of the present invention is a disk cartridge in which a flexible disk is stored in the cartridge and the disk is exposed during recording and reproduction. And a second stabilizing plate constituted by both inner wall surfaces of the cartridge is provided at a position where the space between the cartridges can be reduced in pressure.

Thus, when the disk is driven to rotate, the pressure between the inner wall surfaces of both the disk and the cartridge is reduced. At this time, since the disk has flexibility, the disk rotates stably while keeping the distance between both inner wall surfaces of the cartridge constant. Therefore, it is possible to suppress the surface runout of the disk during rotation of the disk, and to provide a second stabilization plate that further stabilizes the rotation of the disk without newly increasing the number of components as a second stabilization plate. This has the effect of being able to be provided.

In the disk cartridge of the present invention, specifically, the distance between the inner wall surface of each of the disk and the cartridge is preferably 10 μm or more and 200 μm or less.

As described above, by setting the distance between the inner wall surface of each of the disk and the cartridge to 10 μm or more, when the influence of vibration or the like is given from the outside,
It is possible to prevent the disk from being hit by the cartridge and causing the disk to be damaged.

When the distance between the inner wall surface of each of the disk and the cartridge is set to 200 μm or less, the disk is less susceptible to external influences such as vibration. Therefore, every time the disk is affected by external influences such as vibrations, the decompression state between the inner wall surface of the cartridge and the disk is hindered, and the rotation of the disk in the cartridge becomes unstable, and the disk is moved into the space This can suppress the occurrence of surface runout. Accordingly, an effect is obtained that the rotation of the disk can be stabilized.

The disc cartridge of the present invention exposes the disc on both inner wall surfaces of the cartridge at the time of recording and reproduction, and is disposed between the condensing means used in the recording and reproducing apparatus and the disc. A first stabilizing plate interlocking with the means, and a slider having an opposing plane, which is disposed so as to face the first stabilizing plate across the disc and is swingably supported, is provided on the disc. This is a configuration in which an opening for approaching is formed.

As a result, the slider and the first stabilizing plate can approach the disk. Therefore, there is an effect that the balance between the pressurized state of the disc and the slider and the pressurized state of the disc and the first stabilizing plate can be further stabilized.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a configuration of a main part of a recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing a configuration of a main part of the recording / reproducing device shown in FIG.

FIG. 3 is an enlarged cross-sectional view showing a configuration of a main part when a magneto-optical disk is used in the recording / reproducing apparatus shown in FIG.

FIG. 4 is an enlarged cross-sectional view showing a configuration of a main part when a second lens unit is used in the recording / reproducing apparatus shown in FIG.

FIG. 5 is an enlarged cross-sectional view showing a configuration of a main part when the transparent stabilizing plate is fixed to the optical pickup via a spring in the recording / reproducing apparatus shown in FIG.

FIG. 6 is a cross-sectional view illustrating a configuration of a main part of a recording / reproducing apparatus according to another embodiment of the present invention.

FIG. 7 is a plan view of a stabilizing plate.

FIG. 8 is a cross-sectional view showing a configuration of a main part when a stabilizing plate of a recording / reproducing apparatus according to another embodiment of the present invention is configured by both inner wall surfaces of a cartridge.

FIG. 9 is a plan view of the cartridge.

FIG. 10 is a cross-sectional view showing a configuration in a case where the space of a disk cartridge is limited in the recording / reproducing apparatus shown in FIG.

FIG. 11 is a cross-sectional view showing a configuration of a main part of a conventional recording / reproducing apparatus.

FIG. 12 is a cross-sectional view showing a configuration of a main part of a recording / reproducing apparatus using a conventional cartridge.

FIG. 13 is a cross-sectional view showing a configuration of a main part of a recording / reproducing apparatus according to another embodiment of the present invention.

14 is an enlarged cross-sectional view illustrating a configuration of a main part of the recording / reproducing device illustrated in FIG.

15 is a plan view showing a configuration of a main part of the recording / reproducing apparatus shown in FIG.

16 is an explanatory diagram showing a case where light is emitted from the disk substrate side of the disk in the recording / reproducing apparatus shown in FIG.

17 is an explanatory diagram showing a case where light is irradiated from the protective film side of the disc in the recording / reproducing apparatus shown in FIG.

18 is an enlarged cross-sectional view of a main part showing a configuration in a case where focusing control is performed by a method different from the focusing control shown in FIG. 13 in the printing apparatus shown in FIG.

19 is an enlarged cross-sectional view of a main part showing a configuration in a case where focusing control is performed by a method different from the focusing control shown in FIG. 13 in the recording apparatus shown in FIG.

FIG. 20 is a cross-sectional view showing a configuration of a main part when a stabilizing plate of a recording / reproducing apparatus according to another embodiment of the present invention is configured by both inner wall surfaces of a cartridge.

FIG. 21 is a plan view of the cartridge.

22 is an enlarged cross-sectional view showing a configuration of a main part when a magneto-optical disk is used in the recording / reproducing apparatus shown in FIG.

23 is an enlarged cross-sectional view showing a configuration of a main part when a magneto-optical disk is used in the recording / reproducing apparatus shown in FIG.

24 is an enlarged cross-sectional view showing a configuration of a main part when a magneto-optical disk is used in the recording / reproducing apparatus shown in FIG.

[Explanation of symbols]

 Reference Signs List 1 disk 1a disk substrate 1b recording medium 1c protective layer 2 center hub 3 spindle (rotation driving means) 4 optical pickup 5 transparent stabilizing plate (first stabilizing plate) 6 support 7 slider 8 suspension (biasing means) 10 light emission Detection optical system (light source) 11 Laser light 12 Objective lens (light collecting means) 13 Lens holder 14 Biaxial actuator 30 Magnetic head (magnetic field generating element) 40 Lens (light collecting means) 41 Lens (light collecting means) 50 Leaf spring ( Elastic member) 60 Stabilizing plate (second stabilizing plate) 80 Cartridge 201 Optical disk (disk) 201 Center hub 203 Spindle (rotation driving means) 204 Condensing slider (stabilizing plate) 205 Optical pickup 206 Stabilizing slider 207 Suspension ( Biasing means) 209 First leaf spring Reference Signs List 10 slider holder 211 second leaf spring 212 optical disk substrate 213 optical recording medium 214 protective coat 215 light beam 216 light emitting element (light source) 220 piezoelectric element (piezoelectric layer) 221 first lens (light collecting means) 222 second lens (light collecting) Means) 233 Optical disk cartridge case 241 Magnetic head (magnetic field generating element) 243 Air core coil (magnetic field generating element) 246 Soft magnetic material (magnetic field generating element)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G11B 11/105 566 G11B 11/105 566A 571 571G 21/21 101 21/21 101Z 23/033 102 23/033 102B F term (reference) 5D075 AA03 CD17 CD20 CF10 FH06 5D091 AA09 CC24 FF20 HH20 5D118 AA13 BA01 BB01 BB06 FA49 5D119 AA09 AA21 BA01 BB01 BB05 JA43 MA30

Claims (22)

[Claims] 1. A recording / reproducing apparatus for recording / reproducing information by irradiating a disk in a rotating state with a laser beam, wherein the recording / reproducing apparatus is arranged to face the disk and swingably supported. And a stabilizing slider having an opposing flat surface is provided. 2. The recording / reproducing apparatus according to claim 1, further comprising a stabilizing plate disposed so as to face the stabilizing slider via the disk. 3. The stabilizing plate is swingably supported.
3. The recording / reproducing apparatus according to claim 2, comprising a slider having an opposing surface. 4. The recording / reproducing apparatus according to claim 3, wherein said slider is a condensing slider provided with a condensing means for condensing the laser beam irradiated on said disk. 5. A condensing slider, wherein a first lens and a second lens as condensing means are arranged at a predetermined interval,
5. The recording / reproducing apparatus according to claim 4, further comprising a piezoelectric element layer for controlling a distance between the first lens and the second lens. 6. A recording / reproducing apparatus according to claim 1, wherein said stabilizing slider is provided with a magnetic field generating element for generating a magnetic field. 7. The recording / reproducing apparatus according to claim 2, wherein the stabilizing plate is provided with an air-core coil for generating a magnetic field. 8. The recording / reproducing apparatus according to claim 7, wherein said stabilizing slider is provided with a soft magnetic material. 9. A disk cartridge in which a disk used in the recording / reproducing apparatus according to claim 1 is housed in a cartridge, and the disk is exposed during recording / reproduction. A disc cartridge, wherein an inner wall surface of the cartridge is a stabilizing plate capable of reducing a space between the disc and the disc when the disc is rotated. 10. The distance between the inner wall surface of both the disk and the disk cartridge case is 10 μm or more and 2 μm or more.
10. The disk cartridge case according to claim 9, wherein the thickness is not more than 00 μm. 11. A recording / reproducing apparatus comprising: a light source; a condensing means for converging and irradiating a laser beam emitted from the light source onto a disc; and a rotary driving means for rotating the disc. A first stabilizing plate disposed between the first stabilizing plate and the light converging unit, and interlocking with the light converging unit. A recording / reproducing apparatus, comprising: a slider having an opposed flat surface supported by the slider. 12. The recording / reproducing apparatus according to claim 11, wherein the first stabilizing plate is fixed to the light-collecting means via an elastic member having elasticity. 13. The apparatus according to claim 1, wherein the condensing means is a group lens obtained by combining at least two lenses.
13. The recording / reproducing apparatus according to 1 or 12. 14. The recording / reproducing apparatus according to claim 11, wherein the slider includes a magnetic field generating element for generating a magnetic field. 15. The recording / reproducing apparatus according to claim 11, wherein the first stabilizing plate is transparent. 16. A disk drive according to claim 11, wherein a second stabilizing plate is further provided at a position facing the disk and capable of reducing the space between the disk and the disk when the disk is rotated. 16. The recording / reproducing apparatus according to any one of 15 to 15 above. 17. The recording / reproducing apparatus according to claim 16, wherein the second stabilizing plate has an opening for allowing the slider or the first stabilizing plate to approach the disk during recording / reproducing. apparatus. 18. A disc used in the recording / reproducing apparatus according to claim 16 is housed in a cartridge,
Also, a disc cartridge in which a disc is exposed at the time of recording / reproducing, wherein a second stabilizing plate for the disc is constituted by one inner wall surface of the cartridge. 19. A disk cartridge in which a disk is housed in a cartridge and the disk is exposed at the time of recording / reproducing, wherein the space between the disk and the disk can be decompressed when the disk rotates. A disc cartridge characterized in that a second stabilizing plate constituted by both inner wall surfaces of the cartridge is provided at a position. 20. The distance between the inner wall surface of each of the disk and the cartridge is 10 μm or more and 200 μm or more, respectively.
20. The disk cartridge according to claim 19, wherein m is equal to or less than m. 21. A disc is exposed on both inner wall surfaces of a cartridge during recording and reproduction, and is disposed between a condensing means used in a recording and reproducing apparatus and the disc, and is interlocked with the condensing means. A first stabilizing plate, disposed so as to face the first stabilizing plate across the disk, and
21. The disk cartridge according to claim 19, wherein an opening is formed for allowing a slider having an opposing flat surface, which is swingably supported, to approach the disk. 22. The recording / reproducing apparatus according to claim 1, wherein said disk has flexibility.