JP2002197701A - Recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recording and reproducing device capable of controlling the wobbling of the surface of an optical disk and realizing stable and excellent recording/reproducing by controlling pressure fluctuations when an object lens and an optical pickup having the object lens move or the like. SOLUTION: A first stabilizing plate 5 which links with the optical pickup is arranged between the disk 1 and the optical pickup. A slider 7 is arranged so as to face the first stabilizing plate 5 across the disk 1. The slider 7 is supported so as to rock and is provided with a facing plane to the disk 1. An opening part 5a through which a laser beam 11 passes is provided on the optical path of the laser beam 11 exited from the optical pickup to the disk 1 in the first stabilizing plate 5. When the disk 1 is rotated, the slider 7 is advanced and withdrawn so that an air pressure between the first stabilizing plate 5 and the disk 1 is balanced with an air pressure between the slider 7 and the disk 1.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 a flexible optical disc. is there.

[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. 12 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. 13, the above-mentioned publication describes a recording / reproducing apparatus using a disk cartridge 106 in which a stabilizing plate 102 is integrally formed.
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 disc 6, the surface deflection of the optical disc 101 during rotation can be suppressed 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. 12 and in 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.

The present invention has been made in view of the above circumstances, and an object of the present invention is to suppress surface fluctuation of an optical disc by suppressing pressure fluctuation when the objective lens moves, and to stably improve the optical disc. It is an object of the present invention to provide a recording / reproducing apparatus capable of realizing various recording / reproducing.

[0018]

In order to solve the above-mentioned problems, a recording / reproducing apparatus according to the present invention focuses a laser beam emitted from the light source on a flexible disk and irradiates the laser beam with the laser beam. A recording / reproducing apparatus comprising: a condensing means for rotating the disc; and a rotation driving means for rotating the disc. A first stabilizing plate disposed between the disc and the condensing means and interlocked with the condensing means. And the first
A slider having an opposing flat surface, which is disposed so as to face the stabilizing plate, and is swingably supported. The first stabilizing plate includes a laser beam on the optical path of the laser beam. An opening through which the light can pass is provided.

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 by balancing them, 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, when the first stabilizing plate is not provided and the disk and the light condensing means are directly opposed to each other without any intervening therebetween, for example, the light condensing means is provided on 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, an optical pickup or the like having a 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 condensing means or the optical pickup having the light condensing 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.

Further, since the first stabilizing plate is provided with an opening through which the laser light can pass on the optical path of the laser light, the material of the first stabilizing plate can transmit the laser light. For example, it is not limited to a transparent material, and an opaque material can be adopted. As described above, the range of selection of the material of the first stabilizing plate is widened, and therefore, the workability is good,
The first stabilizing plate can be made of a material having good durability.

Further, since the first stabilizing plate is provided with the opening, the laser beam can pass through the opening of the first stabilizing plate without being reflected on the surface of the first stabilizing plate. it can. Thereby, the use efficiency of the laser light can be improved. For example, when the first stabilizing plate does not have an opening, and therefore, a part of the laser light is reflected on the surface of the first stabilizing plate. As compared with, the recording and reproduction of information with low optical power can be realized, and the power consumption of the recording and reproducing apparatus can be reduced.

In the recording / reproducing apparatus, it is preferable that the opening has a mortar shape corresponding to the optical path of the laser beam passing through the first stabilizing plate.

According to the above configuration, the size of the portion of the opening that faces the disk can be reduced without blocking the laser beam passing through the first stabilizing plate. Therefore, it is possible to suppress the turbulence of the air generated in the opening when the disk rotates, and it is possible to suppress the turbulence of the air pressure between the disk and the first stabilizing plate. As a result, the disk runout can be suppressed, and the rotation of the disk can be stabilized.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] The following will describe one embodiment of the present invention with reference to FIGS. 1 to 6 and FIG.

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

A first stabilizing plate 5 is provided on the optical pickup 4.
Are fixed integrally. An optical pickup 4 having a first stabilizing plate 5 is provided on one surface of the disk 1 at a predetermined distance, and faces the first stabilizing plate 5 and the optical pickup 4 on the other surface of the disk 1. The slider 7 is disposed at the position where the slider 7 moves. 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. A ROM (Read-On) in which a pit row composed of concave portions is 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 with the light emission detection optical system 10 and the first
It is held between the stabilizing plate 5.

Due to the electromagnetic force generated by the coil provided in the biaxial actuator 14, the objective lens 12 moves 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 light 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.

The first part of the optical pickup 4, that is, the surface of the optical pickup 4 on the disk 1 side,
A stabilizing plate 5 is provided at a predetermined distance from the disk 1, and the optical pickup 4 and the first stabilizing plate 5 are linked.

As shown in FIG. 2, the first stabilizing plate 5 has an opening 5a on the optical path of the laser beam 11, through which the laser beam 11 can pass. The laser light 11 emitted from the light emission detection optical system 10 and irradiated on the disk 1 or reflected from the disk 1 passes through the opening 5a.

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 first stabilizing plate 5 and the slider 7 linked with the optical pickup 4 move integrally.

The slider 7 is swingably supported by the suspension 8 in the direction perpendicular to the surface of the disk 1 with respect to the support portion 6, and faces the first stabilizing plate 5 with the disk 1 interposed therebetween. The surface of the slider 7 facing the first 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, rotation of the disk 1 causes air to flow between the disk 1 and the first stabilizing plate 5, so that the space between the disk 1 and the first stabilizing plate 5 is in a pressurized state. I have. 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 first 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 first stabilizing plate 5 and the disk 1 are both in the pressurized state. 1 Rotate while maintaining a constant distance from the stabilizing 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 move 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 disk 1, the distance between the disk 1 and the objective lens 12 is kept constant so that the recording medium 1b on the disk 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 first 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 formed. Becomes a flat surface of the first 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 to perform focus control, for example, fluctuations in the air pressure between the first stabilizing plate 5 and the disk 1 are suppressed, and surface fluctuation of the disk 1 is suppressed. it can.

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 when performing, for example, focus control or the like. When the air pressure between the disk 1 and the first stabilizing plate 5 fluctuates, the air pressure between the disk 1 and the first 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 the air pressure is balanced.

As a result, the objective lens 12 is
Or the first stabilizing plate 5 moves in conjunction with the optical pickup 4, the air pressure between the disc 1 and the first stabilizing plate 5, the disc 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 satisfactory 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.

Further, the first stabilizing plate 5 has a laser beam 1
Since the opening 5a through which the laser beam 11 can pass is provided on the first optical path, the material of the first stabilizing plate 5 is:
For example, the material is not limited to a transparent material through which the laser beam 11 can be transmitted, and an opaque material can also be used. As described above, the range of selection of the material of the first stabilizing plate 5 is not limited, and therefore, the first stabilizing plate 5 can be made of a material having good workability and high durability.

Further, since the first stabilizing plate 5 has the opening 5a, the laser beam 11 can pass through the opening 5a without being reflected on the surface of the first stabilizing plate 5.
Thereby, the use efficiency of the laser beam 11 can be improved. For example, the first stabilizing plate 5 does not have the opening 5a, so that a part of the laser beam 11 Compared to the case where the light is reflected on the surface, recording and reproduction of information with a lower optical power can be realized, and the power consumption of the recording / reproducing apparatus can be reduced.

Further, the shape of the opening 5a is
Any shape may be used as long as it can pass through, for example, a cylindrical shape, but as shown in FIG. 3, a mortar-shaped shape corresponding to the optical path of the laser beam 11 passing through the first stabilizing plate 5. Is desirable.

Since the opening 5a has a mortar-like shape corresponding to the optical path of the laser light 11 passing through the first stabilizing plate 5, the opening is formed without blocking the laser light 11 in the first stabilizing plate 5. It is possible to reduce the size of the portion facing the disk 1 in 5a. Therefore, turbulence of air generated in the opening 5a during one rotation of the disk can be suppressed, and turbulence in air pressure between the disk 1 and the first stabilizing plate 5 can be suppressed. As a result, the runout of the disk 1 can be suppressed, and the rotation of the disk 1 can be stabilized.

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.

Hereinafter, an example of a recording / reproducing apparatus for recording / reproducing using a magneto-optical disk as the disk 1 will be described 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, the slider 7 has a magnetic head (magnetic field generating element) 4
0 is embedded. The configuration other than the slider 7 having the magnetic head 40 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 40 to apply a magnetic field to the disk 1.

The optical pickup 4 includes a light emission detection 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 40. At this time, the magnetic head 40 and the optical pickup 4 are driven integrally. Thereby, the disk 1
Is recorded.

As described above, the slider 7 has the magnetic head 4
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.

The structure shown in FIG. 4 also has the first stabilizing plate 5 as in the structure shown in FIG. 2, and the slider is arranged so as to face the first stabilizing plate 5 with the disk 1 interposed therebetween. 7 is provided. 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, since the first stabilizing plate 5 has the mortar-shaped opening 5a, it is possible to improve the use efficiency of the laser light 11, and
Since the turbulence of the air pressure between the disc 1 and the first stabilizing plate 5 can be suppressed, the rotation of the disc 1 can be stabilized.

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. 5 shows an example of a configuration in which a two-group lens in which two lenses are combined as the objective lens 12 is used in the recording / reproducing apparatus shown in FIG.

The second lens group as the objective lens 12 includes a lens 50 and a lens 51. 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. 5 shows an example in which a magnetic head 40 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 40 is unnecessary.

Further, as shown in FIG. 6, the first stabilizing plate 5 may be fixed to the optical pickup 4 via a leaf spring 60 (elastic member). The configuration shown in FIG. 6 is a configuration in which a leaf spring 60 is added between the first 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. 6, the first stabilizing plate 5 is fixed to the optical pickup housing 15 via a leaf spring 60. 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 60, the first stable vibration of the disk 1 is maintained so that the air pressure between the disk 1 and the first stabilizing plate 5 and the air pressure between the disk 1 and the slider 7 are balanced. The veneer 5 can follow.

Therefore, the disk 1 and the first
Damage to the disk 1 due to collision with the stabilizing plate 5 can be prevented.

The material of the leaf spring 60 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 as a material in that a large displacement can be obtained with respect to a load.

[Second Embodiment] The following will describe another embodiment of the present invention with reference to FIGS. 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. 7 is a cross-sectional view of a main part of the recording / reproducing apparatus according to the present embodiment, in which the structure shown in FIG.
A stabilizing plate 70 is added. FIG. 7 shows the second
It is a top view of the stabilizing plate 70. FIG. 7 is a sectional view of a main part of the recording / reproducing apparatus taken along a radial center line of the second stabilizing plate 70 in the second opening 72 shown in FIG.

The second stabilizing plate 70 is larger than the first stabilizing plate 5, for example, has a circular shape slightly larger than the disk 1 as shown in FIG. In addition, the second stabilizing plate 70
A first opening 71 for chucking the center hub 2 of the disc 1 on the spindle 3 and a second opening 72 for disposing the optical pickup 4 having the first stabilizing plate 5 close to the disc 1 are provided. Have. The second stabilizing plate 70 faces the disk 1 in the recording / reproducing apparatus,
At the time of one rotation of the disk, the space between the disk 1 and the disk 1 is fixed at a position where the space can be reduced.

As described above, separately from the slider 7 and the first stabilizing plate 5, the second stabilizing plate 7 which is larger than the slider 7 and the first stabilizing plate 5 is provided.
0 is disposed so as to be close to and opposed to the disk 1, so that when the disk 1 is rotationally driven, the disk 1
The pressure between the first and second stabilizing plates 70 can be reduced. At this time, since the disc 1 has flexibility,
The disk 1 is attracted to the stabilizing plate 70 and rotates while keeping the distance between the disk 1 and the second stabilizing plate 70 constant. Thus, the rotation of the disk 1 is more stable than the case where the rotation of the disk 1 is stabilized by attracting the disk 1 by the first stabilizing plate 5 or the slider 7 which moves in conjunction with the optical pickup 4. Therefore, the runout of the disk 1 during rotation of the disk 1 can be suppressed, and the rotation of the disk 1 at a position distant from the slider 7 and the first stabilizing plate 5 can be stabilized.

For example, when the optical pickup 4 moves during the focus control, the air pressure between the disk 1 and the first stabilizing plate 5 and the air pressure between the disk 1 and the slider 7 are increased. The first so that
Even when the stabilizing plate 5 and the slider 7 move, the rotation of the disk 1 at a position distant from the first stabilizing plate 5 and the slider 7 is stable.
The influence of pressure fluctuation due to the movement of the stabilizing plate 5 and the slider 7 is small, and the surface 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 are stabilized and easy, and a recording / reproducing apparatus capable of achieving more stable and good recording / reproduction is provided. can do.

In order to make the space between the disk 1 and the second stabilizing plate 70 in a reduced pressure state and to rotate the disk 1 stably, the distance between the disk 1 and the second stabilizing plate 70 must be reduced. It is desirable that the thickness be 10 μm or more and 200 μm or less.

The positional relationship between the optical pickup 4 and the first 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 second position of the disk 1). (Stabilizing plate 70 side)
, The second opening 7 in the second stabilizing plate 70
Reference numeral 2 denotes an opening for disposing the slider 7 close to the disk 1.

Further, as shown in FIG. 9, the second stabilizing plate 70 may be constituted by the inner wall surface of a cartridge 90 for accommodating the disk 1.

FIG. 9 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 95. here,
The disk cartridge 95 is a cartridge 90 containing the disk 1. As shown in the drawing, the lower surface of the cartridge 90 (the surface of the cartridge 90 facing the disk 1 on the optical pickup 4 side) has a stabilizing plate portion 90 as the second stabilizing plate 70.
a. That is, the lower surface of the cartridge 90 has a function as the second stabilizing plate 70. Note that FIG.
11 is a sectional view of a main part of the recording / reproducing apparatus taken along a radial center line of the disk 1 in the second opening 92 shown in FIG.

The stabilizing plate portion 90a is provided with a first hub for chucking the center hub 2 of the disk 1 to the spindle 3.
It has an opening 91 and a second opening 92 for disposing the optical pickup 4 having the first stabilizing plate 5 close to the disk 1. The upper surface of the cartridge 90 (of the surface of the cartridge 90 facing the disc 1,
The slider 7 has a third opening 93 at a position facing the second opening 92 for disposing the slider 7 close to the disk 1.

FIG. 10 is a plan view when the cartridge 90 is viewed from the optical pickup 4 side, that is, from the lower surface side of the cartridge 90. As shown in the figure, the cartridge 90 can be further opened and closed in the arrow direction in the figure,
The slide shutter 94 that can cover the first opening 91 and the second opening 92 is provided. The slide shutter 94 is opened when the disc 1 rotates, which requires the first opening 91 and the second opening 92.
It is closed when the cartridge 90 containing the disc 1 is taken out of the recording / reproducing apparatus.

A slide shutter (not shown) is provided on the upper surface of the cartridge 90 so as to cover the opening 93. This slide shutter also has an opening 93
Is opened when the disk 1 is required to be rotated, but is closed when the cartridge 90 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 90 has a stabilizing plate 90
The function a is similar to that of the second stabilizing plate 70 described above. That is, the second stabilizing plate 70 is constituted by one inner wall surface of the cartridge 90. Thus, when the disk 1 is driven to rotate, the pressure between the disk 1 and the stabilizing plate portion 90a is reduced. At this time, since the disk 1 has flexibility, the disk 1 is attracted to the stabilizing plate portion 90a, and rotates while keeping the distance between the disk 1 and the stabilizing plate portion 90a constant. As a result, the surface runout of the disk 1 during rotation of the disk 1 can be suppressed, and the disk 1 at a position away from the slider 7 and the first stabilizing plate 5 can be suppressed.
Can be stabilized.

Accordingly, for example, when the optical pickup 4 moves, the air pressure between the disk 1 and the first stabilizing plate 5 and the air pressure between the disk 1 and the slider 7 are balanced. Even when the first stabilizing plate 5 and the slider 7 move, the rotation of the disk 1 at a position distant from the first stabilizing plate 5 and the slider 7 is stable. Less affected by pressure fluctuation due to the movement of the slider 7,
Surface runout of the disk 1 is further suppressed. This allows
It is possible to provide a recording / reproducing apparatus capable of stably achieving good recording / reproducing.

The lower surface of the cartridge 90 functions as the above-described second stabilizing plate 70 as the stabilizing plate portion 90a, thereby increasing the number of parts as the second stabilizing plate 70. In addition, the rotation of the disk 1 can be stabilized.

In this case as well, the positional relationship between the optical pickup 4 and the first 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 (stabilization). (In the plate portion 90 a side), the second opening 92 in the cartridge 90.
Is an opening for disposing the slider 7 close to the disk 1, and the third opening 93 is an opening for disposing the optical pickup 4 having the first stabilizing plate 5 to the disk 1.

Next, based on FIG. 11, the second stabilizing plate 7
A recording / reproducing apparatus in which 0 is constituted by both inner wall surfaces of a cartridge 96 for accommodating the disk 1 will be described.

As shown in FIG. 11, the configuration of the recording / reproducing apparatus is the same as that of FIG. 9, but includes a disk cartridge 97 in which the disk 1 is housed in the cartridge 96 instead of the disk cartridge 95.

The lower surface of the cartridge 96 has a stabilizing plate portion 90a shown in FIG. 10 similarly to the cartridge 90, and has a first opening 91, a second opening 92, a third opening 93, and a slide shutter 94. are doing. A slide shutter (not shown) is also provided on the upper surface of the cartridge 96, like the cartridge 90, so as to cover the third opening 93. Thus, dust on the disk 1 can be prevented.

The cartridge 96 differs from the cartridge 90 shown in FIG. 9 in that the surface of the cartridge 96 facing the disk 1 on the slider 7 side (hereinafter referred to as the upper surface of the cartridge 96) and the surface on the optical pickup 4 side. (Hereinafter referred to as the lower surface of the cartridge 96) (the distance between the inner wall surface of both the disk 1 and the cartridge 96) is limited to a range in which the cartridge 96 functions similarly to the second stabilizing plate 70. are doing.

That is, in order for both the upper and lower surfaces of the cartridge 96 facing the disk 1 to function similarly to the second stabilizing plate 70, the upper and lower surfaces of the cartridge 96 must be
Must be in a position where the space between them can be reduced.

More specifically, the disc 1 and the cartridge 9
6 and the distance between the disk 1 and the lower surface of the cartridge 96 are preferably 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 96 facing the disk 1 to be at least 10 μm, the disk 1 and the cartridge 96 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.

The distance between the disk 1 and the surface of the cartridge 96 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 96 is limited, even if vibration is generated outside, the depressurized state between the upper and lower surfaces of the cartridge 96 and the disk 1 is hardly hindered. Thus, every time the disk 1 is affected by external influences such as vibration, the rotation of the disk 1 in the cartridge 96 becomes unstable, and it is possible to suppress the disk 1 from running out in the space in the cartridge 96. Therefore, the rotation of the disk 1 can be stabilized.

As described above, by limiting the space of the cartridge 96, both the upper and lower surfaces of the cartridge 96 facing the disk 1 perform the same function as the second stabilizing plate 70 described above. That is, the disc 1 and the cartridge 96
And the disk 1 is less susceptible to external influences such as vibration. Thereby, the disk 1
Does not cause surface runout in the space inside the cartridge 96, and can perform stable rotational driving. 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 96.

Therefore, the recording / reproducing apparatus provided with the cartridge 96 can be used, for example, even when the first stabilizing plate 5 and the slider 7 are moved by the movement of the optical pickup 4. The rotation of the disk 1 at a position away from the disk 5 can be further stabilized. Thereby, good recording and reproduction can be performed more stably.

Further, since the second stabilizing plate 70 is constituted by the upper and lower surfaces of the cartridge 96, the second
Without increasing the number of parts as a new stabilizing plate 70,
The rotation of the disk 1 can be further stabilized.

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 90a is reduced, the stabilizing plate portion 90
The disk 1 is not attracted to a, and the effect of suppressing surface runout during rotation of the disk 1 is reduced.

[0098]

As described above, the recording / reproducing apparatus of the present invention is provided between the disk and the light condensing means, and the first stabilizing plate interlocked with the light condensing means and the first stabilizing plate with the disk interposed therebetween. A slider having an opposing flat surface, which is disposed so as to face the stabilizing plate, and is swingably supported, wherein the first stabilizing plate has a laser beam passing therethrough on an optical path of the laser beam. In this configuration, an opening is provided.

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, and by balancing them, the disk is fixed to the slider and the first stabilizing plate. 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.

Further, by disposing the first stabilizing plate interlocking with the light condensing means between the disk and the light condensing means, the surface on the light condensing means side facing the disk becomes a flat surface. The pressure of the air between the disk and the disk is uniformized.
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, 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-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 the opening is provided in the first stabilizing plate, the range of selection of the material of the first stabilizing plate is expanded, and therefore, the first stabilizing plate is made of a material having good workability and good durability. In addition, since the laser beam is not reflected on the surface of the first stabilizing plate, there is an effect that the power consumption of the recording / reproducing apparatus can be reduced.

In the recording / reproducing apparatus according to the present invention, the opening is provided with the first
The configuration is a mortar-like shape corresponding to the optical path of the laser beam passing through the stabilizing plate.

According to the above configuration, the size of the portion of the opening facing the disk can be reduced without blocking the laser beam passing through the first stabilizing plate. Therefore, it is possible to suppress the turbulence of the air generated in the opening when the disk is rotated, and it is possible to suppress the surface runout of the disk. Thereby, there is an effect that the rotation of the disk can be stabilized.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a structure 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 structure of a main part of the recording / reproducing device shown in FIG.

FIG. 3 is a perspective view of a first stabilizing plate.

FIG. 4 is an enlarged 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. 5 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. 6 is an enlarged cross-sectional view showing a configuration of a main part when the first stabilizing plate is fixed to the optical pickup via a spring in the recording / reproducing apparatus shown in FIG.

FIG. 7 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.

FIG. 8 is a plan view of a second stabilizing plate.

FIG. 9 is a cross-sectional view showing a configuration of a main part when a second 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. 10 is a detailed view of a cartridge.

11 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. 12 is a cross-sectional view showing a configuration of a main part of a conventional recording / reproducing apparatus.

FIG. 13 is a cross-sectional view showing a configuration of a main part of a recording / reproducing apparatus using a conventional cartridge.

[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 first stabilizing plate 5a opening 6 support 7 slider 8 suspension (biasing means) 10 light emission detection optical system (Light source) 11 Laser light 12 Objective lens (Condensing unit) 13 Lens holder 14 Biaxial actuator 40 Magnetic head (magnetic field generating element) 50 Lens (Condensing unit) 51 Lens (Condensing unit) 60 Leaf spring (Elastic member) 70 second stabilizing plate 90 cartridge 95 disk cartridge 96 cartridge 97 disk cartridge

Claims (2)

[Claims] 1. A recording / reproducing system comprising: a light source; focusing means for focusing and irradiating a flexible disk with laser light emitted from the light source; and rotation driving means for rotating the disk. In the apparatus, a first stabilizing plate disposed between the disk and the light condensing means and interlocking with the light condensing means, and disposed to face the first stabilizing plate with the disk interposed therebetween, And a slider having an opposing flat surface that is swingably supported, and the first stabilizing plate has an opening on the optical path of the laser light through which the laser light can pass. A recording / reproducing apparatus characterized by the above-mentioned. 2. The recording / reproducing apparatus according to claim 1, wherein the opening has a mortar shape corresponding to an optical path of the laser beam passing through the first stabilizing plate.