JP2002269802A - Optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk device, by which the satisfactory recording and playing-back operations are carried out by reducing the face wobbling of the optical disk when the flexible optical disk is used. SOLUTION: This optical disk device for recording and playing-back with respect to the flexible optical disk is furnished with a rotation driving means for rotationally driving the optical disk, a converging device for converging the light from a light source on the optical disk and its supporting member, and a rotation stabilizing plate fixed on an indicating member so as to be positioned between these converging device and its supporting member and the optical disk to stabilize the rotating state of the optical disk.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an optical disk device, and more particularly, to an optical disk device capable of recording and reproducing high-density information on a flexible optical disk.

[0002]

2. Description of the Related Art In order to increase the density of an optical disk, it is necessary to reduce the diameter of a light beam spot focused on the optical disk. For this purpose, it is effective to shorten the wavelength of light used for recording and reproduction and to increase the numerical aperture NA of the objective lens. But,
If the wavelength of light is shortened or the numerical aperture NA of the objective lens is increased, the optical disc substrate is tilted to generate a large coma aberration, so that the light beam cannot be accurately focused. In order to compensate for this, the thickness of optical disk substrates has been reduced. For example, in the case of a CD-ROM, the numerical aperture NA of the objective lens is 0.45, the wavelength of light is 780 nm, and the thickness of the substrate is 1.2 mm. Is 0.6, and the thickness of the substrate is 0.6 mm in a DVD-ROM having a light wavelength of 655 nm in order to increase the recording capacity and increase the allowable amount with respect to the tilt of the optical disk substrate. However, when the optical disk substrate is further thinned, the inclination of the substrate due to the surface deflection of the optical disk substrate itself is increased due to a decrease in rigidity, which has an adverse effect. Therefore, there is a limit to shortening the wavelength of light and increasing the numerical aperture NA of the objective lens.

[0003] The wavelength of light is shortened, and the numerical aperture N of the objective lens is reduced.
For the purpose of increasing A, an optical disk recording / reproducing apparatus using a flexible disk substrate as shown in FIG. 9 has been proposed in JP-A-10-308059. This method uses a flexible optical disc 1.
The optical disc 101 is provided with a stabilizing plate 102 for stabilizing the rotation state of the optical disc 101, and a light beam from the optical pickup 103 is condensed and irradiated on the optical disc 101. Wavelength of 650
nm or less, and it is possible to realize recording / reproducing with a recording / reproducing apparatus in which the numerical aperture NA of the objective lens group is 0.7 or more. Further, the above-mentioned publication proposes that the stabilizing plate 102 is formed integrally with the disk cartridge 106 as shown in FIG. In this case, the optical pickup is inserted through an opening of a disc cartridge (not shown).

[0004]

According to the contents described in JP-A-10-308059 shown in FIG. 9, the flexible optical disk 101 fixed to the center hub 104 is rotated by the spindle 105. By being driven, the space between the flexible optical disk 101 and the stabilizing plate 102 is in a reduced pressure state, and the optical disk 101 is attracted to the stabilizing plate 102 and the stabilizing plate 1
02 can be stably rotated while maintaining a constant interval from 02, and good recording and reproduction can be performed by suppressing the surface deflection during rotation of the optical disc 101.

[0005] However, in order to record and reproduce information, an optical pickup 103 including a condensing means (a group of objective lenses) arranged opposite to the stabilizing plate 102 comes close to the flexible optical disk 101. As a result, a pressure fluctuation occurs between the optical pickup 103 and the optical disk 101, and the optical disk 103 is caused to fluctuate around the optical pickup 103 due to the pressure fluctuation, which makes it difficult to perform good recording and reproduction. Becomes In the case of FIG. 10 as well, it is difficult for the optical pickup 103 to perform good recording and reproduction because the optical pickup 103 comes close to the flexible optical disk 101.

[0006]

An optical disk apparatus according to the present invention for solving the above-mentioned problems is as follows. That is, an optical disk device according to the present invention is an optical disk device that records and reproduces data on and from a flexible optical disk, and includes a rotation driving unit that rotationally drives the optical disk, and a condenser that collects light from a light source onto the optical disk. An optical disc device comprising: a support member for the optical disc; a concentrator; a concentrator; a rotation stabilizing plate fixed to the support member so as to be located between the support member and the optical disc;

[0007] In short, the present invention provides a light collecting means, that is, a light collector and a supporting member thereof, which are provided with a rotation stabilizing plate for stabilizing the rotation state of a flexible optical disk. It is possible to prevent the occurrence of surface runout of the optical disk expected when the support member approaches the optical disk, thereby enabling good recording / reproducing (meaning recording / reproducing, recording or reproducing).

According to the present invention, when a rotation stabilizing surface for further stabilizing the rotation state of the optical disk is formed on the inner wall of the optical disk cartridge, the flexible optical disk can be rotated on the support member of the light collector. The air pressure between the optical disk and the rotation stabilizing plate, and the air pressure between the optical disk and the rotation stabilizing surface, sandwiched between the stabilizing plate and the rotation stabilizing surface formed by the inner wall of the optical disk cartridge. The optical disc can be rotated in a state where the balance is balanced, whereby it is possible to suppress the pressure fluctuations generated around the optical pickup, and to suppress the surface runout of the flexible optical disc during rotation, thereby achieving good recording and reproduction. be able to.

Further, in the optical disk device according to the present invention, the rotation stabilizing plate is fixed to the support member of the light collector via a spring, whereby it is possible to suppress a pressure fluctuation occurring around the optical pickup. In addition, since the surface deflection of the flexible optical disk during rotation is suppressed, good recording and reproduction can be realized, and damage to the optical disk due to contact between the flexible optical disk and the rotation stabilizing plate can be prevented. It is possible to completely suppress it.

Further, in the optical disk apparatus according to the present invention, the condenser can be constituted by a two-group lens in which two lenses are combined, and by using the two-group lens to increase the numerical aperture NA, high-density recording can be performed. An optical disk device suitable for reproduction can be provided.

In the present invention, the rotation stabilizing plate can be made of a material capable of substantially transmitting the light condensed by the concentrator, such as transparent quartz or glass, and further condensed by the concentrator. The entire plate is made of a material that does not transmit light, and a light passage hole through which light passes can be formed in the plate. Thus, the rotation stabilizing plate can be formed of an opaque material, and the range of material selection can be widened, and the rotation stabilizing plate can be made to have no laser light reflection surface. Improvement of light use efficiency can be realized.

Further, in an optical disk cartridge for accommodating a flexible optical disk of the optical disk apparatus according to the present invention, a first optical disk cartridge has a first surface for introducing a rotary drive means (specifically, for example, a spindle). An opening and at least a second opening for introducing the light collector can be formed. In this case, the first opening and the second opening are formed only on one surface of the optical disk cartridge, and there is no opening on the other surface of the optical disk cartridge. The slide shutter that can be opened and closed can be formed only on one side of the optical disk cartridge, and the slide shutter of the optical disk cartridge can be simplified.

In the optical disk cartridge, the inner wall of the optical disk cartridge facing the surface on which the second opening is formed is a rotation stabilizing surface, so that the flexible optical disk can be rotated. Between the (transparent stabilizing plate) and the rotation stabilizing surface formed by the inner wall of the optical disk cartridge, which suppresses surface deflection during rotation of the flexible optical disk, and achieves good recording / reproducing. Can be.

In the above optical disk cartridge, if the entire inner wall of one of the optical disk cartridge cases facing the surface where the second opening is formed is a first overall stabilizing surface for a flexible optical disk, A first optical disk formed on the inner wall surface of the optical disk cartridge.
The surface stabilizing plate further suppresses the surface runout of the flexible optical disk during rotational driving, and can realize more stable and favorable recording and reproduction.

Further, in the optical disk cartridge, the entire surface of one inner wall of the optical disk cartridge case facing the surface on which the second opening is formed is a first entire surface stabilizing surface for a flexible optical disk. Further, when the inner wall surface on the side where the second opening is formed is a second overall stabilizing surface for a flexible optical disk, the first stabilizing surface and the second stabilizing surface are provided on the inner wall surface of the optical disk cartridge. By forming the second stabilizing surface, the surface runout of the flexible optical disk during rotational driving is further suppressed, and more stable and good recording / reproducing can be realized.

In the above optical disk cartridge, it is preferable that the distance between the flexible optical disk and the first overall stabilizing surface is not less than 10 μm and not more than 200 μm. It is preferable that the distance from No. 2 to the entire stabilization surface is 10 μm or more and 200 μm or less. In this case, the first stabilizing surface and the second stabilizing surface
The stabilizing surface preferably functions as a stabilizing plate for a flexible optical disc, and furthermore, the deflection of the flexible optical disc during rotational driving is further suppressed, thereby achieving more stable and good recording and reproduction. be able to.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of an optical disk device according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows an optical disk drive 1 according to the present invention.
1 shows a schematic cross-sectional explanatory view of one embodiment. In FIG. 1, a flexible optical disc 1 has a center hub 2 having magnetism, and is chucked to a spindle 3 by magnetic coupling. Then, the optical disc 1 is rotationally driven by rotating the spindle 3. The optical pickup 4 having a transparent stabilizing plate 5 as a rotation stabilizing plate made of glass having a flat and smooth surface is driven in the radial direction of the optical disk by a linear motor or the like.

On the other hand, the flexible optical disk 1 is housed in an optical disk cartridge 6 made of polycarbonate, and the inner wall surface of the optical disk cartridge 6 at a position facing the transparent stabilizing plate 5 has a flat and smooth rotation on the back surface. The opposing stabilizing surface 7 is used as the stabilizing surface. The flexible optical disk 1 is sandwiched between the transparent stabilizing plate 5 and the opposing stabilizing surface 7 of the inner wall surface of the optical disk cartridge 6 and rotated, so that the optical disk 1 and the transparent stabilizing plate 5 And the air pressure between the optical disk 1 and the opposing stabilizing surface 7 is balanced (for example, about 30
00r.pm), and stable rotational drive with little surface runout is realized. That is, since the optical disk 1 has flexibility, the optical disk 1 bends and rotates at a stable position, so that the optical disk 1 is substantially equidistant from the transparent stabilizing plate 5 and the opposing stabilizing surface 7 (for example, , 20μ
m), the disc position in the direction of the optical axis fluctuates less than in the prior art, and focusing becomes easier.

FIG. 2 is a plan view of the optical disk cartridge 6 shown in FIG. 1 as viewed from the optical pickup 4 side. The optical disk cartridge 6 has a first opening 8 for chucking the center hub 2 of the flexible optical disk 1 to the spindle 3 and an optical pickup 4 having a transparent stabilizing plate 5 disposed close to the optical disk 1. And the second opening 9. The optical disc cartridge 6 is provided with a slide shutter 10 that can be opened and closed for the purpose of dust prevention. In the optical disk cartridge of the present invention, an opposing stabilizing surface 7 is formed on the inner wall surface of the optical disk cartridge at a position facing the second opening 9, and the first opening 8 and the second opening 8 are formed on one surface of the optical disk cartridge. By forming both the opening 9 and the slide shutter 10 on only one side of the optical disk cartridge 6, the first opening 8 and the second opening 9 are formed.
Of the slide shutter 10 can be simplified.

FIG. 3 is an enlarged schematic sectional view of the optical pickup 4 shown in FIG. Here, the optical disk 1 may be a ROM disk in which a pit row composed of concave portions is formed on the substrate surface, or a write-once optical disk using an organic dye material as a recording medium. Alternatively, the recording medium may be a rewritable optical disk using a phase change material.
In the case of the write-once and rewritable optical disks, the flexible optical disk 1 is made of a polyethylene terephthalate resin disk substrate 11 having an uneven guide groove formed on the surface.
And a recording medium 12 formed on a surface having uneven guide grooves
And a protective layer 13 for protecting the recording medium 12, and a transparent stabilizing plate 5 fixed to an optical pickup housing 14 as one of support members for an objective lens, which will be described later. Is rotated between the optical disc cartridge 6 and the opposing stabilizing surface 15 formed by the inner wall surface of the optical disc cartridge 6 that opposes the optical disc 5, thereby reducing the air pressure between the optical disc 1 and the transparent stabilizing board 5. In a state where the air pressure between the optical disc 1 and the opposing stabilizing surface 15 is balanced, the flexible optical disc 1 is stably driven to rotate. A laser beam 17 from a light emitting element in a light emission detection optical system 16 is condensed and irradiated onto a recording medium 12 of the optical disc 1 by an objective lens 18 as a condenser, and the state of reflected light from the recording medium 12 is changed. The information is recorded and reproduced by being detected by the light receiving element in the light emission detecting optical system 16. Here, the objective lens 18 is fixed to a lens holder 19 as one of its support members,
The lens holder 19 is fixed to the optical pickup housing 14 via a biaxial actuator 20 as another supporting member, so that the objective lens 18 is fixed.
Are driven for focusing and tracking with respect to the uneven guide grooves of the optical disk 1. The flexible optical disk 1 is stably rotated between the transparent stabilizing plate 5 and the opposing stabilizing surface 15 to suppress surface runout. Even if the axis actuator 20 is used, focusing and tracking are realized, and recording and reproduction of information signals can be sufficiently performed.

Next, FIG. 4 shows a method for increasing the numerical aperture NA of an objective lens, which is disclosed in Japanese Patent Laid-Open No. 10-30805.
FIG. 9 is an enlarged schematic cross-sectional view of a portion of the optical pickup 4 when a two-group lens in which two lenses 21 and 22 are combined is used, similarly to the content proposed in Japanese Patent Application Laid-Open No. 9-29.

Here, the two-group lens is a lens that can increase the numerical aperture NA by combining the two lenses 21 and 22. In particular,
The numerical aperture NA of the second group lens is preferably 0.7 or more, and more preferably about 0.8 to 0.95. Although it is possible to increase the numerical aperture by using a single lens, manufacturing is facilitated by using a two-group lens. When the numerical aperture NA is set to 0.7 or more as in this embodiment, it is preferable to use a two-group lens.

According to the contents described in Japanese Patent Application Laid-Open No. 10-308059, light-collecting means (objective lens group) arranged opposite to the stabilizing plate 102 for recording and reproducing information.
Is brought close to the flexible optical disk 101. In this case, the surface of the optical pickup 103 facing the optical disk 101 is a surface having a light condensing means such as a lens element and a surface having relatively large irregularities.
01, the pressure fluctuation occurs between the optical pickup 103 and the optical disk 101, and the optical disk 103 flaps due to the pressure fluctuation around the optical pickup 103, so that a stable focusing operation can be maintained. However, according to the present embodiment, the air pressure between the optical disc 1 and the transparent stabilizing plate 5 and the air pressure between the optical disc 1 and the opposing stabilizing surface 15 are difficult. When the optical disc 1 is driven to rotate stably in a state where the air pressure is balanced, a stable focusing operation can be maintained, and good recording and reproduction can be performed.

As the recording medium 12 in FIG. 4, a write-once optical disk using an organic dye material or a rewritable optical disk using a phase change material can be used. Alternatively, a ROM disk in which a pit row composed of concave portions is formed on the substrate surface may be used. Next, FIG.
3 is an enlarged schematic cross-sectional view when the transparent stabilizing plate 5 is fixed to the optical pickup housing 14 via the leaf spring 23 in the configuration shown in FIG.

In the configuration shown in FIG. 2, since the transparent stabilizing plate 5 is directly fixed to the optical pickup housing 14, when the optical disk cartridge 6 and the optical disk 1 vibrate due to external vibrations, the optical disk 1 becomes transparent. Collision with the stabilizing plate 5 causes damage such as a scratch on the surface of the optical disc 1. On the other hand, in the configuration shown in FIG. 5, since the transparent stabilizing plate 5 is fixed to the optical pickup housing 14 via the leaf spring 23, the optical disc cartridge 6 and the optical disc 1 are vibrated by external vibration. Also in this case, since the leaf spring 23 functions to absorb the vibration of the optical disc 1, it is possible to suppress the damage of the optical disc 1 due to the collision between the optical disc 1 and the transparent stabilizing plate 5 due to the external vibration. Here, the case where the leaf spring 23 is used for the configuration shown in FIG. 2 is shown. However, the transparent stabilizing plate 5 may be attached to the leaf spring 23 even in the configuration using the second group lens as shown in FIG. A similar effect can be obtained by fixing the optical pickup to the optical pickup housing 14 via

Next, FIG. 6 shows the configuration shown in FIG.
FIG. 3 is an enlarged schematic cross-sectional view when a light passage hole 24 is formed in a light passage portion of the stabilizing plate 5. In the configuration shown in FIGS. 3, 4 and 5, it is necessary that the laser beam 17 passes through the transparent stabilizing plate 5, and the material is optically homogeneous and transparent quartz or glass is used. It will be limited.
Further, there is a problem that light is reflected on both surfaces of the transparent stabilizing plate, and the utilization efficiency of the laser beam 17 is reduced.
On the other hand, as shown in FIG.
By forming 4, the stabilizing plate 5 can be formed of an opaque material, and the range of material selection can be expanded. For example, it is possible to form the stabilizing plate 5 with an inexpensive material such as opaque reinforced plastic. Further, since the stabilizing plate 5 has no reflection surface of the laser beam 17, the utilization efficiency of the laser beam 17 can be improved.

Next, FIG. 7 shows a surface on which the opposing stabilizing surface 7 of the optical disk cartridge 6 is formed, for the purpose of further stabilizing the rotational drive of the flexible optical disk 1, that is, FIG. , The entire inner wall surface of the optical disk cartridge 6 facing the surface where the opening is formed is used as the first overall stabilizing surface 25. By arranging the flexible optical disk 1 and the first overall stabilizing surface 25 of the optical disk cartridge 6 close to each other, it is possible to further stabilize the rotational drive of the optical disk 1.

In the configuration shown in FIG. 1, the flexible optical disk 1 is rotated by being sandwiched between the transparent stabilizing plate 5 and the opposing stabilizing surface 7 on the inner wall surface of the optical disk cartridge 6. It rotates in a state where the air pressure between the optical disc 1 and the transparent stabilizing plate 5 and the air pressure between the optical disc 1 and the opposing stabilizing surface 7 are balanced, thereby realizing a stable rotational drive with little surface runout. In a portion not sandwiched between the transparent stabilizing plate 5 and the opposing stabilizing surface 7, the optical disk 1 rotates with a certain degree of freedom in the cartridge. Therefore, it is conceivable that the flexible optical disk 1 may be slightly fluttered in the space in the optical cartridge case 6 or may be prevented from rotating stably due to the influence of external vibration or the like.

On the other hand, in the configuration shown in FIG. 7, the flexible optical disk 1 is rotated by the spindle 3 so that the flexible optical disk 1 and the first overall stabilizing surface are formed. The space sandwiched between the optical disks 1 is in a reduced pressure state, and the optical disk 1 is moved to the first overall stabilizing surface 25.
, And can rotate stably while maintaining a constant distance from the first overall stabilizing surface 25. Accordingly, even in a portion where the flexible optical disk 1 is not sandwiched between the transparent stabilizing plate 5 and the opposing stabilizing surface 7,
Suppression of surface deflection during rotation of the optical disc 1 enables better recording and reproduction.

Here, the thickness of the flexible optical disk 1 can be applied to other embodiments,
It is desirable that the thickness be 30 μm or more and 400 μm or less. When the thickness of the optical disc 1 is thinner than 30 μm, it becomes difficult to maintain the strength of the optical disc 1 to withstand rotation.
When the thickness of the optical disk 1 is greater than 400 μm, the flexibility of the optical disk 1 becomes weak, and the transparent stabilizing plate 5, the opposing stabilizing surface 7, and the first overall stabilizing surface 25 suppress the runout of the optical disk 1 during rotation. The effect is reduced. Also,
In order for the inner wall of the optical disk cartridge case 6 to function as the first overall stabilizing surface 25, the distance between the optical disk 1 and the first overall stabilizing surface 25 must be at least 10 μm.
It is desirable that the thickness be not more than 00 μm. When the distance between the optical disk 1 and the first overall stabilizing surface 25 is smaller than 10 μm, the optical disk 1 collides with the first overall stabilizing surface 25, and the possibility that the surface of the optical disk 1 is damaged is increased. . When the distance between the optical disc 1 and the first overall stabilizing surface 25 is larger than 200 μm, the first
Of the optical disc 1 in the optical disc cartridge case 6 may become unstable due to vibration or the like.

Next, FIG. 8 shows a surface on which the opposing stabilizing surface 7 of the optical disk cartridge 6 is formed, for the purpose of further stabilizing the rotational drive of the flexible optical disk 1, that is, FIG. In FIG. 8, the entire inner wall surface of the optical disk cartridge 6 facing the surface where the opening is formed is a first overall stabilizing surface 25, and the entire inner wall surface of the optical disk cartridge 6 where the opening is formed is the first surface. 2 is a configuration in which the entire surface is a stabilizing surface 26. In this manner, by arranging the flexible optical disk 1 with the first overall stabilizing surface 25 and the second overall stabilizing surface 26 of the optical disk cartridge 6 close to each other, the rotational drive of the optical disk 1 is further stabilized. Can be realized.

In the configuration shown in FIG. 7, the rotational drive of the optical disk 1 is stabilized by disposing the flexible optical disk 1 close to the first stabilizing surface 25. In a portion not sandwiched between the stabilizing plate 5 and the opposing stabilizing surface 7, the optical disk 1 rotates with a degree of freedom in a direction away from the first stabilizing surface 25 in the cartridge. Therefore, the flexible optical disk 1 is affected by external vibrations or the like, causing surface deflection in the space inside the optical cartridge case 6, and hindering stable rotational driving.

On the other hand, in the configuration shown in FIG. 8, the flexible optical disk 1 is driven to rotate by the spindle 3, so that the flexible optical disk 1 is stabilized for the first time. Surface 25 and second stabilizing surface 26
, The air pressure between the optical disk 1 and the first overall stabilizing surface 25 and the air pressure between the optical disk 1 and the second overall stabilizing surface are balanced. It rotates and realizes stable rotation drive with little surface runout. Accordingly, even in a portion where the flexible optical disk 1 is not sandwiched between the transparent stabilizing plate 5 and the opposing stabilizing surface 7, the surface deflection during rotation of the optical disk 1 is suppressed, so that better. Recording and reproduction are performed.

Here, it is desirable that the thickness of the flexible optical disk 1 is not less than 30 μm and not more than 400 μm. When the thickness of the optical disc 1 is thinner than 30 μm, it is difficult to maintain the strength of the optical disc 1 to withstand rotation. When the thickness of the optical disc 1 is thicker than 400 μm, the flexibility of the optical disc 1 becomes weak, and the transparent stabilizing plate 5, the opposing stabilizing surface 7, the first entire stabilizing surface 25, and the second entire stabilizing surface 26 reduce the effect of suppressing the surface runout during rotation of the optical disc 1. Further, the inner wall of the optical disk cartridge case 6 is connected to the first overall stabilizing surface 25 and the second
In order to function as a stabilizing surface of the optical disk, the distance between the optical disk 1 and the first overall stabilizing surface 25 and the distance between the optical disk 1 and the second overall stabilizing surface 26 must be 1
It is desirable that the thickness be 0 μm or more and 200 μm or less. The distance between the optical disk 1 and the first overall stabilizing surface 25 and the distance between the optical disk 1 and the second overall stabilizing surface 26 are 1
If the thickness is smaller than 0 μm, the optical disk 1 collides with the first overall stabilizing surface 25 or the second stabilizing surface 26, and the possibility that the surface of the optical disk 1 is scratched increases. Also,
When the distance between the optical disk 1 and the first overall stabilizing surface 25 and the distance between the optical disk 1 and the second overall stabilizing surface 26 are larger than 200 μm, the first overall stabilizing surface 2
5 and the second stabilizing surface 26 cannot function as a stabilizing plate, and the optical disk cartridge case 6
There is a possibility that the rotation of the optical disk 1 in the interior becomes unstable.

[0036]

According to the optical disk apparatus of the present invention, by providing a rotation stabilizing plate for stabilizing the rotation state of the optical disk on the support member of the light collector, the light collector and the support member can be mounted on the optical disk. To prevent the occurrence of surface runout of the optical disk expected when approaching the optical disk, thereby enabling good recording and reproduction. The present invention further provides a rotation stabilizing surface formed on the inner wall of the optical disk cartridge for further stabilizing the rotation state of the optical disk. Between the optical pickup and the optical pickup, when the optical disc rotates while the air pressure between the optical disc and the rotation stabilizing plate balances the air pressure between the optical disc and the opposing stabilizing surface. This makes it possible to suppress pressure fluctuations that occur, suppresses surface deflection during rotation of a flexible optical disc, and achieves good recording and reproduction.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional explanatory view showing one embodiment of an optical disk device of the present invention.

FIG. 2 is a plan view of the optical disk cartridge of FIG.

FIG. 3 is a partially enlarged sectional view of the optical disc device of FIG. 1;

FIG. 4 is a partially enlarged cross-sectional view showing another embodiment of the optical disk device of the present invention.

FIG. 5 is a partially enlarged sectional view showing still another embodiment of the optical disk device of the present invention.

FIG. 6 is a partially enlarged cross-sectional view showing still another embodiment of the optical disk device of the present invention.

FIG. 7 is a cross-sectional view showing still another embodiment of the optical disk device of the present invention.

FIG. 8 is a sectional view showing still another embodiment of the optical disc device of the present invention.

FIG. 9 is a sectional view of a conventional optical disk device.

FIG. 10 is a sectional view of a conventional optical disk device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Flexible optical disk 5 Transparent stabilizing plate 6 Optical disk cartridge 7 Opposing stabilizing surface 8 First opening 9 Second opening 10 Slide shutter 11 Optical disk substrate 12 Recording medium 13 Protective film 15 Opposing stabilizing surface 18 Condensing lens 21, 22 Second group lens 23 Leaf spring 24 Light passage hole 25 First overall stabilizing surface 26 Second overall stabilizing surface

Claims (10)

[Claims] 1. An optical disk device for recording and reproducing information on and from an optical disk having flexibility, a rotation driving means for driving the optical disk to rotate, a light collector for condensing light from a light source onto the optical disk, and a support member therefor An optical disc device comprising: a light collector; a rotation stabilizing plate fixed to a support member so as to be located between the support member and the optical disc; and a rotation stabilizing plate for stabilizing a rotation state of the optical disc. 2. An optical disk is housed in an optical disk cartridge, and the cartridge faces the inner wall of the optical disk opposite to the rotation stabilizing plate with respect to the optical disk, and further stabilizes the rotation state of the optical disk. The optical disk device according to claim 1, wherein the optical disk device has a surface. 3. The optical disk device according to claim 1, wherein the rotation stabilizing plate is fixed to a support member of the light collector via a spring. 4. The optical disk device according to claim 1, wherein the rotation stabilizing plate is made of a material that can substantially transmit light collected by the light collector. 5. The rotation stabilizing plate according to claim 1, wherein the rotation stabilizing plate is made of a material that does not transmit the light condensed by the light collector, and has a light passage hole through which the light passes. An optical disk device according to any one of the above. 6. An optical disk cartridge having a first opening for introducing a rotary drive means therein and a second opening for introducing at least a light collector. 6. The optical disk device according to any one of 2 to 5. 7. An optical disk cartridge having a first overall stabilizing surface for an optical disk on an entire inner wall opposed to a surface on which a second opening is formed.
An optical disk device according to claim 1. 8. The optical disk cartridge has a first overall stabilizing surface for an optical disk formed on the entire inner wall opposite to the surface on which the second opening is formed, and the second opening is formed. 8. The optical disk device according to claim 7, wherein a second overall stabilization surface for the optical disk is formed on the entire inner wall on the side of the optical disk. 9. The optical disk device according to claim 8, wherein a distance between the optical disk and the first overall stabilizing surface is not less than 10 μm and not more than 200 μm. 10. The optical disk device according to claim 9, wherein a distance between the optical disk and the second overall stabilizing surface is not less than 10 μm and not more than 200 μm.