JPH11306710A - Optical disk cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent a dust from entering a gap between an optical disk and a solid immersion lens(SIL) by providing a recording and reproducing apparatus using a high-density optical disk with a window through which light of a writing and readout light source wavelength is to pass at a position lower than the upper surface of the apparatus toward the optical disk so as to dispose this window close to a surface of the optical disk. SOLUTION: An optical disk cartridge 12 is provided with a window 13 which is transparent with respect to a wavelength of a recording and readout light source, thereby resulting in a structure in which a surface of an optical disk 11 does not expose to the outside. The window 13 is provided at a position lower than the upper surface of the optical disk cartridge 12 toward the optical disk 11, so that the lower surface of the window 13 becomes very close to the upper surface of the optical disk 11. At the time of recording and reproduction, an SIL 31 is disposed at the nearest distance from the window 13, and the window 13 is in turn disposed at the nearest distance from the optical disk 11. Adhesion of a dust onto the surface of the optical disk 11 is prevented when a recording medium is changed, and high-density recording and reproduction by an optical disk apparatus employing the SIL 31 can be surely performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cartridge for a recording / reproducing apparatus using a high-density optical disk such as a magneto-optical disk, a CD, and a DVD, and more particularly to an optical disk cartridge for an optical disk apparatus using a solid immersion lens.
This is effective for preventing dust from entering the gap between the optical disk and the solid immersion lens.

[0002]

2. Description of the Related Art In a recording / reproducing apparatus using an optical disk, a recording / reproducing apparatus using an optical system using a solid immersion lens has been proposed as one of measures for improving the recording density (Japanese Patent Laid-Open Publication No. HEI 9 (1994) -197686). 8-212
579). The outline of this is as follows (see FIG. 6). The objective lens 61 is held by a holder 64, and is vertically driven and controlled by a focus actuator 65, and is driven and controlled in a radial direction of the optical disk by a tracking actuator 66. A solid immersion lens (SIL, hereinafter referred to as “SIL”) 63 is interposed between the optical disk 60 and the objective lens 61.
63 is held by the holder 67 and the SIL actuator 6
8 controls the drive in the optical axis direction. The gap between the SIL 63 and the optical disk 60 is controlled in a very small range of several tens to several hundreds of nm. The light converged by the objective lens 61 is applied to the optical disk 60 via the plate 62 and the SIL 63. Focus control and tracking control of a holder 64 holding an objective lens 61 and a plate 62 are performed by a focus actuator 65 and a tracking actuator 66, respectively. In addition, the SIL actuator 68 is driven in response to a change in the capacitance of the capacitor formed between the holder 64 and the holder 67, and is controlled so that the gap between the holder 67 and the holder 64 is constant. This suppresses the occurrence of spherical aberration due to the thickness of the SIL 63 and the optical disc 60. In addition, as a recording / reproducing apparatus using an SIL, an objective lens and the SIL are integrally formed, these are mounted on a flying head, and the distance between the flying head and the optical disk is increased by a flying height (high speed due to being pulled by the optical disk. There has also been proposed an optical disk which is controlled by a floating amount of a floating head caused by a floating force of an air layer on the surface of the rotating optical disk (see the above-mentioned publication). These SILs
As described above, in the recording / reproducing apparatus using the optical system using the SIL, it is necessary to arrange the SIL at a position away from the optical disk by several tens to several hundreds of nm, and even when the above-described high-precision actuator is used, ,Also,
Even when the above-mentioned flying head is used, the distance between the SIL and the recording surface of the optical disk is very small, so that the head is easily affected by dust. Therefore, it is difficult to use a removable disk (replaceable disk) into which dust easily enters. Was.

On the other hand, as a method of preventing dust from adhering to the surface of an optical disk, an optical disk is placed in a substantially completely sealed cartridge, and writing and reading are performed through a transparent window attached to the cartridge. ,
JP-A-5-282827, JP-A-5-22577
However, in the recording / reproducing apparatus using the optical system using the SIL, the interval between the SlL and the optical disk needs to be extremely close as described above. The cartridge cannot simply be used. For this reason, in order to completely seal an optical disk in a cartridge in an optical disk device using the SIL, it is necessary to devise a mechanism structure of a window so that an interval between the SIL and the optical disk can be made close to each other. is necessary.

[0004]

[Problems to be solved by the present invention]
Regarding an optical disk device using IL, an optical disk and S
To ensure that dust can be prevented from entering the IL,
An object of the present invention is to devise a mechanism structure of a window of an optical disk cartridge and to configure an optical disk device that can be exchanged at a high density using the cartridge.

[0005]

Means taken to solve the problem: An optical disk cartridge for an optical disk device using SIL is written and read.
A window for transmitting light of a reading light source wavelength is provided, and the window is lowered from the upper surface of the optical disk cartridge to the optical disk to bring the window and the optical disk surface close to each other.

[0006]

The position of the transparent window for transmitting light of the wavelength of the light source for recording / reproducing on the cartridge having the built-in optical disk is lowered from the upper surface of the cartridge to the optical disk side and is brought close to the surface of the optical disk. The gap between the upper surface is made as small as possible,
By bringing L close to the window and functioning as a part of the SIL, the upper surface of the optical disc and the SIL can be made as close as possible. Further, since the cartridge can always be kept in a sealed state, dust is prevented from adhering to the surface of the optical disk and being interposed between the optical disk and the SIL. Further, in this configuration, the entire surface of the optical disk side of the cartridge is not in close proximity to the optical disk. Therefore, it is not necessary to increase the processing accuracy of the cartridge so much, and it is sufficient to manufacture the optical disk only with an accuracy that allows only the window to approach the optical disk. Further, since the adjacent surface is small, the resistance due to air entering the gap between the disc and the cartridge is small, and therefore, the disc can be easily rotated at high speed.

[0007]

Embodiment

Embodiment 1 In the above solution, the position of the window can be adjusted in the direction perpendicular to the surface of the optical disk so that the distance between the optical disk and the window can be adjusted.

Since the distance between the optical disk and the window can be adjusted, the error in the distance between the optical disk and the window due to the manufacturing error of the cartridge can be compensated, thereby enabling higher density recording and reproduction. become.

[0008]

Second Embodiment In the optical disk cartridge according to the first embodiment (claim 2), when the optical disk cartridge is not used, the window comes into contact with a mounting hole formed in the cartridge to seal the cartridge. Approaching the optical disk at a distance smaller than the size of the dust generated in the optical disk.

With the window movable vertically with respect to the optical disk, the structure of the cartridge can be simplified.

[0009]

Embodiment 3 In the optical disk cartridge according to Embodiment 2 (claim 3), a non-volatile liquid such as silicone oil is sandwiched between the window and the hole of the cartridge so that even when the window is close to the optical disk. The non-volatile liquid forms a film between the window and the cartridge due to surface tension to prevent dust from entering.

Since the intrusion of dust can be avoided by the liquid film, the movable range of the window can be increased as compared with the cartridge of the third embodiment.

[0010]

[Embodiment 4] The SIL is formed integrally with the window in the above solution.

By forming the SIL integrally with the window,
Since the window itself can function as the SIL, the gap between the optical disc and the SIL can be further reduced. Further, since it is not necessary to incorporate the SIL into the optical pickup head of the recording / reproducing apparatus, it is easy to manufacture the optical head, and the optical head (DVD, CD) of another specification can be made compatible.

[0011]

Fifth Embodiment In the optical disk cartridge according to the fourth embodiment (claim 5), the shape of the SIL integrated with the window is a cylindrical lens extending in the radial direction of the optical disk.

By making the shape of the SIL integrated with the window cylindrical, the means for moving the position of the window in the radial direction can be omitted, so that the structure of the cartridge in which the window and the SIL are integrated is reduced. Can be easy.

[0012]

[Sixth Embodiment] In the optical disk cartridge according to the first and fifth embodiments, a coil capable of generating a magnetic field in a direction perpendicular to the optical disk is integrally formed in the window.

Since the coil is integrated with the window, high-density recording and reproduction can be performed on the magneto-optical disk. Further, since it is not necessary to incorporate a coil in the optical head portion of the recording / reproducing apparatus, it is possible to provide compatibility between the magneto-optical disk and the phase change optical disk with one optical head.

[0013]

[Seventh Embodiment] In the optical disk cartridge according to the seventh aspect, the surface of the window on the optical disk side is divided into a plurality of surfaces by grooves.

In the structure in which the window floats above the optical disk by utilizing the airflow flowing between the window and the optical disk, the airflow between the window and the optical disk can be controlled, whereby the distance between the window and the optical disk can be minutely controlled. can do.

[0014]

[Eighth Embodiment] In the optical disk cartridge according to the eighth and seventh embodiments, any one of elastic materials such as a spring, a sponge, and a viscous fluid, or a combination thereof is used as the window fixing means.

[Function] Even if the writing / reading position changes up and down while the optical disc is rotating due to bending of the optical disc and manufacturing errors, the height of the window automatically changes following the change. You can make it.

[0015]

[Embodiment 9] Solution 1, Embodiment 1 to Embodiment 8
The optical disk cartridge according to the above, wherein the cross section of the window in the radial direction of the optical disk is convex with respect to the optical disk side.

[Advantage] Even if the optical disk has a warp in the radial direction (the optical disk is warped in a mortar shape) and the distance between the window and the optical disk is partially wide in a flat window, the angle of the window is adjusted. This allows the window to approach any location on the optical disc.

[0016]

[Embodiment 10] In the optical disk cartridge according to Solution 1, Embodiments 1 to 9, the portion where light is focused on the surface of the window on the optical disk side is higher than other portions.

[Function] Since the area close to the optical disk is reduced, it is easy to bring the window and the optical disk close to each other.

[0017]

An eleventh aspect of the present invention provides the optical disk cartridge, wherein a mechanism for fixing the optical disk when not in use is provided at a position farther from the window than when in use.

Although the lower surface of the window is close to the upper surface of the optical disk, it is possible to prevent the optical disk from coming into contact with the window due to vibration and shock during storage, and safe storage can be performed.

[0018]

[Twelfth Embodiment] The optical disk cartridge according to the above means has a shutter for covering the window when not in use.

The dust can be prevented from adhering to the window when not in use.

[0019]

[Embodiment 13] Solution means, Embodiments 1 to 1
2. A phase-change type optical recording / reproducing apparatus is constituted by using the optical disk cartridge according to No. 2.

In a convertible phase change type recording / reproducing apparatus, S
Since the IL can be used, it is possible to manufacture a recording device with higher density.

[0020]

[Embodiment 14] Solution means, Embodiments 1 to 1
2. A magneto-optical recording / reproducing apparatus is configured using the optical disc cartridge according to No. 2.

In an exchangeable magneto-optical recording / reproducing apparatus, the SI
Since L can be used, it is possible to manufacture a recording / reproducing apparatus with higher density.

[0021]

Next, an embodiment will be described with reference to the drawings.

FIG. 1 is a plan view of an optical disk cartridge according to the present invention, and FIG. 2 is a cross-sectional view taken along a dotted line in FIG. 1 during operation. The optical disk 11 is a cartridge 12
It is stored in. Since a window 13 that is transparent to light having the wavelength of the recording / reproducing light source is attached to the cartridge 12 by the fixing means 15, the optical disc 11 has a structure in which the surface of the optical disc 11 is not exposed to the outside world. The window 13 is provided at a position lowered from the upper surface of the cartridge 12 toward the optical disk 11 via the fixing means 15, so that the lower surface of the window is extremely close to the upper surface of the optical disk 11. At the time of recording / reproducing, the cartridge 12 is inserted into the recording / reproducing apparatus, the optical disk 11 is connected to a motor so as to be driven via the hub 14, and a laser beam for recording / reproducing is transmitted through the window 13 to the optical disk 11. Irradiated on the recording / reproducing surface.
FIG. 3 shows the arrangement of the optical disk and the optical system during recording and reproduction. The light from the light source is the objective lens 32, SIL3
1. The optical disk is irradiated through the window 13. At this time, the SLL 31 and the window 13, and the window 13 and the optical disk 11 are brought close to each other. Objective lens 32,
The SIL 31 and the window 13 are designed such that the focal point is formed on the surface of the window 13 on the optical disk side. The SLL 31 and the objective lens 32 perform recording and reproduction on the optical disk while moving on the window 13 in the radial direction of the optical disk. in this case,
It is important that the light emitted from the SIL 31 to enter the window 13 and enter the window 13 is introduced into the window 13 without being reflected between the SIL and the window. NA after passing through SlL31
Since the (numerical aperture) is large, when the air layer between the SIL 31 and the window 13 is thick, especially when the NA exceeds 1, a part of the light that escapes from the SlL 31 into the air is totally reflected. However, it is necessary to reduce the distance between them so that they can be handled as a near field. However, SIL 31 and window 13
Since there is no high-speed relative movement between the window 13 and the optical disk 11, it is not so difficult to precisely control the height. In some cases, the SIL 31 may be kept in contact with the window 13. In addition, materials such as paraffin oil (refractive index: 1.48), seda oil (refractive index: 1.52), and silicon oil, which have a refractive index closer to the SIL or window than air, are used for liquid immersion method for microscopic observation. Window 1
Since there is no need to worry about the near field between the optical disk 3 and the optical disk, it is easy to control the interval between the SIL and the window.
It is important that the distance between the window 13 and the optical disk 11 be close to such a distance that the spot diameter reduced by the SIL 31 does not spread. For this purpose, for example, when the cartridge 12 is loaded into the recording / reproducing apparatus, one of the height at which the cartridge 12 is fixed to the recording / reproducing apparatus and the position at which the optical disk 11 is fixed to the motor, or both of them, are set to piezoelectric. Control may be performed using a precise actuator using an element or the like, and adjustment may be performed so as to achieve the above-described interval. With the above configuration, the surface of the optical disk 11 is not exposed to the outside world, and therefore the optical disk 1 is not exposed.
It is possible to prevent dust from adhering to the surface of the optical disk at the time of replacement of the optical disk 1, and to prevent dust from entering between the optical disk 11 and the SIL 31.

Although the first embodiment has been described above, recording / reproducing is performed on the optical disk 11 by setting the fixing means 15 of the window 13 so that the window 13 can move in the direction of the optical disk (the direction perpendicular to the surface of the optical disk). At times, they may be brought close to each other. At this time, if a vibration damping mechanism using a spring, a sponge, a viscous fluid, or the like is incorporated in the fixing means 15, even if the disk surface vibrates due to the distortion during the rotation of the optical disk, a minute space is formed between the window and the optical disk surface. Since the gap can be maintained, the optical disk and the window can be brought close to each other without any trouble. 8 (a) and 8 (b) show an example thereof (FIG. 8 (b) is a cross-sectional view taken along a line AB in FIG. 8 (a)). In FIG. 8B, the window 13 is supported by a leaf spring 81, and a damper 82 is attached to the leaf spring 81 so that vibrations during rotation of the optical disk can be absorbed. The gap between the window and the cartridge is closed with a thin film 83. In order to keep the distance between the optical disk and the window close to a certain height, the levitation force of the air entrained between the optical disk and the window can be used by rotating the optical disk. As applied to hard disk magnetic heads, the height of the window is adjusted by adjusting the inflow of air by tilting the window to some extent or by making grooves on the optical disk side that are parallel to the rotation direction of the disk. Can be controlled. Also, as shown in FIG. 9, if the window is not completely flat, but the side facing the optical disk is made slightly convex (see the cross-sectional shape of the window 91 in FIGS. 9 (a) and 9 (b)). Even if the optical disk is warped in the radial direction (the optical disk warps in a mortar shape), the recording / reproducing operation can be performed at any position by tilting the window in the radial direction (regardless of the reproducing position). The window can be brought close to the playback position. In FIG. 9, the window 91 is attached to the cartridge by holding means 92 such as a plate spring which is independent on the center side and the peripheral side of the disk. SIL3 for recording or playback
1 pushes down the window 91 to approach the optical disk. At this time, by utilizing the fact that a large force acts on the holding means 92 on the side close to the SIL and adjusting the shape of the window and the strength of the spring of the holding means 92, the part pressed by the SIL is most likely to be on the optical disc. Can be approached. Further, as shown in FIG. 10, if a portion where light is focused on the surface of the window 13 on the optical disk side is formed to be more convex than other portions, there is a case where there is distortion in the rotation direction of the optical disk surface ( Even in the case of waving in the circumferential direction), the window and the optical disk can be kept close to each other. The size of the protrusion may be determined in consideration of the magnitude of the distortion of the optical disk and its period so that the distance between the window and the optical disk can be sufficiently reduced at any position. FIG. 10 illustrates the window 13 in FIG. 2 and the window 101 according to this embodiment side by side for comparison, and a streak-like projection 101a is protruded from the back surface of the window 101 according to this embodiment. doing. Furthermore, in order to prevent damage to the window when not in use and adhesion of dust to the window, a shutter that covers the window when not in use is provided. Fixing the cartridge away from the window is also effective for safe storage of the cartridge.

[0023]

[Second Embodiment] In a second embodiment, the window 13 itself has an SlL function. The plane shape of the window in this case is shown in FIG.
As shown in (a), the window 41 has the SIL 31
Is fitted. The shape of the window is not limited to that shown in FIG. 4A, and the window 41 and the SIL 31 may be integrally formed of the same material. FIG. 4B is a cross-sectional view of a state in which the window with the SIL is attached to the cartridge.
The window 41 is attached to the cartridge via a moving unit 42 for moving the window in the radial direction of the optical disc 11. The moving means 42 may be incorporated in the cartridge. As another example, a connecting portion for transmitting the moving force to the window may be provided in the cartridge, and the moving force may be transmitted from the outside to the window. FIGS. 5A and 5B show two examples in which the moving means 42 is incorporated in a cassette. The moving means 51 in FIG. 5A moves the window 41 back and forth in the radial direction of the optical disk. The moving means 52 in FIG. 5B rotates the window 41 about the moving means 52 to move the window 41 in the radial direction of the optical disk 11. In this example,
In order to make the size of the rectangular cartridge 12 compact, moving means 51 and 52 are arranged at the corners of the cartridge. Various mechanisms can be used for the window moving means. For example, a mechanism using a guide for guiding the window in the radial direction of the optical disk and a linear motor for moving the window along the guide (specifically, The mechanism is, for example,
Japanese Patent Application Laid-Open No. 5-67382) can also be employed. FIG. 7 shows a case where the shape of the SIL is a cylindrical lens. The SIL 71 is arranged so as to cross the writing area of the optical disk. In this case, since it is not necessary to move the window 41 in the radial direction of the optical disc 11 for the SIL, the structure of the cartridge can be simplified as compared with the above-described example. When an SIL having such a shape is used in combination with an objective lens that can obtain a normal circular spot, reference numeral 7 in FIG.
As shown by 5, the spot becomes elliptical. However,
In the rotation direction of the disk, the size is smaller than that in the case where there is no SIL, that is, as compared with the case indicated by reference numeral 73, so that the recording bit length can be shortened and the recording density can be increased. If a coil for generating a magnetic field is integrated with the window, the cartridge can be used for a magneto-optical disk. This is shown in FIG. The write magnetic field generating coil 121 is attached to the surface of the SIL 31 on the optical disk side. The other points in this example are the same as those shown in FIG. When the window as described above is used, it is not necessary to incorporate the SIL 31 into the optical pickup head, so that the pickup head can be easily manufactured.
By sharing the objective lens, other optical discs (DV
D, CD).

In the third embodiment, the window can be moved in the direction of the optical disk so that the influence of the warpage of the disk can be reduced. In addition, in order to simplify the structure of the cartridge, the distance between the window and the cartridge during use is reduced. The gap is made to have. The structure of the third embodiment is shown in FIG.
The operating states are shown in FIGS. 11 (b), (c), (d) and (e). In the storage state shown in FIG.
Is fixed at a position away from the window 101 by a fixing mechanism 111. The window 101 is pressed against the opening of the cartridge by the leaf spring 112 and the leaf spring fixing means 114 to seal the cartridge. When this cartridge is mounted on the recording / reproducing apparatus, as shown in FIG. 11B, the fixing mechanism 111 releases the fixing of the optical disk, the optical disk is lifted by the shaft 113 of the motor for driving the optical disk, and the leaf spring fixing means is used. 114 moves to the window 10
1 approaches (or contacts) the optical disk 11. SIL
The recording and reproduction 31 and the objective lens 32 are performed in the vicinity of the window. At this time, a gap is formed between the cartridge and the window, but dust can be prevented from entering by sufficiently reducing the size of the gap between the window and the cartridge. For example, if the size of dust generated in the recording / reproducing apparatus is about 50 μm,
If the size of the gap is made smaller and the overlap width is made sufficient, dust can be prevented from entering. FIG.
If a non-volatile and viscous liquid 116 such as silicon is interposed between the window 101 and the cartridge 12 as shown in FIG. 3C, even if the window moves, the liquid 116 moves by surface tension to close the gap. You can do so. FIG.
In the case shown in (c), a projection is provided on the cartridge side,
The liquid 116 remaining in the gap when the window 101 is in close contact with the cartridge 12 gathers around the protrusion when the window 101 moves, thereby sealing the inside of the cartridge (FIG. 11E). reference). With the above configuration, the structure of the cartridge in which the height of the window can be adjusted while being substantially closed can be simplified.

[0025]

[Effect] 1. Overall Effects The solution means and various embodiments and examples have been described in detail. The overall effects of the present invention are as follows. Optical disc cartridges using SIL
By providing a window through which light of the wavelength of the writing / reading light source is transmitted, and lowering the window from the upper surface of the optical disk cartridge toward the optical disk so that the window and the optical disk surface are close to each other, dust is generated on the optical disk surface when the recording medium is replaced. Adherence can be prevented. Therefore, high-density recording and reproduction by the optical disk device using the SIL can be reliably performed, and the exchange of the recording medium can be performed without any trouble. In addition, the position of the window is set in the direction of the optical disk (the direction perpendicular to the surface of the optical disk).
By adjusting the distance between the optical disk and the window so that the distance between the optical disk and the window can be adjusted, an error in the distance between the optical disk and the window due to a manufacturing error of the cartridge can be compensated. High-density recording / reproduction becomes possible. In addition, by forming the SIL integrally with the window, the window itself can function as the SIL, and thus the gap between the optical disc and the SIL can be further reduced. Further, since it is not necessary to incorporate the SIL into the optical pickup head of the recording / reproducing apparatus, it is easy to create the head, and the optical disk (DVD,
CD) and the like. Further, the optical disk cartridge is provided with a mechanism for fixing the optical disk when not in use at a position farther from the window than when in use, so that the lower surface of the window is closer to the upper surface of the optical disk, but the optical disk is stored during storage. Can be prevented from contacting the window when subjected to vibration and shock, and can be stored safely. Further, the optical disk cartridge is provided with a shutter that covers the window when not in use, thereby preventing dust from adhering to the window when not in use.

Further, the distance between the inner surface of the cartridge and the inner surface of the optical disk is set to a short distance, a part of the window is made a transparent window, and a solid immersion lens is provided in the window to use an optical system using a solid immersion lens. Although this is not theoretically impossible, it is practically impossible and impractical to manufacture a cartridge with high precision to meet such a demand. Even if it is possible to manufacture a cartridge with such high precision, the gap between the entire upper surface of the optical disk and the lower surface of the cartridge becomes extremely small, so that the rotation of the optical disk due to the air layer interposed in the minute gap is prevented. When the resistance increases and the air resistance increases, the force for pressing the optical disk (the pressing force due to the above-mentioned "flying force") increases, thereby bending the optical disk and reducing the resistance due to the thrust bearing of the optical disk. The problem of increase occurs. On the other hand, according to the present invention, the distance between the lower surface of the window and the upper surface of the optical disk is set to a very small distance, while the manufacturing accuracy of the cartridge is relatively rough (the same manufacturing accuracy as the conventional optical disk cartridge). In addition, the air resistance against the rotation of the optical disk and the above-mentioned resistance due to the bearing can be suppressed to the same level as those of the conventional optical disk cartridge, and the occurrence of the above-mentioned bending of the optical disk due to the increase of the above-mentioned air resistance can be avoided. be able to. This is a great advantage of the present invention.

2. Effects of the Invention According to Each Claim The effects corresponding to each invention according to each claim are summarized as follows. (1) Effects of the invention according to claim 1 The position of a transparent window for transmitting light of a light source wavelength for performing recording and reproduction on a cartridge having a built-in optical disk is lowered from the upper surface of the cartridge to the optical disk side and is brought close to the surface of the optical disk. As a result, the gap between the lower surface of the window and the upper surface of the optical disk is made as small as possible, and as a result, the distance between the SIL located above or on the upper surface of the window and the upper surface of the optical disk is made as close as possible. it can. Further, since the cartridge can always be kept in a sealed state, dust is prevented from adhering to the surface of the optical disk and being interposed between the optical disk and the upper surface of the SIL. Further, in this configuration, since the optical disk side view of the cartridge and the optical disk do not come close to each other, it is not necessary to increase the processing accuracy of the cartridge so much, and it is sufficient to manufacture the optical disk only with such accuracy that only the window can be brought close to the optical disk. Further, since the area of the proximity is small, the resistance due to the air entering between the disk and the cartridge is reduced, and the disk can be easily rotated at high speed. (2) Effects of the Invention According to Claim 2 Since the distance between the optical disk and the window can be adjusted, an error in the distance between the optical disk and the window due to a manufacturing error of the cartridge can be guaranteed, whereby Higher density recording and reproduction can be performed. (3) Effects of the Invention According to Claim 3 The window can be moved in the direction perpendicular to the optical disk, and the structure of the cartridge can be simplified. (4) Effect of the Invention According to Claim 4 Since the liquid film can prevent dust from entering, the movable range of the window can be widened as compared with the invention according to Claim 3. (5) Advantage of the invention according to claim 5 By forming the SIL integrally with the window, the window itself can function as the SIL.
Can be further reduced. Further, since it is not necessary to incorporate the SIL into the optical pickup head of the recording / reproducing apparatus, it is easy to manufacture the optical head, and it is possible to make the optical head compatible with other specification optical disks (DVD, CD, etc.). (6) Effect of the Invention According to Claim 6 By making the shape of the SIL integrated with the window a cylindrical lens, the means for moving the position of the window in the radial direction can be omitted. Can be simplified. (7) Advantageous Effects of the Invention According to Claim 7 Since the coil is integrated with the window, high-density recording and reproduction can be performed on the magneto-optical disk. Further, since it is not necessary to incorporate a coil in the optical head portion of the recording / reproducing apparatus, compatibility with a magneto-optical disk and a phase-change optical disk can be achieved with one optical head. (8) Effect of the invention according to claim 8 In the structure in which the window is levitated above the optical disk by utilizing the airflow flowing between the window and the optical disk, the airflow between the window and the optical disk can be controlled, so that the window and the optical disk can be controlled. Can be minutely controlled. (9) Advantages of the invention according to claim 9 Even if the writing / reading position changes up and down while the optical disk is rotating due to bending or manufacturing error of the optical disk, the window is automatically opened in response to the change. The height can be followed. (10) Advantages of the invention according to claim 10 Even if the optical disk has a warp in the radial direction (a mortar-shaped warp), and the flat window partially widens the distance between the window and the optical disk, the window can be used. By adjusting the angle, the window can be made closer to an arbitrary position on the optical disk in accordance with a change in the reading position. (11) Effect of the invention according to claim 11 Since the area close to the optical disk is reduced, the window and the optical disk are easily brought close to each other. (12) Effect of the invention according to claim 12 Even if the lower surface of the window is brought close to the upper surface of the optical disk, the optical disk can be prevented from coming into contact with the window due to vibration and shock during storage, and can be stored safely. (13) Advantages of the invention according to claim 13 Adhesion of dust to windows when not in use can be prevented. (14) Advantageous Effects of the Invention According to the fourteenth aspect, since a SIL can be used in a convertible phase-change optical recording / reproducing apparatus, a higher-density recording / reproducing apparatus can be manufactured. (15) Effect of the Invention According to Claim 15 In the replaceable magneto-optical recording / reproducing apparatus, since the SIL can be used, a higher-density recording / reproducing apparatus can be manufactured.

[Brief description of the drawings]

FIG. 1 is a plan view of an optical disk cartridge according to a first embodiment.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a sectional view of an operation state of the first embodiment.

FIG. 4A is a plan view of a window according to a second embodiment, and FIG.
FIG. 9 is a cross-sectional view of the second embodiment.

FIG. 5A is a plan view of an example of a window moving unit according to the second embodiment, and FIG. 5B is a plan view of another example of the window moving unit of the second embodiment.

FIG. 6 is a sectional view of a conventional example.

FIG. 7A is a plan view showing an arrangement of an optical disc and an SIL when a cylindrical lens is used in Example 2, and FIG. 7B is a comparison diagram of an arrangement of an optical system and a spot shape in FIG. is there.

FIG. 8A is a plan view of the first embodiment in which a mechanism for attenuating disk vibration is attached to a window in the first embodiment;
(B) is an AA sectional view in (a).

FIGS. 9A and 9B are cross-sectional views of the first embodiment in which the window has a cross-sectional shape protruding toward the optical disk.

FIG. 10 is a cross-sectional view of Embodiment 1 in which a projection is provided on a surface of the window on the optical disk side.

11A is a sectional view of a storage state of the third embodiment, and FIG. 11B is a sectional view of a use state of the third embodiment.
(C) is a plan view when a liquid is sandwiched between the window and the cartridge of the embodiment, (d) is a cross-sectional view of (c), and (e) is a state different from (d). FIG.

FIG. 12 is a sectional view of an SIL and a coil integrated into a window.

[Description of sign]

 11: Optical disk 12: Optical disk cartridge 13: Window 14: Hub 15: Fixing means 31: Solid immersion lens (SIL) 32: Objective lens 41: Window 42, 51, 52: Moving means

Claims (15)

[Claims] An optical disk cartridge for an optical disk device using a solid immersion lens is provided with a window through which light having a wavelength of a writing / reading light source is transmitted. An optical disk cartridge having a surface close to the optical disk cartridge. 2. The optical disk cartridge according to claim 1, wherein the position of the window is adjustable in the direction of the optical disk, so that the distance between the optical disk and the window can be adjusted. 3. When not in use, the window contacts the mounting hole formed in the cartridge to seal the cartridge, and when in use, the window is separated from the hole by a distance smaller than the size of dust generated in the recording / reproducing apparatus. 3. The optical disk cartridge according to claim 2, wherein the optical disk cartridge approaches the optical disk. 4. A non-volatile liquid such as silicone oil is interposed between the window and the hole of the cartridge. Even when the window is close to the optical disk, the non-volatile liquid is applied between the window and the cartridge by surface tension. An optical disc cartridge characterized in that a film is formed therebetween to prevent dust from entering. 5. The optical disk cartridge according to claim 1, wherein a solid immersion lens is formed integrally with said window. 6. The optical disk cartridge according to claim 5, wherein the SIL is a cylindrical lens extending in a radial direction of the optical disk. 7. The optical disk cartridge according to claim 1, wherein a coil capable of generating a magnetic field in a direction perpendicular to the optical disk is formed integrally with the window. 8. The optical disk cartridge according to claim 1, wherein the surface of the window on the optical disk side is divided into a plurality of surfaces by grooves. 9. The optical disk cartridge according to claim 1, wherein said window fixing means is made of any one of elastic materials such as a spring, a sponge, and a viscous fluid, or a combination thereof. 10. A cross section of the window in a radial direction of the optical disk,
The optical disk cartridge according to claim 1, wherein the optical disk cartridge has a convex surface with respect to the optical disk. 11. The optical disk cartridge according to claim 1, wherein a portion where light is focused on the surface of the window on the optical disk side is higher than other portions. 12. The optical disk cartridge according to claim 1, further comprising a mechanism for fixing the optical disk when not in use at a position farther from the window than when using the optical disk. 13. An optical disk cartridge according to claim 1, further comprising a shutter for covering said window when not in use. 14. A phase change type optical recording / reproducing apparatus using the optical disk cartridge according to claim 1. 15. A magneto-optical recording / reproducing apparatus using the optical disk cartridge according to claim 1.