JPH08297943A - Method, cartridge, and device for preventing electrification of optical disk - Google Patents

Abstract

PURPOSE: To effectively let static electricity accumulated on an optical disk escape by grounding the surface of the protective layer of the disk. CONSTITUTION: When a cartridge 1 is inserted into a disk drive, a light, soft, and flexible conductive rubber sheet which comes into contact with the protective coat 4 of an optical disk having a recording layer 5 on a resin substrate 6 is connected to the metal section of the disk drive which is grounded through a metal section 2 provided on the upper shell of the cartridge 1. Therefore, the static electricity accumulated in the coat 4 can be easily made to escape and the dust resistance of the optical disk can be improved against the dust which is attracted to the disk by static electricity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc antistatic method and apparatus for recording, reproducing and / or erasing information by laser light or the like.

[0002]

2. Description of the Related Art In recent years, an optical disk for recording, reproducing and / or erasing high density information by using a light beam such as a laser beam has been attracting attention. Among optical discs, magneto-optical discs capable of rewriting information have already been put into practical use and the market is expected to expand. Generally, an optical disc is prepared by forming a recording layer on a guide groove of a transparent disk-shaped resin substrate such as polycarbonate, polymethylmethacrylate, or amorphous polyolefin having a guide groove on one side by a sputtering method or the like.

At this time, if the recording layer is scratched or the recording layer corrodes, correct signals cannot be recorded and / or reproduced, so an organic protective layer called a protective coat is provided on the surface of the recording layer. Further, the optical disc performs recording and reproduction by injecting laser light from the substrate surface on the opposite side of the recording layer, and if the substrate surface is scratched, correct signals cannot be recorded and / or reproduced. Is provided with an organic protective layer called a hard coat. 2 above
Each of the seed organic protective layers is often formed by a cured film of an actinic ray curable resin that is cured by irradiation with an actinic ray such as an ultraviolet ray or an electron beam.

On the other hand, since the optical disk substrate has a high electric resistance, it is easily charged with static electricity during use to adsorb dust in the air. Particularly, when dust adheres to the surface of the hard coat, the path of the laser beam is obstructed and recording / reproducing errors occur. Is more likely to occur.
Therefore, a method has already been proposed in which the hard coat has an antistatic function to prevent the adhesion of dust. As a method of imparting an antistatic function, a method of incorporating an antistatic agent such as a surfactant or transparent conductive fine particles such as tin oxide into an actinic ray curable resin forming a hard coat is generally used.

However, if the cured film of the actinic ray curable resin constituting the hard coat is to have the above-mentioned antistatic function, the hardness, transparency, adhesion to the substrate required for the hard coat, Other characteristics such as long-term durability are greatly sacrificed, and the original hard coat function is likely to fail. For example, even if an antistatic agent is added to an actinic radiation curable resin, it is necessary to increase the amount to be added, so that the hardness, adhesiveness, moisture resistance and water resistance are impaired, and whitening and blooming of the antistatic agent are prolonged. Problems such as surface stickiness are likely to occur. Further, addition of conductive fine particles such as tin oxide also impairs properties other than antistatic properties. Moreover, since the hard coat surface is the side on which the laser light is incident, if whitening, stickiness, scratches or peeling of the surface occurs, recording / reproduction of the disk cannot be performed, which may be a fatal defect for the optical disk. As described above, it is very difficult to satisfy other characteristics while giving the hard coat, which is the laser light incident surface, a sufficient antistatic function.

Further, when an optical disc is manufactured by a normal method, the hard coat surface is usually in a state of being electrically insulated from the surrounding environment, and a leak route of static electricity charged on the hard coat surface is not secured. As long as only the hard coat has an antistatic function, the effect is small.

As a method for securing a static electricity leakage path on the hard coat surface, a method of leaking static electricity by grounding the hard coat surface is known. For example, Japanese Patent Application Laid-Open No. 2-24889 discloses a method of preventing electrostatic charge by bringing a grounded conductive cleaner brush into contact with a hard coat surface which is a laser light incident surface. In this method, the brush is hard coated. It is necessary to contact the entire area of the surface, and there are drawbacks such as abrasion of the brush to damage the laser light incident surface, and a complicated mechanism for driving the brush. When used in combination with the antistatic hard coat, the contact area of the brush can be reduced, but in this case, the above-mentioned problems occur due to the antistatic hard coat.

Further, as disclosed in JP-A-3-263624 and JP-A-5-144214,
A method of leaking static electricity on the laser light incident surface through the hub portion is also known, but this also requires an antistatic treatment on the laser light incident surface, which causes the above-mentioned problems due to antistatic of the hard coat. .

[0009]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and even if a hard coat, which is a laser light incident surface of an optical disk, does not have an antistatic function, the disk is It is an object of the present invention to provide an optical disc cartridge and an optical disc drive having an antistatic method for preventing the above-mentioned electrostatic charge, and a mechanism capable of implementing the antistatic method.

[0010]

The present invention relates to an optical disc in which a recording layer and an organic protective layer are sequentially formed on a disc-shaped substrate, and the surface of the organic protective layer on the recording layer is grounded. An antistatic method, a cartridge, and a drive device are provided. In addition, in the present invention, the ground is not necessarily connected directly to the earth, and may be connected to an object having a large electric capacity and having substantially the same potential as the earth through a conductive object. means.

Further, the present invention provides an optical disk cartridge comprising an optical disk having a recording layer formed on one surface of a disk-shaped substrate, and an organic protective layer formed on the recording layer, and a portion for accommodating the optical disk. The accommodating portion is composed of an antistatic portion that can come into contact with a conductive portion of the drive, and a conductive member that can come into contact with the surface of the organic protective layer on the recording layer of the optical disk and that electrically connects the antistatic portion of the accommodating portion. An optical disk cartridge having an electrostatic leakage path is provided. The antistatic portion of the storage portion may be a shutter or any other electrically conductive member used.

In the present invention, the whole or a part of the surface of the shell is antistatic-treated, or the shell itself is formed of a resin having an antistatic function, and the organic protective layer on the recording layer of the optical disc. The present invention provides an optical disk cartridge having a mechanism for electrically connecting the surface and an antistatic treatment site on the shell surface.

Further, the present invention is an optical disc drive for recording and reproducing information on an optical disc having a recording layer formed on one surface of a disk-shaped substrate and further having an organic protective layer formed on the recording layer. The present invention provides an optical disk drive characterized by having a mechanism for grounding on the surface of the organic protective layer.

[0014]

According to the optical disk antistatic method of the present invention,
When at least one point on the surface of the organic protective layer on the recording layer is grounded, the surface potential due to static electricity charged on the hard coat surface of the optical disk is instantaneously halved. The reason for this is unknown, but it is considered that the conductive recording layer plays an important role.

Further, the conventional method of giving the antistatic function to the hard coat is a method of discharging static electricity along the surface of the hard coat, whereas the method of the present invention is
This is a method in which static electricity is leaked in the thickness direction of the disk. Therefore, this method is completely different from the conventional antistatic method. Therefore, since the decrease in surface potential is not related to the surface resistance of the surface of the hard coat, it is not necessary to give the hard coat an antistatic function, and various problems associated with giving the hard coat an antistatic function are involved. Can be resolved.

Further, the optical disk cartridge of the present invention has a static electricity leakage path for electrically connecting the organic protective layer on the recording layer of the optical disk and the antistatic portion of the storage portion, and the antistatic portion of the storage portion is electrically conductive of the drive. It is designed to be able to contact the part. The above-mentioned antistatic method of grounding the surface of the organic protective layer can be applied when a conductor having a large electric capacity having substantially the same potential as the earth, such as a conductive part of a drive, is contacted. It is possible to effectively reduce the surface potential due to the charging.

In the optical disk cartridge of the present invention, the whole or a part of the surface of the shell is subjected to antistatic treatment, or the shell itself is formed of a resin having an antistatic function, and the antistatic treated portion of the shell and the disc. It has a mechanism for electrically connecting the surface of the organic protective layer on the recording layer.
Not only can the surface of the organic protective layer be grounded simply by touching the antistatic treatment part of the shell with a conductor with a large electric capacity, which has almost the same potential as the earth, but it also prevents the shell from being charged due to friction when handling the disc cartridge. Since the shell itself can prevent dust from being attracted, or the disk inside can be prevented from being charged to the opposite electric charge under the influence of the charging of the shell, the disk and the shell can be used in any usage situation of the optical disk cartridge. Can be prevented from being charged.

The optical disk drive of the present invention has a function of electrically connecting the conductive portion of the drive and the surface of the organic protective layer on the recording layer of the disk when the optical disk drive is inserted into the drive.
Since the surface of the organic protective layer on the recording layer of the disc can be grounded, the above-mentioned antistatic method can be applied, and the surface potential due to the electrification of the hard coat surface can be effectively reduced.

[0019]

【Example】

(Example 1) Several commercially available 3.5-inch single-plate magneto-optical disk cartridges were disassembled and the magneto-optical disk therein was taken out. In each case, the substrate was made of polycarbonate and had a substrate thickness of about 1.2 mm, and the organic protective layer (hereinafter referred to as a protective coat) on the recording layer had a thickness of about 15 μm. The surface resistance of the hard coat of each disk is 25 ° C and 50% RH.
It was as shown in.

[0020]

[Table 1]

The central metal hub is held by an insulative holder, and the corona discharge is uniformly applied to the hard coat surface of each disk, and the entire hard coat surface is about +1.0 k.
It was charged to V. The surface potential was measured with an electrostatic measuring instrument Statiron M2. The following tests were performed on the disc in this state. All tests are at room temperature 25 ° C and humidity 40%
It was conducted in the RH room.

1) A stainless steel rod (width: 6 mm, thickness: 0.2) with only the hub portion held by an insulating holder.
(mm) was brought into contact with the surface of the protective coat for a predetermined time to perform grounding. After the contact, the stainless rod was released and the surface potential of the hard coat surface was measured. The test was conducted for various contact times, and the change with time of the surface potential was measured. Table 2 shows the half-life of the surface potential. The surface potential of each of the discs quickly decreased to half within about 1 second.

2) The tip of the stainless steel rod was brought into contact with the surface of the hard coat for a predetermined time while holding only the hub portion with the insulating holder. After the contact, the stainless steel rod was released, the surface potential of the hard coat surface was measured, and the change with time of the surface potential was measured in the same manner as above. Table 2 shows the half-life of the surface potential. The half-life was shorter as the surface resistance of the hard coat was smaller, but the surface potential was significantly slower than when the protective coat surface was grounded, except for the disk with the lowest surface resistance of the hard coat. .

3) While holding only the hub portion by the insulating holder, each disk was left in a state of being separated from surrounding objects so as not to be affected by static electricity. The surface potential was measured after a predetermined time, and the change with time of the surface potential was measured. Table 2 shows the half-life of the surface potential. Regardless of the surface resistance of the hard coat, the time required to reduce the surface potential was extremely long compared with the case of grounding.

[0025]

[Table 2]

As described above, in order to reduce the surface potential of the hard coat surface due to static electricity, it is most effective to ground the protective coat surface. Also, the reduction of the surface potential was almost instantaneous, so it was found that grounding for a short period of time had a sufficient effect as needed. Further, according to the method of the present invention, regardless of the surface resistivity of the hard coat, since static electricity can be leaked, it is not necessary to perform an antistatic treatment on the hard coat, and as a function-oriented design,
It was possible to improve the reliability as an optical disc.

The basic structure of an optical disc to which the method of the present invention is applied is that a recording layer and an organic protective layer are sequentially formed on one surface of a disk-shaped substrate, and the recording layer has a single-layer or multi-layer structure, and at least one layer is It is made of a conductive film such as metal. An organic protective layer made of an ultraviolet curable resin or the like is formed on the surface of the recording layer.

The optical disk to which the antistatic method of the present invention is applied preferably has a hard coat layer on the laser light incident surface in order to prevent scratches on the surface. The hard coat can be formed by a known coating method such as a spin coating method on a cured film of an actinic ray curable resin, but it may be formed by other methods. According to the present invention, it is not necessary for the hard coat to have an antistatic function, and accordingly, the design should place importance on the basic properties of the hard coat such as hardness, transparency, smoothness, and adhesion to the substrate. Can be done. Of course, the hard coat may have an antistatic function as long as these characteristics are not sacrificed.

The disk-shaped substrate of the optical disk is made of glass or plastic such as polycarbonate or polymethylmethacrylate, and has a thickness of 0.5 mm to 1.
It is preferably about 5 mm. If it is less than this, the mechanical strength of the optical disk is poor, and if it is more than this, the antistatic function of the present invention is poor. In addition, by mixing a conductive material into the substrate,
Reducing the volume resistivity of the substrate will further improve the antistatic effect of the present invention, but a practically sufficient antistatic effect can be obtained without particularly incorporating the conductive substance.

The organic protective layer on the recording layer can be formed by a known coating method such as spin coating, which is a cured coating of an actinic ray curable resin which is cured by irradiation with ultraviolet rays or electron beams. It may be formed by the above method. The thickness of the organic protective layer on the recording layer is preferably about 1 to 50 μm, and if it is less than this, the protective performance of the recording layer may be poor, and if it is more than this, the antistatic performance may be poor. The composition of the organic protective layer on the recording layer is not particularly limited, but may contain, for example, a conductive component such as an antistatic agent or other additives. In particular, mixing a conductive substance to lower the volume resistivity of the organic protective layer on the recording layer further improves the antistatic effect of the present invention, but in practice, the thickness of the organic protective layer on the recording layer is applied. Since it is remarkably small relative to the area, a sufficient antistatic effect for practical use can be obtained without particularly incorporating a conductive component.

Next, an optical disk antistatic method of the present invention will be described. The antistatic method of the present invention is achieved by grounding at least one point on the surface of the protective layer. When the organic protective layer on the recording layer is formed in a wider area than the area where the recording layer is formed, it is necessary to ground the organic protective layer surface above the area where the recording layer is formed. There is.

The grounding can be carried out at all times while the optical disk is being handled or used, but it is preferable to carry out the grounding if necessary. In particular, it is preferable to discharge the static electricity by appropriately grounding when the disk is easily charged, such as immediately after handling, insertion of a drive, and ejection.

(Embodiment 2) FIG. 1 shows a schematic view of an embodiment of the optical disk cartridge of the present invention. In FIG.
1 is an upper shell, 2 is a metal part, 3 is a conductive rubber sheet,
Reference numeral 4 is a protective coat which is an organic protective layer, 5 is a recording layer, 6 is a resin substrate, 7 is a hard coat, 8 is a lower shell, and 9 is a hub. The metal portion 2 and the conductive rubber sheet 3 are connected, and the metal portion 2 comes into contact with the metal portion of the drive when the optical disk cartridge is mounted on the drive. That is, in the optical disk cartridge of FIG. 1, the electrostatic leakage path is formed by the metal portion 2 and the conductive rubber sheet 3.

Further, the conductive rubber sheet 3 is lightweight and flexible, and can contact the surface of the protective coat 4 when the disk is not rotated at high speed to make the electrostatic leakage path of the shell and the surface of the protective coat conductive. . .

In this optical disc cartridge, even if the disc is charged, the surface of the protective coat can be grounded through the static electricity leakage path of the shell when the drive is inserted, and the static electricity is quickly discharged. Further, when the disc is rotating at high speed, the sheet-like object floats away from the disc surface, so that the rotation of the disc is not hindered. Although the sheet-like object made of conductive rubber is shown here as the grounding member, it may be made of a conductive resin or ceramic as well as a material such as metal or carbon in addition to rubber, and has a sheet-like shape. The shape is not limited to the above, and may be a thread shape, a string shape, a rod shape, or another complicated shape. The grounding member may be composed of a plurality of parts. Needless to say, the material and shape of the grounding member are not particularly limited, and any disk cartridge having a structure capable of grounding the surface of the protective coating is included in the present invention.

FIG. 2 is a schematic view of another embodiment of the optical disk cartridge of the present invention. In FIG. 2, 1 is an upper shell, 3 is a conductive rubber sheet, 4 is a protective coat that is an organic protective layer, 5 is a recording layer, 6 is a resin substrate, 7 is a hard coat, 8 is a lower shell, and 9 is a hub. 10 is an antistatic layer.

The back surface of the upper shell 1 (the side facing the disk)
A sheet-like object 3 made of conductive rubber hangs down from. This sheet-like object is lightweight and flexible, and can be brought into conduction between the antistatic layer of the shell and the surface of the protective coat by contacting the surface of the protective coat except when the disk is rotated at a high speed. This optical disk cartridge is
Even if the disk is charged, a static electricity leakage path is formed when the drive is inserted or when a person manually handles the shell, and the static electricity on the disk is quickly discharged. Further, since the shell itself has an antistatic function, there is no possibility that dust will be sucked into the cartridge and the inner disk will be charged with opposite charges due to the charging of the shell.

As the antistatic method for the shell of the optical disk cartridge shown in FIG. 2, a method of kneading a conductive material such as carbon into a resin constituting the shell, or a method of applying a coating agent having an antistatic function to the shell surface is possible. Is.

As the antistatic treatment method by coating, all known methods can be used. That is, the coating agent contains low molecular weight and high molecular weight surfactants, hydrophilic group-containing monomers and oligomers having a functional group curable by irradiation with actinic rays, conductive fine particles such as tin oxide, and other antistatic components. It is also possible to apply a low molecular weight and high molecular weight surfactant-containing solvent, to form a film of an antistatic component composed of a siloxane compound, or a low molecular weight and high molecular weight surfactant, A hydrophilic group-containing monomer or oligomer having a functional group curable by light irradiation, conductive fine particles such as tin oxide, and a curable resin containing other antistatic components may be applied and cured to form a film. .

A conductive thin film may be formed on the shell surface by physical or chemical vapor deposition means such as sputtering. The antistatic treatment is preferably applied to the entire shell, but it may be applied partially. When applying it partially,
It is preferable to apply it to the area on the shell where static electricity leaks when the drive is inserted or handled by hand.

Next, the antistatic effect of the optical disk cartridge of the present invention will be described. The following tests were conducted on the above-mentioned optical disk cartridge of the present invention and an optical disk cartridge having another configuration. Here, a plurality of the same commercially available cartridges are prepared, and those shell parts of which are processed as shown in FIG. 1 (E) and those processed as shown in FIG. 2 (F) are not processed. The thing corresponds to (G).

1) Open the shutter of the cartridge,
The hard coat surface of the inner disk was rubbed 10 times with rubber gloves. Furthermore, immediately after (a) rubbing, (b) after rubbing, once inserted into a general magneto-optical disk drive and ejected, and (c) after rubbing, left for 24 hours to disassemble the cartridge and disassemble it. The surface potential of the shell was measured. Incidentally, the disc was held only by the insulating tweezers only at the hub portion so as not to touch the disc surface at all, and in the optical disc cartridge of FIG. 1, the metal portion of the shell was not touched by hand. The surface potential of the shell was measured from above the surface of the upper shell with the upper shell and the lower shell being combined. The results are shown in Table 3. In the optical disk cartridge configured as shown in FIG. 1, the static electricity on the disk was quickly leaked when it was put in the drive. In FIG. 2, the static electricity was leaked because humans just held the shell surface with their hands. I didn't. On the other hand, in the conventional optical disc, not only the static electricity of the disc does not leak, but also the shell is charged with the opposite charge, and the state where they are charged with each other for a long time continues.

[0043]

[Table 3] Disc cartridge name E Optical disc cartridge of FIG. 1 Disc cartridge name F Optical disc cartridge of FIG. 2 Disc cartridge name G Commercially available optical disc cartridge

2) The upper shell surface of the cartridge was rubbed 10 times with rubber gloves. Further, (a) immediately after rubbing (b)
After rubbing, insert it into a general magneto-optical disk drive once,
After discharging and rubbing (c), it was left for 24 hours to disassemble the cartridge, and the surface potentials of the inner disk and shell were measured. Incidentally, the disc was held only by the insulating tweezers only at the hub portion so as not to touch the disc surface at all, and in the optical disc cartridge of FIG. 1, the metal portion of the shell was not touched by hand. The results are shown in Table 4. When the shell was charged, the disk cartridge in which the shell itself was subjected to antistatic treatment as shown in FIG. 2 was most effective. The surface potential of the disk of FIG. 1 was almost reduced by inserting it into the drive, so that there was a practical effect.

[0045]

[Table 4] Disc cartridge name E Optical disc cartridge of FIG. 1 Disc cartridge name F Optical disc cartridge of FIG. 2 Disc cartridge name G Commercially available optical disc cartridge

(Embodiment 3) Further, an optical disk drive of the present invention will be described with reference to the drawings. FIG. 3 shows a schematic diagram of an embodiment of the optical disk drive of the present invention. In FIG. 3, 11 is a grounding arm and 12 is a conductive rubber.
A grounding arm 11 is installed on the side of the disk facing the protective coat side. This arm is made of a conductive material, and one end is connected to the metal part of the drive or the ground circuit.
The other end can contact the surface of the protective coat.

Normally, the disc cartridge is retracted to a position where it does not hinder the insertion and ejection, but when the optical disc cartridge is inserted into the drive and the shutter is opened, the arm moves, and the tip of the arm moves to the surface of the disc protective coat. To contact. Since the tip of the arm does not damage the surface of the protective coat, it is made of conductive rubber 12. When the disk starts to rotate, the tip of the arm separates from the disk surface due to buoyancy, but when the disk stops rotating, the arm tip contacts the disk surface again. Depending on the charged state of the disk, the rotation of the drive can be stopped and the static electricity on the disk can be leaked. When the disc cartridge is ejected, the arm moves to the retracted position again. Of course, the arm does not have to be a conductive member, and the protective coat contact portion and the drive metal portion are connected by an electric wire or the like, and the arm may simply hold the electric wire.

In the optical disk drive of the present invention,
The mechanism for grounding is not particularly limited, but for example, part of a flexible conductive material such as conductive rubber or conductive thread connected to the ground circuit may come into contact with the surface of the organic protective layer on the recording layer when the cartridge is inserted. Just do it. Alternatively, a magnetic field modulation type drive device having a floating magnetic head may be provided with a mechanism for bringing the metal portion of the magnetic head into contact with the surface of the organic protective layer on the recording layer, if necessary. Regarding the timing of the grounding, it is preferable to perform the grounding after the optical disk cartridge is inserted into the optical disk drive and before the rotation of the disk starts.

The above example is merely an example of the present invention.
It goes without saying that any form may be adopted as long as it is a drive device having a mechanism for grounding the surface of the protective coat.

[0050]

According to the method of the present invention, the static electricity on the disk surface can be leaked very quickly.
It is possible to prevent dust from being attracted to the disk surface by static electricity. Further, according to the method of the present invention, it is not necessary to impart an antistatic function to the surface of the hard coat as is conventionally done, and therefore, the properties that are contradictory to the antistatic function, such as hardness, adhesion, and transparency. Since a hard coat having improved characteristics such as durability can be formed, the reliability of the optical disc is significantly improved.

The optical disk cartridge of the present invention is
Since static electricity on the disc easily leaks when handling,
The cartridge can be made extremely excellent in dust resistance. Further, the effect is further exhibited by simultaneously performing antistatic treatment on the shell. The optical disk drive device of the present invention is
Since static electricity on the disc can be quickly leaked when the disc cartridge is inserted, it is possible to prevent dust from adhering to the surface of the disc in use, and the reliability of recording and reproduction is significantly improved.

[Brief description of drawings]

FIG. 1 is a schematic view of an embodiment of an optical disc cartridge of the present invention.

FIG. 2 is a schematic view of another embodiment of the optical disk cartridge of the present invention.

FIG. 3 is a schematic view of an embodiment of the optical disc drive of the present invention.

[Explanation of symbols]

 1 Upper Shell 2 Metal Part (Connected to Drive Metal Part) 3 Conductive Rubber Sheet 4 Protective Coat (Organic Protective Layer) 5 Recording Layer 6 Resin Substrate 7 Hard Coat 8 Lower Shell 9 Hub 10 Antistatic Layer 11 Grounding Arm 12 Conductive rubber

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shiro Miyata 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Steel Pipe Co., Ltd.

Claims (4)

[Claims] 1. A method for preventing electrification of an optical disk comprising a disk-shaped substrate on which a recording layer and an organic protective layer are sequentially formed,
An antistatic method for an optical disk, characterized in that the surface of the organic protective layer on the recording layer of the optical disk is grounded. 2. An optical disc cartridge comprising an optical disc having a recording layer and an organic protective layer sequentially formed on a disc-shaped substrate and a portion for accommodating the optical disc, the accommodating portion being capable of contacting a conductive portion of an optical disc drive. An optical disk cartridge comprising an electrostatic charge leakage path comprising an antistatic part and a conductive member which is in contact with the surface of the organic protective layer on the recording layer of the optical disk and electrically connects the antistatic part of the storage part. 3. An optical disc cartridge comprising an optical disc in which a recording layer and an organic protective layer are sequentially formed on a disc-shaped substrate, and a shell for accommodating the optical disc. Or a conductive member which is made of a resin having an antistatic function as a whole and which can be brought into contact with the surface of the organic protective layer on the recording layer of the optical disk and electrically connects with the antistatic portion of the shell. An optical disc cartridge having a static electricity leakage path consisting of 4. An optical disk drive for driving an optical disk and an optical disk cartridge including a shell for housing the optical disk, having a mechanism for electrically connecting an organic protective layer surface on a recording layer of the optical disk and a conductive portion of the optical disk drive. An optical disk drive characterized in that