JP2003045091A - Method of manufacturing optical recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing an optical recording medium which is capable of solving the problem to make initialization difficult particularly in the case of a phase transition layer by improving the handling of a thin light transparent film and suppressing flawing thereof in manufacturing the optical recording medium having >=2 layers of optical recording layers. SOLUTION: Rugged shapes are formed on one surface of a medium substrate 10 and the first optical recording layer 11 is formed on this rugged shape forming surface. On the other hand, rugged shapes are formed on one surface of the light transparent film 14 and the second optical recording layer 13 is formed on this rugged shape forming surface. Next, the first optical recording layer 11 and the second optical recording layer 13 are bonded together. Before the process step of forming the second optical recording layer 13, a supporting substrate 22 is bonded together to the surface of the light transparent film 14 on the side opposite to the rugged shape forming surface and the formation of the second optical recording layer 13 is performed in the state of bonding together the light transparent film 14 to the supporting substrate 22 in the process step of forming the second optical recording layer 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an optical recording medium (hereinafter also referred to as an optical disk), and more particularly to a method for manufacturing an optical recording medium having a plurality of optical recording layers.

[0002]

2. Description of the Related Art In recent years, in the field of information recording, researches on optical information recording methods have been advanced in various places. This optical information recording system has a number of advantages such as non-contact recording / reproducing, read-only type, write-once type, and rewritable type memory formats. A wide range of applications from industrial to consumer use are considered as possible methods.

Increasing the capacity of the above-mentioned optical recording medium for various optical information recording systems (hereinafter also referred to as an optical disk) is mainly due to the shortening of the wavelength of laser light used as a light source used in the optical information recording system and the high aperture. This has been achieved by reducing the spot size at the focal plane by employing several lenses.

For example, in a CD (compact disc), the laser light wavelength is 780 nm and the numerical aperture of the lens (N
A) was 0.45 and had a capacity of 650 MB,
In DVD-ROM (digital versatile disk-playback-only memory), the laser light wavelength is 650 nm and the NA is 0.6.
And the capacity is 4.7 GB. Further, in the next-generation optical disc system, an optical disc in which a thin light-transmitting protective film (cover layer) of, for example, about 100 μm is formed on the optical recording layer is used, and the laser light wavelength is 450 nm or less and the NA is 0. 2 by setting it to 78 or more
A large capacity of 2 GB or more is possible.

By the way, in recent years, there has been an increasing demand for a large storage capacity of such an optical disc, and in order to meet this demand, for example, Japanese Patent Laid-Open No. 11-136432 discloses an optical system having two or more layers. An optical disk provided with a recording layer has been proposed. FIG. 30A is a schematic perspective view showing how light is emitted from an optical disc provided with the above-mentioned two optical recording layers. The optical disc DC has a substantially disc shape with a center hole CH opened in the center, and is rotationally driven in the drive direction DR. When recording or reproducing information, the objective lens OL having a numerical aperture of 0.8 or more is recorded on the optical recording layer in the optical disc DC.
Thus, light LT such as laser light in a blue to blue-violet region is emitted.

FIG. 30 (b) is a schematic sectional view.
FIG. 30C is an enlarged sectional view of a main part of the schematic sectional view of FIG. A recess 10d is provided on one surface of a disk substrate 10 made of polycarbonate or the like having a thickness of about 1.1 mm by, for example, injection molding. This recess 1
The first optical recording laminate 11 is formed along the unevenness including 0d. The first optical recording layer 11 has a structure in which, for example, a dielectric film, a recording film such as a phase change film, a dielectric film, and a reflective film are laminated in this order from the upper layer side. Depends on material type and design. An adhesive layer 12 is formed on the first optical recording layer 11, and a second optical recording layer 13 is formed on the adhesive layer 12. The second optical recording layer 13 has a structure in which a recording film such as a dielectric film and a phase change film, a dielectric film, and a semi-transmissive reflective film are laminated in this order from the upper layer side. Depends on the type and design of the recording material. On the upper layer of the second optical recording layer 13, for example, the light transmissive film 1 having a film thickness of 0.1 mm.
4 are formed. The light transmissive film 14 is provided with a recess 14d on the surface on the second optical recording layer 13 side.
The second optical recording laminate 13 is formed along the irregularities including the concave portions 14d.

When recording or reproducing the above-mentioned optical disc, a light L such as a laser beam is passed through the objective lens OL.
T is irradiated from the light-transmissive film 14 side so as to focus on the first optical recording layer 11 or the second optical recording layer 13.
Adjusting the distance of the objective lens OL from the optical disc
Depending on whether the optical recording layer 11 or the second optical recording layer 13 is focused, either the first optical recording layer 11 or the second optical recording layer 13 is selectively recorded or reproduced. With the above configuration, the second optical recording layer 13 is semi-transparent, and when the light LT is applied to the first optical recording layer 11, the second optical recording layer 13 is transmitted. During reproduction of the optical disc, the return light reflected by any of the first and second optical recording layers (11, 13) is received by the light receiving element, and the signal processing circuit generates a predetermined signal to reproduce the reproduction signal. Is taken out.

In the optical disc as described above, the first optical recording layer 11 and the second optical recording layer 13 have a recess 10d formed on the surface of the disk substrate 10 or a recess 14d formed on the surface of the light transmissive film 14. It has an uneven shape due to. For example, this recess (10d, 1
The track region is divided by the uneven shape including 4d). The track areas divided by the recesses (10d, 14d) are called lands and grooves, and the capacity can be increased by applying a land / groove recording method for recording information on both the lands and the grooves. Also,
It is also possible to use only one of the land and the groove as the recording area.

Further, the concave and convex shapes due to the concave portions (10d, 14d) of the disk substrate 10 and the light transmissive film 14 described above are used as pits having a length corresponding to the recording data, and the optical recording film is reflected by an aluminum film or the like. By using a film, a read-only (ROM) type optical disk can be obtained.

As a method of manufacturing an optical disc having the above-mentioned two optical recording layers, for example, as shown in FIG. 31 (a), first, an injection molding using a stamper 20 having a concavo-convex pattern as a part of a mold is performed. Thus, the disk substrate 10 having the uneven pattern is formed. Here, the disk substrate 1
On the surface of 0, a concave portion (groove) 10d is formed at a position corresponding to the convex portion 20p of the stamper 20.

Next, as shown in FIG. 31 (b), a recording film such as a reflection film, a dielectric film, a phase change film, and a dielectric film are laminated in this order by, for example, a sputtering method and the like, and are formed in the recess 10d. The first optical recording layer 11 having a corresponding uneven shape is formed. When a phase change film is formed as the above recording film, next, as shown in FIG.
Infrared light IR is condensed by L, irradiated onto the first optical recording layer 11, heated and melted, and then rapidly cooled to be crystallized. This corresponds to the initialization process of the first optical recording layer 11.

On the other hand, as shown in FIG. 32 (a), for example, by pressing the light-transmitting film sheet on the stamper 21 having an uneven pattern while heating it, the protrusions 21p of the stamper can be dealt with. Recess in position (groove)
The light-transmissive film 14 on which 14d is transferred is formed.
Next, as shown in FIG. 32B, the obtained light transmissive film 14 is released from the stamper 21.

Next, as shown in FIG. 33 (b) which is a schematic view showing the whole of FIG. 33 (a) and a partially enlarged view thereof,
For example, the light transmissive film 14 is placed on the stage 40 in the sputtering apparatus, and as shown in FIG.
A dielectric film, a recording film such as a phase change film, a dielectric film, and a semi-transmissive reflective film are laminated in this order by a sputtering method to form a second optical recording layer 13 having an uneven shape corresponding to the groove 14d. To do. At this time, since the light-transmissive film 14 has low rigidity, wrinkles may occur when the film is placed on the stage 40, or the edges may be turned up, which makes it difficult to form a uniform film. Then, the jig 41 serving as a presser is installed on the end portion of the light transmissive film 14, and the film is formed as described above.

Next, as shown in FIG. 34 (b) which is a schematic view showing the whole of FIG. 34 (a) and a partially enlarged view thereof,
For example, the light transmissive film 14 having the second optical recording layer 13 formed thereon is placed on the stage 42 in the light irradiation device, as shown in FIG.
As shown in (c), the infrared light IR is transmitted by the objective lens OL.
Is condensed and applied to the second optical recording layer 13 to apply heat to melt it, followed by rapid cooling for crystallization. This corresponds to the initialization process of the second optical recording layer 13.

Next, as shown in FIG. 35, the first optical recording layer 11 formed on the disk substrate 10 and the second optical recording layer 13 formed on the light transmissive film 14 are bonded to each other by the adhesive layer 1.
Stick together by 2. As the adhesive layer 12, for example, an ultraviolet curable resin adhesive or a pressure sensitive adhesive can be used.

[0016]

However, in the method of manufacturing an optical disc having the above-mentioned two optical recording layers, the light transmissive film is very thin and thus difficult to handle, and the optical recording layer is formed on the surface thereof. However, there is a problem that the cost is increased because the film forming apparatus and the infrared light irradiation apparatus used in the initialization process are prepared for the film. Further, in the step of forming the optical recording layer on the surface of the light-transmitting film and performing the initialization, the light-transmitting film is directly placed on the stage in each device, so that it is easily scratched. There was a drawback. The light-transmissive film is a film that transmits light when recording or reproducing on an optical disc, and if the film is scratched, recording or reproduction may be disturbed.

Further, a large amount of fine dust is present in the apparatus for forming the optical recording layer on the surface of the light transmissive film, and the dust adheres when the light transmissive film is directly placed on the stage. It's easy to do. If initialization is performed by irradiation of infrared light in the next step with the dust attached in this way, FIG.
As shown in FIG. 3, dust DS is sandwiched between the light transmissive film 14 and the stage 42, and the light transmissive film 1
4 will float. In this case, the objective lens O
Since the margin of the depth of focus of the infrared light IR condensed by L is small, the light transmissive film 14 is not focused at the position of the second optical recording layer 13 in the part where it floats. There is a problem that initialization cannot be performed.

The present invention has been made in view of the above circumstances. Therefore, the object of the present invention is to handle a thin light-transmitting film in a method for producing an optical recording medium having two or more optical recording layers. It is an object of the present invention to provide a method for producing an optical recording medium, which is improved, suppresses scratches on the light-transmissive film, and can solve the problem that initialization is difficult particularly in the case of a phase change layer.

[0019]

In order to achieve the above object, the method for producing an optical recording medium of the present invention is a method for producing an optical recording medium having at least two optical recording layers, which is a medium substrate. Forming a concavo-convex shape on one surface of the medium substrate, forming a first optical recording layer on the concavo-convex shape forming surface of the medium substrate, and forming a concavo-convex shape on one surface of the light transmissive film. And a step of forming a second optical recording layer on the surface of the light-transmissive film having an uneven shape, and a step of bonding the first optical recording layer and the second optical recording layer together, at least the first 2 Before the step of forming the optical recording layer, there is a step of adhering the light-transmissive film to a supporting substrate with an adhesive layer on the surface of the light-transmissive film opposite to the surface on which the uneven shape is formed. The second optical recording layer In the step of forming, performs the light-transmitting film in a state laminated on the supporting substrate.

In the above-mentioned method for producing an optical recording medium of the present invention, preferably, in the step of attaching the light transmissive film to the supporting substrate with an adhesive layer, the adhesive strength between the adhesive layer and the supporting substrate is The adhesive layer and the light-transmissive film are bonded so that the adhesive strength between them is weaker than that of the adhesive layer. More preferably, as the adhesive layer, an adhesive layer having different adhesive strength on one surface and adhesive strength on the other surface is used.

In the above-mentioned method for producing an optical recording medium of the present invention, preferably, the first optical recording layer and the second optical recording layer are bonded together after the step of forming the second optical recording layer. Before the step, the method further includes a step of peeling at the interface between the light transmissive film and the adhesive layer. Alternatively, preferably, in the step of attaching the first optical recording layer and the second optical recording layer, it is performed in a state where the light transmissive film is attached to the supporting substrate, and the first optical recording layer and the After the step of attaching the second optical recording layer, the method further comprises a step of peeling at the interface between the light transmissive film and the adhesive layer.

In the above-mentioned method for producing an optical recording medium of the present invention, preferably, the light transmissive film is provided with a protect film on the surface opposite to the surface on which the uneven shape is formed, In the step of attaching the film to the supporting substrate, the protect film provided on the light transmissive film is attached to the supporting substrate via an adhesive layer. More preferably, after the step of forming the second optical recording layer and before the step of bonding the first optical recording layer and the second optical recording layer, the light transmissive film and the protect film are formed. The method further includes a step of peeling at the interface. Alternatively, more preferably, the second
After the step of forming the optical recording layer and before the step of attaching the first optical recording layer and the second optical recording layer, the method further includes a step of peeling at the interface between the protect film and the adhesive layer, After the step of attaching the first optical recording layer and the second optical recording layer, the method further includes a step of peeling at the interface between the light transmissive film and the protect film. Alternatively, more preferably, in the step of attaching the first optical recording layer and the second optical recording layer, the protective film provided on the light transmissive film is attached to the support substrate, After the step of bonding the first optical recording layer and the second optical recording layer, the method further comprises a step of peeling at the interface between the light transmissive film and the protect film.

In the above-mentioned method for producing an optical recording medium of the present invention, a hard coat agent is preferably used as the adhesive layer. More preferably, in the step of adhering the light transmissive film to the supporting substrate with an adhesive layer using a hard coating agent, the adhesive layer and the light transmitting layer are more strongly than the adhesive strength between the adhesive layer and the supporting substrate. It is attached so that the adhesive strength with the film is stronger. Alternatively,
More preferably, after the step of forming the second optical recording layer and before the step of bonding the first optical recording layer and the second optical recording layer, the supporting substrate and the hard coat agent are used. The method further includes the step of peeling at the interface of the adhesive layer. Alternatively, more preferably, in the step of bonding the first optical recording layer and the second optical recording layer, it is performed in a state where the light transmissive film is bonded to the supporting substrate, and the first optical recording layer is formed. After the step of adhering the second optical recording layer and the second optical recording layer, the method further comprises a step of peeling at the interface between the supporting substrate and the adhesive layer using the hard coating agent.

In the above-mentioned method for producing an optical recording medium of the present invention, preferably, the step of forming an uneven shape on one surface of the medium substrate and the uneven shape on one surface of the light transmissive film are formed. In the step, a groove that divides the track region is formed, and a phase change type optical recording layer is formed as the first and second optical recording layers. More preferably, the step of forming the first optical recording layer on the uneven surface of the medium substrate includes initialization of the first optical recording layer, and the step of forming the first optical recording layer on the uneven surface of the light transmissive film is performed. The step of forming the second optical recording layer includes initialization of the second optical recording layer.

In the above-mentioned method for producing an optical recording medium of the present invention, preferably, the step of forming an uneven shape on one surface of the medium substrate and the uneven shape on one surface of the light transmissive film are formed. In the step, a groove that divides the track region is formed, and a magneto-optical recording type optical recording layer is formed as the first and second optical recording layers. Further, preferably, in the step of forming an uneven shape on one surface of the medium substrate and the step of forming an uneven shape on one surface of the light transmissive film, forming a groove for partitioning the track region, An optical recording layer containing an organic dye is formed as the first and second optical recording layers. Further, preferably, in the step of forming the uneven shape on one surface of the medium substrate and the step of forming the uneven shape on one surface of the light transmissive film, the unevenness to be an information pit is formed, and Reflective films are formed as the first and second optical recording layers.

In the above-described method for producing an optical recording medium of the present invention, preferably, the step of forming an uneven shape on one surface of the light transmissive film is performed by forming the uneven shape on a stamper on which the uneven shape is formed. It includes a step of forming a light-transmitting film by providing a light-transmitting material so as to be transferred, and a step of peeling the light-transmitting film from the stamper. More preferably, after the step of forming a light-transmissive film by providing a light-transmissive material on the stamper on which the uneven shape is formed so as to transfer the uneven shape, the light-transmissive film is removed from the stamper. Prior to the step of peeling, on the surface opposite to the concavo-convex shape forming surface of the light transmissive film, the light transmissive film is bonded to a supporting substrate with an adhesive layer,
More preferably, in the step of attaching the light-transmissive film to the support substrate with an adhesive layer, the center hole provided in the support substrate and the center hole of the stamper are aligned using an eccentricity adjustment pin. The eccentricity of the supporting substrate is adjusted with respect to the concavo-convex shape of the light transmissive film, and the substrates are bonded together.

More preferably, in the step of forming a light-transmissive film by providing a light-transmissive material on the stamper on which the uneven shape is formed so as to transfer the uneven shape, the stamper is formed on the stamper. The light-transmissive film sheet is pressed while being heated. Further, more preferably, in the step of forming a light-transmissive film by providing a light-transmissive material on the stamper on which the uneven shape is formed so as to transfer the uneven shape, the light-transmittance on the stamper is increased. The film sheets are bonded together with a light-transmissive film adhesive, and the light-transmissive film adhesive is solidified. Further, more preferably, in the step of forming a light-transmissive film by providing a light-transmissive material on the stamper on which the uneven shape is formed so as to transfer the uneven shape, the light-transmittance on the stamper is increased. A film resin is applied to solidify the light transmissive film resin.

In the above-described method for producing an optical recording medium of the present invention, the uneven shape is formed on one surface of the medium substrate, and the first optical recording layer is formed on the uneven surface of the medium substrate. On the other hand, an uneven shape is formed on one surface of the light transmissive film,
The second optical recording layer is formed on the surface of the light transmissive film on which the uneven shape is formed. Next, the first optical recording layer and the second optical recording layer are bonded together. Here, before at least the step of forming the second optical recording layer, the light-transmissive film is attached to the supporting substrate by an adhesive layer on the surface of the light-transmissive film opposite to the concavo-convex shape forming surface, and at least the second optical recording layer is formed. In the step of forming the optical recording layer, the light transmissive film is attached to the supporting substrate. Furthermore, in the case of a phase change type optical recording layer, initialization is performed in that state.

According to the above-described method for producing an optical recording medium of the present invention, when an optical recording medium having two or more optical recording layers is produced, the optical transmission is performed with the light transmissive film bonded to the supporting substrate. Since the recording layer is formed and further initialized, the handling of thin light-transmissive film is improved, and the light-transmissive film does not have to be directly placed on the stage in the device, so Suppresses scratches on the film and prevents part of the light-transmissive film from floating on the stage due to dust, etc., thus solving the problem that initialization is difficult in the case of a phase change layer. .

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. The present embodiment relates to a method for manufacturing an optical recording medium (optical disc).

First Embodiment FIG. 1A is a schematic perspective view showing a state of light irradiation of an optical disc having two optical recording layers according to this embodiment. The optical disc DC has a substantially disc shape with a center hole CH opened in the center, and is rotationally driven in the drive direction DR. When recording or playing back information,
The optical recording layer in the optical disc DC is irradiated with light LT such as laser light in a blue to blue-violet region by an objective lens OL having a numerical aperture of 0.8 or more, for example.

FIG. 1 (b) is a schematic sectional view.
FIG. 1C is an enlarged sectional view of a main part of the schematic sectional view of FIG. Thickness is 0.3 mm or more (for example, 1.1 mm)
A recess 10d is formed on one surface of the disk substrate 10 made of polycarbonate or the like by injection molding, for example. The first optical recording laminate 11 is formed along the unevenness including the recess 10d. First optical recording layer 11
Is a structure in which a recording film such as a dielectric film and a phase change film, a dielectric film and a reflective film are laminated in this order from the upper layer side. different. The adhesive layer 12 is provided on the first optical recording layer 11.
Is formed, and the second optical recording layer 13 is formed thereon. The second optical recording layer 13 has a structure in which a recording film such as a dielectric film and a phase change film, a dielectric film, and a semi-transmissive reflective film are laminated in this order from the upper layer side,
The layer structure and the number of layers differ depending on the type and design of the recording material. On the upper layer of the second optical recording layer 13, a light transmissive film 14 having a film thickness of, for example, 0.1 mm is formed. The light transmissive film 14 is provided with a recess 14d on the surface on the second optical recording layer 13 side. The second optical recording laminate 13 is formed along the irregularities including the concave portions 14d.

When recording or reproducing the above-mentioned optical disc, a light L such as a laser beam is passed through the objective lens OL.
T is irradiated from the light-transmissive film 14 side so as to focus on the first optical recording layer 11 or the second optical recording layer 13.
Adjusting the distance of the objective lens OL from the optical disc
Depending on whether the optical recording layer 11 or the second optical recording layer 13 is focused, either the first optical recording layer 11 or the second optical recording layer 13 is selectively recorded or reproduced. With the above configuration, the second optical recording layer 13 is semi-transparent, and when the light LT is applied to the first optical recording layer 11, the second optical recording layer 13 is transmitted. During reproduction of the optical disc, the return light reflected by any of the first and second optical recording layers (11, 13) is received by the light receiving element, and the signal processing circuit generates a predetermined signal to reproduce the reproduction signal. Is taken out.

In the optical disc as described above, the first optical recording layer 11 and the second optical recording layer 13 have a recess 10d formed on the surface of the disk substrate 10 or a recess 14d formed on the surface of the light transmissive film 14. It has an uneven shape due to. For example, this recess (10d, 1
The track region is divided by the uneven shape including 4d). The track areas divided by the recesses (10d, 14d) are called lands and grooves, and the capacity can be increased by applying a land / groove recording method for recording information on both the lands and the grooves. Also,
It is also possible to use only one of the land and the groove as the recording area.

Further, the concave / convex shape resulting from the concave portions (10d, 14d) of the disc substrate 10 and the light transmissive film 14 is used as a pit having a length corresponding to the recording data, and the optical recording film is reflected by an aluminum film or the like. By using a film, a read-only (ROM) type optical disk can be obtained.

Next, a method for manufacturing an optical disc having the above-mentioned two optical recording layers will be described. First, a stamper 20 for a disk substrate having on its surface a concavo-convex pattern including a convex portion 20p which is an inverted pattern for transferring to the disc substrate by a predetermined method known in the related art.
To create. Next, as shown in FIG. 2A, the above-mentioned disk substrate stamper 20 is placed in the cavity formed by the molds (MD1, MD2), and the convex portion forming surface 20p ′ of the disk substrate stamper 20 is placed inside the cavity. The mold for injection molding is constructed by installing and fixing so as to face. By injecting a resin 10 ′ such as a molten polycarbonate from the injection port MS of the mold into the cavity of the injection molding mold, as shown in FIG. The disk substrate 10 is formed on top. Here, on the surface of the disk substrate 10, a concave portion (groove) 1 is provided at a position corresponding to the convex portion 20p of the disk substrate stamper 20.
0d is formed.

By releasing from the above injection molding die,
As shown in FIG. 3A, the disc substrate 10 having the concave-convex pattern including the concave portions 10d to be the groove pattern or the pit pattern on the surface is obtained. Next, FIG.
As shown in (b), after gas such as air or nitrogen gas is blown onto the surface of the disk substrate 10 to remove dust,
For example, the first optical recording film 11 having a laminated body of a reflective film, a dielectric film, a recording film, and a dielectric film is formed in this order by a sputtering method or the like. As the recording film, for example, a phase change type optical recording film, a magneto-optical recording film, or a recording film containing an organic dye can be used. Or R
In the case of the OM type optical disc, the optical recording film is formed of a reflective film such as an aluminum film.

When a phase change film is formed as the above recording film, next, as shown in FIG.
Infrared light IR such as YAG laser light is condensed by L, and the irradiation position is moved in the radial direction while rotating the disk substrate 10, for example, so that the entire first optical recording layer 11 is irradiated. After being heated and melted, it is rapidly cooled to crystallize. This corresponds to the initialization process of the first optical recording layer 11.

On the other hand, the light-transmitting film 14 on which the concavo-convex pattern including the concave portions 14d to be the groove pattern or the pit pattern is transferred is formed by various methods described below. First, the first method is as shown in FIG.
As shown in (a), for example, the light-transmissive film sheet 14s is placed on the light-transmissive film stamper 21 having a concavo-convex pattern including the convex portions 21p, and heated as shown in FIG. 4 (b). Press (PR) while TH). At this time, the surface of the light transmissive film sheet 14s is heated and melted, and is deformed along the concavo-convex pattern of the light transmissive film stamper 21. By rapidly cooling in this state, the light transmissive film 14 is formed. Next, FIG. 4 (c)
As shown in, when the mold is released from the light transmissive film stamper 21, the surface of the obtained light transmissive film 14 is
A concave portion (groove) 14d is transferred to a position corresponding to the convex portion 21p of the light transmissive film stamper 21.

As a second method, as shown in FIG. 5 (a), for example, an ultraviolet curable resin 14r is applied on a light-transmitting film stamper 21 having a concavo-convex pattern including a convex portion 21p. Then, as shown in FIG. 5B, the light-transmissive film sheet 14s is arranged on the upper layer thereof. As shown in FIG. 5 (c), an ultraviolet curable resin is applied to the gap between the light-transmitting film stamper 21 and the light-transmitting film sheet 14 s by a spin coating method of rotating in this state so that a uniform film thickness is obtained. Spread 14r. Next, as shown in FIG. 6A, the UV curable resin 14r is irradiated with UV rays to cure the UV curable resin 14r, and the light transmissive film sheet 14s and the UV curable resin 14r are integrated with each other to form the light transmissive film 14r. To form. Next, as shown in FIG. 6B, the light-transmitting film stamper 2 is used.
When the mold is released from the mold 1, the projections 21p of the light-transmitting film stamper 21 are formed on the surface of the obtained light-transmitting film 14.
The recessed portion (groove) 14d is transferred to the position corresponding to.

As a third method, as shown in FIG. 7 (a), the ultraviolet curable resin 14r is supplied onto the light transmissive film stamper 21 having a concavo-convex pattern including convex portions 21p, for example. By the spin coating method of rotating in this state, as shown in FIG. 7B, the ultraviolet curable resin 14r is applied with a uniform film thickness. Next, FIG. 8 (a)
As shown in FIG. 3, ultraviolet light UV is irradiated to cure the ultraviolet curable resin 14r to form the light transmissive film 14. Next, as shown in FIG. 8B, when the mold is released from the light transmissive film stamper 21, the surface of the obtained light transmissive film 14 is provided with the light transmissive film stamper 21.
The concave portion (groove) 14d is transferred to a position corresponding to the convex portion 21p.

Next, as shown in FIG. 9 (a), the surface of the light-transmissive film 14 formed as described above opposite to the surface on which the concavities and convexities are formed is attached to an adhesive layer such as an adhesive or a pressure-sensitive adhesive. It is attached to the support substrate 22 made of polycarbonate or other material by 23.

Next, as shown in FIG. 9B, with the light transmissive film 14 bonded to the support substrate 22, a gas such as air or nitrogen gas is blown onto the surface of the light transmissive film 14. After removing the dust, the second optical recording film 13 having a laminated body of a dielectric film, a recording film, a dielectric film, and a semi-transmissive reflective film is formed in this order by, for example, a sputtering method. As the recording film, for example, a phase change type optical recording film, a magneto-optical recording film, or a recording film containing an organic dye can be used. Alternatively, in the case of a ROM type optical disc, the optical recording film is formed of a semi-transmissive reflective film such as an aluminum film.

When a phase change film is formed as the above recording film, as shown in FIG. 10 (a), infrared rays are radiated by the objective lens OL in the same manner as in the case of the above first optical recording layer. The light IR is condensed and applied to the second optical recording layer 13, and heat is applied to melt it, followed by rapid cooling and crystallization. This corresponds to the initialization process of the second optical recording layer 13.

Next, as shown in FIG. 10B, by peeling at the interface between the adhesive layer 23 and the light transmissive film 14,
Light-transmissive film 14 having second optical recording layer 13 formed thereon
To get As described above, the adhesive layer 23 and the light transmissive film 1
In order to enable peeling at the interface of No. 4, the adhesive strength between the adhesive layer 23 and the light-transmissive film 14 is weaker than the adhesive strength between the adhesive layer 23 and the support substrate 22 in terms of adhesion by the adhesive layer 23. Keep it. Due to this difference in adhesive strength,
Peeling is possible at the interface between the adhesive layer 23 and the light transmissive film 14.

For example, when an adhesive is used as the adhesive layer 23, as shown in FIG. 11 (a), the light transmissive film 14 and the support substrate 22 are selected from different materials, so that the adhesive strength is different. It becomes possible to have. Also,
As shown in FIG. 11B, the support substrate 22 and the adhesive layer 23
There is a method in which the surface treatment FT is performed on either one of the interface with and the interface between the light transmissive film 14 and the adhesive layer 22.
The surface treatment includes, for example, a method of chemically treating a primer or silicone, or a method of increasing mechanical adhesion strength by a physical treatment such as roughening the surface. Further, by utilizing the fact that the adhesive strengths of the adhesives to the members having different rigidity are generally different, as shown in FIG. It is also possible to make the adhesive strength between the transparent film 14 and the transparent film 14 weaker.

Also, for example, when a pressure sensitive adhesive is used as the adhesive layer 23, by selecting the light transmissive film 14 and the support substrate 22 from different materials, as shown in FIG. It is possible to give different adhesive strengths. Further, as shown in FIG. 12B, there is a method of applying the surface treatment FT to either one of the interface between the support substrate 22 and the adhesive layer 23 and the interface between the light transmissive film 14 and the adhesive layer 22. The surface treatment includes, for example, a method of chemically treating a primer or silicone, or a method of increasing mechanical adhesion strength by a physical treatment such as roughening the surface. In addition, as shown in FIG. 13 (a), two of the weak adhesive layer 23a and the strong adhesive layer 23b are used.
By forming the adhesive layer 23 from the layers, it becomes possible to give different adhesive strengths. Further, as shown in FIG. 13B, a pressure-sensitive adhesive sheet in which a weak pressure-sensitive adhesive layer 23a is provided on one surface of a substrate 23c and a strong pressure-sensitive adhesive layer 23b is provided on the other surface can be used as an adhesive layer. .

Next, the first optical recording layer 11 formed on the disk substrate 10 and the second optical recording layer 13 formed on the light transmissive film 14 are bonded together by the adhesive layer 12. As the adhesive layer 12, for example, an ultraviolet curable resin adhesive or a pressure sensitive adhesive can be used.

As shown in FIG. 14A, the release sheet 1
When using the pressure-sensitive adhesive sheet 12s having 2a,
For example, the first optical recording layer 11 formed on the disc substrate 10
The pressure-sensitive adhesive sheet 12s is pressed onto the top and pressed by a pad or a roller to bond the first optical recording layer 11 and the pressure-sensitive adhesive sheet 12s as shown in FIG. 14 (b). Next, as shown in FIG. 14C, the release sheet 1
2a is peeled off, and as shown in FIG. 15A, the second optical recording layer 13 formed on the light transmissive film 14 is used as the pressure-sensitive adhesive sheet 12s, and the first optical recording layer 11 and the second optical recording layer 13 are formed. 15 and are pressed against each other and pressed by a pad or a roller to bond the first optical recording layer 11 and the second optical recording layer 13 together as shown in FIG. 15B. As described above, an optical disc having the two optical recording layers having the structure shown in FIG. 1 can be manufactured.

In the above, the pressure-sensitive adhesive sheet 12s
Is first adhered to the first optical recording layer 11 and then to the second optical recording layer 13, but conversely, the second optical recording layer 1
It is also possible to adhere to No. 3 and then to the first optical recording layer 11.

Here, the first optical recording layer 11 and the second optical recording layer
Since the signal portion of each recording layer must be attached to the optical recording layer 13 without eccentricity, it is important to attach them as follows, for example. For example, the light transmissive film 14 having the second optical recording layer 13 formed thereon is placed on an XY stage and held by vacuum or electrostatic adsorption. Next, the CCD cameras are arranged on the outer circumference or the inner circumference of the light-transmitting film 14 on the circumference which is the boundary between the signal portion and the mirror portion, at positions equally distributed at 90 °, and the boundary is subjected to edge detection. Based on the edge position information, the XY stage is moved so that the center pin comes to the center of the signal section. Next, the disk substrate 10 provided with the first optical recording layer 11 is fitted to the center pin and pressure-bonded with a pad or the like. As described above, the signal portions of the first optical recording layer 11 and the second optical recording layer 13 can be bonded together without eccentricity.

Further, the first optical recording layer 1 is placed on the XY stage.
1 is held, the XY stage is moved so that the center pin comes to the center of the signal portion, the light-transmissive film 14 having the second optical recording layer 13 is fitted to the center pin, a pad, etc. It is also possible to crimp.

Further, an ultraviolet curable resin adhesive or the like may be used to attach the first optical recording layer 11 and the second optical recording layer 13 described above. In this case,
As shown in FIG. 6A, for example, the ultraviolet curable resin 12r is formed on the first optical recording layer 11 formed on the disc substrate 10.
Is supplied by coating or the like, and as shown in FIG.
The light transmissive film 14 is disposed with the second optical recording layer 13 side facing the ultraviolet curable resin 12r side. As shown in FIG. 16C, the UV curable resin 12r is applied to the gap between the first optical recording layer 11 and the second optical recording layer 13 by a spin coating method of rotating in this state so that a uniform film thickness is obtained. Spread. Next, as shown in FIG. 17A, ultraviolet UV
Is irradiated to cure the ultraviolet curable resin 12r, and as the adhesive layer 12, the first optical recording layer 11 and the second optical recording layer 13 are bonded together as shown in FIG. 17 (b). As described above, an optical disc having the two optical recording layers having the structure shown in FIG. 1 can be manufactured.

In this case, the first optical recording layer 11 described above is used.
In order to bond the signal parts of the respective recording layers with the second optical recording layer 13 without eccentricity, as described above, the light transmissive film 14 provided with the second optical recording layer 13 is held on the XY stage, The XY stage is moved so that the center pin is located at the center of the signal portion, and spin coating is performed with the disk substrate 10 having the first optical recording layer 11 fitted on the center pin, and the center of the light-transmitting film. There is a method in which the holes are punched out concentrically with respect to the signal portion of the second optical recording layer 13 and the center position is aligned with a tapered center jig as a guide.

In the present embodiment, when the recording film is a phase change film, the initialization may be performed after laminating two optical recording layers, but the amount of light necessary for initializing the lower optical recording layer is set. However, since the two recording layers are close to each other, there is a problem that the influence of interference cannot be avoided. Therefore, it is preferable to perform initialization immediately after film formation as in the above-described embodiment.

According to the above-described method for manufacturing an optical disc having two optical recording layers according to the present embodiment, the second optical recording layer is formed with the light transmissive film bonded to the supporting substrate, and further, In the case of a phase change film, initialization is performed, and by attaching it to a rigid support substrate, the handling of a thin light-transmitting film is improved, and it becomes easier to hold it in the device. The light irradiating device can be of a normal structure. Further, since the back surface of the light-transmissive film is protected and does not need to come into direct contact with the stage in the apparatus, it is possible to suppress dust and scratches on the light-transmissive film. Furthermore, since dust does not adhere, a part of the light-transmissive film does not float on the stage due to dust, and it is possible to solve the problem that initialization is difficult in the case of a phase change layer.

Second Embodiment The structure of the optical disc according to the present embodiment is substantially the same as that of the first embodiment, and the manufacturing method is partially different. That is, as shown in FIG. 3C, a disc substrate 10 having a concave-convex pattern including a concave portion 10d to be a groove pattern or a pit pattern is formed on the surface, and a first optical recording film 11 is formed. The steps up to the step of condensing infrared light and initializing the first optical recording layer 11 are performed in the same manner as in the first embodiment.

On the other hand, as shown in FIG. 10A, the concave portion 1 having a groove pattern or a pit pattern on the surface is formed.
A step of forming a light-transmitting film 14 on which a concavo-convex pattern including 4d is formed, forming a second optical recording film 13, and further condensing infrared light to initialize the second optical recording layer 13. Up to this, the same operation as in the first embodiment is performed.

Next, as shown in FIG. 18A, before peeling at the interface between the adhesive layer 23 and the light transmissive film 14, the first optical recording layer 11 and the light transmissive layer formed on the disk substrate 10 are transferred. The second optical recording layer 13 formed on the flexible film 14 is attached by the adhesive layer 12. As the adhesive layer 12, for example, an ultraviolet curable resin adhesive or a pressure sensitive adhesive can be used. The process when using an adhesive is similar to the process of the first embodiment shown in FIGS. 16 and 17,
The process of using the pressure sensitive adhesive can be performed in the same manner as the process of the first embodiment shown in FIGS. 14 and 15. In the above-mentioned bonding step, the signal portions of the respective recording layers of the first optical recording layer 11 and the second optical recording layer 13 are bonded without eccentricity, and therefore the bonding can be carried out as in the first embodiment.

Next, as shown in FIG. 18B, the adhesive layer 23 and the light-transmissive film 14 are separated at the interface. As described above, an optical disc having the two optical recording layers having the structure shown in FIG. 1 can be manufactured.

According to the method of manufacturing an optical disc having two optical recording layers according to the present embodiment, the optical recording layer is attached to the supporting substrate with the light transmissive film, as in the first embodiment. Film formation and further initialization,
The handling of thin light-transmissive films is improved,
Since the light-transmissive film does not have to be directly placed on the stage in the device, it is possible to prevent the light-transmissive film from being scratched,
Part of the light transmissive film does not float on the stage due to dust or the like, so that the problem that initialization is difficult in the case of a phase change layer can be solved.

Third Embodiment The structure of the optical disk according to the present embodiment is substantially the same as that of the first embodiment, and the manufacturing method is partially different. That is, as shown in FIG. 3C, a disc substrate 10 having a concave-convex pattern including a concave portion 10d to be a groove pattern or a pit pattern is formed on the surface by injection molding, for example, and a first optical recording film 11 is formed. The steps up to the step of forming the film and further condensing infrared light to initialize the first optical recording layer 11 are performed in the same manner as in the first embodiment.

On the other hand, similarly to the step shown in FIG. 4, the light-transmitting film 14 having the concave-convex pattern including the concave portions 14d to be the groove pattern or the pit pattern is formed on the surface. Here, as shown in FIG. 19A, a protect film 14t is provided on the surface of the light transmissive film 14 opposite to the concavo-convex forming surface. For example, the light-transmissive film 14 having the protect film 14t provided on one surface in advance can be used, and the stamper having irregularities on the other surface can be pressed and heated to be formed. As the light-transmitting film 14 provided with the protect film 14t, for example, the surface of which is treated with a chemical such as butyl acetate and then laminated with polyethylene film, or a PET (polyethylene terephthalate) film having a slightly tacky feeling. For example, a pressure-sensitive adhesive may be attached. In the same manner as in the method described in the first embodiment, after forming the light-transmitting film 14 on the surface of which the concave-convex pattern including the concave portions 14d to be the groove pattern or the pit pattern is formed, the surface opposite to the concave-convex pattern forming surface is formed. A protective film may be attached to the side surface.

Next, as shown in FIG. 19B, the surface of the protect film 14t provided on the light transmissive film 14 formed as described above is covered with an adhesive layer such as an adhesive or a pressure sensitive adhesive. It is attached to the support substrate 22 made of polycarbonate or other material by 23.

Next, as shown in FIG. 19C, the protect film 14t provided on the light transmissive film 14 is provided.
In a state where the film is attached to the support substrate 22, a gas such as air or nitrogen gas is blown onto the surface of the light transmissive film 14 to remove dust, and then the dielectric film, the recording film, or the dielectric film is formed by, for example, a sputtering method. The second optical recording film 13 having a laminated body of a film and a semi-transmissive reflective film is formed in this order. As the recording film, for example, a phase change type optical recording film, a magneto-optical recording film, or a recording film containing an organic dye can be used. Alternatively, in the case of a ROM type optical disc, the optical recording film is formed of a semi-transmissive reflective film such as an aluminum film.

When a phase change film is formed as the above recording film, as shown in FIG. 20A, the infrared light IR is condensed by the objective lens OL and the second optical recording layer 13 is irradiated with the infrared light IR. Then, heat is applied to melt it, and then it is rapidly cooled to crystallize.
This corresponds to the initialization process of the second optical recording layer 13.

Next, as shown in FIG. 20 (b), the protective film 14t and the transparent film 14 are peeled off at the interface to obtain the transparent film 14 having the second optical recording layer 13 formed thereon. . As the subsequent steps, the first optical recording layer 11 formed on the disk substrate 10 and the second optical recording layer 13 formed on the light transmissive film 14 are bonded together by the adhesive layer 12 as in the first embodiment. . As the adhesive layer 12, for example, an ultraviolet curable resin adhesive or a pressure sensitive adhesive can be used. The process when using an adhesive is similar to the process of the first embodiment shown in FIGS. 16 and 17, and the process when using a pressure sensitive adhesive is shown in FIG.
It can be performed in the same manner as the steps of the first embodiment shown in FIGS. In the above-mentioned bonding step, the signal portions of the respective recording layers of the first optical recording layer 11 and the second optical recording layer 13 are bonded without eccentricity, and therefore the bonding can be carried out as in the first embodiment.

In the present embodiment, the adhesive strength at the interface between the protect film 14t and the light transmissive film 14 is weaker than that at the interface between the adhesive layer 23 and the support substrate 22 and the interface between the adhesive layer 23 and the protect film 14t. Need to be In this method, the protect film is peeled off at the same time as the supporting substrate, so that the step for peeling the protect film is unnecessary, and the number of steps can be reduced.

According to the method for manufacturing an optical disc having the two optical recording layers according to the present embodiment, the optical recording layer is attached to the supporting substrate with the light transmissive film as in the first embodiment. Film formation and further initialization,
The handling of thin light-transmissive films is improved,
Since the light-transmissive film does not have to be directly placed on the stage in the device, it is possible to prevent the light-transmissive film from being scratched,
In particular, the light-transmissive film is protected until the protect film is peeled off, which has an advantage that scratches and dust are not easily attached. Further, since part of the light transmissive film does not float on the stage due to dust or the like, it is possible to solve the problem that initialization is difficult in the case of a phase change layer. Further, since it suffices that the support substrate and the protect film can be attached to each other, the range of material selection for the support substrate is widened.

Fourth Embodiment The structure of the optical disk according to the present embodiment is substantially the same as that of the first embodiment, and the manufacturing method is partially different. That is, like the third embodiment, this is a method of providing the protect film 14t on the surface of the light transmissive film 14 opposite to the concavo-convex forming surface, and some steps are different from the third embodiment. That is, as shown in FIG. 3C, a disc substrate 10 having a concave-convex pattern including a concave portion 10d to be a groove pattern or a pit pattern is formed on the surface by injection molding, for example, and a first optical recording film 11 is formed. The steps up to the step of forming the film and further condensing infrared light to initialize the first optical recording layer 11 are performed in the same manner as in the first embodiment.

On the other hand, as shown in FIG. 19, a light-transmissive film 14 having a concave-convex pattern including concave portions 14d which are groove patterns or pit patterns is formed on the surface, and a second optical recording film 13 is formed. , Up to the step of further condensing infrared light to initialize the second optical recording layer 13,
The same operation as in the first embodiment is performed. On the other hand, as shown in FIG. 19, the surface of the protect film 14t provided on the light-transmitting film 14 on which the concavo-convex pattern is formed is covered with polycarbonate or another material by an adhesive layer 23 such as an adhesive or a pressure-sensitive adhesive. After being attached to a support substrate 22 made of, for example, the second optical recording film 13 is formed,
When a phase change film is formed as a recording film included in the second optical recording film 13, the infrared light IR is condensed by the objective lens OL as shown in FIG. Layer 1
Irradiate No. 3 and apply heat to melt it, followed by rapid cooling for crystallization. This corresponds to the initialization process of the second optical recording layer 13.

Next, as shown in FIG. 21B, the second optical recording layer 13 is formed on one surface and the other surface is protected by peeling at the interface between the protect film 14t and the adhesive layer 23. The light transmissive film 14 protected by the film 14t is obtained.

Next, as shown in FIG. 22A, the first substrate formed on the disk substrate 10 in the same manner as the first embodiment.
Second layer formed on the optical recording layer 11 and the light transmissive film 14
The optical recording layer 13 and the optical recording layer 13 are bonded together by the adhesive layer 12. As the adhesive layer 12, for example, an ultraviolet curable resin adhesive or a pressure sensitive adhesive can be used. The above-mentioned adhesion process is performed from the light transmitting film 14 to the protect film 1.
It is performed before peeling 4t. The process when using an adhesive is similar to the process of the first embodiment shown in FIGS. 16 and 17,
The process of using the pressure sensitive adhesive can be performed in the same manner as the process of the first embodiment shown in FIGS. 14 and 15. In the above-mentioned bonding step, the signal portions of the respective recording layers of the first optical recording layer 11 and the second optical recording layer 13 are bonded without eccentricity, and therefore the bonding can be carried out as in the first embodiment.

Next, as shown in FIG. 22B, the protect film 14t is peeled off from the light transmissive film 14. As described above, an optical disc having the two optical recording layers having the structure shown in FIG. 1 can be manufactured.

In the present embodiment, the adhesive strength at the interface between the adhesive layer 23 and the protect film 14t is weaker than that at the interface between the adhesive layer 23 and the support substrate 22 and the interface between the protect film 14t and the light transmissive film 14. Need to be In this method, since the first optical recording layer 11 formed on the disk substrate 10 and the second optical recording layer 13 formed on the light-transmissive film 14 are bonded together by the adhesive layer 12, the protect film 14t is peeled off. The light-transmitting film 14 can be protected by the protect film 14t until just before the completion, and the light-transmitting film 14 can be prevented from being dusted or scratched.

According to the method of manufacturing an optical disc having the two optical recording layers according to the present embodiment, the optical recording layer with the light transmissive film bonded to the supporting substrate is formed as in the first embodiment. Film formation and further initialization,
The handling of thin light-transmissive films is improved,
Since the light-transmissive film does not have to be directly placed on the stage in the device, it is possible to prevent the light-transmissive film from being scratched,
Part of the light transmissive film does not float on the stage due to dust or the like, so that the problem that initialization is difficult in the case of a phase change layer can be solved. Further, since it suffices that the support substrate and the protect film can be attached to each other, the range of material selection for the support substrate is widened.

Fifth Embodiment The structure of the optical disk according to the present embodiment is substantially the same as that of the first embodiment, and the manufacturing method is partially different. That is, like the third embodiment, this is a method of providing the protect film 14t on the surface of the light transmissive film 14 opposite to the concavo-convex forming surface, and some steps are different from the third embodiment. That is, as shown in FIG. 3C, a disc substrate 10 having a concave-convex pattern including a concave portion 10d to be a groove pattern or a pit pattern is formed on the surface by injection molding, for example, and a first optical recording film 11 is formed. The steps up to the step of forming the film and further condensing infrared light to initialize the first optical recording layer 11 are performed in the same manner as in the first embodiment.

On the other hand, as shown in FIGS. 19 and 20,
The surface of the protect film 14t provided on the light-transmitting film 14 on which the concavo-convex pattern is formed is covered with an adhesive layer 23 such as an adhesive or a pressure-sensitive adhesive to form a support substrate 22 made of polycarbonate or another material.
The process is similar to that of the third embodiment up to the step of laminating the second optical recording film 13, forming the second optical recording film 13, and further concentrating infrared light to initialize the second optical recording layer 13.

Next, as shown in FIG. 23A, the first optical recording layer 11 formed on the disk substrate 10 and the second optical recording layer 13 formed on the light transmissive film 14 are bonded to each other by the adhesive layer 12. Stick together. As the adhesive layer 12, for example, an ultraviolet curable resin adhesive or a pressure sensitive adhesive can be used. The process when using an adhesive is shown in FIG.
Similar to the steps of the first embodiment shown in FIGS. 16 and 17, the step of using the pressure-sensitive adhesive can be performed in the same manner as the steps of the first embodiment shown in FIGS. 14 and 15. In the above-mentioned bonding step, the signal portions of the respective recording layers of the first optical recording layer 11 and the second optical recording layer 13 are bonded without eccentricity, and therefore the bonding can be carried out as in the first embodiment.

Next, as shown in FIG. 23 (b), the protective film 14t and the light transmissive film 14 are separated at the interface. As described above, an optical disc having the two optical recording layers having the structure shown in FIG. 1 can be manufactured.

In the present embodiment, the adhesive strength at the interface between the protect film 14t and the light transmissive film 14 is weaker than at the interface between the adhesive layer 23 and the support substrate 22 and the interface between the adhesive layer 23 and the protect film 14t. There is a need. In this method, the protect film is peeled off at the same time as the supporting substrate, so that the step for peeling the protect film is unnecessary, and the number of steps can be reduced. In addition, after the first optical recording layer 11 formed on the disk substrate 10 and the second optical recording layer 13 formed on the light transmissive film 14 are bonded to each other by the adhesive layer 12, the protect film 14t is peeled off. The light-transmitting film 14 can be protected by the protect film 14t until immediately before, and the light-transmitting film 14 can be prevented from being dusted or scratched.

According to the method of manufacturing an optical disc having two optical recording layers according to the present embodiment, the optical recording layer is attached to the supporting substrate with the light transmissive film as in the first embodiment. Film formation and further initialization,
The handling of thin light-transmissive films is improved,
Since the light-transmissive film does not have to be directly placed on the stage in the device, it is possible to prevent the light-transmissive film from being scratched,
Part of the light transmissive film does not float on the stage due to dust or the like, so that the problem that initialization is difficult in the case of a phase change layer can be solved. Further, since it suffices that the support substrate and the protect film can be attached to each other, the range of material selection for the support substrate is widened.

Sixth Embodiment FIG. 24 is a sectional view of an optical disc according to this embodiment. Substantially the same as the optical disc according to the first embodiment, except that the hard coat layer 1 is formed on the surface of the light transmissive film 14.
5 is different. Hard coat layer 15
Thus, the surface of the light transmissive film 14 is less likely to be damaged.

The optical disk according to this embodiment can be manufactured substantially in the same manner as in the first embodiment. That is, as shown in FIG. 3C, a disc substrate 10 having a concave-convex pattern including a concave portion 10d to be a groove pattern or a pit pattern is formed on the surface by injection molding, for example, and a first optical recording film 11 is formed. The steps up to the step of forming the film and further condensing infrared light to initialize the first optical recording layer 11 are performed in the same manner as in the first embodiment.

On the other hand, as shown in FIGS. 4 to 8, concave portions 14 having a groove pattern or a pit pattern are formed on the surface.
Light-transmissive film 1 on which an uneven pattern including d is transferred
The steps up to the step of forming 4 are performed in the same manner as in the first embodiment. Next, as shown in FIG. 25 (a), the surface of the light-transmitting film 14 formed as described above opposite to the concavo-convex forming surface is coated with a polycarbonate or an adhesive layer 23 functioning as a hard coat layer 15. It is attached to the support substrate 22 made of other material or the like.

Next, as shown in FIG. 25B, with the light transmissive film 14 bonded to the support substrate 22,
A gas such as air or nitrogen gas is blown onto the surface of the light-transmissive film 14 to remove dust, and then the second optical recording film 13 is formed in this order by, for example, a sputtering method.

When a phase change film is formed as the recording film included in the second optical recording film 13, the same as in the case of the first optical recording layer described above, as shown in FIG. By the method, the infrared light IR is condensed by the objective lens OL, irradiated onto the second optical recording layer 13, heated and melted, and then rapidly cooled to be crystallized. This corresponds to the initialization process of the second optical recording layer 13.

Next, as shown in FIG. 26B, the second optical recording layer 13 and the hard coat layer 15 are formed by peeling at the interface between the hard coat layer 15 (adhesion layer 23) and the supporting substrate 22. The transparent film 14 thus obtained is obtained. In the present embodiment, for example, a substrate having poor adhesiveness is used as the support substrate 22, or silicone or the like is applied to the support substrate, so that the hard coat layer 15 and the light transmissive film 14 are harder than the interface. The adhesive strength at the interface between the layer 15 and the support substrate 22 is set to be weak.

In the subsequent steps, the first optical recording layer 11 formed on the disc substrate 10 and the second optical recording layer 13 formed on the light transmissive film 14 are bonded together by the adhesive layer 12. As the adhesive layer 12, for example, an ultraviolet curable resin adhesive or a pressure sensitive adhesive can be used. The process when using an adhesive is the same as the process of the first embodiment shown in FIGS. 16 and 17, and the process when using a pressure sensitive adhesive is the same as the process of the first embodiment shown in FIGS. 14 and 15. be able to. In the above-mentioned bonding step, the signal portions of the respective recording layers of the first optical recording layer 11 and the second optical recording layer 13 are bonded without eccentricity, and therefore the bonding can be carried out as in the first embodiment. With the above, FIG.
It is possible to manufacture an optical disc having two optical recording layers having the structure shown in FIG.

According to the method of manufacturing an optical disc having two optical recording layers according to the present embodiment, the optical recording layer is attached to the support substrate with the light transmissive film, as in the first embodiment. Film formation and further initialization,
The handling of thin light-transmissive films is improved,
Since the light-transmissive film does not have to be directly placed on the stage in the device, it is possible to prevent the light-transmissive film from being scratched,
Part of the light transmissive film does not float on the stage due to dust or the like, so that the problem that initialization is difficult in the case of a phase change layer can be solved. Further, since the adhesive layer is used as the hard coat layer, the number of steps for forming the hard coat layer can be reduced.

Seventh Embodiment The structure of the optical disk according to the present embodiment is substantially the same as that of the sixth embodiment, and the manufacturing method is partially different. That is, like the sixth embodiment, this is a method in which the hard coat layer 15 is provided on the surface of the light transmissive film 14 opposite to the concavo-convex forming surface, and some steps are different from the third embodiment. That is, as shown in FIG. 3C, a disc substrate 10 having a concave-convex pattern including a concave portion 10d to be a groove pattern or a pit pattern is formed on the surface by injection molding, for example, and a first optical recording film 11 is formed. The steps up to the step of forming the film and further condensing infrared light to initialize the first optical recording layer 11 are performed in the same manner as in the first embodiment.

On the other hand, as shown in FIG. 26 (a), the surface of the light-transmissive film 14 on which the concavo-convex pattern is formed is supported by the adhesive layer 23 functioning as a hard coat layer and made of polycarbonate or other material. The same steps as in the sixth embodiment are performed up to the step of laminating the second optical recording film 13 on the substrate 22, forming the second optical recording film 13, and condensing infrared light to initialize the second optical recording layer 13.

Next, as shown in FIG. 27A, the first optical recording layer 11 formed on the disk substrate 10 and the second optical recording layer 13 formed on the light transmissive film 14 are bonded to each other by the adhesive layer 12. Stick together. As the adhesive layer 12, for example, an ultraviolet curable resin adhesive or a pressure sensitive adhesive can be used. The process when using an adhesive is shown in FIG.
Similar to the steps of the first embodiment shown in FIGS. 16 and 17, the step of using the pressure-sensitive adhesive can be performed in the same manner as the steps of the first embodiment shown in FIGS. 14 and 15. In the above-mentioned bonding step, the signal portions of the respective recording layers of the first optical recording layer 11 and the second optical recording layer 13 are bonded without eccentricity, and therefore the bonding can be carried out as in the first embodiment.

Next, as shown in FIG. 27B, the support substrate 22 and the hard coat layer 15 are separated at the interface. As described above, an optical disc having two optical recording layers having the structure shown in FIG. 24 can be manufactured.

In this embodiment, for example, the support substrate 2
By using a substrate having poor adhesiveness as 2 or applying silicone or the like to the support substrate, the interface between the hard coat layer 15 and the support substrate 22 is larger than the interface between the hard coat layer 15 and the light transmissive film 14. Make sure the adhesive strength is weak.

According to the method for manufacturing an optical disc having the two optical recording layers according to the present embodiment, the optical recording layer is attached in the state where the light transmissive film is bonded to the supporting substrate, as in the first embodiment. Film formation and further initialization,
The handling of thin light-transmissive films is improved,
Since the light-transmissive film does not have to be directly placed on the stage in the device, it is possible to prevent the light-transmissive film from being scratched,
Part of the light transmissive film does not float on the stage due to dust or the like, so that the problem that initialization is difficult in the case of a phase change layer can be solved. Further, since the adhesive layer is used as the hard coat layer, the number of steps for forming the hard coat layer can be reduced.

Eighth Embodiment This embodiment shows a modification of the steps of attaching the light-transmissive film to the support substrate in the first to seventh embodiments. That is, as shown in FIG. 28A, the light-transmitting film stamper 2 having a concavo-convex pattern including a convex portion 21p.
1. A light-transmitting film 14 on which a concavo-convex pattern including recesses 14d to be a groove pattern or a pit pattern was transferred is formed on the surface 1, and the obtained light-transmitting film 14 is separated from the light-transmitting film stamper 21. Before the molding step, the support substrate 2 is provided on the surface opposite to the stamper 21.
2 are bonded together by the adhesive layer 23. Next, FIG.
As shown in (b), the light-transmissive film 14 and the light-transmissive film stamper 21 are peeled off at the interface and released.
The light-transmissive film bonded to the obtained supporting substrate is directly advanced to the film forming step of the second optical recording layer,
After that, the respective steps of the first to seventh embodiments are performed. The optical disc manufacturing method of the present embodiment has an advantage of eliminating the step of handling the light transmissive film in the form of a film having poor handleability.

Ninth Embodiment This embodiment shows a modification of the method for adjusting the eccentricity in the eighth embodiment. The eccentricity of the signal portion of the optical recording layer formed on the light-transmitting film obtained by transfer from the stamper and the center hole of the supporting substrate can be adjusted in advance. As the adjustment method, the signal parts such as the stamper are detected by using the CCD cameras arranged at the positions equally distributed at 90 ° on the circumference as described above, so that the center pin is not eccentric. Move the position such as stamper to. Alternatively, a center hole is opened in a stamper or the like, and the position of the center pin is determined with reference to this center hole.

For example, as shown in FIG. 29A, for example, the ultraviolet curable resin 14 is formed on the convex portion forming surface 29p 'of the stamper 29 arranged on the stage 30 as described above.
r is supplied, the light-transmissive film sheet 14s is placed, and the ultraviolet curable resin 14r is spread in the gap between the stamper 21 and the light-transmissive film sheet 14s by a spin coating method, and ultraviolet rays are irradiated. The light transmissive film 14 in which the ultraviolet curable resin 14r and the light transmissive film sheet 14s are integrated is formed. At this time, the center pin 31 for alignment having the outer diameter φ ₃₁ is arranged in accordance with the center hole CH of the stamper 21, and the light transmissive film sheet 14s obtained by punching out the center holes having the same inner diameter is aligned, The light transmissive film 14 is formed as described above.

Next, the center hole CH of the stamper 21
Center pin 32 for alignment of outer diameter φ ₃₂ according to
The pressure sensitive adhesive 23 is provided in advance on the support substrate 22 in which the center holes having the same inner diameter are punched out, and are aligned on the light transmissive film 14 so that there is no eccentricity with respect to the center pin. Press and stick together.

As described above, the supporting substrate can be attached to the signal portion such as the stamper without eccentricity, whereby the center hole of the supporting substrate and the center hole of the disk substrate can be aligned to each other to form the first optical recording layer. And the second optical recording layer can be bonded together without eccentricity.

Example 1 A polycarbonate optical disk substrate (thickness 1.1 mm, outer diameter 120 mm, center hole diameter 15 mm) having an uneven pattern of information pits formed on one surface was formed by injection molding. Next, aluminum was formed as the first reflective film to a thickness of 30 nm by sputtering.

On the other hand, a nickel stamper was formed into a disk shape (outer diameter 119 to 130 mm, center hole diameter 10 m).
m). Further, a 70 μm-thick polycarbonate film (manufactured by Teijin Ltd., Panlite) was punched into a ring shape (outer diameter 120 mm, inner diameter 22 mm). UV-curable resin (SD-3, manufactured by Nippon Ink Co., Ltd.) on the stamper.
01) is applied in a ring shape, a polycarbonate film is placed on the stamper using a cone-shaped center jig to align the centers, and spin coated at 5000 rpm for 20 seconds to spread the UV curable resin. Let Next, with a mercury lamp, 1000 mJ / cm ²
Irradiate the ultraviolet rays of the intensity of, to cure the ultraviolet curing resin,
The uneven shape provided on the stamper was transferred. Next, a light-transmitting film having an uneven pattern of information pits formed thereon was prepared by releasing from the stamper.

The light-transmissive film formed as described above is bonded with an adhesive to a supporting substrate of polycarbonate (thickness: 1.1 m).
m, outer diameter 122 mm, center hole 15 mm). When the outer diameter of the supporting substrate was not the same as that of the optical disc, it tended to be easier to get a trigger for peeling. A ring shape (outer diameter 119.8 mm, center hole 22.2 mm) is previously formed on the supporting substrate.
The pressure-sensitive adhesive with a release liner (9415C, manufactured by Sumitomo 3M Ltd.) punched in was pressed with a pressure pad to remove the release liner. Next, a light-transmissive film having an uneven pattern of information pits formed thereon was pressed by a pad and adhered onto a support substrate having a pressure-sensitive adhesive. At this time, the pressure-sensitive adhesive has a strong adhesion surface at the first adhesion,
At the time of peeling, the light-transmitting film side was peeled off. The outer diameter of the pressure-sensitive adhesive is the same as or smaller than the outer diameter of the light-transmissive film so that it does not protrude when pressed.
The center hole is also preferably the same as or larger than the center hole of the light transmissive film. Aluminum was formed as a semi-transmissive second reflective film with a film thickness of 10 nm by sputtering in a state of being attached to the supporting substrate. After the film formation was completed, the light transmissive film was peeled off from the supporting substrate.

Next, the semi-transmissive second reflective film of the light transmissive film and the first reflective film of the optical disk substrate were bonded together using a pressure sensitive adhesive as follows. That is, a pressure-sensitive adhesive with a release film (thickness: 25 μm, CS-9603 manufactured by Nitto Denko Corporation) was punched into a ring shape having an outer diameter of 119.5 mm and a center hole of 22.1 mm, and pressure-bonded onto the first reflective film of the optical disc substrate. The pieces were attached with a pad and the release film was removed. On the other hand, the light transmissive film having the second reflective film formed thereon is placed on a flat XY stage, and in this state, the position of the signal portion of the second reflective film is read by the CCD camera, and the center pin is at the center of the signal portion. The light-transmissive film on the stage was moved so that it came to. In this state,
Using the center pin as a guide, the optical disk substrate with the pressure sensitive adhesive was pressed by the pressure bonding pad and bonded.

(Example 2) In the same manner as in Example 1, an optical disk substrate having a pressure sensitive adhesive provided on the first reflective film was formed. On the other hand, after forming the semi-transmissive second reflective film on the light transmissive film in the same manner as in Example 1, the light transmissive film was placed on the XY stage without being peeled off from the supporting substrate. At this time, it is preferable that the center hole diameter of the supporting substrate is larger than 15 mm so that the center pin can move with respect to the supporting substrate, and smaller than the center hole diameter (22 mm) of the light transmissive film. ,
The diameter was set to 20 mm. The position of the signal portion of the second reflective film of the light transmissive film was detected, and the light transmissive film on the stage was moved together with the supporting substrate so that the center pin was located at the center of the signal portion. Next, the center pin was used as a guide to press the optical disk substrate with the pressure-sensitive adhesive with a pressure pad to bond them together. After the bonding, the supporting substrate and the light-transmissive film were peeled off at the interface between the pressure-sensitive adhesive and the adhesive. Since the pressure-sensitive adhesive that adheres the semi-transmissive second reflective film of the light-transmissive film and the first reflective film of the optical disk substrate has a strong adhesive force, the holding substrate and the light-transmissive film, which are weakly adhered, are It could be peeled off at the interface with the pressure-sensitive adhesive that had been adhered.

(Embodiment 3) As in Embodiment 1, as the light-transmitting film, a polycarbonate film having a PET film bonded beforehand with a slight adhesive as a protect film was used, and this was ring-shaped (outer diameter 120 m).
m, center hole 22 mm), an ultraviolet curable resin was applied on the stamper, a light transmissive film was placed on the stamper, and spin coating was performed. The obtained light-transmissive film to which the concavo-convex pattern was transferred was bonded onto a supporting substrate with a pad using a strong pressure-sensitive adhesive (CS-9603 manufactured by Nitto Denko Corporation). Next, a second reflective film was formed on the concavo-convex pattern of the light-transmitting film, and then peeled off at the interface between the slight adhesive of the protect film and the light-transmitting film. Finally, the eccentricity was adjusted in the same manner as in Example 1, and the second film of the light transmissive film was adjusted.
An optical disk substrate provided with a pressure-sensitive adhesive on the first reflective film, which was previously formed in the same manner as in Example 1, was attached to the reflective film.

(Example 4) As in Example 1, as the light-transmitting film, a polycarbonate film in which a PET film was previously bonded as a protect film via a slight adhesive was used, and this was ring-shaped (outer diameter 120 m).
m, center hole 22 mm), an ultraviolet curable resin was applied on the stamper, a light transmissive film was placed on the stamper, and spin coating was performed. Next, an ultraviolet curable resin was applied in a ring shape on the supporting substrate, and the light-transmitting film having the concavo-convex pattern obtained as described above was placed on the surface of the protect film and spin-coated. The resin was cured by UV irradiation and adhered. The adhesiveness between the UV curable resin and the PET film is
Since it is weaker in adhesiveness to the film, it was peeled off at the interface between the ultraviolet curable resin and the PET film during peeling. Furthermore, by applying silicone to the surface of the PET film, the adhesiveness could be further reduced. Next, a second reflective film was formed on the concavo-convex pattern of the light transmissive film, and then peeled off at the interface between the PET film of the protect film and the ultraviolet curable resin. Next, the eccentricity was adjusted in the same manner as in Example 1, and the first film formed in advance in the same manner as in Example 1 was formed on the second reflective film of the light transmissive film with the protect film attached. An optical disk substrate provided with a pressure-sensitive adhesive on the reflective film was attached. Finally, peel off at the interface between the light-transmissive film and the slight adhesive of the protect film,
The protect film was removed.

(Embodiment 5) As in Embodiment 1, as the light-transmitting film, a polycarbonate film, which was previously laminated with a PET film via a slight adhesive as a protect film, was used, and this was formed into a ring shape (outer diameter 120 m).
m, center hole 22 mm), an ultraviolet curable resin was applied on the stamper, a light transmissive film was placed on the stamper, and spin coating was performed. The obtained light-transmissive film to which the concavo-convex pattern was transferred was bonded onto a supporting substrate with a pad using a strong pressure-sensitive adhesive (CS-9603 manufactured by Nitto Denko Corporation). Next, a second reflective film was formed on the uneven pattern of the light transmissive film. Next, the eccentricity is adjusted in the same manner as in Example 1, and the pressure-sensitive adhesive is formed on the second reflective film of the light transmissive film and on the first reflective film previously formed in the same manner as in Example 1. The optical disk substrates provided with the agent were bonded together. Finally, it was peeled off at the interface between the light-transmissive film and the slight adhesive of the protect film.

(Example 6) As in Example 1, a polycarbonate film was used as the light-transmitting film, and this was formed into a ring shape (outer diameter 120 mm, center hole 22 m).
m), the UV-curable resin was applied onto the stamper, the light-transmissive film was placed on the stamper, and spin-coated. Cyclic polyolefin with poor adhesion (ZEO manufactured by Nippon Zeon Co., Ltd.
A hard coating agent (UR-4501 manufactured by Mitsubishi Rayon Co., Ltd.) is applied in a ring shape on a supporting substrate made of NEX,
The light-transmissive film having the concavo-convex pattern obtained above was transferred by spin coating. It was confirmed that when the film was peeled off after the film formation, it was peeled off at the interface between the supporting substrate and the hard coat agent. Next, a second reflective film was formed on the uneven pattern of the light transmissive film. Next, the eccentricity is adjusted in the same manner as in Example 1, and the pressure-sensitive adhesive is formed on the second reflective film of the light transmissive film and on the first reflective film previously formed in the same manner as in Example 1. The optical disk substrates provided with the agent were bonded together.
Finally, it was peeled off at the interface between the supporting substrate and the hard coat agent.

Example 7 A polycarbonate optical disk substrate (thickness 1.1 mm, outer diameter 120 mm, center hole diameter 15 mm) having an uneven pattern of information pits formed on one side was formed by injection molding. Next, aluminum was formed as the first reflective film to a thickness of 30 nm by sputtering.

On the other hand, a nickel stamper was formed into a disk shape (outer diameter 119 to 130 mm, center hole diameter 10 m).
m). Further, a 70 μm-thick polycarbonate film (manufactured by Teijin Ltd., Panlite) was punched into a ring shape (outer diameter 120 mm, inner diameter 22 mm). UV-curable resin (SD-3, manufactured by Nippon Ink Co., Ltd.) on the stamper.
01) is applied in a ring shape, a polycarbonate film is placed on the stamper using a cone-shaped center jig to align the centers, and spin coated at 5000 rpm for 20 seconds to spread the UV curable resin. Let Next, with a mercury lamp, 1000 mJ / cm ²
Irradiate the ultraviolet rays of the intensity of, to cure the ultraviolet curing resin,
The uneven shape provided on the stamper was transferred.

Next, the pressure-sensitive adhesive with a release liner was pressed onto the supporting substrate with a pressure-bonding pad to peel off the release liner. Next, a light-transmissive film having an uneven pattern of information pits formed thereon was pressed by a pad and adhered onto a support substrate having a pressure-sensitive adhesive. Next, it was possible to release the light transmissive film from the stamper and bond only the light transmissive film to the supporting substrate. After that, in the same manner as in Example 1 or Example 2, the semi-transmissive second reflective film is formed, and the semi-transmissive second reflective film of the light transmissive film and the first reflective film of the optical disk substrate are formed. By bonding and, an optical disk having a two-layer reflective film could be manufactured.

(Embodiment 8) A center hole having a diameter of 10 mm was punched out with reference to the signal portion of a nickel stamper for transferring a signal. The support substrate has an outer diameter of 120 mm,
A center hole having a diameter of 15 mm was used. The center pin has a diameter of 10 mm as a reference, and the upper part thereof has the same diameter as the center hole of the supporting substrate. First, an ultraviolet curable resin was applied in a ring shape to a nickel stamper, and a polycarbonate film punched into a ring shape (outer diameter 120 mm, center hole diameter 22 mm) was placed using a center jig. After spin coating, ultraviolet rays were irradiated to cure the ultraviolet curable resin. The support substrate has an outer diameter of 11
A pressure-sensitive adhesive with a release film punched in a ring shape with a diameter of 9.5 mm and a center hole diameter of 22.1 mm was bonded by pad pressure bonding, and the release film was removed.
Next, the above center pin was fitted into the center hole of the nickel stamper, and the support substrate with the adhesive was pressure-bonded with the pad using this pin as a reference. As described above, the support substrate could be attached to the signal portion of the stamper without eccentricity.

The present invention is not limited to the above embodiment. For example, the layer structure of the optical recording film is not limited to the structure described in the embodiment, and various structures can be used depending on the material of the recording film and the like. The optical recording film may have three or more layers. Further, in addition to the phase change type optical recording medium, it is also applicable to a magneto-optical recording medium and an optical disc medium using an organic dye material. It is also possible to use a spin coating method. Further, the present invention can be applied to a ROM type optical disc in which a reflection film such as aluminum is provided on the uneven shape which becomes the information pit. In addition, various modifications can be made without changing the gist of the present invention.

[0116]

According to the method for producing an optical recording medium of the present invention, when an optical recording medium having two or more optical recording layers is produced, the handling of a thin light-transmitting film is improved and the light transmitting property is improved. It is possible to prevent the film from being scratched, and to solve the problem that initialization is difficult especially in the case of a phase change layer.

[Brief description of drawings]

FIG. 1A is a schematic perspective view showing a state of light irradiation of an optical disc according to a first embodiment of the present invention.
1B is a schematic sectional view, and FIG. 1C is an enlarged sectional view of a main part of the schematic sectional view of FIG. 1B.

FIG. 2A is a schematic view and FIG. 2B is a sectional view showing an injection molding step of a disc substrate in a manufacturing process of the optical disc manufacturing method according to the first embodiment.

3 is a cross-sectional view showing a step that follows FIG. 2,
(A) shows up to the step of forming a disk substrate, (b) shows up to the step of forming a first optical recording film, and (c) shows up to the step of initializing the first optical recording film.

FIG. 4 is a cross-sectional view showing a step of forming a light-transmitting film having a concavo-convex pattern in the manufacturing process of the optical disc manufacturing method according to the first embodiment.

FIG. 5 is a cross-sectional view showing a step of forming a light-transmitting film having a concavo-convex pattern in the manufacturing process of the optical disc manufacturing method according to the first embodiment.

FIG. 6 is a cross-sectional view showing a step of forming a light-transmitting film having a concavo-convex pattern in the manufacturing process of the optical disc manufacturing method according to the first embodiment.

FIG. 7 is a cross-sectional view showing a step of forming a light-transmitting film having a concavo-convex pattern in the manufacturing process of the optical disc manufacturing method according to the first embodiment.

FIG. 8 is a cross-sectional view showing a step of forming a light-transmitting film having a concavo-convex pattern in the manufacturing process of the optical disc manufacturing method according to the first embodiment.

9A and 9B are cross-sectional views showing a manufacturing process of the optical disc manufacturing method according to the first embodiment, in which FIG. 9A is a process of attaching a light-transmissive film to a support substrate, and FIG. 9B is a light-transmissive film. The process up to the step of forming the second optical recording layer on the functional film will be described.

FIG. 10 is a cross-sectional view showing a step that follows FIG. 9, in which (a) is a step until the step of initializing the second optical recording layer,
(B) shows up to the step of peeling the light transmissive film from the supporting substrate.

FIG. 11 is a cross-sectional view illustrating the adhesive strength of an adhesive layer that bonds a light-transmitting film and a supporting substrate.

FIG. 12 is a cross-sectional view illustrating the adhesive strength of an adhesive layer that bonds a light-transmitting film and a supporting substrate.

FIG. 13 is a cross-sectional view illustrating the adhesive strength of an adhesive layer that adheres a light-transmitting film and a support substrate.

FIG. 14 is a cross-sectional view showing the manufacturing process of the method for manufacturing an optical disc according to the first embodiment, (a) up to the step of disposing a pressure-sensitive adhesive with a release sheet on the first optical recording layer. , (B) shows up to the step of pressing the pressure-sensitive adhesive with a release sheet onto the first optical recording layer, and (c) shows the step of releasing the release sheet.

15 is a cross-sectional view showing a step following that of FIG. 14, wherein (a) is a step of arranging a light-transmitting film on a pressure-sensitive adhesive, and (b) is a light-transmitting film. The process up to pressure bonding to the pressure-sensitive adhesive is shown.

FIG. 16 is a cross-sectional view showing the manufacturing process of the optical disc manufacturing method according to the first embodiment, and FIG. 16A is a process up to the step of supplying an ultraviolet curable resin adhesive onto the second optical recording layer; (B) shows up to the step of disposing the light transmissive film on the ultraviolet curable resin adhesive, and (c) shows up to the spin coating step.

FIG. 17 is a cross-sectional view showing a step following that of FIG. 16, in which (a) shows up to the step of irradiating with ultraviolet rays, and (b) shows the state in which the ultraviolet curable resin adhesive is solidified.

FIG. 18 is a cross-sectional view showing the manufacturing process of the method for manufacturing an optical disc according to the second embodiment, and FIG. 18 (a) is a second optical recording layer of a light transmissive film having a support substrate bonded thereto and a disc substrate. (B) shows up to the step of adhering the first optical recording layer to step (b) up to the step of peeling the supporting substrate from the light transmissive film.

FIG. 19 is a cross-sectional view showing the manufacturing process of the optical disc manufacturing method according to the third embodiment, (a) up to the process of forming a light-transmitting film with a protect film having an uneven pattern ( b) shows up to the step of adhering the light transmissive film to the supporting substrate, and (c) shows up to the step of forming the second optical recording layer on the light transmissive film.

FIG. 20 is a cross-sectional view showing a step that follows FIG. 19, in which (a) is a step until the step of initializing the second optical recording layer,
(B) shows up to the step of peeling at the interface between the light transmissive film and the protect film.

FIG. 21 is a cross-sectional view showing the manufacturing process of the optical disc manufacturing method according to the fourth embodiment, and FIG. 21 (a) is a light-transmitting film with a protect film having a concavo-convex pattern bonded to a support substrate. , Up to the step of initializing the second optical recording layer, and (b) shows up to the step of peeling at the interface between the protect film and the adhesive layer.

FIG. 22 is a cross-sectional view showing a step that follows FIG. 21, in which (a) is a second optical recording layer of a light-transmitting film with a protect film, which is attached to a first optical recording layer of a disk substrate. Up to the step, (b) shows up to the step of peeling off the protect film.

FIG. 23 is a cross-sectional view showing the manufacturing process of the optical disk manufacturing method according to the fifth embodiment, and FIG. 23 (a) is a light-transmitting film with a protect film having a concavo-convex pattern in which supporting substrates are bonded. Until the step of bonding the second optical recording layer and the first optical recording layer of the disc substrate,
(B) shows up to the step of peeling at the interface between the protect film and the light transmissive film.

FIG. 24 is a cross-sectional view of an optical disc according to a sixth embodiment of the present invention.

FIG. 25 is a cross-sectional view showing a manufacturing process of a method for manufacturing an optical disc according to a sixth embodiment, (a) is a process of bonding a light-transmissive film to a supporting substrate with a hard coating agent, ) Indicates up to the step of forming the second optical recording layer on the light transmissive film.

FIG. 26 is a cross-sectional view showing a step that follows FIG. 25, in which (a) is a step until the step of initializing the second optical recording layer,
(B) shows up to the step of peeling at the interface between the hard coat layer and the supporting substrate.

FIG. 27 is a cross-sectional view showing a manufacturing process of a method for manufacturing an optical disc according to a seventh embodiment, (a) of a light-transmitting film having a concavo-convex pattern in which a supporting substrate is bonded with a hard coating agent. Up to the step of bonding the second optical recording layer and the first optical recording layer of the disk substrate, (b) shows up to the step of peeling at the interface between the hard coat layer and the supporting substrate.

FIG. 28 is a cross-sectional view showing a manufacturing process of a method for manufacturing an optical disc according to an eighth embodiment, (a) is a process of adhering a supporting substrate to a light-transmitting film having a concavo-convex pattern, ) Indicates up to the step of releasing the light transmissive film from the stamper.

FIG. 29 is a cross-sectional view showing the manufacturing process of the optical disc manufacturing method according to the ninth embodiment, and FIG. 29 (a) is a diagram showing an ultraviolet curable resin supplied on a stamper having an uneven pattern,
The process up to the step of adhering the light transmissive film to the step (b) adhering the support substrate to the light transmissive film are shown.

FIG. 30 (a) is a schematic perspective view showing a state of light irradiation of an optical disc according to a conventional example, FIG. 30 (b) is a schematic sectional view, and FIG. It is sectional drawing which expanded the principal part of the schematic sectional view of b).

FIG. 31 is a cross-sectional view showing a manufacturing process of a method for manufacturing an optical disc according to a conventional example, (a) up to an injection molding process, and (b) forming a first optical recording layer on a disc substrate. (C) shows up to the step of initializing the first optical recording film.

FIG. 32 is a cross-sectional view showing a manufacturing process of a method for manufacturing an optical disc in a conventional example, (a) up to a process of forming a light-transmitting film having an uneven pattern,
(B) shows up to the step of releasing.

33 is a cross-sectional view showing a step that follows FIG. 32, wherein (a) and (b) are up to the step of placing the light-transmitting film in the sputtering apparatus, and (c) is the second optical method. The steps up to the step of forming the recording layer are shown.

34 is a cross-sectional view showing a step that follows FIG. 33, wherein (a) and (b) are up to the step of placing the light-transmitting film in the light irradiation device, and (c) is the second step. The steps up to the step of initializing the optical recording layer will be shown.

FIG. 35 is a cross-sectional view showing a step of adhering the second optical recording layer of the light transmissive film and the first optical recording layer of the disk substrate, which is a step following that of FIG. 34.

FIG. 36 is a sectional view for explaining the problems of the conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Disk substrate, 10d ... Recessed part, 11 ... 1st optical recording layer, 12 ... Adhesive layer, 12a ... Release sheet, 12s ... Pressure sensitive adhesive sheet, 13 ... 2nd optical recording layer, 14 ... Light transmissive film, 14d ... recesses, 14r ... UV curable resin,
14s ... Light-transmitting film sheet, 14t ... Protect film, 15 ... Hard coat layer, 20, 21 ... Stamper, 20p, 21p ... Convex portion, 21p '... Convex portion forming surface,
22 ... Support substrate, 23 ... Adhesive layer, 23a ... Weak adhesive layer,
23b ... Strong adhesive layer, 23c ... Substrate, 30 ... Stage 3
0, 31, 32 ... Center pin, 40, 42 ... Stage, 41 ... Jig, CH ... Center hole, DC ... Optical disc, DR ... Drive direction, DS ... Dust, FT ... Surface treatment, IR ... Infrared, LT ... Light , MD1, MD2 ... Mold,
MS ... injection port, OL ... objective lens, PR ... press, TH ...
Heating, UV ... ultraviolet rays.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Toshiyuki Kashiwagi             6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Soni             -Inside the corporation F term (reference) 5D121 AA07 DD05 DD06 EE26 FF01                       FF15 FF20

Claims (24)

[Claims] 1. A method of manufacturing an optical recording medium having at least two optical recording layers, comprising the step of forming a concavo-convex shape on one surface of a medium substrate; 1 a step of forming an optical recording layer, a step of forming an uneven shape on one surface of the light transmissive film, a step of forming a second optical recording layer on the uneven surface forming surface of the light transmissive film, Bonding the first optical recording layer and the second optical recording layer, and at least before the step of forming the second optical recording layer,
A step of adhering the light-transmissive film to a supporting substrate with an adhesive layer on the surface of the light-transmissive film opposite to the concavo-convex shape forming surface, and at least in the step of forming the second optical recording layer, A method for producing an optical recording medium, which comprises performing a process in which a light transmissive film is attached to the supporting substrate. 2. In the step of adhering the light transmissive film to the support substrate with an adhesive layer, the adhesive strength between the adhesive layer and the light transmissive film is higher than the adhesive strength between the adhesive layer and the support substrate. The method for producing an optical recording medium according to claim 1, wherein the optical recording medium and the optical recording medium are attached so as to become weaker. 3. The method for producing an optical recording medium according to claim 2, wherein an adhesive layer having different adhesive strength on one surface and adhesive strength on the other surface is used as the adhesive layer. 4. After the step of forming the second optical recording layer,
The optical recording medium according to claim 1, further comprising a step of peeling at the interface between the light transmissive film and the adhesive layer before the step of bonding the first optical recording layer and the second optical recording layer. Production method. 5. The step of attaching the first optical recording layer and the second optical recording layer is performed in a state where the light transmissive film is attached to the support substrate, and the first optical recording layer and the second optical recording layer are attached. The method of manufacturing an optical recording medium according to claim 1, further comprising a step of peeling at the interface between the light transmissive film and the adhesive layer after the step of attaching the second optical recording layer. 6. The light transmissive film is provided with a protect film on the surface opposite to the surface on which the uneven shape is formed, and in the step of adhering the light transmissive film and the supporting substrate, the light transmissive film is formed. The method for producing an optical recording medium according to claim 1, wherein the protect film provided on the protective film is attached to the supporting substrate via an adhesive layer. 7. After the step of forming the second optical recording layer,
7. The optical recording medium according to claim 6, further comprising a step of peeling at the interface between the light transmissive film and the protect film before the step of bonding the first optical recording layer and the second optical recording layer. Production method. 8. After the step of forming the second optical recording layer,
Before the step of bonding the first optical recording layer and the second optical recording layer, the method further comprises a step of peeling at the interface between the protect film and the adhesive layer, and the first optical recording layer and the second optical recording layer. 7. The method for producing an optical recording medium according to claim 6, further comprising a step of peeling at the interface between the light transmissive film and the protect film after the step of attaching the optical recording layer. 9. The step of attaching the first optical recording layer and the second optical recording layer is performed in a state where the protect film provided on the light transmissive film is attached to the supporting substrate, 7. The method further comprising a step of peeling at the interface between the light transmissive film and the protect film after the step of laminating the first optical recording layer and the second optical recording layer.
A method for manufacturing the optical recording medium according to. 10. The method for producing an optical recording medium according to claim 1, wherein a hard coat agent is used as the adhesive layer. 11. In the step of adhering the light transmissive film to the supporting substrate with an adhesive layer using a hard coating agent, the adhesive layer and the light transmitting layer are more strongly than the adhesive strength between the adhesive layer and the supporting substrate. The method for manufacturing an optical recording medium according to claim 10, wherein the optical recording medium and the optical film are attached so that the adhesive strength with the functional film is stronger. 12. The support substrate and the hard coat agent are applied after the step of forming the second optical recording layer and before the step of attaching the first optical recording layer and the second optical recording layer. The method for producing an optical recording medium according to claim 10, further comprising a step of peeling at the interface of the adhesive layer. 13. The step of attaching the first optical recording layer and the second optical recording layer is performed in a state where the light transmissive film is attached to the support substrate, and the first optical recording layer and the second optical recording layer are attached. The method for producing an optical recording medium according to claim 10, further comprising a step of peeling at the interface between the supporting substrate and the adhesive layer using the hard coating agent after the step of bonding the second optical recording layer. 14. A groove for partitioning a track region is formed in the step of forming an uneven shape on one surface of the medium substrate and the step of forming an uneven shape on one surface of the light transmissive film, The method for producing an optical recording medium according to claim 1, wherein a phase change type optical recording layer is formed as the first and second optical recording layers. 15. A first substrate is formed on the surface of the medium substrate on which unevenness is formed.
The step of forming the optical recording layer includes the initialization of the first optical recording layer, and the step of forming the second optical recording layer on the concave-convex shape forming surface of the light transmissive film is the second optical recording layer. 15. The method for manufacturing an optical recording medium according to claim 14, further comprising the initialization of. 16. A groove for partitioning a track region is formed in the step of forming an uneven shape on one surface of the medium substrate and the step of forming an uneven shape on one surface of the light transmissive film. The method of manufacturing an optical recording medium according to claim 1, wherein a magneto-optical recording type optical recording layer is formed as the first and second optical recording layers. 17. A groove for partitioning a track region is formed in the step of forming an uneven shape on one surface of the medium substrate and the step of forming an uneven shape on one surface of the light transmissive film, The method for producing an optical recording medium according to claim 1, wherein an optical recording layer containing an organic dye is formed as the first and second optical recording layers. 18. In the step of forming unevenness on one surface of the medium substrate and the step of forming unevenness on one surface of the light transmissive film, unevenness to be information pits is formed, The method for producing an optical recording medium according to claim 1, wherein reflective films are formed as the first and second optical recording layers. 19. The step of forming an uneven shape on one surface of a light-transmitting film, wherein a light-transmitting material is provided so that the uneven shape is transferred onto a stamper having the uneven shape formed thereon. The method for producing an optical recording medium according to claim 1, further comprising: a step of forming an optical recording medium; and a step of peeling the light transmissive film from the stamper. 20. After the step of forming a light-transmissive film by providing a light-transmissive material on the stamper on which the uneven shape is formed so as to transfer the uneven shape, the light-transmissive film is removed from the stamper. Before the peeling step, on the surface opposite to the concavo-convex shape forming surface of the light transmissive film,
20. The method for producing an optical recording medium according to claim 19, wherein the light transmissive film is attached to a supporting substrate with an adhesive layer. 21. In the step of adhering the light-transmissive film to a support substrate with an adhesive layer, the center hole provided in the support substrate and the center hole of the stamper are aligned using an eccentricity adjusting pin. 21. The method of manufacturing an optical recording medium according to claim 20, wherein the support substrate is attached with eccentricity adjustment with respect to the uneven shape of the light transmissive film. 22. In the step of forming a light-transmissive film by providing a light-transmissive material on the stamper having the concavo-convex shape formed thereon so as to transfer the concavo-convex shape, The method of manufacturing an optical recording medium according to claim 19, wherein the sheet is pressed while being heated. 23. In the step of forming a light-transmissive film by providing a light-transmissive material on the stamper on which the uneven shape is formed so as to transfer the uneven shape, a light-transmissive film for use on the stamper is formed. 20. The method for producing an optical recording medium according to claim 19, wherein the sheets are attached to each other with a light-transmissive film adhesive, and the light-transmissive film adhesive is solidified. 24. In the step of forming a light-transmissive film by providing a light-transmissive material on the stamper on which the uneven shape is formed so as to transfer the uneven shape, a light-transmissive film for the stamper is formed. The method for producing an optical recording medium according to claim 19, wherein a resin is applied to solidify the resin for a light transmissive film.