JP2003203402A - Method of manufacturing optical information recording medium and optical information recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a multilayered optical information recording medium which deals with the thickness reduction of recording and reproducing side substrates and an optical information recording medium. <P>SOLUTION: Sheet-like tacky adhesive material which consists of resin material and has high thickness accuracy is arranged on the substrate having an information recording layer and the resin material having high transferability is arranged thereon and further, a stamper is arranged thereon and is peeled, by which the multilayered structure can be formed. The variations in the thicknesses are decreased by using the sheet-like material. Two kinds of the functions are divided to two kinds of the resin materials and therefore the development of the materials is easy. <P>COPYRIGHT: (C)2003,JPO

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 information recording medium and an optical information recording medium, and more particularly to a method for manufacturing a multilayer optical information recording medium and a multilayer optical information recording medium.

[0002]

2. Description of the Related Art In recent years, various researches on optical information recording have been conducted in the field of information recording. This optical information recording is capable of high density, and recording / reproducing can be performed in a non-contact manner, and it is being applied to a wide range of purposes as a method that can be realized at low cost. An optical disc is a medium for recording this optical information. This optical disc can be roughly classified into a read-only type, a write-once type, and a rewritable type. The read-only type is a disc called a compact disc (CD) on which music information is recorded or a disc called a laser disc (LD) on which image information is recorded, and the write-once type is a document file or a still image file. As a rewritable type, the rewritable type is commercialized as a data file for a personal computer, etc., and is widely used in the world. These optical disks have a thickness of 1.
It has a structure in which an information layer is provided on a 2 mm transparent resin substrate and is protected by an overcoat, or a structure in which the information layer is provided on one or both of the 1.2 mm transparent resin substrates and the two are bonded together.

Further, in order to record not only audio but also moving images such as movies as information, a digital versatile disk (DVD) which is a larger capacity optical disk has been developed.
It has been commercialized and is already spreading. In order to realize a high-density optical disc such as a DVD, a system has been adopted in which an objective lens having a short laser wavelength and a large numerical aperture (NA) is used. However, the shortening of the wavelength and the increase in the NA are due to the tilt angle (tilt) of the disk with respect to the laser light input direction.
Decrease the allowable value of. To increase the tilt tolerance, it is effective to reduce the substrate thickness.
In D, the laser wavelength is 650 nm, the NA is 0.60, and the substrate thickness is 0.6 mm. Thickness 0.6 mm
Since the resin substrate of 1) has weak mechanical strength and causes tilt, the DVD has a structure in which two substrates are bonded with the information recording surface inside. Further, utilizing the bonding structure, one of the two substrates to be bonded has a translucent reflective layer such as gold or silicon on one information recording surface, and the other information recording surface has a conventional aluminum or the like. A two-sided single-sided reproducing layer for reproducing both information recording surfaces from the substrate side provided with the translucent reflective layer DVD has also been commercialized. Further, a rewritable DVD having a similar two-layer structure but having a rewritable thin film recording layer instead of a metal reflective layer on the information recording surface has also been proposed.

In recent years, as typified by high-definition television broadcasting and the like, the capacity of information has further increased, and accordingly, higher density recording has also been required for recording media. As a method for further increasing the recording density of the optical disc, a method of increasing the NA of the objective lens by using three or more layers, a method of utilizing a blue-violet laser is being studied. A signal transfer method (2P method) using a metal stamper is widely known as a method of forming a multilayer structure.

[0005]

However, in the case of a multi-layered structure, it is difficult to form an information recording layer other than the information recording layer composed of grooves or concave and convex pits formed by injection molding. Further, as described above, the smaller the thickness of the recording / reproducing side substrate, the larger the allowable tilt value. Although it has been proposed to make the thickness around 400 nm, the recording / reproducing side substrate becomes thinner,
When the thickness becomes 0.3 mm or less that cannot be injection-molded, it becomes difficult to produce a two-layer structure. In the case of using a metal stamper, the thickness of the radiation curable resin for transferring the signal is difficult to be uniform, it is difficult for the radiation to pass through, so the radiation curable resin does not cure, the device becomes large, and the transfer time is long. There was a problem such as being expensive.

Therefore, the present invention provides a method of manufacturing an optical information recording medium having a multilayer structure and an optical information recording medium, and more particularly, a method of manufacturing a multilayer optical information recording medium corresponding to a thinner recording / reproducing side substrate and an optical information recording medium. The purpose is to provide a recording medium.

[0007]

In order to solve the above-mentioned problems, the manufacturing method of the present invention is a first method having a stamper having grooves or concave / convex pits on one main surface and an information recording layer SA on one main surface. The first step of adhering the substrate with the groove or concave and convex pits and the information recording layer SA facing each other and adhering them through the resin material A and the resin material B, and In addition, the stamper, the resin material A,
A first step of laminating a resin material B and the first substrate in this order; and) a stamper is peeled off to form a groove or an uneven pit made of the resin material A on the signal recording layer SA of the first substrate. And a third step of forming the information recording layer SB by forming a reflective film or a recording film in the groove or the uneven pit made of the resin material A. An optical information recording medium having multiple information recording layers can be produced by the method for producing an optical information recording medium of the present invention. Since the resin materials A and B share the adhesiveness with the stamper, the transferability, the ease of peeling, and the strength of the adhesive force, the development of the resin material is easy.

In the above-mentioned manufacturing method of the present invention, it is preferable that the resin material B is a sheet-like adhesive material. By using the sheet-shaped material, it is possible to manufacture the portion sandwiched between the signal recording layer SA and the signal recording layer SB with extremely high thickness accuracy, and the recording / reproducing characteristics become very good.

In the manufacturing method of the present invention, the information recording layer S
It is preferable to dispose the resin material C on A in advance. By selecting a resin material C with high hardness,
Damage to the information recording layer SA at the time of peeling the stamper is reduced. In particular, when the information recording layer SA is a rewritable recording layer composed of a plurality of thin films, the strength of the thin film may be low, which is effective. It also has an effect of preventing the information recording layer SA from deterioration such as corrosion.

In the manufacturing method of the present invention, the information recording layer S
It is preferable that a light transmitting layer is formed on B. As a result, the information recording layer SB is protected.

In the above manufacturing method of the present invention, the stamper is preferably made of a resin material. The resin stamper is lighter and more flexible than a stamper using a metal material. Therefore, even when a radiation curable resin is used as the resin material A, it is easy to make it uniform by rotating using a technique such as spin coating, and handling is also easy. It is cheaper than a metal stamper and can be manufactured in large quantities by injection molding. With a stamper made of a metal material or the like, it is difficult to make a large amount of spares, and if there is a defect in the production of the optical information recording medium, replacement is not easy.

In the above-mentioned manufacturing method of the present invention, in the first step, the resin material A is made of a radiation curable resin, and the pressure P1 when the resin material A is laminated with the stamper,
Pressure P2 when the resin material A is cured by irradiation with radiation
Preferably has a relationship of P1 <P2. As a result, the degree of adhesion between the resin material A and the stamper is improved, and the transferability of the groove or the uneven pit from the stamper to the resin material A is improved.

In the above manufacturing method of the present invention, it is preferable that the inner peripheral end diameter of the resin material A is smaller than the inner peripheral end diameter of the resin material B. Accordingly, the resin material B does not adhere to the stamper at the inner peripheral portion, and the stamper and the first substrate can be easily separated.

In the above-mentioned manufacturing method of the present invention, it is preferable that the resin material A is disposed up to the outer peripheral end of the stamper.
As a result, the resin material B does not adhere to the stamper at the outer peripheral portion, and the stamper and the first substrate can be easily separated.

In the above-mentioned manufacturing method of the present invention, it is preferable that the groove or the concave and convex pits of the stamper are subjected to a treatment for improving the mold release. Thereby, the stamper can be easily peeled off and the transferability can be improved.

In the above manufacturing method of the present invention, it is preferable that both the stamper and the first substrate have a central hole, and that the central hole of the stamper and the central hole of the first substrate are substantially the same.
This makes it easy to align the centers of the plurality of information recording layers formed on the first substrate.

Further, the optical information recording medium manufactured by the above-described manufacturing method of the present invention enables a higher density by a plurality of information recording layers.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) Here, a first method for manufacturing an optical information recording medium of the present invention will be described. 1 to 8 show an example of a method for manufacturing an optical information recording medium according to the present invention. FIG. 1 shows a flow of a method for manufacturing an optical information recording medium according to the present invention.

The resin stamper 101 shown in FIG. 2A is a polycarbonate substrate having a thickness of 1.1 mm, a diameter of 120 mm, and a central hole 102 having a diameter of 15 mm formed by injection molding.
A guide groove 103 is provided on one main surface. Polycarbonate is widely used in optical discs such as CDs and DVDs, and was used because it is inexpensive and easy to manufacture by injection molding. A resin material may be used. Further, in this embodiment mode, a material having no light-transmitting property may be used. Further, although the resin stamper having a thickness of 1.1 mm is used here, it is thinner.
For example, one having a thickness of about 0.6 mm may be used. Material cost can be kept low by making it thin.

In the guide groove 103 of the resin stamper 101, as shown in FIG. 2B, a resin material A1 which is a radiation curable resin is used.
No. 04 was dripped in a substantially annular shape by the nozzle 201, and the resin stamper was rotated and shaken off as shown in FIG. Since a light resin material is used as the stamper, it can be easily shaken off by rotation. After that,
The resin material A10 is irradiated with the radiation 202 as shown in (a).
4 was cured (resin material A after curing was designated as 204). Here, the radiation curable resin is a resin that is cured by radiation, and the radiation means all electromagnetic waves and particle waves. Specific examples of the radiation curable resin include an ultraviolet curable resin that is cured by ultraviolet irradiation and a resin that is cured by electron beam irradiation.

The first substrate 111 shown in FIG. 3B is a polycarbonate substrate formed by injection molding and having a thickness of 1.1 mm, an outer diameter of 120 mm, and a central hole 112 of 15 mm, and has a guide groove 113 on one main surface. An information recording layer SA116 including a recording layer 115 composed of a plurality of thin film layers is provided. The first substrate may be made of a resin material other than polycarbonate, such as an acrylic resin or a polyolefin resin. Further, since the first substrate is not the recording / reproducing substrate here, an opaque resin having a low light transmittance may be used.

As shown in FIG. 3C, the resin stamper having the resin material A204 laminated thereon and the first substrate 111 were attached to each other with the resin material B105 which is a sheet-like adhesive material. Since the resin stamper and the first substrate have substantially the same center hole, it is possible to easily make the centers of the respective guide grooves substantially coincide with each other. It is preferable that air bubbles and the like are not mixed in the bonding. Further, it is preferable that distortion or the like does not occur at the time of bonding. As such a method, there is a method of bonding in a vacuum. Alternatively, it is also possible to bond them so that air is pushed out from the inner peripheral end surface or the outer peripheral end surface.

By using a sheet-like adhesive material as the resin material B, the thickness between the signal recording layers, for example, as shown in FIG.
The precision of the thickness between the signal recording layer SA and the signal recording layer SB can be made high and the variation can be reduced. Further, since there is no concern about shrinkage due to curing as in the case of using a radiation curable resin, distortion does not occur after bonding. Although the adhesive material made of a single material is used as the resin material B here, the adhesive material may be applied to both surfaces as shown in FIG. A substance having a property of being cured by irradiation with radiation may be used, but in that case, as described above, it is preferable to select a substance having a small shrinkage due to curing.

As shown in FIG. 5A or FIG. 5B, the resin stamper is peeled off at the interface with the resin material A. Thereby, the resin material A to which the guide groove is transferred can be formed on the information recording layer SA of the first substrate. Here, a hook 301 or a wedge 303 in the shape of a hook is used to float a part of the outer peripheral end or the inner peripheral end of the resin stamper, and air is blown onto the part of the resin stamper for peeling. The outer diameter of the resin stamper may be substantially the same as that of the first substrate, but in the case of FIG. 5A, by changing the outer diameters of the resin stamper and the first substrate, it is possible to remove The hook can be easily inserted and the peeling can be performed efficiently. Alternatively, the outer peripheral end shape of the stamper can be processed so that the hook can be easily inserted.

It is preferable that the resin material A has good adhesiveness and transferability and weak adhesive force with the stamper. Further, it is preferable that the resin material B has a high adhesive force with the information recording layer of the first substrate and the resin material A. At this time, since the resin material B and the resin stamper are adhered to each other and peeling is difficult, the outer peripheral edge diameter of the resin material A is set to be equal to or larger than the outer peripheral edge diameter of the resin material B. The inner peripheral end diameter of was set to be equal to or smaller than the inner peripheral end diameter of the resin material B. By using two types of resin materials, the effects of transferability and adhesiveness can be distributed to different resin materials, and the resin material can be easily developed.

Further, the stamper may be subjected to a treatment for improving the mold release in consideration of the ease of peeling from the resin material A. Metal-based film, eg Si, Ag, A
A film other than u or a metal, for example, a thin film such as a dielectric film may be formed. Furthermore, on the guide groove of the resin stamper or on the thin film formed on the resin stamper,
A release agent may be applied in advance. Here, the release agent is specifically siloxane, a fluorine monomolecular film, or the like.

When the information recording layer SA has a low tensile strength, the information recording layer SA is peeled off when the resin stamper is peeled off.
Can be damaged. Therefore, as shown in FIG. 6, a resin material C2 is previously formed on the information recording layer SA for protection.
By arranging 05, damage can be eliminated. At this time, it is preferable that the resin material C is arranged so as to cover at least the inner peripheral edge to the outer peripheral edge of the information recording layer SA. Further, it is preferable that the inner periphery is arranged so as to cover a part or the whole of the clamp region of the first substrate and the outer periphery is arranged so as to cover up to the outer peripheral end of the first substrate. When the pencil hardness of the resin material C was B or more, the damage at the time of peeling the stamper could be completely eliminated. From this, it is preferable that the pencil hardness of the resin material C is B or more.

The peeled resin stamper may be reused as it is, or may be discarded or remanufactured through a process such as melting and refining if the efficiency of signal transfer becomes poor. Since a cheap resin material is used as a stamper, the cost is low even when it is discarded. In addition, injection molding allows mass production of stampers. With a stamper made of a metal material or the like, it is difficult to easily make a large amount of spares, and it is not easy to replace the stamper if a defect occurs in mass production of the optical information recording medium.

On the first substrate on which the guide groove is transferred, as shown in FIG.
As in (a), the semitransparent recording film 118 is formed and the information recording layer SB119 is formed. Second substrate 1 of FIG. 7B
No. 21 has a thickness of 90 μm, a diameter of 119.5 mm, and a central hole 1
It is a sheet-shaped substrate made of polycarbonate having a diameter of 22 mm and is flat without an information recording layer. Second substrate 121
Is cut from a sheet made by the casting method. The second substrate 121 may be made of an acrylic or norbornene resin material.

This second substrate and the information recording layer SA116
And the first substrate 1 on which the information recording layer SB119 is formed
7 with the main surface having the information recording layer SA and the information recording layer SB inside as shown in FIG.
It stuck like (c). The bonding at this time is
As shown in FIG. 8, first, as shown in FIG. 8A, one substrate is coated with a radiation-curable resin in a substantially annular shape, and as shown in FIG. As described above, the first substrate and the second substrate which are integrated via the radiation curable resin are rotated, and the radiation curable resin is stretched substantially uniformly. Then, it was irradiated with radiation to cure the radiation curable resin.
By using the sheet-shaped second substrate as the light transmission layer, it is easy to make the thickness of the light transmission layer substantially uniform. Further, by using a sheet-like adhesive material such as the resin material B instead of the radiation curable resin, the thickness accuracy can be further improved. Furthermore, it is possible to reduce the cost by forming the light transmitting layer only with the radiation curable resin. By setting the thickness of the optical information recording medium after the light transmission layer is formed to 1.2 mm, it is possible to
Thickness compatibility with D can be ensured.

In the present embodiment, the light transmitting layer for protecting the information recording layer SB is provided, but if the optical information recording medium is stable without the light transmitting layer, the light transmitting layer may not be provided. Good.

In this embodiment, the recordable type, which is composed of a thin film layer capable of signal recording / reproducing as the information recording layer, has been described.
It goes without saying that it may be a so-called read-only type in which a reflective layer is provided. In this way, according to the manufacturing method of the above-described embodiment, it is possible to manufacture a high-density optical information recording medium.

Although the embodiments of the present invention have been described above with reference to the examples, the present invention is not limited to the above-described embodiments, and can be applied to other embodiments based on the technical idea of the present invention. You can

(Embodiment 2) In Embodiment 2, an example of a method for manufacturing the optical information recording medium of the present invention will be described. Note that duplicate description may be omitted for portions similar to those described in the first embodiment. The resin stamper, the first substrate, the resin material A, the resin material B, etc. used are the same as those in the first embodiment.

In the first embodiment, the resin material A, which is a radiation curable resin, is applied to the resin stamper and then immediately cured by irradiation with radiation, but this curing is performed by integrating the resin stamper and the first substrate. You can go later. When the resin material A is in a liquid state, air bubbles may be less likely to enter when the resin material A and the resin material B are brought into close contact with each other. However, in this case, in order to cure the resin material A,
It is preferable that the resin stamper is transparent to some extent to the radiation for curing the resin material A.

The pasting method in this case is as shown in FIG.
There is a method similar to that shown in. The resin material A is applied on the resin stamper in a substantially annular shape, the first substrate and the resin material B are integrated, and then the resin material A is stretched by stacking and rotating from above. Then irradiate,
The resin material A is cured.

The parts other than the above are the same as those described in the first embodiment. The embodiments of the present invention have been described above by way of examples, but the present invention is not limited to the above embodiments and can be applied to other embodiments based on the technical idea of the present invention.

(Embodiment 3) In Embodiment 3, an example of a method for manufacturing the optical information recording medium of the present invention will be described. Note that duplicate description may be omitted for the same parts as those described in the first and second embodiments.
The resin stamper, the first substrate, the resin material A, the resin material B, etc. used are the same as those in the first embodiment.

In the first and second embodiments, the resin material A is applied on the guide groove of the resin stamper, but it may be applied on the resin material B. For application to resin material B,
It does not matter whether the resin material B is integrated with the first substrate or not. At this time, the resin material A is cured after the resin stamper and the first substrate are bonded together. Therefore, in the same manner as described in the second embodiment, the resin stamper can be cured by the resin material A in order to cure the resin material A. It is preferably transparent to some extent to the radiation for curing A.

The pasting method in this case is as shown in FIG.
There is a method similar to that shown in. The method described in the second embodiment can be performed in the same manner as in the case where the first substrate and the resin stamper are replaced.

The parts other than the above are the same as those described in the first embodiment. The embodiments of the present invention have been described above by way of examples, but the present invention is not limited to the above embodiments and can be applied to other embodiments based on the technical idea of the present invention.

(Embodiment 4) In Embodiment 4, an example of a method for manufacturing the optical information recording medium of the present invention will be described. In addition, with respect to the same parts as those described in the first to third embodiments, duplicated description may be omitted.
The first substrate, the resin material B, etc. used are the same as those in the first embodiment.
Is the same as.

In this embodiment, a pressure sensitive sheet is used as the resin material A. Here, the pressure-sensitive sheet refers to a sheet which is in contact with the sheet and changes in shape when pressure is applied to the sheet. By pressing the stamper against the pressure sensitive sheet, the guide groove on the stamper can be transferred to the pressure sensitive sheet.

Here, after the first substrate, the resin material B and the pressure sensitive sheet were integrated, the stamper was pressed against the pressure sensitive sheet. By making the center hole of the stamper and the center hole of the first substrate substantially the same, the center of the guide groove of the stamper and the center of the guide groove of the first substrate can be easily made substantially the same when the stamper is pressed.

By using a sheet-shaped material for the resin material A as well as the resin material B, the thickness between the signal recording layers can be made highly precise and less variable. Further, unlike the radiation curable resin, there is no need to worry about the distortion caused by the curing shrinkage.

The parts other than the above are the same as those described in the first embodiment. The embodiments of the present invention have been described above by way of examples, but the present invention is not limited to the above embodiments and can be applied to other embodiments based on the technical idea of the present invention.

(Fifth Embodiment) In the fifth embodiment, an example of a method of manufacturing the optical information recording medium of the present invention will be described. In addition, with respect to the same parts as those described in the first to fourth embodiments, duplicated description may be omitted.

In the first to fourth embodiments, the radiation curable resin is used as the resin material A. However, other materials can be selected as long as the transfer from the stamper is good and the stamper can be easily peeled off. For example, by using a stamper having high heat resistance, a thermoplastic resin may be used as the resin material A, and the resin material A may be melted and applied onto the stamper. It is also possible to use a thermosetting resin as the resin material A, apply it on the stamper, and then heat-treat it to cure it. The optimum material is preferably selected in consideration of the combination of the stamper and the resin material A.

The parts other than the above are the same as those described in the first embodiment. The embodiments of the present invention have been described above by way of examples, but the present invention is not limited to the above embodiments and can be applied to other embodiments based on the technical idea of the present invention.

(Embodiment 6) It has been described that it is easy to form the information recording layer SB on the information recording layer SA of the first substrate by the manufacturing method of any of the first to fifth embodiments. . In the first to fourth embodiments, only the information recording medium having the two-layer structure as shown in FIG. 7C has been described. However, the information recording layer SB on the first substrate has the first embodiment. By repeatedly using the same method as described in No. 4 to No. 3,
It is also possible to manufacture an information recording medium having a layered structure, a four-layered structure, or a multilayered structure having more layers. In FIG. 9, the resin material A transferred to the guide groove and the recording layer formed thereon are shown as a signal layer, the resin material B as an intermediate layer, and the resin material C as a protective layer. As described in the first embodiment, the resin material C forming the protective layer can be omitted if there is no problem in peeling the stamper.

[0052]

As described above, according to the method of manufacturing an optical information recording medium and the optical information recording medium of the present invention, it is easy to manufacture a multilayer optical information recording medium, and in particular, the recording / reproducing side substrate is made thin. Also in the above optical information recording medium, a multilayer optical information recording medium can be easily manufactured. Specifically, by using a stamper made of a resin material, since the stamper is light and has flexibility, handling is easy. By rotating the stamper, the resin material for transfer can be stretched substantially uniformly. Further, even when the stamper cannot be peeled off well and the stamper needs to be replaced, the resin stamper can be mass-produced at low cost by injection molding. Further, by using the resin material B which is a sheet-shaped adhesive material, the thickness accuracy between the signal recording layers can be increased and the variation can be reduced, and the shrinkage due to curing such as in the case of using the radiation curable resin can be suppressed. An optical information recording medium having no distortion can be manufactured.

According to the present invention, the above advantageous effects can be obtained.

[Brief description of drawings]

FIG. 1 is a diagram showing the flow of a method for manufacturing an optical information recording medium according to the present invention.

FIG. 2 is a diagram showing a method for manufacturing an optical information recording medium according to the present invention.

FIG. 3 is a diagram showing a method for manufacturing an optical information recording medium according to the present invention.

FIG. 4 is a diagram showing a method for manufacturing an optical information recording medium according to the present invention.

FIG. 5 is a diagram showing a method for manufacturing an optical information recording medium according to the present invention.

FIG. 6 is a diagram showing a method for manufacturing an optical information recording medium according to the present invention.

FIG. 7 is a diagram showing a method for manufacturing an optical information recording medium according to the present invention.

FIG. 8 is a diagram showing a method for manufacturing an optical information recording medium according to the present invention.

FIG. 9 is a diagram showing a method for manufacturing an optical information recording medium according to the present invention.

[Explanation of symbols]

101 resin stamper 102 Center hole of resin stamper 103 guide groove 104 Resin material A 105 Resin material B 107 drops 108 core 109 Sticky substance 111 first substrate 112 Center hole of first substrate 113 guide groove 115 recordable thin film layer 116 Information recording layer SA 117 drops 118 translucent recordable thin film layer 119 Information recording layer SB 121 Second substrate 122 Center Hole of Second Substrate 124 Radiation curable resin 201 nozzle 202 radiation 204 Resin material A after curing 205 Resin material C 211 nozzles 301 hook 302 Wedge 303 Air blow 901 substrate 902 Information recording layer 903 central hole 904 Light transmission layer 911 First protective layer 912 First middle layer 913 First signal layer 921 Second protective layer 922 Second intermediate layer 923 second signal layer 951 substrate 952 Information recording layer 953 central hole 954 Light transmission layer 961 first protective layer 962 first middle layer 963 1st signal layer 971 Second protective layer 972 Second middle layer 973 second signal layer 981 Third protective layer 982 Third middle layer 983 Third signal layer

Front page continuation (51) Int.Cl. ⁷ identification code FI theme code (reference) G11B 7/24 G11B 7/24 535L (72) Inventor Shinji Ohno 1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric Industrial Co., Ltd. F-term (Reference) 5D029 JB13 LA02 LB11 LB13 LB17 MA34 MA42 NA03 NA09 NA23 NA25 5D121 AA04 AA06 CA06 DD06 DD07 DD13 GG02 GG10 GG30 JJ01

Claims (26)

[Claims] 1. A stamper having a groove or an uneven pit on one main surface and a first substrate having an information recording layer SA on one main surface, the groove or the uneven pit and the information recording layer SA facing each other, A first step of laminating the resin material A and the resin material B via the resin material A so that the groove or the concave and convex pits are in contact with the resin material A; Second for forming the groove or the uneven pit made of the resin material A
And a third step of forming an information recording layer SB by forming a reflective film or a recording film in the groove or the concave and convex pits made of the resin material A. Medium manufacturing method. 2. The method for manufacturing an optical information recording medium according to claim 1, wherein the resin material A is a radiation curable resin. 3. The method for manufacturing an optical information recording medium according to claim 1, wherein the resin material A comprises a pressure sensitive sheet. 4. The method for manufacturing an optical information recording medium according to claim 1, wherein the resin material B is a sheet-shaped adhesive material. 5. The manufacturing of the optical information recording medium according to claim 1, wherein a resin material C is previously arranged on the information recording layer SA of the first substrate. Method. 6. The method for manufacturing an optical information recording medium according to claim 5, wherein the resin material C has a pencil hardness of B or more. 7. The method of manufacturing an optical information recording medium according to claim 5, wherein the resin material C is arranged at least from the inner peripheral edge to the outer peripheral edge of the information recording layer SA. 8. The method according to claim 1, further comprising the step of forming a light transmission layer on the information recording layer SB.
A method for manufacturing an optical information recording medium according to any one of 1. 9. The method for manufacturing an optical information recording medium according to claim 8, wherein the thickness of the light transmitting layer is 0.3 mm or less. 10. The method for manufacturing an optical information recording medium according to claim 9, wherein the thickness of the light transmitting layer is 0.1 mm or less. 11. The method of manufacturing an optical information recording medium according to claim 8, wherein the light transmitting layer is made of a resin material. 12. The method of manufacturing an optical information recording medium according to claim 11, wherein the light transmitting layer is made of a radiation curable resin. 13. The method of manufacturing an optical information recording medium according to claim 11, wherein the light transmitting layer is composed of a radiation curable resin and a resin substrate. 14. The method for manufacturing an optical information recording medium according to claim 11, wherein the light transmitting layer is made of a sheet-shaped adhesive material and a resin substrate. 15. The method of manufacturing an optical information recording medium according to claim 1, wherein the stamper is made of a resin material. 16. The method of manufacturing an optical information recording medium according to claim 15, wherein the stamper is formed by injection molding. 17. The method of manufacturing an optical information recording medium according to claim 15, wherein the stamper is made of polycarbonate. 18. In the first step, a pressure P1 when the resin material A is laminated on the stamper and a pressure P2 when the resin material A is cured by radiation irradiation are set to P.
3. The method for manufacturing an optical information recording medium according to claim 2, wherein there is a relationship of 1 <P2. 19. The optical information according to claim 1, wherein an inner peripheral end diameter of the resin material A is the same as or smaller than an inner peripheral end diameter of the resin material B. Recording medium manufacturing method. 20. The optical information recording medium according to claim 1, wherein the outer peripheral edge diameter of the resin material A is the same as or larger than the outer peripheral edge diameter of the resin material B. Manufacturing method. 21. The optical information according to any one of claims 1 to 20, wherein the groove or the uneven pit of the stamper is subjected to a treatment for improving release. Recording medium manufacturing method. 22. The method of manufacturing an optical information recording medium according to claim 21, wherein a mold release agent is applied onto the groove or the concave and convex pits of the stamper. 23. The method of manufacturing an optical information recording medium according to claim 21, wherein a film containing a metal as a main component or a dielectric film is formed on the groove or the uneven pit of the stamper. 24. The stamper and the first substrate both have a center hole, and the center hole of the stamper and the center hole of the first substrate have substantially the same diameter. Item 24. A method for manufacturing an optical information recording medium according to any one of Items 1 to 23. 25. A plurality of information recording layers of three or more layers are formed by repeating the first step, the second step, and the third step two or more times a plurality of times. 25. The method of manufacturing an optical information recording medium according to claim 1. 26. An optical information recording medium manufactured by the manufacturing method according to any one of claims 1 to 25.