JP2009277266A - Method of manufacturing optical disk recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing an optical disk recording medium, which can manufacture an inexpensive optical disk recording medium. <P>SOLUTION: A flexible film sheet 10 for transfer, which is supported by one roll 100 and the other roll 105, is prepared, and an ultraviolet curing resin layer is continuously formed on the surface of the film sheet 10 for transfer in a process for winding the film sheet 10 for transfer from one roll 100 to the other 105. Then, a nickel stamper having an irregular shape is pressed to the ultraviolet curing resin layer formed on the surface of the film sheet for transfer, and at the same time ultraviolet rays are applied from the backside of the film sheet for transfer, thus curing the ultraviolet curing resin layer, and continuously forming the irregular shape on the ultraviolet curing resin layer. Then, a recording layer is formed in the order of higher light transmittance. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an optical disc recording medium manufacturing method for manufacturing an optical disc recording medium having a plurality of recording layers on which information is recorded by pits at low cost.

In recent years, optical disc recording media, which is one of the optical information recording methods, has become more and more information with the spread of personal computers, the start and spread of terrestrial digital broadcasting, and the acceleration of the spread of high-definition televisions to ordinary homes. Is required to be recordable. Therefore, there is a demand for an increase in recording density of optical disc recording media.
An optical disk recording medium is formed by forming a recording layer, for example, a recording film or a dielectric layer laminated on a substrate. Then, reading or writing of an information signal with respect to the optical disc recording medium is performed by irradiating a recording layer having a recording film with laser light.

  The recording density of the optical disk recording medium can be increased by reducing the diameter of the light spot collected on the recording film. The light spot diameter is limited by the wavelength (λ) of the light source and the numerical aperture (NA) of the objective lens, and is proportional to λ / 2NA.

  In order to achieve a high recording density of an optical disk recording medium, it is necessary to shorten the wavelength of the laser beam to be irradiated and to increase the NA of the objective lens. Regarding the wavelength, the wavelength is shortened from 830 nm of a CD as a first generation optical disc recording medium to 650 nm in a DVD (Digital Versatile Disc). Further, with respect to the NA, the NA, which is a first generation optical disc recording medium, is increasing to about 0.45 and about 0.60 for DVD.

  Furthermore, recently, an optical disk system (Blu-ray Disk: registered trademark, hereinafter referred to as BD) in which a blue laser having a wavelength of 405 nm is used as a light source and NA is increased to 0.85 has been put into practical use.

This BD is an optical disk recording medium that uses a technique for further increasing the recording density, which is a technique for further increasing the recording density in combination with increasing the recording density by reducing the light spot diameter.
A BD as a large-capacity optical disk recording medium is configured by laminating a metal thin film, a dielectric film or the like on an uneven surface on a 1.1 mm thick substrate and providing a protective layer with a thickness of about 0.1 mm.

  A method of manufacturing an optical disk recording medium having multiple recording layers and known as BD is described in, for example, Patent Document 1 below, and is generally performed as follows.

As an example, a manufacturing method of an optical disc recording medium having two recording layers will be described with reference to FIG.
First, as shown in FIG. 17A, a metal thin film, a thin film material capable of thermal recording, or the like is formed on a molded resin substrate 200 having a thickness of about 1.1 mm having pits and guide grooves each having an uneven shape on one side. One recording layer L0 is formed.
Next, as shown in FIG. 17B, a spacer layer 201 having a thickness of several μm to several tens of μm separating adjacent recording layers is formed on the first recording layer L0 on the molded resin substrate 200.
Then, by pressing a stamper 203 having an uneven shape such as a pit or a guide groove on one side on the spacer layer 201, the uneven pattern 201a of the pit or guide groove is formed on the spacer layer 201 as shown in FIG. 17C. Transcript to.
Subsequently, as shown in FIG. 17D, a metal thin film having a predetermined transmittance with respect to the wavelength of the laser beam to be recorded / reproduced on the concave / convex pattern 201a of the pit or guide groove transferred onto the spacer layer 201, or A thin film material capable of thermal recording is formed to form the second recording layer L1.
Finally, as shown in FIG. 17E, a protective layer 202 that protects the second recording layer L1 is formed on the second recording layer L1.

Through the above steps, an optical disc recording medium having two recording layers is formed.
In the case of increasing the number of layers by using two or more recording layers, for example, as described in Patent Document 2 below, the above-described second recording layer L1 is taken into consideration while taking into account interlayer crosstalk during signal recording and reproduction. This process can be repeated several times to stack a plurality of recording layers in order.

  The multilayer optical disc recording medium configured as described above is required to form a laminated recording layer within a range of 0.1 mm in order to reduce the influence of signal deterioration due to the tilt of the disc. In the optical disc recording medium having the two recording layers, the second recording layer L1 is formed via the first recording layer L0 and the spacer layer 201 of several microns to several tens of microns. A transparent protective layer 202 is formed.

  In addition, the optical disk recording medium having the multiple recording layers performs uniform recording and reading from the innermost periphery to the outermost periphery of the molded resin substrate 200. For this purpose, homogeneity and uniformity of the optical properties and physical shape of the spacer layer 201 set between the first recording layer L0 and the second recording layer L1 are required. At the same time, an inexpensive method for producing an optical disk recording medium is expected.

  Further, these optical disc recording media are expected to retain recorded information over a long period of time, since the purpose of long-term storage is an important purpose of use. For this reason, a multilayer structure capable of maintaining good recording characteristics even in a high temperature and high humidity environment or a low temperature environment is required.

JP 2003-22586 A JP 2007-257759 A

  By the way, the stamper 203 (FIG. 17B) having a concavo-convex shape such as a pit or a guide groove on one side used in the above-described conventional method for manufacturing an optical disc recording medium having two recording layers is often a transparent resin. It consists of An optical disk recording medium having two recording layers uses one transparent resin stamper. However, an optical disk recording medium on which n recording layers are formed uses n−1 transparent resin stampers. Become. And this transparent resin stamper cannot be reused. For this reason, the cost is increased in the conventional stamper process. Therefore, in the manufacture of an inexpensive optical disk recording medium, improvement of the stamper process has been demanded.

  In view of the above points, an object of the present invention is to provide a method for manufacturing an optical disk recording medium capable of manufacturing an inexpensive optical disk recording medium.

In order to solve the above-described problems and achieve the object of the present invention, the optical disk recording medium manufacturing method of the present invention first prepares one roll and a flexible transfer film sheet supported by the other roll. .
Then, in the process of winding the transfer film sheet from one roll to the other roll, an ultraviolet curable resin layer is continuously formed by applying an ultraviolet curable resin to the surface of the transfer film sheet.
Next, a nickel stamper having a concavo-convex shape is pressed against the ultraviolet curable resin layer formed on the surface of the transfer film sheet, and at the same time, ultraviolet rays are irradiated from the back side of the transfer film sheet. Thereby, the ultraviolet curable resin layer is cured, and an uneven shape is continuously formed on the ultraviolet curable resin layer.
Then, a recording layer is formed on the ultraviolet curable resin layer on which the uneven shape is formed.
Furthermore, after the recording layer is formed in the previous stage, in the process of winding the transfer film sheet from one roll to the other roll, the transfer film sheet is continuously coated by applying an ultraviolet curable resin on the surface of the transfer film sheet. A nickel stamper having a concavo-convex shape is pressed against the ultraviolet curable resin layer formed on the surface of the transfer film sheet, and at the same time, the transfer film sheet is irradiated with ultraviolet light from the back side. Thereby, an ultraviolet curable resin layer can be hardened and an uneven | corrugated shape can be continuously formed on an ultraviolet curable resin layer. Then, another recording layer having a light transmittance lower than that of the recording layer formed in the previous stage is formed on the ultraviolet curable resin layer on which the uneven shape is formed.
Then, the process of forming another recording layer is repeated a plurality of times as necessary to form a laminated film having a plurality of recording layers.

  In the method for producing an optical disk recording medium of the present invention, a plurality of recording layers are formed on a transfer film sheet in descending order of light transmittance. Therefore, even if it irradiates with ultraviolet rays from the back side of the transfer film sheet, the ultraviolet curable resin layer can be efficiently cured. Further, since the nickel stamper is used, the stamper can be repeatedly used in the stamper process. In the present invention, the transfer film sheet is manufactured while being unwound from one roll to the other roll. For this reason, a plurality of optical disk recording media are formed at a time.

  According to the present invention, an optical disc recording medium having a multi-layer recording layer can be UV-cured from the high transmittance side of the configuration, so that the recording layer can be freely designed and has good process consistency. It can be manufactured at low cost.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

[First Embodiment]
FIG. 1 shows a schematic cross-sectional configuration of a main part of an optical disk recording medium formed in the first embodiment of the present invention. The optical disc recording medium formed in the present embodiment is an optical disc recording medium having four recording layers. FIG. 1 shows a part of a cross section of an optical disk recording medium in which four recording layers are formed on a disk-shaped molded resin substrate 1 having a thickness of 1.1 mm and an outer diameter of about 120 mm.

The configuration will be described with reference to FIG.
The optical disk recording medium according to the present embodiment includes a first recording layer L0, a spacer layer 51, a second recording layer L1, a spacer layer 52, and a third recording layer L2 on a molded resin substrate 1 having a thickness of 1.1 mm. The spacer layer 53, the fourth recording layer L3, the cover layer 61, and the hard coat layer 71 are laminated in this order.

FIG. 2 shows the cross-sectional configuration of the optical disk recording medium shown in FIG. 1 in more detail.
The first recording layer L0 is formed by laminating a reflective film 12, a first dielectric film 13, a recording film 14, and a second dielectric film 15 from the molded resin substrate 1 side.
The second recording layer L1 is configured by laminating a reflective film 22, a first dielectric film 23, a recording film 24, and a second dielectric film 25 from the molded resin substrate 1 side.
The third recording layer L2 is formed by laminating a reflective film 32, a first dielectric film 33, a recording film 34, and a second dielectric film 35 from the molded resin substrate 1 side.
The fourth recording layer L3 is formed by laminating a reflective film 42, a first dielectric film 43, a recording film 44, and a second dielectric film 45 from the molded resin substrate 1 side.

Here, the recording films 14, 24, 34, and 44 are recording films made of a write-once layer change material, and are designed so that the signal amounts from the respective layers at the time of reading are equal.
That is, the magnitude relationship between the light transmittances of the first to fourth recording layers L0 to L3 in the optical disc recording medium of the present embodiment is L0 <L1 <L2 <L3.

  The thickness of the first and second dielectric films 13, 15, 23, 25, 33, 35, 43, and 45 used for the first to fourth recording layers L0 to L3 is preferably in the range of 3 nm to 100 nm. It is determined in consideration of optical characteristics and thermal characteristics.

The material of the first and second dielectric films 13, 15, 23, 25, 33, 35, 43, and 45 is preferably a material having a low absorption capacity with respect to the wavelength of the recording / reproducing laser. A material having an extinction coefficient K value of 0.2 or less is preferable. Examples of such a material include a ZnS—SiO ₂ mixture (preferably, a molar ratio of 4: 1). In addition to the ZnS—SiO ₂ mixture, a known material conventionally used as a material for the dielectric film of the optical disk recording medium can also be used.

Examples of the material of the first and second dielectric films 13, 15, 23, 25, 33, 35, 43, 45 include Al, Si, Ta, Ti, Zr, Nb, Mg, B, Zn, Pb, Use of nitrides, oxides, carbides, fluorides, sulfides, nitride oxides, nitrided carbides, acid carbides, etc. of elements such as metals such as Ca, La and Ge, and metalloids, and the use of these as main components and materials it can. Preferably, AlN _X (0.5 ≦ X ≦ 1), AlN, Al ₂ O _2-X (0 ≦ X ≦ 1), Al ₂ O ₃ , Si ₃ N _4-X (0 ≦ X ≦ 1), Si ₃ N _{4 -X} , SiO _X (1 ≦ X ≦ 2), SiO ₂ , SiO, MgO, Y ₂ O ₃ , MgAl ₂ O ₄ , TiO _X (1 ≦ X ≦ 2), TiO ₂ , BaTiO ₃ , StTiO ₄ , Ta ₂ O _5-X (0 ≦ X ≦ 1), Ta ₂ O ₅ , GeO _X (1 ≦ X ≦ 2), SiC, ZnS, PbS, Ge—N, Ge—N—O, Si— N—O, CaF ₂ , LaF, MgF ₂ , NaF, ThF ₄ or the like can be used.

  The film thicknesses of the recording films 14, 24, 34, and 44 used for the first to fourth recording layers L0 to L3 are preferably in the range of 5 nm to 30 nm, for example, about 15 nm. As a material for the recording films 14, 24, 34, and 44, a phase change material that undergoes an irreversible state change upon irradiation with laser light can be used. As such a material, for example, a chalcogen compound or a single chalcogen can be used. As the chalcogen compound, for example, an eutectic material of Sb and Te can be used, and preferably, an eutectic material of Sb and Te to which an additive element such as Ge is added can be used.

  For example, Ge—Sb—Te, Sb—Te, In—Sb—Te, Ag—In—Sb—Te, Au—In—Sb—Te, Ge—Sb—Te—Pd, Ge—Sb—Te. -A system containing Se, Ge-Sb-Te-Bi, Ge-Sb-Te-Co, Ge-Sb-Te-Au, or a system in which a gas additive such as nitrogen or oxygen is introduced into these systems. be able to.

  When the additive element is added to the recording films 14, 24, 34, 44, characteristics such as reliability can be improved, but signal characteristics are deteriorated. Considering this point, the amount of the additive element in the recording films 14, 24, 34, and 44 is preferably 10 atm% or less.

  The thickness of the reflective films 12, 22, 32, and 42 used for the first to fourth recording layers L0 to L3 is preferably 3 nm or more, and more preferably in the range of 5 nm to 60 nm.

  As a material of the reflective films 12, 22, 32, 42, for example, a metal or a semimetal can be used. The material of the reflective films 12, 22, 32, and 42 is preferably selected in consideration of reflectivity and thermal conductivity. For example, the reflective films 12, 22, 32, and 42 have reflectivity with respect to the wavelength of the recording / reproducing laser beam and have a thermal conductivity. Metal elements, metalloid elements, and compounds or mixtures thereof in the range of 0.0004 [J / (cm · K · s)] to 4.5 [J / (cm · K · s)].

  If the material of the reflective films 12, 22, 32, 42 is specifically illustrated, simple substance such as Al, Ag, Au, Ni, Cr, Ti, Pd, Co, Si, Ta, W, Mo, Ge, Or the alloy which has these as a main component can be mentioned. Of these, Al-based, Ag-based, Au-based, Si-based, and Ge-based materials are particularly preferable from the viewpoint of practicality. As the alloy, for example, Al—Ti, Al—Cr, Al—Cu, Al—Mg—Si, Ag—Pd—Cu, Ag—PdTi, Si—B and the like are preferably used.

  Among these materials, it is preferable to set in consideration of optical characteristics and thermal characteristics. For example, in view of having a high reflectance even in a single wavelength region, it is preferable to use an Al-based material or an Ag-based material. In general, when the thickness of the reflective films 12, 22, 32, and 42 is set to a thickness that does not allow light to pass through, for example, 50 nm or more, the reflectance can be increased and heat can be easily released. When the thickness of the reflective films 12, 22, 32, and 42 is set to an appropriate thickness, for example, about 10 nm, heat escape can be secured while increasing the transmittance.

  Further, the reflective films 12, 22, 32, and 42 are not limited to a single layer structure, and may have a laminated structure in which, for example, two layers (reflective layers) made of metal or metalloid are laminated. It is also possible to have a multilayer structure having more than one layer. This facilitates optical design and facilitates balance with thermal characteristics. A barrier layer made of a SiN film or the like may be provided between the dielectric layer and the reflective layer.

  The spacer layers 51, 52, and 53 are arranged by spin-coating a light-transmitting material having ultraviolet sensitivity that forms a multilayer structure of an optical disk recording medium, and curing by ultraviolet irradiation. When recording and reproducing information signals from a multilayer optical disk recording medium, the arrangement and film thickness of this spacer are set for the purpose of suppressing interlayer crosstalk.

  The cover layer 61 is formed for the purpose of protecting the optical disk recording medium. The recording / reproducing of the information signal is performed, for example, by condensing the laser beam through the cover layer 61 onto the recording layer for recording the information signal. As the cover layer 61, for example, an ultraviolet gland curable resin, an ultraviolet curable resin and a polycarbonate sheet, or an adhesive layer and a polycarbonate sheet can be used. In the case of a multilayer optical disk recording medium, the cover layer 61 is set to be 100 μm on the 1.1 mm molded resin substrate 1 including the multilayer recording layer.

  The hard coat layer 71, like the cover layer 61, protects the recording / reproduction quality of information signals from mechanical shocks and scratches on the optical disk recording medium, and also from the adhesion of fingerprints when handled by the user. Used. As the hard coat layer 71, an ultraviolet curable resin such as a mixture of silica fine powder to improve mechanical strength, a solvent type, or a solventless type can be used. It has a mechanical strength and has a thickness of 1 μm to several μm in order to repel oil and fat such as fingerprints.

  A method for manufacturing an optical disk recording medium according to this embodiment will be described with reference to FIGS.

  3A and 3B show a schematic plan configuration showing an example of an apparatus used for application of the ultraviolet curable resin in the present embodiment and a cross-sectional configuration thereof. In this embodiment, for example, one roll is used as the unwinding roll 100 and the other roll is used as the take-up roll 105, and the transparent transfer film sheet 10 that is tension-supported is prepared on the two rolls. The transfer film sheet 10 moves while being wound around the winding roll 105 by rotating the winding roll 100 and the winding roll 105, respectively.

  As the transfer film sheet 10, any film that is flexible and can be wound can be used. Of these, films having excellent light transmittance such as polyethylene terephthalate film and polyester film are preferable. Furthermore, ZEONOR and ZEONOL, which are excellent in peelability, can also be suitably used. There are materials with low stretchability such as polyimide film, but this material is difficult to use in terms of light transmittance. The film thickness of the transfer film sheet 10 is preferably 0.3 mm to 0.1 mm or less, for example, which can be wound, and the film width is preferably 130 mm or more that can cover an area of about 120 mm in diameter of the optical disk recording medium.

  The transfer film sheet 10 that is tension-supported in a state of being wound around the unwinding roll 100 and the winding roll 105 is placed on a conveyance table (not shown). Further, feed control guide portions 102 are provided at both ends in a direction orthogonal to the longitudinal direction of the transfer film sheet 10.

And in such a structure, a coating material is apply | coated and formed into a film on the film sheet 10 for transfer using a roll coater method.
For this reason, the roll 101 with a cup is installed in the intermediate part of the transfer film sheet 10 tension-supported over the winding roll 105 from the unwind roll 100 on the surface side of the transfer film sheet 10. The cup-equipped roller 101 has a recess formed on the surface facing the surface of the transfer film sheet 101. Here, an ultraviolet curable resin is supplied to the surface of the transfer film sheet 10 from a paint supplier (not shown), and the cup-attached roll 101 is rotated on the surface of the transfer film sheet 10. As a result, the ultraviolet curable resin is applied to the surface of the transfer film sheet 10 at the depth of the depression of the roll with cup 101. In the present embodiment, the first adjustment roll 101b provided so as to be in contact with the cup-attached roll 101 and the second adjustment roll 101a are provided so as to be in contact with the first adjustment roll 101b. . The first adjusting roll 101b and the second adjusting roll 101a rotate in conjunction with the cup-equipped roll 101 so that the UV curable resin attached to the cup-equipped roll 101 is evenly distributed over the roll 101 with the cup. Can be extended. In this embodiment, the number of adjustment rolls is two, but the present invention is not limited to this, and a plurality of adjustment rolls can be provided as necessary.

  Then, while transferring the transfer film sheet 10 from the unwinding roll 100 to the winding roll 105, the coating material is supplied during the transfer, and the roll 101 with the cup is rotated. By doing so, an ultraviolet curable resin layer having a desired thickness can be continuously formed on the surface of the transfer film sheet 10.

Then, the ultraviolet light is irradiated from the back surface side of the transfer film sheet 10 using a light source 103 made of, for example, a flash lamp installed on the winding roll 105 side of the roll with cup 101. By doing so, the ultraviolet curable resin layer 106 on the surface of the transfer film sheet 10 is cured.
In the above process, the ultraviolet curable resin layer 106 is formed by applying the ultraviolet curable resin, and cured by irradiating with ultraviolet rays, whereby the cover layer 61 or the spacer layers 51, 52, 53 having a desired thickness is formed. Is formed. And the film sheet 10 for transfer in which those films | membranes were formed is wound up by the winding roll 105 continuously.

  Next, FIGS. 4A and 4B show a schematic plan configuration showing an example of an apparatus used in the stamper process and a cross-sectional configuration thereof in this embodiment. 4A and 4B, parts corresponding to those in FIGS. 3A and 3B are denoted by the same reference numerals, and redundant description is omitted.

  In this embodiment, a nickel stamper is formed in a roll shape on the transfer film sheet 10 on the take-up roll 105 side of the roll 101 with a cup installed on the transfer film sheet 10. A stamper roll 107 is installed. The nickel stamper roll 107 is formed with a concavo-convex shape to be a pit or a guide groove of the optical disk recording medium, and is provided at a position where the concavo-convex shape is pressed onto the transfer film sheet 10.

  A light source 103 made of, for example, a flash lamp for irradiating ultraviolet rays is installed on the unwinding roll 105 side from the nickel stamper roll 107 and on the back surface side of the transfer film sheet 10. The light source 103 is provided at a position closer to the transfer film sheet 10 than the position facing the nickel stamper roll 107.

  In such a configuration, first, the ultraviolet curable resin layer 106 is applied to the surface of the transfer film sheet 10 transferred from the unwinding roll 105 by the roll 101 with a cup to a desired thickness. Thereafter, when the nickel stamper roll 107 is pressed on the ultraviolet curable resin layer 106, an uneven shape 106a is formed on the ultraviolet curable resin layer 106, and at the same time, ultraviolet rays are irradiated from the back surface of the transfer film sheet 10. As a result, the ultraviolet curable resin layer 106 is cured. As a result of this series of flows, an ultraviolet curable resin layer 106 having a concavo-convex shape 106 a is formed on the transfer film sheet 10. The uneven shape 106a is formed, for example, within a range from a lead-in zone to a lead-out zone of an optical disk recording medium to be manufactured.

  Incidentally, the nickel stamper roll 107 used in this embodiment is made of nickel. Since the stamper made of nickel can be used repeatedly, continuously from the unwinding roll 100 as one roll to the winding roll 105 as the other roll while continuously winding the transfer film sheet 10, Irregularities 106a corresponding to a plurality of optical disk recording media can be formed. Then, the transfer film sheet 10 having the concavo-convex shape 106 a formed on the upper surface of the ultraviolet curable resin layer 106 is taken up by the take-up roll 105 as needed.

  Next, FIGS. 5A and 5B show a schematic plan configuration showing an example of an apparatus used in the recording layer forming step in this embodiment, and a cross-sectional configuration thereof. 5A and 5B, parts corresponding to those in FIGS. 3A and 3B are denoted by the same reference numerals, and redundant description is omitted.

  Here, for example, the transfer film sheet 10 in which the ultraviolet curable resin layer 106 having the uneven shape 106 a is formed on the unwinding roll 100, and the roll film 105 is wound on the uneven roll shape 106 a while being wound on the take-up roll 105. Then, the recording layer 108 is formed by sputtering. For example, the transfer film sheet 10 that is tension-supported by the unwinding roll 100 and the winding roll 105 is conveyed to a stapper device, and a desired dielectric film, reflection film, A recording film is formed. Also in this case, the recording layer 108 can be continuously formed while winding the transfer film sheet 10 from the unwinding roll 100 to the winding roll 105. Here, using the mask, the recording layer 108 is formed at a desired position on the upper surface of each of the concavo-convex shapes 106a corresponding to the plurality of optical disk recording media formed in the previous stage.

  Next, a process for forming an optical disk recording medium formed using the method of FIGS. 3 to 5 will be described with reference to FIGS. The process diagrams of FIGS. 6 to 11 show the cross-sectional configuration of the main part of the product.

  First, as shown in FIG. 6A, a transfer film sheet 10 that is tension-supported between an unwinding roll 100 and a winding roll 105 shown in FIGS. 3A and 3B is prepared.

  Subsequently, by the method shown in FIGS. 3A and 3B, the transfer film sheet 10 is wound around the transfer film sheet 10 from the unwind roll 100 to the take-up roll 105, and UV-cured to a desired thickness on the surface of the transfer film sheet 10. Apply resin. Then, by curing the ultraviolet curable resin by ultraviolet irradiation, a cover layer 61 is formed on the surface of the transfer film sheet 10 as shown in FIG. 6B.

Next, the transfer film sheet 10 on which the cover layer 61 is formed is installed as the unwinding roll 100 shown in FIGS. 4A and 4B. Then, as shown in FIGS. 4A and 4B, an ultraviolet curing is performed by the roll 101 with the cup while winding the transfer film sheet 10 on which the cover layer 61 is formed on the take-up roll 105 from the unwind roll 100. Apply resin. By doing so, as shown in FIG. 6C, a spacer layer 61a made of an ultraviolet curable resin layer is formed.
Thereafter, the transfer film sheet 10 on which the spacer layer 61a made of an ultraviolet curable resin layer is formed is sent to the position of the nickel stamper roll 107 having pits and guide grooves. Here, as shown in FIG. 7D, the concave-convex shape 3a for forming the fourth recording layer L3 of the optical disk recording medium is formed, and ultraviolet light is irradiated from the light source 103 in FIGS. The resin layer is cured.
As described above, in the method shown in FIGS. 4A and 4B, the uneven shape 3a for forming the fourth recording layer L3 is formed on the spacer layer 61a and the spacer layer 61a.

  By the way, in this embodiment, after the cover layer 61 is formed, the spacer layer 61a is formed, and the uneven shape 3a is formed on the spacer layer 61a. However, the present invention is not limited to this, and in the step of forming the cover layer 61, the uneven shape 3 a may be formed on the cover layer 61. In the example shown in FIGS. 1 and 2, a configuration in which an uneven shape is provided on the cover layer 61 is illustrated. In that case, the cover layer 61 may be formed from the beginning by the method shown in FIGS. 4A and 4B. In the schematic cross-sectional configuration shown in FIG. 4, the spacer layer 61 a is shown to be thicker than the cover layer 61, but actually the thickness of the cover layer 61 is approximately 55 μm, whereas the spacer layer 61 a The film is formed to 1 to 3 μm.

  Next, the transfer film sheet 10 provided with the uneven shape 3a on the spacer layer 61a is carried into a sputtering apparatus (not shown), and a fourth recording layer L3 is formed as shown in FIG. 7E. In the present embodiment example, the fourth recording layer L3 is the recording layer having the highest light transmittance among the recording layers formed in the present embodiment example. As shown in FIG. 2, the fourth recording layer L3 is formed in the order of the second dielectric film 45, the recording film 44, the first dielectric film 43, and the reflective film 42 in a vacuum. . Then, the fourth recording layer L3 is formed by these laminated films. In this sputtering method, the second dielectric film 45, the recording film 44, the first dielectric film 43, and the reflective film 42 are formed on a single optical disk recording medium by using a mask, for example. Is formed in the range of 40 mm to 118 mm in diameter from the center.

  Next, the transfer film sheet 10 on which the fourth recording layer L4 is formed is again wound around the take-up roll 105 as the unwind roll 100 shown in FIGS. An ultraviolet curable resin to be the layer 53 is applied. As a result, as shown in FIG. 7F, the spacer layer 53 is formed on the fourth recording layer L3.

Then, the transfer film sheet 10 on which the spacer layer 53 made of an ultraviolet curable resin is formed is sent to the position of the nickel stamper roll 107 having pits and guide grooves shown in FIGS. 4A and 4B. Here, as shown in FIG. 8G, an uneven shape 53a for forming the third recording layer L2 of the optical disk recording medium is formed on the spacer layer 53, and from the light source 103 in FIGS. 4A and 4B. The spacer layer 53 made of an ultraviolet curable resin layer is cured by being irradiated with ultraviolet rays. Here, in the present embodiment example, the fourth recording layer L3 is formed on the ultraviolet irradiation side with respect to the spacer layer 53 in the previous stage, but the fourth recording layer L3 transmits the light from the light source 103 to the spacer layer. 53 is transmitted through. For this reason, the desired uneven | corrugated shape 53a is formed in the spacer layer 53 also by the ultraviolet irradiation from the back side of the transfer film sheet 10.
As a result, as shown in FIG. 8G, an uneven shape 53 a for forming the third recording layer L 2 is formed on the spacer layer 61 a and the spacer layer 53.

  Next, the transfer film sheet 10 provided with the uneven shape 53a on the spacer layer 53 is carried into a sputtering apparatus, and a third recording layer L2 is formed as shown in FIG. 8H. In the present embodiment example, the third recording layer L2 is the recording layer having the second highest light transmittance among the recording layers formed in the present embodiment example. As shown in FIG. 2, the third recording layer L2 is formed in vacuum in the order of the second dielectric film 35, the recording film 34, the first dielectric film 33, and the reflective film 32. . Then, the third recording layer L2 is formed by these laminated films. In this sputtering method, the second dielectric film 35, the recording film 34, the first dielectric film 33, and the reflective film 32 are formed on a single optical disk recording medium by using a mask, for example. Is formed in the range of 40 mm to 118 mm in diameter from the center.

Next, the transfer film sheet 10 on which the third recording layer L2 is formed is again wound around the take-up roll 105 as the unwind roll 100 shown in FIGS. An ultraviolet curable resin to be the layer 52 is applied. As a result, as shown in FIG. 8I, the spacer layer 52 is formed on the third recording layer L2.
Then, the transfer film sheet 10 on which the spacer layer 52 made of an ultraviolet curable resin is formed is sent to the position of the nickel stamper roll 107 having pits and guide grooves shown in FIG. Here, an uneven shape 52a for forming the second recording layer L1 is formed on the spacer layer 52 of the optical disk recording medium, and ultraviolet rays are irradiated from the light source 103 in FIGS. The spacer layer 52 made of is cured. Here, in the present embodiment example, the fourth recording layer L3 and the third recording layer L2 are formed on the light irradiation side with respect to the spacer layer 52 in the previous stage, but the fourth recording layer L3 and the third recording layer L2 are formed. The third recording layer L 2 transmits ultraviolet light emitted from the light source 103 to the spacer layer 52. For this reason, the desired uneven | corrugated shape 52a is formed in the spacer layer 52 also by ultraviolet irradiation from the back side of the transfer film sheet 10.
As a result, as shown in FIG. 9J, a concavo-convex shape 52a for forming the second recording layer L1 is formed in the spacer layer 52.

  Next, the transfer film sheet 10 provided with the uneven shape 52a on the spacer layer 52 is carried into a sputtering apparatus, and a second recording layer L1 is formed as shown in FIG. 9K. In the present embodiment example, the second recording layer L1 is the recording layer having the third highest light transmittance among the recording layers formed in the present embodiment example. As shown in FIG. 2, the second recording layer L1 is formed in the order of the second dielectric film 25, the recording film 24, the first dielectric film 23, and the reflective film 22 in a vacuum. . Then, the second recording layer L1 is formed by these laminated films. In this sputtering method, the second dielectric film 25, the recording film 24, the first dielectric film 23, and the reflective film 22 are formed on a single optical disk recording medium by using a mask, for example. Is formed in the range of 40 mm to 118 mm in diameter from the center.

  Subsequently, the transfer film sheet 10 on which the second recording layer L1 is formed is wound around the take-up roll 105 as the unwind roll 100 shown in FIGS. An ultraviolet curable resin layer 51a having a half thickness is formed. At this time, ultraviolet irradiation from the light source is not performed. By doing so, an uncured ultraviolet curable resin layer is formed on the second recording layer L1.

  Through the above steps, a laminated film having the second to fourth recording layers L1 to L3 is formed on the transfer film sheet 10. In this embodiment, by forming the recording layer on the transfer film sheet 10 in descending order of light transmittance, ultraviolet rays irradiated from the back side of the transfer film sheet 10 are changed to a desired spacer layer. The resulting UV curable resin layer can be efficiently reached. Thereby, an ultraviolet curable resin layer can be hardened efficiently.

  By the way, the recording layers L1 to L3 formed by the above steps are continuously formed in the process in which the transfer film sheet 10 is wound from the winding roll 100 to the winding roll 105. Therefore, in order to make each optical disk recording medium, it is necessary to separate and peel from the transfer film sheet 10 individually.

  12A and 12B, in this embodiment, a schematic plan configuration in a step of forming a cutout portion used when peeling a laminated film having a recording layer and a spacer layer from the transfer film sheet 10, and a cross section thereof. The configuration is shown.

The transfer film sheet 10 on which the laminated film is formed is pulled and supported by an unwinding roll and a take-up roll (not shown), and a roll cutter 109 for forming a notch is installed on the upper surface of the transfer film sheet 10. Has been. The roll cutter 109 is formed by embedding an inner peripheral blade (not shown) and an outer peripheral blade 109a in a roll-shaped base 109b. By rotating the roll cutter 109, the inner peripheral blade and the outer peripheral blade 109a are pressed against the laminated film. Thereby, as shown to FIG. 10P, the notch parts 91 and 92 are formed. The notch 91 is formed at a position having a diameter of 15 mm or more by the inner peripheral blade, and the notch 92 is formed at a position having a diameter of less than 120 mm by the outer blade 109a.
In FIGS. 12A and 12B, illustration of the unwinding roll and the winding roll is omitted, but also here, the transfer film sheet 10 on which the laminated film is formed is moved between the unwinding roll and the winding roll. Thus, the notches 91 and 92 can be formed continuously.

  By the way, the range of about 15 mm in diameter corresponds to the innermost periphery of the optical disk recording medium, and the diameter less than about 120 mm corresponds to the outermost periphery of the optical disk recording medium.

  FIG. 15 shows a layout of a recording layer of, for example, a BD write-once type, rewritable type and read-only type. The structure of the optical disk recording medium is roughly divided into a BCA (Burst Cutting Area) 111, a lead-in zone 112, a data area 113, a lead-out zone 114, an outer zone (Outer- Zone) 115. In the case of an optical disc recording medium having multiple recording layers like BD, the structure after the first recording layer L0 has the same layout except for BCA111. For this reason, in the present embodiment example, the structures of the second to fourth recording layers L1 to L3 have the same layout.

  In the present embodiment, the inner peripheral blade is configured to be inside the BCA 111 in the optical disc recording medium, and the outer peripheral blade 109a is configured to be outside the lead-out zone 114 in the optical disc recording medium. Is. That is, the innermost notch 91 has a diameter of about 20 mm to 40 mm, preferably 24 mm to 35 mm, and the outermost notch 92 has a diameter of 119 mm to 119 mm. More preferably, it is formed in a range of 119.5 mm.

  Further, the notches 91 and 92 have a depth that does not penetrate the transfer film sheet 10 and are formed to a depth at which peeling and transfer are possible. In this embodiment, for example, as shown in FIG. 10P, the notches 91 and 92 are formed up to just above the transfer film sheet 10.

It is important that the notches 91 and 92 do not have each film such as the second to fourth recording layers L1 to L3 of the optical disk recording medium in the cross section.
That is, the phase change recording material constituting the recording film of the optical disk recording medium is not covered with the cross section of the notches 91 and 92 and is continuously covered with the ultraviolet curable resin as the structure. This compensates for good recording characteristics over a long period of time whether exposed to a high temperature and high humidity environment or maintained in a low temperature environment. In the present embodiment, the second to fourth recording layers L1 to L3 are formed in a diameter range of 40 mm to 118 mm. Then, by forming the notch portion 91 outside the diameter 118 mm and the notch portion 92 inside the diameter 40 mm, the second to fourth recording layers L1 to L2 are formed in the cross section of the notches 91 and 92. L3 is not exposed.

In the present embodiment, the cut-out portions 91 and 92 are continuously formed by the roll cutter 109. However, for example, a flat cutter as shown in FIG. 14 may be used. FIG. 14A shows a schematic plan configuration of a planar cutter 300, and FIG. 14B shows a cross-sectional configuration along the line AA in FIG. 14A. As shown in FIGS. 14A and 14B, this cutter 300 is formed by embedding an inner peripheral blade 303 and an outer peripheral blade 304 in a disc-shaped base 301. In addition, an opening 302 is formed at the center of the disc-shaped pedestal 301, and is used, for example, for alignment when forming a notch. The inner peripheral blade 303 and the outer peripheral blade 304 are made of hardened steel, and the end surfaces are formed into knife edges. The pedestal 301 is made of, for example, metal or plastic.
When such a flat cutter 300 is used, the transfer film sheet 10 having the laminated film wound up from the unwinding roll to the winding roll is discontinuously moved, and in a stationary state, By aligning and pressing the cutter 300, the notches 91 and 92 can be formed. Thereby, the notches 91 and 92 are accurately formed, and the cross-sectional shape is improved.
Further, by forming the cutout portions 91 and 92, the edge portion is made flat.

Next, the transfer process is performed.
First, as shown in FIG. 10Q, a molded resin substrate 1 is prepared in which a concavo-convex shape 5 is imparted by injection molding and a center hole 4 having a diameter of about 15 mm is formed in the center. The uneven shape 5 is required to be in the same direction as the uneven shapes 53a, 52a, 3a of the second to fourth recording layers L1, L2, L3 to be bonded later. The molded resin substrate 1 is preferably made of a material that can be molded, has high light transmittance, and has low water absorption, such as polycarbonate, ZEONOR, and ZEONEX having a thickness of 1.1 mm and a diameter of 120 mm.

  Next, as shown in FIG. 10R, the molded resin substrate 1 provided with the uneven shape 5 is carried into a sputtering apparatus, and a first recording layer L0 is formed. The first recording layer L0 is formed in vacuum in the order of the second dielectric film 15, the recording film 14, the first dielectric film 13, and the reflective film 12. Thereby, the first recording layer L0 made of a laminated film is formed. In the present embodiment example, by forming the first recording layer L0 on the molded resin substrate 1 side, the process of forming the uneven shape 5 for the first recording layer L0 on the transfer film sheet 10 side is reduced. can do.

  Next, as shown in FIG. 10S, for the purpose of bonding with the laminated film formed on the transfer film sheet 10, a spacer layer 51b made of an ultraviolet curable resin is formed on the first recording layer L0. Of the spacer layer 51 in the finished product, ie, approximately half the thickness. The spacer layer 51b is formed by applying an ultraviolet curable resin on the first recording layer L0 by spin coating. In the present embodiment, in the spin coating method, when the central portion of the molded resin substrate 1 is the origin, an appropriate amount of the ultraviolet curable resin that becomes the spacer layer 51b is supplied to the position of the radius of 15 mm via the dispenser. At this time, the rotating part of the spin coater (not shown) is rotated at a low speed of 60 rpm, for example, while the ultraviolet curable resin is supplied. Then, the supply of the ultraviolet curable resin is completed after 5 to 10 seconds, and the rotating portion is accelerated to 8000 rpm and stopped after 5 seconds. As a result, an uncured spacer layer 51b applied to a desired thickness, for example, 9 μm, is formed on the first recording layer L0.

  Next, the laminated film formed on the transfer film sheet 10 is transferred onto the molded resin substrate 1. 13A and 13B show a schematic plan configuration showing the transfer process and a cross-sectional configuration thereof. The uncured spacer layer 51b on the molded resin substrate 1 is joined to the uncured spacer layer 51a on the transfer film sheet 10. At this time, alignment is performed so that the positions of the notches 91 and 92 coincide with the innermost peripheral portion and the outermost peripheral portion of the molding resin substrate 1, respectively. In the joined state, the pressure is applied from the back surface side of the transfer film sheet 10 with the conical pressure pad 110, and at the same time, the ultraviolet light is irradiated from the light source 103 installed on the molded resin substrate 1 side, The cured spacer layers 51a and 51b are cured. Then, by peeling the molded resin substrate 1 from the transfer film sheet 10 side, as shown in FIG. 11T, the laminated films having the second to fourth recording layers L1 to L3 are individually separated, and the molded resin substrate 1 is transferred.

  In this embodiment, the transfer film sheet 10 on which a laminated film such as a recording layer is formed is continuously transferred and peeled while being wound from a winding roll (not shown) to a winding roll. Can do. Then, the molded resin substrate 1 on which the first to fourth recording layers L0 to L3 are continuously formed can be formed by this transfer and peeling process.

  Finally, as shown in FIG. 11U, a hard coat material mainly composed of an ultraviolet curable resin is applied to the multilayer laminated film on the molded resin substrate 1 by a spin coating method, and then cured by irradiation with ultraviolet rays. Let As a result, the multilayer film from the second recording layer L1 to the fourth recording layer L3 and the end face for peeling off the cover layer 61 are protected by the protective layer made of the hard coat layer 71 that has been cured. Here, a multilayer optical disk recording medium is completed.

  When manufacturing a multilayer optical disk recording medium, the light intensity of the reproduction signal from the outermost surface on the reading side is required to be several percent of incident light, but the recording layer that is farthest from the reading side as the number of layers increases In order to increase the amount of signal from, it is required to increase the reflectance. Each layer is designed so that the amount of light reaching the outermost surface on the reading side is substantially the same. For this reason, in the method of laminating from the first recording layer as in the conventional method, for example, when the concave and convex shape is transferred with a nickel stamper and cured with ultraviolet rays from the back side, the light transmission Ultraviolet rays are irradiated from the low rate side. Therefore, when a nickel stamper is used in the conventional method, the efficiency is low due to the low light transmittance.

  In the present embodiment example, the recording layer is formed on the surface of the transfer film sheet 10 from the recording layer having a high light transmittance, that is, in the present embodiment example, from the fourth recording layer L3 side, that is, the high transmittance side of the configuration. It is possible to efficiently cure the ultraviolet rays from the back side of the transfer film sheet 10. For this reason, since light irradiation is possible from the back side of the transfer film sheet 10, a nickel stamper can be used. Since a nickel stamper that can be used repeatedly can be used instead of the transparent resin stamper that can be used only once, the cost can be reduced in the stamper process. Further, in this embodiment, the recording layer can be efficiently transferred even if a nickel stamper is used. Can be manufactured to quality.

  Further, since the nickel stamper can be used repeatedly, in the process of moving the transfer film sheet 10 from the unwinding roll 100 to the winding roll 105 as in the present embodiment, it is continuously uneven. A shape can be formed. For this reason, productivity is also improved and cost can be further reduced.

  In this embodiment, the first recording layer L0 is formed on the molded resin substrate 1, and then joined to the transfer film sheet 10 on which the second recording layer L1 to the fourth recording layer L3 are formed. The configuration. The present embodiment is not limited to this, and the first recording layer L0 may be formed on the transfer film sheet 10 side following the formation of the second recording layer L1. In this case, only the uncured spacer layer for use in bonding during transfer is formed on the molded resin substrate 1, and the transfer film sheet 10 in which the first to fourth recording layers L0 to L4 are formed. The upper laminated film may be transferred to the molded resin substrate 1.

  Furthermore, in this embodiment, the unwinding roll 100 and the winding roll 105 are separated into the respective laminated films, but it is also possible to make all the processes in-line and produce them in one flow.

[Second Embodiment]
16A and 16B show a schematic plan configuration showing an example of an apparatus used in the stamper process and a cross-sectional configuration thereof in the second embodiment of the present invention. 16A and 16B are different from FIGS. 4A and 4B in the configuration of the nickel stamper. 16A and 16B, parts corresponding to those in FIGS. 4A and 4B are denoted by the same reference numerals, and redundant description is omitted.

  In this embodiment, a nickel stamper 112 is formed on the transfer film sheet 10 on the side of the take-up roll 100 with respect to the roll 101 with a cup installed on the transfer film sheet 10. In this embodiment, the transfer film sheet 10 is unwound from the unwind roll 100 to the take-up roll 105, and the nickel stamper 112 is transferred while the transfer film sheet 10 is stationary. The ultraviolet curable resin layer 106 formed on the film sheet 10 is pressed. By doing so, a desired concavo-convex shape 106 a is transferred onto the upper surface of the ultraviolet curable resin layer 106.

  In this embodiment, since the nickel stamper 112 is pressed against the ultraviolet resin layer 106 in a stationary state, the transfer accuracy of the uneven shape 106a is improved.

  Also in the present embodiment example, an optical disk recording medium can be formed by the same process as in the first embodiment using the stamper process shown in FIGS. 16A and 16B. Also in this embodiment, the same effect as that of the first embodiment can be obtained.

  Although the present invention has been described as a method for producing a four-layer optical disc recording medium, it is obvious that the present invention is effective when there are three or more recording layers.

  The present invention is not limited to the write-once recording medium, and can also be applied to a method for manufacturing a rewritable or read-only optical disk recording medium.

  The manufacturing process of the multilayer optical disk recording medium of the present invention eliminates the use of a transparent stamper, and employs a nickel stamper that can be repeatedly used tens of thousands of times or more. As a process that can be used for a long period of time, it can be used as a process that can be used for a long time.

It is a schematic sectional block diagram (the 1) of the principal part of the optical disk recording medium formed in the 1st and 2nd embodiment of this invention. It is a schematic sectional block diagram (the 2) of the principal part of the optical disk recording medium formed in the 1st and 2nd embodiment of this invention. FIGS. 2A and 2B are a schematic plan configuration diagram showing a film forming process of the first embodiment of the present invention and a cross-sectional configuration diagram thereof. FIGS. FIGS. 2A and 2B are a schematic plan configuration diagram and a cross-sectional configuration diagram illustrating a stamper process according to the first embodiment of the present invention. FIGS. FIGS. 2A and 2B are a schematic plan configuration diagram and a cross-sectional configuration diagram showing a recording layer film forming process of the first embodiment of the present invention. FIGS. A, B, and C are manufacturing process diagrams (part 1) of an optical disc recording medium according to the first embodiment of the present invention. D, E, and F are manufacturing process diagrams (part 2) of the optical disc recording medium according to the first embodiment of the present invention. G, H, I are manufacturing process diagrams (part 3) of the optical disc recording medium according to the first embodiment of the present invention. FIG. J, K, and L are manufacturing process diagrams (part 4) of the optical disc recording medium according to the first embodiment of the present invention. P, Q, R, and S are manufacturing process diagrams (part 5) for the optical disc recording medium according to the first embodiment of the present invention. T, U are manufacturing process diagrams (No. 6) of the optical disc recording medium according to the first embodiment of the invention. It is a schematic plane block diagram which shows the notch part shape process of the 1st Embodiment of this invention in A and B, and its cross-sectional block diagram. FIGS. 2A and 2B are a schematic plan configuration diagram showing a peeling process and a cross-sectional configuration diagram thereof according to the first embodiment of the present invention. FIGS. A, B It is another schematic block diagram of the cutter used at the notch part formation process of the 1st Embodiment of this invention, and its cross-sectional block diagram. It is a schematic plane block diagram which shows the general specification of A and B BD, and the cross-sectional block diagram along the AA line. A, B It is a schematic plane block diagram which shows the stamper process of the 2nd Embodiment of this invention, and its cross-sectional block diagram. A to E are schematic manufacturing process diagrams of an optical disc recording medium in a conventional example.

Explanation of symbols

  1 .... Molded resin substrate, 4 .... Center hole, 10 .... Transfer film sheet, 12, 22, 32, 42 ... Reflective film, 13, 23, 33, 43 ... First dielectric film, 14, 24, 34, 44... Recording film, 15, 25, 35, 45... Second dielectric film, 61.. Cover layer, 71... Hard coat layer, 91, 92. , 53, 61a ... Spacer layer

Claims (4)

Preparing a flexible transfer film sheet supported by one roll and the other roll;
In the process of transferring the transfer film sheet from the one roll to the other roll, a step of continuously forming an ultraviolet curable resin layer on the transfer film sheet surface;
The ultraviolet curable resin layer formed on the surface of the transfer film sheet is pressed with a concavo-convex nickel stamper and simultaneously irradiated with ultraviolet rays from the back side of the transfer film sheet to cure the UV curable resin layer. , A step of continuously forming an uneven shape on the ultraviolet curable resin layer,
Forming a recording layer on the ultraviolet curable resin layer on which the uneven shape is formed;
After forming the recording layer, in the process of transferring the transfer film sheet from the one roll to the other roll, an ultraviolet curable resin layer is continuously formed on the transfer film sheet surface, and the transfer The ultraviolet curable resin layer formed on the surface of the film sheet is pressed against the nickel stamper having a concavo-convex shape, and at the same time, the ultraviolet curable resin layer is cured by irradiating the ultraviolet ray from the back surface of the transfer film sheet, thereby An uneven shape is continuously formed on the cured resin layer, and another recording layer having a light transmittance lower than that of the recording layer formed in the previous stage is formed on the ultraviolet curable resin layer on which the uneven shape is formed. Forming a film;
The step of forming the other recording layer is repeated a plurality of times as necessary to form a laminated film having a plurality of recording layers,
An optical disc recording medium manufacturing method including: After forming the plurality of laminated films,
Forming a notch for peeling in the laminated film;
Preparing a molded resin substrate having an ultraviolet curable resin layer formed on the surface;
On the laminated film formed on the transfer film sheet, the surface of the molded resin substrate on which the ultraviolet curable resin layer is formed is laminated, and at the same time, the ultraviolet curable resin layer is cured by ultraviolet irradiation, Transferring the laminated film on the transfer film sheet onto the molded resin substrate;
A method for producing an optical disk recording medium according to claim 1, further comprising: forming an ultraviolet curable resin layer serving as a protective layer on the laminated film transferred onto the molded resin substrate. The method of manufacturing an optical disk recording medium according to claim 2, wherein the recording layer and the other recording layer are formed at desired positions so as not to be exposed in the cutout section. The method for manufacturing an optical disk recording medium according to claim 1, wherein the nickel stamper presses the transfer film sheet having an ultraviolet curable resin layer formed on a surface thereof in a stationary state.

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