JP2010250894A - Optical disk, recording device, and recording method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk wherein information can be recorded even when the optical disk has an information recording layer exclusive for reproduction and information is not recorded by the conventional recording and reproducing device and to provide a recording device and a recording method for recording information in the optical disk. <P>SOLUTION: The optical disk 1 includes a first substrate 2 having a groove 3 formed on the upper surface thereof, a first information recording layer 4 provided on the first substrate 2, a second substrate 6 provided on the first information recording layer 4 and having a pit row 7 formed on the upper surface thereof, and a second information recording layer 8 provided on the second substrate 6. The first information recording layer 4 has information showing that the first information recording layer 4 is a layer exclusive for reproduction and the second information recording layer 8 has information showing that information can be recorded in the first information recording layer 4. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an optical disc having a plurality of information recording layers and a method for recording information on the optical disc.

  With the spread of thin large-screen TVs and the rise of multimedia, the handling of large volumes of information such as digital moving images is increasing, and the demand for larger capacity of optical disks is increasing. Currently, in addition to a CD (Compact Disc) having a capacity of about 650 MB (megabytes) and a DVD (Digital Versatile Disc) having a capacity of about 4.7 GB (gigabytes), a BD-ROM having a capacity of about 25 GB ( Blu-ray-Disc Read Only Memory) has been commercialized. Further, not only a single-layer BD-ROM having one information recording layer but also a two-layer BD having two stacked information recording layers having a capacity twice as large as that of a single-layer BD-ROM (about 50 GB). -ROM is also commercialized.

  A BD / DVD hybrid disc is disclosed in Patent Document 1. A BD / DVD hybrid disc is an optical disc in which a relatively high density BD-ROM information recording layer is laminated on a relatively low density DVD-ROM information recording layer. A standard-definition (SD) moving image is recorded on the DVD-ROM information recording layer, and a high-resolution (HD) high-definition (HD) moving image is recorded on the BD-ROM information recording layer. If a BD / DVD hybrid disc is distributed, HD moving images and SD moving images can be provided on a single optical disc.

  By the way, according to Non-Patent Document 1, various services using the Internet called BD-J (Blu-ray-Disc Java (registered trademark)) or “Blu-ray Disc Profile 2.0 (BD-LIVE)” have been studied. ing. For example, distribution of service information related to a movie recorded on a BD-ROM via the Internet after the movie is produced is being studied. Specific examples of service information include a trailer of a sequel to a movie, word-of-mouth information on the Internet, subtitles in languages other than those recorded in the BD-ROM, information on actors appearing, and the current state of the location, etc. It is.

JP 2007-184043 A JP 2006-209935 A

Illustrated Blu-ray Disc Reader Ohm Corporation 2006

  Since service information obtained via the Internet cannot be recorded on a reproduction-only optical disc, the service information can be used only by a device connected to the Internet. However, it is expected that even a device not connected to the Internet will be requested by the user to use service information distributed via the Internet.

  This requirement can be met by using a hybrid disc in which a BD-ROM is stacked on a DVD (recordable DVD) on which information can be recorded. Information can be recorded on a DVD. Therefore, after the service information is recorded on the recordable DVD, the service information may be overwritten with another information by the conventional DVD recording / reproducing apparatus, and the service information may be erased.

  The user desires to provide an optical disc that can record information even if it has a reproduction-only information recording layer and that does not allow the conventional recording / reproducing apparatus to record information. The user also desires to provide a recording device for recording information on such an optical disc.

  The present invention is capable of recording information even if it has a reproduction-only information recording layer, and is capable of recording information on a conventional recording / reproducing apparatus and recording information on the optical disc. It is an object of the present invention to provide a recording apparatus and a recording method that can perform recording.

  In order to solve the above problems and achieve the above object, an optical disc according to the present invention includes a first substrate having a groove formed on an upper surface thereof and a first information recording provided on the first substrate. Layer, a second substrate provided on the first information recording layer and having a pit row formed on an upper surface thereof, and a second information recording provided on the second substrate The first information recording layer has information indicating that the first information recording layer is a read-only layer, and the second information recording layer includes the first information recording layer. The information recording layer has information indicating that information can be recorded.

  The recording apparatus of the present invention includes an acquisition unit for acquiring first information, an optical disc having a first information recording layer and a second information recording layer, wherein the first information recording layer is the first information. A determination unit for determining whether or not second information indicating that recording is possible exists in the second information recording layer, and the first information recording layer stores the first information When the determination unit determines that the second information indicating that recording is possible exists in the second information recording layer, the first information acquired by the acquisition unit is used as the first information. And a recording unit for recording on the information recording layer.

  According to the recording method of the present invention, the first information recording layer obtains the first information from an optical disc having a step of obtaining first information and a first information recording layer and a second information recording layer. Determining whether or not second information indicating that recording is possible exists in the second information recording layer, and the first information recording layer records the first information. Recording the acquired first information in the first information recording layer when it is determined that the second information indicating that the second information is present in the second information recording layer. .

  The present invention is capable of recording information even if it has a reproduction-only information recording layer, and is capable of recording information on a conventional recording / reproducing apparatus and recording information on the optical disc. A recording apparatus and a recording method are provided.

It is the schematic of the cross section of the optical disk of this Embodiment. It is sectional drawing of the optical disk of this Embodiment for demonstrating a 1st information recording layer in detail. It is a figure for demonstrating the site | part in which the read-only flag and the recordable flag are provided. It is a block diagram of the recording / reproducing apparatus of this Embodiment. It is a flowchart which shows each step of operation | movement of the recording / reproducing apparatus of this Embodiment. It is a figure for demonstrating the manufacturing method of the optical disk of this Embodiment. 6 is a cross-sectional view of an optical disc of Example 2. FIG.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated with reference to drawings.

  First, the configuration of the optical disc 1 according to the present embodiment will be described with reference to FIGS. FIG. 1 is a schematic view of a cross section of an optical disc 1 according to the present embodiment. FIG. 2 is a cross-sectional view of the optical disc 1 of the present embodiment for explaining in detail the first information recording layer 4 constituting the optical disc 1 of the present embodiment.

  As shown in FIGS. 1 and 2, the optical disc 1 of the present embodiment includes a first substrate 2, a first information recording layer 4 provided on the first substrate 2, and a first information recording layer 4. Adhesive layer 5 provided on information recording layer 4, second substrate 6 provided on adhesive layer 5, and second information recording provided on second substrate 6 It has a layer 8 and a protective layer 9 provided on the second information recording layer 8.

  The first substrate 2 and the first information recording layer 4 correspond to a disc (hereinafter referred to as “recordable disc”) that can record information in conformity with the DVD standard. The second substrate 6 and the second information recording layer 8 correspond to a BD-ROM.

  The first substrate 2 is made of polycarbonate and has a diameter of 120 mm and a thickness of 0.6 mm. On the upper surface of the first substrate 2, a spiral groove 3 having a pitch of 0.74 μm from the inner periphery to the outer periphery is formed. The groove 3 conforms to the DVD standard and has a pre-address.

The first information recording layer 4 is a layer that is provided on the upper surface of the first substrate 2 and reflects the laser beam Lr for DVD. The first information recording layer 4 has information indicating that the first information recording layer 4 is a reproduction-only layer, for example, a reproduction-only flag. As shown in FIG. 2, the first information recording layer 4 includes a reflective film 41, a first dielectric film 42, a phase change recording film 43, and a second dielectric film 44, which are the first The first substrate 2 is laminated by sequentially sputtering. For example, the reflective film 41 is made of Ag, the first dielectric film 42 is made of ZnS—SiO ₂ , the phase change recording film 43 is made of chalcogenide-based GeAgInSbTe, and the second dielectric film 44 is ZnS—SiO _2. It is formed by. Note that the reproduction-only flag will be described later again with reference to FIG.

  The adhesive layer 5 is a layer that adheres the first information recording layer 4 and the second substrate 6.

  The second substrate 6 is a substrate conforming to the BD-ROM standard, and has a diameter of 120 mm and a thickness of 0.4 mm to 0.5 mm. On the upper surface of the second substrate 6, pit rows 7 conforming to the BD-ROM standard with a pitch of 0.32 μm are formed from the inner periphery toward the outer periphery.

  The second information recording layer 8 is a layer that transmits the laser beam Lr for DVD and reflects the laser beam Lb for BD, and the first information recording layer 4 can record information. It has information indicating that there is, for example, a recordable flag. The second information recording layer 8 is formed of, for example, a dielectric multilayer film. The thickness of the second information recording layer 8 is such that the transmittance for the laser beam Lr for DVD is 50% or more, and the laser beam Lb for BD is sufficiently reflected. Designed to. The recordable flag will be described again later with reference to FIG.

  The protective layer 9 is a layer such as an ultraviolet curable resin or a polycarbonate sheet, and the thickness thereof is determined so as to transmit 80% or more of the laser beam Lr for DVD and the laser beam Lb for BD.

  As shown in FIG. 1, information is recorded on the first information recording layer 4 by using a DVD objective lens Xr having an NA (numerical aperture) of 0.6 or 0.65. It is performed by collecting the information in one information recording layer 4. Information recorded on the first information recording layer 4 is reproduced by collecting the DVD laser light Lr on the first information recording layer 4 by the DVD objective lens Xr and processing the reflected light. The information recorded in the second information recording layer 8 is obtained by collecting the BD laser beam Lb on the second information recording layer 8 by the BD objective lens Xb with NA of 0.85 and processing the reflected light. Played.

  The second information recording layer 8 may be formed of a single material such as Si or a compound composed of Si and oxygen, nitrogen, carbon, hydrogen, or the like. If the second information recording layer 8 is formed of a single material, the manufacturing cost can be reduced.

  Further, the first substrate 2 and the first information recording layer 4 may be DVD-R, DVD-RW, DVD + R, DVD + RW, or DVD-RAM. In short, the first substrate 2 and the first information recording layer 4 only need to be compatible with a recordable disc compliant with the DVD standard.

  Next, the reproduction-only flag and the recordable flag will be described with reference to FIG. FIG. 3 is a diagram for explaining a portion where the reproduction-only flag and the recordable flag are provided, and the first information recording layer 4 and the second information recording layer 8 of the optical disc 1 of the present embodiment. FIG. In FIG. 3, an arrow P indicating the inner peripheral side of the optical disc 1 and an arrow Q indicating the outer peripheral side are displayed.

  As shown in FIG. 3, the first information recording layer 4 includes a power calibration zone 21, a management zone 22, and an order from the inner periphery side of the optical disc 1 indicated by the arrow P to the outer periphery side indicated by the arrow Q. It has a first lead-in zone 23, a first data recording zone 24, and a first lead outer zone 25.

  The power calibration zone 21 is a zone for executing power calibration, and the management zone 22 is a zone for managing the recording status of information in the first data recording zone 24. The first lead-in zone 23 is a zone provided with a reproduction-only flag indicating that the first information recording layer 4 is a reproduction-only layer. The reproduction-only flag can also be defined as a flag for prohibiting recording of information on the first information recording layer 4. The first data recording zone 24 is a zone where information is recorded, and the first read outer zone 25 is a zone indicating that it is the outer peripheral portion of the optical disc.

  As shown in FIG. 3, the second information recording layer 8 includes a second lead-in zone 61 and a second data recording layer in order from the inner peripheral side of the optical disc 1 indicated by the arrow P to the outer peripheral side indicated by the arrow Q. A zone 62 and a second lead outer zone 63 are provided.

  The second lead-in zone 61 is a zone provided with a recordable flag indicating that the first information recording layer 4 can record information. In the second lead-in zone 61, information indicating that the optical disc 1 has the first information recording layer 4, information recording conditions for the first information recording layer 4, and the like are recorded. The second data recording zone 62 is a zone where information is recorded, and the second read outer zone 63 is a zone indicating that it is the outer peripheral portion of the optical disc.

  As described above, the optical disc 1 of the present embodiment has the first information recording layer 4 corresponding to the recordable disc compliant with the DVD standard and the information provided on the first information recording layer 4. Is recorded in advance and has a second information recording layer 8 corresponding to a reproduction-only BD-ROM. The first information recording layer 4 is provided with a read-only flag, and the second information recording layer 8 is provided with a recordable flag.

  Therefore, in the conventional DVD recording / reproducing apparatus, even when the optical disc 1 of the present embodiment is inserted, the reproduction-only flag is provided in the first information recording layer 4. However, even if it is a layer that can actually record information, information is not recorded on the first information recording layer 4. That is, in the conventional DVD recording / reproducing apparatus, since the reproduction-only flag is provided in the first information recording layer 4, it is determined that the first information recording layer 4 is a ROM, and the first information recording layer 4 It only reproduces the information recorded in the.

  Next, the recording / reproducing apparatus 70 of the present embodiment for recording information on the first information recording layer 4 of the optical disc 1 of the present embodiment will be described with reference to FIG.

  First, the structure of the recording / reproducing apparatus 70 of this Embodiment is demonstrated using FIG. FIG. 4 is a configuration diagram of the recording / reproducing apparatus 70 of the present embodiment. As shown in FIG. 4, the recording / reproducing apparatus 70 of this embodiment includes an acquisition unit 71, a determination unit 72, a recording unit 73, a BD reproduction unit 74, and a DVD reproduction unit 75.

  The acquisition unit 71 acquires information via the Internet. The determination unit 72 determines whether or not a recordable flag is present in the upper information recording layer of the optical disc on which the two information recording layers are stacked. The recording unit 73 records information on the information recording layer below the optical disc on which the two information recording layers are stacked. The BD playback unit 74 plays back an information recording layer corresponding to the BD-ROM. The DVD playback unit 75 plays back an information recording layer corresponding to a recordable disc compliant with the DVD standard.

  Next, the operation of the recording / reproducing apparatus 70 of the present embodiment will be described with reference to FIG. FIG. 5 is a flowchart showing each step of the operation of the recording / reproducing apparatus 70 of the present embodiment.

  When the optical disc is inserted into the recording / reproducing apparatus 70, the determination unit 72 operates the BD reproducing unit 74 to acquire information from the information recording layer corresponding to the BD-ROM, and the inserted optical disc corresponds to the BD-ROM. It is determined whether or not information indicating that the information recording layer corresponding to the DVD is also present in the information recording layer corresponding to the BD-ROM below (back) the information recording layer (S1). When there is no information indicating that the optical disc has the lower information recording layer (No in S1), the BD reproducing unit 74 reproduces information recorded on the information recording layer corresponding to the BD-ROM. Then (S2), the operation of the recording / reproducing apparatus 70 of the present embodiment ends.

  On the other hand, when there is information indicating that the optical disk has the lower information recording layer (Yes in S1), the determination unit 72 has a recordable flag in the information recording layer corresponding to the upper BD-ROM. It is determined whether or not (S3). When the recordable flag does not exist (No in S3), the BD reproducing unit 74 reproduces information recorded in the upper information recording layer (S2), and the operation of the recording / reproducing apparatus 70 of the present embodiment. Ends.

  On the other hand, when the recordable flag exists in the upper information recording layer (Yes in S3), the BD reproducing unit 74 sets the recording condition of the lower information recording layer recorded in the upper information recording layer. The DVD playback unit 75 plays back information in the management zone of the lower information recording layer. Then, the recording unit 73 acquires the recording condition and the information recording state in the first data recording zone, and executes power calibration (S4). The acquisition unit 71 acquires information via the Internet (S5), and the recording unit 73 records the information acquired by the acquisition unit 71 in the first data recording zone of the lower information recording layer (S6).

  If the optical disc inserted in the recording / reproducing apparatus 70 of the present embodiment is the optical disc 1 of the present embodiment, the optical disc 1 has a recordable flag in the second information recording layer 8 which is the upper information recording layer. Therefore, even if a read-only flag is provided in the first information recording layer 4, the recordable flag is prioritized over the read-only flag, and information is recorded in the first information recording layer 4.

  As described above, the optical disc 1 according to the present embodiment has the second information recording layer 8 corresponding to the BD-ROM and the first information recording layer 4 capable of recording information. Although information can be recorded on the first information recording layer 4, the first information recording layer 4 has a reproduction-only flag, so the conventional DVD recording / reproducing apparatus has the first information recording. No information is recorded on the layer 4. The conventional DVD recording / reproducing apparatus only reproduces information recorded on the first information recording layer 4.

  In the recording / reproducing apparatus 70 of the present embodiment, since the recordable flag exists in the second information recording layer 8, information is recorded on the first information recording layer 4 of the optical disc 1 of the present embodiment. can do. For example, the recording / reproducing apparatus 70 of this embodiment can record service information obtained via the Internet in the first information recording layer 4. Since the conventional DVD recording / reproducing apparatus only reproduces the information recorded on the first information recording layer 4, the service information recorded on the first information recording layer 4 is transmitted by the conventional DVD recording / reproducing apparatus. It will not be erased. Even if the conventional DVD recording / reproducing apparatus is not connected to the Internet, the service information is reproduced, so that the user can view the service information.

  Therefore, the service information related to the information such as the movie recorded in the second information recording layer 8 corresponding to the BD-ROM is stored in the first information by the optical disc 1 of the present embodiment and the recording / reproducing apparatus 70 of the present embodiment. In addition to being able to record on one information recording layer 4, a conventional DVD recording / reproducing apparatus can satisfy a user's request to execute only reproduction of information recorded on the first information recording layer 4.

  Note that the conventional DVD recording / reproducing apparatus also includes a conventional DVD recording apparatus, and if a reproduction-only flag exists in the information recording layer on which information is to be recorded, the information recording layer includes information. It is only recorded and not recorded.

  The first information recording layer 4 is not limited to the information recording layer of a recordable disc compliant with the DVD standard, but may be an information recording layer of a recordable disc compliant with the BD standard. The second information recording layer 8 is not limited to the BD-ROM information recording layer but may be a DVD-ROM information recording layer. In short, the first information recording layer 4 may be an information recording layer capable of recording information, and the second information recording layer 8 may be an information recording layer dedicated to reproduction. In any case, the first information recording layer 4 has information indicating that the first information recording layer 4 is a reproduction-only layer, and the second information recording layer 8 includes the first information recording layer 4. The information recording layer 4 has information indicating that information can be recorded.

  Further, the recording unit 73 of the recording / reproducing device 70 of the present embodiment once records the information acquired by the acquiring unit 71 in a recording area (not shown) of the recording / reproducing device 70, and then the optical disc 1 of the present embodiment. The first information recording layer 4 may be recorded.

  Below, the Example of the optical disk 1 and its manufacturing method is described.

  First, the optical disk of Example 1 will be described together with its manufacturing method.

  The optical disc of Example 1 has a first information recording layer 4 and a second information recording layer 8. These manufacturing processes will be described in order, and thereby the optical disk of Example 1 and the manufacturing method thereof will be described.

  First, the manufacturing process of the first information recording layer 4 will be described.

  First, a glass master having a thickness of 5 mm and a diameter of 200 mm was polished with ultrapure water and cerium oxide, and then washed. Then, a photoresist containing a cresol novolac resin and a benzophenone ester is uniformly applied on the glass master disk with an adhesive agent at a thickness of about 1/15 of the wavelength of the laser beam Lr for DVD by spin coating. did. The photoresist may be either a positive type or a negative type, but a positive type photoresist was used in Example 1.

  Thereafter, the glass master coated with the photoresist was baked by a hot plate at a temperature of 60 ° C. to 80 ° C. to evaporate the organic solvent adhering to the glass master. Baking may be performed in a thermostatic bath.

  Next, the wavelength below the UV region from the laser beam recorder so that a convex groove corresponding to the pre-address converted into information determined by the DVD standard is formed in a spiral shape at a pitch of 0.74 μm. The photoresist was exposed to light and exposed to light. At this time, in order to recognize that the first information recording layer 4 is a DVD-ROM, Byte Positions 0 of the Physical format information zone in the embossed area of the lead-in portion where the disc format information of the inner circumference of the optical disc is recorded. The photoresist was exposed and exposed to light so that the book type flag of “DVD-ROM” indicates. The book type indicates information for identifying the type of media.

  And the exposed part was removed with the alkali developing solution, and the 1st glass master was obtained. On the surface of the first glass master, a concave groove corresponding to the pre-address and a concave portion for indicating the “DVD-ROM” were formed.

  Next, a conductive film such as nickel was formed on the first glass master photoresist by sputtering, and nickel was plated using the conductive film as an electrode. Accordingly, the concave groove formed in the photoresist and the concave pattern for indicating “DVD-ROM”, and the convex groove corresponding to the pre-address and the convex for indicating “DVD-ROM” are shown. The features were copied onto the plated nickel layer.

  Next, the nickel layer was peeled from the first glass master to form a first master stamper. Then, the first master stamper is subjected to electrolytic treatment or the like to peel off the oxide, and then plated with nickel, and the concave groove having the reverse shape to the groove formed on the first master stamper and the “DVD-ROM” As a result, a first mother stamper having a concave portion for indicating "" was obtained.

  Next, the first mother stamper was attached to the mold and the polycarbonate resin was injection-molded to obtain the first substrate 2 having an optical disk thickness of 0.6 mm shown in FIGS. When the first substrate 2 was obtained, a convex groove 3 conforming to the DVD-ROM standard was formed on the surface of the first substrate 2. In addition, a convex read-only flag indicating “DVD-ROM” is formed in the embossed area of the lead-in portion where the disc format information on the inner periphery of the surface of the first substrate 2 is recorded.

  Next, the reflective film 41, the first dielectric film 42, the phase change recording film 43, and the second dielectric film 44 are sequentially sputtered on the first substrate 2 on which the groove 3 and the reproduction-only flag are formed. Thus, the first information recording layer 4 was formed. Then, the first information recording layer 4 was crystallized using an initialization device manufactured by Hitachi CP. The first information recording layer 4 has a function equivalent to that of DVD-RW.

The reflective film 41 was formed using Ag and its thickness was 70 nm. The reflective film 41 is preferably formed using an alloy containing 95% or more of Ag. The first dielectric film 42 was formed using ZnS—SiO ₂ and had a thickness of 15 nm. The phase change recording film 43 is formed using chalcogenide-based GeAgInSbTe and has a thickness of 15 nm. The second dielectric film 44 was formed using ZnS—SiO ₂ and had a thickness of 70 nm.

  Subsequently, a manufacturing process of the second information recording layer 8 will be described.

  First, a glass master having a thickness of 5 mm and a diameter of 200 mm was polished with ultrapure water and cerium oxide, and then washed. Then, a photoresist containing a cresol novolac resin and a benzophenone ester is uniformly applied to the glass master with a thickness of about 1/6 of the wavelength of the laser beam Lb for BD by an spin coat method through an adhesive. did. The photoresist may be either a positive type or a negative type, but a positive type photoresist was used in Example 1.

  Thereafter, the glass master coated with the photoresist was baked by a hot plate at a temperature of 60 ° C. to 80 ° C. to evaporate the organic solvent attached to the glass master. Baking may be performed in a thermostatic bath.

  Next, in order to later obtain 1-7PP modulated information determined by the BD-ROM standard, a pit having a minimum pit length of 0.15 μm is 0.32 μm on a photoresist on a baked glass master. The photoresist was exposed and exposed to light having a wavelength below the UV region from a laser beam recorder so as to be formed in a spiral shape with a pitch of. At this time, the photoresist is exposed so that a recordable flag for recognizing that the first information recording layer 4 can record information can be obtained later in the lead-in portion of the second information recording layer 8. Sensitized.

  Then, the exposed portion was removed with an alkaline developer to obtain a second glass master in which concave portions corresponding to concave pits and recordable flags were formed.

  Next, a conductive film such as nickel was formed on the second glass master photoresist by sputtering, and nickel was plated using the conductive film as an electrode. As a result, pits formed by convex wobbles or the like, which are reverse patterns of the concave pits formed in the photoresist, and convex portions corresponding to the recordable flag were copied onto the plated nickel layer.

  Next, the nickel layer was peeled from the second glass master to form a second master stamper. Then, the second master stamper is subjected to electrolytic treatment or the like to peel off the oxide, and then nickel is plated, so that the shape corresponding to the pit and recordable flag formed on the second master stamper is reversed. Thus, a second mother stamper having a concave portion corresponding to the recordable flag and a concave portion corresponding to the recordable flag was obtained.

  Then, the second mother stamper is plated with nickel, and the second baby is formed with a convex pit having the same shape as the pit of the second master stamper and a convex portion corresponding to the recordable flag. I got a stamper.

  Next, a second baby stamper was attached to the mold, and polycarbonate resin was injection molded to obtain a second substrate 6 having a thickness of 0.48 mm. When the second substrate 6 was obtained, concave pit rows 7 which were pits conforming to the BD-ROM standard were formed on the surface of the second substrate 6. In addition, a concave recordable flag was formed on the surface of the second substrate 6. Note that the second substrate 6 can also be obtained by using the second master stamper instead of the second baby stamper.

  A second information recording layer 8 was formed on the second substrate 6. Specifically, the second substrate 6 is placed in the chamber, and argon and hydrogen gas are supplied to the chamber and Si is sputtered to form Si and hydrogen on the second substrate 6 with a thickness of 10 nm. The second information recording layer 8 was formed by depositing a compound with (H). The reflectance of the second information recording layer 8 with respect to light having a wavelength of 405 nm was 17%, and the transmittance of light having a wavelength of 650 nm was 88%.

Note that the second information recording layer 8 may be formed as follows. That is, even if the second information recording layer 8 is formed on the second substrate 6 by performing sputtering in vacuum using Si, SiO ₂ , SiN, SiC, TiO ₂ , or ZnS—SiO _2. Good. At this time, the thickness of the second information recording layer 8 is designed so that the reflectance with respect to light with a wavelength of 405 nm is 12% or more and the transmittance with respect to light with a wavelength of 405 nm is 50% or more.

  Then, on the second information recording layer 8, a protective layer composed of a sheet of polycarbonate resin or the like having a transmittance of 85% or more with respect to the laser beam Lr for DVD and the laser beam Lb for BD and an adhesive material 9 is formed with a thickness of 100 μm. The transmittance of the protective layer 9 with respect to the laser beam Lr for DVD and the laser beam Lb for BD is desirably 90% or more.

  Finally, the first substrate 2 on which the first information recording layer 4 is formed and the second substrate 6 on which the second information recording layer 8 is formed are bonded together as shown in FIG. . That is, the surface of the first substrate 2 on which the first information recording layer 4 is formed and the surface of the second substrate 6 on which the protective layer 9 is not attached are opposed to each other. The board | substrate 2 and the 2nd board | substrate 6 were bonded together using the adhesive sheet. Thereby, the manufacture of the optical disk of Example 1 was completed. FIG. 6 is a diagram for explaining a method of manufacturing the optical disc according to the present embodiment. The pressure-sensitive adhesive sheet is to become the adhesive layer 5 later.

  The total thickness of the second substrate 6, the adhesive sheet, and the protective layer 9 is desirably 0.6 mm. This is because the thickness of the conventional DVD and BD is 1.2 mm, the thickness of the optical disk of Example 1 is preferably 1.2 mm, and the thickness of the first substrate 2 is 0.6 mm. Because. In Example 1, since the thickness of the 2nd board | substrate 6 is 0.48 mm and the thickness of the protective layer 9 is 0.1 mm, the thickness of the adhesive sheet was 0.02 mm.

  The first information recording layer 4 is crystallized by the initialization device after the first information recording layer 4 is formed on the first substrate 2 and then the first substrate 2 and the second substrate 6. However, it may be performed after the first substrate 2 and the second substrate 6 are bonded to each other.

  In the optical disc of Example 1 manufactured by the method described above, the reflectance of the second information recording layer 8 with respect to light having a wavelength of 405 nm was 17%. Further, the reflectance of the first information recording layer 4 with respect to light having a wavelength of 650 nm was 19%, which satisfied the reflectance standard of DVD-RW from 18% to 30%.

  With a DDU-1000 manufactured by Pulstec Corp. having a laser beam wavelength of 658 nm and an objective lens numerical aperture (NA) of 0.6, the recording speed is 14 m / s, which is four times the normal recording speed of DVD, When information was recorded on the first information recording layer 4 of the optical disk of Example 1 with a laser beam having a recording power of 25 mW and then reproduced with a laser beam having a reproduction power of 0.7 mW, a jitter of 7% was obtained. It was.

  Further, since the second information recording layer 8 satisfies the BD-ROM standard except for the reflectance, and the reflectance is clear of the DVD-RW standard, the optical disc of Example 1 is DVD-RW. The data was reproduced normally by a commercially available BD-ROM reproducing device capable of reproducing.

  Furthermore, the information of each flag recorded in the lead-in of the first information recording layer 4 and the second information recording layer 8 was also read without any problem.

  Next, the optical disk of Example 2 will be described with reference to FIG. FIG. 7 is a cross-sectional view of the optical disc of Example 2.

  The manufacturing method and the configuration of the optical disc of the second embodiment are almost the same as those of the optical disc of the first embodiment, but differ in several points. In the following description, differences from the first embodiment will be mainly described.

  In the optical disc of Example 2, the book type of the lead-in portion of the first substrate 2 is DVD-ROM.

The first information recording layer 4 was created as follows. First, a reflective layer 45 was formed by depositing Ag on the surface of the first substrate 2 on which the groove 3 is present by sputtering. Next, a cyanine dye having a maximum absorption wavelength of 585 nm (manufactured by Hayashibara Biochemical Laboratories: trade name S06-DX001) is dissolved in tetrafluoropropanol to form a 1.0 wt% solution, and the reflective layer 45 is formed by spin coating. The recording layer 46 was formed by coating on the top. Subsequently, the protective layer 47 was formed by sputtering ZnS—SiO _2, and the first information recording layer 4 having a thickness of 30 nm was formed.

  In Example 2, the crystallization process of the first information recording layer 4 performed in Example 1 was not performed because it was unnecessary.

  A hybrid recognition flag indicating that the first information recording layer 4 which is a DVD-R exists in the disc information portion of the lead-in portion of the second information recording layer 8 was recorded.

  In the optical disc of Example 2, the reflectance of the second information recording layer 8 with respect to light having a wavelength of 405 nm was 12%. Further, the reflectance of the first information recording layer 4 with respect to light having a wavelength of 650 nm was 47%, which satisfied the DVD-ROM reflectance standard.

  With a DDU-1000 manufactured by Pulse Tech Co., which has a laser beam wavelength of 658 nm and an objective lens numerical aperture (NA) of 0.6, the recording speed is 14 m / s, which is four times the normal recording speed of DVD, When information was recorded on the first information recording layer 4 of the optical disc of Example 2 with a laser beam having a recording power of 20 mW and then reproduced with a laser beam having a reproduction power of 0.7 mW, a jitter of 7% was obtained. It was.

  Further, the second information recording layer 8 satisfied the BD-ROM standard and was normally reproduced by a commercially available BD-ROM reproducing device.

  Furthermore, the information of each flag recorded in the lead-in portions of the first information recording layer 4 and the second information recording layer 8 was also read without any problem.

  Next, the optical disk of Example 3 will be described.

  The manufacturing method and the configuration of the optical disc of the third embodiment are almost the same as those of the optical disc of the first embodiment, but differ in several points. In the following description, differences from the first embodiment will be mainly described.

  In the optical disk of Example 3, the wobble frequency of the groove having the pre-address information of the first substrate 2 is 408 KHz, which is different from the frequency 817 KHz of the normal DVD + RW, in order to avoid malfunction by the conventional DVD recording apparatus. The book type of the lead-in portion of the first substrate 2 is DVD + RW.

  Further, in the optical disk of Example 3, finalization processing for prohibiting writing as the logic of DVD + RW was performed so that the first information recording layer 4 was handled as a DVD-ROM. That is, dummy data was recorded in an ECC block for 1 GB in an area up to a diameter of 70 mm in the data zone, and data “0” was recorded in the lead-out portion of the first information recording layer 4. In addition, information prohibiting the recording of information on the first information recording layer 4 was also recorded on the second information recording layer 8 of the second substrate 6.

  In the optical disk of Example 3, the reflectance of the second information recording layer 8 with respect to light having a wavelength of 405 nm was 13%. The reflectance of the first information recording layer 4 with respect to light having a wavelength of 650 nm was 19%, which satisfied the reflectance standard of DVD + RW from 18% to 30%.

  With a DDU-1000 manufactured by Pulse Tech Co., which has a laser beam wavelength of 658 nm and an objective lens numerical aperture (NA) of 0.6, the recording speed is 14 m / s, which is four times the normal recording speed of DVD, When information was recorded on the first information recording layer 4 of the optical disc of Example 3 with a laser beam having a recording power of 27 mW and then reproduced with a laser beam having a reproduction power of 0.7 mW, a jitter of 7% was obtained. It was.

  Further, the optical disk of Example 3 was normally reproduced by a commercially available BD-ROM reproducing apparatus capable of reproducing DVD + RW.

  Furthermore, the information of each flag recorded in the lead-in portions of the first information recording layer 4 and the second information recording layer 8 was also read without any problem.

  The first information recording layer 4 is crystallized by the initialization device after the first information recording layer 4 is formed on the first substrate 2 and then the first substrate 2 and the second substrate 6. It went before bonding.

  Further, data to be recorded by downloading from the Internet to the first information recording layer 4 is recorded by overwriting on 1 GB dummy data.

  The SD moving image having the same content as the HD quality moving image recorded on the second information recording layer 8 of the optical discs of the first, second, and third embodiments described above is downloaded from the Internet. By recording on the information recording layer 4, it is possible to easily produce an optical disc on which the same content having a different resolution is recorded. The optical disk can be played back by a DVD playback device. In addition to content downloaded from the Internet, the user can add data to the first information recording layer 4. Further, the user can update the data in the first information recording layer 4.

  DESCRIPTION OF SYMBOLS 1 Optical disk, 2 1st board | substrate, 3 Groove, 4 1st information recording layer, 5 Adhesion layer, 6 2nd board | substrate, 7 Pit row, 8 2nd information recording layer, 9 Protective layer, 70 Recording / reproducing apparatus 71 acquisition unit, 72 determination unit, 73 recording unit, 74 BD playback unit, 75 DVD playback unit.

Claims (3)

A first substrate having a groove formed on the upper surface;
A first information recording layer provided on the first substrate;
A second substrate provided on the first information recording layer and having a pit row formed on the upper surface;
A second information recording layer provided on the second substrate,
The first information recording layer has information indicating that the first information recording layer is a read-only layer;
The second information recording layer has information indicating that the first information recording layer is capable of recording information. An acquisition unit for acquiring first information;
From an optical disc having a first information recording layer and a second information recording layer, second information indicating that the first information recording layer can record the first information is the first information. A determination unit for determining whether or not the information recording layer exists in the second information recording layer;
When the determination unit determines that the second information indicating that the first information recording layer is capable of recording the first information is present in the second information recording layer, the acquisition is performed. And a recording unit that records the first information acquired by the unit on the first information recording layer. Obtaining first information;
From an optical disc having a first information recording layer and a second information recording layer, second information indicating that the first information recording layer can record the first information is the first information. Determining whether it exists in the information recording layer 2;
When it is determined that the second information indicating that the first information recording layer is capable of recording the first information is present in the second information recording layer, the acquired first information Recording information on the first information recording layer.

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