JP2023117504A - Optical information recording medium and optical recording and playback device - Google Patents

Abstract

To provide an optical information recording medium with high recording density having an information layer showing favorable signal quality.SOLUTION: An optical information recording medium which has a plurality of (two or more) information layers superposed on each other and records data into the information layers and plays back the data from the information layers through laser light irradiation is characterized by: having BCA for recording specific information related to the aforementioned optical information recording medium; having at least one of the information layers having a guide groove formed of a concave and convex shape, in which the guide groove has a Groove track on a convex side and a Land track on a concave side when viewed from a laser light incident side; and previously recording groove recording order information indicating whether or not to record data into the BCA from the Groove track or from the Land track upon recording the data into both the Groove track and the Land track.SELECTED DRAWING: Figure 9

Description

The present disclosure relates to a high-density optical information recording medium and an optical recording/reproducing apparatus for recording or reproducing information by optical means.

Digital data such as audio, video, and moving images generated from Internet-connected devices is rapidly increasing with the development of network environments and the improvement of computer processing speeds.

Optical discs, which are optical information recording media, have so far evolved into CDs (Compact Discs), DVDs (Digital Versatile Discs), and BDs (Blu-ray (registered trademark) Discs). In BD, the BD-XL standard was formulated in June 2010, and a three-layer disc (optical disc with three information layers) conforming to this standard has a recording capacity of 33.4 gigabytes (GB) per information layer. and has a recording capacity of 100 GB on one side. As the next standard after the BD-XL standard, the professional optical disc standard "Archival Disc" was established in March 2014 (see, for example, Non-Patent Document 1). Archival discs use a land-and-groove recording method to achieve a higher recording density than BDs. The roadmap for archival disc standards has been formulated to gradually increase the recording capacity per disc. It is planned to develop a 1TB system as the third generation.

The second generation archival disc with a capacity of 500 GB is capable of recording and reproducing 500 GB of information per disc by providing three-layer discs capable of storing 250 GB of information on both sides of the substrate. In order to realize the third generation archival disc with 1 TB capacity, it is necessary to increase the recording capacity of one side to 500 GB.

In order to increase the recording capacity, the track pitch of the 1TB capacity archival disc is narrowed. Therefore, when reproducing the signal, the signals of the adjacent tracks on both sides are also used to cancel noise. 3-track crosstalk cancellation A method (3Track Cross Talk Cancel: 3Trk-XTC, see, for example, US Pat. No. 6,300,000) is introduced.

Also, the signals to be recorded vary from binary recording of 0 and 1 consisting of a recorded state and unrecorded state to multi-valued recording of three or more values in which mark levels are assigned in the depth direction of recording (see, for example, Patent Document 1). )become. There is also a technique for increasing the number of information layers per side from three to four (for example, see Patent Document 3). Through these efforts, the signal density per disc will be increased, and a capacity of 500 GB per side and 1 TB per disc will be realized.

WO2020/100777 WO2021/145016 WO2007/099835

Archival Disc White Paper: Archival Disc Technology 1st Edition July 2015

Although the recording capacity has increased due to narrower track pitches and multi-level recording signals, it has become difficult to ensure high signal quality, and it is required to record signals under optimal conditions for each layer. When performing 3Trk-XTC, it is known that the quality of the reproduced signal differs depending on which groove polarity, the adjacent Groove track or the Land track, the signal is recorded first. It is preferable to optimize the recording order for each media layer (information recording layers L0, L1, L2, and L3 in the case of a four-layer disc). Groove tracks refer to tracks on the convex side when viewed from the laser incident side in guide grooves formed of uneven shapes in the information layer, and tracks on the concave side are land tracks.

Here, crosstalk is defined as leakage of signals from adjacent tracks (adjacent lands if the track for signal reproduction is Groove). For example, in an optical pickup using an optical system using an objective lens with a wavelength λ of 405 nm and a numerical aperture NA of 0.91, the focal spot size ranges from 1.22 λ/NA to approximately 543 nm, and the track pitch is 0.91 nm. When reproducing a signal recorded in the groove on an information recording medium having grooves of 18 μm, the light spot spreads to both adjacent lands, and the signal recorded in the land becomes a noise component, which leaks into the reproduced signal of the groove. come. This leakage is the same even when the track pitch of the conventional archival disk is 0.225 μm, but the leakage increases remarkably as the track pitch becomes narrower.

Also, when a tungsten oxide-based material, which is a material with excellent long-term storage stability, is used for the recording film for archive disc applications, the recording mechanism of this recording film is a mode in which large oxygen bubbles are generated in the recording film to form marks. Therefore, the recording film spreads in the track direction, and crosstalk tends to deteriorate.

As a means for solving this problem, the conventional 3Trk-XTC method, which reproduces not only the track to be reproduced but also both adjacent tracks and removes the crosstalk noise component from the information by signal processing, is useful. .

Therefore, the signal quality of the track to be reproduced and its both adjacent tracks is important, and it is known that the signal quality of the track to be reproduced and its both adjacent tracks is affected by the recording order. ing. For example, if Groove is to be played back, and the Groove is recorded first, and then the Land is recorded later, the Groove recorded earlier is affected by the Land recording, and the signal quality tends to deteriorate more easily than the Land recorded later. be. If the signal quality of the Groove at that time is better than that of the Land, the recording order may be used. However, if the signal quality is worse than that of the Land, it may be better to record the Land first and then record the Groove.

Conventional archival discs are reproduced using only waveforms from tracks to be reproduced (one-beam reproduction). Since the previously recorded signal is affected when the subsequently recorded signal is recorded, the reproduction signal quality of the previously recorded groove polarity deteriorated in one-beam reproduction. Since this is the same whether recording is performed from the Groove track first or from the Land track, the recording order of the groove polarities can be uniquely determined. However, when performing 3Trk-XTC, the track to be reproduced and its adjacent tracks, that is, the reproduction signals of both groove polarities are used. difficult to determine unambiguously.

The influence of land/groove and crosstalk depends on the groove shape (groove depth and land/groove ratio) and the material of the resin and film forming the disk. Also, the groove shape and resin/film material are different for each media layer. Therefore, the land/groove signal quality when the groove is first recorded and the land/groove signal quality when the land is first recorded depend on the groove shape and film material. Therefore, it is very important and effective to optimally select whether to record Groove first or Land first according to the medium in order to achieve high playback signal quality.

It is also possible to directly add information about the recording order to the stamper. In conventional archival discs, the stampers to be used are separated for each layer, and stampers designated for each layer are used. If a stamper common to each layer can be used, an improvement in productivity can be expected. In this case, if information about the recording order is given to the stamper, the recording order is fixed depending on the stamper used. Which of the Groove track and the Land track is recorded first to obtain higher reproduced signal quality is not determined only by the parameters of the stamper, but differs depending on the hardness and film material of the sandwiched resin layers. Therefore, if the recording order is determined by the stamper, there is a possibility that an appropriate recording order will not be selected.

BCA (Burst Cutting Area) information is a read-only area recorded in advance at the time of shipment of the disc. If information about the recording order is added to the BCA of the disc, recording can be performed in the optimum recording order specified by the disc manufacturer for each layer on any medium. Therefore, the present disclosure provides a method of realizing high signal quality by adding information about the recording order for each layer to the BCA of the disc.

An optical information recording medium according to the present disclosure has a plurality of information layers in which two or more layers are laminated, and records data in the information layers by irradiating laser light and reproduces data from the information layers. , a BCA for recording unique information about the optical information recording medium, and at least one of the information layers has a guide groove having an uneven shape, and the guide groove has a groove track on the convex side when viewed from the incident side of the laser beam. When data is recorded on both the Groove track and the Land track with the concave side as the Land track, groove recording order information indicating whether the data is to be recorded from the Groove track or from the Land track is recorded in advance in the BCA. It is characterized by

An optical information recording medium according to an embodiment of the present invention has an information layer exhibiting good signal quality, and enables realization of an optical information recording medium with a high recording density.

FIG. 2 is a top view of the optical information recording medium according to the present embodiment; FIG. 2 is a diagram showing a radial area from the center of the optical information recording medium and the tracking direction in the present embodiment; Cross-sectional view of the optical information recording medium in the present embodiment Schematic diagram showing the structure of the intermediate resin layer of the optical information recording medium in the present embodiment. Schematic diagram showing the configuration of the L0 layer Schematic diagram showing the configuration of the L1 layer Schematic diagram showing the configuration of the L2 layer Schematic diagram showing the configuration of the L3 layer Diagram for explaining the breakdown of information recorded in the BCA FIG. 1 is a block diagram showing the configuration of an optical recording/reproducing device according to this embodiment; Flowchart from BCA reading to completion of recording A diagram showing an example of adding information about recording order in BCA Diagram showing the expected waveform of the playback signal and the expected waveform of the recording A diagram showing a recording pulse and a recording state based on the recording expected waveform. A diagram showing a reproduced signal in which recording is detected based on the expected recording waveform. Diagram showing how to record each track from the Land track A diagram for explaining a method of recording each small block in order from the land track. A diagram for explaining a method of recording each small block in order from the Groove track. Flowchart from BCA reading to completion of recording using information on the recording order recorded in the optical recording/reproducing device A diagram showing an example of the relationship between the track arrangement, the recording order, the track arrangement identifier, and the track arrangement information in the case of the L0 layer and the L2 layer. A diagram showing an example of the relationship between the track arrangement, the recording order, the track arrangement identifier, and the track arrangement information in the case of the L1 layer and the L3 layer. Diagram showing an example of disk usage information

Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed description than necessary may be omitted. For example, detailed descriptions of well-known matters and redundant descriptions of substantially the same configurations may be omitted. This is to avoid unnecessary verbosity in the following description and to facilitate understanding by those skilled in the art. It should be noted that the accompanying drawings and the following description are provided for a thorough understanding of the present disclosure by those skilled in the art and are not intended to limit the claimed subject matter.
(Embodiment)
A multilayer information recording medium according to an embodiment of the present invention will be described below with reference to the drawings.
[1. Configuration of optical information recording medium]
First, the optical information recording medium 100 in this embodiment will be described.

The main optical conditions are a laser with a wavelength of 405 nm and an objective lens with NA=0.91. The disc structure has a track pitch of 0.18 μm, a groove depth of 25 nm to 35 nm, and a thickness from the laser incident surface to the information surface of approximately 50.5 μm to 106.5 μm. A multi-layer, double-sided bonded optical disk medium having a recording capacity of 125 GB per layer will be described as an example. The writing speed is a linear velocity of 15.63 m/s. This linear velocity is an example, and is not limited only to this condition.

FIG. 1 is a top view of an optical information recording medium 100 according to this embodiment. FIG. 2 is a diagram showing areas in the radial direction from the center of the optical information recording medium 100 and tracking directions. FIG. 3 is a cross-sectional view of the optical information recording medium 100. As shown in FIG.

As shown in FIG. 3, the optical information recording medium 100 is a double-sided optical information recording medium in which an A-side optical information recording medium 110 and a B-side optical information recording medium 111 are bonded together. The A-side optical information recording medium 110 and the B-side optical information recording medium 111 each include an L0 layer 116, an L1 layer 117, and an L2 layer, which are sequentially laminated as information layers on a substrate 112 via intermediate layers 113, 114, and 115. It has a layer 118 and an L3 layer 119 and a cover layer 120 is provided on the L3 layer 119 . The A-side optical information recording medium 110 and the B-side optical information recording medium 111 are formed by bonding the back surfaces of their substrates 112 (the side opposite to the side having the information layer). The information recording medium 111 can be recorded and reproduced at the same time. In the A-side optical information recording medium 110 and the B-side optical information recording medium 111, the direction of the spiral of each information layer may be opposite or the same when viewed from the laser irradiation side.

As shown in FIG. 1, an inner zone 104, a data area 101, and an outer zone 105 are arranged from the inner peripheral side as planar areas of the optical information recording medium 100 of the present embodiment. The inner zone 104 has a BCA 102 and a recordable area 103 . The inner zone 104 is positioned inside about 24 mm from the center of the optical information recording medium 100 . The BCA 102 is a read-only area in which a unique ID or the like specific to the medium is recorded at a position 21 mm to 22.2 mm from the center of the optical information recording medium 100 by laser irradiation or the like with a predetermined length at the time of shipment. The BCA 102 forms record data in the form of barcodes by forming record marks so as to be arranged concentrically. Some BCAs 102 record using a width of 0.7 mm, while others record using a width of 0.2 mm, although this disclosure is not limited to either.

A recordable area 103 is a recordable area provided at a position of 22.2 mm to 24 mm from the center of the optical information recording medium 100, and is provided with a learning area for trial recording and a defect management area (DMA). The learning area is used to calibrate changes in the recording power and recording pulse conditions when the optical information recording medium 100 is inserted into the optical recording/reproducing apparatus and when the temperature fluctuates greatly during operation. A test recording is made. The defect management area is an area for managing defect information on the optical information recording medium 100 .

The data area 101 is provided at a position of 24.0-58.0 mm from the center of the optical information recording medium 100 . The data area 101 is an area in which data actually desired by the user is written. ISA (Inner Spare Area) and OSA (Outer Spare Area) are provided before and after the data area for recording/reproducing user data as a replacement area for replacing the portion that cannot be recorded/reproduced when there is a portion that cannot be recorded/reproduced due to a defect or the like. (Spare Area).

The outer zone 105 is provided at a position of 58.0 mm to 58.75 mm from the center of the optical information recording medium 100 . The outer zone 105 is provided with a defect management area similar to that of the inner zone 104, and is used as a buffer area so as to allow overrun during seek. A data area (recordable area) in which marks are recorded and reproduced is defined from the inner zone outside the BCA area, that is, the radius of 22.2 mm, to the outer zone on the outer periphery.

In the optical information recording medium 100 of the present embodiment, the information recording layers other than the L0 layer 116 are provided with an area corresponding to the BCA 102, but no unique ID is recorded. In the BCA of the L0 layer 116, a barcode-like signal is recorded in the radial direction by a recording method that generates oxygen bubbles with a high-output laser.

The laser wavelength used for recording on the BCA 102 can be in the infrared to blue-violet region. An infrared laser is preferable in terms of output (or in order to widen the beam width in the radial direction in consideration of productivity), but in order to obtain high quality, it is preferable to use a blue-violet laser that is actually used for mark recording. . Furthermore, in a pulse-modulated laser, a higher quality BCA 102 can be obtained by controlling using high power/low power/OFF modulation instead of two ON/OFF modulations. Further, the BCA 102 may be recorded in any step after the L0 information recording layer 116 is formed, after the intermediate layer 113 is formed, or after the cover layer 120 is formed. Post-formation is preferred. In that case, it is preferable to irradiate the laser from the side of the substrate having no grooves.

In addition, the inner peripheral side of the L0 layer 116 is the inner zone, and the outer peripheral side is the outer zone. In this case, the address order of the L0 layer 116 is recorded from the inner circumference to the outer circumference, and recording and reproduction are performed from the inner circumference to the outer circumference. The address order of the L1 layer 117 is recorded from the outer circumference to the inner circumference, and recording and reproduction are performed from the outer circumference to the inner circumference. The address order of the L2 layer 118 is recorded from the inner circumference to the outer circumference, and recording and reproduction are performed from the inner circumference to the outer circumference. The address order of the L3 layer 119 is recorded from the outer circumference to the inner circumference, and recording and reproduction are performed from the outer circumference to the inner circumference. Such recording/reproducing progress eliminates the need for a full seek from the outer circumference to the inner circumference. The L2 layer 118 can be sequentially recorded and reproduced from the inner circumference side to the outer circumference side, and the L3 layer 119 can be sequentially recorded and reproduced from the outer circumference side to the inner circumference side. can be done.

Next, the stack structure of the optical information recording medium 100 will be described in detail with reference to FIG. The thickness of the substrate 112 is approximately 0.475 mm, and the total thickness of the optical information recording medium 100 is 1.2 mm or less. The thickness of the cover layer 120 is at least 50.5 μm or more. The substrate 112 is made of a polycarbonate material, and the intermediate layers 113 to 115 and the cover layer 120 are made of an acrylic UV curable resin. The elastic moduli of the substrate 112 and the cover layer 120 are on the order of 10 ⁹ Pa and 10 ⁷ Pa, respectively.

Next, the intermediate layers 113-115 will be described in detail. Here, the intermediate layer 113 will be described as an example. 4 is a cross-sectional view of the intermediate layer 113 of the A-side optical information recording medium 110. FIG. As shown in FIG. 4, the intermediate layer 113 is composed of an adhesive layer 401 and a transfer layer 402 onto which the grooves are transferred. formed on the front side. The elastic moduli of the adhesive layer 401 and the transfer layer 402 are on the order of 10 ⁸ Pa and 10 ⁹ Pa, respectively. Substrate 112 is soft compared to transfer layer 402 . In addition, since the polycarbonate material is a thermoplastic resin, when heat is applied during mark recording, the polycarbonate material softens from the room temperature state. As for the resin material used for each intermediate layer, a material having a common hardness may be used, or a different material may be used for each layer. In the present embodiment, cover layer 120 has a thickness of 54 μm, intermediate layer 115 has a thickness of 11.5 μm, intermediate layer 114 has a thickness of 19.5 μm, and intermediate layer 113 has a thickness of 15.5 μm. is. The thicknesses of the intermediate layers 113 to 115 are set as described above, but they may be optimized so as to reduce the interference (interlayer interference) of the diffracted light from each information surface, and the thickness of the intermediate layers is the thickness described above. is not limited to In the case of an optical information recording medium having four information layers, the thickness may be between 10 μm and 24.5 μm.

Next, the film structure of each information surface will be described. FIG. 5 shows the configuration of the L0 layer 116. As shown in FIG. The L0 layer 116 is provided with a first dielectric film 501, a recording film 502 and a second dielectric film 503 in this order from the laser incident side. A material containing at least zinc oxide is used for the first dielectric film 501, and its film thickness is 5 to 20 nm. The recording film 502 has a role of forming/storing marks that serve as signals, is made of a material containing at least tungsten oxide and manganese oxide, and has a film thickness of 25 to 50 nm. The BCA 102 is also recorded on the recording film 502 . A material containing at least zirconium oxide is used for the second dielectric film 503, and its film thickness is 5 to 20 nm. Regarding the L1 layer 117, the L2 layer 118, and the L3 layer 119, the positional relationship between the first dielectric film 501, the recording film 502, and the second dielectric film 503 is the same. A first dielectric film 501 , a recording film 502 and a second dielectric film 503 .

FIG. 6 shows the configuration of the L1 layer 117. As shown in FIG. The L1 layer 117 is provided with a first dielectric film 601, a recording film 602 and a second dielectric film 603 in this order from the laser incident side. A material containing at least zinc oxide is used for the first dielectric film 601, and its film thickness is 5 to 25 nm. The recording film 602 has the role of forming/storing marks that serve as signals, is made of a material containing at least tungsten oxide and manganese oxide, and has a film thickness of 25 to 50 nm. A material containing at least zirconium oxide is used for the second dielectric film 603, and its film thickness is 5 to 25 nm.

FIG. 7 shows the configuration of the L2 layer 118. As shown in FIG. The L2 layer 118 is provided with a first dielectric film 701, a recording film 702 and a second dielectric film 703 in this order from the laser incident side. A material containing at least zinc oxide is used for the first dielectric film 701, and its film thickness is 5 to 30 nm. The recording film 702 has the role of forming/storing marks that serve as signals, is made of a material containing at least tungsten oxide and manganese oxide, and has a film thickness of 25 to 55 nm. A material containing at least zirconium oxide is used for the second dielectric film 703, and the film thickness thereof is 5 to 30 nm.

FIG. 8 shows the configuration of the L3 layer 119. As shown in FIG. The L3 layer 119 is provided with a first dielectric film 801, a recording film 802 and a second dielectric film 803 in this order from the laser incident side. A material containing at least zinc oxide is used for the first dielectric film 510, and its film thickness is 5 to 35 nm. The recording film 511 has the role of forming/storing marks that serve as signals, is made of a material containing at least tungsten oxide and manganese oxide, and has a film thickness of 25 to 55 nm. A material containing at least zirconium oxide is used for the second dielectric film 803, and its film thickness is 5 to 35 nm.

FIG. 9 shows the breakdown of information recorded in the BCA 102. As shown in FIG. The BCA 102 has an 18-byte area (I0 to I17). For example, AB side identification information is recorded in I1, and media type ID information 902 is recorded in I5 to I6. In the present disclosure, the recording order for each of the L0 layer 116 to L3 layer 119 is recorded as the groove recording order information 901 in I7 or I8 of the BCA 102 . As shown in FIG. 12, the recording order information is 0 when recording from the Groove track (indicated by "G→L" in the table), and when recording from the Land track (indicated by "L→G" in the table). is represented by 1-bit information such as 0, and information for four layers is individually recorded, so the total amount of information is 4 bits. The BCA 102 may be recorded on both sides of the A-side optical information recording medium 110 and the B-side optical information recording medium 111, or may be recorded only on the A-side optical information recording medium 110. FIG. Since recording and reproduction are performed on both sides of the optical information recording medium 100 by synchronizing two upper and lower optical pickups provided in the optical recording/reproducing apparatus, in principle, the A-side optical information recording medium 110 and the B-side optical information recording medium are used. The information regarding the recording order recorded in 111 must match. Therefore, the groove recording order information 901 may be added to the BCA 102 only on one side, or the groove recording order information 901 may be added to the BCAs 102 of both the A-side optical information recording medium 110 and the B-side optical information recording medium 111 . may be given. An advantage of giving the groove recording order information 901 to only one BCA 102 is an improvement in productivity. The BCA 102 is recorded in advance when the optical information recording medium 100 is produced. It is possible to reduce the number of man-hours for recording the minute groove recording order information 901 .

The groove recording order information 901 shown here is the recording order in the data zone, and the recording order in the management area is not limited to this. The management area and the data zone have different data cluster sizes, and since the management area has a stronger error correction function, the required reproduction signal quality is lower than that of the data zone. Therefore, it is not necessary to specify the recording order in the management area. However, if it is desired to specify the groove recording order information 901 in the management area for each information layer, the groove recording order information 901 in the management area may be separately given to the BCA 102 in the same manner as the groove recording order information 901 in the data zone. good. Next, an optical recording/reproducing apparatus for recording/reproducing with respect to the optical information recording medium 100 will be described.
[2. Configuration of Optical Recording/Reproducing Device]
FIG. 10 is a configuration diagram of an optical recording/reproducing apparatus 1000 according to this embodiment. As shown in FIG. 10, the optical recording/reproducing apparatus 1000 includes an optical head 1001, a spindle motor 1002, a servo controller 1003, a recording pulse generation circuit 1004, a recording expected waveform generation circuit 1005, a modulation circuit 1006, an error correction coding circuit 1007, A reproduced signal decoding circuit 1008, a demodulating circuit 1009, an error correction decoding circuit 1010, a recording condition evaluation circuit 1011, an I/F circuit 1012, a buffer memory 1013, a system controller 1014, a ROM (Read Only Memory) 1015, a reproduced signal memory circuit 1017 and A noise waveform addition circuit 1018 is provided.

The optical recording/reproducing apparatus 1000 records and reproduces user data on the optical information recording medium 100 .

A spindle motor 1002 rotates the optical information recording medium 100 . The optical head 1001 records user data on the optical information recording medium 100 and reproduces user data from the optical information recording medium 100 by irradiating the optical information recording medium 100 with a light beam.

A servo controller 1003 controls an optical head 1001 and a spindle motor 1002 to converge and scan a light beam emitted from the optical head 1001 onto the optical information recording medium 100 on a track provided on the optical information recording medium 100. control and movement control for accessing the target track. A servo controller 1003 controls the position of the optical head 1001 and the rotation speed of the spindle motor 1002 so that the optical head 1001 scans the optical information recording medium 100 at a predetermined linear velocity.

The I/F circuit 1012 receives user data to be recorded on the optical information recording medium 100 from the host 1016 and stores it in the buffer memory 1013 . Also, the I/F circuit 1012 sends user data stored in the buffer memory 1013 reproduced from the optical information recording medium 100 to the host 1016 . It also transmits user data stored in the buffer memory 1013 to other internal blocks, and stores user data received from other internal blocks in the buffer memory 1013 .

The error correction encoding circuit 1007 adds a parity code for error correction to the user data received from the I/F circuit 1012 to generate encoded data.

Modulation circuit 1006 receives encoded data from error correction encoding circuit 1007 and generates a modulated signal modulated according to a predetermined modulation code.

A recording expected waveform generating circuit 1005 generates a waveform of a reproduction signal (recording expected waveform) expected to be obtained when a track on which user data is recorded is reproduced from the modulated signal during recording.

A recording pulse generation circuit 1004 converts the expected recording waveform generated by the expected recording waveform generation circuit 1005 into a recording pulse signal, and drives the light beam of the optical head 1001 . A mark is formed on the optical information recording medium 100 by the heat of the irradiated light beam. On the other hand, user data recorded on the optical information recording medium 100 is reproduced by a reproduction signal decoding circuit 1008, a demodulation circuit 1009, and an error correction decoding circuit 1010. FIG.

The optical head 1001 constitutes an optical pickup having a laser that emits a light beam with a wavelength λ and an objective lens with a numerical aperture N. The optical head 1001 irradiates the optical information recording medium 100 with a light beam and detects reflected light from the optical information recording medium 100 . The optical head 1001 outputs a reproduced signal based on the detected reflected light.

A reproduced signal decoding circuit 1008 decodes the reproduced signal to generate a decoded signal. Specifically, PRML signal processing (an example of maximum likelihood decoding) is performed to select the closest expected value waveform by comparing the reproduced signal and the expected value waveform, and output the pattern signal that is the basis of the expected value waveform as a decoded signal. conduct. The characteristic of the expected value waveform takes into consideration the influence of the band limitation due to the frequency characteristic of detection with the light beam.

Demodulation circuit 1009 demodulates the encoded data from the decoded signal according to a predetermined modulation code.

Error correction decoding circuit 1010 corrects errors in the demodulated coded data and restores user data.

The ROM 1015 is composed of flash memory. The ROM 1015 stores programs for the system controller 1014 to control the entire optical recording/reproducing apparatus 1000 .

The system controller 1014 reads and executes programs stored in the ROM 1015 to control each circuit and communication with the host 1016 . In FIG. 10, arrows indicating control of each component from the system controller 1014 are omitted for the sake of convenience. The system controller 1014 of the optical recording/reproducing apparatus 1000 in this embodiment controls the operation of each circuit related to recording and reproducing user data.

The reproduced signal memory circuit 1017 samples the reproduced signal obtained from the optical head 1001 and stores the sampled digital waveform data in the buffer memory 1013 through the I/F circuit 1012 . When an unrecorded track on which no user data is recorded is reproduced, a disc noise reproduction signal containing disc noise components generated by variations in track shape and reflectance of the optical information recording medium 100 is obtained. The capacity of the reproduced signal memory circuit 1017 is 2 GB, and if 1.5 GB of it is used for waveform storage, waveforms for about 210 clusters can be stored.

The noise waveform addition circuit 1018 reads the digital waveform data of the disc noise reproduction signal stored in the buffer memory 1013 through the I/F circuit 1012 and outputs the digital waveform data to the recording expected waveform generation circuit 1005 . Since the disc noise reproduction signal contains laser noise and circuit noise during reproduction, it is output to the recording expected waveform generation circuit 1005 after being subjected to low-pass filter processing to reduce the effects of these.

The recording order information given to the BCA 102 does not limit the reproduction order. Since what is required when reproducing data by the 3Trk-XTC method is the waveform of the target track and the waveform of the adjacent track, the order of waveform acquisition and the recording order of the tracks are irrelevant. For example, in tracks recorded in the order of Land track→Groove track, the waveform may be acquired from the Groove track even when the Land track is reproduced.
[3. Operation of Optical Recording/Reproducing Device]
First, the recording operation to the track of the data zone of the optical information recording medium 100 by the optical recording/reproducing apparatus 1000 in this embodiment will be described.

FIG. 11 shows a flowchart from BCA reproduction to recording. After starting the disc, the BCA is accessed and the groove recording order information 901 of each layer is read. When the groove recording order information 901 is 0, recording is performed in order from the adjacent Groove track to the Land track, and when the groove recording order information 901 is 1, recording is performed in order from the adjacent Land track to the Groove track.

The adjacent tracks are tracks having a common physical address. The groove of the stamper has a meandering portion, and address information is recorded in the meandering portion. Since the physical address is recorded in one polarity of the stamper, a common address is assigned to adjacent tracks. Addresses are given in the same direction as the direction of the spiral. Which groove, the Groove track or the Land track, is the center of the meandering depends on the polarity of the stamper making process. A physical address is given from the Land track.

When the target layer is unrecorded (blank), recording is performed from the first address, and when the target layer is recorded halfway, recording is performed from the following address. FIG. 12 shows an example of groove recording order information 901 . Thus, the groove recording order information 901 of each layer can be read from the BCA signal. In the example of FIG. 12, the L0 layer 116 and L3 layer 119 are recorded from the Groove track first, and the L1 layer 117 and L2 layer 118 are recorded from the Land track first. It is known that the signal quality of a 4-layer, narrow-pitch, multi-level recording, 3Trk-XTC disc differs depending on whether the groove polarity of the groove or land track is used for recording. In the L1 layer 117 and the L2 layer 118, which are sandwiched between hard and hard to swell intermediate resin layers, there is a tendency that better characteristics are obtained when the land is recorded first. By specifying the recording order for each layer with BCA, it is possible to achieve better playback signal quality for each layer of the disc.

The I/F circuit 1012 acquires the user data transmitted from the host 1016 and the logical address (LSN: Logical Sector Number) of the recording destination. The user data is divided into predetermined units of data blocks and sent to the error correction coding circuit 1007 for each data block.

The error correction coding circuit 1007 adds a parity code for correcting errors during reproduction to user data in units of data blocks to generate coded data.

A modulation circuit 1006 modulates the encoded data with the parity code added thereto into a modulated signal according to a predetermined modulation code.

A recording expected waveform generation circuit 1005 and a recording pulse generation circuit 1004 form marks on the optical information recording medium 100 so that a reproduced signal close to a recording expected waveform can be obtained upon reproduction. Conventionally, binary modulation signals generated by RLL modulation codes are recorded as they are as marks or spaces.

The recording expected waveform generation circuit 1005 and the recording pulse generation circuit 1004 of this embodiment are not a binary level recording method in which a section in which the value of the modulated signal sequence is 1 is a mark and a section in which the value is 0 is a space. This is based on a recording method for forming multi-level marks on the optical information recording medium 100 so that a reproduced signal close to the waveform expected to be recorded can be obtained.

FIG. 13 shows a recording expected waveform generated by the recording expected waveform generation circuit 1005. As shown in FIG. An expected waveform 1302 of a reproduced signal without distortion is generated from a modulated signal sequence 1301 to be recorded. An expected waveform 1302 of a reproduced signal without distortion can be calculated by convoluting the impulse response waveform obtained from the frequency characteristics of detection with the light beam and the modulated signal sequence 1301 to be recorded. The expected recording waveform 1303 is calculated as a waveform sampled at intervals of 1T, and the maximum value of the frequency band is as low as 0.15. According to the sampling theorem, if the frequency is 0.3 or more, which is twice 0.15, that is, if sampling is performed at intervals smaller than 3.33T, it can be represented without deterioration. In the case of this embodiment, the 2T interval is used, which is easier to implement than the 3.33T interval. The recording expected waveform 1303 is generated by sampling (resampling) the expected waveform 1302 of the reproduction signal without distortion at intervals of 2T. A recording expected waveform 1303 corresponds to an example of a second expected waveform. In order to obtain a waveform close to the expected waveform 1302 of the reproduced signal without distortion when reproduced, it is necessary to form recording marks having a size corresponding to the signal amplitude value of the expected recording waveform 1303 at intervals of 2T. good. The sampling interval of the recording expected waveform 1303 may be appropriately set according to the maximum value of the frequency characteristics of the reproduced signal to be reproduced.

FIG. 14 shows how a recording mark having a size corresponding to the signal amplitude value of the recording expected waveform 1303 is formed. A laser emission waveform by the recording pulse signal 1404 based on the signal amplitude value of the recording expected waveform 1303 is used instead of the laser emission waveform corresponding to the value of the modulation signal series. When the signal amplitude value of the recording expected waveform 1303 is large, the power is increased and the light emission width is widened, and when the signal amplitude value is small, the power is decreased and the light emission width is narrowed. As a result, as shown in FIG. 14, recording marks 1406 having different sizes are continuously formed on the track 1405 at intervals of 2T for each sampling point of the recording expected waveform 1303 . The recording mark 1406 formed in this manner has a mark shape that provides an expected reproduction waveform corresponding to the modulated signal sequence when reproduced by irradiating it with a light beam. In the formation of recording marks, the power height and emission width of the recording pulse signal may be controlled in combination with the conditions immediately before, since the effect of heat due to the immediately preceding laser emission is also propagated. FIG. 15 shows a reproduced signal when the recording state shown in FIG. 14 is reproduced. A sampled waveform 1503 of a reproduction signal that is close to the expected waveform 1302 of the reproduction signal without distortion generated during recording is obtained from the continuously formed recording marks. A good sampled waveform 1503 of the reproduced signal is obtained by multi-level recording instead of binary level recording of marks and spaces. can be obtained.

The optical head 1001 drives laser output based on the recording pulse signal 1404 . By irradiating a track on the optical information recording medium 100 with a laser pulse, marks corresponding to the recording pulse signal are continuously formed.

A system controller 1014 controls the above recording operation. The system controller 1014 determines the recording position on the optical information recording medium 100 and controls the servo controller 1003 to move the optical head 1001 to the target position. The error correction coding circuit 1007 is operated before reaching the target track. After reaching the target position, the modulation circuit 1006, the recording expected waveform generation circuit 1005, and the recording pulse generation circuit 1004 are operated to perform recording.

Recording is performed according to the groove recording order information 901 designated by the BCA. If the designated recording order is from the adjacent Land track to the Groove track, the Land track is sought first and recording is started.

As a recording method, as shown in FIG. 16, there is a method of recording all the groove polarities on one side of the layer (entire surface) and then recording on the other groove. FIG. 16 shows a case in which the land track is recorded first. In the L0 layer 116 and L2 layer 118 where the physical address direction 1604 is from the inner circumference to the outer circumference of the disc, the left side of the figure is the inner circumference side and the right side of the figure. is the outer peripheral side. Conversely, in the L1 layer 117 and L3 layer 119 where the physical address direction 1604 is from the outer circumference to the inner circumference of the disk, the left side of the drawing is the outer circumference side and the right side of the drawing is the inner circumference side. The land tracks are arranged on the inner peripheral side of the adjacent Groove tracks in the L0 layer 116 and the L2 layer 118 and on the outer peripheral side of the adjacent Groove tracks in the L1 layer 117 and the L3 layer 118 .

The circled numbers in the figure simply indicate the recording order of the Groove track 1602 and the Land track 1601 . When the land track 1601 is recorded first, L(1)→L(2)→L . Assume that recording is done in the direction of the arrow 1603 within the track. In this method, since the groove polarity on one side is recorded at once, there is an advantage that parameter change or the like is not required during recording. Since a state in which little signal leakage (crosstalk) from the adjacent track is maintained until the adjacent track is recorded, high reproduced signal quality can be expected. In addition, since the Groove track 1602 and the Land track 1601 are rarely switched during recording, less perturbation conditions need to be adjusted when switching the groove polarity.
Alternatively, as shown in FIGS. 17 and 18, a method of recording adjacent groove polarities for each relatively small block of about several tracks may be used. FIG. 17 shows the case where the Land track 1601 is recorded first, and FIG. 18 shows the case where the Groove track 1602 is recorded first. The relationship between the inner circumference and the outer circumference of the disc and the recording direction within the track are the same as in FIG. The circled numbers in the figure indicate the order of recording, and the recording is performed in the order of (1)→(2)→(3)→ . . . In this example, four tracks each of Groove track 1602 and Land track 1601 are treated as one block. Although there is no specification for the unit of small blocks, it is desirable that each of the Groove track 1602 and the Land track 1601 has three or more tracks in order to perform 3Trk-XTC during reproduction. When using this method, contiguous information is recorded on adjacent tracks. For example, L(2), L(3), L(4), L(5), L(6), L(7), and L(8) in FIG. ) and L(9), G(1), G(2), G(3), G(4), G(5), G(6). ), G(7), G(8) and G(9).

On the other hand, when recording in relatively small blocks as shown in FIGS. 17 and 18, continuous information is recorded on a total of 8 tracks in 1 block of (9) to (16) in the figures, and those tracks are reproduced. 17, and (4) and (21) in FIG. 18, a total of only two tracks. As described above, in the recording for each track in FIG. 16, waveforms of nine tracks in which irrelevant information is recorded must be acquired, whereas in the case of FIGS. 17 and 18, the irrelevant information Only two waveforms are required for the track on which is recorded, and an improvement in the transfer rate can be expected. In addition, by recording in relatively small blocks, the number of accesses to each track during playback can be reduced, and deterioration of the film due to an increase in the number of times the playback light is irradiated can be suppressed, improving playback durability. I can expect it. When recording is performed for each block, dummy recording or the like can be used to set all or part of the tracks in the block to a recorded state. It is possible to prevent the tracking servo from becoming unstable due to the recording order of the track 1602 and the land track 1601 being reversed and the boundary between the recorded portion and the unrecorded portion being frequently generated. Also, in the present embodiment, the recording order has been described in units of tracks, but the actual recording unit is in units of clusters. The Groove track 1602 and the Land track 1601 are recorded in the same cluster unit, and FIGS. 16, 17 and 18 schematically show some tracks continuously recorded in a spiral shape.

Also, in the optical recording/reproducing apparatus 1000, zones are designated at intervals of about 1 mm in which the number of revolutions of the disc is kept constant. This is to make the linear velocity during recording and reproduction constant from the inner circumference to the outer circumference of the disk. A method of recording the groove polarity on the other side may also be used. This method provides advantages of both the track-by-track recording method shown in FIG. 16 and the relatively small block-by-block recording method shown in FIGS.

Also, each cluster number unit that can be stored in the reproduced signal memory 1017 may be recorded as one block. Since waveforms for about 210 clusters can be stored in the reproduced signal memory 1017, 105 clusters each of the Groove track and the Land track may be recorded as one block. By performing this method, the memory can be used efficiently without waste.

FIG. 20 is a diagram showing an example of the relationship between track arrangement and recording order, track arrangement identifiers, and track arrangement information in the case of the L0 layer 116 and L2 layer 118 . FIG. 21 is a diagram showing an example of the relationship between track arrangement and recording order, track arrangement identifiers, and track arrangement information in the case of the L1 layer 117 and L3 layer 119 . Description will be made below with reference to FIG. PSN (Physical Sector Number) is a physical sector number used when the optical recording/reproducing apparatus 1000 performs recording/reproducing. The PSN of the 500 GB archival disc provides bit information (GrooveLand identifier) for identifying Groove tracks and land tracks. bit information (track allocation identifier) for However, this makes it impossible to determine whether the track accessed from the PSN is a Groove track or a Land track. Also, as shown in FIG. 20, there are two patterns of arrangement of Groove tracks and Land tracks, and it is necessary to identify which pattern. Therefore, an area for recording disc usage information (DUI: Disc Usage Information) as shown in FIG. 22 is further provided in the recordable area 103 of FIG. Then, the DUI is recorded in that area when the disc is initialized. The DUI stores track assignment information (Track Assign) 2201 for each layer. In the track arrangement information 2201, information of tracks arranged on the inner circumference side is stored in a bit format as indicated by 2008 in FIG. 16 becomes 2002 in FIG. 20, and it can be identified from the track arrangement information 2008 of the DUI that the Land track is arranged on the inner circumference side of the Groove track. When the track arrangement identifier is 0, the PSN indicates a land track, and when it is 1, the PSN indicates a groove track.
Here, when the track to be recorded first is different for each layer because the groove recording order information 2006 read from the BCA is different for each layer, the track to be recorded first is the inner circumference side for the L0 layer 116 and the L2 layer 118. , the L1 layer 117 and the L3 layer 119 are arranged on the outer peripheral side. This will be arranged as 2001 and 2002 in FIG. Also, by using the track arrangement identifier instead of the GrooveLand identifier for the PSN, the relationship between the track arrangement and the PSN becomes the same for both 2001 and 2002 as the 500 GB archival disc, so the same recording method is used for recording. can reduce the time required for firmware development. Also, since the track arrangement identifier 2007 is smaller for the track recorded first, it is also possible to record in order of PSN. If the LSNs indicated by the user are assigned in order of PSNs, they can be recorded in order of LSNs. That is, it is possible to record the user data in a recording order that can realize high signal quality. It should be noted that the tracks to be recorded first may be arranged on the outer peripheral side as indicated by 2003 and 2004 in FIG. Even if the track to be recorded first is different for each layer, the positional relationship between the PSN and the track is the same, so there is only one recording method. Therefore, the same effect can be obtained as when the track to be recorded first is arranged on the inner circumference side. Although the recording method has been described with reference to FIG. 16, the same effects can be obtained with the recording methods of FIGS. 17 and 18 as well. It should be noted that the manufacturer of the optical recording/reproducing apparatus 1000 determines whether the tracks to be recorded first are arranged on the inner circumference side, such as 2001 and 2002, or on the outer circumference side, such as 2003 and 2004, depending on the recording method. The optimum arrangement is determined and recorded as DUI track arrangement information. Note that the track arrangement information 2201 is not limited to this as long as the arrangement of Groove tracks and Land tracks can be determined. For example, 0 may be indicated when the Groove track is on the outer peripheral side, and 1 when the Land track is on the outer peripheral side. Also, it does not have to be in bit form. Note that the PSN may be assigned a GrooveLand identifier. By assigning the track arrangement identifier to higher bits than the GrooveLand identifier, the PSN of the inner track becomes smaller than the PSN of the outer track, and the relationship between the PSN and the track arrangement becomes the same as when the GrooveLand identifier is not assigned. Therefore, they can be recorded by the same recording method. In the present disclosure, the L0 layer 116 and the L2 layer 118 are described using FIG. 2003 and 21044 correspond to 2004. Since the L1 layer 117 and the L3 layer 119 are recorded from the outer circumference toward the inner circumference, the inner circumference side and the outer circumference side are reversed in 2007, 2008, and 2009, but the recording method is the same.
This disclosure assumes that the DUI is recorded when the disc is initialized. This is because if the disk arrangement information 2201 is not changed after disk initialization, the DUI can be recorded at the time of initialization, and the DUI can be efficiently recorded. The same DUI may be recorded in multiple clusters in order to ensure redundancy and playback durability. In addition, it may be recorded in a plurality of areas separated from each other. By recording in a plurality of areas separated from each other, it is possible to prevent impossibility of recording/reproducing due to defects such as dust.
Although an area for recording the DUI is further provided in the recordable area 103 of the inner zone, it may be recorded in the DMA. As a result, there is no need to provide a new dedicated area, and redundancy can be ensured by adding the same DUI according to the update of the defect information. Further, when it is desired to change the track arrangement information after the disc is initialized, the track arrangement information can be changed by additionally writing together with the latest information of the DMA.
In the present disclosure, the recording order given to the BCA is the recording order in the data zone, and the recording order in the management area is not given. Since the management area has a stronger error correction function than the data zone, it is possible to ensure the quality of the reproduced signal without recording in the recording order assigned to the BCA. For example, as indicated by 2004 in FIG. 20, even when the data zone is recorded from the outer track, the management area can be recorded from the inner groove track. As a result, the management area can be recorded from the same inner track as the 500 GB archival disc, and the time required for firmware development can be shortened. Here, the management area is sequentially recorded from one additional write position. First, the track to be recorded first is recorded, and when that track is used up, the other track is recorded. Therefore, when recording/reproducing the management area, information on the recording order of the management area is required. However, since the recording order of the management area is not assigned to the BCA, as shown in FIG. In 103, the DUI is recorded when the disk is initialized. In the pre-write track information 2202 of the management area, information of the pre-write track of each layer is stored in bit form. For example, in 2001 of FIG. 20, the pre-write track information indicates 0 when the management information is recorded from the groove track on the inner circumference side. When the management information is recorded from the land track on the outer peripheral side, the pre-write track information indicates 1. This makes it possible to determine the recording order of the tracks in the management area. Also, by recording in the DUI, the manufacturer of the optical recording/reproducing device 1000 can determine the optimum recording order for the optical recording/reproducing device 1000 instead of the manufacturer of the optical information recording medium 100 . In the present disclosure, as the pre-write track information, the L0 layer and the L2 layer are pre-written on the inner circumference side, and the L1 layer and the L3 layer are pre-written on the outer circumference side. is not limited to this. For example, if the pre-write track is a Groove track, it may be 0, and if it is a Land track, it may be 1. Also, it does not have to be in bit form.

Next, the reproducing operation of the optical recording/reproducing apparatus 1000 in this embodiment will be described.

A reproduced signal decoding circuit 1008 decodes the reproduced signal output from the optical head 1001 by PRML signal processing to generate a decoded signal, as shown in the figure. Demodulation circuit 1009 demodulates the decoded signal according to the d=1 restricted RLL modulation code, and error correction decoding circuit 1010 corrects errors in the demodulated coded data to restore user data.

A system controller 1014 controls the playback operation described above. The system controller 1014 controls the servo controller 1003 to move the optical head 1001 to the target position. When the target position is reached, the reproduction signal decoding circuit 1008 and the demodulation circuit 1009 are operated, and then the error correction decoding circuit 1010 is operated to restore the user data. The restored user data is stored in the buffer memory 1013, and the reproduction operation is completed by sending the user data to the host 1016 through the I/F circuit 1012. FIG.

Also, the recording condition evaluation circuit 1011 compares the sampled waveform 1503 of the reproduced signal shown in FIG. 15 obtained during reproduction with the expected waveform 1302 of the reproduced signal without distortion shown in FIG. Measure the deviation. Based on this measurement result, the system controller 714 adjusts the conditions of the power height and emission width of the recording pulse signal 1404 with respect to the signal amplitude value of the recording expected waveform 1303 shown in FIG. That is, the recording condition evaluation circuit 1011 corrects the relationship between the power and the time width according to the amplitude value of the recording expected waveform. This makes it possible to correct deviations in the recording state due to changes in the light emission power of the optical head 1001 or the like.

In addition, by separating the reflected light into each light amount signal by the splitting element, each light amount signal can have different characteristics of adjacent track components. It becomes possible to effectively control the crosstalk component and obtain a highly accurate reproduced signal even with a narrow track pitch. (See Patent Document 2 for details)
The recording order information assigned to the BCA does not limit the reproduction order. Since what is required when reproducing data by the 3Trk-XTC method is the waveform of the target track and the waveform of the adjacent track, the order of waveform acquisition and the recording order of the tracks are irrelevant. For example, in tracks recorded in the order of Land track→Groove track, the waveform may be acquired from the Groove track even when the Land track is reproduced.

If the groove recording order information 901 recorded on the optical information recording medium 100 cannot be written or read for some reason, the optical recording/reproducing apparatus 1000 can store the recording order in the buffer memory 1013 or ROM 1015. Therefore, it is also possible to set the optimum recording method of data on the optical information recording medium 100 . FIG. 19 shows the flow from reading the groove recording order information 901 to recording in that case. Play the BCA to read the media type ID information. When information about the recording order is given to the BCA of the disc, the groove recording order information 901 stored in the firmware of the optical recording/reproducing device 1000 and the information of the groove recording order information 901 read from the BCA are collated and matched. If so, recording is performed in the specified order. If they do not match, priority is given to the groove recording order information 901 recorded in the BCA. By associating the recording order information with the media type ID, there is the advantage of reducing the man-hours required for BCA recording during media production, but the media type ID must be changed each time the optimum recording order is changed. It also has the disadvantage of disappearing.
If both the BCA 102 and the optical recording/reproducing apparatus 1000 do not have the groove recording order information 901, recording is performed in order from the Groove track to the Land track.

In addition, in the present disclosure, the order of recording in the groove tracks and the land tracks and the method of assigning them have been described, taking as an example the case of performing multilevel recording on an archival disc having a structure in which both sides are laminated with four layers on one side. , but not limited to this example only.

When 3Trk-XTC is performed, the waveforms of adjacent Land tracks on both sides are required even when reproducing a Groove track. When recording both Groove tracks and Land tracks on the optical information recording medium 100 with a narrow track pitch, the marks recorded in the previously written track with the groove polarity are replaced by the later recorded marks with the other groove polarity. Since there is a possibility that a part of the track will be overwritten, the reproduced signal quality of the track recorded later will be higher if 3Trk-XTC is not performed. However, when waveforms of both groove tracks and land tracks are used in the 3Trk-XTC method, the waveforms of both groove polarities are used, so the relationship between the recording order and the quality of the reproduced signal becomes complicated. A phenomenon occurs in which the optimum recording order differs for each layer due to the hardness of the resin layer.

That is, the content of giving information on the optimum recording order for each information layer is effective regardless of the number of information recording layers of the disc or the number of multilevel signals. Even when binary recording of 0 and 1 is performed on a disk having .

The optical information recording medium of the present disclosure and the method for recording/reproducing the same are configured to have an information layer exhibiting higher reproduced signal quality, so they are suitable for recording information at high recording densities, and are suitable for recording large-capacity content. It is useful for an optical information recording medium for recording Specifically, it is useful for next-generation optical information recording media (for example, recording capacity of 1 TB) having four information layers on both sides according to archival disc standards.

100 Optical Information Recording Medium 101 Data Zone 102 BCA Area 103 Recordable Area in Inner Zone 104 Inner Zone 105 Outer Zone 110 A Side Optical Information Recording Medium 111 B Side Optical Information Recording Medium 112 Substrate 113, 114, 115 Intermediate Layer 116 L0 Layer 117 L1 layer 118 L2 layer 119 L3 layer 401 Adhesive layer 402 Transfer layer 501, 601, 701, 801 First dielectric film 502, 602, 702, 802 Recording film 503, 603, 703, 803 Second dielectric film 901 Groove Recording Order Information 902 Media Type ID Information 1000 Optical Recording/Reproducing Device 1001 Optical Head 1002 Spindle Motor 1003 Servo Controller 1004 Recording Pulse Generation Circuit 1005 Recording Expected Waveform Generation Circuit 1006 Modulation Circuit 1007 Error Correction Encoding Circuit 1008 Reproduction Signal Decoding Circuit 1009 Demodulation Circuit Circuit 1010 Error correction decoding circuit 1011 Recording condition evaluation circuit 1012 I/F circuit 1013 Buffer memory 1014 System controller 1015 ROM
1016 Host 1017 Reproduced Signal Memory Circuit 1018 Noise Waveform Addition Circuit 1301 Modulated Signal Sequence to be Recorded 1302 Expected Waveform 1303 Recorded Expected Waveform 1404 Recording Pulse Signal 1405 Track 1406 Recording Mark 1503 Sampling Waveform of Reproduced Signal 1504 Decoded Modulated Signal Sequence 1601 Land Track 1602 Groove track 1603 Intra-track recording direction 1604 Physical address direction 2001 Groove destination, record from the inner side 2002 Land destination, record from the inner side 2003 Groove destination, record from the outer side 2004 Land, record from the outer side 2006 Groove recording Order information 2007 PSN track allocation identifier 2008 DUI Track Assign bit
2009 Track layout 2101 Record from the outer circumference of the groove 2102 Record from the outer circumference of the land 2103 Record from the inner circumference of the groove 2104 Record from the inner circumference of the land 2201 Track Assign
2202 Inner Zone First Write Track

Claims (4)

An optical information recording medium having a plurality of information layers in which two or more layers are laminated, wherein data is recorded in the information layers by irradiation with laser light and data is reproduced from the information layers,
Having a BCA for recording unique information about the optical information recording medium,
at least one of the information layers has an uneven guide groove,
The guide groove has a groove track on the convex side and a land track on the concave side when viewed from the incident side of the laser beam. An optical information recording medium, wherein groove recording order information indicating whether data is to be recorded from the land track or from the land track is recorded in advance. 2. The optical information recording medium according to claim 1, wherein the groove recording order information is set for each information layer. 3. The optical information recording medium according to claim 1, wherein the groove recording order information is provided with at least one bit. 2. The optical information recording medium according to claim 1, comprising two or more information layers sandwiched between substrates on both sides, and having said BCA on at least one side of said information layer.

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