WO2005122151A1 - 情報記録装置及び方法、並びにコンピュータプログラム - Google Patents
情報記録装置及び方法、並びにコンピュータプログラム Download PDFInfo
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- WO2005122151A1 WO2005122151A1 PCT/JP2005/010490 JP2005010490W WO2005122151A1 WO 2005122151 A1 WO2005122151 A1 WO 2005122151A1 JP 2005010490 W JP2005010490 W JP 2005010490W WO 2005122151 A1 WO2005122151 A1 WO 2005122151A1
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- Prior art keywords
- recording
- information
- layer
- recorded
- recording layer
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/0045—Recording
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
- G11B2007/0009—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage
- G11B2007/0013—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage for carriers having multiple discrete layers
Definitions
- the present invention relates to a technical field of an information recording device and method, such as a DVD recorder, and a computer program for causing a computer to function as such an information recording device.
- an information recording medium such as an optical disc such as a CD-ROM (Compact Disc-Read Only Memory), a CD-R (Compact Disc Recordable), and a DVD-ROM
- a plurality of recording layers are laminated on the same substrate.
- a multi-layered, double-layered or multi-layered optical disk has been developed. More specifically, the two-layer type optical disc is located at the foremost side (that is, the side closest to the optical pickup) as viewed from the side irradiated with the laser beam when recording is performed by the information recording device as the first layer.
- L0 layer As appropriate in the present application, it has a first recording layer (referred to as “L0 layer” as appropriate in the present application), and further has a semi-transmissive reflective film located on its inner side (ie, farther from the optical pickup power).
- a second layer a second recording layer (referred to as “L1 layer” in the present application) located on the back side of the semi-transmissive reflection film via an intermediate layer such as an adhesive layer is further provided.
- L1 layer located on the back side of the semi-transmissive reflection film via an intermediate layer such as an adhesive layer.
- a reflective film located at When creating such a multi-layered information recording medium, the L0 layer and the L1 layer are formed separately, and the respective recording layers are bonded together at the end, so that a two-layer type optical disc can be produced at low cost. Can be manufactured.
- Patent Document 1 JP-A-2002-170339
- the two-layer type optical disc In such a two-layer type optical disc, information is recorded by a recording laser pulse suitable for each recording layer. This recording laser power is mainly obtained by OPC (Optimum Power Calibration).
- OPC Optimum Power Calibration
- the two-layer type optical disc has a technical problem that the recording characteristics of the second recording layer are different depending on the recording state of the first recording layer. Specifically, information is recorded on the first recording layer or is not recorded. There is a technical problem that the recording characteristics of the second recording layer differ depending on whether or not there is a recording layer. In particular, since eccentricity may occur in a bonded optical disk, it is difficult or impossible to determine the state of the other recording layer based on the recording tracks or physical addresses of one recording layer. There is a technical problem.
- the present invention has been made in view of, for example, the above-described conventional problems.
- an information recording apparatus and method capable of appropriately recording information on a multilayer information recording medium, and It is an object to provide a computer program that causes a computer to function as such an information recording device.
- an information recording apparatus of the present invention includes an information recording medium including a first recording layer and a second recording layer that record recording information by irradiating an adjustable laser beam.
- various types of recording information can be recorded on each of the first recording layer and the second recording layer by the operation of the recording means.
- various types of recording information can be recorded by irradiating appropriately adjusted laser light.
- the operation of the calculating means calculates position information indicating the position of the recording area of the second recording layer corresponding to the recording area of the first recording layer in which the recording information has already been recorded. That can be S.
- This position information indicates the position of the recording area of the second recording layer corresponding to the recording area of the first recording layer on which the recording information has already been recorded, but indirectly the recording information is still recorded. This indicates the position of the recording area of the second recording layer corresponding to the recording area of the first recording layer.
- the operation of the control means controls the recording means so as to adjust the laser beam based on the position information.
- the information is recorded on the recording area of the first recording layer on which the recording information is already recorded.
- the laser light (or the irradiation condition of the laser light) is adjusted depending on whether or not to do so. It is preferable that this laser beam is adjusted to an appropriate state for recording the record information.
- the information recording apparatus of the present invention it is possible to appropriately record recording information on a multi-layer (particularly, two-layer) information recording medium.
- the calculating means further includes a detecting means for detecting the eccentricity.
- the calculation means further includes a storage means for storing a position of a recording area of the first recording layer on which the recording information has been recorded.
- Information can be detected. In particular, it is not necessary to check the state of the first recording layer again when detecting the position information, and the efficiency of the recording operation can be improved.
- the control unit performs the control based on the position information.
- the laser light is adjusted by switching between the laser light for recording the information on the second recording layer corresponding to the unrecorded first recording layer and the laser light according to the second setting, which is the laser light.
- the recording means is controlled as described above.
- the control unit controls the first and second laser lights after the switching. Switching between the laser light according to the first setting and the laser light according to the second setting with reference to the time at which one of the laser light and the second laser light is applied to the information recording medium.
- the recording means is controlled so as to be switched earlier in advance by the time required for the recording.
- the adjustment of the laser beam in particular, the switching of the laser beam
- the recording characteristics can be further improved.
- control means controls the recording means to adjust at least one of an output power of the laser light and a strategy for controlling a waveform of the laser light. Control.
- the recording is performed on an information recording medium including a first recording layer and a second recording layer that record recording information by irradiating an adjustable laser beam.
- An information recording method in an information recording device including recording means for recording information, wherein the first recording layer on which the recording information is recorded is based on an eccentricity between the first recording layer and the second recording layer. Calculating a position information indicating a position of the recording area of the second recording layer corresponding to the recording area; and, when recording the recording information on the second recording layer, the laser based on the position information. Before adjusting the light And a control step of controlling the recording means.
- the information recording method of the present invention can also adopt various aspects.
- a computer program of the present invention is an information recording control computer program for controlling a computer provided in the information recording apparatus of the present invention (including its various aspects). And causing the computer to function as at least a part of the recording unit, the calculation unit, and the control unit.
- the computer program of the present invention if the computer program is read from a recording medium such as a ROM, a CD-ROM, a DVD-ROM, or a hard disk storing the computer program and executed by the computer, Alternatively, if the computer program is executed after being downloaded to a computer via communication means, the above-described information recording apparatus of the present invention can be realized relatively easily.
- a computer program product in a computer-readable medium is capable of executing a program instruction executable by a computer provided in an information recording device (including various aspects thereof) of the present invention. And the computer functions as at least a part of the recording unit, the calculating unit, and the control unit.
- the computer program product of the present invention if the computer program product is read into a computer from a recording medium such as a ROM, a CD-ROM, a DVD-ROM, or a hard disk that stores the computer program product, or
- a recording medium such as a ROM, a CD-ROM, a DVD-ROM, or a hard disk that stores the computer program product
- the computer program product which is a transmission wave
- the computer program product which is a transmission wave
- the information recording apparatus or method of the present invention includes a recording unit, a calculating unit and a controlling unit, or a calculating step and a controlling step. Therefore, it is possible to appropriately adjust the laser light according to the state of the first recording layer. As a result, it is possible to improve recording characteristics when information is recorded on the second recording layer, and to appropriately record information on a multilayer information recording medium.
- FIG. 1 is a schematic plan view showing a basic structure of an optical disc having a plurality of recording areas according to an information recording medium to be subjected to a recording operation in an embodiment of the information recording apparatus of the present invention.
- FIG. 2 is a schematic sectional view of the disk and a schematic conceptual diagram of a recording area structure in a radial direction associated with the disk.
- FIG. 2 is a block diagram showing a basic configuration of an embodiment according to the information recording apparatus of the present invention.
- FIG. 3 is a flow chart conceptually showing a flow of an entire recording operation of the information recording apparatus according to the embodiment.
- FIG. 4 is a plan view conceptually showing an optical disc having eccentricity.
- FIG. 5 is a plan view conceptually showing operations on the optical disc when the information recording device according to the embodiment calculates address information.
- FIG. 6 is a graph conceptually showing the relationship between the recording laser power and the physical address of the L1 layer when the recording laser power of the information recording apparatus according to the present embodiment is switched.
- FIG. 1A is a schematic plan view showing a basic structure of an optical disc having a plurality of recording areas according to an information recording medium to be subjected to a recording operation of an embodiment of the information recording apparatus of the present invention
- FIG. 1 (b) is a schematic cross-sectional view of the optical disc and a schematic conceptual view of a recording area structure in the radial direction associated with the optical disc.
- an optical disc 100 is formed on a recording surface on a disc body having a diameter of about 12 cm like a DVD, with a center hole 1 as a center.
- a lead-in area 101, a data area 102, and a lead-out area 103 or a middle area 104 according to the example are provided.
- a recording layer or the like is laminated on the transparent substrate 200 of the optical disc 100, for example.
- tracks 10 such as a groove track and a land track are alternately provided in a spiral or concentric manner around the center hole 1.
- ECC block 11 is a data management unit based on a preformat address in which recording information can be corrected for errors.
- the present invention is not particularly limited to an optical disk having such three areas.
- the lead-in area 101, the lead-out area 103, or the middle area 104 may have a further subdivided configuration.
- the optical disc 100 according to the present embodiment constitutes an example of first and second recording layers according to the present invention described later on a transparent substrate, for example. It has a structure in which the L0 layer and the L1 layer are stacked.
- the focus position of the laser beam LB irradiated from the upper side to the lower side is shown.
- recording / reproduction in the L0 layer or recording / reproduction in the L1 layer is performed.
- the optical disc 100 according to the present embodiment is not limited to a two-layer single-sided surface, that is, a dual-layered double-sided surface that is not limited to a dual-layer.
- the present invention is not limited to an optical disk having two recording layers as described above, but may be a multilayer optical disk having three or more layers.
- an opposite track path method or a parallel track path method in a two-layer type optical disk may be used.
- FIG. 2 is a block diagram conceptually showing the basic configuration of the information recording apparatus according to the present embodiment.
- the information recording apparatus 1 includes an optical pickup 501, a spindle motor 502, a head amplifier 503, a driver / strategy circuit 504, a knife 505, a DVD modulator 506, Data ECC (Error Correction Code) generator 507, buffer 508, interface 509, sum generator 520, demodulator 521, pit data ECC circuit 522, dropout detector 523, and push-pull generator 530, LPF (Low Pass Fi Iter) 531, BPF (Band Pass Filter) 532, HPF (High Pass Filter) 533, TE (Tra eking Error) detector 534, Poble detector 535, LPP ( (Land Pre Pit) detector 536, FE (Focus Error) detector 537, servo unit 540, recording clock generator 541, LPP data detector 542, detrack detector 550, CPU 560, and memory 570 With the recording power monitor 580, .
- LPF Low Pass Fi Iter
- BPF Band Pass Filter
- HPF High Pass Fil
- the optical pickup 501 is a specific example of “recording means” in the present invention, and performs recording or reproduction on the optical disk 100, and includes a semiconductor laser device, various lenses, an actuator, and the like. Is done. More specifically, the optical pickup 501 irradiates the optical disc 100 with a light beam LB such as a laser beam at the first power as read light at the time of reproduction, and modulates the optical disk 100 at the second power as write light at the time of recording. While irradiating. Light pick The up 501 is configured to be able to move in the radial direction of the optical disc 100 or the like according to tracking servo by an actuator, a slider, or the like (not shown) driven by the control of the servo unit 540. In addition, under the control of the servo unit 540, the focus of the light beam LB is changed according to the focus servo, so that the focus can be controlled.
- a light beam LB such as a laser beam at the first power as read light at the time of
- the optical pickup 501 includes a four-division detection circuit, not shown.
- the quadrant detection circuit divides the reflected light of the light beam B into four areas A, B, C, and D shown in the upper part of FIG. 2, and outputs signals corresponding to the light amounts of the respective areas.
- the spindle motor 502 is configured to rotate the optical disc 100 at a predetermined speed while receiving spindle servo by the servo unit 540 or the like.
- the head amplifier 503 amplifies each output signal of the optical pickup 501 (that is, the reflected light of the light beam B), and reads the divided read signal a corresponding to the area A, the divided read signal b corresponding to the area B, The divided read signal c corresponding to the area C and the divided read signal d corresponding to the area D are output.
- the driver / strategy circuit 504 drives a semiconductor laser provided in the optical pickup 501 so that the optimum recording laser power can be determined. Thereafter, the driver / strategy circuit 504 is configured to drive the semiconductor laser of the optical pickup 501 with the optimum recording laser power determined by the OPC (Optical Power Calibration) process during data recording. At the time of this data recording, the recording laser power is modulated according to the recording data.
- OPC Optical Power Calibration
- the OPC process is a process of detecting an optimum recording laser power (ie, a calibration of the recording laser power). More specifically, for example, in the OPC area provided on the optical disc 100, for example, short pits corresponding to 3T pulses and long pits corresponding to 11T pulses are alternately arranged together with a non-recording section of the same length. By forming and performing this with, for example, 16 different laser powers, the influence of asymmetry is minimized, and the recording laser power for recording is obtained so as to obtain the best reproduction quality.
- the "asymmetry" is a phenomenon in which short pits or long pits gradually increase or decrease by the same amount before and after the length of the optical disk during mass production.
- the buffer 505 stores recording data modulated by the DVD modulator 506 and is configured to be able to output the recording data to the driver / strategy circuit 504.
- the DVD modulator 506 is configured to perform DVD modulation on recording data and output the modulated data to the buffer 505.
- DVD modulation for example, 8-16 modulation may be performed.
- the data ECC generator 507 adds a code for error correction to the recording data input from the interface 509. More specifically, an ECC code is added for each predetermined block unit (for example, ECC cluster unit), and output to the DVD modulator 508.
- predetermined block unit for example, ECC cluster unit
- the buffer 508 buffers the recording data input from the interface 509 and outputs it to the appropriate data ECC generator 507.
- the pit data is reproduced data output from the ECC circuit 522 is buffered and output to an external output device via the interface 509 as appropriate.
- the interface 509 is configured to accept input of recording data from an external input device and output reproduction data to an external output device.
- ECC is added to the recording signal input from the interface via the buffer 508 by the data ECC generator 507, and then DVD modulation is performed by the DVD modulator 506. Can be hung.
- the optical pickup By being output to the driver / strategy circuit 504 via 5, the optical pickup is driven with the optimum recording laser power and is recorded on the optical disc 100.
- the sum generation circuit 520 adds the divided read signals a, b, c, and d to generate a sum read signal S
- the total reading signal SRF is a signal indicating the length of the recording mark.
- the demodulator 521 reproduces pit data based on the sum read signal SRF. More specifically, the demodulator 521 generates reproduced data by demodulating the reproduced pit data using a predetermined table, for example, using a reproduction synchronization signal as a reference position. For example, when 8-16 modulation is employed as a modulation method, a process of converting 16-bit pit data into 8- bit reproduced data is performed. Then, a descrambling process for rearranging the order of the reproduced data according to a predetermined rule is executed, and the processed reproduced data is output.
- the pit data ECC circuit 522 performs an error correction process, an interpolation process, and the like on the reproduction data generated by the demodulator 521. Thereafter, the playback data is output to the interface 509 via the buffer 508, and is played back on an external output device such as a speaker or a display.
- the dropout detector 523 is configured to be able to detect whether or not the sum reading signal SRF is output from the sum generator 520. Then, it outputs to the detrack detector 550 the detection result, that is, the fact that the total reading signal SRF is output or not output.
- the push-pull signal generator 530 calculates (a + d)-(b + c) using the divided read signal, and generates a push-pull signal.
- the component (a + d) corresponds to the regions A and D on the left side in the reading direction, while the component (b + c) corresponds to the regions B and C on the right side in the reading direction. Then, the value of the push-up signal indicates the relative positional relationship between the light beam B and the pit.
- the LPF 531 cuts the signal component on the high frequency side of the push-pull signal output from the push-pull generator 530, and outputs the signal component on the low frequency side to the TE detector 534. That is, here, a tracking error signal component is extracted and output to the TE detector 534.
- the BPF 532 extracts a signal component related to a pebble signal from the push-pull signal outputted from the push-pull generator 530, and outputs it to the pebble detector 535.
- the HPF 533 cuts the signal component on the low frequency band side of the push-pull signal output from the push-pull generator 530, and outputs the signal component on the high frequency band side to the LPP detector 536. That is, here, the LPP signal is extracted and output to the LPP detector 536.
- the TE detector 534 detects a tracking error from a tracking error signal component of the push-pull signal input via the LPF 531. Then, a tracking error signal is output to servo unit 540. The tracking error signal is also output from the detrack detector 550.
- the cobble detector 535 detects a cobble signal component of the push-pull signal input via the BPF 532, and based on the cycle of the cobble signal, for example, Detects relative position information based on a slot unit corresponding to a natural number times the length of one period of the pebble signal.
- the relative position information is output to the recording clock generator 541.
- the relative position information is also output to the servo unit 540 and the LPP data detector 542.
- the LPP detector 536 detects an LPP signal component of the push-pull signal input via the HPF 533, and based on the LPP signal, detects a pre-signal indicated by an LPP (land pre-pit). Detect format address information. Then, the pre-format address information is output to the recording clock generator 541. The preformat address information is also output to the servo unit 540 and the LPP data detector 542.
- the FE detector 537 detects a focus error from the sum read signal SRF output from the sum generator 520 based on the signal intensity distribution in the quadrant detector. Then, a focus error signal is output to servo unit 540. The focus error signal is also output to the detrack detector 550.
- the servo unit 540 moves the objective lens of the optical pickup 501 based on a tracking error signal, a focus error signal, a wobble signal, an LPP signal, and the like obtained by processing the light reception result of the optical pickup 501. It executes various servo processes such as tracking control, focus control or spindle control.
- the recording clock generator 541 performs data recording based on the period (or relative position information) of the cobble signal output from the cobble detector 535 and the preformat address information output from the LPP detector 536. Generates and outputs a timing signal indicating the reference clock to perform Therefore, it is possible to specify the recording start position at the time of data recording, regardless of whether or not the management unit force of the preformat address information is also started.
- the LPP data detector 542 is configured to be able to acquire various management information and the like necessary for recording from the LPP signal output from the LPP detector 536. For example, it is configured to be able to acquire recommended recording power and recommended strategy recorded by LPP as described below.
- the detrack detector 550 is configured to be able to detect whether or not detrack has occurred while data is being recorded on the optical disc 100. More specifically, a tracking error signal is input from the TE detector 534 to the detrack detector 550, and a focus error signal is input from the FE detector 537 to the detrack detector 550. It is configured to be able to monitor whether it is large or not.
- the detrack detector 550 is configured to be able to monitor whether or not the sum read signal SRF output from the sum generator 520 is input as an output of the dropout detector 523. Further, the detrack detector 550 is configured to be able to compare the timing at which the optical pickup 501 performs recording (or the period of the wobble signal) with the timing signal generated by the recording clock generator 541. Further, the optical pickup 501 is configured to monitor preformat address information (or a physical address value) at a position where the optical pickup 501 records. Furthermore, if the optical disk 100 is an optical disk having a plurality of recording layers, it is preferable that the optical disk 100 is configured to be able to detect a layer flag for identifying each layer.
- the CPU 560 instructs each means such as a driver / strategy circuit 504, a servo unit 540, an LPP data detector 542, a detrack detector 550, and the like, in order to detect the optimum recording laser power.
- the entire information recording device 1 is controlled by outputting a system command. Further, it is preferable that, when the occurrence of detrack is input from the detrack detector 550, a command to stop the subsequent data recording is output to the optical pickup 501 or the like.
- software for operating the CPU 560 is stored in an internal or external memory.
- the memory 570 is used for all data processing in the information recording device 1.
- the memory 570 is composed of a ROM area for storing programs for operating these recorder devices, a buffer area for compressing and decompressing video data, and a RAM area for storing variables necessary for program operation. Is done.
- the recording power monitor 580 monitors the amount of laser light LB emitted from the optical pickup 501 at the time of the recording operation, reflected from the recording surface of the optical disc 100.
- the monitored reflected light amount is referred to when adjusting the recording laser power in ROPC (Running OPC) for correcting the recording laser power while performing the recording operation.
- ROPC Heating OPC
- reflection If the light amount is at a predetermined level, an instruction is output to the driver / strategy circuit 504 to irradiate the laser beam LB with a predetermined recording laser power.
- the driver / strategy circuit 504 corrects the laser beam LB (specifically, the recording laser power, waveform, etc.) based on the instruction from the recording power monitor 580.
- FIG. 3 is a flowchart conceptually showing the flow of the operation principle of the information recording apparatus according to the present embodiment.
- the optical disc 100 to be recorded is loaded into the information recording device 1, and various necessary management data and the like are read. Specifically, a seek operation is performed by the optical pickup 501 under the control of the CPU 560, and various management data necessary for the recording process on the optical disc 100 is obtained from, for example, the lead-in area 102 or the like. Based on this management data, data is recorded on the optical disc 100 via the interface 509 under the control of the CPU 560, for example, in response to an instruction from an external input device or the like.
- step S101 a recording operation is performed on the L0 layer (step S101).
- the recording laser power at the time of the recording operation is preferably an optimum recording laser power calculated by OPC performed on the OPC area of the L0 layer.
- data representing the recording area of the L0 layer in which the data is recorded may be recorded in the memory 570 which is a specific example of the “storage means” in the present invention.
- the data may be recorded on the optical disk 100 itself.
- step S102 it is determined whether or not the recording on the L1 layer is performed. That is, the recording of data on the L0 layer ends, and it is determined whether or not data is subsequently recorded on the L1 layer.
- step S109 when it is determined that recording on the L1 layer is not performed (step S102: No), it is determined whether or not the recording operation is to be ended (step S109). As a result of this determination, when it is determined that the recording operation is not to be ended (step S109: No), the process returns to step S101 again, and the recording operation on the L0 layer is continuously performed. On the other hand, when it is determined that the recording operation is to be ended (Step S109: Yes), the recording operation is ended. When the recording operation is completed For example, the finalizing process may be performed, or the optical disk 100 may be ejected.
- step S102 when it is determined that recording on the L1 layer is to be performed (step S102: Yes), the control of the CPU 560, which is a specific example of “detection means” in the present invention, is subsequently performed.
- the eccentricity of the optical disc 100 is detected below (step S103).
- the laser beam LB is focused on a predetermined recording track of the L0 layer
- the laser beam LB is focused on the L1 layer in a state where the position of the optical pickup 501 is fixed and the tracking servo is opened.
- the number of recording tracks traversed by the laser beam LB may be detected as the amount of eccentricity.
- the eccentricity may be detected from a positional relationship between a predetermined recording point on the L0 layer and a recording point on the L1 layer corresponding to the predetermined recording point.
- a plurality of recording points existing on a predetermined recording track of the L0 layer and a recording track where the recording point of the L1 layer corresponding to the recording point is located are compared, and the respective recording tracks are compared.
- the eccentricity may be detected from the difference.
- the data corresponds to the recording area of the L0 layer where the data has been recorded.
- the address information of the recording area of the L1 layer and the address information of the recording area of the L1 layer corresponding to the recording area of the L0 layer where data is not recorded are calculated (step S104).
- FIG. 4 is a plan view conceptually showing an optical disk having eccentricity
- FIG. 5 is a conceptual diagram showing an operation when the information recording apparatus according to the present embodiment calculates address information on the optical disk.
- step S104 of FIG. 4 it is assumed that data is recorded from the first track of the L0 layer to the Nth track toward the outer periphery.
- the optical disk has no eccentricity, all the recording areas below the Nth track of the L1 layer correspond to the L0 layer where no data is recorded. Only On the other hand, if the optical disk has eccentricity, as shown in FIG. 4 (b), even if the recording area is below the Nth track of the L1 layer, the recording area corresponding to the recorded L0 layer is Indicates that there is a recording area corresponding to the unrecorded L0 layer.
- address information corresponding to the boundary between the recording area of the L1 layer corresponding to the L0 layer on which the data has been recorded and the recording area of the L1 layer corresponding to the L0 layer on which the data has not been recorded (specifically, Specifically, a physical address indicated by the preformat address information is calculated.
- This address information corresponds to a specific example of “position information” in the present invention.
- the address of the intersection between the Nth track of the L0 layer and each recording track of the L1 layer is calculated.
- the Nth track of the L0 layer is shown as being approximated by one concentric circle, and the recording track of the L1 layer is shown as a spiral recording track.
- the recording tracks of the L0 layer are also distributed spirally.
- the intersection of the Nth track of the L0 layer and each recording track of the L1 layer is determined by the physical addresses “Adl”, “Ad2 ,,”, “Ad3,”, “Ad4” on the L1 layer. ",” Ad5, ..., “Ad6, ...,” Ad7 ".
- Adl physical addresses
- Ad2 physical addresses
- Ad3 Ad5
- Ad6 ...
- Ad7 Ad7
- the optical disk 100 may be virtually arranged on a predetermined coordinate axis and a mathematical method may be used. Specifically, for example, when the L0 layer and the L1 layer are placed on one coordinate axis, the L0 layer and the L1 layer (specifically, the Nth track of the L0 layer and the Nth track of the L1 layer) are eccentric to each other. The positional relationship is such that the translation has been performed by a certain amount (or the rotation has been further reduced). Therefore, the physical address of the boundary can be calculated by mathematical calculation on the coordinate axis.
- the physical address of each point on the L1 layer corresponding to each point on the Nth track of the L0 layer is directly It may be calculated directly.
- the laser beam LB focused on a predetermined point on the Nth track of the L0 layer is focused on the L1 layer with the tracking servo open (that is, an interlayer jump is performed), and the laser beam LB is focused.
- the address of a predetermined point on the L1 layer that has entered is the physical address of the boundary shown in FIG.
- management data included in a file system of the optical disc 100 or the like may be used to identify the recording area of the LO layer in which the data is recorded.
- data indicating the recording area of the L0 layer where the data is recorded is recorded in the memory 570 or the like, the data may be used.
- the present invention is not limited to the calculation of the address information as shown in Figs. Any device that calculates address information that indicates a recording area of the L1 layer corresponding to the recorded L0 layer is included in the scope of the present invention. Also, if address information indicating the recording area of the L1 layer corresponding to the L0 layer on which data has been recorded can be calculated, indirectly, the recording area of the L1 layer corresponding to the L0 layer on which no data has been recorded can be calculated. Can be calculated. Further, the present invention is not limited to the address information, and may be configured to obtain various types of information indicating a recording area of the L1 layer corresponding to the L0 layer on which data has been recorded.
- step S105 recording of data in the L1 layer is started again.
- the CPU 560 under the control of the CPU 560, it is determined whether or not to record data in the recording area of the L1 layer corresponding to the recorded L0 layer (step S105).
- the determination is made based on the address information calculated in step S104.
- step S105 when it is determined that data is to be recorded in the recording area of the L1 layer corresponding to the recorded L0 layer (step S105: Yes), one of the "control means" in the present invention is specified. Under the control of the example driver / strategy circuit 504, data is recorded at a predetermined recording laser power P1 (step S106).
- step S105 when it is determined that data is to be recorded in the recording area of the L1 layer corresponding to the unrecorded L0 layer (step S105: No), the predetermined recording is performed under the control of the driver Z strategy circuit 504. Record data with laser power P2.
- the recording laser powers P1 and P2 are set for the ⁇ PC area of the L1 layer.
- the recording laser power obtained by the obtained PC may be used.
- it may be configured to obtain the other recording laser power by multiplying by a predetermined ratio or the like.
- a predetermined recording laser power may be used.
- the information indicating the predetermined recording laser power and the above-mentioned ratio may be recorded on the optical disc 100, or may be recorded on the memory of the information recording device 1. May be.
- each of the recording laser powers P1 and P2 may have a different output power of the laser light LB, or may have a different strategy for defining the waveform of the laser light LB. That is, the operation of the driver / strategy circuit 504 may be configured to adjust the laser light LB so as to switch the output power, or may be configured to adjust the laser light LB so as to change the pulse waveform.
- the driver / strategy circuit 504 may be configured to adjust the laser light LB so as to switch the output power, or may be configured
- the configuration when performing ROPC (Running OPC), the configuration may be such that the level of the amount of reflected light that is the source of correction of the recording laser power is changed. That is, the recording power monitor 580 may be configured to monitor and change the level of the amount of reflected light referred to when correcting the recording laser power.
- FIG. 6 is a graph conceptually showing the relationship between the recording laser power and the physical address of the L1 layer when the information recording apparatus according to the present embodiment switches the recording laser power.
- the recording laser power is switched according to the obtained address information.
- the recording laser power P1 is used. Record. Then, after the physical address of the recording area to be recorded exceeds “Ad4”, the recording laser power is switched to P2, and the recording operation is continued up to the recording area with the physical address of “Ad3”. Then, after the physical address of the recording area to be recorded exceeds “Ad5”, the recording laser power is switched again to P1, and the recording operation is continued up to the recording area of the physical address disk S “Ad2”.
- the switching processing of the recording laser power is performed earlier than the normal switching timing by the time. It may be configured as follows. For example, if switching of the recording laser power requires 100 xs, the switching process must be performed 100 ⁇ s before reaching the boundary for switching (or the laser beam LB is irradiated on the boundary for switching). It may be configured to do so. Specifically, in the recording area of the physical addresses "Ad4" to "Ad3", while recording data with the recording laser power P2, the recording area of the physical address "Ad3" corresponding to the boundary is irradiated with laser light. The switching of the recording laser power may be performed 100 ⁇ s before. In this case, the feedback time constant included in the switching instruction output from the CPU 560 to the driver / strategy circuit 504 may be configured to be advanced by 100 xs.
- step S108 it is determined whether to end the data recording operation on the L1 layer.
- step S108 when it is determined that the operation of recording data on the L1 layer is to be terminated (step S108: Yes), it is determined whether or not the recording operation is to be terminated (step S109). On the other hand, when it is determined that the data recording operation on the L1 layer is not to be terminated (step S108: No), the recording operation is continued while appropriately switching the recording laser power according to the recording area to be recorded.
- the recording laser power can be appropriately switched according to the recording state of the L0 layer. Become. Therefore, regardless of whether data is recorded in the L0 layer or not, data can be appropriately recorded in the L1 layer. For this reason, the recording quality of the data recorded on the L1 layer can be improved, and as a result, the reproduction quality when reproducing the recorded data can also be improved.
- the recording level is considered in consideration of the eccentricity that may occur in the two-layer type optical disc 100. Switching the power.
- the maximum allowable amount of eccentricity is set to 70 ⁇ in the standard of the DVD as a specific example of the optical disc 100.
- the width in the radial direction of one recording track is approximately 0.7 to 0.74 ⁇ , and from the viewpoint of appropriately recording data on the L1 layer considering the state of the L0 layer.
- the existence of this eccentricity cannot be ignored.
- the recording laser power can be switched with due consideration of the eccentricity, so that data can be recorded more appropriately and the recording quality can be further improved. It has the great advantage that it can be done.
- the recording area of the L1 layer corresponding to the L0 layer where data is recorded and the recording area of the L1 layer corresponding to the L0 layer where data is not recorded Can be identified in advance. Therefore, it is not necessary to identify the recording state of the L0 layer when actually recording data on the L1 layer, and the recording laser power can be appropriately switched without affecting the processing performance of the recording operation.
- the operation of switching the recording laser power when recording data on the corresponding L1 layer according to whether data is recorded on the recording area of the L0 layer has been described.
- the recording laser power for recording data on the corresponding L0 layer may be switched according to whether or not data is recorded on the recording area of the L1 layer. That's what it's all about.
- the optical disk 100 is described as an example of the information recording medium, and the recorder related to the optical disk 100 is described as an example of the information recording device.
- the present invention is not limited to the optical disk and the recorder thereof.
- the present invention can also be applied to other types of information recording media compatible with other high-density recording or high transfer rates, and recorders thereof.
- Information recording medium, information recording apparatus and method, information distribution apparatus and method according to the present invention can be used for an information recording medium such as a DVD and an information recording apparatus and method such as a DVD recorder. Further, for example, the present invention can also be used for an information recording device mounted on various consumer or business computer devices or connectable to various computer devices.
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JP2002216361A (ja) * | 2001-01-22 | 2002-08-02 | Sharp Corp | 光ディスク及び光記録再生装置 |
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JP2002216361A (ja) * | 2001-01-22 | 2002-08-02 | Sharp Corp | 光ディスク及び光記録再生装置 |
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