JPWO2005122151A1 - Information recording apparatus and method, and computer program - Google Patents

Abstract

The information recording apparatus (1) records information on an information recording medium (100) including a first recording layer (L0) and a second recording layer (L1) that record recording information by irradiating an adjustable laser beam. And a recording area of the second recording layer corresponding to the recorded first recording layer based on the eccentricity (α) between the recording means (501) and the first recording layer and the second recording layer Calculation means (560) for calculating position information indicating the position of the recording medium, and control means (504) for controlling the recording means so as to adjust the laser beam based on the position information when recording information is recorded on the second recording layer. ).

Description

  The present invention relates to an information recording apparatus and method such as a DVD recorder, and a computer program for causing a computer to function as such an information recording apparatus.

  For example, in 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. Multilayer, double layer, or multiple layer type optical discs have also been developed. More specifically, the two-layer type optical disc is positioned as the first layer on the most front side (that is, the side closer to the optical pickup) when viewed from the laser light irradiation side when recording is performed by the information recording apparatus. It has a first recording layer (referred to as “L0 layer” in this application as appropriate), and further has a transflective film located on the far side (that is, the side far from the optical pickup). As the second layer, it has a second recording layer (referred to as “L1 layer” in the present application as appropriate) located on the back side of the transflective film via an intermediate layer such as an adhesive layer, and further on the back side. A reflective film located on the surface. When producing such a multilayer information recording medium, the L0 layer and the L1 layer are formed separately, and finally the respective recording layers are bonded together, so that the two-layer type optical disc can be manufactured at low cost. Can be manufactured.

JP 2002-170339 A

  In such a two-layer type optical disc, information is recorded with a recording laser power suitable for each recording layer. This recording laser power is mainly obtained by OPC (Optimum Power Calibration). However, the two-layer type optical disc has a technical problem that the recording characteristics of the second recording layer differ depending on the recording state of the first recording layer. Specifically, there is a technical problem that the recording characteristics of the second recording layer differ depending on whether information is recorded or not recorded on the first recording layer. In particular, since an eccentricity may occur in a bonded optical disc, it is difficult or impossible to discriminate the state of the other recording layer from the recording track or physical address of one recording layer. Has technical problems.

  The present invention has been made in view of, for example, the above-described conventional problems. For example, an information recording apparatus and method, and a computer that can appropriately record information on a multilayer information recording medium are provided in this way. An object of the present invention is to provide a computer program that functions as a simple information recording apparatus.

(Information recording device)
In order to solve the above problems, an information recording apparatus of the present invention records the recording information on an information recording medium including a first recording layer and a second recording layer that record the recording information by irradiating an adjustable laser beam. Recording on the second recording layer corresponding to the recording area of the first recording layer on which the recording information has been recorded based on the recording means for recording and the amount of eccentricity between the first recording layer and the second recording layer A calculation means for calculating position information indicating the position of the area; and a control for controlling the recording means to adjust the laser beam based on the position information when the recording information is recorded on the second recording layer. Means.

  According to the information recording apparatus of the present invention, various kinds 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. In particular, various kinds of recorded information can be recorded by irradiating laser light adjusted appropriately.

  In the present invention, in particular, the 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 can be calculated by the operation of the calculating means. 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 where the recording information has already been recorded, but indirectly, the recording information has not yet been recorded. This also indicates the position of the recording area of the second recording layer corresponding to the recording area of the first recording layer not present. When recording information is recorded on the second recording layer, the recording means is controlled to adjust the laser beam based on the position information by the operation of the control means. That is, the recording information is recorded in 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, or the recording of the first recording layer in which the recording information is not yet recorded The laser beam (or the laser beam irradiation condition) is adjusted according to whether the recording information is recorded in the recording region of the second recording layer corresponding to the region. This laser beam is preferably adjusted to an appropriate state for recording the record information.

  Therefore, regardless of what recording state the first recording layer is in, the recording information is recorded on the second recording layer with the laser light appropriately adjusted by referring to the position information calculated by the calculating means. It becomes possible. Of course, the recording information can be recorded on the first recording layer by the laser light adjusted appropriately. This makes it possible to improve the recording quality of the recording information recorded on the information recording medium (particularly, the second recording layer). And when reproducing the recorded information, the reproduction quality can be improved.

  In the present invention, recording information can be recorded while adjusting the laser beam in consideration of the eccentricity of the information recording medium. Accordingly, it is possible to eliminate an adverse effect of eccentricity that may occur in the two-layer type information recording medium and to realize an appropriate recording operation.

  As a result, according to the information recording apparatus of the present invention, it is possible to appropriately record recording information on a multilayer type (particularly, two-layer type) information recording medium.

  In one aspect of the information recording apparatus of the present invention, the calculation means further includes a detection means for detecting the amount of eccentricity.

  According to this aspect, it is possible to suitably calculate the position information using the amount of eccentricity detected by the operation of the detection means.

  In another aspect of the information recording apparatus of the present invention, the calculation means further includes a storage means for storing a position of a recording area of the first recording layer in which the recording information has been recorded.

  According to this aspect, the 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 is already recorded is detected based on the position stored by the storage means. be able to. 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.

  In another aspect of the information recording apparatus of the present invention, the control means, based on the position information, records the recording information in a recording area of the second recording layer corresponding to the recorded first recording layer. The laser light according to the first setting, which is the laser light for recording the information, and the laser light for recording the information on the second recording layer corresponding to the first recording layer where the information is not recorded. The recording unit is controlled so as to adjust the laser light by switching between the laser light according to the second setting.

  According to this aspect, the laser light can be adjusted relatively easily by switching between the two types of laser light based on the position information.

  In the aspect of the information recording apparatus that switches between the laser beam according to the first setting and the laser beam according to the second setting as described above, the control unit is configured to switch either the first or second after the switching. Based on the time when one of the laser beams is irradiated onto the information recording medium, the laser beam is switched quickly in advance by the time required for switching between the laser beam according to the first setting and the laser beam according to the second setting. The recording means is controlled as follows.

  With this configuration, it becomes possible to adjust the laser beam in accordance with actual recording. In addition, laser light can be suitably adjusted (particularly, switching of the laser light) irrespective of the recording speed of the information recording apparatus, and the recording characteristics can be further improved.

  In another aspect of the information recording apparatus of the present invention, the control means controls the recording means so as to adjust at least one of the strategy for controlling the output power of the laser light and the waveform of the laser light.

  According to this aspect, since it is sufficient to adjust at least one of the output power and the strategy, the laser light can be adjusted relatively easily.

(Information recording method)
According to the information recording method of the present invention, in order to solve the above-described problem, the recording is performed on an information recording medium including a first recording layer and a second recording layer for recording information by irradiating an adjustable laser beam. An information recording method in an information recording apparatus comprising a recording means for recording information, wherein the recording information is recorded on the basis of an eccentric amount between the first recording layer and the second recording layer. And calculating the position information indicating the position of the recording area of the second recording layer corresponding to the recording area of the second recording layer, and when recording the recording information on the second recording layer, the laser based on the position information A control step of controlling the recording means so as to adjust the light.

  According to the information recording method of the present invention, various benefits similar to those of the information recording apparatus of the present invention described above can be obtained.

  Incidentally, in response to the various aspects of the information recording apparatus of the present invention described above, the information recording method according to the present invention can also adopt various aspects.

(Computer program)
In order to solve the above problems, a computer program of the present invention is a computer program for information recording control for controlling a computer provided in the above-described information recording apparatus of the present invention (including various aspects thereof), The computer is caused to function as at least part of the recording unit, the calculating unit, and the control unit.

  According to the computer program of the present invention, the computer program is read from a recording medium such as a ROM, a CD-ROM, a DVD-ROM, and a hard disk that stores the computer program, and executed, or the computer If the 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.

  Incidentally, in response to the various aspects of the information recording apparatus of the present invention described above, the computer program of the present invention can also adopt various aspects.

  In order to solve the above problems, a computer program product in a computer-readable medium clearly embodies program instructions executable by a computer provided in the information recording apparatus (including various aspects thereof) of the present invention. The computer is caused to function as at least part of the recording unit, the calculating unit, and the control unit.

  According to the computer program product of the present invention, when the computer program product is read into a computer from a recording medium such as a ROM, CD-ROM, DVD-ROM, or hard disk storing the computer program product, or, for example, by a transmission wave. If a computer program product is downloaded to a computer via communication means, at least a part of the recording means, calculation means, and control means of the present invention described above can be implemented relatively easily. More specifically, the computer program product includes computer-readable code (or computer-readable instructions) that functions as at least part of the recording unit, the calculation unit, and the control unit of the present invention described above. May be.

  These effects and other advantages of the present invention will become apparent from the embodiments described below.

  As described above, according to the information recording apparatus or method of the present invention, the recording unit, the calculation unit and the control unit, or the calculation step and the control step are provided. Therefore, the laser beam can be adjusted as appropriate according to the state of the first recording layer. As a result, it is possible to improve the recording characteristics when recording information on the second recording layer, and to appropriately record information on the multilayer information recording medium.

1 is a schematic plan view showing a basic structure of an optical disc having a plurality of recording areas related to an information recording medium to be subjected to a recording operation of an embodiment of the information recording apparatus of the present invention, a schematic cross-sectional view of the optical disc, and corresponding FIG. 2 is a schematic conceptual diagram of a recording area structure in the radial direction attached. It is a block diagram which shows the basic composition of the Example which concerns on the information recording device of this invention. It is a flowchart which shows notionally the flow of the whole recording operation | movement of the information recording device based on a present Example. It is a top view which shows notionally the optical disk which has eccentricity. It is a top view which shows notionally the operation | movement at the time of the information recording device based on a present Example calculating address information on an optical disk. It is a graph which shows notionally the relationship between recording laser power and the physical address of L1 layer in the case of the switching operation of recording laser power of the information recording device concerning a present Example.

Explanation of symbols

1 Information Recording Device 100 Optical Disk 501 Pickup 504 Driver / Strategy Circuit 560 CPU
570 memory

  Hereinafter, the best mode for carrying out the present invention will be described for each embodiment in order with reference to the drawings.

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

  First, with reference to FIG. 1, the basic structure of an optical disc relating to an information recording medium to be subjected to a recording operation of an embodiment of the information recording apparatus of the present invention will be described. FIG. 1A is a schematic plan view showing the basic structure of an optical disc having a plurality of recording areas related to an information recording medium that is a target of a recording operation of the embodiment of the information recording apparatus of the present invention. FIG. 1B is a schematic cross-sectional view of the optical disc and a schematic conceptual view of the recording area structure in the radial direction associated therewith.

  As shown in FIGS. 1 (a) and 1 (b), an optical disc 100 is a lead according to the present embodiment centered on a center hole 1 on a recording surface on a disc main body having a diameter of about 12 cm as in the case of a DVD. An in area 101, a data area 102, a lead out area 103, or a middle area 104 are provided. A recording layer or the like is laminated on the transparent substrate 200 of the optical disc 100, for example. In each recording area of the recording layer, for example, tracks 10 such as a groove track and a land track are alternately provided in a spiral shape or a concentric shape around the center hole 1. On the track 10, data is divided and recorded in units of ECC blocks 11. The ECC block 11 is a data management unit based on a preformat address in which recorded information can be error-corrected.

  The present invention is not particularly limited to an optical disc having such three areas. For example, even if the lead-in area 101, the lead-out area 103, or the middle area 104 does not exist, a data structure described below can be constructed. Further, as described later, the lead-in area 101, the lead-out 103, or the middle area 104 may be further subdivided.

  In particular, as shown in FIG. 1B, the optical disc 100 according to the present embodiment includes, for example, a L0 layer that constitutes an example of first and second recording layers according to the present invention, which will be described later, on a transparent substrate. The L1 layer is laminated. At the time of recording / reproduction of such a two-layer type optical disc 100, depending on which recording layer the focusing position of the laser beam LB irradiated from the upper side to the lower side in FIG. Recording / reproduction is performed in the L0 layer or recording / reproduction is performed in the L1 layer. Further, the optical disc 100 according to the present embodiment is not limited to the two-layer single side, that is, the dual layer, but may be the two-layer double side, that is, the dual layer double side. Furthermore, as described above, the optical disk is not limited to an optical disk having two recording layers, and may be a multilayer optical disk having three or more layers. Also, an opposite track path method in a two-layer type optical disk or a parallel track path method may be used.

  Next, an embodiment according to the information recording apparatus of the present invention will be described with reference to FIGS.

(Basic configuration of information recording device)
First, the basic configuration of the information recording apparatus according to the present embodiment will be described with reference to FIG. FIG. 2 is a block diagram conceptually showing the basic structure of the information recording apparatus in the example.

  As shown in FIG. 2, the information recording apparatus 1 includes an optical pickup 501, a spindle motor 502, a head amplifier 503, a driver / strategy circuit 504, a buffer 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, push-pull generator 530, LPF (Low Pass) Filter) 531, BPF (Band Pass Filter) 532, HPF (High Pass Filter) 533, TE (Tracking Error) detector 534, wobble detector 535, LPP (Land Pre Pit) detector 536, FE (Focus Error) detector 537, servo unit 540, and recording clock generator 41, a LPP data detector 542, a de-track detector 550, a CPU 560, has a memory 570, a recording power monitor 580.

  The optical pickup 501 is a specific example of the “recording unit” in the present invention, and performs recording or reproduction on the optical disc 100, and includes a semiconductor laser device, various lenses, an actuator, and the like. More specifically, the optical pickup 501 irradiates the optical disk 100 with a light beam LB such as a laser beam at a first power as read light during reproduction and modulates with a second power as write light during recording. Irradiate while. The optical pickup 501 is configured to be movable in the radial direction of the optical disc 100 in accordance with tracking servo by an actuator (not shown), a slider, or the like that is driven by the control of the servo unit 540. In addition, by controlling the servo unit 540, the focus of the light beam LB is changed according to the focus servo so that focus control is possible.

  Furthermore, the optical pickup 501 includes a four-divided detection circuit (not shown). The four-divided detection circuit divides the reflected light of the light beam B into four regions A, B, C, and D shown in the upper part of FIG. 2 and outputs signals corresponding to the light amounts in the respective regions.

  The spindle motor 502 is configured to rotate the optical disc 100 at a predetermined speed while receiving spindle servo from 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 outputs the divided read signal a corresponding to the region A, the divided read signal b corresponding to the region B, and the region C. A corresponding divided read signal c and a divided read signal d corresponding to the region 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 an optimum recording laser power determined by OPC (Optical Power Calibration) processing during data recording. During this data recording, the recording laser power is modulated in accordance with the recording data.

  The OPC process is a process for detecting the optimum recording laser power (that is, 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 formed with no-recording sections having the same length. By performing this with, for example, 16 different laser powers, the recording laser power for recording is calculated so as to minimize the influence of asymmetry and obtain the best reproduction quality. “Asymmetry” is a phenomenon in which short pits or long pits are gradually lengthened or shortened by the same amount before and after the length direction in mass production of an optical disc.

  The buffer 505 is configured to store the recording data modulated by the DVD modulator 506 and output it to the driver / strategy circuit 504.

  The DVD modulator 506 is configured to perform DVD modulation on the recording data and output it to the buffer 505. As DVD modulation, for example, 8-16 modulation may be performed.

  The data ECC generator 507 adds an error correction code to the recording data input from the interface 509. Specifically, an ECC code is added for each predetermined block unit (for example, ECC cluster unit), and is output to the DVD modulator 508.

  The buffer 508 buffers the recording data input from the interface 509 and outputs it to the data ECC generator 507 as appropriate. Further, the playback data output from the pit data ECC circuit 522 is buffered and output to an external output device through the interface 509 as appropriate.

  The interface 509 is configured to accept recording data input from an external input device and to output reproduction data to the external output device.

  Therefore, during normal data recording, ECC is added by the data ECC generator 507 to the recording signal input from the interface via the buffer 508, and then DVD modulation is performed by the DVD modulator 506. Then, by outputting to the driver / strategy circuit 504 via the buffer 505, the optical pickup is driven with the optimum recording laser power, and recording is performed on the optical disc 100.

  The sum generation circuit 520 includes an addition circuit that adds the divided read signals a, b, c, and d and outputs a sum read signal SRF. The total read signal SRF is a signal representing the length of the recording mark.

  The demodulator 521 reproduces pit data based on the total read signal SRF. More specifically, the demodulator 521 generates reproduction 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 adopted as the modulation method, processing for converting 16-bit pit data into 8-bit reproduction data is performed. Then, a descrambling process for rearranging the order of the reproduction data according to a predetermined rule is executed, and the processed reproduction data is output.

  The pit data ECC circuit 522 performs error correction processing, interpolation processing, and the like on the reproduction data generated by the demodulator 521. Thereafter, the reproduction data is output to the interface 509 via the buffer 508, and is reproduced on an external output device such as a speaker or a display.

  The dropout detector 523 is configured to detect whether or not the sum read signal SRF is output from the sum generator 520. Then, the detection result, that is, the fact that the total read signal SRF is outputted or not outputted is outputted to the detrack detector 550.

  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 areas A and D on the left side with respect to the reading direction, while the component (b + c) corresponds to the areas B and C on the right side with respect to the reading direction. The value of the push-pull signal represents 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, the tracking error signal component is extracted and output to the TE detector 534.

  The BPF 532 extracts a signal component related to the wobble signal from the push-pull signal output from the push-pull generator 530 and outputs the signal component to the wobble detector 535.

  The HPF 533 cuts the signal component on the low frequency side of the push-pull signal output from the push-pull generator 530 and outputs the signal component on the high frequency 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 the tracking error signal component in the push-pull signal input via the LPF 531. Then, a tracking error signal is output to the servo unit 540. This tracking error signal is also output to the detrack detector 550.

  The wobble detector 535 detects the wobble signal component of the push-pull signal input via the BPF 532 and, for example, has a length that is a natural number multiple of one period of the wobble signal based on the period of the wobble signal. Relative position information based on the slot unit corresponding to is detected. 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 the LPP signal component of the push-pull signal input via the HPF 533 and detects preformat address information indicated by the LPP (land pre-pit) based on the LPP signal. To do. The preformat 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 total read signal SRF output from the total generator 520 based on the signal intensity distribution in the quadrant detector. Then, a focus error signal is output to the 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 the tracking error signal, the focus error signal, the wobble signal, the LPP signal, and the like obtained by processing the light reception result of the optical pickup 501, thereby tracking control, Various servo processes such as focus control and spindle control are executed.

  The recording clock generator 541 generates a reference clock for data recording based on the period (or relative position information) of the wobble signal output from the wobble detector 535 and the preformat address information output from the LPP detector 536. The timing signal shown is generated and output. Therefore, it is possible to specify the recording start position regardless of whether the recording start position at the time of data recording is started from the management unit of the preformat address information.

  The LPP data detector 542 is configured to be able to acquire various management information necessary for recording from the LPP signal output from the LPP detector 536. For example, as described later, the recommended recording power and the recommended strategy recorded by the LPP can be acquired.

  The detrack detector 550 is configured to be able to detect whether or not detrack has occurred during data recording on the optical disc 100. More specifically, the detrack detector 550 receives a tracking error signal from the TE detector 534 and a focus error signal from the FE detector 537, and these signals are larger than a predetermined value. Whether or not can be monitored. Further, the detrack detector 550 is configured to be able to monitor whether there is an input of the total read signal SRF output from the total generator 520 as an output of the dropout detector 523. Further, the detrack detector 550 is configured to be able to compare the timing (or the wobble signal cycle) at which the optical pickup 501 performs recording with the timing signal generated by the recording clock generator 541. The preformat address information (or physical address value) at the position where the optical pickup 501 is recording can be monitored. Further, if the optical disc 100 is an optical disc having a plurality of recording layers, it is preferable that the layer flag for identifying each layer is configured to be detectable.

  In order to detect the optimum recording laser power, the CPU 560 instructs each means such as the driver / strategy circuit 504, the servo unit 540, the LPP data detector 542, the detrack detector 550, etc., that is, outputs a system command. As a result, the entire information recording apparatus 1 is controlled. In addition, it is preferable that when the occurrence of detracking 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. Normally, software for operating the CPU 560 is stored in an internal or external memory.

  The memory 570 is used in general data processing in the information recording apparatus 1. The memory 570 includes a ROM area in which a program for operating as a recorder device is stored, a buffer used for compressing / decompressing video data, and a RAM area in which variables necessary for the program operation are stored. .

The recording power monitor 580 monitors the amount of reflected light from the recording surface of the optical disc 100 of the laser beam LB emitted from the optical pickup 501 during the recording operation. The monitored amount of reflected light is referred to when adjusting the recording laser power during ROPC (Running OPC) in which the recording laser power is corrected while performing the recording operation. If the amount of reflected light is a predetermined level, an instruction is output to the driver / strategy circuit 504 so that the laser beam LB is irradiated with a predetermined recording laser power. As a result, the driver / strategy circuit 504 corrects the laser beam LB (specifically, recording laser power, waveform, etc.) based on an instruction from the recording power monitor 580 (operation principle of the information recording apparatus).
Subsequently, the operation principle of the information recording apparatus according to the present embodiment will be described with reference to FIG. FIG. 3 is a flowchart conceptually showing a flow of the operation principle of the information recording apparatus in the embodiment.

  First, as a premise of the recording operation, the optical disk 100 to be recorded is loaded into the information recording apparatus 1 and necessary various management data 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 recording processing on the optical disc 100 is acquired from the lead-in area 102, for example. 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 accordance with an instruction from an external input device or the like.

  Thereafter, as shown in FIG. 3, the recording operation is first performed in the L0 layer (step S101). Here, the recording laser power during the recording operation is preferably an optimum recording laser power calculated by OPC performed for the OPC area of the L0 layer. At this time, the 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 unit” in the present invention. Alternatively, this data may be recorded on the optical disc 100 itself.

  Then, during the recording operation to the L0 layer, it is determined whether or not to perform recording on the L1 layer (step S102). That is, it is determined whether or not to finish recording data in the L0 layer and subsequently record data in the L1 layer.

  As a result of this determination, if it is determined not to perform recording on the L1 layer (step S102: No), it is then determined whether or not the recording operation is to be terminated (step S109). As a result of this determination, if it is determined not to end the recording operation (step S109: No), the process returns to step S101 again, and the recording operation to the L0 layer is continued. On the other hand, when it is determined to end the recording operation (step S109: Yes), the recording operation is ended. When the recording operation is finished, for example, a finalizing process may be performed, or the optical disc 100 may be ejected.

  On the other hand, as a result of the determination in step S102, when it is determined to perform recording in the L1 layer (step S102: Yes), subsequently, under the control of the CPU 560 as a specific example of the “detection unit” in the present invention, The amount of eccentricity of the optical disc 100 is detected (step S103).

  Here, for example, after 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 tracking servo is opened while the position of the optical pickup 501 is fixed (that is, As a result, the number of recording tracks traversed by the laser beam LB may be detected as the amount of eccentricity. Alternatively, the amount of eccentricity may be detected from the 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. Specifically, for example, by comparing a plurality of recording points existing on a predetermined recording track of the L0 layer with a recording track where the recording point of the L1 layer corresponding to the recording point is located, the difference between the respective recording tracks is compared. More eccentricity may be detected.

  Thereafter, under the control of the CPU 560 as one specific example of the “calculation means” in the present invention, the recording of the L1 layer corresponding to the recording area of the L0 layer where the data has been recorded based on the eccentricity detected in step S103. The address information of the recording area of the L1 layer corresponding to the recording area of the L0 layer where the area and data are not recorded is calculated (step S104).

  Here, the calculation of the address information will be specifically described with reference to FIGS. FIG. 4 is a plan view conceptually showing an optical disc having eccentricity, and FIG. 5 conceptually shows an operation on the optical disc when the information recording apparatus according to this embodiment calculates address information. It is a top view.

  As shown in FIG. 4A, when the optical disc 100 is decentered, the L0 layer N-th track and the L1 layer N-th track that should be in the corresponding positions when viewed from the optical pickup 501 side. And its center is off. The amount “α” corresponding to this center shift is the amount of eccentricity.

  At this time, for example, it is assumed that data is recorded from the first track of the L0 layer to the Nth track toward the outer periphery. In this case, if the optical disc has no eccentricity, all the recording areas of the L1 layer below the Nth track correspond to the L0 layer in which no data is recorded. However, if the optical disk has eccentricity, as shown in FIG. 4B, the recording area and data corresponding to the L0 layer on which the data has already been recorded, even in the recording area below the Nth track of the L1 layer. A recording area corresponding to the unrecorded L0 layer exists. In step S104 of FIG. 3, the address information (specifically, the boundary between the recording area of the L1 layer corresponding to the L0 layer in which this data has been recorded and the recording area of the L1 layer corresponding to the L0 layer in which the data has not been recorded) (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.

  Specifically, as shown in FIG. 5, the address of the intersection between the Nth track of the L0 layer and each recording track of the L1 layer is calculated. Here, for convenience of explanation, the Nth track of the L0 layer is approximated by one concentric circle, and the recording track of the L1 layer is shown by a spiral recording track. Of course, it goes without saying that the recording tracks of the L0 layer are also distributed in a spiral shape.

  As shown in FIG. 5, the intersections of the Nth track of the L0 layer and each recording track of the L1 layer are the physical addresses “Ad1”, “Ad2”, “Ad3”, “Ad4”, “Ad5” on the L1 layer. , “Ad6”, “Ad7”. With this physical address as a boundary, the recording area of the L1 layer corresponding to the L0 layer where data has been recorded is distinguished from the recording area of the L1 layer corresponding to the L0 layer where data has not been recorded. That is, data is recorded in the recording areas from “Ad0” to “Ad4”, from “Ad3” to “Ad5”, from “Ad2” to “Ad6”, and from “Ad1” to “Ad7”. Corresponds to the L0 layer. On the other hand, recording areas with physical addresses “Ad4” to “Ad3”, “Ad5” to “Ad2”, and “Ad6” to “Ad1” correspond to the L0 layer where data is not recorded.

  In order to calculate the physical address of such a boundary, for example, 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 decentered from each other. It is in a positional relationship in which it is translated by an amount α (or further rotationally moved). Therefore, the physical address of the boundary can be calculated by mathematical calculation on the coordinate axes.

  Alternatively, the physical address of each point on the L1 layer corresponding to each point on the Nth track of the L0 layer may be directly calculated. Specifically, for example, 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 opened (that is, an interlayer jump), and the focus The address of a predetermined point on the L1 layer that has been input becomes the physical address of the boundary shown in FIG.

  Note that various management data included in the file system of the optical disc 100 or the like may be used to identify the recording area of the L0 layer in which data is recorded. Alternatively, as described above, if data representing the recording area of the L0 layer in which 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 address information that indicates the recording area of the L1 layer corresponding to the recorded L0 layer is included in the scope of the present invention. If the address information indicating the recording area of the L1 layer corresponding to the recorded L0 layer can be calculated, the recording area of the L1 layer corresponding to the unrecorded L0 layer is indirectly indicated. Address information can also be calculated. Further, the present invention is not limited to address information, and various types of information indicating the recording area of the L1 layer corresponding to the recorded L0 layer may be obtained.

  In FIG. 3 again, data recording to the L1 layer is started. At this time, under the control of the CPU 560, it is determined whether or not the data is recorded in the recording area of the L1 layer corresponding to the L0 layer where the data has been recorded (step S105). Here, the determination is made based on the address information calculated in step S104.

  As a result of this determination, if it is determined that the data is to be recorded in the recording area of the L1 layer corresponding to the recorded L0 layer (step S105: Yes), a driver / Under the control of the strategy circuit 504, data is recorded with a predetermined recording laser power P1 (step S106).

  On the other hand, when it is determined that data is recorded in the recording area of the L1 layer corresponding to the unrecorded L0 layer (step S105: No), a predetermined recording laser power P2 is controlled under the control of the driver / strategy circuit 504. Record the data at.

  Here, the recording laser powers P1 and P2 may be recording laser powers obtained by OPC performed on the OPC area of the L1 layer. In this case, after obtaining one of P1 and P2, the other recording laser power may be obtained by multiplying by a predetermined ratio or the like. Alternatively, a predetermined recording laser power determined in advance may be used. Information indicating the predetermined predetermined recording laser power, the above-described ratio, and the like may be recorded on the optical disc 100, or may be recorded on a memory or the like of the information recording apparatus 1. May be. Further, the recording laser powers P1 and P2 may have different output powers of the laser beam LB, or may have different strategies for defining the waveform of the laser beam LB. That is, the laser beam LB may be adjusted to switch the output power by the operation of the driver / strategy circuit 504, or the laser beam LB may be adjusted to switch the pulse waveform. Good.

  Further, when ROPC (Running OPC) is performed, the level of the reflected light amount that is the basis of correction of the recording laser power may be changed. That is, the level of the reflected light amount monitored by the recording power monitor 580 and referred to when correcting the recording laser power may be changed.

  Here, the recording laser power switching operation will be described with reference to FIG. FIG. 6 is a graph conceptually showing the relationship between the recording laser power and the physical address of the L1 layer in the recording laser power switching operation of the information recording apparatus in the example.

  As shown in FIG. 6, the recording laser power is switched according to the obtained address information. For example, when data is recorded on the L1 layer of the optical disk shown in FIG. 5, recording is performed with the recording laser power P1 when the physical address is recorded in the recording area from “Ad0” to “Ad4” according to the obtained address information. To do. Then, after the physical address of the recording area to be recorded exceeds “Ad4”, the recording operation is switched to the recording laser power P2, and the recording operation is continued up to the recording area of the physical address “Ad3”. Then, after the physical address of the recording area to be recorded exceeds “Ad5”, the recording operation is switched again to the recording laser power P1, and the recording operation is continued until the recording area having the physical address “Ad2”. Thereafter, this operation is repeated, and data is recorded in the L1 layer.

  Note that if a certain amount of time is required for switching between the recording laser power P1 and the recording laser power P2, the recording laser power switching process is performed earlier than the normal switching timing by that time. Also good. For example, if 100 μs is required for switching the recording laser power, the switching process is performed in advance 100 μs before reaching the boundary for switching (or the laser beam LB is irradiated to the boundary for switching). May be. 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 for 100 μs. The recording laser power switching process may be performed 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 advanced by 100 μs.

  With this configuration, it is possible to perform a recording laser power switching operation while appropriately associating with a recording region that is actually irradiated with laser light, thereby realizing a more preferable recording operation.

  In FIG. 3 again, under the control of the CPU 560, it is determined whether or not to end the data recording operation on the L1 layer (step S108).

  As a result of this determination, if it is determined to end the data recording operation on the L1 layer (step S108: Yes), it is subsequently determined whether or not to end the recording operation (step S109). On the other hand, if it is determined not to end the data recording operation on the L1 layer (step S108: No), the recording operation is continued while appropriately switching the recording laser power according to the recording area to be recorded.

  As described above, according to the information recording apparatus 1 according to the present embodiment, when data is recorded on the L1 layer, the recording laser power can be appropriately switched according to the recording state of the L0 layer. Therefore, data can be appropriately recorded in the L1 layer regardless of whether data is recorded in the L0 layer or not. For this reason, it is possible to improve the recording quality of the data recorded on the L1 layer, and as a result, it is possible to improve the reproduction quality when reproducing the recorded data.

  In this embodiment, the recording laser power is switched in consideration of the eccentricity that may occur in the two-layer type optical disc 100. In the DVD as a specific example of the optical disc 100, the maximum allowable amount is determined as 70 μm in the standard. On the other hand, the width of one recording track in the radial direction is approximately 0.7 to 0.74 μm. From the viewpoint of appropriately recording data in the L1 layer in consideration of the state of the L0 layer, this eccentricity is performed. The existence of can never be ignored. For this reason, in this embodiment, since the recording laser power can be switched with sufficient consideration of eccentricity, data can be recorded more suitably, and recording quality can be further improved. It has the great advantage of being able to.

  Furthermore, in this embodiment, based on the eccentricity α of the optical disc, the recording area of the L1 layer corresponding to the L0 layer where data has been recorded and the recording area of the L1 layer corresponding to the L0 layer where data has not been recorded are previously stored. Can be identified. 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.

  In the present embodiment, the operation of switching the recording laser power when recording data in the corresponding L1 layer according to whether or not data is recorded in the recording area of the L0 layer has been described. Similarly, it can be configured that the recording laser power for recording data in the corresponding L0 layer may be switched depending on whether or not data is recorded in the recording area of the L1 layer. Nor.

  Further, in the above-described embodiments, the optical disc 100 as an example of the information recording medium and the recorder related to the optical disc 100 as an example of the information recording apparatus have been described. However, the present invention is not limited to the optical disc and the recorder. The present invention can also be applied to various information recording media compatible with high-density recording or high transfer rates and recorders thereof.

  The present invention is not limited to the above-described embodiments, and can be appropriately changed without departing from the gist or concept of the invention that can be read from the claims and the entire specification, and information recording accompanying such changes is possible. The apparatus and method, and the computer program for controlling information recording are also included in the technical scope of the present invention.

The information recording medium, the information recording apparatus and method, the information distribution apparatus and method, and the computer program according to the present invention are applicable to an information recording medium such as a DVD and an information recording apparatus and method such as a DVD recorder, for example. Further, for example, the present invention can be used for an information recording apparatus or the like that is mounted on or can be connected to various computer equipment for consumer use or business use.

Claims (8)

A recording means for recording the recording information on an information recording medium comprising a first recording layer and a second recording layer for recording information by irradiating an adjustable laser beam;
A position indicating 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 been recorded, based on the amount of eccentricity between the first recording layer and the second recording layer A calculation means for calculating information;
An information recording apparatus comprising: control means for controlling the recording means so as to adjust the laser beam based on the position information when the recording information is recorded on the second recording layer.   The information recording apparatus according to claim 1, wherein the calculation unit further includes a detection unit that detects the amount of eccentricity.   2. The information recording apparatus according to claim 1, wherein the calculating means further comprises storage means for storing a position of a recording area of the first recording layer in which the recording information has been recorded.   The control means is a first laser beam for recording the recording information in a recording area of the second recording layer corresponding to the recorded first recording layer based on the position information. The laser light according to the second setting and the laser light according to the second setting, which is the laser light for recording the recording information on the second recording layer corresponding to the first recording layer where the information is not recorded, are mutually connected. The information recording apparatus according to claim 1, wherein the recording unit is controlled so as to adjust the laser beam by switching to the above.   The control means uses the laser light according to the first setting and the second light on the basis of the time when the information recording medium is irradiated with one of the first and second laser lights after switching. 5. The information recording apparatus according to claim 4, wherein the recording means is controlled so as to be switched in advance quickly for a time required for mutual switching with the laser beam related to the setting.   The said control means controls the said recording means to adjust at least one of the strategy for controlling the output power of the said laser beam, and the waveform of the said laser beam, The Claim 1 characterized by the above-mentioned. Information recording device. An information recording method for an information recording apparatus comprising a recording means for recording the recording information on an information recording medium comprising a first recording layer and a second recording layer for recording information by irradiating an adjustable laser beam. And
A position indicating 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 been recorded, based on the amount of eccentricity between the first recording layer and the second recording layer A calculation step for calculating information;
And a control step of controlling the recording means so as to adjust the laser beam based on the position information when recording the recording information on the second recording layer. A computer program for eccentricity detection control for controlling a computer provided in the information recording apparatus according to claim 1, wherein the computer is at least a part of the recording means, the calculating means, and the control means. A computer program that functions as a computer program.

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