JP4462182B2 - Optical disc apparatus and optimum recording power value determination method for optical disc - Google Patents

Description

  The present invention relates to an optical disc apparatus and an optimum recording power value determination method for an optical disc, and particularly when recording information on an optical disc having a multilayer structure by laser light, an optimum recording power value is obtained for the data area of each layer. The present invention relates to an optical disc apparatus for recording information with an optimum recording power value, and an optical disc optimum recording power value determination method for obtaining an optimum recording laser power when information is recorded on an optical disc having the multilayer structure described above.

  Currently, in the field of optical discs, various types of optical discs capable of recording information are increasing, and many types of digital versatile optical discs (DVDs) are commercially available (for example, DVDs). -Write-once optical discs such as -R and rewritable optical discs such as DVD-RW and DVD-RAM). There are also optical discs having different recording layer structures. For example, an optical disc that has been a single recording layer until now has become a multi-layered recording layer from an optical disc having a single-sided dual-layer structure having two recording layers capable of optically recording and reproducing information signals from one side. The structure of the optical disk is becoming more complicated.

  However, if the recording layer has a multilayer structure, the recording capacity can be expected to increase more than before, which is very useful in an optical disc that aims to increase the capacity. In such an optical disc in which a recording layer including a single-sided dual-layer optical disc has been multilayered, various recording settings that have been performed on a single-layer optical disc can be made in the case of performing additional recording or rewriting regarding information recording. It must be done even with an optical disc with One of the settings is to set an optimum recording power value of a laser output for recording information.

  The reason why the laser output at the time of recording on the optical disk having a multilayer structure is set to the optimum recording power value is the same as in the case of the single-layer optical disk, and the optimum recording power control (OPC: laser) for irradiating the information when recording information. If Optimum Power Control is not performed, when information recorded on an optical disk is recorded, jitter will increase and accurate information may not be reproduced. is there.

  Therefore, when reproducing recorded information, the laser beam must be controlled to the optimum recording power in accordance with the characteristics of the data area in which the information is written in order to perform accurate reproduction while suppressing the jitter as much as possible. Controlling the light emission power (recording power) of recording is one of the very effective methods for suppressing the reproduction jitter, so that the optimum recording power value is controlled.

  However, an optical disc having a multilayer structure has different characteristics before recording information as compared to an optical disc having a single layer structure, and the recording state of each layer affects the recording power of other layers. In the method for obtaining, it is necessary to use a method different from the method for obtaining the optimum recording power value of the conventional optical disk having a single layer structure.

  Therefore, in order to record, reproduce or erase each recording layer of a multi-layer recording medium having a plurality of recording layers with a light beam having an appropriate power, a trial writing operation is performed for each information track at each radial position, and the reproduction is performed. 2. Description of the Related Art Conventionally, an optical disc apparatus has been proposed in which a signal condition is inspected to obtain an optimum light beam condition for information recording, erasing or reproducing operation for each information track (see, for example, Patent Documents 1 and 2).

  In Patent Document 1, the recording power is sequentially changed in a stepwise manner for each of a plurality of test writing areas on a reference layer (for example, a recording layer closest to or farthest from an optical head) of a multilayer recording medium. After the minimum mark is continuously written with the light beam, the recording power when the reproduction signal amplitude becomes maximum is reproduced and stored in the memory as the optimum recording power. After that, in the recording layer other than the reference layer, the optimum recording power is obtained in the same manner as the reference layer, with the area at the same radial position as one of the test writing areas of the plurality of test writing areas of the reference layer being the test writing area. After obtaining the optimum recording power and the optimum recording power in the trial writing area of the reference layer at the same radial position as the trial writing area, the sensitivity coefficient is obtained, and the optimum recording power of the area at each radial position is obtained using the sensitivity coefficient. Describes an optical disk apparatus configured to perform the above-described calculation for all recording layers other than the reference layer.

  In Patent Document 2, a data area for recording information in each recording layer is different from a test writing area used for determining the optimum recording power value of the laser beam emission power when recording information. There is described an optical disc apparatus that is provided at a position and performs trial writing of recording power in a trial writing area in the same layer as a data area for recording information to obtain an optimum recording power value. In Patent Document 2, a data area and a trial writing area are provided only in one layer of a recording surface having a multilayer structure, and only a data area is provided in the other layer. And the test recording area of the layer having two areas, the test writing area, and the optimum recording power value of the layer having only the data area based on the optimum recording power value. An optical disk device for obtaining the above is also described.

Japanese Patent Laid-Open No. 11-3550 (summary, FIG. 3) Japanese Unexamined Patent Publication No. 2000-31346 (Claims 1, 5, 4, 8, etc.)

  Here, the main characteristics of an optical disc having a multilayer structure will be described. In the optical disc having a multilayer structure, the recording layer may overlap several layers, and the higher recording layer (recording closer to the objective lens) The reflectance of the layer) is kept low. Further, since the laser beam reaches the lower recording layer, the transmittance of the upper recording layer is set high.

  When an information signal is recorded on the recording layer, the refractive index of the recording layer changes, and the recording film shape changes due to heat absorption of the recording layer. It affects the recording power of the recording layer.

  However, in the conventional optical disc apparatus described in Patent Document 1, since the test writing area at the same radial position is used for the reference layer and the other recording layers, the recording layer closer to the objective lens (the upper recording layer) Depending on the recording state of the layer) (recorded or unrecorded, recording power in the case of recording), the transmittance of the other layer varies, so the optimum recording power of the layer to be recorded changes. is there.

  In the conventional optical disc apparatus described in Patent Document 2, trial writing (OPC: Optimum Power Control) is performed every time recording is performed for each layer, but the trial writing takes time, but trial writing (OPC). Since only one recording layer is used and all other recording layers omit test writing (OPC) as a data area, there is a high possibility that an error will occur in the optimum recording power in the other recording layers. There is a problem.

  The present invention has been made in view of the above points. When information is recorded on an optical disk having a multilayer structure that can be additionally written or rewritten, the trial writing area (OPC area) can be saved and the number of times that additional writing can be performed is increased. Another object of the present invention is to provide an optical disc apparatus and a method for determining the optimum recording power value of an optical disc that can shorten the time required for trial writing.

In order to achieve the above object, the optical disc apparatus of the present invention has a plurality of recording layers capable of optically recording and reproducing information signals from one side, which are laminated in the direction of laser beam irradiation from the optical head. For a multi-layer optical disc in which each recording layer is provided with a data area for recording an information signal and a test writing area used to determine the optimum recording power value of the laser beam emission power when the information signal is recorded. An optical disc apparatus that records an information signal with the determined optimum recording power value and reproduces the recorded information signal. When the information signal is recorded on the optical disc for the first time, a plurality of recording layers are stacked. In order to prevent the test signals to be written on each of the plurality of recording layers in the direction from overlapping each other, the test signals are sequentially recorded and reproduced on each of the test writing areas of the plurality of recording layers. Seeking first optimum recording power value of the emission power of the laser beam for each recording layer, is stored in a recording management information area of the optical disc, when recording the second and subsequent information signals on the optical disk, among the plurality of recording layers Then, a test signal is recorded / reproduced with respect to the test writing area of the first recording layer of the optical disc, the optimum recording power value for the second and subsequent times of the first layer is obtained, and other recording layers other than the first layer The second and subsequent optimum recording power values are the first and second optimum recording power values of the first layer, and the first optimum recording power values of the other recording layers with respect to the first optimum recording power value of the first layer. Control means for multiplying by a ratio of values is obtained.

In the optical disc optimum recording power value determining method of the present invention, a plurality of recording layers capable of optically recording and reproducing information signals from one side are laminated in the direction of laser beam irradiation from the optical head. For a multi-layer optical disc in which each recording layer is provided with a data area for recording an information signal and a test writing area used to determine the optimum recording power value of the laser beam emission power when the information signal is recorded. An optical disc optimum recording power value determining method for determining an optimum recording power value of the laser beam emission power, wherein a first determination is made as to whether an information signal is recorded on the optical disc for the first time or after the second time. And when the information signal is recorded on the optical disc for the first time, a test signal is written for each test writing of the plurality of recording layers in the stacking direction of the plurality of recording layers. As but not to overlap each sequentially test signal recorded and reproduced, it obtains a first optimum recording power value of the emission power of the laser beam for each recording layer for each trial writing area of the plurality of recording layers, the optical disk In the second step of storing in the recording management information area and when the information signal is recorded on the optical disk for the second time or later, among the plurality of recording layers, the test writing area of the first recording layer of the optical disk Then, the test signal is recorded and reproduced to obtain the optimum recording power value for the second and subsequent times of the first layer, and the optimum recording power value for the second and subsequent times of the other recording layers other than the first layer is obtained from the first layer. And the third step of multiplying the second optimum recording power value by the ratio of the first optimum recording power value of the first layer to the first optimum recording power value of the other recording layer. It is characterized by that.

  According to the present invention, recording / reproduction of a test signal for obtaining an optimum recording power value using a test writing area of a recording layer other than the first layer closest to the optical head among the plurality of stacked recording layers ( The OPC is performed only when recording is performed for the first time by the optical disc apparatus, so that the number of test signal recording / reproducing times of the recording layers other than the first layer is reduced. The area can be secured wider than the trial writing area of the other recording layer, and the number of times (OPC number) for obtaining the optimum recording power value can be greatly increased.

  Further, according to the present invention, trial writing is performed only in the trial writing area of the first recording layer from the second and subsequent recordings, and the optimum power value of the recording layers other than the first layer is the first layer. Since it is determined based on the optimum recording power value of the first recording layer by trial writing to the trial writing area of the recording layer, switching for performing trial writing in other layers other than the first layer is performed. Time and time required for OPC in other layers are not required, and the time required to obtain the optimum recording power value can be shortened.

  In order to achieve the above object, the optical disc apparatus of the present invention has a plurality of recording layers capable of optically recording and reproducing information signals from one side, which are laminated in the direction of laser beam irradiation from the optical head, Each of the plurality of recording layers is provided with a data area for recording an information signal and a test writing area used for determining the optimum recording power value of the laser beam emission power at the time of recording the information signal at different positions. In an optical disk apparatus that records information signals with the determined optimum recording power value and reproduces the recorded information signals on a multilayered optical disk, the information signal is recorded on the optical disk for the first time. Test signals are sequentially recorded and reproduced for each test writing area of the recording layer, and the first optimum recording power value of the laser beam emission power is obtained for each recording layer. The first optimum recording power value determining means for storing them, and when the information signal is recorded on the optical disk for the second time or later, of the plurality of recording layers, the first recording layer closest to the optical head A test signal is recorded / reproduced in / from the test writing area to obtain a second optimum recording power value of the laser beam emission power for the first recording layer, and a plurality of recording layers other than the first layer are obtained. The third optimum recording power value of the laser beam for the other recording layers is the second optimum recording power value, and the first optimum recording power of the recording layer for obtaining the recording power value and the first recording layer And a second optimum recording power value determining means for multiplying by a ratio of the values, and determining an optimum recording power value of the laser beam emission power for each of the plurality of recording layers.

  In the present invention, when the information signal is recorded on the optical disc for the second time or later, the test signal is recorded / reproduced with respect to the test writing area of the first recording layer closest to the optical head among the plurality of recording layers. The second optimum recording power value of the laser beam emission power for the first recording layer is obtained, and the optimum recording power value of the recording layers other than the first layer is the second optimum recording power value. Since the optimum recording power value obtained at the time of the initial recording is obtained by calculation, test signal recording / reproduction (OPC of OPC) for obtaining the optimum recording power value using the test writing area of the recording layer other than the first layer is performed. (Execution) is performed only when recording is performed for the first time in the optical disc apparatus, and therefore the number of test signal recording / reproducing times of recording layers other than the first layer can be reduced.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

(First embodiment)
FIG. 1 is a block diagram showing an embodiment of an optical disk apparatus according to the present invention. This optical disk apparatus has an optical head 2, a laser drive circuit 3, a servo circuit 4, an OPC recording processing unit 5, an encoding circuit 6, a reproduction signal processing unit 7, an OPC reproduction processing unit 8, and a system control circuit 9. In addition, by controlling each block by the system control circuit 9 realized by a microcomputer, for example, information is recorded with an optimum recording power value on the write once or rewritable optical disc 1 having a single-sided two-layer structure. A process for reproducing the recorded information is performed.

  That is, the optical disk apparatus shown in FIG. 1 irradiates a laser beam from the optical head 2 to the optical disk 1, thereby receiving reflected light reflected from the optical disk 1 by the optical head 2 and converting it into a signal obtained by photoelectric conversion. Based on this, the servo circuit 4 performs tracking control, focus control, and movement control of the laser beam irradiated from the optical head 2 to the optical disc 1, reads the signal of the optical disc 1 by the light receiving element in the optical head 2, and outputs the read signal. The reproduction signal processing unit 7 performs predetermined signal processing and then supplies the signal to the OPC reproduction processing unit 8.

  On the other hand, for information recording, in order to obtain the optimum recording power of the laser beam at the time of recording with respect to the trial writing information, the trial writing information from the system control circuit 9 is supplied to the laser driving circuit 3 by the OPC recording processing unit 5. Then, the laser diode in the optical head 2 is driven and controlled, and the test writing is performed by changing the laser power (recording power) at the time of recording step by step. At that time, the system control circuit 9 determines the optimum recording power value of each layer.

  Then, based on the reflected light from the optical disc 1, the recording test writing information on which the trial writing has been performed is read by the light receiving element in the optical head 2, and the read signal is read by the reproduction signal processing unit 7 to obtain a predetermined signal. After the processing is performed, the OPC reproduction processing unit 8 detects the optimum recording power value.

  After the optimum recording power value is obtained, the recording data 10 is encoded by the encoding circuit 6. The encoded data output from the encoding circuit 6 is supplied to the laser drive circuit 3 via the OPC recording processing unit 5 to generate a drive control signal. A drive control signal from the laser drive circuit 3 drives a laser diode in the optical head 2 to emit a laser beam having a power based on the optimum recording power value, and records encoded data on the optical disc 1.

  Next, the optical disc 1 having a single-sided dual layer recording layer used in the optical disc apparatus will be described. FIG. 2 shows a cross-sectional view of an example of an optical disc 1 having a single-sided dual-layer recording layer. FIG. 3 shows a top view of an example of the optical disk 1 having a single-sided two-layer structure shown in FIG. FIG. 4 is an explanatory diagram showing an example of a configuration of a test writing area (hereinafter referred to as an OPC area) of the optical disc 1 having a single-sided, double-layered recording layer in the first embodiment.

  As shown in FIG. 2, the optical disc 1 has a single-sided two-layer structure in which a recording layer for recording information has a first layer 20 and a second layer 21 laminated. The distance between each recording layer of the first layer 20 closer to the optical head 2 and the second layer 21 farther from the optical head 2 is about 40 to 60 μm, and from the surface of the optical disc 1 to the first layer 20. The distance to the intermediate point with the second layer 21 is about 0.57 mm. The first layer 20 is a translucent recording layer. Each layer 20, 21 has a land and a groove, and data is written by various recording methods.

  Further, as shown in FIG. 3, on the upper surface of the single-sided, dual-layer optical disc 1 according to the first embodiment, a data area 11 into which data is written and a management provided on the inner peripheral side of the data area 11 Region 12 is provided. The management area 12 includes an OPC area 12a for trial writing, a recording management information (RMA) area 12b for recording recording management information such as a medium type, a recording method, and the number of recordings, and a CPRM ( It consists of a BCA (Burst Cutting Area) area 12c for dealing with Content Protection for Prerecorded Media. The OPC area 12a on which trial writing is performed may be referred to as a PCA (Power Calibration Area) area or a DTA (Disc Testing Area) area depending on the recording medium and the layer structure. In this specification, these are referred to as an OPC area. It shall be named generically.

  In the first embodiment, the first recording layer (hereinafter simply referred to as the first layer) 20 and the second recording layer (hereinafter simply referred to as the second layer) of the optical disc 1 having a single-sided two-layer structure. In both recording layers 21), as shown in FIG. 4, an OPC area T 1 (first layer 20) and an OPC area T 2 used to determine the light emission power (recording power) of the laser beam when information is recorded. The (second layer 21) is provided at different positions so as not to overlap in the stacking direction. The RMA area 12b is located on the outer circumference side of the OPC areas T1 and T2, the BCA area 12c is located on the outer circumference side of the RMA area 12b, and the data area 11 is located on the outer circumference side of the BCA area 12c.

  The OPC area T1 of the first layer 20 shown in FIG. 4 has, for example, a radial width of the optical disk 1 of about 50 μm and a capacity of about 1600 sectors, and the OPC area T2 of the second layer 21 is also in the radial direction of the optical disk 1. The width is about 50 μm and the capacity is about 1600 sectors. However, the widths of the respective OPC areas T1 and T2 are only determined as the maximum value of the total of the widths. In the present invention, the widths of the OPC areas T1 and T2 are determined within the range of the maximum values. Can do. In the trial writing, about 27 sectors are recorded per track, but because of CLV (Constant Linear Velocity) recording, the number of sectors per track changes.

  Further, as described above, the OPC region T1 of the first layer 20 and the OPC region T2 of the second layer 21 are arranged so as not to overlap in the stacking direction, but the first layer 20 and the second layer are arranged. Considering the eccentricity of the eye 21 and the laser beam diameter in the upper layer, a margin C is provided at the boundary between the OPC region of the first layer 20 and the second layer 21 as shown in FIG. C is the width in the radial direction and is about 100 μm.

  Next, an embodiment of an optical disk optimum recording laser power value determination method according to the present invention will be described.

  FIG. 5 shows a flowchart of an embodiment of an optimum recording laser power value determination method according to the present invention. The optimum recording laser power value determination method of this embodiment is a method for determining the optimum value of the recording laser power when information is recorded on the optical disk 1 having a single-sided two-layer structure, which will be described later, by the optical disk apparatus shown in FIG. is there.

  First, in the optical disk apparatus shown in FIG. 1, when the optical head 2 is moved onto the management area 12 of the optical disk 1 by the servo circuit 4, information indicating the number of times of recording is read from the RMA area 12b of the management area 12 and reproduction signal processing is performed. Part 7 reproduces the information. Information indicating the number of times of reproduction is input to the system control circuit 9 via the OPC reproduction processing unit 8. Here, of course, the information indicating the number of times of reproduction may be input directly from the reproduction signal processing unit 7 to the system control circuit 9 without going through the OPC reproduction processing unit 8.

  Based on the information indicating the number of times of recording reproduced from the RMA area 12b, the system control circuit 9 first determines whether or not recording is performed for the first time with the same optical disk combination (first recording) in the same optical disk device (step S1). ). If it is determined that the recording is the first (first) recording, the system control circuit 9 firstly makes a publicly known information about the first layer 20 that is the recording layer closest to the optical head 2 of the optical disk 1 having a single-sided, two-layer structure. OPC is executed by the method, the optimum recording power PL1 of the first layer is obtained, and the optimum recording power value PL1 is obtained as the first optimum recording power value in the optical disc apparatus such as the memory 91 in the system control circuit 9, for example. Stored as ML1 (step S2).

  Here, in the OPC area T1 of the first layer 20, a test signal having a predetermined pattern is continuously written with a light beam whose recording power is changed stepwise and then reproduced, and jitter of the reproduced signal is reproduced. The recording power with the lowest is the optimum recording power PL1. There is a relationship as shown in FIG. 6 between the recording power and the jitter of the reproduction signal, for example, and the asymmetry value β of the reproduction signal when recording with the optimum recording power substantially coincides with the target value. For example, as shown in FIG. 7, β is the sum of the peak value A1 (positive number) and the bottom value A2 (negative number) of the reproduction test signal [difference between absolute values of the peak value A1 and the bottom value A2]. This is an asymmetry value divided by the difference between the peak value A1 and the bottom value A2 (peak-to-peak value) [sum of absolute values of the peak value A1 and the bottom value A2].

  Since the target value of the asymmetry value β differs depending on the optical head 2 and the optical disk 1 that are actually used, the target value is determined in advance by an experimental result individually in the manufacturing process, and the target value is a system control in the optical disk apparatus. The system control circuit 9 stores in the memory 91 the recording power at which the asymmetry value β obtained when substantially matching the target value is stored in the memory in the circuit 9 as the optimum recording power.

  Subsequently, the system control circuit 9 moves the objective lens in the optical head 2 by a predetermined distance in the direction of the optical disk 1 via the servo circuit 4 and reaches the top position of the OPC area T2 of the second layer 21 of the optical disk 1. The optical head 2 is moved to execute the above OPC on the second layer 21 to obtain the optimum recording power PL2 of the second layer, and the value ML2 of the optimum recording power is stored in the memory 91 or the like ( Step S3). When the ratio ML2 / ML1 of the optimum recording power value on the second layer 21 with respect to the first layer 20 for the first time is obtained, the optimum recording power PL2 for the second and subsequent data writing of the second layer 21 is obtained. Of course, the ratio ML2 / ML1 of the first optimum recording power value may be obtained in advance and stored in the memory 91.

  It should be noted that the region of the first layer 20 that overlaps the OPC region T2 of the second layer 21 in the laser beam irradiation direction (stacking direction) includes the margin C and is shipped from the factory or during the first recording. Dummy data is recorded. As a result, at the time of recording in the OPC area T2 of the second layer 21, the laser beam is always applied to the OPC area T2 of the second layer 21 through the recorded area of the first layer 20, and the test signal is transmitted. Will be recorded. Thereby, the test signal can be recorded with the same recording conditions for the first layer 20 and the second layer 21.

  Next, the system control circuit 9 moves the optical head 2 to the head position of the data area 11 of the first layer 20 of the optical disc 1 via the servo circuit 4 and also lasers the first layer 20 of the data area 11. The recording of data is started with the optimum recording power PL1 with the beam focused. When the recording of data on the first layer 20 is completed, the objective lens in the optical head 2 is moved in a direction approaching the optical disc 1 by a predetermined distance, and the focal point of the laser beam is focused on the data area 11 of the second layer 21. The data is recorded in the data area 11 of the second layer 21 with the optimum recording power PL2 so as to match (step S6).

  By the way, when the system control circuit 9 determines in step S1 of FIG. 5 that the recording is performed for the second time or later on the same optical disc 1 by the same optical disc apparatus, first, the first layer 20 of the optical disc 1 is used. The OPC is executed in the OPC area T1, and the optimum recording power PL1 of the first layer is obtained and stored in the memory 91 or the like (step S4). Subsequently, the system control circuit 9 obtains the optimum recording power PL2 of the second layer at steps S2 and S3 at the first (first) OPC, and obtains the values of ML1 and ML2 stored in the memory 91 or at step S3. The ratio ML2 / ML1 stored in the memory 91 or the like is obtained by multiplying the optimum recording power PL1 of the first layer 20 after the second time obtained in step S4 (step S5).

That is, the system control circuit 9 sets the optimum recording power PL2 of the second layer 21 after the second time to the following equation (1), that is,
PL2 = PL1 × ML2 / ML1 (1)
Obtained by calculating However, PL1 in the above equation (1) is the optimum recording power of the first layer 20 after the second time obtained in step S4.

  Thereafter, the system control circuit 9 records data in the data area 11 of the first layer 20 of the optical disc 1 with the optimum recording power PL1 obtained in step S4, and the data area 11 of the first layer 20 is recorded. After the data recording is completed, data is recorded with the optimum recording power PL2 obtained in step S5 in the data area 11 of the second layer 21 (step S6).

  As described above, in the present embodiment, when recording is performed for the second and subsequent times in the combination of the same optical disk device and the same optical disk, the optimum recording power PL1 of the first layer 20 is obtained by executing OPC, As for the optimum recording power PL2 of the second layer 21, the optimum recording power ML1 of the first layer 20 obtained at the first OPC and the optimum recording power PL1 of the first layer 20 obtained by the second and subsequent OPCs and the second Since the ratio ML2 / ML1 between the optimum recording power ML2 of the layer 21 is multiplied and obtained, the optimum recording power PL2 of the second layer 21 after the second time can be obtained without executing OPC. As for the second layer 21, the start-up time can be shortened, that is, the time required for OPC can be saved and recording can be started as soon as possible. It can reduce the OPC execution number of times of the eye 21.

  Further, in the present embodiment, the OPC of the second layer 21 is performed only when recording is performed for the first time in each optical disk device. Therefore, particularly when the optical disk 1 is a write-once type, By reducing the number of OPC executions, the number of times that OPC can be performed can be increased. That is, for the second layer 21, the OPC is executed only for the first time, and the OPC is not executed for the second and subsequent times, and the optimum recording power ratio ML2 of the second layer 21 with respect to the first layer 20 for the first time. Since the OPC area T2 of the second layer 21 has a small width and can be saved, the OPC area T1 of the first layer 20 is relatively reduced. , Wide width can be secured. As a result, the number of OPCs can be increased after the second time as compared with the prior art in which OPC is performed on the second layer 21.

(Second Embodiment)
In the first embodiment, as shown in FIGS. 3 and 4, the OPC for the optical disk 1 provided with the BCA area 12c for supporting CPRM has been described. However, in the second embodiment, the CPRM non-CPRM is not used. Since a compatible optical disk is used, there is no need to provide the BCA area 12c, and the area used as the BCA area 12c is further used as an OPC area in the second and subsequent layers, thereby further increasing the number of OPCs. This is an embodiment. Note that the configuration of the optical disk device and the procedure of the recording process are the same as those in the first embodiment shown in FIGS. 1 and 5, and therefore the OPC process for the optical disk 1 specific to the second embodiment is performed. The execution part will be described.

  FIGS. 8A and 8B are explanatory views showing an example of the arrangement of the OPC area of the optical disc 1 in which the recording layer has a single-sided two-layer structure in the present embodiment. As shown in FIGS. 8A and 8B, the optical disc 1 according to the second embodiment does not support CPRM, so that it is not necessary to provide a BCA area on the outer peripheral side of the RMA area. Therefore, the system control circuit 9 of the present embodiment uses that area as the OPC area.

  In the first embodiment, as shown in FIG. 4, the OPC area is arranged in each recording layer so that the OPC areas of each recording layer do not overlap. Considering the laser beam diameter in the upper layer, a margin C is given in the horizontal direction at the boundary of the OPC region of each layer. Accordingly, the OPC area of an optical disk having a multilayer structure tends to have a smaller capacity per layer than the OPC area of an optical disk having a single layer structure.

  Therefore, as shown in FIGS. 8A and 8B, the system control circuit 9 according to the present embodiment uses the outer periphery side of the RMA area, that is, the area used as the BCA area in the case of an optical disk compatible with CPRM, In the case of the first layer 20, it is used as an empty area V1, and in the case of the second layer 21, it is used as an OPC area T2. Therefore, in the case of the present embodiment, the region used as the OPC region T2 of the second layer 20 in FIG. 4 on the inner peripheral side from the RMA region is not used.

  In the optical disk shown in FIG. 8A, for example, the width of the OPC area T1 of the first layer 20 in the disk radial direction is about 50 μm, the capacity is about 1600 sectors, and the width of the OPC area T2 of the second layer 21 is. Is about 20 μm and has a capacity of 640 sectors. Also, in the empty area V1 of the first layer 20, dummy data may be recorded by the optical disc apparatus at the time of factory shipment or at the first recording, as in the first embodiment. Good.

  Further, by effectively utilizing the OPC region T1 of the first layer 20 and the OPC region T2 of the second layer 21 via the RMA region, in the present embodiment, FIG. As shown, the OPC region T1 of the first layer 20 can be widely secured on the inner peripheral side of the RMA region without considering the OPC region of the second layer 21 and the margin width therebetween. .

  Next, the characteristics of OPC by the optical disc apparatus of the second embodiment will be described. In the case of the present embodiment, the same processing as that of the optical disc apparatus of the first embodiment shown in FIG. 5 is performed, and in the case of the first writing, the OPC area T1 of the first layer 20 and the second layer Test writing is performed on each of the 21 OPC areas T2.

  At this time, if dummy data is recorded in the empty area V1 of the first layer 20 that overlaps the OPC area T2 of the second layer 21 in the laser beam irradiation direction (stacking direction), the OPC of the second layer 21 is recorded. During recording in the area T2, the laser beam from the optical head 2 is always applied to the OPC area T2 in the second layer 21 through the empty area V1 in which the dummy data has been recorded in the first layer 20, and test writing is performed. It is possible to record a test signal. As a result, the test conditions can be recorded in the OPC area T2 of the second layer 21 with the same recording conditions as when data is recorded in the data area 11 of the first layer 20, and the second signal can be recorded more accurately. The optimum recording power value of the layer 21 can be determined.

  Therefore, according to the present embodiment, the same effects as those of the first embodiment can be obtained, and in the present embodiment, the OPC region T1 of the first layer 20 and the OPC region T2 of the second layer Are provided on the inner peripheral side or the outer peripheral side with the RMA region as the center, so that the number of times that OPC can be performed can be further increased as compared with the case of the first embodiment.

  That is, in the present embodiment, as shown in FIGS. 8A and 8B, the region T2 outside the RMA region is used as the OPC region in the second layer 21, so that the second layer 21 If, for example, 640 sectors are used as the OPC area T2, the OPC area T2 of the second layer 21 is used only when recording is performed for the first time in each optical disk apparatus, so if 16 sectors are used for one OPC. For example, it is possible to execute OPC with 40 optical disk devices, which is actually a sufficient number of times.

  In addition, in the present embodiment, as shown in FIG. 8B, the area not used as the current OPC area of the second layer 21, the area C having a margin width therebetween, and the first embodiment A region (about 200 μm in width) obtained by adding up the OPC region T1 of the first layer 20 can be used as the OPC region T1 of the first layer 20. As a result, according to the present embodiment, 6400 sectors can be used in the OPC area T1 of the first layer 20, and if 16 sectors are used for one OPC, a total of 400 OPCs are executed. It becomes possible.

  In contrast to the method of the first embodiment, as shown in FIG. 4, in the first embodiment, the OPC region T2 of the second layer 21 is used exclusively for the OPC of the second layer, and the first Since the OPC area T1 of the layer 21 is used exclusively for the OPC of the first layer, if 16 sectors are used for each 1600 sectors for one OPC, the OPC is executed once by 100 optical disk devices. And the total number of OPCs is 100 times.

  On the other hand, according to the present embodiment, as described above, the OPC area T1 of the first layer 20 can execute 400 times of OPC in the first layer 20, so the OPC area of the second layer 21 can be executed. By securing the same width as the OPC area T1 of the first layer 20 as T2, it becomes possible to add four times (= 400/100) times as compared with the method of the first embodiment. .

  That is, according to the present embodiment, when one optical disk 1 is recorded by a plurality of optical disk devices, it becomes possible to execute OPC once by 400 optical disk devices, and a total of 400 times. OPC can be executed.

  In the present embodiment, when data is recorded in the data area 11 of the first layer 20 by, for example, pre-writing dummy data in the empty area V1 on the outer periphery side of the RMA area of the first layer 20 The recording conditions are the same and the test signal can be recorded in the OPC area T3 of the second layer. However, the present invention is not limited to this, and the RMA area of the first layer 20 is not limited thereto. Of course, dummy data may not be written in the empty area V1 on the outer periphery side of the area, and the area may be left as it is.

  In this case, it is not possible to record a test signal in the OPC area T2 of the second layer 21 with the same recording conditions as when data is recorded in the data area 11 of the first layer 20, but still, Since the width of the OPC region T1 of the first layer 20 can be secured wider than in the case of the first embodiment, an effect that the number of OPCs can be further increased is obtained.

  In the second embodiment, as shown in FIGS. 8A and 8B, the OPC region T1 of the first layer 20 is provided inside the RMA region, and the OPC region T2 of the second layer 21 is provided. However, the present invention is not limited to this, and as shown in FIG. 9, the OPC region T1 of the first layer 20 is provided outside the RMA region, and the second layer 21 is formed. Of course, the OPC region T2 may be provided inside the RMA region. This also applies to other embodiments described later.

(Third embodiment)
In the second embodiment, in the optical disc 1 that does not support CPRM, the outer peripheral side of the RMA area that is not used as the BCA area is used as the OPC area T2 of the second layer 21, and the RMA area of the second layer 21 is used. In the third embodiment, the inner peripheral side and the outer peripheral side of the RMA region of the first layer 20 are defined as the OPC region T1 of the first layer 21 in the third embodiment. Or the inner peripheral side and the outer peripheral side of the RMA region of the second layer 21 are used as the OPC region T2 of the second layer 21. The configuration of the optical disk apparatus according to the third embodiment and the recording processing procedure thereof are the same as those in the first and second embodiments shown in FIGS. 1 and 5, and therefore the third embodiment. Execution of the OPC process to the optical disc 1 peculiar to the embodiment will be described.

  FIGS. 10A and 10B are explanatory views showing an example of the arrangement of the OPC area of the optical disc 1 in which the recording layer has a single-sided two-layer structure in the third embodiment. FIG. 10A shows an example in which the inner peripheral side and the outer peripheral side of the RMA area of the first layer 20 of the optical disk 1 having a single-sided two-layer structure are used as the OPC area T1 of the first layer 20. As a result, the system control circuit 9 of the present embodiment can increase the number of OPCs to the first layer 20.

  FIG. 10B shows an example in which the inner peripheral side and the outer peripheral side of the RMA region of the second layer 21 of the optical disc 1 having a single-sided two-layer structure are used as the OPC region T2 of the second layer 21. As a result, the system control circuit 9 according to the present embodiment can increase the number of OPCs to the second layer 21.

  In addition, the system control circuit 9 of the present embodiment adaptively uses the inner and outer peripheral sides of the RMA area as the OPC area T1 of the first layer 20 or the OPC area T2 of the second layer 21. For example, if the inner peripheral side and the outer peripheral side of the RMA region of the first layer 20 of the optical disc 1 having a single-sided two-layer structure shown in FIG. 10A are used as the OPC region T1 of the first layer 20, In the first time, the OPC area T1 on the inner circumference side of the RMA area is preferentially used, and when the OPC area T1 on the inner circumference side of the RMA area becomes full, the OPC area T1 on the outer circumference side of the RMA area is used. On the contrary, the OPC area T1 on the outer peripheral side may be preferentially used.

  Further, the OPC is performed on the inner and outer OPC areas T1 of the RMA area of the first layer 20 and averaged, and the average value can be used as the first optimum recording power, or the second layer 21 can be averaged. For example, only one of the OPC area T2 on the inner circumference side or the outer circumference side is subjected to OPC via the dummy data described in the second embodiment so that the average value becomes the first optimum recording power. May be.

  Therefore, according to the present embodiment, the same effects as those of the first and second embodiments can be obtained, and the inner peripheral side of the RMA region as the OPC region of the first layer 20 and the second layer 21 can be obtained. In addition, since both the outer peripheral side and the outer peripheral side are used, an effect that the number of OPCs can be increased is obtained.

(Fourth embodiment)
This embodiment is an embodiment of an apparatus and method for determining an optimum recording laser power value for an optical disc having a structure having three recording layers on one side. The configuration of the optical disk apparatus according to the present embodiment is the same as that of the first, second, and third embodiments shown in FIG. 1, but the procedure of the recording process is that the optical disk 1 has a three-layer structure. Therefore, one layer is added to the recording processing procedure of the first embodiment shown in FIG. The same applies to the following fifth embodiment for the optical disc 1 having three recording layers on one side.

  FIG. 11 is an explanatory diagram showing an example of the arrangement of the OPC area of the optical disc 1 having a single-sided three-layer structure as the recording layer according to the fourth embodiment of the present invention. In the present embodiment, as in the first embodiment, a description will be given of a CPRM-compatible optical disk using the outer peripheral side of the RMA area 12b shown in FIG. 3 as the BCA area 12c.

  As shown in FIG. 11, the optical disc 1 of the present embodiment has a recording layer in the order of the first layer 30, the second layer 31, and the third layer 32 in order from the side closest to the optical head to the side farthest. Are stacked. The OPC region T1 of the first layer 30, the OPC region T2 of the second layer 31, and the OPC region T3 of the third layer 32 are respectively provided only on the inner peripheral side of the RMA region with a region C having a predetermined margin width. Provided.

  Next, the operation of the present embodiment will be described. Since the fourth embodiment is intended for an optical disc having a structure with three recording layers on one side, the system control circuit 9 in the optical disc apparatus has the first layer 30 in the first recording on the optical disc 1. OPC is sequentially performed on the OPC area T1, the OPC area T2 of the second layer 31, and the OPC area T3 of the third layer 32 to obtain optimum recording powers ML1, ML2, and ML3, and the values are stored in the memory. 91 or the like.

  When the optical disk 1 is recorded for the first time, the system control circuit 9 uses the optimum recording powers ML1, ML2, and ML3 to the data areas of the first layer 30, the second layer 31, and the third layer 32. Record data.

  Next, when performing the second and subsequent recordings on the same optical disk with the same optical disk apparatus, first, the system control circuit 9 in the optical disk apparatus executes OPC on the OPC area T1 of the first layer 30 of the optical disk. Then, the optimum recording power PL1 is obtained.

  Subsequently, the system control circuit 9 does not execute the OPC for the optimum recording power PL2 of the second layer 31 of the optical disc and the optimum recording power PL3 of the third layer 32, and each of them is the second first layer. Based on the optimum recording power value of the eye 30 and the ratio of the optimum recording power value of each layer to the optimum recording power of the first layer 30 obtained by the first OPC, the following equations (2) and (3) are calculated. And stored in the memory 91.

PL2 = PL1 × ML2 / ML1 (2)
PL3 = PL1 × ML3 / ML1 (3)
Thereafter, data is sequentially recorded in the data areas of the first layer 30, the second layer 31, and the third layer 32 with the optimum recording powers PL1, PL2, and PL3.

  Therefore, even in the fourth embodiment, even in the case of a single-sided three-layer optical disc, when the second and subsequent recordings are performed in combination with the same optical disc apparatus and the same optical disc, OPC is performed on the first layer 30. Is multiplied by the ratio ML2 / ML1, ML3 / ML1 of the optimum recording power value of each layer to the optimum recording power of the first layer 30 obtained at the first OPC. Since the optimum recording power PL2 of the second layer 31 and the optimum recording power PL3 of the third layer 32 are obtained by calculation without executing OPC, the single-sided two-layer structure of the first embodiment or the like. As in the case of the optical disc, the start-up time can be shortened, that is, the recording can be started as soon as possible by omitting the time required for OPC, and the optical disc 1 is of the write-once type. If it may be increased OPC capable count.

(Fifth embodiment)
Although the fourth embodiment has been described as a CPRM compatible optical disk using the outer periphery side of the RMA area as the BCA area, the fifth embodiment uses CPRM that does not use the outer periphery side of the RMA area as the BCA area. This is an embodiment of an apparatus and method for determining an optimum recording laser power value for an optical disc that is non-compliant and has a structure having three recording layers on one side.

  FIG. 12 is an explanatory diagram showing an example of the arrangement of the OPC area of the optical disk 1 having a single-sided three-layer structure as the recording layer in the fifth embodiment of the present invention. Since the present embodiment is a CPRM-compatible optical disc that uses the outer periphery of the RMA area as the BCA area, as in the second embodiment, as shown in FIG. The OPC area T1 is provided on the inner peripheral side of the RMA area, while the OPC areas T2 and T3 of the second layer 31 and the third layer 32 other than the first layer 30 are BCA areas if they are CPRM compatible. A region C having a predetermined margin width is provided in a region on the outer periphery side of the used RMA region.

  At this time, as described in the second embodiment, the OPC region T2 of the second layer 31 and the OPC region T3 of the third layer 32 are adjacent to each other in the laser beam irradiation direction (stacking direction). Dummy data is previously stored in the empty area V1 of the second layer 31 adjacent to the empty area V1 of the first layer 30 and the OPC area T3 of the third layer 32 in the laser beam irradiation direction (stacking direction). Of course, it is possible to record the dummy data on the optical disk device at the time of the first OPC execution so that the OPC can be executed under the same conditions as the actual data recording.

  Therefore, according to the fifth embodiment, similarly to the fourth embodiment, even in the case of a single-sided three-layer optical disc, the combination of the same optical disc device and the same optical disc can be used for the second and subsequent times. When recording, the start-up time can be shortened, that is, the recording can be started as soon as possible by omitting the time required for OPC, and the inner circumference side of the RMA area is used exclusively for the OPC area T1 of the first layer 30. As a result, the number of times that OPC can be performed can be further increased as compared with the case of the fourth embodiment.

  In the first to fifth embodiments described above, the optical disc 1 is described as a write-once type. However, the present invention is not limited to this, and the optical disc 1 is similarly applied to a rewritable type. When the optical disc is a rewritable type, it is possible to erase the trial-written data. Therefore, it is not always necessary to secure a wider range of the first layer trial writing area than the other layer trial writing areas. Since the erasure time and the number of erasures can be reduced, it is preferable to make the first layer test writing area wider than the other layer test writing areas as in the above embodiments.

  In the above embodiment, the description has been given of the single-sided, double-layered, and three-layered optical disc 1 as the optical disc having a plurality of recording layers. In addition, the present invention can also be applied to a double-sided dual-layer optical disc in which a single-sided dual-layer optical disc is bonded.

  In the above embodiment, when data recording to the same optical disc 1 is performed for the first time (first time) on the same optical disc apparatus, the system control circuit 9 executes OPC for each recording layer to perform optimum recording. Although it has been described that the power value is obtained and stored in the optical disc apparatus such as the memory 91 in the system control circuit 9, the present invention is not limited to this, and the optimum recording obtained by executing OPC for each recording layer. Of course, the power value may be recorded in the RMA area of the management area 12 of each recording layer of the optical disc 1, for example.

  In this way, the optical disk apparatus always reads the RMA area of the management area 12 of each recording layer. Therefore, when determining whether or not it is the first time (first time) for the same optical disk apparatus, The optimum recording power value of each recording layer is always read, and the optimum recording power value of each recording layer can be obtained easily and reliably. In particular, by recording the optimum recording power value obtained by executing the first OPC for each recording layer in the RMA area of the management area 12 of the first layer of the optical disc 1, the RMA area of the first layer is recorded. When reading, the first optimum recording power value of each recording layer can be detected at a time.

1 is a block diagram of an embodiment of an optical disk device of the present invention. It is sectional drawing of an example of the optical disk with a single-sided recording layer having a two-layer structure. FIG. 6 is a top view of an optical disc having a single-side recording layer having a two-layer structure as viewed from information. FIG. 3 is an explanatory diagram illustrating an example of an arrangement of an OPC area of an optical disc having a single-sided, double-layered recording layer according to the first embodiment of the present invention. It is a flowchart which shows the process of one Embodiment of the optimal recording laser power value determination method of the optical disk of this invention. It is a figure which shows the relationship between recording power, jitter, and (beta). It is a figure explaining the definition of (beta). It is explanatory drawing which shows an example of arrangement | positioning of the OPC area | region of the optical disk of which the recording layer in the 2nd Embodiment of this invention is a single-sided two layer structure. It is explanatory drawing which shows an example of the other structure of the OPC area | region of the optical disk of which the recording layer in the 2nd Embodiment of this invention has a single-sided two-layer structure. It is explanatory drawing which shows an example of arrangement | positioning of the OPC area | region of the optical disk of which the recording layer in the 3rd Embodiment of this invention is a single-sided two layer structure. It is explanatory drawing which shows an example of arrangement | positioning of the OPC area | region of the optical disk of which the recording layer in the 4th Embodiment of this invention has a single-sided three-layer structure. It is explanatory drawing which shows an example of arrangement | positioning of the OPC area | region of the optical disk of which the recording layer in the 5th Embodiment of this invention is a single-sided three-layer structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical disk 2 Optical head 3 Laser drive circuit 4 Servo circuit 5 OPC recording process part 6 Coding circuit 7 Reproduction | regeneration signal processing part 8 OPC reproduction | regeneration processing part 9 System control circuit 20, 30 1st recording layer 21, 31 2nd First recording layer 32 Third recording layer 91 Memory T1, T2, T3 OPC area V1, V2 Free area

Claims (5)

A plurality of recording layers capable of optically recording and reproducing information signals from one side are laminated in the direction of laser beam irradiation from an optical head, and a data area for recording the information signals on each of the plurality of recording layers Information with a determined optimum recording power value for a multi-layered optical disc provided with a test writing area used to determine the optimum recording power value of the emission power of the laser beam at the time of recording the information signal An optical disc apparatus for recording a signal and reproducing a recorded information signal,
When the information signal is recorded on the optical disc for the first time, the test signals of the plurality of recording layers are not overlapped in the stacking direction of the plurality of recording layers so that the test signals of the plurality of recording layers do not overlap each other. The test signal is sequentially recorded and reproduced for each test writing area, the first optimum recording power value of the emission power of the laser beam is obtained for each recording layer, and stored in the recording management information area of the optical disc ,
When the recording of the information signal with respect to the optical disc is performed for the second time or later, a test signal is recorded / reproduced with respect to the test writing area of the first recording layer of the optical disc among the plurality of recording layers. The optimum recording power value for the second and subsequent times of the first layer is obtained, and the optimum recording power value for the second and subsequent times of the other recording layers other than the first layer is the optimum recording power value for the second and subsequent times of the first layer. An optical disc apparatus comprising: a control means for multiplying a value by a ratio of a first optimum recording power value of another recording layer to a first optimum recording power value of the first layer. The control means includes
As the test writing area of each recording layer, one of the inner circumference side and the outer circumference side with respect to the record management information area for recording the record management information provided on the optical disc is used. The optical disc apparatus according to claim 1. The control means includes
As the first layer test writing area, either one of the inner circumference side and the outer circumference side with respect to the record management information area for recording the record management information provided on the optical disc is used, 2. The optical disc apparatus according to claim 1, wherein the second layer is used as a trial writing area on the inner side or the outer side on the recording management information area. The control means includes
When the information signal is recorded on the optical disc for the first time, and test signals are sequentially recorded in the test writing areas of the plurality of recording layers, the test signals are recorded in the test writing areas of the recording layers other than the first layer. On the other hand, after the dummy data is recorded in the first layer area overlapping in the stacking direction, the test signal is recorded / reproduced in / from the test writing area of the recording layer other than the first layer. optical disc apparatus according to any one of claims 1 to 3, wherein the determination of the optimum recording power value. A plurality of recording layers capable of optically recording and reproducing information signals from one side are laminated in the direction of laser beam irradiation from an optical head, and a data area for recording the information signals on each of the plurality of recording layers And an optimum recording of the laser beam emission power on a multi-layered optical disc provided with a test writing area used for determining an optimum recording power value of the laser beam emission power when recording the information signal An optical disc optimum recording power value determining method for determining a power value,
A first step of determining whether the recording of the information signal to the optical disc is a first time or a second time or later;
When the information signal is recorded on the optical disc for the first time, the test signals of the plurality of recording layers are not overlapped in the stacking direction of the plurality of recording layers so that the test signals of the plurality of recording layers do not overlap each other. A test signal is recorded / reproduced sequentially for each test writing area, a first optimum recording power value of the laser beam emission power is obtained for each recording layer, and stored in the recording management information area of the optical disc . Steps,
When the information signal is recorded on the optical disc for the second time or later, a test signal is recorded on and reproduced from the test writing area of the first recording layer of the optical disc among the plurality of recording layers. The optimum recording power value for the second and subsequent times of the first layer is obtained, and the optimum recording power value for the second and subsequent times of recording layers other than the first layer is the optimum recording power value for the second and subsequent times of the first layer. the power value, characterized in that it comprises a third step of obtaining by multiplying the previous SL ratio of first optimum recording power value for other recording layer with respect to the first optimum recording power value of the first layer A method for determining the optimum recording power value of an optical disc.

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