JP2012128932A - Optical disk recording device and optical disk recording method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk recording device capable of further improving write-in accuracy by newly creating a unique write strategy (WST) on the basis of a renewed fundamental WST.SOLUTION: The optical disk recording device includes: a base WST recording means for storing a base WST that is a basis for creating a WST corresponding to an optical disk; a unique WST recording means for storing a unique WST for each optical disk created on the basis of the base WST; and a unique WST creating means for determining whether or not the base WST stored in the base WST recording means is different from the base WST which is stored in the unique WST recording means and on the basis of which the unique WST is created, and when they are different, for creating the unique WST corresponding to the optical disk from the base WST stored in the base WST recording means.

Description

  The present invention relates to an optical disc recording apparatus and an optical disc recording method.

  In an optical disk recording apparatus that records information on an optical disk by irradiating a recording pulse (laser), a write strategy (WST) is used. WST is a parameter that defines the rise and fall timing of the recording pulse waveform and the signal width from the rising edge to the falling edge. By using WST, a recording operation suitable for recording conditions such as the composition of the recording layer of each optical disk, the recording speed and temperature at the time of recording can be performed, and information can be recorded with high accuracy.

  The WST is stored as a unique WST for each optical disc. Such a WST is usually stored in correspondence with an identification code (MID (Manufacturer's Identification) code) of each optical disc (an existing WST corresponding to the existing optical disc is an existing one). WST).

  On the other hand, for an optical disk without an existing WST, there is a technique for creating a new dedicated WST corresponding to the optical disk. According to this technique, a recording write strategy (referred to as a base WST) as a standard is prepared in advance and is created using this base WST, thereby improving the writing accuracy. The WST newly created for the optical disc is stored in a storage unit such as an optical disc recording apparatus, and thereafter used as a unique WST (referred to as a unique WST) corresponding to the optical disc (see Patent Document 1). .

JP 2005-293673 A JP 2007-213731 A

  However, in the above prior art, although the MID code is known in the apparatus in advance, the unique WST newly created for the optical disk without the existing WST is rewritten once stored in the optical disk recording apparatus or the like. There is nothing. On the other hand, the base WST that is the basis for creating the WST itself may be updated to improve accuracy. However, the WTS stored as the created unique WST of the optical disc is not updated.

  For this reason, the unique WST that has been created for a new optical disc may remain in low accuracy even though the base WST that is the base is updated to improve accuracy.

  The present invention has been made based on such a problem, and provides an optical disc recording apparatus capable of further improving the writing accuracy by newly creating a unique WST based on the updated base WST. .

  In order to achieve the above object, an optical disk recording apparatus according to the present invention includes a WST storage means for storing a WST as a basis for creating a WST corresponding to an optical disk, and a unique for each optical disk created based on the WST. Whether the WST storage means for storing the WST is different from the WST stored in the WST storage means and the WST that is stored in the unique WST storage means and that is the origin of the unique WST If it is determined that there is a difference, a unique WST creation unit that creates a unique WST corresponding to the optical disc using the WST stored in the WST storage unit is provided.

  As a result, a unique WST is created based on the updated base WST, and a recording power optimization process (OPC: Optimum Power Control) can be performed, so that the writing accuracy can be further improved.

  In order to achieve the above object, an optical disk recording method according to the present invention includes a step of storing a base WST as a basis for creating a WST corresponding to the optical disk, and a step of storing each of the optical disks created based on the base WST. Storing a unique WST, and determining whether the stored base WST is different from the base WST from which the stored unique base WST is created. If it is determined, the method further includes the step of creating a unique WST corresponding to the optical disc based on the stored base WST.

  As a result, the quality of the recording characteristics of the WST newly created based on the updated base WST and the WST set and stored in the past are compared, and more accurate recording by the WST is executed more reliably. can do.

  According to the present invention, even when the base WST is updated, information can be recorded with higher accuracy by the updated base WST.

1 is a block diagram of an optical disc recording apparatus according to an embodiment of the present invention. It is a flowchart which shows the process for adjusting WST and performing recording operation concerning 1st Embodiment. It is a figure which shows roughly the form in which WST newly created or updated concerning 1st Embodiment is memorize | stored. It is a flowchart which shows the process for adjusting WST and performing recording operation concerning 2nd Embodiment. It is a flowchart which shows the process for comparing the quality of WST concerning 2nd Embodiment. It is a table | surface and a graph which show the effect by 2nd Embodiment.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a block diagram of an optical disk recording apparatus according to an embodiment of the present invention.

  As shown in FIG. 1, an optical disk recording apparatus 200 according to this embodiment is used for recording information on an optical disk 1 using a semiconductor laser and reproducing recorded information. The optical disk recording apparatus 200 includes an optical pickup 10, a head amplifier 20, a binarization circuit 30, a decoder 40, a MID code detection unit 50, a clock shift measurement unit 60, a RAM 70, a data discrimination calculation unit 80, a ROM 90, an EEPROM (Electrically Erasable PROM). ) 100, a write strategy calculation unit 110, a recording pulse adjustment unit 120, an encoder 130, a laser drive unit 140, and a control unit 150.

  The optical disc 1 is, for example, a CD-R, CD-RW, DVD ± R, DVD-RW, DVD-RAM, BD-R, BD-RE, BD-ROM, or the like. Since the optical disc 1 has individual differences in recording conditions (composition, heat storage, recording speed, etc.) of the recording layer, information on individually optimized write strategy (existing write strategy) and laser irradiation power at the time of recording It is necessary to record information with recording parameters including. In the storage area of the optical disc 1, unique information such as the MID code, manufacturer, and model number of the optical disc 1 is recorded in advance. The storage area of the optical disc 1 includes a test area for performing test recording for determining whether or not the accuracy of the set recording parameter is good.

  The optical pickup 10 is for irradiating the optical disc 1 with laser pulse light and receiving reflected light from the optical disc 1. Specifically, the optical pickup 10 includes a laser light source, an optical component, and a light receiving unit, irradiates the optical disc 1 rotated by a spindle motor (not shown) with laser pulse light, and reflects it on the recording surface of the optical disc 1. The reflected light is received. A light emitting element such as a laser diode is used as the laser light source. The optical component includes a collimator lens, an objective lens driven by a focus actuator or a tracking actuator, a polarizing beam splitter, a cylindrical lens, and the like. The light receiving unit includes a plurality of light receiving elements that receive the laser light reflected by the recording surface of the optical disc 1 and convert it into an electrical signal.

  The head amplifier 20 is used to generate an RF signal (data signal), a focus error signal, and a tracking error signal. The RF signal is a signal indicating the total amount of reflected light to each divided region of the light receiving unit, and is generated by detecting the reflected light from the optical disc 1 and calculating the reflected light amount based on the reflected light. The focus error signal is a signal for detecting a focus shift of the irradiation laser of the optical pickup 10, and is generated by, for example, an astigmatism method. The tracking error signal is a signal for detecting a track shift of the irradiation laser of the optical pickup 10, and is generated by, for example, a push-pull method.

  The binarization circuit 30 converts the RF signal generated by the head amplifier 20 into a high or low binarized signal. That is, the binarization circuit 30 is a reproduction signal generation circuit that generates a binary digital signal corresponding to the mark and space of the recording information. For example, the binarization circuit 30 includes 3T, 4T, 5T,. . . The threshold value for converting the analog signal to a binarized square wave is constantly adjusted.

  The decoder 40 decodes the binarized signal generated by the binarization circuit 30 in a predetermined format and outputs it as a reproduction signal. Further, the decoder 40 extracts a reference clock signal from the reproduction signal.

  As described above, the laser light emitted from the optical pickup 10 is reflected by the recording surface of the optical disc 1, and the reflected light is captured by the light receiving unit built in the optical pickup 10 and converted into an electrical signal. The electric signal output from the light receiving unit is calculated and amplified by the head amplifier 20 and then transmitted to the binarization circuit 30 and output as a reproduction signal via the decoder 40.

  Next, a configuration for processing signals output from the head amplifier 20 and the binarization circuit 30 and setting recording parameters (WST and irradiation power) will be described.

  The MID code detection unit 50 detects an MID code that is an ID number for identifying an optical disc. In addition to the MID code, the MID code detection unit 50 uses a WST serial number or a value obtained by check sum (Check Sum) or CRC (Cyclic Redundancy Check) -16 for WST data as WST identification information. Detect as.

  The clock deviation measuring unit 60 reads recorded information as a reproduction signal and measures a deviation from the reproduction signal and a clock edge. Specifically, the clock deviation measuring unit 60 determines the edge deviation corresponding to each of the clock edges based on the binarized signal generated by the binarization circuit 30 and the reference clock extracted by the decoder 40. Measure as deviation. For example, the deviation between the falling edge that changes from the high value corresponding to the space pulse to the low value corresponding to the mark pulse and the corresponding edge of the reference clock is measured. Similarly, the deviation between the rising edge from the low value (mark pulse) to the high value (space pulse) and the corresponding edge of the reference clock is measured.

  The RAM 70 is used to temporarily store data related to the clock edge shift measured by the clock shift measuring unit 60, and is configured by, for example, a DRAM (Dynamic Random Access Memory). Specifically, the data to be stored are each recording pulse or clock edge shift classified by mark length, space length, and combination of mark and space.

  The data discrimination operation unit 80 discriminates clock edge shift data stored in the RAM 70 according to recording pulses, mark lengths, combinations of marks and spaces, and is used to execute various calculations. Specifically, the data discrimination operation unit 80 first discriminates data as necessary from the clock edge shift data stored in the RAM 70. Next, in the calculation, the deviation based on the sample number ratio of various signals, the deviation amount (deviation) from the theoretical center value of each signal distribution, the time difference jitter (Data to Clock (D2C) jitter), the correlation based on the mark edge change amount. Function, influence of adjacent edge due to thermal interference effect, etc. are calculated.

  The ROM 90, the EEPROM 100, and the WST calculation unit 110 together constitute a setting unit and a storage unit for setting and storing a recording parameter including irradiation power and WST for recording information on the optical disc 1.

  The ROM 90 is used to store the base WST of the optical disc recording apparatus 200, particularly as a base WST storage unit. The base WST is a default WST that is calculated and prepared by the designer of the optical disk recording apparatus and is associated with the unique information of the optical disk recording apparatus 200. The ROM 90 can be composed of a flash memory or the like so that stored contents can be rewritten later.

  The EEPROM 100 stores WST calculated by the WST calculation unit 110. Further, when the base WST of the optical disc recording apparatus 200 is updated, the updated base WST is stored in the ROM 90. The base WST is updated by newly creating and supplying the base WST, which is a basis for creating the WST, by the manufacturer of the optical disc recording apparatus 200 and storing it in the optical disc recording apparatus 200. In order to update the base WST, a PC (Personal Computer) (not shown) connected to the optical disc recording apparatus 200 via a network may be used. In the EEPROM 100, a newly created unique WST of the optical disc 1 is stored. That is, the EEPROM 100 functions as a unique WST storage unit. When the WST is newly stored, both the MID code, the WST parameter (data), and the base WST identification information (for example, a value such as CRC-16) uniquely determined from the base WST from which the unique WST is generated Remembered.

  WST calculation section 110 calculates WST based on the data discriminated by data discrimination calculation section 80, and outputs the calculated WST to recording pulse adjustment section 120. Under certain recording conditions, the WST calculated for correcting the deviation amount of the mark edge formed by the recording pulse is set as a new WST and is output to the recording pulse adjustment unit 120 and simultaneously stored in the EEPROM 100. Output and store. That is, the WST is automatically adjusted and stored by the WST calculation unit 110 serving as a unique WST creation unit. In the first WST calculation in which no unique WST exists in the EEPROM 100, the base WST is read from the ROM 90 and output to the recording pulse adjustment unit 120 as a new WST. Even when the base WST is updated, the updated base WST is read from the ROM 90 and similarly output to the recording pulse adjustment unit 120 as a new base WST. In addition, new WST identification information is calculated by the WST calculation unit 110, and the MID code and identification information as storage information are output together with the WST data and stored in the EEPROM 100. The WST data stored here is stored as a unique WST for an optical disc without an existing WST.

  Note that details of the calculation of the specific WST are well-known matters (for example, Patent Document 2), and thus detailed description thereof is omitted.

  The basic functions and operations of the optical disc recording apparatus 200 are the same as those of a generally used optical disc recording apparatus. Since the basic functions and operations are well-known matters, a detailed description is omitted, but the process for automatically adjusting the recording operation based on WST and optimizing the recording power is as follows.

  First, the recording information and the recording parameters (irradiation power, WST) corresponding to the optical disc 1 are read out. When there is no existing or unique WST on the optical disc 1, the base WST stored in the ROM 90 is read.

  The operation of processing the recording pulse for driving the semiconductor laser according to the recording parameter is as follows. When a recording signal of data as recording information is input, the optical disc recording apparatus 200 forms a recording pulse via the encoder 130 and the recording pulse adjustment unit 120, and inputs the recording pulse to the laser driving unit 140. The optical disk is irradiated with a pulse laser to form mark and space column information and record data.

  The encoder 130 is a circuit that converts a recording signal into, for example, a 1-7PP modulation signal and outputs the converted signal to the recording pulse adjustment unit 120. In the case of a Blu-ray Disc (registered trademark), the 1-7PP modulation signal includes a mark length of 2T to 9T and a space length of 2T to 9T.

  The recording pulse adjustment unit 120 is used to adjust the recording pulse based on the set recording parameter and output it to the laser driving unit 140 when the recording pulse is formed from the input 1-7PP modulation signal. .

  The laser driver 140 drives the laser of the optical pickup 10. Specifically, the laser driving unit 140 drives the laser diode by supplying the recording pulse generated by the recording pulse adjusting unit 120 to the laser diode of the optical pickup 10.

  As described above, the recording signal input to the encoder 130 is pulse-patterned so as to include a mark pulse and a space pulse such as a 1-7PP modulation signal, and then output to the recording pulse adjustment unit 120. The recording pulse adjustment unit 120 generates a recording pulse with the pulse pattern adjusted in accordance with the WST set by the WST calculation unit 110 and supplies the recording pulse to the laser driving unit 140. Then, the laser drive unit 140 is driven according to the recording pulse, and information is recorded on the recording surface of the optical disc 1 by the irradiated pulse laser.

  The controller 150 controls the recording operation and the reproducing operation of the optical disc recording apparatus 200. Specifically, the control unit 150 has a control function related to adjustment, comparison, storage, and update of the recording pulse irradiation power and WST in addition to the control function related to normal recording operation and reproduction operation.

  The optical disc recording apparatus 200 may include components other than the components described above, or may not include some of the components described above.

  As described above, the outline of the signal processing in the recording system and the reproducing system of the optical disc recording apparatus 200 of the present embodiment has been described. Since the other components of the optical disk recording apparatus of the present embodiment are the same as those of the conventional optical disk apparatus, description thereof is omitted.

(First embodiment)
The process for adjusting the WST and executing the recording operation according to the first embodiment of the present invention will be described below.

  FIG. 2 is a flowchart showing processing for adjusting a WST and executing a recording operation according to the first embodiment. FIG. 3 is a schematic diagram showing a form in which a newly created or updated WST according to this embodiment is stored. FIG. The processing according to the present embodiment is executed after the base WST of the optical disc recording apparatus 200 is updated and before the recording operation is performed on the optical disc 1.

  As shown in FIG. 2, first, an MID code is acquired (S101). In this step, the MID code detection unit 50 detects the MID code that is the identification information of the optical disc 1 loaded in the optical disc recording apparatus 200.

  Subsequently, it is determined whether there is a unique WST stored in the EEPROM 100 (S102). If there is an existing WST that matches the MID code of the optical disc 1 in the ROM 90, the existing WST is excluded because it is used. In this step, when the unique WST of the optical disc 1 is detected, if there is a post-created unique WST that matches the MID code of the optical disc 1, the unique WST is detected. If it is determined that both the existing and unique WSTs are not present, the process proceeds to step S107 described later.

  On the other hand, when it is determined that the unique WST exists in the EEPROM 100 (S102: YES), the detected base WST of the unique WST and the base WST stored in the ROM 90 are compared (S103). In this step, the identification information of the base WST, which is the creation source, attached to the unique WST detected in step S102 is compared with the identification information of the base WST stored in the ROM 90. By comparing the identification information, it can be determined whether or not the base WST has been updated.

  Subsequently, it is determined whether or not they are the same base WST (S104). In this step, it is determined whether or not the base WST compared in step S103 is the same. If it is determined that they are not the same base WST (S104: NO), the process proceeds to step S107 described later.

  On the other hand, when it is determined that they are the same base WST (S104: YES), the unique WST is read (S105). In this step, since it is determined that the base WST is the same as the base WST from which the unique WST optimized for the optical disc 1 is created, the new unique WST is not automatically adjusted. The unique WST detected in step S102 is read for use in subsequent processing.

  Subsequently, OPC is executed (S106). In this step, the recording power is optimized using the unique WST read in step S105.

  In step S107, the base WST is read from the ROM 90. Specifically, the base WST is read in order to automatically adjust and create a new unique WST based on the base WST for the optical disc 1 that has been determined to have no unique WST in step S102. This step is also executed when it is determined in step S104 that the base WST that is the basis of the unique WST is not the same as the base WST of the ROM 90.

  Subsequently, the WST is automatically adjusted based on the base WST (S108). In this step, the WST is optimized based on the base WST, a new WST is created as a specific WST, and OPC is executed based on the specific WST. That is, even if the unique WST already exists, if it is determined in step S104 that the creation source base WST is different, a unique WST is newly created based on the updated base WST.

  Subsequently, identification information of the created unique WST is stored (S109). In this step, the identification information of the base WST of the unique WST is generated as identification information about the unique WST newly created in step S108, and is stored in the EEPROM 100 together with the MID code and WST data. The form in which the MID code, the identification information of the base WST, and the WST data are stored is as shown in FIG. As shown in FIG. 3, the base WST identification information may be stored along with the MID code and WST data. The identification information of the base WST may be an arbitrarily assigned serial number, or obtained by calculating the checksum or CRC-16 of the base WST data in order to improve the discrimination of the base WST. The value may be used as identification information.

  Subsequently, information recording is executed (S110). That is, data is written on the optical disc 1 using the unique WST. Then, the process of adjusting the WST and executing the recording operation is finished.

  As described above, in this embodiment, the unique WST is created based on the updated base WST and OPC can be executed, so that the writing accuracy can be further improved. In the present embodiment, since the base WST can be identified by an identification number unique to each base WST, it is possible to easily and reliably determine whether or not the base WST has been updated.

(Second Embodiment)
The process for adjusting the WST and executing the recording operation according to the second embodiment of the present invention will be described below.

  FIG. 4 is a flowchart showing processing for adjusting a WST and executing a recording operation according to the second embodiment. FIG. 5 is a flowchart showing processing for comparing the quality of WST according to the second embodiment. FIG. 6 is a table and a graph showing effects according to the second embodiment. Of the processes for adjusting the WST according to the present embodiment and executing the recording operation, the same processes as those for adjusting the WST according to the first embodiment and executing the recording operation are described below. Description is omitted.

  As shown in FIG. 4, first, an MID code is acquired (S201). This step is the same as step S101 described above.

  Subsequently, it is determined whether there is a unique WST (S202). This step is the same as step S102 described above. If it is determined that there is no unique WST (S202: NO), the process proceeds to step S211 described later.

  On the other hand, when it is determined that there is a unique WST (S202: YES), the detected base WST of the unique WST and the base WST of the ROM 90 are compared (S203). This step is the same as step S103 described above.

  Subsequently, it is determined whether or not they are the same base WST (S204). This step is the same as step S204 described above. If it is determined that they are not the same base WST (S204: NO), the process proceeds to step S207 described later.

  Subsequent steps S205 and S206 are the same as steps S105 and 106 in FIG. 2 described above.

  In step S207, the updated base WST is read. Specifically, in step S204, since it is determined that the updated base WST and the base WST of the unique WST are not the same, the WST is newly adjusted and created based on the updated base WST. Then, the updated base WST is read out.

  Subsequently, the WST is automatically adjusted based on the updated base WST (S208). In this step, similar to step S108 described above, a new unique WST is created based on the updated base WST, and OPC is executed based on the new unique WST.

  Subsequently, the quality of the existing WST and the automatically adjusted unique WST are compared (S209). In this step, the quality of the old unique WST read in step S202 and the new unique WST newly created in step S208 are compared by performing test recording.

  As shown in FIG. 5, first, recording is performed for the old unique WST (S301). In this step, a test recording operation is performed using the test area of the optical disc 1 based on the old unique WST detected in step S202.

  Subsequently, jitter is measured (S302). In this step, the jitter of the RF signal obtained by reproducing the information recorded in step S301 is calculated. The jitter is calculated by the data discrimination calculation unit 80, for example.

  Subsequently, recording is performed for the new unique WST (S303). In this step, a test recording operation is executed based on the new unique WST newly created in step S208.

  Subsequently, jitter is measured (S304). In this step, the jitter of the RF signal obtained by reproducing the information recorded in step S303 is calculated.

  Subsequently, the WST with a small jitter is stored as a specific WST (S305). In this step, the WST with the smaller jitter measured in steps S302 and S304 is selected as a new unique WST and set as the unique WST of the optical disc 1.

  Subsequently, returning to FIG. 4, the WST set as the unique WST is stored (S210). The stored contents and their modes are as shown in FIG.

  The process of steps S211 to S214 is the same as the process of steps S107 to 110 described above.

  FIG. 6 is a table and graph showing the effects of this embodiment. 6A is a table showing characteristics of the base WST (WST1) before update and the WST (WST2) after update, and FIGS. 6B and 6C are D2C of data recorded based on WST1 and WST2. FIG. 6 (D) is a graph comparing jitter, and each of the base WST and the β value 2% after the edge optimization process (EPO) of the base WST is shown in FIGS. 6 (B) and (C). A table showing the degree of D2C jitter, FIG. 6E is a graph comparing D2C jitter with respect to β after EPO of each base WST shown in FIGS. 6B and 6C.

  Specifically, FIGS. 6B and 6C are generated by jitter generated by each base WST shown in FIG. 6A and WST after optimization (EPO) of each WST. It is a figure which compares with the jitter to be performed. In FIGS. 6B and 6C, the value (%) of D2C Jitter (jitter) is plotted against the β value (%). The β value is obtained by β = (A−B) / (A + B) * 100 (A is a positive integer representing the peak value of the RF signal, and B is a positive integer representing the bottom value of the RF signal). Value.

  As shown in FIG. 6D, the jitter at β = 2% after EPO of WST1 and WST2 is 8.51 and 8.20, respectively, and there seems to be no significant difference between WST1 and 2. . However, as shown in FIG. 6E, when the graphs after EPO of each base WST are compared, it can be seen that the β margins are different. That is, as shown in FIG. 6 (F), based on FIG. 6 (E), when the upper and lower limits of the β value at 15% jitter are compared for each base WST, the β margin is updated to the updated WST2 It can be seen that this is 22.1%, which is higher than 19.0% according to WST1 before update. That is, it can be seen that the updated recording characteristics of WST2 are superior to the recording characteristics of WST1 before the update.

  As described above, in the present embodiment, the quality of the recording characteristics of the WST newly created based on the updated base WST and the WST set and stored in the past is compared with each other more reliably. In addition, highly accurate recording by WST can be executed.

  Although the embodiment to which the present invention is applied has been described above, the present invention is not limited to such an embodiment. For example, it has been described that the processing according to the present embodiment is executed when the optical disc is loaded after the base WST of the optical disc recording apparatus 200 is updated. However, it is not limited to this. It can be executed at any timing.

  Further, in the above-described embodiment, a mode has been described in which the jitter is compared and the WST with less jitter is adopted as the specific WST. However, it is not limited to this. Comparing not only jitter but also PI error (data error in internal parity (PI)) values, or performing power fluctuation recording after WST recording, a range of β that falls below the specified jitter (or PI error) (β A method of comparing the margin) may be adopted.

  In the embodiment described above, the EEPROM 100 is used as a storage unit for the newly created unique WST. However, it is not limited to this. A storage unit of a PC (not shown) connected to the optical disc apparatus 200 via a network may be configured so that the optical disc apparatus 200 can read and write.

  Although the data shown in FIG. 6 has been described as the effect of the second embodiment, the same effect that the recording by the high-precision WST can be executed by updating the base WST also in the first embodiment. Played.

  In addition, it goes without saying that various modifications are possible within the scope of the technical idea described in the claims of the present application.

1 optical disc,
10 Optical pickup,
20 head amplifier,
30 Binarization circuit,
40 decoder,
50 MID code detector,
60 Clock shift measurement unit,
70 RAM,
80 Data discrimination calculation unit,
90 ROM,
100 EEPROM,
110 WST calculation unit,
120 recording pulse adjustment unit,
130 encoder,
140 laser driver,
150 control unit,
200 Optical disk recording device.

Claims (6)

A base write strategy storage means for storing a base write strategy as a base for creating a write strategy corresponding to an optical disc;
Unique write strategy storage means for storing a unique write strategy for each of the optical discs created based on the base write strategy;
Whether or not the base write strategy stored in the base write strategy storage means is different from the base write strategy stored in the unique write strategy storage means and from which the unique write strategy is created. A unique write strategy creating means for creating a unique write strategy corresponding to the optical disc based on a base write strategy stored in the base write strategy storage means, if different,
An optical disc recording apparatus comprising: A base write strategy updating unit for updating the base write strategy stored in the base write strategy storage unit, and the base write strategy updating unit gives different identification information when updating the base write strategy. Stored in the base light strategy storage means,
The unique write strategy creation means assigns the identification information of the base write strategy that is the creation source when creating the unique write strategy, and creates the created unique write strategy in the unique write strategy storage means. The optical disc recording apparatus according to claim 1, wherein the discriminating information is stored and the discriminating information is discriminated in the judgment. Comparing means for comparing the write quality by the unique write strategy newly stored in the unique write strategy storage means with the write quality by the unique write strategy stored in the unique write strategy storage means,
The comparison means stores the newly created unique write strategy in the unique write strategy storage means when the quality of the newly created unique write strategy is excellent. 2. An optical disk recording apparatus according to 1. Storing a base write strategy as a basis for creating a write strategy corresponding to the optical disc;
Storing a unique write strategy for each of the optical discs created based on the base write strategy;
Determining whether the stored base write strategy is different from the base light strategy from which the stored unique base write strategy is created;
Including
An optical disc recording method, further comprising the step of creating a unique write strategy corresponding to the optical disc based on the stored base write strategy when it is determined that they are different. Updating the stored base light strategy;
The step of updating the base light strategy includes:
Providing different identification information when updating the base light strategy and storing it in the base light strategy storage means;
In the step of storing the unique write strategy, when creating the unique write strategy, the identification information of the base write strategy that is the creation source is added, and the created unique write strategy is stored. Determining whether the identification information matches in the determination;
The optical disc recording method according to claim 4, further comprising: Further comprising the step of comparing the write quality by the newly created unique write strategy with the write quality by the unique write strategy before the newly created,
The step of comparing the write quality further includes a step of storing the newly created unique write strategy when the quality of the newly created unique write strategy is excellent. 5. The optical disk recording method according to 5.