JP4970372B2 - Recording parameter setting device and information recording medium - Google Patents

Description

  The present invention relates to a recording parameter setting device, an information recording medium, and a reproducing device for recording and reproducing information.

  In a recording / reproducing apparatus for an information recording medium (for example, an optical disk) for recording a large amount of data, information is recorded by changing the physical characteristics of the medium by condensing and heating a laser beam on the information recording medium. This technique has been used conventionally. Two states, a state in which a recording mark is formed on an information recording medium (hereinafter referred to as “mark”) and a state in which a recording mark is not formed (hereinafter referred to as “space”), and the length of the two states As a result, binary digital data is recorded on the information recording medium. Here, the digital data is referred to as recording information. When recording information is actually recorded on the information recording medium, a recording mark is formed on the information recording medium by changing the laser beam using a recording parameter set in accordance with the recording information to be recorded. Record.

  Further, in recent years, recording speed has been increased in order to shorten the processing time of the recording / reproducing apparatus with respect to the increase in the data capacity to be handled. An information recording medium capable of high-speed recording is also desired to be able to record at low speed for backward compatibility, and therefore has a characteristic that heat is likely to accumulate in order to improve recording sensitivity. Since the above heat accumulation may cause distortion of the recording mark and deteriorate the reproduction signal quality, it is important to control the heat for forming the recording mark in an information recording medium capable of high-speed recording. ing.

  A write strategy that is an advanced laser output control technique is known as a technique used to control heat for forming a recording mark. In the write strategy, laser output control is performed based on the recording parameters described above. Thus, the heat for recording mark formation is controlled. Therefore, the larger the number of recording parameters, the more complicated the control of heat for forming recording marks. In addition, when recording parameters are recorded on an information recording medium as a reference table and read and set by a recording / reproducing apparatus, a processing time for reading information of the reference table by the recording / reproducing apparatus when the number of recording parameters is large. Becomes longer, and it takes time to start recording. Therefore, it is desirable that the number of recording parameters used is as small as possible.

  Thus, for example, Patent Document 1 discloses an optical disc recording method that includes a reference table defined for recording parameters and controls heat for forming recording marks while referring to the table.

Specifically, in Patent Document 1, among the recording parameters, the front space length of the recording mark is set to 2T, 3T, 4T with respect to the leading pulse for controlling the heat of the front edge, which is the position where the recording mark starts to be formed. A reference table is used that is classified into four types of 5T or more and the recording mark length is classified into three types of 2T, 3T, and 4T or more (see FIG. 17). In addition, among the recording parameters, the last pulse for controlling the heat of the trailing edge, which is the position where the recording mark is completely formed, is classified into four types, that is, 2T, 3T, 4T, 5T or more. In addition, a reference table in which recording mark lengths are classified into two types of 3T and 4T or more is used (see FIG. 18). That is, in Patent Document 1, the number of recording parameters is reduced by combining the mark length classifications in the reference table into the same classification at 4T or more, and combining the front space length and the rear space length classification into the same classification at 5T or more. Thus, the heat of the front edge and the heat of the rear edge for recording mark formation are controlled. Here, T represents the time for one clock cycle. Therefore, for example, the 2T mark length represents an area where a recording mark of “1” is formed in a time corresponding to two clock cycles, that is, a recording area, and the 2T space length is recorded in a time corresponding to two clock cycles. This represents a region where no mark is formed.
JP 2005-92942 A (published April 7, 2005)

  As recording speed increases, recording marks will be formed on information recording media with improved recording sensitivity. When a recording mark is formed by laser light, the heat distribution is biased toward the trailing edge of the recording mark, which is the position where the recording mark has been formed, so that the tendency to accumulate heat at the trailing edge becomes stronger as the recording speed increases. It will be. Therefore, there is a need for more precise control of the heat at the trailing edge depending on the recording parameters.

  However, in Patent Document 1, recording parameters are classified for controlling the heat of the front edge, which is the position where the recording mark starts to be formed, and recording is performed for controlling the heat of the rear edge that requires strict control. The parameter classification is set to the same setting. That is, all use a reference table in which recording mark lengths of 4T or more are classified into the same classification. Further, in the reference table in which the recording parameters are defined, it is not specifically disclosed what the classifications of the recording mark lengths and the front and rear space lengths are summarized in order to reduce the number of recording parameters. Therefore, although the number of recording parameters is kept small, there is no guarantee that good reproduction signal quality is obtained when the recording mark is actually read out (there is no guarantee that the predetermined reproduction signal quality is satisfied). Had.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to form a recording mark capable of more reliably obtaining a good reproduction signal quality while suppressing the number of recording parameters to be used. It is an object of the present invention to provide a recording parameter setting device, an information recording medium, and a reproducing device that enable the above.

  A recording parameter setting device according to the present invention is a recording parameter setting device for setting a recording parameter of a pulse train for forming a recording mark on an information recording medium according to recording information, in order to solve the above-described problem. 1 A pulse train for forming each recording mark from a predetermined recording mark length to a maximum recording mark length includes a head part including a head pulse, a terminal part including a terminal pulse and a cooling period, the head part and the terminal For forming each recording mark from a recording mark length shorter than the first predetermined recording mark length to a minimum recording mark length. The pulse train includes a leading portion including a leading pulse and a trailing portion not including a trailing pulse and including a cooling period, and the recording parameter includes the recording mark A first recording parameter group composed of the recording parameters of the leading portion for controlling the heat of the leading edge, and a recording parameter of the terminal portion for controlling the heat of the trailing edge of the recording marks. The first recording parameter group is classified according to at least the recording mark length of the recording information, and is the largest from the first predetermined recording mark length. Up to the recording mark length, the second recording parameter group is classified according to at least the recording mark length of the recording information, and the maximum length from the second predetermined recording mark length. The recording mark length is classified into the same, and the second predetermined recording mark length is a recording mark length longer than the first predetermined recording mark length. It is set to.

  Further, in the recording parameter setting device of the present invention, in addition to the above configuration, the recording parameter of the termination portion included in the second recording parameter group is a falling position of the termination pulse, and the falling position of the termination pulse When moving the terminal pulse, it is not necessary to change the width of the terminal pulse.

  In the recording parameter setting device of the present invention, in addition to the above configuration, the moving direction of the trailing position of the terminal pulse may be a direction in which the terminal pulse approaches the head pulse.

  Further, in the recording parameter setting device of the present invention, in addition to the above configuration, the recording parameter of the termination portion included in the second recording parameter group is a falling position of the termination pulse, and the falling position of the termination pulse The first predetermined recording mark length or more may be classified into the first predetermined recording mark length and a recording mark length other than the first predetermined recording mark length.

  In addition to the above-described configuration, the recording parameter setting device of the present invention classifies the falling edge position of the terminal pulse at or above the first predetermined recording mark length into the first predetermined recording mark length and the first predetermined recording mark. Categorized into recording mark lengths other than the length, and the falling position of the end pulse of the recording mark length other than the first predetermined recording mark length is set to the falling position of the end pulse of the first predetermined recording mark length, Different values may be set.

  In addition to the above-described configuration, the recording parameter setting device of the present invention may be configured such that the falling position of the terminal pulse other than the first predetermined recording mark length is set to the falling position of the terminal pulse having the first predetermined recording mark length. Thus, the time axis direction may be set so as to be relatively shifted in the opposite direction to the time traveling direction.

  In the recording parameter setting device of the present invention, in addition to the above configuration, the second recording parameter group may further include a cooling end position at which a cooling period of a pulse train for forming the recording mark ends.

  In the recording parameter setting device of the present invention, in addition to the above configuration, the second recording parameter group may further include a cooling start position where a cooling period of a pulse train for forming the recording mark starts.

  In the recording parameter setting device of the present invention, in addition to the above configuration, the first recording parameter group may include a rising position of the leading pulse.

  In the recording parameter setting device of the present invention, in addition to the above configuration, the first recording parameter group may include the width of the leading pulse.

  In the recording parameter setting apparatus of the present invention, in addition to the above configuration, the first predetermined recording mark length may be 4T or more.

  In addition to the above configuration, the information recording medium of the present invention may record a recording parameter set by the recording parameter setting device in a predetermined area.

  In addition to the above configuration, the playback apparatus of the present invention may play back the information recording medium.

  According to the present invention, since the recording parameter satisfying the predetermined reproduction signal quality is determined while increasing the number of classifications of the recording parameter group, the recording parameter satisfying the predetermined reproduction signal quality is determined. It is possible to reduce the number of recording parameter group classifications. Furthermore, since at least the recording parameters for controlling the heat of the trailing edge are determined so as to satisfy the predetermined reproduction signal quality, the good reproduction signal is compensated for the influence of the heat accumulated on the trailing edge. It is possible to form a recording mark with high quality. Therefore, there is an effect that it is possible to form a recording mark that can surely obtain a good reproduction signal quality while suppressing the number of recording parameters to be used.

[Embodiment 1]
One embodiment of the present invention will be described below with reference to FIGS.

  First, an optical disc apparatus (recording / reproducing apparatus) 1 will be described as an example of the recording / reproducing apparatus according to the present embodiment. As shown in FIG. 2, the optical disc apparatus 1 according to the present embodiment includes an optical head (optical pickup) 11, a pickup 12, a pickup driving circuit 13, a laser driving circuit 14, a reproducing circuit 15, and a control unit 20. Yes. The pickup driving circuit 13, the laser driving circuit 14, and the reproducing circuit 15 constitute a recording / reproducing circuit group 10. The optical disk device 1 is a device that records and reproduces information with respect to the optical disk 2. The optical disk 2 may be an optical disk, and the type thereof is not limited, for example, a magneto-optical disk.

  First, the optical head 11 is provided in the pickup 12, and the optical head 11 irradiates the optical disk 2 with a light beam (laser beam) for recording and reproducing information and detects reflected light from the optical disk 2. And output to the reproduction circuit 15. The pickup 12 includes an optical head 11 for recording and reproducing data, and is movable with respect to the optical axis direction and the radial direction that is the longitudinal direction of the optical disc 2.

  Subsequently, the pickup driving circuit 13 drives the pickup 12 in accordance with a control signal from the control unit 20, and the pickup 12 is moved with respect to a track (not shown) of the optical disc 2, that is, in the radial direction and the optical axis direction. It is to be moved. Further, the laser drive circuit 14 controls the output of the light beam emitted from the optical head 11. The reproduction circuit 15 converts the reflected light detected by the optical head 11 into a reproduction signal and outputs it to the control unit 20.

  The control unit 20 sets recording parameters for recording marks that are information to be recorded on the optical disc 2. The control unit 20 moves the pickup 12 via the pickup drive circuit 13 and irradiates the light beam from the optical head 11 via the laser drive circuit 14. The reproduction signal obtained by converting the reflected light detected by the optical head 11 is also received from the reproduction circuit 15. The control unit 20 will be described in detail later.

  Next, an outline of the optical disc 2 on which information is recorded by the optical disc apparatus 1 will be described with reference to FIG. The optical disk 2 includes a setting area 41 and a user area 42 as shown in FIG. The setting area 41 is an area (part) for performing trial recording of information, and the user area 42 is a part for recording information desired by the user. The setting area 41 is also an area in which a reference table described later is recorded.

  Note that the position of the setting area 41 is not limited to the position shown in FIG. 3, and may exist at an arbitrary radial position of the optical disc 2, or a plurality of setting areas 41 may exist.

  Next, an operation of recording information on the optical disc 2 by the optical disc apparatus 1 and an operation of reproducing information recorded on the optical disc 2 by the optical disc apparatus 1 will be briefly described.

  When information is recorded on the optical disc 2 by the optical disc apparatus 1, the control unit 20 first sets recording parameters based on the recording information. Then, a recording light beam is irradiated from the optical head 11 onto the setting area 41 of the optical disc 2, and information is recorded on the track of the setting area 41 of the optical disc 2. When the information recorded on the optical disk 2 is reproduced by the optical disk device 1, first, the control unit 20 moves the pickup 12 from the setting area 41 or the user area 42 of the optical disk 2 via the pickup drive circuit 13. Move to the recording site where the information is recorded. Then, the control unit 20 irradiates a reproduction light beam from the optical head 11 via the laser drive circuit 14 to the track of the recording site where the information on the optical disk 2 is recorded. The reflected light detected by the optical head 11 is converted into a reproduction signal by the reproduction circuit 15 and input to the control unit 20. Thereby, the optical disc apparatus 1 can reproduce the information recorded on the track of the optical disc 2. Here, the recording information includes two states, a state in which a recording mark is formed on the optical disc 2 (mark) and a state in which no recording mark is formed (space), and the length of the two states. It represents binary digital data recorded on (information recording medium). Therefore, in the recording information, there are two states, a state in which a recording mark is formed on the optical disc 2 set as a recording parameter (mark) and a state in which no recording mark is formed (space), and the lengths of the two states. It will be specified.

  Further, as described above, the optical disc apparatus 1 according to the present embodiment performs recording (trial recording) in the setting area 41 of the optical disc 2 as described above, and based on the value of the reproduction signal obtained by reproducing the information of the trial recording. Thus, the recording parameter is set by the control unit 20. Information is recorded on each track of the user area 42 according to the set recording parameter. Note that the recording operation to the user area 42 after the recording parameter setting of the optical disc apparatus 1 is the same as a generally known recording operation, and a detailed description thereof is omitted here. The recording parameter setting in the control unit 20 will be described in detail later together with the description of the control unit 20.

  The recording parameters will be described with reference to FIGS. 4 and 5 before the control unit 20 and the setting of the recording parameters in the control unit 20 are described in detail. In the following description, (1, 7) RLL (Run Length Limited code) is described as an example of the modulation scheme, but in this embodiment, the modulation scheme is (1, 7) RLL modulation scheme. It is not limited. The (1, 7) RLL code is a code in which the minimum value and the maximum value of the inversion interval are limited in magnetic and optical digital recording.

  Further, in this (1,7) RLL modulation system, the pulse train of recording pulses is composed of a shortest recording mark 2T having a head portion and a terminal portion, whereas the pulse train of recording pulses is shorter than the shortest recording mark. In the case of a long recording mark, an intermediate portion corresponding to the mark length is added between the head portion and the end portion. In other modulation systems, for example, the shortest recording mark length starts from 3T, and at this time, the shortest recording mark length is composed of a head portion, an intermediate portion, and a terminal portion (for example, DVD-RW etc.). In addition, there are some which are composed only of the head (for example, DVD-R). Here, T represents the time for one clock cycle. Therefore, for example, when the recording mark length is 3T, it represents a recording area where a recording mark is formed in a time corresponding to three clock cycles.

  As shown in FIG. 4, in the optical disc 2, a pulse train of recording pulses corresponding to recording information is set in consideration of a medium temperature distribution for recording. FIG. 4 shows a recording pulse corresponding to the recording information, taking as an example a case where the recording information has a recording mark length of 5T. The pulse train of the recording pulse is represented by time and the power of the recording pulse. The horizontal axis direction in FIG. 4 represents the irradiation time, and the vertical axis direction in FIG. 4 represents the recording pulse power.

  As described above, the pulse train is composed of a head part, a terminal part, and an intermediate part. As shown in FIG. 4, here, the portion composed of the leading edge position and the leading pulse is the leading portion, the trailing edge portion, the leading edge position, the cooling period, and the portion composed of the cooling end position is the terminating portion, the leading pulse. A portion constituted by an intermediate period that is a period between the terminal pulse and the end pulse is defined as an intermediate portion. The pulse train is also composed of recording power, space power, intermediate power, and bias (cooling) power, as shown in FIG. In this embodiment, the recording power, space power, intermediate power, and bias (cooling) power constituting the pulse train are referred to as recording power parameters. These recording power parameters are included in the recording parameters described above. In FIG. 4, the recording powers of the recording pulses at the beginning and the end are the same, but the recording power is not necessarily limited to this, and the recording power may be different at the tip and the end. In FIG. 4, the power decreases in the order of recording power, space power, intermediate power, and bias (cooling) power, but the power is not necessarily limited thereto. However, it is preferable that either the recording power of the recording pulse at the head portion or the terminal portion is the largest and the cooling power is the smallest.

  FIG. 5 shows a pulse train and recording pulse parameters for forming each recording mark from a recording mark length of 2T to a recording mark length of 9T. In FIG. 5, a recording mark with a recording mark length of 2T and a recording mark with a recording mark length of 3T are composed of a leading pulse and a cooling period, and a recording mark having a recording mark length of 4T or more is composed of a leading pulse and an intermediate period. , An end pulse and a cooling period are shown. In FIG. 5, dTtop is the leading edge position, which is the leading pulse start position, Ttop is the leading pulse width, dTe is the cooling end position at the end of the cooling period, and Tlp is the trailing pulse width, dTlp. Indicates the falling position of the end pulse (end falling position). Note that dTlp is the falling position of the end pulse, and can also be said to be the cooling start position of the cooling period at the end of the pulse train. Further, dTe is a cooling end position at which the cooling period of the end portion ends, and can also be said to be a start position of a period during which the space power Ps is irradiated following the cooling period. dTtop, dTe, and dTlp are each set by the time from the reference timing of the clock, and dTtop is based on the rising position (position from 0 to 1) of the recording information corresponding to each recording mark length. The time is set, and dTe and dTlp are set with time based on the falling position (position from 1 to 0) of the recording information corresponding to each recording mark length. At this time, the same standard is used for all recording mark lengths. In FIG. 5, dTtop is set with a time based on the rising position of the recording information, but it may be based on a position shifted by a predetermined clock interval from the rising position of the recording information. Similarly, in FIG. 5, dTe and dTlp are set with a time based on the falling position of the recording information, but may be based on a position shifted by a predetermined clock interval from the falling position of the recording information. The deviation amount of the reference position from the falling position of the recording information may be set separately for dTe and dTlp. In this embodiment, dTtop, Ttop, dTe, Tlp, and dTlp that define the timing of the recording pulse are referred to as recording pulse parameters. These recording pulse parameters are included in the recording parameters described above.

  In FIG. 5, the width of the head pulse is set by Ttop, but the period of the head pulse can be expressed even if the recording pulse parameter is set at the falling position of the head pulse. Similarly, although the end pulse width is set by Tlp, the end pulse period can be expressed even if the recording pulse parameter is set at the rising position of the end pulse.

  By changing the value of the recording pulse parameter, the shape of the formed recording mark changes. Since dTtop and Ttop constituting the leading portion change the shape of the front edge, which is the position where recording marks start to be formed, the heat of the front edge can be controlled by the dTtop and Ttop parameters of the recording pulse parameters. it can. Further, dTe, Tlp, and dTlp constituting the end portion change the shape of the trailing edge, which is the position where the formation of the recording mark is completed, so that the trailing edge depends on the parameters of dTe, Tlp, and dTlp among the recording pulse parameters. The heat can be controlled. In addition, since the change in the intermediate power value of the recording power parameter changes the heat accumulation in the intermediate portion, the recording mark between the front edge and the rear edge is determined by the intermediate power parameter of the recording power parameter. The shape can be controlled.

  The recording parameter values including the recording power parameter and the recording pulse parameter described above are recorded in the setting area 41 in the form of a reference table (recording parameter group), read by the optical disc apparatus 1 and stored in the storage unit 3. (Recorded). The storage unit 3 may be an information recording medium such as a memory, a server, or the like, and may be provided in the optical disc apparatus 1 or may be provided so as to be connectable to the outside of the optical disc apparatus 1. . Details of the reference table will be described later.

  Next, setting of recording parameters in the control unit 20 of the optical disc apparatus 1 will be described in detail. First, the outline of the configuration of the control unit 20 will be described with reference to FIG. FIG. 1 is a functional block diagram showing the configuration of the control unit 20 in the present embodiment.

  As shown in FIG. 1, the control unit 20 includes a recording parameter setting unit (recording parameter setting device) 21. The recording parameter setting unit 21 functions to set a recording parameter of a recording mark that is information to be recorded on the optical disc 2 among the functions of the control unit 20, and to irradiate the optical head 11 with a light beam via the laser driving circuit 14, In addition, it plays a role of receiving a reproduction signal obtained by converting the reflected light detected by the optical head 11 from the reproduction circuit 15. The recording parameter setting unit 21 includes a recording information acquisition unit 22, a test recording parameter setting unit (trial recording parameter setting unit) 23, a test recording instruction unit 24, a reproduction signal acquisition unit 25, and a reproduction signal quality determination unit (reproduction signal quality). Determination means) 26 and a recording instruction unit 27, and the above-described units perform the functions described above.

  The recording information acquisition unit 22 acquires recording information to be recorded on the optical disc 2. The acquisition source of the record information may be any of a control unit higher than the control unit 20, a memory storing the record information, a server, or the like. The acquisition source of the record information may be provided in the optical disc apparatus 1. The optical disk device 1 may be connected to the outside.

  Further, the test recording parameter setting unit 23 makes an inquiry to the storage unit 3 based on the recording information acquired by the recording information acquisition unit 22, so that the recording parameter among the recording parameters defined in the reference table of the storage unit 3 Recording parameters corresponding to the recording information are obtained, and trial recording parameters for the trial recording operation are set. The trial recording parameter setting unit 23 performs trial recording when receiving an instruction (test recording parameter change instruction) for resetting the trial recording parameters for the trial recording operation from the reproduction signal quality determination unit 26 described later. The parameter is reset. The resetting of the test recording parameter will be described later.

  Then, the test recording instruction unit 24 instructs the pickup drive circuit 13 and the laser drive circuit 14 to perform a test recording operation on the setting area 41 of the optical disc 2 in accordance with the test recording parameters set by the test recording parameter setting unit 23. Is to do.

  The reproduction signal acquisition unit 25 acquires, from the reproduction circuit 15, a reproduction signal obtained from a recording mark that has been subjected to trial recording in the setting area 41 of the optical disc 2 according to an instruction from the trial recording instruction unit 24.

  The reproduction signal quality determination unit 26 determines whether the test recording parameter used for the test recording is good or bad based on the reproduction signal acquired by the reproduction signal acquisition unit 25. The reproduction signal quality determination unit 26 determines whether the test recording parameter used for the trial recording is good or not according to whether or not the reproduction signal acquired by the reproduction signal acquisition unit 25 satisfies a predetermined reproduction signal quality. When the reproduction signal satisfies a predetermined reproduction signal quality, the reproduction signal quality determination unit 26 determines (sets) the test recording parameter used for the test recording as a recording parameter and sends the recording parameter to the recording instruction unit 27. Is. The reproduction signal quality determination unit 26 determines whether the number of classifications in the reference table queried by the test recording parameter setting unit 23 is equal to or greater than a predetermined value when the reproduction signal does not satisfy the predetermined reproduction signal quality. This determination is performed. If the number of classifications in the reference table is not equal to or greater than the predetermined value, a trial recording parameter change command for resetting the trial recording parameter is sent to the trial recording parameter setting unit 23 and stored in the storage unit 3. The reference table classification is finely reset. In addition, the reproduction signal quality determination unit 26 displays an error on a display unit (not shown) and displays a recording parameter, assuming that a recording parameter setting error has occurred when the number of classifications in the reference table is equal to or greater than a predetermined value. The setting operation is terminated. The predetermined value here will be described in detail later. The predetermined reproduction signal quality mentioned here is reproduction signal quality within a range that can be sufficiently compensated by the error correction function of the recording / reproducing apparatus (in this embodiment, the optical disc apparatus 1). Also, the value is arbitrarily set in consideration of manufacturing variations of an optical disk (optical disk 2 in the present embodiment). As playback signal quality, jitter, error rate, etc. can be used. When there is a bottom level standard such as jitter, error rate, etc. for each optical disc, the bottom level value defined in the above standard is set to a predetermined level. It can also be used as playback signal quality.

  The recording instruction unit 27 instructs the pickup driving circuit 13 and the laser driving circuit 14 to perform a recording operation on the user area 42 of the optical disc 2 in accordance with the recording parameter sent from the reproduction signal quality determination unit 26.

  Hereinafter, the recording parameter setting operation in the optical disc apparatus 1 will be described with reference to FIGS. FIG. 6 is a flowchart for explaining the operation flow of the recording parameter setting operation in the present embodiment. 7 to 11 are diagrams showing reference tables in the present embodiment.

  First, in step S <b> 1, the recording information acquisition unit 22 acquires recording information to be recorded on the optical disc 2. Subsequently, in step S2, the test recording parameter setting unit 23 makes an inquiry to the storage unit 3 based on the recording information acquired by the recording information acquisition unit 22, and sets the test recording parameter. Specifically, based on the recording information, first, a reference table as shown in FIGS. 7 and 11 is referred to, a recording parameter corresponding to the recording information is obtained, and a test recording parameter is set. FIG. 7 shows a reference table of the trailing edge falling position dTlp, which is a recording pulse parameter, as a reference table for controlling the heat of the trailing edge, which is the position where the formation of the recording mark is completed. In FIG. 7, a reference table is used in which only one type of classification corresponds to a recording mark length of 4T or more. At this time, when the recording mark length of the recording information is less than 4T, the recording parameter set by default is set as the recording parameter, and when the recording mark length of the recording information is 4T or more, A corresponding classification value (b4 in this case) in the reference table is set as a recording parameter. For example, as a default setting, a value of Ttop or dTlp may be set in advance in this case.

  FIG. 11 shows a reference table for the leading rising position dTtop, which is a recording pulse parameter, as a reference table for controlling the heat of the front edge, which is the position where recording marks start to be formed. In FIG. 11, the recording mark lengths are classified into three types of 2T, 3T, 4T or more, and the number of classifications is not changed in the subsequent trial recording. Therefore, the number of recording parameters for controlling the heat of the leading edge does not increase any more.

  As described above, the reference tables of FIGS. 7 and 11 are recorded in the disc setting area 41, and the optical disc apparatus 1 reads the reference table and stores it in the storage unit 3. Thereafter, the trial recording parameter setting unit 23 sets the trial recording parameters with reference to the reference table of the storage unit 3. Here, the same value as 4T, that is, b4, is set in the test recording parameter setting unit 23 for the trailing edge dTlp of the end pulse having a recording mark length (5T or longer) longer than 4T. Further, the same value as 4T, that is, c4 is set in the test recording parameter setting unit 23 for the head rising position dTtop having a mark length longer than 4T (5T or more). Since the trial recording parameter setting unit 23 sets the same value as 4T to 5T or more, the reading time can be shortened compared to reading different recording parameters up to 9T. The trial recording parameter setting unit 23 sets the same recording parameter value from 4T to 9T, and gives the same amount of change during trial recording. That is, the value of the 4T change amount is used as the value of the change amount at the time of common test recording from 4T to 9T.

  In step S3, the pickup drive circuit 13 and the laser drive circuit 14 are configured so that the trial recording instruction unit 24 performs a trial recording operation on the setting area 41 of the optical disc 2 according to the trial recording parameters set by the trial recording parameter setting unit 23. To give instructions. In step S4, the optical head 11 is caused to record information in the setting area of the optical disc 2 according to the test recording parameters by the pickup driving circuit 13 and the laser driving circuit 14. In step S 5, the information is reproduced by the optical head 11, and a reproduction signal is obtained by the reproduction circuit 15.

  In step S 6, the reproduction signal acquisition unit 25 acquires the reproduction signal and sends it to the reproduction signal quality determination unit 26. Subsequently, in step S7, the reproduction signal quality determination unit 26 determines whether or not the reproduction signal acquired by the reproduction signal acquisition unit 25 satisfies a predetermined reproduction signal quality. If the reproduction signal satisfies the predetermined reproduction signal quality (YES in step S7), the process proceeds to step S8. If the reproduction signal does not satisfy the predetermined reproduction signal quality (NO in step S7), the process proceeds to step S9. Specifically, whether or not the reproduction signal satisfies the predetermined reproduction signal quality is determined based on whether or not the jitter satisfies a predetermined value (for example, 6.5% or less) as the predetermined reproduction signal quality.

  In step S 8, the test recording parameters used for the test recording are sent to the recording instruction unit 27 by the reproduction signal quality determination unit 26. That is, a recording parameter for actually performing a recording operation is set (determined) in the user area 42 of the optical disc 2, and the recording parameter setting operation is completed.

  In step S9, the reproduction signal quality determination unit 26 determines whether or not the number of classifications in the reference table queried by the test recording parameter setting unit 23 is greater than or equal to a predetermined value. If the number of classifications in the reference table is equal to or greater than the predetermined value (YES in step S9), the process proceeds to step S10. If the number of classifications in the reference table is not equal to or greater than the predetermined value (NO in step S9), the process proceeds to step S11. The predetermined value will be described below. Specifically, in FIG. 7, the number of reference table classifications is one in FIG. In this embodiment, since the maximum recording mark length is 9T, when 4T to 9T are individually classified, the reference table has a maximum number of classifications of six. Here, when the reproduction signal quality determination unit 26 determines in step S9 that the number of classifications in the reference table inquired by the test recording parameter setting unit 23 is 7, the maximum number of classifications in the reference table in FIG. 7 is six. So contradictory. Therefore, an error has occurred in the recording parameter setting operation. Further, when the reproduction signal quality determination unit 26 determines in step S9 that the number of classifications in the reference table inquired by the test recording parameter setting unit 23 is 6, it is the same as the maximum value of the number of classifications in the reference table in FIG. Therefore, the number of classifications cannot be increased any more, and an error has occurred in the recording parameter setting operation. Therefore, in this embodiment, in order to detect that an error has occurred in the recording parameter setting operation, the maximum value of the number of classifications in the reference table queried by the test recording parameter setting unit 23 is used as the predetermined value. . Note that each time the test recording parameter for the test recording operation is reset, the reference table inquired by the test recording parameter setting unit 23 is also changed. However, the predetermined value changes as the reference table is changed. It fluctuates according to the maximum number of classifications in the reference table.

  In step S10, assuming that an error has occurred in the recording parameter setting operation, the reproduction signal quality determination unit 26 displays the error on a display unit (not shown) and ends the recording parameter setting operation.

  In step S11, a test recording parameter change command for resetting the test recording parameters is sent to the test recording parameter setting unit 23, and the classification of the reference table stored in the storage unit 3 is set in detail. Specifically, the reference table classification that had only one classification for recording mark lengths of 4T or more is classified into two types, 4T and 5T or more, as shown in FIG. The parameter setting unit 23 can be set. Thereby, the test recording can be performed by independently controlling the setting values of the test recording parameters of 4T and 5T or more. Then, the trial recording parameter setting unit 23 that has received the trial recording parameter change command newly queries the storage unit 3 and records according to the recording information among the recording parameters defined in the reference table of FIG. The parameter is obtained, and the test recording parameter used for the test recording operation is reset. At this time, the same value is set from 5T to 9T, and the same amount of change is given during trial recording. That is, the value of 5T is used as a common value up to 9T. Then, after changing the reference table, the process returns to step S2 to repeat the operation flow. Each time the operation flow is repeated after returning to step S2, the classification of the reference table stored in the storage unit 3 is finely reset as described above. Specifically, after the reference table of FIG. 8, a reference table classified into three types of 4T, 5T, and 6T or more as shown in FIG. 9 is used. Next to the reference table of FIG. 9, the reference table is classified in stages, such as using a reference table classified into four types of 4T, 5T, 6T, and 7T or more as shown in FIG. Set it again.

  In the present embodiment, both the reference table for controlling the heat of the front edge and the reference table for controlling the heat of the rear edge stored in the storage unit 3 at the time when the test recording operation is started. 4T or more (predetermined recording mark length or more) is classified as the same, but this is not necessarily limited thereto. For example, among the reference table for controlling the heat of the front edge and the reference table for controlling the heat of the rear edge stored in the storage unit 3 when the test recording operation is started, the heat of the rear edge is selected. It is preferable that the reference table for controlling the above is classified more finely than the reference table for controlling the heat of the front edge.

  Among the reference table for controlling the heat of the front edge and the reference table for controlling the heat of the rear edge, the reference table for controlling the heat of the rear edge is the heat of the front edge. The table may be recorded in the setting area 41 of the optical disc 2 as a table that is classified more finely than the reference table for controlling. In this case, when the reference table is read by the optical disk device 1 and stored (recorded) in the storage unit 3, the heat of the front edge stored in the storage unit 3 is controlled when the test recording operation is started. Of the reference table and the reference table for controlling the heat of the trailing edge, the reference table for controlling the heat of the trailing edge is classified more finely than the reference table for controlling the heat of the leading edge. Will be. That is, the reference table for controlling the heat of the front edge that is equal to or greater than a predetermined recording mark length and the same classification with a mark length longer than the predetermined recording mark length (that is, the predetermined recording mark length and And a reference table for controlling the heat of the rear edge (divided into mark lengths longer than a predetermined recording mark length).

  This makes it possible to finely classify the recording parameters for controlling the heat of the trailing edge of the recording mark as compared with the recording parameters for controlling the heat of the leading edge of the recording mark. The number of recording parameters can be reduced rather than increasing the number of classifications. Also, since the trailing edge of the recording mark is more susceptible to heat than other areas of the recording mark, the point at which the recording mark is finished forming can be classified by subdividing the reference table for controlling the heat of the trailing edge. It is possible to more precisely control the heat of the trailing edge, and to form a recording mark that can compensate for the influence of the accumulated heat and obtain good reproduction quality.

  Further, in the present embodiment, when resetting the test recording parameters, the classification of the reference table stored in the storage unit 3 is set in detail, but the configuration is not necessarily limited thereto. For example, a plurality of reference tables having different classification numbers are stored in the storage unit 3 in advance (for example, all of the reference tables of FIGS. 7, 8, 9 and 10 are stored in the storage unit 3). ) When resetting the test recording parameter, the configuration may be such that the type of the reference table to be referred to by the test recording parameter setting unit 23 is changed.

  For example, when the reference table of recording parameters finally determined for the trailing edge falling position dTlp is the reference table of FIG. 10, the recording parameter dTlp for controlling the heat of the trailing edge of the recording mark is shown in FIG. As described above, the recording mark length 4T or more is classified and set as 4T, 5T, 6T, 7T or more. Further, dTtop, which is a recording parameter for controlling the heat at the front edge of the recording mark, is not reset by trial recording, so that the recording mark length is 2T as shown in FIG. It is set by being classified into three types of 3T, 4T or more.

  In the case where the reference table is recorded in the setting area 41 of the optical disc 2, for example, the recording pulse parameters dTtop and dTlp are recorded according to the recording mark length, and FIG. 16 (a) and FIG. The values of the recording pulse parameters dTtop and dTlp as shown in 16 (b) are recorded in the setting area 41.

  As can be seen from FIGS. 16A and 16B, the recording pulse parameter dTtop is classified and assigned to three regions of 2T, 3T, and 4T or more, while the recording pulse parameter dTlp is 2T, It is classified and assigned to four areas of 3T, 4T, and 5T or more. That is, an area for storing the value of the recording pulse parameter dTtop is allocated according to the recording mark length, and an area for storing a value longer than a predetermined recording mark length (4T or more in FIG. 16A) is one. Assigned to one area. An area for storing the value of the recording pulse parameter dTlp is assigned according to the recording mark length, and a recording mark length longer than the predetermined recording mark length (5T or more in FIG. 16B) is set. The storage area is assigned to one area.

  As described above, even in the case where the reference table is recorded in the setting area 41 of the optical disc 2, the reference table for controlling the rear edge heat to form the rear edge controls the front edge heat. That is, it is classified more finely than the reference table for forming. Therefore, the effect of the present invention can be obtained by reading the reference table from the setting area 41 of the optical disc 2.

  Each value of the reference table recorded in the setting area 41 of the optical disc 2 may be a value recorded by the above-described test writing, or a value recorded as a pre-record at the time of various settings at the time of shipment. Also good.

  Next, the effect in this invention is demonstrated using FIG. FIG. 12 is a diagram showing a correlation between the degree of classification of the reference table and the jitter of the reproduction signal of the recording mark.

  Condition 1 uses the reference table of FIG. 7 (the recording pulse parameter is classified into one for recording mark lengths of 4T or more) as the recording parameter of the trailing edge falling position dTlp. The reference table of FIG. 8 (recording pulse parameters classified into two for recording mark lengths of 4T and 5T or more) was used. Further, as the condition 3, the reference table of FIG. 9 (the recording pulse parameters classified into three for the recording mark lengths of 4T, 5T, and 6T or more) is used, and as the condition 4, the reference table of FIG. (Recording pulse parameters classified into four for recording mark lengths of 4T, 5T, 6T, and 7T or more) were used. For example, when the predetermined reproduction signal quality is a jitter of 6.5% or less, as is apparent from FIG. 12, only the condition 4 satisfies the predetermined reproduction signal quality. That is, if the classification of the recording mark lengths is made too much in order to reduce the number of recording parameters, the predetermined reproduction signal quality cannot be satisfied as in the case of Condition 1, Condition 2, and Condition 3. On the other hand, in the present invention, when the predetermined reproduction signal quality cannot be satisfied with the reference table of condition 1, reference is made to the point where the predetermined reproduction signal quality can be satisfied, such as using the reference table of condition 2. You can reset the table classification finely.

  The predetermined reproduction signal quality is not necessarily limited to a jitter of 6.5% or less. Here, the predetermined reproduction signal quality represents a level at which the reproduction signal can be error-corrected by the optical disc apparatus 1, and is a reproduction signal quality that can secure a margin for variations due to mass production of the optical disc apparatus 1 and the optical disc 2. I just need it. For example, when the predetermined reproduction signal quality is a jitter of 7% or less, as is apparent from FIG. 12, the conditions 2, 3 and 4 satisfy the predetermined reproduction signal quality.

  Next, the effect in this invention is demonstrated using FIG. FIG. 15 uses the reference table of FIG. 8 (recording pulse parameters classified into two for recording mark lengths of 4T and 5T or more) as recording parameters for the trailing edge falling position dTlp. The relative position of dTlp and the recording when the position of dTlp of 5T or more is changed in the forward direction relative to the time axis direction (the direction opposite to the direction of time progression). It is a figure which shows correlation with the jitter of the reproduction signal of a mark. That is, in FIGS. 4 and 5, the time progression direction is from the left to the right in the drawing, and therefore the position of dTlp of 5T or more is changed to the left. Note that the value of dTlp is set as a time based on the falling position of the recording information corresponding to each recording mark length. Here, the clock interval T is about 3.8 ns, and the position of dTlp is shifted (moved) in units of T / 16. As shown in FIG. 15, the position of dTlp of 5T or more with respect to the position of dTlp of 4T, the forward direction in the time axis direction with respect to the falling position of each recording information (the reverse direction to the traveling direction of time) As the jitter is relatively moved, the jitter once becomes good and then gradually deteriorates (specifically, the jitter gradually improves until the relative position “−3”, and after the relative position “−3”). It can be seen that the jitter gradually deteriorates. Note that when changing dTlp, the value of the termination pulse width Tlp is not changed. Therefore, when dTlp is changed, the rising position of Tlp approaches the falling position of the leading pulse width Ttop. At this time, dTlp of 5T or more can be changed in the direction opposite to the time progression direction to a position where the falling position of Ttop and the rising position of Tlp do not overlap.

  The above-described change in jitter is due to the following reason. First, as the recording mark length becomes longer, the intermediate period between the first pulse and the last pulse becomes longer. For this reason, the accumulation of heat increases at the trailing edge of the recording mark. Therefore, by moving the position of dTlp of 5T or more, that is, the long recording mark length in the forward direction, the intermediate period is shortened and the heat accumulation at the trailing edge is reduced, so that the intermediate period is not shortened. , Jitter will be good. However, if the position of dTlp is greatly moved in the forward direction, the intermediate period becomes too short, and the heat for forming the trailing edge of the recording mark is insufficient, and the jitter deteriorates. From the result shown in FIG. 15, the relative position of dTlp of 5T or more with respect to 4TdTlp is between −T / 16 and −5T / 16 (here, the backward direction (time If the traveling direction) is expressed as +), the jitter is 7.0% or less, which is good.

  As described above, it has a reference table defined for recording parameters for controlling heat of at least the trailing edge of the recording mark, and the reference table is classified according to at least the mark length of the recording information, and If the predetermined mark length is equal to or greater than the predetermined mark length, test recording is performed using the test recording parameters set based on the reference table, the test recording is reproduced, and the predetermined reproduction signal quality is not satisfied. The above reference table is further finely classified according to the mark length, test recording is performed, the test recording is reproduced, and a reference table satisfying a predetermined reproduction signal quality is determined. As a result, the number of recording parameters to be used is reduced as much as possible, and the effect of accumulated heat is compensated by controlling the heat of the trailing edge, which is the point where recording marks have been formed, and good reproduction signal quality can be obtained. A recording mark (which satisfies a predetermined reproduction signal quality) can be formed.

  Note that the trailing edge of the recording mark is more susceptible to heat than other areas such as the leading edge of the recording mark, so when forming a recording mark longer than the specified recording mark length, control the heat of the trailing edge. Thus, it is possible to form a recording mark that can obtain a predetermined reproduction signal quality. Therefore, it is possible to form a recording mark that can more reliably obtain a good reproduction signal quality only by setting the recording parameter for controlling the heat of the trailing edge according to the present invention.

  Further, in the configuration using the reference table fixed in advance, when the recording condition of the track of the optical disc 2 changes with time, the reference table cannot be changed frequently according to the change of the recording condition of the track. If the recording conditions of the track change, there is a possibility that it is impossible to form a recording mark that can obtain good reproduction signal quality (satisfying predetermined reproduction signal quality). On the other hand, in the present invention, since the reference table classification is reset according to the result of the trial recording, even if the recording condition of the track of the optical disc 2 changes with time, the track The reference table classification can be reset according to changes in the recording conditions. Therefore, it is possible to form a recording mark that can provide good reproduction signal quality (satisfying predetermined reproduction signal quality) even when the recording condition of the track changes with time.

  Note that the set recording parameter reference table is recorded in the setting area 41 of the optical disc 2, and the optical disk apparatus 1 reads and uses the reference table recorded in the setting area 41 in order to set the recording parameter thereafter. It may be configured to. For example, when the reference table of the recording parameters determined for the trailing edge dTlp of the end pulse is FIG. 10, this information is recorded in the setting area 41 of the optical disc 2. Thereby, the optical disc apparatus 1 can read and use the information of the reference table of FIG. 10 from the setting area 41 in order to set the recording parameter dTlp after the next time.

  In addition, according to the above configuration, the recording parameter reference table set by performing the trial recording in advance can be used as the trial recording parameter at the time of new recording. It is possible to reduce the number of repetitions. Further, since the reference table of the set recording parameters is recorded in the setting area 41 of the optical disc 2, it is not necessary to newly provide a storage device such as a memory.

  In the present embodiment, the recording parameters are used in the form of a table such as a reference table. However, the present invention is not limited to this, and a set of recording parameters may be stored in the storage unit.

  In the present embodiment, the reference table is classified step by step from a short mark length as a method of classification of the reference table, but is not necessarily limited thereto. However, as the recording mark length is shorter, the frequency of occurrence in the data recorded in the user area 42 increases. In the trial recording, it is not necessary to use the data recorded in the user area 42 as it is, and a good reproduction signal is obtained when the recording mark length is classified step by step from the recording mark length by using random data. There is an advantage that quality is easily obtained. Further, if the recording mark lengths are classified step by step from a short recording mark length, it is possible to keep the number of classifications that can satisfy a predetermined reproduction signal quality, so the number of recording parameters in the reference table is predetermined. There is an advantage that it becomes easy to set the reproduction signal quality to a minimum number that can satisfy the reproduction signal quality.

  In this embodiment, the recording mark length is used as the recording information classified by the reference table. However, the present invention is not limited to this. For example, the recording mark length and the space length may be classified by the reference table as recording information. In this case, by changing only the recording mark length classification and not changing the classification for the space length, the number of recording parameters can be reduced as in the present embodiment.

  In the present embodiment, the end pulse falling position dTlp is described as an example of the reference table. However, the reference table is based on Tlp indicating the width of the end pulse or the cooling end position dTe at which the cooling period ends. Even if is used, since the heat of the trailing edge of the recording mark can be controlled, the same effect can be obtained. In addition to the pulse train shown in FIG. 5 in which two pulses of a leading pulse and a trailing pulse are generated when the recording mark length is 4T or more, by making the intermediate power Pm and the recording power Pw the same. There are also a pulse train shown in FIG. 13 in which the recording mark is composed of one recording pulse, a pulse train shown in FIG. 14 in which the recording power Pw and the intermediate power Pm of the terminal pulse are made the same. In the case of FIG. 13 and FIG. 14, there is no Tlp indicating the width of the terminal pulse, so the trailing edge dTlp of the terminal pulse shown in FIGS. 13 and 14 may be used. That is, when a recording medium that generates a pulse train as shown in FIGS. 13 and 14 is used, a reference table based on the trailing edge dTlp of the terminal pulse may be used. At this time, in FIG. 13, when dTlp is changed, the time can be changed in the direction opposite to the time progression direction to the position where the position of dTtop does not overlap with the position of dTlp. In FIG. 14, when dTlp is changed, it can be changed in the direction opposite to the time progression direction to a position where the falling position of Ttop does not overlap with the position of dTlp.

  In this embodiment, the leading edge position dTtop is used as a recording parameter for controlling the heat of the front edge. However, the present invention is not limited to this, and the width Ttop of the leading pulse may be used as a recording parameter.

  In this embodiment, the recording parameter for controlling the heat of the front edge is not reset by trial recording, but this is not necessarily limited thereto. For example, in addition to the recording parameter for controlling the heat of the trailing edge, the recording parameter for controlling the heat of the leading edge may be reset by trial recording. In this case, the recording parameters for controlling the heat of the front edge may be reset in the same manner as the recording parameters for controlling the heat of the trailing edge.

  In the present embodiment, the recording parameter group for controlling the heat of the front edge is classified into the same classification for a predetermined recording mark length or longer (first process), and the heat of the rear edge is controlled. The recording parameter group is classified according to at least the recording mark length of the recording information, and is more finely classified than the recording parameter for controlling the heat of the front edge above the predetermined recording mark length. Although both steps (second step) are performed in the recording parameter setting unit 21, a configuration may be adopted in which separate steps corresponding to the respective steps (first and second steps) are performed.

  In the present embodiment, in the reference table used for the trial recording first, the recording mark length of 4T or more is classified into the same classification. However, the present invention is not limited to this. A numerical value may be taken. Here, the length exceeding the specified recording mark length is assumed that the trailing edge is not affected by the heat storage at the leading edge of the recording mark, that is, the trailing edge recording parameter is controlled independently of the leading edge recording parameter. The recording mark length is longer than the recording mark length expected to be possible, and is arbitrarily set according to the type of the information recording medium (in this embodiment, the optical disc 2).

  In the present embodiment, the case where jitter is used for evaluation of the reproduction signal quality of the test recording has been described as an example, but the present invention is not necessarily limited thereto. For example, an error rate or the like may be used for evaluating the reproduction signal quality, and any index may be used as long as it is an index used for evaluating the reproduction signal quality for trial recording.

  In the present embodiment, the (1, 7) RLL code is used as the run length limit code with d = 1. However, the present invention is not limited to this, and other modulation schemes and other codes may be used.

  In the present embodiment, the optical modulation recording optical disc apparatus 1 is used. However, the present invention is not limited to this, and the optical magnetic field modulation recording optical disc apparatus can be used similarly. Furthermore, in the present embodiment, the optical disc apparatus 1 is used as an example of a recording / reproducing apparatus, but the present invention is not necessarily limited thereto. For example, any device that records information by heating the information recording medium to change the physical characteristics of the information recording medium may be used, and the magnetic recording device, the magneto-optical disk device, and the like may be used in the same manner as the optical disk device 1. Can do.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims, and the technical means disclosed in different embodiments can be appropriately combined. Such embodiments are also included in the technical scope of the present invention.

  The present invention is a recording parameter setting apparatus for setting a recording parameter for forming a recording mark on an information recording medium according to recording information, and classified according to at least the recording mark length of the recording information. A recording parameter group for controlling the heat of the trailing edge, which is an area where the formation of the recording mark is completed, of at least the recording mark is stored in the same classification for a predetermined recording mark length or longer. A test recording parameter setting means for setting a test recording parameter for performing test recording, and reproducing a test recording performed in accordance with the test recording parameter. If the playback signal to be recorded does not satisfy the predetermined playback signal quality, the recording parameter group has a classification greater than or equal to the predetermined recording mark length. A recording parameter setting device comprising: a reproduction signal quality determining means for setting a test recording parameter as the recording parameter when the reproduction signal satisfies a predetermined reproduction signal quality after further reclassifying and performing the trial recording again. It can also be expressed as

  According to the above invention, since the recording parameter group for controlling the heat of at least the trailing edge of the recording mark is classified into the same classification for a predetermined recording mark length or more, the recording parameter group is divided into all the recording mark lengths. The total number of recording parameters can be reduced as compared with the case of different classification for each.

  The above classification is a group according to the recording mark length, and specifically, a common value or a common change amount with respect to the recording parameters corresponding to the recording mark lengths collected in one group. Say that is given.

  In the above invention, the trial recording parameter for trial recording is set by the trial recording parameter setting means based on the recording information, and the reproduction signal obtained by reproducing the trial recording performed according to the trial recording parameter is reproduced. The signal quality judging means judges whether or not a predetermined reproduction signal quality is satisfied. If the reproduction signal quality does not satisfy the predetermined reproduction signal quality, the reproduction signal quality judging means classifies the classification of the recording parameter group equal to or longer than the predetermined recording mark length more finely according to the recording mark length, and performs test recording again. If the playback signal satisfies the predetermined playback signal quality, the test recording parameter is set as the recording parameter. Therefore, the recording parameter satisfying the predetermined playback signal quality is increased while increasing the number of classifications of the recording parameter group. It will be decided. Accordingly, it is possible to further reduce the number of recording parameter group classifications when recording parameters satisfying a predetermined reproduction signal quality are determined. In addition, the recording parameters for controlling the heat of the trailing edge, which is more susceptible to heat than other areas of the recording mark, are determined so as to satisfy the predetermined reproduction signal quality, so that they are stored at the trailing edge. It is possible to form a recording mark that can compensate for the influence of the heat and obtain good reproduction signal quality.

  As a result, it is possible to form a recording mark that can more reliably obtain a good reproduction signal quality while suppressing the number of recording parameters to be used.

  Each unit in the recording parameter setting apparatus can be executed on a computer by a program. Furthermore, the program can be executed on an arbitrary computer by storing the program in a computer-readable recording medium.

  In the recording parameter setting device having the above-described configuration, the reproduction signal quality determination unit determines that the classification of the recording parameter group is not less than a predetermined recording mark length when the reproduction signal does not satisfy a predetermined reproduction signal quality. It is preferable to reclassify into the recording mark length and other recording mark lengths.

  As a result, the recording parameter satisfying the predetermined reproduction signal quality is determined while increasing the number of classifications of the recording parameter group one by one. Therefore, the classification number of the recording parameter group when the recording parameter satisfying the predetermined reproduction signal quality is determined is the number of classifications of the recording parameter group from which the recording parameter satisfying the predetermined reproduction signal quality can be obtained more reliably. It becomes the minimum value. Therefore, it is possible to form a recording mark that can more reliably obtain a good reproduction signal quality while suppressing the number of recording parameters to be used to a minimum value.

  In the recording parameter setting device having the above-described configuration, it is preferable that the recording parameter is a trailing end position of a pulse train of the recording mark.

  As a result, it is possible to form a recording mark capable of more reliably obtaining a good reproduction signal quality while suppressing the number of recording parameters to be used by using the trailing end position of the pulse train of the recording mark as a recording parameter.

  In the recording parameter setting device having the above-described configuration, it is preferable that the recording parameter is a width of a terminal pulse of a pulse train of the recording mark.

  As a result, it is possible to form a recording mark capable of more reliably obtaining a good reproduction signal quality while suppressing the number of recording parameters to be used by using the width of the end pulse of the pulse train of the recording mark as a recording parameter.

  The present invention also provides a recording parameter setting device for setting recording parameters for forming recording marks on an information recording medium according to recording information, wherein the recording parameters are classified according to at least the recording mark length of the recording information. And a recording parameter group for controlling the heat of the front edge of the recording mark, and at least the recording mark length of the recording information, which are classified into the same classification over a predetermined recording mark length. The heat of the trailing edge of the recording mark is controlled more finely than the recording parameters for controlling the heat of the front edge above the predetermined recording mark length. It can also be expressed as a recording parameter setting device in which the recording parameters are composed of a recording parameter group for the purpose.

  As a result, the recording parameter group for controlling the heat of the trailing edge of the recording mark can be finely classified as compared with the recording parameter group for controlling the heat of the leading edge of the recording mark. The total number of recording parameters can be reduced compared to the case where the number of classifications of both the recording parameter group for controlling the recording parameter and the recording parameter group for controlling the heat of the trailing edge is increased. Further, since the trailing edge of the recording mark is more susceptible to heat than other areas of the recording mark, the recording mark is finished by finely classifying the recording parameter group for controlling the heat of the trailing edge. It is possible to more precisely control the heat of the trailing edge, which is a point, and to form a recording mark that can compensate for the influence of the accumulated heat and obtain good reproduction quality.

  As a result, it is possible to form a recording mark that can more reliably obtain a good reproduction signal quality while suppressing the number of recording parameters to be used.

  In the recording parameter setting apparatus having the above-described configuration, it is preferable that the recording parameter for controlling the heat of the trailing edge of the recording mark is a trailing end position of the pulse train of the recording mark.

  As a result, the recording mark pulse train end-falling position can be used as a recording parameter for controlling the heat of the trailing edge. Can be formed.

  In the recording parameter setting apparatus having the above configuration, it is preferable that the recording parameter for controlling the heat of the trailing edge of the recording mark is the width of the end pulse of the pulse train of the recording mark.

  As a result, the width of the end pulse of the pulse train of the recording mark can be used as a recording parameter for controlling the heat of the trailing edge. Can be formed.

  In the recording parameter setting apparatus having the above configuration, it is preferable that the recording parameter for controlling the heat of the trailing edge of the recording mark is a cooling end position at which the cooling period of the pulse train of the recording mark ends.

  As a result, the cooling end position at the end of the cooling period of the pulse train of the recording mark is used as a recording parameter for controlling the heat of the trailing edge, while the number of recording parameters to be used is suppressed, and a better reproduction signal quality is ensured. The resulting recording mark can be formed.

  In the recording parameter setting device having the above-described configuration, it is preferable that the recording parameter for controlling the heat of the front edge of the recording mark is a leading rising position of the pulse train of the recording mark.

  As a result, the recording mark for obtaining a good reproduction signal quality can be obtained more reliably while suppressing the number of recording parameters to be used as a recording parameter for controlling the heat at the trailing edge of the leading edge position of the pulse train of the recording mark. It becomes possible to form.

  In the recording parameter setting apparatus having the above configuration, it is preferable that the recording parameter for controlling the heat of the front edge of the recording mark is the width of the leading pulse of the pulse train of the recording mark.

  As a result, the width of the first pulse of the pulse train of the recording mark can be used as a recording parameter for controlling the heat of the leading edge. Can be formed.

  Further, the recording parameter setting device having the above-described configuration is configured to classify the predetermined recording mark length and the predetermined recording mark length into a classification equal to or greater than a predetermined recording mark length of the recording parameter group for controlling the heat of the trailing edge of the recording marks. It is preferable to classify the recording mark lengths other than.

  As a result, the number of classification of the recording parameter group for controlling the heat of the trailing edge of the recording mark is made smaller by one than the number of classification of the recording parameter group for controlling the heat of the leading edge of the recording mark. It will be. Therefore, it is possible to form a recording mark that can more reliably obtain a good reproduction signal quality while minimizing the number of recording parameters to be used.

  In the recording parameter setting device having the above configuration, the predetermined recording mark length and the predetermined recording mark length of the recording parameter group for controlling the heat of the trailing edge of the recording marks are classified into the predetermined recording mark length and the predetermined recording mark length. It is preferable that the recording parameters of the recording marks other than the predetermined recording mark length are set to different values with respect to the recording parameters of the predetermined recording mark length.

  Thereby, since the recording parameters of the recording mark length other than the predetermined recording mark length are set to different values with respect to the recording parameters of the predetermined recording mark length, the recording mark lengths other than the predetermined recording mark length are increased as the jitter is deteriorated. Even when it becomes longer, it is possible to set the recording parameters of recording marks other than the predetermined recording mark length so as to reduce the accumulation of heat at the trailing edge independently of the recording parameters of the predetermined recording mark length. Become. Therefore, it is possible to form a recording mark that can more reliably obtain a good reproduction signal quality while minimizing the number of recording parameters to be used.

  In the recording parameter setting device having the above-described configuration, the recording parameter for controlling the heat of the trailing edge of the recording mark is the trailing edge falling position of the pulse train of the recording mark, and other than the predetermined recording mark length With respect to the trailing end position of the pulse train having the recording mark length, the trailing end position of the pulse train having the predetermined recording mark length is defined in the time axis direction with reference to the trailing position of the recording information corresponding to each recording mark length. It is preferable that the setting is made by relatively shifting in the reverse direction with respect to the traveling direction of time.

  This makes it possible to reduce the accumulation of heat at the trailing edge of the recording mark, which increases as the intermediate period between the leading pulse and the ending pulse becomes longer as the recording mark length becomes longer. That is, by shifting the trailing end position of the pulse train having a recording mark length other than the predetermined recording mark length longer than the predetermined recording mark length, in the opposite direction with respect to the time traveling direction in the time axis direction, the intermediate period It is possible to reduce the accumulation of heat at the trailing edge by shortening, and to improve the jitter.

  In the recording parameter setting apparatus having the above-described configuration, the predetermined recording mark length is preferably 4T or more.

  As a result, it is expected that the trailing edge will not be affected by the heat storage at the leading edge of the recording mark, that is, the recording mark length that is expected to be controllable independently of the recording parameter of the leading edge. The mark length can be set so as to reduce the accumulation of heat at the trailing edge. Therefore, it is possible to form a recording mark that can more reliably obtain a good reproduction signal quality while minimizing the number of recording parameters to be used.

  The present invention can also be expressed as an information recording medium in which recording parameters set by any one of the recording parameter setting devices are recorded in a predetermined area.

  According to the above-described information recording medium, it is possible to form a recording mark that can more reliably obtain a good reproduction signal quality while suppressing the number of recording parameters to be used.

  Further, the present invention is an information recording medium in which a recording parameter for forming a recording mark according to recording information is recorded in a predetermined area, and the recording parameter is set to at least a recording mark length of the recording information. And a recording parameter group for controlling the heat of the front edge of the recording marks that are classified according to and equal to or greater than a predetermined recording mark length, and at least the recording mark length of the recording information And a recording parameter group for controlling the heat of the trailing edge of the recording marks that are classified according to the recording mark length longer than the predetermined recording mark length. It can also be expressed as a recording medium.

  According to the above information recording medium, the recording parameter group for controlling the heat of at least the front edge of the recording mark is classified into the same classification for a predetermined recording mark length or more, and for controlling the heat of the rear edge. Since the recording parameter group has the same classification when the recording mark length is longer than the predetermined recording mark length, the total number of recording parameters is smaller than when the recording parameter group is classified differently for every recording mark length. Can be reduced.

  Further, the recording parameter group for controlling the heat of the trailing edge of the recording mark can be classified more finely than the recording parameter group for controlling the heat of the leading edge of the recording mark. The total number of recording parameters can be suppressed to be smaller than the number of classifications of both the recording parameter group for controlling the heat of the edge and the recording parameter group for controlling the heat of the trailing edge.

  As a result, it is possible to form a recording mark that can more reliably obtain a good reproduction signal quality while suppressing the number of recording parameters to be used.

  The present invention can also be expressed as a recording / reproducing apparatus including an optical pickup for recording / reproducing information on an information recording medium and any one of the recording parameter setting apparatuses described above.

  According to the recording / reproducing apparatus described above, it is possible to form a recording mark that can more reliably obtain a good reproduction signal quality while suppressing the number of recording parameters to be used.

  The present invention is a recording parameter setting method for setting a recording parameter for forming a recording mark on an information recording medium according to recording information, and is classified according to at least the recording mark length of the recording information. And a storage storing a group of recording parameters for controlling the heat of the trailing edge, which is at least the region where the recording marks have been formed, which are classified into the same classification for a predetermined recording mark length or longer. A test recording parameter setting step for setting a test recording parameter for performing test recording by making an inquiry to the recording unit based on the recording information, and reproduction obtained by reproducing the test recording performed according to the test recording parameter If the signal does not satisfy the predetermined reproduction signal quality, the recording parameter group is further classified into a predetermined recording mark length or more. As a recording parameter setting method including a reproduction signal quality determination step for setting a test recording parameter as the recording parameter when the reproduction signal satisfies the predetermined reproduction signal quality after reclassifying and performing the test recording again. Can also be expressed.

  According to the above recording parameter setting method, it is possible to form a recording mark that can more surely obtain a good reproduction signal quality while suppressing the number of recording parameters to be used.

  The present invention also provides a recording parameter setting method for setting recording parameters for forming a recording mark on an information recording medium in accordance with recording information, for controlling the heat of the front edge of the recording mark. The recording parameter group is classified according to at least the recording mark length of the recording information, and the recording parameter group is classified into the same classification for a predetermined recording mark length or longer, and after the recording mark The recording parameter group for controlling the heat of the edge is classified according to at least the recording mark length of the recording information, and the recording parameter for controlling the heat of the front edge at the predetermined recording mark length or more. It can also be expressed as a recording parameter setting method including a second recording parameter group classification step for further finely classifying.

  According to the above recording parameter setting method, it is possible to form a recording mark that can more reliably obtain a good reproduction signal quality, while suppressing the number of recording parameters to be used.

  Finally, in each unit and each processing step of the recording parameter setting unit 21 of the above embodiment, a calculation unit such as a CPU executes a program stored in a storage unit such as a ROM (Read Only Memory) or a RAM, and a keyboard or the like. This can be realized by controlling the input means, the output means such as a display, or the communication means such as an interface circuit. Therefore, various functions and various processes of the recording parameter setting unit 21 of the present embodiment can be realized simply by a computer having these means reading the recording medium storing the program and executing the program. In addition, by recording the program on a removable recording medium, the various functions and various processes described above can be realized on an arbitrary computer.

  As this recording medium, a program medium such as a memory (not shown) such as a ROM may be used for processing by the microcomputer, or a program reader is provided as an external storage device (not shown). It may be a program medium that can be read by inserting a recording medium therein.

  In any case, the stored program is preferably configured to be accessed and executed by the microprocessor. Furthermore, it is preferable that the program is read out, and the read program is downloaded to a program storage area of the microcomputer and the program is executed. It is assumed that this download program is stored in advance in the main unit.

  The program medium is a recording medium configured to be separable from the main body, such as a tape system such as a magnetic tape or a cassette tape, a magnetic disk such as a flexible disk or a hard disk, or a disk such as a CD / MO / MD / DVD. Fixed disk system, card system such as IC card (including memory card), or semiconductor memory such as mask ROM, EPROM (Erasable Programmable Read Only Memory), EEPROM (Electrically Erasable Programmable Read Only Memory), flash ROM, etc. In particular, there are recording media that carry programs.

  In addition, if the system configuration is capable of connecting to a communication network including the Internet, the recording medium is preferably a recording medium that fluidly carries the program so as to download the program from the communication network.

  Further, when the program is downloaded from the communication network as described above, it is preferable that the download program is stored in the main device in advance or installed from another recording medium.

  As described above, the present invention makes it possible to form a recording mark that can more reliably obtain a good reproduction signal quality while suppressing the number of recording parameters to be used. Therefore, the present invention can be suitably used in an industrial field using an information recording medium such as an optical disk or a magneto-optical disk, particularly an industrial field using an information recording medium capable of high-speed recording.

It is a functional block diagram which shows one Embodiment of the control part of the optical disk apparatus in this invention. It is a block diagram which shows one Embodiment of the said optical disk apparatus. It is a perspective view which shows the optical disk in which information is recorded by the said optical disk apparatus. It is a timing chart explaining the setting of the pulse train corresponding to recording information. It is a timing chart explaining the pulse train and recording pulse parameters for forming the recording mark of 2T mark length to 9T mark length. It is a flowchart explaining the operation | movement flow of the setting operation of the recording parameter in this invention. It is a figure which shows one Embodiment of the reference table in this invention. It is a figure which shows one Embodiment of the reference table in this invention. It is a figure which shows one Embodiment of the reference table in this invention. It is a figure which shows one Embodiment of the reference table in this invention. It is a figure which shows one Embodiment of the reference table in this invention. It is a figure which shows the change of the jitter with respect to the conditions of a recording parameter. It is a timing chart explaining an example of a pulse train and a recording pulse parameter for forming a recording mark of 2T mark length to 9T mark length. It is a timing chart explaining an example of a pulse train and a recording pulse parameter for forming a recording mark of 2T mark length to 9T mark length. It is a figure which shows the change of the jitter with respect to the conditions of the recording parameter in this invention. (A) And (b) is a figure which shows an example of the reference table recorded on the optical disk in this invention. It is a figure which shows the reference table which concerns on a prior art. It is a figure which shows the reference table which concerns on a prior art.

Explanation of symbols

1 Optical disk device (recording / reproducing device)
2 Optical disc (information recording medium)
3 Storage Unit 10 Recording / Reproducing Circuit Group 11 Optical Head (Optical Pickup)
DESCRIPTION OF SYMBOLS 12 Pickup 13 Pickup drive circuit 14 Laser drive circuit 15 Reproduction circuit 20 Control part 21 Recording parameter setting part (Recording parameter setting apparatus)
22 Recording information acquisition unit 23 Trial recording parameter setting unit (trial recording parameter setting means)
24 trial recording instruction unit 25 reproduction signal acquisition unit 26 reproduction signal quality determination unit (reproduction signal quality determination means)
27 Recording instruction section 41 Setting area 42 User area

Claims (13)

A recording parameter setting device for setting a recording parameter of a pulse train for forming a recording mark on the information recording medium,
A pulse train for forming each recording mark from the first predetermined recording mark length to the maximum recording mark length includes a leading portion including a leading pulse, a trailing portion including a trailing pulse and a cooling period, the leading portion and the above Including an intermediate part composed of an intermediate period that is a period between the terminal part and
The pulse train for forming each recording mark from the recording mark length shorter than the first predetermined recording mark length to the minimum recording mark length includes a leading portion including a leading pulse, a trailing pulse, and a cooling period. A terminal portion, and
To obtain a record parameters from the first reference table and a second lookup table will be described later, a recording parameter setting means for setting the recording parameter,
(First reference table) In order to control the heat of the front edge of the recording marks, the recording mark lengths which are not less than the first predetermined recording mark length and not more than the maximum recording mark length are set to a common value. A table to store the recording parameters of
(Second reference table) A value is set for each recording mark length that is greater than or equal to the first predetermined recording mark length and less than the second predetermined recording mark length, and is greater than or equal to the second predetermined recording mark length. A table for storing recording parameters at the end portion for controlling the heat of the trailing edge of the recording marks, which is set to a common value for the recording mark length equal to or shorter than the recording mark length ;
The recording parameter setting device, wherein the second predetermined recording mark length is a recording mark length longer than the first predetermined recording mark length. The recording parameters of the terminal end, the the first predetermined recording mark length or more, the claims and sets to the said first predetermined recording mark length and recording mark length than said first predetermined recording mark length The recording parameter setting device according to 1. The recording parameter of the end part is the falling position of the end pulse,
Falling position of the last pulse, the the first predetermined recording mark length or more is claimed, characterized in that the set and the first predetermined recording mark length and recording mark length than said first predetermined recording mark length Item 2. The recording parameter setting device according to Item 1. Falling position of the last pulse, the the first predetermined recording mark length or more is set to the said first predetermined recording mark length and recording mark length than said first predetermined recording mark length, the first predetermined recording 4. The falling position of a terminal pulse having a recording mark length other than the mark length is set to a different value with respect to the falling position of the terminal pulse having the first predetermined recording mark length. Recording parameter setting device.   The falling position of the terminal pulse other than the first predetermined recording mark length is opposite to the time traveling direction in the time axis direction with respect to the falling position of the terminal pulse of the first predetermined recording mark length, 5. The recording parameter setting device according to claim 4, wherein the recording parameter setting device is set so as to be relatively shifted. The recording parameter of the end part is the falling position of the end pulse,
2. The recording parameter setting apparatus according to claim 1, wherein when the falling position of the end pulse is moved, the width of the end pulse is not changed.   7. The recording parameter setting apparatus according to claim 6, wherein the moving direction of the trailing edge of the terminal pulse is a direction in which the terminal pulse is brought closer to the head pulse.   The recording parameter setting device according to claim 1, wherein the recording parameter of the end portion further includes a cooling start position at which the cooling period starts.   9. The recording parameter according to claim 1, wherein the recording parameter of the end portion further includes a cooling end position at which a cooling period of a pulse train for forming the recording mark ends. Setting device.   The recording parameter setting device according to claim 1, wherein the recording parameter of the end portion includes a rising position of the head pulse.   The recording parameter setting apparatus according to claim 1, wherein the recording parameter of the end portion includes a width of the head pulse.   12. The recording parameter setting apparatus according to claim 1, wherein the first predetermined recording mark length is 4T or more. An information recording medium in which the recording parameters set by the recording parameter setting device according to claim 1 are recorded in a predetermined area.

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