JP4156503B2 - Optical recording pulse condition setting method, optical modulation recording / reproducing apparatus, control program, and recording medium - Google Patents

Description

  The present invention reads the recording pulse standard condition from a writable optical recording medium in which the recording pulse standard condition is recorded or from an optical modulation recording / reproducing apparatus in which the recording pulse standard condition is recorded. An optical recording pulse condition setting method for performing optical modulation recording on the basis of a recording pulse corresponding to recording information and reproducing the recorded information after obtaining an optimum recording pulse condition by correcting standard conditions, and optical modulation recording The present invention relates to a playback device, a control program, and a recording medium.

  As an optical disk device for recording a large amount of data, recordable DVDs such as DVDRAM, DVD-RW, and DVD-R have been developed and are generally sold. In these optical disc apparatuses, a pulse train that changes in accordance with recorded information is converted into a pulse train that is finer than the minimum unit of information, the laser beam is intensity-modulated by the fine pulse train, and the intensity-modulated laser beam is applied to the medium. It is recorded by changing the physical characteristics of the medium by condensing and heating. Here, recording condition setting information for performing recording compensation such as a pulse width necessary for recording and the power of each laser beam is stored in advance on the optical disc as a recording pulse standard condition. Alternatively, it is stored on the optical disk device side.

  By the way, as the density of the optical disk increases, strict setting is required such that the recording pulse standard condition is set for each mark length or each combination of mark and space.

  However, when an optical disc recording / reproducing apparatus is mass-produced, individual apparatuses do not always have the same characteristics due to variations in the characteristics of components used and environmental changes. Similarly, optical disks themselves vary in characteristics during mass production, and even if recording is performed under the same recording conditions, the same mark shape is not always obtained on each optical disk. Therefore, even if a standard disc having standard characteristics is used and the recording pulse standard conditions determined by the standard device having standard characteristics are used, mass-produced optical discs and devices having different characteristics are used as they are. However, depending on the combination, proper recording / reproduction is not performed, and there is a problem in that quality defects occur.

As a solution to this problem, Patent Document 1 discloses a method for obtaining a recording pulse condition obtained by correcting a recording pulse standard condition. In this method, in an optical disc in which recording pulse standard conditions are recorded in advance in a specific area, position information for all or one of the combinations of space length and mark length among the recording pulse standard conditions is stored. A value corrected from the recording pulse standard condition is set as the recording pulse condition of the recording / reproducing apparatus so that the jitter of the recording / reproducing signal is equal to or less than the allowable value by changing the quantity quantitatively.
Japanese Patent Laid-Open No. 2000-200408 (published July 18, 2000)

  By the way, in the conventional optical recording pulse condition setting method, as a technique, a predetermined amount of change is uniformly applied to all combinations of the space length and the mark length among the recording pulse standard conditions.

  However, if the mark formation characteristics differ depending on the recording conditions for each recording mark length, even if a predetermined amount of change is applied uniformly, a good recording mark may not be formed for all recording mark lengths. Has a point.

  Japanese Patent Laid-Open No. 2004-228688 also describes a method of giving a predetermined amount of change to any one of the combinations of the space length and the mark length as another method. Even in such a case, since only a part of the recording marks can be improved, there is a problem that a great improvement cannot be expected in the reproduction signal quality in the whole recording marks and spaces.

  Further, only the condition for the pulse width is optimized, but the condition for the recording power is not optimized.

  The present invention has been made in view of the above-described conventional problems, and an object thereof is an optical recording pulse condition setting method capable of reducing the influence of variation in characteristics of a writable optical recording medium and an optical modulation recording / reproducing apparatus, An object of the present invention is to provide an optical modulation recording / reproducing apparatus, a control program, and a recording medium.

  In order to solve the above problems, an optical recording pulse condition setting method for an optical modulation recording / reproducing apparatus according to the present invention performs light modulation recording based on a recording pulse corresponding to recording information and reproduces recorded information. In the optical recording pulse condition setting method of the modulation recording / reproducing apparatus, the recording pulse condition for the shortest recording mark is changed, the trial writing is performed on the optical recording medium, the trial writing is reproduced, and the recording pulse that improves the reproduction signal quality. It is characterized by selecting conditions.

  In order to solve the above problems, an optical modulation recording / reproducing apparatus of the present invention is an optical modulation recording / reproducing apparatus that performs optical modulation recording based on a recording pulse corresponding to recording information and reproduces recorded information. Recording pulse trial writing means for performing trial writing on the optical recording medium by changing the recording pulse condition for the shortest recording mark, and reproduction signal for reproducing the test writing by the recording pulse trial writing means and detecting the reproduction signal quality It is characterized by comprising quality detection means and selection means for selecting a recording pulse condition that improves the quality of the reproduction signal.

  According to the above invention, the recording pulse trial writing means performs trial writing on the optical recording medium by changing the recording pulse condition for the shortest recording mark. The reproduction signal quality detection means reproduces the trial writing by the recording pulse trial writing means and detects the reproduction signal quality. Further, the selection means selects a recording pulse condition that improves the reproduction signal quality.

  By the way, conventionally, when the mark formation characteristics with respect to the recording conditions differ for each recording mark length, even if a predetermined amount of change is applied uniformly, good recording marks are not always formed at all recording mark lengths. Had the problem of not.

  However, in the present invention, when a recording pulse condition that improves the reproduction signal quality is selected, the recording pulse condition for the shortest recording mark is changed.

  That is, the shorter the mark length, the smaller the number of parameters to be changed in the recording pulse condition, and the more difficult it is to set the recording pulse condition for forming a recording mark with good reproduction signal quality. In addition, as the mark length is shorter, the appearance frequency increases in the data. Therefore, the shorter the mark length, the higher the influence on the entire mark, and the more precise the setting, so the better the recording pulse conditions for the shortest mark length, the better the overall reproduction signal quality. large.

  As a result, if the recording pulse condition that improves the reproduction signal quality is selected for the shortest recording mark, the influence of variations in the characteristics of the writable optical recording medium and the optical modulation recording / reproducing apparatus is reduced with respect to the entire reproduction signal quality. can do.

  Further, conventionally, with respect to the method of giving a predetermined amount of change to any one of the combinations of the space length and the mark length, only a part of the recording marks can be improved even with the same mark length. However, in the present invention, since the reproduction signal quality is considered for all the recording marks, there is a problem that the reproduction signal quality in the recording marks and spaces of the recording medium cannot be expected to be greatly improved. No problem.

  The optical recording pulse condition setting method of the optical modulation recording / reproducing apparatus of the present invention performs optical modulation recording based on a recording pulse corresponding to the recording information and reproduces the recorded information in order to solve the above problem. In the optical recording pulse condition setting method of the optical modulation recording / reproducing apparatus to perform, after performing trial writing by uniformly changing the recording power condition for all the recording marks, and determining the recording power condition for obtaining good reproduction signal quality, The recording pulse condition for the shortest recording mark is changed, test writing is performed on the optical recording medium, the test writing is reproduced, and the recording pulse condition that improves the reproduction signal quality is selected.

  In order to solve the above problems, an optical modulation recording / reproducing apparatus of the present invention is an optical modulation recording / reproducing apparatus that performs optical modulation recording based on a recording pulse corresponding to recording information and reproduces recorded information. Recording power test writing means for performing test writing by uniformly changing the recording power conditions for all recording marks, recording power determination means for reproducing test writing by the recording power test writing means, and determining recording power conditions; By using the recording power determined by the recording power determination means, the recording pulse condition for the shortest recording mark is changed, and the recording pulse trial writing means for performing trial writing on the optical recording medium, and the recording pulse trial writing means Playback signal quality detection means for playing back test writing and detecting playback signal quality, and selection to select recording pulse conditions that improve playback signal quality It is characterized in that it comprises a stage.

  According to the above invention, the recording power trial writing means performs the trial writing by uniformly changing the recording power conditions for all the recording marks, the recording power determination means reproduces the trial writing by the recording power trial writing means, and the recording Determine power conditions. Further, the recording pulse trial writing means changes the recording pulse condition for the shortest recording mark in the recording pulse standard condition using the recording power determined by the recording power determination means, and performs trial writing on the optical disc. Further, the reproduction signal quality detection means reproduces the test writing by the recording pulse trial writing means, detects the reproduction signal quality, and the selection means selects a recording pulse condition that improves the reproduction signal quality.

  Therefore, in the present invention, the recording power condition is first determined, and then the recording pulse condition that improves the reproduction signal quality is selected.

  As a result, it is possible to optimize the conditions for the recording power. Further, it is possible to select a recording pulse condition that improves the reproduction signal quality while the recording power condition is fixed.

  The optical recording pulse condition setting method of the optical modulation recording / reproducing apparatus of the present invention performs optical modulation recording based on a recording pulse corresponding to the recording information and reproduces the recorded information in order to solve the above problem. In the optical recording pulse condition setting method of the optical modulation recording / reproducing apparatus to be performed, the recording pulse condition for the shortest recording mark is changed, the trial writing is performed on the optical recording medium, the trial writing is reproduced, and the reproduction signal quality is improved. After selecting the recording pulse condition, trial writing is performed by uniformly changing the recording power condition for all the recording marks, and the recording power condition for obtaining good reproduction signal quality is determined.

  In order to solve the above problems, an optical modulation recording / reproducing apparatus of the present invention is an optical modulation recording / reproducing apparatus that performs optical modulation recording based on a recording pulse corresponding to recording information and reproduces recorded information. Recording pulse trial writing means for performing trial writing on the optical recording medium by changing the recording pulse condition for the shortest recording mark, and reproduction signal for reproducing the test writing by the recording pulse trial writing means and detecting the reproduction signal quality After selecting the quality detection means, the selection means for selecting the recording pulse condition for improving the reproduction signal quality, and the recording pulse condition for improving the reproduction signal quality, the recording power condition for all the recording marks is changed and tested. A recording power test writing means for performing writing, a recording power determination means for reproducing the test writing by the recording power test writing means, and determining the recording power; It is characterized in that it comprises.

  According to the above invention, the recording pulse trial writing means changes the recording pulse condition for the shortest recording mark in the recording pulse standard condition, performs trial writing on the optical disc, and the reproduction signal quality detection means performs the recording pulse trial. The test writing by the writing means is reproduced, the reproduction signal quality is detected, and the selection means selects a recording pulse condition that improves the reproduction signal quality.

  In addition, after selecting the recording pulse conditions that improve the reproduction signal quality, the recording power test writing means performs trial writing by uniformly changing the recording power conditions for all the recording marks, and the recording power determination means The test writing by the power test writing means is reproduced and the recording power is determined.

  Therefore, in the present invention, first, the recording pulse condition that improves the reproduction signal quality is selected, and then the recording power condition is determined.

  As a result, it is possible to optimize the conditions for the recording power. Further, the recording power condition can be determined in a state where the recording pulse condition that improves the reproduction signal quality is fixed.

  An optical recording pulse condition setting method for an optical modulation recording / reproducing apparatus according to the present invention is the optical recording pulse condition setting method for the optical modulation recording / reproducing apparatus described above, wherein the recording pulse condition is set and then the mark length is shortest. The recording pulse condition with respect to the mark length is changed, test writing is performed on the optical recording medium, the test writing is reproduced, and the recording pulse condition for improving the reproduction signal quality is selected at least once. It is said.

  According to the above invention, after setting the recording pulse condition, the recording pulse condition for the mark length is changed from the shorter mark length, the test writing is performed on the optical recording medium, the test writing is reproduced, and the reproduction is performed. A process of selecting a recording pulse condition that improves the signal quality is performed at least once.

  Therefore, not only the recording pulse condition for improving the reproduction signal quality for the shortest recording mark in the recording pulse standard condition but also the reproduction signal for a recording mark longer than the shortest recording mark such as 3T mark, 4T mark,. Select a recording pulse condition that improves the quality.

  In the present invention, the process of selecting the recording pulse condition is performed at least once. For example, when there is a 2T mark to an 8T mark, the 7T mark is not used until the recording pulse condition is selected for the 8T mark. This indicates that the process may end when the recording pulse condition is selected.

  In the present invention, the recording pulse condition for the mark length is changed from the shorter mark length. Therefore, not only the recording pulse condition is changed one by one for each mark length, but also the next mark length to be performed is, for example, changing the recording pulse condition of the 5T mark instead of the 4T mark after the 3T mark. As long as it is longer than the current mark length.

  As a result, it is possible to reduce the influence of variations in the characteristics of the writable optical recording medium and the optical modulation recording / reproducing device, and to obtain the optimum recording pulse conditions for all the recording marks with higher accuracy, and to achieve good reproduction. Recording pulse condition setting for obtaining signal quality can be performed efficiently.

  An optical recording pulse condition setting method for an optical modulation recording / reproducing apparatus of the present invention is the optical recording pulse condition setting method for the optical modulation recording / reproducing apparatus described above, wherein a recording pulse standard condition is recorded on the optical recording medium. The recording pulse standard conditions are read out, and the recording pulse conditions used for test writing are set based on the recording pulse standard conditions.

  According to the above invention, the recording pulse standard condition is recorded on the optical recording medium, the recording pulse standard condition is read, and the recording pulse condition used for test writing is set based on the recording pulse standard condition.

  Therefore, when the recording pulse standard condition is recorded on the optical recording medium, the recording pulse condition used for the test writing can be set based on the recording pulse standard condition recorded on the optical recording medium.

  Further, the optical recording pulse condition setting method of the optical modulation recording / reproducing apparatus of the present invention is the optical recording pulse condition setting method of the optical modulation recording / reproducing apparatus described above, wherein the recording pulse standard condition is stored in the storage means of the optical modulation recording / reproducing apparatus. Is recorded, and the recording pulse standard condition is read, and the recording pulse condition used for test writing is set based on the recording pulse standard condition.

  According to the above invention, the recording pulse standard condition is recorded in the storage means of the optical modulation recording / reproducing apparatus, the recording pulse standard condition is read, and the recording pulse condition used for test writing is based on the recording pulse standard condition. Set.

  Therefore, when the recording pulse standard condition is recorded in the storage means of the light modulation recording / reproducing apparatus, the recording pulse standard condition recorded in the storage means of the light modulation recording / reproducing apparatus is used as the recording pulse condition used for test writing. Can be set based on.

  Further, the optical recording pulse condition setting method of the optical modulation recording / reproducing apparatus of the present invention is the optical recording pulse condition setting method of the optical modulation recording / reproducing apparatus described above, wherein the recording pulse condition changes a start end position of a recording mark. It is at least one of a recording pulse condition, a recording pulse condition for changing the end position of the recording mark, and a recording pulse condition for changing the width of the recording mark in the track direction.

  According to the above invention, the recording pulse condition includes the recording pulse condition for changing the start position of the recording mark, the recording pulse condition for changing the end position of the recording mark, and the recording pulse for changing the width of the recording mark in the track direction. At least one of the conditions.

  Therefore, by managing the parameters under any one of these recording pulse conditions, it is possible to reduce the influence of variations in characteristics of the writable optical disc and the optical modulation recording / reproducing apparatus with respect to the entire reproduced signal quality with high accuracy.

  The optical recording pulse condition setting method for an optical modulation recording / reproducing apparatus according to the present invention is characterized in that, in the optical recording pulse condition setting method for the optical modulation recording / reproducing apparatus, the reproduction signal quality is jitter. .

  That is, the jitter and the error rate are often used as indices for defining the power margin of the optical disc, and the recording state can be indicated by a value that matches the margin regulation threshold of the optical disc.

  In this regard, according to the present invention, since the reproduction signal quality is jitter, the reproduction signal quality can be improved from the viewpoint of jitter, that is, pulse distortion.

  An optical recording pulse condition setting method for an optical modulation recording / reproducing apparatus according to the present invention is the optical recording pulse condition setting method for the optical modulation recording / reproducing apparatus described above, wherein the reproduction signal quality is an error rate. Yes.

  That is, the jitter and the error rate are often used as indices for defining the power margin of the optical disc, and the recording state can be indicated by a value that matches the margin regulation threshold of the optical disc.

  In this regard, according to the present invention, since the reproduction signal quality is an error rate, the reproduction signal quality can be improved from the viewpoint of the error rate.

  The optical modulation recording / reproducing apparatus of the present invention is the optical modulation recording / reproducing apparatus described above, wherein the recording pulse test writing means sets the recording pulse condition and then records the mark length from the shorter one. Process of changing the pulse condition, performing trial writing on the optical recording medium, reproducing the trial writing by the reproduction signal quality detection means, and selecting the recording pulse condition that improves the reproduction signal quality by the selection means Is performed at least once.

  According to the above invention, the optical modulation recording / reproducing apparatus changes the recording pulse condition with respect to the mark length from the shorter mark length after setting the recording pulse condition by the recording pulse trial writing means, and performs optical recording. A test writing is performed on the medium, the test signal is reproduced by the reproduction signal quality detection means, and a process of selecting a recording pulse condition that improves the reproduction signal quality is performed at least once by the selection means.

  Therefore, it is possible to reliably and accurately reduce the influence of variations in characteristics of the writable optical recording medium and the optical modulation recording / reproducing apparatus for all the recording marks, and to obtain the optimum recording pulse condition. It is possible to provide an optical modulation recording / reproducing apparatus capable of efficiently performing recording pulse condition setting for obtaining a good reproduction signal quality.

  The control program of the present invention is a control program for operating the above-described optical modulation recording / reproducing apparatus, and is characterized by causing a computer to function as each of the means described above.

  According to said invention, the control program which makes a computer function as said each means can be provided.

  The computer-readable recording medium of the present invention is characterized in that the control program described above is recorded.

  According to the above invention, it is possible to provide a computer-readable recording medium in which a control program is recorded.

  As described above, the optical recording pulse condition setting method of the optical modulation recording / reproducing apparatus of the present invention changes the recording pulse condition for the shortest recording mark in the recording pulse standard condition, performs trial writing on the optical recording medium, This is a method of reproducing test writing and selecting a recording pulse condition that improves the quality of the reproduced signal.

  Further, as described above, the optical modulation recording / reproducing apparatus of the present invention includes a recording pulse trial writing means for performing trial writing on an optical recording medium by changing a recording pulse condition for the shortest recording mark, and a recording pulse trial writing. The reproduction signal quality detection means for reproducing the test writing by the means and detecting the reproduction signal quality, and the selection means for selecting the recording pulse condition for improving the reproduction signal quality are provided.

  Therefore, in the present invention, when the recording pulse condition that improves the reproduction signal quality is selected, the recording pulse condition for the shortest recording mark is changed.

  In other words, the shorter the mark length, the higher the influence on the entire mark, and the more precise the setting, so the better the recording pulse conditions for the shortest mark length, the better the overall reproduction signal quality. large.

  As a result, if the recording pulse condition that improves the reproduction signal quality is selected for the shortest recording mark, the influence of variations in the characteristics of the writable optical recording medium and the optical modulation recording / reproducing apparatus is reduced with respect to the entire reproduction signal quality. There is an effect that can be done.

  Further, conventionally, with respect to the method of giving a predetermined amount of change to any one of the combinations of the space length and the mark length, only a part of the recording marks can be improved even with the same mark length. However, in the present invention, since the reproduction signal quality is considered for all the recording marks, there is a problem that the reproduction signal quality in the recording marks and spaces of the recording medium cannot be expected to be greatly improved. There is an effect that there is no problem.

[Embodiment 1]
An embodiment of the present invention will be described with reference to FIGS. 1 to 6 as follows.

  In the optical disc apparatus 1 as an optical modulation recording / reproducing apparatus to which the optical recording pulse condition setting method of the present embodiment is applied, as shown in FIG. 2, the control unit 20 drives a pickup to a track (not shown) of the rotating optical disc 10. The pickup 12 is moved through the circuit 13.

  The pickup 12 is provided with an optical head 11. Then, the control unit 20 sets recording conditions via the laser drive circuit 14 and irradiates the recording part of the optical disk 10 with a recording laser beam from the optical head 11, whereby information is recorded on the track of the optical disk 10. .

  In the optical disc apparatus 1, the control unit 20 moves the pickup 12 to the recording part of the optical disc 10 via the pickup drive circuit 13. Then, the control unit 20 irradiates the optical disk 10 with a reproduction laser beam from the optical head 11 via the laser drive circuit 14.

  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. As a result, the optical disc apparatus 1 reproduces the information recorded on the track of the optical disc 10.

  Here, the optical disc apparatus 1 is particularly provided with a sensor 30. The sensor 30 is for detecting the loading of the optical disk 10 and / or for detecting a change in the recording environment on the optical disk 10, for example, a temperature sensor for detecting the temperature of the recording part of the optical disk 10. Consists of. Then, the sensor 30 outputs the detected result to the control unit 20 as a detection signal.

  In addition to when the optical disc 10 is loaded in the optical disc apparatus 1, the control unit 20 detects a predetermined change in the recording environment from the detection signal of the sensor 30 during the information recording operation, or the previous trial. When a predetermined time has elapsed since writing, the recording condition setting operation is appropriately started.

  As shown in FIG. 3, the optical disc apparatus 1 sets recording conditions based on trial writing to the setting area 41 of the optical disc 10. Information is recorded on each track according to the recording condition. Note that the recording operation to the user area 42 after setting the recording conditions of the optical disc apparatus 1 is the same as a generally known operation. Further, it is assumed that the recording pulse standard condition including the recording power setting information and the recording pulse width parameter is recorded in the setting area 41 in advance.

  The optical disc apparatus 1 reads the recording pulse standard condition in the setting area 41 and uses this recording pulse standard condition for setting the recording condition. Further, the read recording pulse standard condition may be stored in a memory which is a storage means provided in the control unit 20 and read and used. 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 10, or a plurality of setting areas 41 may exist.

Next, a specific optical recording pulse condition setting method in the present embodiment will be described with reference to FIGS. In the following description, (1, 7) RLL (Run Length Limited code) will be described as an example of the modulation method. However, the present invention is not limited to the (1,7) RLL modulation method. 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, as will be described in detail later, the pulse train of the recording pulse has a shortest recording mark composed of a start end portion and a terminal end portion. A long recording mark is constructed by adding an intermediate portion corresponding to the mark length between the start end portion and the end portion. In other modulation schemes, for example, the shortest recording mark length may start from 3T.
At this time, the shortest recording mark length is constituted by a start end portion, an intermediate portion, and an end portion (for example, a DVD-RW). Further, even if the shortest mark length is 2T, there are cases where the shortest mark length is composed only of the start end (for example, DVD-R).

  As shown in FIG. 4, a pulse train corresponding to recording information is set in consideration of a medium temperature distribution for recording on the optical disc 10. FIG. 4 shows a pulse train for dealing with 4T marks.

  As described above, the pulse train is configured by combining the start and end portions, and the intermediate portion above the 3T mark. Here, T represents the time for one clock cycle. Therefore, for example, a 4T mark refers to a mark, that is, a recording area where “1” is recorded in a time corresponding to four clock cycles.

  Further, as shown in the figure, the pulse train is composed of recording power, erasing power, and bias power, and these will be referred to as recording power conditions. In the figure, the recording powers of the pulses at the start end and the intermediate part are the same. However, the recording power is not necessarily limited to this, and a separate recording power may be used for each pulse.

  Next, FIG. 5 shows a pulse train for forming each of 2T mark to 8T mark, and parameters constituting recording pulse conditions. In the figure, dTtop is the pulse start position of the start end, Ttop is the pulse width of the start end, Tend is the pulse end position of the end, and Tmp is the pulse width of the intermediate part. The shape of the recording mark to be formed changes. Standard values of these parameters are recorded in advance in the setting area 41 of the optical disc 10 as recording pulse standard conditions. The recording power condition is set for each mark length, and the setting is independent. That is, the setting of the recording pulse condition (starting end and end) of the shortest recording mark is not used for setting the starting end and end of other mark lengths.

  Here, the relationship between each parameter and the formed recording mark is shown.

  First, when the start end pulse start position dTtop increases, the start end position of the recording mark moves forward. Conversely, when the start end pulse start position dTtop becomes smaller, the start end position of the recording mark moves backward.

  As a result, when the start end pulse width Ttop increases, the width in the track direction of the head portion of the recording mark increases. Conversely, when the start end pulse width Ttop decreases, the width of the head portion of the recording mark in the track direction increases. Decrease.

  When the end pulse end position Tend is increased, the end position of the recording mark is moved backward. Conversely, when the end pulse end position Tend becomes smaller, the end position of the recording mark moves forward.

  Further, when the intermediate portion pulse width Tmp increases, the width of the recording mark in the track direction increases. Conversely, when the intermediate pulse width Tmp is reduced, the width in the track direction is reduced.

  Next, using a test pattern including 2T mark to 8T mark, a jitter value when test writing was performed was measured. FIG. 6 shows a result of measuring jitter as a detection amount of the reproduction signal quality by recording only by changing the recording pulse condition of the 2T mark.

  First, condition (1) in FIG. 6 shows jitter when test writing is performed in the case of the recording pulse standard condition and the reproduction signal quality is detected. Jitter refers to disturbances such as amplitude, pulse width, pulse position, repetition frequency, and pulse interval in a pulse train.

  Further, the condition (2) in FIG. 6 is that when the recording pulse standard condition is the condition (1), the terminal pulse end position Tend of the condition (1) is increased by one step (here, about 1 ns). Condition (3) in FIG. 6 increases the start end pulse start position dTtop by one step in condition (2). Condition (4) in FIG. 6 increases the start end pulse width Ttop by one step in condition (3). 6 shows the jitter when test writing is performed and the reproduction signal quality is detected when the start end pulse width Ttop is further increased by one step in the condition (4). .

  From these results, the condition (3) that gives the best jitter is selected and set as the recording pulse condition.

  Next, a specific operation of recording condition setting in the optical disc apparatus 1 will be described with reference to the flowchart shown in FIG.

  First, the optical disc apparatus 1 reads and sets the recording pulse standard condition from the optical disc 10 under the control of the control unit 20 (S1). Subsequently, N representing the mark length is set to the value of the shortest mark length (S2). Here, if (1, 7) RLL is taken as an example of the modulation scheme, the value of N is set to 2.

  Next, only the recording pulse condition for the 2T mark is changed, and a test pattern is written on the setting area 41 by trial (S3). Further, the recorded test pattern is reproduced (S4). Then, based on the reproduction signal quality obtained in S4, a recording pulse condition with good reproduction signal quality is determined from the recording pulse conditions used for the trial writing. (S5).

  Note that, as the reproduction signal quality detection amount, not only jitter but also an error rate can be used.

  Both the error rate and the jitter are often defined as the power margin of the optical disc 10, and the recording state can be indicated by a value that matches the margin defined threshold of the optical disc 10.

  As described above, in the optical recording pulse condition setting method and the optical disc apparatus 1 according to the present embodiment, the recording pulse trial writing means changes the recording pulse condition for the shortest recording mark in the recording pulse standard condition to change the recording pulse condition on the optical disc 10. Do a test writing. The reproduction signal quality detection means reproduces the trial writing by the recording pulse trial writing means and detects the reproduction signal quality. Further, the selection means selects a recording pulse condition that improves the reproduction signal quality. The recording pulse trial writing means, the reproduction signal quality detecting means and the selecting means are controlled by the control unit 20 comprising a CPU.

  By the way, conventionally, when the mark formation characteristics with respect to the recording conditions differ for each recording mark length, even if a predetermined amount of change is uniformly applied, a good recording mark is not always formed at all mark lengths. It had the problem that.

  However, in the present embodiment, when the recording pulse condition that improves the reproduction signal quality is selected, the recording pulse condition for the shortest recording mark in the recording pulse standard condition is changed.

  That is, the shorter the mark length, the smaller the number of parameters to be changed in the recording pulse condition, and the more difficult it is to set the recording pulse condition for forming a recording mark with good reproduction signal quality. In addition, as the mark length is shorter, the appearance frequency increases in the data. Therefore, the shorter the mark length, the higher the influence on the entire mark, and the more precise the setting, so the better the recording pulse conditions for the shortest mark length, the better the overall reproduction signal quality. large.

  As a result, if a recording pulse condition that improves the reproduction signal quality is selected for the shortest recording mark, the influence of variations in the characteristics of the writable optical disc 10 and optical disc apparatus 1 can be reduced with respect to the overall reproduction signal quality. it can.

  Further, conventionally, with respect to the method of giving a predetermined amount of change to any one of the combinations of the space length and the mark length, only a part of the recording marks can be improved even with the same mark length. However, in the present embodiment, since the reproduction signal quality is considered for all the recording marks, there is a problem that the reproduction signal quality in the recording marks and spaces of the recording medium cannot be expected to be greatly improved. There is no problem with.

  Further, in the optical recording pulse condition setting method of the present embodiment, the recording pulse standard condition is recorded on the optical disc 10, the recording pulse standard condition is read, and the recording pulse condition used for test writing is set as the recording pulse standard. Set based on conditions.

  Therefore, when the recording pulse standard condition is recorded on the optical disc 10, the recording pulse condition used for the test writing can be set based on the recording pulse standard condition recorded on the optical disc 10.

  In the optical recording pulse condition setting method according to the present embodiment, the recording pulse condition includes a recording pulse condition for changing the start position of the recording mark, a recording pulse condition for changing the end position of the recording mark, and a track of the recording mark. At least one of the recording pulse conditions for changing the width of the direction.

  Therefore, by managing parameters in any one of these recording pulse conditions, it is possible to reduce the influence of variations in characteristics of the writable optical disc 10 and the optical modulation recording / reproducing apparatus with respect to the entire reproduced signal quality with high accuracy. .

  By the way, the jitter and error rate are often used as an index for defining the power margin of the optical disc 10, and the recording state can be indicated by a value that matches the margin regulation threshold of the optical disc 10.

  In this regard, according to the present embodiment, since the reproduction signal quality is jitter, the reproduction signal quality can be improved from the viewpoint of jitter, that is, pulse distortion.

  In addition, according to the present embodiment, since the reproduction signal quality is an error rate, the reproduction signal quality can be improved from the viewpoint of the error rate.

[Embodiment 2]
The following will describe another embodiment of the present invention with reference to FIG. The parts different from the present embodiment are the same as those in the first embodiment. Therefore, for convenience of explanation, members having the same functions as those shown in the drawings of the first embodiment are given the same reference numerals, and descriptions thereof are omitted.

  In the optical recording pulse condition setting method of the present embodiment, the number of recording pulses increases each time the recording mark length increases.

  That is, as described above, the shorter the mark length, the smaller the number of parameters to be changed in the recording pulse condition, and the more difficult it is to set the recording pulse condition for forming a recording mark with good reproduction signal quality. In addition, as the mark length is shorter, the appearance frequency increases in the data. Therefore, in the present embodiment, by setting each recording pulse condition from the shorter mark length, it is possible to efficiently perform recording pulse condition setting for obtaining good reproduction signal quality. .

  An optical recording pulse condition setting method in the optical disc apparatus 1 of the present embodiment will be described based on the flowchart of FIG. This flowchart is continued from S5 of the first embodiment, and the description up to S5 is the same as described above, and is therefore omitted.

  In the present embodiment, following S5 of the first embodiment, first, the reproduction signal quality of trial writing is detected (S11). If a result better than the predetermined reproduction signal quality is obtained in S11, the recording pulse condition setting is terminated. On the other hand, if a good result is not obtained, it is determined whether or not the mark length N (N is an integer of 2 or more) is the maximum (S12).

  If the mark length N is the maximum in S12, the recording condition setting operation is terminated because good reproduction signal quality is not obtained even if the recording conditions are set for all the mark lengths. Thereafter, the track used for the trial writing may be changed and the recording condition setting operation may be performed again, or an error display indicating a disk defect may be performed.

  On the other hand, if the mark length N is not the maximum in S12, the mark length is set to N + 1 (S13). And it returns to S3 of Embodiment 1.

  Thereby, it is possible to efficiently set the recording pulse condition for obtaining good reproduction signal quality.

  In the above description, the mark length is set to N + 1 in S13. However, the present invention is not limited to this, and it is possible to interrupt the number to be added to a number larger than 1, such as 2 or more. is there.

  As described above, in the optical recording pulse condition setting method of the present embodiment, after setting the recording pulse condition, the recording pulse condition for the mark length is changed from the shorter mark length, and test writing is performed on the optical disc 10. The test writing is reproduced, and the process of selecting the recording pulse condition that improves the reproduction signal quality is performed at least once.

  Therefore, not only the recording pulse condition that improves the reproduction signal quality for the shortest recording mark under the recording pulse standard conditions, but also the reproduction signal quality for the recording marks that are longer than the shortest recording mark such as 3T mark, 4T mark,. Select a recording pulse condition that improves.

  Note that the process of selecting the recording pulse condition is performed at least once, for example, when there is a 2T mark to an 8T mark, the recording pulse condition for the 7T mark is not performed without selecting the recording pulse condition for the 8T mark. This indicates that the process may end when the condition is selected. Further, the recording pulse condition for the mark length is changed from the shorter mark length. Therefore, not only the recording pulse condition is changed one by one for each mark length, but also the next mark length to be performed is, for example, changing the recording pulse condition of the 5T mark instead of the 4T mark after the 3T mark. Indicates that the mark length should be longer than the current mark length.

  As a result, with respect to all the recording marks, the influence of variations in the characteristics of the writable optical disc 10 and the light modulation recording / reproducing apparatus can be reduced more accurately, the optimum recording pulse condition can be obtained, and a good reproduction signal can be obtained. It is possible to efficiently set the recording pulse condition for obtaining the quality.

  Further, in the optical disc apparatus 1 of the present embodiment, after setting the recording pulse condition by the recording pulse trial writing means, the recording pulse condition for the mark length is changed from the shorter mark length on the optical recording medium. The test writing is performed, the test signal is reproduced by the reproduction signal quality detection means, and the selection means performs the process of selecting the recording pulse condition that improves the reproduction signal quality at least once. The recording pulse trial writing means, the reproduction signal quality detecting means and the selecting means are controlled by the control unit 20 comprising a CPU.

  Accordingly, it is possible to reliably reduce the influence of variations in the characteristics of the writable optical disc 10 and optical disc apparatus 1 for all the recording marks, to obtain optimum recording pulse conditions, and to obtain a good reproduction signal. It is possible to provide an optical disc apparatus 1 capable of efficiently performing recording pulse condition setting for obtaining quality.

[Embodiment 3]
The following will describe another embodiment of the present invention with reference to FIG. Note that portions different from the present embodiment are the same as in the first and second embodiments. Therefore, for convenience of explanation, members having the same functions as those shown in the drawings of Embodiment 1 and Embodiment 2 are given the same reference numerals, and the description thereof is omitted.

  In the optical recording pulse condition setting method of this embodiment, a favorable recording power condition is set by trial writing before setting the recording pulse condition. Thereby, it is possible to set the recording pulse condition with better accuracy.

  In this embodiment, in order to obtain a good recording power condition, test writing is performed by uniformly changing the recording power condition for all mark lengths. In the case of uniform change, the recording power condition, that is, at least one of the recording power, the erasing power, and the bias power in FIG. 4 may be changed by a factor, or the predetermined power may be increased or decreased. Also good.

  An optical recording pulse condition setting method in the optical disc apparatus 1 of the present embodiment will be described based on the flowchart of FIG.

  First, the optical disc apparatus 1 trial-writes a test pattern while changing the recording power condition (S21). Subsequently, the recorded test pattern is reproduced (S22). Next, the optimum recording power condition is determined from the recording power conditions used for the test writing based on the detection result of the reproduction signal obtained in S22 (S23). Thereafter, S1 and subsequent steps in FIG.

  As described above, by setting a good recording power condition by trial writing before setting the recording pulse condition, it is possible to set a more accurate recording pulse condition.

  As described above, in the optical recording pulse condition setting method and the optical disc apparatus 1 according to the present embodiment, the recording power trial writing means performs trial writing by uniformly changing the recording power conditions for all the recording marks, and the recording power determining means. Plays the test writing by the recording power test writing means, and determines the recording power condition. Further, the recording pulse trial writing means changes the recording pulse condition for the shortest recording mark in the recording pulse standard condition using the recording power determined by the recording power determination means, and performs trial writing on the optical disc 10. Further, the reproduction signal quality detection means reproduces the test writing by the recording pulse trial writing means, detects the reproduction signal quality, and the selection means selects a recording pulse condition that improves the reproduction signal quality. The above-described recording power trial writing means, recording power determining means, recording pulse trial writing means, reproduction signal quality detection means, reproduction signal quality detection means, and selection means are all controlled by the control unit 20 comprising a CPU. Do.

  Therefore, in the present embodiment, first, the recording power condition is determined, and then the recording pulse condition that improves the reproduction signal quality is selected.

  As a result, it is possible to optimize the conditions for the recording power. Further, it is possible to select a recording pulse condition that improves the reproduction signal quality while the recording power condition is fixed.

[Embodiment 4]
The following will describe still another embodiment of the present invention with reference to FIG. Note that portions different from the present embodiment are the same as those in the first to third embodiments. Therefore, for convenience of explanation, members having the same functions as those shown in the drawings of Embodiments 1 to 3 are given the same reference numerals, and descriptions thereof are omitted.

  In the third embodiment, after setting the recording power condition first, the recording pulse condition is set.

  In the optical recording pulse condition setting method of the present embodiment, on the contrary, after setting the recording pulse condition, a favorable recording power condition is set by trial writing. This also makes it possible to set recording power conditions with better accuracy.

  In this embodiment as well, in the same way as in the second embodiment, test writing is performed by uniformly changing the recording power conditions for all mark lengths in order to obtain good recording power conditions. However, when changing uniformly, it may be changed by a factor of the recording power condition, that is, at least one of the recording power, the erasing power and the bias power in FIG. 4, or the predetermined power may be increased or decreased. The same is true for the third embodiment.

  An optical recording pulse condition setting method in the optical disc apparatus 1 of the present embodiment will be described based on the flowchart of FIG. This flowchart is continued from S5 of the first embodiment, and the description up to S5 is the same as described above, and is therefore omitted.

  As shown in the figure, the optical disc apparatus 1 first executes up to S5 of the first embodiment, and then changes the recording power condition and trial-writes a test pattern (S31). Subsequently, the recorded test pattern is reproduced (S32). Based on the detection result of the reproduction signal obtained in S32, an optimum recording power condition is determined from the recording power conditions used for the test writing (S33).

  As described above, after setting the recording pulse condition, by setting a favorable recording power condition by trial writing, it is possible to set a more accurate recording condition.

[Embodiment 5]
The following will describe still another embodiment of the present invention with reference to FIG. Note that portions different from the present embodiment are the same as those in the first to fourth embodiments. Therefore, for convenience of explanation, members having the same functions as those shown in the drawings of Embodiments 1 to 4 are given the same reference numerals, and descriptions thereof are omitted.

  In the first to fourth embodiments, the recording pulse standard condition is stored in advance on the optical disc 10 as an optical recording medium, and the recording pulse condition is read out and set.

  In the optical recording pulse condition setting method of this embodiment, a recording pulse standard condition is output from the optical modulation recording / reproducing apparatus side, and after setting the recording pulse condition, a favorable recording power condition is set by trial writing. Thereby, even if the recording pulse standard condition is not stored in the optical disc 10 in advance, it is possible to set the recording power condition with good accuracy.

  In the optical disc apparatus 1 as an optical modulation recording / reproducing apparatus to which the optical recording pulse condition setting method of the present embodiment is applied, a storage unit 51 as a storage unit provided in the control unit 20 as shown in FIG. The recording pulse standard conditions are stored, and when the recording condition setting operation is started, the recording pulse standard conditions are read out and set in the laser drive circuit 14 via the output unit 52.

  Note that the storage unit 51 that stores the recording pulse standard conditions is not limited to the control unit 20 and may be installed outside the control unit 20. It may be a means.

  The optical recording pulse condition setting method in the optical disc apparatus 1 of the present embodiment corresponds to S1 in the flowchart of FIG.

  In this way, the recording pulse standard condition is output on the optical disc apparatus 1 side, and based on this, the recording pulse condition is changed, trial writing is performed, and the optimization is performed, so that the recording pulse standard condition is preliminarily recorded on the optical disc 10. Even if is not stored, it is possible to set recording pulse conditions with good accuracy.

  In addition, this Embodiment does not limit the scope of the present invention, and various modifications can be made within the scope of the present invention. For example, it is desirable to set the recording condition at least once for each track, but it is not always necessary to set it for all tracks, and may be set for each of a plurality of tracks.

  The optical disc apparatus 1 includes a CPU (Central Processing Unit) that is a calculation means for executing instructions of a program (control program, recording condition setting program) that realizes each function of the control unit 20, and a storage means that stores the program. A ROM (Lead Only Memory), a RAM (Random Access Memory) as a storage means for expanding the program, a storage device (storage medium) (not shown) such as a memory as a storage means for storing the program and various data, etc. I have.

  An object of the present invention is to provide a recording medium in which a program code (execution format program, intermediate code program, source program) of a control program, which is software for realizing the functions described above, can be read by a computer, the optical disc apparatus 1. This can also be achieved by reading the program code recorded in the recording medium and executing it by the computer (or CPU or MPU). In this case, since the program code itself read from the recording medium realizes the above-described function, the recording medium on which the program code is recorded constitutes the present invention.

  As described above, in the optical recording pulse condition setting method and the optical disc apparatus 1 according to the present embodiment, the recording pulse trial writing means changes the recording pulse condition for the shortest mark in the recording pulse standard condition to test on the optical disc 10. The reproduction signal quality detection means reproduces the test writing by the recording pulse trial writing means, detects the reproduction signal quality, and the selection means selects a recording pulse condition that improves the reproduction signal quality.

  In addition, after selecting the recording pulse condition that improves the reproduction signal quality, the recording power trial writing means performs trial writing by uniformly changing the recording power condition for all the recording marks, and controls as the recording power determination means. The unit 20 reproduces the test writing by the recording power test writing means and determines the recording power. Note that the control unit 20 including a CPU functions as the recording pulse trial writing unit, the reproduction signal quality detection unit, the selection unit, the recording power trial writing unit, and the recording power determination unit.

  Therefore, in the present embodiment, first, a recording pulse condition that improves the reproduction signal quality is selected, and then the recording power condition is determined.

  As a result, it is possible to optimize the conditions for the recording power. Further, the recording power condition can be determined in a state where the recording pulse condition that improves the reproduction signal quality is fixed.

  Further, in the optical recording pulse condition setting method of the present embodiment, the recording pulse standard condition is recorded in the storage unit 51 of the optical disc apparatus 1, the recording pulse standard condition is read, and the recording pulse condition used for test writing is set. It is set based on the recording pulse standard conditions.

  Therefore, when the recording pulse standard condition is recorded in the storage unit 51 of the optical disc apparatus 1, the recording pulse condition used for the test writing is based on the recording pulse standard condition recorded in the storage unit 51 of the optical disc apparatus 1. Can be set.

  The control program of the present embodiment is a control program for operating the above-described optical disc apparatus 1, and causes a computer to function as each of the means described above.

  Therefore, it is possible to provide a control program that causes a computer to function as each of the above-described means.

  Further, the computer-readable recording medium of the present embodiment is a recording medium of the control program described above.

  Therefore, it is possible to provide a computer-readable recording medium in which the control program is recorded.

  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. Embodiments to be described are also included in the technical means of the present invention.

  The present invention relates to an optical disc apparatus as an optical modulation recording / reproducing apparatus in which a recording pulse standard condition is recorded, or a control program thereof, and an optical recording medium. It can be applied to the optical disc as.

5 is a flowchart showing an embodiment of an optical recording pulse condition setting method for an optical disc apparatus according to the present invention. It is a block diagram which shows the structure 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 parameter for setting the pulse train and recording pulse conditions for forming 8T mark from 2T mark. It is a graph which shows the jitter measurement result in the said optical recording pulse condition setting method. It is a flowchart which shows other embodiment of the optical recording pulse condition setting method in this invention. It is a flowchart which shows other embodiment of the optical recording pulse condition setting method in this invention. It is a flowchart which shows other embodiment of the optical recording pulse condition setting method in this invention. It is a block diagram which shows the structure of the control part in the optical modulation recording / reproducing apparatus of this invention.

Explanation of symbols

1. Optical disk device (light modulation recording / reproducing device)
10 Optical disc (optical recording medium)
12 pickup 16 recording / reproducing circuit group 20 control unit (recording pulse trial writing means, reproduction signal quality detecting means, selection means
Recording power test writing means, recording power determination means)
30 Sensor 41 Setting area

Claims (15)

In an optical recording pulse condition setting method of an optical modulation recording / reproducing apparatus for performing optical modulation recording based on a recording pulse corresponding to recording information and reproducing the recorded information,
Test writing is performed on the optical recording medium by changing the recording pulse condition composed of at least one of the pulse start position, pulse width, and pulse end position for the shortest recording mark length , and the test writing is reproduced. After selecting the recording pulse conditions that improve the playback signal quality,
If the playback signal quality of the trial writing is better than the predetermined playback signal quality, the recording pulse condition setting is terminated,
When the reproduction signal quality of the test writing is not better than the predetermined reproduction signal quality, the recording pulse condition for the recording mark length is changed from the shorter recording mark length, and the test writing is performed on the optical recording medium. When the test writing is performed, the recording pulse condition that improves the playback signal quality is selected, and the process of determining whether the playback signal quality of the test writing is better than the predetermined playback signal quality is performed at least once. Ends the setting of the recording pulse condition , An optical recording pulse condition setting method for an optical modulation recording / reproducing apparatus, In an optical recording pulse condition setting method of an optical modulation recording / reproducing apparatus for performing optical modulation recording based on a recording pulse corresponding to recording information and reproducing the recorded information,
After performing trial writing with uniform changes to the recording power conditions for all recording marks, and determining the recording power conditions for obtaining good reproduction signal quality,
Test writing is performed on the optical recording medium by changing the recording pulse condition composed of at least one of the pulse start position, pulse width, and pulse end position for the shortest recording mark length , and the test writing is reproduced. After selecting the recording pulse conditions that improve the playback signal quality,
If the playback signal quality of the trial writing is better than the predetermined playback signal quality, the recording pulse condition setting is terminated,
When the reproduction signal quality of the test writing is not better than the predetermined reproduction signal quality, the recording pulse condition for the recording mark length is changed from the shorter recording mark length, and the test writing is performed on the optical recording medium. When the test writing is performed, the recording pulse condition that improves the playback signal quality is selected, and the process of determining whether the playback signal quality of the test writing is better than the predetermined playback signal quality is performed at least once. Ends the setting of the recording pulse condition , An optical recording pulse condition setting method for an optical modulation recording / reproducing apparatus, In an optical recording pulse condition setting method of an optical modulation recording / reproducing apparatus for performing optical modulation recording based on a recording pulse corresponding to recording information and reproducing the recorded information,
Test writing is performed on the optical recording medium by changing the recording pulse condition including at least one of the pulse start position, the pulse width, and the pulse end position for the shortest recording mark, and the test writing is reproduced. After selecting the recording pulse conditions that improve the playback signal quality,
An optical recording pulse condition setting method for an optical modulation recording / reproducing apparatus, characterized in that trial writing is performed by uniformly changing the recording power condition for all recording marks, and a recording power condition for obtaining good reproduction signal quality is determined. . After selecting the recording pulse condition for the shortest recording mark, the recording pulse condition for the mark length is changed from the shorter mark length, trial writing is performed on the optical recording medium, the trial writing is reproduced, and the reproduction signal is reproduced. 4. The optical recording pulse condition setting method for an optical modulation recording / reproducing apparatus according to claim 3, wherein the process of selecting a recording pulse condition for improving quality is performed at least once.   2. A recording pulse standard condition is recorded on the optical recording medium, the recording pulse standard condition is read, and a recording pulse condition used for test writing is set based on the recording pulse standard condition. 5. An optical recording pulse condition setting method for an optical modulation recording / reproducing apparatus according to any one of items 1 to 4.   A recording pulse standard condition is recorded in the storage means of the optical modulation recording / reproducing apparatus, the recording pulse standard condition is read, and a recording pulse condition used for test writing is set based on the recording pulse standard condition An optical recording pulse condition setting method for an optical modulation recording / reproducing apparatus according to any one of claims 1 to 4. The recording pulse condition is:
Recording pulse conditions for changing the start position of the recording mark,
Recording pulse conditions for changing the end position of the recording mark,
7. The optical recording pulse condition of the optical modulation recording / reproducing apparatus according to claim 1, wherein the recording pulse condition is at least one of a recording pulse condition for changing a width of the recording mark in a track direction. Setting method.   8. The optical recording pulse condition setting method for an optical modulation recording / reproducing apparatus according to claim 1, wherein the reproduction signal quality is jitter.   8. The optical recording pulse condition setting method for an optical modulation recording / reproducing apparatus according to claim 1, wherein the reproduction signal quality is an error rate. In an optical modulation recording / reproducing apparatus for performing optical modulation recording based on a recording pulse corresponding to recording information and reproducing the recorded information,
A recording pulse trial writing means for performing trial writing on an optical recording medium by changing a recording pulse condition composed of at least one of a pulse start position, a pulse width, and a pulse end position;
Reproduction signal quality detection means for detecting the reproduction signal quality of the test writing recorded on the optical recording medium;
Selecting means for selecting the recording pulse condition that improves the reproduction signal quality ,
The recording pulse condition for the shortest recording mark length is set by the recording pulse trial writing means, then trial writing is performed on the optical recording medium by the recording pulse trial writing means, and the reproduction signal quality detection means is After reproducing the test writing and selecting the recording pulse condition that improves the reproduction signal quality by the selection means, if the reproduction signal quality of the test writing is better than a predetermined reproduction signal quality, the recording pulse test writing is performed. End the recording pulse condition setting by means,
When the reproduction signal quality detected as a result of reproducing the trial writing by the reproduction signal quality detection means is not better than a predetermined reproduction signal quality, the recording pulse trial writing means starts from the shorter recording mark length. , Test writing is performed by changing the recording pulse condition with respect to the recording mark length, the test writing is reproduced by the reproduction signal quality detection means, and the recording pulse condition that improves the reproduction signal quality is selected by the selection means Then, the optical modulation recording / reproducing apparatus is characterized in that the process of determining whether the reproduction signal quality of the trial writing is better than the predetermined reproduction signal quality is performed at least once, and when it is good, the recording pulse condition setting is ended . In an optical modulation recording / reproducing apparatus for performing optical modulation recording based on a recording pulse corresponding to recording information and reproducing the recorded information,
Recording power trial writing means for performing trial writing by uniformly changing the recording power condition for all recording marks;
Recording power determining means for reproducing the test writing by the recording power test writing means and determining the recording power condition;
Using the recording power determined by the recording power determining means, the recording pulse condition composed of at least one of the pulse start position, the pulse width, and the pulse end position is changed and tested on the optical recording medium. Recording pulse trial writing means for writing,
Reproduction signal quality detection means for detecting the reproduction signal quality of the test writing recorded on the optical recording medium;
Selecting means for selecting the recording pulse condition that improves the reproduction signal quality ,
The recording pulse condition for the shortest recording mark length is set by the previous recording pulse trial writing means, then trial writing is performed on the optical recording medium by the recording pulse trial writing means, and the reproduction signal quality is determined by the selection means. If the reproduction signal quality detected as a result of reproducing the test writing by the reproduction signal quality detecting means after selecting a recording pulse condition to be improved is better than a predetermined reproduction signal quality, the recording pulse test writing is performed. End the recording pulse condition setting by means,
When the reproduction signal quality detected as a result of reproducing the trial writing by the reproduction signal quality detection means is not better than a predetermined reproduction signal quality, the recording pulse trial writing means starts from the shorter recording mark length. , Test writing is performed by changing the recording pulse condition with respect to the recording mark length, the test writing is reproduced by the reproduction signal quality detection means, and the recording pulse condition that improves the reproduction signal quality is selected by the selection means Then, the optical modulation recording / reproducing apparatus is characterized in that the process of determining whether the reproduction signal quality of the trial writing is better than the predetermined reproduction signal quality is performed at least once, and when it is good, the recording pulse condition setting is ended . In an optical modulation recording / reproducing apparatus for performing optical modulation recording based on a recording pulse corresponding to recording information and reproducing the recorded information,
Recording pulse trial writing means for performing trial writing on an optical recording medium by changing a recording pulse condition composed of at least one of a pulse start position, a pulse width, and a pulse end position for the shortest recording mark; ,
Reproduction signal quality detection means for reproducing the trial writing by the recording pulse trial writing means and detecting the reproduction signal quality;
A selection means for selecting a recording pulse condition that improves the reproduction signal quality;
A recording power test writing means for performing test writing by adding a uniform change to the recording power condition for all the recording marks after selecting a recording pulse condition for improving the reproduction signal quality;
An optical modulation recording / reproducing apparatus comprising: recording power determining means for reproducing test writing by the recording power test writing means and determining recording power. After selecting the recording pulse condition for the shortest recording mark by the selection means , the recording pulse condition for the mark length is changed from the shorter mark length, and trial writing is performed on the optical recording medium,
The test writing is reproduced by the reproduction signal quality detection means,
13. The optical modulation recording / reproducing apparatus according to claim 12, wherein the selection unit performs at least one process of selecting a recording pulse condition that improves a reproduction signal quality.   A control program for operating the optical modulation recording / reproducing apparatus according to claim 10, wherein the computer functions as each of the means.   15. A computer-readable recording medium on which the control program according to claim 14 is recorded.

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