JP2005108374A - Optical modulation recording condition setting device, optical modulation recording condition setting method, optical modulation recording and reproducing apparatus, control program, and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical modulation recording condition setting method which maintains reproduction signal quality by forming good recording marks. <P>SOLUTION: The optical disk recording information by optical modulation is subjected setting of recording conditions of information to the optical disk according to the reproduction signal obtained by reproducing the information written in trial to the optical disk by laser irradiation of multipulses by; setting recording pulse conditions (step S 1); then changing and setting recording power Pw and erasing power Pe (a step S 2); deciding whether the recording power Pw is above the standard recording power Pw0 under the standard recording conditions or not (a step S 3); and changing and setting the recording pulse conditions when the recording power Pw is greater (a step S 4). <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a light modulation recording condition setting device, a light modulation recording condition setting method, a light modulation recording / reproducing device, a control program, and a control program for setting light modulation recording conditions for a recording medium such as an optical disk capable of light modulation recording. The present invention relates to a recording medium on which is recorded.

  In recent years, various devices (light modulation recording / reproducing apparatuses) for recording data using a recording medium such as an optical disk capable of light modulation recording have been proposed. Optical discs such as CD-R and DVD-R have been developed as recording media capable of such optical modulation recording, and optical modulation recording / reproducing apparatuses corresponding to these optical discs record on tracks on the optical disc. Data is recorded on a recording medium by irradiating laser light modulated by data and changing the phase, for example. In the following description, unless otherwise specified, an optical disk refers to a recording medium capable of optical modulation recording, and a recording / reproducing apparatus refers to a recording apparatus capable of optical modulation recording and optical modulation recorded data. A reproducible playback device is shown.

  By the way, when data recording is performed with laser light in this way, the power of the laser light, specifically, the recording power and the erasing power must be set to appropriate values. However, when an optical disk recording / reproducing apparatus is mass-produced, individual apparatuses do not always have the same characteristics due to variations in the characteristics of parts used, environmental changes, and the like. 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, a mass-produced optical disk using a reference disk having standard characteristics and having a variation in characteristics even if the standard recording conditions are determined by a reference apparatus (reference recording / reproducing apparatus) having standard characteristics. If the device and the device are used as they are, proper recording / reproduction may not be performed depending on the combination, resulting in a problem of quality defects.

  For this reason, the recording apparatus normally performs trial writing to determine optimum recording conditions, and data is written to the optical disc under the determined optimum recording conditions.

  In this trial writing operation, the trial writing is performed by irradiating the laser while changing the recording condition to the trial writing area (test area) prepared on the optical disc, and the reproduction signal quality (for example, jitter level) of the trial writing portion is performed. Or an error rate) to determine the optimum recording condition. By this trial writing operation, it is possible to realize a recording operation under the optimal recording conditions during recording.

  As a technique for performing such trial writing, for example, in Patent Document 1, recording writing and a laser emission waveform rule (recording pulse condition) are used as recording conditions, and trial writing using a plurality of recording power and a plurality of laser emission waveform rules is performed. And a method of setting optimum recording conditions according to the result is described.

  However, in the method described in Patent Document 1, there are a large number of combinations of recording power and laser emission waveform rules for use in test writing, and therefore there is a problem that it takes a lot of time to set optimal recording conditions. Arise.

Therefore, in Patent Document 2, in order to reduce the combination of recording conditions used for trial writing, recording is performed by changing the recording power and the erasing power while maintaining a constant ratio of the recording power and the erasing power, and the optimum recording condition A method of setting is disclosed.
JP 2000-182244 A (released on June 30, 2000) JP 2000-251257 A (published September 14, 2000)

  However, as described in Patent Document 2, when the optimum recording condition is set by changing the recording power and the erasing power while maintaining a constant ratio, the following various problems occur.

  (1) When the optimum recording conditions are set in the range of the recording power and the erasing power higher than the standard recording conditions described above, both the recording power and the erasing power are larger than the standard recording power and the erasing power. There is a possibility that the cooling required for forming the film cannot be sufficiently performed. In this case, since a proper recording mark cannot be formed, the reproduction signal quality deteriorates.

  (2) When the optimum recording conditions are set within the range of the recording power and the erasing power lower than the standard recording conditions described above, both the recording power and the erasing power are smaller than the standard recording power and the erasing power. Considering various margins with respect to power and erasing power, a predetermined calculation such as adding a predetermined amount of power is performed to set final recording conditions. As described above, since the recording power obtained by the calculation is not the recording power actually used for the test writing, depending on the recording conditions, the recording mark cannot be formed properly, and the reproduction signal quality may be deteriorated. In particular, when the set recording power and erasing power are larger than the standard recording conditions described above, the recording mark is not properly formed, and the recording state deteriorates.

  From the above, when both the recording power and the erasing power paired with the recording power are changed and both become large, especially when the recording power becomes higher than the above standard recording conditions, an appropriate recording mark Cannot be formed in many cases, which causes a problem of deteriorating the reproduction signal quality.

  The present invention has been made in view of the above-mentioned problems, and its purpose is to form an appropriate recording mark and not to deteriorate the reproduction signal quality even if both the recording power and the erasing power are increased. An object of the present invention is to provide an optical modulation recording condition setting device, an optical modulation recording condition setting method, an optical modulation recording / reproducing device, a control program, and a recording medium on which the control program is recorded.

  In order to solve the above problems, an optical modulation recording condition setting apparatus according to the present invention is tested by irradiating an optical disc capable of recording information by optical modulation by irradiating a laser having a light emission waveform of one or more pulse trains. In a light modulation recording condition setting device for setting conditions for recording information on the optical disc in accordance with a reproduction signal obtained by reproducing written information, recording condition setting for setting recording conditions for trial writing on the optical disc And trial writing means for performing trial writing based on the recording conditions of trial writing set by the recording condition setting means, wherein the recording condition setting means has a large recording laser power and / or erasing laser power. It is characterized in that the recording condition for trial writing is set using the recording pulse condition depending on the length.

  The recording condition setting means uses a reference disk having standard characteristics, and standardizes recording laser power and erasing laser power when the recording conditions determined by the reference apparatus having standard characteristics are standard recording conditions. When the recording laser power and the standard erasing laser power are set, the recording laser power and the standard recording laser power value, or / and the erasing laser power and the standard erasing laser power value are compared. The recording pulse condition is set.

  When the recording laser power is larger than the standard recording laser power, the recording condition setting means sets the test writing recording condition using a recording pulse condition changed according to the recording laser power. It is characterized by.

  When the recording condition setting means includes a recording pulse, an erasing pulse, and a bias pulse as the recording laser pulse, and the recording laser power is greater than the standard recording laser power, the recording laser power Accordingly, the recording pulse condition and / or the erasing pulse width are narrowed, or the recording condition of the trial writing is set using the recording pulse condition where the bias pulse width is widened.

  When the recording laser power is smaller than the standard recording laser power, the recording condition setting means sets a recording condition for trial writing using a recording pulse condition that does not change according to the recording laser power. It is a feature.

The recording condition setting means, when the recording laser power and the erasing laser power when the recording condition obtained by the trial writing performed at least once is the standard recording condition are the standard recording laser power and the standard erasing laser power, The recording laser power and the standard recording laser power value or / and the erasing laser power and the standard erasing laser power value are compared, and the recording pulse condition is set based on the comparison result. .
The standard recording condition is characterized in that it is set based on a recording condition obtained by trial writing performed at least once.

  The standard recording condition is set based on a recording condition recorded in advance on an optical disc.

  The recording condition setting means sets the recording pulse condition by changing the pulse width at the end of the recording pulse.

  The recording condition setting means is characterized in that the recording pulse condition is set by changing the pulse width of the start end and / or intermediate part of the recording pulse.

  In order to solve the above-described problem, another optical modulation recording condition setting device according to the present invention irradiates an optical disc capable of recording information by optical modulation with a laser whose emission waveform is composed of one or more pulse trains. Recording for setting recording conditions for trial writing on the optical disc in the optical modulation recording condition setting device for setting recording conditions for information on the optical disc in accordance with a reproduction signal obtained by reproducing the information written by trial writing Based on the condition setting means, the trial writing recording condition set by the recording condition setting means, the trial writing means for performing trial writing, and the information written by the trial writing means are reproduced and the reproduction signal is detected. The recording condition setting means is a predetermined condition defined by the signal quality of the reproduction signal detected by the reproduction signal detection means. If not satisfied, it is characterized by setting the recording condition test writing using recording pulse condition which depends on the size of the recording laser power and / or erasing laser power.

  The recording condition setting means uses a reference disk having standard characteristics, and standardizes recording laser power and erasing laser power when the recording conditions determined by the reference apparatus having standard characteristics are standard recording conditions. When the recording laser power and the standard erasing laser power are set, and the signal quality of the reproduction signal detected by the reproduction signal detection means does not satisfy a predetermined condition, the values of the recording laser power and the standard recording laser power, or / And comparing the value of the erasing laser power and the standard erasing laser power, and setting the recording pulse condition based on the comparison result.

  The case where the predetermined condition is not satisfied is characterized in that the signal quality of the reproduction signal detected by the reproduction signal detecting means is worse than a predetermined value.

  When the predetermined condition is not satisfied, the value based on the signal amplitude of the reproduction signal detected by the reproduction signal detecting means is smaller than the predetermined value.

  In order to solve the above-described problem, another optical modulation recording condition setting device according to the present invention is an optical disc capable of recording information by optical modulation. In a light modulation recording condition setting device for setting conditions for recording information on the optical disc in accordance with a reproduction signal obtained by reproducing information written on trial by irradiation, the recording condition for trial writing on the optical disc is set. A recording condition setting unit; and a trial writing unit that performs trial writing based on the recording condition of the trial writing set by the recording condition setting unit. The recording condition setting unit is at least once by the trial writing unit. A predetermined calculation is added to the recording conditions obtained by the trial writing performed, and the recording laser power or / and the erasing laser power obtained by this calculation are added. It is characterized by setting the optimum recording condition by using the recording pulse conditions depending on the size of the over.

  In order to solve the above-described problem, another optical modulation recording condition setting device according to the present invention is an optical disc capable of recording information by optical modulation. In a light modulation recording condition setting device for setting conditions for recording information on the optical disc in accordance with a reproduction signal obtained by reproducing information written on trial by irradiation, the recording condition for trial writing on the optical disc is set. A recording condition setting unit; and a trial writing unit for performing trial writing based on the recording condition of the trial writing set by the recording condition setting unit, wherein the recording condition setting unit records the recording condition recorded in advance on the optical disc. A predetermined calculation is added to the above, and a recording pulse condition depending on the magnitude of the recording laser power or / and the erasing laser power obtained by this calculation is used. It is characterized by setting an optimal recording condition.

  The recording condition setting means uses a reference disk having standard characteristics, and standardizes recording laser power and erasing laser power when the recording conditions determined by the reference apparatus having standard characteristics are standard recording conditions. When the recording laser power and the standard erasing laser power are used, the recording laser power obtained by the calculation and the standard recording laser power value or / and the erasing laser power obtained by the calculation and the standard erasing laser power value A comparison is made, and the recording pulse condition is set based on the comparison result.

  In order to solve the above problems, a light modulation recording condition setting method according to the present invention performs test writing on an optical disc capable of recording information by light modulation by irradiating a laser having a pulse train having one or more light emission waveforms. In the light modulation recording condition setting method for setting the recording condition of information on the optical disc according to the reproduction signal obtained by reproducing the recorded information, it depends on the magnitude of the recording laser power and / or the erasing laser power It is characterized in that recording conditions for trial writing are set using recording pulse conditions.

  The recording laser power and the erasing laser power are the standard recording laser power and the standard erasing laser when a standard disk having a standard characteristic is used and the recording condition determined by the standard device having the standard characteristic is the standard recording condition. When the power is set, the values of the recording laser power and the standard recording laser power or / and the erasing laser power and the standard erasing laser power are compared, the recording pulse condition is adjusted based on the comparison result, and the adjusted recording pulse condition Is used to set the test writing recording conditions.

  When the magnitude of the recording laser power is equal to or higher than the standard recording laser power, the recording pulse condition is changed, and the recording condition for the trial writing is set using the changed recording pulse condition.

  In another light modulation recording condition setting method according to the present invention, in order to solve the above problems, an optical disk capable of recording information by light modulation is irradiated with a laser having a pulse train having one or more emission waveforms. In the light modulation recording condition setting method for setting the information recording condition on the optical disc in accordance with the reproduction signal obtained by reproducing the trial written information, the trial writing is performed under an arbitrary trial writing recording condition. When the reproduction signal that reproduces the written information does not satisfy the predetermined condition that defines the signal quality, the recording condition of the trial writing is set using the recording pulse condition depending on the magnitude of the recording laser power and / or the erasing laser power. It is characterized by setting.

  Still another optical modulation recording condition setting method according to the present invention is obtained by reproducing information written on a trial basis at least once on an optical disc capable of recording information by optical modulation, in order to solve the above-described problem. In the optical modulation recording condition setting method for setting the optimum recording condition of information on the optical disc by performing a predetermined calculation based on the reproduced signal, the magnitude of the recording laser power and / or erasing laser power obtained by the calculation The optimum recording condition is set using the recording pulse condition depending on the depth.

  Still another light modulation recording condition setting method according to the present invention is to solve the above-mentioned problems, with respect to an optical disk capable of recording information by light modulation, with respect to a recording condition recorded in advance on the optical disk. In the optical modulation recording condition setting method for setting an optimum recording condition of information on the optical disc by performing a predetermined calculation, a recording pulse depending on the magnitude of the recording laser power or / and the erasing laser power obtained by the calculation It is characterized in that optimum recording conditions are set using conditions.

  In order to solve the above problems, an optical modulation recording / reproducing apparatus according to the present invention includes the above-described optical modulation recording condition setting apparatus.

  In order to solve the above problems, a control program according to the present invention is a control program for operating an optical modulation recording condition setting device, and causes a computer to function as each unit in the optical modulation recording condition setting device. It is said.

  The recording medium according to the present invention is characterized in that the control program is recorded in order to solve the above problems.

  By the way, when recording is performed by changing the recording laser power and the erasing laser power, the reproduction signal quality deteriorates in the vicinity of the high recording laser power. This is because both the recording laser power and the erasing laser power are increased, so that the cooling required for forming the recording mark is insufficient. Deterioration of playback signal quality may occur under conditions close to the recording conditions that can form good recording marks. Even if recording is performed under the recording conditions set as good conditions by trial writing, the environment changes in the device. If the recording pulse width fluctuates, the recording state may be deteriorated.

  Therefore, the light modulation recording condition setting device according to the present invention has the recording condition setting means for setting the recording condition for the trial writing on the optical disc and the recording condition for the trial writing set by the recording condition setting means as described above. The recording condition setting means sets the recording condition for the trial writing by using the recording pulse condition depending on the recording laser power and / or the erasing laser power. Thus, a good recording mark is formed on the optical disc so that the reproduction signal quality is not deteriorated.

  Therefore, for example, when the recording power condition (recording laser power, erasing laser power) is large, the recording pulse condition is changed and set, and trial writing is performed. Recording conditions can be obtained. That is, there is an effect that it is possible to reduce the influence of the characteristic variation of the writable optical disc and the optical disc apparatus.

  The recording condition setting means uses a reference disk having standard characteristics, and standardizes recording laser power and erasing laser power when the recording conditions determined by the reference apparatus having standard characteristics are standard recording conditions. When the recording laser power and the standard erasing laser power are set, the recording laser power and the standard recording laser power value, or / and the erasing laser power and the standard erasing laser power value are compared. Since the recording pulse condition is set, the recording pulse condition based on the standard recording condition is set.

  Therefore, the recording condition of the trial writing can be appropriately set.

  Further, the recording condition setting means sets the recording condition for the trial writing using the recording pulse condition changed in accordance with the recording laser power when the recording laser power is larger than the standard recording laser power. Therefore, even when the recording laser power is large, an appropriate recording pulse condition is set.

  Therefore, the recording condition of the trial writing can be appropriately set.

  Usually, a laser (multi-pulse laser) having a pulse train having one or more light emission waveforms includes three types of pulses: a recording pulse, an erasing pulse, and a bias pulse. Among these, the bias pulse is a low level pulse with respect to the recording pulse and the erasing pulse, and the longer the bias pulse, the longer the period for cooling the recording mark heated by the recording pulse. In addition, the shorter the bias pulse, the shorter the period for cooling the recording mark heated by the recording pulse.

  Therefore, the recording condition setting means includes a recording pulse, an erasing pulse, and a bias pulse as the recording laser pulses, and the recording laser power is larger than the standard recording laser power. Depending on the laser power, the recording pulse width and / or the erasing pulse width is narrowed, or the recording condition of the trial writing is set using the recording pulse condition with a wide bias pulse width, so that the recording heated by the recording pulse is performed. The period for cooling the mark can be shortened.

  Therefore, since the recording mark can be formed appropriately, the signal quality of the reproduction signal can be improved.

  When the recording laser power is smaller than the standard recording laser power, the recording condition setting means sets a recording condition for trial writing using a recording pulse condition that does not change according to the recording laser power. At least, trial writing can be performed under standard recording conditions.

  Therefore, it is possible to prevent the reproduction signal from deteriorating when the recording laser power is smaller than the standard recording laser power.

  The recording condition setting means, when the recording laser power and the erasing laser power when the recording condition obtained by the trial writing performed at least once is the standard recording condition are the standard recording laser power and the standard erasing laser power, More accurate by comparing the value of the recording laser power and the standard recording laser power, or / and the value of the erasing laser power and the standard erasing laser power, and setting the recording pulse condition based on the comparison result High test writing recording conditions can be set. Here, it is determined that the quality of the reproduced signal, for example, jitter or error rate is below a predetermined value, is appropriate, and when it is higher than the predetermined value, it is determined to be inappropriate. If this is set, it is possible to set test writing recording conditions with higher accuracy.

  Since the standard recording conditions are set based on the recording conditions recorded in advance on the optical disc, it is possible to set the recording conditions for test writing with higher accuracy. In other words, the trial writing recording conditions recorded in advance on the optical disc to be recorded are usually set assuming the optimum recording conditions for the optical disc, so it is possible to set a more accurate trial writing recording condition. it can.

  The recording condition setting means can form an appropriate recording mark by setting the recording pulse condition by changing the pulse width at the end of the recording laser pulse. In other words, in this case, since the end of the laser pulse indicates that a low level voltage, that is, a bias level voltage with respect to the recording pulse is applied, by widening the pulse width of the end of the laser pulse, The cooling period necessary for forming the recording mark can be lengthened, and an appropriate recording mark can be formed. However, if the pulse width at the end is too long, the reproduced signal quality may be deteriorated. Therefore, it is desirable to set the pulse width so that it does not deteriorate compared to the reference reproduced signal quality.

  The recording condition setting means can form an appropriate recording mark by setting the recording pulse condition by changing the pulse width of the start end and / or intermediate part of the recording pulse. That is, in this case, since the high end voltage of the recording pulse is applied to the start end portion and / or the intermediate portion of the laser pulse, the start end portion and / or the intermediate portion of the laser pulse is narrowed. This indicates that the heating period when forming the recording mark on the optical disc is shortened. As a result, the cooling required for the recording mark can be sufficiently performed, so that an appropriate recording mark can be formed. However, if the starting end and / or the intermediate portion is made too narrow, an appropriate recording mark cannot be formed. Therefore, it is desirable to set the pulse width so as not to deteriorate the reproduction signal quality as a reference.

  Other light modulation recording condition setting device according to the present invention, as described above, when the recording condition setting means does not satisfy a predetermined condition defined by the signal quality of the reproduction signal detected by the reproduction signal detection means, By setting the recording condition of the trial writing using the recording pulse condition depending on the magnitude of the recording laser power and / or the erasing laser power, it is possible to suppress the deterioration of the quality of the reproduction signal.

  The recording condition setting means uses a reference disk having standard characteristics, and standardizes recording laser power and erasing laser power when the recording conditions determined by the reference apparatus having standard characteristics are standard recording conditions. When the recording laser power and the standard erasing laser power are set, and the signal quality of the reproduction signal detected by the reproduction signal detection means does not satisfy a predetermined condition, the values of the recording laser power and the standard recording laser power, or / And comparing the value of the erasing laser power with the standard erasing laser power, and setting the recording pulse condition based on the comparison result, it is possible to reliably suppress the deterioration of the quality of the reproduction signal.

  Therefore, when trial writing is performed while changing the recording power and erasing power, and the reproduction signal does not satisfy the desired condition, for example, when the jitter is worse than a certain threshold, the value of the recording pulse condition is reset and the trial writing is performed. I do. At this time, if the set recording laser power is larger than the standard recording laser power, among the recording pulse conditions, the pulse width at the end portion is increased or / and the pulse width at the start end portion and the intermediate portion is decreased. By setting as described above, there is an effect that deterioration of the reproduction signal quality can be reduced.

  When the predetermined condition is not satisfied, there may be a case where the signal quality of the reproduction signal detected by the reproduction signal detecting means is worse than a predetermined value.

  In this case, the reproduction signal quality such as jitter and error rate is often used as an index for defining the system margin of the optical disc, and the recording state can be matched with the margin regulation threshold of the optical disc. There is an effect.

  Further, when the predetermined condition is not satisfied, it can be considered that the value based on the signal amplitude of the reproduction signal detected by the reproduction signal detecting means is smaller than the predetermined value.

  In this case, by detecting the amplitude of the reproduction signal, the recording state can be detected with a simpler circuit configuration than the reproduction signal quality such as jitter and error rate.

  In another light modulation recording condition setting device according to the present invention, as described above, the recording condition setting means performs a predetermined operation on the recording conditions obtained by the test writing performed at least once by the test writing means. In addition, by setting the optimum recording condition using the recording pulse condition depending on the recording laser power or / and the erasing laser power obtained by this calculation, it is possible to reduce the deterioration of the reproduction signal quality. .

  In other words, within the range of low recording power conditions, test writing is performed by changing the recording power and erasing power, and various calculations are taken into consideration for the detected recording conditions, and a predetermined calculation such as multiplication by a predetermined coefficient is added to achieve the optimum. When setting the recording conditions, there is a problem that the quality of the reproduced signal may be deteriorated under a high recording laser power condition, but when the recording laser power is larger than the standard recording power, the recording pulse condition is changed. By changing the setting, it is possible to reduce the deterioration of the reproduction signal quality.

  As described above, the optical modulation recording condition setting device according to the present invention is such that the recording condition setting means adds a predetermined calculation to the recording condition recorded in advance on the optical disc, and the recording obtained by this calculation is performed. By setting the optimum recording condition using the recording pulse condition depending on the magnitude of the laser power or / and the erasing laser power, it is possible to reduce the deterioration of the reproduction signal quality.

  Therefore, it is possible to improve the reproduction signal quality when data is recorded under the optimum recording conditions.

  The recording condition setting means uses a reference disk having standard characteristics, and standardizes recording laser power and erasing laser power when the recording conditions determined by the reference apparatus having standard characteristics are standard recording conditions. When the recording laser power and the standard erasing laser power are used, the recording laser power obtained by the calculation and the standard recording laser power value or / and the erasing laser power obtained by the calculation and the standard erasing laser power value By comparing and setting the recording pulse condition based on the comparison result, it is possible to set the recording power condition with higher accuracy.

  Therefore, it is possible to improve the reproduction signal quality when data is recorded under the optimum recording conditions.

  As described above, the optical modulation recording / reproducing apparatus according to the present invention includes the above-described optical modulation recording condition setting apparatus, so that signal recording can be performed appropriately and the reproduction signal quality can be improved. There is an effect.

  As described above, the control program according to the present invention is a control program for operating the light modulation recording condition setting device, and a general-purpose computer by causing a computer to function as each unit in the light modulation recording condition setting device. Thus, the light modulation recording condition can be set.

  Therefore, the optical modulation recording condition setting device and the optical modulation recording / reproducing device including the optical modulation recording condition setting device can be manufactured at low cost without any special capital investment.

  The computer-readable recording medium according to the present invention records the control program as described above, so that the computer can read the control program.

  Therefore, it is possible to provide a computer-readable recording medium in which the control program is recorded. Therefore, it is possible to easily realize the light modulation recording condition setting apparatus using a highly versatile computer. As a result, the light modulation recording condition setting device can be realized at a lower cost.

Embodiment 1
One embodiment of the present invention will be described with reference to FIGS. 1 to 7 as follows.

  In the optical disk apparatus (light modulation recording / reproducing apparatus) 1 including the light modulation recording condition setting device to which the light modulation recording condition setting method of the present embodiment is applied, as shown in FIG. The control unit 20 moves the pickup 12 to the track via the pickup drive circuit 13. The optical disc 10 is a recording medium capable of performing optical modulation recording.

  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 standard recording conditions are recorded in advance in the setting area 41.

  The optical disc apparatus 1 reads the standard recording conditions in the setting area 41 and uses the standard recording conditions for setting the recording conditions. Further, the read standard recording conditions 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 light modulation recording condition setting method in the present embodiment will be described with reference to FIGS. 1 and 4 to 7. 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 systems, for example, the shortest recording mark length starts from 3T, and at this time, the shortest recording mark length is configured by a start end portion, an intermediate portion, and an end portion (for example, DVD-RW etc.). 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).

  The pulse train corresponding to the recording information is set in consideration of the medium temperature distribution for recording on the optical disc 10 as shown in FIG. 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 is a mark in which “1” is recorded in a time corresponding to four clock cycles, that is, a recording area.

  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 (referred to as recording pulse conditions) are recorded in advance in the setting area 41 of the optical disc 10 as recording pulse standard conditions.

  Next, using a test pattern including 2T mark to 8T mark, the reproduction signal quality when test writing was performed while changing the recording condition was measured. The measurement results are shown in FIG.

  The graph of FIG. 6 uses a recording power of 5.1 mW and an erasing power of 2.8 mW as standard recording conditions, and the recording power and the erasing power while maintaining a constant ratio (erasing power / recording power = 2.8 / 5.1). The result of measuring jitter and measuring the jitter as a detection amount of the reproduction signal quality is shown. Here, the solid line represents the case where recording was performed with the recording pulse condition set to the standard, and the dotted line represents the case where recording was performed by setting the pulse width at the start end and the intermediate portion increased by 1 ns from the standard. Yes. In either case, the jitter deteriorates near the high recording power. This is because both the recording power and the erasing power are increased, so that the cooling required for forming the recording mark is insufficient.

  Here, there is a difference in the recording power at which the deterioration of jitter occurs between the case of the standard pulse width and the case of increasing by 1 ns. For example, even if the recording power is 5.3 mW, which is a recording condition in which the jitter is good at the standard pulse width, the jitter deteriorates when the pulse width increases by 1 ns. In other words, the deterioration of the reproduction signal may occur under conditions close to the recording conditions that can form a good recording mark, and even if recording is performed under the recording conditions set as favorable conditions by trial writing, the environment in the apparatus The recording state may be deteriorated when a change or the like or a change in the recording pulse width occurs.

  The graph of FIG. 7 shows the result of jitter measurement when recording was performed by changing the length of the termination portion every 2 ns and changing the recording power and the erasing power so as to maintain a constant ratio among the recording pulse conditions. Yes. Here, the width of the recording pulse other than the terminal portion is set to a standard.

  Pay attention to deterioration conditions on the high power side. When the length of the end portion (period in which the bias power is irradiated in FIG. 4) is shorter than the standard condition by 2 ns (hereinafter referred to as the end portion-2 ns), a significant deterioration in jitter is observed at a recording power of 5.4 mW. Next, under the standard conditions, although the deterioration of jitter is observed from the recording power of 5.4 mW, the amount of deterioration is smaller than that of the termination portion -2ns. In addition, when the length of the end portion is 2 ns longer than the standard condition (hereinafter referred to as “end portion + 2 ns”), there is almost no deterioration in jitter at a recording power of 5.4 mW, which is greatly deteriorated at 5.5 mW. Finally, when the length of the terminal portion is 4 ns longer than the standard condition (hereinafter referred to as “terminal portion + 4 ns”), jitter deterioration is small at a recording power of 5.5 mW and greatly deteriorated at 5.7 mW. That is, it can be seen that as the length of the end portion is increased, the magnitude of the recording power at which jitter deteriorates increases.

  Therefore, when the recording power and the erasing power are large, the deterioration of the reproduction signal quality can be reduced and the recording condition can be improved by setting the end pulse width of the recording pulse condition to be large. Can be obtained. Here, for the sake of simplicity, the case where the recording power condition is large means that the recording power and erasure are larger than the recording power (hereinafter referred to as standard recording power) and the erasing power (standard erasing power) which are standard recording conditions. The power is not limited to this, but the same effect can be obtained if the recording power is higher than the power near the standard recording power.

  Here, a specific flow of operations for setting the recording conditions will be described below with reference to the flowchart shown in FIG. 1 and the block diagram shown in FIG.

  First, the optical disc apparatus 1 reads standard recording conditions from the optical disc 10 under the control of the control unit 20, and sets standard recording pulse conditions based on the standard recording conditions (S1).

  Subsequently, the recording power Pw and the erasing power Pe are changed and set (S2).

  Next, a comparison is made between the set recording power Pw and the standard recording power Pw0 (S3).

  Here, if Pw is equal to or greater than Pw0, the end of the recording pulse condition is set to be long (S4), and otherwise, the standard recording pulse condition is set.

  Next, trial writing is performed under the set recording conditions, and a reproduction signal is detected (S5).

  Thereafter, the end of the trial writing is determined (S6), and when the trial writing is continued, the process returns to S2, and the recording power is changed and set. When the trial writing is finished, optimum recording conditions are set based on the obtained reproduction signal (S7).

  In this example, the set recording power Pw is compared with Pw0, which is the standard recording power. However, the present invention is not limited to this, and the erasing power Pe may be compared with Pe0, which is the standard erasing power.

  As described above, in the light modulation recording condition setting method and the optical disc apparatus 1 according to the present embodiment, the recording condition test writing means performs test writing on the optical disc 10 while changing the recording conditions. The reproduction signal detecting means reproduces the information trial-written by the recording condition trial writing means and detects a reproduction signal. Further, the selection means selects a recording condition that improves the reproduction signal quality. That is, the selection unit is also a recording condition setting unit that sets a recording condition. The recording condition trial writing means, the reproduction signal detecting means, and the selecting means (recording condition setting means) are controlled by the control unit 20 including a CPU.

  That is, conventionally, there has been a problem that the reproduction signal quality may be deteriorated under a large recording condition.

  However, in the present embodiment, an optical modulation recording / reproducing apparatus that changes the recording conditions, performs trial writing on the optical disc, reproduces the trial-written information, and selects the recording conditions that provide good reproduction signal quality, and In the light modulation recording condition setting method, when the recording power is equal to or higher than the standard recording power, the recording pulse condition is changed to set the recording condition used for the test writing.

  That is, it is possible to reduce the influence of variations in characteristics of the writable optical disc 10 and the optical disc apparatus 1.

[Embodiment 2]
The following will describe another embodiment of the present invention with reference to FIGS. 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 light modulation recording condition setting method according to the present embodiment, trial writing is performed, information written by trial writing is reproduced, and when the reproduction signal does not satisfy a desired condition, the recording pulse condition is changed and used for the trial writing. Set the recording conditions.

  FIG. 8 shows the result of measuring the jitter as a detection amount of the reproduction signal quality by recording with the recording power and the erasing power changed while maintaining a constant ratio. Here, a jitter threshold A0 is used. That is, when trial writing is performed and a jitter worse than the threshold A0 is obtained, the recording pulse condition is reset and the trial writing is performed. At this time, if the set recording power Pw is larger than the standard recording power Pw0, the deterioration of the reproduction signal quality is reduced by setting the recording pulse condition so as to increase the pulse width at the end portion. Can do.

  FIG. 9 is a flowchart showing a specific operation for setting recording conditions.

  First, the optical disc apparatus 1 reads the standard recording condition from the optical disc 10 under the control of the control unit 20, and sets the standard recording pulse condition (S11). Subsequently, the recording power Pw and the erasing power Pe are changed and set (S12). Next, trial writing is performed under the set recording conditions, and a reproduction signal is detected (S13). When the reproduction signal satisfies a desired condition, here, it is determined whether the jitter is equal to or less than the threshold value A0 (S14), the end of the test writing is determined (S15), and the test writing is continued. Returning to S12, the recording condition is changed and set. If the jitter is larger than the threshold value A0, the end of the trial writing is determined (S16), the end of the recording pulse condition is set to be long (S17), the process returns to S13, and the set recording condition is set. Trial writing with. When the trial writing is finished, optimum recording conditions are set based on the obtained reproduction signal (S18).

  It should be noted that the processes after S14 in FIG. 9, that is, the process of determining whether the reproduction signal of the trial writing under the set recording condition satisfies the desired condition and changing the recording pulse condition based on the determination are performed. It can also be used after S6 in FIG.

  In the present embodiment, jitter is used as a condition of the reproduction signal, but the present invention is not limited to this, and an error rate or the like representing reproduction signal quality can be used.

  FIG. 10 shows the result of recording with the recording power and the erasing power changed while maintaining a constant ratio, and measuring the modulation degree as the detection amount of the reproduction signal. It can be seen that the degree of modulation decreases under high recording conditions so as to correspond to the deterioration of jitter. Therefore, the degree of modulation can also be used as a condition for the reproduction signal. Since the decrease in the modulation factor is caused by the decrease in the signal amplitude, the signal amplitude can also be used as the condition of the reproduction signal.

  That is, conventionally, there has been a problem that the reproduction signal quality may be deteriorated under a large recording condition.

  However, in the present embodiment, an optical modulation recording / reproducing apparatus that changes the recording conditions, performs trial writing on the optical disc, reproduces the trial-written information, and selects the recording conditions that provide good reproduction signal quality. In the optical modulation recording condition setting method, the recording power and the erasing power used for the trial writing are set, the trial writing is performed, the trial written information is reproduced, and if the reproduction signal does not satisfy the desired condition, the recording pulse In this configuration, recording conditions used for test writing are set by changing the conditions.

  That is, it is possible to reduce the influence of variations in characteristics of the writable optical disc 10 and the optical disc apparatus 1.

[Embodiment 3]
The following will describe still another embodiment of the present invention with reference to FIG. For convenience of explanation, members having the same functions as those shown in the drawings of Embodiments 1 and 2 are given the same reference numerals, and descriptions thereof are omitted.

  In the optical modulation recording pulse condition setting method of the present embodiment, the recording condition setting performed in the first to second embodiments is performed using the recording pulse condition obtained by the test writing performed at least once. It is the structure to perform.

  That is, since the recording pulse condition obtained by the test writing performed at least once is set as the standard recording pulse condition and the test writing can be performed by changing the recording condition, it is possible to set a better recording condition. .

  FIG. 11 is a flowchart showing a specific operation for setting recording conditions.

  First, the optical disc apparatus 1 performs a test writing operation at least once, and sets a recording pulse condition obtained by the test writing as a standard recording pulse condition (S21). Then, test writing is performed by proceeding to either S2 in the first embodiment or S12 in the second embodiment, and an optimum recording condition is set.

  That is, since the test writing can be performed by changing the recording condition based on the recording condition obtained by the test writing performed at least once, it is possible to set the recording power condition with better accuracy.

[Embodiment 4]
The following will describe still another embodiment of the present invention with reference to FIGS. 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 light modulation recording pulse condition setting method of the present embodiment, the recording power is standard in the method for setting the optimum recording condition by adding a predetermined calculation to the recording condition obtained by the trial writing performed at least once. When the recording power is larger, the recording condition is set by changing the recording pulse condition.

  In other words, in the range of low recording power conditions, test writing is performed by changing the recording power and erasing power, and various margins are taken into consideration for the detected recording conditions, and a predetermined calculation such as multiplication by a predetermined coefficient is added to make the optimum. When the recording conditions are set (FIG. 12), there is a problem that the reproduction signal quality may deteriorate under high recording conditions. However, when the recording power is larger than the standard recording power, the recording pulse condition Of these, the deterioration of the reproduction signal quality can be reduced by setting the pulse width of the terminal portion to be large.

  FIG. 13 is a flowchart showing a specific operation for setting recording conditions.

  First, the optical disc apparatus 1 performs a trial writing operation at least once, and multiplies each of the recording power and the erasing power, which are recording conditions obtained by the trial writing, by a predetermined coefficient, and sets the recording conditions (S31). Next, a comparison is made between the set recording power Pw and the standard recording power Pw0 (S32). Here, if Pw is equal to or greater than Pw0, the end portion of the recording pulse condition is changed and set to be long (S33). On the other hand, when the set recording power Pw is smaller than the standard recording power Pw0, the recording condition set in S31 is kept.

  That is, it is possible to reduce the influence of variations in characteristics of the writable optical disc 10 and the optical disc apparatus 1.

  In S31 of FIG. 13, the recording condition and the erasing power, which are the recording conditions obtained by the trial writing, are multiplied by a predetermined coefficient and set as the recording conditions, but the recording conditions recorded on the optical disc The same effect can be obtained by reading out and multiplying it by a predetermined coefficient and setting it as a recording condition.

  In the above embodiment, as a method for setting the recording condition for the trial writing using the recording pulse condition depending on the recording power or / and the erasing power, the recording power or / and the erasing power set in advance by the program is set. Although the method for controlling the recording condition of the trial writing using the value of the recording pulse condition is described, the dependency between the recording power or / and the erasing power and the recording pulse condition is limited to the above embodiment. For example, a method of accumulating the dependency of the recording power or / and erasing power and the recording pulse condition in a tabular format, and obtaining the recording pulse condition from the recording power or / and the erasing power in the table In addition, the recording power or / and erasing power is expressed by a function expression of the dependency of the recording power or / and erasing power on the recording pulse condition And a method for obtaining a recording pulse condition from the size.

  Further, FIG. 14 shows that when the pulse width of the start end portion and the intermediate portion is reduced by 1 ns among the standard conditions and the recording pulse conditions (hereinafter, pulse width −1 ns), the pulse width of the start end portion and the intermediate portion is reduced by 1 ns. As a result, when the length of the end portion is further increased by 2 ns (hereinafter referred to as pulse width-1 ns end portion + 2 ns), the result of jitter measurement when recording is performed while changing the recording power and the erasing power so as to maintain a constant ratio. Is shown.

  Here, under standard conditions, a significant deterioration in jitter is observed at a recording power of 5.5 mW. However, when the pulse width is −1 ns, no significant deterioration in jitter is observed at a recording power of 5.5 mW. Deteriorated at .7mW. Therefore, among the recording pulse conditions, when the pulse width at the starting end and the intermediate portion is reduced, the recording power and the erasing power under the recording power condition are large, as in the case where the pulse width at the end is increased. In this case, it can be seen that the deterioration of the reproduction signal quality can be reduced and good recording conditions can be obtained.

  Further, when the pulse width at the start end and the intermediate portion is reduced and the pulse width at the end is further increased, the recording power at which the jitter is greatly deteriorated is 5.9 mW, and the start end of the recording pulse conditions. Similar effects can be obtained by reducing the pulse widths of the intermediate and intermediate portions and increasing the length of the terminal portion.

  Further, the present 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.

  In the present embodiment, (1, 7) RLL has been described as an example of a modulation method. However, the present invention is not limited to this, for example, a method of EFM modulation for CD and 8-16 modulation for DVD. Even so, it is applicable.

  The mark length of the (1,7) RLL is 2T to 8T, but the two modulation schemes are 3T to 11T. In this case, the mark length shown in FIG. 5 may be changed from 2T to 8T from 3T to 11T.

  Thus, even if the mark length to be used is different, the present invention is applicable. Further, the present invention is not limited to the above-described two modulation schemes, and even if other modulation schemes are used, only the same difference is obtained, and the present invention can be applied.

  In the present embodiment, DVD-RW and DVD-R have been described as examples of the optical disk, but the present invention is not limited to this. For example, CD-R, CD-RW, DVD-RAM, MO, and the like are also included. The present invention can be applied to the next generation optical disc in the future. However, the MO is not limited to the magnetic field modulation recording method but limited to the one that uses the light modulation recording method.

  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.

  Further, the light modulation recording condition setting method of the present invention may have the following configuration.

  That is, the light modulation recording condition setting method of the present invention is a light that changes the recording conditions, performs trial writing on the optical disc, reproduces the trial written information, and selects a recording condition that provides good reproduction signal quality. The optical modulation recording condition setting method of the modulation recording / reproducing apparatus is characterized in that the recording condition for trial writing is set using a recording pulse depending on the magnitude of recording power or / and erasing power.

  The optical modulation recording condition setting method includes a step of comparing the recording power and the standard recording power or / and the value of the erasing power and the standard erasing power, adjusting the recording pulse condition based on the comparison result, and performing test writing. These recording conditions may be set.

  In the light modulation recording condition setting method described above, when the recording power is greater than or equal to the standard recording power, the recording pulse condition may be changed to set the recording condition used for test writing.

  Further, the light modulation recording condition setting method of the present invention is a light that changes the recording conditions, performs trial writing on the optical disc, reproduces the trial written information, and selects a recording condition that provides good reproduction signal quality. This is applied to the modulation recording / reproducing apparatus, sets the recording power and erasing power used for trial writing, performs trial writing, reproduces the trial written information, and if the reproduction signal does not satisfy the desired condition, the recording power Alternatively, the recording condition of the trial writing is set using a recording pulse condition depending on the magnitude of the erasing power.

  In the above-described optical modulation recording condition setting method, the recording power and erasing power used for trial writing are set, trial writing is performed, the trial written information is reproduced, and recording is performed when the reproduction signal does not satisfy the desired condition. A step of comparing power and standard recording power or / and erasing power and standard erasing power, and adjusting the recording pulse condition based on the comparison result to set the recording condition for trial writing Also good.

  Further, not satisfying the desired condition indicates that the reproduction signal quality is worse than the desired value.

  Further, “not satisfying the desired condition” means that the value based on the reproduction signal amplitude is smaller than the desired value.

  The optical modulation recording condition setting method of the present invention is a method for setting the optimum recording condition by adding a predetermined calculation to the recording condition obtained by the trial writing performed at least once. It is characterized in that the recording condition is set using a recording pulse condition depending on the magnitude of the recorded recording power and / or erasing power.

  Furthermore, the light modulation recording condition setting method of the present invention is a method for setting the optimum recording condition by adding a predetermined calculation to the recording condition recorded in advance on the optical disc, and the recording condition obtained by the calculation The recording condition is set using a recording pulse condition depending on the magnitude of power or / and erasing power.

  The optical modulation recording condition setting method includes a step of comparing the recording power obtained by the calculation and the standard recording power, and / or the value of the erasing power obtained by the calculation and the standard erasing power, based on the comparison result. Then, the recording condition may be set by adjusting the value of the recording pulse condition.

  In the light modulation recording condition setting method, the value of the standard recording pulse condition may be set based on a recording condition obtained by at least one trial writing.

  In the light modulation recording condition setting method described above, the standard recording pulse condition value may be set based on information recorded in advance on the optical disk.

  In the light modulation recording condition setting method, the recording pulse condition may be set by changing the pulse width of the terminal portion.

  Furthermore, in the above-described optical modulation recording condition setting method, the recording pulse condition may be set by changing the pulse width of the start end portion and / or the intermediate portion.

  Further, the optical modulation recording / reproducing apparatus for realizing the optical modulation recording condition setting method of the present invention includes a recording condition trial writing unit for changing the recording condition and performing trial writing on the optical disc, and a trial writing by the recording condition trial writing unit. In the optical modulation recording / reproducing apparatus comprising: a reproduction signal detecting means for reproducing the recorded information and detecting a reproduction signal; and a selection means for selecting a recording condition for improving the reproduction signal quality. Is characterized in that the recording or / and erasing conditions for trial writing are set using the recording pulse conditions depending on the magnitude of the recording power or / and the erasing power.

  In the optical modulation recording / reproducing apparatus, the recording condition test writing unit includes a comparison unit that compares the recording power and the standard recording power and / or the erasing power and the standard erasing power, and records based on the comparison result. It is also possible to adjust the pulse condition and set the test writing recording condition.

  In the light modulation recording / reproducing apparatus, when the recording power is equal to or higher than the standard recording power, the recording pulse condition may be changed to set the recording condition used for the trial writing.

  The optical modulation recording / reproducing apparatus of the present invention reproduces the recording condition trial writing means for performing trial writing on the optical disc by changing the recording conditions, the information trial-written by the recording condition trial writing means, and the reproduction signal. In the optical modulation recording / reproducing apparatus, the recording condition test writing means includes a recording power used for the trial writing. If the reproduction signal does not satisfy a desired condition, the recording pulse condition depending on the recording power or / and the erasing power is set. It is characterized in that the recording conditions for trial writing are set.

  In the optical modulation recording / reproducing apparatus, the recording condition trial writing means sets recording power and erasing power used for trial writing, performs trial writing, reproduces the trial written information, and a reproduction signal has a desired condition. Is not satisfied, it has a comparison means for comparing the values of the recording power and the standard recording power or / and the erasing power and the standard erasing power, and adjusting the recording pulse condition based on the comparison result, Recording or / and erasing conditions may be set.

  Further, not satisfying the desired condition indicates that the reproduction signal quality is worse than the desired value.

  Further, “not satisfying the desired condition” means that the value based on the reproduction signal amplitude is smaller than the desired value.

  The optical modulation recording / reproducing apparatus of the present invention reproduces the recording condition trial writing means for performing trial writing on the optical disc by changing the recording conditions, the information trial-written by the recording condition trial writing means, and the reproduction signal. In the optical modulation recording / reproducing apparatus including the reproduction signal detection means for detecting the recording signal and the selection means for selecting the recording condition that the reproduction signal quality is good, the selection means is obtained by trial writing performed at least once. When setting the optimum recording condition by adding a predetermined calculation to the recorded condition, recording and / or recording is performed using a recording pulse condition depending on the magnitude of the recording power or / and the erasing power obtained by the calculation. It is characterized by setting an erasing condition.

  Furthermore, the light modulation recording / reproducing apparatus of the present invention reproduces the recording condition trial writing means for performing trial writing on the optical disc by changing the recording conditions, the information trial-written by the recording condition trial writing means, and the reproduction signal. In the optical modulation recording / reproducing apparatus comprising: a reproduction signal detecting means for detecting the reproduction signal; and a selection means for selecting a recording condition for improving the reproduction signal quality, the selection means includes a recording condition recorded in advance on the optical disc. On the other hand, when the optimum recording condition is set by adding a predetermined calculation, the recording pulse condition depending on the magnitude of the recording power or / and the erasing power obtained by the calculation is set.

  The optical modulation recording / reproducing apparatus has a comparison means for comparing the value of the recording power obtained by the calculation and the standard recording power, and / or the value of the erasing power obtained by the calculation and the standard erasing power, based on the comparison result. Then, the recording condition may be set by adjusting the value of the recording pulse condition.

  In the optical modulation recording / reproducing apparatus, the value of the standard recording pulse condition may be set based on the recording condition obtained by the trial writing performed at least once.

  In the optical modulation recording / reproducing apparatus, the standard recording pulse condition value may be set based on information recorded in advance on the optical disc.

  In the above optical modulation recording / reproducing apparatus, the recording pulse condition may be set by changing the pulse width of the terminal portion.

  In the optical modulation recording / reproducing apparatus, the recording pulse condition may be set by changing the pulse width of the start end portion and / or the intermediate portion.

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

  The control program may be recorded on a computer-readable recording medium.

  The present invention is also applicable to DVD-RW, DVD-R, CD-R, CD-RW, DVD-RAM, MO, and the like as optical recording media for recording and reproducing information by an optical modulation method. Furthermore, it can be applied to future optical discs in the future. However, the MO is not limited to the magnetic field modulation recording method but limited to the one that uses the light modulation recording method.

It is a flowchart which shows the flow of a process of the optical modulation recording condition setting method in the optical modulation recording / reproducing apparatus concerning one embodiment of this invention. 1 is a block diagram of a schematic configuration of an optical modulation recording / reproducing apparatus according to an embodiment of the present invention. It is a perspective view which shows the optical disk in which information is recorded by the said optical disk apparatus. It is a figure explaining the setting of the pulse train corresponding to recording information. It is a figure explaining the setting of the pulse train corresponding to each mark length. It is a graph which shows the jitter measurement result in the said optical modulation recording condition setting method. It is a graph which shows the jitter measurement result in the said optical modulation recording condition setting method. It is a graph which shows the jitter measurement result in the said optical modulation recording condition setting method. It is a flowchart which shows other embodiment of the light modulation recording condition setting method in this invention. It is a graph which shows the measurement result of the modulation degree in the said optical modulation recording condition setting method. It is a flowchart which shows other embodiment of the light modulation recording condition setting method in this invention. It is a graph which shows the jitter measurement result in the said optical modulation recording condition setting method. It is a flowchart which shows other embodiment of the light modulation recording condition setting method in this invention. It is a graph which shows the jitter measurement result in the said optical modulation recording condition setting method.

Explanation of symbols

1. Optical disk device (light modulation recording / reproducing device)
DESCRIPTION OF SYMBOLS 10 Optical disk 11 Optical head 12 Pickup 13 Pickup drive circuit 14 Laser drive circuit 15 Reproduction circuit 20 Control part (Recording condition setting means, trial writing means, reproduction signal detection means)
30 sensor 41 setting area 42 user area A0 threshold Pe erasing power Pw recording power

Claims (25)

In response to a reproduction signal obtained by reproducing information written by trial by irradiation of a laser whose emission waveform is composed of one or more pulse trains on an optical disc capable of recording information by optical modulation, In a light modulation recording condition setting device for setting information recording conditions,
Recording condition setting means for setting recording conditions for trial writing on the optical disc;
Test writing means for performing test writing based on the recording conditions of test writing set by the recording condition setting means,
The recording condition setting means
An optical modulation recording condition setting device for setting a test writing recording condition using a recording pulse condition depending on a recording laser power and / or an erasing laser power. The recording condition setting means
The recording laser power and the erasing laser power are the standard recording laser power and the standard erasing laser when a standard disk having a standard characteristic is used and the recording condition determined by the standard device having the standard characteristic is the standard recording condition. When power and
The recording laser power and the standard recording laser power value or / and the erasing laser power and the standard erasing laser power value are compared, and the recording pulse condition is set based on the comparison result. The light modulation recording condition setting device according to claim 1. The recording condition setting means
3. A recording condition for trial writing is set using a recording pulse condition changed according to the recording laser power when the magnitude of the recording laser power is larger than the standard recording laser power. The light modulation recording condition setting device according to claim 1. The recording condition setting means
When the recording laser pulse includes a recording pulse, an erasing pulse, and a bias pulse,
When the recording laser power is larger than the standard recording laser power, a recording pulse condition in which the recording pulse width and / or the erasing pulse width is reduced or the bias pulse width is increased in accordance with the recording laser power. 3. The optical modulation recording condition setting apparatus according to claim 2, wherein the recording condition for trial writing is set using the optical modulation recording condition setting apparatus. The recording condition setting means
3. The recording condition for trial writing is set using a recording pulse condition that does not change according to the recording laser power when the recording laser power is smaller than the standard recording laser power. The light modulation recording condition setting device described. The recording condition setting means
When the recording laser power and the erasing laser power when the recording condition obtained by the test writing performed at least once is set as the standard recording condition, are set as the standard recording laser power and the standard erasing laser power,
The recording laser power and the standard recording laser power value or / and the erasing laser power and the standard erasing laser power value are compared, and the recording pulse condition is set based on the comparison result. The light modulation recording condition setting device according to claim 1.   3. The light modulation recording condition setting device according to claim 2, wherein the standard recording condition is set based on a recording condition recorded in advance on an optical disc. The recording condition setting means includes
2. The optical modulation recording condition setting device according to claim 1, wherein the recording pulse condition is set by changing a pulse width at a terminal portion of the recording pulse. The recording condition setting means
2. The optical modulation recording condition setting device according to claim 1, wherein the recording pulse condition is set by changing a pulse width of a start end portion and / or an intermediate portion of the recording pulse. In response to a reproduction signal obtained by reproducing information written by trial by irradiation of a laser whose emission waveform is composed of one or more pulse trains on an optical disc capable of recording information by optical modulation, In a light modulation recording condition setting device for setting information recording conditions,
Recording condition setting means for setting recording conditions for trial writing on the optical disc;
Trial writing means for performing trial writing based on the recording conditions for trial writing set by the recording condition setting means,
Reproduction signal detection means for reproducing information written by trial writing by the trial writing means and detecting a reproduction signal,
The recording condition setting means includes
When the signal quality of the reproduction signal detected by the reproduction signal detection means does not satisfy a prescribed condition, recording of trial writing using a recording pulse condition depending on the magnitude of the recording laser power and / or the erasing laser power An optical modulation recording condition setting device characterized by setting conditions. The recording condition setting means includes
The recording laser power and the erasing laser power are the standard recording laser power and the standard erasing laser when a standard disk having a standard characteristic is used and the recording condition determined by the standard device having the standard characteristic is the standard recording condition. When power and
When the signal quality of the reproduction signal detected by the reproduction signal detection means does not satisfy a predetermined condition, the value of the recording laser power and the standard recording laser power or / and the erasing laser power and the standard erasing laser power The optical modulation recording condition setting device according to claim 10, wherein the recording pulse condition is set based on the comparison result.   12. The optical modulation recording condition setting device according to claim 11, wherein when the predetermined condition is not satisfied, the signal quality of the reproduction signal detected by the reproduction signal detecting means is worse than a predetermined value. .   12. The optical modulation according to claim 11, wherein when the predetermined condition is not satisfied, a value based on a signal amplitude of the reproduction signal detected by the reproduction signal detecting unit is smaller than a predetermined value. Recording condition setting device. In response to a reproduction signal obtained by reproducing information written by trial by irradiation of a laser whose emission waveform is composed of one or more pulse trains on an optical disc capable of recording information by optical modulation, In a light modulation recording condition setting device for setting information recording conditions,
Recording condition setting means for setting recording conditions for trial writing on the optical disc;
Test writing means for performing test writing based on the recording conditions of test writing set by the recording condition setting means,
The recording condition setting means
A predetermined calculation is added to the recording conditions obtained by the trial writing performed at least once by the trial writing means, and the recording depends on the recording laser power or / and the erase laser power obtained by the calculation. An optical modulation recording condition setting apparatus, wherein an optimum recording condition is set using a pulse condition. In response to a reproduction signal obtained by reproducing information written by trial by irradiation of a laser whose emission waveform is composed of one or more pulse trains on an optical disc capable of recording information by optical modulation, In a light modulation recording condition setting device for setting information recording conditions,
Recording condition setting means for setting recording conditions for trial writing on the optical disc;
Test writing means for performing test writing based on the recording conditions of test writing set by the recording condition setting means,
The recording condition setting means includes
A predetermined calculation is added to the recording conditions prerecorded on the optical disc, and the optimum recording conditions are set using the recording pulse conditions depending on the magnitude of the recording laser power and / or the erasing laser power obtained by the calculation. An optical modulation recording condition setting device. The recording condition setting means
The recording laser power and the erasing laser power are the standard recording laser power and the standard erasing laser when a standard disk having a standard characteristic is used and the recording condition determined by the standard device having the standard characteristic is the standard recording condition. When power and
The recording laser power obtained by calculation and the standard recording laser power value or / and the erasing laser power obtained by calculation and the standard erasing laser power value are compared, and the recording pulse is calculated based on the comparison result. The light modulation recording condition setting device according to claim 14 or 15, wherein the condition is set. Information to the optical disc can be recorded in accordance with a reproduction signal obtained by reproducing information written on a trial basis by irradiating a laser having one or more pulse trains with a light emission waveform on an optical disc capable of recording information by optical modulation. In the light modulation recording condition setting method for setting the recording condition of
A light modulation recording condition setting method, characterized in that a recording condition for trial writing is set using a recording pulse condition depending on the magnitude of the recording laser power or / and the erasing laser power. The recording laser power and the erasing laser power are the standard recording laser power and the standard erasing laser when a standard disk having a standard characteristic is used and the recording condition determined by the standard device having the standard characteristic is the standard recording condition. When power and
Compare the values of the recording laser power and standard recording laser power, or / and the erase laser power and standard erase laser power, adjust the recording pulse conditions based on the comparison results, and test-write using the adjusted recording pulse conditions 18. The light modulation recording condition setting method according to claim 17, wherein the recording condition is set.   19. The recording condition for test writing is set using the recording pulse condition after changing the recording pulse condition when the magnitude of the recording laser power is equal to or greater than the standard recording laser power. The light modulation recording condition setting method described. Information to the optical disc can be recorded in accordance with a reproduction signal obtained by reproducing information written on a trial basis by irradiating a laser having one or more pulse trains with a light emission waveform on an optical disc capable of recording information by optical modulation. In the light modulation recording condition setting method for setting the recording condition of
When trial writing is performed under arbitrary trial writing recording conditions, and the reproduction signal that reproduces the trial written information does not satisfy the predetermined condition that defines the signal quality,
A light modulation recording condition setting method, characterized in that a recording condition for trial writing is set using a recording pulse condition depending on the magnitude of the recording laser power or / and the erasing laser power. Predetermined calculation based on a reproduction signal obtained by reproducing information written on a trial basis at least once by irradiating a laser with one or more pulse trains of light emission waveform to an optical disc capable of recording information by optical modulation In the light modulation recording condition setting method for setting the optimum recording condition of information on the optical disc,
An optical modulation recording condition setting method, wherein an optimum recording condition is set using a recording pulse condition depending on a recording laser power or / and an erasing laser power obtained by calculation. Optical modulation recording conditions for setting an optimum recording condition of information on the optical disc by performing a predetermined calculation on the recording conditions pre-recorded on the optical disc for an optical disc capable of recording information by optical modulation In the setting method,
An optical modulation recording condition setting method, wherein an optimum recording condition is set using a recording pulse condition depending on a recording laser power or / and an erasing laser power obtained by calculation.   An optical modulation recording / reproducing apparatus comprising the optical modulation recording condition setting apparatus according to claim 1.   A control program for operating the light modulation recording condition setting device according to any one of claims 1 to 16, wherein the control program causes a computer to function as each means in the light modulation recording condition setting device. .   A computer-readable recording medium on which the control program according to claim 24 is recorded.

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