JP2007213731A - Optical information recording unit and optical information recording method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical information recording/reproduction unit and an optical information recording method, in which highly accurate write strategy can be set in a short time period even in high speed recording. <P>SOLUTION: Information including a plurality of kinds of marks is test-recorded onto an optical recording medium according to predetermined write strategy, then the test-recorded information is read, so that a binary reproduction signal depending on a mark and a space is generated. A clock having a predetermined frequency is generated, and a lag between edge timing and the clock is detected for each mark edge at which a value is changed in the generated reproduction signal. Then, the predetermined write strategy is corrected for each mark such that each lag detected for each edge has the same value. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an optical information recording apparatus and an optical information recording method for setting a suitable write strategy for recording information on an optical recording medium.

  In recent years, due to the development of information communication technology, the Internet and the like have been spread at a remarkable speed, so that a lot of information is exchanged over a network. Under these circumstances, in recent years, in the field of information recording apparatuses, a write-once optical disc such as a CD-R and a rewritable optical disc such as a CD-RW have attracted attention as recording media. In recent years, DVD ± R and DVD ± RW have been developed by shortening the wavelength of a semiconductor laser as a laser light source, reducing the spot diameter by a high NA objective lens having a high numerical aperture, and adopting a thin substrate. A large-capacity optical disk such as a DVD-RAM is used in an information recording apparatus.

Here, recording of information on a CD-R or the like is performed by converting recording information given from a PC (PC: Personal Computer) or the like into an EFM (EFM: Eight to Fourteen Modulation) signal. Due to the difference in the composition of the recording layer and the like, problems such as poor mark formation due to insufficient heat storage and cooling rate of the optical recording medium occur. I can't do it.
For this reason, a method has been adopted in which a recording parameter specific to each optical disc to be used (hereinafter referred to as a write strategy) is determined and a good recording quality is maintained with respect to a reference recording waveform. In order to determine the write strategy specific to each optical disc, the burden on the developer is large, and it is difficult to cope with the write strategy for the optical information recording medium that is released after the development of the information recording apparatus. is there.

In response to these problems, information is recorded on the optical disc using a reference write strategy, and the recorded information is reproduced to obtain the recording length of each mark or space. A technique for automatically generating a suitable write strategy by adjusting the rising or falling edge position of each recording pulse corresponding to each mark or space so that the amount of deviation is minimized (see, for example, Patent Document 1). In addition to these techniques, the front side phase shift amount or the rear side phase shift amount of each mark is calculated to determine the recording length shift direction with respect to the theoretical length for each mark, which is a suitable write strategy. There has been proposed a technology for automatically setting (see, for example, Patent Document 2).
JP 2002-230770 A JP 2004-355727 A

  However, in the former method, for example, even if the focus is set on the mark and the write strategy is set so that the recording length matches the theoretical length, it is not possible to know how much the front edge and the rear edge of the mark are shifted. In addition, there is a problem that the recording length of the space located before and after the mark varies with respect to the theoretical length.

  Further, in the latter method, there is a problem that the processing time becomes long because a process of comparing the amount of deviation occurs for each of the preceding and following marks and spaces. Further, when adjusting the edge of the recording pulse, the influence on only the mark edge position corresponding to the recording pulse edge to be adjusted is considered, and further, the influence on the edge position of the adjacent mark is not considered. However, there is a problem that it is difficult to set a high-accuracy write strategy in high-speed recording with large thermal interference between marks and spaces, or in the case of particularly short signals such as 3T and 4T.

  Therefore, the present invention has been made in view of the above problems, and by calculating a deviation amount from the rising edge and the falling edge of the recording length with respect to the theoretical length of the mark and space by a simple method, An object of the present invention is to provide an optical information recording apparatus and an optical information recording method capable of setting a high-accuracy write strategy in a short time even in the case of high-speed recording or a particularly short signal such as 3T or 4T.

In order to solve the above problems, the present invention proposes the following matters.
The invention according to claim 1 generates recording pulse light according to a predetermined write strategy, and irradiates the generated recording pulse light to the optical recording medium to form an array of marks and spaces on the optical recording medium. An optical information recording apparatus for recording information including a plurality of types of marks on the optical recording medium according to the predetermined write strategy, and a test recording means for testing the optical recording medium with the test recording means. Reads recorded information and generates a reproduction signal having a binary value corresponding to the mark and space, a clock generation means for generating a clock having a predetermined frequency, and a reproduction generated by the reproduction signal generation means For each edge of each mark whose value changes in the signal, the timing of the edge and the previous timing generated by the clock generation means Detecting means for detecting a deviation from a clock; and a correcting means for correcting the predetermined write strategy for each mark so that all the deviations detected for each edge by the detecting means coincide with each other. Has been proposed.

  According to a twelfth aspect of the present invention, a recording pulse light is generated according to a predetermined write strategy, and the generated recording pulse light is irradiated onto the optical recording medium to form an array of marks and spaces on the optical recording medium. A first step of test recording information including a plurality of types of marks on the optical recording medium according to the predetermined write strategy, and information recorded on the optical recording medium by test recording A second step of generating a binary reproduction signal corresponding to the mark and space, a third step of generating a clock of a predetermined frequency, and each mark whose value is switched in the generated reproduction signal For each edge, a fourth step of detecting a deviation between the timing of the edge and the clock, and the deviation detected for each edge To match Te proposes an optical information recording method characterized by and a fifth step of correcting the predetermined write strategy for each of the mark.

  According to these inventions, according to a predetermined write strategy, information including a plurality of types of marks is test-recorded on the optical recording medium, the test-recorded information is read, and a binary reproduction signal corresponding to the mark and space is obtained. Generate. Further, a deviation between the edge timing and the clock is detected for each edge of each mark whose value changes in the generated reproduction signal. Then, the predetermined write strategy is corrected for each mark so that all the detected deviations for each edge coincide. Therefore, it is possible to detect the theoretical recording length of each mark by the deviation from the clock and to correct the deviation so that all the deviations coincide with each other, so that an accurate write strategy can be set without complicated measurement processing. Can do.

  According to a second aspect of the present invention, in the optical information recording apparatus according to the first aspect, for each edge of each mark, a write strategy is set that changes only a predetermined amount of the timing of the edge with respect to the predetermined write strategy. The timing of the edge in the reproduction signal obtained by reading the information recorded according to the set write strategy and the corresponding edge in the reproduction signal obtained by reading the information recorded according to the predetermined write strategy A change amount includes storage means stored in advance as the inherent change amount of the edge, and the correction means determines the correction amount of the predetermined write strategy based on the inherent change amount stored in the storage means. An optical information recording apparatus characterized by this is proposed.

  According to a third aspect of the present invention, in the optical information recording apparatus according to the second aspect, the inherent change amount stored in the recording means depends on the type of the optical recording medium, the recording speed, and the RF signal correction settings. An optical information recording apparatus characterized by setting a predetermined value is proposed.

  According to a fourth aspect of the present invention, there is provided the optical information recording apparatus according to the first aspect, wherein the test recording unit applies only a predetermined amount of the timing of the edge to the predetermined write strategy for each edge of each mark. A write strategy to be changed is set, and test recording is further executed according to the set write strategy, and the correction means changes the timing of the edge by a predetermined amount by the test recording means for each edge of each mark. The amount of change in timing between the edge in the reproduction signal obtained by reading the information recorded in accordance with the write strategy and the corresponding edge in the reproduction signal obtained by reading the information recorded in accordance with the predetermined write strategy Obtained as an intrinsic change amount of the edge, and based on the obtained intrinsic change amount, It proposes an optical information recording apparatus characterized by determining a correction amount of the write strategy.

  According to a fifth aspect of the present invention, in the optical information recording apparatus according to the second or fourth aspect, the inherent change amount of each of the edges is the edge whose timing is shifted by the predetermined amount by the setting of the write strategy, and There has been proposed an optical information recording apparatus including the amount of change in timing of each edge adjacent to the edge and the mark.

  According to a sixth aspect of the present invention, in the optical information recording apparatus according to the fifth aspect, when the amount of change in the timing of each of the adjacent edges sandwiching the edge mark shifted by the predetermined amount is included, the signal is a short signal. An optical information recording apparatus characterized by the above is proposed.

  According to a seventh aspect of the present invention, in the optical information recording apparatus according to the second or fourth aspect, an inherent change amount of each edge is determined for each combination of a mark and a space sandwiching the edge, and the write It includes the amount of change in timing of each of the edge with the timing shifted by the predetermined amount in the strategy setting, the edge adjacent to the edge and the mark, and the edge adjacent to the edge and the space. An optical information recording apparatus is proposed.

  According to an eighth aspect of the present invention, in the optical information recording apparatus according to the seventh aspect, the timing of each of the edge shifted by the predetermined amount and the edge adjacent to the mark and the edge adjacent to the edge and the space. The optical information recording apparatus has been proposed in which the change amount is included in the case of a short signal.

  The invention according to claim 9 is the optical information recording apparatus according to claim 5 or 7, wherein the reproduction signal generation means generates information recorded by the predetermined write strategy, and the recording quality of the reproduction signal is determined. An optical information recording apparatus characterized by measuring and determining a write strategy to be used and its setting order based on values calculated from data of these reproduction signals.

  According to a tenth aspect of the present invention, in the optical information recording apparatus according to the ninth aspect, when the recording quality test-recorded by the predetermined write strategy is good, the optical information recording apparatus is based on the inherent change amount according to the seventh aspect. The correction amount of a predetermined write strategy is obtained, and when the recording quality is low, the inherent change according to claim 7 after correction with the correction amount of the predetermined write strategy based on the inherent change amount according to claim 5 An optical information recording apparatus is proposed in which a correction amount of the predetermined write strategy is determined based on the amount.

  According to an eleventh aspect of the present invention, in the optical information recording apparatus according to the ninth aspect, the recording quality of the predetermined write strategy is determined by determining a sample ratio, a jitter value, and a deviation value of the signal reproduced by the reproduction signal means. An optical information recording apparatus characterized by using any one or more of them is proposed.

  According to the present invention, by calculating the amount of deviation from the rising edge and falling edge of the recording length with respect to the theoretical length of the mark and space by a simple method, a particularly short signal such as 3T or 4T can be obtained even during high-speed recording. Even in this case, there is an effect that a highly accurate write strategy can be set in a short time.

<First Embodiment>
The quality of a write strategy used for recording information on an optical recording medium is generally evaluated by reproduction jitter. As a technique for optimizing the reproduction jitter, a method of adjusting the write strategy so that the recording length of each mark and space recorded on the optical recording medium matches the theoretical length can be considered. Specifically, marks and spaces are recorded by using the standard write strategy of the optical recording medium, and the recorded lengths of the respective marks and spaces are obtained by reproducing the marks and spaces. The respective recording pulse widths constituting the write strategy are adjusted.

  However, as shown in FIG. 3, for example, when the trailing edge of the recording pulse corresponding to the 3T mark is changed by a certain amount, the effect of this change is the corresponding edge of the recorded 3T mark (B edge in FIG. 3). ) As well as an edge opposite this edge (A edge in FIG. 3). FIG. 4 shows how the A and B edges in FIG. 3 change when the amount of change added to the falling edge of the recording pulse corresponding to the 3T mark in FIG. 3 is increased or decreased. As can be seen from the above, changes in the A edge and the B edge are proportional to the increase or decrease in the amount of change added to the falling edge of the recording pulse corresponding to the 3T mark, and change almost linearly.

  That is, for example, even if the recording pulse width corresponding to the 3T mark is adjusted and the recording length of the 3T mark is adjusted to the theoretical length of the 3T mark, the influence of adjusting the recording pulse width corresponding to the 3T mark is as described above. As described above, since it occurs at both edges of the 3T mark, the effect of adjusting the recording pulse width corresponding to the 3T mark affects the space etc. adjacent to the 3T mark, and as a result, the overall reproduction jitter is not improved. Will occur. Therefore, in order to set a highly accurate write strategy, it is necessary to consider not only the recording mark edge corresponding to the edge portion of the recording pulse to be changed, but also the influence on the opposite edge.

  Therefore, in the present embodiment, using the clock signal extracted from the reproduction signal, the amount of deviation between the reproduction pulse signal corresponding to the recorded mark and the clock signal is detected, and both edges of the currently recorded mark are detected. Find out how much it deviates from both edges of the original mark. Then, in the reference write strategy, for example, both edges of the 3T mark that should be originally formed when both the rising edge and the falling edge of the 3T mark are changed by a predetermined amount are used as the deviation amounts. More specifically, the amount of deviation from the mark is used to make the deviation amount constant for all marks and spaces, and more specifically, the timing of the edges of all marks and spaces is clocked. On the other hand, the present invention is characterized in that a write strategy is corrected and a suitable write strategy is set by shifting the whole so as to be shifted by the same amount.

  Hereinafter, the optical information recording apparatus according to the present embodiment will be described in detail with reference to FIGS. 1, 2, and 5. As shown in FIG. 1, an optical information recording apparatus according to this embodiment includes an optical disc (optical recording medium) 1, an optical pickup 2, a head amplifier 3, and a data decoder (reproduction signal generating means, clock signal generating means). 4, a difference detection unit (detection unit) 5, a ROM 6, a RAM 7, a write strategy setting unit (correction unit) 8, a control unit (test recording unit) 9, a recording pulse train correction unit 10, and a controller 11 And a data encoder 12 and a laser driving unit 13.

  The optical disk 1 is an optical recording medium capable of recording and reproducing information by a laser diode, and is, for example, a DVD ± R. The optical pickup 2 includes a laser light source such as a laser diode (not shown), an objective lens driven by a collimator lens, a focus actuator or a tracking actuator, an optical component such as a polarization beam splitter, a cylindrical lens, and A, B, C, and D. Are divided into four regions, and a four-divided or two-divided photodetector (PD) for converting light into an electric signal, a front monitor diode for monitoring laser output during recording and reproduction, and the like are provided.

  The head amplifier 3 detects the reflected light from the optical disk 1, calculates the reflected light amount from the detected reflected light, generates an RF signal indicating the sum of the reflected light amount to each area of the four-divided PD, and the optical pickup A focus error signal (FE) that is a signal for detecting the defocus of the irradiation laser 2 is generated by the astigmatism method, and a tracking error signal (TE) that is a signal for detecting the track shift of the irradiation laser of the optical pickup 2 Is generated by the push-pull method.

The data decoder 4 generates a binarized signal from the RF signal generated in the head amplifier 3, further converts it into a signal of a desired format, and outputs it to the controller 11. Further, a clock signal is extracted from the generated binarized signal.
The difference detection unit 5 receives the binarized signal and the clock signal from the data decoder 4, and for each mark, reproduces the theoretical pulse signal edge of each mark determined by the clock signal and the corresponding mark in the binarized signal. A difference value between the rising edge of the pulse signal and a difference value between the edge of the theoretical pulse signal and the falling edge of the reproduction pulse signal is detected. This difference value corresponds to the “deviation amount from the clock signal”.

  The ROM 6 is a non-rewritable storage device, and stores a control program for controlling the entire optical information recording device, a reference write strategy, and the like. Further, in the present embodiment, an inherent change amount (details will be described later) for each mark used for making all the difference values of the marks detected by the difference detection unit 5 constant values are also stored. Yes. The RAM 7 is a rewritable storage device, and temporarily stores a difference value for each mark detected by the difference detection unit 5 and a write strategy set by the write strategy setting unit 8.

  The write strategy setting unit 8 uses the correction value for each mark stored in the ROM 6 to calculate the difference value of each mark detected by the difference detection unit 5 so that all the values become a constant value. Set the right write strategy. The write strategy setting unit 8 also has a function of calculating the edge shift in the reference write strategy and a function of calculating the influence of the corresponding edge and the adjacent edge. The controller 9 controls the entire optical information recording apparatus according to a control program stored in the ROM 6.

  The recording pulse train correction unit 10 receives a write strategy or parameter from the control unit 9, forms a recording pulse train based on the write strategy or parameter, and outputs the recording pulse train to the laser driving unit 13. The controller 11 is a device that supplies a recording signal to the data encoder 12 and reads out the recording signal from the data decoder 4. The data encoder 12 converts the recording signal from the controller 11 into an EFM signal or the like to correct a recording pulse train. To the unit 10. The laser drive unit 13 generates a pulse signal for driving a laser diode corresponding to the input recording pulse, and supplies this to a semiconductor laser (not shown) in the optical pickup 2.

Next, a processing flow in the present embodiment will be described with reference to FIG.
First, the control unit 9 reads parameters relating to the reference write strategy from the ROM 6 and sets these parameters in the recording pulse train correction unit 10. The recording pulse train correction unit 10 generates a recording pulse train based on the set parameters and outputs the recording pulse train to the laser driving unit 13. The laser drive unit 13 generates a pulse signal for driving a laser diode corresponding to the recording pulse corresponding to the input reference write strategy, and supplies the pulse signal to a semiconductor laser (not shown) in the optical pickup 2, whereby the optical disk 1. Marks and spaces are recorded in the test writing area (step 101).

  When the mark and space recording is completed, the control unit 9 moves the optical pickup 2 to the recording track in the test writing area and reproduces information. The signal read by the optical pickup 2 is input to the data decoder 4 through the head amplifier 3 to generate a binarized signal. Further, the data decoder 4 extracts a clock signal from the binarized signal. The binarized signal and the clock signal generated in the data decoder 4 are input to the difference detector 5 and correspond to the theoretical length of each mark determined by the reproduction pulse signal and the clock signal corresponding to each mark such as 3T, 4T, and 5T. A difference value from the theoretical pulse signal to be detected is detected as a difference value between both edges of each pulse signal, and the value is stored in the RAM 7 (step 102).

  Next, the write strategy setting unit 8 reads the difference values (for example, DL3, DT3, DL4, DT4 in FIG. 5) detected by the difference detection unit 5 from the RAM 7. Further, as shown in FIG. 5 from the ROM 6, for example, the amount of change at both edges of the reproduction pulse signal when the rising edge of the recording pulse of the 3T mark is changed by the minimum controllable resolution (FL3, FT3 in FIG. 5). (4T mark is FL4, FT4, and so on for other marks) The change at both edges of the playback pulse signal when the falling edge of the recording pulse of the 3T mark is changed by the minimum controllable resolution The inherent change amount of each mark, which is a quantity (RL3, RT3 in FIG. 5; RL4, RT4 for the 4T mark, and so on for other marks) is read out.

Based on these values, the difference values between both edges of the theoretical pulse signal corresponding to the theoretical length of each mark determined by the reproduction pulse signal and clock signal corresponding to each mark are all the same value k. The simultaneous equations shown below are solved to determine the values of n1, n2, n3,... (Step 103).
DL3- (FL3 * n1 + RL3 * n2) = k
DT3- (FT3 * n1 + RT3 * n2) = k
DL4- (FL4 * n3 + RL4 * n4) = k
DT4- (FT4 * n3 + RT4 * n4) = k
・
・
・
When the influence of thermal interference from adjacent marks is small, the values of n1, n2, n3... Can be obtained by solving the following simultaneous equations as an effect of only the changed edge.
DL3-FL3 * n1 = k
DT3-RT3 * n2 = k
DL4-FL4 * n3 = k
DT4-RT4 * n4 = k
・
・
・

  When the values of n1, n2, n3,... Are obtained from the above equation, this becomes the adjustment amount of the rising edge and falling edge of the recording pulse corresponding to each mark with respect to the reference write strategy. The determined write strategy is stored in the RAM 7, and mark and space recording operations are executed using the stored write strategy (step 104).

  In this embodiment, for each mark, only the rising amount of the recording pulse of the mark is changed by the minimum resolution, and the amount of change at both edges of the reproduction pulse signal or only the rising edge is changed by the minimum resolution. In the above description, the amount of change at both edges of the reproduced pulse signal is calculated. These values are obtained by actually recording the above-described marks on the optical recording medium to be used. You may make it obtain | require from a reproduction | regeneration pulse signal.

  As described above, in this embodiment, when the recording pulse signal edge of a specific mark is changed, a difference value generated between both edges of the reproduction pulse signal and the clock signal corresponding to each mark is obtained, and each mark is obtained. By using this characteristic change amount, an arithmetic expression is set so that the difference value becomes a constant value for all marks, and the write strategy is set by solving the arithmetic expression. Therefore, a highly accurate write strategy is shortened. Can be set by time.

<Second Embodiment>
In the first embodiment, paying attention to a specific mark, if the rising edge or falling edge of the recording pulse signal corresponding to the specific mark is changed by a predetermined amount, the influence is caused by the rising edge and falling edge of the reproduction pulse signal. Said what will appear in. However, in practice, as shown in FIG. 6, when the rising edge or falling edge of the recording pulse signal corresponding to a specific mark is changed by a predetermined amount, the effect is only on the rising edge and falling edge of the reproduction pulse signal. It also extends to adjacent marks across a space.

  FIG. 6 shows the effect on the recorded mark when the falling edge of the recording pulse signal corresponding to the 3T mark is changed by a predetermined amount in the combination of the 3T mark and the 3T space. According to this figure, the influence is not only both edges (A edge and B edge in the figure) of the mark corresponding to the recording pulse signal whose edge is changed, but also the edge of the mark adjacent to the space (FIG. It can be seen that this also extends to the C edge.

  FIG. 7 shows changes in the A edge, B edge, and C edge when the amount of change in the falling edge of the recording pulse signal corresponding to the 3T mark in FIG. 6 is increased or decreased. As can be seen, the degree of change in the A edge, B edge, and C edge is proportional to the increase or decrease in the amount of change in the falling edge of the recording pulse signal corresponding to the 3T mark, and has almost linearity. Recognize.

  For these reasons, if a more precise write strategy is to be set, it is necessary to grasp the object of adjustment as a combination of a specific mark and a space, not a specific mark. Thus, the present embodiment is characterized in that the adjustment target for the write strategy setting is a combination of a specific mark and space.

Hereinafter, the optical information recording apparatus according to the present embodiment will be described in detail with reference to FIGS.
The basic configuration of the optical information recording apparatus according to the present embodiment is the same as the configuration of the optical information recording apparatus according to the first embodiment shown in FIG. 1, but the adjustment target for the write strategy setting is selected. In order to obtain a combination of a specific mark and space, the difference detection unit 5 detects the difference value for each combination of the specific mark and space and the combination of space and mark. The ROM 6 stores correction values and the like that are used to set all the difference values for the specific mark and space combinations detected by the difference detection unit 5 to constant values. The RAM 7 stores the difference detection unit 5. The difference value for each combination of the specific mark and space detected in step 1, the write strategy set in the write strategy setting unit 8, and the like are temporarily stored.

Next, a processing flow in the present embodiment will be described with reference to FIG.
First, the control unit 9 reads parameters relating to the reference write strategy from the ROM 6 and sets these parameters in the recording pulse train correction unit 10. The recording pulse train correction unit 10 generates a reference write strategy based on the set parameters, and outputs this to the laser drive unit 13. The laser drive unit 13 generates a pulse signal for driving a laser diode corresponding to the recording pulse corresponding to the input reference write strategy, and supplies the pulse signal to a semiconductor laser (not shown) in the optical pickup 2, whereby the optical disk 1. Marks and spaces are recorded in the test writing area (step 201).

  When the mark and space recording is completed, the control unit 9 moves the optical pickup 2 to the recording track in the test writing area and reproduces information. The signal read by the optical pickup 2 is input to the data decoder 4 through the head amplifier 3 to generate a binarized signal. Further, the data decoder 4 extracts a clock signal from the reproduction signal. The binarized signal and the clock signal generated in the data decoder 4 are input to the difference detection unit 5, and a reproduction pulse signal and a clock signal corresponding to each mark such as 3T, 4T, and 5T in a specific mark / space combination. A difference value from the theoretical pulse signal corresponding to the determined theoretical length of each mark is detected as a difference value between both edges of each pulse signal, and the value is stored in the RAM 7 (step 202).

  Next, the write strategy setting unit 8 reads the difference value (for example, DT (m, n), DL (m, n) in FIG. 8) detected from the RAM 7 by the difference detection unit 5. Further, as shown in FIG. 8 from the ROM 6, for example, when the trailing edge of the recording pulse signal of the mT mark in the combination of the mT mark and the nT space is changed by the minimum resolution (Ra (m in FIG. 8 , N), Rb (m, n), Rc (m, n)), the reproduction pulse signal when the rising edge of the recording pulse signal after mT space in the combination of mT space and nT mark is changed by the minimum resolution. The inherent change amount that is the change amount (Fa (m, n), Fb (m, n), Fc (m, n) in FIG. 8) at both edges is read out.

  Then, based on these values, simultaneous equations are constructed in the same manner as in the first embodiment so that the difference values obtained in step 202 all become the same value k, and this is solved, and n1, n2, n3 ... Is obtained (step 203). When the influence of thermal interference from adjacent marks is small, only the edges that have changed are used as the effects of only the edges Rb (m, n) and Fb (m, n), and the clock edges, marks, and spaces are used. It is also possible to obtain n1, n2, n3... So that the edge difference values have the same value (k).

  When the values of n1, n2, n3,... are obtained, this becomes the adjustment amount of the rising edge and falling edge of the recording pulse corresponding to each mark with respect to the reference write strategy. The determined write strategy is stored in the RAM 7, and mark and space recording operations are executed using the stored write strategy (step 204).

  In the present embodiment, when a specific mark / space combination is changed, only the rising edge of the mark recording pulse signal is changed by the minimum resolution or only the falling edge is changed by the minimum resolution. However, these values may be obtained from the reproduction pulse signal of the recorded mark or the like by actually recording the mark or the like on the optical recording medium to be used. Good.

  As described above, in the present embodiment, since the adjustment target is a combination of a specific mark and a space, a more accurate write strategy can be set in a short time.

  10 and 11 show the effect of the present invention. FIG. 10 shows the jitter value of a mark according to the write strategy setting method in various CD-R media and recording speeds. The jitter value of the space is shown. In FIG. 10 and FIG. 11, “Default”, “1-edge method”, “2-edge method”, and “3-edge method” indicate the types of write strategy, and the write strategy of “Default” Is a write strategy of the form (n−k) T, for example, and is a write strategy that is not corrected at all with a specific mark, space, or combination of mark and space. The write strategy of the “one edge method” is that the rising edge and falling edge of the recording pulse corresponding to the mark can be adjusted. When adjusting the edge in a specific recording pulse, only the corresponding edge is adjusted. This write strategy is based on the write strategy setting method considering the influence of the change. The “2-edge method” write strategy is a write strategy corresponding to the first embodiment, and the “3-edge method” write strategy is a write strategy corresponding to the second embodiment.

  From FIG. 10 and FIG. 11, the “1-edge method”, “2-edge method”, and “3-edge method” generally have lower jitter values than “Default”. In particular, when the recording speed increases, the tendency becomes remarkable. In addition, the “three-edge method” shows an extremely good result as compared with other methods even when viewed comprehensively.

  By the way, as a result of performing various tests after the filing of the present application, the applicant of the present application has found that there are cases where it is appropriate to perform correction by the “three-edge method” when the reference write strategy is changed, and cases where it is not. FIG. 12 shows “Default”, “2-edge method”, “3-edge method”, and “2-edge method” when the standard write strategy is WS-1, WS-2, WS-3, and WS-4. It is the graph which showed the jitter value (%) when the 3 edge method is performed after performing (2 edge method-> 3 edge method).

  That is, FIG. 12 intentionally changes the reference write strategy (Default) and compares the effects. As is clear from this, when the recording quality in the reference write strategy is poor, the “two-edge method” is used. It can be seen that the effect is large, and if it is good, the effect of the “three-edge method” is large. Therefore, it is understood that it is sufficient to determine whether the “3-edge method” is used alone or the “2-edge method → 3-edge method” is continuously used according to the recording quality of the reference write strategy.

  In general, the “two-edge method” adjusts the front and rear edges of the recording pulse for each type of mark, so the setting accuracy is somewhat rough, but the recording state in the base strategy is somewhat poor. However, there is a characteristic that a certain degree of effect can be obtained. In contrast, the “3-edge method” performs detailed strategy setting for each combination of mark and space, so a good result can be obtained if the recording state of the reference write strategy is good, but the recording state of the reference write strategy is If it is bad, there is a drawback that the ability cannot be fully demonstrated.

  For this reason, after recording with the reference write strategy, the recording quality is measured, and based on the result, it is sufficient to determine whether to perform the “3-edge method” alone or to use the “2-edge method → 3-edge method” in combination. It will be.

  The above-mentioned “2-edge method” and “3-edge method” are methods in which specific edge adjustments are used in combination, but apart from this, the length of the mark and space is simply matched to the reference length. There is also a “one-edge method”. A method that measures the average length of all types of marks and spaces and moves the rising or falling edge of the recording pulse according to the amount of deviation from the reference length. It is.

  Specifically, for example, as shown in FIG. 13, the deviations from the reference lengths of mT Mark and nT Space are represented as DM (m) and DS (n), respectively, and the inherent change amount of the parenthesis mark and the end edge of the space Is aM (m), aS (n), the write strategy correction amount at the end edge of mT Mark is DM (m) / aM (m). Similarly, the write strategy correction amount of nT Space can be calculated by DS (n) / aS (n). Although the correction at the trailing edge is shown in FIG. 13, when the correction is performed at the leading edge, the correction amount of the write strategy can be obtained by the same calculation formula using the inherent change amount at the leading edge.

  This method is a very rough adjustment method that adjusts the mark length and space length independently (the effect of mark adjustment is not reflected in the space or vice versa), but the method is simple. The worse the recording state based on the reference write strategy, the better the ability. Therefore, when the “2-edge method” and the “3-edge method” are combined, “1-edge method → 3-edge method”, “1-edge method → 2-edge method → 3-edge method”, etc. It is effective to use “” in front of the “2-edge method” and the “3-edge method”.

Incidentally, when the “two-edge method” is adopted, an optimum write strategy correction value can be easily obtained by the following method. That is, as shown in FIG. 14, D2C deviation (Data to Clock Deviation) values before and after mT Mark are DLm and DTm, mT Mark front edge inherent change amount is RLm, and rear edge inherent change amount is RTm. Furthermore, if the front edge correction amount of mT Mark is n (2m-5) and the rear edge correction amount is n (2m-4), the following equation is formed at the front and rear edges of mT Mark. (K is a fixed value and a weighted average value of DLm and DTm).
DLm = FLm * n (2m-5) + RLm * n (2m-4) + k
DTm = FTm * n (2m-5) + RTm * n (2m-4) + k

  Furthermore, for all marks, the same equation can be constructed and summarized, and can be written in a matrix form as shown in “Equation 1” below.

  The above “Equation 1” corresponds to a general formula obtained by extending the simultaneous equations shown in the description of step S103 in FIG. The solutions (n1, n3,..., N23, n2, n4,..., N24) at this time can be easily obtained by calculating an inverse matrix. Further, when the thermal influence before and after the mark is small (can be ignored), it is also possible to calculate “0” for all of RL3 to RL14 and FT3 to FT14 of “Equation 1”.

  The case of the “3-edge method” shown in FIG. 15 can be considered in the same manner. First, as shown in FIG. 15, the specific change amount is determined, and further, D2C deviation at mT Mark-nT Space is set to DT (m, n), and D2C deviation at mT Space-nT Mark is set to DL (m, n).

  At this time, the correction values nL (m, n) and nT (m, n) can be expressed by the following equation (2).

なお、「数２」において、ＲＴ（ｉ）はiT Markの存在確率、ＲＬ（ｉ）はiT Spaceの存在確率をあらわすものとする。

In “Equation 2”, RT (i) represents the existence probability of iT Mark, and RL (i) represents the existence probability of iT Space.

  In the above “Equation 2”, if all the combinations are expressed in the same manner, it can be expressed in a matrix form as in “Equation 1”, and the solution can be easily calculated by obtaining an inverse matrix thereof. “Equation 3” below represents “Equation 2” in matrix form.

なお、「数３」において、p(3,3)〜p(14,14)およびq(3,3)〜q(14,14)部分はΣ部分の係数が入る。また、「数３」においても、隣接エッジの影響が小さい（無視できる）場合にはpおよびqを「０」として計算することも可能である。

In “Equation 3”, the coefficients of the Σ portion are entered in the portions of p (3,3) to p (14,14) and q (3,3) to q (14,14). Also in “Equation 3”, when the influence of adjacent edges is small (can be ignored), p and q can be calculated as “0”.

  Next, as a method of determining the usage type and usage order of the four strategies shown in FIG. 12, the signal-specific sample ratio of the reference write strategy recording unit is measured, and the usage type and usage order of the strategy are determined based on the sample ratio. The usage strategy determination method will be described below.

  Among the recording results of the four reference write strategies used in FIG. 12, when the WS-2 and WS-4 marks and spaces of the D2C deviation are two-dimensionally mapped, the result is as shown in FIGS. However, X and Y are set as shown in FIG. That is, X which is a deviation of mT Mark is m + dm, and Y which is a deviation of nT Space is n + dn.

  From FIG. 17 and FIG. 18, it can be confirmed that the distribution of WS-4 is considerably different from that of WS-1. FIG. 19 is an enlarged view when the target is applied to the 3TM-3TS portion in FIG. 17, and FIG. 20 is an enlarged view when the target is applied to the 3TM-3TS portion in FIG. As is clear from FIG. 19, in the case where good recording such as WS-1 is performed, most of the data is within a specified range (specified window). On the other hand, as shown in FIG. 20, when the recording quality is inferior like WS-4, there are not only those that are out of the specified range but also leakage from the outside.

  In such a case, even if the average value (center value) of the distribution is obtained, the average value of the distribution in the correct specified range is not obtained. Therefore, even if the write strategy is optimized by the mark-space combination based on this average value, it is impossible to set with high accuracy. For this reason, it is necessary to determine whether or not the sampled mark-space combination data can be used for setting the write strategy.

  As a method for determining whether or not the write strategy should be set by the mark-space combination, there is a method of measuring the number of samples that fall within a specified range and determining whether or not the distribution is correct. The table shown in FIG. 21 shows the average distribution probability of DVD data. As shown in FIG. 21, the existence probability for each mark-space combination is determined. Therefore, after recording with the reference write strategy, the sample number ratio is obtained, and it is only necessary to determine whether the value of each element is within ± x (x is an allowable error) of the values in the table of FIG.

  Note that it is possible to increase the accuracy by creating distribution reference data similar to that in FIG. 21 from data at the time of recording without using a very average distribution probability as in FIG. Moreover, you may judge from the sample ratio about the combination of 3T and 4T which has the largest influence, without judging about all the elements (combination of 3TM-14TM, 3TS-14TS). That is, for example, a <sample (3,3) / sample (3,4) <b, c <sample (3,3) / sample (4,3) <d,. . . . May be calculated to determine whether the most influential data is within an acceptable range.

  Next, as a method of determining the usage type and usage order of the four strategies shown in FIG. 12, the jitter of the reference write strategy recording unit is measured, and the usage type and usage order of the strategy are determined based on the jitter value. The determination method will be described.

  For example, when the “2-edge method” and “3-edge method” are used, the jitter is measured after recording with the reference write strategy, and if the value is below a specified value (recording quality is good), the “3-edge method” is used. It is performed independently, and if it is equal to or more than the specified value, the “2-edge method → 3-edge method” may be performed. If the recording quality is even worse, it is effective to carry out in three stages, “1 edge method → 2 edge method → 3 edge method”.

  Specifically, in FIG. 12, when the specified jitter is 11% and the jitter value in the reference write strategy is less than this, the “3-edge method” is performed alone, and when it exceeds this, the “2-edge method → 3 The “edge method” is executed. As described above, after the reference write strategy is recorded, it is possible to set an efficient and stable strategy by determining whether the “three-edge method” alone or “two-edge method → three-edge method” is linked depending on the recording quality. . Note that the jitter shown in FIG. 12 is intended for all jitter, but the same determination can be made by using a specific combination of D2C jitter such as 3TM-3TS, which has a large influence.

  Next, as a method for determining the usage type and usage order of the four strategies shown in FIG. 12, the deviation of the reference write strategy recording unit is measured, and the usage type and usage order of the strategy are determined based on the deviation value. The determination method will be described.

  FIG. 22 shows the distribution by mark next to 3TS. As shown in the figure, the deviation (the amount of deviation between the theoretical value and the distribution center value) for each combination of mark-space and space-mark is obtained. If this is greatly deviated, it is considered that a part of the distribution leaks into the adjacent window, and the “1 edge method” or the “2 edge method” is executed before the “3 edge method”.

  Further, it is possible not only to make a determination based on a deviation of deviation, but also to determine whether or not “deviation ± 3 × jitter” falls within a specified window, thereby making a more accurate determination. Therefore, in FIG. 22, it is only necessary to determine whether R (3T) ± ρ (3T) falls within the specified window.

  As mentioned above, the example of using the “sample ratio by signal”, “jitter value”, and “deviation value” has been explained about the method of determining the strategy to be used, which determines the usage type and order of the strategy. Instead, it is also possible to improve the determination accuracy by combining them with each other.

  Next, the ROM 6 (see FIG. 1) shows the inherent change amount (the change amount of the mark length or space length per recording pulse unit) used for the automatic setting of the write strategy every time the optical disc type, recording speed, and RF signal equalizer are set. ) And setting the optimum write strategy using this inherent change amount will be described.

  FIG. 23 shows an operation flow in which the inherent change amount is stored in the ROM 6 in advance, and an optimal write strategy is calculated using this. A rough operation of the present embodiment in which the inherent change amount is stored in the ROM 6 in advance will be described with reference to FIG.

  First, the control unit 9 reads Disc ID, which is identification information of the optical disc, from the optical disc (step S301). Next, the control unit 9 sets the recording speed (step S302), and reads the inherent change amount that matches the type and recording speed of the optical disc from the ROM 6 (step S303). Then, the control unit 9 performs test recording in the test area of the optical disc with the reference write strategy (step S304), and sets the optimum write strategy using the result and the inherent change amount stored in the ROM 6 (step S305). .

  By the way, for example, as in the prior art, if the inherent change amount for each optical disk to be recorded is obtained by actual measurement and the write strategy is calculated using the value, thermal interference peculiar to high-speed recording as described later can be obtained. If neglected, it is possible to set a write strategy with high accuracy. On the other hand, such a conventional method also has the following problems.

(1) It is necessary to record at least two different strategies and reproduce them to find the deviation difference. The write strategy correction amount W is
W = D1 / {(D2-D1) / (S2-S1)}
Calculate with For this reason, since the measurement error is affected by both the denominator and the numerator, there is a problem that the influence of the measurement error becomes large.
(2) When thermal interference distortion as shown in FIG. 24 occurs, there is a problem that an incorrect write strategy is set.
(3) Since at least two test recordings are required, there is a problem that not only the use amount of the test area of the optical disc is increased but also the strategy setting time is long.

In contrast, in the present embodiment in which the inherent change amount (a (m, n)) is stored in the ROM 6 in advance, the following effects can be expected with respect to the above (1) to (3).
(1) Since it is obtained by W = D1 / a (D1: actual measurement value, a: stored value), only the numerator is affected by the error.
(2) The influence of thermal interference distortion is small.
(3) Since the optimum strategy can be calculated by one recording, the storage area and operation time can be reduced.

On the other hand, storing the inherent change amount in the ROM 6 causes the following problem.
(1) Since the strategy is optimized using the inherent change amount stored in the optical disc apparatus, it is necessary to set the inherent change amount for all optical discs in advance. Also, if recording is performed on an optical disc that is not compatible, the strategy cannot be optimized.
(2) Since the inherent changes for all optical disks must be stored, a ROM 6 having a large storage capacity is required.

  However, when the inherent variation was measured at various optical discs and recording speeds, the following results were obtained. FIG. 25 is an explanatory diagram when the front edge and the rear edge of the recording pulse are moved for each mark type, and the mark edge at that time is measured. In the figure, the inherent change amount a is a = dT / ΔT.

  FIG. 26 shows 3T, 4T, and 5T inherent change amounts at various types of optical discs and recording speeds, and it can be seen that the inherent change amount varies depending on the type of the optical disc. FIG. 27 and FIG. 28 show the inherent change amounts of the front and rear edges during DVD-R (A company optical disc) quadruple speed recording, respectively. This inherent change amount corresponds to the slope of each approximate line. As shown in these figures, the mark length change corresponding to the change of the recording pulse can be obtained at both the front and rear edges.

  FIG. 29 is a comparison of the inherent variation when DVD-R optical discs classified by media manufacturer (optical discs A, B, C, and D) are recorded at 4 × speed. FIG. 30 is a comparison of 3T, 4T, and 5T inherent change amounts at the time of quadruple speed recording on the same optical disc by media manufacturer as in FIG. As can be seen from FIG. 29 and FIG. 30, if the recording speed is the same for the same type of optical disc, it can be seen that the inherent change amount is almost the same even if the media manufacturer and disc ID are different.

  FIG. 31 and FIG. 32 compare the inherent change amounts when the recording speed is changed in four stages from 4 × speed to 32 × speed on the CD-R of the optical disc B. As can be seen from these figures, even with the same type of optical disk, when the recording speed is different, the inherent change amount is also affected.

  FIG. 33 shows the difference in inherent variation when the inherent variation of the front edge of the same optical disc (DVD-R) is measured by reproducing with a different optical disc apparatus. Different devices have different RF equalizer settings during playback. As can be seen from the figure, if the signal correction value of the RF equalizer setting is different, the inherent change amount is also different.

  From the results shown in FIGS. 26 to 33, the types of optical disks (DVD-R, CD-R, CD-RW (HS), DVD-RAM...), Recording speed, and RF signal correction value are set. If they are different, it can be seen that if the unique change amount is set in accordance with the conditions, the same unique change amount can be used regardless of the optical disc media manufacturer and media type (Media ID).

  In addition, when a disc code is set for each used pigment of a medium, such as a CD-R, this classification can be added. Furthermore, the recording speed is also 1 ×, 2 ×, 3 ×. . . It is also effective to set a width such as 1 × speed to 4 × speed, 5 × speed to 10 × speed.

  By storing the inherent change amount for each type of optical disc, even when an incompatible optical disc is recorded, the optimum write strategy can be set if the type and recording speed of the medium are known. In addition, since it is not necessary to store the unique change amount for each Media ID, the memory capacity required for storage can be reduced.

  The graph of FIG. 34 shows the fluctuation of the space jitter when the strategy is automatically set while changing the recording power when the CD-R (optical disc-E) is recorded at 16 × speed. Jitter variation is observed near 32 mW of the reference write strategy, which is the effect of thermal interference distortion. As is apparent from this graph, when the inherent change amount is calculated from the actually measured value, it can be understood that the jitter value suddenly deteriorates after 32 mW due to the erroneous setting of the strategy and becomes unusable.

  On the other hand, when the inherent change amount is used as a fixed value, it can be seen that normal recording is performed up to at least about 35 mW. Therefore, it can be seen that if the inherent change amount is stored in the storage device in advance, stable recording can be performed against thermal interference distortion during high-speed recording. Note that the recording power at which the distortion of thermal interference occurs depends greatly on the optical disc. From this point of view, it can be said that having an inherent change amount as a fixed value is large in view of the stability of recording quality.

  Next, when performing the automatic setting of the strategy considering the influence of the adjacent edge of the write strategy setting and the adjacent edge across the mark, when performing the automatic setting of the strategy considering the influence of the corresponding edge and both adjacent edges It will be described below that only the influence of adjacent edges sandwiching a particularly short signal such as 3T and 4T among the influences of adjacent edges need to be considered.

  As shown in FIG. 35, in the combination of mT Mark-mT Space, when moving the sandwiched edge by a specified amount, the mT Mark front edge (A-Edge) of the generated mT Mark-mT Space combination, The D2C deviations of the trailing edge (B-Edge) of mT Mark and the trailing edge (C-Edge) of mT Space are measured. The graphs of FIGS. 36 to 38 show the relationship between the pulse edge movement measured in this way and the D2C deviation of each edge.

  36 shows combinations of 3T marks and 3T spaces when DVD-R is recorded at 4 × speed, FIG. 37 shows combinations of 4T marks and 4T spaces, and FIG. 38 shows combinations of 5T marks and 5T spaces. FIG. 39 is a graph obtained by standardizing the slope of each approximate line obtained from the graphs of FIGS. 36 to 38 by dividing it by 1T. From the above results, it can be seen that the influence on the adjacent edges (A-Edge, C-Edge) should be considered particularly short signals (3T and at most 4T).

  The optimum write strategy can be obtained by the matrix calculation shown in the above-described “Equation 1” or “Equation 3”. At this time, by limiting the influence from the adjacent edge to 3T (and 4T), the coefficient portion The set value can be reduced. That is, in adjusting both edges of the mark, RL4 (RL5) to RL14 and FT4 (FT5) to FT14 of “Equation 1” can be calculated as “0”. Further, in the adjustment in the mark-space combination, all the coefficients not related to 3T (4T) of p (m, n) and q (m, n) can be calculated as “0”. This means that when the coefficient value is stored in the optical disk device (for example, ROM 6) and used, the capacity of the storage memory is reduced, and when the coefficient is calculated from actual recording, the calculation amount is reduced. Has the effect of reducing.

  As described above, the embodiments of the present invention have been described in detail with reference to the drawings, but the specific configuration is not limited to these embodiments, and includes design changes and the like within a scope not departing from the gist of the present invention. It is.

It is a block diagram of the optical information recording device concerning this embodiment. It is a processing flow of a 1st embodiment. This shows the influence on the 3T recording mark when the falling edge of the recording pulse signal of the 3T mark is changed by a predetermined amount. It shows the influence on the 3T recording mark when the amount of change with respect to the falling edge of the recording pulse signal of the 3T mark is increased or decreased. It shows the relationship between the difference value and the specific correction amount according to the first embodiment. This shows the effect of changing the falling edge of the 3T mark recording pulse signal by a predetermined amount in the combination of 3T mark and 3T space. This shows the degree of influence when the amount of change with respect to the falling edge of the recording pulse signal of the 3T mark is increased or decreased in the combination of the 3T mark and the 3T space. The relationship between the difference value which concerns on 2nd Embodiment, and the specific correction amount is shown. It is a processing flow of a 2nd embodiment. It is a figure which shows the effect of this invention. It is a figure which shows the effect of this invention. 10 is a graph comparing the effects of “2-edge method”, “3-edge method”, and “2-edge method → 3-edge method” when the reference write strategy (Default) is changed. This is an adjustment method for adjusting the mark length and the space length independently. It is explanatory drawing which made the value of D2C deviation before and behind mT Mark DLm and DTm. It is explanatory drawing which showed D2C deviation in the case of setting a strategy for every combination of a mark and a space. The set values of X and Y are shown when two-dimensional mapping of the write strategy mark and space D2C deviation of WS-1 and WS-4 is shown. A two-dimensional map in D2C deviation in WS-1 is shown. 2 shows a two-dimensional map in D2C deviation in WS-4. It is the enlarged view which showed distribution of 3TM-3TS when favorable recording was made. It is the enlarged view which showed distribution of 3TM-3TS when recording quality is inferior. The existence probability table for each mark-space combination is shown. This shows the distribution by mark next to 3TS. It is a flowchart which shows operation | movement when the intrinsic | native change amount used at the time of automatic setting of a write strategy is memorize | stored in the optical disk apparatus. It is explanatory drawing which showed the mode when a thermal interference distortion generate | occur | produces with respect to a normal case. The state when the mark edge is measured by moving the rear edge before and after the recording pulse is shown. 3 is a graph showing 3T, 4T, and 5T inherent change amounts (front edges) at various optical discs and recording speeds. It is the graph which showed the natural variation | change_quantity of the front edge at the time of 4 times speed recording of DVD-R. It is the graph which showed the specific variation | change_quantity of the trailing edge at the time of 4 times speed recording of DVD-R. It is a graph when 3T intrinsic change amount is compared at the time of quadruple speed recording in DVD-R according to media makers. It is a graph when the inherent change amount of 3T, 4T, and 5T is compared at the time of quadruple speed recording in a DVD-R classified by media manufacturer. It is a graph when comparing the inherent change amount when the recording speed is changed with the same type of CD-R. It is a graph when comparing the inherent change amount when the recording speed is changed with the same type of CD-R. FIG. 5 is a graph showing the difference in inherent variation when measured with different RF signal correction values on the same optical disc. It is the graph which showed the fluctuation | variation of the space jitter when changing the recording power and automatically setting the strategy in coefficient calculation and coefficient fixation. It shows a combination of mT Mark-mT Space. The D2C deviation of each of the front edge, rear edge, and rear edge of 3T space in the combination of 3T mark and 3T space is measured, and the relationship between the pulse edge movement amount and the D2C deviation of each edge is graphed. . The D2C deviations of the front edge, the rear edge, and the rear edge of the 4T space in the combination of the 4T mark and the 4T space are measured, and the relationship between the pulse edge movement amount and the D2C deviation of each edge is graphed. . This is a graph showing the relationship between the pulse edge movement amount and the D2C deviation of each edge by measuring the D2C deviation of the front edge, the rear edge of the 5T mark, and the rear edge of the 5T space in the 5T mark-5T space combination. . It is the graph which calculated | required the inclination of each approximate straight line from the graph of FIGS. 36-38, and divided by 1T and normalized.

Explanation of symbols

1. Optical disc (optical recording medium)
2 ... optical pickup 3 ... head amplifier 4 ... data decoder (reproduction signal generation means, clock signal generation means)
5 ... Difference detection unit (detection means)
6 ... ROM
7 ... RAM
8 ... Write strategy setting section (correction means)
9. Control unit (test recording means)
DESCRIPTION OF SYMBOLS 10 ... Recording pulse train correction | amendment part 11 ... Controller 12 ... Data encoder 13 ... Laser drive part

Claims (12)

An optical information recording apparatus that generates recording pulse light according to a predetermined write strategy and records the information by forming an array of marks and spaces on the optical recording medium by irradiating the generated recording pulse light to the optical recording medium There,
Test recording means for performing test recording of information including a plurality of types of marks on the optical recording medium according to the predetermined write strategy;
Read information recorded on the optical recording medium by the test recording means to generate a binary reproduction signal corresponding to the mark and space, and a clock generation means for generating a clock having a predetermined frequency Detecting means for detecting, for each edge of each mark whose value is switched in the reproduction signal generated by the reproduction signal generation means, a deviation between the timing of the edge and the clock generated by the clock generation means; and An optical information recording apparatus comprising: correction means for correcting the predetermined write strategy for each mark so that all the deviations detected for each edge by the means coincide with each other. For each edge of each mark, a reproduction signal obtained by setting a write strategy that changes only the timing of the edge by a predetermined amount with respect to the predetermined write strategy, and reading information recorded according to the set write strategy And a storage means for preliminarily storing the amount of change in the timing between the edge at and the corresponding edge in the reproduction signal obtained by reading the information recorded according to the predetermined write strategy as the inherent change amount of the edge,
The correction means determines the correction amount of the predetermined write strategy based on the inherent change amount stored in the storage means;
The optical information recording apparatus according to claim 1.   3. The optical information recording apparatus according to claim 2, wherein the inherent change amount stored in the storage unit is set to a value corresponding to a type of the optical recording medium, a recording speed, and an RF signal correction setting. . The test recording means
For each edge of each mark, set a write strategy for changing only the timing of the edge for the predetermined write strategy by a predetermined amount, and further execute test recording according to the set write strategy,
The correction means is
Each edge of each mark is recorded according to the edge in the reproduction signal obtained by reading the information recorded by the test recording means according to the write strategy for changing the timing of the edge by a predetermined amount, and according to the predetermined write strategy. The amount of change in timing with the corresponding edge in the reproduction signal obtained by reading the obtained information is obtained as the inherent change amount of the edge,
2. The optical information recording apparatus according to claim 1, wherein a correction amount of the predetermined write strategy is determined based on the obtained inherent change amount. The specific change amount of each edge includes the change amount of the timing of each edge adjacent to the edge with the edge shifted by the predetermined amount by setting the write strategy, and the edge and the mark,
The optical information recording apparatus according to claim 2, wherein the optical information recording apparatus is an optical information recording apparatus.   6. The optical information recording apparatus according to claim 5, wherein the change in timing of each of the edge shifted by the predetermined amount and the adjacent edge across the mark is a short signal. The specific change amount of each edge is determined for each combination of a mark and a space sandwiching the edge, and the edge whose timing is shifted by the predetermined amount by the setting of the write strategy, the edge adjacent to the edge and the mark And the amount of change in the timing of each edge adjacent to the edge across the space,
The optical information recording apparatus according to claim 2, wherein the optical information recording apparatus is an optical information recording apparatus.   The timing difference between the edge shifted by the predetermined amount and the edge adjacent to the mark and the edge adjacent to the edge and the space is a short signal. Item 8. The optical information recording apparatus according to Item 7.   The information recorded by the predetermined write strategy is generated by the reproduction signal generation means, the recording quality of the reproduction signal is measured, and the write strategy to be used is based on the value calculated from the data of these reproduction signals. The optical information recording apparatus according to claim 5, wherein the setting order is determined. When the recording quality of the test recorded by the predetermined write strategy is good, the correction amount of the predetermined write strategy is determined based on the inherent change amount according to claim 7,
When the recording quality is low, after correcting with the correction amount of the predetermined write strategy based on the inherent change amount according to claim 5, the predetermined write strategy is corrected based on the inherent change amount according to claim 7. The optical information recording apparatus according to claim 9, wherein a correction amount is determined.   10. The optical information according to claim 9, wherein the recording quality of the predetermined write strategy is determined using one or more of a sample ratio, a jitter value, and a deviation value of a signal reproduced by the reproduction signal means. Recording device. An optical information recording method for generating recording pulse light according to a predetermined write strategy, and irradiating the generated recording pulse light to the optical recording medium to form an array of marks and spaces on the optical recording medium and recording information There,
A first step of performing test recording of information including a plurality of types of marks on the optical recording medium according to the predetermined write strategy;
A second step of reading information recorded in a test on the optical recording medium and generating a binary reproduction signal corresponding to the mark and space;
A third step of generating a clock of a predetermined frequency;
A fourth step of detecting, for each edge of each mark whose value is switched in the generated reproduction signal, a deviation between the timing of the edge and the clock;
A fifth step of correcting the predetermined write strategy for each mark so that all the deviations detected for each edge coincide;
An optical information recording method comprising:

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