KR20060053826A - Optical disk device - Google Patents

Abstract

Without using a special recording pattern, a highly accurate write strategy suitable for an optical disk to be used is set in a short time. On the optical information recording medium, the mark length and the space length recorded with the straddle with which the at least one setting parameter was changed in the combination of a plurality of types of marks and spaces with respect to the reference struts or the reference struts, Based on the mark length and the space length and the respective theoretical lengths, the deviation value of each mark and space by varying the stratification is calculated, and the intrinsic stretch amount of all marks and spaces is calculated from the deviation value and the probability of existence of each mark and space. It calculates, and calculates the variance of the deviation by the combination of each mark and space from the deviation value of each mark and space, and uses a mark and space specific expansion-and-contraction amount, and sets stratji so that dispersion may be minimum.

Optical Disc, Light Stratter, Mark Length, Space Length, Deviation Value

Description

Optical Disc Device {OPTICAL DISK DEVICE}

1 is a configuration diagram of an optical disk device.

2 is a processing flowchart for obtaining an inherent amount of expansion and contraction.

3 shows an example of the required deviation;

4 is a diagram showing a procedure for obtaining an optimal light stratger.

5 is a diagram showing an adjustment procedure for obtaining an optimal light stratger.

6 is a table of deviations of marks existing before the space.

7 is a table of deviations of the spaces present after the mark.

8 is a diagram plotting deviations in a combination of a mark and a space in two-dimensional coordinates.

FIG. 9 is a diagram of a weighted average of 5T or more in FIG. 22. FIG.

Fig. 10 shows the effect of each mark-space when the deviation of the 3T space-3T mark is moved.

Fig. 11 shows the initial state and the state after the deviation operation with respect to the deviation of each mark-space.

12 is a diagram illustrating a distribution state for each target to be set.

Fig. 13 shows the difference in initial distribution.

14 is a table of deviations of marks existing before the space.

Fig. 15 is a deviation table of spaces present after the mark.

FIG. 16 is a table showing differences in deviations of FIGS. 28 and 29. FIG.

Fig. 17 is a process flow chart relating to the setting of strategies.

<Description of Symbols for Main Parts of Drawings>

1: optical disc 2: optical pickup

3: head amplifier 4: data decoder

5: Recording length detector (measurement means) 6: ROM (theoretical length storage means)

7 RAM (measured value storage means) 8 Intrinsic stretch amount calculating unit (unique stretch amount calculating means)

9: dispersion calculation unit (distribution calculation unit) 10: recording pulse string correction unit (recording unit)

11 control unit (difference value calculating means, deviation value calculating means)

12: strategie setting unit (light strategie setting means)

13 controller 14 data encoder

15: laser drive unit

The present invention relates to an optical disc apparatus and an optical information recording method for recording and reproducing information on an optical disc.

In recent years, with the development of information and communication technology, a great deal of information is actively exchanged through a network due to the prevalence of the Internet and the like. In such a situation, in the field of information recording apparatus, in recent years, recordable optical discs such as CD-R and rewritable optical discs such as CD-RW have attracted attention as recording media. By shortening the wavelength of a semiconductor laser as a light source, reducing the spot diameter by a high NA objective lens having a high numerical aperture, and adopting a thin substrate, such as DVD ± R, DVD ± RW, DVD-RAM, etc. A large capacity optical disc is used for the information recording apparatus.

The recording of information on the CD-R or the like is performed by converting recording information given from a personal computer (PC) or the like into an EFM (Eight: Fourteen Modulation) signal, but for example, a dye recording layer constituting an optical disk to be used. Due to the difference in composition, problems such as poor formation of marks due to heat storage of the recording medium and lack of cooling speed, etc., cause the desired land and space to not be formed even when the EFM signal is recorded as it is.

For this reason, a method is adopted in which recording parameters unique to individual optical discs (hereinafter, referred to as write stratification) used for reference recording waveforms are maintained, and maintaining good recording quality.

As described above, it is known that this light stratum has a close relationship not only with the dye of the optical disk, the phase change material, the film thickness of the dye or the shape of the groove, but also with the recording speed. In general, a representative light stratter is a method of varying the ratio of pit to land, a method of applying an additional pulse to the tip of the recording pulse, a method of changing the rising or falling position of the pulse by a combination of pit and land, and a recording pulse. And multipulse method.

The method of varying the pit-to-land ratio shortens the length of the pit during low-speed recording, thereby improving the shape of the tip and the end of the pit generated by irradiating a short pulse to the optical disk with a strong recording power. .

The method of applying an additional pulse to the tip of the recording pulse has an effect of improving the shape of the pit tip formed by additionally providing recording power to the tip of the pit where the irradiation of the laser is hardly converted into heat.

The combination of pit and land changes the position of the rising or falling pulse, for example, because the row of one pit affects the next pit through the land, depending on the length of the preceding land. Since the position of the end of the pit is changed, or the row of the recording pit is transmitted to the front, the position of the tip of the pit is changed according to the length of the recording pit, or the length of the recording pit is transferred to the rear, The pit formed by changing the end position of the pit or by changing the tip position of the land according to the length of the back land because the row of the pit behind one affects through the back land. There is an action that can equalize the gap between the lengths of the lands.

The method of multipulsing recording pulses is a method used for a phase change type disc or DVD such as CD-RW. When information is recorded on the phase change type disk by continuous pulses, the tip portion of the recorded pit is erased by the action of its own heat, and thus, multiple pulses having a cooling period between the pit are used.

As described above, the light stratter is optimized and used for each optical disc to be used due to the difference in the composition of the dye recording layer or the like constituting the optical disc to be used and the difference in the recording speed. For this reason, the current drive manufacturers require enormous time and process water.

In addition, since there are many types of optical discs in the market that cannot be understood by the drive manufacturers, it is impossible to prepare appropriate light strategists for all optical discs in the market.

In response to such a problem, in a test area of an optical disc, a method of selecting a stratifier whose reproduction jitter is minimized by recording a plurality of pieces of information on which the light stratifier is changed in a plurality of tracks (for example, (See Japanese Patent Application Laid-Open No. 2000-30254) or a method of obtaining a combination in which the jitter or deviation value due to the combination of a mark and a space is the smallest after recording the information by a special recording pattern (for example, Japanese Patent Laid-Open No. 2003-30). 30837 has been proposed.

However, in the former method, the light strategie selected finally is only the best light strategie among the set light strateges, and may be said to be the best light strategie for the optical disc to be used. none. In addition, there is a problem that the track is used only in the recording area required for the test.

In the latter method, since the influence on other marks or spaces when a specific mark or space is changed due to the use of a special recording pattern is not sufficiently considered, a single recording / reproduction test is used. There is a problem that it is extremely difficult to set the optimal light strategie for the optical disc.

Accordingly, the present invention has been made in view of the above problems, and an optical disc apparatus and an optical information recording method capable of setting a high-precision light stratum optimal for an optical disc to be used in a short time without using a special recording pattern. It aims to provide.

MEANS TO SOLVE THE PROBLEM In order to solve the said subject, this invention proposes the following matters.

The invention according to claim 1 is an optical disc apparatus for recording or reproducing information by forming marks and spaces on an optical information recording medium, wherein at least one of reference struts or reference struts is provided on the optical information recording medium. Measurement means for measuring the mark length and the space length recorded by the light stratger in which the setting parameter is changed by a combination of plural types of marks and spaces, measurement value storage means for storing the measurement result, and each mark and space The light stratification is changed based on the theoretical length storage means for storing the theoretical length, the mark length and space length stored in the measured value storage means, and the mark length and space length stored in the theoretical length storage means. Deviation value calculating means for calculating a deviation value of each mark and space by the above; Intrinsic stretch amount calculating means for calculating the stretch amount inherent in all marks and spaces from the output deviation value and the probability of existence of each mark and space, and the dispersion of the deviation by the combination of each mark and space from the calculated deviation value of each mark and space And light stratum staging setting means for setting the light stratum to minimize the calculated variance by using the calculated mark and space intrinsic amount of stretching. I'm proposing.

The invention according to claim 3 is an optical information recording method for recording or reproducing information by forming marks and spaces on an optical information recording medium. Measuring a mark length and a space length recorded with a light stratger in which at least one setting parameter is changed for a combination of a plurality of types of marks and spaces, storing the measurement results, and Storing the theoretical length, and each mark by varying the light stratification based on the mark length and space length stored in the measured value storage means and the mark length and space length stored in the theoretical length storage means. And calculating a deviation value of the space, the calculated deviation value and each mark and space. Calculating the stretching amount inherent to all marks and spaces from the existence probabilities, calculating a variance of the deviation by the combination of each mark and space from the calculated deviation values of each mark and space, and calculating the calculated marks and spaces. There is proposed an optical information recording method having a step of setting a light stratger so that the calculated dispersion is minimized by using an inherent amount of stretching.

According to this invention, the recording means writes to the optical information recording medium in the light strategie which has changed at least one setting parameter for a combination of a plurality of types of marks and spaces with respect to the reference strategie or the reference strategie. The marked mark length and the space length are measured. The deviation value calculating means calculates the deviation value of each mark and space by varying the light stratification based on the measured result and the theoretical length of each mark and space stored in the theoretical length storage means. The stretch amount calculating means calculates the stretch amount inherent to all marks and spaces from the calculated deviation value and the probability of existence of each mark and space. And the dispersion calculation means calculates the dispersion of the deviation by the combination of each mark and space from the calculated deviation value of each mark and space, and calculates using the mark and space specific stretch amount by which the light strattage setting means was calculated. Set the light stratage so that the distribution is minimal.

The invention according to claim 2 is an optical disc apparatus for recording or reproducing information by forming marks and spaces on an optical information recording medium, wherein at least a reference stratifier or a reference strutger is formed on the optical information recording medium. Measurement means for measuring the mark length and space length recorded with a light stratger in which one setting parameter is changed for a combination of a plurality of types of marks and spaces, measurement value storage means for storing the measurement result, each mark and The light strut paper is changed based on the theoretical length storage means for storing the theoretical length of the space, the mark length and the space length stored in the measured value storage means, and the mark length and the space length stored in the theoretical length storage means. Deviation value calculating means for calculating a deviation value of each mark and space by applying; The amount of stretching means for calculating the stretch amount inherent to all marks and spaces from the calculated deviation value and the probability of existence of each mark and space, and the difference of the deviation by the combination of each mark and space from the calculated deviation value of each mark and space. A difference value calculating means for calculating a value, and light stratum setting means for setting a light stratage that each calculated difference value is equal to or less than a predetermined value by using the calculated mark and space intrinsic stretch amount. An optical disk device is proposed.

The invention according to claim 4 is an optical information recording method in which marks and spaces are formed on an optical information recording medium to record or reproduce information. Measuring a mark length and a space length recorded with a light stratger in which at least one setting parameter is changed for a combination of a plurality of types of marks and spaces, storing the measurement results, and Storing the theoretical length, and each mark by varying the light stratification based on the mark length and space length stored in the measured value storage means and the mark length and space length stored in the theoretical length storage means. And calculating a deviation value of the space, the calculated deviation value and each mark and space. Calculating a stretching amount inherent to all marks and spaces from the probability of existence; calculating a difference value of a deviation by a combination of each mark and space from the calculated deviation value of each mark and space; and calculating the calculated marks and spaces. An optical information recording method is proposed which has a step of setting a light straddle in which each of the calculated difference values is equal to or less than a predetermined value by using an inherent amount of expansion and contraction.

According to this invention, the recording means writes to the optical information recording medium in the light strategie which has changed at least one setting parameter for a combination of a plurality of types of marks and spaces with respect to the reference strategie or the reference strategie. The marked mark length and the space length are measured. The deviation value calculating means calculates the deviation value of each mark and space by varying the light stratification based on the measured result and the theoretical length of each mark and space stored in the theoretical length storage means. The stretch amount calculating means calculates the stretch amount inherent to all marks and spaces from the calculated deviation value and the probability of existence of each mark and space. And the difference value calculating means calculates the difference value of the deviation by the combination of each mark and space from the calculated value of each mark and space, and the light stratification setting means uses the calculated mark and space specific stretch amount Then, the light strategie is set such that the calculated difference values are equal to or less than a predetermined value.

Hereinafter, before describing the optical information recording method in the optical disk apparatus according to the embodiment of the present invention, another optical information recording method will be described in detail with reference to FIGS.

Fig. 2 is a flow chart of the strategi setting in the case of recording information on CD-R / RW. According to Fig. 2, first, the control unit sets the reference write stratges stored in the recording unit to the recording pulse string correction unit, and executes the recording operation (step 101). Next, an integer multiple of the minimum resolution that can set the light strategie from the 3T mark before the 5T space from the 3T space with a high probability of presence for the reference light strategage, which has a high influence on other marks and spaces. The write operation is executed with the light straddle stretched by the step (step 102). In consideration of later processing, the amount of elongation is preferably the minimum resolution, but considering that the minimum resolution is an extremely small value, it is preferable to set it to an integer multiple of the minimum resolution in order to reduce the influence of the error.

When each recording operation is completed, each recording signal is reproduced, the recording length detection section measures the recording lengths in all mark and space combinations, and stores the measurement results in the storage unit for each write strategist. (Step 103).

The control unit controls the deviation between the recording length when recorded with the reference struts stored in the storage unit and the theoretical length in the combination of all marks and spaces stored in the storage unit (see FIG. 3 (a)) and the predetermined mark. And a deviation from the theoretical length in the combination of the recording length and the combination of all marks and spaces stored in the storage unit when the space is recorded by writing a stretcher with an integer multiple of the minimum resolution (see FIG. 3 (b)). (Step 104) In addition, both deviation values (see FIG. 3 (c)) are calculated (step 105). When the amount of extension of the 5T mark from the 3T mark before the 5T space from the 3T space with respect to the reference light stratger is an integer multiple of the minimum resolution, the obtained deviation value is divided by the above integer value to be the deviation value for the minimum resolution.

Here, in order to calculate the amount of expansion and contraction specific to each mark and space from the calculated deviation value shown in Fig. 3C, the existence probability by the combination of each mark and space described above is performed. Here, for example, paying attention to the horizontal axis of 3TP in Fig. 3C, the inherent amount of expansion and contraction by the combination of the 3T mark and the 3T space is different from the deviation value in the combination of the 3T mark and the 3T space. Since the influence of the fluctuations of the 3T mark, the 3T space, the 4T space, and the 5T space is inherent, the amount of stretching inherent is respectively ΔT (3, 3), ΔT (4, 3), and ΔT (5. , 3), and the probability of occurrence of each combination is R (3, 3), R (4, 3), R (5, 3), and a deviation value between the 3T mark and the 3T space, Becomes the same relationship as

ΔT (3, 3)-ΔT (4, 3) × R (4, 3) / (1-R (4, 3))-ΔT (5, 3) × R (5, 3) / (1-R (5, 3)) = A

On the other hand, if the attention is paid to the thick line in Fig. 3C, in the combination including the 6T mark or the 6T space, although the 6T mark or the 6T space does not change, there is a close variation in each combination. exist. This deviation is concentrated by changing the length of the 5T mark from the 3T mark before the 5T space from the 3T space.

Therefore, for example, if Z is the deviation value between the 3T mark and the 6T space, Z is expressed as in Equation 2, and Equation 3 can be obtained by substituting this equation in Equation 1. If equation (3) is described in detail according to the numerical value in Fig. 3 (c), it will be as shown in equation (4), and since the existence probability in the combination of each mark and space is clear, by using this relationship, The amount of expansion and contraction inherent in the combination of the mark and the space can be obtained (step 105).

Z = ΔT (3, 3) × R (3, 3) / (1-R (3, 3)) + ΔT (4, 3) × R (4, 3) / (1-R (4, 3) ) + ΔT (5, 3) × R (5, 3) / (1-R (5, 3))

ΔT (3, 3) = (Z + A) (1-R (3, 3))

ΔT (3, 3) = (-2.4-7.7) × (1-R (3, 3))

ΔT (3, 4) = (-2.0-7.7) × (1-R (3, 4))

ΔT (3, 5) = (-0.7-7.7) × (1-R (3, 5))

ΔT (5, 5) = (-9.6-7.7) × (1-R (5, 5))

The correction value calculation method of this embodiment uses the inherent amount of expansion and contraction corresponding to the minimum resolution, which has been described earlier, to suppress the stuttering at the time of recording the information in the reference light strategizing paper below the minimum resolution, Is to set the optimal light strategie.

The final value of each mark and the correction value of the space is characterized by processing in order of high probability of existence. In other words, if the combination of marks and spaces having a high probability of adjustment is adjusted (see the processing sequence in Fig. 5), the influence will greatly affect the combination of other marks and spaces. Can converge.

Specifically, as shown in FIG. 4, for the combination of the 3T mark and the 3T space having the highest existence probability, it is determined whether or not the absolute value of the deviation with respect to the reference stratification is greater than the inherent amount of expansion and contraction (step 201). As a result of the determination, when the absolute value of the deviation with respect to the reference stratification is larger than the inherent amount of expansion and contraction, the deviation is corrected, and the deviation value is also adjusted based on the existence probability for other mark and space combinations (step 202).

On the other hand, when the absolute value of the deviation with respect to the reference stratification is smaller than the inherent amount of expansion and contraction, adjustment is then made to the combination of the 3T mark and the 3T space, which have a high probability of existence (step 203). Also for the adjustment of the combination of the 3T mark and the 3T space, the same processing as that of the combination of the 3T mark and the 3T space is performed (steps 203 and 204), and such processing is executed up to the combination of the 11T mark and the 11T space (step) 205).

In the above method, the optimum light strategie can be set in consideration of the influence of other marks and spaces. However, this method attempts to increase the recording quality by putting the deviation of each mark and space alone to zero, and has a great effect on improving the recording quality of only the marks and spaces. In practice, however, it is important to balance the recording quality of marks and spaces. Therefore, the present invention is intended to set the optimal light stratger from this point of view. Hereinafter, the content of the present invention will be described in detail with reference to FIGS. 1 and 6 to 17.

As shown in FIG. 1, the optical disk apparatus according to the embodiment of the present invention includes an optical disk 1, an optical pickup 2, a head amplifier 3, a data decoder 4, and a recording length detector (measurement). Means (5), ROM (theoretical length storage means) 6, RAM (measured value storage means) 7, intrinsic stretch amount calculating portion (unique stretch amount calculating means) 8, and dispersion calculator (distribution) Calculation means) 9, a recording pulse train correcting unit (recording means) 10, a control unit (difference value calculating means, deviation value calculating means) 11, and a strategage setting unit (light strategizing setting means) (12), the controller (13), the data encoder (14), and the laser driver (15). In addition, hereinafter, the difference between the different stratographs with different mark lengths obtained from the reproduced signal by reproducing the recorded signal is called deviation, and the amount of deviation from the theoretical value inherent to the mark is referred to as intrinsic stretch amount.

The optical disc 1 is an optical information recording medium capable of recording, reproducing and erasing information by a semiconductor laser. For example, CD-R, CD-RW, DVD ± R, DVD ± RW, DVD- RAM, etc.

The optical pickup 2 is an optical component such as 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, a polarizing beam splitter, a cylindrical lens, and A, B, C. It is divided into four areas of D, and has four or two-segment photodetectors (PD) for converting light into electrical signals, or a front monitor diode for monitoring laser output during recording and reproduction.

The head amplifier 3 detects the reflected light from the optical disc 1, calculates the reflected light amount from the detected reflected light, and generates an RF signal indicating the total sum of the reflected light amounts to the respective regions of the quadrant PD. A tracking error signal FE, which is a signal for detecting a focus difference of the irradiation laser of the optical pickup 2, is generated according to the astigmatism method, and tracking is a signal for detecting a truck difference of the irradiation laser of the optical pickup 2; The error signal TE is generated according to the push-pull method.

The data decoder 4 generates an EFM signal from the RF signal generated for the head amplifier 3, further converts it into a signal of a desired format and outputs it to the controller 13.

The recording length detector 5 inputs an EFM signal from the data decoder 4 and measures the pulse width of the input EFM signal by a time measurement circuit (not shown). In the present embodiment, the mark length and the space length in the combination of each mark and space are measured from the information recorded with the straddle, in which the specific mark or space length is individually changed with respect to the reference write strategie. do.

The ROM 6 is a non-rewritable memory device that stores a control program for controlling the entire optical disk device, a reference write stratification, a theoretical length of each mark and space, or a probability of existence of each mark. The RAM 7 is a rewritable storage device, and includes a measurement result of the recording length input from the recording length detection unit 5, a deviation value between the measured value of the recording length and the theoretical length of each mark and space, the amount of expansion and contraction unique to each mark and space, and the like. This is temporarily remembered.

The intrinsic stretch amount calculation section 8 calculates the intrinsic stretch amount of each mark from the measured value of the recording length stored in the RAM 7 and the theoretical length of each mark and space. The variance calculation unit 9 calculates a rate of change of each inherent amount of stretching when information is recorded by various light struts from the inherent amount of elasticity calculated by the inherent amount of elasticity calculation unit 8 and based on a predetermined equation. The dispersion in the combination of each mark and space is calculated.

The recording pulse train correcting unit 10 inputs the write stratger or the parameter from the control unit 11 or the stratger setting unit 12, forms a recording pulse train based on this, and outputs it to the laser driver 15. do. The control unit 11 performs control regarding the recording and reproducing operation of information on the optical disc in accordance with a control program stored in the ROM 6 as a whole. Moreover, in this embodiment, it also has the function of outputting the data respectively stored in RAM7 to the intrinsic expansion / contraction calculation part 8.

The strategi setting unit 12 sets the strategi which each mark and space length becomes a predetermined value based on the intrinsic amount of expansion of each mark and space obtained by the inherent amount of elasticity calculation unit 8, and sets the set light weight. The output is output to the recording pulse train correction unit 10.

The controller 13 is a device that supplies a recording signal to the data encoder 14 and reads out the recording signal from the data decoder 4, and the data encoder 14 receives the recording signal from the controller 13. The signal is converted into an EFM signal and output to the recording pulse train correcting unit 10. The laser driver 15 generates a pulse signal for driving a laser diode according to the input write pulse, and supplies this to a semiconductor laser (not shown) in the optical pickup 2.

Next, the setting method of the straddle in this invention is demonstrated using FIGS. 6-17.

As a method of setting the light strategie by the combination of a mark and a space, first, in the CD-R / RW, etc., the jitter value after changing the strategie by the calculation process is obtained, and the light strategie is used using this jitter. You can think of how to perform the setting. However, in the case of DVD, unlike the CD, the reason for the jitter is not for a specific T, but for the whole. Therefore, a calculation process is performed for 6T or more with a small number of samples and the jitter is calculated. On the other hand, when there are few samples, there exists a problem that a precision deteriorates rapidly. Therefore, the method using jitter is not necessarily effective for DVD, even if it is effective for CD. Therefore, the following two methods are proposed as methods applicable to all optical recording media.

The first method is a method of setting balanced stratification with respect to marks and spaces. Specifically, for example, considering a case where a space follows a mark, two deviation tables as shown in Figs. 6 and 7 are considered in the same degree as the space after the mark and the mark before the space. do. In this figure, for example, 3TM indicates a 3T mark and 3TS indicates a 3T space. In addition, when these marks are expanded in a two-dimensional coordinate system with the mark X and the space Y in this figure, it is as shown in FIG.

However, since the analysis becomes complicated because the number of points plotted is large, for example, the weighted average of these being lower than 5T or more is taken as shown in FIG. In Fig. 9, the distance Di between the plotted point and the origin is considered as the mean of the deviation of the mark-space coordinate axis, and the probability of existence of the plotted mark-space of this distance in the square of this distance Di is shown. When multiplying and considering all the sums as the deviation variance (K) (refer to Equation 5), the stratification in which this deviation variance is minimum becomes the optimal strategy. In Equation 5, K denotes the variance of the deviation, Di denotes the distance from each point to the origin, and Ri denotes the probability of existence of each point.

In FIG. 9, when the stratification of the point of the combination of 3T mark-3T spaces (indicated by (3, 3) in the figure) is changed by the minimum resolution, the entire distribution changes as shown in FIG. In addition, with the movement of (3, 3), about another point, it turns out that it moves in the direction opposite to the movement direction of (3, 3). In other words, by repeating the above operation using this property, all the points can be concentrated near the origin, that is, the variation variance K can be minimized. In practice, the setting of the straddle using this method results in a result as shown in FIG. 11A shows an initial state, and FIG. 11B shows a state after the operation.

In addition, until now, based on the empirical method, when setting the strtage, first, it was necessary to judge whether the target was marked or spaced. This corresponds to whether the point on the coordinate axis is first concentrated on the X axis or the Y axis when the two-dimensional coordinate is considered, but the variation variance K in the above method is minimized. As shown in FIG. 12, the point on the coordinate axis is concentrated on Y = X.

In addition, in using the above technique, it is necessary to first determine whether to adjust the edge of the mark-space or the edge of the space-mark. As for the determination criteria here, in order to aim to finally concentrate in the vicinity of the origin of a coordinate as mentioned above, it is preferable that such a point concentrates on Y = -X as an initial distribution state. For example, in the example of FIG. 13, the SMS-SMM has a larger R2 power average (R2) of the distribution (in the figure, R2 of SMS-SMM is 0.66797 and R2 of MSM-MSS is 0. 0406), and points on the coordinate axis are concentrated on Y = -X. Therefore, in the example of FIG. 13, the space-mark edge having a large R2 power average should be selected.

In Fig. 13, the SMS deviation means the deviation of the space side in the case of the space-mark, the SMM deviation means the deviation of the mark side in the case of the space-mark, and the MSM deviation means the mark-space. The MSS deviation of the mark side indicates the deviation of the space side in the case of mark-space.

On the other hand, the second method is an improvement of the first method. As described above, according to the first method, it is possible to set the optimum light strategie in consideration of the balance between the mark and the space. However, in the first method, since the calculation is huge, there is a problem that the load as software is large. Thus, the second method is to provide a write strategy equal to the first method while reducing the load on the software.

In the first method, it has been explained that such dispersion is minimized when the deviation data of all marks and spaces existing on the two-dimensional coordinate axis are concentrated on Y = X. The second method also follows this idea and makes it simple and easy to realize.

As shown in FIG. 14 and FIG. 15, the deviation of the mark and the space in the combination in which the nT space follows the mT mark is defined as DM (m, n) and DS (m, n), respectively. Furthermore, if the difference in the table shown in FIG. 14 and FIG. 15 is calculated | required as shown in FIG. 16, and each element of FIG. 16 is set to D (m, n),

D (m, n) = DM (m, n)-DS (m, n)

do.

Here, in the first method, the fact that all marks and space deviation data existing on the two-dimensional coordinate axis are concentrated on Y = X means that each element D (m, n) shown in FIG. 16 converges to zero. It corresponds to thing. Now, if the intrinsic stretch amount of the mark is KM (m, n) and the intrinsic stretch amount of the space is KS (m, n), then the average intrinsic stretch amount K (m, n) is

K (m, n) = (KM (m, n) + KS (m, n)) / 2

do.

Therefore, as actually shown in FIG. 17, it processes as follows using D (m, n) and K (m, n). That is, for each mark and space, it is determined whether or not the value of D (m, n) is smaller than K (m, n). Next, when the value of D (m, n) is larger than K (m, n), each inherent amount of expansion and contracting is added or subtracted to the corresponding mark or space.

At this time, for example, when the intrinsic stretch amount is added to the mark, a process of subtracting the intrinsic stretch amount is performed for the space neighboring the mark. In addition, by operating a specific mark or space, other marks and spaces are affected. Therefore, an influence degree that occurs when a specific mark or space is manipulated also applies to other marks and spaces. Also in this case, when an influence degree is added to a mark, a process of subtracting the influence degree is performed on the adjacent space. On the other hand, when the value of D (m, n) is smaller than K (m, n) for a specific mark or space, the same processing is performed on the next specific mark or space.

Therefore, according to this method, it is possible to set the optimum light stratterage in a short time without performing sufficient empirical rules or extensive calculations as in the prior art. In addition, it is possible to provide a method for setting a straddle applicable to any type of optical recording medium.

As mentioned above, although embodiment of this invention was described above with reference to drawings, a specific structure is not limited to this embodiment, The design change etc. of the range which do not deviate from the summary of this invention are included.

According to the present invention, it is possible to set an optimal write stratification in consideration of the influence of other marks and spaces without using a special recording pattern.

In addition, the present invention can be applied regardless of the type of optical recording medium, but in particular, DVD ± R / RW can be used after setting the mark width and mark shift amount of a specific mark. There is an effect that the setting of the strategie becomes possible.

Claims (4)

An optical disc apparatus for recording or reproducing information by forming marks and spaces on an optical information recording medium, A mark length and a space length recorded on the optical information recording medium with reference struts or light struts in which at least one setting parameter is changed in a combination of a plurality of types of marks and spaces is measured. Measuring means, Measured value storage means for storing the measurement result; Theoretical length storage means for storing the theoretical length of each mark and space; The deviation value which calculates the deviation value of each mark and space by changing the said light strategist based on the mark length and space length memorize | stored in the said measured value storage means, and the mark length and space length memorize | stored in the said theoretical length storage means. Calculation means, Intrinsic stretch amount calculating means for calculating the stretch amount inherent to all marks and spaces from the calculated deviation value and the probability of existence of each mark and space; Dispersion calculation means for calculating a dispersion of the deviation by the combination of the respective marks and spaces from the calculated deviations of the respective marks and spaces; And light stratage setting means for setting a light stratum such that the calculated dispersion is minimized by using the calculated mark and space specific stretch amount. An optical disc apparatus for recording or reproducing information by forming marks and spaces on an optical information recording medium, The mark length and the space length recorded in the light information recording medium in which the at least one setting parameter is changed for a combination of a plurality of types of marks and spaces with respect to the reference struts or the reference struts in the optical information recording medium. With measurement means to say, Measured value storage means for storing the measurement result; Theoretical length storage means for storing the theoretical length of each mark and space; The deviation value which calculates the deviation value of each mark and space by changing the said light strategist based on the mark length and space length stored in the said measured value storage means, and the mark length and space length stored in the said theoretical length storage means. Calculation means, Stretch amount calculating means for calculating the stretch amount inherent in all marks and spaces from the calculated deviation value and the probability of existence of each mark and space; Difference value calculating means for calculating a difference value of the deviation by the combination of each mark and space from the calculated deviation value of each mark and space; And light stratum setting means for setting a light stratage such that each calculated difference value is equal to or less than a predetermined value by using the calculated mark and space specific amount of expansion and contraction. An optical information recording method in which marks and spaces are formed on an optical information recording medium to record or reproduce information. The mark length and the space length recorded in the light information recording medium in which the at least one setting parameter is changed for a combination of a plurality of types of marks and spaces with respect to the reference struts or the reference struts in the optical information recording medium. To do that, Storing the measurement result; Storing the theoretical length of each mark and space, Calculating a deviation value of each mark and space by varying the light stratgage based on the mark length and space length stored in the measured value storage means and the mark length and space length stored in the theoretical length storage means. Wow, Calculating a stretch amount inherent to all marks and spaces from the calculated deviation value and the existence probability of each mark and space; Calculating a variance of the deviation by the combination of each mark and space from the calculated deviation value of each mark and space; And using the calculated mark and space intrinsic amount of stretching, setting a light stratage so that the calculated dispersion is minimized. An optical information recording method in which marks and spaces are formed on an optical information recording medium to record or reproduce information. The mark length and the space length recorded in the light information recording medium in which the at least one setting parameter is changed for a combination of a plurality of types of marks and spaces with respect to the reference struts or the reference struts in the optical information recording medium. To do that, Storing the measurement result; Storing the theoretical length of each mark and space, Calculating a deviation value of each mark and space by varying the light stratgage based on the mark length and space length stored in the measured value storage means and the mark length and space length stored in the theoretical length storage means. Wow, Calculating a stretch amount inherent to all marks and spaces from the calculated deviation value and the existence probability of each mark and space; Calculating a difference value of the deviation by the combination of the respective marks and spaces from the calculated deviation values of the respective marks and spaces; And using the calculated mark and space intrinsic stretch amount, setting a light stratage that each calculated difference value is equal to or less than a predetermined value.

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