JP2005222634A - Method and apparatus for measuring signal, and recording method and apparatus for information recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for measuring an information recording medium for easily and accurately determining write strategy (laser emission waveform rule) and optimizing recording conditions almost without adding circuits compared to the conventional measuring method of an information recording medium, and to provide a recording method and apparatus for an information recording medium. <P>SOLUTION: A time interval between a reproduced binary signal and a clock-punched binary signal is measured by using a random signal, whereby the displacement of a mark edge or a space edge is easily obtained, and thus, accurate recording compensation in a short period of time is realized. More specifically, time between the change point of the reproduced binary signal corresponding to the leading edge of a signal mark group and the change point of the clock-punched binary signal corresponding to the tail end edge of the signal mark group is measured to measure the displacement of the leading end edge position of each signal mark. Time between the change point of the clock-punched binary signal corresponding to the leading end edge of the signal mark group and the change point of the reproduced binary signal corresponding to the tail end edge of the signal mark group is measured to measure the displacement of the tail end edge position of each signal mark. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a signal measuring method and a recording method and apparatus for an information recording medium.

  In recent years, in the field of information recording apparatuses, recordable optical discs such as CD-R and rewritable optical discs such as CD-RW have been put into practical use as recording media. Recently, the DVD-R, DVD-RW, DVD-RW, etc. have been developed by shortening the wavelength of a semiconductor laser as a laser light source, reducing the spot diameter with a high NA objective lens having a high numerical aperture, and adopting a thin substrate. Large capacity optical disks such as DVD-RAM are used in information recording apparatuses.

  For example, recording of information on a DVD-R, which is one of recording media having a dye recording layer (dye-based recording medium), is performed by a mark edge recording method in which information is recorded at the beginning and end of a mark on the recording medium. ing. In recording on such a large-capacity optical disc, there is a pulse control system that adjusts the laser intensity according to the quality of the optical disc to be used in consideration of poor mark formation due to insufficient heat storage and cooling speed of the recording medium. It has been put into practical use. This pulse control system performs laser on / off control at fine intervals to adjust the laser intensity. In this pulse control system, there has been proposed a laser emission waveform rule (hereinafter referred to as a write strategy) using a multi-pulse composed of a pulse train composed of a combination of a leading heating pulse and a plurality of subsequent continuous heating pulses.

  Here, FIG. 16 shows an example in which the write strategy is obtained by the mark edge recording method.

  In FIG. 16, an optical information recording medium is irradiated with a laser beam modulated like a recording pulse 160 to form a signal mark 161. Thereafter, the signal mark 161 is irradiated with a very weak reproduction power. A reproduction signal 163 that is an electric signal modulated by the above-described method is obtained, and a reproduction binary signal 165 is obtained from the reproduction signal 163. A regenerated clock 166 is generated from the regenerated binary signal 165 by phase lock loop control (hereinafter referred to as PLL).

  In mark edge recording, the variation in time difference between the change point of the reproduction binary signal 165 and the change point of the reproduction clock 166 corresponding to the edge of each recording mark, that is, the variation in Z1 to Z5 in FIG. The histogram BB1 in FIG. 16 is a collection of time differences between the reproduced binary signal including Z1 to Z5 and the reproduced clock. That is, it can be said that the thinner and sharper the histogram BB1, the better the variation (hereinafter referred to as jitter) and the better the signal quality.

  Next, when adjusting the recording pulse 160 to further improve the jitter, the pulse width of the reproduced binary signal including Y1 and Y2 is measured in order to find the cause of the deterioration of the jitter. The results are histograms AA3 to AA14 in FIG. 16. In this case, it can be seen that AA4 which is a 4T mark (4 times the reproduction clock) is shifted to the wider side. However, in this case, since it is impossible to determine whether the signal mark has a wide start edge or a wide end, it is necessary to adjust both the start edge and the end edge of the recording pulse 160 and to always observe the jitter of the histogram BB1. Other than the 4T mark AA4, the signal width is the same, but when the start and end of the clock are shifted in the same direction, they do not appear in the histogram. Therefore, in order to optimally adjust the recording pulse, It took a long time.

Correspondingly, in Japanese Patent Laid-Open No. 2003-30837, the signal width of the reproduction binary signal is read, and the change point of the reproduction binary signal corresponding to the start and end of the recording mark and the change point of the reproduction clock The time difference (Z1 to Z5 in FIG. 16) is classified according to the start of the mark corresponding to the front space length and the end of the mark corresponding to the back space as shown in FIG. 17, and the average value of the shift amount of the edge of each signal mark There is a report that optimizes the recording pulse based on the data (see Patent Document 1).
Japanese Patent Laying-Open No. 2003-30837 (FIG. 8)

  However, as in the example of Japanese Patent Laid-Open No. 2003-30837, the signal width of the reproduction binary signal is read, and the change point of the reproduction binary signal corresponding to the start and end of the recording mark and the change point of the reproduction clock are determined. In order to classify the time difference according to the beginning of the mark corresponding to the front space length and the end of the mark corresponding to the rear space, and to calculate the average value of the deviation of the edge of each signal mark, complex hardware and software It is necessary to add additional wear, which increases costs.

  The present invention requires almost no additional circuit as compared with the conventional measuring method for information recording media, can easily and accurately determine the write strategy (laser emission waveform rule), and make the recording conditions more appropriate. An object of the present invention is to provide an information recording medium measuring method, recording method, and apparatus that can be converted.

  In order to achieve the above object, the signal measurement method of the present invention includes a reproduction binary signal obtained by binarizing a reproduction signal modulated by a signal mark group and a signal space group of an information recording medium, and the reproduction binarization. A reproduction clock signal is generated based on the signal, and a clock punching binarization signal is generated by removing fluctuation components at the rising and falling parts of the reproduction binarization signal using the reproduction clock signal. The time between the change point of the reproduced binary signal corresponding to the start edge of the mark group and the change point of the clock punched binary signal corresponding to the end edge of the signal mark group is measured, The deviation amount of the start edge position is measured, the change point of the clock punching binarization signal corresponding to the start edge of the signal mark group, and the reproduction binarization corresponding to the end edge of the signal mark group By measuring the time between the change point of the item, to measure the displacement amount of the end edge positions of each signal mark. Note that the reproduction binary signal and the clock punching binary signal are normally provided in the drive.

  By this method, the deviation amount of the position of the reproduction signal corresponding to the start edge and the end edge of the signal mark can be easily measured individually.

  The signal measuring method of the present invention also includes a reproduction binary signal obtained by binarizing a reproduction signal modulated by a signal mark group and a signal space group of an information recording medium, and a reproduction clock based on the reproduction binary signal. A signal is generated, and further, a clock punching binarized signal is generated by removing the fluctuation component of the rising / falling portion of the reproduced binarized signal using the reproduced clock signal, and is generated at the start edge of the signal space group. By measuring the time between the corresponding change point of the reproduced binary signal and the change point of the clock punched binary signal corresponding to the terminal edge of the signal space group, the deviation amount of the start edge position of each signal space And a change point of the clock punched binary signal corresponding to the start edge of the signal space group and a change of the reproduced binary signal corresponding to the end edge of the signal space group By measuring the time between, measuring the displacement amount of the end edge positions of each signal space.

  By this method, it is possible to easily individually measure the deviation amount of the position of the reproduction signal corresponding to the start edge and the end edge of the signal space.

  Further, in the signal measuring method of the present invention, since the signal mark group and the space group of the information recording medium are composed of random signals, it is possible to easily measure jitter performance, error rate, and the like.

  Further, the signal measuring method of the present invention of the present invention can easily determine an optimal write strategy when the signal mark group is a mark recorded on the optical recording material.

  The signal measuring apparatus of the present invention includes a disk rotating means for clamping and rotating an optical disk, a signal reproducing means for irradiating the optical disk with a laser beam and converting reflected light modulated by the signal mark into an electric signal, and a disk. Servo means for controlling the rotation of the laser beam and the position of the laser beam, binarizing means for generating a binarized signal from the reproduced signal output from the signal reproducing means, and receiving the binarized signal, A regenerated clock generating means for generating, a clock punching means for removing a fluctuation component of a binary change point of the binarized signal using the regenerated clock signal to generate a clock punched binary signal, and the binarization A time interval measuring means for measuring a time interval of a predetermined binary change point between the signal and the clock punched binarized signal.

  With this configuration, the shift amount of the position of the reproduction signal corresponding to the start edge and the end edge of the signal mark and signal space can be individually measured.

  Further, the recording method of the present invention irradiates an optical disc with a laser beam modulated with a recording pulse, generates a signal mark group on the optical disc, and then irradiates the optical disc with a reproduction laser beam, and the signal mark group and the space group. The reflected light modulated in accordance with the above is converted into an electric signal and generated as a binarized reproduction binary signal, a reproduction clock signal is generated based on the reproduction binarization signal, and the rise of the reproduction binarization signal is further generated. A clock punched binarized signal is generated by removing the fluctuation component of the falling portion using the reproduced clock signal, and the change point of the reproduced binarized signal corresponding to the start edge of the signal mark group, The time with the change point of the clock punching binarized signal corresponding to the end edge of the mark group is measured, and the time corresponding to the position of the correct start edge corresponding to each signal mark is measured. Actual calculated shift amount of starting end edge such that said shift amount is minimized, to adjust the corresponding to each signal mark the recording pulse. Note that the reproduction binary signal and the clock punching binary signal are normally provided in the drive.

  By this method, it is possible to optimize the recording pulse corresponding to the start edge of the signal mark group.

  Further, the recording method of the present invention irradiates an optical disc with a laser beam modulated with a recording pulse, generates a signal mark group on the optical disc, and then irradiates the optical disc with a reproduction laser beam, and the signal mark group and the space group. The reflected light modulated in accordance with the above is converted into an electric signal and generated as a binarized reproduction binary signal, a reproduction clock signal is generated based on the reproduction binarization signal, and the rise of the reproduction binarization signal is further generated. A clock punching binarized signal in which the fluctuation component of the falling portion is removed using the reproduced clock signal, and a change point of the clock punching binarized signal corresponding to the start edge of the signal mark group; The time with the change point of the reproduction binary signal corresponding to the terminal edge of the signal mark group is measured, and the time corresponding to the correct terminal edge position corresponding to each signal mark is measured. Obtains the actual shift amount of the end edges such that said shift amount is minimized, to adjust the corresponding to each signal mark the recording pulse.

  By this method, it is possible to optimize the recording pulse corresponding to the terminal edge of the signal mark group.

  Further, the recording method of the present invention irradiates an optical disc with a laser beam modulated with a recording pulse, generates a signal mark group on the optical disc, and then irradiates the optical disc with a reproduction laser beam, and the signal mark group and the space group. The reflected light modulated in accordance with the above is converted into an electric signal and generated as a binarized reproduction binary signal, a reproduction clock signal is generated based on the reproduction binarization signal, and the rise of the reproduction binarization signal is further generated. A clock punching binarized signal is generated by removing the fluctuation component of the falling portion using the reproduced clock signal, and the change point of the reproduced binarized signal corresponding to the start edge of the space group, The time with the change point of the clock punching binarized signal corresponding to the end edge of the space group is measured, and the time corresponding to the correct start edge position corresponding to each space is measured. The actual start edge shift amount is obtained, and the recording pulse corresponding to the end of the signal mark located in front of each space corresponding to each space is adjusted so that the shift amount is minimized. .

  By this method, the recording pulse corresponding to the start edge of the signal space group can be optimized.

  Further, the recording method of the present invention irradiates an optical disc with a laser beam modulated with a recording pulse, generates a signal mark group on the optical disc, and then irradiates the optical disc with a reproduction laser beam, and the signal mark group and the space group. The reflected light modulated in accordance with the above is converted into an electric signal and generated as a binarized reproduction binary signal, a reproduction clock signal is generated based on the reproduction binarization signal, and the rise of the reproduction binarization signal is further generated. A clock punching binarized signal is generated by removing the fluctuation component of the falling portion using the reproduced clock signal, and a change point of the clock punching binarized signal corresponding to the start edge of the space group, The time with the change point of the reproduced binary signal corresponding to the end edge of the space group is measured, and the time corresponding to the position of the correct end edge corresponding to each space is measured. That determines the actual shift amount of the end edges such that said shift amount is minimized, to adjust the said recording pulses corresponding to the beginning of the signal mark coming behind each space corresponding to each space.

  By this method, it is possible to optimize the recording pulse corresponding to the terminal edge of the signal space group.

  Further, the recording method of the present invention can be achieved by changing the write start timing and / or write end timing of the recording pulse corresponding to each signal mark as a recording pulse adjustment method.

  Also, the recording method of the present invention can be achieved by changing the laser power at the start of writing and / or the laser power at the end of writing of the recording pulse corresponding to each signal mark as a method for adjusting the recording pulse.

  In the recording method of the present invention, since the recording signal is composed of a random signal, it is possible to easily measure jitter performance, error rate, and the like.

  The recording apparatus of the present invention also includes a servo means for controlling the rotation of the disk and the position of the laser beam, a recording signal generating means for generating a recording signal, and modulating a laser based on the recording signal to generate a recording pulse. A signal recording means for irradiating the optical disc with signal recording, a signal reproducing means for irradiating the optical disc with a laser beam and converting the reflected light modulated by the signal mark into an electrical signal, and the reproduction output from the signal reproducing means Binarizing means for generating a binarized signal from the signal, regenerated clock generating means for receiving the binarized signal and generating a regenerated clock signal, and fluctuation components of the binary change point of the binarized signal A clock punching means for generating a clock punched binarized signal by removing the reproduced clock signal, and between the binarized signal and the clock punched binarized signal. A time interval measuring means for measuring a time interval of a constant binary change point, and a recording pulse of the recording signal generating means and / or the signal recording means based on a measurement result by the time interval measuring means. Feedback means for instructing adjustment is provided.

  With this configuration, the recording pulse can be optimized.

  In the recording apparatus of the present invention, the recording pulse adjustment method indicated by the feedback means changes the write start timing and / or write end timing of the recording pulse corresponding to each signal mark.

  With this configuration, the recording pulse can be adjusted.

  In the recording apparatus of the present invention, the recording pulse adjusting method indicated by the feedback means changes the laser power at the start of writing and / or the laser power at the end of writing of the recording pulse corresponding to each signal mark.

  With this configuration, the recording pulse can be adjusted.

  In the recording apparatus of the present invention, the recording signal generated by the recording signal generating means is a random signal.

  With this configuration, it is possible to easily measure jitter performance and error rate.

  As described above, according to the signal measuring method and the recording method and apparatus of the present invention, a random signal can be used to record a recording mark using a binary signal provided in a normal drive and a clock punching binary signal. Since the start and end deviations can be measured, the recording pulse can be optimized very easily.

  Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1)
FIG. 1 is an explanatory diagram of a signal mark measurement method according to Embodiment 1 of the present invention.

  In FIG. 1, 11 is a signal mark recorded on an information recording medium, and 12 is a signal space. Reference numeral 13 denotes a reproduction signal obtained by irradiating the signal mark 11 with a reproduction laser and converting the modulated reflected light into an electric signal. A reproduction binarized signal 15 is obtained by binarizing the reproduction signal 13 at a slice level 14 (usually binarized at a zero cross point of a signal that has passed through an equalizer amplifier and then AC coupling). A reproduction clock 16 is generated by PLL control based on the reproduction binary signal 15. A clock punched binarized signal 17 is obtained by punching the reproduced binarized signal 15 with the recovered clock 16 and removing the fluctuation component.

  The operation of punching out with the clock in FIG. 1 is performed by using a flip-flop having a structure in which when the clock level is HI, data is fetched from the reproduced binary signal 15 and the fetched data is output at the falling edge of the clock. A punching binarized signal 17 is generated.

  The characteristic of this clock punched binary signal is that the jitter component is so small that it can be ignored because it is synchronized with the recovered clock. Here, by measuring a large number of data including A1 and A2 which are time differences between the falling edge of the reproduced binary signal and the rising edge of the clock punched binary signal, the relative values between the signals at the beginning of the signal mark are measured. The amount of shift and the jitter at the beginning of each signal mark can be measured. Further, by measuring a large number of data including B1 and B2 which are time differences between the falling edge of the clock punching binarized signal and the rising edge of the reproduced binary signal, the relative values between the signals at the end of the signal mark are measured. The amount of shift and the jitter at the end of each signal mark can be measured.

  The histogram from I3 to I14 in FIG. 5 shows the measurement result of the start edge in the present embodiment, and J3 to J14 show the measurement result of the end edge in this embodiment using a commercially available time interval analyzer (hereinafter referred to as TIA). Used to display. The signal recorded on the information recording medium is an 8-16 modulated random signal used in DVD. Here, I4, which is the starting edge of the 4T signal, is shifted to the 5T side. That is, the starting edge of the 4T mark is shifted to the advance side.

  In a normal drive, since a reproduction binarization signal and a clock punching binarization signal are provided in the process of demodulating recording data, a circuit is hardly added.

  FIG. 2 is an explanatory diagram of the signal space measurement method according to Embodiment 1 of the present invention.

  2, since each signal is the same as FIG. 1, description is abbreviate | omitted. Here, by measuring a large number of data including C1 and C2, which is the time difference between the rising edge of the reproduced binary signal and the falling edge of the clock punched binary signal, the relative value between each signal at the beginning of the signal space is measured. Can be measured. In addition, by measuring a large number of data including D1 and D2, which are the time difference between the rising edge of the clock punching binarized signal and the falling edge of the reproduced binary signal, relative signals between the signals at the end of the signal space are measured. The amount of misalignment and the jitter at the end of each signal space can be measured.

  FIG. 6 is a block diagram of the signal measuring apparatus according to Embodiment 1 of the present invention. In FIG. 6, 61 is an optical disk, 62 is a disk rotating means, 63 is a servo means, 64 is a laser beam, 65 is a signal reproducing means, 66 is a binarizing means, 67 is a clock generating means, 68 is a clock punching means, 69 Is a time interval measuring means.

  The servo mark 63 accurately irradiates the recording mark onto the optical disk 61 attached to the disk rotating means 62. The reflected light modulated by the recording mark on the optical disc 61 is converted into an electric signal by the signal reproducing means 65 and becomes a reproduced signal. The reproduction signal is binarized by the binarization means 66 to become a binarized signal, and the reproduction clock is generated by PLL control by the clock generation means 67. Based on the binarized signal and the recovered clock, the clock punching means 68 generates a clock punched binary signal. The time interval measuring means for measuring the time interval between the binarized signal and the clock punched binarized signal makes it possible to measure the start and end of the signal mark and the edge shift between the start and end of the signal space. .

  As described above, according to the first embodiment of the present invention, since the binarizing means and the clock punching means are provided, it is possible to individually and easily measure the deviation amount of the signal mark and the signal space in the random signal. .

(Embodiment 2)
FIG. 3 is an explanatory diagram of a signal mark measurement method according to Embodiment 2 of the present invention.

  In FIG. 3, 31 is a signal mark recorded on the information recording medium, and 32 is a signal space. Reference numeral 33 denotes a reproduction signal obtained by irradiating the reproduction mark 31 with a reproduction laser and converting the modulated reflected light into an electric signal. A reproduction binarized signal 35 is obtained by binarizing the reproduction signal 33 by a predetermined method (usually binarizing at a zero cross point of a signal that has passed through an equalizer amplifier and then AC coupling). A reproduction clock 36 is generated by PLL control based on the reproduction binary signal 35. The clock binarized signal 37 is obtained by punching the reproduced binary signal 35 with the reproduced clock 36.

  The clock punching binarization signal 37 in FIG. 3 is set to HI only when the reproduction binarization signal 35 changes. Specifically, after the reproduction binarization signal 35 changes, the clock punching binarization signal 37 becomes HI for ½ clock in synchronization with the fall of the reproduction clock 36.

  The characteristic of this clock punched binary signal is that the jitter component is so small that it can be ignored because it is synchronized with the recovered clock. Further, in the second embodiment, a binary signal 38 obtained by delaying the reproduction binary signal 35 by about 1.5 clock width is used. Since this delayed reproduction binary signal 28 simply passes through the delay line, it has a deviation component of the reproduction binary signal 35 as it is. Here, by measuring a large number of data including E1 and E2, which is the time difference between the falling edge of the delayed reproduced binary signal and the rising edge of the clock punched binary signal, each signal at the beginning of the signal mark is measured. Can be measured. Further, by measuring a large number of data including F1 and F2 which are time differences between the rising edge of the clock punching binarized signal and the rising edge of the delayed reproduction binary signal, the relative values between the signals at the end of the signal mark are measured. Can be measured.

  FIG. 4 is an explanatory diagram of a signal space measuring method according to the second embodiment of the signal measuring method of the present invention.

  In FIG. 4, each signal is the same as in FIG. Here, by measuring a large number of data including G1 and G2, which are the time difference between the rise of the delayed reproduced binary signal and the rise of the clock punched binary signal, each signal at the beginning of the signal space is measured. Relative displacement can be measured. In addition, by measuring a large number of data including H1 and H2, which is the time difference between the rising edge of the clock punching binarized signal and the falling edge of the delayed reproduction binarized signal, the signals between the signals at the end of the signal space are measured. Relative displacement can be measured.

  FIG. 7 is a block diagram of a signal measuring apparatus according to Embodiment 2 of the present invention. In FIG. 7, 71 is an optical disk, 72 is a disk rotating means, 73 is a servo means, 74 is a laser beam, 75 is a signal reproducing means, 76 is a binarizing means, 77 is a clock generating means, 78 is a clock punching means, 79 Is a time interval measuring means, and 710 is a binary signal delay means.

  The recording mark is accurately irradiated by the servo means 73 onto the optical disk 71 attached to the disk rotating means 72. The reflected light modulated by the recording mark on the optical disc 71 is converted into an electric signal by the signal reproducing means 75 and becomes a reproduced signal. The reproduction signal is binarized by the binarization means 76 to become a binarized signal, and the reproduction clock is generated by PLL control by the clock generation means 77. Based on the binarized signal and the reproduction clock, the clock punching means 78 generates a clock punched binary signal. The clock punching binarized signal here is a type in which a short pulse stands at the changing point of the binarized signal, as described with reference to FIGS. Then, by the time interval measuring means for measuring the time interval between the binarized signal delayed by the delay means 710 and the clock punched binarized signal, the start and end of the signal mark, and the start and end edges of the signal space The deviation can be measured individually.

  As described above, according to the second embodiment of the present invention, since the binarizing means and the clock punching means are provided, the shift amount of the signal mark and the signal space can be measured individually and easily.

(Embodiment 3)
FIG. 8 is an explanatory diagram of the recording method of the signal mark start end in the third embodiment of the present invention.

  In FIG. 8, 81 is a signal mark recorded on the information recording medium by a recording pulse 80, and 82 is a signal space. Reference numeral 83 denotes a reproduction signal obtained by irradiating the signal mark 81 with a reproduction laser and converting the modulated reflected light into an electric signal. A reproduction binarized signal 85 is obtained by binarizing the reproduction signal 83 at the slice level 84. A reproduction clock 86 is generated by PLL control based on the reproduction binary signal 85. Then, the clock binarized signal 87 is obtained by punching the reproduced binarized signal 85 with the reproduced clock 86 and removing the fluctuation component.

  Here, by measuring a large number of data including the time difference K1 and K2 between the falling edge of the reproduced binary signal and the rising edge of the clock punched binary signal, the deviation of the start of the signal mark can be measured. A histogram of these data is L3 to L14. As a result, the L4 representing the start edge of the 4T signal is shifted to the 5T side here, so that the start edge of the 4T pulse in the recording pulse 80 is adjusted and the start edge of the signal mark 81 is shifted to the delay side. The quality of the recorded signal is improved.

  FIG. 9 is an explanatory diagram of a signal mark end recording method according to Embodiment 3 of the present invention.

  Each element in FIG. 9 is common to that in FIG.

  Here, the deviation of the end of the signal mark can be measured by measuring a large number of data including M1 and M2, which are the time difference between the falling edge of the clock punched binary signal and the rising edge of the reproduced binary signal. N3 to N14 are a histogram of these data. As a result, since N4 representing the end of the 4T signal is shifted to the 3T side here, by adjusting the end of the 4T pulse in the recording pulse 80 and shifting the end edge of the signal mark 81 to the delay side, The quality of the recorded signal is improved.

  FIG. 10 is an explanatory diagram of a recording method at the beginning of the signal space in the third embodiment of the present invention.

  Each element in FIG. 10 is the same as that in FIG. 8 and FIG.

  Here, by measuring a large number of data including O1 and O2, which are the time difference between the rising edge of the reproduced binary signal and the falling edge of the clock punched binary signal, the deviation of the signal space start edge can be measured. P3 to P14 are a histogram of these data. As a result, here, P3 representing the start end of the 3T space signal is shifted in the short direction. Therefore, by shifting the end edge of each mark in front of the 3T space in the recording pulse 80 toward the advance side, Since the length of the start end can be secured, the quality of the recording signal is improved.

  FIG. 11 is an explanatory diagram of a signal space end recording method according to Embodiment 3 of the present invention.

  Each element in FIG. 11 is the same as that in FIG. 8, FIG. 9, and FIG.

  Here, by measuring a large number of data including Q1 and Q2, which are the time difference between the rising edge of the clock punched binary signal and the falling edge of the reproduced binary signal, the deviation of the signal space start edge can be measured. A histogram of these data is R3 to R14. In this example, since it is shifted to the R3, 4T side representing the end of the 3T space signal, the start edge of each mark after the 3T space in the recording pulse 80 is shifted to the advancing side. Since the deviation can be adjusted, the quality of the recording signal is improved.

  12 to 14 are explanatory views showing an example of recording pulse adjustment in the recording method according to Embodiment 3 of the present invention.

  FIG. 12 shows a method of adjusting by moving the start end position and the end position of the recording pulse, and S1 to S4 indicate the advance direction of each edge. T1 to T4 represent the delay direction of each edge.

  FIG. 13 shows a method of adjusting the recording power at the beginning and the end of the recording pulse by moving, and U1 to U6 indicate the power addition direction of each edge. V1 to V6 indicate the direction of decreasing the power of each edge.

  FIG. 14 shows a method of adjusting by moving the position of the entire recording pulse. W1 and X1 indicate that the entire 3T pulse is moved to the advance side and the delay side. W2 and X2 represent moving the entire top pulse, and W3 and X3 represent moving the entire last pulse.

  Here, the recording pulse adjustment method is shown in three types here, but these may be used in combination.

  FIG. 15 is a block diagram of a recording apparatus according to Embodiment 3 of the present invention. In FIG. 15, reference numeral 151 denotes an optical disk, which is a commercially available DVD-R. 152 is a disk rotating means, 153 is a servo means, 154 is a laser beam, the wavelength is 658 nm, and the NA is 0.6. 155 is a signal reproducing means, 156 is a binarizing means, 157 is a clock generating means, 158 is a clock punching means, 159 is a time interval measuring means, and a commercially available TIA (Yokogawa TA720) is used. 1502 is feedback means, and 1501 is recording signal generation means, which uses a DVD-standard-compliant 8-16 modulated random signal. Reference numeral 1500 denotes signal recording means.

  The laser beam 154 is accurately irradiated by the servo means 153 onto the optical disk 151 attached to the disk rotating means 152. The random signal generated by the recording signal generation unit 1501 is converted into a recording pulse by the signal recording unit 1500, and the laser beam 154 is modulated to generate a recording mark on the optical disc. Thereafter, in the reproduction mode, the reflected light modulated by the recording mark on the optical disk 151 is converted into an electric signal by the signal reproduction means 155 to become a reproduction signal. The reproduction signal is binarized by the binarization means 156 to become a binarized signal, and the reproduction clock is generated by performing PLL control by the clock generation means 157. Based on the binarized signal and the reproduction clock, the clock punching means 158 generates a clock punched binary signal. Then, the time interval measuring means 159 for measuring the time interval between the binarized signal and the clock punched binarized signal individually measures the deviations of the start and end of the signal mark and the start and end edges of the signal space. Then, the feedback unit 1502 feeds back the edge shift amount to the recording signal generation unit 1501 and the signal recording unit 1500. In response to this deviation, the recording signal generation means 1501 and / or the signal recording means 1500 correct the edge position of the recording pulse and / or move the position of the entire pulse and / or change the laser power of the edge portion of the pulse. The edge shift amount is adjusted to the minimum.

  As described above, according to the third embodiment of the present invention, since the binarizing means and the clock punching means are provided, the deviation amount of the signal mark and the signal space can be easily measured, and the feedback means is also provided. Therefore, the write strategy can be easily optimized.

  Although the third embodiment has a form in which a recording function is added to the first embodiment, a recording function may be added to the second embodiment.

  The signal measuring method and the recording method according to the present invention are useful as a recording method for an optical disk because an optimum write strategy can be easily obtained. It can also be applied to recording applications such as magnetic recording and magneto-optical recording.

Explanatory drawing of the signal mark measuring method in Embodiment 1 of this invention Explanatory drawing of the signal space measuring method in Embodiment 1 of this invention Explanatory drawing of the signal mark measuring method in Embodiment 2 of this invention Explanatory drawing of the signal space measuring method in Embodiment 2 of the signal measuring method of this invention The figure which shows the measurement result histogram of the signal mark edge position in this Embodiment 1. Block diagram of a signal measuring apparatus according to Embodiment 1 of the present invention Block diagram of a signal measuring device according to Embodiment 2 of the present invention Explanatory drawing of the recording method of the signal mark start end in Embodiment 3 of this invention Explanatory drawing of the recording method of the signal mark end in Embodiment 3 of this invention Explanatory drawing of the recording method of the signal space start edge in Embodiment 3 of this invention. Explanatory drawing of the recording method of the signal space end in Embodiment 3 of this invention Explanatory drawing of the method of moving and adjusting the start and the end position of the recording pulse in Embodiment 3 of this invention Explanatory drawing of the method of moving and adjusting the recording power of the start of a recording pulse, and the end in Embodiment 3 of this invention Explanatory drawing of the method of moving and adjusting the position of the whole pulse in Embodiment 3 of this invention Block diagram of a recording apparatus according to Embodiment 3 of the present invention Explanatory drawing which shows an example of recording by the conventional mark edge recording system The figure which shows an example of the phase error table used for the conventional recording

Explanation of symbols

11, 31, 81, 161 Signal mark 12, 32, 82, 162 Signal space 15, 35, 85, 165 Reproduced binary signal 17, 37, 87 Clock punched binary signal 61, 71, 151 Optical disc 62, 72 , 152 Disc rotating means 63, 73, 153 Servo means 64, 74, 154 Laser beam 65, 75, 155 Signal reproducing means 66, 76, 156 Binary means 68, 78, 158 Clock punching means 69, 79, 159 Time Interval measuring means 1500 Signal recording means 1501 Recording signal generating means 1502 Feedback means

Claims (16)

A reproduction binary signal obtained by binarizing the reproduction signal modulated by the signal mark group and the signal space group of the information recording medium, a reproduction clock signal based on the reproduction binary signal, and a reproduction binary signal A clock punching binarized signal in which the fluctuation component of the rising and falling parts of the digitized signal is removed using the reproduced clock signal,
Measure the time between the change point of the reproduced binary signal corresponding to the start edge of the signal mark group and the change point of the clock punched binary signal corresponding to the end edge of the signal mark group,
Measure the deviation amount of the start edge position of each signal mark,
Further, the time between the changing point of the clock punching binarized signal corresponding to the start edge of the signal mark group and the changing point of the reproduction binarized signal corresponding to the terminal edge of the signal mark group is measured,
A signal measurement method characterized by measuring a deviation amount of a terminal edge position of each signal mark. A reproduction binary signal obtained by binarizing the reproduction signal modulated by the signal mark group and the signal space group of the information recording medium, a reproduction clock signal based on the reproduction binary signal, and a reproduction binary signal A clock punching binarized signal in which the fluctuation component of the rising and falling parts of the digitized signal is removed using the reproduced clock signal,
Measuring the time between the change point of the reproduced binary signal corresponding to the start edge of the signal space group and the change point of the clock punched binary signal corresponding to the end edge of the signal space group;
Measure the deviation amount of the start edge position of each signal space,
Further, the time between the change point of the clock punched binarized signal corresponding to the start edge of the signal space group and the change point of the reproduced binary signal corresponding to the end edge of the signal space group is measured,
A signal measurement method characterized by measuring a deviation amount of a terminal edge position of each signal space. 3. The signal measuring method according to claim 1, wherein the signal mark group and the space group recorded on the information recording medium are constituted by random signals. The signal measurement method according to claim 1, wherein the signal mark group is formed by irradiating the optical recording material with a light beam. A disc rotating means for clamping and rotating the optical disc;
A signal reproducing means for irradiating the optical disc with a laser beam and converting the reflected light modulated by the signal mark into an electrical signal;
Servo means for controlling the rotation of the optical disc and the position of the laser beam;
Binarization means for generating a binarized signal from the reproduction signal output from the signal reproduction means;
Regenerated clock generating means for receiving the binarized signal and generating a regenerated clock signal;
Clock punching means for removing a fluctuation component of a binary change point of the binarized signal using the reproduced clock signal and generating a clock punched binary signal;
An optical disc signal measuring apparatus comprising: a time interval measuring means for measuring a time interval of a predetermined binary change point between the binarized signal and the clock punched binarized signal. The optical disk is irradiated with a laser beam modulated with a recording pulse, a signal mark group is generated on the optical disk, a playback laser beam is irradiated on the optical disk, and the reflected light modulated by the signal mark group and the space group is an electrical signal. Generated as a binarized playback binary signal converted into
A clock punching binarized signal generated by generating a regenerated clock signal based on the regenerated binarized signal, and further removing fluctuation components at the rising and falling parts of the regenerated binarized signal using the regenerated clock signal; Generate
Each signal mark is measured by measuring the time between the change point of the reproduced binary signal corresponding to the start edge of the signal mark group and the change point of the clock punched binary signal corresponding to the end edge of the signal mark group. The actual start edge shift amount with respect to the correct start edge position corresponding to is obtained, and the recording pulse corresponding to each signal mark is adjusted so that the shift amount is minimized. Recording method of information recording medium. The optical disk is irradiated with a laser beam modulated with a recording pulse, a signal mark group is generated on the optical disk, a playback laser beam is irradiated on the optical disk, and the reflected light modulated by the signal mark group and the space group is an electrical signal. Generated as a binarized playback binary signal converted into
A clock punching binarized signal generated by generating a regenerated clock signal based on the regenerated binarized signal, and further removing fluctuation components at the rising and falling parts of the regenerated binarized signal using the regenerated clock signal; Generate
Each signal mark is measured by measuring the time between the change point of the clock punched binary signal corresponding to the start edge of the signal mark group and the change point of the reproduced binary signal corresponding to the end edge of the signal mark group. The actual end edge shift amount with respect to the correct end edge position corresponding to is obtained, and the recording pulse corresponding to each signal mark is adjusted so that the shift amount is minimized, Recording method of information recording medium. The optical disk is irradiated with a laser beam modulated with a recording pulse, a signal mark group is generated on the optical disk, a playback laser beam is irradiated on the optical disk, and the reflected light modulated by the signal mark group and the space group is an electrical signal. Generated as a binarized playback binary signal converted into
A clock punching binarized signal generated by generating a regenerated clock signal based on the regenerated binarized signal, and further removing fluctuation components at the rising and falling parts of the regenerated binarized signal using the regenerated clock signal; Generate
The time between the change point of the reproduced binary signal corresponding to the start edge of the space group and the change point of the clock punched binary signal corresponding to the end edge of the space group is measured, and each space is measured. The shift amount of the actual start edge with respect to the corresponding correct start edge position is obtained, and the end of the signal mark located in front of each space corresponding to each space is determined so that the shift amount is minimized. A recording method for an information recording medium, wherein the recording pulse is adjusted. The optical disk is irradiated with a laser beam modulated with a recording pulse, a signal mark group is generated on the optical disk, a playback laser beam is irradiated on the optical disk, and the reflected light modulated by the signal mark group and the space group is an electrical signal. Generated as a binarized playback binary signal converted into
A clock punching binarized signal generated by generating a regenerated clock signal based on the regenerated binarized signal, and further removing fluctuation components at the rising and falling parts of the regenerated binarized signal using the regenerated clock signal; Generate
The time between the change point of the clock punching binarization signal corresponding to the start edge of the space group and the change point of the reproduction binarization signal corresponding to the end edge of the space group is measured, and each space is measured. The shift amount of the actual end edge with respect to the corresponding correct end edge position is obtained, and the shift amount is minimized, so that the shift amount is minimized, and the signal mark corresponding to the start end of the signal mark that follows each space corresponds to the space. A recording method of an information recording medium, characterized by adjusting a recording pulse. 10. The information according to claim 6, wherein the recording pulse adjustment method changes a write start timing or a write end timing of a recording pulse corresponding to each signal mark. 11. Recording method of recording medium. The information according to any one of claims 6 to 9, wherein the recording pulse adjustment method changes a laser power at the start of writing or a laser power at the end of writing of the recording pulse corresponding to each signal mark. Recording method of recording medium. 12. The information recording medium recording method according to any one of claims 6 to 11, wherein the recording signal is a random signal. Servo means for controlling the rotation of the disk and the position of the laser beam;
Recording signal generating means for generating a recording signal;
A signal recording means for modulating a laser based on the recording signal, generating a recording pulse and irradiating the optical disc to record the signal;
A signal reproducing means for irradiating the optical disc with a laser beam and converting the reflected light modulated by the signal mark into an electrical signal;
Binarization means for generating a binarized signal from the reproduction signal output from the signal reproduction means;
Regenerated clock generating means for receiving the binarized signal and generating a regenerated clock signal;
Clock punching means for removing a fluctuation component of a binary change point of the binarized signal using the reproduced clock signal and generating a clock punched binary signal;
A time interval measuring means for measuring a time interval of a predetermined binary change point between the binarized signal and the clock punched binarized signal;
An information recording medium comprising feedback means for instructing the recording signal generating means and / or the signal recording means to adjust a recording pulse based on a measurement result by the time interval measuring means. Recording device. 14. The information recording medium according to claim 13, wherein the recording pulse adjustment method instructed by the feedback means changes a write pulse start timing and / or a write end timing corresponding to each signal mark. Recording device. 14. The information recording according to claim 13, wherein the recording pulse adjustment method instructed by the feedback means changes the laser power at the start of writing or the laser power at the end of writing of the recording pulse corresponding to each signal mark. Media recording device. 16. The information recording medium recording apparatus according to claim 13, wherein the recording signal generated by the recording signal generating means is a random signal.

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