JP2004047109A - Optical disk medium and optical disk drive - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To highly reliably reproduce data by optimization learning about a radial tilt position of an optical head. <P>SOLUTION: An optical disk unit has a jitter amount measuring means 41 for detecting the amount of a jitter from a reproduced signal, a radial tilt position changing means 43 for changing the radial tilt positions of the optical head, and a radial tilt position learning means 42 for judging the radial tilt position at which the amount of the jitter becomes minimum on the basis of an output signal of the jitter amount measuring means 41 at different radial tilt positions to set the radial tilt at an optimum position. <P>COPYRIGHT: (C)2004,JPO

Description

The present invention relates to an information reproducing apparatus for recording and reproducing a digital signal, and more particularly to an optical disk apparatus and an optical disk medium for optically recording and reproducing.

In recent years, optical disk devices have been actively developed as means for recording and reproducing large amounts of data, and approaches to achieve higher recording densities have been made. The problem in achieving such a high recording density is to improve the signal-to-noise ratio and the interference between recording pits, and at the same time, to compensate the signal quality for variations in the optical disk medium and the optical disk device. This is especially true for defocus, off-track (displacement of the light spot from the track center), tangential tilt (inclination in the tangential direction of the recording track), radial tilt, which is represented as a variation in the positional relationship between the optical head and the optical disk medium. It is pointed out that the characteristics of the reproduction channel change due to (inclination in the radial direction of the disk) and the like, and there is a demand for a device that has a small increase in the error rate due to these.

Hereinafter, an example of a reproducing method of the above-described conventional optical disk device will be described with reference to the drawings.

FIG. 11 is a diagram showing a recording area of a conventional optical disk medium, and FIG. 12 is a configuration diagram of a conventional optical disk device. FIG. 13 is a configuration diagram of the PLL in FIG.

In FIG. 11, 111 is an optical disk medium, 112 is a track, 113 is a data area where digital data is recorded, and 114 is a pit.

In FIG. 12, 122 is an optical system, 123 is a semiconductor laser LD, 124 is a pin photodiode PD, 125 is a preamplifier, 126 is a waveform equalizer, 127 is a shaper, 129 is a PLL, and 1211 is demodulation / error correction means. .

In FIG. 13, 131 is a phase comparator, 132 is a low-pass filter, 133 is a VCO, 134 is a frequency divider, 135 is a gate circuit, and 138 is a D-type flip-flop.

In FIG. 11, on an optical disk medium 111, a program such as compressed audio and image information is digitally modulated as digital data, and a row of pits 114 formed in a concave and convex manner so that the length changes according to a predetermined rule forms a track 112. As it is configured, it is spirally arranged from the inner peripheral part to the outer peripheral part, and is recorded over the entire data area so that the light spot can be tracked by this arrangement.

In FIG. 12, the output light of the semiconductor laser 123 is processed by the optical system 122 and collected as a light spot on the optical disk medium 111, and the reflected light is incident on the pin photodiode 124. The preamplifier 125 amplifies the change in reflected light detected by the pin photodiode 124, and as a result, outputs a reproduced signal that changes due to a change in pit length on the optical disk medium. The reproduced signal is converted by the waveform equalizer 126 into a signal with small waveform interference, and is converted by the shaper 127 into a pulse signal 128 indicating the presence or absence of the signal. The signal 128 is input to the PLL 129, and outputs a binary signal 1210 which is read data recorded on the optical disk medium 111. The demodulation / error correction means 1211 performs demodulation / error correction processing to obtain an error-free digital data signal 1212. Is output.

13, when the pulse signal 128 is input to the phase comparator 131, the phase comparator 131 detects the phase difference between the input signal 128 and the output signal of the gate circuit 135, and detects the phase difference and the frequency difference between the two input signals. Generates an error voltage 139 related to. Only the low-frequency component of the error voltage 139 is extracted by the low-pass filter 132 and becomes the control voltage of the VCO 133. VCO 133 generates clock signal 137 at a frequency determined by the control voltage. The clock signal 137 is frequency-divided by the frequency dividing circuit 134, and only the signal corresponding to the pulse signal 128 is output by the gate circuit 135. At this time, the VCO is controlled so that the phases of the two input signals become equal, and as a result, a synchronization signal 136 in which the pulse signal 128 is synchronized with its basic period is obtained. The signal 136 is input to the D-type flip-flop 138, and outputs a binary signal 1210.

It is noted that optical discs are interchangeable as a feature of optical discs, and the performance of compensating for the above-mentioned variations has become a problem with the progress of higher density. For example, between the inner and outer circumferences of the disk, in addition to the variations in the molding of the disk and the state of the reflective film, the parallelism between the optical head and the disk shifts due to the warpage of the disk, causing tilt in the radial and tangential directions of the disk. However, the reproduction signal quality deteriorates due to the tilt. In addition, the mounting of the disc is supported by the center using the center hole, so that a tilt change occurs even when the disc is mounted.

However, the above-described configuration has a problem that, when the density is further increased, variation between optical disk media or between devices is increased, and reliability is reduced.

In view of the above problems, the present invention provides an optical disc medium having an area for automatically adjusting an optical head in an area different from a data area for recording information.

Further, in view of the above problems, the present invention provides an optical disk apparatus which reproduces the area for automatic adjustment and enables automatic adjustment of an optical head.

In order to solve the above problem, the optical disk medium of the present invention has a random signal recorded on three adjacent tracks.

In the optical disc medium of the present invention, a random signal is recorded on tracks at both ends of three adjacent tracks, and a signal composed of signals of a minimum inversion interval and a maximum inversion interval of a modulation method in a data area is recorded in a center track. Is recorded.

In the optical disc medium of the present invention, signals at the maximum inversion interval of the modulation method in the data area are recorded on tracks at both ends of three adjacent tracks, and a random signal is recorded on the center track.

In the optical disk medium of the present invention, signals at the maximum inversion interval of the modulation scheme in the data area are recorded on the tracks at both ends of three adjacent tracks, and the minimum inversion interval of the modulation scheme in the data area is recorded on the center track. A signal composed of signals at the maximum inversion interval is recorded.

In the optical disk medium of the present invention, the track width of the data area differs from the track width of part or all of three adjacent tracks.

Further, the optical disc apparatus of the present invention includes a jitter amount measuring means for detecting a jitter amount from a reproduced signal, a radial tilt position changing means for changing a radial tilt position of the optical head, and an output of the jitter amount measuring means at different radial tilt positions. There is provided a radial tilt position learning means for determining a radial tilt position at which a jitter amount becomes minimum from a signal.

Also, the optical disc apparatus of the present invention includes a jitter amount measuring means for detecting a jitter amount from a reproduced signal, a tangential tilt position changing means for changing a tangential tilt position of the optical head, and the jitter amount measurement at different tangential tilt positions. There is provided a tangential tilt position learning means for judging a tangential tilt position at which the amount of jitter is minimized from an output signal of the means.

Further, the optical disc apparatus of the present invention comprises: a jitter amount measuring means for detecting a jitter amount from a reproduced signal; a focus position varying means for changing a focus position of an optical head; and a jitter amount measuring means for detecting a jitter amount from an output signal of the jitter amount measuring means at different focus positions. There is a focus position learning means for determining a focus position at which the amount becomes minimum.

Further, the optical disc apparatus of the present invention includes a jitter amount measuring means for detecting a jitter amount from a reproduced signal, an off-track position varying means for changing an off-track position of the optical head, and an output of the jitter amount measuring means at different off-track positions. An off-track position learning means for determining an off-track position at which the amount of jitter is minimized from a signal is provided.

The optical disk medium and the optical disk device of the present invention perform learning to optimize the radial tilt position of the optical head by reproducing a predetermined area before reproducing a program after mounting the disk by the above-described configuration. To improve the error rate during program playback.

Further, the optical disk medium and the optical disk apparatus of the present invention perform learning for optimizing the tangential tilt position of the optical head by reproducing a predetermined area before reproducing a program after mounting the disk by the above-described configuration. Thereby, the error rate at the time of reproducing the program is improved.

Further, the optical disk medium and the optical disk apparatus of the present invention perform learning for optimizing the focus position of the optical head by reproducing a predetermined area before reproducing a program after mounting the disk by the above configuration. As a result, the error rate at the time of reproducing the program is improved.

Further, the optical disk medium and the optical disk apparatus of the present invention perform learning for optimizing the off-track position of the optical head by reproducing a predetermined area before reproducing a program after mounting the disk by the above configuration, This achieves an improvement in the error rate during program reproduction.

As described above, the present invention provides a learning area in which predetermined data is recorded, reproduces the learning area, and optimizes the radial tilt position, the tangential tilt position, the focus position, and the off-track position of the optical head, thereby achieving high reliability. An object of the present invention is to provide an optical disk medium and an optical disk apparatus which realize an automatic adjustment function for compensating for a change in the reproduction characteristics of a disk caused by an optical disk medium, an optical disk apparatus, and a combination thereof.

補償 Further, by setting the learning area at each of the inner peripheral portion and the outer peripheral portion, compensation over the entire circumference can be performed.

Furthermore, by making the track width of part or all of the learning area narrower than the track width of the data area, the accuracy of adjustment is increased by increasing the amount of crosstalk, which is leakage of signals from tracks adjacent to the reproduction track. It can be further improved.

(Example)
Hereinafter, an optical disk medium and an optical disk device according to an embodiment of the present invention will be described with reference to the drawings. The same components as those in the conventional example are denoted by the same reference numerals, and description thereof will be omitted or simplified.

FIG. 1 shows the configuration of the optical disk medium according to the first embodiment of the present invention. In FIG. 1, 1 is an optical disk medium, 2 is a data area, 3 is a learning area on the inner peripheral part, and 4 is a learning area on the outer peripheral part.

Predetermined data is recorded in the learning areas 3 and 4 of the optical disk medium 1. When the optical disk medium 1 is mounted on the optical disk apparatus, the optical disk apparatus accesses the inner learning area and reproduces the learning area 3. Start.

Here, depending on the molding of the optical disk medium 1 and the variation or warpage of the state of the reflection film, the tilt amount may mainly change between the inner peripheral portion and the outer peripheral portion.

In this case, it is desirable to change the compensation amount over the entire circumference of the disk according to the change in the tilt amount. In the above-described operation, the learning result in the learning region 3 in the inner peripheral portion is held in the learning means, and learning is performed in the learning region 4 in the outer peripheral portion to obtain the learning result in the outer peripheral portion. It is possible to set the compensation amounts in all the areas from the results in the circumference.

Fig. 2 shows the structure of the learning area. In FIG. 2, 21 is a track, 22 is a pit, and 23 is a learning track. In this embodiment, the learning area is composed of three tracks.

For convenience of explanation, a pit row of one lap continuously reproduced is referred to as a track even when there are no grooves or the like separating adjacent pits in the radial direction of the disc only in the case where pits are arranged in a read-only disc or the like. A virtual boundary 24 is provided. Furthermore, the distance between two adjacent virtual boundaries is referred to as a track width. In this embodiment, the track widths of all the regions in FIG. 1 are equal.

In the case of a rewritable RAM disk or the like having a land portion and a groove portion, such as a rewritable RAM disk, as shown in FIG. In this case, the boundary 24 is considered as a groove. When recording is performed on both the land portion and the groove portion, a region sandwiched between two adjacent boundaries 24 corresponds to the land portion or the groove portion.

FIG. 3 shows the signals recorded on the learning track 23. In FIG. 3, a random signal 35 is recorded on the first track 32. On the second track 33, a random signal 36 is recorded. On the third track 34, a random signal 37 is recorded.

で は In the case of a rewritable RAM disk, it should be recorded at the time of shipment. In this embodiment, the signal recorded in the data area is a signal obtained by EFM-modulating digital data. However, the effect of the present invention is the same when other modulation methods are used.

ラ ン ダ ム The random signal in FIG. 3 is a signal in which 3T to 11T signals of the EFM modulation are distributed. Note that T is the reciprocal of the fundamental frequency and is the window width. Speaking of these as pits on the optical disk medium, a concave portion having a length corresponding to a 3T signal is changed from a concave portion (nine types) corresponding to an 11T signal, and a convex portion having a length corresponding to a 3T signal is converted into an 11T signal. This is a state in which projections (9 types) of corresponding lengths are combined.

FIG. 4 shows the configuration of the optical disk device of the present embodiment. In FIG. 4, 41 is a jitter amount measuring means, 42 is a radial tilt position learning means, and 43 is a radial tilt position varying means.

FIG. 5 shows the configurations of the jitter amount measuring means 41 and the PLL 129. In FIG. 5, 51 is a high-pass filter, 52 is an A / D converter, and 54 is a detector.

FIG. 6 shows the configuration of the radial tilt position changing means 43. 6, reference numeral 61 denotes a pedestal supporting the optical system 122; 62, a screw for tilting the pedestal 61; 65, a fulcrum when the pedestal is tilted; and 67, a radial tilt position variable circuit. The screw 62 is moved up and down by a radial tilt position variable circuit 67. An optical head 64 includes an optical system 122, a radial tilt position variable circuit 67, and the like, and moves left and right on the paper.

動作 The operation at the time of learning will be described below. When the optical disk medium 1 is mounted on the optical disk device, the optical disk device reproduces the second track 33 of the learning track 23.

In FIG. 4, the output light of the semiconductor laser 123 is processed by the optical system 122 and collected as a light spot on the optical disk medium 1, and the reflected light is incident on the pin photodiode 124. The preamplifier 125 amplifies the change in reflected light detected by the pin photodiode 124, and as a result, outputs a reproduced signal that changes due to a change in pit length on the optical disk medium. The reproduced signal is converted by the waveform equalizer 126 into a signal with small waveform interference, converted by the shaper 127 into a pulse signal 128 indicating the presence or absence of the signal, and input to the PLL 129.

At this time, the signal 128 includes crosstalk due to reflected and diffracted light from an adjacent track due to radial tilt (tilt in the disk radial direction), off-track (displacement of the spot from the track center), and tangential tilt (recording track tangential direction). Jitter) due to a decrease in reproduced signal amplitude due to off-track, defocus (defocus), aging of the disk, circuit noise, etc., and waveform interference (the effect of preceding and succeeding marks when the mark interval is narrow). And a time lag with respect to the original signal. As the amount of jitter increases, read errors in the reproduction system increase.

5, when the pulse signal 128 is input to the phase comparator 131, the phase comparator 131 detects the phase difference between the input signal 128 and the output signal of the gate circuit 135, and detects the phase difference and the frequency difference between the two input signals. Generates an error voltage 139 related to. Only the low-frequency component of the error voltage 139 is extracted by the low-pass filter 132 and becomes the control voltage of the VCO 133. VCO 133 generates clock signal 137 at a frequency determined by the control voltage. The clock signal 137 is frequency-divided by the frequency dividing circuit 134, and only the signal corresponding to the pulse signal 128 is output by the gate circuit 135. At this time, the VCO is controlled so that the phases of the two input signals become equal, and as a result, a synchronization signal 136 in which the pulse signal 128 is synchronized with its basic period is obtained.

The error voltage 139 is input to the jitter amount measuring means 41 on the other hand. In FIG. 5, only the high-frequency component of the error voltage 139 is extracted by the high-pass filter 51 and detected by the detector 54 to become a signal 53. The larger the jitter amount of the signal 128, the larger the signal 53. After the signal 53 is digitized by the A / D converter 52, it is input to the radial tilt position learning means 42, and is held as a jitter amount at the current radial tilt position.

(5) The jitter amount is measured while changing the radial tilt position by a constant amount by the radial tilt position changing means 43, and the value is held in the radial tilt position learning means 42.

By changing the radial tilt position, the relative angle of the optical head 64 and the optical disk medium 1 in the disk radial direction changes, and a signal from the first track 32 or the third track 34 of the learning track 23 leaks to the second track 33. The amount of crosstalk to be incorporated changes, which changes the waveform of the reproduced signal and the amount of jitter.

Therefore, when there are two positions where the jitter amount is the smallest or the position where the jitter amount is the minimum, the center position is the position where the influence from the adjacent tracks is the least.

This cycle is continued until the radial tilt position learning means 42 determines the optimum radial tilt position in each of the inner and outer learning tracks. When all the measurements are completed, the optimum radial tilt position in each region is determined. FIG. 34 shows an example of a learning flowchart.

As described above, by performing learning of the radial tilt position using the optical disc medium of the present embodiment, it is possible to reproduce at the optimal radial tilt position with a small crosstalk amount from both adjacent tracks for each area. Reproduction can be performed with high reliability.

Further, by providing the learning track 23 and reproducing the same track at all times as in this embodiment, if the radial tilt position learning means 42 is provided with a storage means, it can be compared with the data at the time of shipping or past learning. Can be used as a means for checking the operation state.

The learning in this embodiment is performed when the disc is mounted. However, the learning may be performed as many times as possible when the disk is used in a place where there is a lot of vibration, as well as when the disk is restarted due to some abnormality during use.

In the present embodiment, the waveform equalizer 126 is used. However, if it is difficult to obtain a difference in the amount of jitter at each radial tilt position by performing waveform equalization, the output of the preamplifier 125 is used during learning. , And waveform equalization need not be performed.

In the present embodiment, a method of tilting the pedestal 61 with the screw 62 is used as the configuration of the radial tilt position changing means 43. However, it is possible to change the relative angle of the optical head 64 and the optical disk medium 1 in the disk radial direction. Any configuration is possible as long as it is possible.

In this embodiment, as an example of the configuration of the jitter amount measuring means 41, a method is used in which the output of the phase comparator 131 of the PLL 129 is input to the high-pass filter 51 and A / D converted through the detector 54. Alternatively, any configuration may be used as long as the configuration detects the amount related to the jitter amount.

Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. FIG. 7 is a configuration diagram of an optical disk device according to a second embodiment of the present invention.

In FIG. 7, 41 is a jitter amount measuring means, 71 is a tangential tilt position learning means, and 72 is a tangential tilt position varying means.

FIG. 8 shows the configuration of the tangential tilt position changing means 72. 8, reference numeral 61 denotes a pedestal supporting the optical system 122; 62, a screw for tilting the pedestal 61; 65, a fulcrum when the pedestal is tilted; and 82, a tangential tilt position variable circuit. The screw 62 is moved up and down by a variable tangential tilt position circuit 82. Reference numeral 81 denotes an optical head provided with an optical system 122, a tangential tilt position variable circuit 82, and the like, which moves in a vertical direction toward the paper surface.

The optical disc device of the present embodiment includes a tangential tilt position learning device 71 and a tangential tilt position changing device 72 instead of the radial tilt position learning device 42 and the radial tilt position changing device 43 in the optical disc device of the first embodiment. The same applies to other configurations and optical disk media to be used.

In this embodiment, the jitter amount is measured while changing the tangential tilt position by a fixed amount by the tangential tilt position changing means 72, and the value is held in the tangential tilt position learning means 71.

By changing the tangential tilt position, the relative angle in the tangential direction of the recording track between the optical head 64 and the optical disk medium 1 changes, and the amplitude of the reproduction signal of the second track 33 of the learning track 23 changes, thereby reducing the amount of jitter. Change.

This cycle is continued until the tangential tilt position learning means 71 determines the optimum tangential tilt position in the inner and outer learning tracks, and when all the measurements are completed, the optimum tangential tilt position in each area is determined.

As described above, by learning the tangential tilt position using the optical disk medium of the present embodiment, it becomes possible to reproduce at the optimum tangential tilt position where the reproduction signal amplitude is large for each area, and higher reliability is obtained. Can be played back.

Further, by providing the learning track 23 and reproducing the same track at all times as in the present embodiment, if the tangential tilt position learning means 71 is provided with a storage means, the tangential tilt position learning means 71 can store data at the time of shipping or past learning. Since the comparison becomes possible, it can be used as a means for checking the operation state.

The learning in this embodiment is performed when the disc is mounted. However, the learning may be performed as many times as possible when the disk is used in a place where there is a lot of vibration, as well as when the disk is restarted due to some abnormality during use.

In this embodiment, the tangential tilt position varying means 72 uses a method in which the pedestal 61 is tilted by the screw 62, but the relative angle of the optical head 81 and the optical disk medium 1 in the tangential direction of the recording track is changed. Any configuration is possible as long as the configuration is possible.

Hereinafter, a third embodiment of the present invention will be described with reference to the drawings. FIG. 9 is a configuration diagram of an optical disc device according to a third embodiment of the present invention.

In FIG. 9, 41 is a jitter amount measuring means, 91 is a focus position learning means, 92 is a focus position variable means, and 93 is a focus servo circuit.

The optical disk device of the present embodiment is provided with a focus position learning unit 91 and a focus position variable unit 92 instead of the radial tilt position learning unit 42 and the radial tilt position variable unit 43 in the optical disk device of the first embodiment. The other configuration and the optical disk medium to be used are the same.

The focus position changing means 92 includes, for example, a D / A converter, and shifts the focus position by applying a voltage corresponding to the signal of the focus position learning means 91 to the focus error signal of the focus servo circuit 93 as an offset voltage.

In the present embodiment, the jitter amount is measured while changing the focus position by a fixed amount by the focus position varying means 92, and the value is held in the focus position learning means 91. By changing the focus position, the amplitude of the reproduction signal of the second track 33 of the learning track 23 changes, thereby changing the amount of jitter.

This cycle is continued until the focus position learning means 91 determines the optimum focus positions in the inner and outer learning tracks, and when all the measurements are completed, the optimum focus positions in each area are determined.

As described above, by learning the focus position using the optical disc medium of the present embodiment, it becomes possible to reproduce at the optimum focus position where the reproduction signal amplitude is large for each region, and the reproduction can be performed with higher reliability. Will be.

Further, by providing the learning track 23 and always reproducing the same track as in this embodiment, if the focus position learning means 91 is provided with a storage means, comparison with data at the time of shipment or past learning can be made. Since it becomes possible, it can be used as means for checking the operation state.

The learning in this embodiment is performed when the disc is mounted. However, the learning may be performed any number of times during use, such as when restarting due to some abnormality during use.

Hereinafter, a fourth embodiment of the present invention will be described with reference to the drawings. FIG. 10 is a configuration diagram of an optical disk device according to a fourth embodiment of the present invention.

In FIG. 10, 41 is a jitter amount measuring means, 101 is an off-track position learning means, 102 is an off-track position varying means, and 103 is a tracking servo circuit.

The optical disk device of the present embodiment is provided with an off-track position learning device 101 and an off-track position variable device 102 in place of the radial tilt position learning device 42 and the radial tilt position variable device 43 in the optical disk device of the first embodiment. The same applies to other configurations and optical disk media to be used.

The off-track position variable means 102 includes, for example, a D / A converter, and applies a voltage corresponding to a signal of the off-track position learning means 101 to a tracking error signal of the tracking servo circuit 103 as an offset voltage to set the off-track position. Stagger.

In the present embodiment, the jitter amount is measured while changing the off-track position by a fixed amount by the off-track position variable means 102, and the value is held in the off-track position learning means 101.

By changing the off-track position, the amplitude of the reproduction signal of the second track 33 of the learning track 23 changes, and when approaching the first track 32 or the third track 34, the amount of crosstalk changes, thereby reducing the amount of jitter. Change.

This cycle is continued until the off-track position learning means 101 determines the optimum off-track position in the inner and outer learning tracks. When all the measurements are completed, the optimum off-track position in each area is determined.

As described above, by learning the off-track position using the optical disk medium of the present embodiment, it becomes possible to reproduce at the optimal off-track position where the reproduction signal amplitude is large and the crosstalk amount is small for each region. Reproduction can be performed with high reliability.

Also, by providing the learning track 23 and reproducing the same track at all times as in the present embodiment, if the off-track position learning means 101 is provided with a storage means, it can be compared with data at the time of shipment or past learning. Can be used as a means for checking the operation state.

The learning in this embodiment is performed when the disc is mounted. However, the learning may be performed any number of times, such as when restarting due to some abnormality during use.

Hereinafter, a fifth embodiment of the present invention will be described with reference to the drawings. FIG. 14 is an explanatory diagram of signals recorded on the learning track 23 of the optical disc medium according to the fifth embodiment of the present invention.

In FIG. 14, a random signal 145 is recorded on the first track 32. The worst pattern signal 146 is recorded on the second track 33. On the third track 34, a random signal 147 is recorded.

で は In the case of a rewritable RAM disk, it should be recorded at the time of shipment. In this embodiment, the signal recorded in the data area is a signal obtained by EFM-modulating digital data. However, the effect of the present invention is the same when other modulation methods are used.

At this time, the 3T signal in the EFM modulation corresponds to, for example, a 2T signal in the 1-7 modulation, and the 11T signal in the EFM modulation corresponds to an 8T signal in the 1-7 modulation. That is, the 3T signal in this embodiment may correspond to the minimum inversion interval in another modulation scheme, and the 11T signal may correspond to the maximum inversion interval in another modulation scheme.

ラ ン ダ ム The random signal in FIG. 14 is a signal in which EFM modulated 3T to 11T signals are distributed. Speaking of these as pits on the optical disk medium, a concave portion having a length corresponding to a 3T signal is changed from a concave portion (nine types) corresponding to an 11T signal, and a convex portion having a length corresponding to a 3T signal is converted into an 11T signal. This is a state in which projections (9 types) of corresponding lengths are combined.

The worst pattern signal 146 is, for example, a signal having only the 3T signal and the 11T signal as shown in FIG. 32, a pit, a concave portion having a length corresponding to the 11T signal, a convex portion having a length corresponding to the 3T signal, It is a continuous pattern of a concave portion having a length corresponding to the 11T signal, a convex portion having a length corresponding to the 11T signal, a concave portion having a length corresponding to the 3T signal, and a convex portion having a length corresponding to the 11T signal.

In the case of a disk medium or the like having an address in which an address, ECC, or the like is added to a worst pattern signal in a sector as shown in FIG. 35, it is sufficient that a large number of worst pattern signal components are included.

The optical disk medium of this embodiment has the same configuration as that of the optical disk medium of the first embodiment except for the difference in signals recorded on the learning track 23. For example, the radial tilt position learning means described in the first embodiment When mounted on an optical disk device having the learning track, the radial tilt position is changed by a constant amount by the radial tilt position changing means 43 while reproducing the second track 33 of the learning track, and the jitter amount measuring means 41 changes the radial tilt position at that position. Is measured and held in the radial tilt position learning means 42. When the radial tilt position learning means 42 determines the optimum radial tilt position in the inner and outer learning tracks, the measurement is terminated and the optimum radial tilt position in each area is determined.

The worst pattern signal 146 of the second track 33 of the learning track 23 of the optical disk medium of this embodiment has more isolated shortest pits and isolated shortest pit intervals, so that intersymbol interference is more likely to occur than a random signal. Since the amount of jitter increases, for example, even if the circuit noise of the jitter amount measuring means 41 is large, the jitter due to the radial tilt is less likely to be buried, so that the optimum radial tilt position can be obtained more accurately.

Hereinafter, a sixth embodiment of the present invention will be described with reference to the drawings. FIG. 15 is an explanatory diagram of signals recorded on the learning track 23 of the optical disc medium according to the sixth embodiment of the present invention.

に お い て In FIG. 15, the 11T signal 155 is recorded on the first track 32. On the second track 33, a random signal 156 is recorded. On the third track 34, an 11T signal 157 is recorded.

で は In the case of a rewritable RAM disk, it should be recorded at the time of shipment. In this embodiment, the signal recorded in the data area is a signal obtained by EFM-modulating digital data. However, the effect of the present invention is the same when other modulation methods are used.

At this time, the 3T signal in the EFM modulation corresponds to, for example, a 2T signal in the 1-7 modulation, and the 11T signal in the EFM modulation corresponds to an 8T signal in the 1-7 modulation. That is, the 3T signal in this embodiment may correspond to the minimum inversion interval in another modulation scheme, and the 11T signal may correspond to the maximum inversion interval in another modulation scheme.

ラ ン ダ ム The random signal in FIG. 15 is a signal in which 3T to 11T signals of EFM modulation are distributed. Speaking of these as pits on the optical disk medium, a concave portion having a length corresponding to a 3T signal is changed from a concave portion (nine types) corresponding to an 11T signal, and a convex portion having a length corresponding to a 3T signal is converted into an 11T signal. This is a state in which projections (9 types) of corresponding lengths are combined.

The 11T signals 155 and 157 are signals having only the 11T signal, ie, a pit, and are a continuous pattern of a concave portion having a length corresponding to the 11T signal and a convex portion having a length corresponding to the 11T signal.

In the case of a disk medium or the like having an address in which an address or ECC is added to an 11T signal in a sector as shown in FIG. 36, it is sufficient that a large amount of the 11T signal component is included.

The optical disk medium of this embodiment has the same configuration as that of the optical disk medium of the first embodiment except for the difference in signals recorded on the learning track 23. For example, the radial tilt position learning means described in the first embodiment When mounted on an optical disk device having the learning track, the radial tilt position is changed by a constant amount by the radial tilt position changing means 43 while reproducing the second track 33 of the learning track, and the jitter amount measuring means 41 changes the radial tilt position at that position. Is measured and held in the radial tilt position learning means 42. When the radial tilt position learning means 42 determines the optimum radial tilt position in the inner and outer learning tracks, the measurement is terminated and the optimum radial tilt position in each area is determined.

Since the 11T signal 155 of the first track 32 and the 11T signal 157 of the third track 34 of the learning track 23 of the optical disc medium of the present embodiment have the longest pits and the longest pit intervals, the reproduced signal is larger than the random signal. The amplitude increases, and the amount of crosstalk, which is leakage of signals from the first track 32 and the third track 34 when reproducing the second track 33, increases. Since the jitter amount increases accordingly, the optimum radial tilt position can be obtained with higher accuracy.

Hereinafter, a seventh embodiment of the present invention will be described with reference to the drawings. FIG. 16 is an explanatory diagram of signals recorded on the learning track 23 of the optical disc medium according to the seventh embodiment of the present invention.

に お い て In FIG. 16, the 11T signal 165 is recorded on the first track 32. The worst pattern signal 166 is recorded on the second track 33. On the third track 34, an 11T signal 167 is recorded.

で は In the case of a rewritable RAM disk, it should be recorded at the time of shipment. In this embodiment, the signal recorded in the data area is a signal obtained by EFM-modulating digital data. However, the effect of the present invention is the same when other modulation methods are used.

At this time, the 3T signal in the EFM modulation corresponds to, for example, a 2T signal in the 1-7 modulation, and the 11T signal in the EFM modulation corresponds to an 8T signal in the 1-7 modulation. That is, the 3T signal in this embodiment may correspond to the minimum inversion interval in another modulation scheme, and the 11T signal may correspond to the maximum inversion interval in another modulation scheme.

The worst pattern signal 166 is, for example, a signal having only a 3T signal and an 11T signal as shown in FIG. 32. In the case of a pit, a concave portion having a length corresponding to the 11T signal, a convex portion having a length corresponding to the 3T signal, 11T It is a continuous pattern of a concave portion having a length corresponding to a signal, a convex portion having a length corresponding to an 11T signal, a concave portion having a length corresponding to a 3T signal, and a convex portion having a length corresponding to an 11T signal.

In the case of a disk medium or the like having an address in which an address, ECC, or the like is added to a worst pattern signal in a sector as shown in FIG. 35, it is sufficient that a large number of worst pattern signal components are included.

The 11T signals 165 and 167 are signals having only the 11T signal, ie, a pit, and are a continuous pattern of a concave portion having a length corresponding to the 11T signal and a convex portion having a length corresponding to the 11T signal.

In the case of a disk medium or the like having an address in which an address or ECC is added to an 11T signal in a sector as shown in FIG. 36, it is sufficient that a large amount of the 11T signal component is included.

The optical disk medium of this embodiment has the same configuration as that of the optical disk medium of the first embodiment except for the difference in signals recorded on the learning track 23. For example, the radial tilt position learning means described in the first embodiment When mounted on an optical disk device having the learning track, the radial tilt position is changed by a constant amount by the radial tilt position changing means 43 while reproducing the second track 33 of the learning track, and the jitter amount measuring means 41 changes the radial tilt position at that position. Is measured and held in the radial tilt position learning means 42. When the radial tilt position learning means 42 determines the optimum radial tilt position in the inner and outer learning tracks, the measurement is terminated and the optimum radial tilt position in each area is determined.

The worst pattern signal 166 of the second track 33 of the learning track 23 of the optical disk medium of the present embodiment has more isolated shortest pits and isolated shortest pit intervals, so that intersymbol interference is more likely to occur than a random signal. Since the amount of jitter increases, for example, even if the circuit noise of the jitter amount measuring means 41 is large, the jitter due to the radial tilt is less likely to be buried, so that the optimum radial tilt position can be obtained more accurately.

In addition, since the 11T signal 165 of the first track 32 and the 11T signal 167 of the third track 34 of the learning track 23 of the optical disk medium of the present embodiment have many longest pits and longest pit intervals, they are less than random signals. Also, the amplitude of the reproduction signal increases, and the amount of crosstalk, which is leakage of signals from the first track 32 and the third track 34 when reproducing the second track 33, increases. Since the jitter amount increases accordingly, the optimum radial tilt position can be obtained with higher accuracy.

Hereinafter, an eighth embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows the configuration of an optical disk medium according to an eighth embodiment of the present invention, wherein 1 is an optical disk medium, 2 is a data area, 3 is a learning area on the inner circumference, and 4 is a learning area on the outer circumference. .

FIG. 17 shows the configuration of the learning area of the optical disc medium in the present embodiment. In FIG. 17, 171 is a track, 172 is a pit, and 173 is a learning track. In this embodiment, the learning area is composed of three tracks.

For convenience of explanation, a pit row of one lap continuously reproduced is referred to as a track even when there are no grooves or the like separating adjacent pits in the radial direction of the disc only in the case where pits are arranged in a read-only disc or the like. A virtual boundary 174 is provided. Furthermore, the distance between two adjacent virtual boundaries is referred to as a track width.

In a rewritable RAM disk or the like having a land portion and a groove portion, as shown in FIG. 33, for example, when recording is performed only in the groove portion, the boundary 174 is considered as a land portion, and recording is performed only in the land portion. In this case, the boundary 174 is considered as a groove portion. When recording is performed on both the land portion and the groove portion, a region sandwiched between two adjacent boundaries 174 corresponds to the land portion or the groove portion.

In FIG. 17, the track width of the first track 175 and the third track 177 is equal to the track width of the data area 2, and the track width of the second track 176 is smaller than the track width of the first track 175.

信号 FIG. 18 shows signals recorded on the learning track 173. In FIG. 18, a random signal 181 is recorded on a first track 175. On the second track 176, a random signal 182 is recorded. On the third track 177, a random signal 183 is recorded.

で は In the case of a rewritable RAM disk, it should be recorded at the time of shipment. In this embodiment, the signal recorded in the data area is a signal obtained by EFM-modulating digital data. However, the effect of the present invention is the same when other modulation methods are used.

ラ ン ダ ム The random signal in FIG. 18 is a signal in which the EFM modulated 3T signal to 11T signal are distributed. Speaking of these as pits on the optical disk medium, a concave portion having a length corresponding to a 3T signal is changed from a concave portion (nine types) corresponding to an 11T signal, and a convex portion having a length corresponding to a 3T signal is converted into an 11T signal. This is a state in which projections (9 types) of corresponding lengths are combined.

The optical disk medium of the present embodiment has the same configuration as the optical disk medium of the first embodiment except for the difference in the configuration of the learning track 173, and has, for example, the radial tilt position learning means 42 described in the first embodiment. When mounted on the optical disk device, the radial tilt position changing means 43 changes the radial tilt position by a fixed amount while reproducing the second track 176 of the learning track 173, and the jitter amount measuring means 41 determines the amount of jitter at that position. The measured value is stored in the radial tilt position learning means 42. When the radial tilt position learning means 42 determines the optimum radial tilt position in the inner and outer learning tracks, the measurement is terminated and the optimum radial tilt position in each area is determined.

When the track width of the second track 176 is reduced like the learning track 173 of the optical disk medium of the present embodiment, the signal leaks from the first track 175 and the third track 177 when the second track 176 is reproduced. A certain amount of crosstalk increases. Since the jitter amount increases accordingly, the optimum radial tilt position can be obtained with higher accuracy.

{Circle around (2)} When the track width is reduced as in the present embodiment, learning tracks can be saved and the data area can be increased.

Hereinafter, a ninth embodiment of the present invention will be described with reference to the drawings. FIG. 19 is an explanatory diagram of signals recorded on the learning track 173 of the optical disc medium according to the ninth embodiment of the present invention.

に お い て In FIG. 19, a random signal 191 is recorded on the first track 175. On the second track 176, the worst pattern signal 192 is recorded. On the third track 177, a random signal 193 is recorded.

で は In the case of a rewritable RAM disk, it should be recorded at the time of shipment. In this embodiment, the signal recorded in the data area is a signal obtained by EFM-modulating digital data. However, the effect of the present invention is the same when other modulation methods are used.

At this time, the 3T signal in the EFM modulation corresponds to, for example, a 2T signal in the 1-7 modulation, and the 11T signal in the EFM modulation corresponds to an 8T signal in the 1-7 modulation. That is, the 3T signal in this embodiment may correspond to the minimum inversion interval in another modulation scheme, and the 11T signal may correspond to the maximum inversion interval in another modulation scheme.

ラ ン ダ ム The random signal in FIG. 19 is a signal in which EFM modulated 3T signal to 11T signal are distributed. Speaking of these as pits on the optical disk medium, a concave portion having a length corresponding to a 3T signal is changed from a concave portion (nine types) corresponding to an 11T signal, and a convex portion having a length corresponding to a 3T signal is converted into an 11T signal. This is a state in which projections (9 types) of corresponding lengths are combined.

The worst pattern signal 192 is, for example, a signal having only the 3T signal and the 11T signal as shown in FIG. 32, a pit, a concave portion having a length corresponding to the 11T signal, a convex portion having a length corresponding to the 3T signal, It is a continuous pattern of a concave portion having a length corresponding to the 11T signal, a convex portion having a length corresponding to the 11T signal, a concave portion having a length corresponding to the 3T signal, and a convex portion having a length corresponding to the 11T signal.

In the case of a disk medium or the like having an address in which an address, ECC, or the like is added to a worst pattern signal in a sector as shown in FIG. 35, it is sufficient that a large number of worst pattern signal components are included.

The optical disc medium of this embodiment has the same configuration as that of the optical disc medium of the eighth embodiment except for the difference in signals recorded in the learning track 173. For example, the radial tilt position learning means described in the eighth embodiment When mounted on the optical disc device having the recording track 42, the radial tilt position changing means 43 changes the radial tilt position by a constant amount while reproducing the second track 176 of the learning track 173, and the jitter amount measuring means 41 changes the radial tilt position at that position. Is measured and held in the radial tilt position learning means 42. When the radial tilt position learning means 42 determines the optimum radial tilt position in the inner and outer learning tracks, the measurement is terminated and the optimum radial tilt position in each area is determined.

The worst pattern signal 192 of the second track 176 of the learning track 173 of the optical disc medium of the present embodiment has more isolated shortest pits and isolated shortest pit intervals, so that intersymbol interference is more likely to occur than a random signal. Since the amount of jitter increases, for example, even if the circuit noise of the jitter amount measuring means 41 is large, the jitter due to the radial tilt is less likely to be buried, so that the optimum radial tilt position can be obtained more accurately.

Also, when the track width of the second track 176 is reduced as in the learning track 173 of the optical disc medium of the present embodiment, signal leakage from the first track 175 and the third track 177 when reproducing the second track 176 is performed. The amount of crosstalk, which is a problem, increases. Since the jitter amount increases accordingly, the optimum radial tilt position can be obtained with higher accuracy.

{Circle around (2)} When the track width is reduced as in the present embodiment, learning tracks can be saved and the data area can be increased.

Hereinafter, a tenth embodiment of the present invention will be described with reference to the drawings. FIG. 20 is an explanatory diagram of signals recorded on the learning track 173 of the optical disc medium according to Embodiment 10 of the present invention.

に お い て In FIG. 20, the 11T signal 201 is recorded on the first track 175. On the second track 176, a random signal 202 is recorded. An 11T signal 203 is recorded on the third track 177.

で は In the case of a rewritable RAM disk, it should be recorded at the time of shipment. In this embodiment, the signal recorded in the data area is a signal obtained by EFM-modulating digital data. However, the effect of the present invention is the same when other modulation methods are used.

At this time, the 3T signal in the EFM modulation corresponds to, for example, a 2T signal in the 1-7 modulation, and the 11T signal in the EFM modulation corresponds to an 8T signal in the 1-7 modulation. That is, the 3T signal in this embodiment may correspond to the minimum inversion interval in another modulation scheme, and the 11T signal may correspond to the maximum inversion interval in another modulation scheme.

ラ ン ダ ム The random signal in FIG. 20 is a signal in which 3T to 11T signals of the EFM modulation are distributed. Speaking of these as pits on the optical disk medium, a concave portion having a length corresponding to a 3T signal is changed from a concave portion (nine types) corresponding to an 11T signal, and a convex portion having a length corresponding to a 3T signal is converted into an 11T signal. This is a state in which projections (9 types) of corresponding lengths are combined.

Also, the 11T signals 201 and 203 are signals having only the 11T signal, that is, a pit, a continuous pattern of a concave portion having a length corresponding to the 11T signal and a convex portion having a length corresponding to the 11T signal.

In the case of a disk medium or the like having an address in which an address or ECC is added to an 11T signal in a sector as shown in FIG. 36, it is sufficient that a large amount of the 11T signal component is included.

The optical disc medium of this embodiment has the same configuration as that of the optical disc medium of the eighth embodiment except for the difference in signals recorded in the learning track 173. For example, the radial tilt position learning means described in the eighth embodiment When mounted on the optical disc device having the recording track 42, the radial tilt position changing means 43 changes the radial tilt position by a constant amount while reproducing the second track 176 of the learning track 173, and the jitter amount measuring means 41 changes the radial tilt position at that position. Is measured and held in the radial tilt position learning means 42. When the radial tilt position learning means 42 determines the optimum radial tilt position in the inner and outer learning tracks, the measurement is terminated and the optimum radial tilt position in each area is determined.

Since the 11T signal 201 of the first track 175 and the 11T signal 203 of the third track 177 of the learning track 173 of the optical disk medium of the present embodiment have the longest pits and the longest pit intervals, the reproduced signal is larger than the random signal. The amplitude increases, and the amount of crosstalk, which is leakage of signals from the first track 175 and the third track 177 when reproducing the second track 176, increases. Since the jitter amount increases accordingly, the optimum radial tilt position can be obtained with higher accuracy.

Also, when the track width of the second track 176 is reduced as in the learning track of the optical disc medium of the present embodiment, the signal leaks from the first track 175 and the third track 177 when the second track 176 is reproduced. Is large. Since the jitter amount increases accordingly, the optimum radial tilt position can be obtained with higher accuracy.

{Circle around (2)} When the track width is reduced as in the present embodiment, learning tracks can be saved and the data area can be increased.

Hereinafter, an eleventh embodiment of the present invention will be described with reference to the drawings. FIG. 21 is an explanatory diagram of signals recorded on the learning track 173 of the optical disc medium according to the eleventh embodiment of the present invention.

に お い て In FIG. 21, the 11T signal 211 is recorded on the first track 175. On the second track 176, the worst pattern signal 212 is recorded. An 11T signal 213 is recorded on the third track 177.

で は In the case of a rewritable RAM disk, it should be recorded at the time of shipment. In this embodiment, the signal recorded in the data area is a signal obtained by EFM-modulating digital data. However, the effect of the present invention is the same when other modulation methods are used.

At this time, the 3T signal in the EFM modulation corresponds to, for example, a 2T signal in the 1-7 modulation, and the 11T signal in the EFM modulation corresponds to an 8T signal in the 1-7 modulation. That is, the 3T signal in this embodiment may correspond to the minimum inversion interval in another modulation scheme, and the 11T signal may correspond to the maximum inversion interval in another modulation scheme.

The worst pattern signal 212 is, for example, a signal having only a 3T signal and an 11T signal as shown in FIG. 32. In the case of a pit, a concave portion having a length corresponding to the 11T signal, a convex portion having a length corresponding to the 3T signal, 11T It is a continuous pattern of a concave portion having a length corresponding to a signal, a convex portion having a length corresponding to an 11T signal, a concave portion having a length corresponding to a 3T signal, and a convex portion having a length corresponding to an 11T signal.

In the case of a disk medium or the like having an address in which an address, ECC, or the like is added to a worst pattern signal in a sector as shown in FIG. 35, it is sufficient that a large number of worst pattern signal components are included.

The 11T signals 211 and 213 are signals having only the 11T signal, ie, a pit, and are a continuous pattern of a concave portion having a length corresponding to the 11T signal and a convex portion having a length corresponding to the 11T signal.

In the case of a disk medium or the like having an address in which an address or ECC is added to an 11T signal in a sector as shown in FIG. 36, it is sufficient that a large amount of the 11T signal component is included.

The optical disc medium of this embodiment has the same configuration as that of the optical disc medium of the eighth embodiment except for the difference in signals recorded in the learning track 173. For example, the radial tilt position learning means described in the eighth embodiment When mounted on the optical disc device having the recording track 42, the radial tilt position changing means 43 changes the radial tilt position by a constant amount while reproducing the second track 176 of the learning track 173, and the jitter amount measuring means 41 changes the radial tilt position at that position. Is measured and held in the radial tilt position learning means 42. When the radial tilt position learning means 42 determines the optimum radial tilt position in the inner and outer learning tracks, the measurement is terminated and the optimum radial tilt position in each area is determined.

The worst pattern signal 212 of the second track 176 of the learning track 173 of the optical disc medium of this embodiment has more isolated shortest pits and isolated shortest pit intervals, so that intersymbol interference is more likely to occur than a random signal. Since the amount of jitter increases, for example, even if the circuit noise of the jitter amount measuring means 41 is large, the jitter due to the radial tilt is less likely to be buried, so that the optimum radial tilt position can be obtained more accurately.

In addition, since the 11T signal 211 of the first track 175 and the 11T signal 213 of the third track 177 of the learning track 173 of the optical disc medium of the present embodiment have many longest pits and longest pit intervals, they are larger than random signals. The amplitude of the reproduced signal also increases, and the amount of crosstalk, which is leakage of signals from the first track 175 and the third track 177 when reproducing the second track 176, increases. Since the jitter amount increases accordingly, the optimum radial tilt position can be obtained with higher accuracy.

Also, when the track width of the second track 176 is reduced as in the learning track of the optical disc medium of the present embodiment, the signal leaks from the first track 175 and the third track 177 when the second track 176 is reproduced. Is large. Since the jitter amount increases accordingly, the optimum radial tilt position can be obtained with higher accuracy.

{Circle around (2)} When the track width is reduced as in the present embodiment, learning tracks can be saved and the data area can be increased.

Hereinafter, a twelfth embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows the configuration of an optical disk medium according to a twelfth embodiment of the present invention, wherein 1 is an optical disk medium, 2 is a data area, 3 is a learning area on the inner circumference, and 4 is a learning area on the outer circumference. .

FIG. 22 shows the configuration of the learning area of the optical disc medium in this embodiment. In FIG. 22, 221 is a track, 222 is a pit, and 223 is a learning track. In this embodiment, the learning area is composed of three tracks.

For convenience of explanation, a pit row of one lap continuously reproduced is referred to as a track even when there are no grooves or the like separating adjacent pits in the radial direction of the disc only in the case where pits are arranged in a read-only disc or the like. A virtual boundary 224 is provided. Furthermore, the distance between two adjacent virtual boundaries is referred to as a track width.

In the case of a rewritable RAM disk or the like having a land portion and a groove portion such as a rewritable RAM disk, as shown in FIG. 33, for example, when recording is performed only in the groove portion, the boundary 224 is considered as a land portion and recording is performed only in the land portion In this case, the boundary 224 is considered as a groove portion. Further, when recording is performed on both the land portion and the groove portion, a region sandwiched between two adjacent boundaries 224 corresponds to the land portion or the groove portion.

In FIG. 22, the track width of the second track 226 is equal to the track width of the data area 2, and the track width of the first track 225 and the third track 227 is smaller than the track width of the second track 226.

FIG. 23 shows signals recorded on the learning track 223. In FIG. 23, a random signal 231 is recorded on a first track 225. On the second track 226, a random signal 232 is recorded. On the third track 227, a random signal 233 is recorded.

で は In the case of a rewritable RAM disk, it should be recorded at the time of shipment. In this embodiment, the signal recorded in the data area is a signal obtained by EFM-modulating digital data. However, the effect of the present invention is the same when other modulation methods are used.

ラ ン ダ ム The random signal in FIG. 23 is a signal in which EFM modulated 3T signal to 11T signal are distributed. Speaking of these as pits on the optical disk medium, a concave portion having a length corresponding to a 3T signal is changed from a concave portion (nine types) corresponding to an 11T signal, and a convex portion having a length corresponding to a 3T signal is converted into an 11T signal. This is a state in which projections (9 types) of corresponding lengths are combined.

The optical disc medium of the present embodiment has the same configuration as the optical disc medium of the first embodiment except for the difference in the configuration of the learning track 223. For example, the optical disc medium has the radial tilt position learning means 42 described in the first embodiment. When mounted on the optical disc device, the radial tilt position changing means 43 changes the radial tilt position by a constant amount while reproducing the second track 226 of the learning track 223, and the jitter amount measuring means 41 determines the amount of jitter at that position. The measured value is stored in the radial tilt position learning means 42. When the radial tilt position learning means 42 determines the optimum radial tilt position in the inner and outer learning tracks, the measurement is terminated and the optimum radial tilt position in each area is determined.

When the track widths of the first track 225 and the third track 227 are reduced as in the learning track of the optical disk medium of the present embodiment, signals from the first track 225 and the third track 227 when reproducing the second track 226 are obtained. The amount of crosstalk, which is leakage, increases. Since the jitter amount increases accordingly, the optimum radial tilt position can be obtained with higher accuracy.

{Circle around (2)} When the track width is reduced as in the present embodiment, learning tracks can be saved and the data area can be increased.

Hereinafter, a thirteenth embodiment of the present invention will be described with reference to the drawings. FIG. 24 is an explanatory diagram of signals recorded on the learning track 223 of the optical disc medium according to the thirteenth embodiment of the present invention.

In FIG. 24, a random signal 241 is recorded on the first track 225. On the second track 226, the worst pattern signal 242 is recorded. On the third track 227, a random signal 243 is recorded.

で は In the case of a rewritable RAM disk, it should be recorded at the time of shipment. In this embodiment, the signal recorded in the data area is a signal obtained by EFM-modulating digital data. However, the effect of the present invention is the same when other modulation methods are used.

At this time, the 3T signal in the EFM modulation corresponds to, for example, a 2T signal in the 1-7 modulation, and the 11T signal in the EFM modulation corresponds to an 8T signal in the 1-7 modulation. That is, the 3T signal in this embodiment may correspond to the minimum inversion interval in another modulation scheme, and the 11T signal may correspond to the maximum inversion interval in another modulation scheme.

ラ ン ダ ム The random signal in FIG. 24 is a signal in which the EFM modulated 3T signal to 11T signal are distributed. Speaking of these as pits on the optical disk medium, a concave portion having a length corresponding to a 3T signal is changed from a concave portion (nine types) corresponding to an 11T signal, and a convex portion having a length corresponding to a 3T signal is converted into an 11T signal. This is a state in which projections (9 types) of corresponding lengths are combined.

Further, the worst pattern signal 242 is, for example, a signal having only the 3T signal and the 11T signal as shown in FIG. 32, in terms of a pit, a concave portion having a length corresponding to the 11T signal, a convex portion having a length corresponding to the 3T signal, It is a continuous pattern of a concave portion having a length corresponding to the 11T signal, a convex portion having a length corresponding to the 11T signal, a concave portion having a length corresponding to the 3T signal, and a convex portion having a length corresponding to the 11T signal.

In the case of a disk medium or the like having an address in which an address, ECC, or the like is added to a worst pattern signal in a sector as shown in FIG. 35, it is sufficient that a large number of worst pattern signal components are included.

The optical disc medium of this embodiment has the same configuration as that of the optical disc medium of the twelfth embodiment except for the difference in signals recorded on the learning track 223. For example, the radial tilt position learning means described in the twelfth embodiment is used. When mounted on the optical disc apparatus having the learning track 42, the radial tilt position changing means 43 changes the radial tilt position by a constant amount while reproducing the second track 226 of the learning track 223, and the jitter amount measuring means 41 Is measured and held in the radial tilt position learning means 42. When the radial tilt position learning means 42 determines the optimum radial tilt position in the inner and outer learning tracks, the measurement is terminated and the optimum radial tilt position in each area is determined.

The worst pattern signal 242 of the second track 226 of the learning track 223 of the optical disk medium of the present embodiment has more isolated shortest pits and isolated shortest pit intervals, so that intersymbol interference is more likely to occur than a random signal. Since the amount of jitter increases, for example, even if the circuit noise of the jitter amount measuring means 41 is large, the jitter due to the radial tilt is less likely to be buried, so that the optimum radial tilt position can be obtained more accurately.

Further, when the track widths of the first track 225 and the third track 227 are reduced as in the learning track 223 of the optical disk medium of the present embodiment, the first track 225 and the third track 227 when reproducing the second track 226 are used. The amount of crosstalk, which is leakage of a signal from the device, increases. Since the jitter amount increases accordingly, the optimum radial tilt position can be obtained with higher accuracy.

{Circle around (2)} When the track width is reduced as in the present embodiment, learning tracks can be saved and the data area can be increased.

Hereinafter, a fourteenth embodiment of the present invention will be described with reference to the drawings. FIG. 25 is an explanatory diagram of signals recorded on the learning track 223 of the optical disc medium according to the fourteenth embodiment of the present invention.

In FIG. 25, the 11T signal 251 is recorded on the first track 225. On the second track 226, a random signal 252 is recorded. An 11T signal 253 is recorded on the third track 227.

で は In the case of a rewritable RAM disk, it should be recorded at the time of shipment. In this embodiment, the signal recorded in the data area is a signal obtained by EFM-modulating digital data. However, the effect of the present invention is the same when other modulation methods are used.

At this time, the 3T signal in the EFM modulation corresponds to, for example, a 2T signal in the 1-7 modulation, and the 11T signal in the EFM modulation corresponds to an 8T signal in the 1-7 modulation. That is, the 3T signal in this embodiment may correspond to the minimum inversion interval in another modulation scheme, and the 11T signal may correspond to the maximum inversion interval in another modulation scheme.

ラ ン ダ ム The random signal in FIG. 25 is a signal in which 3T to 11T signals of the EFM modulation are distributed. Speaking of these as pits on the optical disk medium, a concave portion having a length corresponding to a 3T signal is changed from a concave portion (nine types) corresponding to an 11T signal, and a convex portion having a length corresponding to a 3T signal is converted into an 11T signal. This is a state in which projections (9 types) of corresponding lengths are combined.

The 11T signals 251 and 253 are signals having only the 11T signal, ie, a pit, and are a continuous pattern of a concave portion having a length corresponding to the 11T signal and a convex portion having a length corresponding to the 11T signal.

In the case of a disk medium or the like having an address in which an address or ECC is added to an 11T signal in a sector as shown in FIG. 36, it is sufficient that a large amount of the 11T signal component is included.

The optical disc medium of this embodiment has the same configuration as that of the optical disc medium of the twelfth embodiment except for the difference in signals recorded on the learning track 223. For example, the radial tilt position learning means described in the twelfth embodiment is used. When mounted on the optical disc apparatus having the learning track 42, the radial tilt position changing means 43 changes the radial tilt position by a constant amount while reproducing the second track 226 of the learning track 223, and the jitter amount measuring means 41 Is measured and held in the radial tilt position learning means 42. When the radial tilt position learning means 42 determines the optimum radial tilt position in the inner and outer learning tracks, the measurement is terminated and the optimum radial tilt position in each area is determined.

The 11T signal 251 of the first track 225 and the 11T signal 253 of the third track 227 of the learning track 223 of the optical disk medium of the present embodiment have the longest pit and the longest pit interval, so that the reproduction signal is larger than the random signal. The amplitude increases, and the amount of crosstalk, which is leakage of signals from the first track 225 and the third track 227 when reproducing the second track 226, increases. Since the jitter amount increases accordingly, the optimum radial tilt position can be obtained with higher accuracy.

Further, when the track widths of the first track 225 and the third track 227 are reduced as in the learning track of the optical disc medium of the present embodiment, the first track 225 and the third track 227 when reproducing the second track 226 are used. The amount of crosstalk, which is the leakage of the signal, increases. Since the jitter amount increases accordingly, the optimum radial tilt position can be obtained with higher accuracy.

{Circle around (2)} When the track width is reduced as in the present embodiment, learning tracks can be saved and the data area can be increased.

Hereinafter, a fifteenth embodiment of the present invention will be described with reference to the drawings. FIG. 26 is an explanatory diagram of signals recorded on the learning track 223 of the optical disc medium according to the fifteenth embodiment of the present invention.

In FIG. 26, the 11T signal 261 is recorded on the first track 225. On the second track 226, the worst pattern signal 262 is recorded. On the third track 227, an 11T signal 263 is recorded.

で は In the case of a rewritable RAM disk, it should be recorded at the time of shipment. In this embodiment, the signal recorded in the data area is a signal obtained by EFM-modulating digital data. However, the effect of the present invention is the same when other modulation methods are used.

At this time, the 3T signal in the EFM modulation corresponds to, for example, a 2T signal in the 1-7 modulation, and the 11T signal in the EFM modulation corresponds to an 8T signal in the 1-7 modulation. That is, the 3T signal in this embodiment may correspond to the minimum inversion interval in another modulation scheme, and the 11T signal may correspond to the maximum inversion interval in another modulation scheme.

The worst pattern signal 262 is, for example, a signal having only a 3T signal and an 11T signal as shown in FIG. 32. In the case of a pit, a concave portion having a length corresponding to the 11T signal, a convex portion having a length corresponding to the 3T signal, 11T It is a continuous pattern of a concave portion having a length corresponding to a signal, a convex portion having a length corresponding to an 11T signal, a concave portion having a length corresponding to a 3T signal, and a convex portion having a length corresponding to an 11T signal.

In the case of a disk medium or the like having an address in which an address, ECC, or the like is added to a worst pattern signal in a sector as shown in FIG. 35, it is sufficient that a large number of worst pattern signal components are included.

The 11T signals 261 and 263 are signals having only the 11T signal, ie, a pit, and are a continuous pattern of a concave portion having a length corresponding to the 11T signal and a convex portion having a length corresponding to the 11T signal.

In the case of a disk medium or the like having an address in which an address or ECC is added to an 11T signal in a sector as shown in FIG. 36, it is sufficient that a large amount of the 11T signal component is included.

The optical disc medium of this embodiment has the same configuration as that of the optical disc medium of the twelfth embodiment except for the difference in signals recorded on the learning track 223. For example, the radial tilt position learning means described in the twelfth embodiment is used. When mounted on the optical disc apparatus having the learning track 42, the radial tilt position changing means 43 changes the radial tilt position by a constant amount while reproducing the second track 226 of the learning track 223, and the jitter amount measuring means 41 Is measured and held in the radial tilt position learning means 42. When the radial tilt position learning means 42 determines the optimum radial tilt position in the inner and outer learning tracks, the measurement is terminated and the optimum radial tilt position in each area is determined.

The worst pattern signal 262 of the second track 226 of the learning track 223 of the optical disc medium of the present embodiment has more isolated shortest pits and isolated shortest pit intervals, so that intersymbol interference is more likely to occur than a random signal. Since the amount of jitter increases, for example, even if the circuit noise of the jitter amount measuring means 41 is large, the jitter due to the radial tilt is less likely to be buried, so that the optimum radial tilt position can be obtained more accurately.

In addition, since the 11T signal 261 of the first track 225 and the 11T signal 263 of the third track 227 of the learning track 223 of the optical disk medium of the present embodiment have many longest pits and longest pit intervals, they are smaller than random signals. Also, the amplitude of the reproduction signal increases, and the amount of crosstalk, which is leakage of signals from the first track 225 and the third track 227 when reproducing the second track 226, increases. Since the jitter amount increases accordingly, the optimum radial tilt position can be obtained with higher accuracy.

Further, when the track widths of the first track 225 and the third track 227 are reduced as in the learning track of the optical disc medium of the present embodiment, the first track 225 and the third track 227 when reproducing the second track 226 are used. The amount of crosstalk, which is the leakage of the signal, increases. Since the jitter amount increases accordingly, the optimum radial tilt position can be obtained with higher accuracy.

{Circle around (2)} When the track width is reduced as in the present embodiment, learning tracks can be saved and the data area can be increased.

Hereinafter, a sixteenth embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows the configuration of an optical disc medium according to a sixteenth embodiment of the present invention, wherein 1 is an optical disc medium, 2 is a data area, 3 is a learning area on the inner circumference, and 4 is a learning area on the outer circumference. .

FIG. 27 shows the configuration of the learning area of the optical disc medium in this embodiment. In FIG. 27, 271 is a track, 272 is a pit, and 273 is a learning track. In this embodiment, the learning area is composed of three tracks.

For convenience of explanation, a pit row of one lap continuously reproduced is referred to as a track even when there are no grooves or the like separating adjacent pits in the radial direction of the disc only in the case where pits are arranged in a read-only disc or the like. A virtual boundary 274 is provided. Furthermore, the distance between two adjacent virtual boundaries is referred to as a track width.

In the case of a rewritable RAM disk or the like having a land portion and a groove portion such as a rewritable RAM disk, as shown in FIG. 33, for example, when recording is performed only in the groove portion, the boundary 274 is considered as a land portion and recording is performed only in the land portion In this case, the boundary 274 is considered as a groove portion. When recording is performed on both the land portion and the groove portion, a region sandwiched between two adjacent boundaries 274 corresponds to the land portion or the groove portion.

In FIG. 27, the track widths of the three tracks of the learning track 273 are all smaller than the track width of the data area 2.

FIG. 28 shows signals recorded on the learning track 273. In FIG. 28, a random signal 281 is recorded on the first track 275. On the second track 276, a random signal 282 is recorded. On the third track 277, a random signal 283 is recorded.

で は In the case of a rewritable RAM disk, it should be recorded at the time of shipment. In this embodiment, the signal recorded in the data area is a signal obtained by EFM-modulating digital data. However, the effect of the present invention is the same when other modulation methods are used.

ラ ン ダ ム The random signal in FIG. 28 is a signal in which 3T to 11T signals of EFM modulation are distributed. Speaking of these as pits on the optical disk medium, a concave portion having a length corresponding to a 3T signal is changed from a concave portion (nine types) corresponding to an 11T signal, and a convex portion having a length corresponding to a 3T signal is converted into an 11T signal. This is a state in which projections (9 types) of corresponding lengths are combined.

The optical disc medium of the present embodiment has the same configuration as that of the optical disc medium of the first embodiment except for the difference in the configuration of the learning track 273, and has, for example, the radial tilt position learning means 42 described in the first embodiment. When mounted on the optical disc device, the radial tilt position changing means 43 changes the radial tilt position by a fixed amount while reproducing the second track 276 of the learning track 273, and the jitter amount at that position is changed by the jitter amount measuring means 41. The measured value is stored in the radial tilt position learning means 42. When the radial tilt position learning means 42 determines the optimum radial tilt position in the inner and outer learning tracks, the measurement is terminated and the optimum radial tilt position in each area is determined.

When the track width of the learning track is narrowed like the learning track 273 of the optical disk medium of the present embodiment, when the second track 276 is reproduced, a cross which is a signal leakage from the first track 275 and the third track 277 is generated. The talk amount increases. Since the jitter amount increases accordingly, the optimum radial tilt position can be obtained with higher accuracy.

{Circle around (2)} When the track width is reduced as in the present embodiment, learning tracks can be saved and the data area can be increased.

Hereinafter, a seventeenth embodiment of the present invention will be described with reference to the drawings. FIG. 29 is an explanatory diagram of signals recorded on the learning track 273 of the optical disc medium according to the seventeenth embodiment of the present invention.

に お い て In FIG. 29, a random signal 291 is recorded on the first track 275. On the second track 276, the worst pattern signal 292 is recorded. On the third track 277, a random signal 293 is recorded.

で は In the case of a rewritable RAM disk, it should be recorded at the time of shipment. In this embodiment, the signal recorded in the data area is a signal obtained by EFM-modulating digital data. However, the effect of the present invention is the same when other modulation methods are used.

At this time, the 3T signal in the EFM modulation corresponds to, for example, a 2T signal in the 1-7 modulation, and the 11T signal in the EFM modulation corresponds to an 8T signal in the 1-7 modulation. That is, the 3T signal in this embodiment may correspond to the minimum inversion interval in another modulation scheme, and the 11T signal may correspond to the maximum inversion interval in another modulation scheme.

ラ ン ダ ム The random signal in FIG. 29 is a signal in which 3T to 11T signals of the EFM modulation are distributed. Speaking of these as pits on the optical disk medium, a concave portion having a length corresponding to a 3T signal is changed from a concave portion (nine types) corresponding to an 11T signal, and a convex portion having a length corresponding to a 3T signal is converted into an 11T signal. This is a state in which projections (9 types) of corresponding lengths are combined.

The worst pattern signal 292 is, for example, a signal having only a 3T signal and an 11T signal as shown in FIG. 32, a pit, a concave portion having a length corresponding to the 11T signal, a convex portion having a length corresponding to the 3T signal, It is a continuous pattern of a concave portion having a length corresponding to the 11T signal, a convex portion having a length corresponding to the 11T signal, a concave portion having a length corresponding to the 3T signal, and a convex portion having a length corresponding to the 11T signal.

In the case of a disk medium or the like having an address in which an address, ECC, or the like is added to a worst pattern signal in a sector as shown in FIG. 35, it is sufficient that a large number of worst pattern signal components are included.

The optical disc medium of this embodiment has the same configuration as that of the optical disc medium of the sixteenth embodiment except for the difference in signals recorded on the learning track 273. For example, the radial tilt position learning means described in the sixteenth embodiment is used. When mounted on the optical disk device having the learning track 273, the radial tilt position changing means 43 changes the radial tilt position by a fixed amount while reproducing the second track 276 of the learning track 273, and the jitter amount measuring means 41 Is measured and held in the radial tilt position learning means 42. When the radial tilt position learning means 42 determines the optimum radial tilt position in the inner and outer learning tracks, the measurement is terminated and the optimum radial tilt position in each area is determined.

The worst pattern signal 292 of the second track 276 of the learning track 273 of the optical disk medium of the present embodiment has more isolated shortest pits and isolated shortest pit intervals, so that intersymbol interference is more likely to occur than a random signal. Since the amount of jitter increases, for example, even if the circuit noise of the jitter amount measuring means 41 is large, the jitter due to the radial tilt is less likely to be buried, so that the optimum radial tilt position can be obtained more accurately.

Further, when the track width of the learning track is narrowed like the learning track 273 of the optical disk medium of the present embodiment, the signal leaks from the first track 275 and the third track 277 when the second track 276 is reproduced. A certain amount of crosstalk increases. Since the jitter amount increases accordingly, the optimum radial tilt position can be obtained with higher accuracy.

{Circle around (2)} When the track width is reduced as in the present embodiment, learning tracks can be saved and the data area can be increased.

Hereinafter, an eighteenth embodiment of the present invention will be described with reference to the drawings. FIG. 30 is an explanatory diagram of signals recorded on the learning track 273 of the optical disc medium according to the eighteenth embodiment of the present invention.

に お い て In FIG. 30, the 11T signal 301 is recorded on the first track 275. On the second track 276, a random signal 302 is recorded. An 11T signal 303 is recorded on the third track 277.

で は In the case of a rewritable RAM disk, it should be recorded at the time of shipment. In this embodiment, the signal recorded in the data area is a signal obtained by EFM-modulating digital data. However, the effect of the present invention is the same when other modulation methods are used.

At this time, the 3T signal in the EFM modulation corresponds to, for example, a 2T signal in the 1-7 modulation, and the 11T signal in the EFM modulation corresponds to an 8T signal in the 1-7 modulation. That is, the 3T signal in this embodiment may correspond to the minimum inversion interval in another modulation scheme, and the 11T signal may correspond to the maximum inversion interval in another modulation scheme.

ラ ン ダ ム The random signal in FIG. 30 is a signal in which EFM modulated 3T signal to 11T signal are distributed. Speaking of these as pits on the optical disk medium, a concave portion having a length corresponding to a 3T signal is changed from a concave portion (nine types) corresponding to an 11T signal, and a convex portion having a length corresponding to a 3T signal is converted into an 11T signal. This is a state in which projections (9 types) of corresponding lengths are combined.

Also, the 11T signals 301 and 303 are signals having only the 11T signal, ie, a pit, and are a continuous pattern of a concave portion having a length corresponding to the 11T signal and a convex portion having a length corresponding to the 11T signal.

In the case of a disk medium or the like having an address in which an address or ECC is added to an 11T signal in a sector as shown in FIG. 36, it is sufficient that a large amount of the 11T signal component is included.

The optical disc medium of this embodiment has the same configuration as that of the optical disc medium of the sixteenth embodiment except for the difference in signals recorded on the learning track 273. For example, the radial tilt position learning means described in the sixteenth embodiment is used. When mounted on the optical disk device having the learning track 273, the radial tilt position changing means 43 changes the radial tilt position by a fixed amount while reproducing the second track 276 of the learning track 273, and the jitter amount measuring means 41 Is measured and held in the radial tilt position learning means 42. When the radial tilt position learning means 42 determines the optimum radial tilt position in the inner and outer learning tracks, the measurement is terminated and the optimum radial tilt position in each area is determined.

Since the 11T signal 301 of the first track 275 and the 11T signal 303 of the third track 277 of the learning track 273 of the optical disk medium of this embodiment have the longest pits and the longest pit intervals, the reproduction signal is larger than the random signal. The amplitude increases, and the amount of crosstalk, which is leakage of signals from the first track 275 and the third track 277 when reproducing the second track 276, increases. Since the jitter amount increases accordingly, the optimum radial tilt position can be obtained with higher accuracy.

Further, when the track width of the learning track is narrowed like the learning track 273 of the optical disk medium of the present embodiment, the signal leaks from the first track 275 and the third track 277 when the second track 276 is reproduced. A certain amount of crosstalk increases. Since the jitter amount increases accordingly, the optimum radial tilt position can be obtained with higher accuracy.

{Circle around (2)} When the track width is reduced as in the present embodiment, learning tracks can be saved and the data area can be increased.

Hereinafter, a nineteenth embodiment of the present invention will be described with reference to the drawings. FIG. 31 is an explanatory diagram of signals recorded on the learning track 273 of the optical disc medium according to the nineteenth embodiment of the present invention.

に お い て In FIG. 31, the 11T signal 311 is recorded on the first track 275. On the second track 276, the worst pattern signal 312 is recorded. An 11T signal 313 is recorded on the third track 277.

で は In the case of a rewritable RAM disk, it should be recorded at the time of shipment. In this embodiment, the signal recorded in the data area is a signal obtained by EFM-modulating digital data. However, the effect of the present invention is the same when other modulation methods are used.

At this time, the 3T signal in the EFM modulation corresponds to, for example, a 2T signal in the 1-7 modulation, and the 11T signal in the EFM modulation corresponds to an 8T signal in the 1-7 modulation. That is, the 3T signal in this embodiment may correspond to the minimum inversion interval in another modulation scheme, and the 11T signal may correspond to the maximum inversion interval in another modulation scheme.

The worst pattern signal 312 is, for example, a signal having only the 3T signal and the 11T signal as shown in FIG. 32. In the case of a pit, a concave portion having a length corresponding to the 11T signal, a convex portion having a length corresponding to the 3T signal, 11T It is a continuous pattern of a concave portion having a length corresponding to a signal, a convex portion having a length corresponding to an 11T signal, a concave portion having a length corresponding to a 3T signal, and a convex portion having a length corresponding to an 11T signal.

In the case of a disk medium or the like having an address in which an address, ECC, or the like is added to a worst pattern signal in a sector as shown in FIG. 35, it is sufficient that a large number of worst pattern signal components are included.

The 11T signals 311 and 313 are signals having only the 11T signal, ie, a pit, and are a continuous pattern of a concave portion having a length corresponding to the 11T signal and a convex portion having a length corresponding to the 11T signal.

In the case of a disk medium or the like having an address in which an address or ECC is added to an 11T signal in a sector as shown in FIG. 36, it is sufficient that a large amount of the 11T signal component is included.

The optical disc medium of this embodiment has the same configuration as that of the optical disc medium of the sixteenth embodiment except for the difference in signals recorded on the learning track 273. For example, the radial tilt position learning means described in the sixteenth embodiment is used. When mounted on the optical disk device having the learning track 273, the radial tilt position changing means 43 changes the radial tilt position by a fixed amount while reproducing the second track 276 of the learning track 273, and the jitter amount measuring means 41 Is measured and held in the radial tilt position learning means 42. When the radial tilt position learning means 42 determines the optimum radial tilt position in the inner and outer learning tracks, the measurement is terminated and the optimum radial tilt position in each area is determined.

The worst pattern signal 312 of the second track 276 of the learning track 273 of the optical disk medium of the present embodiment has more isolated shortest pits and isolated shortest pit intervals, so that intersymbol interference is more likely to occur than a random signal. Since the amount of jitter increases, for example, even if the circuit noise of the jitter amount measuring means 41 is large, the jitter due to the radial tilt is less likely to be buried, so that the optimum radial tilt position can be obtained more accurately.

In addition, since the 11T signal 311 of the first track 275 and the 11T signal 313 of the third track 277 of the learning track 273 of the optical disc medium of the present embodiment have many longest pits and longest pit intervals, they are larger than random signals. Also, the amplitude of the reproduction signal increases, and the amount of crosstalk, which is leakage of signals from the first track 275 and the third track 277 when reproducing the second track 276, increases. Since the jitter amount increases accordingly, the optimum radial tilt position can be obtained with higher accuracy.

Further, when the track width of the learning track is narrowed like the learning track 273 of the optical disk medium of the present embodiment, the signal leaks from the first track 275 and the third track 277 when the second track 276 is reproduced. A certain amount of crosstalk increases. Since the jitter amount increases accordingly, the optimum radial tilt position can be obtained with higher accuracy.

{Circle around (2)} When the track width is reduced as in the present embodiment, learning tracks can be saved and the data area can be increased.

The optical disk device of the present invention is excellent in realizing an automatic adjustment function for compensating for a change in the reproduction characteristics of the disk caused by the optical disk medium, the optical disk device, and a combination of both.

Configuration diagram of an optical disc medium according to a first embodiment of the present invention Configuration diagram of the learning track of the optical disc medium in the embodiment Explanatory drawing of the signal recorded on the learning track in the embodiment Block diagram of the optical disc device in the embodiment Block diagram of jitter amount measuring means and PLL in the embodiment Configuration diagram of radial tilt position changing means in the embodiment FIG. 4 is a block diagram of an optical disc device according to a second embodiment of the present invention. Configuration diagram of tangential tilt position changing means in the embodiment Block diagram of an optical disc device according to a third embodiment of the present invention Block diagram of an optical disc device according to a fourth embodiment of the present invention Configuration diagram of conventional optical disk medium Block diagram of a conventional optical disk device Block diagram of conventional PLL Explanatory drawing of a signal recorded on a learning track in the fifth embodiment of the present invention Explanatory drawing of a signal recorded on a learning track in a sixth embodiment of the present invention Explanatory drawing of the signal recorded on the learning track in the seventh embodiment of the present invention Configuration diagram of the learning track of the optical disk medium in the eighth embodiment of the present invention Explanatory drawing of the signal recorded on the learning track in the embodiment Explanatory drawing of a signal recorded on a learning track in the ninth embodiment of the present invention Explanatory diagram of signals recorded on learning tracks according to Embodiment 10 of the present invention. Explanatory drawing of a signal recorded on a learning track in the eleventh embodiment of the present invention Configuration diagram of a learning track of an optical disc medium according to a twelfth embodiment of the present invention Explanatory drawing of the signal recorded on the learning track in the embodiment Explanatory drawing of a signal recorded on a learning track in a thirteenth embodiment of the present invention. Explanatory drawing of a signal recorded on a learning track in the fourteenth embodiment of the present invention Explanatory drawing of a signal recorded on a learning track in the fifteenth embodiment of the present invention Configuration diagram of the learning track of the optical disc medium in the sixteenth embodiment of the present invention Explanatory drawing of the signal recorded on the learning track in the embodiment Explanatory drawing of a signal recorded on a learning track in the seventeenth embodiment of the present invention Explanatory drawing of a signal recorded on a learning track in the eighteenth embodiment of the present invention Explanatory drawing of a signal recorded on a learning track in the nineteenth embodiment of the present invention Explanatory drawing of the worst pattern signal in the fifth embodiment of the present invention Schematic diagram of the cross section of a rewritable optical disk medium Flowchart of learning in the first embodiment of the present invention Sector configuration diagram Sector configuration diagram

Explanation of reference numerals

Reference Signs List 1 optical disk medium 2 data area 3 learning area 4 learning area 23 learning track 32 first track 33 second track 34 third track 41 jitter amount measuring means 42 radial tilt position learning means 43 radial tilt position variable means 51 high-pass filter 52 A / D converter 71 Tangential tilt position learning means 72 Tangential tilt position variable means 91 Focus position learning means 92 Focus position variable means 93 Focus servo circuit 101 Off-track position learning means 102 Off-track position variable means 103 Tracking servo circuit 123 Semiconductor laser LD
124-pin photodiode PD
129 PLL
131 phase comparator

Claims (5)

Jitter amount measuring means for detecting the jitter amount from the reproduced signal, radial tilt position changing means for changing the radial tilt position of the optical head, and determining the radial tilt position at which the jitter amount becomes minimum from the output signal of the jitter amount measuring means. An optical disc device, comprising: a radial tilt position learning unit that performs the operation. Jitter amount measuring means for detecting the jitter amount from the reproduced signal, tangential tilt position varying means for changing the tangential tilt position of the optical head, and tangential tilt for minimizing the jitter amount from the output signal of the jitter amount measuring means An optical disc device comprising a tangential tilt position learning means for determining a position. A jitter amount measuring means for detecting a jitter amount from a reproduced signal; a focus position varying means for changing a focus position of the optical head; and a focus position for judging a focus position at which the jitter amount is minimum from an output signal of the jitter amount measuring means. An optical disc device having learning means. Jitter amount measuring means for detecting the amount of jitter from the reproduced signal, off-track position varying means for changing the off-track position of the optical head, and determining the off-track position at which the amount of jitter is minimized from the output signal of the jitter amount measuring means An optical disc device comprising an off-track position learning means for performing the operation. The jitter amount measuring means includes a high-pass filter for extracting a high-frequency component of the signal, a detector for detecting an output signal of the high-pass filter, and an A / D converter for digitizing the output signal of the detector. The optical disk device according to claim 1, 2, 3, or 4.

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