JP2002197677A - Optical disk with illicit copying preventive function and optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To identify whether an illicitly copied disk or not by utilizing the presence or absence of a prepit section not existing on a central line of a track or the presence or absence of the oscillation of the track. SOLUTION: Displaced bit strings 7 formed by displacing portions of the bit strings of the track 5 in a radial direction are arranged in the region of a portion of the disk 1. When a light spot 8 passes the displaced bit strings 7, the fluctuation in the width of a regenerative signal is little but a large level fluctuation occurs in a tracking error signal. The presence or absence of the displaced bit strings 7 is detected by utilizing the level fluctuation of the tracking error signal, by which the disk is discriminated. The region of a portion of the disk 51 is provided with the track 54 oscillated by the frequency higher than the frequency at the intercession point of the control gains of tracking control and the disk is discriminated by the level of the oscillation frequency component included in the tracking error signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recordable / reproducible optical disk having an information pit array having a shape peculiar to the disk, and whether or not the disk is illegally copied using information specific to the optical disk. The present invention relates to an optical disk device that can determine the optical disk.

[0002]

2. Description of the Related Art Optical discs such as compact discs have been used as information transmission means in various fields such as application software for personal computers, databases, and music in recent years.

In particular, since a read-only optical disk can be manufactured by transferring information pits from a single master stamper to a plastic plate by injection molding, an optical disk having the same contents can be mass-produced in a short time and at low cost. There are features.

A tracking control method for reading information from an optical disk will be described with reference to the drawings. FIG. 25 is a block diagram of a conventional tracking control.

[0005] 200 is a disk, 201 is a track,
202 is a light spot, 210 is a disk motor for rotating the disk 200. An optical head 211 optically reproduces a signal on the disk 200. The optical head 212 includes a semiconductor laser 212, a collimating lens 213, an objective lens 214, a half mirror 215, a light receiving unit 216, and an actuator 217. 220 is the light spot 20
A tracking error signal detection unit that detects a tracking error signal indicating the amount of positional deviation between the track 2 and the track 201 in the radial direction is configured by 221 differential circuits and 222 low-pass filters. 223, a phase compensator for generating a drive signal for driving the optical head from the tracking error signal;
Reference numeral 24 denotes a head drive unit that drives the actuator 217 in the optical head 211 based on a drive signal. 225 is an addition circuit for the signal from the light receiving unit 216, 226 is a binarization circuit unit for binarizing the reproduction signal, and 227 is a signal processing unit for demodulating the reproduction signal and converting it to information data.

First, position control of the light spot in the focal direction (focus direction) is performed. In the present invention, it is generally assumed that focus control is realized.

The operation for performing tracking control will be described below. The laser light emitted from the semiconductor laser 212 is collimated by the collimator lens 213 and converged on the disk 200 via the objective lens 214.
The laser light reflected by the disk 200 is reflected by the half mirror 2
The light quantity distribution determined by the relative position between the light spot 202 on the disk and the track 201 is detected as an electric signal by returning to the light receiving units 216a and 216b via the optical disc unit 15. 2
When the divided light receiving units 216a and 216b are used, the difference between the light receiving units 216a and 216b is detected by the differential circuit 221 and the low band of the differential signal is extracted by the low-pass filter 222 so that the tracking error signal is generated. Is detected. In order for the light spot 202 to follow the track 201, a driving signal is generated by the phase compensating unit 223 so that the tracking error signal becomes 0 (the light amount distribution of the light receiving units 116a and 116b is equal), and according to the driving signal. Head drive unit 22
4, the actuator 217 is moved, and the objective lens 214 is moved.
Control the position of.

On the other hand, the light spot 202 is
In the pit portion of the track, the amount of reflected light decreases due to light interference in the pit portion of the track, and the output of the light receiving portion decreases. In the portion without a pit, the amount of reflected light increases, so that the output of the light receiving portion increases. The total amount of light output from the light receiving section corresponding to the pit is obtained by an adder circuit 225, and the reproduced signal is converted into a binary signal by the binarizing circuit section
In step 6, a binary signal and a read clock are generated. This 2
Signal processing unit 22 for demodulating and error correcting the coded signal
7, it can be used as information.

[0009] The information read from the optical disk is transferred to a personal computer or the like and used in the personal computer. A part or all of the information can be recorded and stored in another recording medium as needed. Generally, since the copyright of the application software for personal computers is protected by law, it cannot be copied without the consent of the right holder. However, since there is a case where the information is illegally copied, a copy prevention method of recording and managing the copy management information on the medium for the information distributed on the recordable medium may be adopted.

[0010]

However, a read-only optical disk can only reproduce recorded information, so that copy management information cannot be stored on the disk itself. Therefore, the contents of the read-only optical disk may be copied to another inexpensive recordable medium without permission and used, which poses a problem in terms of copyright protection.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention prevents the reuse of information on a copy disk by adding identification information as a track shape to an original disk that is regularly distributed under the control of the right holder. It is intended to be.

[0012]

In order to solve the above-mentioned problems, an unauthorized copy preventing optical disk according to the present invention has a displacement in which a part of a track composed of a sequence of information pits is displaced in a radial direction from a track center line. The pit array is provided in a part of the radius area of the optical disc.

Further, in the disk having the displacement pit train, information on the position where the displacement pit train exists and displacement pattern information of the displacement pit train are recorded in the information pit train.

The present invention has an oscillating track area formed by oscillating a track composed of a sequence of information pits at a predetermined frequency and a predetermined amplitude. The information is recorded in the information pit row.

Further, the optical disk apparatus with an unauthorized copy preventing function according to the present invention is an optical disk having the above-mentioned displacement pit row, a displacement pit row detecting section for detecting the presence of the above-mentioned displacement pit row from a level change of a tracking error signal, and An arrangement position information detection unit that reads and stores the arrangement position information and the displacement pattern information of the displacement pit row, a displacement pit row information management unit, and the presence or absence of a displacement pit row based on the output from the displacement pit row detection unit and the displacement pattern match detection unit. And a disc determining unit for identifying that the displacement patterns match.

Also, an optical disk having the oscillating track, an oscillating track detector for extracting an oscillating component from a tracking error signal, and an arrangement for reading and storing information on the arrangement position and the oscillating frequency where the oscillating track exists. It is characterized by comprising a position information detecting section, a swing frequency information detecting section, and a disk determining section for identifying a disk from an output of the swing track detecting section.

According to the present invention, by using the above-described configuration, a unique track shape is formed as an identification signal for each optical disc, thereby discriminating whether or not the disc to be reproduced is an original disc, and using data by an illegally copied disc. Can be restricted.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an optical disc with an unauthorized copy preventing function according to a first embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic diagram of an optical disk with an unauthorized copy preventing function according to a first embodiment of the present invention. FIG. 1 (a)
In the figure, 1 is a disc, 2 is a lead-in area of the disc, and 3 is a disc identification area having a displacement pit train. FIG. 1B is an enlarged view of the disc identification area, 4 is a pit, 5 is a track formed as a pit row, 6 is a center pit row having pits formed at the track center, and 7 is a displacement pit row. , 8 are light spots.

The operation will be described with reference to FIG. Track 5
Are formed as a series of pit rows according to a predetermined modulation rule by cutting (exposure) using a laser in a master stamper manufacturing process for manufacturing a disk. During the cutting of the track 5, the laser beam for cutting is temporarily displaced in the track radial direction at a predetermined position, thereby forming the displacement pit row 7. The amount of displacement of the displacement pit train 7 in the track radial direction is within a range that does not greatly affect the reproduction signal of the information represented by the pits, and the displacement of the pit train can be detected as a level change of the tracking error signal. give.

Generally, an amplitude change .DELTA.RF of the reproduced signal RF with respect to a positional deviation .DELTA.x between the pit 4 and the light spot 8 is as shown in FIG. Tracking error signal T for deviation amount Δx
The amplitude change ΔTE of E is as shown in FIG. That is, since the amplitude change ΔRF of the reproduction signal with respect to the positional deviation amount Δx is smaller than the amplitude change ΔTE of the tracking error signal, if the position deviation amount (pit displacement amount) is in an appropriate state, the amplitude change of the reproduction signal is The level fluctuation of the tracking error signal can be reliably detected within a range that does not affect the reproduction of the information.

Considering that the accuracy required for the tracking control is usually about 1/15 of the track pitch TP, the amount of displacement at which the level fluctuation can be detected is approximately 1/15 to 1/8 of the track pitch. The amount may be set.

Also, the tracking error signal is usually LPF
(Low Pass Filter), the length of the displacement pit row in the track line direction is determined by the LP of the tracking error signal.
The length must be within the F signal band (about 50 kHz or less). Therefore, the length of the displacement pit row 7 in the track line direction may be set to be several tens μsec or more as the transit time of the light spot 8.

The reproduced signal R in the displacement pit row 7 described above
FIG. 3 shows the waveforms of F and the tracking error signal TE. When the light spot 8 is located at the center pit row 9, the tracking error signal TE shows a value near 0 because the light spot 8 is substantially at the center of the track 5 by the tracking control.
The reproduction signal RF is a signal corresponding to the presence or absence of the pit 4.

Next, when the light spot 8 hits the displacement pit row 7 having the displacement amount Δx, the light spot 8 cannot follow the pit row which has been displaced sharply, so that the light spot 8 and the pit 4 are misaligned. Δx occurs, and the level of the tracking error signal TE changes suddenly by ΔTE. The reproduction signal RF also changes by ΔRF but does not affect reproduction.

When the passing time of the displacement pit row 7 is about several tens μsec, the light spot 8 returns to the normal center pit row 10 before following the displacement pit row 7, so that tracking is performed as shown in FIG. The error signal returns to near zero again. Accordingly, the tracking error signal TE before and after the displacement pit row portion 7 has a waveform as shown in FIG.

Therefore, if the displacement pit train is provided on the original disc, the level of the tracking error signal fluctuates in the displacement pit train as described above. On the other hand, when the information in the original disc is copied to another recording medium, it is possible to copy the information obtained from the reproduced signal, but the displacement pit row is not copied. Or a copy disk.

The disc identification area 3 in which the displacement pit row is arranged is used together with a disc management data area (for example, a TOC area of a CD) which is always reproduced at the start of the disc reproducing operation, so that it can be always checked at the time of starting the disc. It is efficient to set

Next, a second embodiment will be described. FIG.
Is a schematic diagram of a displacement pit row in the second embodiment, showing a case where the displacement directions of the displacement pit row are combined in a prescribed pattern. In FIG. 4, 4 is a pit, 5 is a track, 8 is a light spot, 11, 12, and 13 are central pit rows composed of pits at the center of the track, and 14, 15
Is a displacement pit row, and 16 is an identification pit section composed of a plurality of displacement pit rows. Here, two displacement pit rows 1
4 and 15 are respectively arranged on the outer circumference side and the inner circumference side of the disk.

The displacement amount and length of each of the displacement pit rows 14 and 15 and the arrangement area of the displacement pit rows are the same as in the first embodiment. As shown in FIG. 4, the light spot 8 has the displacement pit row ID 114 on the outer circumference side first, and then the displacement pit row ID 21 on the inner circumference side.
5, the level of the tracking error signal fluctuates in the displacement pit train as described in the first embodiment. However, since the direction of the level fluctuation varies depending on the direction of the pit displacement, as shown in FIG. The tracking error signal TE fluctuates to the positive side and the negative side at the position of the displacement pit row.

Therefore, it is possible to identify the pattern of the displacement pit row depending on the state of the level change of the tracking error signal. By forming a pattern using a plurality of displacement pit arrays, it is possible to reliably separate the level variation of the tracking error signal caused by the scratches, dirt, etc. of the disk from the level variation of the tracking error signal caused by the displacement pit array. . One set of identification pit portions 16 configured by combining such a plurality of displacement pit strings is
An arbitrary pattern can be formed by arbitrarily combining the displacement direction and the number of each displacement pit row. For example, when two displacement pit rows ID1 and ID2 are used as a set, a combination of displacement directions (ID1, ID2)
Are (inner, inner), (inner, outer), (outer, inner),
Four displacement patterns (outer circumference, outer circumference) can be selected. In addition,
The length of the center pit row 12 between the displacement pit rows 14 and 15 may be shorter than the displacement pit rows 14 and 15, or may be omitted.

Next, a third embodiment will be described. FIG. 5 shows the arrangement information of the displacement pit row in the third embodiment. 31 is a disk, 32 is a lead-in area of the disk, 33 is a management data area in which disk management data is recorded, and 34 is a displacement pit arrangement track in which displacement pits are arranged. 35 is disk management data, 36
Is disk management data such as the contents of the disk, 37 is displacement pit information, 38 is displacement position information of a displacement pit train, 39
Is the displacement pattern information of the displacement pit train. Also, 40
Is a track, and 41 is a displacement pit row or identification pit row.

In this example, a case where the arrangement position information and the displacement pattern information are recorded as the displacement pit information will be described. However, when only the arrangement position information or only the displacement pattern information is recorded, the arrangement position information is recorded. If only the information on the position or the displacement pattern is valid, it can be realized without losing generality. In particular, when the arrangement position or the displacement pattern is determined as a disc standard, information that is not specified in the standard may be recorded on the disc. It is preferable that the displacement pit information is recorded in a part of the data in the management data area for recording the contents of the disc and the like. Therefore, the displacement pit string information is recorded in the management data area 33 of the disc. However, there is no problem even if the displacement pit string information is arranged outside the management data area.

First, in a normal management data area, blocks of management data having the same contents are repeatedly recorded,
The management data can be read no matter where the optical head is located in the management data area. In the management data 35, displacement pit information 37 is recorded in addition to the disk management data indicating the contents and position of the disk. Further, the displacement pit information 37 includes the arrangement position information 3 indicating the track position (or address number) where the displacement pit row is arranged.
8 and the displacement pattern information 39 (displacement pattern, number, etc.) of the displacement pit row when constituting the identification pit portion.

The track 40 indicated by the arrangement position information is provided with an identification pit portion 41 composed of a combination of the displacement pit train or the displacement pit train indicated by the displacement pattern information 39.

In the displacement pit arrangement track 34 indicated by the arrangement position information of the displacement pit information, displacement pit trains (identification pit portions) 41 are arranged at a plurality of positions as shown in FIG. This is because the displacement pit train (identification pit portion) 41 may be one set, but the portion may become unreadable due to a disk defect or the like. This is because it is better to arrange them.

It should be noted that the displacement pit arrangement track 34 may be one track, or there is no operational problem over a range of several tracks.

According to the second embodiment, it is not necessary to record a displacement pit row in a wide area as compared with the first embodiment.
In addition, since the disc creator can specify an arbitrary displacement pattern at an arbitrary position, it is possible to provide encryption for disc identification.

Next, a fourth embodiment will be described. FIG. 6 is a configuration diagram of a disk with an unauthorized copy protection function according to the fourth embodiment. FIG. 6A is an overall view of the disk, 51 is a disk, 52 is a lead-in area of the disk, and 53 is a disk identification area composed of pit trains formed by swinging at a prescribed frequency. FIG. 6B is an enlarged view of the disc identification area 53, where 4 is a pit, 8 is a light spot,
Numeral 54 denotes a swinging track composed of a series of pits.

When the swing frequency fwb of the swing track 54 shown in FIG. 6B is set to a frequency higher than the tracking control band (gain crossing point), the light spot 8 cannot follow the swing of the swing track 54. Therefore, the swing amplitude A becomes the amount of displacement. Therefore, the tracking error signal
The fluctuation signal of the oscillation frequency is superposed.

In order to detect the fluctuation component as a level change of the tracking error signal, the fluctuation component is set to be equal to or less than the band of the LPF of the tracking error signal detection unit, and is approximately 1 kHz to 20 kHz.
May be set in the range. Further, the swing amplitude A is set to an appropriate value of about 1/15 to 1/8 of the track pitch TP as described in the first embodiment, as an amplitude that does not affect the reproduction signal.

FIG. 7 shows the state of the reproduction signal RF and the tracking error signal TE at this time. The light spot 8 follows around the amplitude center of the swing track 54 and cannot follow the swing of the swing track 54. Therefore, a signal level corresponding to the swing amplitude A is generated at the swing frequency fwb in the tracking error signal TE. Further, the amplitude of the reproduced signal RF also varies, but the level does not affect reproduction.

By detecting the signal level of the specific frequency fwb of the tracking error signal generated by the oscillating track 54, it is possible to discriminate between an original disk and a copied disk.

As in the first embodiment, the swing track is used together with a management data area (for example, a TOC area of a CD) of the disk which is always reproduced at the start of the disk reproduction operation, so that it can be always checked at the time of starting the disk. It is efficient to set

Next, a fifth embodiment will be described. FIG. 8 shows the arrangement information of the swing track in the fifth embodiment. 61 is a disk, 62 is a lead-in area of the disk, 63 is a management data area in which disk management data is recorded, and 64 is a track on which swing tracks are arranged. 65 is disk management data, 66 is disk management data such as the contents of the disk, 67 is swing track information, 68 is swing track arrangement position information, and 69 is swing track frequency information.

In this example, a description will be given of a case where the arrangement position information and the oscillation frequency information are recorded as the oscillation track information. However, when only the arrangement position information or only the oscillation frequency information is recorded, Can be realized without loss of generality if only the information on the arrangement position or the oscillation frequency is valid. In particular, when the arrangement position or the displacement pattern is determined as a standard of the disk, information not specified in the standard may be stored in the disk. It is preferable that the swing track information is recorded in a part of the data of the management data area for recording the contents of the disc and the like.
In the following description, it is assumed that the swing track information is recorded in an area other than the management data area.

First, in the ordinary management data area, the fourth embodiment
As described above, the management data 65 is repeatedly arranged, and rocking track information 67 is recorded in each management data 65 in addition to the disk management data 66. The swing track information 67 records arrangement position information 68 and swing frequency information 69 where the swing track is arranged.

Arrangement position information 68 in the management data area 63
Record the track number (or address number) where the swing track 64 exists. In addition, the swing frequency information 69 includes the swing frequency f of the swing track 64 formed.
Record wb.

The pit row is oscillated in the oscillating track 64 indicated by the oscillating track arrangement position information 68 at the frequency indicated by the oscillating frequency information 69 and a predetermined amplitude.
The swing track may be one track or may be provided continuously on a plurality of tracks, but it is not necessary to make the area so wide.

By adopting the disk configuration shown in the fifth embodiment, it is not necessary to provide a swinging track in a wide area, and a disk creator can specify a swinging track at an arbitrary position at an arbitrary frequency. It is possible to provide encryption for identification.

Next, a sixth embodiment will be described. FIG. 9 is a schematic diagram of an optical disk device with an unauthorized copy disk identification function according to the sixth embodiment. In FIG. 9, reference numeral 1 denotes an optical disk with an unauthorized copy prevention function as described in the first or fourth embodiment, 4 denotes a pit on the disk 1, 5 denotes a track formed as a pit row, 7 denotes a displacement pit row, 8 Is a light spot. 70 is a disk motor for rotating the disk 1, 71 is an optical head for optically reproducing pit signals on the disk 1, and 72 is an optical spot 8 and a track 5
A tracking error signal detecting section 73 for detecting a tracking error signal TE corresponding to the radial positional deviation amount of the optical head 71; a differential circuit 74 for obtaining a differential of a reproduction signal from the optical head 71;
Is a low-pass filter that removes high-frequency components of the tracking error signal, 75 is a phase compensator that generates a head drive control signal from the tracking error signal, 76 is a head driver that drives the optical head, and 77 is a reproduction signal that is generated from the optical head. Adder circuit 78, a binarization circuit section for binarizing the reproduction signal and detecting the synchronization of data, 79 a signal processing section for demodulating the reproduction signal and reading out information, and 80 a displacement pit row section from the tracking error signal. Displacement pit row detector for detecting, 8
Reference numerals 1 and 82 denote voltage comparators included in the displacement pit string detection unit 80, 98 denotes an OR circuit, and 92 denotes a disk determination unit that identifies a disk.

The operation method of the optical disk device configured as described above will be described with reference to FIGS. Here, an optical disk having a displacement pit row of the first embodiment will be described as an example.

Here, the disk 1 rotates and the track 5
The operation of performing tracking control in which the light spot 8 follows above is the same as the method described in the conventional example. The process of reading information from the reproduced signal and the process of generating the tracking error signal are the same as in the conventional example.

FIG. 10 is a diagram showing the principle of operation of the displacement pit train detector 80 for detecting the displacement pit train 7 from the tracking error signal.

The displacement pit row may be displaced toward the outer periphery with respect to the track center line (a) or may be displaced toward the inner periphery (b). When the light spot 8 passes through the displacement pit row 7, the light spot 8
As a result, the level shift occurs in the displacement pit row 7 so that a sharp level fluctuation occurs in the tracking error signal, as shown in FIG. The direction in which the level of the tracking error signal TE fluctuates at this time depends on the direction of displacement of the displacement pit row 7. Here, in FIG. 10A, it fluctuates to the positive side, and in FIG. 10B, it fluctuates to the negative side. Therefore, the displacement pit row detection unit 80 can detect the presence of the displacement pit row 7 by comparing the fluctuation level of the tracking error signal TE when passing through the displacement pit row with a preset slice level. Here, the slice level REF (+) is set to detect the displacement in the outer circumferential direction, and the slice level REF (−) is set to detect the displacement in the inner circumferential direction. In steps 81 and 82, the level of the signal is compared with the level of the tracking error signal TE. As a result, DET (+) is detected in synchronization with the outer circumferential displacement pit row 7 and DET (-) is detected in synchronization with the inner circumferential displacement pit row 7, and the presence of the displacement pit row is detected. DET (+) and DET (-) are O
An R circuit 98 inputs the ID pit signal to the disc determination section 92 as an IDDET signal indicating whether or not a displacement pit row exists.

Here, the disk determination unit 92 determines that DET
When neither (+) nor DET (-) is detected (IDDET =
L) recognizes that there is no displacement pit row and determines that the disc is not an original disc. On the other hand, DET (+), D
When either one of ET (-) is detected (IDDE
T = H), it is determined that the disc is an original disc.

9 and 10, the displacement pit train detector 80 detects the level of the tracking error signal TE. However, as shown in FIG.
Can be detected by a differentiating circuit. In FIG. 11, 95 is a differentiating circuit, and 96 and 9
7 is a voltage comparator. The tracking error signal TE passes through a differentiating circuit 95 to obtain a waveform like a TED signal. This TED signal is the slice level REF2
It is detected by DET2 (+) and DET2 (-) whether or not it exceeds the positive side at (+) and on the negative side at the slice level REF2 (-). That is, DET2 (+) or DET2
The presence of the displacement pit row 7 can also be identified based on whether (-) is detected.

Even when the disk is the optical disk having the oscillating track according to the fourth embodiment, the level fluctuation due to the fluctuation occurs in the tracking error signal, and this level fluctuation causes the slice levels REF (+) and REF (-) to change. As a result, DET (+),
DET (-) is output. Therefore, the disk determination unit 9
In step 2, the disc may be identified based on whether or not DET (+) and DET (-) are output.

Next, a seventh embodiment will be described. FIG.
FIG. 14 is a configuration diagram of an optical disk device with an unauthorized copy disk identification function in a seventh embodiment. In FIG. 12, reference numeral 1 denotes an optical disk with an unauthorized copy prevention function described in the second embodiment;
Is a pit on the disk 1, 5 is a track formed as a pit row, 8 is a light spot, 14 and 15 are a displacement pit row ID1 and a displacement pit row ID2 arranged in a displacement pattern. Here, a case where the pattern of the displacement pit row is identified using two displacement pit rows will be described as an example. 70, 71, 72, 73, 74, 75, 7
6, 77, 78, 79, 80, 81, 82, 92 are the sixth
This is the same as the embodiment, and in the seventh embodiment, a pattern match detection unit 83 for newly determining whether or not the pattern of the displacement pit row matches the predetermined pattern is provided.

The operation method of the optical disk device configured as described above will be described with reference to FIGS.

FIG. 13 shows two displacement pit strings I
D114 and ID215 are the outer peripheral side displacement pit rows, respectively.
This shows a case where the tracking error signal TE is configured as an inner peripheral side displacement pit row. As described above, the tracking error signal TE causes a level change in each of the displacement pit row portions. Detect and DET
(+) And DET (-) are output. Since the disc identification condition is that DET (+) and DET (-) are detected in a predetermined pattern, in this example, DET (+) is detected first, and then DET (+). -) Should be detected. Therefore, the pattern matching detection unit 83 compares the predetermined output patterns of DET (+) and DET (-) with the patterns of DET (+) and DET (-) actually output from the displacement pit row detection unit. When they match, a match signal IDDET is output. That is, when the coincidence signal IDDET is output, it may be determined that the disc is the original disc. This determination is performed by the disk determination unit 92.

Next, an eighth embodiment will be described. FIG.
FIG. 19 is a schematic diagram of an optical disk device with an unauthorized copy disk identification function according to an eighth embodiment. In FIG. 14, reference numeral 51 denotes an optical disk with an unauthorized copy prevention function described in the fourth embodiment, 4 denotes pits on the disk 51, and 54 denotes a swinging track composed of a series of pits swinging in a radial direction at a predetermined frequency and amplitude. It is. Reference numeral 85 denotes an oscillating track detecting unit, 86 denotes an oscillating track amplitude measuring unit, and 87 denotes an oscillating amplitude amplitude comparing unit.

Here, 70, 71, 72, 73, 74,
75, 76, 77, 78, 79, and 92 operate in the same manner as in the sixth embodiment with the same configuration.

The operation method of the optical disk device configured as described above will be described with reference to FIGS.

FIG. 15 shows the principle of operation of the swing track detector 85 detecting the swing track 54.
In the normal track 55 in which the track does not swing, the light spot 8 is positioned on the center line of the track, and the tracking error signal has a value near zero.
When the light spot 8 is on the swing track 54, the light spot 8 cannot follow the swing of the track as described above,
A tracking error signal TE as shown in FIG. 15 is detected. The tracking error signal TE is input to an amplitude measuring section 86 having a frequency characteristic of selectively passing only a specific frequency (oscillation frequency) fwb as shown in FIG. As a result, the output signal Awb of the amplitude measuring section 86 has a small amplitude in the normal track 55 area and is output as an amplitude fluctuation in the swing track 54. Then, the amplitude comparator 87 compares whether the Awb signal has exceeded a predetermined slice level REFwb, and outputs the detection signal IDDET when the signal has exceeded. Therefore, when IDDET is detected, the swing track exists, and it is determined that the disc is an original disc. This determination is made by the disk determination unit.

The swing track detecting section 85 can be realized by the configuration shown in FIG. 17 in addition to the configuration of the amplitude measuring section 86 and the amplitude comparing section 87 as shown in FIG. In FIG. 17, reference numeral 88 denotes a frequency characteristic measuring unit for measuring a frequency spectrum, and 89 denotes an amplitude analyzing unit for detecting whether there is a frequency component exceeding a reference level.

FIG. 18 shows how the swing track detector 90 operates. The frequency characteristic measuring section 88 sets an appropriate measurement section, and the tracking error signal TE within this section.
Measure the frequency spectrum of FIG. 18 illustrates the case of a measurement section 56 on the normal track 55 and a measurement section 57 on the swing track 54. Measurement section 56, 5
7, the signal component at each frequency is measured, and the frequency spectrum is as shown in the figure. Next, the amplitude analysis unit 89 calculates the reference amplitude R among the obtained amplitudes of the frequency components.
It is checked whether there is a frequency component exceeding EFwb2, and if there is an amplitude exceeding EFwb2, it is checked whether the frequency is the predetermined swing amplitude frequency fwb. As a result, when the frequency is fwb, it is determined that there is a swing track, and the detection signal IDDET is output as H (measurement section 57). However, all frequency components have the reference amplitude REFwb2
If smaller, or if the frequency of the frequency component exceeding REFwb2 does not match the swing frequency fwb, it is output as a detection signal IDDET = L, indicating that there is no swing track (measurement section 58). .

As described above, the presence or absence of a swing track can be determined based on the output of the detection signal IDDET.

Next, a ninth embodiment will be described. FIG.
FIG. 19 is a schematic diagram of an optical disk device with an unauthorized copy disk identification function according to the ninth embodiment. In FIG. 19, reference numeral 31 denotes an optical disk described in the third embodiment. In the management data area 33, the disk management data 36 and the displacement position information 3 of the displacement pit row are stored.
8 is recorded, and a displacement pit row 41 is formed at the position specified by the arrangement position information 36.

Reference numeral 91 denotes a position information detecting unit for reading the arrangement position information, and reference numeral 92 denotes a disk determining unit. Also, 70, 7
1, 72, 73, 74, 75, 76, 77, 78, 7
Reference numerals 9 and 80 operate in the same manner as in the sixth embodiment.

The operation will be described below with reference to FIGS.

FIG. 20 is a flowchart showing the operation of the ninth embodiment. First, when reproducing the disk 31, the management data area 31 of the disk is reproduced (s1). In the management data area 31, disk management data 36 indicating the content and position of information recorded on the disk 31 is recorded, and this management data is usually reproduced at the start of reproduction. It is assumed that on the disk 31 on which the displacement pit row is formed according to the present invention, arrangement position information 37 indicating an address position where the displacement pit row is arranged is recorded in a part of the management data area 31. Therefore, the position information detection unit 91
Displacement pit row arrangement position information 3 from data to be reproduced
7 is read and stored (s2).

Next, the optical head 71 is moved to the address indicated by IDADR (s3). It is checked whether or not the displacement pit row 41 exists at this address position (s
4). When the displacement pit train exists, the detection signal IDDET from the displacement pit train detection unit 80 is H,
When DDET = H, it is determined that the disc is an original disc (s5). On the other hand, if IDDET remains L,
Since it means that there is no displacement pit row, it is determined that the disc to be reproduced is not the original disc (s6). This disc determination is performed by the disc determination unit 92.

In the ninth embodiment, the displacement pit train 41
Although the disk 31 having the above description has been described, it is possible to determine the disk by the same operation in the disk 61 having the swing track formed at the designated position as in the fifth embodiment. In this case, the position information detecting section 91 reads the arrangement position information 68 in which the swing track is arranged while reproducing the management data area 63 in the disk 61.

The swing track detecting section 85 (or 90) described in the eighth embodiment is provided in place of the displacement pit row detecting section 88, and the IDD is detected at the designated address position.
It may be determined whether or not the disc is an original disc based on whether or not ET becomes H.

Next, a tenth embodiment will be described. FIG.
FIG. 1 is a schematic diagram of an optical disk device with an unauthorized copy disk identification function according to a tenth embodiment. In FIG. 21, 31 is the third
In the optical disk described in the embodiment, the disk management data 36 and the displacement pattern information 39 of the displacement pit row are recorded in the management data area 33, and the determined track position 34
Is a disk in which a displacement pit row is formed in the pattern indicated by the displacement pattern information.

Reference numeral 93 denotes a displacement pattern information detector for reading displacement pattern information, and reference numeral 83 denotes the same as the pattern coincidence detector of the seventh embodiment. 70, 71, 72, 73, 7
4, 75, 76, 77, 78, 79, 80, 92 are the sixth
The same operation is performed with the same configuration as the embodiment.

The operation will be described below with reference to FIGS.

FIG. 22 is an operation flowchart of the tenth embodiment. The operation will be described with reference to FIGS.

First, the management data area 33 is reproduced at the start of disc reproduction (s11). At this time, the displacement pattern information (IDPAT) 39 of the displacement pit row recorded in a part of the management data area 33 is read out and stored by the displacement pattern information detecting section 93 (s12). The displacement pattern information (IDPAT) 39 is transmitted to the pattern matching detection unit 8.
3 is set as a reference pattern to be compared (s13).
Next, it is checked whether or not a displacement pit row exists at a track position 34 where a displacement pit row is considered to exist (s14). If the displacement pit train exists in the determined pattern, the output IDDET of the pattern match detection unit 83 becomes H, so that the disc is determined to be the original disc (s1).
5). If IDDET remains L, it means that the specified displacement pit string does not exist, and it is determined that the disc is not an original disc (s16). This determination is made by the disk determination unit 92.

Incidentally, the arrangement position information of the displacement pit row of the ninth embodiment and the displacement pattern information of the tenth embodiment may be used for the determination at the same time. That is, it is sufficient to check whether or not the displacement pit row indicated by the displacement pattern information exists at the position indicated by the arrangement position information of the displacement pit row.

Next, an eleventh embodiment will be described. FIG.
FIG. 3 is a schematic view of an optical disk device with an illegally copied disk identification function according to the eleventh embodiment. In FIG. 23, 61 is the fifth
In the optical disk described in the embodiment, the disk management data 66 and the rocking frequency information 69 of the rocking track are recorded in the management data area 63, and the rocking track 64 is formed at the rocking frequency specified in the rocking frequency information. This is a disc that has been burned.

Reference numeral 94 denotes a swing frequency information detector for reading the swing frequency information, reference numeral 85 denotes a swing track detector described in the eighth embodiment, and reference numeral 92 denotes a disk discriminator.

Also, 70, 71, 72, 73, 74, 7
5, 76, 77, 78, and 79 operate in the same manner as in the sixth embodiment with the same configuration.

The operation will be described with reference to FIGS.

FIG. 24 is an operation flowchart of the eleventh embodiment. First, the management data area 63 is reproduced at the start of disc reproduction (s21). At this time, the oscillation frequency information (IDF) recorded in a part of the management data area 63
WB) 69 is read out and stored in the swing frequency information detection unit 94 (s22). This oscillation frequency information (IDFW
B) 69 is set as a reference frequency to be compared by the swing track detection unit 85 (s23). Next, it is checked whether a swing track exists at a track position where the swing track is considered to exist (s24). If there is an oscillating track 64 formed at the specified oscillating frequency (IDFWB), the output IDDET of the oscillating track detector 85 becomes H, so that the disc is determined to be an original disk (s2).
5). If IDDET remains L, it means that the specified swing track does not exist, and it is determined that the disc is not an original disc (s26). This determination is made by the disk determination unit 92.

When using the amplitude measuring unit 86 in FIG. 16 as the configuration of the swing track detecting unit 85, a unit having a variable passing frequency fwb is used. When the frequency characteristic measuring unit 88 of FIG. 17 is used, the frequency specified by IDFWB may be compared by the amplitude analyzing unit 89.

Note that the arrangement position information of the oscillating track of the ninth embodiment and the oscillating frequency information of the eleventh embodiment may be used for the determination at the same time. That is, it is sufficient to check whether or not the track having the swing frequency indicated by the swing frequency information exists at the position indicated by the arrangement position information of the swing track.

[0089]

As described above, according to the present invention, a part of a track composed of a pit row can be detected in the signal band of the tracking error signal and has a small influence on the reading of the reproduction signal from the track center line in the radial direction. A displacement pit train is provided on a part of the disk so that the presence of the displacement pit train can be identified by the fluctuation level of the tracking error signal in the displacement pit train. This makes it possible to identify a copy disk having no displacement pit train. In addition, the arrangement position information / displacement pattern information of the displacement pit row is recorded in a part of the data as disc-specific identification information, and the presence / absence of the displacement pit row of the specific pattern at the specific position of the displacement pit row is identified. Thus, the encryption can be further improved.

Further, an oscillating track obtained by oscillating a track formed of a pit row in a radial direction by a specific frequency which cannot be followed by the tracking control and by an amplitude which does not influence the reading of the reproduced signal is provided on a part of the disk. By judging the presence or absence of an oscillating track based on the signal level of a specific oscillating frequency component in the tracking error signal, it is possible to distinguish between an original disc having this oscillating track and a copy disc having no oscillating track. And Also, the position information and frequency information of the oscillating track are recorded in a part of the data as disc-specific identification information,
By examining the signal level of the specific swing frequency component at the specific position, the disc can be identified, and the encryption can be further improved.

[Brief description of the drawings]

FIG. 1A is a diagram showing an entire optical disc according to a first embodiment; FIG. 1B is an enlarged view of a disc identification area;

FIG. 2 is a diagram showing a relationship between a positional deviation amount and a reproduction signal and a tracking error signal.

FIG. 3 is a diagram showing a response waveform in a displacement pit row portion.

FIG. 4 is a diagram showing a displacement pit row according to a second embodiment.

5A is a diagram showing the entire optical disc of the third embodiment. FIG. 5B is a diagram showing a management data area. FIG. 5C is a diagram showing a displacement pit arrangement track.

FIG. 6A is a diagram showing the entire optical disc of the fourth embodiment, and FIG. 6B is an enlarged view of a disc identification area.

FIG. 7 is a waveform diagram of a reproduction signal and a tracking error signal in an oscillating track.

8A is a diagram showing the entire optical disc of the fifth embodiment. FIG. 8B is a diagram showing a management data area. FIG. 8C is a diagram showing a swing track.

FIG. 9 is a block diagram of an optical disc device according to a sixth embodiment.

FIG. 10 is a diagram showing an operation principle diagram of a displacement pit row detection unit.

11A is a diagram showing a detection circuit using a differentiating circuit, and FIG. 11B is a diagram showing a detection principle using a differentiating circuit.

FIG. 12 is a block diagram of an optical disc device according to a seventh embodiment.

FIG. 13 is a diagram showing a detection principle according to a seventh embodiment.

FIG. 14 is a block diagram of an optical disc device according to an eighth embodiment.

FIG. 15 is a diagram showing the principle of operation of the swing track detection unit.

FIG. 16 is a diagram illustrating frequency characteristics of an amplitude measuring unit.

FIG. 17 is a block diagram of a second embodiment of the swing track detection unit;

FIG. 18 is a diagram showing an operation principle in the second embodiment.

FIG. 19 is a block diagram of an optical disc device according to a ninth embodiment;

FIG. 20 is a flowchart of a ninth embodiment.

FIG. 21 is a block diagram of an optical disc device according to a tenth embodiment.

FIG. 22 is a flowchart of a tenth embodiment.

FIG. 23 is a block diagram of an optical disk device according to an eleventh embodiment.

FIG. 24 is a flowchart of an eleventh embodiment.

FIG. 25 is a block diagram showing a conventional tracking control block.

[Explanation of symbols]

 Reference Signs List 1 disc 2 lead-in area 3 disc identification area 4 pit row 5 track 6 center pit row 7 displacement pit row 8 light spot 9, 10, 11, 12, 13 center pit row 14 displacement pit row ID 1 15 displacement pit row ID 2 16 identification Pit part 31 Disk 32 Lead-in area 33 Management data area 34 Displacement pit arrangement track 35 Management data 36 Disk management data 37 Displacement pit information 38 Placement position information 39 Displacement pattern information 40 Track 41 Displacement pit row or identification pit part 42 Pit 51 Disc 52 Lead-in area 53 Disk identification area 54 Swing track 55 Normal track 56, 67 Measurement section 61 Disk 62 Lead-in area 63 Management data area 64 Swing track 65 Management data 66 Disk management data Data 67 oscillating track information 68 arrangement position information 69 oscillating frequency information 70 disk motor 71 optical head 72 tracking error signal detector 73 differential circuit 74 low-pass filter 75 phase compensator 76 head drive 77 adder circuit 78 2 Value conversion circuit section 79 Signal processing section 80 Displacement pit row detection section 81, 82 Voltage comparator 83 Pattern match detection section 85 Oscillation track detection section 86 Amplitude measurement section 87 Amplitude comparison section 88 Frequency characteristic measurement section 89 Amplitude analysis section 90 Oscillation Moving track detecting section 91 Position information detecting section 92 Disk determining section 93 Displacement pattern information detecting section 94 Oscillating frequency information detecting section 95 Differentiating circuit 96, 97 Voltage comparator 98 OR circuit 200 Disk 201 Track 202 Light spot 210 Disk motor 211 Light Head 212 semiconductor laser 213 Collimating lens 214 Objective lens 215 Half mirror 216a, 216b Light receiving section 217 Actuator 220 Tracking error signal detecting section 221 Differential circuit 222 Low pass filter 223 Phase compensating section 224 Head driving section 225 Addition circuit 226 Binarization circuit section 227 Signal processing section

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G11B 7/24 565 G11B 7/24 565K 565M 571 571B 20/10 20/10 H 321 321Z 20/12 20 / 12 (72) Inventor Shunji Ohara 1006 Kadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Inventor Takashi Ishida 1006 Odaka, Kazuma, Kadoma City, Osaka Pref. I 1006 Kadoma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. 1006 Matsushita Electric Industrial Co., Ltd. (72) Inventor Hiroki Exit 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric 5D029 PA03 WA18 5D044 BC03 CC04 DE37 DE50 DE57 FG18 HL08 5D090 AA01 BB02 CC04 CC14 DD01 DD05 FF02 FF09 GG03 GG10 GG32 JJ11 5D118 BA01 BC08 BC11 BF02 CD03 CD06

Claims (13)

[Claims] 1. A disk having a track formed by a spiral or concentric information pit row, wherein a signal fluctuation which can be detected in a tracking error signal band is generated in a part of a specific radial area of the disk. An optical disc with an illegal copy preventing function, comprising a displacement pit row in which the information pit row is displaced in a track radial direction from a center line of the information pit row over a track length. 2. A method according to claim 1, further comprising: a plurality of said displacement pit rows arranged at predetermined time intervals, wherein each of the displacement pit rows has an identification pit portion composed of a set of displacement pit rows having pattern information. 2. An optical disk with an unauthorized copy prevention function according to claim 1, wherein: 3. An optical disk with an unauthorized copy prevention function according to claim 1, wherein the optical disk has an area in which information on the position where a displacement pit row or an identification pit portion exists is recorded. 4. An optical disk with an unauthorized copy prevention function according to claim 2, wherein the optical disk has an area in which information on a combination of displacement directions of each displacement pit row in the identification pit portion is recorded. 5. A disk having a track formed by a spiral or concentric information pit row,
An oscillating track oscillated in a radial direction at a frequency higher than the vicinity of the control gain intersection point of the tracking control and with an amplitude that does not affect the reading of the information signal is provided in a specific radius area of the disk. An optical disk with an illegal copy protection function. 6. An optical disk with an illegal copy preventing function according to claim 5, wherein the optical disk has an area in which information on the position where the swing track exists is recorded. 7. The optical disk with an unauthorized copy preventing function according to claim 5, wherein the optical disk has an area in which swing frequency information of a swing track is recorded. 8. The method of claim 1, 2, 3, 4, 5, 6, or 7.
An optical head for irradiating a light beam onto the optical disk with an unauthorized copy prevention function according to the above, receiving the reflected light, converting the reflected light into an electric signal and outputting it as a reproduction signal; A tracking error signal detection unit that outputs the amount of positional deviation from the center line of the information pit row as a tracking error signal; and a displacement pit that detects the presence of the displacement pit row or the swing track from a level change of the tracking error signal. An optical disc device comprising: a row detection section; and a disc determination section that determines whether or not the disc is a copy disc based on an output of the displacement pit row detection section. 9. The optical disc apparatus according to claim 8, further comprising a displacement pattern coincidence detecting section for detecting whether or not the identification pit portion is constituted by a pattern of a predetermined displacement pit row. 10. A oscillating track detecting section for detecting whether or not the fluctuation frequency of the tracking error signal level is the same as the oscillating frequency of the oscillating track. Optical disk device. 11. An arrangement position information detecting section for detecting position information where a displacement pit row or the oscillating track exists, and
11. The optical disk device according to claim 8, further comprising: a disk determination unit configured to determine whether a displacement pit row or a swing track exists at a position indicated by the arrangement position information. 12. A displacement pattern information detecting section for reading and storing displacement pattern information of an identification pit portion, and detecting whether or not an appearance pattern of a sequence of displacement pits from a disc matches the content of the displacement pattern information detecting section. The optical disk device according to claim 9, further comprising a displacement pattern coincidence detection unit. 13. A swing frequency information detecting section for reading and storing swing frequency information of a swing track, and detecting whether or not a frequency component specified in the swing frequency information exists in a tracking error signal. 11. The optical disk device according to claim 10, further comprising a swing track detection unit.