Source: http://www.google.com/patents/US20050163030?dq=5,987,610
Timestamp: 2017-12-13 23:23:00
Document Index: 264711535

Matched Legal Cases: ['art 715', 'art 721', 'art 738', 'art 739', 'art 740', 'art 744', 'art 743', 'art 742', 'art 744', 'art 746', 'art 820']

Patent US20050163030 - Optical recording medium and recording method for the same - Google Patents
A main information area 31 capable of recording an information signal and a subsidiary information area 32 for recording subsidiary information that is different from the information signal are divided in one principal plane direction of a substrate, and an information layer for recording the information...http://www.google.com/patents/US20050163030?utm_source=gb-gplus-sharePatent US20050163030 - Optical recording medium and recording method for the same
Publication number US20050163030 A1
Application number US 11/085,398
Also published as CN1284150C, CN1321301A, DE60031835D1, DE60031835T2, DE60041608D1, DE60042503D1, EP1152402A1, EP1152402A4, EP1152402B1, EP1650750A1, EP1650750B1, EP1650751A1, EP1650751B1, US7061850, US7136348, US7170839, US7170848, US7200102, US20050163009, US20050163027, US20050163028, WO2001006502A1
Publication number 085398, 11085398, US 2005/0163030 A1, US 2005/163030 A1, US 20050163030 A1, US 20050163030A1, US 2005163030 A1, US 2005163030A1, US-A1-20050163030, US-A1-2005163030, US2005/0163030A1, US2005/163030A1, US20050163030 A1, US20050163030A1, US2005163030 A1, US2005163030A1
Inventors Hiroaki Irie, Keiichiro Horai, Kenichi Nishiuchi, Mitsuaki Oshima
Patent Citations (17), Referenced by (17), Classifications (50), Legal Events (3)
US 20050163030 A1
19. An optical recording medium provided with a main information area having a laminated thin film layer including an information layer capable of recording an information signal and a subsidiary information area for recording subsidiary information that is different from the information signal, which are divided in one principal plane direction of a substrate,
wherein the information layer for recording the information signal in the main information area is provided also in a lead-in area including the subsidiary information area,
medium identification information for distinguishing the medium optically by an optical head used for recording the information signal in the information layer of the main information area is recorded in the information layer of the subsidiary information area in the lead-in area with a modulation method that is different from a light beam modulation method used for recording the information signal in the information layer of the main information area, and
a plurality of encryption keys used for encrypting an encryption key of the information signal to be recorded in the main information area is provided in an outer periphery of the subsidiary information area in the lead-in area.
20. The optical recording medium according to claim 19, wherein the encryption key of the information signal is encrypted by calculation of the plurality of encryption keys and the medium identification information in the lead-in area.
FIG. 11 (1) to 11 (3) are views each showing an example of a wave form chart of a laser output in another example of recording medium identification information of the present invention, wherein
FIG. 11 (1) is a wave form chart of a laser output when medium identification information is recorded;
FIG. 11 (2) is a wave form chart of a laser output during a phase conversion process; and
FIG. 11 (3) is a wave form chart of a laser output when medium identification information is recorded and the phase conversion process is performed at the same time.
FIG. 15 (a) is a block diagram showing an example of a modulation part in a recording device of the present invention; and
FIG. 15 (b) is a block diagram showing an example of a demodulation part in a reproduction device of the present invention.
FIG. 16 (a) is a structural view of data for BCA, where n=12 and 188 bytes in an example of the present invention; and
FIG. 16 (b) is a structural view of data for BCA, where n=1 and 12 bytes in an example of the present invention.
FIG. 17 (a) is a structural view of data for BCA, where n=1 and 12 bytes in an example of the present invention; and
FIG. 17 (b) is a structural view of virtual data created by adding 0 for an ECC operation for BCA, where n=1 and 12 bytes in an example of the present invention.
FIG. 18 (a) is a structural view of data showing an example of synchronous codes of BCA of the present invention; and
FIG. 18 (b) is a structural view of data showing a fixed synchronous pattern of BCA in an example of the present invention.
First, the starting sequence 41 will be explained. In the step 41 a, the spindle motor 2 is driven by the rotation controller 3 according to the instruction given from the operation control system 12, and the optical disc 1 is rotated at a constant angular velocity (CAV state). In the step 41 b, the feed motor 9 controlled by the feed motor controller 10 rotates screws 13 that support the optical pick-up 4, thereby shifting the optical pick-up 4 in the radial direction of the optical disc 1 to the starting position of subsidiary information recording. In the step 41 c, based on the instruction given from the operation control system 12, the laser power controller 5 drives a high output laser 14 such as a semiconductor laser used as the light source. A light beam emitted from the laser 14 is directed through the optical system of the optical pick-up 4 and a final objective lens 15 to the optical disc. At this time, the power of light emitted from the laser 14 is of such a degree that the recording layer 23 of the optical disc 1 is not crystallized. In the step 41 d, the focus controlling is performed in which the light beam emitted from the laser 14 is focused on the recording film of the optical disc 1. The light reflected from the optical disc 1 is detected by an optical detector 16 and output from the optical director 16 as an electric signal. This output signal is amplified by a preamplifier 17 and input to the focus controller 8. Based on the input signal from the optical detector, the focus controller 8 drives a voice coil 18 of the optical pick-up 4 so as to shift the objective lens 15 slightly in the vertical direction of the optical disc and thereby controls the light beam to be focused on the recording film. In the step 41 e, the position detector 11 detects the position of the optical pick-up and transmits the position information to the operation control system 12. In the step 41 f, based on the obtained position information, the operation control system 12 detects that the position of the light beam is located in the starting position of subsidiary information recording. Then, the operation control system 12 outputs a subsidiary information recording signal to the waveform setter 7 and also starts the BCA recording sequence 42. When the position of the light beam is not located in the starting position of subsidiary information recording, the operation control system 12 sends a signal to the feed motor controller 10, and the feed motor controller 10 drives the feed motor 9 based on this signal so as to shift the optical pick-up 4 slightly to the starting position of subsidiary information recording. Thereafter, the operation returns to the step 41 e.
Next, the BCA recording sequence 42 will be explained. In the step 42 a, as shown in FIG. 5 (1), the recording data (subsidiary information) such as identification information to be recorded on the optical disc 1 is encoded so as to generate a BCA pattern (recording signal) as illustrated in FIG. 5 (2). In the step 42 b, the waveform setter 7 generates a laser modulation waveform based on the BCA pattern. Based on the BCA signal sent from the BCA signal generator 6 and the rotational frequency from the operation control system 12, the waveform setter 7 forms the laser modulation waveform, which is a reversed waveform of the BCA signal as shown in FIG. 5 (3), by taking one rotation pulse signal from the rotation controller 3 as the timing. Furthermore, the waveform setter 7 outputs the laser modulation waveform in the case where a subsidiary information recording signal is input from the operation control system 12, and in the case where a subsidiary information recording signal is not input, a bias output is performed, which has a lower power than that of the subsidiary information recording signal, such as a reproduction output or the like. While the optical disc 1 rotates one cycle, the step 42 c and the step 42 d are performed at the same time. In the step 42 c, BCA is recorded on the optical disc 1. The laser power controller 5 drives the laser based on the laser power value instructed by the operation control system 12 and the laser modulation waveform from the waveform setter 7, and the laser beam is output as illustrated in FIG. 5 (4). With regard to the light power of FIG. 5 (4), the power 51 a is a laser power capable of providing the necessary energy for crystallizing the recording film 26 of the optical disc 1, and the power 51 b is power of such a degree that the recording layer 26 of the optical disc 1 is not crystallized (for example, reproduction power).
Next, with reference to FIG. 6, the step of recording BCA onto the optical disc 1 by the light power shown in FIG. 5 (4) will be explained. A light beam 61 is focused on the recording film 26 of the optical disc 1 and is moved relatively on the optical disc 1 by rotating the optical disc 1 (the travelling direction of the optical disc 1 is indicated with the arrow in FIG. 6). Based on the laser modulation waveform generated by the waveform setter 7, the laser power controller 5 modulates the output power of the laser beam. When the light power is 51 a, the recording film 26 is crystallized. On the other hand, when the light power is 51 b, the recording film 26 remains in the state in which the film was formed (mainly in the amorphous state), so that the recording film 26 is crystallized intermittently for recording BCA.
First, the starting sequence 41 will be explained. In the step 41 a, the spindle motor 2 is driven by the rotation controller 3 according to the instruction given from the operation control system 12, and the optical disc 1 is rotated at a constant angular velocity (CAV state). In the step 41 b, the feed motor 9 rotates the screws 13 that support the optical pick-up 4, thereby shifting the optical pick-up 4 in the radial direction of the optical disc 1 to the starting position of subsidiary information recording. In the step 41 c, based on the instruction given from the operation control system 12, the laser power controller 5 drives the laser 14. A light beam emitted from the laser 14 is directed through the optical system of the optical pick-up 4 and the final objective lens 15 to the optical disc. At this time, the power of light emitted from the laser 14 is of such a degree that the recording layer 23 of the optical disc 1 is not crystallized. In the step 41 d, the focus controlling is performed in which the light beam emitted from the laser 14 is focused on the recording film of the optical disc 1. In the step 41 e, the position detector 11 detects the position of the optical pick-up and transmits the position information to the operation control system 12. In the step 41 f, based on the obtained position information, the operation control system 12 detects that the position of the light beam is located in the starting position of subsidiary information recording. Then, the operation control system 12 outputs a subsidiary information recording signal to the waveform setter 7 and also starts the BCA recording sequence 42. When the position of the light beam is not located in the starting position of subsidiary information recording, the operation control system 12 sends a signal to the feed motor controller 16, and the feed motor controller 10 drives the feed motor 9 based on this signal so as to shift the optical pick-up 4 slightly to the starting position of subsidiary information recording. Thereafter, the operation returns to the step 41 e.
Next, the BCA recording sequence 42 will be explained. In the step 42 a, the recording data (subsidiary information) to be recorded on the optical disc 1 such as identification information is encoded so as to generate a BCA pattern (recording signal). In the step 42 b, the waveform setter 7 generates a laser modulation waveform based on the BCA pattern. On the basis of the BCA signal sent from the BCA signal generator 6 and also of the rotational frequency from the operation control system 12, the waveform setter 7 forms the laser modulation waveform, which is a reversed waveform of the BCA signal, by taking one rotation pulse signal from the rotation controller 3 as the timing. Furthermore, the waveform setter 7 outputs the laser modulation waveform in the case where a subsidiary information recording signal is input from the operation control system 12, and in the case where a subsidiary information recording signal is not input, a bias output is performed. While the optical disc 1 rotates one cycle, the step 42 c and the step 42 d are performed at the same time.
In the step 42 c, BCA is recorded on the optical disc 1. The laser power controller 5 drives the laser based on the laser power value instructed by the operation control system 12 and the laser modulation waveform from the waveform setter 7, and the laser beam is output as illustrated in FIG. 5 (4). With regard to the light power in FIG. 5 (4), the power 51 a is a laser power capable of providing the necessary energy for crystallizing the recording film 26 of the optical disc 1, and the power 51 b is power of such a degree that the recording layer 26 of the optical disc 1 is not crystallized (for example, reproduction power). As illustrated in FIG. 6, by emitting this modulated light beam to the recording film of the optical disc 1, the recording film 26 is crystallized intermittently so as to record BCA.
First, the starting sequence 41 will be explained. In the step 41 a, the spindle motor 2 is driven by the rotation controller 3 according to the instruction given from the operation control system 12, and the optical disc 1 is rotated at a constant angular velocity (CAV state). In the step 41 b, the feed motor 9 rotates the screws 13 that support the optical pick-up 4, thereby shifting the optical pick-up 4 in the radial direction of the optical disc 1 to the starting position of subsidiary information recording. In the step 41 c, based on the instruction given from the operation control system 12, the laser power controller 5 drives the laser 14. A light beam emitted from the laser 14 is directed through the optical system of the optical pick-up 4 and the final objective lens 15 to the optical disc. At this time, the power of light emitted from the laser 14 is of such a degree that the recording layer 23 of the optical disc 1 is not crystallized. In the step 41 d, the focus controlling is performed in which the light beam emitted from the laser 14 is focused on the recording film of the optical disc 1. In the step 41 e, the position detector 11 detects the position of the optical pick-up and transmits the position information to the operation control system 12. In the step 41 f, based on the obtained position information, the operation control system 12 detects that the position of the light beam is located in the starting position of subsidiary information recording. Then, the operation control system 12 outputs a subsidiary information recording signal to the waveform setter 7 and also starts the BCA recording sequence 42. When the position of the light beam is not located in the starting position of subsidiary information recording, the operation control system 12 sends a signal to the feed motor controller 10, and the feed motor controller 10 drives the feed motor 9 based on this signal so as to shift the optical pick-up 4 slightly to the starting position of subsidiary information recording. Thereafter, the operation returns to the step 41 e.
Next, the BCA recording sequence 121 will be explained. In the step 121 a, the recording data (subsidiary information) to be recorded on the optical disc 1 such as identification information is encoded to generate a BCA pattern (recording signal). In the step 121 b, the waveform setter 7 generates a laser modulation waveform based on the BCA pattern. On the basis of the BCA signal sent from the BCA signal generator 6 and also of the rotational frequency from the operation control system 12, the waveform setter 7 forms the laser modulation waveform by taking one rotation pulse signal from the rotation controller 3 as the timing. Furthermore, the waveform setter 7 outputs a laser modulation waveform in the case where a subsidiary information recording signal is input from the operation control system 12, and in the case where a subsidiary information recording signal is not input, a bias output is performed. While the optical disc 1 rotates one cycle, the step 121 c and the step 121 d are performed at the same time. In the step 121 c, BCA is recorded on the optical disc 1. The laser power controller 5 drives the laser based on the laser power value instructed by the operation control system 12 and the laser modulation waveform from the waveform setter 7, and the laser beam is output as illustrated in FIG. 11 (1). With regard to the light power in FIG. 11 (1), the power 111 a is a laser power capable of providing the necessary energy for breaking the recording film 26 of the optical disc 1 and making holes therein, and the power 111 b is power of such a degree that the recording layer 26 of the optical disc 1 is not crystallized (for example, reproduction power). By emitting this modulated light beam to the recording film of the optical disc 1, holes are formed intermittently in the recording layer and/or the recording film so as to record BCA.
In this embodiment, with respect to the BCA recording waveform, the laser power is determined to be the reproduction power other than for the part of BCA recording as in FIG. 11 (1). However, there is another method of determining the starting position of initialization to be the radial position 34 b of FIG. 3 and determining the laser power to be the initialization power besides the part of BCA recording as in FIG. 11 (3). According to this method, the initialization area is reduced, so that the processing capability can be improved.
With reference to FIG. 15 (a), a modulation method for data will be explained in detail. First, as for data to be recorded, a Reed-Solomon system error correction code (ECC) 717 is appended to data 716 in an ECC appending part 715. FIG. 16 (a) shows a data configuration in which a Reed-Solomon code is calculated for each of the data 716 of 188 bytes and a 16-bytes ECC 717 is appended. FIG. 16 (b) shows a data configuration in the case of recording the data 716 a of 12 bytes. The amount of data in the ECC 717 a is 16 bytes, so that the data size is the same with that of the ECG part having the data of 188 bytes.
The ECC calculation of the present invention operates such that, when the data has 12 bytes, the data 716 a of 12 bytes are not calculated as in the usual manner, but instead, as illustrated in FIG. 17 (b), a virtual data configuration 716 b of 188 bytes is generated in which 0 is inserted in 166 bytes starting from the last row of RS1 through the non-existent RS2 up to the third row of RSn. In this way, the calculation for error correction is carried out to generate the ECC 717 b.
Next, a synchronous code will be explained. FIG. 18 (a) shows synchronous bits 719 a to 719 z. As illustrated in FIG. 18(b), the fixed pattern of the synchronous signal has an interval of 4T, so that it is easier to distinguish 3T of data and the synchronous pattern.
In FIG. 19 and FIG. 20, the input data (1) are the same. However, a code reversing signal is not transmitted in the case of ROM, so that the code reversing part 721 is not operated. Therefore, when the value is “0”, the PE-RZ signal is arranged in the slot on the left side as shown in FIG. 19 (3), and the BCA pattern also is formed on the left side as shown in FIG. 19 (b). On the other hand, a code reversing signal is transmitted in the case of RAM-type media such as DVD-RW, DVD-R and the like, so that when the value is “0”, the PE-RZ signal is arranged in the slot on the right side as shown in FIG. 20 (3), and the BCA pattern is formed on the right side as shown in (c). As a result, the BCA patterns on the discs are different, so that the BCA of ROM and the BCA of RAM can be distinguished. If an illegal company uses this RAM disc of DVD-RW or DVD-R to copy data of a ROM disc, since the BCA pattern is different, it is identified as not being a ROM disc. In this way, it is effective in preventing an illegal use of discs.
In the case of DVD-R or DVD-RW, a PCA area 737 of a trial writing area for power adjustment is provided in the radial range between 22.1(21.9)mm and 22.3(22.1)mm of the inner peripheral portion of BCA. Also, an RMA area 738 for recording the history of power control is provided in the radial range between 22.3(22.1)mm and 22.6(22.4)mm, and a subsidiary guard band 739 of more than 50 μm is provided in the inner peripheral portion of BCA to avoid the interference between the RMA area and the BCA area 728. Thus, the BCA area 728 always is present in the radial range between 22.8 mm and 23.5 mm, and more specifically, between 22.77 mm and 23.45 mm. By reducing the width of the BCA area in the radial direction compared with ROM, both the PCA and the RMA can coexist, and BCA can be used for DVD-R and DVD-RW. In this case, the successive initialization starts at least from the inner peripheral portion and continues to the radius of 22.65 mm. Then, BCA is recorded by emitting the beam intermittently based on the PE-RZ modulation signal. In the radius of 23.57 mm, the beam is switched completely to successive emission, so that BCA can be recorded by initializing and also without breaking the RMA.
With reference to FIG. 15 (b), a method for reproducing BCA will be explained. First, the control data 732 are accessed by the optical head and demodulated in a 8-16 demodulation part 738. The BCA identifier 712 is read out from the demodulated control data, and the operation is stopped when a BCA identifier determination part 739 outputs “0”, i.e. non-existence. On the other hand, when it outputs “1”, i.e. existence, the disc type identifier 711 is read, and only when a disc type identifier determination part 740 indicates that this is a recording type disc such as DVD-R or DVD-RW, a code reversing signal 745 is generated to operate a code reversing part 744.
On the other hand, when the BCA data are reproduced, the optical head is shifted to the BCA area 728 illustrated in FIG. 21 so as to reproduce the BCA signal and to change it to a digital signal by a level slicer 714. Then, a synchronous signal is taken out by a synchronous signal reproduction part 743, and only the BCA data 716 are demodulated by the PE-RZ demodulation part 742. When the code reversing signal 745 mentioned above is turned ON, it is converted as shown in FIG. 20(1′) and FIG. 20(1) in the code reversing part 744, and the values 0 and 1 are reversed. In the case of ROM discs, the code reversing signal 745 is not generated, so that the code is not converted. In this way, the original BCA data are reproduced normally. In the Reed-Solomon error correction part 746, in the case where BCA has less than 188 bytes as in FIG. 17 (b), 0 data are added to virtually create 188 bytes in order to correct errors by calculating ECC. Thus, the BCA signals are output correctly.
The disc used here is a bonded disc, and the BCA inserted in the disc cannot be tampered with, which can be used for security purposes. Furthermore, a DVD-RAM drive and a DVD-RW drive that are commonly available on the market have circular beam spots. Even if an illegal user tries to tamper with the BCA part with the circular beam of this commercial drive or tries to erase BCA, the amorphous state remains between the tracks, so that BCA cannot be erased completely. As a result, commercial drives cannot be used for tampering with the BCA data, and therefore, high security effects can be obtained as a consumer product. On the other hand, a disc that is exactly like a DVD-ROM may be copied by using a group recording type RAM disc such as a DVD-RW or a DVD-R. To prevent this from happening, as explained in FIG. 20, the modulation rule is reversed compared with a ROM disc only in the data part of the PE-RZ modulation by the code polarity reversing part 820 b. Specifically, in the case of ROM, when the BCA data are “0” and “1”, the modulated signals are respectively “01,” for “10”, while the modulated signals are respectively reversed to “01”, “10” in the case of RAM. Thus, the PE-RZ modulated signals in the ROM and the RAM are different, so that the attempt to create a copy of a ROM disc with a RAM disc can be distinguished and detected that it is illegal. As a result, the copy prevention can be achieved.
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U.S. Classification 369/275.3, G9B/7.029, G9B/20.002, G9B/20.059, 369/47.19, 369/53.21, G9B/19.018
International Classification G11B7/125, G11B7/26, G11B7/24, G11B7/0045, G11B20/18, G11B20/12, G11B7/007, G11B20/00, G11B19/12
Cooperative Classification G11B20/00268, G11B20/18, G11B7/00454, G11B20/00876, G11B7/00736, G11B7/007, G11B20/00086, G11B7/26, G11B7/265, G11B7/268, G11B20/1217, G11B19/122, G11B20/1883, G11B2220/20, G11B7/126, G11B7/0045, G11B7/24, G11B19/12
European Classification G11B7/126, G11B7/26, G11B20/18S, G11B7/24, G11B19/12, G11B7/26R, G11B20/00P5A6A1, G11B7/0045, G11B20/18, G11B7/007R, G11B7/26V, G11B20/00P13, G11B7/007, G11B20/12D, G11B20/00P, G11B19/12C