Optical Disk and Optical Disk Device

Abstract

Provided is an optical disk device which: comprises address detection value storage parts for respectively storing address detection values of multiple address information units included in an area unit of an optical disk, which is configured such that the area unit is formed from the multiple address information units, pieces of address information formed in the address information units included in the area unit are the same, and the areas selected for the address information units included in the area unit are different from one another, and a selection / addition part for selecting and adding the address detection values stored in the address detection value storage parts on the basis of areas determined by a detection area determination part; and determines position information on the basis of the areas determined by the detection area determination part.

Description

Technical Field

[0001] The present disclosure relates to an optical disc capable of optical recording, a playback device for the optical disc, and a recording device for the optical disc.

Background Art

[0002] In recent years, the recording density of optical discs has been constantly increasing. In the video field, optical discs such as DVDs and BDs (Blu-ray (registered trademark) Discs) are well known. These optical discs are used for recording videos and, on the other hand, are also used as external recording media for personal computers. Although hard disks, flash memories, etc. are also used as external recording media for personal computers, optical discs have the advantages of long life, high reliability, and no need for storage power compared with those media. Focusing on these advantages, they have attracted attention as archival media for important data such as in data centers. In such a situation, although there is currently an Archival Disc with a capacity of 300 GB, which is the optical disc with the largest capacity, further higher density is desired.

[0003] As a method for increasing the density of optical discs, there is an improvement in the density in the radial direction by narrowing the track pitch. However, narrowing the track pitch also causes a problem that crosstalk, in which the recorded signals of adjacent tracks interfere with each other during playback of the recorded data, increases.

[0004] On the other hand, an optical disc is provided with a physical address for specifying a location where user data is recorded and played back. One method of forming a physical address is a wobble address by meandering of a track (hereinafter referred to as wobble). Recording a physical address by wobble has the merit that the recording capacity does not decrease because signals can be detected by a detection method different from that for recording and playback of user data, and it is widely used in BDs and the like.

[0005] Patent Document 1 discloses an address notation method using wobble that can be reproduced from both lands and groove tracks on a land groove recording disk. The optical disk disclosed in Patent Document 1 is provided with a plurality of address arrangement regions, and by arranging the wobble shapes of the grooves adjacent to the inner peripheral side and the grooves adjacent to the outer peripheral side of one address arrangement region on the land to be the same, it is made reproducible from the land while minimizing the influence on the recorded data due to the groove width variation.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

[0007] However, when the track pitch is narrowed for further high density, there is a problem that the crosstalk described above in reproduction interferes with the wobble signal in the address signal, and the reliability of detecting address information deteriorates.

[0008] The present disclosure provides an optical disk and an optical disk device that improve the reliability of detecting address information while maintaining access performance by making the detection frequencies of address information equal.

[0009] In order to solve the above problems, the optical disk of the present disclosure has an address information unit that is a unit for identifying a physical position. The address information unit has a plurality of address information bits, and has a plurality of arrangeable regions for each address information bit. The address information unit selects one of the regions to form address information, and a region unit is constituted by a plurality of address information units. The address information formed in the address information units included in the region unit is the same, and the regions selected in the address information units included in the region unit are configured to be different from each other.

[0010] In addition, the optical disc device of the present disclosure includes a region determination unit that determines a region to be detected, an address detection value storage unit that stores address detection values of a plurality of address information units included in units of regions respectively, a selection addition unit that selects, adds, and outputs the address detection values stored in the address detection value storage unit based on the region determined by the region determination unit, and an address information unit position determination unit that determines position information of an address information unit based on the output of the selection addition unit and the region determined by the region determination unit. It is provided with.

[0011] According to the optical disc and the optical disc device in the present disclosure, it is effective for reproducing highly reliable address information while maintaining access performance equivalent to the conventional one.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

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Figure 8

Embodiments for Carrying Out the Invention

[0013] (Embodiment) Hereinafter, an optical disc and an optical disc device in the embodiment will be described with reference to the drawings.

[0014] Figure 1 is a schematic diagram of an optical disc according to the present embodiment. As shown in Figure 1, a groove track 102 is formed in a spiral shape on the optical disc 101. A land track 103 is formed in a portion sandwiched by the spiral groove track 102, and both the groove track 102 and the land track 103 on the optical disc 101 are used as recording tracks. The groove track 102 and the land track 103 are each divided into a fixed angle for one round, and form an ADIP (ADress In Pre-Groove) 104 which is an address information unit for identifying the physical position on the optical disc 101. The ADIP 104 has a synchronization area 105 at the head portion, and an address information area 106 follows. This configuration is kept constant at the same angle radially from the inner circumference to the outer circumference of the optical disc 101.

[0015] Figure 2 is an enlarged view of a part of the recording surface of the optical disc 101. The groove track 102 is formed on the recording surface by transfer of a portion formed as a groove on a stamper during disc manufacturing, and is located at a position closer to the side irradiated with light. Also, when forming a groove on the stamper, in the disc manufacturing apparatus, it is formed with a constant beam intensity so that the groove width is also constant. The groove track 102 on the optical disc 101 formed by the transfer also has a substantially constant track width over the entire surface of the optical disc 101. Note that, during stamper manufacturing, there are also manufacturing methods with a large or small number of transfers, and in that case, the track width of the land track 103 is constant over the entire surface of the optical disc 101. For such an optical disc, the land track 103 and the groove track 102 of the present embodiment may be considered by swapping them all.

[0016] Also, as shown in FIG. 2, the groove track 102 and the land track 103 meander in a mostly constant cycle. This meandering is called wobbling. The wobbling is formed at a cycle shorter than the following reaction speed when the light spot 201 follows the groove track 102 or the land track 103. Therefore, a displacement occurs in the positional relationship between the light spot 201 and the groove track 102 or the land track 103, and by optically detecting the displacement and converting it into an electrical signal, the shape of the wobbling can be detected. The detection signal of the wobbling can be used to detect the track length and the linear velocity on the optical disc 101 by generating a clock synchronized with the detection signal, or can be used for recording sub-information by changing the shape of the wobbling. The optical disc in the present embodiment records address information by wobbling, although details will be described later. The groove track 102 always has a constant track width for convenience of disc manufacturing as described above, but the land track 103 sandwiched between the groove tracks 102 may have a varying track width depending on the phase of the wobbling of the adjacent inner circumferential side groove track and the outer circumferential side groove track.

[0017] Next, the details of the ADIP 104 will be described with reference to FIG. 3. FIG. 3 shows the groove tracks 102 of the ADIP 104 that are originally continuous and arranged side by side. The ADIP 104 is mostly composed of basic wobbles 302 having a common shape. The basic wobble 302 has a shape that is a function of cos(ωt), and has a shape that transitions between the maximum inner circumferential displacement, the maximum outer circumferential displacement, and the maximum inner circumferential displacement within one cycle. The portions other than the basic wobble 302 are also configured with one cycle of the basic wobble 302 as the minimum unit (hereinafter, this one cycle of the basic wobble 302 is referred to as the "wobble cycle"), and the ADIP unit 303 is composed of 80 wobble cycles.

[0018] The synchronization area 105 consists of eight ADIP units 303, where the MSK (Minimum Shift Keying) marks 301 are arranged at unequal intervals based on a predetermined rule, and the basic wobble 302 fills the spaces between them. The MSK marks 301 are formed by connecting one wobble period of each of the wobbles in the shapes of cos(1.5ωt), -cos(ωt), and -cos(1.5ωt). The center part has a waveform with a phase inverted from that of the basic wobble 302, and it is possible to detect the position of ADIP104 by performing phase detection of a predetermined arrangement. The MSK marks 301 are arranged so that high-precision positioning is possible by performing autocorrelation detection that adds the phase detection of the inverted phase at the arrangement intervals of the MSK marks 301.

[0019] In ADIP104, the wobble shapes of the parts other than the address information wobble 310 are the same in all ADIP104s of the optical disk 101, and since ADIP104s are arranged radially throughout from the inner circumference to the outer circumference as shown in FIG. 1, the wobble shapes other than the address information wobble are the same radially. Therefore, since the land tracks sandwiched between the groove tracks of the same shape also have the same shape, the synchronization area 105 has the same shape as the groove tracks even in the land tracks and can be detected in the same way as the groove tracks.

[0020] The address information area 106 is composed of 56 ADIP units 303. One bit of information is arranged in each ADIP unit 303, and 56 bits of address information, sub-information, and error correction information are arranged in ADIP104.

[0021] The address information wobble 310 is each ADIP unit 303 in the address information area 106, has 1-bit information, and has 56-bit information by 64 ADIP units as a whole in the address information area 106. This 56-bit information may be configured to have not only address information which is physical position information in the optical disc, but also auxiliary information such as layer information in a multilayer disc, information regarding conditions for recording on the optical disc, copyright information, etc., and error correction / detection codes for those information.

[0022] Next, the details of the address information wobble 310 will be described with reference to FIG. 4. The address information wobble 310 focuses on one ADIP unit 303 of the ADIP 104. FIG. 4 is a diagram showing a state in which the address information wobbles 310 are arranged in a radial method (from the inner circumference to the outer circumference direction of the disc), and represents the relationship with adjacent tracks. The address information wobbles 310 have different wobble shapes because adjacent tracks have different address information, but are arranged at the same angle radially.

[0023] The address information wobble 310 is configured based on the address information to be given to the land track, and four areas, area A 404, area B 405, area C 406, and area D 407, are provided as areas for arranging wobble patterns based on the address information. In FIG. 4, when focusing on the land track, in order from the inner circumference, a land track having address information "0" in area A 404, a land track having address information "1" in area B 405, a land track having address information "1" in area C 406, a land track having address information "0" in area D 407, a land track having address information "1" in area A 404, and a land track having address information "0" in area B 405 are shown. In any ADIP 104, an area for arranging address information among area A 404 to area D 407 is selected in advance for that ADIP 104, and address information is not arranged in different areas within the ADIP. That is, the area in which the address is arranged within the ADIP 104 is the same.

[0024] For example, in the ADIP104 where the area A404 is selected, assume that the pattern 402 of the address information "0" is arranged in the area A404 in order to arrange the address information "0". For this purpose, it is represented by arranging wobbles having the shapes of cos(1.25ωt), -sin(ωt) for 6 periods, and -cos(0.75ωt) in the adjacent groups on both sides. Also, when arranging the address information "1", the pattern 403 of the address information "1" is arranged. This is represented by arranging wobbles having the shapes of cos(0.75ωt), +sin(ωt) for 6 periods, and +cos(1.25ωt) in the adjacent groups on both sides. For the wobbles in the part where no address information is arranged, the basic pattern 401 is arranged. Looking at the 2nd to 7th wobble 6-period parts where the pattern 402 of the address information "0" and the pattern 403 of the address information "1" have their most characteristic shapes, the pattern 402 of the address information "0" has a phase difference of -90 degrees and the pattern 403 of the address information "1" has a phase difference of +90 degrees with respect to cos(ωt) which is the basic pattern 401 of the basic wobble 302. Note that the cosine function wobbles with 1.25 times and 0.75 times the period before and after the wobble having a 90-degree phase difference are arranged to connect to the 90-degree phase difference wobble with a gentle phase shift, and the phase difference with respect to the basic wobble is maintained at 90 degrees or less.

[0025] Furthermore, for the area selected in the ADIP104 of any land track, in the ADIP104 of the land adjacent to the inner circumference side, the area one after the areas A404, B405, C406, and D407 arranged in order is selected, and in the ADIP104 of the land adjacent to the outer circumference side, the area one before is selected. Since there are four areas where wobbles with address information are arranged in this way and the areas are configured to move one by one for each land track, the areas used in four consecutive land tracks are different. With such an arrangement, for any land area, the parts where both adjacent areas are wobbles with address information (pattern 402 of address information "0", pattern 403 of address information "1") can be configured to exist only outside the parts that actually have address information.

[0026] Figure 5 is a diagram for explaining the arrangement of ADIPs. In Figure 5, the arrangement of ADIP501 with area A selected, ADIP502 with area B selected, ADIP503 with area C selected, and ADIP504 with area D selected is shown. The optical disc 101 is arranged such that the areas for arranging the address information accompanying the movement of the ADIP104 move in order among four areas, such as area A - area B - area C - area D - area A - area B ···. By arranging in this way, the area selected by the subsequent ADIP104 can be easily inferred from the area selected by the preceding ADIP104. Also, by dividing one revolution into seven equal angles and regarding each as one ADIP104, the number of ADIPs in one revolution (= 7) is set to be one less than a multiple of the number of selectable areas (= 4), so that the areas arranged at the same angle change one by one for each revolution. That is, the number of areas moves one by one for each track. This configuration can be realized by setting the number of ADIPs in one revolution = a multiple of the number of selectable areas ± 1. Furthermore, to configure different areas to be selected for any three consecutive tracks of land, it can also be realized by setting the number of ADIPs in one revolution and the number of selectable areas to be relatively prime to each other.

[0027] Next, the address information recorded in ADIP104 and the arrangement of the areas where the address information is recorded will be described with reference to FIG. 6. FIG. 6 shows a configuration based on the address information to be given to the lands for simplification of the explanation. As shown in FIG. 4, the groove track is arranged in two areas, an inner peripheral land area and an outer peripheral land area.

[0028] FIG. 6 shows the lower 4 digits of the address information recorded in consecutive ADIP104s and the areas where they are arranged side by side. The seven ADIP104s arranged horizontally represent one round of the optical disc. The areas where the address information is arranged are arranged in the order of A·B·C·D·A·B··· as described above (A follows D), and the four ADIP104s arranged in A, B, C, and D are taken as the area unit 601. The areas where the ADIP104s included in the area unit 601 are arranged are different from each other. The same address information is recorded in the area unit 601, and including the error correction code, the arrangement of "0" and "1" of the address information is exactly the same, and only the arranged areas are different. That is, the shape of the wobble pattern recording the address information is the same for each bit. By adding or averaging the detection values of the wobble pattern within the area unit 601, the detection SNR (Signal Noise Ratio) is improved and the reliability of address information reproduction is improved. In addition, since the area where each ADIP104 is arranged is recognized in advance and the address information is detected for that area, the current position of the ADIP104 in the area unit 601 is also recognized. Therefore, the current position on the disc can be specified for each ADIP104, and the position of the ADIP104 on the entire optical disc 101 can be specified. Thus, the detection frequency and access performance of the address information for each ADIP104 can be realized. In addition, in the optical disc in the present embodiment, the number of areas included in the area unit and the number of areas where the address information can be arranged are the same, but the same effect can be exhibited if it is a divisor of 2 or more.

[0029] Next, the optical disc apparatus 700 in the present embodiment will be described.

[0030] FIG. 7 is a block diagram of the optical disk drive 700 according to the present embodiment, and its configuration and operation will be described below.

[0031] The optical disk drive 700 includes an optical head 701, a servo control unit 702, a signal generation unit 703, a wobble processing unit 704, an address timing generation unit 705, a reproduction processing unit 706, a decoder 707, an encoder 708, a recording processing unit 709, a laser drive unit 710, and a controller 711.

[0032] When the optical disk 101 is inserted into the optical disk drive 700, a light beam is irradiated from the optical head 701 onto the optical disk 101, and the light beam reflected by the optical disk 101 is photoelectrically converted by a photodetector (not shown) that is divided into four in the tangential direction (track groove direction) and the radial direction (radial direction) included in the optical head 701, and the information on the amount of reflected light is converted into a voltage level. The voltage information output from this four-divided photodetector is used by the signal generation unit 703 to generate a focus error signal, a tracking error signal, a wobble signal, and a total addition signal, respectively. Here, the total addition signal is a signal obtained by adding all four-divided photodetectors and indicates the amount of reflected light of the optical disk itself. The focus error signal is a signal detected by, for example, the astigmatism method, and is a signal obtained by adding two sets of signals of the four-divided photodetectors arranged diagonally and finding the difference therebetween. The tracking error signal and the wobble signal are signals detected by the push-pull method, and are signals obtained by adding two sets of four-divided photodetectors arranged in the tangential direction and finding the difference therebetween. The tracking error signal is generated by extracting a frequency component from 0 Hz to several tens of kHz with respect to the push-pull signal, and the wobble signal is generated by extracting a signal component from several tens of kHz to several MHz with respect to the push-pull signal.

[0033] The servo control unit 702 drives the objective lens up and down so that the focus error signal becomes zero, thereby condensing the light spot on the recording surface. Further, by driving the objective lens in the radial direction so that the tracking error signal becomes zero, the light spot is tracked on the land or the groove. Whether to track on the land or the groove is determined according to the tracking error, and whether to drive to the outer peripheral side or the inner peripheral side. This driving polarity is determined according to the instruction from the controller 711.

[0034] The wobble processing unit 704 processes the wobble signal generated by the signal generation unit 703, and generates a wobble clock obtained by multiplying the reproduction signal of the basic wobble 302 part of the wobble signal, detects the ADIP synchronization, and reproduces the address information. The address timing generation unit 705 generates the timing of the reproduction process and outputs it to the reproduction processing unit 706, and generates the timing of the recording process and outputs it to the recording processing unit 709 for the target address instructed by the controller 711 from the various signals generated by the wobble processing unit 704.

[0035] Regarding the reproduction of user data, the reproduction processing unit 706 extracts binary data from the total addition signal generated by the signal generation unit 703 according to the timing of the reproduction target address generated by the address timing generation unit 705. The decoder 707 demodulates and corrects the error of the binary data and outputs it as reproduction data. Regarding the recording of user data, the encoder 708 receives the recording data, adds an error correction code, and modulates it into binary data. The recording processing unit 709 issues a light emission command for the recording power to the laser drive unit 710 according to the timing of the recording target address generated by the address timing generation unit 705.

[0036] Next, with reference to FIG. 8, the most characteristic wobble processing unit 704 in the optical disc apparatus 700 of the present embodiment will be described in detail.

[0037] The wobble processing unit 704 is composed of an ADIP synchronization detection unit 801, a timing generation unit 802, a first integrator 803, a second integrator 804, a third integrator 805, a fourth integrator 806, a region detection unit 807, a detected region determination unit 808, a wobble PLL 809, a multiplier 810, an absolute value detector 811, an integrator 812, a region A address detection value storage unit 813, a region B address detection value storage unit 814, a region C address detection value storage unit 815, a region D address detection value storage unit 816, a selection adder 817, a decoder 818, and an ADIP positioning unit 819.

[0038] When a wobble signal is input, the wobble processing unit 704 causes the wobble PLL 809 to generate a wobble clock obtained by multiplying the reproduction signal from the basic wobble 302, and at the same time, generates a 90-degree phase waveform whose phase is shifted by +90 degrees at the same frequency as the basic wobble 302. In the optical disk apparatus 700 of the present embodiment, as shown in FIG. 8, the 90-degree phase waveform is a sine wave, but since waveforms such as a rectangular wave and a triangular wave can also realize substantially the same function, those waveforms may be selected for circuit simplification. The multiplier 810 multiplies and outputs the 90-degree phase waveform generated by the wobble PLL 809 and the wobble signal. The absolute value detector 811 outputs the absolute value of the output of the multiplier 810.

[0039] On the one hand, the ADIP synchronization detection unit 801 generates an ADIP synchronization signal synchronized with ADIP by searching for the signal in the synchronization area 105 on the optical disc 101 from the wobble signal. The timing generation unit 802 generates a timing signal from area A404 to area D407 by counting a certain number of wobble clocks generated by the wobble PLL 809 based on the ADIP synchronization signal detected by the ADIP synchronization detection unit 801. This timing signal is output for all address information wobbles 310 in the ADIP 104. The first integrator 803 to the fourth integrator 806 are reset at the boundary of the ADIP 104, and integrate and output the output signal of the absolute value detector 811 with respect to the timing from area A404 to area D407 generated by the timing generation unit 802. The area detection unit 807 outputs which integrator has the maximum output among the outputs of the first integrator 803 to the fourth integrator 806 when the current tracking is a land track. When the current tracking is a groove track, the area detection unit 807 outputs which two consecutive integrators (assuming that the fourth to the first are consecutive) among the first integrator 803 to the fourth integrator 806 have the maximum output. Since this area detection process is performed on the result of the integration process for the entire ADIP, the search for the area where the address information is recorded can be performed with high reliability.

[0040] The detection area determination unit 808 determines the area based on the output of the area detection unit 807 at the boundary of consecutive ADIPs 104. When the output of the area detection unit 807 in the ADIP 104 preceding at the ADIP boundary timing is area A, the detection area determination unit 808 selects area B because it can be inferred that the subsequent ADIP is area B. Similarly, if the preceding ADIP is area B, the subsequent ADIP selects area C; if the preceding ADIP is area C, the subsequent ADIP selects area D; if the preceding ADIP is area D, the subsequent ADIP selects area A.

[0041] Integrator 812 integrates and outputs the output signal of multiplier 810 with respect to the timing of the region selected by detection region determination unit 808. The operation by the configurations of this multiplier 810 and integrator 812 is a common one as a means of phase detection. The integration process is reset at the head of address information wobble 310 and is carried out for each address information wobble 310.

[0042] Region A address detection value storage unit 813, region B address detection value storage unit 814, region C address detection value storage unit 815, and region D address detection value storage unit 816 store the output of integrator 812 with respect to the timings of regions A to D generated by timing generation unit 802. Since ADIP104 has 56-bit information, detection values for 56 bits each are stored.

[0043] When detection region determination unit 808 selects region A, selection adder 817 outputs the output of region A address detection value storage unit 813. When detection region determination unit 808 selects region B, selection adder 817 outputs the added value of the output of region A address detection value storage unit 813 and the output of region B address detection value storage unit 814. When detection region determination unit 808 selects region C, selection adder 817 outputs the added value of the output of region A address detection value storage unit 813, the output of region B address detection value storage unit 814, and the output of region C address detection value storage unit 815. When detection region determination unit 808 selects region D, selection adder 817 outputs the added value of the output of region A address detection value storage unit 813, the output of region B address detection value storage unit 814, the output of region C address detection value storage unit 815, and the output of region D address detection value storage unit 816.

[0044] The decoding unit 818 determines the positive / negative of the output of the selection addition unit 817 bit by bit at the end of the address information area 106 and performs error correction. The ADIP positioning unit 819 determines the position information for each ADIP 104 based on the output result of the decoding unit 818, that is, the address information for each area unit 601, and the area selected by the detection area determination unit 808. When the detection area determination unit 808 selects area A, the ADIP position information is determined as the address information recorded in the area unit 601 × 4. When the detection area determination unit 808 selects area B, the ADIP position information is determined as the address information recorded in the area unit 601 × 4 + 1. When the detection area determination unit 808 selects area C, the ADIP position information is determined as the address information recorded in the area unit 601 × 4 + 2. When the detection area determination unit 808 selects area D, the ADIP position information is determined as the address information recorded in the area unit 601 × 4 + 3.

[0045] In the optical disc 101 and the optical disc device 700 according to the present embodiment, the number of ADIPs 104 included in each area unit is set to 4. However, by setting it to 2 to the power of n (n is a natural number), the calculation of the ADIP address from the address information recorded in each area unit can be achieved by bit shift using binary numbers, and it can be realized with a simple configuration.

[0046] With such a configuration, among the four ADIP104s in the area unit 601, at the end of the first ADIP, address detection is performed using only the detection value of area A. At the end of the second ADIP, address detection is performed using the sum of the detection values of area A and area B. At the end of the third ADIP, address detection is performed using the sum of the detection values of area A, area B, and area C. At the end of the fourth ADIP, that is, at the end of the area unit 601, address detection is performed using the sum of all detection values from area A to area D. By doing so, it is possible to improve the reliability of address detection by adding the detection values of ADIP104s having the same address information. Also, by using the area where the address information is arranged at the same time, it is possible to recognize which ADIP104 in the area unit 601 is being reproduced, so that the position of each ADIP104 can be specified, and both improvement in reliability and access performance can be achieved.

[0047] Note that, among the ADIP104s included in the same area unit 601, equivalent effects can be expected by adding the detection values of any plurality of ADIPs. Also, in the optical disk device of the present embodiment, the detection values of each area are selected and added. However, it may be configured such that the detection values of all the detection value storage units are set to 0 at the beginning of the area unit, and the detection values are stored when the address of each area is reproduced, so that the detection values from area A to area D are always added together.

[0048] As described above, according to the optical disk and the optical disk device in the present embodiment, by forming the same address information in a plurality of address information units arranged in different areas, it is possible to provide an optical disk device having highly reliable address information reproduction and access performance. Note that the configuration of the optical disk device according to the present disclosure may be realized by a processor and a memory.

Industrial Applicability

[0049] The present disclosure is applicable to representing a physical address with respect to a track groove and its recording and reproducing apparatus. Specifically, it is applicable to an optical disc, an optical tape, and its recording and reproducing apparatus, etc.

Explanation of Signs

[0050] 101 Optical disc 102 Groove track 103 Land track 104 ADIP 105 Synchronization area 106 Address information area 201 Optical spot 302 Basic wobble 301 MSK mark 310 Address information wobble 404 Area A 405 Area B 406 Area C 407 Area D 401 Basic pattern 402 Pattern of address information “0” 403 Pattern of address information “1” 501 ADIP with area A selected 502 ADIP with area B selected 503 ADIP with area C selected 504 ADIP with area D selected 601 Area unit 700 Optical disc device 701 Optical head 702 Servo control unit 703 Signal generation unit 704 Wobble processing unit 705 Address timing generation unit 706 Reproduction processing unit 707 Decoder 708 Encoder 709 Recording processing unit 710 Laser drive unit 711 Controller 801 ADIP synchronization detection unit 802 Timing generation unit 803 First integrator 804 Second integrator 805 Third integrator 806 Fourth integrator 807 Region detection unit 808 Detected region determination unit 809 Wobble PLL 810 Multiplier 811 Absolute value detector 812 Integrator 813 Region A address detection value storage unit 814 Region B address detection value storage unit 815 Region C address detection value storage unit 816 Region D address detection value storage unit 817 Selection adder 818 Decoder 819 ADIP positioning unit

Claims

1. It has an address information unit for identifying a physical position on an optical disc, The address information unit has a plurality of address information bits, and has a plurality of arrangeable areas for each of the address information bits, In the address information unit, one of the plurality of arrangeable areas is selected and address information is formed, A plurality of the address information units constitute a region unit, The address information formed in the plurality of address information units included in the region unit is the same, The shape of the wobble pattern recording the address information formed in the plurality of address information units included in the region unit is the same for each bit, An optical disc, characterized in that a plurality of regions selected by the plurality of address information units included in the region unit are different from each other.

2. An optical disc apparatus for recording and reproducing on an optical disc, The optical disc, has an address information unit for identifying a physical position on the optical disc, The address information unit has a plurality of address information bits, and has a plurality of arrangeable areas for each of the address information bits, In the address information unit, one of the plurality of arrangeable areas is selected and address information is formed, A plurality of the address information units constitute a region unit, The address information formed in the plurality of address information units included in the region unit is the same, A plurality of regions selected by the plurality of address information units included in the region unit are different from each other, The optical disc apparatus, includes a detection region determination unit for determining the plurality of regions to be detected, an address detection value storage unit for storing respectively a plurality of address detection values of the plurality of address information units included in the region unit, a selection addition unit for selecting and adding the plurality of address detection values stored in the address detection value storage unit based on the plurality of regions determined by the detection region determination unit and outputting a total value, and an address information unit position determination unit for determining the physical position of the address information unit based on the total value output by the selection addition unit and the plurality of regions determined by the detection region determination unit.

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