WO2022172492A1

WO2022172492A1 - Optical disk and optical disk device

Info

Publication number: WO2022172492A1
Application number: PCT/JP2021/030840
Authority: WO
Inventors: 順一南野
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2021-02-12
Filing date: 2021-08-23
Publication date: 2022-08-18
Also published as: TW202238570A; JPWO2022172492A1; CN116762129A

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

Optical disks and optical drives

The present disclosure relates to an optically recordable optical disc, and a playback device and recording device for the optical disc.

In recent years, the recording density of optical discs has been steadily increasing. Optical discs such as DVDs and BDs (Blu-ray (registered trademark) Discs) are well known in the video field. These optical discs are used not only for video recording, but also as external recording media for personal computers. Hard disks, flash memories, and the like are also used as external recording media for personal computers, but optical disks have the advantages of longer life, higher reliability, and no need for storage power than these media. Focusing on these advantages, it is attracting attention as an important data archive medium for data centers and the like. Under such circumstances, the 300 GB Archival Disc is currently the largest capacity optical disc, but there is a demand for even higher density.

As a method for increasing the density of optical discs, there is an improvement in radial density by narrowing the track pitch. However, narrowing the track pitch also causes a problem that crosstalk, which is interference between recorded signals on adjacent tracks, increases during reproduction of recorded data.

On the other hand, optical discs have physical addresses to specify where user data is recorded and played back. One method of forming a physical address is a wobble address based on meandering tracks (hereinafter referred to as wobble). The recording of physical addresses by wobble has the advantage that the recording capacity does not decrease because a signal can be detected by a detection method different from that for recording and reproducing user data, and is widely used in BDs and the like.

Patent Document 1 discloses an address notation method using wobbles that can be reproduced from both land and groove tracks in a land-groove recording disc. The optical disc disclosed in Patent Document 1 is provided with a plurality of address arrangement areas, and the wobble shape of the groove adjacent to the inner circumference side and the groove adjacent to the outer circumference side of one address arrangement area on the land is the same. By arranging them, it is possible to reproduce data from the land, while minimizing the influence of groove width fluctuations on recorded data.

WO2014/192292

However, if the track pitch is narrowed to achieve a higher density, the above-mentioned crosstalk in the reproduction of the address signal also interferes with the wobble signal, resulting in a problem that the reliability of address information detection deteriorates.

The present disclosure provides an optical disk and an optical disk device that improve the reliability of address information detection while maintaining access performance by equalizing the detection frequency of address information.

In order to solve the above problems, the optical disc 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 a plurality of arrangement for each address information bit. address information is formed by selecting any one of the areas, the area unit is composed of a plurality of address information units, and the address information units included in the area unit are formed. The address information is the same, and the areas selected by the address information unit included in the area unit are configured to be different from each other.

Further, the optical disk device of the present disclosure includes an area determination unit that determines an area to be detected, an address detection value storage unit that stores address detection values of a plurality of address information units included in each area, and an area determination unit. a selective adder that selects, adds, and outputs the detected address values stored in the detected address value storage unit based on the determined area; an address information unit position determination unit that determines information;
It has

According to the optical disk and optical disk device of the present disclosure, it is effective in reproducing highly reliable address information while maintaining the same access performance as the conventional one.

Schematic diagram of an optical disc in an embodiment Enlarged view of the recording surface of the optical disc in the embodiment A diagram for explaining the structure of an address information unit (ADIP) of an optical disc in an embodiment. FIG. 4 is a diagram for explaining the shape of wobbles having address information according to the embodiment; FIG. 4 is a diagram for explaining the arrangement of ADIPs according to the embodiment; FIG. 4 is a diagram for explaining the arrangement of continuous ADIP address information and areas to be allocated according to the embodiment; Block diagram of an optical disc device according to an embodiment FIG. 4 is a diagram for explaining the configuration and operation of the wobble processing section in the embodiment;

(Embodiment)
An optical disc and an optical disc apparatus according to embodiments will be described below with reference to the drawings.

FIG. 1 is a schematic diagram of an optical disc according to this embodiment. As shown in FIG. 1, an optical disc 101 has a groove track 102 formed in a spiral shape. A land track 103 is formed in a portion sandwiched between groove tracks 102 forming a spiral shape, and the land track 103 is used as a recording track along with the groove track 102 of the optical disk 101 . The groove track 102 and the land track 103 are divided at a constant angle to form an ADIP (Address In Pre-Groove) 104 which is an address information unit for identifying a physical position on the optical disc 101 . The ADIP 104 has a synchronous area 105 at the beginning and is followed by an address information area 106 . This configuration is maintained at the same radial angle from the inner circumference to the outer circumference of the optical disk 101 .

FIG. 2 is an enlarged view of a part of the recording surface of the optical disk 101. FIG. The groove track 102 is formed on the recording surface by transfer of the portion formed as a groove on the stamper during disc manufacture, and is located near the side irradiated with light. Further, when grooves are formed on the stamper, the disk manufacturing apparatus forms grooves with a constant beam intensity, so that the width of the grooves 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 . In manufacturing the stamper, there is a manufacturing method in which the number of times of transfer is large or small. In the case of such an optical disc, the land tracks 103 and the groove tracks 102 of this embodiment may be exchanged.

Also, the groove track 102 and the land track 103 mostly meander at a constant cycle as shown in FIG. This meandering is called wobble. When the light spot 201 follows the groove track 102 or the land track 103, the wobble is formed with a period shorter than the reaction speed of the track. Therefore, the positional relationship between the light spot 201 and the groove track 102 or land track 103 is displaced, and by optically detecting the displacement and converting it into an electrical signal, the shape of the wobble can be detected. The wobble detection signal can be used to detect the track length and linear velocity of the optical disk 101 by generating a clock synchronized with the detection signal, or can be used for recording sub-information by changing the shape of the wobble. can be done. The optical disk in the present embodiment records address information by wobble, which will be described in detail later. As described above, the groove tracks 102 have a constant track width for the convenience of disc manufacturing. The track width may vary depending on the phase.

Next, the details of the ADIP 104 will be explained using FIG. In FIG. 3, the groove track 102 of the ADIP 104, which is originally continuous, is divided and arranged. The ADIP 104 consists of a basic wobble 302 of mostly common shape. The basic wobble 302 has a shape that is a function of cos(ωt), and has a shape that changes from maximum inner circumference displacement, maximum outer circumference displacement, and maximum inner circumference displacement within one cycle. A portion other than the basic wobble 302 is also configured with one cycle of the basic wobble 302 as the minimum unit (hereinafter, one cycle of the basic wobble 302 is referred to as a "wobble cycle"), and the ADIP unit 303 is configured with 80 wobble cycles. there is

The synchronization area 105 consists of 8 ADIP units 303, MSK (Minimum Shift Keying) marks 301 are arranged at irregular intervals based on a predetermined rule, and basic wobbles 302 fill the gaps. The MSK mark 301 is formed by connecting one wobble period each of wobbles having the shapes of cos(1.5ωt), −cos(ωt), and −cos(1.5ωt), and the central portion is out of phase with the basic wobble 302. The waveform is inverted, and the position of the ADIP 104 can be detected by detecting the phase of a predetermined arrangement. The MSK marks 301 are arranged so as to enable highly accurate positioning by performing autocorrelation detection in which the phase detection of the inverted phase is added at the arrangement intervals of the MSK marks 301 .

In the ADIP 104, the wobble shape of the portion other than the address information wobble 310 is the same in all the ADIPs 104 of the optical disk 101, and the ADIP 104 is radially arranged in any portion from the inner circumference to the outer circumference as shown in FIG. , the wobble shapes other than the address information wobble are radially identical. Therefore, since land tracks sandwiched between groove tracks having 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 manner as the groove tracks.

The address information area 106 is composed of 56 ADIP units 303 . Each ADIP unit 303 has 1-bit information, and the ADIP 104 has 56-bit address information, sub-information, and error correction information.

The address information wobble 310 is each ADIP unit 303 in the address information area 106 and has 1-bit information, and the address information area 106 as a whole has 56-bit information with 64 ADIP units. This 56-bit information includes not only address information, which is physical position information in the optical disk, but also sub-information such as layer information in the multilayer disk, information on the conditions for recording on the optical disk, copyright information, etc. It may be configured to have an error correction/error detection code for the information.

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

The address information wobble 310 is configured based on address information to be given to the land track, and four areas of 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. ing. In FIG. 4, focusing on the land tracks, in order from the inner circumference, a land track having address information "0" in area A404, a land track having address information "1" in area B405, and an address information "1" in area C406. A land track having address information "0" in area D407, a land track having address information "1" in area A404, and a land track having address information "0" in area B405. Within an arbitrary ADIP 104, an area in which address information is to be placed is selected in advance from areas A404 to D407 in that ADIP 104, and address information is not placed in different areas within the ADIP. In other words, the areas in which the addresses are arranged in the ADIP 104 are the same.

For example, in the ADIP 104 in which the area A404 is selected, the pattern 402 of the address information "0" is arranged in the area A404 in order to arrange the address information "0". Therefore, it is represented by arranging wobbles having six periods of cos (1.25ωt) and -sin (ωt) and a shape of -cos (0.75ωt) in the adjacent grooves. When the address information "1" is arranged, the pattern 403 of the address information "1" is arranged. This is expressed by arranging wobbles having six cycles of cos (0.75ωt), +sin (ωt), and a shape of +cos (1.25ωt) in adjacent grooves. A basic pattern 401 is arranged in the wobble in the portion where the address information is not arranged. The pattern 402 of address information "0" and the pattern 403 of address information "1" have the most characteristic shape. ωt), the pattern 402 of address information “0” has a phase difference of −90 degrees, and the pattern 403 of address information “1” has a phase difference of +90 degrees. The cos function wobbles with periods of 1.25 times and 0.75 times before and after the wobble with a phase difference of 90 degrees are arranged to connect to the wobble with a phase difference of 90 degrees with a gentle phase shift. The phase difference is maintained at 90 degrees or less with respect to the basic wobble.

Further, in the ADIP 104 of the land adjacent to the inner peripheral side of the ADIP 104 selected in the ADIP 104 of an arbitrary land track, the area A 404, the area B 405, the area C 406, and the area D 407 are arranged in this order. An area is selected, and the previous area is selected for the ADIP 104 of the adjacent land on the outer peripheral side. As described above, there are four areas where wobbles having address information are arranged, and the area is moved one by one for each land track. Therefore, the areas used in all four consecutive land tracks are different. With such an arrangement, no matter which land area is focused on, the portion where both adjacent wobbles have address information (pattern 402 with address information "0" and pattern 403 with address information "1") is actually It can be configured such that it does not exist except for the part having the address information.

FIG. 5 is a diagram for explaining the arrangement of ADIPs. FIG. 5 shows the arrangement of ADIP 501 with area A selected, ADIP 502 with area B selected, ADIP 503 with area C selected, and ADIP 504 with area D selected. The optical disk 101 sequentially moves four areas in which the address information is arranged as the ADIP 104 moves, such as area A, area B, area C, area D, area A, area B, and so on. It is arranged. By arranging in this way, the region selected by the subsequent ADIP 104 can be easily analogized from the region selected by the preceding ADIP 104 . In addition, one round is divided into seven at a constant angle to form one ADIP 104, and the number of ADIPs for one round (=7) is a multiple of the number of selectable regions (=4) minus 1, so that the same angle is obtained for each round. are arranged to change one by one. In other words, the number of areas is moved one by one for each track. This configuration can be realized by setting the number of ADIPs for one round=the multiple of the number of selectable regions±1. Furthermore, in order to have a configuration in which different areas are selected in arbitrary three consecutive tracks of land, it is also possible to set the number of ADIPs for one round and the number of selectable areas to be relatively prime. can.

Next, the address information recorded in the ADIP 104 and the arrangement of areas in which the address information is recorded will be described with reference to FIG. FIG. 6 shows a configuration based on address information to be given to lands for simplification of explanation. As shown in FIG. 4, the groove tracks are arranged in two areas, the land area on the inner circumference side and the land area on the outer circumference side.

FIG. 6 also shows the lower four digits of the address information recorded in the continuous ADIP 104 and the areas where they are arranged. Seven ADIPs 104 arranged horizontally represent one round of the optical disc. The areas where the address information is arranged are arranged in order like A, B, C, D, A, B, . . . , D are defined as an area unit 601, and the areas in which the ADIPs 104 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 the arrangement of "0" and "1" of the address information including the error correction code are all the same, and only the areas in which they are arranged are different. In other words, the shape of the wobble pattern recording the address information is the same for each bit, and 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 address Reliability of information reproduction is improved. In addition, since the area arranged in each ADIP 104 is recognized in advance and the address information is detected for that area, the current position of the ADIP 104 in the area unit 601 is also recognized. Since it is possible to specify the current position on the top and to specify the position of the ADIP 104 in the entire optical disc 101, the detection frequency and access performance of the address information for each ADIP 104 can be realized. Also, in the optical disk of the present embodiment, the number of areas included in each area unit is the same as the number of areas in which address information can be arranged.

Next, the optical disk device 700 according to this embodiment will be described.

FIG. 7 is a block diagram of an optical disk device 700 according to this embodiment, and the configuration and operation thereof will be described below.

The optical disc apparatus 700 includes an optical head 701 , a servo control section 702 , a signal generation section 703 , a wobble processing section 704 , an address timing generation section 705 , a reproduction processing section 706 , a decoder 707 , an encoder 708 , a recording processing section 709 and a laser driving section 710 . , a controller 711 .

When the optical disc 101 is inserted into the optical disc apparatus 700, the optical head 701 irradiates the optical disc 101 with a light beam, and the light beam reflected by the optical disc 101 is directed in the track groove direction (tangential direction) and the direction in which the optical head 701 includes the light beam. A photodetector (not shown) divided into four in the radial direction performs photoelectric conversion to convert information on the amount of reflected light into a voltage level. The signal generator 703 generates a focus error signal, a tracking error signal, a wobble signal, and a total addition signal from the voltage information output from the four-part split photodetector. Here, the total sum signal is a signal obtained by adding all four-division photodetectors, and is a signal that indicates the amount of reflected light from the optical disk itself. The focus error signal is a signal detected by, for example, an astigmatism method, and is a signal obtained by adding two sets of signals from four-division photodetectors arranged diagonally and finding the difference between them. 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-division photodetectors arranged in the tangential direction and finding the difference between them. The tracking error signal is generated by extracting frequency components from 0 Hz to several tens of kHz from the push-pull signal, and the wobble signal is generated by extracting signal components from several tens of kHz to several MHz from the push-pull signal.

The servo control unit 702 vertically drives the objective lens so that the focus error signal becomes zero, thereby converging the light spot on the recording surface, and furthermore, moves the objective lens in the radial direction so that the tracking error signal becomes zero. to track the light spot to a land or groove. Whether to track to the land or the groove is determined according to the tracking error, depending on whether to drive toward the outer circumference or toward the outer circumference. This drive polarity is determined according to an instruction from the controller 711 .

A wobble processing unit 704 processes the wobble signal generated by the signal generation unit 703, generates a wobble clock by multiplying the reproduction signal of the basic wobble 302 portion of the wobble signal, detects ADIP synchronization, and reproduces address information. conduct. The address timing generation unit 705 generates reproduction processing timing for the target address instructed by the controller 711 from various signals generated by the wobble processing unit 704, and outputs the reproduction processing timing to the reproduction processing unit 706. is generated and output to the recording processing unit 709 .

Regarding 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, and the decoder 707 extracts the binary data. Data is demodulated, error corrected, and output as reproduced data. Regarding the recording of user data, the encoder 708 receives recording data, adds an error correction code, and modulates it into binary data. A light emission command for recording power is issued to the laser driving unit 710 .

Next, the most characteristic wobble processing unit 704 in the optical disk device 700 of this embodiment will be described in detail with reference to FIG.

The wobble processor 704 includes an ADIP synchronization detector 801, a timing generator 802, a first integrator 803, a second integrator 804, a third integrator 805, a fourth integrator 806, an area detector 807, detection area determination unit 808, wobble PLL 809, multiplier 810, absolute value detector 811, integrator 812, area A address detection value storage unit 813, area B address detection value storage unit 814, area C address detection value storage unit 815, It is composed of an area D address detection value storage unit 816 , a selection addition unit 817 , a decoding unit 818 and an ADIP position determination unit 819 .

When the wobble signal is input to the wobble processing unit 704, the wobble PLL 809 multiplies the reproduction signal from the basic wobble 302 to generate a wobble clock. Generates a degree-phase waveform. In the optical disk apparatus 700 of the present embodiment, the 90-degree phase waveform is sinusoidal as shown in FIG. Those waveforms may be chosen for simplicity. A multiplier 810 multiplies the 90-degree phase waveform generated by the wobble PLL 809 and the wobble signal, and outputs the result. Absolute value detector 811 outputs the absolute value of the output of multiplier 810 .

On the other hand, the ADIP synchronization detection unit 801 generates an ADIP synchronization signal synchronized with ADIP by searching the signal of the synchronization area 105 on the optical disk 101 from the wobble signal. The timing generator 802 counts the wobble clock generated by the wobble PLL 809 based on the ADIP synchronization signal detected by the ADIP synchronization detector 801, thereby generating timing signals for the areas A404 to D407. This timing signal is output for all address information wobbles 310 in ADIP 104 . The first integrator 803 to the fourth integrator 806 are reset at the boundary of the ADIP 104, and integrate the output signal of the absolute value detector 811 with respect to the timing of the area A404 to area D407 generated by the timing generator 802. Output. When the current tracking is land track, area detection section 807 outputs which of the outputs of first integrator 803 to fourth integrator 806 has the maximum output. If the current tracking is a groove track, any two of the first integrator 803 to the fourth integrator 806 (the fourth to the first are assumed to be consecutive) Output whether it is the maximum. Since this area detection process is performed on the result of integrating the entire ADIP, the area in which the address information is recorded can be searched with high reliability.

A detection area determination unit 808 determines an area based on the output of the area detection unit 807 at the boundary of continuous ADIPs 104 . When the output of the area detection unit 807 in the preceding ADIP 104 at the ADIP boundary timing is the area A, the detection area determination unit 808 selects the area B because the following ADIP is assumed to be the area B by analogy. 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, and if the preceding ADIP is area D, the subsequent ADIP selects area A. .

The integrator 812 integrates and outputs the output signal of the multiplier 810 with respect to the timing of the area selected by the detection area determination section 808 . The operation of the configuration of multiplier 810 and integrator 812 is common as phase detection means. The integration process is reset at the beginning of the address information wobble 310 and performed for each address information wobble 310 .

An area A address detection value storage unit 813, an area B address detection value storage unit 814, an area C address detection value storage unit 815, and an area D address detection value storage unit 816 generate timings for areas A to D generated by the timing generation unit 802. Save the output of the integrator 812 against . Since the ADIP 104 has 56-bit information, each detected value of 56 bits is stored.

The selection addition unit 817 outputs the output of the area A address detection value storage unit 813 when the detection area determination unit 808 selects the area A. When the detection area determination unit 808 selects the area B, the addition value of the output of the area A address detection value storage unit 813 and the output of the area B address detection value storage unit 814 is output. When the detection area determination unit 808 selects the area C, the output of the area A address detection value storage unit 813, the addition value of the output of the area B address detection value storage unit 814 and the output of the area C address detection value storage unit 815 to output When the detection area determination unit 808 selects the area D, the output of the area A address detection value storage unit 813, the output of the area B address detection value storage unit 814, the output of the area C address detection value storage unit 815 and the area D The added value of the output of the address detection value storage unit 816 is output.

At the end of the address information area 106, the decoding unit 818 determines whether the output of the selective addition unit 817 is positive or negative for each bit, and corrects the error. An ADIP position determining unit 819 determines position information for each ADIP 104 based on the output result of the decoding unit 818, that is, address information for each area unit 601 and the area selected by the detection area determining unit 808. FIG. When the detection area determination unit 808 selects the 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 the 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 the area C, the ADIP position information is determined as the address information recorded in the area unit 601×4+2. When the detection area determining unit 808 selects the area D, the ADIP position information is determined as the address information recorded in the area unit 601×4+3.

In the optical disc 101 and the optical disc apparatus 700 of the present embodiment, the number of ADIPs 104 included in each area is four. Calculation of the ADIP address can be performed by bit shift in binary numbers, and can be realized with a simple configuration.

With such a configuration, of the four ADIPs 104 in the area unit 601, at the end of the first ADIP, address detection is performed using only the detection value of area A, and at the end of the second ADIP, area A and area A are detected. Address detection is performed using the added value of the detected value of B, and at the end of the third ADIP, address detection is performed using the added value of the detected values of area A, area B, and area C, and the address is detected using the added value of the detection values of area A, area B, and area C. At the end, that is, the end of the area unit 601, the sum of the detection values of all areas A to D is used to detect the address. By doing so, it is possible to improve reliability by address detection by adding detection values of ADIPs 104 having the same address information. In addition, since it is possible to recognize which ADIP 104 is being reproduced in the area unit 601 by simultaneously using the area where the address information is arranged, it becomes possible to specify the position of each ADIP 104, and both reliability improvement and access performance are achieved. can be realized.

The same effect can be expected by adding the detection values of arbitrary plural ADIPs among the ADIPs 104 included in the same area unit 601 . Further, the optical disk apparatus of the present embodiment is configured to select and add the detection values of each area. A configuration may be employed in which the detected values are stored so that the detected values of the regions A to D are always added.

As described above, according to the optical disk and the optical disk device of the present embodiment, by forming the same address information for each of a plurality of address information units arranged in different areas, it is possible to reproduce the address information with high reliability. It is possible to provide an optical disk device with good access performance. Note that the configuration of the optical disc device according to the present disclosure may be realized by a processor and memory.

The present disclosure is applicable to notating physical addresses for track grooves and recording/reproducing devices thereof. Specifically, the present invention can be applied to optical discs, optical tapes, recording/reproducing devices thereof, and the like.

101 optical disc 102 groove track 103 land track 104 ADIP
105 synchronization area 106 address information area 201 light 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 region B selected
503 ADIP with region C selected
504 ADIP with region D selected
601 Area Unit 700 Optical Disk Device 701 Optical Head 702 Servo Control Section 703 Signal Generation Section 704 Wobble Processing Section 705 Address Timing Generation Section 706 Reproduction Processing Section 707 Decoder 708 Encoder 709 Recording Processing Section 710 Laser Driving Section 711 Controller 801 ADIP Synchronization Detection Section 802 Timing generator 803 First integrator 804 Second integrator 805 Third integrator 806 Fourth integrator 807 Area detector 808 Detection area determiner 809 Wobble PLL
810 multiplier 811 absolute value detector 812 integrator 813 area A address detected value storage section 814 area B address detected value storage section 815 area C address detected value storage section 816 area D address detected value storage section 817 selective addition section 818 decoding section 819 ADIP Position Determiner

Claims

having an address information unit that identifies a physical location on the optical disc,
the address information unit has a plurality of address information bits, and has a plurality of areas where each address information bit can be arranged;
in the address information unit, address information is formed by selecting any one of the plurality of arrangeable areas;
an area unit is composed of a plurality of the address information units,
the address information formed in the plurality of address information units included in the area unit is the same;
An optical disc, wherein a plurality of areas selected by the plurality of address information units included in the area unit are different from each other.
An optical disk apparatus for recording and reproducing information on the optical disk according to claim 1,
a detection area determination unit that determines the plurality of areas to be detected;
an address detection value storage unit that stores a plurality of address detection values of the plurality of address information units included in the area unit;
a selection addition unit that selects and adds the plurality of address detection values stored in the address detection value storage unit based on the plurality of areas determined by the detection area determination unit;
an address information unit position determination section that determines the physical position of the address information unit based on the total value output from the selection addition section and the plurality of areas determined by the detection area determination section. An optical disc device characterized by: