JP2010205337A - Optical disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk device which properly obtains an address from an optical disk. <P>SOLUTION: When an address is detected from an optical disk D through an optical pickup 2, an optical disk device 1A prevents a wrong address from being used by properly deciding whether to use a corrected address 32a including an address with no error correction that is detected from the optical disk D or an address obtained by correcting the corrected address 32a on the basis of the address detected in the past, in accordance with a state of address detection. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention detects an address detected from an optical disc when an optical disc on which consecutive addresses are recorded according to a predetermined rule is accessed and recorded and / or reproduced by an optical pickup movable in the radial direction of the optical disc. The present invention relates to an optical disc apparatus capable of acquiring an accurate address according to a situation.

  In general, as an optical disc capable of recording and / or reproducing various information signals such as audio signals, video signals, and data signals with high density, in addition to the well-known CD (Compact Disc) and DVD (Digital Versatile Disc), Recently, a high-density optical disk called a BD (Blu-ray Disc) with higher density has been put on the market.

  On the signal recording surface of this type of optical disc, tracks for recording and / or reproducing information signals are formed spirally or concentrically from the inner periphery to the outer periphery, and the information is recorded in the track. The information is divided into blocks or sectors which are signal recording / reproduction units, and address information indicating position information of the blocks or sectors is continuously given according to a predetermined rule.

  An optical disk apparatus for recording and / or reproducing an optical disk such as a CD, a DVD, or a BD is provided with a drive mechanism that holds and rotates the optical disk, and is movable in the radial direction of the optical disk to emit a laser beam. An optical pickup that irradiates the signal recording surface of the optical disc in a spot shape, and an information signal recorded on the signal recording surface of the optical disc by the optical pickup, or a recorded information signal recorded on the signal recording surface of the optical disc A signal processing unit for reproducing the image is provided inside.

  At the time of recording / reproduction on the optical disk, information recorded in a predetermined block or sector is detected by detecting an address indicating position information of the block or sector by accessing with an optical pickup movable in the radial direction of the optical disk. When a signal is reproduced or a new information signal is recorded in a predetermined block or sector, the correct address cannot be obtained if an erroneous address detection or an address detection error occurs. As a result, there has been a problem that normal recording / reproducing processing cannot be performed.

  As a first conventional example of a method for solving these problems, when the address detected from the optical disc is continuous with the address detected last time, or the detected address is continuous with the address detected last time, and the address detected last time is By managing the detected address as a valid address when it is consecutive to the address detected the last time, and by managing the count of the currently managed valid address as a new valid address otherwise There is a sector address management system for an optical disc apparatus that can provide correct addresses (see, for example, Patent Document 1).

  In addition, as a second conventional example of a method for solving the above problem, when an address detection error occurs with respect to an address detected from the optical disk, or when the address detected this time is not continuous with the address adopted last time. The value obtained by adding 1 to the previously adopted address value is the current adopted address, and if the previously detected address and the currently detected address are continuous, the currently detected address is used as the current adopted address. Thus, there is a method for detecting the frame address of an optical disc that attempts to reduce the use of erroneous addresses (see, for example, Patent Document 2).

JP 63-224091 A Japanese Patent No. 3332550

  By the way, in the sector address management method of the optical disc apparatus disclosed in Patent Document 1 and the frame address detection method of the optical disc disclosed in Patent Document 2, the address continuation is prevented in order to prevent the use of an erroneously detected address from the optical disc. However, if two or more detected addresses are not consecutive, they are not used as valid addresses. Therefore, address detection errors frequently occur due to scratches or dust on the optical disk, and consecutive addresses are detected. If the situation becomes difficult, the address that was sequentially counted up from the last adopted address, that is, the address corrected based on the last adopted address will continue to be adopted, and is actually accessed. There is a problem that a difference from the address is likely to occur.

  In addition, immediately after a track jump by a small distance from the current address position on the optical disc through the objective lens provided in the optical pickup, the address corrected based on the adopted address immediately before the jump must be adopted. Therefore, there is a problem that the actual address and the adopted address continue to be different until a continuous address is detected thereafter.

  Therefore, when an optical disk on which consecutive addresses are recorded according to a predetermined rule is accessed and recorded and / or reproduced by accessing an optical pickup movable in the radial direction of the optical disk, An object of the present invention is to provide an optical disc apparatus capable of preventing the adoption of an erroneous address by appropriately performing which of the address corrected based on the detected address is adopted in accordance with the detection status of the address. To do.

The present invention has been made in view of the above problems, and the first invention is to access an optical disk on which consecutive addresses are recorded in accordance with a predetermined rule with an optical pickup movable in the radial direction of the optical disk. In the optical disc apparatus for obtaining the address on the optical disc when recording and / or reproducing,
A radial position detecting means for detecting and outputting a current radial position on the optical disc accessed by the optical pickup;
An eccentricity detecting means for detecting and outputting the eccentricity of the optical disc;
Address reproducing means for reproducing the address based on a detection signal detected by the optical pickup,
The address reproducing means includes
A detection unit for detecting address and parity information from the detection signal detected by the optical pickup;
An address correction unit that performs error detection and correction processing of the address using the parity information and outputs an address after correction including an address without error correction, and an error correction result;
An address estimation unit that estimates an expected address range for the corrected address from the current radius position and the eccentricity amount;
An address comparison unit for comparing whether the corrected address is within the expected address range and outputting an address comparison result;
An address determination unit for determining whether the corrected address is valid from the error correction result and the address comparison result;
The corrected address is output when the corrected address is determined to be valid by the address determination unit, while the corrected address is previously determined when the corrected address is determined to be invalid. An optical disc apparatus comprising: an address correcting unit that outputs a corrected address corrected based on a detected address.

The second aspect of the invention relates to an optical disc on which an address on which continuous addresses are recorded according to a predetermined rule is recorded and / or reproduced when accessed by an optical pickup movable in the radial direction of the optical disc. In the optical disc apparatus for obtaining the address of
A radial position detecting means for detecting and outputting a current radial position on the optical disc accessed by the optical pickup;
An eccentricity tolerance output means for outputting the eccentricity tolerance of the optical disc as a fixed value;
Address reproducing means for reproducing the address based on a detection signal detected by the optical pickup,
The address reproducing means includes
A detection unit for detecting address and parity information from the detection signal detected by the optical pickup;
An address correction unit that performs error detection and correction processing of the address using the parity information and outputs an address after correction including an address without error correction, and an error correction result;
An address estimation unit that estimates an expected address range for the corrected address from the current radius position and the eccentricity allowance;
An address comparison unit for comparing whether the corrected address is within the expected address range and outputting an address comparison result;
An address determination unit for determining whether the corrected address is valid from the error correction result and the address comparison result;
The corrected address is output when the corrected address is determined to be valid by the address determination unit, while the corrected address is previously determined when the corrected address is determined to be invalid. An optical disc apparatus comprising: an address correcting unit that outputs a corrected address corrected based on a detected address.

The third invention is the optical disk device of the first or second invention described above,
The address determination unit performs the correction for the case of the corrected address without error correction and the case where the corrected address after error correction has no error correction error and is in the expected address range. In the optical disc apparatus, it is determined that the post-address is valid, while it is determined that the post-correction address is not valid in other cases.

According to a fourth aspect of the present invention, when an optical disk on which continuous addresses are recorded according to a predetermined rule is accessed and recorded and / or reproduced by an optical pickup movable in the radial direction of the optical disk, In the optical disc apparatus for obtaining the address of
A radial position detecting means for detecting and outputting a current radial position on the optical disc accessed by the optical pickup;
An eccentricity detecting means for detecting and outputting the eccentricity of the optical disc;
Address reproducing means for reproducing the address based on a detection signal detected by the optical pickup,
The address reproducing means includes
A detection unit for detecting address and parity information from the detection signal detected by the optical pickup;
An address correction unit that performs error detection and correction processing of the address using the parity information, and outputs a corrected address including an uncorrected address, and an error correction result;
An address estimation unit that estimates an expected address range for the corrected address from the current radius position and the eccentricity amount;
An address comparison unit for comparing whether the corrected address is within the expected address range and outputting an address comparison result;
An address continuity checking unit that checks continuity whether the corrected address is continuous with the previously detected corrected address and outputs an address continuity test result;
An address determination unit that determines whether the corrected address is valid from the error correction result, the address comparison result, and the address continuity check result;
The corrected address is output when the corrected address is determined to be valid by the address determination unit, while the corrected address is previously determined when the corrected address is determined to be invalid. An optical disc apparatus comprising: an address correcting unit that outputs a corrected address corrected based on a detected address.

The fifth aspect of the invention relates to an optical disc on which the addresses recorded in accordance with a predetermined rule are recorded and / or reproduced when accessed by an optical pickup movable in the radial direction of the optical disc. In the optical disc apparatus for obtaining the address of
A radial position detecting means for detecting and outputting a current radial position on the optical disc accessed by the optical pickup;
An eccentricity tolerance output means for outputting the eccentricity tolerance of the optical disc as a fixed value;
Address reproducing means for reproducing the address based on a detection signal detected by the optical pickup,
The address reproducing means includes
A detection unit for detecting address and parity information from the detection signal detected by the optical pickup;
An address correction unit that performs error detection and correction processing of the address using the parity information and outputs an address after correction including an address without error correction, and an error correction result;
An address estimation unit that estimates an expected address range for the corrected address from the current radius position and the eccentricity allowance;
An address comparison unit for comparing whether the corrected address is within the expected address range and outputting an address comparison result;
An address continuity checking unit that checks continuity whether the corrected address is continuous with the previously detected corrected address and outputs an address continuity test result;
An address determination unit that determines whether the corrected address is valid from the error correction result, the address comparison result, and the address continuity check result;
The corrected address is output when the corrected address is determined to be valid by the address determination unit, while the corrected address is previously determined when the corrected address is determined to be invalid. An optical disc apparatus comprising: an address correcting unit that outputs a corrected address corrected based on a detected address.

Furthermore, a sixth invention is the optical disc apparatus of the fourth or fifth invention described above,
The address determination unit includes the corrected address without error correction, the error-corrected address without error correction error and continuous with the corrected address detected last time, and the error-corrected address. While the post-correction address has no error correction error and is within the expected address range, it is determined that the post-correction address is valid, while in other cases the post-correction address is not valid It is an optical disc apparatus characterized by determining.

  According to the optical disc device of the present invention, when an optical disc on which consecutive addresses are recorded according to a predetermined rule is accessed and recorded and / or reproduced by an optical pickup movable in the radial direction of the optical disc, The corrected address after error correction after combining the result of error correction of the detected address and whether or not there is a deviation between the address detected by the optical pickup and the current radial position being accessed, Since it is determined whether to use the corrected address corrected based on the previously detected address with respect to the corrected address, address detection errors frequently occur due to scratches or dust on the optical disk. Even if the continuity of the address cannot be confirmed, use the address that is actually accessed appropriately It can become. As a result, it is possible to prevent an erroneously detected address from being adopted as in the prior art, and an erroneous correction address from being continuously adopted.

  In particular, when a track jump occurs, the address that can be detected correctly immediately after the track jump can be adopted quickly, so that the difference between the adopted address and the address that is actually accessed is minimized. It becomes possible.

1 is a block diagram showing an overall configuration of an optical disc apparatus according to an embodiment of the present invention. 6 is a flowchart for explaining an example of an address determination / correction processing method in the optical disc apparatus according to the embodiment of the present invention. 7 is a flowchart for explaining another example of the address determination / correction processing method in the optical disc apparatus according to the embodiment of the present invention. It is a figure for demonstrating the specific example when the address reproduction | regeneration processing method is applied in the optical disk apparatus of the Example which concerns on this invention. It is the block diagram which showed the whole structure of the optical disk apparatus of the modification which changed the optical disk apparatus of the Example based on this invention partially.

  Hereinafter, an embodiment of an optical disk device according to the present invention will be described in detail with reference to FIGS.

  FIG. 1 is a block diagram showing the overall configuration of an optical disc apparatus according to an embodiment of the present invention.

  First, as shown in FIG. 1, an optical disc apparatus 1A according to an embodiment of the present invention accesses an optical disc D while moving in the radial direction of the optical disc D, and records and / or reproduces an optical pickup 2 (hereinafter referred to as “optical pickup 2”). (Referred to as “PU2”), an address reproducing unit 3 that obtains an address from the detection signal 2a detected by PU2, a reproduction processing unit 4 that obtains reproduction data from the detection signal 2a detected by PU2, and a search on optical disc D by PU2. A search processing unit 5 for recording, a recording processing unit 6 for recording the recording signal 6a on the optical disc D via the PU 2, and an optical pickup moving unit for moving the PU 2 in the radial direction of the optical disc D (hereinafter referred to as a PU moving unit). 7, a radial position detection unit 8 that detects the current radial position on the optical disc D accessed by PU 2, and an eccentric amount that detects the eccentric amount of the optical disc D A detection section 9, a servo processor 10 which controls the servo system of the optical disk apparatus 1A, is schematically constituted by a rotating part 11 that rotates the optical disc D.

  In the optical disc apparatus 1A according to the embodiment of the present invention described above, the rotating unit 11 rotates the optical disc D at a predetermined speed in accordance with the rotation control signal 10a from the servo processing unit 10. In addition, the rotation unit 11 generates one rotation synchronization signal 11 a synchronized with rotation and outputs it to the eccentricity amount detection unit 9.

  In addition, the PU movement control signal 10b from the servo processing unit 10 is output to the PU movement unit 7, and the PU 2 is transmitted in the radial direction of the optical disc D according to the PU movement signal 7a generated by the PU movement unit 7 based on the PU movement control signal 10b. , And a laser beam L emitted from an objective lens (not shown) provided in the PU 2 onto a track (not shown) of the optical disc D in a spot shape, and detection obtained from the reflected light reflected by the optical disc D The signal 2a is output to the address detection unit 31 in the address reproduction unit 3, the reproduction processing unit 4, the track straddling signal generation unit 92 in the eccentricity amount detection unit 9, and the servo processing unit 10, respectively.

  At this time, the PU 2 detects the reflected light from the optical disc D by a multi-divided photodetector (not shown) having a plurality of light receiving areas to obtain a detection signal 2a having a plurality of light receiving amounts, as will be described later. The address information is obtained from the RF signal or push-pull signal obtained by calculating this detection signal 2a in the address reproduction unit 3, and the reproduction data is obtained by calculating the detection signal 2a in the reproduction processing unit 4. (RF signal) is obtained, and a track straddling signal is obtained on the basis of the tracking error signal obtained by calculating the detection signal 2a in the eccentricity amount detection unit 9, and calculation processing is performed in the servo processing unit 10. A servo error signal including a focus error signal and a tracking error signal is obtained.

  Further, the PU 2 records an information signal on the track of the optical disc D in accordance with the recording signal 6 a from the recording processing unit 6.

  The servo processing unit 10 generates a servo error signal 10c from the detection signal 2a output from the PU 2, performs a focus control process and a tracking control process to obtain a focus error signal and a tracking error signal, and outputs the focus error signal. The tracking error signal is output to PU2, and an objective lens (not shown) in PU2 is controlled in the focus direction and the tracking direction.

  In addition, the servo processing unit 10 is based on the PU movement request signal 5a from the search processing unit 5 and an optical pickup movement amount measurement unit (hereinafter referred to as a PU movement amount measurement unit) in the PU movement unit 7 and the radial position detection unit 8. ) The PU movement control signal 10b is output to 82, and the PU 2 is moved to a predetermined track by the cooperative operation with the tracking control process described above. On the other hand, after the movement of PU2 is completed, the servo processing unit 10 outputs a PU movement end notification 10d to the search processing unit 5.

  Further, when the PU moving unit 7 moves the PU 2 with respect to the radial direction of the optical disc D, the PU moving unit 7 sets the origin radius position to, for example, a radius when the PU 2 reaches the origin radial position set on the inner peripheral side of the optical disc D. An origin radius detection signal 7 b from an origin radius position detection sensor (not shown) set to 22.0 mm is output to the PU movement amount measurement unit 82 in the radius position detection unit 8.

  Further, the PU movement amount measurement unit 82 in the radial position detection unit 8 is based on the PU movement control signal 10b output from the servo processing unit 10, and the movement step amount 82a of the PU movement unit 7 when the PU 2 is moved. And the measured moving step amount 82a is output to the radial position calculation unit 83 in the radial position detection unit 8. At this time, the PU movement amount measuring unit 82 initializes the measured movement step amount 82 a in accordance with the origin radius detection signal 7 b from the PU moving unit 7.

  The origin radius storage unit 81 in the radius position detection unit 8 stores an origin radius value 81a having a radius of 22.0 mm, for example, which is set in advance as the origin radius position, and the origin radius value 81a is stored in the radius position calculation unit 83. Output.

  The radial position calculation unit 83 in the radial position detection unit 8 multiplies the movement step amount 82a measured by the PU movement amount measurement unit 82 by a movement amount per step that is predetermined in the PU movement unit 7. The current radius position 83a is calculated by adding it to the origin radius value 81a output from the origin radius storage unit 81 in the radius position detection unit 8, and the current radius position 83a is calculated as an address in the address reproduction unit 3. To the unit 34.

  Here, a predetermined origin radius value 81a in the PU moving unit 7 is set to 22.0 mm, and a movement amount obtained by moving the PU 2 by one step based on a one-step operation by a not-shown stepping motor is, for example, 9.4 μm. If the movement step amount 82a of PU2 is 1000 steps, for example, the current radius position 83a is calculated by the following (Formula 1).

[Equation 1]
Current radial position = 22.0 mm + 9.4 μm × 1000 steps
= 31.4 mm ... (Formula 1).

  Further, the track straddling signal generation unit 92 in the eccentricity amount detection unit 9 generates a signal corresponding to a tracking error from the detection signal 2a output from the PU 2, and extracts a component of a predetermined frequency by a filter (not shown). By binarizing with a comparator (not shown) having hysteresis, a track crossing signal 92 a is generated, and this track crossing signal 92 a is output to the track crossing measuring unit 91 in the eccentricity detecting unit 9.

  Then, the track crossing measurement unit 91 in the eccentricity amount detection unit 9 uses the rotation synchronization signal 11a from the rotation unit 11 and the track crossing signal 92a from the track crossing signal generation unit 92 to rotate the optical disc D once. The number of rising or falling edges of the track straddling signal 92a is measured and output to the eccentricity calculating section 93 in the eccentricity detecting section 9 as the track straddling number 91a.

  Further, the eccentricity amount calculation unit 93 in the eccentricity amount detection unit 9 calculates the eccentricity amount 93a of the optical disc D from the track crossing number 91a output from the track crossing measurement unit 91 by the following (Equation 2), The eccentricity 93a is output to the address estimating unit 34 in the address reproducing unit 3.

[Equation 2]
Eccentricity = (Number of straddling tracks ÷ 4) × track pitch (Equation 2).

  At this time, when the eccentricity amount calculation unit 93 calculates the eccentricity amount 93a, the reason why the track crossing number 91a is divided by “4” is that the tracking error signal generated by the detection signal 2a from the PU2 is in one rotation. By repeating twice for each half rotation, it becomes ½ of the number counted, and becomes ½ of the number counted by the + side and the − side of the binarized track straddling signal 92a. This is because it becomes 1/4.

  The track pitch of the optical disk D is predetermined for each type of optical disk. In the case of BD, DVD, and CD, the track pitch is set to 0.32 μm, 0.74 μm, and 1.6 μm, respectively. Are stored in advance in the eccentricity calculation unit 93, and a track pitch corresponding to the type of the optical disc D determined by the optical disc type determination unit (not shown) is applied.

  Here, when it is detected that the optical disc D is a BD and the measurement result of the track straddling number 91a is 1000 in this BD, the track pitch of the BD is set to 0.32 μm in the above (Equation 2). Substituting the measurement result 1000 of the track straddling number 91a gives the eccentricity 93a from the following (Equation 3).

[Equation 3]
Eccentricity = (1000 ÷ 4) × 0.32 μm = 80 μm (Equation 3)

  Next, the address detection unit 31 in the address reproduction unit 3 performs the address data and the data synchronization based on the data synchronization signal included in the RF signal and the push-pull signal obtained from the detection signal 2 a output from the PU 2. Parity data for error correction with respect to this address data is extracted and output to the address correction unit 32 in the address reproduction unit 3 as a detection address 31a and parity information 31b.

  At this time, a plurality of types of address information are recorded on the optical disc D and differ depending on the type of the optical disc D. However, when it is detected that the optical disc D is a BD, in the following explanation, in the BD An address that changes by two for every two sectors is detected, and the sector address in the data ID that changes by two for every two sectors is indicated in hexadecimal, and "h" is added after the address. Shall be displayed.

  Note that the address information detected by the PU 2 is not limited to the sector address in the data ID described above, and an address of a block unit or another type of address may be used.

  The address correction unit 32 in the address reproduction unit 3 performs error detection and correction processing of the detection address 31a using the parity information 31b, and the corrected address 32a without error correction obtained by this processing or the error The corrected post-correction address 32a is output to the address correction unit 33, the address continuity checking unit 35, and the address comparison unit 36 in the address reproducing unit 3, respectively.

  Further, the address correction unit 32 in the address reproduction unit 3 uses the error continuity check unit 35 and the address in the address reproduction unit 3 as an error correction result 32b including information such as the number of error detections, the number of error corrections, and the presence or absence of correction errors. Each is output to the determination unit 37.

  In this embodiment, an example in which the address detecting unit 31 and the address correcting unit 32 are separately provided in the address reproducing unit 3 will be described. However, the present invention is not limited to this, and both the 31 and 32 are combined to correct the address. It is also possible to adopt a configuration in which a detection signal detected by PU2 is input to this address correction unit and the corrected address and the error correction result are acquired.

  The address estimation unit 34 in the address reproduction unit 3 includes a current radius position 83 a calculated by the radius position calculation unit 83 in the radius position detection unit 8 and an eccentric amount calculation unit 93 in the eccentric amount detection unit 9. From the calculated eccentricity 93a, a range between the lower limit address and the upper limit address for the current radius position 83a is calculated as an expected address range 34a, and this expected address range 34a is sent to the address comparison unit 36 in the address reproducing unit 3. A specific procedure until the expected address range 34a is calculated will be described below.

  First, when the optical disc apparatus 1A of the embodiment is started, in order to initialize the position of PU2, PU2 is moved to the origin radius position where the origin radius is set to 22 mm. Here, since the sensor output signal changes when PU2 reaches the origin radius position detection sensor (not shown) installed in advance at the origin radius position, the PU moving unit 7 uses this sensor output signal as the origin radius detection signal 7b. Is output to the PU movement amount measuring unit 82a in the radial position detecting unit 8. Then, the radial position detector 8 sets the moving step amount 82a to 0 so that the current radius position 83a becomes the origin radius value in accordance with the origin radius detection signal 7b output from the origin radius position detection sensor (not shown). initialize.

  Further, after initialization of the current radius position 83a, the movement step amount 82a of PU2 is constantly measured based on the PU movement control signal 10b output when the servo processing unit 10 moves PU2, and the above-described calculation formula ( The current radius position 83a is calculated in the radius position detector 8 according to the equation (1).

  In addition, after the initialization of the current radius position 83a, in order to irradiate a predetermined area on the track of the optical disc D with the laser beam L, the PU 2 is moved to a position of a predetermined radius (for example, 24 mm) on the outer peripheral side from the origin radius of 22 mm. Keep it.

  Next, the type of the optical disc D mounted on the rotating unit 11 is discriminated by an optical disc type discriminating unit (not shown). At this time, the type of the optical disk D may be determined by any method, but generally, the type of the optical disk D is determined based on a focus error signal obtained by calculating the detection signal 2a from the PU 2.

  Next, after discriminating the type of the optical disk D, the optical disk D is rotated, and after the laser beam L is irradiated onto the optical disk D by the focus control of the servo processing unit 10, the eccentricity detection unit 9 detects the track straddling signal 92a. The generation and measurement of the number of track crossings 91a are performed, and the eccentricity 93a of the optical disc D is detected by the above-described calculation formula (Formula 2) or (Formula 3).

  Next, after irradiating the laser beam L so as to trace the track on the optical disc D by tracking control of the servo processing unit 10, the address detecting unit 31 and the address in the address reproducing unit 3 are based on the detection signal 2a from the PU 2. The correction unit 32 detects and corrects the address. At the same time, based on the current radius position 83a and the eccentricity 93a detected by the address estimation unit 34 as described above, the lower limit address of the expected address range 34a. And the upper limit address are calculated by the following (formula 4) and (formula 5). The calculation formulas (Formula 4) and (Formula 5) are merely examples, and other calculation formulas may be used.

[Equation 4]
Lower limit address = [{(square of current radius−eccentricity) −square of reference radius} × π] ÷ (sector length × track pitch) + reference address (Equation 4).

[Equation 5]
Upper limit address = [{(square of current radius + eccentricity) −square of reference radius} × π] ÷ (sector length × track pitch) + reference address (Formula 5).

  At this time, in (Equation 4) and (Equation 5) described above, the reference radius, sector length, track pitch, and reference address values are known values determined for each type of optical disc D. However, when it is determined that the optical disc D is a single-layer BD, the single-layer BD has a reference radius of 24 mm, a sector length of about 2.23997 mm, and a track pitch of 0.32 μm. Furthermore, the reference address is 100000h in hexadecimal notation.

  On the other hand, when the current radial position detected from the single-layer BD by the radial position detection unit 8 and the eccentricity amount detection unit 9 is, for example, 30 mm and the eccentricity amount is, for example, 50 μm, the above-described values are ( An example of the lower limit address and the upper limit address is calculated by the following (Expression 6) and (Expression 7) by substituting into Expression (4) and (Expression 5), respectively.

[Equation 6]
Lower limit address = [{(30 mm−50 μm) square−24 mm square} × π] ÷ (2.33997 mm × 0.32 μm) +100,000 h = about 2577 BCh (Expression 6).

[Equation 7]
Upper limit address = [{(30 mm + 50 μm) square−24 mm square} × π] ÷ (2.23997 mm × 0.32 μm) + 100,000h = about 25 DE76h (Expression 7).

  The address continuity checking unit 35 in the address reproducing unit 3 is based on the corrected address 32a output from the address correcting unit 32 and the error correction result 32b, and the corrected address 32a detected this time and the corrected address detected immediately before. It is checked whether there is no error correction error with the address 32a and whether they are consecutive correctly according to a predetermined rule, and the address continuity check result 35a is output to the address determination unit 37 in the address reproducing unit 3.

  Further, the address continuity checking unit 35 in the address reproducing unit 3 after the check of the corrected address 32a, the corrected address 32a detected this time for checking the next corrected address 32a and the error correction result 32b, Is stored internally.

  The address comparison unit 36 in the address reproduction unit 3 compares the corrected address 32a output from the address correction unit 32 with the expected address range 34a output from the address estimation unit 34, and the corrected address 32a is the expected address. An address comparison result 36a as to whether or not it is within the range 34a is output to the address determination unit 37 in the address reproduction unit 3.

  In addition, the address determination unit 37 in the address reproduction unit 3 includes an error correction result 32b output from the address correction unit 32, or an error correction result 32b output from the address correction unit 32 and an address output from the address continuity checking unit 35. The continuity check result 35a, or the error correction result 32b output from the address correction unit 32, the address continuity check result 35a output from the address continuity check unit 35, and the address comparison result 36a output from the address comparison unit 36 Based on this, it is determined whether or not the corrected address 32 a is valid, and the corrected address determination result 37 a is output to the address correcting unit 33 in the address reproducing unit 3.

  A specific address determination procedure for the corrected address 32a performed here will be described in detail later. Even if the corrected address 32a is not input to the address determination unit 37, the corrected address 32a is the address. Since the signals are input to the correction unit 33 at the same timing, the validity of the corrected address 32a can be determined based on the above results 32b, 35a, and 36a.

  Further, the address correcting unit 33 in the address reproducing unit 3 determines that the corrected address 32a is valid based on the corrected address determination result 37a from the address determining unit 37. The corrected post-correction address 32a is output as it is to the reproduction processing unit 4, the search processing unit 5 and the recording processing unit 6 as the reproduction address 33a.

  On the other hand, if it is determined that the corrected address 32a is not valid, an address value 2h that changes to the previously output reproduction address 33a by a predetermined value α (α = 2 for every two sectors, for example, as an expected address change amount). ) Are added and output as a reproduction address 33a. However, when the post-correction address 32a that has been determined to be valid has not yet been output since the start of address reproduction, an initial value (such as 0 or FFFFFFFFh) is output as the reproduction address 33a.

  Further, the search processing unit 5 starts search processing in accordance with a search request from the reproduction processing unit 4 and the recording processing unit 6. During the search process, the reproduction address 33a output from the address correction unit 33 in the address reproduction unit 3 is checked as needed, and the PU moves to the servo processing unit 10 until the difference between the reproduction address and the search request address falls within a predetermined range. Output the request repeatedly. When the difference between the reproduction address and the search request address falls within a predetermined range, the search process is terminated, and a search completion notification is output to the reproduction processing unit 4 and the recording processing unit 6.

  The reproduction processing unit 4 outputs a search request for the information signal reproduction start address to the search processing unit 5 and waits for a search end notification to be output from the search processing unit 5. After confirming the end of search by the search end notification, the start and end control of the information signal reproduction process is performed by confirming the reproduction address 33a from the address correction unit 33 in the address reproduction unit 3 as needed. During the information signal reproduction process, a reproduction signal is generated based on the detection signal 2a from the PU 2, and the reproduction data is extracted and output by performing signal processing such as waveform shaping, demodulation, and error correction.

  Further, like the reproduction processing unit 4, the recording processing unit 6 outputs a search request to the information signal recording start address to the search processing unit 5 and waits for a search end notification from the search processing unit 5. After confirming the end of the search, start control and end control of the information signal recording process are performed by confirming the reproduction address 33a from the address reproduction unit 3 as needed. During the information signal recording process, the recording signal 6a is generated based on the recording data inputted from the outside, and the information signal is recorded on the optical disc D by outputting it to the PU 2.

  Various operations of the optical disk apparatus 1A (FIG. 1) according to the embodiment of the present invention configured as described above will be described with reference to FIGS.

  FIG. 2 is a flowchart for explaining an example of an address determination / correction processing method in the optical disc apparatus according to the embodiment of the present invention. FIG. 3 is a flowchart for explaining another example of the address determination / correction processing method in the optical disc apparatus according to the embodiment of the present invention. FIG. 4 is a diagram for explaining a specific example when the address reproduction processing method is applied.

  First, in the optical disc apparatus 1A (FIG. 1) according to the embodiment of the present invention, the address determination / correction processing is performed by either the example method shown in FIG. 2 or the other example method shown in FIG. It is done.

  More specifically, in the example of the address determination / correction processing method shown in FIG. 2, as described above, the detected address 31a and the parity information 31b detected by the address detecting unit 31 in the address reproducing unit 3 are address corrected. The address correction unit 32 performs error detection and correction processing on the detected address 31a based on the parity information 31b. The error correction result 32b obtained at this time is input to the address determination unit 37. Has been.

  The address determination unit 37 uses information included in the error correction result 32b output from the address correction unit 32 to determine whether or not there is an error in the detected address 31a input to the address correction unit 32 in step S201. Check.

  At this time, the detected address 31a in step S201 is equivalent to a post-correction address without error correction that is output without error correction when no error is detected by the address correction unit 32.

  When there is no error in the detected address 31a in step S201 (in the case of YES), the address determining unit 37 determines that the detected address is valid, and the detected address from the address correcting unit 32 is directly corrected without error correction. Since the address is input to the address correction unit 33 as an address, the address correction unit 33 outputs a post-correction address (detection address) without error correction as a reproduction address in step S202 and ends the process.

  On the other hand, if there is an error in the detected address 31a in step S201 (in the case of NO), the address determination unit 37 checks in step S203 whether or not there is an error correction error in the corrected address 32a.

  If there is no error correction error in the corrected address 32a in step S203 (in the case of YES), the address continuity checking unit 35 checks in step S204 whether there is no error correction error in the previous corrected address.

  If there is no error correction error in the previous corrected address in step S204 (in the case of YES), in step S205, the address continuity checking unit 35 further determines that the current corrected address and the previous corrected address are predetermined. Check if it is continuous according to the rules.

  If it is determined in step S205 that the current corrected address and the previous corrected address are continuous according to a predetermined rule (in the case of YES), the address determination unit 37 determines that the corrected address is valid. In step S206, the address correction unit 33 outputs the corrected address as a reproduction address, and the process ends.

  If there is an error correction error in the corrected address 32a in step S203 (in the case of NO), the address determination unit 37 determines that the corrected address is not valid, and the address correction unit 33 outputs the previous time in step S209. A corrected address obtained by adding a predetermined value α (α = address value 2h that changes by two every two sectors, for example, as an expected address change amount) to the reproduced address is output as a reproduced address, and the process ends.

  Further, when it is determined in step S204 that there was an error correction error in the previous corrected address (in the case of NO), it is determined in step S205 that the current corrected address and the previous corrected address were not continuous. In the case (in the case of NO), in step S207, the address comparison unit 36 asks whether or not the corrected address is within the expected address range output from the address estimation unit 34.

  When it is determined in step S207 that the corrected address is within the expected address range (in the case of YES), the address determining unit 37 determines that the corrected address is valid, and in step S208, the address correcting unit 33 is corrected. The address is output as a playback address, and the process ends.

  On the other hand, if it is determined in step S207 that the corrected address is not within the expected address range (in the case of NO), the address determination unit 37 determines that the corrected address is not valid, and the address correction is performed in step S209 described above. The unit 33 outputs the correction address as a reproduction address and ends the process.

  Therefore, according to the example of the address determination / correction processing method described above, if there is no error in the detected address detected from the optical disk, it is output as it is as a reproduction address, and the corrected address is corrected if there is an error in the detected address. If there is no error correction error and the corrected address is continuous with the previous corrected address, or if the corrected address is within the expected address range, the corrected address is output as a playback address, On the other hand, if there is an error correction error in the corrected address, or if the corrected address is not within the expected address range, the corrected address obtained by adding the predetermined value α to the previous playback address is output as the playback address. If the address continuity cannot be confirmed due to frequent address detection errors due to scratches or dust on the D But, it is possible to properly adopt the address that is actually accessed.

  As a result, it is possible to prevent an erroneously detected address from being adopted as in the prior art, and an erroneous correction address from being continuously adopted. In particular, as will be described in a specific example to be described later, when a track jump occurs, an address that can be detected correctly immediately after the track jump can be adopted promptly. It is possible to minimize the deviation from the existing address.

  Next, in another example of the address determination / correction processing method shown in FIG. 3, steps S204 to S206 are omitted from the example of the address determination / correction processing method described above with reference to FIG. Thus, the processing is simplified without providing the address continuity checking unit 35 in the address reproducing unit 3 and will be briefly described here.

  In the other example of the address determination / correction processing method shown in FIG. 3, as described above, the address correction unit 32 is used in step S201 by using the error correction result 32b output from the address correction unit 32 by the address determination unit 37. It is confirmed whether or not there is an error with respect to the detection address 31a input to the.

  If there is no error in the detected address 31a in step S201 (in the case of YES), the address determining unit 37 determines that the detected address is valid, and the detected address 31a is directly corrected from the address correcting unit 32 without error correction. Since the address is input to the address correction unit 33, the address correction unit 33 outputs the post-correction address (detection address) without error correction as a reproduction address in step S202, and ends the process.

  On the other hand, if there is an error in the detected address 31a in step S201 (in the case of NO), the address determination unit 37 checks in step S203 whether or not there is an error correction error in the corrected address 32a.

  If there is no error correction error in the corrected address 32a in step S203 (in the case of YES), in step S207, the address comparison unit 36 determines whether the corrected address is within the expected address range output from the address estimation unit 34. Ask whether or not.

  When it is determined in step S207 that the corrected address is within the expected address range (in the case of YES), the address determining unit 37 determines that the corrected address is valid, and in step S208, the address correcting unit 33 is corrected. The address is output as a playback address, and the process ends.

  On the other hand, if there is an error correction error in the corrected address 32a in step S203 (in the case of NO), or if it is determined in step S207 that the corrected address is not within the expected address range (in the case of NO), address determination The unit 37 determines that the corrected address is not valid, and changes to the reproduction address previously output by the address correction unit 33 in step S209 to a predetermined value α (α = 2 for every two sectors, for example, as an expected address change amount). The correction address obtained by adding the address value 2h) is output as a reproduction address, and the process is terminated.

  Therefore, according to the other example of the address determination / correction processing method described above, if there is no error in the detected address detected from the optical disc, it is output as it is as a reproduction address, and the corrected address is corrected because there is an error in the detected address. When there is no error correction error and the corrected address is within the expected address range, the corrected address is output as a playback address. On the other hand, if there is an error correction error in the corrected address, or after correction When the address is not within the expected address range, the correction address obtained by adding the predetermined value α to the previous reproduction address is output as the reproduction address, so that the optical disc is substantially similar to the above-described example of the address determination / correction processing method. Even when address detection errors occur frequently due to scratches or dust on D, and the continuity of addresses cannot be confirmed Indeed it is possible to properly adopt the address being accessed.

  As a result, it is possible to prevent an erroneously detected address from being adopted as in the prior art, and an erroneous correction address from being continuously adopted. In particular, as will be described in a specific example to be described later, when a track jump occurs, an address that can be detected correctly immediately after the track jump can be adopted promptly. In addition to minimizing the deviation from the existing address, simplification can be achieved by not checking the continuity between the corrected address and the previous corrected address, and processing can be performed in a short time.

  Next, as shown in FIG. 4, in the specific example of the address reproduction processing method described above, in the single-layer BD disc in which the eccentricity is detected to be 50 μm, for example, from the current address position to PU2 (FIG. 1). When a track jump occurs just a short distance through an objective lens (not shown) provided, a track jump occurs immediately before the (n + 1) th time, and among a plurality of types of addresses recorded on the optical disc D, The case where the sector address in the data ID that changes by two for every two sectors is detected is shown.

  First, at the n-th time, the n-th corrected address 100020h has no error correction error and is continuous with an n-1th corrected address 10001Eh (not shown) (the n-th corrected address 100020h is n− Therefore, the nth post-correction address is determined to be valid regardless of whether it is within the expected address range, and is used as a reproduction address. To do.

  Next, at the (n + 1) th time immediately after the occurrence of the track jump, the (n + 1) th corrected address 25A000h has no error correction error, and the previous nth corrected address has no error correction error. The addresses after the first and (n + 1) th correction are not continuous (the (n + 1) th corrected address 25A000h is not continuous with the nth corrected address 100020h + 02h), and therefore it is not determined to be a valid address at this stage.

  Also, it is confirmed whether or not the (n + 1) th corrected address is within the expected address range calculated from the current radial position and the eccentricity. In this example, since the lower limit address and upper limit address of the expected address range are obtained by the above-described calculation formulas (Formula 6) and (Formula 7), the lower limit address is about 2577 BCh and the upper limit address is about 25 DE76h. Therefore, the expected address range is 2577BCh to 25DE76h.

  As a result, it can be seen that the (n + 1) th corrected address is within the expected address range, so that the (n + 1) th corrected address is determined to be an effective address with a low possibility of being erroneous and is adopted as a reproduction address.

  Next, at the (n + 2) th time, the n + 2th corrected address A4A820h has an error correction error, so it is determined that it is not valid without performing another check, and the playback address is added to the previous playback address by 02h. The corrected address 25A002h is adopted.

  Next, since there is no error in the n + 3th corrected address 25A004h at the (n + 3) th time, it is determined to be valid regardless of whether it is within the address continuity or the expected address range, and is adopted as the reproduction address. .

  Next, since there is an error correction error in the n + 4th post-correction address 0F84C0h at the (n + 4) th time, the correction address is adopted as the reproduction address as in the (n + 2) th time.

  Next, at the (n + 5) th time, there is no error correction error in the n + 5th corrected address 25A008h, but since the previous n + 4th corrected address has an error correction error, the address continuity cannot be confirmed. However, similarly to the (n + 1) th time, the corrected address of the (n + 5) th time is within the expected address range (2577BCh to 25DE76h), and is therefore adopted as a reproduction address.

  Next, at the (n + 6) th time, the corrected address 25A00Ah at the (n + 6) th time is adopted as a reproduction address because there is no error correction error as in the nth time and is correctly continued to the address after the previous (n + 5) th correction.

  Here, when the conventional address detection method described above is applied to the address detection state shown in FIG. 4, it is adopted as an effective address when a continuous address can be detected by the conventional address detection method. Therefore, after the track jump occurs immediately before the (n + 1) th time in FIG. 4, the address that is actually accessed is correctly adopted at the (n + 6) th time. That is, since the address (100022h, 100024h,...) Corrected based on the address 100020h before the track jump is erroneously adopted from the (n + 1) th time to the (n + 5) th time, the original addresses 25A000h to 25A008h are detected. The problem of being unable to do so will arise.

  As described above, in the conventional method, there is a high risk of adopting an incorrect address in address detection in an unstable state immediately after the occurrence of a track jump, and as a result, correct recording / reproduction processing is not performed. However, according to the optical disc apparatus 1A (FIG. 1) of the embodiment according to the present invention, an address that is actually accessed can be quickly and appropriately used without adopting an incorrect address even in such a case. It is possible to adopt.

  Next, a modified optical disc apparatus in which the optical disc apparatus of the embodiment according to the present invention is partially modified will be described with reference to FIG.

  FIG. 5 is a block diagram showing the overall configuration of a modified optical disc apparatus in which the optical disc apparatus of the embodiment according to the present invention is partially modified.

  The optical disc device 1B of the modification shown in FIG. 5 has the same configuration except for a part of the configuration of the optical disc device 1A of the embodiment described above with reference to FIG. The constituent members shown are indicated by the same reference numerals, and the constituent members different from those of the embodiment are denoted by new reference numerals, and only differences from the embodiments will be described.

  As shown in FIG. 5, in the optical disc apparatus 1B according to the modification, the eccentricity allowable amount output unit provided by replacing the eccentricity detection unit 9 in the embodiment without calculating the eccentricity amount of the optical disc D. 13 is stored in advance as an allowable eccentricity 131a that is allowable for the optical disc D. The allowable eccentricity 131a is stored in the rotational synchronization signal 11a from the rotating unit 11. The only difference is that the data is output to the address guessing unit 34 in the address reproducing unit 3 at the timing of FIG.

  At this time, the allowable eccentricity 131a stored in the allowable eccentricity storage unit 131 stores an allowable fixed value such as 80 μm in the case of a single layer BD.

  Then, the address estimation unit 34 in the address reproduction unit 3 and the current radius position 83a calculated by the radius position calculation unit 83 in the radius position detection unit 8 described in the embodiment and the offset in the eccentricity allowance output unit 13 are described. Since the lower limit address and the upper limit address of the expected address range 34a are obtained by the above-described calculation formulas (Formula 4) and (Formula 5) based on the eccentricity allowance 131a stored in the core allowance storage unit 131, here By using the expected address range 34a obtained in step 1, an example of the address determination / correction processing method described above with reference to FIG. 2 can be performed.

  The present invention is not limited to the forms of the optical disc apparatus 1A (FIG. 1) of the above-described embodiment and the optical disc apparatus 1B (FIG. 5) of the modification. For example, each unit in FIGS. 1 and 5 is not limited to an electronic circuit configured by hardware, and a computer program that causes a computer to execute part or all of each function is also included in the present invention. In this case, the computer program may be distributed via a network and taken into the computer, or may be recorded on a recording medium (not shown) and taken into the computer from the recording medium, or as firmware. It may be incorporated in the optical disc apparatuses 1A and 1B.

1A: optical disk device of embodiment,
1B: a modified optical disc apparatus in which the embodiment is partially modified,
2 ... Optical pickup (PU), 2a ... Detection signal,
3 ... Address playback section,
31 ... Address detection unit, 31a ... Detection address, 31b ... Parity information,
32 ... Address correction unit, 32a ... Address after correction, 32b ... Error correction result,
33 ... Address correction unit, 33a ... Playback address,
34 ... Address guessing unit, 34a ... Expected address range,
35: Address continuity test unit, 35a: Address continuity test result,
36: Address comparison unit, 36a: Address comparison result,
37 ... address determination unit, 37a ... corrected address determination result,
4 ... Reproduction processing unit,
5 ... Search processing unit, 5a ... PU movement request signal,
6: Recording processing unit, 6a: Recording signal,
7: Optical pickup moving unit (PU moving unit),
7a ... PU movement signal, 7b ... Origin radius detection signal,
8: Radial position detector,
81 ... Origin radius storage unit, 81a ... Origin radius value,
82 ... Optical pickup movement amount measurement unit (PU movement amount measurement unit), 82a ... Movement step amount,
83: Radial position calculation unit, 83a: Current radial position,
9: Eccentricity detection unit,
91 ... Track straddling measurement unit, 91a ... Number of track straddling,
92 ... Track crossing signal generation unit, 92a ... Track crossing signal,
93: Eccentricity calculation unit, 93a: Eccentricity,
10 ... Servo processing unit, 10a ... Rotation control signal, 10b ... PU movement control signal,
10c: Servo error signal, 10d: PU movement end notification,
11 ... rotating part, 11a ... rotation synchronization signal,
13: Eccentricity tolerance output section,
131: Allowable eccentricity storage unit, 131a: Allowable eccentricity,
D: Optical disk, L: Laser beam.

Claims (6)

An optical disc apparatus for acquiring the address on the optical disc when an optical disc on which consecutive addresses are recorded according to a predetermined rule is accessed and recorded and / or reproduced by an optical pickup movable in the radial direction of the optical disc In
A radial position detecting means for detecting and outputting a current radial position on the optical disc accessed by the optical pickup;
An eccentricity detecting means for detecting and outputting the eccentricity of the optical disc;
Address reproducing means for reproducing the address based on a detection signal detected by the optical pickup,
The address reproducing means includes
A detection unit for detecting address and parity information from the detection signal detected by the optical pickup;
An address correction unit that performs error detection and correction processing of the address using the parity information and outputs an address after correction including an address without error correction, and an error correction result;
An address estimation unit that estimates an expected address range for the corrected address from the current radius position and the eccentricity amount;
An address comparison unit for comparing whether the corrected address is within the expected address range and outputting an address comparison result;
An address determination unit for determining whether the corrected address is valid from the error correction result and the address comparison result;
The corrected address is output when the corrected address is determined to be valid by the address determination unit, while the corrected address is previously determined when the corrected address is determined to be invalid. An optical disk apparatus comprising: an address correction unit that outputs a corrected address corrected based on a detected address. An optical disc apparatus for acquiring the address on the optical disc when an optical disc on which consecutive addresses are recorded according to a predetermined rule is accessed and recorded and / or reproduced by an optical pickup movable in the radial direction of the optical disc In
A radial position detecting means for detecting and outputting a current radial position on the optical disc accessed by the optical pickup;
An eccentricity tolerance output means for outputting the eccentricity tolerance of the optical disc as a fixed value;
Address reproducing means for reproducing the address based on a detection signal detected by the optical pickup,
The address reproducing means includes
A detection unit for detecting address and parity information from the detection signal detected by the optical pickup;
An address correction unit that performs error detection and correction processing of the address using the parity information and outputs an address after correction including an address without error correction, and an error correction result;
An address estimation unit that estimates an expected address range for the corrected address from the current radius position and the eccentricity allowance;
An address comparison unit for comparing whether the corrected address is within the expected address range and outputting an address comparison result;
An address determination unit for determining whether the corrected address is valid from the error correction result and the address comparison result;
The corrected address is output when the corrected address is determined to be valid by the address determination unit, while the corrected address is previously determined when the corrected address is determined to be invalid. An optical disk apparatus comprising: an address correction unit that outputs a corrected address corrected based on a detected address.   The address determination unit performs the correction for the case of the corrected address without error correction and the case where the corrected address after error correction has no error correction error and is in the expected address range. 3. The optical disk apparatus according to claim 1, wherein it is determined that the post-address is valid, while it is determined that the post-correction address is not valid in other cases. An optical disc apparatus for acquiring the address on the optical disc when an optical disc on which consecutive addresses are recorded according to a predetermined rule is accessed and recorded and / or reproduced by an optical pickup movable in the radial direction of the optical disc In
A radial position detecting means for detecting and outputting a current radial position on the optical disc accessed by the optical pickup;
An eccentricity detecting means for detecting and outputting the eccentricity of the optical disc;
Address reproducing means for reproducing the address based on a detection signal detected by the optical pickup,
The address reproducing means includes
A detection unit for detecting address and parity information from the detection signal detected by the optical pickup;
An address correction unit that performs error detection and correction processing of the address using the parity information, and outputs a corrected address including an uncorrected address, and an error correction result;
An address estimation unit that estimates an expected address range for the corrected address from the current radius position and the eccentricity amount;
An address comparison unit for comparing whether the corrected address is within the expected address range and outputting an address comparison result;
An address continuity checking unit that checks continuity whether the corrected address is continuous with the previously detected corrected address and outputs an address continuity test result;
An address determination unit that determines whether the corrected address is valid from the error correction result, the address comparison result, and the address continuity check result;
The corrected address is output when the corrected address is determined to be valid by the address determination unit, while the corrected address is previously determined when the corrected address is determined to be invalid. An optical disk apparatus comprising: an address correction unit that outputs a corrected address corrected based on a detected address. An optical disc apparatus for acquiring the address on the optical disc when an optical disc on which consecutive addresses are recorded according to a predetermined rule is accessed and recorded and / or reproduced by an optical pickup movable in the radial direction of the optical disc In
A radial position detecting means for detecting and outputting a current radial position on the optical disc accessed by the optical pickup;
An eccentricity tolerance output means for outputting the eccentricity tolerance of the optical disc as a fixed value;
Address reproducing means for reproducing the address based on a detection signal detected by the optical pickup,
The address reproducing means includes
A detection unit for detecting address and parity information from the detection signal detected by the optical pickup;
An address correction unit that performs error detection and correction processing of the address using the parity information and outputs an address after correction including an address without error correction, and an error correction result;
An address estimation unit that estimates an expected address range for the corrected address from the current radius position and the eccentricity allowance;
An address comparison unit for comparing whether the corrected address is within the expected address range and outputting an address comparison result;
An address continuity checking unit that checks continuity whether the corrected address is continuous with the previously detected corrected address and outputs an address continuity test result;
An address determination unit that determines whether the corrected address is valid from the error correction result, the address comparison result, and the address continuity check result;
The corrected address is output when the corrected address is determined to be valid by the address determination unit, while the corrected address is previously determined when the corrected address is determined to be invalid. An optical disk apparatus comprising: an address correction unit that outputs a corrected address corrected based on a detected address.   The address determination unit includes the corrected address without error correction, the error-corrected address without error correction error and continuous with the previously detected corrected address, and the error-corrected address. While the post-correction address has no error correction error and is within the expected address range, it is determined that the post-correction address is valid, while in other cases the post-correction address is not valid 6. The optical disc apparatus according to claim 4, wherein the optical disc apparatus is determined as follows.

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