JP2006228323A - Recording/reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recording/reproducing device capable of deciding optimal recording conditions by eliminating evaluation data (jitters, or modulation degree) affected by a defect even when the defect such as a flaw or a fingerprint is present in an OPC area. <P>SOLUTION: A pickup 12 reproduces a test signal recorded in the OPC area of an optical disk 10 by switching a plurality of kinds of recording conditions by an ECC block unit. A control unit 15 detects the evaluation data (jitters or modulation degree) of the reproduced test signal from an RF signal processing section 14. When evaluation data obtained at the cycle of a plurality of ECC blocks recorded per track is larger than that obtained from the ECC block before or after, the control unit 15 judges that the evaluation data are an ECC block having a defect, and obtains optimal recording conditions from remaining evaluation data other than the evaluation data of the reproduced test signal of one track cycle. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a recording / reproducing apparatus, and in particular, a plurality of recording conditions (recording power, recording pulse width) in an optimum power control (OPC) area of a rewritable optical disc defined by the BD-RE standard. The present invention relates to a recording / reproducing apparatus that performs recording while changing the value and determines optimum recording conditions using evaluation data (jitter, modulation degree).

  In a rewritable optical disc defined by the BD-RE standard or the like, as shown in FIG. 6, an OPC area 30 is defined on the inner periphery side of a user data area 31 for a user to record and reproduce arbitrary information. Yes. In the conventional recording / reproducing apparatus, random EFM data is test-recorded while changing the recording conditions (recording power, recording pulse width) in a plurality of stages in the OPC area 30, and optimum using evaluation data (jitter, modulation degree). It is known to determine a proper recording condition (for example, see Patent Document 1).

  Specifically, the test signal, which is random EFM data, is in the form of an RF signal in units of error correction blocks (ECC blocks) of a predetermined format with a predetermined number of bytes, similar to the user data recorded in the user data area 31. Recorded in the OPC area 30. After recording the test signal, the OPC area 30 is reproduced, the evaluation data (jitter and modulation degree) is detected from the reproduced RF signal, and when jitter is used as the evaluation data, the recording power that minimizes the jitter is optimally recorded. Determined as power value.

JP 2000-137918 A

  However, recording is performed while sequentially switching a plurality of types of recording conditions in the OPC area 30 of the rewritable optical disc defined by the BD-RE standard, and the optimum recording conditions (recording degree) using the evaluation data (modulation degree and jitter). When determining the power and the recording pulse width), as shown in FIG. 6, in the OPC area 30, it is possible to detect probable evaluation data (modulation degree and jitter) when a defect 32 such as a flaw or a fingerprint exists. Disappear.

  That is, when evaluation data (jitter or modulation degree) is detected from the reproduction RF signal in the OPC area 30, the evaluation data detected from the ECC block where the defect 32 exists is compared with the evaluation data detected from the ECC block where the defect 32 is not present. A large value is detected even under the same recording condition, and the optimum recording condition cannot be obtained. In particular, in the case of a small disk in which one ECC block in the OPC area 30 extends over several tracks, the influence of the defect is large.

  Even when the upper limit value is determined for the evaluation data, the influence of the defect can be removed only for the evaluation data detected from the ECC block where the defect exists, exceeding the upper limit value. The effect of the defect cannot be completely removed. Furthermore, in the case of a small disk in which one ECC block reaches several tracks in the OPC area 30, there is a high possibility that a defect exists in all ECC blocks, and therefore there is a possibility that optimum recording conditions cannot be obtained. high.

  The present invention has been made in view of the above points. Even when a defect such as a flaw or a fingerprint exists in the OPC area, the present invention is optimal by removing evaluation data (jitter, modulation degree) affected by the defect. An object of the present invention is to provide a recording / reproducing apparatus capable of determining recording conditions.

  In order to achieve the above object, the present invention provides a recording / reproducing apparatus for recording / reproducing data on a rewritable optical disc, wherein a test signal is predetermined on the optical disc while sequentially switching a plurality of types of recording conditions in a predetermined recording unit. Recording means for recording in the test area, evaluation data detecting means for detecting evaluation data for evaluating the recording characteristics of the recording conditions in a predetermined recording unit based on a test signal reproduced from the test area of the optical disc, and one of the test areas If the evaluation data becomes larger than the evaluation data of the preceding and following predetermined recording units in the cycle determined from the ratio of the predetermined recording unit to the track, it is assumed that there is a defect at the position where the evaluation data is detected and the detected position Defect detection address recording means for recording an address in a specific area of the optical disc, and evaluation data Of the plurality of evaluation data detected by the output means, the evaluation data detected from a predetermined recording unit including the address recorded in a specific area is removed, and the optimum recording condition is determined from the remaining evaluation data And a recording condition determining means.

  In the present invention, when the evaluation data becomes larger than the evaluation data of the preceding and following predetermined recording units in the cycle determined from the ratio of the predetermined recording unit to one track, that is, the test of the predetermined recording unit reproduced in one track cycle. When the evaluation data based on the signal is larger than the evaluation data based on each test signal of the predetermined recording unit immediately before and immediately after that, it is determined that there is a defect in the predetermined recording unit reproduced in the one track period, Since the evaluation data based on the test signal of the predetermined recording unit reproduced in the one-track cycle is removed and the optimum recording condition is determined from the remaining evaluation data, the influence on the optimum recording condition determination by the defect is affected. Can be eliminated.

  In order to achieve the above object, the present invention is configured to switch the above-mentioned recording means while sequentially switching a plurality of types of recording conditions in units of one error correction block, which is a predetermined recording unit of a test signal and information data, and It is assumed that a test signal is recorded in a predetermined test area of the optical disk at a rate of a plurality of error correction blocks per track, and the defect detection address recording means performs evaluation data at a period of a plurality of error correction blocks constituting one track. If it is larger than the evaluation data of the preceding and succeeding error detection / correction blocks, it is assumed that a defect exists at the position where the evaluation data of the period of the plurality of error correction blocks is detected, and the address of the detected position is stored in a specific area of the optical disc It is characterized by being recorded.

  In the present invention, among the test signals reproduced from the test area of the optical disc in which the test signals are recorded in the test area at a rate of a plurality of error correction blocks per track, the signals from the plurality of error correction blocks having the same cycle as that of one track are used. When the evaluation data based on the reproduction signal is larger than the evaluation data of the preceding and succeeding error correction blocks, it is determined that a defect exists at the position where the evaluation data is detected, and error correction block units reproduced in the one-track period Since the evaluation data based on the test signal is removed and the optimum recording condition is determined from the remaining evaluation data, the influence of the defect on the optimum recording condition determination can be eliminated.

  In order to achieve the above object, according to the present invention, the recording means described above is configured such that when one error correction block, which is a predetermined recording unit of a test signal and information data, is composed of N sectors, one error correction block unit. The above-described defect detection address is configured such that a test signal is recorded in a predetermined test area of the optical disc at a rate of M sectors (where M <N) while sequentially switching a plurality of types of recording conditions. When the evaluation data of the recording means is larger than the evaluation data of the preceding and succeeding error detection and correction blocks in the period of M sectors, it is assumed that there is a defect at the position where the evaluation data of the period of M sectors is detected. The address of the detected position is recorded in a specific area of the optical disc.

  In the present invention, a test signal is determined in advance on the optical disk while sequentially switching a plurality of types of recording conditions in units of one error correction block composed of N sectors, and at a rate of M sectors (where M <N) per track. In the test signal reproduced from the test area of the optical disk recorded in the test area, the evaluation data based on the reproduction signal from the M sector having the same cycle as one track is larger than the evaluation data of the preceding and succeeding error correction blocks Determines that there is a defect at the position where the evaluation data is detected, removes the evaluation data based on the test signal in units of M sectors reproduced in the one-track period, and determines the optimum recording condition from the remaining evaluation data. Thus, the influence of the defect on the determination of the optimum recording condition can be eliminated.

  According to the present invention, evaluation data based on a test signal of a predetermined recording unit reproduced in one track period among evaluation data (jitter, modulation degree, etc.) obtained based on a reproduction test signal reproduced from a test area. Is larger than the evaluation data based on each test signal of the predetermined recording unit immediately before and immediately after that, it is determined that there is a defect in the predetermined recording unit reproduced in the one track cycle, and in the one track cycle Since the evaluation data based on the test signal of the predetermined recording unit to be reproduced is removed and the optimum recording condition is determined from the remaining evaluation data, even when defects such as scratches and fingerprints exist in the test area, It is possible to eliminate the influence of the defect on the determination of the optimum recording condition, which makes it possible to accurately determine the optimum recording condition. Kill.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a recording / reproducing apparatus according to the present invention. In the figure, an optical disk 10 is rotated by a spindle motor 11 by a constant linear velocity (CLV) control or a constant angular velocity (CAV) control. A pickup 12 is provided so as to face and separate from the optical disk 10, and laser light having recording conditions set from the pickup 12 is emitted and condensed on the optical disk 10, whereby data can be recorded on the optical disk 10.

  That is, when recording data, the recording data is encoded into a predetermined format by the encoder 16 and then supplied to the laser driving unit 13. The laser driver 13 generates a drive signal based on the encoded recording data, and drives the semiconductor laser in the pickup 12 so that the intensity of the laser beam emitted from the semiconductor laser is modulated by the recording data. Then, data is recorded by irradiating the laser beam on the optical disc 10 in a focused manner. The recording condition in the laser driving unit 13 is determined by a control signal from the control unit 15. Specifically, data is recorded by changing the recording conditions in a plurality of stages in the OPC area of the optical disc 10, and the optimum recording conditions are determined based on the signal quality of the reproduced data.

  On the other hand, at the time of reproduction, a laser beam under reproduction conditions is emitted from the pickup 12 and condensed on the optical disk 10, whereby reflected light reflected from the optical disk 10 is received by a detection optical system in the pickup 12 and photoelectrically converted. As a result, the recorded data on the optical disk 10 can be read. That is, the reproduction RF signal output from the detection optical system in the pickup 12 is supplied to the RF signal processing unit 14. The RF signal processing unit 14 supplies a baseband signal obtained by performing predetermined signal processing on the reproduced RF signal to the decoder 17. The decoder 17 decodes the input signal and outputs it as reproduction data.

  The control unit 15 determines the optimum recording condition based on the data reproduction signal quality. That is, the evaluation data of the reproduction RF signal from the RF signal processing unit 14 is detected, and the optimum recording condition is determined using the evaluation data.

  FIG. 2 shows a block diagram of an embodiment of the control unit 15. As shown in FIG. 2, the control unit 15 includes an evaluation data detection unit 151, a defect position detection unit 152, and an optimum recording condition determination unit 153. The evaluation data detector 151 detects evaluation data from the input reproduction RF signal. The evaluation data is input to the defect position detection unit 152, and the period of the evaluation data affected by the defect when the defect exists is obtained from the ratio of the ECC block or sector to one track. When a pattern larger than this data is found, it is assumed that a defect exists in the detection source address (sector address), and that address is recorded in a DSI area provided separately from the OPC area 30 and the user data area 31 of the optical disk. The above address can be detected from the reproduction RF signal.

  Based on the address recorded in the DSI area, the optimum recording condition determination unit 153 removes the evaluation data in units of ECC blocks or sectors detected as having defects, and uses the remaining evaluation data to optimize The appropriate recording conditions.

  Next, the operation principle of the first embodiment will be described with reference to the drawings. FIG. 3 is a diagram showing the relationship between the recording conditions and jitter for each ECC block when 9 ECC blocks are recorded in the OPC area while changing the recording conditions in units of ECC blocks and jitter is used as evaluation data. Here, the OPC area 30 on the optical disc shown in FIG. 6 is assumed to be 3 ECC blocks per track. Therefore, in this case, when a defect 32 such as a flaw or a fingerprint as shown in FIG. 6 exists in the OPC area 30, the jitter is larger than the detected jitter from the preceding and succeeding ECC blocks every three ECC blocks. This is because the position where the defect exists is usually once again from the characteristic of the optical disc, and the defect is also present at the same place.

  Next, the optimum recording condition determination unit 153 performs jitter detection, plots the jitter in units of ECC blocks, and further obtains an approximate characteristic of the jitter of each ECC block from the detected jitter. In FIG. 3, “x” is the actually detected jitter, and the solid line I indicates the characteristic of the approximate expression of the jitter of all ECC blocks in the OPC area, which is obtained from the actually detected jitter.

  Next, the optimum recording condition determination unit 153 checks whether the jitter is larger than the preceding and following jitters for every 3 ECC blocks (that is, for each track). From FIG. 3, the recording conditions 3, 6 and 9 (in other words, the respective recording conditions when the test signal is recorded on the third, sixth and ninth ECC tracks) are compared with the jitter before and after each in the 3ECC block period. You can see that it is getting bigger. The 3ECC block cycle indicates that the defect is present at the same position when the position where the defect exists makes a round due to the characteristics of the optical disk.

  Therefore, it is assumed that there is a defect at the position recorded under the recording conditions 3, 6 and 9, and the address indicating the recording position is recorded in the DSI area to remove the jitter. That is, the jitter detected from the ECC block including the address indicating the position recorded under the recording conditions 3, 6, 9 is removed, and the positions of the positions recorded under the remaining recording conditions 1, 2, 4, 5, 7, 8 are removed. The characteristic of the approximate expression is obtained from the jitter. The characteristic of this approximate expression is indicated by a dotted line II in FIG.

  The characteristic of the approximate expression represented by the dotted line II is closer to the actual jitter than the characteristic of the approximate expression represented by the solid line I, and has a good value. Further, the jitter of the approximate expression represented by the dotted line II is also minimized where the actual jitter is minimized. However, the approximate expression represented by the solid line I is not, and a non-optimal recording condition is determined as the optimal recording condition due to the influence of the defect. However, the characteristic of the approximate expression represented by the dotted line II is not affected by the defect, and it can be determined that the recording condition 5 having the minimum jitter is the optimum recording condition.

  Next, the operation principle of the second embodiment will be described with reference to the drawings. This embodiment is an example in which an optimum recording condition is obtained for a small disk in which one ECC block has four tracks in the OPC area. 9 ECC blocks are recorded in the OPC area while changing the recording conditions in units of ECC blocks.

  Jitter is used as evaluation data, an approximate expression is obtained from the jitter obtained in units of ECC blocks, and an optimum recording condition that minimizes the jitter is determined from the approximate expression. However, the OPC area 30 shown in FIG. 6 is an example of a small disk having 1 ECC block per 4 tracks. Therefore, in this case, when a defect 32 such as a scratch or a fingerprint as shown in FIG. 6 exists in the OPC area 30, when one ECC block is composed of 32 sectors as shown in FIG. For every 8 (= 32/4) sectors, the jitter becomes larger than the detected jitter from the preceding and succeeding sectors.

  As in the first embodiment, when jitter is detected in ECC blocks and the ECC block determined to have a defect is removed, all evaluation data may be removed in the case of a small disk. is there. Therefore, in the second embodiment, jitter detection is performed in units of sectors.

  FIG. 5 is a diagram showing an example in which jitter in one ECC block of the above-described small disk is detected in units of sectors. In the figure, x is the actually detected jitter. Next, it is confirmed whether the jitter is larger than that of the preceding and succeeding sectors for every track, that is, every 8 sectors. In FIG. 5, it can be seen that the jitter of sectors 4, 12, 20, and 28 having a period of 8 sectors is larger than the jitter before and after.

  Therefore, the control unit 15 determines that there is a defect in the attachment of the sectors 4, 12, 20, and 28, and records the addresses of the sectors 4, 12, 20, and 28 in the DSI area provided in advance on the optical disc. Thereafter, the control unit 15 removes the jitter detected from these sectors 4, 12, 20, and 28, and sets the average of the jitter detected from the remaining 28 sectors as the jitter of one ECC block.

  As a result, according to the present embodiment, even in the case of a small disk, it is possible to detect the jitter in units of ECC blocks that are not affected by the defect without removing all evaluation data. The recording condition corresponding to the minimum jitter can be determined as the optimum recording condition.

It is a block diagram of one embodiment of a recording / reproducing apparatus of the present invention. It is a block diagram of one Embodiment which shows the structure of the control part in FIG. It is a figure which shows an example of the relationship of the ECC block from which jitter and recording conditions differ. It is a format figure which shows an example of the relationship between an ECC block and a sector. It is a figure which shows an example of the relationship between a jitter and a sector. It is a figure which shows an example of the OPC area | region of an optical disk.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Optical disk 11 Spindle motor 12 Pickup up 13 Laser drive part 14 RF signal processing part 15 Control part 16 Encoder 17 Decoder 30 OPC area 31 User data area 32 Defect 151 Evaluation data detection part 152 Defect position detection part 153 Optimal recording condition determination part

Claims (3)

In a recording / reproducing apparatus for recording / reproducing data on a rewritable optical disc,
Recording means for recording a test signal in a predetermined test area of the optical disc while sequentially switching a plurality of types of recording conditions in a predetermined recording unit;
Evaluation data detecting means for detecting, in the predetermined recording unit, evaluation data for evaluating the recording characteristics of the recording condition based on the test signal reproduced from the test area of the optical disc;
If the evaluation data is larger than the evaluation data of the predetermined recording unit before and after the cycle determined from the ratio of the predetermined recording unit to one track in the test area, a defect exists at the position where the evaluation data is detected. A defect detection address recording means for recording the address of the detected position in a specific area of the optical disc;
Of the plurality of evaluation data detected by the evaluation data detecting means, the evaluation data detected from the predetermined recording unit including the address recorded in the specific area is removed, and the remaining evaluation is performed. A recording / reproducing apparatus comprising: recording condition determining means for determining an optimum recording condition from data. The recording means sequentially switches the plurality of types of recording conditions in units of one error correction block, which is the predetermined recording unit of the test signal and information data, and at a rate of a plurality of error correction blocks per track. Recording a test signal in a predetermined test area of the optical disc;
The defect detection address recording means, when the evaluation data becomes larger than the evaluation data of the preceding and succeeding error detection and correction blocks in the period of the plurality of error correction blocks constituting the one track, 2. The recording / reproducing apparatus according to claim 1, wherein an address at the detected position is recorded in a specific area of the optical disc, assuming that there is a defect at the position where the period evaluation data is detected. The recording means sequentially switches the plurality of types of recording conditions in units of one error correction block when one error correction block as the predetermined recording unit of the test signal and information data is composed of N sectors, and Recording the test signal in a predetermined test area of the optical disc at a rate of M sectors (where M <N) per track;
The defect detection address recording means detects the evaluation data of the period of the M sectors when the evaluation data is larger than the evaluation data of the preceding and succeeding error detection and correction blocks in the period of the M sectors. 2. The recording / reproducing apparatus according to claim 1, wherein an address of the detected position is recorded in a specific area of the optical disc, assuming that there is a defect.

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