TW200837733A - Optical disc and recording power determination method - Google Patents

Abstract

A method (300) of determining an optimum recording power of a radiation beam for recording data onto a record carrier is disclosed. The method comprises determining a first recording power of the radiation beam based on Jitter and a second recording power of the radiation beam based on block error rate (BLER). The method further comprises determining the optimum recording power of the radiation beam based on a difference between the first recording power of the radiation beam and the second recording power of the radiation beam. The technique is useful for all optical disc recording devices.

Description

200837733 IX. INSTRUCTIONS OF THE INVENTION: TECHNICAL FIELD OF THE INVENTION The subject of the present invention relates to a disc recording of the recording power of the ray 1 for recording data on a disc and more specifically the beam. ^ [Prior Art] US 2003/0053386 discloses a CD-ROM, in which the laser light power for writing data on one is optimized. "" The material changes the laser light power at the same time, and based on the _= written on the disc, the mouth of the test port, the 重 & & 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 By means of inaccuracy, the laser power that is favored by the law is more favorable to determine the optimum recording power of one of the radiation beams of the Bayer on a record carrier. The Fa is also advantageous in that it has the ability to accurately determine the most "δ-recorded power" of the radiation beam that is suitable for the money spent on recording the ancient (4) body in the county. SUMMARY OF THE INVENTION ^The method of "money for recording the best recording power of the beam on the record carrier".兮* The method determines the two-dimensional recording power of the dither-based radiation beam and the radiation beam based on the block error rate - the second record 1 blood: the financial method further comprises determining the first-recording work based on the radiation beam The optimum recording power of the radiation beam of the difference between the second recording power of the beam of radiation. In the island display driver, the driver includes an optical pickup unit 70 configured to generate a beam of radiation and focus the beam onto a record carrier of 125644.doc -5 - 200837733. The driver further includes a control unit configured to control the optical pickup unit, wherein the control unit further includes a -th recording power determining unit configured to determine the jitter-based radiation beam One of the first recording powers. The control unit further includes a second recording power decision unit </ RTI> configured to determine a second recording power of one of the radiation beams based on the block error rate. The control unit further includes an optimum recording power determining unit configured to determine an optimum recording of the radiation beam of the difference between the first recording power of the light beam and the second recording power of the radiation beam power. In addition, the precise determination of the radiation beam used to record a beam of data on a record carrier can be carried out using a computer-based method. [Embodiment] Fig. 3 shows a method of determining the optimum recording power for a radiation beam for recording data on a record carrier. In step 3〇2, the first-recording power of one of the dither-based round beams is determined. In step 304, &amp; one of the radiation beams based on the block error rate (BLER) is the second recording power. The optimum recording power of the radiation beam based on the difference between the first recording power of the radiation beam and the second recording power of the radiation beam is determined in step 3〇6. Jitter is one of the very low level/physical indications of HF彳a quality. Generally, if the HF signal has low jitter, the signal quality is guaranteed and thus leads to better data accuracy. The BLER block or frame has a rate of at least one incorrect bit per second. BLER indicates the actual information that needs to be read. . quality. It is generally assumed that low jitter means low BLER, which is the original for most recorders or players to use jitter as an index for almost any calibration. 125644.doc 200837733

because. Studies have shown a clear correlation between BLER and jitter. When jitter is not as high, a lower jitter can result in a higher BLER and vice versa. This may be due to the nature of the media and/or the characteristics of the disc device system. Using BLER or jitter based on media and system characteristics will ensure optimal performance for the media and system. Selecting a corresponding power calibration index based on the media and the system characteristics provides an optimum recording power suitable for the media (i.e., achieving superior media recording quality). As the environment changes (such as temperature and humidity), the stability of the media and the characteristics of the DVD soil R/RW will change, and the bler will provide better indication of this change and the correlation with the uncorrectable error than jitter. Therefore, bler is used in the disclosed method. In a specific embodiment, determining an optimum recording power of the radiation beam based on a difference between the first recording power of the radiation beam and the second recording power of the radiation beam comprises determining an optical recording power of the radiation beam based on the calibration step difference . This condition helps determine which calibration power to use. In another embodiment, the calibration step differences are determined based on the resolution of the power of the radiation beam used to record the data on the record carrier. The number of calibration step differences depends on the calibration power resolution. For example, the calibration step can correspond to a difference of 0.75 mW per segment. Another way to interpret this is to use a calibrated power difference of 〇75 mW instead of one of the calibrated power step differences. In another embodiment, determining an optimum recording power of the radiation beam based on the calibration step includes determining whether a difference between the first recording power of the radiation beam and the second recording power of the radiation beam is substantially greater than 2 Calibration segments: If the difference is greater than 2 calibration step differences, then it is determined to be in the radiation beam; whether the BLER count of a recording power is greater than the BLER count of the power of the second record of the radiation beam 125644.doc 200837733 - the predetermined number of counts and if The second recording power of the radiation beam is then selected as the optimum recording power of the radiation beam. The predetermined number of counts can be about 7.5. If (first recording power to second recording power) &gt; 2 calibration step differences, then {if (BLER count at the first recording power - BLER count at the second recording power) &gt; 15) then {best record Power = second recording power}. In another embodiment, the determined recording power of the radiation beam is used to record data on the record carrier. This ensures better recording quality and improves overall recording performance. In another embodiment, the first recording power of the jitter-based radiation beam and the second recording power of the BLER-based radiation beam comprise the following steps and one of the possible outcomes of the procedure is shown in FIG. The recording power of the radiation beam is set to the maximum allowable power, which is calculated as Pwp + 25%. 2. Reduce the test power value by a difference in length; 3. Record the test data on the record carrier. 4. U buy test data from far 5 and measure jitter and bler. 5. Repeat steps 2 through 4 until the test power value reaches a minimum test power' which corresponds to Pwp-25%. 6. Curve fitting the test power values and corresponding jitter and BLER values. 7. Find the first recorded power of the radiation beam that is substantially the smallest. 8. Find the second recording power of the substantially minimum beam of radiation of the BLER. The jitter-based power calibration is performed on the basis of the beta power calibration result. It means that the system first executes the β-OPC and obtains the school 125644.doc 200837733 quasi-optical power Pwp, which corresponds to the target beta value required by the medium. The starting power for the jitter-based trimming calibration will be PwP - 25%. The maximum calibration power for jitter will be Ρ\νβ + 25%. Within this calibrated power range, as shown in Figure 5, 15 steps of power are selected. As shown in FIG. 5, for each power Pi pregroove; pre-groove intra-site address frame (ie, 2 ECC (error correction code) blocks = 4 ADIP frames and 1 ADIP signal Box = 4 physical magnetic regions). When performing jitter and bLER measurements,

The recording of the eight ADIP frames compensates for possible errors such as eccentricity such that the jitter and BLER readout measurements occur during a disc rotation. The recording is performed from the outer edge of the record carrier to its inner edge. The starting power is derived from the power of Pwp of β OPC, as shown in Figure 5. The laser power will travel from pwp + 25% to Ρχνβ _ 25% at 15 power levels (30 ECC blocks). At each power level, the jitter and BLER are measured during a rotation and the average is calculated. "Correction Pointing Pre-Sense Correction. Figure 6 is a schematic illustration of a complete optimal power control procedure for a parametric disc as a function of disc radius. The program includes: i) β - OPC; ii) Jitter &BLER_OPC; m) Forward Sensing Correction; 乂 and IV) Write Check. Actually 'Introducing a beta correction to compensate for the laser: optical feedback. To find out what should be used Correction, the reading of the forward sensing peer is written to a blank area on the disc. Therefore, the actually determined optical (four) ECC blocks are written to the internal disc job area. For these 1.5 ECCI1 blocks Reading forward sensed values. Based on this value, a corrected beta value is calculated based on the measured drop. The delta difference between the corrected (four) value and the measured (iv) value 125644.doc 200837733 should be in a particular window (eg Within 1%), otherwise a retry is performed until the delta difference is within the allowable window. Figure 4 is a graph illustrating the use of the steps outlined above for a preferred TDK R8x DVD+R disc. An example of the result of this jitter, block error rate (vertical axis) pin These test power values (horizontal axes) are plotted. These squares indicate the measurement results. It should be clear to those skilled in the art that any function γ(χ) with a minimum value for X=Xm is small around this minimum. Within the range, Y(X)=c〇+c1(X-Xm)+c2(X.Xm)2 can be reasonably approximated by the quadratic function of the following equation, where C0, 4 and 4 are constants. The measurement is effective to find the best value for X ▲. It is done by the well-known least squares method, which is not required to be explained here. In any case, those skilled in the art should be aware that it can be based on Several measurements around the minimum of a function are used to calculate an optimal parabolic fit, and thus can be calculated and approximated. The curve shown in Figure 4 illustrates this parabolic fit. Using x (jitter/BLER) and For the correction data of Y (test power value), the coefficients Co, Mc2 can be calculated. After calculating the coefficients c, 〇1 and .2, the point 4 is calculated and the first recording power of the radiation beam is set to correspond to One of the minimum jitter values is the best value. On the same line, the second recording power of the radiation beam is set. The optimum value corresponding to the minimum block error rate (BLER) is determined. Further, as explained in the specific embodiment, the optimal recording power is determined by using the first recording power and the second recording power of the radiation beam. The decision of the minimum jitter or block error rate (BLER) is based on a polynomial response, and thus the best recording power of 125644.doc -10- 200837733 is accurate and reliable. (4) Determining the radiation beam rate and the second recording power of the radiation beam. ^力应思思, the BLER measurement should be compared with the jitter rate during a disc rotation. At the same time, the occurrence occurs to compensate for such things as centrifugation &gt; + move "BLER 〇 pc to reduce the overall Ο PC. In - Korea 66 SL · X people 1. ^ sentence can filter out random measurement noise and can also filter out the disk The disc deviation and the periodic disturbance of the turntable motor swing. In another specific real towel, the test data is recorded on the record carrier for each change of the test power value to have from the center of the record carrier to the One of the record carriers, the outer edge, the edge of the picking edge, and the concentric circle of the radius, the test negative material. Due to the change in the thickness of the material, the manufacturing change) "two (= dust, fingerprint, scratch, dye, _ text) Due to changes in clothing environment, dynamic power calibration is required to compensate for the good recording quality of Demo found in your records. This ensures that in another embodiment, across the entire record carrier, for each of the test power values - The change to record the test data on the == carrier includes a concentric circle recording test having a radius reduced from the center of the record carrier other than the record carrier = more ensuring good recording quality across the entire record carrier and complementing The media, such as the θ(4) move 111GG, may be adapted to perform a method for determining a good recording power for a person recorded on the record carrier i as disclosed in the specific embodiment. For this purpose, the control unit 24 is based on The material=° recorded power determining unit 24A is configured to determine the first-recording power of the soil, &amp; radiation beam. The control unit 24 further comprises a second recording power determining unit 24B, step 125644.doc 200837733, The system is configured to determine a second recording power of a radiation beam based on a block error rate (BLER). The control unit 24 further includes an optimal recording power determining unit configured to determine the radiation beam based on the radiation beam The optimum recording power of the radiation beam of the difference between the first recorded power and the radiant power of the radiation beam. One of the recorders 100 can perform optimal power calibration and, as such specific embodiments The disclosed method determines the optimum recording power of the radiation beam, thereby improving the overall recording performance of the recorder. Although the present invention has been described by using a specific embodiment of a DVD disc. However, the subject matter of the present invention is applicable to all types of record carriers, for example, one-person write media and multiple-write recordable types (Dvd-RW, DVD+RW, Blu-ray disc). It is not limited to one-sided and two-layer. Record carrier (ie double-layer record carrier) or double-sided record carrier (ie double-sided double-layer record carrier). Those skilled in the art can implement the decision to record data in software or in both hardware and software. The specific embodiments of the method for optimally recording the power of a radiation beam. Those skilled in the art to implement the claimed subject matter will be able to understand and practice other embodiments of the disclosed embodiments. The use of the verb "comprise" does not exclude the existence of a component that is not mentioned in the scope of the patent application or the description. The use of the indefinite article "a" or "an" The drawings and description are to be considered as illustrative only and not limiting. BRIEF DESCRIPTION OF THE DRAWINGS Other aspects, features, and advantages of the present invention are further described by way of example only with reference to the accompanying drawings.

Or a similar part, and wherein: Figure 1 is a schematic representation of an exemplary driver; Figure 2 is a schematic illustration of the laser power plotted against the motion and block error rate (BLER) of an exemplary TDK-R8X DVD+R disc. ',' Figure 3 shows an exemplary flow chart illustrating the steps of a method for determining the optimum recording power of a radiation beam in accordance with the teachings of the present invention;

4 is a non-intentional illustration of the results obtained for an exemplary R8X DVD+R disc in accordance with the teachings of the present invention; a deliberate interpretation of the selection of an exemplary power calibration range in accordance with the teachings of the present invention; and a broad view of FIG. A complete optimal power control program for an exemplary dvd+r/_r disc that is functionally related to the disc. 7 A record carrier (e.g., a DVD) comprises a continuous spiral form or a plurality of at least one magnetic track of the same circular shape, wherein the poor material can be stored in the form of a data pattern. The record carrier can be a recordable (8) or rewritable (RW) type that can store or record information such as DVD+RW, dvd rw, DVD+R, BD_RE (single layer and multi-layer). A beam of radiation, such as a laser beam, is typically used to record information. Figure 1 is a block diagram showing the structure of an exemplary driver. A record carrier 10 is controlled by a constant yaw rate (CAV) control or a constant linear velocity (CLV) by a glaze motor 12. An optical pickup unit 14 records data on the record carrier 1 by using laser light (at a recording power value) emitted from the -t diode. When the information is recorded, the data to be recorded is supplied to an encoder unit 18 and the data encoded by the encoder unit 1S is supplied to a laser diode driving unit 16. . The laser diode driving unit 16 generates a driving signal based on the encoded data and supplies the driving signal to the laser diode of the optical pickup unit. Further, a control signal from a control unit 24 is supplied to the laser diode driving unit 16 to determine the recording strategy and recording power by the control signal. On the other hand, when reading data, the laser diode 10 of the optical pickup unit 14 emits a laser beam of read power (reading power <recording power), and receives reflected light converted by the reflected light. An electrical signal is obtained to obtain a radio frequency (radio frequency) signal. The reading ruler? The signal system is supplied to an RF signal processing unit 2A. The RF signal processing unit 20 includes an equalizer, a binarization unit, a phase locked loop (PLL) unit, and binarizes the read RF signal to generate. The clock is synchronized and the signals are supplied to the decoder unit 22. The decoding φ 1 unit 22 decodes the data based on the signals supplied and outputs the decoded data as read data. A read RF signal from the RF signal processing unit 2 is also supplied to the control unit 24 for evaluating the read signal quality. The driver 1A further includes a circuit (for a billing item) for controlling the tracking signal or a focus error signal and a wobble signal formed on the record carrier 1 to generate the tracking signal Focus servo red tilt # hm , ^ is called version tracking servo (for example, for address demodulation or for controlling the number of rotations). However, (4) The control structure of the county is the same as that of the conventional drive system, and therefore will not be described in detail. 125644.doc -14- 200837733 When the record carrier 1 is to be recorded on the record carrier, the test data is repeatedly recorded in the predetermined area (ie, the power calibration area) of the record carrier 10. The recording power is also changed at the same time. The test data is replayed and the recording power at which the quality of the reproduced signal is maximized is selected as the optimum recording power. Use the best, the force rate to record the data (generally called one of the best power control (OPC) program. The control is early 70 24 by driving the laser diode drive unit 16, evaluating the recorded test data. The quality and determines the optimal recording power to perform the optimal power control (〇PC) procedure. The method disclosed in S 2003/0053386 uses the error rate to determine whether the jitter-based calibration write power is abnormal. Write power, which is higher than the predetermined level, even if the jitter is small, the calibration point is abnormal and is not used to determine the optimal write power. In other words, the error rate is used to determine the jitter power. The effectiveness of the calibration point. This mosquito with the best write laser power results in a better jitter %HF recording quality. However, a better/lower jitter HF signal will still have a readback problem due to a very high Due to the regional ghost error rate (BLER), which can be obtained by the record carrier

cause. And I generally say that the minimum jitter point corresponds to the minimum block error rate (BLER). But 'for a particular record carrier that is usually sensitive to recording power (for example, and there are two discs, such as BLERb, meaning the block error rate of the record and indicates the pre-pit signal in the record before recording The amount of error 'and Rb means the groove reflectivity before recording)) 'The most moving point can be far from the minimum BLEU. The laser power plotted for this jitter and material (BLER) is shown. The vertical axis shows the jitter and the value of the horizontal axis shows the laser power values. The record carrier considered here is a poor TDK-R8x DVD+R disc. As can be seen from Figure 2, the minimum jitter does not correspond to the minimum BLER value. Using laser power corresponding to low jitter for recording data will result in recording and reproduction problems. [Main component symbol description]

10 Record carrier 12 Spindle motor 14 Optical pickup unit 16 Laser diode drive unit 18 Encoder unit 20 RF signal processing unit 22 Decoder unit 24 Control unit 24A First recording power decision unit 24B Second recording power decision unit 24C Good recording power decision unit 100 driver I25644.doc •16-

Claims (1)

200837733 Patent Application Range: 1. A method (300) for determining an optimum recording power of a "beam" for recording a material on a record carrier (10), the method (300) comprising: determining the radiation based on jitter a beam-first-recording power (302); determining a second rate (304) of the radiation beam based on a block error rate (bler); and determining a first recording power based on the radiation beam and the The method of claim 1, wherein the first recording power of the light beam is based on the difference between the second recording power of the radiation beam: (306) The method of claim 1, wherein the first recording force based on the light beam is determined The optimum recording power of the light beam of the difference between the rate and the second recording power of the radiation beam comprises determining the optimum recording power of the radiation beam based on the k-segment difference. 3. The method of claim 2, wherein the calibration step is determined based on a resolution of the power of the bundle for recording data on the record carrier ((7)). 4) The method of claim 2, wherein the optimal recording power of the radiation beam based on the calibration step comprises: the first recording power and the radiation of the beam Whether the difference between the second = rate of the bundle is true w (four) step difference; right: whether the block error rate (bler) count of the first recording power of the light beam is higher than The second recording power block error rate (BLER) count of the light beam is large - a predetermined number of counts; and the right side selects the second recording power of the radiation beam as the best of the radiation 125644.doc 200837733 Record the power. 5. The method of claim 4, further comprising: recording the data on the determined body (10) of the radiation beam. ^ Recording power is recorded in the record. 6. The method of claim 1 is directly changed by A &amp; 第 the first recording power contains ^, the jitter of the ray of the ray allows the test power value to be changed within the range The record of the radiation beam is for each of the test power values - compared to the test data;) the private version of the test data is read and measured; and the line is fitted with the corresponding power values and corresponding Measure the jitter value; and rate. The first recorded work of the radiation beam to the jitter is substantially the same as the method of claim 6, wherein the recording of the test data on the record carrier for each change of the test power value comprises: The test data is recorded by concentric circles of the center of the record carrier to the increased radius of the outer edge of one of the record carriers. The method of claim 1, wherein the determining the second recording power of the radiation beam based on the block error rate ^(8) comprises: changing the recording power of the radiation beam within a test power value; Each of the power values—changes to record the test data on the record (IV); 125644.doc 200837733 Block error rate (bier); The test block of the stomach should read the test data of the record and measure the curve fit The test power value and the rate (Mer) value; and finding the block error rate (b) er). 9. The method of claim 8, wherein the method of claim 8 wherein the test data is recorded on the record carrier for each change of the test power value comprises: having the exterior from the record carrier The test data is recorded by the concentric circles of the radius of the ~/ Γ 1 to the record carrier. 10. The method of claim 1, wherein the first of the eight is equal to the first recording power of the radiation beam and the second recording power of the radiation beam. 11. The method of clause 7 or 9, wherein the recording of the test data on the record carrier for each change in the test power value comprises: recording the test data on a DVD. 12. The method of claim 6 or 8, wherein the test data of the C record is included in the test record of the C record, and the test data recorded on a DVD is taken. 13. A driver (100) comprising: a learning pick-up unit (14) configured to generate a radiation beam and focusing the light beam on a record carrier (10); _ 1 unit (24) 'The g& is configured to control the optical pickup unit 70, wherein the control unit further includes a recording power determining unit (24A) configured to determine the yaw based on the jitter a beam-first recording power; 125644.doc 200837733 - a second recording power decision unit (24B) configured to determine a second recording power of the one of the radiation beams based on a block error rate (bler); An optimum recording power decision unit (24C) configured to determine; "the beam of light of the difference between the recorded power of the light beam and the second recording power of the radiation beam" The optimum recording power, such as the driver (1 〇〇) of claim 13, wherein the optimum recording power decision unit (24C) is further configured to determine the optimum of the radiation beam based on the calibration step difference Record the power. 15. The driver of claim 14 ( 1)) wherein the calibration step is determined based on the resolution of the radiation beam used to record data on the record carrier (10). 16. The driver (100) of claim 14, wherein the Preferably, the recording power determining unit (24C) is further configured to: determine whether the difference between the first recording power of the radiation beam and the second delta recording power of the radiation beam is substantially greater than two calibration step differences And if so, determining whether the block error rate (bier) count at the first recording power of the radiation beam is greater than the block error rate (BLER) count at the second recording power of the radiation beam The number of counts; and if so, the second recording power of the radiation beam is selected as the optimum recording power of the radiation beam. 17. The driver (100) of claim 13, wherein the radiation is determined based on the jitter The first recording power determining unit (24A) of the first recording power of the bundle is further configured to: change the recording of the radiation beam within a range of allowable test power values 125644.doc 200837733 Each test data for the test power value; t further records the test data of the record on the brother record body and measures the jitter; and 2-line fitting the test power values corresponding to the Measuring the jitter value; finding the first recorded work of the radiation beam that is substantially minimized by the jitter The driver _) of the requester 3, wherein the second recording power determining unit (24Β) for determining the second recording power of the radiation beam of the base (four) block error is further configured to be used for Changing the recording power of the light beam within one of the power values; recording the test data on the record carrier for each change of the test power value; reading the recorded test data and measuring the block error rate ( Mer); curve fitting the test power values to the corresponding measurement block error rate (bier) values; and finding the radiation beam of the block having a substantially minimum error rate (bier) power. 19. The drive (100) of claim 13, wherein the drive is a dvd drive. 20. A recorder comprising a drive as claimed in claim 19. 21. The recorder of claim 20, wherein the recorder is a DVD recorder. 125644.doc 200837733 22. A computer program comprising: a component for recording data on a record carrier for performing a decision for use in a method comprising a first recording of an optimal recording power of a beam Recording power; a second recording power of the light beam determines a rate based on a block error rate (bler) based on the jitter of the radiation beam; and determining the first ^ ^ ^ ° based on the light beam Recording power and the radiation beam The optimum recording power of the radiation beam, which is a difference between the second recording powers. 125644.doc