CN101034564A - Optical disk drive - Google Patents
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- CN101034564A CN101034564A CNA200710079996XA CN200710079996A CN101034564A CN 101034564 A CN101034564 A CN 101034564A CN A200710079996X A CNA200710079996X A CN A200710079996XA CN 200710079996 A CN200710079996 A CN 200710079996A CN 101034564 A CN101034564 A CN 101034564A
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Abstract
In an optical disk drive, running OPC (ROPC) is performed without fail, to thus enhance recording quality. ROPC is performed by use of a remaining portion of an area for APC operation within an APC area of a recording unit (RUB) in a next-generation optical disk such as a blu-ray disk. ROPC is performed by means of tentatively writing test data having a length of 50 T longer than a specified length of data to be recorded; and detecting level B of the amount of light reflected at that time. The APC area is formed from five wobble periods. APC is performed in periods of first two wobbles, and ROPC is performed in remaining three wobble periods.
Description
Priority information
The application requires the right of priority of following application: Japanese patent application 2006-62998 number, be filed on March 8th, 2006 and Japanese patent application 2006-63002 number, and be filed on March 8th, 2006, its full content is incorporated herein by reference.
Technical field
The present invention relates to a kind of CD drive, more specifically, relate to the recording laser beam power and regulate.
Background technology
ROPC (operation OPC) so far in use always, it is used for detecting in the recording process of the real data catoptrical amount from CD, so that increase or reduce the power of recording laser bundle thus according to catoptrical amount, and combine record test data and reproduce this test data so that the OPC technology of optimum recording power is set according to the quality of reproducing thus, wherein record test data is to be undertaken by the power that changes the recording laser bundle when at the CD identifying recording layer in the presumptive test zone of CD in every way.
By means of ROPC, come detection level B part by sampling, in this part, form the hole by the recording laser bundle, and in data recording process among the catoptrical amount, must stablize from the catoptrical quantitative change in described hole; And increase or reduce the power of recording laser bundle according to the value of horizontal B.For example, suppose that the power of recording laser bundle is taken as P, the value of horizontal B is taken as B, then regulates the power P of recording laser bundle, so that make B/P
nBecome constant, wherein, for example, the value of " n " is made as 2 or other value.
Consider to make the partially stabilized needed time of horizontal B, or consider filter range etc. that horizontal B part is preferably sampled by the hole with the longest possible data length.For example, under the situation of DVD, catoptrical amount is sampled into the data length of 9T to 11T, 14T or the like, thereby obtains the value of horizontal B.
Japanese Patent Laid-Open Publication has been described a kind of CD drive 2002-157738 number, it makes dish with constant angular velocity rotation, wherein, dish has test and writes zone, buffer area, introducing (lead-in) zone, program area and draw (lead-out) zone from interior rail to outer rail.This publication has been described: test signal is recorded in to be positioned to test and writes the zone and draw extra-regional outer peripheral areas, and the test signal that writes down like this is reproduced, so that the value that laser is exported is set thus.
By ROPC, detection level B when data are recorded in the longest hole that may length.Yet in response to the request that increases data recording speed, the absolute time of recording impulse shortens.Even the hole of long data length is noted, the horizontal B of stable detection can run into suitable difficulty.
When the type change of CD, also suppose such situation, promptly there is not hole than long data length.For example, in a kind of CD blu-ray of future generation dish, maximum data length is 8T, even and synchronizing signal also only has the data length of 9T, so detection level B can run into bigger difficulty." look back (recalling) method " also is that the crowd knows that it may further comprise the steps: interrupt the record of data during recording operation, assessment is and then in the quality of recorded data before, and regulates the power of recording laser bundle according to the result of assessment.When by assessment and then in the quality of recorded data before and by utilizing β value, γ value, when error rate is regulated the power of recording laser bundle, being necessary to know mode with respect to increase or reduce the power of recording laser bundle such as evaluate parameters such as β value, γ values; That is, be necessary accurately to determine the power of recording laser bundle and the relation between the evaluate parameter.These knowledge can be obtained at the test zone of pending OPC.The zone of the test zone of pending OPC and record real data is different with regard to the sensitivity of record usually.Accurately the power of regulating the recording laser bundle can be met difficulty.
Summary of the invention
The invention provides a kind of CD drive, it does not consider the short data length of CD of future generation, realizes the increase of data recording speed or guarantees recording quality by the power of regulating the recording laser bundle.
The invention provides a kind of CD drive, be used for coming record data at each booking situation piece, wherein,
Record block comprises user data area;
CD drive comprises
The irradiation unit that is used for radiation recording laser bundle; And
Controller, the presumptive area radiation recording laser bundle of its non-user data area in record block, so that tentatively write the test data with predetermined length thus, and it regulates the power of recording laser bundle according to the catoptrical amount that is realized during tentative writing; And,
The power of recording laser bundle during data recording at each booking situation piece re-adjustments.
According to the present invention, the presumptive area of the non-user data area of ROPC in record block is carried out, so that guarantee recording quality by the execution that guarantees ROPC.Especially, owing to utilize all the other zones in the APC zone and utilize the test data longer, also increased writing speed than the specified length of data to be recorded.
And, the invention provides a kind of CD drive, be used for coming record data at each booking situation piece, wherein,
Record block comprises user data area;
CD drive comprises
The irradiation unit that is used for radiation recording laser bundle; And
Controller is used for regulating recording power by interrupt data recording during record data; And,
Described controller tentatively writes test data by the power in the presumptive area of the non-user data area of change record block when data recording is interrupted, and regulates the power of described laser beam according to quality of signals and the relation between the power that the test data that tentatively writes by reproduction is obtained.
According to the present invention, data are interrupted during being recorded in record data, thereby can regulate recording power accurately.
By reference following examples, will make the present invention obtain understanding more clearly.Yet scope of the present invention is not limited to this embodiment.
Description of drawings
To describe a preferred embodiment of the present invention in detail with reference to following each figure, wherein:
Fig. 1 is the The general frame of the CD drive of an embodiment;
Fig. 2 is the block diagram of the major part of CD drive;
Fig. 3 is the descriptive view of Write strategy;
Fig. 4 is a sequential chart of carrying out APC and ROPC;
Fig. 5 A is the sequential chart of carrying out ROPC to 5C;
Fig. 6 is the curve map that the relation between recording power and the reflectance is shown;
Fig. 7 is the line chart that the relation between CD radius and the ROPC ratio is shown;
Fig. 8 is the descriptive view of the data structure of blu-ray dish;
Fig. 9 is the block diagram of another major part of CD drive;
Figure 10 be tentatively write test data by the descriptive view of recording pulse signal;
Figure 11 A is the waveform (and waveform of signal (sum signal)) of reproducing signal and the sequential chart of detection waveform to 11D;
Figure 12 is the curve map that the relation between power and the β value is shown;
Figure 13 is another curve map that the relation between power and the β value is shown;
Figure 14 is the diagrammatic sketch of another major part of CD drive;
Figure 15 is the descriptive view of another data structure of blu-ray dish.
Embodiment
With reference to described accompanying drawing, one embodiment of the present of invention are described following.
Fig. 1 is the block diagram of overall light disk drive according to an embodiment of the invention.Spindle Motor (SPM) 12 drives the CD 10 that makes it possible to record data with rotation mode, as DVD, CD of future generation (blu-ray) etc.Spindle Motor SPM 12 is driven by driver 14, and driver 14 is by servo processor 30 servocontrol, so that realize needed rotating speed.
During recorded data, the laser beam of reproducing power is from the LD emission of optical pickup apparatus 16 on reproducing CD 10; The light that is reflected by CD 10 converts electric signal to by PD; And electrical signal converted is provided to RF circuit 26 like this.RF circuit 26 produces focus error signal and tracking error signal according to reproducing signal, and supplies with the signal that produces like this to servo processor 30.According to these error signals, servo processor 30 servocontrol optical pickup apparatus 16, thus make optical pickup apparatus 16 remain on state and track alignment in focus.RF circuit 26 is supplied with the address signal that is contained in the reproducing signal to address decoding circuitry 28.Address decoding circuitry 28 demodulates the address date relevant with CD 10 from address signal, and supplies with the address date of such demodulation to servo processor 30 and system controller 32.
An example of described address signal is swinging signal (wobble signal).The modulation signal of the temporal information by expression CD 10 specific address makes the track swing of CD 10.Resulting swinging signal extracts from reproducing signal, and the swinging signal that extracts like this is decoded, so that can obtain address date (ATIP).The RF signal that RF circuit 26 will reproduce like this supplies to binarization circuit (binarization circuit) 34.Binarization circuit 34 is with the RF signal binaryzation of reproducing, and the signal that will as a result of obtain is presented to encoder/decoder circuitry 36.The signal of the described binaryzation of encoder/decoder circuitry 36 demodulation; The error of correction in the signal of demodulation is so that obtain the reproduction data thus; And will reproduce data by interface I/F 40 and output to main frame such as personal computer.When reproducing data and output to main frame, encoder/decoder circuitry 36 will reproduce data temporarily be stored in memory buffer 38 after with its output.
When data were recorded on the CD 10, the data to be recorded that send from main frame supplied to encoder/decoder circuitry 36 by interface I/F40.Encoder/decoder circuitry 36 with data storage to be recorded in memory buffer 38; With digital coding to be recorded; And such coded data is fed to writes strategy circuit 42.Write strategy circuit 42 and modulated data-switching is become multipulse signal (train of impulses) according to the booking situation strategy; And multipulse signal supplied to driver 22 as record data.Because Write strategy influences recording quality, Write strategy is fixed in certain optimal strategy usually.By the LD emission from optical pickup apparatus 16 of the laser beam of record data modulation, data are recorded on the CD 10 power thus.After the record data, the laser beam of optical pickup apparatus 16 emission reproducing power is so that the data of reproducing recorded thus; And to RF circuit 26 supply reproduction data.RF circuit 26 is supplied with reproducing signal to binarization circuit 34, and the data of binaryzation are supplied to encoder/decoder circuitry 36.36 pairs of modulated data of encoder/decoder circuitry are decoded, and contrast the such data of decoding of record data verification that memory buffer 38 is stored.The result of verification supplies to system controller 32.According to the result of verification, system controller 32 determines whether to continue record data or carries out blocked operation.
The operation of system controller 32 control total systems; Particularly, carry out OPC and ROPC.By means of OPC, by progressively changing the test zone that recording power tentatively writes on test data CD 10; Reproduce the test data that tentatively writes; And the β value of measurement reproduction data, γ value, degree of modulation, error rate etc.Selection makes the quality of reproducing signal such as error rate etc. reach the recording power of expectation value and gets it and is optimum recording power Po.System controller 32 Control Driver 22 are so that realize selected recording power Po.System controller 32 is also carried out ROPC.By means of ROPC, the value of the horizontal B that is realized when forming the hole by the recording laser bundle is sampled as mentioned above, and according to the value Control Driver 22 of the horizontal B that obtains like this, thereby increase or reduce recording power.
By the example of blu-ray, below describe the ROPC that treats by system controller 32 is carried out and handle as CD 10.
Fig. 8 illustrates the data structure of blu-ray.Data are managed on the basis of every recording unit block (RUB).Single RUB comprises that the operation of 2760 channel bit (cbs) goes into district (Runin district); The physical cluster of 496 * 1932 channel bit (Physical Cluster); Go out district (Runout district) with the operation of 1104 channel bit.Physical cluster is a user data area.Moving district, physical cluster and moving out in the district, the top is moved into the district and is provided with the APC zone.This APC zone is corresponding to five swings (that is, 5 * 69 channel bit), and APC carries out by using this zone.Here, term " APC " expression: the drive current of regulating the feasible light emission measure that can obtain to want by the relation between calculating electric current (i) and the light emission measure (L), because the light emission characteristics of laser diode (LD) demonstrates temperature dependency, even and the light emission measure under identical drive current, also can change.Carry out following processing by utilizing the APC zone: detect the light emission measure by means of changing drive current in every way; Calculate the relation between electric current and the light emission measure; And calculate to make realize the drive current of the light emission measure wanted.For example, drive LD, detect the light emission measure of being realized this moment by near the light receiving element (preceding monitor) that is positioned at the LD at 5mW and 15mW; Learn or proofread and correct the i-L characteristic of LD.Although guaranteed the APC zone corresponding to five swings as mentioned above, yet actual learn or proofread and correct the i-L characteristic need be corresponding to the APC area size of five swings, and the remainder in APC zone still keeps not using.
In the present embodiment, untapped part is noted, and by utilizing the untapped remainder in the APC zone to carry out ROPC.For example, among five hunting periods in APC zone, be used for APC two hunting periods; Be used for ROPC remaining three hunting period, or the like.In the blu-ray dish, the data of 2T to the data length (reaching the data length of 9T when comprising synchronizing signal) of 8T only appear having.Yet, because arbitrarily test data can tentatively write on the APC zone, have test data, as have the test data etc. of the data length of 50T greater than the data length of 9T, when carrying out, ROPC tentatively write, thus detection level B.
Fig. 2 illustrates the configuration of major part, and this part is carried out APC and ROPC in the APC zone of recording unit block RUB.Except comprising LD, quadruple photo-detector PD, object lens, object lens driving circuit (driving circuit is used for producing drive actions in focus direction and at tracking direction) etc., optical pickup apparatus 16 also has the driver (LDD) 22 that is used to drive LD and is positioned near preceding monitor (FMT) 16b that LD is, detect the emission light quantity of LD.Preceding monitor 16b converts the emission light quantity of LD electric signal to and this electric signal is outputed to system controller 32.
Quadruple photo-detector detects the amount (amount of back light) of the light that is reflected from the intrafascicular CD 10 of LD emitted laser, and supplies with the catoptrical amount that is detected to low-pass filter LPF 44.
Low-pass filter 44 is eliminated the high fdrequency component that is contained in the reflected light signal as noise; And the reflected light signal that will remove noise supplies to sampling hold circuit S/H 46.For example, described high fdrequency component comprises: the modulation product of the Write strategy that is attributable to during record data to be taked.In the present embodiment, the test data experience sampling with long data length of 50T etc. keeps, and therefore the cutoff frequency fc of low-pass filter 44 does not need to be set to high level.Sampling hold circuit S/H 46 makes that sampling keeps from the signal of low-pass filter 44 experience, so that the horizontal B of detection of reflected light quantity thus; And the horizontal B that will detect like this supplies to system controller 32.The sampling of sampling hold circuit S/H 46 keeps sequential to be provided by encoder/decoder circuitry 36.Encoder/decoder circuitry 36 receives the timing control signal Tapc in the APC zone of indicating recording unit block RUB as input from formatter or timing sequencer; And determine the initial timing in APC zone according to this signal.Encoder/decoder circuitry 36 is supplied with clock signal to system controller 32, and by this clock signal, APC carried out in two hunting periods; And supply with the stop timing signals of two hunting periods, the i.e. initial timing signal of ROPC to system controller 32 and sampling hold circuit S/H 46.According to from the initial timing signal of the ROPC of scrambler 36, sampling hold circuit S/H 46 keeps the sampling of catoptrical amount experience, so that detection level B thus.As mentioned above, horizontal B has formed and value that catoptrical amount has become and realized when stablizing in the hole; And be defined as since the initial timing of ROPC, the value through being realized after the predetermined amount of time.
According to the clock signal from formatter or timing sequencer output, encoder/decoder circuitry 36 is supplied with recording pulse signal to driver 22, so that carry out APC and ROPC in the APC zone.In addition, supply with the recording pulse signal that driver 22 is followed the booking situation strategy, so as in physical cluster user data.Employed example record strategy when Fig. 3 is illustrated in user data.Described Write strategy comprises top pulse Ttop, follow-up multiple-pulse Tmp and final pulse Tlp.Described Write strategy changes in every way according to following: the pulsewidth of the pulsewidth of top pulse Ttop and impulse level (Pw), multipulse number and impulse level (Pb), final pulse Tlp and impulse level (Pw), and the pulsewidth (Ts) and the impulse level (Pc) of the pulse that is in the end realized after the pulse Tlp.Although top pulse Ttop, multiple-pulse Tmp and final pulse Tlp are superimposed upon on the bias level Ps, bias level Ps is set to reproduce level or wipes level.When the length of data to be recorded is 2T, only have top pulse Ttop, and multiple-pulse Tmp and final pulse Tlp are non-existent.When the length of data to be recorded is 3T, have top pulse Ttop and final pulse Tlp, and multiple-pulse Tmp is non-existent.When the length of data to be recorded was nT (" n " be four or greater than four), top pulse Ttop, multiple-pulse Tmp and final pulse Tlp existed, and Write strategy is defined as
Ttop+(n-3)×Tmp+Tlp
When carrying out OPC, Write strategy can be fixed maybe and can optimize.
In the time should writing down real data, follow above Write strategy and operate.Yet when carrying out APC, basic demand is to drive driver 22 by the individual pulse signal.And, when carrying out ROPC, can use strategy arbitrarily, because test data tentatively writes.In the present embodiment, encoder/decoder circuitry 36 treats that by employing the Write strategy that uses tentatively writes test data during the record real data, so that carry out ROPC thus.Like this, there is not fault ground to guarantee the validity of ROPC.Particularly, in order to write down test data, tentatively write test data by the Write strategy that is defined as Ttop+47 * Tmp+Tlp in accordance with above expression formula with 50T length.
In response to the clock signal from encoder/decoder circuitry 36, system controller 32 Control Driver 22 are so that carry out APC and ROPC in the APC zone.In ROPC, carry out following processing.Particularly, at first carry out OPC,, and tentatively write test data with 50T length with set optimum recording power Po so that optimum recording power Po is set thus at the blu-ray test zone.This moment, the horizontal B (note is made Bo) of the reflection light quantity that obtained was detected and be stored in the storer.Recording power Po that obtains like this and the value Bo of horizontal B form combination under desirable record condition.During the record real data, the value of horizontal B is sampled, and regulate recording power P so that make Bo/Po
n=B/P
nBecome constant.Recording power P also can regulate by Po, Bo and the B that obtains like this by another kind of method.For example, B/P
nCalculate according to current recording power P and the horizontal B that is obtained, and the B/P that will calculate like this
nWith Bo/Po
nRelatively.According to comparative result, current recording power P also can (for example, ± 0.2mW) increase or reduce given amount.
Fig. 4 illustrates APC and ROPC pending sequential in the APC zone.APC zone 100 is present in the top of recording unit block RUB, and APC zone 100 is divided into two zones; That is, be used for the zone (after this being called " APC operating area ") of APC operation and be used for the zone (after this being called " ROPC operating area ") that ROPC operates.At the APC operating area, as described, LD drives by two power source P1 and P2.The amount of the light that launched this moment detects by preceding monitor 16b, so that obtain the i-L characteristic thus.Make the drive current of realizing expectation light emission measure according to the i-L property calculation of obtaining like this, and LD drive by the drive current that calculates like this.The i-L characteristic of LD fluctuates under Temperature Influence.Therefore, be necessary on the basis of every RUB, to carry out APC, so that always proofread and correct thus or calibration i-L characteristic.As mentioned above, the test data with length of 50T is recorded in the ROPC operating area, and the sampling of catoptrical amount experience keeps in that test data is tentative during writing, so that detection level B thus.Have the result of test data of the length of 50T as employing, the low-pass filter 44 of reflected light signal by having enough low frequency band thus, can be removed noise fully from multipulse signal.For example, under the situation of the channel bit rate of 66MHz, 50T is corresponding to 0.76 μ s, and thus, the cutoff frequency fc of low-pass filter 44 can be reduced to the value of 1.32MHz.Accompanying drawing illustrates catoptrical waveform (waveform of back light), passed through the waveform of the light of low-pass filter 44, and the sampling of sampling hold circuit S/H 46 keeps timing waveform.Although the modulation product of Write strategy is superimposed upon on the catoptrical waveform, should understands modulation product and remove by low-pass filter 44.
As mentioned above, ROPC carries out in the APC zone that occurs with preset frequency, and data are record when recording power increases or reduces.As described, ROPC the term of execution, horizontal B also can detect by tentatively writing the test data that only once has the length of 50T.Yet, when APC zone 100 corresponding to five hunting periods, and when distributing to ROPC three hunting periods, can guarantee 3 * 69=207 channel bit.Therefore the test data that has the length of 50T can tentatively be write four times rather than only once.Thereby, as in the following cases, promptly when carrying out OPC, progressively changing under the situation of recording power in the presumptive test zone, the test data with length of 50T also can tentatively write when changing recording power with multistep, so that carry out ROPC thus.
Fig. 5 A illustrates the sequential chart that obtains when tentatively writing the test data of the length with 50T by the sequence change recording power with P4, P5, P6 and P7 to 5C.Fig. 5 A illustrates the waveform of recording pulse signal, and the Write strategy that wherein is used for tentatively writing the test data of 50T repeats four times.The waveform of the light (back light) that Fig. 5 B illustrates at that time to be reflected, wherein the waveform of the signal by low-pass filter 44 is represented with solid line in the drawings.The sampling that Fig. 5 C illustrates sampling hold circuit S/H 46 keeps sequential.Respectively comprise recording power and horizontal B value altogether four groups obtain by following: carry out the processing that is used for tentatively writing the test data of 50T altogether for four times and the sampling of reflected light experience is kept.These group notes are made (P4, B4), (P5, B5), (P6, B6) and (P7, B7).Carry out ROPC in order to utilize these to make up, reflectance R=B/P is calculated.Particularly, R4=B4/P4, R5=B5/P5, R6=B6/P6 and R7=B7/P7 determine by calculating.And the relational expression between reflectance R and the recording power is calculated.Fig. 6 illustrates the relation between recording power P and the reflectance R.System controller 32 according to the relation between recording power P and the reflectance R calculate f (Px, Rx).Ideally-reflecting than Ro according to OPC the term of execution ideal relationship that obtained (Po Bo) calculates.This ideally-reflecting than Ro by substitution relational expression f (Px, Rx) so that can obtain for the desirable recording power in the position of pending ROPC.ROPC handles and is summarized as follows.
(1) carries out OPC at the test zone of blu-ray dish, and tentatively write the test data of 50T, so that detection level B thus with optimum recording power Po.Determine that (Po, Bo), it is the combination of the value Bo of desirable recording power Po and horizontal B in combination.
(2) according to (Po Bo) determines that ideally-reflecting compares Ro=Bo/Po.
(3) when after APC is carried out in APC zone, when changing recording power, repeat the test data that test of many times ground writes 50T, and detect the horizontal B that is realized each time with multistep, thus the combination of definite recording power P and horizontal B.
(4) determine reflectance R according to the combination of recording power and horizontal B.
(5) calculate relational expression f between recording power and the reflectance (Px, Rx).
(6) calculate recording power according to ideally-reflecting than Ro and relational expression " f ", thereby increase or reduce current record power.
In the present embodiment, because ROPC repeats in the APC zone, recording power can always be adjusted to optimal value.In addition, have the test data that reaches 50T length by utilization and carry out ROPC, therefore also can increase writing speed.
In the present embodiment, in five hunting periods, be used for the APC operation two hunting periods, be used for the ROPC operation remaining three hunting period.Yet, can be provided with arbitrarily; For example, distribute to the APC operation three hunting periods, distribute to the ROPC operation all the other two hunting periods, or the like.Also can adaptively change with the ratio of the hunting period that is used for the ROPC operation hunting period that is used for APC operation, with adapt to each CD or or even monochromatic light dish situation under adapt to each radial location.For example,, distribute to the APC operation three hunting periods, distribute to the ROPC operation two hunting periods at interior rail.And, distribute to the APC operation two hunting periods at outer rail, distribute to the ROPC operation three hunting periods.Because at interior rail the chance that applies in good condition by the set optimum recording power Po of OPC is arranged, can distribute to APC and not relate to the ROPC operation five hunting periods at interior rail.The necessity of ROPC is usually along with to the increase of the distance of outer rail and increase.Therefore, consider the execution precision that strengthens ROPC, the ratio that increases the hunting period that is used for the ROPC operation is preferred.
Fig. 7 illustrates the example of the ratio in ROPC operating area and APC zone; I.e. three kinds of situations.The fixed ratio to 60% of ratio " a " expression ROPC operating area (that is three hunting periods in five hunting periods) and with the irrelevant situation of radius.Ratio " b " expression, until a certain radial location r2, the ratio of ROPC operating area is 40% situation.Than the long radius position, ratio is increased to 60%.The situation that ratio " c " expression is such: until a certain radial location r1, the ratio of ROPC operating area is 0%, promptly only carries out APC and does not relate to ROPC; The ratio of ROPC operating area increases along with radial location in the scope of r2 at r1 subsequently; And in radial location r2 or bigger position, the ratio value of ROPC operation is 100%; Promptly only carry out ROPC.The situation that ratio " c " expression is such: by utilizing the APC zone to carry out APC and ROPC, rather than always carry out APC and ROPC at the All Ranges of CD 10 at least some zones.
In the present embodiment, ROPC the term of execution, by utilizing B/P or B/P
2Increase or reduce recording power.Yet, B/P
n(" n " is the real number more than 1 or 1) also can more generally use, so that increase or reduce recording power thus.
Figure 15 illustrates the data structure of blu-ray dish once more.The protection zone is provided with predetermined repetition bits mode region (predetermined iterative bit pattern area) and APC zone.The protection zone is corresponding to distributing to this repetition bits mode region (8 * 69 channel bit) three hunting periods in these cycles eight hunting periods.Distribute to the APC zone remaining five hunting period.Although five hunting periods guarantee to be used for the APC zone, actual learn or proofread and correct the i-L characteristic do not need described five hunting periods.All the other cycles of distributing in cycle in APC zone still keep not using.And, also providing the APC zone in the zone because move at the top of RUB, the APC zone in the protection zone is with regard to unnecessary use.In this case, all still remain and do not use the zone all five hunting periods.
As mentioned above, in the present embodiment, the APC zone after the repetition bits mode region in the protection zone that intercourse write down of data record is noted.By review methods its evaluate parameter quoted and the relation between the recording power are obtained by utilizing the APC zone.Particularly, after the interruption of data recording, assessment is and then in the quality of recorded data before, and the relation between recording power and the evaluate parameter is calculated by utilizing the APC zone.By utilizing and then in that the quality of recorded data and the relation of being calculated increase or reduce current record power before.Pass between recording power and the evaluate parameter ties up to zone that the record of data interrupted rather than calculates at the test zone of carrying out OPC.Thereby recording power can accurately be regulated.
Fig. 9 illustrates the configuration of major part, and this part is regulated the recording power in the APC zone in the protection zone that is included in recording unit block RUB.Except having LD, quadruple photo-detector PD, object lens, beyond the object lens driving circuit (driving circuit is used for producing drive actions in focus direction and at tracking direction) etc., optical pickup apparatus 16 also has driver (LDD) 22.
Be provided to playback system circuit (binarization circuit) 34 that comprise the PLL circuit and the demoder 36b of encoder/decoder circuitry 36 from the difference signal (difference signal between interior rail signal and the outer rail signal) of quadruple photo-detector as reproducing signal and swinging signal.From quadruple photo-detector and signal (form and signal) by interior rail signal and outer rail signal be fed into low-pass filter and balanced device 141.High frequency noise from signal remove, and the predetermined frequency component of this signal is raised and flattens.Subsequently and signal be fed into peak holding circuit 143, averaging circuit 144 and bottom holding circuit 146.
The peak level of peak holding circuit 143 detections and signal, and the peak level that will detect like this outputs to sampling hold circuit (S/H) 148.The mean value of averaging circuit 144 detections and signal, and the value that will detect like this outputs to sampling hold circuit 150.Bottom holding circuit 146 detects and the bottom level of signal, and the bottom level that is detected is outputed to sampling hold circuit 152.
Sampling hold circuit 148 detection peak level; Sampling hold circuit 150 detects the mean value level; Sampling hold circuit 152 detects the bottom level.The level of sampling maintenance supplies to system controller 32 like this.Sampling hold circuit 148,150 and 152 sampling time sequence are determined according to the clock signal that the PLL circuit of playback system circuit 34 is obtained.
According to the OPC clock signal of device or timing sequencer from form; the scrambler 36a of encoder/decoder circuitry 36 receives clock signal Topc, and it is illustrated in the APC zone after the repetition bits mode region of protection zone (Guard 3) to be recorded after the interruption of data recording.In order to calculate the relation between recording power and the evaluate parameter, the recording pulse signal that recording power progressively changes is generated and is fed into driver 22.According to this recording pulse signal, driver 22 tentatively writes test data in the APC zone of protection zone.The reproducing signal of the test data that so tentatively writes supplies to playback system circuit 34 and demoder 36b, and signal is here by demodulation; The signal of demodulation supplies to system controller 32.System controller 32 assessments are through demodulated data, thus the relation between calculating recording power and the evaluate parameter.For example assess the β value of the test data that tentatively writes with the respective record power level, so that calculate the relation between recording power and the β value thus.By using and then in the β value of recorded data and the relation between recording power and the β value before, recording power is calculated, the target beta value of being obtained at first by this recording power, thereby increase or reduce recording power.Particularly, system controller 32 is regulated recording power according to the following process that provides.
(1), in the test zone (PCA) of CD 10, carries out OPC, and optimum recording power Po is set prior to data recording.
(2) with optimum recording power Po record data.
(3) when data recording reaches booking situation length, when data have only write down a predetermined amount of time, when detecting the predetermined increase level of temperature, or when the underrun (under-run) of impact damper taking place, interrupt data recording.
(4) record repetition bits pattern in the protection zone, and in the APC zone of protection zone, progressively change recording power, thus tentatively write test data.
(5) after finishing tentative the writing of data, reproduce the arbitrary portion of the data of and then before the interruption of recording operation, being obtained, and the quality (for example, β value) of the such data division that reproduces of assessment.
(6) reproduce the test data that tentatively writes, and assess the quality of the data of being reproduced, thereby calculate the relation between recording power and the evaluate parameter.
(7), regulate current record power according to the relation that exists between result calculated performed in (6) or (5) and (6).
Figure 10 illustrates the recording pulse signal pattern of the light that LD launched (or by), and it is used to tentatively write test data in the APC zone of protection zone (Guard 3) to be recorded after recording operation interrupts.In Figure 10, recording power divided for five steps changed: power (0.7Po), and it reduces 30% with respect to current record power P o; Power (0.85Po), it reduces 15% with respect to current record power P o; Power (1.15Po), it increases by 15% with respect to current record power P o; And power (1.3Po), it increases by 30% with respect to current record power P o.Power level is distributed to a hunting period in five hunting periods, and test data is tentatively write.In first hunting period, recording power is 0.7Po.In second hunting period, recording power is 0.85Po, or the like.Test data can be at random or have a predetermined length.In the accompanying drawings, data with shortest length and the repeat pattern with data of maximum length are arranged.
Figure 11 A illustrates the waveform of the reproducing signal that has been obtained when test data shown in Figure 10 has tentatively write to 11D.Figure 11 A illustrates test data and waveform signal; Figure 11 B illustrates owing to peak holding circuit 43 has detected the waveform that the peak value with the waveform of signal obtains; Figure 11 C illustrates owing to averaging circuit 44 has detected the waveform that the mean value with the waveform of signal obtains; And Figure 11 D illustrates owing to bottom holding circuit 46 has detected the waveform that the bottom with the waveform of signal obtains.The β value defined of reproducing signal is β=(A-B)/(A+B), supposes that the peak level note of the reproducing signal of RC coupling is made A, and the bottom level note of the reproducing signal of RC coupling is made B.By utilizing these values, system controller 32 calculates the β value for each recording power, and the β value that will calculate like this stores storer into.Demoder 36b sends to system controller 32 with sequential (the reproduction sequential of test data), and system controller 32 calculates the β value according to clock signal for each recording power.
Figure 12 illustrates a curve map, has wherein drawn the β value of being calculated at the corresponding power level (note is made P1 to P5) of dividing for five steps changed (note is made β 1 to β 5).(P, β) these organize calculated relationship expression formula β=f (P) to system controller 32 by utilizing.With this relational expression of target beta value β m substitution, thereby calculate target record power P m and increase or reduce current record power.
Simultaneously, the detection of β 1 to β 5 shown in Figure 12 is carried out in a short time period.Therefore, depend on time constant, deviation can occur such as the testing circuit of peak holding circuit 43 grades.So, as shown in figure 13, to suppose in relational expression β=f (P), deviation to have occurred, system controller 32 is provided with β=f (P)+α (α is a constant); And will (P, the expression formula that group substitution β) is provided with like this be so that calculate α thus by and then the reproduction of recorded data is obtained before recording operation.By the result of this relational expression of substitution, calculate target record power P m as target beta value β m, so that increase or reduce current record power thus.Certainly, the β value is the example evaluate parameter.Usually when the evaluate parameter note was made Q, basic demand was: Q=f (P)+α is defined as the relation between recording power and the evaluate parameter, and determines deviation α according to the evaluate parameter Qo and the power P o of the data of and then being obtained before data recording is interrupted.
As mentioned above, in the present embodiment, recording power of being realized in the zone of interrupting takes place and the pass between the evaluate parameter (β value etc.) tie up to when data recording is interrupted and calculate.Recording power is regulated according to described relation, therefore, has improved the degree of regulation of recording power.In addition, the protection zone that is before guaranteed when the interruption of data recording is used as such zone: it will be used to calculate the relation between recording power and the evaluate parameter.Therefore the recording capacity of CD 10 can not reduce yet.
Although embodiments of the invention have been made foregoing description, the present invention is not limited to described embodiment, and is easy to change into other form.
For example in the present embodiment, as shown in Fig. 9 and 11, such as the analogue detection circuitry detection and the signal of peak holding circuit 143 grades, and will detect like this supply to system controller 32 with signal, yet as shown in figure 14, A/D converter 154 also can will become digital signal with conversion of signals; Digital signal is supplied to system controller 32; And by system controller 32 detection peak and bottom value, thereby calculate the β value.
And in the present embodiment, the APC zone in the protection zone tentatively writes test data whole five hunting periods by utilizing.Yet any period in five hunting periods in the APC zone also can be as the zone for the treatment of tentatively to write test data.The size in this zone also can be fixed or changed.When the variable size in described zone, preferably so be provided with, so that make the size in described zone become big in proper order according to the needs of regulating recording power.For example at the interior rail of CD 10, by only utilize three hunting period power only change power with three steps.At the outer rail of CD 10, change power with five steps by utilizing whole hunting period power.Like this, regulate the size in described zone changeably according to the radial location on the CD 10.Alternatively, also can regulate the size in the zone for the treatment of tentatively to write test data changeably according to the type of CD 10.When only being used for tentatively writing test data three hunting periods, can be used for the APC of the initial purpose of conduct two remaining hunting periods.
Claims (20)
1. a CD drive is used for coming record data at each booking situation piece, wherein:
Described record block comprises user data area;
Described CD drive comprises:
The irradiation unit that is used for radiation recording laser bundle; And
Controller, the described recording laser bundle of its presumptive area radiation in the non-described user data area of described record block, so that tentatively write test data thus with predetermined length, and it regulates the power of described recording laser bundle according to the catoptrical amount that is realized during tentative writing; And,
The power of described recording laser bundle during data recording at each booking situation piece re-adjustments.
2. according to the CD drive of claim 1, wherein the presumptive area of non-described user data area is the APC zone that is used to regulate power.
3. according to the CD drive of claim 2, wherein said controller tentatively writes the data with predetermined length by the remainder that utilizes the zone that is used to the relation between electric current and the light emission measure of calculating in the described APC zone.
4. according to the CD drive of claim 1, wherein said predetermined length is longer than the specified length of data to be recorded.
5. according to the CD drive of claim 1, the Write strategy that wherein is used for described test data is identical with the Write strategy that is used for data to be recorded.
6. according to the CD drive of claim 1, wherein when described test data is tentation data, described controller is regulated the power of described recording laser bundle according to the value of horizontal B, described horizontal B be when catoptrical amount owing to the formation in the hole amount of the light that reflected when stablizing that becomes.
7. according to the CD drive of claim 6, wherein said controller calculates B/P according to the power P of the recording laser bundle that is obtained and the value B of described horizontal B when tentatively writing described test data
n(" n " is the real number more than 1 or 1), and according to B/P
nRegulate the power of described recording laser bundle.
8. according to the CD drive of claim 6, wherein, described controller tentatively writes described test data so that change the power of described recording laser bundle thus, and regulates the power of described recording laser bundle according to the value of the horizontal B of the power that is relevant to described recording laser bundle.
9. according to the CD drive of claim 3, all the other the regional ratios in the wherein said APC zone are regulated changeably at each CD.
10. according to the CD drive of claim 3, all the other the regional ratios in the wherein said APC zone are regulated changeably according to the radial location on the CD.
11. a CD drive is used for coming record data at each booking situation piece, wherein:
Described record block comprises user data area;
Described CD drive comprises:
The irradiation unit that is used for radiation recording laser bundle; And
Controller, it regulates recording power by interrupt data recording during record data; And,
Power in the presumptive area of the non-described user data area of described controller by changing described record block when data recording is interrupted tentatively writes test data, and according to regulating the power of described laser beam by reproducing quality of signals and the relation between the power that the test data that tentatively writes obtains.
12. CD drive according to claim 11, wherein said controller assessment is the quality of recorded data before interrupting and then, and according to the quality of recorded data before interrupting and then, and according to regulating the power of described laser beam owing to reproduce quality of signals and the relation between the power that the test data that tentatively writes obtains.
13. according to the CD drive of claim 11, wherein the presumptive area of non-described user data area is to move out of protection zone afterwards, zone.
14. according to the CD drive of claim 13, wherein the presumptive area of non-described user data area is the APC zone, it is arranged in the described protection zone, is used to regulate power.
15. according to the CD drive of claim 11, wherein said controller has recorded predetermined length or has only write down the time point interruption data recording of recording period in data.
16. according to the CD drive of claim 11, wherein said controller interrupts data recording at the time point that detects the predetermined temperature variable quantity.
17. according to the CD drive of claim 11, wherein said controller interrupts data recording at the time point that detects buffer underrun.
18. CD drive according to claim 12, wherein said controller will be by reproducing the test data tentatively write relation between the power P of the quality of signals Q that obtains and this signal be calculated as Q=f (p)+α, α is a target offset, and calculates described deviation α by signal quality Qo and the power P o that utilizes the data that and then realized before data recording is interrupted.
19., treat tentatively to write the size in the zone of described test data in the wherein said APC zone and regulate changeably according to optical disc types according to the CD drive of claim 11.
20., treat tentatively to write the size in the zone of described test data in the wherein said APC zone and regulate changeably according to the radial location on the CD according to the CD drive of claim 11.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006063002A JP4501876B2 (en) | 2006-03-08 | 2006-03-08 | Optical disk device |
| JP2006-062998 | 2006-03-08 | ||
| JP2006062998A JP4470896B2 (en) | 2006-03-08 | 2006-03-08 | Optical disk device |
| JP2006-063002 | 2006-03-08 | ||
| JP2006063002 | 2006-03-08 | ||
| JP2006062998 | 2006-03-08 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101034564A true CN101034564A (en) | 2007-09-12 |
| CN101034564B CN101034564B (en) | 2010-10-13 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710079996XA Expired - Fee Related CN101034564B (en) | 2006-03-08 | 2007-03-06 | Optical disk drive |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4470896B2 (en) |
| CN (1) | CN101034564B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20090110987A (en) * | 2008-04-21 | 2009-10-26 | 삼성전자주식회사 | Optical disc driver and control method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6950378B1 (en) * | 1999-07-28 | 2005-09-27 | Matsushita Electric Industrial Co., Ltd. | Laser power control method and optical disk device |
| JP2002358640A (en) * | 2001-05-28 | 2002-12-13 | Sony Corp | Optical recorder and laser power control method |
-
2006
- 2006-03-08 JP JP2006062998A patent/JP4470896B2/en not_active Expired - Fee Related
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2007
- 2007-03-06 CN CN200710079996XA patent/CN101034564B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN101034564B (en) | 2010-10-13 |
| JP4470896B2 (en) | 2010-06-02 |
| JP2007242138A (en) | 2007-09-20 |
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