CN101770786B - Recording power compensating system and method - Google Patents
Recording power compensating system and method Download PDFInfo
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- CN101770786B CN101770786B CN2008101903698A CN200810190369A CN101770786B CN 101770786 B CN101770786 B CN 101770786B CN 2008101903698 A CN2008101903698 A CN 2008101903698A CN 200810190369 A CN200810190369 A CN 200810190369A CN 101770786 B CN101770786 B CN 101770786B
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Abstract
The invention relates to a recording power compensating system and a recording power compensating method. A best power test is controlled by a control unit; a calculating unit is used for approximating test power and a corresponding asymmetry parameter into a linear test power function and calculating a difference value of the asymmetry parameter tested by a test unit and corresponding power compensation amount; and a power compensating unit makes use of the power compensation amount to adjust laser beam power so as to improve the recording quality.
Description
Technical field
The present invention relates to a kind of recording power compensating system and method, relate in particular to CD player and carry out in the burning, utilize compensation power to keep the system and method for burning quality with the power of best power test.
Background technology
The laser beam that the CD of writable type generally sends through read head is radiated on the CD and forms pothole or mark such as distortion mutually, utilizes markedness and does not have the difference of reflection light quantity between mark, and the digital signal of formation 0 and 1 reaches the purpose of record data.The size of laser beam power; Need make on the CD reflection light quantity of mark keep certain level, the too big or deficiency of power all can influence mark depth shape, changes the light volume reflection of mark; The reflection light quantity difference that causes markedness and do not have between mark is difficult to identification, so that can't read and burning failure.
As shown in Figure 1, be the data of optical disk structure of prior art.CD 10 to the outer ring, is divided into test section (Power Calibration Area) 11, Lead-In Area (Lead-in Area) 12, user data field (User Data Area) 13 and leading-out zone (Lead-out Area) 14 etc. by inner ring in regular turn.The zone of actual testing laser light beam power when wherein, test section 11 provides burning.Because the CD of various labels is because of differences such as processing procedure, technology, coating and material compositions; Induction sensitivity to laser beam is different, and the disc manufacturing plant merchant is at the laser beam power P i of Lead-In Area 12 record appointments and asymmetry parameter (Asymmetry) the β i of expression mark burning quality.User data field 13 is the zone of actual burn data, and the mark that leading-out zone 14 provides CD to stop.
Because all there are other property difference in each CD player and CD, general CD player reads the laser beam power P i and the asymmetry parameter β i of Lead-In Area 12 manufacturers appointment earlier before burning.With preset difference,, form the measured power of 15 equal difference to the power P i of appointment upwards and downward 7 differences of plus-minus respectively.Then in the test section 11, with 15 measured power actual burn data, read each measured power burning mark then, and detect its asymmetry parameter β.Select the power of specifying asymmetry parameter β i, as the recording power of this CD, to accomplish best power test control (OptimumPower Control is called for short OPC) near manufacturer.
Yet; Best power test control is by in stage 15 measured powers of equal difference; Select the measured power of specifying asymmetry parameter β i, from the asymmetry parameter β i of best burning quality one section gap is arranged still, and it is best in quality to guarantee that the burning mark obtains near manufacturer.In addition, best power test control is to accomplish at inner ring.When carrying out burning,, the asymmetry parameter β that causes the burning mark can't be kept necessarily, and influence burning mark quality because of CD Internal and external cycle translational speed is different, interval fast conversion or the burning variation of temperature etc. read of multiple.
In order to adjust laser beam power; Keep certain asymmetry parameter β, I276083 number " method of burning CD and related system " patented claim announced in Taiwan, tests to CD, CD player, rotating speed and the replication rate etc. of different label kinds in advance; Form the database of the corresponding power back-off amount of different asymmetry parameter β measuress of dispersion with it; Be stored in the CD player, so that asymmetry parameter β is when changing, corresponding power back-off amount is carried out laser beam power back-off to breaking forth.But database need be tested existing all CD players and CD, builds the work of putting too in complicated.And the CD player of new label and new kind or CD constantly occur always, and old machine and CD can't be suitable for immediately.In addition; Even the CD player of identical label, kind or CD; Because of the error of processing procedure, assembling, material or uniformity coefficient, also can cause the characteristic variation of CD player out of the ordinary or CD, can't be suitable for the data of prior storage; The quality of burning mark can not be kept necessarily, even can't read and cause burning failure.Therefore, the known optical disc machine still has problem to need to be resolved hurrily on the system and method for recording power compensation.
Summary of the invention
The object of the invention is providing a kind of recording power compensating system; Asymmetry parameter β by detecting unit monitoring burning mark; The linear measured power function that utilizes computing unit to be approximated to; Obtain the power back-off amount, power controlling compensating unit adjustment recording power, with the asymmetry parameter β control of burning mark within the acceptable range.
Another object of the present invention is providing a kind of recording power compensation method, and the data through with the best power test are approximated to linear measured power function, utilize the asymmetry parameter of appointment, obtain accurate recording power, to promote burning quality.
A purpose more of the present invention is providing a kind of recording power compensation method, utilizes and is approximated to linear measured power function, in response to the variation of asymmetry parameter in the burning, calculates the recording power compensation rate fast, to keep burning quality.
In order to reach the purpose of aforementioned invention, recording power compensating system of the present invention rotates the CD of recordable by control module control Spindle Motor, and control read head projecting laser light beam is to CD, reads or the mark of burning CD.With reading or the temporary storage unit of the data of burning mark.Computing unit is approximated to linear measured power function with the measured power and the corresponding asymmetry parameter of best power test control, and calculates the asymmetry parameter difference and the corresponding power back-off amount of detection.Utilize power compensating unit adjustment laser beam power, with the quality of control burning mark in tolerance interval.
Recording power compensation method of the present invention is at first read and is specified laser beam power, carries out the best power test; The test value of this best power test is approximated to linear measured power function; Read the appointment asymmetry parameter, this measured power function calculation of substitution goes out best recording power, as existing recording power; Carry out burning data; The inspection burning quality detects the asymmetry parameter of burning mark; Calculate the asymmetry parameter of this detection and the difference of target asymmetry parameter; Utilize the corresponding power back-off amount of measured power function calculation asymmetry parameter difference; With the existing laser beam power of power back-off amount compensation.
Measured power function of the present invention does
y＝a*x+b
A wherein, b is a coefficient
Y is a laser optical power power
X is an asymmetry parameter.
Utilize existing recording power Pn, detect asymmetry parameter β n and target asymmetry parameter β t substitution, ask for target recording power Pt=a* (β t-β n)+Pn, to obtain power back-off amount=Pt-Pn.And after the difference of calculating asymmetry parameter capable of using and target asymmetry parameter, check that further non-difference is greater than predetermined value? If difference is not more than predetermined value, keep existing power, if difference greater than predetermined value, is carried out the power back-off amount again.
Description of drawings
Fig. 1 is the data of optical disk structural drawing of prior art.
Fig. 2 is the functional block diagram of recording power compensating system of the present invention.
Fig. 3 is the process flow diagram of best power test control of the present invention.
Fig. 4 is the distribution plan of best power test control test value of the present invention.
Fig. 5 is the process flow diagram of recording power compensation method of the present invention.
[main element symbol description]
20 recording power compensating systems
21 control modules
22 Spindle Motors
23 read heads
24 storage unit
25 detecting units
26 computing units
27 power compensating unit
30 CDs
31 test sections
32 Lead-In Areas
33 user data fields
34 leading-out zones
Embodiment
Relevant the present invention is for reaching above-mentioned purpose, and technological means that is adopted and effect thereof lift preferred embodiment now, and conjunction with figs. are explained as follows.
Please refer to Fig. 2, be the functional block diagram of recording power compensating system of the present invention.Fig. 2 shows that recording power compensating system 20 of the present invention comprises control module 21, Spindle Motor 22, read head 23, storage unit 24, detecting unit 25, computing unit 26 and power compensating unit 27 etc.Wherein control module 21 is a microprocessor, rotates a CD 30 in order to control Spindle Motor 22.CD 30 is a cd-recordable, comprises test section 31, Lead-In Area 32, user data field 33 and leading-out zone 34 by inner ring to outer ring.Control module 21 is controlled read head 23 projecting laser light beam to CDs 30 in addition, and along the moving radially of CD 30, and reads or the mark of burning CD 30.Storage unit 24 reads or the mark data of burning in order to temporary.
In addition, detecting unit 25 controlled unit 21 are controlled, and read the asymmetry parameter β of mark in order to detection.And control module 21 control computation unit 26 to 15 measured powers and the corresponding asymmetry parameter β of best power test control, with the mode of linear-apporximation (Linear Fitting), are calculated to be linear measured power function.Computing unit 26 also can detect the asymmetry parameter β of burning mark according to detecting unit 25; Calculate asymmetry parameter β and the difference of goal-selling asymmetry parameter β t and corresponding power back-off amount thereof; Via power compensating unit 27; The laser beam power of compensation read head 23 projection, with the quality control of burning mark within the acceptable range.
Please be simultaneously with reference to figure 2, Fig. 3 and Fig. 4, the flow process that Fig. 3 carries out best power test control for the present invention, Fig. 4 is best power test control test value distribution plan of the present invention.When recording power compensating system 20 of the present invention begins burnings, as shown in Figure 3, at first at step R1,, read the laser optical power Pi and the asymmetry parameter β i of manufacturer's appointment by control module 21 control read head 23 to Lead-In Areas 32.Utilize the laser optical power Pi of manufacturer's appointment, begin to carry out best power test control in the test section 31 of inner ring, and read and write down test value to storage unit 24.The test value of 15 laser optical power and corresponding asymmetry parameter β thereof, the asymmetry parameter β as shown in Figure 4 that distributes-power coordinate figure.Get into step R2, taken out the test value of storage unit 24 records again by control module 21, transfer to computing unit 26, control computation unit 26 is calculated to be linear measured power function with the mode of linear-apporximation (Linear Fitting)
y＝a*x+b
A wherein, b is a coefficient
Y is a power
X is asymmetry parameter β
And can obtain this CD player and the suitable fc-specific test FC power function of CD.
Then, measured power function y is stored in storage unit 24 by control module 21 at step R3.Get into step R4 again, read the asymmetry parameter β i of appointment.Get into step R5, mat control module 21 control computation unit 26, with the measured power function y=a*x+b of storage unit 24 storages, the asymmetry parameter β i of substitution appointment calculates best recording power Pm.Get into step R6 then, through power compensating unit 27, the power of adjustment read head 23 emission laser light is accomplished best power test control to best recording power Pm with best recording power Pm.
Recording power compensation method of the present invention can be approximated to linear measured power function through the data with the best power test.Utilize the asymmetry parameter of appointment, obtain more accurate best recording power Pm.Asymmetry parameter β by best recording power Pm actual burn mark is produced can than the asymmetry parameter β i near appointment, and reach the purpose that promotes burning quality than selecting power by 15 stage measured powers of equal difference.
Please be simultaneously with reference to figure 2, Fig. 4 and Fig. 5, Fig. 5 is the flow process of recording power compensation method of the present invention.As shown in Figure 5, begin burning data in step S1 the present invention.Accomplish aforesaid best power test control flow of the present invention earlier at step S2, obtain approximately linear measured power function and be adjusted to best power.Get into step S3 again and carry out the actual burn data to user data field 33.Get into step S4; In the burning process; Maybe be because of 24 of storage unit deposited the burning data deficiency, CD changes rotating speed or burning times speed or temperature variation etc. are suspended burning; When carrying out the burning quality inspection, when read head 23 reads the burning mark, detect the asymmetry parameter β of burning mark by control module 21 control detection unit 25.Is the difference DELTA β of inspection asymmetry parameter β and goal-selling asymmetry parameter β t greater than predetermined value at step S5? If difference DELTA β is not more than predetermined value; The quality of expression burning mark is in tolerance interval; Directly getting into step S8, is whether the burning of inspection burning data accomplished? If burning is not accomplished, be back to step S3 and continue burning data; If burning is accomplished and is then got into step S9, finishes burn job.If difference DELTA β is greater than predetermined value; The quality of expression burning mark reduces; Get into the measured power function y=a*x+b of step S6 substitution β parameter to storage unit 24 storages,, calculate target recording power and power back-off amount fast by control module 21 control computation unit 26.Then get into step S7, through-put power compensation rate to power compensating unit 27 with the existing laser beam power of in good time adjustment, is accomplished stage power compensation operation.Getting into step S8 then, is whether the burning of inspection burning data accomplished? If burning is accomplished, be back to step S3 and continue burning data, if the burning completion then gets into step S9, finish burn job.
In step S6, the process of computing unit 26 rated output compensation rates, as shown in Figure 4 for example, when carrying out burning, read the burning mark and detect corresponding asymmetry parameter β n with existing recording power Pn.If β n parameter exceeds preset target asymmetry parameter β t one preset range, burning quality reduces, therefore needs adjustment asymmetry parameter β n to preset β t parameter.Wherein target asymmetry parameter β t can be identical with appointment asymmetry parameter β i.The corresponding unknown power of hypothetical target asymmetry parameter β t is target recording power Pt, and (β n, Pn) (β t Pt) among the substitution measured power function y=a*x+b, obtains with the adjustment target with existing
Pt＝a*(βt-βn)+Pn
Therefore; By existing recording power Pn, asymmetry parameter β n and preset target asymmetry parameter β t; Proportionate relationship between asymmetry parameter variable quantity that can provide through the measured power function and power back-off amount by asymmetry parameter difference DELTA β=(β t-β n), calculates target recording power Pt and corresponding power back-off amount Δ P=(Pt-Pn) thereof fast; Compensate existing laser beam power, with adjustment asymmetry parameter β.
Therefore, recording power compensating system of the present invention and method can be through the asymmetry parameter β of detecting unit monitoring burning mark; The linear measured power function that utilizes computing unit to be approximated to; In response to the variation of asymmetry parameter in the burning, quick rated output compensation rate, power controlling compensating unit adjustment recording power; The asymmetry parameter β of burning mark is controlled within the acceptable range, to keep burning quality.
The above person; Only in order to convenient explanation the preferred embodiments of the present invention, scope of the present invention is not limited to these preferred embodiments, and is all according to any change that the present invention did; Do not breaking away under the spirit of the present invention, all belonging to the scope of claims requirement protection of the present invention.
Claims (11)
1. recording power compensating system comprises:
One control module, the control Spindle Motor rotates the CD of recordable, and other controls read head projecting laser light beam to CD, reads or the mark of burning CD;
One storage unit, by control module control, temporary this reads or the data of burning mark;
One detecting unit is by the asymmetry parameter of control module control detection mark;
One computing unit; By measured power and the corresponding asymmetry parameter thereof of control module control with best power test control; Be approximated to linear measured power function; And, calculate the asymmetry parameter of detection and the difference and the corresponding power back-off amount of difference of goal-selling asymmetry parameter with linear measured power function; And
One power compensating unit, the power back-off amount of reception computing unit, the laser beam power of adjustment read head,
Should linearity measured power function be y=a*x+b wherein, a wherein, b is a coefficient, and y is a laser optical power power, and x is an asymmetry parameter,
Wherein, ask for target recording power Pt=a* (β t-β n)+Pn, to obtain power back-off amount=Pt-Pn by existing recording power Pn, detection asymmetry parameter β n and target asymmetry parameter β t.
2. recording power compensating system as claimed in claim 1, wherein this CD comprises Lead-In Area record appointment asymmetry parameter, and preset target asymmetry parameter equals to specify asymmetry parameter.
3. recording power compensating system as claimed in claim 2, wherein this computing unit calculates the best recording power of best power test control to specify the linear measured power function of asymmetry parameter substitution.
4. recording power compensating system as claimed in claim 1, wherein this measured power function of this cell stores.
5. recording power compensating system as claimed in claim 1, wherein this computing unit is checked the asymmetry parameter of detection and the difference of target asymmetry parameter, the quality of control burning mark is in tolerance interval.
6. recording power compensation method, its step comprises:
(1) reads appointment laser beam power, carry out the best power test;
(2) test value with this best power test is approximated to linear measured power function;
(3) read the appointment asymmetry parameter, this measured power function calculation of substitution goes out best recording power, as existing recording power;
(4) carry out burning data;
(5) the inspection burning quality detects the asymmetry parameter of burning mark;
(6) calculate the asymmetry parameter of this detection and the difference of target asymmetry parameter;
(7) utilize the corresponding power back-off amount of measured power function calculation asymmetry parameter difference;
(8) with the existing laser beam power of power back-off amount compensation; And
(9) accomplish the power back-off operation,
Wherein this measured power function is y=a*x+b, a wherein, and b is a coefficient, and y is a laser optical power power, and x is an asymmetry parameter,
Wherein this step (7) is asked for target recording power Pt=a* (β t-β n)+Pn by existing recording power Pn, detection asymmetry parameter β n and target asymmetry parameter β t, to obtain power back-off amount=Pt-Pn.
7. recording power compensation method as claimed in claim 6, wherein the test value of this best power test is 15 laser optical power and corresponding asymmetry parameter thereof.
8. recording power compensation method as claimed in claim 6, wherein this target asymmetry parameter is a preset value.
9. recording power compensation method as claimed in claim 6 wherein equals to specify asymmetry parameter for the target asymmetry parameter.
10. recording power compensation method as claimed in claim 6 wherein further comprises step after this step (6) calculated difference:
Is (6-1) difference of inspection asymmetry parameter greater than predetermined value? If difference is not more than predetermined value, get into step (9), if difference, then gets into step (7) greater than predetermined value.
11. recording power compensation method as claimed in claim 6; After wherein this step (9) is accomplished the power back-off operation; Is further comprise step: (9-1) whether the inspection burning data accomplished? If burning is not accomplished; Be back to step (4) and continue burning data, if then entering end burn job is accomplished in burning.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101903698A CN101770786B (en) | 2008-12-31 | 2008-12-31 | Recording power compensating system and method |
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|---|---|---|---|
| CN2008101903698A CN101770786B (en) | 2008-12-31 | 2008-12-31 | Recording power compensating system and method |
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| Publication Number | Publication Date |
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| CN101770786A CN101770786A (en) | 2010-07-07 |
| CN101770786B true CN101770786B (en) | 2012-01-11 |
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| CN2008101903698A Expired - Fee Related CN101770786B (en) | 2008-12-31 | 2008-12-31 | Recording power compensating system and method |
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| CN111722205A (en) * | 2019-03-22 | 2020-09-29 | 深圳市速腾聚创科技有限公司 | Calibration method, system, device, equipment and storage medium for laser ranging |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1691150A (en) * | 2004-04-23 | 2005-11-02 | 皇家飞利浦电子股份有限公司 | Method and apparatus for determining erasing power of rewritable optical disk |
| CN1841532A (en) * | 2005-01-11 | 2006-10-04 | 威盛电子股份有限公司 | Optical disc recording power adjusting method |
| JP2008181575A (en) * | 2007-01-23 | 2008-08-07 | Funai Electric Co Ltd | Disk device |
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- 2008-12-31 CN CN2008101903698A patent/CN101770786B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1691150A (en) * | 2004-04-23 | 2005-11-02 | 皇家飞利浦电子股份有限公司 | Method and apparatus for determining erasing power of rewritable optical disk |
| CN1841532A (en) * | 2005-01-11 | 2006-10-04 | 威盛电子股份有限公司 | Optical disc recording power adjusting method |
| JP2008181575A (en) * | 2007-01-23 | 2008-08-07 | Funai Electric Co Ltd | Disk device |
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| CN101770786A (en) | 2010-07-07 |
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Granted publication date: 20120111 Termination date: 20121231 |