CN101763866B - Automatic power control system for optical disc drive and method thereof - Google Patents
Automatic power control system for optical disc drive and method thereof Download PDFInfo
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- CN101763866B CN101763866B CN2009102230933A CN200910223093A CN101763866B CN 101763866 B CN101763866 B CN 101763866B CN 2009102230933 A CN2009102230933 A CN 2009102230933A CN 200910223093 A CN200910223093 A CN 200910223093A CN 101763866 B CN101763866 B CN 101763866B
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Abstract
The invention relates to an automatic power control system of an optical disk drive and a method for automatic power control. An initial driving signal is used for driving an optical pick-up head of the optical disk drive. The optical disk drive is utilized for reading or writing data on an optical disk, the optical disk comprises a plurality of auto power control areas (APC areas) and a plurality of data areas, and the APC areas and the data areas are interleaved in between. The method comprises: in the APC areas, using an initial driving signal to drive the optical pick-up head to emit laserbeam; obtaining a detected level of the laserbeam; (a) comparing the detected level with a target level to generate one power level offset; (b) adjusting the initial driving signal according to the power level offset to obtain an intermediated initial driving signal; (c) obtaining an intermediated initial driving signal level; (d) repeating steps (a), (b) and (c) to determine a correct initial driving signal.
Description
Technical field
The invention relates to CD-ROM device, particularly relevant for the automatic power control system of CD-ROM device and the method for automated power control.
Background technology
CD-ROM device is to utilize data Layer that a read head throws laser to one laser disc data are write this data Layer or this data Layer reading of data certainly.When read head sends high-power laser, laser melts the data Layer of laser disc or changes the phase place of data Layer, and with the data pattern portrayal thereon, action is finished data burning on laser disc by this.When read head sends lower powered laser, low power laser can't melt the data Layer of laser disc or change the phase place of data Layer.This moment, read head was according to the pattern decoded data pattern from the video disc laser light reflected, so that from the laser disc reading of data.Therefore the read head of laser disc must produce the laser with different capacity value under different application functions.
Read head produces laser with a laser diode.The laser power that laser diode produces is controlled by a drive current.When read head continue to produce laser, can produce heat and the temperature of read head is risen.Along with the temperature rising of read head, drive current also must raise, so that the control laser diode sends the laser of tool constant power value.Fig. 1 shows the relation between laser power and drive current.When the temperature of read head is T
1The time, the pass between laser power and drive current is L
0When the temperature of read head is T
2The time, the pass between laser power and drive current is L
1Or L
2Relation line L
0With L
1Has different current offset values Ith (T
1) and Ith (T
2), and relation line L
1With L
2Has different slopes.
When the read head temperature rises, reduce for fear of the power of laser, CD-ROM device must comprise an automated power controlling mechanism so that adjust the drive current size of laser diode according to temperature, is constant so that keep laser power.The synoptic diagram of the signal that Fig. 2 is produced for existing automated power controlling mechanism.Existing automated power controlling mechanism is a closed loop control system.When read head write data to CD-ROM device with a laser power, read head produced a drive current and produces a laser to handle laser diode, and the power of front end detecting diode detecting reflector laser is to produce front end detecting diode output signal.Front end detecting diode output signal is followed sampled reference as the drive current that calculates laser diode.In Fig. 2, the laser that laser diode produces comprises a plurality of power, for example cooling power, deletion power, Writing power, and drive excessively that (Over Drive, OD) power is so that write laser disc with data.For instance, the deletion power of front end detecting diode output signal and the sampled reference of Writing power as the drive current that calculates laser diode.
When CD-ROM device was the Blu-ray Disc machine, packing density was higher.Therefore in order to write faster that data to the performance number of the laser of Blu-ray Disc continues that short time and replication rate become.Fig. 3 is the synoptic diagram of the signal that produces of the automated power controlling mechanism of Blu-ray Disc correspondence.Blu-ray Disc comprises at least two kinds of different zones such as data field and automated power control zone.The automated power control zone is controlled in order to carry out automated power, and the data field writes for general data.When read head writes Blu-ray Disc with data (for example None-return-to-zero (NRZ) signal) with high replication rate, the power of laser is all kept one very short period.Because front end detecting diode needs a period of time could produce stable output signal, the output signal of front end detecting diode can't restrain in the short time that each power continues, therefore can't be as the basis of automated power control.Therefore, Blu-ray Disc comprises the automated power control area solving this problem, but the beginning that CD-ROM device writes in data may not have the enough time so that reach stable Writing power.Therefore need method for a kind of automated power control of CD-ROM device use.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of method of calculating initial drive signal, to solve the problem that prior art exists.In an embodiment, one read head of described initial drive one CD-ROM device, described CD-ROM device is with cause one laser disc reading of data or write data to described laser disc, described laser disc comprises a plurality of automated powers control area and a plurality of data area, arrange described these automated power control areas and described these spaces, data area, and described method comprises: in described these automatic control areas, utilize the described read head of an initial drive to send a laser; Obtain a detecting intensity of described laser; And calculate one according to a described detecting intensity and a target strength and revise initial drive signal, the calculating of the initial drive signal of described correction comprises: (a) more described detecting intensity and described target strength are to produce a power level difference; (b) adjust described initial drive signal with initial drive signal in the middle of obtaining according to described power level difference; (c) obtain the initial drive signal strength in described centre; (d) repeating step (a) and (b), (c) are to determine the initial drive signal of described correction.
The present invention more provides a kind of automatic power control system, is used for a CD-ROM device.In an embodiment, described CD-ROM device has a read head, described read head has front end detecting diode, described CD-ROM device is with cause one laser disc reading of data or write data to described laser disc, described laser disc comprises a plurality of automated powers control area and a plurality of data area, and described automatic power control system comprises: a power initial value design module, and in described these automatic control areas, utilize the described read head of an initial drive to send a laser; An and compensator, obtain a detecting intensity of described laser by described front end detecting diode, and calculate one according to a described detecting intensity and a target strength and revise initial drive signal, described compensator calculates the initial drive signal of described correction according to following step: (a) more described detecting intensity and described target strength are to produce a power level difference; (b) adjust described initial drive signal with initial drive signal in the middle of obtaining according to described power level difference; (c) obtain the initial drive signal strength in described centre; (d) repeating step (a) and (b), (c) are to determine the initial drive signal of described correction.
The present invention also provides a kind of automatic power control system, use for a CD-ROM device to control the power of a laser, wherein said CD-ROM device comprises a read head and front end detecting diode, described read head receives an initial driving and forms signal to produce described laser, described front end detecting diode is detected described laser to produce an analog input signal, described automatic power control system comprises: an analog-to-digital converter is converted to a numerical data with described analog input signal; One compensator is coupled to described analog-to-digital converter, and when a compensation drive signal was enabled, the operation steps of described compensator is as follows: (a) a more described numerical data and a desired value were to produce a difference; (b) the described difference of foundation is adjusted described initial driving composition signal and is driven the composition data to obtain one, by a digital to analog converter data is formed in described driving and is converted to a middle initial driving composition signal; (c) obtain the initial driving in described centre and form signal intensity; (d) repeating step (a) and (b), (c) are to determine one to revise initial driving composition signal; One controller is coupled to described analog-to-digital converter and described compensator, the described compensation drive signal of activation; And a digital to analog converter, be coupled to described compensator, change described driving and form data and form signal for one of simulation pattern drives.
The invention provides a kind of method of automated power control, use for a CD-ROM device to control the power of a laser, wherein said CD-ROM device comprises a read head and front end detecting diode, described read head receives an initial driving and forms signal to produce described laser, described front end detecting diode is detected described laser to produce an analog input signal, and described method comprises the following steps: (a) activation one compensation drive signal; (b) when a digitizing drive signal is enabled, described analog input signal is converted to a numerical data; (c) when described compensation drive signal is enabled, a more described numerical data and a desired value are to produce a difference; (d) the described difference of foundation is adjusted described initial driving composition signal and is driven the composition data to obtain one, (e) described driving is formed data and is converted to a middle initial driving composition signal; (f) obtain the initial driving in described centre and form signal intensity; (g) repeating step (c), (d), (e), (f) are to determine one to revise initial driving composition signal.
For above-mentioned and other purposes of the present invention, feature and advantage can be become apparent, several preferred embodiments cited below particularly, and cooperate appended diagram, be described in detail below:
Description of drawings
Fig. 1 shows the relation between laser power and drive current;
The synoptic diagram of the signal that Fig. 2 is produced for existing automated power controlling mechanism;
Fig. 3 is the synoptic diagram of the signal that produces of the automated power controlling mechanism of Blu-ray Disc correspondence;
Fig. 4 is the foundation block diagram that comprises the CD-ROM device of automatic power control system of the present invention;
Fig. 5 is the process flow diagram that carries out the method for automated power control according to the present invention;
Fig. 6 is the synoptic diagram according to the sampling process of the analog input signal of front end detecting diode of the present invention generation;
Fig. 7 is the synoptic diagram according to the running of analog-to-digital converter of the present invention and compensator;
Fig. 8 is the process flow diagram according to the How It Works of compensator of the present invention;
Fig. 9 is the process flow diagram of the method switched according to the present invention between automated power control model and general power control mode;
Figure 10 is the foundation block diagram that comprises the CD-ROM device of automatic power control system of the present invention;
Figure 11 is the synoptic diagram according to the signal of an embodiment of automated power control program of the present invention;
Figure 12 is the foundation block diagram that comprises the CD-ROM device of automatic power control system of the present invention;
Figure 13 is the process flow diagram according to the automatic power control method of CD-ROM device of the present invention;
Figure 14 is the block diagram according to laser diode drive of the present invention;
Figure 15 is the synoptic diagram according to the relation between the performance number of laser of the present invention and driving enable signal;
Figure 16 is the block diagram according to compensator of the present invention;
Figure 17 is the synoptic diagram of the measured power of foundation laser diode of the present invention institute emitted laser;
Figure 18 is the synoptic diagram according to another embodiment of the measured power of laser diode of the present invention institute emitted laser;
Figure 19 is the synoptic diagram according to preposition burning program of the present invention;
Figure 20 is the synoptic diagram according to another embodiment of preposition burning program of the present invention.
Drawing reference numeral
(Fig. 4)
400～CD-ROM device;
402～write pulse generator;
404～sampling pulse generator;
410～front end detecting diode;
430～controller;
406～automatic power control system;
412a, 412b～sample-and-hold circuit;
411a, 411b～low-pass filter;
413～analog-to-digital converter;
414～compensator;
415～digital to analog converter;
416～laser diode drive;
418～laser diode;
(Figure 10)
700～CD-ROM device;
702～write pulse generator;
704～sampling pulse generator;
706～automatic power control system;
730～controller;
710～front end detecting diode;
706～automatic power control system;
712a, 712b～sampling keeps module;
711a, 711b～low-pass filter;
713～digital module;
722～analog-to-digital converter;
724,725～wave filter;
714～compensator;
728～compensating filter;
715～digital to analog converter;
716～laser diode drive;
718～laser diode;
(Figure 12)
100～CD-ROM device;
101～controller;
102～write pulse generator;
104～sampling pulse generator;
106～automatic power control system;
112～sample-and-hold circuit;
114～compensator;
116～laser diode drive;
118～laser diode;
110～front end detecting diode;
120～power initial value design module;
(Figure 14)
202,204,206,208,210～current amplifier;
214～laser diode;
(Figure 16)
300～compensator;
302～subtracter;
304～compensating filter.
Embodiment
The power of the laser that automatic power control system control CD player's read head is sent.Fig. 4 is the foundation block diagram that comprises the CD-ROM device 400 of automatic power control system 406 of the present invention.In an embodiment, CD-ROM device 400 comprises front end detecting diode 410, automatic power control system 406, laser diode drive 416 and laser diode 418.Laser diode drive 416 forms signal I1～I4 according to a plurality of drivings and a plurality of driving enable signal OE1～OE4 produces a drive current I.The watt level of laser can descend along with multiple function situation, and for example temperature rises or the laser disc rotating speed rises.Therefore automatic power control system 406 carries out an automated power control program with along with multiple function situation is adjusted the drive current I of laser diode 418, so that keep the power stability of the laser that laser diode 418 sends.
Front end detecting diode 410 is at first taken a sample output power of laser diode to obtain analog input signal R.Automatic power control system 406 is then adjusted to drive according to analog input signal R and is formed signal I1～I4.In an embodiment, automatic power control system 406 comprises and writes pulse generator 402, sampling pulse generator 404, controller 430, two sample-and-hold circuit 412a and 412b, two low-pass filter 411a and 411b, analog-to-digital converter 413, compensator 414, and digital to analog converter 415.In an embodiment, though the laser of a plurality of performance numbers of laser diode 418 emission tools, automatic power control system 406 only uses wherein two performance numbers to control all performance numbers.In an embodiment, this two power is Writing power and deletion power.Fig. 5 is the process flow diagram that carries out the method 900 of automated power control according to the present invention.At first, sampling keeps module 412a and 412b to take a sample an analog input signal R to obtain corresponding respectively to the two analog input signal Sa1 and the Sb1 (step 902) of Writing power and deletion power according to sample-pulse signal SH1 and SH2 respectively.Sampling pulse generator 404 generation sample-pulse signal SH1 and SH2 are to indicate corresponding Writing power of which section analog input signal R and deletion power.Low-pass filter 411a and 411b then filter analog input signal Sa1 and Sb1 to obtain signal Sa2 and Sb2.
When low-pass filter 411a and 411b began to produce signal Sa2 and Sb2, trap signal Sa2 and Sb2 were also unstable.Therefore, the time point (step 904) of controller 430 decision activation one digitizing drive signal AD_trig and a compensation drive signal Ctrl_trig.In an embodiment, when filtering signal Sa2 and Sb2 and stablize, controller 430 activation digitizing drive signal AD_trig.In an embodiment, controller 430 basis signal APC_area are to produce digitizing drive signal AD_trig and compensation drive signal Ctrl_trig.The laser disc surface that CD-ROM device 400 reads or writes is divided into automated power control area (APCarea) and data area, and wherein automated power control area and data area are apart from one another by arrangement.The data area is used to store general data, and the automated power control area is used for automated power control.Whether signal APC_area projects the automated power control area of laser disc in order to the laser of pilot light disc player.
When digitizing drive signal AD_trig is enabled, analog-to-digital converter 413 will filter back analog input signal Sa2 and Sb2 is converted to numerical data Sa3 and Sb3 (step 906).Same, when analog-to-digital converter 413 had just begun to produce numerical data Sa3 and Sb3, numerical data Sa3 and Sb3 were also unstable.Therefore, when numerical data Sa3 and Sb3 stablize, controller 430 activations compensation drive signal Ctrl_trig.When compensation drive signal Ctrl_trig activation, compensator 414 produces to drive according to numerical data Sa3 and Sb3 and a desired value forms signal d1, d2, d3, d4 (step 908).In an embodiment, compensator 414 relatively by the numerical data Sa3 of Writing power detecting gained and a target Writing power value producing a power level difference, and send the driving composition signal d3 of the laser of Writing power in order to the driving laser diode according to this power level difference adjustment.Because each performance number is all proportional, so other correction drives composition signal d1, d2, d4 can calculate to scale according to this power level difference.
It is that the simulation kenel is to obtain driving composition signal I1, I2, I3, I4 (step 910) from digital conversion that digital to analog converter 415 then will drive composition signal d1, d2, d3, d4.Then, laser diode drive 416 produces a drive current I (step 912) according to driving composition signal I1, I2, I3, I4 and driver enable signal OE1～OE4.Write pulse generator 402 generations and correspond respectively to driving composition signal I1, I2, I3, the driver enable signal OE1 of I4, OE2, OE3, OE4.When one of them was enabled whenever driver enable signal OE1, OE2, OE3, OE4, laser diode drive 416 is formed signal I1, I2, I3, I4 with corresponding driving, and one of them added to drive current I.At last, laser diode 418 produces the laser that has according to the power of drive current I decision, and finishes the automated power control program.Therefore, even the temperature change of laser diode 418, after the automated power control program carried out, laser diode 418 still can produce the laser with accurate power P.Afterwards, CD-ROM device 400 is proceeded data and is write.
Fig. 6 is the synoptic diagram according to the sampling process of the analog input signal of front end detecting diode of the present invention generation.When the automated power control program carried out, laser diode 418 throwed laser to one an automated power control area according to the control WSR that writes pulse generator 402.The conversion between two performance number I1, I2 of the power of laser.In an embodiment, laser is kept the time of 20T so that the output that front end detecting diode produces is stable in each performance number I1, I2.Front end detecting diode 410 needs time T 1 detecting the stabilization signal of performance number I2, and needs time T 2 to detect the stabilization signal of performance number I1.When analog input signal was stablized, sampling pulse generator 404 generation sampling pulse SH1 and SH2 were to drive sample-and-hold circuit 412a and 412b sampling simulation input signal, to obtain analog input signal Sa1 and Sb1.
Fig. 7 is the synoptic diagram according to the running of analog-to-digital converter 413 of the present invention and compensator 414.When laser diode 418 was positioned on the automated power control zone of laser disc, automatic power control system 400 carried out the automated power control program.When front end detecting diode 410 produces analog input signal, sampling pulse generator 404 produces in the sample-pulse signal SH1 instruction simulation input signal paragraph corresponding to first performance number, and sample-and-hold circuit 412a according to sample-pulse signal SH1 sampling simulation input signal to obtain analog input signal Sa1.When analog input signal Sa1 stablizes, controller 430 activation digitizing drive signal AD_trig, and analog-to-digital converter 413 beginning converting analogue input signals are numerical data Sa3.After numerical data Sa3 is stable, controller 430 activations compensation drive signal Ctrl_trig, and compensator 414 beginnings drive composition electric current I 1 according to the numerical data adjustment.
Compare with the ADC_area signal whether indication laser shines the automated power control zone, digitizing drive signal AD_trig have one time delay D1.AD_trig compares with the digitizing drive signal, the compensation drive signal have one time delay D2.In an embodiment, time delay, D1 and D2 were zero.In addition, even digitizing drive signal AD_trig does not produce, but still normal operation of automatic power control system 400.In an embodiment, controller 430 only produces the compensating movement of compensation drive signal Ctrl_trig with the driving compensator, and analog-to-digital converter 413 directly is not converted to Sa3 and Sb3 with simulating signal Sa2 and Sb2 according to the indication of digitizing drive signal AD_trig.
Fig. 8 is the process flow diagram according to the How It Works 500 of compensator 414 of the present invention.When sample-and-hold circuit 412a and 412b sampled data Sa1 and Sb1, analog-to-digital converter 413 produces numerical data Sa3 and Sb3 (step 502) according to data Sa1 and Sb1, and compensator 414 is adjusted driving composition current signal I1～I4 (step 504) according to numerical data Sa3 and Sb3.Otherwise as sample-and-hold circuit 412a and 412b not when sampled data Sa1 and Sb1, analog-to-digital converter 413 does not produce numerical data Sa3 and Sb3 (step 502), and compensator 414 is not adjusted to drive and formed current signal I1～I4 (step 506).In another embodiment, but analog-to-digital converter 413 direct sample analog input signals and not according to the action of sample-and-hold circuit 412a and 412b running, and compensator 414 suspension control signal Ctrl_trig control is formed electric current I 1～I4 to calculate to drive.
Aforementioned automated power control program is that the laser projections sent when laser diode 418 is carried out when (APC area) in the automated power control area.Therefore, aforementioned automated power control program is called as APC area automated power control model.Yet existing automated power control program is that enterprising line data is write fashionable carrying out in the data area, therefore is called as general automated power control model.General automated power control model makes a mistake when can be in the data burning speed of automatic power control system 400 too high.Therefore, the invention provides the method for between APC area automated power control model and general automated power control model, switching.Fig. 9 is the process flow diagram of the method 600 switched according to the present invention between APC area automated power control model and general automated power control model.When the data burning speed of automatic power control system 400 surpasses a boundary value (step 602), just adopt APC area automated power control model (step 602).When the data burning speed of automatic power control system 400 is lower than boundary value (step 602), just adopt general automated power control model (step 606).
Figure 10 is the foundation block diagram that comprises the CD-ROM device 700 of automatic power control system 706 of the present invention.Except digital module 713, compensator 714 and controller 730, the CD-ROM device 700 of Figure 10 is similar with the automatic power control system 400 of Fig. 4.In an embodiment, digital module 713 comprises analog-to-digital converter 722 and wave filter 724,725.Analog-to-digital converter 722 converting analogue input signal Sa2 and Sb2 are numerical data Sa3 and Sb3.When analog-to-digital converter 722 has just begun to produce numerical data Sa3 and Sb3, numerical data Sa3 and Sb3 instability.Therefore, when numerical data Sa3 and Sb3 stablize, controller 730 activation filtering drive signal F_trig_a and F_trig_b, and wave filter 724 and 725 then begins to filter numerical data Sa3 and Sb3 to obtain filtering numerical data Sa4 and Sb4.
Filter numerical data Sa4 and Sb4 and then be sent to compensator 714.In an embodiment, compensator 714 comprises two subtracters 726 and 727 and compensating filter 728.Subtracter 726 and 727 deducts from two desired value Sa* and Sb* respectively and filters numerical data Sa4 and Sb4 to obtain power level difference Sa5 and Sb5.Compensating filter 728 then filters power level difference Sa5 and Sb5 forms signal d1, d2, d3, d4 to obtain driving.When subtracter 726 and 727 has just begun to produce power level variance signal Sa5 and Sb5, power level variance signal Sa5 and Sb5 instability.After power level variance signal Sa5 and Sb5 were stable, controller 730 activations compensation drive signal Ctrl_trig filtered to drive compensating filter, forms signal d1, d2, d3, d4 thereby produce to drive.In addition, automatic power control system 700 can be only according to compensation drive signal Ctrl_trig running under the situation that does not have filtering drive signal F_trig_a and F_trig_b.In an embodiment, controller 730 only produces the compensation drive signal and filters to drive compensating filter 728, and wave filter 724 and 725 direct filtration numerical data Sa3 and Sb3 are to obtain filtering numerical data Sa4 and Sb4.In an embodiment, compensating filter 728 is an integrator.When compensation drive signal Ctrl_trig anergy, compensating filter is integrated signal and Sb5 not, forms signal d1, d2, d3, d4 and maintains size originally and drive.
Figure 11 is the synoptic diagram according to the signal of an embodiment of automated power control program of the present invention.When read head is above the data area, write pulse generator 402 and produce driving enable signal OE1～OE4, and the power of laser is shown in the first half of Figure 11 with control laser diode drive 416 generation drive current I.When read head write the data field with general data, drive current changed fast, and automatic power control system is difficult to stable detection signal size for calculating the correction drive signal.When read head is on the automated power control area, writes pulse generator 402 and produce driving enable signal OE1～OE4 with control laser diode 416 generation drive current I.In addition, the activation section of driving enable signal OE1～OE4 can be extended.For instance, compare with t2 with duration t1, the duration t3 and the t4 of two performance numbers are extended.Therefore front end detecting diode 410 can produce stable analog input signal R, and sample-and-hold circuit 412a and 412b can supply compensation to obtain reliable data Sa1 and Sb1 by sampling simulation input signal R.
Figure 12 is the foundation block diagram that comprises the CD-ROM device 100 of automatic power control system 106 of the present invention.In an embodiment, CD-ROM device 100 comprises automatic power control system 106, laser diode drive 116, laser diode 118, front end detecting diode 110.In an embodiment, automatic power control system 106 comprises controller 101, writes pulse generator 102, sampling pulse generator 104, sample-and-hold circuit 112, compensator 114 and power initial value design module 120.Laser diode drive 116 forms signal d1 according to a plurality of drivings and driving enable signal OEi produces a drive current I.Laser diode 118 is then launched laser according to the power P that drive current determined.In an embodiment, power initial value design module 120 is used for setting each and drives the initial current value of forming signal I1, I2, I3, I4 when burning begins.Therefore, CD-ROM device need determine initial drive current.
Figure 13 is the process flow diagram according to the automatic power control method 800 of CD-ROM device of the present invention.The surface hypothesis of laser disc is automated power control area and data area by difference, and arrange automated power control area and space, data area.The data area is used to store general data, and the automated power control area is used for automated power control.In an embodiment, laser disc is a Blu-ray Disc, and CD-ROM device utilizes the automated power control area to determine initial drive current for data burning.At first, controller 101 determines whether laser diode 118 projections one laser is in the automated power control area (step 802) of CD-RW discsCD-RW.When the automated power control area of laser projections in CD-RW discsCD-RW, controller 101 indications write the driving enable signal OEi that pulse generator 102 produces corresponding to test data.Otherwise controller 102 indications write the driving enable signal OEi that pulse generator 102 produces corresponding to general data.
When laser projections during in the automated power control area of CD-RW discsCD-RW, automatic power control system 106 begins to carry out initial drive signal calculation procedure, to set the initial drive signal that drives CD player's read head emission laser.When laser projections during in the automated power control area of CD-RW discsCD-RW, power initial value design module 120 produces initial driving and forms the laser (step 804) of signal for laser diode drive 116 driving laser diodes 118 emission tool power P.Laser diode 118 then throws the laser of at least one performance number P in the automated power control area according to drive current I.In an embodiment, this at least one performance number P comprises readout power, cooling power, deletion power and excessive driving power.
The size that front end detecting diode 110 is then detected laser-bounce light is to obtain detection signal R (step 806) that should at least one performance number P.When detection signal R roughly stablized, sampling pulse generator 104 produced sample-pulse signal SH.Sample-and-hold circuit 112 is then taken a sample the size of this detection signal R to obtain a plurality of detection signals size pi of respectively corresponding these performance numbers P according to sample-pulse signal SH.Because detection signal size pi and performance number P are proportional, so compensator 114 then calculates the initial drive signal di of a correction according to a detection signal size pi and a desired value.In an embodiment, compensator 114 producing a power level difference, and is adjusted initial drive signal to obtain revising initial drive signal di according to power level difference with detection signal size pi and desired value comparison.Revise that initial drive signal di is stored in that power initial value design module 120 writes for general data or initial next time drive signal is calculated.In an embodiment, the initial drive signal that is stored in the power initial value design module 120 all is updated in each initial drive signal calculation procedure.In another embodiment, be stored in initial drive signal in the power initial value design module 120 and be adjusted up to initial drive signal calculation procedure the generation stable result is arranged.
In an embodiment, the calculating of initial drive signal di comprises the following steps.At first, compensator 114 comparison detection signal intensity pi and this desired value are to produce a power level difference (step 808).Then, compensator 114 according to this this initial drive signal of power level difference adjustment to obtain initial drive signal di (step 810) in the middle of.Produce the laser power P of corresponding middle initial drive signal di when laser diode 118, front end detecting diode 110 detectings one detection signal R, and sample-and-hold circuit 112 is then taken a sample this detection signal R with initial drive signal strength pi (step 812) in the middle of obtaining.In an embodiment, after obtaining at least two detection signal intensity, compensator 114 is implemented an interpolation algorithm to obtain revising drive signal di.Automatic power control system 106 determines that then the power level difference of whether detecting intensity and target strength is arranged in a preset range (step 814).When power level difference is not arranged in preset range, automatic power control system 106 carries out step 808,810,812 till power level difference is arranged in preset range, so that laser power stability with pulling over.
Figure 14 is the block diagram according to laser diode drive 200 of the present invention.Laser diode drive 200 comprises a plurality of current amplifiers 202,204,206,208,210 and a totalizer 212.Each current amplifier is corresponding to a certain power value.For instance, current amplifier 202,204,206,208,210 corresponds respectively to readout power, cooling power, deletion power, Writing power and excessive driving power.Compensator 114 produces the driving that corresponds respectively to the different capacity value and forms signal d0, d1, d2, d3, d4.When the driving enable signal OE0 corresponding to readout power was enabled, current amplifier 202 amplifies corresponding to the driving of readout power formed signal d0 to obtain forming current i 0 corresponding to the driving that gets power.Current amplifier 204,206,208,210 operates in the mode that is same as current amplifier 202.Then, totalizer 212 will drive and form current i 0, i1, i2, i3, i4 and add up mutually to obtain a drive current I.Laser diode 214 then produces the laser that has corresponding to the power P of drive current I.For convenience of description, the embodiment of Figure 17～20 only comprises the number of the performance number that is less than Figure 14.
Figure 15 is the synoptic diagram according to the relation between the performance number P of laser of the present invention and driving enable signal OE0～OE4.The power of supposing laser sends readout power P0, excessive driving power P4, th writing power P 3, excessive driving power P4, cooling power P1 and deletion power P 2 sequentially.Readout power P0 need equal to drive the drive current of forming current i 0, therefore drives enable signal OE0 and at first is enabled and has the laser of readout power P0 for generation.Excessively driving power P4 need equal to drive the drive current of the sum total of forming current i 1, i2, i3, i4, therefore drives enable signal OE1, OE2, OE3, OE4 and then is enabled and has the laser of excessive driving power P4 for generation.Th writing power P 3 need equal to drive the drive current of the sum total of forming current i 1, i2, i3, therefore drives enable signal OE1, OE2, OE3 and then is enabled and has the laser of th writing power P 3 for generation.Cooling power P1 need equal to drive the drive current of forming current i 1, therefore drives enable signal OE1 and then is enabled and has the laser of cooling power P1 for generation.At last, deletion power P 2 need equal to drive the drive current of the sum total of forming current i 1, i2, therefore drives enable signal OE1, OE2 and then is enabled and has the laser of deletion power P 2 for generation.
Figure 16 is the block diagram according to compensator 300 of the present invention.Compensator 300 comprises a subtracter 302 and a compensating filter 304.In an embodiment, compensating filter 304 is an integrator.Subtracter 302 deducts a detection signal intensity pi of sample-and-hold circuit 112 generations to obtain a power level difference from a target power value Pi.Compensating filter 304 then drives composition signal di with power level difference integration to obtain one.Detection signal intensity pi, target power value Pi, driving are formed signal di corresponding to cooling power, deletion power, Writing power or excessive driving power.Because there is the frequency range restriction closed loop of automatic power control system, so the power of laser will become and stablely needs some transition times.Set when correct when initial value that drive to form signal di, the transition time can reduce to 0.Yet, drive the initial value of forming signal di and not only determine, more the Temperature Influence of Stimulated Light diode according to detection signal intensity pi, target power value Pi.Therefore need a kind of method that determines initial value.Therefore produce an initial value is delivered to compensator 114 to power initial value design module 120, and compensating filter 304 can begin to drive composition signal di according to initial value output.Follow-up laser diode drive 116 is then formed the laser power P of signal di generation drive current I with control laser diode 118 according to driving.
Figure 17 is the synoptic diagram according to the measured power of 118 emitted laser of laser diode of the present invention.When automatic power control system 106 begins to carry out the automated power control program, CD-ROM device moves to laser diode 118 top, automated power control area of laser disc.Laser diode 118 then penetrates in proper order has the laser of power P 4, P3, P2, P1 in the automated power control area.First performance number is excessive driving power P4, has continued the time of Tp4.Second performance number is th writing power P 3, continued the time of Tp3.The 3rd performance number is deletion power P 2, continued the time of Tp2.The 4th performance number is cooling power P1, continued the time of Tp1.Front end detecting diode 110 is then detected the reflected light of laser to obtain a detecting intensity, and wherein time T p1, Tp2, Tp3, Tp4 all are longer than and allow the time of detecting intensity stabilization.Therefore, compensator 114 can produce corresponding driving composition signal according to detecting intensity.Sample-and-hold circuit 112 obtains detecting intensity level p1, p2, p3, the p4 corresponding to performance number P1, P2, P3, P4 according to sampling pulse sampling detecting intensity, and compensator 114 produces to drive according to detecting intensity level p1, p2, p3, p4 and forms signal d0, d1, d2, d3, d4 producing the drive current I of laser diode drive 116, thereby makes laser diode 118 produce a laser.
Figure 18 is the synoptic diagram according to another embodiment of the measured power of 118 emitted laser of laser diode of the present invention.In an embodiment, laser diode 118 penetrate in proper order have power P 2, P3, P1 laser in the automated power control area.First performance number is deletion power P 2, has continued the time of Tp2.Second performance number is th writing power P 3, continued the time of Tp3.The 3rd performance number is cooling power P1, continued the time of Tp1.Front end detecting diode 110 is then detected the reflected light of laser to obtain a detecting intensity.Sample-and-hold circuit 112 obtains detecting intensity level p2, p3, the p1 corresponding to performance number P2, P3, P1 according to sampling pulse sampling detecting intensity, and compensator 114 produces to drive according to detecting intensity level p2, p3, p1 and forms signal d0, d1, d2, d3, d4 producing the drive current I of laser diode drive 116, thereby makes laser diode 118 produce a laser.
Among Figure 17,18 the embodiment, CD-ROM device 100 produces the laser of three kinds or four kinds performance numbers for power calculation.Sample-and-hold circuit 112 is then taken a sample corresponding to four kinds or three kinds of detection signal intensity of these performance numbers.Yet compensator 114 must be only produces five kinds according to four kinds or three kinds of detection signal intensity and drives and form signal d0, d1, d2, d3, d4.With reference to figure 1, the relation of drive current and laser power is determined by slope s (T) and difference electric current I th (T) under a specified temp T.Therefore, automatic power control system 106 can determine slope s (T) and difference electric current I th (T) according to the detection signal intensity of sample-and-hold circuit 112 samplings, and estimates that according to slope s (T) and difference electric current I th (T) all five of a corresponding certain power value drive composition signal magnitude d0, d1, d2, d3, d4.In an embodiment, it is as follows to estimate to drive the formula of forming signal magnitude d0, d1, d2, d3, d4 according to slope s (T) and difference electric current I th (T):
P0＝(i0-Ith(T))×s(T)；
P1＝(i1-Ith(T))×s(T)；
P2＝P1+i2×s(T)；
P3＝P2+i3×s(T)；
P4＝P3+i4×s(T)
Wherein P0 is a readout power, and P1 is a cooling power, and P2 is deletion power, and P3 is a Writing power, and P4 is excessive driving power, and i0, i1, i2, i3, i4 are that current signal is formed in the driving of Figure 15.
When CD-ROM device started, CD-ROM device 100 was not also known the temperature of laser diode 118.Therefore, laser diode drive 116 can't determine the slope of drive current I so that laser diode 118 produces the laser of appropriate power.Therefore CD-ROM device 100 carries out the automated power initial orders with calculated in advance drive current I before the formal burning data of CD-ROM device.The automated power initial orders are called preposition burning program again, and wherein the automated power control area of laser disc is in order to preposition burning, and the data area is for the general data burning.Figure 19 is the synoptic diagram according to preposition burning program of the present invention.In an embodiment, before the destination address in the CD-ROM device record data to laser disc, CD-ROM device writes test data to carry out preposition burning program in the automated power control area in destination address the place ahead.In other embodiment, before the destination address in the CD-ROM device record data to laser disc, CD-ROM device writes test data to carry out preposition burning program prior to arbitrary automated power control area, skips to the destination address burning data again.
After preposition burning program began, automatic power control system 106 carried out the first automated power control program in the first automated power control area, carried out adjusting the first time di with the catoptrical detecting intensity pi of foundation laser.When laser leaves the first automated power control area, automatic power control system 106 stops the emission of laser up to arriving the second automated power control area.Automatic power control system 106 then carries out other three automated power control programs one by one, carries out other three times with the catoptrical detecting intensity pi of foundation laser and adjusts, and these three times only for releasing example.When automated power control frequency range step-down or at present laser power be higher than the target laser power, automatic power control system 106 must carry out more times automated power control program in other automated power control areas, so that obtain the convergent laser power.At last, detection signal intensity pi equates with the target laser power, and the calculation procedure of drive current finishes.CD-ROM device then can be with correct laser power burning data in destination address.
Figure 20 is the synoptic diagram according to another embodiment of preposition burning program of the present invention.In preposition burning program, CD-ROM device 100 moves to the automated power control area of laser disc with the laser diode 118 of read head, and carries out the calculating with the power that carries out 4 laser of 4 automated power control programs in the automated power control area.In an embodiment, the automated power control area is the best automated power control area of laser disc.When the calculating to laser power Pi finishes, CD-ROM device can move to destination address with laser diode 118 and carry out normal burning.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limiting the present invention, any those who familiarize themselves with the technology, without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is when with being as the criterion that claims were defined.
Claims (16)
1. method of calculating initial drive signal, it is characterized in that, one read head of described initial drive one CD-ROM device, described CD-ROM device is with cause one laser disc reading of data or write data to described laser disc, described laser disc comprises a plurality of automated powers control area and a plurality of data area, arrange described these automated power control areas and described these spaces, data area, and described method comprises:
In described these automatic control areas, utilize the described read head of an initial drive to send a laser;
Obtain a detecting intensity of described laser; And
Calculate one according to a described detecting intensity and a target strength and revise initial drive signal, the calculating of the initial drive signal of described correction comprises:
(a) more described detecting intensity and described target strength are to produce a power level difference;
(b) adjust described initial drive signal with initial drive signal in the middle of obtaining according to described power level difference;
(c) obtain the initial drive signal strength in described centre; And
(d) repeating step (a) and (b), (c) are to determine the initial drive signal of described correction.
2. the method for the initial drive signal of calculating as claimed in claim 1 is characterized in that, described initial drive signal is used for driving a readout power, a cooling power, deletion power, a Writing power or an excessive driving power.
3. the method for the initial drive signal of calculating as claimed in claim 1 is characterized in that, described CD-ROM device is a Blu-ray Disc machine.
4. the method for the initial drive signal of calculating as claimed in claim 1 is characterized in that, described deciding step is to obtain at least two detecting intensity to carry out an interpolation formula to obtain the initial drive signal of described correction.
5. the method for the initial drive signal of calculating as claimed in claim 1 is characterized in that, described deciding step for the ground execution in step (a) and (b) of pulling over, (c) up to the described power level difference of described detecting intensity and described target strength in a preset range.
6. automatic power control system, it is characterized in that, described automatic power control system is used for a CD-ROM device, described CD-ROM device has a read head, described read head has front end detecting diode, described CD-ROM device is with cause one laser disc reading of data or write data to described laser disc, and described laser disc comprises a plurality of automated powers control area and a plurality of data area, and described automatic power control system comprises:
One power initial value design module in described these automatic control areas, utilizes the described read head of an initial drive to send a laser; And
One compensator is obtained a detecting intensity of described laser by described front end detecting diode, and is calculated one according to a described detecting intensity and a target strength and revise initial drive signal, and described compensator calculates the initial drive signal of described correction according to following step:
(a) more described detecting intensity and described target strength are to produce a power level difference;
(b) adjust described initial drive signal with initial drive signal in the middle of obtaining according to described power level difference;
(c) obtain the initial drive signal strength in described centre; And
(d) repeating step (a) and (b), (c) are to determine the initial drive signal of described correction.
7. automatic power control system as claimed in claim 6 is characterized in that, described initial drive signal is used for driving a readout power, a cooling power, deletion power, a Writing power or an excessive driving power.
8. automatic power control system as claimed in claim 6 is characterized in that, described CD-ROM device is a Blu-ray Disc machine.
9. automatic power control system as claimed in claim 6 is characterized in that, described compensator is obtained at least two detecting intensity to carry out an interpolation formula to obtain the initial drive signal of described correction.
10. automatic power control system as claimed in claim 6 is characterized in that, described compensator pull over ground execution in step (a) and (b), (c) up to the described power level difference of described detecting intensity and described target strength in a preset range.
11. automatic power control system, it is characterized in that, described automatic power control system is used for a CD-ROM device to control the power of a laser, wherein said CD-ROM device comprises a read head and front end detecting diode, described read head receives an initial driving and forms signal to produce described laser, described front end detecting diode is detected described laser to produce an analog input signal, and described automatic power control system comprises:
One analog-to-digital converter is converted to a numerical data with described analog input signal;
One compensator is coupled to described analog-to-digital converter, and when a compensation drive signal was enabled, the operation steps of described compensator was as follows:
(a) a more described numerical data and a desired value are to produce a difference;
(b) the described difference of foundation is adjusted described initial driving composition signal and is driven the composition data to obtain one, by a digital to analog converter data is formed in described driving and is converted to a middle initial driving composition signal;
(c) obtain the initial driving in described centre and form signal intensity; And
(d) repeating step (a) and (b), (c) are to determine one to revise initial driving composition signal;
One controller is coupled to described analog-to-digital converter and described compensator, the described compensation drive signal of activation; And
One digital to analog converter is coupled to described compensator, changes described driving and forms the driving composition signal of data for the simulation pattern.
12. automatic power control system as claimed in claim 11 is characterized in that, described automatic power control system also comprises:
At least one wave filter is coupled between described analog-to-digital converter and the described compensator, filters described numerical data when a filtering drive signal is enabled;
Wherein when automated power control is implemented, the described filtering drive signal of described controller activation.
13. automatic power control system as claimed in claim 11 is characterized in that, described compensator comprises:
At least one subtracter reduces described numerical data to obtain a power level difference from described desired value; And
One compensating filter filters described power level difference and forms data to produce described driving.
14. the method for an automated power control, it is characterized in that, the method of described automated power control is used for a CD-ROM device to control the power of a laser, wherein said CD-ROM device comprises a read head and front end detecting diode, described read head receives an initial driving and forms signal to produce described laser, described front end detecting diode is detected described laser to produce an analog input signal, and described method comprises the following steps:
(a) activation one compensation drive signal;
(b) when a digitizing drive signal is enabled, described analog input signal is converted to a numerical data;
(c) when described compensation drive signal is enabled, a more described numerical data and a desired value are to produce a difference;
(d) adjust described initial driving composition signal according to described difference and drive the composition data to obtain one,
(e) described driving is formed data and be converted to a middle initial driving composition signal;
(f) obtain the initial driving in described centre and form signal intensity; And
(g) repeating step (c), (d), (e), (f) are to determine one to revise initial driving composition signal.
15. the method for automated power control as claimed in claim 14 is characterized in that described method also comprises:
When a filtering drive signal is enabled, filter described numerical data with at least one wave filter.
16. the method for automated power control as claimed in claim 14 is characterized in that, the generation that data are formed in described at least one driving also comprises:
Reduce described numerical data to obtain a power level difference from described desired value; And
Filter described power level difference and form data to produce described driving.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US12/273,601 US7903006B2 (en) | 2006-06-05 | 2008-11-19 | Automatic power control system for optical disc drive and method thereof |
| US12/273,601 | 2008-11-19 | ||
| US12/603,762 US7948409B2 (en) | 2006-06-05 | 2009-10-22 | Automatic power control system for optical disc drive and method thereof |
| US12/603,762 | 2009-10-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110314181.1A Division CN102394074B (en) | 2008-11-19 | 2009-11-18 | Method for calibrating an initial driving signal for driving an optical pick-up head of an optical disk drive and automatic power control system |
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| CN101763866A CN101763866A (en) | 2010-06-30 |
| CN101763866B true CN101763866B (en) | 2011-12-14 |
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| CN2009102230933A Expired - Fee Related CN101763866B (en) | 2008-11-19 | 2009-11-18 | Automatic power control system for optical disc drive and method thereof |
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| TWI471080B (en) | 2011-03-11 | 2015-01-21 | Wistron Corp | Case and method of fastening electronic card |
| US20150255105A1 (en) * | 2014-03-07 | 2015-09-10 | Mediatek Inc. | Method for controlling power of laser emitting unit and associated apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1463423A (en) * | 2001-05-28 | 2003-12-24 | 索尼株式会社 | Optical recorder and laser power control method |
| CN1674110A (en) * | 2004-03-25 | 2005-09-28 | 三洋电机株式会社 | Optical disc device |
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| JP3972348B2 (en) * | 1997-07-02 | 2007-09-05 | ソニー株式会社 | Information recording / reproducing apparatus and method, and transmission medium |
| JP3987308B2 (en) * | 2001-07-24 | 2007-10-10 | 株式会社東芝 | Optical disc apparatus and data recording irradiation power control method |
| TW550555B (en) * | 2001-11-23 | 2003-09-01 | Aopen Inc | Automatic control method for generating stable laser power (ACSP) of a compact disk drive |
| TWI226625B (en) * | 2002-09-13 | 2005-01-11 | Mediatek Inc | Method for controlling output power of a pick-up head using automatic power control loop |
| TWI225190B (en) * | 2003-03-26 | 2004-12-11 | Media Tek Inc | Automatic power controller |
| US20050025018A1 (en) * | 2003-07-28 | 2005-02-03 | Han-Wen Hsu | Apparatus and method for automatic power control |
| TWI290640B (en) * | 2004-06-16 | 2007-12-01 | Mediatek Inc | Laser power controller and method for performing an auto power control |
| US20060239153A1 (en) * | 2005-04-25 | 2006-10-26 | Mediatek Incorporation | Methods and circuits for automatic power control |
| JP4691539B2 (en) * | 2006-11-16 | 2011-06-01 | 太陽誘電株式会社 | Recording power correction method and optical disk recording / reproducing apparatus |
| KR20090110987A (en) * | 2008-04-21 | 2009-10-26 | 삼성전자주식회사 | Optical disc driver and control method thereof |
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- 2009-11-18 CN CN201110314181.1A patent/CN102394074B/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1463423A (en) * | 2001-05-28 | 2003-12-24 | 索尼株式会社 | Optical recorder and laser power control method |
| CN1674110A (en) * | 2004-03-25 | 2005-09-28 | 三洋电机株式会社 | Optical disc device |
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| CN102394074A (en) | 2012-03-28 |
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