CN102402994A - Method and device for searching optimal focusing bias voltage and spherical aberration compensation value in optical drive - Google Patents
Method and device for searching optimal focusing bias voltage and spherical aberration compensation value in optical drive Download PDFInfo
- Publication number
- CN102402994A CN102402994A CN2010102832396A CN201010283239A CN102402994A CN 102402994 A CN102402994 A CN 102402994A CN 2010102832396 A CN2010102832396 A CN 2010102832396A CN 201010283239 A CN201010283239 A CN 201010283239A CN 102402994 A CN102402994 A CN 102402994A
- Authority
- CN
- China
- Prior art keywords
- bias voltage
- spherical aberration
- compensation value
- aberration compensation
- focusing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Optical Head (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
The invention discloses a method and a device for searching optimal spherical aberration compensation value and focusing bias voltage in optical drive. Firstly, the focusing bias voltage is fixed as a first focusing bias voltage, the spherical aberration compensation value is adjusted and the corresponding identification signal amplitude is worked out, and quadratic curve is made to work out first extreme value of the identification signal; next, the focusing bias voltage is fixed as a second focusing bias voltage, the spherical aberration compensation value is adjusted and the corresponding identification signal amplitude is worked out, and quadratic curve is made to work out second extreme value of the identification signal; then, the focusing bias voltage is fixed as a third focusing bias voltage, the spherical aberration compensation value is adjusted and the corresponding identification signal amplitude is worked out, and quadratic curve is made to work out third extreme value of the identification signal; finally, the three extreme values are compared, and combination of optimal focusing bias voltage and spherical aberration compensation value is decided according to the comparison result.
Description
Technical field
The present invention is relevant for the method and apparatus of seeking best spherical aberration compensation value in the CD-ROM device, and particularly relevant for the method and apparatus of seeking optimum focusing bias voltage and spherical aberration compensation value simultaneously
Background technology
The usefulness of CD-ROM device (performance) and the optical quality of its built-in system have greatest related, and spherical aberration (spherical aberration is called for short spherical aberration afterwards) promptly is to cause one of the key factor of the optical quality deterioration of built-in system.When the optical quality of CD-ROM device built-in system receives spherical aberration and influences; Focus error signal (the focus error signal that CD-ROM device produces; FE signal) with stride rail error signal (tracking error signal; TE signal) distortion easily causes the difficulty on the servocontrol, and makes CD-ROM device produce the situation of losing burnt (unfocused) or taking off lock (off-track) easily.Moreover the luminous point metaboly of its read/write laser of CD-ROM device that spherical aberration causes not only can cause data regenerated signal when reading dish (radio frequency signal, RF signal) more mistake to occur, CD-ROM device write also variation of quality.
Please refer to Fig. 1, its illustrate is the spherical aberration synoptic diagram.Mainly because of behind the laser beam process object lens 15, light beam (marginal rays) light beam (paraxial rays) paraxial with it of its axle far away has the existence of optical path difference Δ λ to the reason that spherical aberration produces to the focal plane.The influence of spherical aberration causes the light spot form (spot diagram) of laser on the focal plane to become elliptical shape.Yet light spot form should be circular preferably.In addition, the influence of spherical aberration makes that also the energy distribution of laser on the focal plane is relatively poor, has a strong impact on the quality of subsequent optical disc player read/write.
Usually the method that is used for compensating spherical aberration in the optical system has two, one, adopts the liquid crystal spherical-aberration compensator, and the 2nd, adopt collimation spherical-aberration compensator (collimating SA compensator).
The liquid crystal aberration compensator is made up of liquid crystal (liquid crystal) material usually.When the voltage of its pressurization changed, the refractive index of liquid crystal aberration compensator also changed along with the voltage of pressurization, and compensation makes its light spot form that arrives the focal plane for circular through the laser beam of liquid crystal aberration compensator whereby.Second method of compensation spherical aberration adopts liner ball difference compensator surely.The collimation spherical-aberration compensator is collimation lens.Its role is to move the position of collimation lens,, reach the effect of the optical path difference of revising paraxial beam and Axial Bundle far away, and then improve the problem of spherical aberration by the optical path difference that changes paraxial beam and Axial Bundle far away.That is to say,, can revise the optical path difference Δ λ of the light beam of the axle far away light beam paraxial to the focal plane with it with spherical aberration compensation value input spherical-aberration compensator.
Please refer to Fig. 2 A, 2B, 2C figure, its illustrate is the luminous point imaging analog result of CD-ROM device.Shown in Fig. 2 B, when the plastic layer (cover layer) of DVD CD-RW discsCD-RW during for 0.60mm and when 0 spherical aberration compensation value is provided, the best focal point position is at 0 place.When the DVD video disc causes its thickness when 0.6mm originally changes to 0.55mm because of technology variation, shown in Fig. 2 A figure, 50 μ m can be moved toward negative direction in the best focal point position; Yet when video disc thickness increases to 0.65mm because of the technology variation; Shown in Fig. 2 C; 50 μ m can be moved toward positive dirction in the best focal point position; No matter but be Fig. 2 A or Fig. 2 C, the optical signalling quality of its best focal point position is obvious deterioration all, and its luminous point size is all obviously greater than the luminous point size of best focal point position among Fig. 2 B.
In other words, when system produces spherical aberration, can cause the change of best focal point position, and must on the best focal point position after the change, look for corresponding spherical aberration compensation value, could really revise its optical aberration.In like manner, when adjusting the optical path difference of spherical aberration compensation value or laser beam,, also can cause the change of the best focal point position of CD-ROM device though revised spherical aberration.Therefore CD-ROM device is if will guarantee that the best focal point position is arranged; It also is the quality of best read/write; The best way is to adjust to focusing on bias voltage (FE bias) and these two parameters (variable) of spherical aberration compensation value (SA value) simultaneously, so that compact disc system has best optical quality.
Yet the prior art major part only provides the method for searching of spherical aberration compensation value.With the open case 2008/0074973 of the U.S. is example, and it provides the method for searching of a spherical aberration compensation value.Please refer to Fig. 3, it is the spherical aberration compensation value adjustment method synoptic diagram of the open case 2008/0074973 of the U.S..At first, the next signal as discriminating spherical aberration quality of amplitude TE Vpp of rail error signal is striden in its utilization.Then, try to achieve earlier that (what SA=-A) obtained strides rail error signal amplitude for SA=0, SA=A, utilizes do quafric curve and approach the spherical aberration compensation value SA_peak that strides rail error signal amplitude in the hope of corresponding maximum then at above-mentioned 3 in different spherical aberration compensation values.But if spherical aberration compensation value SA_peak then repeats above-mentioned steps to guarantee to obtain best spherical aberration compensation value not in its restricted portion always.Yet such adjustment mode is not also considered the fact that best focal point changes because of spherical aberration fully, even if cause having revised spherical aberration, yet focus point position (focus point) but is not in the optimum position.
Please refer to Fig. 4, its illustrate is spherical aberration compensation value and the influence graph of a relation of focusing bias voltage to optical aberration.Utilize distinguishing signal to judge the quality of spherical aberration this moment, and this distinguishing signal is the amount of error (reproduction jitter) of data regenerated signal.And more represent distinguishing signal more near extreme value toward inner ring, its signal quality is also just better.Suppose the system of CD-ROM device if the reference position (FB initial) that set to focus on bias voltage at the beginning just deviation local as shown in Figure 4 very; Even at this moment look for instantly best spherical aberration compensation value (SAoptiaml), its minimum position (being the best position of optical signalling) of corresponding spherical aberration in fact and in the anoptic system.Hence one can see that, adjusts to focusing on bias voltage (FE bias) and spherical aberration compensation value (SA value) simultaneously, just can obtain the focus point bias voltage best in the total system and the combination of spherical aberration compensation value.
United States Patent (USP) 7344077 promptly proposes one can adjust the method that focuses on bias voltage and spherical aberration compensation value simultaneously.The method mainly will focus on bias voltage and the spherical aberration compensation value is done the search of two dimension, and utilizes the point that searches to do quadric calculating (curve equation), to find best spherical aberration compensation value and to focus on bias voltage.Though these computing method can find preferable spherical aberration compensation value and the combination that focuses on bias voltage, yet quadric calculating is too complicated.The system resource and the memory body space of easy labor.Therefore, how effectively also to find the best focusing bias voltage and the combination of spherical aberration compensation value fast, making CD-ROM device obtain best optical quality will be emphasis of the present invention.
Summary of the invention
In view of this, the object of the present invention is to provide one to be used for the method and apparatus that CD-ROM device is sought best spherical aberration compensation value and focused on bias voltage.Effectively improve having the shortcoming of only considering the adjustment of spherical aberration compensation value but ignoring the adjustment of focus bias voltage now, and then improve the read/write quality of compact disc system.
Moreover the present invention proposes a kind of CD-ROM device that is used for and seeks best spherical aberration compensation value and the method that focuses on bias voltage, can't use too much system resource and memory body space.At first the fixed-focus bias voltage is the first focusing bias voltage, and adjustment spherical aberration compensation value is also tried to achieve its corresponding distinguishing signal amplitude, does first extreme value that quafric curve is tried to achieve distinguishing signal then.The fixed-focus bias voltage is the second focusing bias voltage again, and adjustment spherical aberration compensation value is also tried to achieve its corresponding distinguishing signal amplitude, does the secondary extremal that quafric curve is tried to achieve distinguishing signal then.Then the fixed-focus bias voltage is the 3rd focusing bias voltage, and adjustment spherical aberration compensation value is also tried to achieve its corresponding distinguishing signal amplitude, does the 3rd extreme value that quafric curve is tried to achieve distinguishing signal then.More above-mentioned three extreme values, and according to comparative result decision best focusing bias voltage and the combination of spherical aberration compensation value.
Wherein, this distinguishing signal is a servosignal, like radiofrequency signal RF, the lower envelope line RFBH of radiofrequency signal, recommends method seeking signal MPP etc.
Wherein, this distinguishing signal also can be the regenerated signal amount of error.
Moreover the present invention proposes a kind of CD-ROM device that is used for and seeks best spherical aberration compensation value and the method that focuses on bias voltage.At first fixedly the spherical aberration compensation value is the first spherical aberration compensation value, and adjustment focuses on bias voltage and tries to achieve its corresponding distinguishing signal amplitude, does first extreme value that quafric curve is tried to achieve distinguishing signal then.Fixedly the spherical aberration compensation value is the second spherical aberration compensation value again, and adjustment focuses on bias voltage and tries to achieve its corresponding distinguishing signal amplitude, does the secondary extremal that quafric curve is tried to achieve distinguishing signal then.Then fixedly the spherical aberration compensation value is the 3rd spherical aberration compensation value, and adjustment focuses on bias voltage and tries to achieve its corresponding distinguishing signal amplitude, does the 3rd extreme value that quafric curve is tried to achieve distinguishing signal then.More above-mentioned three extreme values, and according to comparative result decision best focusing bias voltage and the combination of spherical aberration compensation value.
Wherein, this distinguishing signal is a servosignal, like radiofrequency signal RF, the lower envelope line RFBH of radiofrequency signal, recommends method seeking signal MPP etc.
Wherein, this distinguishing signal also can be the regenerated signal amount of error.
For let above-mentioned and other purposes of the present invention, feature and advantage can be more obviously understandable, hereinafter is special lifts preferred embodiment, and conjunction with figs., elaborates as follows.
Description of drawings
Fig. 1 is the spherical aberration synoptic diagram.
Fig. 2 A, 2B, 2C are the luminous point imaging analog result of CD-ROM device.
Fig. 3 is the spherical aberration compensation value adjustment method synoptic diagram of the open case 2008/0074973 of the U.S..
Fig. 4 is spherical aberration compensation value and the influence graph of a relation of focusing bias voltage to optical aberration.
Fig. 5 is a compact disc system of the present invention.
Fig. 6 is the block schematic diagram of internal circuit of the present invention.
The first embodiment process flow diagram of Fig. 7 best spherical aberration compensation value and the combination that focuses on bias voltage for the present invention seeks.
Fig. 8 is the method synoptic diagram that first embodiment seeks the combination of best spherical aberration compensation value and focusing bias voltage.
Fig. 9 A, 9B are the method flow diagram of second embodiment of the invention.
Figure 10 is the synoptic diagram of the step 1009 and the step 1010 of second embodiment of the invention.
Figure 11 is the synoptic diagram of the step 1011 and the step 1012 of second embodiment of the invention.
Figure 12 is the synoptic diagram of the step 1013 and the step 1014 of second embodiment of the invention.
The main element symbol description:
100 CD-RW discsCD-RWs, 110 optical read heads, 111 object lens
112 collimating mirrors, 113 DVD LASER Light Sources, 114 spherical-aberration compensator
115 photodetectors, 116 CD LASER Light Sources, 119 BD LASER Light Sources
120 controllers, 121 digital signal processors, 122 microprocessors
710 ALUs, 720 peaks are to peak detecting device 730 control modules
740 arithmetic elements, 750 focus actuator, 760 memory bodys
801～808 method steps, 1001～1014 method steps
Embodiment
Please refer to Fig. 5, its illustrate is compact disc system of the present invention.Optical read head 110 comprises a blue light, and (Blu-ray, BD) LASER Light Source 119, a DVD LASER Light Source 113 and a CD LASER Light Source 116 are for the needs that read different video discs.BD LASER Light Source 119, DVD LASER Light Source 113 or CD LASER Light Source 116 focus on the data layer of video disc 100 after through collimating mirror 112 and object lens 111; And the laser light after the reflection can be incident upon on the photodetector 115; Convert light signal into electric signal, and this electric signal through digital signal processor (DSP) 121 computings in control module (controller) 120 can obtain detection signal such as radiofrequency signal (RF signal), radiofrequency signal lower envelope line RFBH, recommend method seeking signal MPP, stride the amount of error jitter of rail error signal TE and data regenerated signal etc.BD LASER Light Source 119, DVD LASER Light Source 113 or CD LASER Light Source 116 are opened in control module 120 decisions wherein; Also can cooperate CD-ROM drive motor; The control focus actuator moves the focus point position according to focusing on bias voltage (focus bias) value with object lens 111; And spherical aberration compensation value (SA value) is inserted in the spherical-aberration compensator (spherical compensator) 114,, improved the read/write quality of compact disc system whereby with the spherical aberration of compensating focusing luminous point to the video disc 100.
Generally speaking, the spherical aberration compensation value is provided by the manufacturer of optical read head.The present invention can adjust the spherical aberration compensation value that manufacturer provides according to situation, but also can directly not try to achieve best spherical aberration compensation value voluntarily with reference to above-mentioned spherical aberration compensation value.
Please refer to Fig. 6, it is the block schematic diagram of controller of the present invention.At first; When CD-ROM device reads CD-RW discsCD-RW 100; Control module 730 can be seen off according to the flow process of seeking optimum focusing bias voltage and spherical aberration compensation value and control signal to focus actuator 750 and spherical-aberration compensator 114; This moment, photodetector 115 just produced ABCD signal to arithmetic element 740 according to the result who reads CD-RW discsCD-RW 100, and wherein the ABCD signal is light intensity signal.
Therefore, arithmetic element 740 can produce a distinguishing signal according to this, and this distinguishing signal can be and recommended method seeking signal (MPP: (A+D)-(B+C)) this moment, strode the rail error signal TE signal (DPD signal or DPP signal) or the lower envelope (RFBH) of RF signal etc.And distinguishing signal get into the peak to peak detctor 720 after, can try to achieve its peak to peak value Vpp.Then, ALU 710 utilizes the peak of distinguishing signal that peak value Vpp is carried out the extreme value computing of quafric curve, obtains the best spherical aberration compensation value and the combination of focus point position whereby.Again control module 730 is passed through in best spherical aberration compensation value and the combination that focuses on bias voltage (FE bias) at last, send into spherical-aberration compensator 114 and focus actuator 750, drive optical head 110.In addition, arithmetic element 740, the peak can be realized through the mode of firmware peak detctor 720 and ALU 710.
Below seek best spherical aberration compensation value to the present invention now and make detailed description: please refer to Fig. 7, the first embodiment process flow diagram of its illustrate best spherical aberration compensation value and combination of focusing bias voltage for the present invention seeks with the method for the combination that focuses on bias voltage.
Step 801: declare dish and focus on the action completion.Step 802: when the focusing bias voltage was the first focusing bias voltage FB_initial, quafric curve was tried to achieve the spherical aberration compensation value FB_MID_MAXSA of corresponding distinguishing signal amplitude extreme value FB_MID_MAXSA_vpp.
Step 803: write down the first extreme value FB_MID_MAXSA_vpp
Step 804: when the focusing bias voltage was the second focusing bias voltage FB_initial+A, quafric curve was tried to achieve the spherical aberration compensation value FB_UP_MAXSA of corresponding distinguishing signal amplitude extreme value FB_UP_MAXSA_vpp.
Step 805: record secondary extremal FB_UP_MAXSA_vpp
Step 806: when the focusing bias voltage was the 3rd focusing bias voltage FB_initial-A, quafric curve was tried to achieve the spherical aberration compensation value FB_DN_MAXSA of corresponding distinguishing signal amplitude extreme value FB_DN_MAXSA_vpp.
Step 807: write down the 3rd extreme value FB_DN_MAXSA_vpp
Step 808: compare three extreme value FB_MID_MAXSA_vpp, FB_UP_MAXSA_vpp, FB_DN_MAXSA_vpp, and according to comparative result decision best focusing bias voltage and the combination of spherical aberration compensation value.
Please refer to Fig. 8, its to illustrate be the method synoptic diagram that first embodiment seeks best spherical aberration compensation value and the combination that focuses on bias voltage.When spherical aberration produced, the position of best focal point can be moved toward specific direction.And the oblique ellipse among Fig. 8 is to receive and focuses on bias voltage and influence the optical aberration distribution situation that causes with the spherical aberration compensation value.The distribution situation of the similar oblique ellipse of the distribution situation of this optical aberration, more past inner ring represents optical aberration more little.Also promptly be employed in the focusing bias voltage and the combination of spherical aberration compensation value of inner ring when compact disc system, its resulting optical quality is best, and the data regenerated signal margin of error is minimum also.
In order to find a zone in the plane, it focuses on the corresponding optimum signal quality with the combination of spherical aberration compensation value of bias voltage.The present invention utilizes nine points, tries to achieve the extreme value of three groups of quafric curves.Then compare the distinguishing signal under these three groups of extreme values, try to achieve the best zone of signal quality under this plane whereby.For instance, if distinguishing signal is the amplitude of striding rail error signal TE (amplitude, i.e. peak to peak value, TE Vpp), then corresponding distinguishing signal is peaked extreme value place, and best optical quality is arranged.In other words, the combination of pairing focusing bias voltage of this extreme value place and spherical aberration compensation value has best optical quality.
Please again with reference to figure 8.When focusing on the position that bias voltage (being FE bias:FB) is adjusted to the second focusing bias voltage FBinitial+A; And the spherical aberration compensation value is respectively the first spherical aberration compensation value SAinitial-B; The second spherical aberration compensation value SAinitial, the distinguishing signal amplitude TE Vpp that the 3rd spherical aberration compensation value SAinitial+B is corresponding is respectively P1; P2, P3.P1, P2 and P3 are done the computing of quafric curve, and can calculate its extreme value place is FB_UP_MAXSA.Measure second at the same time and focus on bias voltage FBinitial+A, and the spherical aberration compensation value is the pairing distinguishing signal amplitude of FB_UP_MAXSA FB_UP_MAXSA_vpp.
In like manner; When focus on bias voltage (being FE bias:FB) be adjusted to first focus on bias voltage FBinitial the position, and the spherical aberration compensation value is respectively the first spherical aberration compensation value SAinitial-B, the second spherical aberration compensation value SAinitial; The distinguishing signal amplitude TEVpp that the 3rd spherical aberration compensation value SAinitial+B is corresponding; Be respectively P4, P5, P6.P4, P5 and P6 are done the computing of quafric curve, and can calculate its extreme value place is FB_MID_MAXSA.Measure focus point position FBinitial at the same time, and the spherical aberration compensation value is the pairing distinguishing signal amplitude of FB_MID_MAXSA FB_MID_MAXSA_vpp.
In like manner; When focus on bias voltage (being FE bias:FB) be adjusted to the 3rd focus on bias voltage FBinitial-A the position, try to achieve when the spherical aberration compensation value and be respectively the first spherical aberration compensation value SAinitial-B, the second spherical aberration compensation value SAinitial; The distinguishing signal amplitude TE Vpp that the 3rd spherical aberration compensation value SAinitial+B is corresponding; Be respectively P7, P8, P9.P7, P8 and P9 are done the computing of quafric curve, and can calculate its extreme value place is FB_DN_MAXSA.Measure the 3rd spherical aberration compensation value FBinitial-A at the same time, and the spherical aberration compensation value is the pairing distinguishing signal amplitude of FB_DN_MAXSA FB_DN_MAXSA_vpp.
According to embodiments of the invention, relatively (FB_UP_MAXSA_vpp, FB_MID_MAXSA_vpp FB_DN_MAXSA_vpp), and obtain the focus point position and the spherical aberration compensation value of corresponding minimum optical aberration to these 3 distinguishing signal amplitude extreme values according to comparative result.With Fig. 8 is example, and relatively these 3 distinguishing signal amplitude extreme values can know that maximal value is FB_DN_MAXSA_vpp.So the 3rd of corresponding distinguishing signal amplitude FB_DN_MAXSA_vpp focuses on bias voltage FBinitial-A and its optical aberration of spherical aberration compensation value FB_DN_MAXSA combination is minimum; In other words; Adopt the combination of above-mentioned focus point position and spherical aberration compensation value, CD-ROM device just can have the optimum signal quality.
Therefore, main spirit of the present invention promptly is to utilize the extreme value of three quafric curves to calculate, and obtains distinguishing signal amplitude extreme value and corresponding spherical aberration compensation value thereof on these three lines again.Compare these three distinguishing signal amplitude extreme values then, and obtain best focusing bias voltage and the combination of spherical aberration compensation value of signal quality in the CD-ROM device according to the result of distinguishing signal amplitude comparison.
Yet the foregoing description elder generation fixed-focus point position is adjusted spherical aberration compensation value SA again, obtains that (P3) (P6) (P7, P8 behind distinguishing signal amplitude P9), calculate the spherical aberration compensation value of three groups of correspondence distinguishing signal amplitude extreme values for P4, P5 for P1, P2.And then compare these three groups of distinguishing signal amplitude extreme values, obtain the combination of optimum focusing bias voltage and spherical aberration compensation value.Yet the present invention does not limit the finding method that has only said sequence.The order of finding method also can be changed a little, also can obtain same effect.For example, earlier fixing spherical aberration compensation value SA value is adjusted focus point bias voltage FB again, obtains that (P7) (P8) (P3, P6 P9) reflect after other the signal amplitude value, calculate the focusing bias voltage of three groups of correspondence distinguishing signal amplitude extreme values for P2, P5 for P1, P4.And then compare these three groups of distinguishing signal amplitude extreme values, and obtain best focusing bias voltage and the combination of spherical aberration compensation value of signal quality in the CD-ROM device according to the result of distinguishing signal amplitude comparison.
Please refer to Fig. 9 A and 9B, its illustrate is the method flow diagram of second embodiment of the invention.
Step 1001: declare dish and focus on the action completion.
Step 1002: when the focusing bias voltage was the first focusing bias voltage FB_initial, quafric curve was tried to achieve the spherical aberration compensation value FB_MID_MAXSA of corresponding distinguishing signal amplitude extreme value FB_MID_MAXSA_vpp.
Step 1003: write down the first extreme value FB_MID_MAXSA_vpp
Step 1004: when the focusing bias voltage was the second focusing bias voltage FB_initial+A, quafric curve was tried to achieve the spherical aberration compensation value FB_UP_MAXSA of corresponding distinguishing signal amplitude extreme value FB_UP_MAXSA_vpp.
Step 1005: record secondary extremal FB_UP_MAXSA_vpp
Step 1006: when the focusing bias voltage was the 3rd focusing bias voltage FB_initial-A, quafric curve was tried to achieve the spherical aberration compensation value FB_DN_MAXSA of corresponding distinguishing signal amplitude extreme value FB_DN_MAXSA_vpp.
Step 1007: write down the 3rd extreme value FB_DN_MAXSA_vpp.
Step 1008: compare three extreme value FB_MID_MAXSA_vpp, FB_UP_MAXSA_vpp, FB_DN_MAXSA_vpp obtain the 4th extreme value.When the 4th extreme value is that FB_DN_MAXSA_vpp carry out step 1009; When the 4th extreme value is that FB_MID_MAXSA_vpp carry out step 1011; When the 4th extreme value is that FB_UP_MAXSA_vpp carry out step 1013.
Step 1009: setting FB_DN_MAXSA is the spherical aberration adjusted value, and quafric curve is tried to achieve the focusing bias voltage MAX_FB_DN of corresponding distinguishing signal amplitude extreme value MAX_FB_DN_vpp.
Step 1010: focus on the combination that bias voltage MAX_FB_DN and spherical aberration compensation value FB_DN_MAXSA are optimum focusing bias voltage and spherical aberration compensation value.
Step 1011: setting FB_MID_MAXSA is the spherical aberration adjusted value, and quafric curve is tried to achieve the focusing bias voltage MAX_FB_MID of corresponding distinguishing signal amplitude extreme value MAX_FB_MID_vpp.
Step 1012: focus on the combination that bias voltage MAX_FB_MID and spherical aberration compensation value FB_MID_MAXSA are optimum focusing bias voltage and spherical aberration compensation value.
Step 1013: setting FB_UP_MAXSA is the spherical aberration adjusted value, and quafric curve is tried to achieve the focusing bias voltage MAX_FB_UP of corresponding distinguishing signal amplitude extreme value MAX_FB_UP_vpp.
Step 1014: focus on the combination that bias voltage MAX_FB_UP and spherical aberration compensation value FB_UP_MAXSA are optimum focusing bias voltage and spherical aberration compensation value.
Please refer to Figure 10, its illustrate is the synoptic diagram of the step 1009 and the step 1010 of second embodiment of the invention.When to try to achieve FB_DN_MAXSA be best spherical aberration compensation value; Fixing this spherical aberration is mended adjusted value; Up the interval adjustment focuses on the bias voltage secondary, and measures the distinguishing signal amplitude that the focusing bias voltage is the 8th focusing bias voltage FB_initial-A+2C and the 9th focusing bias voltage FB_initial-A+C.Focus on bias voltage FB_initial-A+2C to the 8th; The distinguishing signal amplitude that the 3rd focusing bias voltage FB_initial-A and the 9th focuses on bias voltage FB_initial-A+C is done the computing of quafric curve, can calculate corresponding distinguishing signal amplitude extreme value MAX_FB_DN_vpp for focusing on bias voltage MAX_FB_DN.This focuses on the combination that bias voltage MAX_FB_DN and spherical aberration compensation value FB_DN_MAX_SA are optimum focusing bias voltage and spherical aberration compensation value in the optical system.
Please refer to Figure 11, its illustrate is the synoptic diagram of the step 1011 and the step 1012 of second embodiment of the invention.When to try to achieve FB_MID_MAX_SA be best spherical aberration compensation value; Fixing this spherical aberration is mended adjusted value; Reach up down at interval that adjustment focuses on bias voltage once, and measure that to focus on bias voltage be the 4th to focus on the distinguishing signal amplitude that bias voltage FB_initial+C and the 5th focuses on bias voltage FB_initial-A-C.Focus on bias voltage FB_initial+C to the 4th; The distinguishing signal amplitude that the first focusing bias voltage FB_initial and the 5th focuses on bias voltage FB_initial-C is done the computing of quafric curve, can calculate corresponding distinguishing signal amplitude extreme value MAX_FB_MID_vpp for focusing on bias voltage MAX_FB_MID.This focuses on the combination that bias voltage MAX_FB_MID and spherical aberration compensation value FB_MID_MAX_SA are optimum focusing bias voltage and spherical aberration compensation value in the optical system.
Please refer to Figure 12, its illustrate is the synoptic diagram of the step 1013 and the step 1014 of second embodiment of the invention.When to try to achieve FB_UP_MAX_SA be best spherical aberration compensation value; Fixing this spherical aberration is mended adjusted value; Down the interval adjustment focuses on the bias voltage secondary, and measures the distinguishing signal amplitude that the focusing bias voltage is the 6th focusing bias voltage FB_initial+A-2C and the 7th focusing bias voltage FB_initial+A-C.Focus on bias voltage FB_initial+A-2C to the 6th; The distinguishing signal amplitude that the 7th focusing bias voltage FB_initial+A-C and second focuses on bias voltage FB_initial+A is done the computing of quafric curve, can calculate corresponding distinguishing signal amplitude extreme value MAX_FB_UP_vpp for focusing on bias voltage MAX_FB_UP.This focuses on the combination that bias voltage MAX_FB_UP and spherical aberration compensation value FB_UP_MAX_SA are optimum focusing bias voltage and spherical aberration compensation value in the optical system.
The difference of the second embodiment of the invention and first embodiment is that focusing bias voltage that second embodiment is tried to achieve to first embodiment and the spherical aberration compensation value result quafric curve that tries again asks the action of extreme value, makes to focus on the requirement (requirement) that bias voltage and spherical aberration compensation value more can meet optical system.When optical system aberration conditional request is very strict, just must adopt the method for second embodiment.
In addition, two its distinguishing signals of embodiment adopt and stride rail error signal TE more than.Yet the present invention does not limit to use and strides rail error signal TE as distinguishing signal.Distinguishing signal also can replace with the servosignal relevant with optical aberration; Like radiofrequency signal RF, the lower envelope line RFBH of radiofrequency signal, the method for recommending stride that rail error signal MPP, differential push-pull method stride rail error signal DPP TE, the differential phase is striden rail error signal DPD TE etc.The amplitude of above-mentioned servosignal (amplitude:peak to peak value) size all has substantial connection with optical quality.Heal when big when the distinguishing signal amplitude, the representation signal quality better.So when the foregoing description adopted servosignal as distinguishing signal, the extreme value of being asked among the embodiment was maximal value.In other words, the focusing bias voltage of corresponding maximal servo signal amplitude and spherical aberration compensation value are focusing bias voltage best in the optical system and the combination of spherical aberration compensation value.
Yet, if the amount of error that embodiment uses regenerated signal is during as distinguishing signal, when the distinguishing signal amplitude more hour, the representation signal quality is better.So the amount of error that the foregoing description adopts regenerated signal is during as distinguishing signal, the extreme value of being asked among the embodiment is minimum value.In other words, the focusing bias voltage of the amount of error of corresponding minimum regenerated signal and spherical aberration compensation value are focusing bias voltage best in the optical system and the combination of spherical aberration compensation value.
It should be noted that the use of above this distinguishing signal of two types, can be simultaneously and with or use separately, the purpose optical quality that is to offer the best uses for the read/write CD-RW discsCD-RW.The present invention selects distinguishing signal mode preferably, after focusing, follows to utilize before the rail and recommends the distinguishing signal of the lower envelope line RFBH of method seeking signal MPP or radiofrequency signal as optical aberration.Yet, the lock rail then uses the distinguishing signal of the amount of error of regenerated signal after accomplishing as optical aberration.
Whether lower envelope line RFBH and the CD-RW discsCD-RW in addition, selecting to recommend method seeking signal MPP or radiofrequency signal have data that relation is also arranged.Blank video disc is recommended the distinguishing signal of method seeking signal MPP as optical aberration because there is not any data of burning so can only use.But CD-ROM sheet (ROM) just can use the lower envelope line RFBH that recommends method seeking signal MPP or radiofrequency signal to come the distinguishing signal as optical aberration.
Therefore, advantage of the present invention utilizes three quafric curves to ask the extreme value of distinguishing signal and the focusing bias voltage and the spherical aberration compensation value of correspondence thereof, and three ratio of extreme values that collocation is tried to achieve, can find out the best zone of optical signalling on the plane.This measure solution prior art is only considered the adjustment of spherical aberration compensation value but is ignored the shortcoming that the focus bias voltage is adjusted.Though being arranged, prior art total system is tried to achieve the combination of optimum focusing bias voltage and spherical aberration compensation value as quadric surface.Yet quadric calculating is consume system resources not only; And its calculative counting maybe be more; And must store the data more than 9 simultaneously, could do computing, but this method is done the calculating of quafric curve; Only need store 3 data simultaneously just can do the extreme value computing, so the more efficient and elasticity of meeting of the present invention.
Claims (22)
1. one kind is used for the method that CD-ROM device is sought best spherical aberration compensation value and focused on bias voltage, and wherein this CD-ROM device comprises a focus actuator and a spherical-aberration compensator, it is characterized in that comprising the following steps:
Import one first focusing and be biased into this focus actuator, utilize the quafric curve computing to try to achieve first extreme value of a distinguishing signal;
Import one second focusing and be biased into this focus actuator, utilize the quafric curve computing to try to achieve the secondary extremal of this distinguishing signal;
Import one the 3rd focusing and be biased into this focus actuator, utilize the quafric curve computing to try to achieve the 3rd extreme value of this distinguishing signal; And
This first extreme value relatively, this secondary extremal and the 3rd extreme value, and according to its comparative result decision best focusing bias voltage and the combination of spherical aberration compensation value.
2. the method for claim 1 is characterized in that, this distinguishing signal is a servosignal, comprises striding rail error signal TE, recommends the lower envelope line RFBH of method seeking signal MPP or radiofrequency signal.
3. method as claimed in claim 2 is characterized in that, this first extreme value, and the combination of pairing focusing bias voltage of the maximum and spherical aberration compensation value is best focusing bias voltage and the combination of spherical aberration compensation value in secondary extremal and the 3rd extreme value.
4. method as claimed in claim 3 is characterized in that, more comprises the following step:
When comparative result was first extreme value maximum, fixedly the spherical aberration compensation value was the spherical aberration compensation value of corresponding first extreme value;
It is the first focusing bias voltage that adjustment focuses on bias voltage, and the 4th focuses on bias voltage and the 5th focuses on bias voltage, and tries to achieve its each self-corresponding distinguishing signal amplitude; And
According to the first focusing bias voltage, the 4th focuses on bias voltage, and the 5th focusing bias voltage and each self-corresponding distinguishing signal amplitude thereof are done the quafric curve computing and tried to achieve best focusing bias voltage and the combination of spherical aberration compensation value.
5. method as claimed in claim 3 is characterized in that, more comprises the following step:
When comparative result was the secondary extremal maximum, fixedly the spherical aberration compensation value was the spherical aberration compensation value of corresponding secondary extremal;
It is the second focusing bias voltage that adjustment focuses on bias voltage, and the 6th focuses on bias voltage and the 7th focuses on bias voltage, and tries to achieve its each self-corresponding distinguishing signal amplitude; And
According to the second focusing bias voltage, the 6th focuses on bias voltage, and the 7th focusing bias voltage and each self-corresponding distinguishing signal amplitude thereof are done the quafric curve computing and tried to achieve best focusing bias voltage and the combination of spherical aberration compensation value.
6. method as claimed in claim 3 is characterized in that, more comprises the following step:
When comparative result was the 3rd extreme value maximum, fixedly the spherical aberration compensation value was the spherical aberration compensation value of corresponding the 3rd extreme value;
It is the 3rd focusing bias voltage that adjustment focuses on bias voltage, and the 8th focuses on bias voltage and the 9th focuses on bias voltage, and tries to achieve its each self-corresponding distinguishing signal amplitude; And
According to the 3rd focusing bias voltage, the 8th focuses on bias voltage, and the 9th focusing bias voltage and each self-corresponding distinguishing signal amplitude thereof are done quafric curve and tried to achieve best focusing bias voltage and the combination of spherical aberration compensation value.
7. the method for claim 1 is characterized in that, this distinguishing signal is the regenerated signal margin of error.
8. method as claimed in claim 7 is characterized in that, this first extreme value, and the combination of pairing focusing bias voltage of reckling and spherical aberration compensation value is best focusing bias voltage and the combination of spherical aberration compensation value in secondary extremal and the 3rd extreme value.
9. method as claimed in claim 8 is characterized in that more comprising the following step:
When comparative result be first extreme value hour, try to achieve the first spherical aberration compensation value and first that should first extreme value focused on bias voltage; Fixedly the spherical aberration compensation value is the first spherical aberration compensation value, and it is the first focusing bias voltage that adjustment focuses on bias voltage, and the 4th focuses on bias voltage and the 5th focuses on bias voltage, and tries to achieve its each self-corresponding distinguishing signal amplitude; And
According to the first focusing bias voltage, the 4th focuses on bias voltage, and the 5th focusing bias voltage and each self-corresponding distinguishing signal amplitude thereof are done the quafric curve computing and tried to achieve best focusing bias voltage and the combination of spherical aberration compensation value.
10. method as claimed in claim 8 is characterized in that more comprising the following step:
When comparative result be secondary extremal hour, fixedly the spherical aberration compensation value is the spherical aberration compensation value of corresponding secondary extremal;
It is the second focusing bias voltage that adjustment focuses on bias voltage, and the 6th focuses on bias voltage and the 7th focuses on bias voltage, and tries to achieve its each self-corresponding distinguishing signal amplitude; And according to the second focusing bias voltage, the 6th focuses on bias voltage, and the 7th focusing bias voltage and each self-corresponding distinguishing signal amplitude thereof are done the quafric curve computing and tried to achieve best focusing bias voltage and the combination of spherical aberration compensation value.
11. method as claimed in claim 8 is characterized in that more comprising the following step:
When comparative result be the 3rd extreme value hour, try to achieve the 3rd spherical aberration compensation value and the 3rd that should the 3rd extreme value focused on bias voltage;
Fixedly the spherical aberration compensation value is the 3rd spherical aberration compensation value, and it is the 3rd focusing bias voltage that adjustment focuses on bias voltage, and the 8th focuses on bias voltage and the 9th focuses on bias voltage, and tries to achieve its each self-corresponding distinguishing signal amplitude; And
According to the 3rd focusing bias voltage, the 8th focuses on bias voltage, and the 9th focusing bias voltage and each self-corresponding distinguishing signal amplitude thereof are done the quafric curve computing and tried to achieve best focusing bias voltage and the combination of the spherical aberration value of repaying.
12. the method for claim 1; It is characterized in that; This first extreme value fixed-focus bias voltage is this first focusing bias voltage, and adjustment spherical aberration compensation value is the first spherical aberration compensation value, the second spherical aberration compensation value and the 3rd spherical aberration compensation value; And try to achieve its each self-corresponding distinguishing signal amplitude, and then do the quafric curve computing according to the spherical aberration compensation value of those adjustment and corresponding distinguishing signal amplitude thereof and get it.
13. the method for claim 1; It is characterized in that; This secondary extremal fixed-focus bias voltage is this second focusing bias voltage, and adjustment spherical aberration compensation value is the first spherical aberration compensation value, the second spherical aberration compensation value and the 3rd spherical aberration compensation value; And try to achieve its each self-corresponding distinguishing signal amplitude, and then do the quafric curve computing according to the spherical aberration compensation value of those adjustment and corresponding distinguishing signal amplitude thereof and get it.
14. the method for claim 1; It is characterized in that; This secondary extremal fixed-focus bias voltage is the 3rd focusing bias voltage, and adjustment spherical aberration compensation value is the first spherical aberration compensation value, the second spherical aberration compensation value and the 3rd spherical aberration compensation value; And try to achieve its each self-corresponding distinguishing signal amplitude, so do the quafric curve computing according to the spherical aberration compensation value of those adjustment and corresponding distinguishing signal amplitude thereof again and get it.
15. one kind is used for CD-ROM device and seeks best spherical aberration compensation value and the method that focuses on bias voltage, wherein, this CD-ROM device comprises a focus actuator and a spherical-aberration compensator, it is characterized in that comprising the following steps:
Import one first spherical aberration compensation value to this spherical-aberration compensator, utilize the quafric curve computing to try to achieve first extreme value of distinguishing signal;
Import one second spherical aberration compensation value to this spherical-aberration compensator, utilize the quafric curve computing to try to achieve the secondary extremal of this distinguishing signal;
Import one the 3rd spherical aberration compensation value to this spherical-aberration compensator, utilize the quafric curve computing to try to achieve the 3rd extreme value of this distinguishing signal; And
This first extreme value relatively, this secondary extremal and the 3rd extreme value, and according to its comparative result decision best focusing bias voltage and the combination of spherical aberration compensation value.
16. method as claimed in claim 15 is characterized in that, this distinguishing signal is a servosignal, comprises striding rail error signal TE, recommends the lower envelope line RFBH of method seeking signal MPP or radiofrequency signal.
17. method as claimed in claim 16 is characterized in that, this first extreme value, and the combination of pairing focusing bias voltage of the maximum and spherical aberration compensation value is best focusing bias voltage and the combination of spherical aberration compensation value in secondary extremal and the 3rd extreme value.
18. method as claimed in claim 15 is characterized in that, this distinguishing signal is the regenerated signal margin of error.
19. method as claimed in claim 18 is characterized in that, this first extreme value, and the combination of pairing focusing bias voltage of reckling and spherical aberration compensation value is best focusing bias voltage and the combination of spherical aberration compensation value in secondary extremal and the 3rd extreme value.
20. method as claimed in claim 15; It is characterized in that; This first extreme value fixed-focus bias voltage is this first spherical aberration compensation value, and it is the first focusing bias voltage that adjustment focuses on bias voltage, and second focuses on bias voltage and the 3rd focuses on bias voltage; And try to achieve its each self-corresponding distinguishing signal amplitude, and then do the quafric curve computing according to the focusing bias voltage of those adjustment and corresponding distinguishing signal amplitude thereof and get it.
21. method as claimed in claim 15; It is characterized in that; This secondary extremal fixed-focus bias voltage is this second spherical aberration compensation value, and it is the first focusing bias voltage that adjustment focuses on bias voltage, and second focuses on bias voltage and the 3rd focuses on bias voltage; And try to achieve its each self-corresponding distinguishing signal amplitude, and then do the quafric curve computing according to the focusing bias voltage of those adjustment and corresponding distinguishing signal amplitude thereof and get it.
22. method as claimed in claim 15; It is characterized in that; The 3rd extreme value fixed-focus bias voltage is this second spherical aberration compensation value, and it is the first focusing bias voltage that adjustment focuses on bias voltage, and second focuses on bias voltage and the 3rd focuses on bias voltage; And try to achieve its each self-corresponding distinguishing signal amplitude, and then do the quafric curve computing according to the focusing bias voltage of those adjustment and corresponding distinguishing signal amplitude thereof and get it.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102832396A CN102402994A (en) | 2010-09-16 | 2010-09-16 | Method and device for searching optimal focusing bias voltage and spherical aberration compensation value in optical drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102832396A CN102402994A (en) | 2010-09-16 | 2010-09-16 | Method and device for searching optimal focusing bias voltage and spherical aberration compensation value in optical drive |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102402994A true CN102402994A (en) | 2012-04-04 |
Family
ID=45885139
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102832396A Pending CN102402994A (en) | 2010-09-16 | 2010-09-16 | Method and device for searching optimal focusing bias voltage and spherical aberration compensation value in optical drive |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102402994A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1505815A (en) * | 2001-04-25 | 2004-06-16 | �ձ������ȷ湫˾ | Information reproducing apparatus and optical recording medium |
| US20070097809A1 (en) * | 2005-10-28 | 2007-05-03 | Canon Kabushiki Kaisha | Method of adjusting spherical aberration and focus offset in optical disk apparatus and optical disk apparatus using the same |
| CN101174434A (en) * | 2006-09-26 | 2008-05-07 | 索尼日电光领有限公司 | Optical recording medium driving device and spherical aberration adjustment method |
| CN101315781A (en) * | 2007-05-30 | 2008-12-03 | 飞利浦建兴数位科技股份有限公司 | Focusing control method for reading/writing optical disc |
-
2010
- 2010-09-16 CN CN2010102832396A patent/CN102402994A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1505815A (en) * | 2001-04-25 | 2004-06-16 | �ձ������ȷ湫˾ | Information reproducing apparatus and optical recording medium |
| US20070097809A1 (en) * | 2005-10-28 | 2007-05-03 | Canon Kabushiki Kaisha | Method of adjusting spherical aberration and focus offset in optical disk apparatus and optical disk apparatus using the same |
| CN101174434A (en) * | 2006-09-26 | 2008-05-07 | 索尼日电光领有限公司 | Optical recording medium driving device and spherical aberration adjustment method |
| CN101315781A (en) * | 2007-05-30 | 2008-12-03 | 飞利浦建兴数位科技股份有限公司 | Focusing control method for reading/writing optical disc |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100412955C (en) | Optical disk apparatus, focal position control method and focal position control apparatus | |
| CN102054494A (en) | Optical pickup apparatus | |
| US7551526B2 (en) | Disk drive apparatus and spherical aberration correcting method | |
| US7307927B2 (en) | Optical disk apparatus and method for recording and reproducing an optical disk | |
| CN1158650C (en) | Optical pick-up device, optical disk apparatus and method for detecting orbit identification signal | |
| CN101950569B (en) | Optical pickup and optical disc drive | |
| EP2290647A1 (en) | Objective lens and optical pickup comprising the objective lens | |
| JP5403769B2 (en) | Guide layer separation type optical recording medium, optical recording medium drive device, and recording layer access method | |
| US8363516B2 (en) | Method and apparatus for compensating astigmatism in an optical storage system | |
| US20120213052A1 (en) | Optical head, optical disc device, information processing device, and objective lens | |
| JPWO2006109414A1 (en) | Optical recording / reproducing apparatus and focus search method | |
| KR101307541B1 (en) | Method for controlling focus of optical information storing media and apparatus thereof | |
| CN102402994A (en) | Method and device for searching optimal focusing bias voltage and spherical aberration compensation value in optical drive | |
| US8385180B2 (en) | Optical pickup apparatus | |
| CN102789787A (en) | Recording apparatus and servo control method | |
| CN100394493C (en) | Optical pickup device, optical recording and/or reproducing apparatus using the same, and method for detecting tracking error signal | |
| JP2006018974A (en) | Information recorder and information recording medium | |
| US8000187B2 (en) | Optical disc device | |
| JPH11353681A (en) | Optical reproducing device and optical recording medium | |
| CN101681642B (en) | Optical head device and optical disc device | |
| CN100587816C (en) | Method and device for compensating astigmatic difference of CD driver | |
| US7280445B2 (en) | Optical pick-up | |
| KR20100106223A (en) | Optical pickup device and objective lens | |
| CN101261866A (en) | Method of reproducing information from optical disc and optical disc reproducing apparatus using the same | |
| WO2008136315A1 (en) | Optical pickup and optical information processing device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120404 |