CN1925018A - Servosystem regulation device for disc drive - Google Patents
Servosystem regulation device for disc drive Download PDFInfo
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- CN1925018A CN1925018A CN 200510029366 CN200510029366A CN1925018A CN 1925018 A CN1925018 A CN 1925018A CN 200510029366 CN200510029366 CN 200510029366 CN 200510029366 A CN200510029366 A CN 200510029366A CN 1925018 A CN1925018 A CN 1925018A
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Abstract
This invention relates to disc drive servo system adjusting device, which comprises the following parts: light picking device to send laser onto disc medium; servo system device to adjust focus and trace on the above light picking device; ring adjusting device by use of above servo system wrong signals and control signals on the servo system.
Description
Technical field
The invention relates to the technology of CD drive, especially about the invention of the servosystem regulation device of CD drive.
Background technology
Now, people more and more emphasize the storage of optical disc drive system and read the high power speedization of action.The high performance of the servo-drive system of focusing/tracking that relevant with this present situation is also is absolutely necessary.
In addition, design for the servo-drive system of CD drive, generally speaking, in the performance of the servo-drive system of paying attention to CD drive, higher requirement has also been proposed simultaneously to the driving of light picker or various IC and to the stability of the deviation of signal.And these require item may store mutual conflict and interactional place.Therefore, in order to ensure the stability of the servo-drive system under the influence of various deviations, on the aspect of guaranteeing the servo-drive system performance, just need detect its suffered damage.
In order to overcome these problems, just various deviation composition quantification need be revised it then.Therefore, now people have worked out several different methods, thereby can be implemented in when servo-drive system designed, and can make its performance maximization.Wherein, generally speaking, a kind of method of commonplace use is exactly that loop gain is regulated method, it is that the phase differential that error signal had according to the servo-drive system that the reference signal of the crossover frequency nearside of closed-loop control system is followed the tracks of detects, then, the phase differential that is produced is inferred in advance.Then, according to above-mentioned institute prediction result relevant value is set again, and the loop gain of servo-drive system is regulated.Thereby just can revise the loop gain deviation.
As mentioned above, for top mention concerning the method that the loop gain deviation is revised, exactly in order to make the intersection high frequency that becomes servo-drive system from the correlated frequency by the frequency nearside of the reference signal of servo-drive system approval of outside input, and the wave filter of benchmark servo-drive system is designed, then, making after servo-drive system starts working, if system can approve the reference signal of the indefinite frequency of spy.So, servo-drive system is just to can this situation following the tracks of.In this case, according to the above-mentioned result who follows the tracks of, above-mentioned tracking error signal that produces and reference signal will produce phase differential.In this case, the loop gain of above-mentioned phase differential that produces and servo-drive system has very big relevance.
Therefore, in the process that phase differential is designed in advance, if loop gain is regulated according to the correlation of being considered.So, just can set, thereby just can revise the deviation of the loop gain that produced by various deviation situations to the loop gain of servo-drive system.
For the loop gain of regulating by said process, in fact, it is property ground model that is used for Servo System Design and loop gain departure that representative system had quantitatively.After, even, also can use this circuit gain value fast with servo for the high power of being used.Then, just can be corresponding with the loop gain deviation, and the performance of raising servo-drive system.
As mentioned above, in early days, when the signal of various servo-drive systems is regulated, can the typical value of CD All Ranges will be used as from the value that the specific region obtained of media CD.Then, with regulate or carry out under the situation of the not corresponding to low power speed of doubly speed of physical record/read, in general can both be adjusted.For the various media CDs that should carry out the record of data and read, for the interior week and the periphery of CD, the characteristic of the reflection of CD can change.Like this, different along with track pitch and storage area, the situation that the characteristic of its reflection is also inequality will appear.Like this, the adjusting to servo-drive system also will correspondingly change.This is its existing shortcoming.
In addition, along with the doubly increase of speed, the media CD that reveals the trend that changes for the property list of finding the servo-drive system signal, in the process that loop gain is regulated, different storage zone for the media CD, in fact, be impossible make the variation of the deviation that produced and volume reflection and track pitch corresponding.Like this, wanting to make its deviation that produces according to the difference between times speed of regulating doubly fast and actual use is very difficult with doubly speed is corresponding.This is its existing another one problem.
Summary of the invention
Therefore, the present invention above-mentionedly proposes according to the problem that conventional art produced for solving.The objective of the invention is to provide a kind of regulating device of servo-drive system of CD drive for the user, like this, can detect in real time reality doubly speed of using and the signal that representative is actually used in the deviation that system produced of storing/reading the zone, then, according to the characteristic of the above-mentioned signal that detects various departures are carried out more correct detection again.Then, just contrast above-mentioned testing result, the performance of servo-drive system is improved, thereby make its performance reach maximization.
To achieve these goals, servosystem regulation device according to the CD drive of embodiments of the invention, first feature, for the driver that is used for the CD that high power speed stores/read, it has the feature that is made of following components: the optical Pickup device that optical disc medium is carried out laser radiation; To the focusing of above-mentioned light picker with follow the tracks of focusing/tracking servo device that action is controlled; Utilize the rub-out signal of above-mentioned servo-drive system and the annular regulating device that control signal is regulated servo-drive system in real time.
More satisfactory situation is that above-mentioned annular regulating device is made of following components: the band filter that the centre frequency and the band filter of light picker signal are set; To the centre frequency of the signal of filtering and the frequency/amplitude pick-up unit that amplitude detects by above-mentioned band filter; Change condition and annular regulating device algorithm device that servo-drive system is regulated according to the frequency of the signal of above-mentioned detection and amplitude and according to the loop shape of having set.
Said frequencies/amplitude detecting device is by triggering constantly input from FG signal that spindle motor obtained, then, 0 of this high-frequency signal after constantly intersected constantly as detecting the moment, and in the specific time time is detected.Then, with the value equalization that is detected.Then, again to removing of being comprised in the signal, thereby just can the SN ratio of the desirable signal of user have been improved with itself incoherent noise signal.
In addition, for the frequency/amplitude to the above-mentioned signal that is obtained by the frequency/amplitude pick-up unit detects, will utilize detection method to the time zone of counter and height-low control (Peak-Bottom Hold) circuit etc.Simultaneously, said frequencies/amplitude detecting device carries out frequency shift with signal by FFT (Fast Fourier Transform Fourier transform).Then, utilize the frequency field detection method of the value that obtains amplitude and frequency again.
In addition, above-mentioned annular regulating device algorithm device is made of following components: promptly it is by the algorithm device that the loop gain of servo-drive system is regulated; The algorithm device that the shape of high frequency phase corrector is regulated.
In addition, can set the gauge of the value of each change by above-mentioned annular regulating device algorithm device.Then, if relevant value has reached the gauge that sets, judge that then system can not carry out normal regulatory function.Then, just can make the coefficient reduction of loop gain and phase corrector by the value of setting in advance.
Effect of the present invention:
As mentioned above, servosystem regulation device according to CD drive of the present invention, for the external error that high speed rotating produced according to the media CD of the most basic requirement when carrying out high power speed storage and reading, just the performance of servo-drive system can be maximized, thereby it can be followed the tracks of exactly to the target location.Simultaneously, can the loop shape of servo-drive system wave filter be changed in real time, can guarantee like this to become stable, thereby can guarantee the stability of total system by the labile factor of the caused servo-drive system of deviation of media CD and light picker etc.This is the good result that the present invention has.
In addition, the loop shape control method of the multiple deviation by dynamically reflecting system can be corresponding with the deviation of the characteristic that each system had, and when guaranteeing the stability of system, can make the performance maximization of servo-drive system.This is the another one good result that the present invention has.
In addition, with the corresponding situation of each regional characteristic of specific media CD under and make servo-drive system work.Therefore, for the All Ranges of the interior week/periphery of media CD, it can have stable memory property and can guarantee stability of stored.Simultaneously, even when data are read, also can guarantee to improve servo performance simultaneously.This is the another one good result that the present invention has.
In addition, for foundation loop shape control method of the present invention, it only uses the specific frequency signal of setting according to the wave filter that sets, and with its averaging.Therefore, it just can not be to being reacted by the external error of the caused servosignal of local damage of media CD.Consider this point, just the ruuning situation of annular regulating device regulated so that system can be to being made sensitive reaction by the local defect of CD, like this, system make a mistake operation can property very little just.This is the another one good result that the present invention has.
In addition, can be corresponding and carry out work in order to make system with the bias property of light picker, consider this point, when carrying out the making of CD, just on bigger degree, guaranteed to make the surplus of tolerance.Therefore, in the absorptivity when improving the light picker making, can also reduce the cost of manufacture of light picker, this just subsidiary favorable economic benefit that produced.This is the another one good result that the present invention has.
For further specifying above-mentioned purpose of the present invention, design feature and effect, the present invention is described in detail below with reference to accompanying drawing.
Description of drawings
Fig. 1 is the structural representation of expression according to the servosystem regulation device of CD drive of the present invention
Fig. 2 the 1st embodiment that to be expression show the detection components according to the frequency/amplitude of the servosystem regulation device of CD drive of the present invention.
Fig. 3 the 1st embodiment that to be expression show the detection components according to the frequency/amplitude of the servosystem regulation device of CD drive of the present invention.
Fig. 4 synoptic diagram that to be expression show the equivalence model according to the ring device of the servo-drive system of CD drive shown in Figure 1.
To be expression change and curve map that the characteristic of the sensitivity function of the variation of the servo performance characteristic that causes shows the loop shape according to the servo-drive system of CD drive shown in Figure 1 Fig. 5.
Fig. 6 is the curve map that the embodiment of the high frequency characteristics of expression servosignal that the increase according to the loop gain deviation is caused shows.
The symbol description of major part in the accompanying drawing:
10: light picker 20: focusing/tracking servo
30: annular regulating device 31: band filter
32: frequency/amplitude pick-up unit 33: annular regulating device algorithm device
Embodiment
Below, with reference to the accompanying drawings formation and effect according to the servosystem regulation device embodiment of CD drive of the present invention are described in detail.
Fig. 1 is the structural representation of expression according to the servosystem regulation device of CD drive of the present invention
With reference to Fig. 1 as can be seen, the servosystem regulation device according to the CD drive of embodiments of the invention has the feature that is made of following components: the optical Pickup device 10 that promptly optical disc medium is carried out laser radiation; To the focusing of above-mentioned light picker 10 with follow the tracks of focusing/tracking servo 20 that action is controlled; Utilize the rub-out signal of above-mentioned focusing/tracking servo 20 and the annular regulating device 30 that control signal is regulated servo-drive system in real time.
In addition, above-mentioned annular regulating device 30 has the feature that is made of following components: i.e. the band filter 31 that the centre frequency and the bandwidth of light picker 10 are set; To the frequency of the signal of filtering and the frequency/amplitude pick-up unit 31 that amplitude detects by above-mentioned band filter 31; The frequency and the amplitude of the signal by above-mentioned detection, and change condition, and the annular regulating device algorithm device 33 that servo-drive system is regulated according to the loop shape of having set.
For above-mentioned band filter 31, it has following feature: promptly it detects high-frequency signal.Here, the bandwidth of the centre frequency of band filter 31 and wave filter is that characteristic by the wave filter of designed servo-drive system is determined.Therefore, above-mentioned band filter 31 has the structure of the band filter that program can carry out.Above-mentioned high-frequency signal through detection is become through filtered bandwidth signal with through the AC signal after coupling.Like this, by this signal is carried out suitable mensuration, the frequency of bandwidth signal and average amplitude just can have been calculated.
In addition, can calculate the amplitude and the frequency of high-frequency signal by said frequencies/amplitude detecting device 32, then, the high-frequency signal that detects by said frequencies/amplitude detecting device 32 will show the trend that the media CD of sening as an envoy to is rotated repeatedly.Therefore, utilize, just can trigger the moment of input from the FG signal that spindle motor obtained.Then, just 0 of the high-frequency signal after this moment is intersected the moment as the detection moment, and in the specific time, the time is detected.Then, with the value equalization that is detected.Then, again to removing of being comprised in the signal, thereby just can the SN ratio of the desirable signal of user have been improved with itself incoherent noise signal.Fig. 2 to Fig. 3 is 1st embodiment and 2nd embodiment of expression according to the frequency/amplitude detection components of the regulating device of the servo-drive system of the CD drive of embodiments of the invention.In above-mentioned the 1st embodiment, for frequency/amplitude is detected, and the method that will utilize the time zone to counter and height-low control (Peak-Bottom Hold) modular circuit etc. to detect wherein also comprises: the reference clock of mean value module (Averaging Block), frequency detection module, frequency computation part.Or the same with the 2nd embodiment, utilize the frequency field detection method that frequency is changed the value of the amplitude that obtains and frequency by FFT (Fast Fourier Transform Fourier transform) module.
Then, the value of the frequency/amplitude of the high-frequency signal that will be obtained by said frequencies/amplitude detecting device 32 is as the parameter that loop shape is changed.Then, the loop shape of focusing/tracking servo 20 just can form by annular regulating device algorithm device 33.
Though annular regulating device algorithm device 33 can have multiple structure.But as the important elements of its shape of decision, it is to be made of algorithm device that the loop gain of focusing/tracking servo 20 is regulated and algorithm device that the shape of high frequency phase corrector is regulated.
But, under the situation of needs, only use loop gain adjusting algorithm device or high frequency phase corrector shape adjustment algorithm device also can regulate to the shape in loop.
For example: according to the characteristic in the servo-drive system of the 1st stage design, the target frequency that can be by high-frequency signal and the threshold value of amplitude and the shape in loop is regulated then, are set quiescent conditions again.
Then, in above-mentioned the 2nd stage, for more than the threshold value that shows amplitude the situation of characteristic of high-frequency signal, when the value according to frequency shows the big situation of current frequency ratio target frequency, reduce with regard to the gain to the loop by stages.On the contrary, if during the little situation of current frequency ratio target frequency, increase with regard to the gain to the loop by stages.In above-mentioned the 3rd stage, if the value of the amplitude of frequency signal below threshold value, then will make the action of above-mentioned increase or reduction stop.
In above-mentioned the 4th stage, increase by stages/reduce by making loop gain, the frequency of high-frequency signal will move with the direction that target frequency is close.But, under amplitude is not reduced to situation below the threshold value, then judge near the surplus of the phase place of the crossover frequency of servo-drive system, being guaranteed and insufficient.Then, according to above-mentioned judged result, the phase place correction characteristic of the phase corrector of servo-drive system is changed, so that its phase margin increases.Then, again loop shape is changed.Like this, when the value of the amplitude of high-frequency signal reaches threshold value when following, the change action of loop shape stopped.
On the other hand, in above-mentioned the 3rd stage or the 4th stage, when the condition that stops when the action that loop shape is changed can not satisfy, in this case, just judge the adjusting of loop shape moved and just can not normally carry out.Then, just the regulated value with loop shape is reduced to the state of setting in advance, after the report that run-time error occurs, just finishes to regulate action.In this case, just can not regulate the shape in loop again.
In this case, for loop gain change assembly and phase corrector coefficient change assembly, the gauge of its each change value is set.Then, if relevant value has reached the threshold value that sets, judge that then system can not carry out normal regulation operation.Then, just the coefficient of loop gain and phase corrector is reduced to the value of setting in advance.
In Fig. 4, shown structure situation according to the equivalence model in the servo-drive system loop of CD drive shown in Figure 1.The sensing device of light picker (Gh), light picker drive IC (Ga), and drive of optical picker (Gp) etc. shows deviation that servo-drive system the had form by the model error function of each superimposed type.In this case, when servo-drive system is carried out focusings/tracking and is moved, for just expressing by following formula with the performance that the dependent instruction of the output signal of the reference signal that should follow the tracks of is followed the tracks of.
[mathematical expression 1]
Here, r represents reference value, and its value is 0
In addition, to the relation of the output signal of external error, the removing performance and can express of promptly relevant output external error by [mathematical expression 2].
y(s)＝{1}over{1+(G{}p+DELTA?G{}p)(s)CD0T(G{}a+DELTA?G{}a)(s)CD0TG{}c(s)CD0T(G{}h+DELTAG{}h)(s)}CD0T?d(s)
Here, the transport function of relation for the output characteristics of the servo-drive system of output external error that is shown just is known as sensitivity function (sensitivity function).
Fig. 5 is expression according to the variation of the Performance Characteristics that is changed caused servo-drive system by the loop shape of servo-drive system shown in Figure 1 and curve map that sensitivity function is shown.As can be seen from the figure, along with the increase of loop gain or reduce, the reducing of the phase margin of guaranteeing by gain crossover frequency, the value that will cause sensitivity function reaches maximum frequency and amplitude and changes.
Here, this situation particularly can produce bigger influence for the system that surpasses loop gain.This situation will be with the unnecessary control entry approval of value with frequency higher than control bandwidth and the form of the rub-out signal that causes show.
Fig. 6 is the curve map that the embodiment of the high frequency characteristics of expression servosignal that the increase according to the loop gain deviation is caused shows.As can be seen from the figure, along with the increase of gain deviation, just can include high-frequency signal in the servosignal with peaked radio-frequency component.Under this relatively serious situation, sensitivity function will show with the form of servo loop vibration.
Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claims of the present invention variation, the modification of the above embodiment.
Claims (7)
1, a kind of servosystem regulation device of CD drive is to be used to carry out the CD drive that high power speed is stored/read, and it is characterized in that being made of following components:
The optical Pickup device of irradiating laser on optical disc medium;
To the focusing of above-mentioned optical Pickup device with follow the tracks of focusing/tracking servo device that action is controlled;
Utilize the rub-out signal of above-mentioned focusing/tracking servo and the annular regulating device that control signal is regulated servo-drive system in real time.
2, the servosystem regulation device of CD drive as claimed in claim 1 is characterized in that also comprising:
The band filter that the centre frequency and the band filter of described light picker signal are set;
To the centre frequency of the signal of filtering and the frequency/amplitude pick-up unit that amplitude detects by above-mentioned band filter;
Change condition and annular regulating device algorithm device that servo-drive system is regulated according to the frequency of the signal of above-mentioned detection and amplitude and according to the loop shape of having set.
3, the servosystem regulation device of CD drive as claimed in claim 2 is characterized in that:
Described frequency/amplitude pick-up unit is by from FG signal that spindle motor obtained and input is triggered constantly, then, 0 of high-frequency signal after this moment is intersected the moment as the detection moment, and in the specific time, the time is detected.Then, with the value equalization that is detected, then,, thereby just can the SN ratio of the desirable signal of user have been improved again to removing of being comprised in the signal with itself incoherent noise signal.
4, the servosystem regulation device of CD drive as claimed in claim 3 is characterized in that:
For the frequency/amplitude to the above-mentioned signal that is obtained by the frequency/amplitude pick-up unit detects, will utilize detection method to the time zone of counter and high one low control circuit.
5, the servosystem regulation device of CD drive as claimed in claim 3 is characterized in that:
For the frequency/amplitude to the above-mentioned signal that is obtained by the frequency/amplitude pick-up unit detects, said frequencies/amplitude detecting device carries out frequency shift with signal by Fourier transform (FFT), then, utilize the frequency field detection method of the value that obtains amplitude and frequency again.
6, the servosystem regulation device of CD drive as claimed in claim 2 is characterized in that:
Described annular regulating device algorithm device is made of following components: the algorithm device that the loop gain of servo-drive system is regulated; The algorithm device that the shape of high frequency phase corrector is regulated.
7, the servosystem regulation device of CD drive as claimed in claim 6 is characterized in that:
Can set the gauge of the value of each change by above-mentioned annular regulating device algorithm device, then, if relevant value has reached the gauge that sets, judge that then system can not carry out normal regulatory function, then, just can make the coefficient reduction of loop gain and phase corrector by the value of setting in advance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510029366 CN1925018A (en) | 2005-09-02 | 2005-09-02 | Servosystem regulation device for disc drive |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200510029366 CN1925018A (en) | 2005-09-02 | 2005-09-02 | Servosystem regulation device for disc drive |
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| CN1925018A true CN1925018A (en) | 2007-03-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101842841B (en) * | 2007-10-30 | 2012-12-12 | 株式会社日立制作所 | Disk device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101842841B (en) * | 2007-10-30 | 2012-12-12 | 株式会社日立制作所 | Disk device |
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