CN102402995A - Method and device for judging number of data layers of optical disk slice - Google Patents
Method and device for judging number of data layers of optical disk slice Download PDFInfo
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- CN102402995A CN102402995A CN2010102880116A CN201010288011A CN102402995A CN 102402995 A CN102402995 A CN 102402995A CN 2010102880116 A CN2010102880116 A CN 2010102880116A CN 201010288011 A CN201010288011 A CN 201010288011A CN 102402995 A CN102402995 A CN 102402995A
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Abstract
The invention provides a method and a device for judging the number of data layers of an optical disk slice. The method for judging the number of the data layers of the optical disk slice comprises the following steps of: firstly, controlling an objective lens in an optical read head to move towards the direction of the optical disk slice and recording an aggregation signal generated when executing the action; and detecting the number of wave crests of the aggregation signal and calculating the number of the data layers of the optical disk slice according to the number of the wave crests. The method and the device which are provided by the invention have the advantages that under the condition of unchanging an original framework of a CD (Compact Disc) driver, the number of the data layers of the optical disk slice can be effectively calculated by utilizing the aggregation signal. Even though the spherical aberration is changed due to factors of the variation of the environment, the aging of the optical read head, different played disks and the like, even the variation of using habits (vertical or horizontal playing), the correct number of the data layers of the optical disk slice can be judged. Therefore, the difficulty in regulating a backend servo signal is reduced and the read/write quality of a CD driver system is improved.
Description
Technical field
The present invention relates to a kind of judgement discs number of data layers purpose method and apparatus, and be particularly related to judgement Blu-ray Disc sheet number of data layers purpose method and apparatus.
Background technology
The tradition CD-ROM drive judges that the number of discs data Layer mainly is to utilize focus error signal to judge the number of disc data layer, please refer to Fig. 1, and it is the synoptic diagram that traditional CD-ROM drive is judged the DVD double-layer tablet.When CD-ROM drive detects the data Layer of discs; Utilize focus driving voltages (focus control output; FCO) object lens (object lens) of control optical read/write head rise and during near discs, can occur the less S type curve (s-curve) of amplitude earlier, and this is the top layer of disc.Afterwards, when two S type curves occurring as if focus error signal FE, then CD-ROM drive judges that this discs is a dual layer disc.Otherwise when detecting the data Layer of discs as if CD-ROM drive, if single S type curve only appears in focus error signal FE, then CD-ROM drive judges that said discs is the individual layer disc.Moreover, when detecting discs,, can produce single peak when therefore adding resultant signal SBAD, so be not suitable for being used for judging the data Layer number of discs through two data Layers because the depth of focus (focus depth) of DVD laser is longer.
Yet, utilize the S curve to judge that the situation of erroneous judgement just appears in discs number of data layers purpose method easily when the light storing technology gets into blue light.The reason that erroneous judgement why CD-ROM drive occurred is easily carefully stated as follows: in order to increase storage density, the optical system of CD-ROM drive is except traditional CD laser light and DVD laser light, and polygamy has been equipped with blue light (Blu-ray, BD) laser again.BD laser is compared to DVD laser; Its optical wavelength short (BD laser light wavelength X=405nm, DVD laser light wavelength X=650nm), but its numerical aperture (numerical aperture; NA) higher (numerical aperture of BD laser is 0.85, and the numerical aperture of DVD laser is 0.6).Please refer to Fig. 2, it is the optical coefficient of laser in the optical system and the correlation table of its correlation parameter.Hence one can see that, and less (λ/NA), therefore storage density can effectively increase the luminous point that reads of BD laser.Yet such design can make optical system responsive to the changes delta d of discs thickness.When the discs of read/write had variation in thickness Δ d, the effect that spherical aberration or title spherical aberration (spherical aberration) produce can be directly proportional with 4 powers of numerical aperture NA.So when optical system was used BD laser read/write discs, higher because of the numerical aperture of BD laser, the spherical aberration effect just clearly can't be left in the basket.
Please refer to Fig. 3, the actual focal error signal FE oscillogram when it reads blue light double-layer CD sheet for traditional CD-ROM drive.When detecting the blue light dual layer disc; Owing between each layer data layer difference in thickness is arranged, if do not have through spherical aberration compensation, its signal quality can decline to a great extent and cause focus error signal FE to dwindle distortion during the read/write data layer; Shown in dotted line among Fig. 3, S type curve is gross distortion.If the S type curve number of taking to calculate focus error signal FE appearance is used as number of data layers purpose basis for estimation, because of telling independently focus error signal FE by active zone, then the situation of Blu-ray Disc sheet erroneous judgement just takes place easily.Because the content of 3D film is in vogue now, following blue light dual layer disc or blue light multilayer disc must be popularized in a large number.If can't effectively judge the data Layer number of discs, just can cause the difficulty in rear end servosignal (servo signals) adjustment.Not only possibly drag and read the dish time slowly, even have the problem generation of reading the dish failure.Therefore, number how effectively to judge Blu-ray Disc sheet data Layer will be following technological emphasis.
Summary of the invention
To the problems referred to above; The object of the present invention is to provide a kind of judgement discs number of data layers purpose method; Can effectively improve having the situation that erroneous judgement takes place when utilizing focus error signal to judge Blu-ray Disc sheet data Layer number easily now, and then the read/write quality of raising CD-ROM system.
In addition; The present invention also aims to provide a kind of judgement discs number of data layers destination device; It can effectively improve the situation that has easy generation erroneous judgement when utilizing focus error signal to judge Blu-ray Disc sheet data Layer number now, and then the read/write quality of raising CD-ROM system.
The present invention proposes to judge in a kind of CD-ROM drive discs number of data layers purpose method, comprises the following steps: to move the object lens in the CD-ROM drive, produces a detection signal; Detect the crest number of this detection signal; And, calculate the number of discs data Layer according to the crest number of this detection signal.
Wherein, in a kind of embodiment of said method, this detection signal can be and adds resultant signal SBAD or radiofrequency signal RF.
The present invention also proposes a kind of judgement discs number of data layers destination device, and said device comprises: optical read head has object lens and photodetector; Control module connects optical read head, and its control object lens move, and receives an electric signal of photodetector generation and export a detection signal; Add resultant signal number counter, it calculates the crest number that this detection signal occurs; And ALU, it comes judgment data layer number according to adding resultant signal number counter result calculated.
Wherein, in a kind of embodiment of said apparatus, said detection signal is for adding resultant signal SBAD or radiofrequency signal RF.
In sum, the invention has the advantages that not change under the original framework of CD-ROM drive, utilize to add the data Layer number that resultant signal can effectively calculate discs.The difference that even if the variation of environment, optical read head be aging, play disc, even the change of use habit factors such as (upright or level are play) causes the change of spherical aberration, the present invention all can judge correct discs data Layer number.Also therefore reduce the difficulty in the servosignal adjustment of rear end, improve the read/write quality of CD-ROM system.
Above-mentioned explanation only is the general introduction of technical scheme of the present invention; Understand technological means of the present invention in order can more to know; And can implement according to the content of instructions, and for let above and other objects of the present invention, feature and advantage can be more obviously understandable, below special act embodiment; And conjunction with figs., specify as follows.
Description of drawings
Fig. 1 is the synoptic diagram that traditional CD-ROM drive is judged the DVD double-layer tablet.。
Fig. 2 is the correlation table of laser optics coefficient and its correlation parameter in the conventional optical systems.
Coherent signal oscillogram when Fig. 3 reads blue light double-layer CD sheet for traditional CD-ROM drive.
Fig. 4 is a CD-ROM system of the present invention.
Fig. 5 is the block diagram of digital signal processor internal circuit of the present invention.。
Fig. 6 a adds the inner circuit block diagram of resultant signal number counter.
Fig. 6 b is the coherent signal synoptic diagram that CD-ROM drive reads the single-layer optical disc sheet.
Fig. 6 c is the coherent signal synoptic diagram of CD-ROM drive when reading the double-layer CD sheet.
Fig. 7 judges discs number of data layers purpose method flow diagram for the present invention.
Fig. 8 judges the resulting coherent signal oscillogram of discs number of data layers purpose method for utilizing the present invention.
Fig. 9 is the judgement discs number of data layers purpose method flow diagram of second embodiment of the invention.
Description of reference numerals in the above-mentioned accompanying drawing is following:
100 discs, 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
510 arithmetic elements 520 add resultant signal number counter
530 ALUs, 540 control modules
550 storeies, 560 focus actuator
610 comparers, 620 impulse meters
Embodiment
Please refer to Fig. 4, its illustrate is CD-ROM system of the present invention.Optical read head 110 comprises blue laser light source 119, DVD LASER Light Source 113 and CD LASER Light Source 116, for the needs that read different discs.BD LASER Light Source 119, DVD LASER Light Source 113 or CD LASER Light Source 116 focus on the data Layer of discs 100 after through collimating mirror 112 and object lens 111; And the laser after the reflection can be incident upon on the photodetector 115; Convert light signal into electric signal; And this electric signal is through digital signal processor (the digital signal processor in the controller (controller) 120; DSP) 121 computings can obtain detection signal such as focus error signal FE and add resultant signal (sub beam adder signal, SBAD) or radiofrequency signal RF etc.BD LASER Light Source 119, DVD LASER Light Source 113 or CD LASER Light Source 116 are opened in controller 120 decisions wherein; Also can cooperate CD-ROM drive motor; Control focus actuator 560 (Fig. 5) moves to best focal point with object lens 111; And the spherical aberration compensation value is inserted in the spherical-aberration compensator (spherical aberration compensator) 114,, improved the read/write quality of CD-ROM system whereby with the optical aberration of compensating focusing luminous point on the discs 100.
Please refer to Fig. 5, it is the block diagram of digital signal processor 121 internal circuits of the present invention.At first; When CD-ROM drive reads discs 100; Control module 540 can control signal to focus actuator 560 and spherical-aberration compensator 114 according to judging that discs number of data layers purpose flow process is seen off, and this moment, photodetector 115 just produced ABCD signal to arithmetic element 510 according to the result who reads discs 100.Arithmetic element 510 computings produce a detection signal, and this moment, said detection signal was for adding resultant signal SBAD: (A+B+C+D).Then, add resultant signal number counter 520 and calculate the crest number that adds resultant signal SBAD, ALU 530 then basis adds resultant signal number counter result calculated and judges discs data Layer number.Be noted that, wherein arithmetic element 510, control module 540, ALU 530 with add resultant signal number counter 520 and all can in digital signal processor 121, realize with software mode.In addition, the technician in this field knows, adds resultant signal SBAD and all has identical characteristics of signals with radiofrequency signal RF.And adding resultant signal SBAD, said in this embodiment detection signal utilization explains that also can reach identical invention effect yet those skilled in the art utilizes radiofrequency signal RF to be used as said detection signal, the present invention will repeat no more.
According to embodiments of the invention,, can distinguish two peak values effectively when therefore adding resultant signal SBAD through two data Layers because the depth of focus of BD laser is very short.And set the data Layer number that a threshold voltage Vth promptly can be used to judge discs.
If below utilize the number that adds resultant signal SBAD calculating discs data Layer to make detailed description to the present invention: please refer to Fig. 6 a, it is the circuit block diagram that adds resultant signal number counter 520 inside.This adds resultant signal number counter 520 and comprises comparer 610 and impulse meter (pulse counter) 620.Comparer 610 has the output terminal of A and two input ends of B and C, and what wherein the A input end was coupled to arithmetic element 510 output adds resultant signal SBAD, and the B input end couples a predetermined threshold voltage Vth, and the C output terminal then is coupled to an impulse meter 620.And comparer 610 is if judge the voltage of the voltage of input end A greater than input end B, then output terminal C output noble potential.Otherwise if judge the voltage of the voltage of input end A less than input end B, then output terminal C exports electronegative potential as if comparer 610.Moreover the output terminal C that 620 of impulse meters can count comparator 610 has several pulses, reaches the purpose of calculating totalling signal wave crest number SBAD_cnt.
Please refer to Fig. 6 b and Fig. 6 c, it is respectively the coherent signal synoptic diagram of CD-ROM drive when reading the single-layer optical disc sheet and reading the double-layer CD sheet.When the disk read/write sheet,,, can produce a less crest shown in label 630 so add resultant signal SBAD when the inswept top layer of optical head because of optical head can just read data Layer L0 or data Layer L1 behind the top layer of elder generation's inswept (sweep) discs.And when optical head detects the data Layer L0 of discs, add resultant signal SBAD and then can produce a bigger crest shown in label 640.And add the number of resultant signal SBAD through calculating, and can know that Fig. 6 b is that optical head reads the signal that a single-layer optical disc sheet is produced, Fig. 6 c then reads the signal that a double-layer CD sheet is produced for optical head.
Be noted that the circuit block diagram of Fig. 6 a is a rough schematic, in fact also can realize the framework of this totalling event counter 520 in the mode of digital signal processor 121 usefulness logic determines.So CD-ROM drive can judge which floor data Layer is the discs that reads have through the number that calculating adds resultant signal.The present invention can be used for not only judging that the Blu-ray Disc sheet is double-layer tablet or single-layer sheet, also can be applicable to judge blue light BD multilayer tablet future.
Therefore, the crest number of utilizing calculating to add resultant signal SBAD can effectively be judged the number of discs data Layer.Please refer to Fig. 7, its illustrate is judged discs number of data layers purpose method flow diagram for the present invention.
Step 710: open the BD light source.
Step 720: move object lens, generation adds resultant signal SBAD and detects totalling signal wave crest number SBAD_cnt.
Step 730:, smaller or equal to 1, carry out step 750 as if totalling signal wave crest number SBAD_cnt according to the number that totalling signal wave crest number SBAD_cnt judges the discs data Layer; If not, then carry out step 740.
Step 740: the reward data number of layers equals totalling signal wave crest number SBAD_cnt and subtracts 1.
Step 750: repayment CD-ROM drive read error.
When the number of totalling signal wave crest number SBAD_cnt is less than or equals 1, represent not have on the discs to have any data Layer, so CD-ROM drive can be repaid (return) read error (step 730 and 750).Otherwise; When the number of totalling signal wave crest number SBAD_cnt greater than 1; Get rid of when reading the top layer and add the factor that resultant signal SBAD can produce a little crest, its data Layer number of the discs that is read just equals totalling signal wave crest number SBAD_cnt and subtracts 1 (step 730 and 740).
Please refer to Fig. 8, its illustrate is judged the resulting actual signal oscillogram of discs number of data layers purpose method for utilizing the present invention.Because the long-range reflectivity of crossing the top layer of the reflectivity of discs data Layer, so adding resultant signal SBAD peak value and can add resultant signal SBAD peak value during optical head reading of data layer much larger than what read the top layer.So, add resultant signal number counter and also can design a higher voltage threshold values Vth except the way of Fig. 8 embodiment.Thus, adding resultant signal number counter only can react to the resultant signal SBAD that adds of data Layer.At this moment add the data Layer number that totalling signal wave crest number SBAD_cnt that resultant signal number counter calculated promptly represents discs.
In addition, because of the factor that the actual amount production. art changes, the data Layer of discs and the thickness between the data Layer are excessive sometimes, cause sphere to differ the read/write function that effect has a strong impact on CD-ROM drive.Dwindle except focus error signal FE can be out of shape, also can influence the peak value that adds resultant signal SBAD sometimes, cause the signal that adds threshold voltage Vth that resultant signal number counter 520 sets and can't active zone tell data Layer.In the second embodiment of the present invention; When the discs that reads the above-mentioned type; Or the optical head that is equipped with of CD-ROM drive is to spherical aberration when responsive especially; System can be before calculating adds resultant signal SBAD number, executes voltage earlier and gives spherical-aberration compensator 114 and calculate and add resultant signal SBAD, in the hope of proper data number of layers.
Please refer to Fig. 9, it judges discs number of data layers purpose method flow diagram to its illustrate into second embodiment of the invention.
Step 910: adjustment spherical aberration compensation value is to predetermined value.
Step 920: open the BD light source.
Step 930: move object lens, generation adds resultant signal SBAD and detects totalling signal wave crest number SBAD_cnt.
Step 940:, smaller or equal to 1, carry out step 960 as if totalling signal wave crest number SBAD_cnt according to the number that totalling signal wave crest number SBAD_cnt judges the discs data Layer; If not, then carry out step 950.
Step 950: the reward data number of layers equals totalling signal wave crest number SBAD_cnt and subtracts 1.
Step 960: repayment CD-ROM drive read error.
Adjust spherical aberration compensation value to a predetermined value at first, earlier.The spherical aberration compensation value is the magnitude of voltage of control spherical-aberration compensator.Spherical-aberration compensator can be a liquid crystal structure, utilizes to change the ray refractive index that the voltage that stresses on liquid crystal structure changes spherical-aberration compensator, can reach the purpose of compensation spherical aberration.In the present embodiment, system is before calculating adds resultant signal SBAD number, and the spherical aberration compensation value of spherical-aberration compensator is adjusted to a predetermined value, calculates to add resultant signal SBAD, in the hope of proper data number of layers again.Said predetermined value is to be designed between reading two-layer data Layer (L0, its The optimal compensation value (SA0, intermediate value SA1) in the time of L1).This intermediate value is not necessarily middle value (SA0+SA1)/2, but tries to achieve according to the resultant signal SBAD amplitude experiment that adds at reading of data layer L0 and data Layer L1.The purpose of this step is when adjusting so far intermediate value when the spherical aberration compensation value; The adding resultant signal SBAD signal peak and can be similar to of two data Layers; But the threshold voltage Vth active zone that conveniently adds in the resultant signal number counter is told the crest number that adds resultant signal SBAD, and judges the data Layer number of discs whereby.
When totalling signal wave crest number SBAD_cnt is less than or equals 1, represent not have on the discs to have any data Layer, so CD-ROM drive can be repaid read error (step 940 and 960).Otherwise; When totalling signal wave crest number SBAD_cnt greater than 1; Get rid of when reading the top layer and add the factor that resultant signal SBAD can produce a little crest, its data Layer number of the discs that is read just equals totalling signal wave crest number SBAD_cnt and subtracts 1 (step 940 and 950).
So the present invention mainly utilizes the data Layer number that adds resultant signal SBAD or radiofrequency signal RF calculating discs.In the prior art, when utilizing the S type curve number of focus error signal FE to come the judgment data number of layers, the mechanism of must be earlier focus error signal FE being done some protections or amplification is in order to subsequent action.Yet arrived the blue light disk system, very responsive because of blu-ray system to spherical aberration, therefore must take more complicated protection mechanism could accurately judge the data Layer number of discs to focus error signal FE.Therefore the present invention utilizes the short depth of focus of blue laser and adds resultant signal SBAD or radiofrequency signal RF does not allow to be subject to the optical characteristics of spherical aberration influence, cooperates simple threshold value Vth to differentiate that calculation element can effectively estimate out the data Layer number of discs.Also therefore can save the circuit or the method for many protection focus error signal FE erroneous judgements, shorten judgement time.
Therefore, the invention has the advantages that not change under the original framework of CD-ROM drive, utilize to add the data Layer number that resultant signal SBAD can effectively calculate discs.The difference that even if the variation of environment, optical read head be aging, play disc, even the change of use habit factors such as (upright or level are play) causes the change of spherical aberration, the present invention all can judge correct discs data Layer number.Also therefore reduce the difficulty in the servosignal adjustment of rear end, improve the read/write quality of CD-ROM system.
The above only is embodiments of the invention, is not the present invention is done any pro forma restriction; Though the present invention discloses as above with embodiment; Yet be not that any those of ordinary skills are not in breaking away from technical scheme scope of the present invention in order to qualification the present invention; When the technology contents of above-mentioned announcement capable of using is made a little change or is modified to the equivalent embodiment of equivalent variations; In every case be not break away from technical scheme content of the present invention, to any simple modification, equivalent variations and modification that above embodiment did, all still belong in the scope of technical scheme of the present invention according to technical spirit of the present invention.
Claims (12)
1. judge discs number of data layers purpose method in a CD-ROM drive, comprise the following steps:
Move object lens in the said CD-ROM drive, produce a detection signal;
Detect the crest number of said detection signal; And
According to the crest number of said detection signal, calculate the number of said discs data Layer.
2. method according to claim 1 is characterized in that: the crest number that detects said detection signal comprises an amplitude the calculating said detection signal crest number greater than a threshold voltage.
3. method according to claim 2 is characterized in that: if the crest number of said detection signal is less than or equal to 1, then repay the CD-ROM drive read error; If the crest number of said detection signal is greater than 1, the number of then said discs data Layer is that the crest number of said detection signal subtracts 1.
4. method according to claim 2 is characterized in that: when said threshold voltage reads the detection signal amplitude on discs top layer greater than CD-ROM drive, the number of said discs data Layer is the crest number of said detection signal.
5. method according to claim 1 is characterized in that: said method also comprises step:
Adjust spherical aberration compensation value to a predetermined value of a spherical-aberration compensator in the said CD-ROM drive; Said predetermined value is to try to achieve with experiment according to the detection signal amplitude of CD-ROM drive reading of data layer L0 and data Layer L1, is the intermediate value of its best spherical aberration compensation value when CD-ROM drive reads double-deck data Layer L0, L1.
6. method according to claim 1 is characterized in that: said detection signal is for adding resultant signal or radiofrequency signal.
7. judge discs number of data layers destination device for one kind, comprising:
Optical read head has object lens and a photodetector;
Control module connects said optical read head, and it is controlled said object lens and moves, and receives the electric signal of said photodetector generation and export a detection signal;
Add resultant signal number counter, it calculates the crest number that said detection signal occurs; And
ALU, it comes judgment data layer number according to the said resultant signal number counter result calculated that adds.
8. device according to claim 7; It is characterized in that: the said resultant signal number counter that adds also comprises a comparer and an impulse meter; The crest amplitude of the more said detection signal of said comparer and a threshold voltage are also exported comparative result to said impulse meter, make said impulse meter export the number that said detection signal crest amplitude surpasses said threshold voltage.
9. device according to claim 8 is characterized in that: if the crest number of said detection signal is less than or equal to 1, and then said ALU repayment CD-ROM drive read error; If the crest number of said detection signal is greater than 1, the number of said discs data Layer is that the crest number of said detection signal subtracts 1.
10. device according to claim 8 is characterized in that: when said threshold voltage read the detection signal amplitude on discs top layer greater than CD-ROM drive, the number of discs data Layer was the crest number of said detection signal.
11. device according to claim 7; It is characterized in that: said device also comprises a spherical-aberration compensator; In order to adjust spherical aberration compensation value to a predetermined value of said spherical-aberration compensator; Said predetermined value is to try to achieve with experiment according to the detection signal amplitude of CD-ROM drive reading of data layer L0 and data Layer L1, is the intermediate value of its best spherical aberration compensation value when CD-ROM drive reads double-deck data Layer L0, L1.
12. device according to claim 7 is characterized in that: said detection signal is for adding resultant signal or radiofrequency signal.
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| CN2010102880116A CN102402995A (en) | 2010-09-17 | 2010-09-17 | Method and device for judging number of data layers of optical disk slice |
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| CN101359486A (en) * | 2007-07-30 | 2009-02-04 | 联发科技股份有限公司 | Data access method and optical data access apparatus thereof |
| CN101661764A (en) * | 2009-09-14 | 2010-03-03 | 凌阳科技股份有限公司 | Distinguishing method and distinguishing device of optical discs |
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| CN101154415A (en) * | 2006-09-28 | 2008-04-02 | 索尼日电光领有限公司 | Optical recording medium drive apparatus and method of determining the number of layers |
| CN101345063A (en) * | 2007-07-13 | 2009-01-14 | 凌阳科技股份有限公司 | Device and method for distinguishing kinds of optical disk |
| CN101359486A (en) * | 2007-07-30 | 2009-02-04 | 联发科技股份有限公司 | Data access method and optical data access apparatus thereof |
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Application publication date: 20120404 |