CN102201247B - Method and device for identifying warping of compact disc - Google Patents
Method and device for identifying warping of compact disc Download PDFInfo
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- CN102201247B CN102201247B CN201010131442.1A CN201010131442A CN102201247B CN 102201247 B CN102201247 B CN 102201247B CN 201010131442 A CN201010131442 A CN 201010131442A CN 102201247 B CN102201247 B CN 102201247B
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- 238000000034 method Methods 0.000 title claims abstract description 56
- 230000003287 optical effect Effects 0.000 claims description 95
- 239000010410 layer Substances 0.000 claims description 14
- 239000002356 single layer Substances 0.000 claims description 13
- 230000015572 biosynthetic process Effects 0.000 claims description 9
- 238000010586 diagram Methods 0.000 description 8
- 238000001514 detection method Methods 0.000 description 7
- 201000009310 astigmatism Diseases 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
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Abstract
The invention relates to a method for identifying the warping of a compact disc. The method comprises the following steps of: controlling an object lens to move from a first extreme position to a second extreme position and emit light beams to a compact disc; detecting the light beams reflected by the compact disc and generating first focus error signals; calculating the number of first S curves formed by the first focus error signals; identifying a type of the compact disc; selecting a corresponding first preset number according to the type of the compact disc; judging whether the number of the first S curves is larger than the first preset number or not; and judging that the compact disc is warped if the number of the first S curves is larger than the first preset number. In addition, the invention further provides a device for identifying the warping of the compact disc.
Description
Technical field
The present invention relates to a kind of method of defect recognition CD, particularly relate to and be a kind ofly used in disk player the method and device that identify warpage CD.
Background technology
CD because foozle, make moist, Exposure to Sunlight or the factor such as under pressure, its profile generation buckling deformation may be caused, as formed dip plane.As shown in Figure 1, CD 21 is warpage CD, CD 21 is placed on the rotating disk of Spindle Motor 11 of disk player, when Spindle Motor 11 drives CD 21 to rotate, the face of CD 21 is not parallel with the card of rotating disk, and there is certain degree of tilt, CD 21 meeting axially upper and lower beat, thus very large noise and vibration can be produced.In addition, CD 21 also can shorten the serviceable life of the servo control mechanism (not shown) of Spindle Motor 11 and disk player due to warpage, and affects stability when CD 21 is read and write, and is unfavorable for reading and the write of CD 21 data.
Summary of the invention
In view of this, be necessary to provide a kind of warpage optical disc discriminating method in fact.
In addition, there is a need to provide a kind of warpage optical disk identification device.
A kind of warpage optical disk identification device is for identifying CD whether warpage.Described warpage optical disk identification device comprises optical read head, bogey, optical disc types recognition device and focus servo.Described bogey is for placing described CD and driving described CD to rotate with predetermined speed.Described optical disc types recognition device is for identifying the type of described CD.Described optical read head is relative with the data surface of the CD being positioned over bogey, described optical read head comprises light source, photodetector and object lens, described light source is for generation of light beam and converge on described CD by described object lens, and described photodetector is for detecting the light beam that reflects from CD and producing electric signal.Described focus servo comprises focus error signal generator, focus driver, S curve recognizer, focus controller, judgment means and counter.Described focus error signal generator is used for generating focus error signal according to described electric signal.Described focus controller drives described object lens to move at the first extreme position and the second extreme position for controlling described focus driver.Described S curve recognizer for identify described object lens from the first extreme position to the second extreme position moving process produce focus signal formed the first S curve.Described counter is used for counting the number of the first S curve.Described judgment means selects corresponding first to preset S curve number according to the classification of described CD, and described first S curve number and the first number presetting S curve are compared, and preset S curve number when described first S curve number is greater than first, judge that described CD is warpage CD.
A kind of warpage optical disc discriminating method is for identifying CD whether warpage, described optical disc discriminating method uses optical read head and bogey, described bogey is used for placing compact disc and drives described CD to rotate with predetermined speed, described optical read head is relative with the data surface of the CD on described bogey, described optical read head comprise can send light beam light source, by beams converge to the object lens on CD and the detecting device that can detect the light beam reflected from CD.Described optical disc discriminating method comprises the steps:
Described CD is positioned on bogey, and drives described CD to rotate with predetermined speed;
Control object lens first extreme position to move to the second extreme position, send light beam to described CD simultaneously;
Detect the light beam fired back from described CD, and according to generation first focus error signal of light beam being detected;
Calculate the number of the first S curve that the first focus error signal that the first extreme position produces in the second extreme position moving process is formed;
Judge the type of described CD;
According to described optical disc types, select the number of the first corresponding default S curve;
Judge whether the number of the first S curve is greater than the number that first presets S curve;
If the number of the first S curve is greater than the number that first presets S curve, then judge described disc tilt.
The focus error signal that above-mentioned warpage optical disc discriminating method and device produce at the first extreme position and the second extreme position moving process according to object lens the number of S curve that formed can judge CD whether warpage.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of warpage CD when High Rotation Speed state.
Fig. 2 is the functional block diagram of the warpage optical disk identification device of a better embodiment.
The schematic diagram of the subregion schematic diagram that Fig. 3 is photodetector one better embodiment in the optical disk identification device of warpage shown in Fig. 2 and the image that the light signal that optical detection device detects is formed.
The focus error signal S-curve schematic diagram that Fig. 4 produces for the light signal detected according to optical detection device.
Fig. 5 is the warpage optical disc discriminating method process flow diagram of the first better embodiment.
Main element symbol description
Warpage optical disk identification device 100
Bogey 10
CD 20
Optical read head 30
Focus servo 40
S curve recognizer 50
First counter 60
Second counter 70
Judgment means 80
Optical disc types recognition device 90
System controller 11
Photodetector 32
Object lens 34
Light source 36
Focus error signal generator 42
Focus driver 44
Controller 46
Step 401 ~ 429 of warpage optical disc discriminating method
Embodiment
The invention provides a kind of warpage optical disc discriminating method and device, can be applicable in disk player, identify whether CD is warpage CD, vibrate to suppress CD with the rotating speed that suitably can reduce the Spindle Motor of disk player when using warpage CD, thus guarantee the stability of disk player writable disc.Being appreciated that disk player can be DVD disk player, also can be blue light (Blu-ray) disk player.
Please refer to Fig. 2, it is the functional block diagram of the warpage optical disk identification device 100 of a better embodiment.Warpage optical disk identification device 100 is for identifying whether CD 20 is warpage CD.Warpage optical disk identification device 100 comprises bogey 10, optical read head 30, focus servo 40, S curve recognizer 50, first counter 60, second counter 70, judgment means 80, optical disc types recognition device 90 and system controller 11.
Bogey 10 is for placing compact disc 20 and drive CD 20 to rotate with set rate.In the present embodiment, bogey 10 is Spindle Motor.
Optical read head 30 is relative with the data surface of CD 20.Optical read head 30 is electrically connected at focus servo 40 and controls by focus servo 40.Optical read head 30 comprises light source 36, photodetector 32 and object lens 34.Light source 36 can be laser diode, and it is for sending light beam (not shown).This light beam focuses on CD 20 via object lens 34.Light signal for detecting the light beam reflected from CD 20, and is converted to electric signal by opto-electronic conversion by photodetector 32.In the present embodiment, photodetector 32 carries out adopting method of astigmatism in signal detection process.Please refer to Fig. 3, photodetector 32 is provided with light area A, B, C, D that 4 are detected light beam.Detection signal from each light area A, B, C, D can be converted to corresponding electric signal by photodetector 32.When correctly focussed, the rounded hot spot of image (as Fig. 3 b) of photodetector 32 is projected in; When optical read head 30 from CD 20 too close to time, the image of photodetector 32 be horizontal oval hot spot (as Fig. 3 a); When optical read head 30 from CD 20 too away from time, the image of photodetector 32 is straight oval hot spot (as Fig. 3 c).In other embodiments, photodetector 32 carries out adopting cutter lot or luck by which people are brought together (KnifeEdge), right spot method (Spot Size) and critical angle method (Critical Angle) etc. in signal detection process, these methods are all conventional detection method, are no longer described at this.
Focus servo 40 is subject to the control of system controller 11, for generation of focus error signal.Focus servo 40 comprises focus error signal generator 42, focus driver 44 and focus controller 46.Focus controller 46 moves up and down along the direction perpendicular to CD 20 to drive object lens 34 for controlling focus driver 44, make object lens 34 near or away from CD 20.Wherein, object lens 34 are defined as minimum extreme position with the position of CD 20 maximum distance apart.The position of the distance that object lens 34 are minimum with CD 20 is the highest extreme position.
In the present embodiment, the movement that above-mentioned focus controller 46 controls object lens 34 comprises 3 stages, the first stage successively: when CD 20 is positioned over Spindle Motor 10, controls object lens 34 and moves down, namely move to the direction away from CD 20, until object lens 34 move to minimum extreme position; Subordinate phase: when object lens 34 move to the minimum extreme position away from CD 20, controls object lens 34 and moves up, namely move to CD 20, until object lens 34 move to the highest extreme position near CD 20; Three phases: when object lens 34 move to the highest extreme position time, control object lens 34 and move down, namely move to the direction away from CD 20, until object lens 34 move to minimum extreme position again.
Focus error signal generator 42 is electrically connected to photodetector 32, for receiving the electric signal that photodetector 32 produces, and utilizing the operational formula of (A+C)-(B+D), producing corresponding focus error signal.Such as, when correctly focussed, (A+C)-(B+D)=0, namely focus error signal is 0; When optical read head 30 from CD 20 too close to time, (A+C)-(B+D) < 0, namely focus error signal is less than 0; When optical read head 30 from CD 20 too away from time, (A+C)-(B+D) > 0, namely focus error signal is greater than 0.As shown in Figure 4, focus error signal and object lens 34 displacement relation curve are the curve of similar S shape, are called S curve (S-Curve).The focus error signal adopting other detection modes to produce equally also forms S curve.
S curve recognizer 50 is electrically connected to photodetector 32, it is for the focus error signal in described subordinate phase and described phase III collectiong focusing error signal generator 42 generation, and according to described focus error signal, judge whether described focus error signal forms S curve.
First counter 60 is for described subordinate phase, that is object lens 34 move to from minimum extreme position the first S curve produced the highest extreme position process and count.
Second counter 70 is for the described phase III, that is object lens 34 move to from the highest extreme position the second S curve produced minimum extreme position process and count.
Optical disc types recognition device 90 controls, for identifying the type of CD 20 by system controller 11.In the present embodiment, the type signal of CD 20 for identifying whether CD 20 is double-layer CD or single-layer optical disc, and is sent to judgment means 80 by optical disc types recognition device 90.Disc type recognition method is method conventional in disk player, does not repeat them here.
Judgment means 80 responds the type signal, number for the S curve produced subordinate phase and phase III presets S curve number with corresponding first respectively and the second default S curve number is compared, and judges whether CD 20 is warpage CD according to comparative result.Such as, if the S curve number that subordinate phase and phase III produce all is greater than the first default S curve number and the second default S curve number, then judge that CD 20 is as warpage CD.Otherwise CD 20 is normal CD.Can draw through experiment, normal single-layer optical disc is 1 at the number of the S curve that subordinate phase and phase III produce.Normal double-layer CD is less than 5 at the number of the S curve that subordinate phase produces, and the S curve number produced in the phase III is 1.Therefore, in the present embodiment, single-layer optical disc is 1 at the first number presetting the default S curve with second that subordinate phase is corresponding with the phase III.Double-layer CD is 5 at the first number presetting S curve that subordinate phase is corresponding, and the second default S curve number corresponding in the phase III is 1.Such as, judgment means 80 is when optical disc types recognition device 90 judges CD 20 for single-layer optical disc, S curve number subordinate phase and phase III produced compares with the first S curve number 5 preset and the second S curve number 1 respectively, if the S curve number that subordinate phase and phase III produce is greater than 5 and 1 respectively, then judge that CD 20 is for warpage CD.
Please refer to Fig. 5, the warpage optical disc discriminating method process flow diagram of its first better embodiment.Warpage CD is recognition methods for identifying CD whether warpage, and it uses the elements such as the optical read head of disk player and bogey.Wherein, bogey is used for placing compact disc and drives it to rotate with set rate.Described bogey can be Spindle Motor.Optical read head comprise can send light beam light source, by beams converge to the object lens on CD and the detecting device that can detect the light beam reflected from CD.Described warpage optical disc discriminating method comprises step below.
Step 401, is arranged at CD on Spindle Motor, and drives CD to rotate with predetermined speed.
Step 403, controls object lens and moves down, object lens are moved to the position away from CD.
Step 405, judges whether object lens move to minimum extreme position, and described minimum extreme position is the position of object lens and CD distance maximum.
Step 407, if object lens move to minimum extreme position, controls object lens and moves up, object lens are moved to the highest extreme position, send light beam simultaneously to CD.The highest described extreme position is object lens and the CD position apart from minimum place.
Step 409, detects the light beam fired back from CD, and according to generation first focus error signal of light beam being detected.
Step 411, calculates the number N of the first S curve that the first focus error signal is formed.
Step 413, judges whether object lens move to the highest extreme position.
Step 415, if object lens move to the highest extreme position, identifies the type of CD.Namely identify whether this CD is double-layer CD or single-layer optical disc.
Step 417, according to optical disc types, selects the number of the first corresponding default S curve.Described first number presetting S curve is that the S curve number that the normal CD corresponding according to optical disc types moves to from minimum extreme position the focus error signal formation that the highest extreme position produces at object lens is determined.Such as, CD is single-layer optical disc, and the first number presetting S curve is then that normal single layer CD moves to the S curve number of the focus error signal formation that the highest extreme position produces at object lens from minimum extreme position.In like manner, if CD is double-layer CD, the first number presetting S curve is then that normal double-layer CD moves to the S curve number of the focus error signal formation that the highest extreme position produces at object lens from minimum extreme position.In the present embodiment, the number of the first default S curve that single-layer optical disc is corresponding is 1, and the first default S curve number that double-layer CD is corresponding is 5.
Step 419, judges whether the number N of the first S curve is greater than the number that first presets S curve.If the number N of the first S curve is not more than the number that first presets S curve, perform step 421.If the number of the first S curve is greater than the number that first presets S curve, then perform step 433.
Step 421, controls object lens and moves down.
Step 423, detects the light beam of returning from CD reflection, and produces the second focus error signal according to the light beam detected.
Step 425, calculates the number of the second S curve that the second focus error signal is formed.Described second number presetting S curve is that the S curve number that the normal CD corresponding according to optical disc types moves to from the highest extreme position the focus error signal formation that minimum extreme position produces at object lens is determined.Such as, CD is single-layer optical disc and double-layer CD, and the number of the second pre-programmed curve is all 1.
Step 427, judges whether object lens move to minimum extreme position.
Step 429, if object lens move to minimum pole extreme position, according to the second default S curve number that optical disc types selects CD corresponding.If object lens move do not move to minimum pole extreme position, perform step 423.Described second number presetting S curve is that the S curve number that the normal CD corresponding according to optical disc types moves to from minimum extreme position the focus error signal formation that the highest extreme position produces at object lens is determined.That is, CD is single-layer optical disc, and the second number presetting S curve is then that normal single layer CD moves to the S curve number of the focus error signal formation that minimum extreme position produces at object lens from the highest extreme position.CD is double-layer CD, and the second number presetting S curve is then that normal double-layer CD moves to the S curve number of the focus error signal formation that minimum extreme position produces at object lens from the highest extreme position.In the present embodiment, single-layer optical disc and double-layer CD corresponding second preset S curve number be all 1.
Step 431, judges whether the number of the second S curve is greater than the number that second presets S curve.If the number of the second S curve is greater than the number that second presets S curve, perform step 431.
Step 433, judges that CD is warpage CD.
Above-mentioned warpage optical disc discriminating method and device move to from minimum extreme position the number producing focusing error S curve the highest extreme position process by first objective lens, and then objective lens moves to the process of minimum extreme position from the highest extreme position and produces focusing error S curve.In other embodiments, warpage optical disc discriminating method and device move to from the highest extreme position the number producing focusing error S curve minimum extreme position process by first objective lens, and then objective lens moves to from minimum extreme position the number producing focusing error S curve the process of the highest extreme position.
Above-mentioned warpage optical disc discriminating method and device are according in the process of object lens movement between the first extreme position and the second extreme position, that is object lens are from the highest extreme position and minimum extreme position, or the number of the S curve that the focus error signal that object lens produce from minimum extreme position to the moving process of the highest extreme position is formed is to identify CD whether warpage, thus in warpage CD read and write, the speed of conservative control optical disk rotary, reduce the negative effect that warpage CD brings, as, noise, vibration and read-write are unstable.
Claims (10)
1. a warpage optical disk identification device, for identifying CD whether warpage, described warpage optical disk identification device comprises optical read head, bogey, optical disc types recognition device and focus servo, and described bogey is for placing described CD and driving described CD to rotate with predetermined speed; Described optical disc types recognition device is for identifying the type of described CD; Described optical read head is relative with the data surface of the CD being positioned over bogey, described optical read head comprises light source, photodetector and object lens, described light source is for generation of light beam and focus on described CD by described object lens, and described photodetector is for detecting the light beam that reflects from CD and producing electric signal; Described focus servo comprises focus error signal generator and focus driver, described focus error signal generator is used for generating focus error signal according to described electric signal, described focus driver moves up and down along the direction of vertical CD for driving described object lens, it is characterized in that: described focus servo also comprises S curve recognizer, focus controller, judgment means and counter, described focus controller moves to drive described object lens for controlling described focus driver between the first extreme position and the second extreme position; Described S curve recognizer for identify described object lens from the first extreme position to the second extreme position moving process produce focus signal formed the first S curve; Described counter is used for counting the number of the first S curve; Described judgment means selects corresponding first to preset S curve number according to the classification of described CD, and described first S curve number and the first number presetting S curve are compared, and when the number of described first S curve number is greater than the first default S curve number, judge that described CD is warpage CD, the described first number presetting S curve is that the S curve number that the normal CD corresponding according to optical disc types moves to from minimum extreme position the focus error signal formation that the highest extreme position produces at object lens is determined.
2. warpage optical disk identification device as claimed in claim 1, when described S curve recognizer is also for judging that in described judgment means the number of described first S curve is not more than the number of the first default S curve, to identify described object lens are from the second extreme position to the process of the first extreme position movement produce the second S curve that focus signal formed, described counter is also for counting the number of described second S curve, described judgment means is also for selecting the number of the corresponding second default S curve according to described optical disc types, and the number of described second S curve and the second number presetting S curve are compared, if the number of described second S curve is greater than the number that described second presets S curve, judge that described CD is warpage CD.
3. warpage optical disk identification device as claimed in claim 2, is characterized in that: the S curve number that the number that the described first number and described second presetting S curve presets S curve produces respectively from the first extreme position to the process of the second extreme position movement with from the second extreme position at described object lens according to the corresponding normal CD of the type of described CD respectively to the process of described first extreme position movement is arranged.
4. warpage optical disk identification device as claimed in claim 1, is characterized in that: described first extreme position is described object lens and the position of described CD apart from maximum, and described second extreme position is described object lens and the described CD position apart from minimum place.
5. warpage optical disk identification device as claimed in claim 1, is characterized in that: described optical disc types recognition device is for identifying whether described CD is single-layer optical disc or double-layer CD.
6. a warpage optical disc discriminating method, for identifying CD whether warpage, described optical disc discriminating method uses optical read head and bogey, described bogey is for placing described CD and driving CD to rotate with predetermined speed, described optical read head is relative with the data surface of the CD on described bogey, described optical read head comprise can send light beam light source, focus of the light beam into the object lens on CD and the detecting device for detecting the light beam reflected from CD, it is characterized in that: described optical disc discriminating method comprises the steps:
Described CD is positioned on bogey, and drives described CD to rotate with set rate;
Control described object lens to move to the second extreme position from the first extreme position, send light beam to described CD simultaneously;
Detect the light beam fired back from described CD, and according to generation first focus error signal of light beam being detected;
Calculate the number of the first S curve that object lens are formed from the first focus error signal that the first extreme position produces to the second extreme position moving process;
Identify the type of described CD;
According to described optical disc types, select the number of the first corresponding default S curve, the described first number presetting S curve is that the S curve number that the normal CD corresponding according to optical disc types moves to from minimum extreme position the focus error signal formation that the highest extreme position produces at object lens is determined;
Judge whether the number of the first S curve is greater than the number that first presets S curve;
If the number of the first S curve is greater than the number that first presets S curve, then judge described disc tilt.
7. warpage optical disc discriminating method as claimed in claim 6, is characterized in that: described warpage optical disc discriminating method also comprises the steps:
If if the number of the described first pre-first S curve is not more than the number that first presets S curve, controls object lens and move to the first extreme position from the second extreme position, and detect the light beam of returning from CD reflection;
The second focus error signal is produced according to the light beam detected;
Calculate the number of the second S curve that object lens are formed from the second focus error signal that the second extreme position produces to the first extreme position moving process;
According to the second default S curve number that described optical disc types selects CD corresponding;
Judge whether the number of the second S curve is greater than the number that second presets S curve;
If the number of the second S curve is greater than the number that described second presets S curve, then judge that described CD is warpage CD.
8. warpage optical disc discriminating method as claimed in claim 7, is characterized in that: the described first default S curve number and described second presets the S curve number setting that S curve number normal CD corresponding according to the type of described CD respectively produces in the first extreme position and the second extreme position moving process.
9. warpage optical disc discriminating method as claimed in claim 6, it is characterized in that: described first extreme position is the one in described object lens and the position of distance maximum of CD and both positions at the minimum place of distance of described object lens and described CD, described second extreme position is described another one in the two.
10. warpage optical disc discriminating method as claimed in claim 6, is characterized in that: identify that the step of the type of CD is for identifying whether described CD is individual layer or double-layer CD.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1851814A (en) * | 2006-05-10 | 2006-10-25 | 清华大学深圳研究生院 | Optical disk vertical deviation detecting method |
| CN101256797A (en) * | 2007-02-26 | 2008-09-03 | 联发科技股份有限公司 | Method for identifying optical disc |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1851814A (en) * | 2006-05-10 | 2006-10-25 | 清华大学深圳研究生院 | Optical disk vertical deviation detecting method |
| CN101256797A (en) * | 2007-02-26 | 2008-09-03 | 联发科技股份有限公司 | Method for identifying optical disc |
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