CN101038774A - Device and method for detecting fault CD disc - Google Patents
Device and method for detecting fault CD disc Download PDFInfo
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- CN101038774A CN101038774A CN 200710103963 CN200710103963A CN101038774A CN 101038774 A CN101038774 A CN 101038774A CN 200710103963 CN200710103963 CN 200710103963 CN 200710103963 A CN200710103963 A CN 200710103963A CN 101038774 A CN101038774 A CN 101038774A
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Abstract
The invention discloses a device and a method for detecting faults in an optical disk, the method comprises following step: determining data which is accessed on a track by an optical reading head under a track locked state; cutting an analog wave signal to be a digital wave clock signal; determining whether the track is a fault region according to the wave clock signal; and maintaining a position of the optical reading/writting head when the track is determined as a fault region, so as to detect deformation faults of the track in the optical disk, thereby preventing a driver from failed focusing or track-sliding.
Description
Technical field
The present invention relates to a kind of apparatus and method that detect fault CD disc, particularly utilize wave signal (Wobble Signal) to detect the apparatus and method of fault CD disc.
Background technology
Please refer to Fig. 1, it is the servo-control system synoptic diagram of a CD-ROM drive, wherein this CD-ROM drive (optical discdrive) mainly has an optical read/write head (optical pickup head, be called for short PUH) 10, and have a center hole (center hole) can be fixed on the rotating disc (turn table) 122 on the discs 110 and be subjected to the drive of a Spindle Motor (spindle motor) 120 and rotate.And optical read/write head 10 can produce the drive controlling power with so that optical read/write head 10 produces moving and the moving of focus direction radially via driver 180.
And produce ultra-weak electronic signal during the enterprising line access of 10 pairs of discs of optical read/write head 110, this electric signal is handled back exportable one group of servo error signal (servoerror signal) by pre-amplifier (pre-amplifier) 150, and for example a radiofrequency signal (Radio-Frequency signal, RF), inferior light add resultant signal (sub-beam added signal, SBAD), wave signal (wobble signal), tracking error signal (tracking error signal, TE) and focus error signal (Focusing error signal, FE) etc.Afterwards, this group servo error signal controller 170 (controller) of importing the rear end is again handled and is used.
According to this group servo error signal, controller 170 with regard to exportable one group of servo-control signal to driver 180.And this group servo-control signal comprises at least and follows rail control signal (tracking controlsignal) and a focus control signal (focusing control signal).In addition, at least comprise in the driver 180 and follow path circle (tracking coil) and focusing coil (focusing coil), input to and just can produce the radial drive control when following the path circle and carry out radially trickle mobile of discs in order to drive this optical read/write head 10 when following the rail control signal; And focus control signal just can produce focus direction drive controlling power when inputing to focusing coil and carries out moving of focus direction in order to drive optical read/write head 10.Therefore, under normal operation, radial drive control and focus direction drive controlling power can make optical read/write head 10 maintain suitable focal position and move along the track of discs.
Yet, because the scratch of the flaw of discs technology or discs all can cause the defective of discs.When in optical read/write head 10 is reading the process of discs, running into the defect area on the discs, the servo error signal of pre-amplifier 150 outputs can be undesired, therefore, controller 170 also can produce abnormal servo-control signal and cause driver 180 can't correctly control optical read/write head 10, makes the servo-control system of CD-ROM drive present unsettled situation.When servo-control system was unstable, optical read/write head 10 just may produce and focus on fail (focusing fail) or slide rail (off track), and and then caused the data of discs can't access or data access mistake.In addition, all comprise in the controller 170 of CD-ROM drive a Gain Automatic controller (auto gain controller, AGC), in order to the gain of dynamic adjustment wave signal.Yet when running into the defect area on the discs in optical read/write head 10 is reading the process of discs, Gain Automatic controller can constantly increase the yield value of wave signal because wave signal is too little, thereby causes the misoperation of CD-ROM drive.
In addition, U.S. Patent application discloses the definite method that discloses flaw block on a kind of discs for US2005/0265170 number in early days.This method relatively time light adds resultant signal (SBAD) and adds resultant signal (SBAD through the inferior light after the low-pass filter
Low_Pass), when the absolute value of two signal subtractions surpassed a critical value (threshold), this zone just was confirmed as defect area.Please refer to Fig. 2, it is the signal schematic representation that known CD-ROM drive detects disk defect.When optical read/write head emitted light beams during along discs track access data, when supposing bright defective (bright defect) to occur on the track, the too strong zone of reflectivity for example, inferior light add resultant signal (SBAD) can fast rise and add resultant signal (SBAD through the inferior light after the low-pass filter
Low_Pass) can slowly rise, when the absolute value of two signal subtractions surpasses the M value, the flaw indication of controller 170 (DEFECT) can produce one first level (for example high level), and when the absolute value of described two signal subtractions was lower than the M value, flaw indication (DEFECT) just can revert to one second level (for example low level).In like manner, when supposing on the track dark defective (dark defect) to occur, the zone of scratch for example, then time light adds resultant signal (SBAD) and can descend fast and add resultant signal (SBAD through the inferior light after the low-pass filter
Low_Pass) can slowly descend, when the absolute value of two signal subtractions surpasses the M value, the flaw indication of controller 170 (DEFECT) can produce one first level, and when the absolute value of described two signal subtractions was lower than the M value, flaw indication (DEFECT) just can revert to one second level.Make CD-ROM drive avoid producing focusing failure or slide rail and utilize this flaw indication, driver 180 can adjust drive controlling power in real time.
In addition, utilize radiofrequency signal (RF) also can determine flaw block on the discs.Please refer to Fig. 3, it is the signal schematic representation that known CD-ROM drive detects disk defect.This method is the radiofrequency signal (RF that judges through behind the high pass processor
High_Pass).When optical read/write head emitted light beams during along discs track access data, when supposing that track is defect area, through the radiofrequency signal (RF behind the high pass processor
High_Pass) can descend suddenly, this moment, the flaw indication of controller 170 can produce first level (for example high level), and the radiofrequency signal (RF behind process high pass processor
High_Pass) recover just often that flaw indication just can revert to second level (for example low level).Make CD-ROM drive avoid producing focusing failure or slide rail and utilize this flaw indication, driver 180 can adjust drive controlling power in real time.
Above-mentioned defect area determines that method all is the defect area that the size of utilizing the energy of laser beam reflection to add up is determined discs.Yet, when track deformation defective appears in discs during fabrication, because the size that the energy of laser beam reflection adds up during CD-ROM drive access discs does not have obvious variation, can make CD-ROM drive can't detect track deformation defective and make CD-ROM drive to control, and may produce and focus on failure or slide rail and and then cause the data of discs can't access or data access mistake optical read/write head.
Summary of the invention
The objective of the invention is to propose a kind of apparatus and method that detect fault CD disc,, make CD-ROM drive avoid producing and focus on failure or slide rail in order to detect the track deformation defective on the discs.
The present invention proposes a kind of device that detects fault CD disc, and this device comprises: a Spindle Motor, in order to rotate a discs; One optical read/write head, but this discs of access and control this optical read/write head via one group of drive controlling power carry out one and move radially and a focus direction moves; One pre-amplifier is connected to this optical read/write head, and the electric signal that is produced when receiving this discs of this optical read-write head accessing also produces one group of servo error signal, and wherein this group servo error signal comprises a wave signal at least; One controller is connected to this pre-amplifier, in order to produce one group of servo-control signal according to this group servo error signal; One driver is connected to this controller, in order to produce this group drive controlling power according to this group servo-control signal; An and railroad flaws detecting device, be connected to this pre-amplifier, in order to receive this wave signal and to determine according to this wave signal whether the position of this optical read-write head accessing is a defect area, and when this railroad flaws detecting device detects this defect area, produce a railroad flaws signal to this controller, make this controller to keep this group servo-control signal or to keep a yield value of this wave signal according to this railroad flaws signal.
The device of detection fault CD disc of the present invention, wherein this group drive controlling power comprises a radial drive control and a focus direction drive controlling power.
The device of detection fault CD disc of the present invention, wherein this group servo error signal also comprises a radiofrequency signal, once light adds resultant signal, a tracking error signal and a focus error signal.
The device of detection fault CD disc of the present invention, wherein this group servo-control signal comprises and follows a rail control signal and a focus control signal.
The device of detection fault CD disc of the present invention, wherein when this controller was kept this group servo-control signal, it is constant that this driver can be kept this group drive controlling power.
The device of detection fault CD disc of the present invention, wherein this defect area is a track deformation defect area.
The device of detection fault CD disc of the present invention, when wherein this railroad flaws detecting device produced this railroad flaws signal, this controller can be kept a yield value of this wave signal.
The present invention also proposes a kind of method that detects fault CD disc, and this method comprises the following steps: to determine the data of an optical read head on a lock rail state access one track; One wave signal of cutting simulation becomes a wave clock signal of numeral; Determine according to this wave clock signal whether this track is a defect area; And when this track is defined as this defect area, keeps the invariant position of this optical read/write head or keep a yield value of this wave signal.
The method of detection fault CD disc of the present invention determines that wherein whether this track is that the step of this defect area also comprises: a plurality of pulse numbers that produced in this wave clock signal of very first time inside counting; And, judge that this track is this defect area when one first count value of described a plurality of pulse numbers during less than one first critical value, otherwise, judge that this track is not this defect area.
The method of detection fault CD disc of the present invention, also comprise: when this optical read head is positioned at this defect area, when this first count value during greater than one second critical value, judge that this optical read head has left this defect area, wherein this second critical value is more than or equal to this first critical value.
The method of detection fault CD disc of the present invention also comprises: when this optical read head is positioned at this defect area above one second time, judge that this optical read head has left this defect area.
The method of detection fault CD disc of the present invention determines that wherein whether this track is that the step of this defect area also comprises: a plurality of defective pulse width that is produced in this wave clock signal of one the 3rd time inside counting; And, judge that this track is this defect area when one second count value of described a plurality of defective pulse widths during greater than one the 3rd critical value, otherwise, judge that this track is not this defect area.
The method of detection fault CD disc of the present invention, also comprise: when this optical read head is positioned at this defect area, when this second count value during less than one the 4th critical value, judge that this optical read head has left this defect area, wherein the 3rd critical value is more than or equal to the 4th critical value.
The method of detection fault CD disc of the present invention also comprises: when this optical read head is positioned at this defect area above one the 4th time, judge that this optical read head has left this defect area.
The method of detection fault CD disc of the present invention wherein also comprises when this track determines to be positioned at this defect area, keeps a yield value of this wave signal.
Therefore, the present invention also proposes a kind of method that detects fault CD disc, comprises the following steps: to determine the data of an optical read head on a lock rail state access one track; Peak according to a wave signal of simulating determines to peak value whether this track is a defect area; And when this track is defined as this defect area, keeps the invariant position of this optical read/write head or keep a yield value of this wave signal.
The method of detection fault CD disc of the present invention determines wherein whether this track is that this defect area step also comprises: when this peak, is judged that this track be this defect area, otherwise judged that this track is not this defect area during less than one the 5th critical value peak value.
The method of detection fault CD disc of the present invention, also comprise: when this optical read head is positioned at this defect area, when this peak peak value during greater than one the 6th critical value, is judged that this optical read head has left this defect area, wherein the 6th critical value is more than or equal to the 5th critical value.
The method of detection fault CD disc of the present invention also comprises: when this optical read head is positioned at this defect area above one the 5th time, judge that this optical read head has left this defect area.
The method of detection fault CD disc of the present invention wherein also comprises when this track determines to be positioned at this defect area, keeps a yield value of this wave signal.
Description of drawings
In order further to understand feature of the present invention and technology contents, see also following about detailed description of the present invention and accompanying drawing, yet accompanying drawing only provide with reference to and explanation, be not to be used for the present invention is limited, wherein:
Fig. 1 is the servo-control system synoptic diagram of a CD-ROM drive.
Fig. 2 is the signal schematic representation that known CD-ROM drive detects disk defect.
Fig. 3 is the signal schematic representation that known CD-ROM drive detects disk defect.
Fig. 4 is the discs synoptic diagram with track deformation defective.
Fig. 5 is the servo-control system synoptic diagram of the present invention's one CD-ROM drive.
Fig. 6 is wave signal, wave clock signal, railroad flaws signal, follow the relation between rail control signal, focus control signal and the wave signal yield value.
Fig. 7 detects first embodiment of railroad flaws method for the present invention.
Fig. 8 detects second embodiment of railroad flaws method for the present invention.
Fig. 9 detects the 3rd embodiment of railroad flaws method for the present invention.
Wherein, description of reference numerals is as follows:
10 optical read/write heads
110 discs, 120 Spindle Motors
122 rotating discs, 150 pre-amplifiers
170 controllers, 180 drivers
190 discs, 195 track deformation defectives
510 optical read/write heads
515 discs, 520 Spindle Motors
522 rotating discs, 550 pre-amplifiers
555 railroad flaws detecting devices, 570 controllers
580 drivers
Embodiment
Please refer to Fig. 4, it is the discs synoptic diagram with track deformation defective.Ideally, the track of discs is spiral fashion (spiral) track from inside to outside, because the manufacturing flaw of discs can cause forming on the discs 190 track deformation defective 195.When the laser beam that optical read/write head sent is passed through this track deformation defective 195, inferior light adds resultant signal (SBAD) can not produce obvious variation with radiofrequency signal (RF), therefore, the controller of CD-ROM drive can't be by adding resultant signal (SBAD through the inferior light after the low-pass filter
Low_Pass) or through the radiofrequency signal (RF behind the high pass processor
High_Pass) detect this track deformation defective 195.
Therefore, the present invention proposes a kind of apparatus and method of utilizing wave signal to detect fault CD disc, in order to detect the track deformation defective on the discs.That is to say that the present invention determines that according to the variation of wave signal whether the position at optical read/write head place is the defect area on the discs.Please refer to Fig. 5, it is the servo-control system synoptic diagram of the present invention's one CD-ROM drive, and wherein this CD-ROM drive mainly has an optical read/write head 510, and has a center hole can be fixed on the rotating disc 522 on the discs 515 and be subjected to the drive of a Spindle Motor 520 and rotate.And optical read/write head 510 can produce the drive controlling power via driver 580, with so that optical read/write head 510 can produce moving and the moving of focus direction radially.
And produce ultra-weak electronic signal during the enterprising line access of 510 pairs of discs of optical read/write head 515, this electric signal is handled the exportable one group of servo error signal in back by pre-amplifier 550, and for example a radiofrequency signal (RF), inferior light add resultant signal (SBAD), wave signal, tracking error signal (TE) and focus error signal (FE) etc.Afterwards, this group servo error signal controller 570 of importing the rear end is again handled and is used.
According to this group servo error signal, controller 570 with regard to exportable one group of servo-control signal to driver 580.And this group servo-control signal comprises at least and follows a rail control signal and a focus control signal.In addition, comprise at least in the driver 580 and follow path circle and focusing coil, input to and just can produce the radial drive control when following the path circle, carry out discs trickle moving radially in order to drive this optical read/write head 510 when following the rail control signal; And focus control signal just can produce focus direction drive controlling power when inputing to focusing coil, carries out moving of focus direction in order to drive optical read/write head 510.Therefore, under normal operation, radial drive control and focus direction drive controlling power can make optical read/write head 510 maintain suitable focal position and move along the track of discs.
According to embodiments of the invention, in CD-ROM drive, add a railroad flaws detecting device 555, in order to receiving the wave signal that this pre-amplifier is exported, and determine according to wave signal whether the track of optical read/write head 510 accesses the track deformation defective occurs.When railroad flaws detecting device 555 detected the track deformation defective, this railroad flaws detecting device 555 can be exported a railroad flaws signal to controller 570.In addition, when controller 570 receives this railroad flaws signal, this controller 570 is no longer exported corresponding servo-control signal group to driver 580 according to this group servo error signal, but keep this group servo-control signal, make this group servo-control signal can not produce and focus on failure or slide rail, and then cause the data of discs can't access or data access mistake along with this group servo error signal of mistake.In addition, when controller 570 received this railroad flaws signal, the Gain Automatic controller of this controller 570 was adjusted the yield value of wave signal no longer automatically but is kept original yield value, made CD-ROM drive can not produce misoperation.
Please refer to Fig. 6, it is wave signal, wave clock (wobble clock) signal, railroad flaws signal, follow the relation between the yield value of rail control signal, focus control signal and wave signal.Because wave signal is a simulating signal, therefore utilize a datum that this wave signal is cut (slice), can obtain a wave clock signal of numeral.In addition, utilize this wave signal or this wave clock signal just can determine the defect area of discs according to embodiments of the invention.
As shown in Figure 6, locking rail (track on) when state carries out the access of orbital data when optical read/write head, the wave signal of pre-amplifier 550 outputs is the signal of chord wave type when reading on the rails; Otherwise when reading on the deformation track, pre-amplifier 550 can't be exported the signal of normal chord wave type.Therefore, railroad flaws detecting device 555 just can utilize track that wave signal or wave clock signal determine optical read-write head accessing this moment for defect area and produce the railroad flaws signal of one first level (for example high level), and the railroad flaws signal just can revert to one second level (for example low level) when wave signal reverts to the signal of chord wave type.In addition, when controller 570 receives the railroad flaws signal of this first level, it is constant that this controller 570 is kept this group servo-control signal, that is to say to keep to follow rail control signal and focus control signal, makes driver 280 keep the present focal position of optical read/write head and follow the rail position.When the railroad flaws signal reverted to second level, this controller 570 just can produce corresponding servo-control signal group according to this group servo error signal once more.
Please refer to Fig. 7, it detects first embodiment of railroad flaws method for the present invention.At first, determine the data of optical read head on lock rail state access track, then enable (enable) railroad flaws detecting device at S720 at S710.At this moment, S730 railroad flaws detecting device can cut (slice) simulation wave signal become the numeral a wave clock signal.Then, be that pulse (pulse) number that unit counts (count) this wave clock signal constantly becomes one first numerical value at S740 with a very first time.Then, the relation that compares first numerical value and first critical value at S750.When this first numerical value during greater than this first critical value, represent the position of optical read-write head accessing to there is no railroad flaws and take place, therefore, proceed S750 step relatively.When this first numerical value during less than this first critical value, represent the position of optical read-write head accessing to enter defect area, at this moment, export one first level (for example high level) at S760 railroad flaws detecting device.Then, carry out the step of railroad flaws region decision at S770.When the time of first level output surpassed one second time or first numerical value greater than one second critical value, this defect area was left in the position that can be considered optical read-write head accessing, therefore exports one second level (for example low level) at S780 railroad flaws detecting device.On the contrary, when the time of first level output did not also surpass one second time and first numerical value less than this second critical value, this defect area was not also left in the position that can be considered optical read-write head accessing, therefore gets back to determining step S770.
According to embodiments of the invention, utilizing the CD-ROM drive control chip is that unit counts the pulse wave number of this wave clock signal constantly and count value is upgraded constantly in the buffer of control chip with a very first time, that is to say, will upgrade up-to-date pulse wave number every this very first time buffer.Therefore, when the position of optical read-write head accessing is not during for defect area, the frequency of wave signal can maintain near the characteristic frequency, so the frequency of wave clock signal also can maintain near this characteristic frequency.Otherwise when the position of optical read-write head accessing was defect area, the frequency of wave signal can descend and can't maintain near this characteristic frequency, so the frequency of wave clock signal also can descend.Utilize above-mentioned characteristic, can judge that whether the position of optical read-write head accessing is positioned at defect area, that is to say, in the S750 step according to the pulse number of wave clock signal, when first numerical value during greater than first critical value, the position of promptly representing optical read-write head accessing is not a defect area.On the contrary, when first numerical value during less than first critical value, the position of promptly representing optical read-write head accessing is a defect area.In addition, in order to prevent the misoperation of defect detector, this second critical value that is to say greater than this first critical value, must determine can determine when first numerical value has arrived this second critical value that the position of this optical read-write head accessing left this defect area.
Please refer to Fig. 8, it detects second embodiment of railroad flaws method for the present invention.At first, determine the data of optical read head on lock rail state access track, then enable (enable) railroad flaws detecting device at S820 at S810.At this moment, the wave signal that can cut simulation at S830 railroad flaws detecting device becomes the wave clock signal of numeral.Then, be that the number that unit counts the defective pulse width in this wave clock signal constantly becomes a second value at S840 with one the 3rd time.Then, the relation that compares second value and the 3rd critical value at S850.When this second value during less than the 3rd critical value, represent the non-defect area in position of optical read-write head accessing, therefore, proceed S850 step relatively.When this second value during greater than the 3rd critical value, represent the position of optical read-write head accessing to enter defect area, at this moment, export one first level (for example high level) at S860 railroad flaws detecting device.Then, carry out the step of railroad flaws region decision at S870.When the time of first level output surpassed one the 4th time or second value less than one the 4th critical value, defect area was left in the position that can be considered optical read-write head accessing, therefore exports one second level (for example low level) at S880 railroad flaws detecting device.On the contrary, when the time of first level output did not also surpass one the 4th time and second value greater than the 4th critical value, defect area was not also left in the position that can be considered optical read-write head accessing, therefore gets back to determining step S870.
According to embodiments of the invention, utilizing the CD-ROM drive control chip is that unit counts in this wave clock signal defective pulse width number constantly and count value is upgraded constantly in the buffer of control chip with one the 3rd time, that is to say, will upgrade up-to-date defective pulse width number every the 3rd time buffer.Therefore, when the position of optical read-write head accessing there is no the railroad flaws generation, the frequency of wave signal and amplitude can maintain near a characteristic frequency and the particular amplitude, and therefore, the pulse width of the wave clock signal after the process cutting can maintain near the certain pulses width.Otherwise, when the position of optical read-write head accessing is the railroad flaws zone, the frequency of wave signal and amplitude can descend, therefore the pulse width of wave clock signal can not maintain near this certain pulses width, the pulse width of this moment may be too wide or too narrow, that is to say that the pulse of this class just is regarded as defective pulse width.Utilize above-mentioned characteristic, can determine whether the position of optical read-write head accessing is the railroad flaws zone, that is to say, in the S850 step according to the pulse number of defective pulse width, when second value during less than the 3rd critical value, the position of promptly representing optical read-write head accessing is not a defect area.On the contrary, when second value during greater than the 3rd critical value, the position of promptly representing optical read-write head accessing is a defect area.In addition, in order to prevent the misoperation of defect detector, the 3rd critical value that is to say greater than the 4th critical value, has left this defect area just must determine can determine when second value has been lower than the 4th critical value the position of this optical read-write head accessing.
Please refer to Fig. 9, it detects the 3rd embodiment of railroad flaws method for the present invention.At first, determine the data of optical read head on lock rail state access track, then enable (enable) railroad flaws detecting device at S920 at S910.At this moment, S930 railroad flaws detecting device sustainably a peak of measure analog wave signal to peak value (pick to pick value).When this peak to peak value during greater than one the 5th critical value, the position of representing optical read-write head accessing is not to be positioned at defect area, therefore, proceeds S940 step relatively.During less than the 5th critical value, represent the position of optical read-write head accessing to enter defect area to peak value when this peak, at this moment, export one first level (for example high level) at S950 railroad flaws detecting device.Then, carry out the step S960 of railroad flaws region decision.Surpass one the 5th time or this peak to peak value during greater than one the 6th critical value when the time of first level output, defect area is left in the position that can be considered optical read-write head accessing, therefore exports one second level (for example low level) at S970 railroad flaws detecting device.On the contrary, also surpass one the 5th time and this peak to peak value during less than the 6th critical value when the time of first level output, defect area is not also left in the position that can be considered optical read-write head accessing, therefore gets back to determining step S960.
According to embodiments of the invention, the peak that utilizes the CD-ROM drive control chip to detect wave signal upgrades in the buffer of control chip peak value constantly to peak value and with the peak.Therefore, when the position of optical read-write head accessing there is no the railroad flaws generation, the frequency of wave signal and amplitude can maintain near a characteristic frequency and the particular amplitude.Otherwise when the position of optical read-write head accessing was the railroad flaws zone, the frequency of wave signal and amplitude can descend.Utilize above-mentioned characteristic, can determine to peak value whether the position of optical read-write head accessing is defect area, that is to say, in the S940 step according to the peak of the wave signal of simulating, when the peak to peak value during greater than the 5th critical value, the position of promptly representing optical read-write head accessing is not a defect area.On the contrary, when the peak to peak value during less than the 5th critical value, the position of promptly representing optical read-write head accessing is a defect area.In addition, in order to prevent the misoperation of defect detector, the 6th critical value that is to say greater than the 5th critical value, has left this defect area just must determine can determine when the peak has arrived the 6th critical value to peak value the position of this optical read-write head accessing.
In addition, because that CD-ROM drive judges that mode that optical read head is in lock rail state has is a variety of, the present invention does not limit CD-ROM drive and which kind of method to determine that optical read head is in the rail state of locking according to.For instance, a lock rail signal (track on signal) is arranged in the CD-ROM drive control chip, most common form is exactly to determine according to lock rail signal whether optical read head is in lock rail state.Perhaps, this wave signal of simulation is deciphered in order to obtain the sync pattern (synchronous pattern) in this wave signal, when this wave signal can be deciphered out a plurality of sync pattern continuously, can be judged that also optical read head is in lock rail state.Perhaps, the frequency relation between the reference clock signal (reference clock) in comparison wave clock signal and the CD-ROM drive also can be used as and confirms optical read head is in lock rail state whether mode.
Therefore, the present invention determines according to wave signal whether the position at CD reading head place is positioned at defect area, make CD-ROM drive can detect track deformation defective and also in time optical read/write head is controlled, and can effectively solve the misoperation of CD-ROM drive and focus on failure or slide rail.
In sum; though the present invention is preferred embodiment openly; yet be not in order to limit the present invention; any people who is familiar with this technology; without departing from the spirit and scope of the present invention; can do various changes and modification, so protection scope of the present invention should be as the criterion with the protection domain of appending claims.
Claims (20)
1. device that detects fault CD disc comprises:
One Spindle Motor is in order to rotate a discs;
One optical read/write head, but this discs of access and control this optical read/write head via one group of drive controlling power and carry out and move radially and a focus direction moves;
One pre-amplifier is connected to this optical read/write head, the electric signal that is produced when receiving this discs of this optical read-write head accessing, and then produce one group of servo error signal, wherein this group servo error signal comprises a wave signal at least;
One controller is connected to this pre-amplifier, in order to produce one group of servo-control signal according to this group servo error signal;
One driver is connected to this controller, in order to produce this group drive controlling power according to this group servo-control signal; And
One railroad flaws detecting device, be connected to this pre-amplifier, whether in order to the position of determining this optical read-write head accessing according to this wave signal is a defect area, when wherein detecting this defect area as if this railroad flaws detecting device, produce a railroad flaws signal to this controller, and then make this controller keep this group servo-control signal.
2. the device of detection fault CD disc as claimed in claim 1, wherein this group drive controlling power comprises a radial drive control and a focus direction drive controlling power.
3. the device of detection fault CD disc as claimed in claim 1, wherein this group servo error signal also comprises a radiofrequency signal, once light adds resultant signal, a tracking error signal and a focus error signal.
4. the device of detection fault CD disc as claimed in claim 1, wherein this group servo-control signal comprises and follows a rail control signal and a focus control signal.
5. the device of detection fault CD disc as claimed in claim 1, wherein when this controller was kept this group servo-control signal, it is constant that this driver can be kept this group drive controlling power.
6. the device of detection fault CD disc as claimed in claim 1, wherein this defect area is a track deformation defect area.
7. the device of detection fault CD disc as claimed in claim 1, when wherein this railroad flaws detecting device produced this railroad flaws signal, this controller can be kept a yield value of this wave signal.
8. a method that detects fault CD disc comprises the following steps:
Determine the data of an optical read head on a lock rail state access one track;
Cut a wave signal and become a wave clock signal;
Determine according to this wave clock signal whether this track is a defect area; And
When this track determines to be positioned at this defect area, keep the invariant position of this optical read/write head.
9. the method for detection fault CD disc as claimed in claim 8, determine that wherein whether this track is that the step of this defect area also comprises:
The a plurality of pulse numbers that produced in this wave clock signal of very first time inside counting; And
When one first count value of described a plurality of pulse numbers during less than one first critical value, judge that this track is this defect area, otherwise, judge that this track is not this defect area.
10. the method for detection fault CD disc as claimed in claim 9 also comprises:
When this optical read head is positioned at this defect area, when this first count value during, judge that this optical read head has left this defect area greater than one second critical value, wherein this second critical value is more than or equal to this first critical value.
11. the method for detection fault CD disc as claimed in claim 9 also comprises:
When this optical read head is positioned at this defect area above one second time, judge that this optical read head has left this defect area.
12. the method for detection fault CD disc as claimed in claim 8 determines that wherein whether this track is that the step of this defect area also comprises:
The a plurality of defective pulse width that is produced in this wave clock signal of one the 3rd time inside counting; And
When one second count value of described a plurality of defective pulse widths during greater than one the 3rd critical value, judge that this track is this defect area, otherwise, judge that this track is not this defect area.
13. the method for detection fault CD disc as claimed in claim 12 also comprises:
When this optical read head is positioned at this defect area, when this second count value during, judge that this optical read head has left this defect area less than one the 4th critical value, wherein the 3rd critical value is more than or equal to the 4th critical value.
14. the method for detection fault CD disc as claimed in claim 12 also comprises:
When this optical read head is positioned at this defect area above one the 4th time, judge that this optical read head has left this defect area.
15. the method for detection fault CD disc as claimed in claim 8 wherein also comprises when this track determines to be positioned at this defect area, keeps a yield value of this wave signal.
16. a method that detects fault CD disc comprises the following steps:
Determine the data of an optical read head on a lock rail state access one track;
Peak according to a wave signal determines to peak value whether this track is a defect area; And
When this track is defined as this defect area, keep the invariant position of this optical read/write head.
17. the method for detection fault CD disc as claimed in claim 16 determines wherein whether this track is that this defect area step also comprises:
When this peak during less than one the 5th critical value, judges that this track is this defect area to peak value, otherwise judge that this track is not this defect area.
18. the method for detection fault CD disc as claimed in claim 16 also comprises:
When this optical read head is positioned at this defect area, when this peak peak value during greater than one the 6th critical value, is judged that this optical read head has left this defect area, wherein the 6th critical value is more than or equal to the 5th critical value.
19. the method for detection fault CD disc as claimed in claim 16 also comprises:
When this optical read head is positioned at this defect area above one the 5th time, judge that this optical read head has left this defect area.
20. the method for detection fault CD disc as claimed in claim 16 wherein also comprises when this track determines to be positioned at this defect area, keeps a yield value of this wave signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710103963 CN101038774A (en) | 2007-05-17 | 2007-05-17 | Device and method for detecting fault CD disc |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710103963 CN101038774A (en) | 2007-05-17 | 2007-05-17 | Device and method for detecting fault CD disc |
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|---|---|
| CN101038774A true CN101038774A (en) | 2007-09-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200710103963 Pending CN101038774A (en) | 2007-05-17 | 2007-05-17 | Device and method for detecting fault CD disc |
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| CN (1) | CN101038774A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101605445B (en) * | 2008-06-10 | 2011-06-22 | 金积德 | Heat transfer unit without liquid injection pipe and manufacture method thereof |
| CN103985395A (en) * | 2014-05-22 | 2014-08-13 | 无锡微焦科技有限公司 | Sliding detection device |
-
2007
- 2007-05-17 CN CN 200710103963 patent/CN101038774A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101605445B (en) * | 2008-06-10 | 2011-06-22 | 金积德 | Heat transfer unit without liquid injection pipe and manufacture method thereof |
| CN103985395A (en) * | 2014-05-22 | 2014-08-13 | 无锡微焦科技有限公司 | Sliding detection device |
| CN103985395B (en) * | 2014-05-22 | 2016-11-09 | 无锡微焦科技有限公司 | A kind of slip detection device |
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Open date: 20070919 |