CN1302465C - Error control processing method for rail searching servo of optical disk machine - Google Patents
Error control processing method for rail searching servo of optical disk machine Download PDFInfo
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- CN1302465C CN1302465C CNB031101739A CN03110173A CN1302465C CN 1302465 C CN1302465 C CN 1302465C CN B031101739 A CNB031101739 A CN B031101739A CN 03110173 A CN03110173 A CN 03110173A CN 1302465 C CN1302465 C CN 1302465C
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- optical head
- rail
- servo system
- middle position
- mobile range
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Abstract
The present invention provides an error control processing method for rail searching servo of an optical disk machine, which is used for starting to detect a central error value signal when an optical head Track On action starts, namely that the control of an optical head is switched to a tracking servo system from a seeking servo system. When the value of the central error value signal is bigger than a predetermined value, the Track On action of the optical head is given up. Subsequently, a central servo control system is started or the optical head swings by a natural frequency, which makes the optical head carry out another Track On action after moving to a central location within the movable range.
Description
Technical field
The present invention relates to a kind of CD-ROM device rail searching servo control method, particularly a kind of wrong control and treatment method of CD-ROM device rail searching servo.
Background technology
CD-RW discsCD-RW is the Storage Media of random access fast (Random Access).In order to reach this requirement, CD-ROM device is necessary can be at any time at faster speed, utilize rail searching servo system (Seeking Servo), after accurately coaster (Sledge) being delivered to the target location, carry out locking track by optical head (Track On) action by cyclic track servo system (Tracking Servo) catcher.Yet under the double requirements of speed and precision, optical head can be lost Jiao unavoidably or rock excessive etc. all multifactorly, causes coaster to arrive the target location and but can't in time optical head be locked on the target track.
For instance, please refer to Figure 1A, its illustrate is locked the synoptic diagram of rail action for known coaster and optical head.In general, CD-ROM device is the lock rail that is carried out optical head 24 by rail searching servo system control coaster 26 to the target location by cyclic track servo system when making long distance tracking (Long Seek).And on coaster 26, have a mobile range 27 provide optical head 24 as the lock rail, follow rail (Follow) or the short fine setting scope of optical head 24 when jumping onto the tracks (Short Seek).In general, optical head all can rest on the middle position of mobile range without any control the time.And in Figure 1A, after coaster 26 moved to the target location, cyclic track servo system was that the may command optical head pins the target track 23 on the CD-RW discsCD-RW 22.
And the switching between rail searching servo system and the cyclic track servo system is to be controlled by the control wafer in the CD-ROM device, and a lock rail signal is arranged in the control wafer.That is control wafer is calculated the rail searching servo system and is driven the track number that coaster is crossed over, and starts lock rail signal when arriving the target location, promptly switches to cyclic track servo system this moment and locks the rail action.
Please refer to Figure 1B and 1C, its illustrate is locked the synoptic diagram of rail action for known coaster and optical head.The coaster of being controlled when the rail searching servo system 26 just over or when still the no show target location promptly stopped, the optical head 24 that cyclic track servo system is controlled also can be at the target track 23 that moves among the mobile range 27 and pin on the CD-RW discsCD-RW 22.
But when the rail action was locked on the border of close mobile range 27 in the position of optical head 24, optical head 24 might drive coaster 26, causes coaster 26 to produce a displacement.Because moving of coaster 26 also can drive moving of optical head 24.Therefore, can cause the baulk of whole lock rail, make optical head 24 present unsettled concussion state.Certainly, cause the reason of optical head lock rail baulk many in addition, a kind of common optical head of only simple herein proposition is locked the example of rail baulk.
Please refer to Fig. 2, the oscillogram of related signal when its illustrate is locked the rail action for known coaster and optical head.Wherein, under rail searching servo system control, stride the track number that optical head that on behalf of coaster, rail error (Tracking Error) signal drive had been crossed over.When optical head strode across a track, striding the rail error signal can present a sine wave through zero passage crossover point (Zero Cross Point) 52, and stride the rail error signal and exported by the rail searching servo system this moment.So the peak value of striding the rail error signal via calculating can be known the track number that optical head that coaster drives has striden across, and in good time when coaster arrives the target location, switch to cyclic track servo system, begin to carry out the locking track by optical head action.
When lock rail when beginning action, stride the rail error signal and can switch to and export by cyclic track servo system.The rail error signal of striding of this moment is to represent optical head to follow the situation of rail.
Moreover errors of centration value (Center Error) signal is the position signal of optical head in mobile range, when center error amount during at zero crossover point, represents the central authorities of optical head at mobile range.
As shown in the figure, when time point 56, coaster has arrived the target location.At this moment, the control wafer in the CD-ROM device can start a lock rail signal (not shown).Therefore, by stride the rail error signal as can be known the rail searching servo system switched to cyclic track servo system, and stable as can be known by striding rail error signal and the very fast arrival of errors of centration value signal, optical head success finish the action of lock rail.
When time point 57, optical head has begun the long distance tracking of another time, and when time point 58, coaster has arrived the target location, and therefore striding the rail error signal switches to cyclic track servo system by the rail searching servo system.And at this moment, because lock rail baulk optical head is biased to a side of mobile range, the particular value of the negative that presented of errors of centration value signal just.At this moment, represent optical head to present unsettled concussion state.And can learn also that by striding the rail error signal cyclic track servo system has no idea to control optical head and arrive stable status this moment.Therefore as can be known, after time point 58, be situation for the failure of optical head lock rail by above-mentioned phenomenon.
In known technology, during the baulk of optical head lock rail, optical head can present unsettled concussion state, and cyclic track servo system is attempting carrying out very difficulty of locking track by optical head action meeting.As shown in Figure 2, though expended considerable time (t), optical head still can not be locked the rail success.
Summary of the invention
The objective of the invention is after determining the baulk of lock rail, abandon the action of whole optical head lock rail immediately, and make optical head get back to the middle position of mobile range fast, switch to cyclic track servo system afterwards once more and carry out the action of another lock rail.
The present invention proposes a kind of wrong control and treatment method of rail searching servo, includes the following step:
When the control of optical head switches to cyclic track servo system by the rail searching servo system, begin to detect errors of centration value signal; When center error amount signal arrives predetermined value, optical head is moved to the middle position of mobile range; And, the control of optical head is switched to cyclic track servo system.
The present invention also proposes a kind of wrong control and treatment method of rail searching servo, includes the following step:
When the control of optical head switches to cyclic track servo system by the rail searching servo system, begin to detect feeding motor signal; When feeding motor signal during, optical head is moved to the middle position of mobile range, and the control of optical head is switched to this cyclic track servo system greater than predetermined value.
Description of drawings
Figure 1A, 1B, 1C illustrate are locked the synoptic diagram of rail action for known coaster and optical head;
The oscillogram of related signal when Fig. 2 illustrate is locked the rail action for known coaster and optical head; And
The oscillogram of related signal when Fig. 3 illustrate is locked the rail action for coaster of the present invention and optical head; And
Fig. 4 illustrate is the wrong control and treatment process flow diagram of CD-ROM device rail searching servo of the present invention.
Embodiment
Cyclic track servo system is being attempted carrying out the locking track by optical head action and can expended considerable time when the present invention is directed to the baulk of known optical head lock rail, perhaps can not finish the improvement that the action of lock rail is done fully.The present invention begins to calculate the lock rail time when optical head lock rail action beginning.In general, very of short duration of the time that the action of optical head lock rail is spent can be finished the locking track by optical head action greatly within several microseconds (μ s).And according to embodiments of the invention, the present invention can learn via observing errors of centration value (Center Error) signal whether the action of lock rail is successful.Errors of centration value signal is the position signal of optical head in mobile range, when center error amount during at zero crossover point, represents the central authorities of optical head at mobile range.Therefore, when the control of optical head switched to cyclic track servo system, in the middle of the process of lock rail, errors of centration value offset from zero crossover point can be considered the baulk of lock rail when too greatly extremely surpassing a predetermined value.
And when the baulk of lock rail, optical head can present unsettled concussion state, and can utilize central servocontrol (Center Servo Control) system this moment, forces optical head to move to the middle position of mobile range fast, shakes no longer back and forth.If there is not central servo control system in the CD-ROM device, also can utilize optical head the time without any control, all can rest on the characteristic of the middle position of mobile range, make optical head swing, till natural damping (Damping) is rocked optical head to diminish and got back to the middle position of mobile range with free-running frequency.
After optical head arrival is stable, once more optical head is switched to cyclic track servo system, because last time the rail searching servo system controlled to target track with coaster, so the action of the lock rail of another time can be very quick.
Illustrate as Fig. 3, when time point 72, coaster has arrived the target location.At this moment, lock rail signal starts, and system switches to cyclic track servo system by rail searching servo, and begins to calculate the lock rail time.At this moment stride the rail error signal and errors of centration value signal all presents unsettled concussion, represent optical head to present unsettled concussion state.That is cyclic track servo system is had no idea to control optical head and is arrived stable status.Therefore, can be considered the baulk of lock rail, when center error amount signal arrives a predetermined value (Δ V), that is, after the time of lock rail action beginning Δ t1, promptly abandon whole lock rail action, that is when time point 74, abandon whole lock rail action.
And at time point 74 to (altogether Δ t2 time) between the time point 78, optical head returns back to the middle position of mobile range.This action is to utilize central servo control system, force optical head to move to the middle position of mobile range fast or make optical head with free-running frequency swing till natural damping (Damping) is rocked optical head to diminish and is got back to the middle position of mobile range.
And when time point 78, optical head has arrived the middle position of mobile range, and is directly switch into cyclic track servo system and locks rail action, and lock that the rail action can be very fast for the second time finish the locking track by optical head action.
Please refer to the wrong control and treatment process flow diagram of its illustrate of Fig. 4 into CD-ROM device rail searching servo of the present invention.
S100: the control of optical head switches to cyclic track servo system by the rail searching servo system;
S110: whether the size of detecting errors of centration value signal is greater than a predetermined value; Skip to step S150 when not surpassing, skip to step S120 when surpassing;
S120: stop cyclic track servo system control optical head;
S130: optical head is moved to the mobile range middle position;
S140: the control of optical head is switched to cyclic track servo system;
S150: finish.
Therefore, the wrong control and treatment method of CD-ROM device rail searching servo of the present invention is a detecting errors of centration value signal when optical head lock rail action beginning.When the size of center error amount arrives a predetermined value, promptly abandon the locking track by optical head action.Then, start central servo control system or allow optical head swing with free-running frequency, make that optical head moves to the middle position of mobile range after, carry out the action of another lock rail again.
Therefore, advantage of the present invention is after determining the baulk of lock rail, abandons the action of whole optical head lock rail immediately, and makes optical head get back to the middle position of mobile range fast, switches to cyclic track servo system afterwards once more and carries out the action of another lock rail.Compared to known technology, the present invention can significantly shorten optical head after the failure of lock rail, carries out the lock rail spent time of action with cyclic track servo system control optical head.And improve the efficient that the overall optical disc player is read the data of distinguishing, to save unnecessary time waste, the success ratio that simultaneously also can the raising data reads/write down.
Moreover embodiments of the invention are that detecting errors of centration value signal judges whether optical head locks the rail success.Yet the present invention is not limited to only detect errors of centration value signal.With above-mentioned identical judgement principle, the present invention also can utilize and judge (Feed Motor, FM) whether signal judges above the mode of a predetermined value whether optical head locks the rail success to the feeding motor.
In sum; though the present invention discloses as above with preferred embodiment, so it is not that those skilled in the art without departing from the spirit and scope of the present invention in order to qualification the present invention; can be used for a variety of modifications and variations, so protection scope of the present invention is as the criterion with appending claims.
Claims (8)
1. the wrong control and treatment method of a rail searching servo includes the following step: when the control of an optical head switches to a cyclic track servo system by a rail searching servo system, begin to detect an errors of centration value signal;
When this errors of centration value signal during, this optical head is moved to the middle position of a mobile range greater than a predetermined value; And
The control of this optical head is switched to this cyclic track servo system.
2. the method for claim 1, wherein be whether to be started by a lock rail signal to decide the opportunity that switches to this cyclic track servo system by this rail searching servo system.
3. the method for claim 1, the middle position that wherein this optical head is moved to this mobile range provides a central servo control system, makes optical head move to the middle position of this mobile range.
4. the method for claim 1, the middle position that wherein this optical head is moved to this mobile range are with free-running frequency swing and utilize a natural damping to make this optical head move to the middle position of this mobile range with this optical head.
5. the wrong control and treatment method of a rail searching servo includes the following step: when the control of an optical head switches to a cyclic track servo system by a rail searching servo system, begin to detect a feeding motor signal;
When this feeding motor signal during, this optical head is moved to the middle position of a mobile range greater than a predetermined value; And
The control of this optical head is switched to this cyclic track servo system.
6. method as claimed in claim 5, wherein be whether to be started by a lock rail signal to decide the opportunity that switches to this cyclic track servo system by this rail searching servo system.
7. method as claimed in claim 5, the middle position that wherein this optical head is moved to this mobile range provides a central servo control system, makes optical head move to the middle position of this mobile range.
8. method as claimed in claim 5, the middle position that wherein this optical head is moved to this mobile range are with free-running frequency swing and utilize a natural damping to make this optical head move to the middle position of this mobile range with this optical head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031101739A CN1302465C (en) | 2003-04-15 | 2003-04-15 | Error control processing method for rail searching servo of optical disk machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031101739A CN1302465C (en) | 2003-04-15 | 2003-04-15 | Error control processing method for rail searching servo of optical disk machine |
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| Publication Number | Publication Date |
|---|---|
| CN1538406A CN1538406A (en) | 2004-10-20 |
| CN1302465C true CN1302465C (en) | 2007-02-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB031101739A Expired - Fee Related CN1302465C (en) | 2003-04-15 | 2003-04-15 | Error control processing method for rail searching servo of optical disk machine |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1110764A (en) * | 1997-06-20 | 1999-01-19 | Daiwabo Co Ltd | Mat having low frictional front surface and high frictional rear surface |
| JP2001034960A (en) * | 1999-07-27 | 2001-02-09 | Nec Corp | Optical disc device |
| US6292444B1 (en) * | 1995-08-07 | 2001-09-18 | Fujitsu Limited | Optical storage device made thinner by substituting electrical means for capabilities of sensors |
| JP2002123951A (en) * | 2000-10-17 | 2002-04-26 | Sharp Corp | Disk drive |
| CN1371094A (en) * | 2001-02-26 | 2002-09-25 | 扬智科技股份有限公司 | CD machine carrier controlling system and method |
| CN1392544A (en) * | 2001-06-19 | 2003-01-22 | 扬智科技股份有限公司 | Control system and method for long distance tracking for CD machine |
| CN1508777A (en) * | 2002-12-19 | 2004-06-30 | 建兴电子科技股份有限公司 | Error control processing method for CD drive track-finding servo |
-
2003
- 2003-04-15 CN CNB031101739A patent/CN1302465C/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6292444B1 (en) * | 1995-08-07 | 2001-09-18 | Fujitsu Limited | Optical storage device made thinner by substituting electrical means for capabilities of sensors |
| JPH1110764A (en) * | 1997-06-20 | 1999-01-19 | Daiwabo Co Ltd | Mat having low frictional front surface and high frictional rear surface |
| JP2001034960A (en) * | 1999-07-27 | 2001-02-09 | Nec Corp | Optical disc device |
| JP2002123951A (en) * | 2000-10-17 | 2002-04-26 | Sharp Corp | Disk drive |
| CN1371094A (en) * | 2001-02-26 | 2002-09-25 | 扬智科技股份有限公司 | CD machine carrier controlling system and method |
| CN1392544A (en) * | 2001-06-19 | 2003-01-22 | 扬智科技股份有限公司 | Control system and method for long distance tracking for CD machine |
| CN1508777A (en) * | 2002-12-19 | 2004-06-30 | 建兴电子科技股份有限公司 | Error control processing method for CD drive track-finding servo |
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| Publication number | Publication date |
|---|---|
| CN1538406A (en) | 2004-10-20 |
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