CN1251202C - Method of adaptability brake after seeking track of optical disk rapidly - Google Patents
Method of adaptability brake after seeking track of optical disk rapidly Download PDFInfo
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- CN1251202C CN1251202C CN 03128449 CN03128449A CN1251202C CN 1251202 C CN1251202 C CN 1251202C CN 03128449 CN03128449 CN 03128449 CN 03128449 A CN03128449 A CN 03128449A CN 1251202 C CN1251202 C CN 1251202C
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- rail
- write head
- seeking
- braking force
- optical read
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Abstract
The present invention relates to a method of adaptability braking after rapid seeking of an optical drive, which comprises the following steps: sensing a seeking error signal of an optical read and write head in the rapid seeking process; converting a seeking speed of the optical read and write head by the seeking error signal; applying braking force to the optical read and write head, wherein the braking force is changed along with the seeking speed until the rapid seeking process is end.
Description
Technical field
The present invention relates to the adaptability brake method after a kind of CD-ROM drive is sought rail fast, particularly, according to the rail speed of the seeking difference of CD ROM reading-writing head, but correspondence imposes the CD ROM reading-writing head braking force of modulation, makes CD ROM reading-writing head be able to quick location, promotes the rail speed of seeking.
Background technology
Because the arriving in digitized information epoch, also grow with each passing day the deposited demand of the storage volume that the early stage floppy disk (floppy disk) that generally uses can provide for the demand of portable digital Storage Media with high power capacity.Therefore, just have high storage capacity, the optical storage media and the storage device of characteristic such as be easy to carry promptly be widely used, as CD-ROM drive (CD-ROM drive), CD writer (CD-R drive) and LD (LaserDisc) player or the like.
In described optical storage media, data all are to be recorded on the discoid discs (OpticalDisk), the track bar (Information Track) that has the form concentric spirals shape on this kind CD, data are promptly by the section that forms (Optical Contrast) character that has the different optical contrast on track bar record in addition.
On track bar, read or when writing data, CD-ROM drive or CD writer can be rotated discs, and on track bar, throw and absorb light beam (light beam) and carry out reading or writing of data via the lens (lens) of optical read/write head (pick up head).At this moment, screw out by the center one side direction outside by discs owing to the track bar curl, no matter therefore when reading or write data, CD-ROM drive or CD writer all must make read/write head move laterally at the center from discs along with the rotation of discs, so that the read/write head center of aligned data rail correctly, the motion of this kind read/write head is commonly referred to as seeks rail motion (Track-following), and its direction of motion is called as and seeks rail direction (Tracking direction), and the system of this kind of control action then is called as and seeks rail service system (Tracking Servo System) in CD-ROM drive or the CD writer simultaneously.
And before seeking rail motion beginning, the action that optical read/write head is moved to correct track promptly is called seeks rail (Seeking) motion.Fig. 1 has shown the diagrammatic cross-section of a CD-ROM drive or CD writer read/write head and discs rotating mechanism.Discs 11 has a spiral helicine track bar 111, is placed on to use on the spinner 12 to be rotated.13 of read/write heads have lens 131 and make lens carry out trickle fine setting of seeking the rail motion actuates/detent (actuator) 132.In addition, coarse adjustment actuate/the rail motion of seeking that 14 auxiliary read/write heads 13 of detent carry out longer distance actuates/deficiency of detent 132 with auxiliary fine setting.
Fig. 2 has shown in tradition, the calcspar of seeking the rail service system that described CD-ROM drive or CD writer are used.Assembly identical with Fig. 1 among Fig. 2 uses identical symbol.Seeking rail service system 2 is a loop (closed loop), comprise a fine setting controller 211, a fine setting driver 212, fine setting actuate/detent 132, a coarse adjustment controller 221, a coarse adjustment driver 222, coarse adjustment actuate/detent 14, an optical sensor 23 and an amplifier 24.
After fine setting controller 211 receives the TES signal that is exaggerated, produce one with the fine setting controlled quentity controlled variable of position deviation amount linear dependence (relation of two variablees can on coordinate in line), and export fine setting driver 212 to via a fine setting control signal FCS.Output one fine setting drive signal FDS actuates/detent 132 to finely tuning behind the fine setting driver 212 reception fine setting control signal FCS, fine setting is actuated/13 displacements of detent 132 generations one fine setting expulsive force promotion read/write head, and the size of wherein finely tuning expulsive force is also linear relevant with the fine setting controlled quentity controlled variable of fine setting control signal FCS output.
221 of coarse adjustment controllers receive the fine setting control signal FCS of fine setting controller 211 outputs, because its sampling frequency is lower than the sampling frequency of fine setting controller 211, therefore fine setting control signal FCS are had the effect of low-pass filter (low-pass filtering).So, produce the coarse adjustment control signal CCS of an exportable coarse adjustment controlled quentity controlled variable.Coarse adjustment driver 222 receives behind the coarse adjustment control signal CCS output one coarse adjustment drive signal CDS and actuates/detent 14 to coarse adjustment, coarse adjustment is actuated/13 displacements of detent 14 generations one coarse adjustment expulsive force promotion read/write head, and the size of wherein coarse adjustment expulsive force is also linear relevant with the coarse adjustment controlled quentity controlled variable of coarse adjustment control signal CCS output.
Described tradition is sought in the rail motion, before being about to arrive track bar 111, read/write head 13 promptly need carry out the brake of read/write head 13, generally speaking, coarse adjustment controller 221 is within a certain period of time, the fixing coarse adjustment drive signal CDS of output one actuates/detent 14 to coarse adjustment, make coarse adjustment actuate/detent 14 produces the position that a fixing braking force reduces read/write head 13 velocity of displacements and then is parked in track bar 111, carry out again seeking the rail motor program with what track bar 111 was advanced.
But because given traditionally braking force, the speed that often can not adaptability cooperates read/write head 13, be to utilize to bestow the braking force that the first fixedly braking force of optical R/W or continues the set time, often cause braking force excessive, read/write head 13 stops ahead of time, or braking force is low excessively, problems such as read/write head 13 no show track bars 111 promptly stop, or even braking force is excessive, and read/write head 13 is acutely shaken, and can't aim at all the time with track bar 111 centers.
Summary of the invention
Purpose of the present invention is for providing the adaptability brake method after a kind of CD-ROM drive is sought rail fast, and the braking force of realizing optical head is according to seeking the rail speed fluctuation, can make optical read/write head long distance tracking process latter stage, and brake fast arrives the track bar that institute desires to read and locatees.
Purpose technical scheme of the present invention is:
(f) a kind of CD-ROM drive is sought the adaptability brake method behind the rail fast, comprises the following steps: the position deviation amount between (a) sensing one optical read/write head and the discs track bar center and produce one to seek the rail error signal; (b) seek the rail speed of seeking that the rail error signal calculation goes out described optical read/write head by described, wherein, seek the rail error signal for sinusoidal wave continuously, whenever stride across a track bar and promptly produce a sine wave, waveform is intensive more, and the rail speed of seeking of optical read/write head is fast more; (c) the rail speed of seeking by described optical read/write head decides needed braking force, and it is big more that this seeks rail speed, and then needed braking force is big more; (d) described braking force is put on the described optical read/write head; Repetition above-mentioned steps (a) and (b), (c), (d) arrive the track bar that reads in advance up to described optical read/write head, and stop long-range addressing campaign.
Wherein, in step (a) before, the step that more comprises a set distance D of setting, and the distance that arrives described discs track bar center when described optical read/write head is just carried out described step (a) and (b), (c), (d), (e) when equaling the set distance D of described setting.
In the step (c) with a coarse adjustment actuate/detent provides described braking force.
Produce the described rail error signal of seeking with the position deviation amount between the described optical read/write head of an optical sensor sensing and this discs track bar center in the step (a).
Described step (c) is to seek rail speed according to this, by selecting a specific braking force to put on the described optical read/write head among a plurality of braking forces, it is big more that this seeks rail speed, then selected braking force is big more, when the frequency of seeking the rail error signal is 12.5Hz, apply-braking force of 0.32V, when the frequency of seeking the rail error signal was 5.15Hz, the braking force that applies was-0.19V.
According to the present invention, the braking force of optical head is according to seeking the rail speed fluctuation, can make optical read/write head long distance tracking process latter stage, and brake fast arrives the track bar that institute desires to read and locatees.
Description of drawings
Fig. 1 is the diagrammatic cross-section of a CD ROM reading-writing head and discs rotating mechanism;
Fig. 2 is the calcspar that a tradition is sought the rail service system;
Fig. 3 is one embodiment of the invention process flow diagram;
Fig. 4, Fig. 5 are for showing the flow process according to Fig. 3, the braking force signal of seeking rail error signal and correspondence that institute goes out via experimental simulation.
Symbol description:
11 discs; 111 track bars;
12 spinners; 13 read/write heads;
131 lens; 132 fine settings are actuated/detent;
14 coarse adjustment are actuated/detent; 211 fine setting controllers;
212 fine setting drivers; 221 coarse adjustment controllers;
222 coarse adjustment drivers; 23 optical sensors;
24 amplifiers.
Embodiment
For making for the purpose of described and other purpose of the present invention, feature and advantage can become apparent, a preferred embodiment cited below particularly, and conjunction with figs. elaborate.
See also Fig. 3, seek the process flow diagram of the adaptability brake method behind the rail for the present embodiment CD-ROM drive fast.The present invention is the latter stage in long distance tracking motion, be used to control coarse adjustment actuate/detent to be to reach the method for optical read/write head brake control.At first, by the optical sensor sensing optical read/write head of CD-ROM drive and the position deviation amount at a discs track bar center, seek the rail error signal in step 51 and produce one.Then, in step 52, according to seeking the rail error signal, the calculating optical read/write head at that time the rail speed of seeking and make optical read/write head be positioned to desire the required braking force of reading of data rail.Come again,, the braking force that calculates gained is put on optical read head in step 53.Then, in step 54, judge whether optical read/write head has arrived the track bar of desiring to read, and stopped the long distance tracking motion, if, then this adaptability brake flow process finishes, if not, then get back to step 51, repeat described flow process, arrive the track bar of desiring to read up to optical read/write head, and stopped the long distance tracking motion and process ends.
According to described method, can be according to the actual rail speed of seeking of optical read/write head, the control braking force so that fast and accurately optical read/write head is locked the track bar of desiring to read, shortens the long distance tracking time.
Fig. 4 and Fig. 5 are the flow processs that shows according to the 3rd figure, the braking force signal of seeking rail error signal and correspondence that institute goes out via experimental simulation.Wherein, seek the rail error signal and be generally continuous sine wave, whenever stride across a track bar and promptly produce a sine wave, waveform is intensive more, the rail speed of seeking of expression optical read/write head is fast more, and wherein, the braking force signal begins effect before long distance tracking is about to arrive the track bar of desiring to read, do suitably to adjust with seeking rail speed, arrive the tentation data rail up to optical read/write head.In Fig. 4, as can be seen, it is very fast that optical read/write head is striden rail speed, frequency is higher, be about 12.5Hz, then when optical R/W be about to arrive desire to read track bar the time, be by among the figure during initial point, the present invention is according to the rail speed of seeking of optical read/write head, imposes the pulse wave of the braking force (" " represent opposite with the optical read/write head direct of travel) of one-0.32V in special time; In Fig. 5, as can be seen, it is slower that optical read/write head is striden rail speed, frequency is lower, be about 5.15Hz, then when optical R/W be about to arrive desire to read track bar the time, be by among the figure during initial point, the present invention is according to the rail speed of seeking of optical read/write head, imposes the pulse wave of the braking force (" " represent opposite with the optical read/write head direct of travel) of one-0.19V again in the special time.Therefore, among the present invention, the size of braking force and apply the braking force duration is to do change but not certain value with seeking rail speed.
In addition, the action moment of this brake method can be set in and arrive predeterminable range the last period of desiring the reading of data rail according to the CD-ROM drive design of service system, with the action of this brake mechanism of effective control.
Though the present invention discloses as above with preferred embodiment; right its be not to be defined in the present invention, anyly have the knack of this skill person, without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking accompanying the claim person of defining.
Claims (5)
1, a kind of CD-ROM drive is sought the adaptability brake method behind the rail fast, it is characterized in that, comprises the following steps:
(a) the position deviation amount between sensing one optical read/write head and the discs track bar center and produce and seek the rail error signal;
(b) seek the rail speed of seeking that the rail error signal calculation goes out described optical read/write head by described, wherein, seek the rail error signal for sinusoidal wave continuously, whenever stride across a track bar and promptly produce a sine wave, waveform is intensive more, and the rail speed of seeking of optical read/write head is fast more;
(c) the rail speed of seeking by described optical read/write head decides needed braking force, and it is big more that this seeks rail speed, and then needed braking force is big more;
(d) described braking force is put on the described optical read/write head;
(e) repetition above-mentioned steps (a) and (b), (c), (d) arrive the track bar that reads in advance up to described optical read/write head, and stop long-range addressing campaign.
2, CD-ROM drive according to claim 1 is sought the adaptability brake method behind the rail fast, it is characterized in that, in step (a) before, comprise that more one sets the step of set distance D, and when the distance that arrives described discs track bar center when described optical read/write head equals the set distance D of described setting, just carry out above-mentioned steps (a) and (b), (c), (d), (e).
3, CD-ROM drive according to claim 1 is sought the adaptability brake method behind the rail fast, it is characterized in that, in the step (c) with a coarse adjustment actuate/detent provides described braking force.
4, CD-ROM drive according to claim 1 is sought the adaptability brake method behind the rail fast, it is characterized in that, produce the described rail error signal of seeking with the position deviation amount between the described optical read/write head of an optical sensor sensing and this discs track bar center in the step (a).
5, CD-ROM drive according to claim 1 is sought the adaptability brake method behind the rail fast, it is characterized in that, described step (c) is to seek rail speed according to this, by selecting a specific braking force to put on the described optical read/write head among a plurality of braking forces, it is big more that this seeks rail speed, and then selected braking force is big more, when the frequency of seeking the rail error signal is 12.5Hz, apply-braking force of 0.32V, when the frequency of seeking the rail error signal was 5.15Hz, the braking force that applies was-0.19V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03128449 CN1251202C (en) | 2003-04-24 | 2003-04-24 | Method of adaptability brake after seeking track of optical disk rapidly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03128449 CN1251202C (en) | 2003-04-24 | 2003-04-24 | Method of adaptability brake after seeking track of optical disk rapidly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1540641A CN1540641A (en) | 2004-10-27 |
| CN1251202C true CN1251202C (en) | 2006-04-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03128449 Expired - Fee Related CN1251202C (en) | 2003-04-24 | 2003-04-24 | Method of adaptability brake after seeking track of optical disk rapidly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1251202C (en) |
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2003
- 2003-04-24 CN CN 03128449 patent/CN1251202C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1540641A (en) | 2004-10-27 |
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