CN1319056C - Correcting method for tracking front optical read-write head position - Google Patents
Correcting method for tracking front optical read-write head position Download PDFInfo
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- CN1319056C CN1319056C CNB031545793A CN03154579A CN1319056C CN 1319056 C CN1319056 C CN 1319056C CN B031545793 A CNB031545793 A CN B031545793A CN 03154579 A CN03154579 A CN 03154579A CN 1319056 C CN1319056 C CN 1319056C
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- write head
- optical read
- coaster
- tracks
- read
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Abstract
The present invention relates to a correcting method for tracking the position of a front optical read-write head in an optical disc device. The actual position of the optical read-write head is detected before rail jumping, and then, the active force on a jumping rail of a pulley is compensated by the pressure of a platform motor so as to make the optical read-write head after rail jumping positioned in a central position within a moving range.
Description
Technical field
The present invention is the method for calibrating optical read/write head position before following the tracks of in a kind of optical disc apparatus.And particularly provide a kind of method to make in the optical disc apparatus that optical read/write head is in the center of its mobile range before tracking.
Background technology
Servo-drive system in the optical disc apparatus (servo system) its role is to control the data of the correct playback record of optical read/write head on CD.When main frame (host) sent the order that reads or writes, can jump onto the tracks the earlier operation of (seeking) of rail searching servo system (seeking servo) promptly was that optical read/write head is moved on the target rail (target track) of servo-drive system indication; Then carry out lock rail (track on) operation of optical read/write head, determine the operation that then enters tracking (track following) behind the lock rail by tracking servo (tracking servo) catcher.This moment, tracking servo can be adjusted the position that optical read/write head will read or write its arrival, began the operation that reads or writes then.Below will describe optical disc apparatus in detail and when following the tracks of, how adjust the position of optical read/write head.
Please refer to Fig. 1, it is the schematic diagram of optical head module.Optical head module 1 comprises mechanisms such as optical read/write head 3, spring 5 and coaster 7 and laser diode (not shown).When following the tracks of, tracking servo only can be carried out slight position adjustment to optical read/write head 3.This position adjustment promptly is to be finished by spring 5.The acting force that spring 5 applies according to tracking servo slightly mobile optical read/write head 3 as Fig. 1 (b) and (c).Tracking servo detects the position that will read or write, and the power that then acts on spring 5 makes its pulling optical read/write head 3 arrive the position that will read or write.The operation that reads or writes again of optical disc apparatus then.
At the beginning of the operation that reads or writes, optical read/write head 3 can be in the center of coaster 7 shown in Fig. 1 (a).After writing the data of (having read) a good hundreds of track length continuously, position of optical read write head also and then moves shown in Fig. 1 (b) toward the place of direction 2.The moving range of optical read/write head 3 on coaster 7 is conditional.If optical read/write head 3 exceeds the mobile range on coaster 7, then its laser light arrive CD the path shown among Fig. 29, this moment laser to penetrate the quality of beating on CD be not the best, the quality that causes easily reading or writing reduces.If so optical read/write head 3 then causes the read/write failure easily above the mobile range on coaster 7 as from the foregoing.(write/read?fail)。
For avoiding above-mentioned read/write failure, tracking servo can utilize a platform motors voltage (sledmotor control signal:FMO) to adjust the position of optical read/write head 3.The acting force corresponding voltage that this platform motors voltage is movable block 7 by the mobile change optical read/write head 3 of coaster 7 and the relative position of coaster 7, makes the position of optical read/write head 3 in mobile range.
Platform motors voltage is to be obtained through low-pass filter (low passfilter) effect by tracking control signal when following the tracks of.Because of tracking control signal (tracking control output signal) representative be optical read/write head 3 be subjected to force direction and size.Applying force to 7 on coaster according to tracking control signal through the resulting platform motors voltage of low-pass filtering can make optical read/write head 3 maintain in its mobile range.
Please refer to Fig. 3 (a), optical read/write head 3 is in the center of coaster 7 at this moment, and optical read/write head 3 is not stressed, so platform motors voltage drops on the reference voltage.When so beginning to read (writing), servo-drive system is given spring 5 according to the position acting force of reading (writing) makes optical read/write head 3 move toward direction 25.Because of optical read/write head 3 stressed, so platform motors voltage also begins to apply force to coaster 7 shown in Fig. 3 (b).Yet this moment, the acting force of platform motors voltage was not sufficient to movable block (weight of coaster and the relation of friction force).Optical read/write head 3 continues to read (writing) toward direction 25, and the position of optical read/write head 3 also more is offset the center of coaster 7 shown in Fig. 3 (c).This moment, optical read/write head surpassed its mobile range 3 the sixth of the twelve Earthly Branches soon, and the acting force of platform motors voltage also slides toward direction 25 so coaster is stressed greatly to promoting coaster the sixth of the twelve Earthly Branches, and optical read/write head 3 is got back to the center of coaster 7 again shown in Fig. 3 (e).When following the tracks of, servo-drive system promptly is to utilize said procedure that optical read/write head 3 is maintained in its mobile range always.Thus, optical disc apparatus can avoid the situation of read/write failure to take place.
Yet general optical disc apparatus starts above-mentioned mechanism when picture is not followed the tracks of when jumping onto the tracks.When optical disc apparatus receives by jumping onto the tracks during order that servo-drive system is sent,, directly play the operation of mobile block (kick sled) no matter how the relative position of optical read/write head and coaster was at that time.Yet this measure causes optical disc apparatus to enter when following the tracks of easily, and quality is very poor when carrying out the operation that reads or writes.
Please refer to Fig. 4.When the relative position of optical read/write head 3 and coaster 7 was shown in Fig. 4 (a), this moment, servo-drive system was sent the order of jumping onto the tracks, and a coaster acting force 17 can be applied on the coaster 7 makes it slide toward direction 15.When arriving the target rail, optical read/write head 3 can more depart from the center of coaster 7 shown in Fig. 4 (b).If directly enter the step of tracking this moment, then need the more time to adjust the position of optical read/write head 3 and the quality that reads or writes also can be worse.So need a kind of method of more effective control position of optical read write head before the known as can be known optical disc device tracking.
Summary of the invention
The method that the purpose of this invention is to provide calibrating optical read/write head position before following the tracks of in a kind of optical disc apparatus.Solve the problem that enters the bad that reads or writes when following the tracks of after jumping onto the tracks with this.
The method of calibrating optical read/write head position before the present invention proposes to follow the tracks of in a kind of optical disc apparatus.It is summarized as follows: the physical location of judging optical read/write head before jumping onto the tracks; Utilize the acting force of jumping onto the tracks on the platform motors voltage compensation coaster then, the feasible center of back optical read/write head of jumping onto the tracks at mobile range.
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 the explanation usefulness, be not to be used for the present invention is limited.
Description of drawings
Fig. 1 represents that optical read/write head and coaster relative position be not simultaneously to the influence of tracking control signal;
Fig. 2 represents that the laser light path is because of the optical read/write head difference different with the coaster relative position;
When Fig. 3 is tracking, the synoptic diagram of optical read/write head and coaster relative position;
Before Fig. 4 is coaster acting force not compensated, the synoptic diagram of coaster and optical read/write head relative position;
Fig. 5 is a process control chart of the present invention; And
Fig. 6 is for after the present invention compensates the coaster acting force, the synoptic diagram of coaster and optical read/write head relative position.
The figure number explanation
1 optical head module, 11 laser light paths
2 optical read/write head moving directions, 13 platform motors voltages
3 optical read/write heads, 15 coaster directions
4 optical read/write head moving directions, 17 coaster acting forces
5 springs, 19 coaster directions
7 coasters, 21 coaster acting forces
9 laser light paths, 23 coaster acting forces
25 optical read/write head moving directions
Whether 100 jump onto the tracks
The physical location of 110 detection optical read/write heads
120 utilize platform motors voltage compensation coaster acting force
130 jump onto the tracks
Embodiment
In general, optical disc apparatus inside there is no the operation of any calibrating optical read/write head before tracking.As long as servo-drive system is sent the order that reads or writes, the operation of optical disc apparatus with regard to directly jumping onto the tracks.Yet optical disc apparatus has been jumped onto the tracks when then following the tracks of, and the position of its optical read head is not good sometimes, causes the quality that reads or writes bad.In order to overcome the problems referred to above, the present invention proposes a kind of method of following the tracks of preceding calibrating optical read/write head position.
Please refer to Fig. 5, its represented process flow diagram of following the tracks of preceding calibrating optical read/write head position for the present invention.
Step 100: detect the operation whether optical disc apparatus will jump onto the tracks; If, execution in step 110; Otherwise execution in step does not enter this correcting process.
Step 110: the physical location of detection optical read/write head.Certain part optical disc apparatus can utilize errors of centration value (Center Error) signal to come the position of detection optical read/write head when the stage of following the tracks of.The errors of centration value signal is the position signalling of optical head in mobile range, when center error amount during at zero crossing, represents the central authorities of optical read/write head at mobile range.Therefore, when the control of optical read/write head switches to when following the tracks of, the errors of centration value departs from the place, position that the numerical difference between of zero crossing can be learnt optical read/write head.Yet the errors of centration value is easy to just judge by accident the position of optical read/write head sometimes because of the too strong phenomenon that easily produces skew (RunOut) of the swing type on the CD (wobble) architecture signals.Be not again the signal that each optical read/write head all has the errors of centration value, so the errors of centration value might not be represented the relative position of optical read/write head and coaster.
In this embodiment, then adopt platform motors voltage to come the physical location of detection optical read/write head.Please refer to Fig. 3, platform motors voltage originally is to be used for the acting force corresponding voltage that movable block 7 makes the position of optical read/write head 3 obtain adjusting.But because of its representative be coaster suffered acting force when seeking rail, so when the center of optical read/write head 3 at coaster 7, platform motors voltage can drop on the reference voltage shown in Fig. 3 (a).Then the platform motors voltage magnitude was just bigger shown in Fig. 3 (c) when otherwise the position of optical read/write head 3 more was offset the center of coaster 7.So utilize platform motors voltage to come the physical location of detection optical read/write head 3 can be more representative and more accurate than errors of centration value signal.
Step 120: utilize platform motors voltage compensation coaster acting force; In the physical location of step 110 elder generation in the sixth of the twelve Earthly Branches detection optical read/write head, so the position of servo-drive system optometry read/write head is through calculating the required acting force of coaster when compensation is jumped onto the tracks.Follow execution in step 130.
Step 130: jump onto the tracks.
Fig. 6 is the synoptic diagram of present embodiment.When optical disc apparatus sends the order that reads or writes, utilize platform motors voltage to calculate the physical location of optical read/write head 3.The position of optical read/write head 3 is in the center of mobile range as can be known, and by platform motors voltage as can be known optical read/write head 3 and coaster 7 the center range difference distance of 50 rails.Suppose that coaster receives the order of servo-drive system and will jump 500 rails toward direction 19, to give the acting force 21 of coaster according to the platform motors voltage compensation, this coaster acting force 21 will be applied to the acting force of sliding 500 rails on the coaster originally, so only be applied to the acting force that slides 450 rails on the coaster because of platform voltage compensates.When coaster 7 arrives the target rails thus, its optical read/write head 3 with the position in the center of coaster 7 shown in Fig. 6 (b).So when entering tracking phase, read and the quality write is to be the sixth of the twelve Earthly Branches best.Effectively improve the quality that optical disc apparatus is read and write.
Therefore, the invention has the advantages that and utilize existing hardware device, can reach the correction of position of optical read write head before tracking.Be best position of optical read write head the sixth of the twelve Earthly Branches after being compensated the coaster acting force after utilizing platform motors voltage to calculate it being jumped onto the tracks.Even also can utilize above-mentioned mechanism to make optical read/write head behind the optimum position, enter tracking phase again during the lock rail after jumping onto the tracks.Thus optical disc apparatus read or write operation the time just can obtain preferable quality,
Another advantage of the present invention is the position that effective detection optical reads to learn head.Come the position of detection optical read/write head because of the present invention adopts platform motors voltage, come the position of detection optical read/write head more accurate with the errors of centration value as compared with the past.And solve some particular optical read/write head and do not have the problem that the errors of centration value can detection optical read/write head position.And also can this learn that the position of optical read/write head adjusts its position again to obtain preferable read/write quality at the optical disc apparatus of relatively paying attention to the read/write quality.
In sum; though the present invention with preferred embodiment openly as above; right its is not in order to limit the present invention; any those skilled in the art; under the situation that does not break away from the spirit and scope of the present invention; can change and modification, so protection scope of the present invention is as the criterion with the energy range that claim is limited that is proposed.
Claims (4)
1. the method for calibrating optical read/write head position before following the tracks of in the optical disc apparatus includes the following step:
One physical location of detection optical read/write head; And
Be applied to a supratrochlear acting force when utilizing this physical location and a platform motors voltage compensation to jump onto the tracks, make and jump onto the tracks the back optical read/write head in a precalculated position.
2. the method for claim 1 wherein utilizes this a platform motors voltage or an errors of centration value either-or to judge this physical location of optical read/write head.
3. the method for claim 1 wherein obtains this platform motors voltage by a tracking control signal through low-pass filter when following the tracks of.
4. the method for claim 1, wherein this precalculated position is the middle position of optical read/write head mobile range on coaster.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031545793A CN1319056C (en) | 2003-08-19 | 2003-08-19 | Correcting method for tracking front optical read-write head position |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031545793A CN1319056C (en) | 2003-08-19 | 2003-08-19 | Correcting method for tracking front optical read-write head position |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1585002A CN1585002A (en) | 2005-02-23 |
| CN1319056C true CN1319056C (en) | 2007-05-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031545793A Expired - Fee Related CN1319056C (en) | 2003-08-19 | 2003-08-19 | Correcting method for tracking front optical read-write head position |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1302433A (en) * | 1999-02-26 | 2001-07-04 | 松下电器产业株式会社 | Optical information recording/reproducing device |
| US20020186626A1 (en) * | 2001-06-12 | 2002-12-12 | Samsung Electronics Co., Ltd. | Method of controlling side push-pull balance in dual push-pull type tracking servo |
| JP2003173549A (en) * | 2001-11-30 | 2003-06-20 | Toshiba Corp | Optical disk device and focus offset adjusting method |
-
2003
- 2003-08-19 CN CNB031545793A patent/CN1319056C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1302433A (en) * | 1999-02-26 | 2001-07-04 | 松下电器产业株式会社 | Optical information recording/reproducing device |
| US20020186626A1 (en) * | 2001-06-12 | 2002-12-12 | Samsung Electronics Co., Ltd. | Method of controlling side push-pull balance in dual push-pull type tracking servo |
| JP2003173549A (en) * | 2001-11-30 | 2003-06-20 | Toshiba Corp | Optical disk device and focus offset adjusting method |
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| Publication number | Publication date |
|---|---|
| CN1585002A (en) | 2005-02-23 |
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