CN100454400C - Method for jumping tracks in optical disk drive - Google Patents
Method for jumping tracks in optical disk drive Download PDFInfo
- Publication number
- CN100454400C CN100454400C CNB200510118743XA CN200510118743A CN100454400C CN 100454400 C CN100454400 C CN 100454400C CN B200510118743X A CNB200510118743X A CN B200510118743XA CN 200510118743 A CN200510118743 A CN 200510118743A CN 100454400 C CN100454400 C CN 100454400C
- Authority
- CN
- China
- Prior art keywords
- adjustment knob
- deviation signal
- value
- tracks
- eigenwert
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
Abstract
An orbit-hopping method of optical disc player includes calculating deviation signal value of relative position deviation at fine regulator to rough regulator, comparing whether deviation signal value is within threshold range of deviation signal value or not and outputting a character value to push said rough regulator if it is not then hopping to object orbit.
Description
Technical field
The present invention relates to a kind of method for jumping tracks of CD player, particularly relate to utilizing and judge that whether a deviation signal value of fine adjustment knob and coarse adjustment knob relative position deviation falls within a deviation signal value threshold interval, exports an eigenwert and makes fine adjustment knob be in the CD player method for jumping tracks between the coarse adjustment knob central area.
Background technology
The operation of jumping onto the tracks that general CD player is produced when reading CD is by a coarse adjustment knob, and promptly coaster affects a fine adjustment knob, i.e. object lens, form.Coarse adjustment knob is controlled by d.c. motor and screw rod, and the amplitude of walking about is bigger.Fine adjustment knob is connected on the coarse adjustment knob, forms a thin tuning mechanism, activates by voice coil motor usually.When fine adjustment knob was jumped onto the tracks arrival coarse adjustment knob edge, in order to proceed to jump onto the tracks, coarse adjustment knob must move, and fine adjustment knob can be proceeded to jump onto the tracks.If coarse adjustment knob makes fine adjustment knob move to the edge of coarse adjustment knob, the fine adjustment knob failure of will jumping onto the tracks.
Therefore, at first please refer to shown in Figure 1, the known optical disc machine can be followed mutually for making coarse adjustment knob and fine adjustment knob, and wherein speed command 11 is assigned the speed that requires fine adjustment knob 18 to walk for system, and speed detects 15 for detecting the in fact speed of fine adjustment knob 18 walkings.When fine adjustment knob 18 carries out the speed adjusting, speed command 11 is imported controller 12 respectively with the velocity amplitude of speed detection 15, both velocity errors are via controller 12 computings, output fine setting controlling signal drives fine adjustment knob 18 to thin driving circuit 13 and jumps onto the tracks, export coarse adjustment controlling signal to thick driving circuit 14 control d.c. motors 16 simultaneously and promote coarse adjustment knob 17, allow coarse adjustment knob 17 be cooperated the speed of jumping onto the tracks of fine adjustment knob 18, and the situation of the error of can not jumping onto the tracks.Yet in this adjustment, fine adjustment knob 18 and coarse adjustment knob 17 can be adjusted simultaneously, and fine adjustment knob 18 is positioned at the middle position interval of coarse adjustment knob 17 in the time of can't guaranteeing to jump onto the tracks, and often causes the failure of jumping onto the tracks.
In addition, because the mechanism of jumping onto the tracks of CD player is accurately relevant with the difference of the controller good and the bad and motion, if driving force can't promote coarse adjustment knob 17, driving force can be accumulated up to overcoming stiction mobile coarse adjustment knob 17 always, if it is excessive to promote the driving force of coarse adjustment knob 17, cause exaggerated correction coarse adjustment knob 17 can't cooperate with fine adjustment knob 18.Therefore, can produce and react slow or proofreaied and correct failure, and when jumping onto the tracks operation, produce error.
Therefore, how improving the adjustment of the problem and the driving force of relative distance between fine adjustment knob and the coarse adjustment knob, allow fine adjustment knob remain on coarse adjustment knob central authorities, make things convenient for fine adjustment knob can not fail in the operation of jumping onto the tracks, will be CD player dealer problem to be solved.
Summary of the invention
The method for jumping tracks that the purpose of this invention is to provide a kind of CD player, offset deviation signal by thinner regulator and coarse adjustment knob, in the time of outside falling within the offset deviation threshold range, the input feature vector value is in d.c. motor, wherein eigenwert can be magnitude of voltage or current value, impels its offset deviation to fall within the deviation signal value threshold range, allows fine adjustment knob fall within the central range of coarse adjustment knob, avoid fine adjustment knob to be displaced to the edge of coarse adjustment knob, and when jumping onto the tracks operation, produce error.
Another purpose of the present invention is providing a kind of method for jumping tracks of CD player, after the input feature vector value promotes coarse adjustment knob, whether detect coarse adjustment knob according to deviation signal lifting situation is pushed, if do not have, then the eigenwert that input is bigger promotes coarse adjustment knob, till coarse adjustment knob is pushed, change driving force to adjust eigenwert one by one, with the raising efficient of jumping onto the tracks.
Another purpose of the present invention provides a kind of method for jumping tracks of CD player, before jumping onto the tracks, according to the executed equidirectional number of times of jumping onto the tracks continuously in the order of homogeneous data search, the eigenwert of corresponding its driving coarse adjustment knob of decision institute, can increase eigenwert fast to promote coarse adjustment knob, drive reaction to quicken coarse adjustment knob.
In order to realize the purpose of foregoing invention, a kind of method for jumping tracks of CD player is provided, comprise the following steps: step (1): the deviation signal value of calculating the relative position deviation of fine adjustment knob and coarse adjustment knob; Step (2): relatively whether deviation signal value is positioned at deviation signal value threshold interval; And step (3): judge that this deviation signal value not when this deviation signal value threshold interval, exports an eigenwert and promote this coarse adjustment knob.
Description of drawings
Fig. 1 is the known optical disc machine synoptic diagram of jumping onto the tracks.
Fig. 2 is the CD player of the present invention synoptic diagram of jumping onto the tracks.
Fig. 3 is the first embodiment of the invention process flow diagram.
Fig. 4 is the second embodiment of the invention process flow diagram.
Fig. 5 is the present invention's first experimental data figure.
Fig. 6 is the present invention's second experimental data figure.
The reference numeral explanation
Embodiment
Technological means and effect thereof that relevant the present invention is adopted for achieving the above object lift preferred embodiment now, and accompanying drawings are as follows.
Please refer to Fig. 2, the CD player of the present invention synoptic diagram of jumping onto the tracks includes: speed command 21, controller 22, thin driving circuit 23, thick driving circuit 24, speed detection unit 25, comparison program unit 26, d.c. motor 27, coarse adjustment knob 28, deviation signal detecting device 281, fine adjustment knob 29 and movable agency 30.Wherein, speed command 21 is assigned the speed that requires fine adjustment knob 29 walkings for system, and in fact speed detection unit 25 for detecting the speed of fine adjustment knob 29 walkings.When fine adjustment knob 29 carries out the speed adjusting, speed command 21 is imported controller 22 with the speed signal of speed detection unit 25, both velocity errors are via controller 22 computings, and output fine setting controlling signal to thin driving circuit 23 drives the operation of jumping onto the tracks that fine adjustment knob 29 carries out the control of speed closed loop.Fine adjustment knob 29 is connected on the movable agency 30 of coarse adjustment knob 38, and fine adjustment knob 29 detects with deviation signal detecting device 281 with the relative displacement of coarse adjustment knob 28.The 281 detected relative displacements of deviation signal detecting device are converted to deviation signal value, and comparison in the input comparison program unit 26 forms the driving signal with result relatively, imports thick driving circuit 24.Allow thick driving circuit 24 drive d.c. motor 27 in good time, d.c. motor 27 promotes coarse adjustment knob 28 again, make coarse adjustment knob 28 can cooperate fine adjustment knob 29 speed to move, and the fine adjustment knob 29 and the deviation signal value of coarse adjustment knob 28 relative displacements are maintained in the deviation signal value threshold interval of being scheduled to.
Please refer to Fig. 3, Fig. 3 is the first embodiment of the invention process flow diagram, the method for jumping tracks of CD player of the present invention, mainly be to utilize to supply with definite value eigenwert driving force, make the fine adjustment knob 28 and the offset deviation signal of coarse adjustment knob 29 be positioned at the offset deviation threshold range, carry out and jump onto the tracks, its method for jumping tracks comprises the following steps:
Step 31: when assigning speed command 21 to controller 22, controller 22 drives thin driving circuit 23, carries out the operation of jumping onto the tracks to drive fine adjustment knob 29;
Step 32: comparison program unit 26 is with thinner regulator 29 and coarse adjustment knob 28 offset deviations, is the deviation signal value that obtains greater than the target offset signal value threshold range upper limit? if, then carry out step 33, if not, then carry out step 34;
Step 33: apply the certain value eigenwert to thick driving circuit 24, eigenwert can be magnitude of voltage or current value, drive d.c. motor 27, transmission coarse adjustment knob 28, impel fine adjustment knob 29 relatively toward coarse adjustment knob 28 central mobile, that is the deviation signal value of impelling fine adjustment knob 29 and coarse adjustment knob 28 offset deviations to obtain falls within the predetermined characteristic value scope, skips to step 37 again and carries out and judge whether coarse adjustment knob 28 skips to target track;
Step 34: whether the deviation signal value that thinner regulator 29 and coarse adjustment knob 28 offset deviations obtain less than target offset signal value threshold range lower limit, if, then carry out step 35, if not, then carry out step 36;
Step 35: apply a reverse definite value eigenwert to thick driving circuit 24, drive d.c. motor 27, transmission coarse adjustment knob 28, impel fine adjustment knob 29 relatively toward coarse adjustment knob 28 central mobile, that is impel fine adjustment knob 29 and coarse adjustment knob 28 offset deviation signal values to fall within the target offset signal value scope, skip to step 37 execution then and judge whether coarse adjustment knob 28 skips to target track;
Step 36: the deviation signal value that obtains when fine adjustment knob 29 and coarse adjustment knob 28 offset deviations falls within the target offset signal value scope, input definite value eigenwert 0, promptly do not drive coarse adjustment knob, allow fine adjustment knob 29 maintain relative coarse adjustment knob 28 paracentral positions;
Step 37: judge whether to skip to target track, if, then carry out step 38, if not, then get back to step 31 after, re-execute the operation of jumping onto the tracks;
Step 38: completing jumping.
Therefore, the method for jumping tracks of the invention described above first embodiment CD player, can be by the offset deviation signal of thinner regulator and coarse adjustment knob, in the time of outside falling within the offset deviation threshold range, that is the relative displacement between fine adjustment knob 29 and coarse adjustment knob 28 is when excessive, drive coarse adjustment knob 28 with fixing certain value eigenwert, fine adjustment knob 29 is maintained between coarse adjustment knob 28 central areas, allow the operation of jumping onto the tracks of fine adjustment knob 29 can not fail the efficient of jumping onto the tracks with raising because being positioned at coarse adjustment knob 28 marginal positions.
Please refer to Fig. 4, Fig. 4 is the method for jumping tracks process flow diagram of second embodiment of the invention CD player, and second embodiment has Fig. 2 functional structure equally, and method is similar with first embodiment basically, but the definite value eigenwert increases one by one or reduce, and its method comprises the following steps.
Step 41: begin to carry out the operation of jumping onto the tracks;
Step 42: detect fine adjustment knob 29 and coarse adjustment knob 28 offset deviation signals;
Step 43: whether compare the deviation signal greater than the target offset signal value threshold range upper limit, if, then carry out step 431, if not, then carry out step 44;
Step 431: whether compare the deviation signal less than preceding deviation signal, if, then carry out step 432, if not, then carry out step 433;
Step 432: because of the deviation signal less than preceding deviation signal, the definite value eigenwert amplitude that expression d.c. motor 27 drives coarse adjustment knob 28 surpasses the offset deviation amplitude that can revise coarse adjustment knob 28 and fine adjustment knob 29, reduce the definite value eigenwert amplitude of default value, skip to step 46 execution then and judge whether to skip to target track;
Step 433: the definite value eigenwert amplitude that d.c. motor 27 drives coarse adjustment knob 28 fails to revise the offset deviation of coarse adjustment knob 28 and fine adjustment knob 29, increases definite value eigenwert amplitude, skips to step 46 execution then and judges whether to skip to target track;
Step 44: whether compare the deviation signal less than predetermined threshold variance signal value lower limit, if, then carry out step 441, if not, then carry out step 45;
Step 441: whether compare the deviation signal greater than the deviation signal of preceding jumping onto the tracks, if, then carry out step 442, if not, then carry out step 443;
Step 442: d.c. motor 27 drives the definite value eigenwert amplitude of coarse adjustment knob 28 above revising the offset deviation of coarse adjustment knob 28 with fine adjustment knob 29 at present, reduce the definite value eigenwert amplitude of default value, skip to step 46 execution then and judge whether to skip to target track;
Step 443: the definite value eigenwert amplitude that d.c. motor 27 drives coarse adjustment knob 28 fails to revise the offset deviation of coarse adjustment knob 28 and fine adjustment knob 29, increases the definite value eigenwert amplitude of default value, skips to step 46 execution then and judges whether to skip to target track;
Step 45: the deviation signal has entered in the deviation signal value threshold range, and input definite value eigenwert 0 does not promptly drive coarse adjustment knob 28;
Step 46: judge whether to skip to target track, if, then carry out step 48, if not, then carry out step 461;
Step 461: will detect the definite value eigenwert amplitude of gained deviation signal and use, and upgrade being recorded as preceding deviation signal and presetting value tag value amplitude respectively, and be back to the deviation signal value that step 42 repeats to judge fine adjustment knob 29 and coarse adjustment knob 28 offset deviations; And
Step 47: completing jumping.
After above-mentioned second embodiment utilizes the input feature vector value to promote coarse adjustment knob, whether detect coarse adjustment knob according to deviation signal lifting situation adjusts to some extent, eigenwert size with decision increase and decrease input, promote coarse adjustment knob, change driving force to adjust eigenwert one by one, fixing definite value eigenwert allow CD player when can't drive coarse adjustment knob 28 smoothly and makes that fine adjustment knob 29 maintains between coarse adjustment knob 28 central areas, increase the eigenwert amplitude gradually, make the efficient relative position scope of accurately keeping coarse adjustment knob 28 and fine adjustment knob 29.
In like manner, in the step 461 of aforementioned second embodiment, remove the definite value eigenwert amplitude that will detect gained deviation signal and use, renewal is recorded as preceding deviation signal and presets outside the value tag value amplitude respectively, still can note down in the order of homogeneous data search, equidirectional definite value eigenwert increases or subtracts number of times, that is according to the performed continuous equidirectional number of times of jumping onto the tracks of homogeneous data search order circulation, then this number of times is multiplied by the definite value eigenwert of a predetermined ratio value, upgrade as presetting the value tag value, for example continuously equidirectional jumping onto the tracks the 3rd time the time, suppose that ratio value is preset as 25%, the number of times 3 of jumping onto the tracks is multiplied by ratio value 25%, then in the initial definite value eigenwert of jumping onto the tracks for the 3rd time, increasing signature amplitude is 75%, to drive coarse adjustment knob 28, quicken the correction situation of coarse adjustment knob 28 and fine adjustment knob 29 offset deviations, drive reaction to quicken coarse adjustment knob.
Following two experimental datas are the method for jumping tracks embodiment at CD player of the present invention, drive the experimental data figure of coarse adjustment knob with magnitude of voltage.Can see in the present invention's first experimental data figure by Fig. 5 that when calculating magnitude of voltage that fine adjustment knob 29 and coarse adjustment knob 28 offset deviations obtain and fall within outside the threshold voltage ranges, input voltage forces magnitude of voltage to be got back in the threshold voltage ranges.As shown in FIG., see second waveform 51,, import three negative voltages 5141,5151,5161 (seeing the 4th waveform 53), make voltage get back in the threshold voltage ranges when voltage 514,515,516 during less than voltage threshold lower limit 512.Then, when voltage 517,518 was higher than the voltage threshold upper limit 511, input secondary positive voltage 5171,5181 made voltage get back in the threshold voltage ranges; The effect that reflects above-mentioned first embodiment.
From the present invention's second experimental data figure of Fig. 6, can see, referring to the 4th waveform 61, jump onto the tracks 611 the time when the number of times of jumping onto the tracks is primary, the power of input voltage 6111 is not enough, and the magnitude of voltage that causes fine adjustment knob 29 and coarse adjustment knob 28 offset deviations to obtain falls within outside the threshold voltage ranges.Jump onto the tracks 612 the time when the second time of carrying out the order of homogeneous data search is equidirectional, increase the initial driving voltage 6121 of coarse adjustment knob.Therefore, coarse adjustment knob 28 just falls within the threshold voltage ranges with the magnitude of voltage that fine adjustment knob 29 offset deviations obtain.
Therefore, utilize the resulting deviation signal of thinner regulator and coarse adjustment knob relative position, can keep accurately in the relative position scope that fine adjustment knob is in coarse adjustment knob, guarantee that read head jumps onto the tracks successfully, to promote CD player usefulness.The driving circuit that drives coarse adjustment knob is simultaneously exported the definite value eigenwert of keeping in the relative position scope that fine adjustment knob is in coarse adjustment knob, can be regulated according to jump onto the tracks number of times and deviation signal correction situation, and then be promoted the degree of stability of the CD player mechanism of jumping onto the tracks.
The above person only is that scope of the present invention is not limited to described preferred embodiment, and is all according to any change that the present invention did, and under the premise of without departing from the spirit of the present invention, all belongs to the scope of the present patent application patent in order to convenient explanation preferred embodiment of the present invention.
Claims (13)
1. the method for jumping tracks of a CD player comprises the following steps:
Step (1) detects a deviation signal value of a fine adjustment knob position and a coarse adjustment knob position relative deviation;
Whether step (2) relatively this deviation signal value is positioned at a deviation signal value threshold interval;
Step (3) judges that this deviation signal value not when this deviation signal value threshold interval, exports an eigenwert and promote this coarse adjustment knob, makes this deviation signal value threshold interval of this deviation signal value migration; And
Step (4) skips to target track, and judges whether to skip to target track, if, then finish to jump onto the tracks, if not, the deviation signal value that detects again of repeating step (1) then.
2. the method for jumping tracks of a kind of CD player as claimed in claim 1,
Wherein this deviation signal value of step (1) is detected by a deviation signal detecting device.
3. the method for jumping tracks of a kind of CD player as claimed in claim 1,
Wherein step (3) is judged this deviation signal value above prescribing a time limit on this deviation signal value threshold interval, and output certain value eigenwert promotes this coarse adjustment knob.
4. the method for jumping tracks of a kind of CD player as claimed in claim 1,
Wherein step (3) judges that this deviation signal value is lower than under this deviation signal value threshold interval in limited time, and output one reverse definite value eigenwert promotes this coarse adjustment knob.
5. the method for jumping tracks of a kind of CD player as claimed in claim 1, wherein step (4) repeating step (1) preceding also comprise step (4-1) upgrade before deviation signal and definite value eigenwert amplitude.
6. the method for jumping tracks of a kind of CD player as claimed in claim 5, wherein step (4-1) be this time jumped onto the tracks the definite value eigenwert amplitude that detects gained deviation signal and use be updated to respectively before deviation signal and definite value eigenwert amplitude.
7. the method for jumping tracks of a kind of CD player as claimed in claim 5, comprise also after step (3) that wherein step (3-1) is by comparing deviation signal and preceding deviation signal, judge whether the certain value eigenwert amplitude that drives revises the offset deviation of this coarse adjustment knob and this fine adjustment knob, if, then reduce this definite value eigenwert amplitude, if not, then increase this definite value eigenwert amplitude.
8. the method for jumping tracks of a kind of CD player as claimed in claim 7, wherein this increase or to reduce definite value eigenwert amplitude be a fixed number.
9. the method for jumping tracks of a kind of CD player as claimed in claim 5 wherein can write down the equidirectional number of times of jumping onto the tracks continuously in step (4-1).
10. the method for jumping tracks of a kind of CD player as claimed in claim 9 wherein is multiplied by the definite value eigenwert of a predetermined ratio value in step (4-1) with this number of times, upgrades as presetting the value tag value.
11. the method for jumping tracks of a kind of CD player as claimed in claim 10, wherein this ratio value is 25%.
12. the method for jumping tracks of a kind of CD player as claimed in claim 1, wherein this eigenwert is a magnitude of voltage.
13. the method for jumping tracks of a kind of CD player as claimed in claim 1, wherein this eigenwert is a current value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510118743XA CN100454400C (en) | 2005-10-31 | 2005-10-31 | Method for jumping tracks in optical disk drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510118743XA CN100454400C (en) | 2005-10-31 | 2005-10-31 | Method for jumping tracks in optical disk drive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1959819A CN1959819A (en) | 2007-05-09 |
| CN100454400C true CN100454400C (en) | 2009-01-21 |
Family
ID=38071477
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200510118743XA Expired - Fee Related CN100454400C (en) | 2005-10-31 | 2005-10-31 | Method for jumping tracks in optical disk drive |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100454400C (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0562212A (en) * | 1991-09-04 | 1993-03-12 | Oki Electric Ind Co Ltd | Optical information recording and reproducing device |
| JPH05234110A (en) * | 1992-02-25 | 1993-09-10 | Nikon Corp | Automatic focus offset adjusting device |
| CN1337678A (en) * | 2000-08-07 | 2002-02-27 | 建兴电子科技股份有限公司 | Optical head track seeking method for CD drive |
| US20020060960A1 (en) * | 2000-10-25 | 2002-05-23 | Toshikazu Kobayashi | Focus control apparatus and focus control method |
| JP2003085792A (en) * | 2001-09-14 | 2003-03-20 | Pulstec Industrial Co Ltd | Adjustment method and adjustment device for optical pickup |
-
2005
- 2005-10-31 CN CNB200510118743XA patent/CN100454400C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0562212A (en) * | 1991-09-04 | 1993-03-12 | Oki Electric Ind Co Ltd | Optical information recording and reproducing device |
| JPH05234110A (en) * | 1992-02-25 | 1993-09-10 | Nikon Corp | Automatic focus offset adjusting device |
| CN1337678A (en) * | 2000-08-07 | 2002-02-27 | 建兴电子科技股份有限公司 | Optical head track seeking method for CD drive |
| US20020060960A1 (en) * | 2000-10-25 | 2002-05-23 | Toshikazu Kobayashi | Focus control apparatus and focus control method |
| JP2003085792A (en) * | 2001-09-14 | 2003-03-20 | Pulstec Industrial Co Ltd | Adjustment method and adjustment device for optical pickup |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1959819A (en) | 2007-05-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0408392B1 (en) | Optical disk recording and reproducing apparatus | |
| KR970003064A (en) | How to adjust disk drive and tilt | |
| CN1142545C (en) | Optical recording/reproducing apparatus | |
| CN100454400C (en) | Method for jumping tracks in optical disk drive | |
| US6606283B2 (en) | Long seeking method used in an optical disk drive | |
| US7149157B2 (en) | Method and apparatus to control a step motor of an optical disk driving system | |
| US5255253A (en) | Apparatus and method for controlling the velocity of a disk storage head | |
| US4930114A (en) | Track jump operation control apparatus in a disk player | |
| US7619849B2 (en) | Magnetic disk drive with controlled transducer movement during a seek | |
| CN100573677C (en) | Auxiliary track-skipping method of disk unit | |
| US7177238B2 (en) | Method and related apparatus for adapting rotation speed adjustments of a motor via a pause mode while accessing data from an optical disc | |
| US20030112720A1 (en) | Method of layer jump braking control for an optical drive | |
| JP2003006884A (en) | Control system and method of long seek in optical disc drive | |
| CN101073112B (en) | Device and method for use in optical record carrier systems | |
| CN1392544A (en) | Control system and method for long distance tracking for CD machine | |
| US7652958B2 (en) | Track locking method for optical pickup head | |
| US20050058045A1 (en) | Method of controlling a sled motor control signal | |
| JPH0727413B2 (en) | Actuator access control device | |
| CN1178215C (en) | Method for quickly regulating focusing error signal level of optical disc drive | |
| CN1941115A (en) | Device and method for correcting focus by converging search mechanism | |
| US20050068856A1 (en) | Method of on-line adjusting a sled motor control signal (FMO) | |
| CN1312683C (en) | CD-ROM drive mirror plane signal automatic regulating apparatus and method | |
| CN100373473C (en) | Optical disc controller | |
| JPS607659A (en) | Magnetic disc device | |
| JPH02179975A (en) | Disk device access method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090121 Termination date: 20121031 |