CN100375999C - CD driver refocusing servo method - Google Patents
CD driver refocusing servo method Download PDFInfo
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- CN100375999C CN100375999C CNB2005100821019A CN200510082101A CN100375999C CN 100375999 C CN100375999 C CN 100375999C CN B2005100821019 A CNB2005100821019 A CN B2005100821019A CN 200510082101 A CN200510082101 A CN 200510082101A CN 100375999 C CN100375999 C CN 100375999C
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- data layer
- object lens
- target data
- focus
- refocusing
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Abstract
A method of the CD-ROM drive focusing servo, firstly, affirms that the non-focusing state when the CD-ROM drive can not receive the effective focusing error signal; then affirms whether the non-focusing state exceeds the predetermined time, keeping the original operation when it does not exceeds the predetermined time, focusing again when it exceeds the predetermined time; fixing the objective lens to affirm the location of the objective lens; And then, judging the layer of the target focusing data; moving the objective lens once to the target data layer, making the focus point approach the target data layer; finally doing focusing servo for the target data layer, refocusing to shorten the time of refocusing, raising the efficacy of the CD-ROM drive.
Description
Technical field
The present invention relates to a kind of CD driver refocusing servo method, particularly a kind of CD-ROM drive that uses the multi data layer dish is losing the servo method that burnt state fast restore focuses to target data layer.
Background technology
General dish is to coat a reflection horizon on substrate, and on the reflection horizon, form the mark of different light reflectivities, (Pit) or the phase change of for example digging pit (Phase Change) etc. are as data Layer, allow the laser beam of CD-ROM drive projection produce different reflection light quantities, after CD-ROM drive receives, convert relative data-signal to.In order to improve the memory capacity of dish, the dish that has is at present coated the translucent reflective data layer of multilayer, the capacity that every increase one deck can double, and DVD-dual layer dish for example commonly used, the capacity of one deck has the 4.7G bit capacity approximately, and two-layer just have a 9.4G capacity.Yet multi data layer increases the servo degree of difficulty of CD ROM focus relatively, and high data storage capacity also need conversion be searched desired data and spend long actuation time between multi data layer simultaneously.
As shown in Figure 1, existing CD-ROM drive is by laser diode (Laser Diode) 1 projection one light beam 2, pass light separator (Beam Spliter) 3, be focused on the dish 5 via object lens (0bjective Lens) 4, this dish 5 is an example to have the Double Data layer, near the object lens person is 0 layer, person far away is 1 layer, object lens 4 then are carried in the actuator (Actutor) 6, move by actuator 6 and to adjust object lens 4 and the distance (among the figure be example with the height direction) of coiling 5, the focus of light beam 2 is incident upon on the target data layer, by this data Layer light beam is followed the original optical path footpath, through object lens 4 to light separator 3, by light separator 3 with beam reflection to light energy converter (Transducer) 7, light energy converter 7 can be for example photoelectric cell etc., light energy converter 7 converts electric signal output to according to reflection light quantity, and form a focus error signal (Focusing ErrorSignal, FE), transfer to focusing servo unit (FocUSing Servo Unit) 8, by focusing servo unit 8 control actuators 6, adjust the height of object lens 4, make the focus point of light beam 2 pin target data layer in the rolling disc, with reading of data.
Yet, in the CD-ROM drive servo action, can be subjected to the bump of various external force unavoidably, especially portable equipment often causes losing Jiao, must focus on the work of homing action to continue and to interrupt again.As shown in Figure 2, show existing CD-ROM drive in focusing process again, the shift position of focus point relative data layer.Wherein, existing CD-ROM drive is losing Jiao above after the schedule time, with the action that focuses on again automatically, shown in arrow among the figure, at first actuator 6 can be with object lens 4 playback, just object lens 4 are reduced to minimum position, the object lens 4 that raise are gradually again sought focus error signal, carry out 0 layer focus servo, read the address date of focal track then, compare with data address before interrupting, as at 0 layer then with the servo arrival target rail of jumping onto the tracks, otherwise not at same one deck, shown in arrow among the figure, actuator 6 carries out skip floor with regard to the object lens 4 that raise again, enters 1 layer focus servo.This kind be the method for focusing again of skip floor, focus servo, comparison successively, can not arrive target data layer rapidly, wastes many unnecessary actuation times undoubtedly, increases the stand-by period that focuses on again, reduces the usefulness of CD-ROM drive.Therefore, existing CD-ROM drive method of focusing again still has problem to exist, and solution co-pending is arranged.
Summary of the invention
Purpose of the present invention is providing a kind of CD driver refocusing servo method, by confirm target data layer in advance, Objective rallying point is directly shifted near target data layer, again focus on again, make focus point arrive target data layer fast, again focus on institute's time spent to shorten, improve the usefulness of CD-ROM drive.
Another object of the present invention is providing a kind of CD driver refocusing servo method, utilize the limit of object lens upper and lower displacement, can reach the position that object lens shift near target data layer rapidly, focus on again double-deck data Layer, again focus on institute's time spent to shorten, improve the usefulness of CD-ROM drive.
In order to reach the purpose of aforementioned invention, CD driver refocusing servo method of the present invention, its step is for confirming that at first CD-ROM drive is at the burnt state of the mistake that can't obtain effective focus error signal; Confirm to lose burnt state again and whether surpass the schedule time,, then begin to focus on again when surpassing the schedule time when then not keeping original running above the schedule time; Position with object lens positioning confirmation object lens place; Judge then and focus on the target data number of plies; Then object lens are once moved to target data layer, its focus point is moved near target data layer; Carry out the target data layer focus servo at last, finish again focusing on.
Description of drawings
Fig. 1 is the existing servo synoptic diagram of CD ROM focus.
Fig. 2 is the synoptic diagram of the shift position of the servo middle Objective rallying point relative data layer of existing CD ROM focus.
Fig. 3 is the process flow diagram of the CD driver refocusing servo method of first embodiment of the invention.
Fig. 4 is the synoptic diagram of the shift position of the servo middle Objective rallying point relative data layer of first embodiment of the invention CD ROM focus.
Fig. 5 is the process flow diagram of the CD driver refocusing servo method of second embodiment of the invention.
The reference numeral explanation
| The 1-laser diode | The 2-light beam |
| The 3-light separator | The 4-object lens |
| The 5-dish | The 6-actuator |
| The 7-light energy converter | The 8-focusing servo unit |
| First embodiment | |
| 10-confirms to lose the step of burnt state | 11-confirms to surpass the step of the schedule time |
| 12-keeps the step of original state | The step that 13-begins to focus on again |
| 14-object lens positioning step | 15-judges the step that focuses on 0 data Layer |
| The step of the focus servo of 16-0 data Layer | 17-finishes the step of focusing |
| The step of the focus servo of 18-1 data Layer | |
| Second embodiment | |
| 20-confirms to lose the step of |
21 confirm to surpass the step of the schedule time |
| 22-keeps the step of original state | The step that 23 beginnings focus on again |
| 24-object |
25 judge the step that focuses on target data layer |
| 26-once shifts near the step of target data layer | 27-target data layer focus servo step |
| 28-finishes the step of focusing | |
| The FE-focus error signal |
Embodiment
Relevant the present invention is for reaching above-mentioned purpose, and technological means that is adopted and effect thereof are lifted preferred embodiment now, and conjunction with figs. is illustrated as follows.
CD driver refocusing servo method of the present invention is to use in CD-ROM drive and multi data layer dish, and its basic framework can be existing framework as shown in Figure 1, and for ease of explanation, the member that CD-ROM drive of the present invention is identical with Fig. 1 represents with identical piece number, give earlier chat bright.
As shown in Figure 3, operation steps for the CD driver refocusing servo method of first embodiment of the invention, at first by step 10 beginning of confirming to lose burnt state, when light energy converter 7 can't provide effective focus error signal, CD-ROM drive promptly is in the burnt state of mistake and picks up counting, though actuator 6 still can move up and down object lens 4, attempt searching focus error signal, but be subjected to factors such as excessive bump or read head instability because of CD-ROM drive, and can not in time finish focusing, of a specified duration for avoiding the CD-ROM drive normal operation to postpone, therefore surpass step 11 control of the schedule time by affirmation and lose the length of burnt state time, when actuator 6 moves object lens and searches focus error signal in 4 schedule times, then keep CD-ROM drive to continue original action and operate with the step 12 of keeping original state.Otherwise, when actuator 6 moves object lens 4 in the given time, in the time of can't searching focus error signal, just enter the step 13 that beginning focuses on again, in the hope of reaching focusing as early as possible, make CD-ROM drive reduction normal operation.
When beginning focused on again, at first object lens positioning step 14 can position object lens 4 with actuator 6, or for example object lens 4 is reduced to minimum position as the reference point.Then,, obtain the address at this data place, judge the number of data layers at data place before interrupting by data before the interruption of having read to judge the step 15 that focuses on 0 data Layer.As judge that the preceding data of interruption are at 0 data Layer, then enter the step 16 of the focus servo of 0 data Layer, give actuator 6 one trigger voltages (Kickoff Voltage), shift object lens 4 gradually and make focus point near 0 data Layer, seek focus error signal, carry out the focus servo of 0 data Layer.Enter the step 17 of finishing focusing then, read the address date of focal track,, finish again focusing on the servo arrival target rail of jumping onto the tracks.If judge and interrupt preceding data at 1 data Layer, then enter the step 18 of the focus servo of 1 data Layer, give actuator 6 big trigger voltages, make actuator 6 by object lens 4 playback place, object lens 4 are once moved to peak, reducing object lens 4 more gradually makes focus point near 1 data Layer, to seek 1 data Layer focus error signal, carry out the focus servo of 1 data Layer, allow object lens 4 focus points be locked in 1 data Layer, enter the step 17 of finishing focusing then, read the address date of focal track, with the servo arrival target rail of jumping onto the tracks, finish focusing on again, the action that continues and interrupt to stablize reading of data.
For showing the characteristics of CD driver refocusing servo method in focusing process again of present embodiment, as shown in Figure 4, with the mobile relevant position of object lens 4 focus point relative data layers, concrete manifestation CD driver refocusing servo method of the present invention.When losing burnt state, CD-ROM drive of the present invention is losing Jiao above after the schedule time, the action that will focus on again.When focusing on again, shown in arrow among the figure, at first actuator 6 can be reduced to minimum position with object lens 4, playbacks.Then, obtain the address of these data, judge the number of plies at data place before interrupting by data before the interruption of having read.If judge and interrupt preceding data at 1 data Layer, then actuator 6 with object lens 4 by playback place, once be increased to the extreme higher position fast, reduce the height of object lens 4 more gradually, make focus point near 1 data Layer, seek 1 data Layer focus error signal, carry out the focus servo of 1 data Layer, allow object lens 4 focus points lock 1 data Layer, focus on to finish again.
Because the servo method that the present invention focuses on again, be to judge the target data layer place that focuses on again in advance, again focus on again, and utilize the limit of object lens upper and lower displacement, allow object lens shift near target data layer rapidly, make the focus point can be fast near target data layer, detect focus error signal as early as possible, carry out the focus servo of target data layer, focus on to finish again, again focus on institute's time spent and can shorten, improve the usefulness of CD-ROM drive.
As shown in Figure 5, be the second embodiment of the invention CD driver refocusing servo method, basically similar in appearance to the operation steps of the CD driver refocusing servo method of first embodiment, equally to confirm to lose step 20 beginning of burnt state, lose the length of burnt state time through confirming step 21 control that surpasses the schedule time, when losing burnt state, keep CD-ROM drive to continue original action with the step 22 of keeping original state and operate above the schedule time.When losing burnt state above the schedule time, just enter the step 23 that beginning focuses on again, object lens positioning step 24 positions object lens 4.Difference be in, only confirm the position at object lens 4 places, and do not reduce to extreme lower position, then with judge the step 25 that focuses on target data layer, judge interrupt before the number of data layers at data place.Enter the step 26 that once shifts near target data layer then, give actuator 6 suitable trigger voltages, make actuator 6 by object lens 4 playback place, object lens 4 are once moved, make focus point near target data layer, target approach data Layer focus servo step 27 again, to seek the target data layer focus error signal, carry out focus servo, finish the step 28 of focusing at last, finish again focusing on, the action that continues and interrupt.
Because the servo method that present embodiment focuses on again, be to confirm the position of object lens and the target data layer place that focuses on again in advance, Objective rallying point is directly once shifted near target data layer fast, make the focus point can be fast near target data layer, carry out the focus servo of target data layer, finish again focusing on rapidly, more can shorten focusing on institute's time spent again, improve the usefulness of CD-ROM drive.
The above person only is that scope of the present invention is not limited to these preferred embodiments, and is all according to any change that the present invention did, and not breaking away under 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 (7)
1. CD driver refocusing servo method, its step comprises:
(1) confirms to be in the servo operation the burnt state of the mistake that can't obtain effective focus error signal;
(2) confirm to lose burnt state and surpass the schedule time,, then begin to focus on again when surpassing the schedule time when then not keeping original running above the schedule time;
(3) position at affirmation object lens place;
(4) judge that the number of data layers of interrupting preceding data place is the focusing target data number of plies;
(5) move to target data layer; And
(6) seek focus error signal in target data layer, carry out the focus servo of data Layer.
2. CD driver refocusing servo method according to claim 1, wherein, the position at this affirmation object lens place is for to be reduced to minimum position with object lens.
3. CD driver refocusing servo method according to claim 1, wherein, it is by data before the interruption of having read that this judgement focuses on the target data number of plies, obtains the address at this data place, to judge the number of data layers of interrupting preceding data place.
4. CD driver refocusing servo method according to claim 1, wherein, this step that moves to target data layer is that object lens are once moved, and makes its focus point near target data layer.
5. CD driver refocusing servo method according to claim 1, wherein, this data Layer is two
Layer is promptly from object lens nearer 0 data Layer and 1 data Layer far away.
6. CD driver refocusing servo method according to claim 5, wherein, this judges that focusing on the target data number of plies focuses on 0 data Layer for judging, as the target data number of plies is 0 data Layer, then object lens are reduced to minimum position, shift object lens more gradually and make focus point near 0 data Layer by the step that moves to target data layer.
7. CD driver refocusing servo method according to claim 6, wherein, this judge to focus on 0 data Layer for not the time, then by the once mobile object lens of the step that moves to target data layer to peak, reduce object lens more gradually and make focus point near 1 data Layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100821019A CN100375999C (en) | 2005-06-29 | 2005-06-29 | CD driver refocusing servo method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100821019A CN100375999C (en) | 2005-06-29 | 2005-06-29 | CD driver refocusing servo method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1889180A CN1889180A (en) | 2007-01-03 |
| CN100375999C true CN100375999C (en) | 2008-03-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100821019A Expired - Fee Related CN100375999C (en) | 2005-06-29 | 2005-06-29 | CD driver refocusing servo method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1151069A (en) * | 1995-09-30 | 1997-06-04 | 三星电子株式会社 | Multi-layered disk focusing method and apparatus |
| JP2002230801A (en) * | 2001-02-02 | 2002-08-16 | Pioneer Electronic Corp | Optical pickup device |
| CN1495728A (en) * | 1997-11-26 | 2004-05-12 | 松下电器产业株式会社 | Focus position regulator and optical disk drive |
| JP2004164846A (en) * | 2003-12-26 | 2004-06-10 | Pioneer Electronic Corp | Focus servo control method and device, information recording device, and information reproducing device |
-
2005
- 2005-06-29 CN CNB2005100821019A patent/CN100375999C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1151069A (en) * | 1995-09-30 | 1997-06-04 | 三星电子株式会社 | Multi-layered disk focusing method and apparatus |
| CN1495728A (en) * | 1997-11-26 | 2004-05-12 | 松下电器产业株式会社 | Focus position regulator and optical disk drive |
| JP2002230801A (en) * | 2001-02-02 | 2002-08-16 | Pioneer Electronic Corp | Optical pickup device |
| JP2004164846A (en) * | 2003-12-26 | 2004-06-10 | Pioneer Electronic Corp | Focus servo control method and device, information recording device, and information reproducing device |
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| Publication number | Publication date |
|---|---|
| CN1889180A (en) | 2007-01-03 |
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