CN1226725C - Focusing position regulating method and system thereof - Google Patents
Focusing position regulating method and system thereof Download PDFInfo
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- CN1226725C CN1226725C CN 03123097 CN03123097A CN1226725C CN 1226725 C CN1226725 C CN 1226725C CN 03123097 CN03123097 CN 03123097 CN 03123097 A CN03123097 A CN 03123097A CN 1226725 C CN1226725 C CN 1226725C
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Abstract
The present invention provides a method and a system thereof for regulating a focusing position. The present invention is used for regulating the focusing position of an optical read/write device when the optical read/write device reads an optical storing medium provided with a header field and a recordable field; the optical read/write device generates a focusing error signal and uses the focusing error signal to control the focusing condition of an optical read head. In the method, according to the value of the deviation value of the focusing error signal in the header field and the recordable field, the focusing position is regulated behind a tracking close loop of the optical read/write device so that the deviation value is in a preset range. The system comprises a detecting module for a deviation value and a focusing control module, wherein the detecting module for a variance value is used for detecting the deviation value; the focusing control module is used for regulating the focusing position.
Description
Technical field
The invention relates to a kind of focusing position adjusting method and system thereof, be meant a kind of focusing position adjusting method and system thereof that is applied to optical read-write device especially.
Background technology
The conventional optical disc facility have an optical read/write head (optical head), also receive the laser beam of reflection from this discs in order to produce a laser beam on a discs.CD player will correctly read data on the discs, or data are correctly write discs, and CD player all need be carried out focus servo (focusservo) control and rail searching servo (tracking servo) control.Focus servo is the laser beam of control discs that CD player is incident upon, so that laser beam can be gathered in a specific focal position.The traditional focus servocontrol is to finish according to the focus error signal that light beam produced of a reflected light disc (focus error signal).Focus error signal is represented the side-play amount (shift) of this laser beam focal position (focus position) on discs.Can obtain different jitter value (jitter) when focusing on diverse location, jitter value is littler, generally is illustrated in the resulting signal of this focal position more accurately.
Yet traditional focus is servo still to have many problems.First; because the servo control mode of traditional focus is to utilize focus error signal to seek reproducing signal (reproduction signal) maximal value part; or jitter value (jitter) minimum value part; but, therefore usually can make a mistake because both are different for different addresses or its performance value of data area.In addition, because the computation process between focus error signal, jitter value and the focal position is loaded down with trivial details, tries to achieve minimum jitter value and can expend a large amount of time and usefulness.Second, traditional focus is servo to be to be used in one-way spiral track type (SS-L/G) discs, can not carry out distinguishing of platform track (land track) and groove track track (groove track), therefore can't carry out accurate focus control the high density compact disc sheet.The 3rd, traditional focus zero level (zero level) position servo and that reckon without focus error signal may not be best focus position.Just usually make a mistake when reading on the discs data.About the shortcoming of conventional art, details sees also United States Patent (USP) the 6th, 240, No. 055 " focal position adjusting gear and optical disc apparatus " (Focus position adjustment deviceand optical disc drive apparatus).
United States Patent (USP) the 6th, 240, No. 055 disclosed technology is in order to address the above problem.Yet United States Patent (USP) the 6th, 240 still must utilize for No. 055 jitter value minimum value part to seek best focus position, therefore can't effectively accelerate the speed of focus servo.
In addition, United States Patent (USP) the 6th, 240, No. 055 needs one an error rate counter (error rate counter) and a RF signal detector (RF detector), and, just can obtain only focal position via after a complicated algorithm (algorithm) calculating.Thereby many calculation resources and time have been wasted.And concerning blank CD, do not have the so-called reproducing signal can be in order to measuring jitter value, thereby United States Patent (USP) can't be applicable in the blank CD for the 6th, 240, No. 055.
United States Patent (USP) the 6th, 407,968 " optical data with focus error signal compensation reads/transcriber " (Optical information recording/reproducing apparatus having focus errorsignal compensation) utilize to detect a deviate, and according to this deviate compensating focusing error signal, in the hope of a preferable focal position, so United States Patent (USP) the 6th, 407, No. 968 disclosed technology solves the time-consuming problem of focus servo control.
The conventional optical disc machine is reading one when recording the discs of data, when whenever reading the track on the discs, can open the state of (ON state of focus servo) through seeking rail (seek track), lock rail (tracking close loop) and focus servo in regular turn.
Because United States Patent (USP) is for the 6th, 407, No. 968 to detect deviate under the state of focus servo unlatching (ON state offocus servo), has elongated focal position and adjusted the required time.In addition, this deviate is to respond one to seek rail error signal (tracking error signal), need seek rail error signal and focus error signal and desire to obtain deviate, so United States Patent (USP) the 6th, 407, No. 968 disclosed technology has still increased required time.
Summary of the invention
Therefore, fundamental purpose of the present invention is to provide a kind of focusing position adjusting method and system thereof, to solve the problem of conventional art.
A purpose of the present invention provides a kind of focusing position adjusting method and system thereof, the focal position when reading an optics storing media in order to adjust an optical read-write device.
A purpose of the present invention provides a kind of focusing position adjusting method and system thereof, need not utilize a jitter value can adjust this focal position.
According to a specific embodiment of the present invention, has a header area (header) on this optics storing media but and recording areas (recording field).This optical read-write device can produce a focus error signal (focusing error signal), and utilizes this signal to control the focusing situation of optical read head (pickup head).This method is behind this optical read-write device lock rail (tracking close loop), a focus signal level and a reference level according to this focus error signal relatively obtain a deviate (DeviationValue), adjust this focal position so that this deviate in a preset range.This system comprises that a deviate detecting unit is in order to detect this deviate and a focus control unit in order to adjust this focal position.
The present invention can obtain a best focus position by the control deviation value.Whereby, the present invention uses original mechanism in the servocontrol, only increases the computing function of minority, need not increase hardware design, just can avoid loaded down with trivial details jitter value to calculate.Therefore the present invention can save the time that optical read-write device is sought best focus position, and increases its usefulness.
Can be further understood by the following detailed description and accompanying drawings about the advantages and spirit of the present invention.
Description of drawings
Fig. 1 is for using the optical read-write device synoptic diagram of focal position Adjustment System of the present invention.
Fig. 2 A reads platform track (land-track) the hour offset amount of optics storing media and the graph of a relation of jitter value in the embodiment of the invention.
Fig. 2 B reads platform track (land-track) the hour offset amount of optics storing media and the graph of a relation of deviate in the embodiment of the invention.
Fig. 3 A reads groove track (groove-track) the hour offset amount of optics storing media and the graph of a relation of jitter value in the embodiment of the invention.
Fig. 3 B reads groove track (groove-track) the hour offset amount of optics storing media and the graph of a relation of deviate in the embodiment of the invention.
Fig. 4 A is the side-play amount average when reading the optics storing media in the embodiment of the invention and the graph of a relation of jitter value.
Fig. 4 B is the side-play amount average when reading the optics storing media in the embodiment of the invention and the graph of a relation of deviate.
Fig. 5 is the flow chart of steps of invention focusing position adjusting method.
Label declaration
10: optical read-write device 12: the optics storing media
14: optical read/write head 15: servo control unit
16: signal processing unit 18: spindle motor
20: focusing servo unit 22: the rail searching servo unit
24: focal position Adjustment System 26: the deviate detecting unit
28: focus control unit 30: drive unit
Embodiment
See also Fig. 1.Fig. 1 is for using optical read-write device 10 synoptic diagram of focal position Adjustment System of the present invention.Focal position when focal position Adjustment System of the present invention reads an optics storing media 12 in order to adjust an optical read-write device 10.
Optical read-write device 10 comprises an optical read/write head 14 (optical head) and a servo control unit 15 (servo control unit).Optics storing media 12 with rotational speed rotation, makes optical read/write head 14 read or write optics storing media 12 by a spindle motor 18 (spindle motor).Optics storing media 12 is meant a DVD-RAM especially, has a plurality of spiral helicine track records, have at least one header area (header) on it but and recording areas (recording field) in order to the record digital document.When but general optical read-write device 10 read header area and recording areas, its focus error signal (focusing errorsignal) had different level.But the focus signal level of recording areas may be defined as reference level, also can represent the reference position of optical read/write head 14.And the focus signal level of header area and the difference between reference level are represented the difference of this focal position and this reference position, are defined as a deviate (deviationvalue).
Optical read/write head 14 is penetrated this focal position on optics storing media 12 in order to produce a light beam, and is received from a folded light beam of this focal position.When optical read-write device 10 enters a track and desires to read the file data of optics storing media 12, can make optical read/write head 14 these tracks of locking, but then read the header area and the recording areas at rear more earlier through lock rail (track close loop).
Include focal position Adjustment System 24 of the present invention in the servo control unit 15 in addition.Focal position Adjustment System 24 comprises a deviate detecting unit 26 and a focus control unit 28.Deviate detecting unit 26 is measured the deviate (Deviation Value) between header area focus error signal and reference level after being used for optical read-write device 10 lock rails (tracking close loop).Focus control unit 28 in order to adjust this focal position so that this deviate in a preset range.
Deviate detecting unit 26 is to compare according to a signal level of this focus error signal and a reference level, to judge this deviate.This reference level is the level that is produced from this reference position reflex time when this folded light beam.Fiducial value according to this signal level and this reference level can this deviate.Deviate detecting unit 26 detects and judges this signal level and this reference level and obtain the wherein variable quantity of voltage, just can further obtain the deviate of this focal position and this reference position.Focus control unit 28 is according to the difference of this deviate and a preset range, to produce a focus control signal, in order to adjust this focal position so that this deviate in this preset range.
Focal position Adjustment System 24 further comprises a drive unit 30, adjusts this focal position of optical read/write head 14 in order to this focus control signal that is produced according to focus control unit 28.
For DVD-RAM, because but its header area is different with the structure of recording areas, but the therefore focus error signal of optical read/write head 14 in header area and recording areas difference to some extent, this moment, optical read-write device 10 can apply a side-play amount (offset) in optical read/write head 14, to adjust this focal position of optical read/write head 14.
Optical read-write device 10 can produce shake (jitter) value when reading optics storing media 12.When this jitter value is more little, represent optical read-write device 10 to have preferable focal position.And this jitter value has a corresponding relation with this side-play amount that is compelled to apply, and this jitter value can change with the change of this side-play amount.When this side-play amount is in an interval, can correspondingly have preferable jitter value.
Have a corresponding relation between this side-play amount (offset) and this deviate (Deviation Value), when adjusting this deviate and be lower than this particular range, can make this side-play amount in this interval.
See also Fig. 2 A-B, Fig. 3 A-B and Fig. 4 A-B.Fig. 2 A reads platform track (land-track) the hour offset amount of optics storing media and the graph of a relation of jitter value in the embodiment of the invention.Fig. 2 B reads platform track (land-track) the hour offset amount of optics storing media and the graph of a relation of deviate in the embodiment of the invention.Fig. 3 A reads groove track (groove-track) the hour offset amount of optics storing media and the graph of a relation of jitter value in the embodiment of the invention.Fig. 3 B reads groove track (groove-track) the hour offset amount of optics storing media and the graph of a relation of deviate in the embodiment of the invention.Fig. 4 A is the side-play amount average when reading the optics storing media in the embodiment of the invention and the graph of a relation of jitter value.Fig. 4 B is the side-play amount average when reading the optics storing media in the embodiment of the invention and the graph of a relation of deviate.
Shown in Fig. 2 A, when reading the platform track (land-track) of optics storing media 12, when side-play amount was 0mV, jitter value was not a minimum value.When side-play amount was adjusted between the 120mV to 300mV, its corresponding minimum jitter value was about 2%.Therefore when reading the platform track of optics storing media 12, when being controlled at side-play amount between the 120mV to 300mV, can obtain minimum jitter value.Correspond to Fig. 2 B,, can obtain the best focus position of this optical read head as long as deviate is controlled at below the 100mV.
As shown in Figure 3A, when reading the groove track (groove-track) of optics storing media 12, when side-play amount between between the 0mV to 300mV the time, corresponding minimum jitter value is about 2%.Side-play amount is tolerable scope between-100mV to 300mV.See also Fig. 3 B.When reading the groove track of optics storing media 12,, promptly obtain the optimal jitter value as long as deviate is set in 100mV when following.
Shown in Fig. 4 A, between about 120mV to 300mV, be the tolerable scope of jitter value when the mean deviation amount.According to one embodiment of the invention, when optical read-write device reads optics storing media 12, see also Fig. 4 B.When reading the groove track of optics storing media 12, as long as the mean deviation value is set in below the 100mV best focus position in the time of can obtaining reading optics storing media 12.
Compared to conventional art, the present invention uses original mechanism in the servocontrol, only increases the computing function of minority, need not increase hardware design, just can avoid loaded down with trivial details jitter value to calculate.As long as the control deviation value in a suitable interval, can obtain the best focus position that optical read/write head 14 reads optics storing media 12.Not only improved many problems of conventional art, more saved a large amount of optical read heads 14 and sought the time of best focal point, and increased optical read-write device 10 usefulness.
See also Fig. 5, Fig. 5 is the flow chart of steps of focusing position adjusting method of the present invention.Focusing position adjusting method of the present invention comprises the following step:
Step S30: beginning;
Step S32: behind optical read-write device 10 lock rails, read the focus error signal of header area;
Step S34: according to this focal position of focus signal electrical level judging of this focus error signal and the deviate of this reference position;
Step S36: detect deviate;
Step S38: according to the difference of this deviate and this preset range, to produce a focus control signal;
Step S40: adjust this focal position according to this focus control signal, so that this deviate is in a preset range;
Step S42: finish.
The invention provides a kind of focusing position adjusting method and system thereof, the focal position when reading an optics storing media in order to adjust an optical read-write device.This method is behind this optical read-write device lock rail (tracking close loop), according to a focus signal level of header area focus error signal and the deviate (Deviation Value) between reference level, adjust this focal position, so that this deviate is in a preset range.This system comprises that a deviate detecting unit is in order to detect this deviate and a focus control unit in order to adjust this focal position.The present invention can obtain best focus position by this deviate of control.Whereby, the present invention uses original mechanism in the servocontrol, only increases the computing function of minority, need not increase hardware design, just can avoid loaded down with trivial details jitter value to calculate.Therefore the present invention has saved the focal time of a large amount of optical read heads, and increases optical read-write device usefulness.
By the above detailed description of preferred embodiments, be to wish to know more to describe feature of the present invention and spirit, and be not to come category of the present invention is limited with above-mentioned disclosed preferred embodiment.On the contrary, its objective is that hope can contain the present invention that is arranged in of various changes and tool equality.
Claims (13)
1. focal position Adjustment System, focal position when reading an optics storing media in order to adjust an optical read-write device, but have a header area and a recording areas on this optics storing media, but the location definition that described optical read-write device successfully focuses in recording areas is a reference position, the signal that obtains in this position is a reference signal, obtain a focus error signal when this optical read-write device reads this header area, this system comprises:
One deviate detecting unit, be used to this optical read-write device lock rail after, according to the value of this focus error signal in this header area with a deviate of judging this focal position and this reference position; And
One focus control unit, in order to adjust this focal position so that this deviate in a preset range.
2. the system as claimed in claim 1, wherein this deviate detecting unit is to utilize a focus signal level of this focus error signal to compare in a reference level, this focus signal level is this focal position of indication, this reference level is the level that is produced from this reference position reflex time when this folded light beam, and a fiducial value of this focus signal level and this reference level can this deviate.
3. system as claimed in claim 2, wherein this optical read-write device further comprises:
One optical read/write head is penetrated this focal position on this optics storing media in order to produce a light beam, and is received from a folded light beam of this focal position; And
One signal processing unit in order to this folded light beam that this optical read head received is analyzed, and produces this focus error signal.
4. system as claimed in claim 3, wherein this optical read-write device applies a side-play amount in this optical read/write head, to adjust this focal position, has a corresponding relation between this side-play amount and this deviate, by adjusting this deviate within this preset range, can make this side-play amount between this interval.
5. system as claimed in claim 4, wherein this focus control unit is the difference according to this deviate and this preset range, produces a focus control signal.
6. system as claimed in claim 5 further comprises a drive unit, in order to according to this focus control signal to adjust this focal position of this optical read/write head.
7. the system as claimed in claim 1, this optics storing media is a DVD-RAM.
8. focusing position adjusting method, focal position when reading an optics storing media in order to adjust an optical read-write device, but have a header area and a recording areas on this optics storing media, but the location definition that described optical read-write device successfully focuses in recording areas is a reference position, the signal that obtains in this position is a reference signal, can obtain a focus error signal when this optical read-write device reads this header area, this method comprises:
Behind this optical read-write device lock rail, according to the value of the focus error signal in this header area with a deviate of judging this focal position and this reference position; And
Adjust this focal position so that this deviate in a preset range.
9. method as claimed in claim 8, wherein a focus signal level and a reference level of this focus error signal compare, this focus signal level is this focal position of indication, this reference level is the level that is produced from this reference position reflex time when this folded light beam, and a fiducial value of this focus signal level and this reference level is this deviate.
10. method as claimed in claim 9, wherein this optical read-write device further comprises:
One optical read/write head is penetrated this focal position on this optics storing media in order to produce a light beam, and is received from a folded light beam of this focal position; And
One signal processing unit in order to this folded light beam that this optical read head received is analyzed, and produces this focus error signal.
11. method as claimed in claim 10, wherein this optical read-write device applies a side-play amount in this optical read/write head, to adjust this focal position, has a corresponding relation between this side-play amount and this deviate, by adjusting this deviate in this particular range, can make this side-play amount between this interval.
12. method as claimed in claim 11 further comprises the following step:
According to the difference of this deviate and this preset range, to produce a focus control signal.
13. method as claimed in claim 12 further comprises the following step:
According to this focus control signal to adjust this focal position.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03123097 CN1226725C (en) | 2003-04-30 | 2003-04-30 | Focusing position regulating method and system thereof |
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|---|---|---|---|
| CN 03123097 CN1226725C (en) | 2003-04-30 | 2003-04-30 | Focusing position regulating method and system thereof |
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| CN1542771A CN1542771A (en) | 2004-11-03 |
| CN1226725C true CN1226725C (en) | 2005-11-09 |
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| CN 03123097 Expired - Fee Related CN1226725C (en) | 2003-04-30 | 2003-04-30 | Focusing position regulating method and system thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100568355C (en) * | 2002-04-24 | 2009-12-09 | 夏普株式会社 | Pick up the light device |
| CN102543135A (en) * | 2010-12-27 | 2012-07-04 | 广明光电股份有限公司 | Disc label surface contrast compensation method |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8199620B2 (en) * | 2008-08-14 | 2012-06-12 | Mediatek Inc. | Method for performing servo defect compensating operation by compensating servo-related signal derived from reading optical medium and related optical disc drive system with DSP |
| CN103076286B (en) * | 2011-10-26 | 2015-06-24 | 联发科技股份有限公司 | Photoacoustic microscopy (pam) systems and related methods for observing objects |
-
2003
- 2003-04-30 CN CN 03123097 patent/CN1226725C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100568355C (en) * | 2002-04-24 | 2009-12-09 | 夏普株式会社 | Pick up the light device |
| CN102543135A (en) * | 2010-12-27 | 2012-07-04 | 广明光电股份有限公司 | Disc label surface contrast compensation method |
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| Publication number | Publication date |
|---|---|
| CN1542771A (en) | 2004-11-03 |
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