CN1485825A - Correcting method for conducting focus equilibrium - Google Patents
Correcting method for conducting focus equilibrium Download PDFInfo
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- CN1485825A CN1485825A CNA03154312XA CN03154312A CN1485825A CN 1485825 A CN1485825 A CN 1485825A CN A03154312X A CNA03154312X A CN A03154312XA CN 03154312 A CN03154312 A CN 03154312A CN 1485825 A CN1485825 A CN 1485825A
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Abstract
The invention relates to a correction method for proceeding focus balancing which comprises, converting the distance between a read-write head arranged at a predetermined position and a margin disc to produce multiple sets optical output signal to a margin disc, generating by reflection a corresponding multiple sets of optical reflected signal optical reflected signal in respect to a predetermined data stored in the margin disc, receiving and processing the multiple set optical reflected signal, comparing and determining the signal resolution between the multiple set optical reflected signal to make the read-write head move to an optimum focusing position through adjustment.
Description
Technical field
The present invention relates to a kind of bearing calibration that focuses on balance (focus balance), particularly a kind of in the bearing calibration of the enterprising line focusing balance of blank discs.
Background technology
Since at present CD-ROM drive read or replication rate more and more faster, how still can keep good reading or burning quality down running up, be the emphasis place of making great efforts for industry.Wherein, the laser and/write head of CD-ROM drive and the focusing distance between discs, owing to can obviously influence laser projections, belong to have influence on and read or the key factor of burning quality, and this also is concern of the present invention place in the state of discs and from the laser signal of discs reflected back read head.
About the focusing distance between read/write head and discs, see also Fig. 1 (a), Fig. 1 (b), it is respectively the exemplary plot of keeping different focusing distances between read/write head HD and discs D.As for Fig. 1 (c), then be the preferable inner structure exemplary plot of read/write head HD.Wherein a common way is that read/write head HD comprises at least: main read/write head M (having 4 signal receiving areas), and the first side read/write head B1 (having 2 signal receiving areas), and the second side read/write head B2 (also having 2 signal receiving areas) etc.Because read/write head HD has 8 signal receiving areas (to be denoted as A～H) respectively in Fig. 1 (c) altogether, so after the laser optics signal L of read/write head output that HD produces is reflected by discs D, can receive input by 8 signal receiving area A～H, and form 8 fundamental reflection signals and be combined into one group of optical reflection signal.
And the read/write head HD shown in Fig. 1 (a) is assumed to be and sets in advance in focal position P1 place, and the focus point f1 of the laser optics signal L of read/write head output that HD produces, as does not expectedly appear at discs D surface.Thus, because of laser power obviously can't be transferred on the discs D surface fully, not only the intensity of laser optics signal L on discs D can not optimization, after laser optics signal L is by discs D reflection, 8 signal receiving area A～H receive input and the optical reflection signal of formation, and its signal quality is also with bad.Thus, the efficient of not only carrying out burning (or reading) on discs D can not optimization, and can not optimization to the deciphering effect of optical reflection signal.
Relatively, when read/write head HD is adjusted to new focal position P2 shown in Fig. 1 (b), because of the focus point f2 of the laser optics signal L of read/write head output that HD produces just is positioned at discs D surface, laser power obviously can be transferred to discs D fully this moment, make that the efficient of burning/read can optimization.And after laser optics signal L was by discs D reflection, 8 signal receiving area A～H received input and the optical reflection signal of formation, and its signal quality will be good than Fig. 1 (a) those shown also.
Known technology can flexibly maintain an optimum focusing distance by corresponding at any time different platform for making between read/write head HD and discs D, can focus on the corrective action of balance (focus balance) usually.Particularly, its way is to be about to read/write head HD earlier to move to a default focal position, afterwards, carry out several moves in the upper and lower place of default focal position, whether the signal intensity of the optical reflection signal of being imported to judge and forming is clear, so that the focusing distance between read/write head HD and discs D maintains optimum condition.
Just, the aforementioned known corrective action that focuses on balance, be earlier laser projections to discs to be read the discs content material that is stored on the discs (as the music file of music CD or the multimedia file of film VCD or the computer software programs file of software cd), receive the laser light reflected signal again and be treated as the RRF signal or the jutter signal, and then decide best focus position by analyzing RRF signal or jutter signal.That is, read/write head HD receives input and the optical reflection signal that forms will be EFM coding (the Eight to Fourteen Modulation) signal that belongs to radio-frequency stage.In the case, so long as the discs of existing CD content data (as, CD-ROM, DVD-ROM), no matter (for example be by the signal intensity of Direct observation optical reflection signal, the size of peak-to-peak value between comparison signal (peak topeak)), or amount of jitter between measuring-signal (jitter) or error rate all can focus on the corrective action of balance.
When yet in case discs D is blank CD, because read/write head HD can't read any CD content data again, to produce the EFM coded signal, so present known technology promptly can't be beforehand with the corrective action of any focusing balance before formal burning for blank CD.These situations for the CD-ROM drive of high power speed more and more, no matter be to read or burning quality, obviously will descend.
Therefore, propose one of purpose of the present invention, promptly be desirable to provide a kind of bearing calibration that can focus on balance at blank CD.
Summary of the invention
The present invention relates to a kind of bearing calibration that focuses on balance, comprise the following steps: to change blank discs and be positioned at distance between a read/write head of a default focal position, to produce on many group optical output signal to blank discs; Corresponding to a default data stored in the blank discs, produce corresponding many group optical reflection signals with reflection; And import many group optical reflection signals, and relatively judge the clarity of signals of organizing between the optical reflection signals more, so that this read/write head recoverable moves to a best focus position.
According to above-mentioned conception of the present invention, wherein default data be often referred to vendor specific produce sign indicating number, time mark and lock rail mark etc. be made in advance in the blank discs, can be in order to discerning the hiding property information of this blank discs identity, and blank discs is used for what kind of content of store recording (as music, film or computer program) and waits and have nothing to do therewith.
According to above-mentioned conception of the present invention, wherein arbitrary group of optical output signal all can be a laser optics signal.
According to above-mentioned conception of the present invention, wherein read/write head can comprise a plurality of signals receiving area, a plurality of fundamental reflection signals that form by a plurality of signals receiving area receives, arbitrary group of optical reflection signal of one-tenth capable of being combined.
According to above-mentioned conception of the present invention, wherein a plurality of signals receiving area and a plurality of fundamental reflection signal can be respectively 4/8 signal receiving areas and 4/8 fundamental reflection signals.Usually, burning will use 8 receiving areas and 8 fundamental reflection signals, and simple reading only needs to use 4 receiving areas and 4 fundamental reflection signals.
According to above-mentioned conception of the present invention, wherein arbitrary group of optical reflection signal all can be a prerecording ditch groove absolute time (Absolute Time In Pre-groove, ATIP) signal, or be a trace error (TrackingError, TE) signal.
According to above-mentioned conception of the present invention, wherein judge the modes of clarity of signal between many group optical reflection signals, can be directly judge and many group optical reflection signals between signal intensity, use and learn whether read/write head has been proofreaied and correct and move to best focus position.
According to above-mentioned conception of the present invention, can be with the focal position that corresponds to signal intensity the maximum in many group optical reflection signals, as a best focus position; Also can select a bit (for example a bit of middle) as best focus position with the present invention by one section comparatively mild interval of change rate of strength in the formed change in signal strength curve of many groups optical reflection signal.
According to above-mentioned conception of the present invention, wherein judge the mode of clarity of signal between many group optical reflection signals, can be and judge that also often group optical reflection signal is controlled (Auto Gain Control through one in order to the automatic gain that produces fixed gain output, AGC) many groups of gain enlargement ratios that produced during circuit move to best focus position to learn whether read/write head has been proofreaied and correct.At this, can correspond to the focal position of reckling in many group gain enlargement ratios with the present invention, as a best focus position; Also can correspond to by many groups of one section comparatively mild interval of gain enlargement ratio formed gain enlargement ratio change curve moderate multiplying factor rate of change, select a bit (as mid point) and be best focus position in the present invention.
Description of drawings
Fig. 1 (a), Fig. 1 (b): shown in be respectively the exemplary plot of keeping different focusing distances between read/write head and discs.
Fig. 1 (c): a preferable inner structure exemplary plot that is depicted as read/write head among Fig. 1 (a), 1 (b).
Fig. 2 (a): be depicted as the present invention directly with the signal intensity of ATIP optical reflection signal and the relation between focusing distance as a comparison with the exemplifying embodiment figure of criterion.
Fig. 2 (b): the step exemplary plot that is depicted as the first preferable implementing procedure of the present invention.
Fig. 3 (a): be depicted as the present invention with the relation between gain enlargement ratio and focusing distance as a comparison with the exemplifying embodiment figure of criterion.
Fig. 3 (b): the step exemplary plot that is depicted as the second preferable implementing procedure of the present invention.
Wherein, description of reference numerals is as follows:
Fig. 1 (a)～1 (c):
Read/write head HD master read/write head M
The first side read/write head B1, the second side read/write head B2
Signal receiving area A～H
Laser optics signal L discs D
Focal position P1, P2 focus point f1, f2
Fig. 2 (a), 2 (b):
Signal intensity h focusing distance d
Default focal position p0 change in signal strength curve C 1
Focusing distance d21, d22 best focus position d23
Fig. 3 (a), 3 (b):
Gain enlargement ratio a focusing distance d
Default focal position p0 gain enlargement ratio change curve C2
Focusing distance d31, d32 best focus position d33
Embodiment
Because blank CD when dispatching from the factory, wherein all can store some default data in advance, for example, comprise that at least vendor specific production sign indicating number, time mark and lock rail mark etc. are made in the hiding property information in the blank discs in advance.Therefore, one of basic concept of the present invention is promptly intended before the burning blank CD, utilizes read/write head to read these default data in advance, producing some fundamental reflection signals, and and then focus on the correction of balance by these fundamental reflection signals of processing/analysis.
Particularly, for example in conjunction with shown in Fig. 1 (b), 1 (c), after the laser optics signal L of read/write head output that HD produces is reflected by discs D (supposing that it is a blank CD), can receive input by 8 signal receiving area A～H, and form 8 fundamental reflection signals and be combined into one group of optical reflection signal.Wherein, because of the optical reflection signal kinds of deriving and combining, at least can comprise: a prerecording ditch groove absolute time (Absolute Time In Pre-groove, ATIP) signal, an or trace error (Tracking Error, TE) signal or the like, its actual combination and variation will be decided on applicable cases.So the present invention is example to be combined into ATIP optical reflection signal only now, and illustrate as after.Certainly, it must be emphasized that it is that the circuit design of existing read head often is convenient to handle atip signal that the present invention uses one of reason of ATIP, more convenient and cost is lower in the application; But with regard to basic idea of the present invention, so long as read signal that these default data produce can, no matter be 8 original fundamental reflection signals or handle at least two any optical reflection signals that the fundamental reflection signal is produced.
At first, read/write head HD reads the hiding property information that is stored in advance among the blank discs D and produces some fundamental reflection signals, and and then combines ATIP optical reflection signal.Because of it belongs to the low frequency frequency: about 22.05KHz, and its waveform is very stable and clear, so obviously will the very suitable correction that is used for focusing on balance.Certainly, owing to be EFM coding (Eight to Fourteen Modulation) signal that low frequency signal and known technology are to use radio-frequency stage at this moment, therefore corresponding circuit needs slightly modified.Yet, because the reception and the processing of low frequency signal are known technologies, the difficulty that this point not only can not cause the present invention to use can prove that on the contrary the present invention is not obvious, is not to attempt reading blank discs with the hardware structure of known technology can find the present invention easily.Particularly when existence corresponded to the radio-frequency stage EFM coded signal of CD content data, this low frequency signal can be more unclear, thereby be not easy to be detected.
Moreover for the size between the ATIP optical reflection signal of how judging and relatively reading and import in different focal positions place, the present invention proposes two kinds of embodiment, with further announcement concrete application of the present invention.
See also Fig. 2 (a), its be directly with the signal intensity h of ATIP optical reflection signal and the relation between focusing distance d as a comparison with the exemplifying embodiment figure of criterion.That is, earlier read/write head HD is moved to a default focal position p0, afterwards, carry out several again in the upper and lower place of default focal position p0 and move, whether the signal intensity of being imported the optical reflection signal that forms to judge is clear.
Owing to move the read/write head HD many times be positioned at default focal position p0, to produce many group optical output signals to blank CD D, corresponding to above-mentioned default data stored among the blank CD D, can make read/write head HD receive and import the also corresponding corresponding many group ATIP optical reflection signals that produce.The overall signal intensity h of several groups of ATIP optical reflection signals and the change curve between focusing distance d can constitute the C1 curve that is indicated as among Fig. 2 (a).Wherein, in the comparatively mild one section interval of change rate of strength in change in signal strength curve C 1 (promptly indicating between focusing distance d21 and d22 among the figure), can find out a best focus position with the mode of general mathematical operation.For example, will have after the focusing distance d21 of same signal intensity and the d22 addition, or the tangent slope by obtaining change in signal strength curve C 1 can be learnt best focus position d23 near zero point divided by 2.
Certainly, if in change in signal strength curve C 1, can find single focus point really the time, then, be a best focal point in order to produce the corresponding focal position of maximum signal with maximum signal.
Now above-mentioned preferable enforcement notion is organized into the detailed step exemplary plot shown in Fig. 2 (b):
Step (a1): beginning;
Step (b1): move a read/write head that is positioned at a default focal position, to produce on many group optical output signal to blank discs;
Step (c1): stored one default data in the corresponding blank discs produces corresponding many group optical reflection signals with reflection;
Wherein, default data refers to comprise at least that vendor specific production sign indicating number, time mark and lock rail mark etc. are made in the hiding property information in the blank discs in advance; And
Step (d1): the many groups of input optical reflection signal, with the signal intensity between direct judgement and many group optical reflection signals, so that the read/write head recoverable moves to a best focus position;
Wherein, organize the optical reflection signal more and be all a prerecording ditch groove absolute time (Absolute Time InPre-groove, ATIP) signal; Thus, correspond to the focal position of signal intensity the maximum in many group optical reflection signals, be a best focus position; Or for to correspond to by one section comparatively mild interval of change rate of strength in the formed change in signal strength curve of many groups optical reflection signal, best focus position promptly is positioned at this interval;
Step (e1): finish.
About another concrete application of the present invention, please cooperate consult shown in Fig. 3 (a) with the relation between gain enlargement ratio a and focusing distance d as a comparison with the exemplifying embodiment figure of criterion, and be described as follows:
Promptly, owing to move the read/write head HD many times be positioned at default focal position p0, to produce many group optical output signals to blank CD D, corresponding to above-mentioned default data stored among the blank CD D, can make read/write head HD receive and import the also corresponding corresponding many group ATIP optical reflection signals that produce.Generally speaking, organize more ATIP optical reflection signal usually can be again through one be located at automatic gain control circuit in the reading writing head control device (Auto Gain Control, AGC).Therefore, as long as make automatic gain control circuit be in the fixed gain output mode, and by observing the gain enlargement ratio change curve C2 that is constituted by gain enlargement ratio a and focusing distance d, obviously can be in order to judge the signal power of many group ATIP optical reflection signals.That is to say that making the output gain signal of automatic gain control circuit maintain under the prerequisite of a fixed size, the ATIP optical reflection signal of input is strong more, its required gain enlargement ratio is promptly more little.Certainly, because of the circuit structure of reading writing head control device and automatic gain control circuit wherein is all a known technology, so no longer given unnecessary details at this.
Therefore, correspond to the focal position of reckling in many group gain enlargement ratios, be a best focus position.Certainly, as in the many groups of formed gain enlargement ratio of gain enlargement ratio change curve C2, occur to find out a best focus position with the mode of general mathematical operation in one section comparatively mild interval of multiplying power rate of change (promptly indicating between focusing distance d31 and d32 among the figure).For example, will have after the focusing distance d31 of identical gain enlargement ratio and the d32 addition, or the tangent slope by obtaining gain enlargement ratio change curve C2 can be learnt best focus position d33 near zero point divided by 2.
Now above-mentioned preferable enforcement notion is organized into the detailed step exemplary plot shown in Fig. 3 (b):
Step (a2): beginning;
Step (b2): move a read/write head that is positioned at a default focal position, to produce on many group optical output signal to blank discs;
Step (c2): stored one default data in the corresponding blank discs produces corresponding many group optical reflection signals with reflection;
Wherein, default data refers to comprise at least that vendor specific production sign indicating number, time mark and lock rail mark etc. are made in the hiding property information in the blank discs in advance; And
Step (d2): the many groups of input optical reflection signal, judgement is also compared these optical reflection signals and is controlled (Auto Gain Control through one in order to the automatic gain that produces fixed gain output, AGC) the many groups of gain enlargement ratios that circuit produced are so that the read/write head recoverable moves to a best focus position;
Wherein, organize the optical reflection signal more and be all a prerecording ditch groove absolute time (Absolute Time InPre-groove, ATIP) signal; Thus, correspond to the focal position of reckling in many group gain enlargement ratios, be a best focus position, or correspond to by many groups of one section comparatively mild interval of gain enlargement ratio formed gain enlargement ratio change curve moderate multiplying factor rate of change, best focus position promptly is positioned at the interval;
Step (e2): finish.
In sum, the present invention obviously can be under the prerequisite that does not increase cost, focuses on the corrective action of balance at blank CD, with reading or burning quality of effective raising CD-ROM drive.
Claims (10)
1, a kind of bearing calibration that focuses on balance comprises the following steps:
Change a blank CD and be positioned at distance between a read/write head of a default focal position, to produce many group optical output signals to this blank discs;
Corresponding to a default data stored in this blank discs, produce corresponding many group optical reflection signals with reflection; And
Receive to be somebody's turn to do to organize the optical reflection signals more, and relatively judge the clarity of signal between these many group optical reflection signals, so that this read/write head recoverable moves to a best focus position.
2, bearing calibration as claimed in claim 1 is characterized in that, this default data is meant and comprises that at least vendor specific production sign indicating number, time mark and lock rail mark etc. are made in the hiding property information in this blank discs in advance.
3, bearing calibration as claimed in claim 1 is characterized in that, this arbitrary group of optical output signal all can be a laser optics signal.
4, bearing calibration as claimed in claim 1 is characterized in that, this read/write head can comprise a plurality of signals receiving area, a plurality of fundamental reflection signals that form by this a plurality of signals receiving area receives, this arbitrary group of optical reflection signal of one-tenth capable of being combined.
5, bearing calibration as claimed in claim 4 is characterized in that, this a plurality of signals receiving area and these a plurality of fundamental reflection signals can be respectively 4/8 signal receiving areas and 4/8 fundamental reflection signals.
6, bearing calibration as claimed in claim 1, it is characterized in that, judge the mode of clarity of signal between these many group optical reflection signals, can be judge and relatively should many group optical reflection signals through many groups of gain enlargement ratios that produced when producing the automatic gain control circuit of fixed gain output, move to this best focus position to learn whether this read/write head has been proofreaied and correct.
7, bearing calibration as claimed in claim 6 is characterized in that, corresponds to the focal position of reckling in these many group gain enlargement ratios, is a best focus position; Perhaps correspond to by this one section comparatively mild interval of many group gain enlargement ratio formed gain enlargement ratio change curve moderate multiplying factor rate of change, this best focus position promptly is positioned at this interval.
8, bearing calibration as claimed in claim 1 is characterized in that, this arbitrary group of optical reflection signal can be a prerecording ditch groove absolute time signal, or is a trace error signal.
9, bearing calibration as claimed in claim 1, it is characterized in that, judge the mode of clarity of signal between these many group optical reflection signals, can be direct judgement and relatively be somebody's turn to do the signal intensities of organizing between the optical reflection signals more, move to this best focus position to learn whether this read/write head has been proofreaied and correct.
10, bearing calibration as claimed in claim 9 is characterized in that, corresponds to the focal position of signal intensity the maximum in these many group optical reflection signals, is a best focus position; Perhaps correspond to by one section comparatively mild interval of change rate of strength in the formed change in signal strength curve of these many group optical reflection signals, this best focus position promptly is positioned at this interval.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03154312 CN1234117C (en) | 2003-08-15 | 2003-08-15 | Correcting method for conducting focus equilibrium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03154312 CN1234117C (en) | 2003-08-15 | 2003-08-15 | Correcting method for conducting focus equilibrium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1485825A true CN1485825A (en) | 2004-03-31 |
| CN1234117C CN1234117C (en) | 2005-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03154312 Expired - Fee Related CN1234117C (en) | 2003-08-15 | 2003-08-15 | Correcting method for conducting focus equilibrium |
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| Country | Link |
|---|---|
| CN (1) | CN1234117C (en) |
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- 2003-08-15 CN CN 03154312 patent/CN1234117C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1234117C (en) | 2005-12-28 |
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