CN102157164B - Focusing position adjusting method and system for optical head - Google Patents
Focusing position adjusting method and system for optical head Download PDFInfo
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- CN102157164B CN102157164B CN201110089683.9A CN201110089683A CN102157164B CN 102157164 B CN102157164 B CN 102157164B CN 201110089683 A CN201110089683 A CN 201110089683A CN 102157164 B CN102157164 B CN 102157164B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 127
- 238000000034 method Methods 0.000 title claims abstract description 53
- 230000005540 biological transmission Effects 0.000 claims description 9
- 230000008672 reprogramming Effects 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 9
- 230000035484 reaction time Effects 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 7
- 238000001514 detection method Methods 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
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Abstract
The invention provides a focusing position adjusting method and a focusing position adjusting system for an optical head. The optical head is positioned at a focusing position which is a certain distance away from an optical recording medium, and is used for transmitting a burning light beam with certain power to the optical recording medium so as to burn corresponding optical data onto the optical recording medium. The method comprises the following steps of: 1) performing burning on the optical recording medium by using the focusing position; 2) stopping burning and reading burnt data with reading power so as to generate a corresponding radio frequency signal; 3) acquiring a vibration amplitude absolute value by using the radio frequency signal; 4) changing the focusing position and repeating the step 1) so as to acquire a maximum vibration amplitude absolute value and a target focusing position corresponding to the maximum vibration amplitude absolute value; and 5) adjusting the optical head to the target focusing position so that the optical head can successively perform burning at the target focusing position on the optical recording medium, wherein the vibration amplitude absolute value is an I14/I14H modulation value.
Description
The application is to be on March 31st, 2009 applying date, and application number is 200910129181.7, and what denomination of invention was the application of " focusing position adjusting method of optical head and system thereof " divides an application.
Technical field
The present invention relates to a kind of method of adjustment and system of focusing position of optical head, especially refer to a kind of method of adjustment and system of the focusing position of optical head for optical recording/read-write equipment.
Background technology
In prior art, on optical record medium, during burning data, optical head is used the focal position of this focusing error zero crossing to carry out burning.Yet disc, because processing procedure is unstable, usually has and tilts or rugged problem, therefore, this predetermined focal position not one is decided to be best focal position.Best focus position can change in the process of burning.And optical head potential range optical record medium too closely or too far away, the optical record medium quality that causes the burning of this record/read-write equipment institute to go out is unstable, and then impact carries out from this optical record medium the quality that data read.
Refer to Fig. 1 and be optical head when a specific focusing, in the process by information burning on optical record medium, burning radio-frequency signal changes schematic diagram.First, when optical head starts to send burning light beam, sensing module can produce corresponding burning radio-frequency signal, i.e. A benchmark; Subsequently, when burning light beam sent after a period of time, sensor just can produce a comparatively stable burning radio-frequency signal, i.e. B benchmark; And when optical head interrupts sending burning light beam and gets back to readout power, sensing module can be the voltage of a lower benchmark from this higher stable burning radio-frequency signal saltus step, i.e. C benchmark.And existing optical head focusing regulation method all adopts the corresponding focal position of B benchmark as target focal position, yet, in actual applications, from A benchmark to needs through a relatively unsettled stage, just can reach B benchmark, so often obtaining of this B benchmark is difficult for accurately.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of method of adjustment of focusing position of optical head, in order in the process of burning, adjust the focal position of optical head, effectively to solve the unsettled problem of known burning quality.
Focusing position adjusting method provided by the present invention be utilize burning radio-frequency signal from the saltus step of B benchmark for C benchmark is as detection reference, when burning radio-frequency signal being detected and transfer low reference voltage to from high reference voltage, obtain voltage minimum and the corresponding target focal position thereof of burning radio-frequency signal, the focal position of further adjusting optical head is this target focal position, effectively to solve the unsettled problem of known burning quality.
Based on above-mentioned design, the present invention proposes a kind of focusing position adjusting method of optical head, this optical head is positioned at and the focal position of an optical record medium at a distance of a preset distance, in order to this optical record medium is sent to the burning light beam of a predetermined power, and by corresponding optical data burning on this optical record medium, this focusing position adjusting method comprises:
1) with a focal position, on this optical record medium, carry out burning, to produce a corresponding burning radio-frequency signal;
2) detect this burning radio-frequency signal and whether by a high reference voltage, transfer low reference voltage to, if so, enter 3);
3) obtain the voltage minimum of this burning radio-frequency signal, with and corresponding target focal position;
4) by this adjusting of optical pickup to this target focal position so that this optical head is follow-up, can to this optical record medium, carry out burning in this target focal position;
Wherein, described high reference voltage refers to that burning light beam sent after a period of time, the high reference voltage of burning radio-frequency signal when comparatively stablizing; Described low reference voltage refers to, when optical head interrupts sending burning light beam and gets back to readout power, and the voltage of the low benchmark that burning radio-frequency signal obtains from described high reference voltage generation saltus step.
In order to realize the focusing position adjusting method of above-mentioned optical head, the present invention also proposes a kind of adjustment System of focusing position of optical head, comprising:
Sensing module, for sense the burning light beam reflecting on this optical record medium, and produces corresponding burning radio-frequency signal;
Control module, comprising: a change unit, position, and with preposition reprogramming, control this optical head change and on this optical record medium, carry out the focal position of burning; Current potential conversion detecting unit, for exporting a switching signal when detecting when burning radio-frequency signal that described sensing module produces transfers low reference voltage to by high reference voltage; Described high reference voltage refers to that burning light beam sent after a period of time, the high reference voltage of burning burning radio-frequency signal when comparatively stablizing; Described low reference voltage refers to, when optical head interrupts sending burning light beam and gets back to readout power, and the voltage of the low benchmark that burning radio-frequency signal obtains from described high reference voltage generation saltus step; Extreme value generation unit, for obtain the wherein voltage minimum of burning radio-frequency signal according to described switching signal, and corresponding target focal position.
Transmission module, according to the control of described control module, by this adjusting of optical pickup to this target focal position.
The present invention also proposes the focusing position adjusting method of another kind of optical head, this optical head is positioned at and the focal position of an optical record medium at a distance of a preset distance, in order to this optical record medium is sent to the burning light beam of a predetermined power, and by corresponding optical data burning on this optical record medium, this focusing position adjusting method comprises:
1) with a focal position, on this optical record medium, carry out burning;
2) suspend burning, with the data of readout power retaking of a year or grade burning, to produce a corresponding burning radio-frequency signal;
3) utilize this burning radio-frequency signal, obtain absolute value of amplitude;
4) change this focal position, and repeat to enter step 1), with obtain a peak swing absolute value with and corresponding target focal position;
5) by this adjusting of optical pickup to this target focal position so that this optical head is follow-up, can to this optical record medium, carry out burning in this target focal position.
In order to realize the focusing position adjusting method of above-mentioned another kind of optical head, the present invention also proposes a kind of adjustment System of focusing position of optical head, comprising:
Sensing module, for sense the burning light beam reflecting on this optical record medium, and produces corresponding burning radio-frequency signal;
Control module, comprising: a change unit, position, and with preposition reprogramming, control this optical head change and on this optical record medium, carry out the focal position of burning; Retaking of a year or grade detecting unit, for to suspending burning after burning, then detects to obtain an absolute value of amplitude to the burning radio-frequency signal of the corresponding generation of the data of retaking of a year or grade burning institute; Magnitude determinations unit, for receiving this absolute value of amplitude, and relatively produces a peak swing absolute value, and corresponding target focal position.
Transmission module, according to the control of described control module, by this adjusting of optical pickup to this target focal position.
Adopt the advantage of said method and system for continuing to adjust focal position according to the undershoot magnitude of voltage of burning radio-frequency signal or absolute value of amplitude during burning, make whole disc have from the inside to the outside consistent burning quality.Or, according to the focal position of a plurality of points of disc, adjust result, determine the target focal position of optional position.
For above and other object of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly, and coordinate appended diagram, be described in detail below.
Accompanying drawing explanation
Fig. 1 is that the burning radio-frequency signal of optical read head in prior art changes schematic diagram.
Fig. 2 A is the oscillogram of the burning radio-frequency signal (Write RF) that illustrates according to first embodiment of the invention.
Fig. 2 B is the focusing position adjusting method process flow diagram of the optical head that illustrates according to first embodiment of the invention.
Fig. 2 C is the focal position adjustment System block scheme of a kind of optical head of illustrating according to first embodiment of the invention.
Fig. 3 A is the oscillogram of the burning radio-frequency signal (Write RF) that illustrates according to second embodiment of the invention.
Fig. 3 B is the focusing position adjusting method process flow diagram of the optical head that illustrates according to second embodiment of the invention.
Fig. 3 C is the focal position adjustment System block scheme of a kind of optical head of illustrating according to second embodiment of the invention.
Fig. 4 A is the oscillogram of the radiofrequency signal (RF Signal) that illustrates according to third embodiment of the invention.
Fig. 4 B is the focusing position adjusting method process flow diagram of the optical head that illustrates according to third embodiment of the invention.
Fig. 4 C is the focal position adjustment System block scheme of a kind of optical head of illustrating according to third embodiment of the invention.
Embodiment
Fig. 2 A is the oscillogram of the burning radio-frequency signal (Write RadioFrequency Signal, Write RF) that illustrates according to first embodiment of the invention.Please refer to Fig. 2 A, this waveform is during burning, when the Writing power of optical read head (Write Power) is fixed to readout power (Read Power), in order to produce the oscillogram of blank (Space) block on disc, in optical disc, burning radio-frequency signal is defined as follows:
Write?RF＝Write?Power×R
Wherein, R is reflectivity.Because optical head now produces blank (Space) block with laser head on disc with readout power, and readout power is relatively low, and during this period, power is fixed.Therefore,, when the focusing of optical head is better, (Undershoot Voltage) is lower for the undershoot magnitude of voltage of waveform.Next, Fig. 2 B is the process flow diagram of the focusing position adjusting method that illustrates according to first embodiment of the invention.Please refer to Fig. 2 A and Fig. 2 B, in this embodiment, the method for adjusting focusing position of optical head is as follows:
Step S201: start burning;
Step S202: change the focal position of optical head in burning process, to produce corresponding burning radio-frequency signal (Write RF);
Step S203: judge that whether above-mentioned burning radio-frequency signal (Write RF) turns low-voltage level by a high voltage level, when being judged as YES, carries out step S204; When being judged as NO, continue to carry out step S203;
Step S204: obtain the minimal value Vsc of above-mentioned burning radio-frequency signal (Write RF), with and a corresponding target focal position;
Step S205: adjusting of optical pickup, to above-mentioned target focal position, can be carried out to burning to optical record medium at this target focal position so that optical head is follow-up.
Corresponding to the method for embodiment mono-, the present invention also provides a kind of burning radio-frequency signal minimum value adjustment System of focal position of optical head, with reference to figure 2C, comprises sensing module 21, control module 22 and transmission module 23, wherein:
Sensing module 21, for sense the burning light beam reflecting on this optical record medium, and produces corresponding radiofrequency signal;
Control module 22, comprising: a current potential conversion detecting unit 221, one first storage unit 222, an extreme value generation unit 223 and a change unit, position 224, wherein:
Current potential conversion detecting unit 221, for exporting a switching signal when detecting when radiofrequency signal that described sensing module 21 produces transfers low reference voltage to by high reference voltage;
The first storage unit 222, for when receiving the switching signal of described current potential conversion detecting unit 221 outputs, records the magnitude of voltage of current burning radio-frequency signal;
Extreme value generation unit 223, for receiving this magnitude of voltage from the first storage unit 222, and relatively produces the corresponding minimum voltage value of minimum value of this radiofrequency signal and corresponding target focal position thereof;
Change unit, position 224, with preposition reprogramming, controls this optical head change and on this optical record medium, carries out the focal position of burning;
Transmission module 23, according to the control of control module 22, by this adjusting of optical pickup to the corresponding target focal position of described minimum voltage value.
Wherein, described radiofrequency signal is the burning radio-frequency signal producing in burning process.
Fig. 3 A is the oscillogram of the burning radio-frequency signal (Write RF) that illustrates according to second embodiment of the invention.Please refer to Fig. 3 A, the embodiment of above-mentioned Fig. 2 is the minimal value voltage that detects burning radio-frequency signal (Write RF), and the minimum value of undershoot voltage is namely used as adjusting the basis of focusing position of optical head.Fig. 3 B is the process flow diagram of the focusing position adjusting method that illustrates according to second embodiment of the invention.Please refer to Fig. 3 A and Fig. 3 B, in this example, given tacit consent to one group of reference voltage V
ref.And above-mentioned step can be as following variation:
Step S301: start burning;
Step S302: change the focal position of optical head in burning process, to produce corresponding burning radio-frequency signal (Write RF);
Step S303: judge that whether above-mentioned burning radio-frequency signal (Write RF) turns low-voltage level by a high voltage level, when being judged as YES, carries out step S304; When being judged as otherwise continue to carry out step S303;
Step S304: when burning radio-frequency signal turns low-voltage level by a high voltage level, start timing;
Step S305: judge whether burning radio-frequency signal arrives a predetermined voltage V
refif burning radio-frequency signal not yet arrives predetermined voltage V
ref, maintain step S304, continue timing; If burning radio-frequency signal arrives predetermined voltage V
ref, carry out step S306;
Step S306: when burning radio-frequency signal arrives predetermined voltage V by a relative low-voltage
reftime, stop timing, obtain a undershoot reaction time (Undershoot Response Time) t
a～t
c;
Step S307: repeat above-mentioned steps S303～step S306, to obtain a maximum undershoot reaction time t
cwith and corresponding target focal position;
Step S308: adjusting of optical pickup, to above-mentioned target focal position, can be carried out to burning to optical record medium at this target focal position so that optical head is follow-up.
Because this kind of mode can at once be learnt focusing situation in burning, therefore can be in ensuing burning, suitable adjustment focal position, promotes the quality of burning.
Corresponding to the method for embodiment bis-, the present invention also provides a kind of maximum undershoot reaction time adjustment System of focal position of optical head, with reference to figure 3C, comprises sensing module 31, control module 32 and transmission module 33, wherein:
Sensing module 31, for sense the burning light beam reflecting on this optical record medium, and produces corresponding radiofrequency signal;
Control module 32, comprising: a current potential conversion detecting unit 321, a timing unit 322, an extreme value generation unit 323 and a change unit, position 324, wherein:
Current potential conversion detecting unit 321, for exporting a switching signal when detecting when radiofrequency signal that described sensing module 31 produces transfers low reference voltage to by high reference voltage;
Timing unit 322, for when receiving the switching signal of described current potential conversion detecting unit 321 outputs, starts timing, when described burning radio-frequency signal arrives a predetermined voltage by a relative low-voltage, stops timing, to obtain the undershoot reaction time;
Extreme value generation unit 323, receives this undershoot reaction time, and relatively produces the corresponding maximum undershoot reaction time of minimum value of this radiofrequency signal, and corresponding target focal position;
Change unit, position 324, with preposition reprogramming, controls this optical head change and on this optical record medium, carries out the focal position of burning;
Transmission module 33, according to the control of control module 32, by this adjusting of optical pickup to described corresponding target focal position of maximum undershoot reaction time.
Wherein, described radiofrequency signal is the burning radio-frequency signal producing in burning process.
Fig. 4 A is the oscillogram of the radiofrequency signal (RF Signal) that illustrates according to third embodiment of the invention.In this figure, illustrated amplitude I
14and I
14H, I wherein
14/ I
14Hbe defined as I
14/ I
14Hmodulation (I
14/ I
14Hmodulation).At this embodiment just with this I
14/ I
14Hmodulation is as basis, to adjust the focal position of optical head.Fig. 4 B is the process flow diagram of the focusing position adjusting method that illustrates according to third embodiment of the invention.Please refer to Fig. 4 A and Fig. 4 B, the step of the method for adjustment of the focal position of the optical head of this embodiment is as follows:
Step S401: one disc is carried out to burning at a focal position;
Step S402: suspend burning, with the data of a readout power retaking of a year or grade burning, to produce a corresponding radiofrequency signal;
Step S403: utilize above-mentioned radiofrequency signal, obtain absolute value of amplitude;
Described absolute value of amplitude is I14/I14H modulation value (I
14/ I
14Hmodulation);
Step S404: change above-mentioned focal position, and repeating step S401～step S403, with obtain a peak swing absolute value with and corresponding target focal position;
Work as I
14/ I
14Hwhen the modulation value of modulation is maximum, represent to focus on optimum position;
Step S405: adjusting of optical pickup, to this target focal position, can be carried out to burning to this optical record medium at this target focal position so that this optical head is follow-up.
Wherein, described radiofrequency signal is the reading radio frequency signal (Read RF) producing in retaking of a year or grade process.
Although this 3rd embodiment must suspend burning and retaking of a year or grade radiofrequency signal (RF Signal), in the process of this retaking of a year or grade, conventionally only need a fraction of data of retaking of a year or grade I can be detected
14/ I
14Hmodulation value, therefore, this embodiment still can make whole disc have from the inside to the outside consistent burning quality.
Corresponding to the method for embodiment tri-, the present invention also provides a kind of focal position maximum modulation value adjustment System of optical head, with reference to figure 4C, comprises sensing module 41, control module 42 and transmission module 43, wherein:
Sensing module 41, for sensing the burning light beam reflecting on this optical record medium.
Control module 42, comprising: a retaking of a year or grade detecting unit 421, a change unit, 422He Yi position, magnitude determinations unit 423, wherein:
Retaking of a year or grade detecting unit 421, for to suspending burning after burning, then detects to obtain an absolute value of amplitude with the reading radio frequency signal of the data institute correspondence generation of retaking of a year or grade burning.
Magnitude determinations unit 422, for receiving this absolute value of amplitude, and relatively produces a peak swing absolute value, and corresponding target focal position.
Change unit, position 423, with preposition reprogramming, controls this optical head change and on this optical record medium, carries out the focal position of burning.
Transmission module 43, according to the control of described control module 42, by this adjusting of optical pickup to this target focal position.
Wherein, absolute value of amplitude is I14/I14H modulation value; And radiofrequency signal is reading radio frequency signal (Read RF)
Described control module 42 also comprises one second storage unit, and for storing the corresponding target focal position of described peak swing absolute value, described target focal position is corresponding with preposition in change unit, position.
In sum, spirit of the present invention is in burning process, to change the focal position of optical head, produces undershoot magnitude of voltage or the I of corresponding burning radio-frequency signal
14/ I
14Hmodulation value.Secondly, hunt out minimum value (being the corresponding maximum undershoot reaction time) or the I of the undershoot magnitude of voltage of burning radio-frequency signal
14/ I
14Hthe maximal value of modulation value, with corresponding target focal position.Then, optical read head is adjusted to target focal position.The advantage of the method is can continue to adjust focal position according to the undershoot magnitude of voltage of burning radio-frequency signal during burning.
In addition, can also adjust result according to the focal position of a plurality of points of disc, determine the target focal position of optional position.For this reason, at Fig. 2 C, in control module in Fig. 3 C and Fig. 4 C, can also comprise one second storage unit (not shown), wherein, in Fig. 2 C and Fig. 3 C, described the second storage unit that described control module comprises, the corresponding target focal position of radiofrequency signal minimum value producing for storing described extreme value generation unit, described target focal position is corresponding with preposition in change unit, position; In Fig. 4 C, described the second storage unit that described control module comprises, be used for storing the corresponding target focal position of described peak swing absolute value, described target focal position is corresponding with preposition in change unit, position, thereby facilitate the focal position of a plurality of points of disc that change unit, position directly stores according to described the second storage unit to adjust result, determine the target focal position of optional position.
The specific embodiment proposing in the detailed description of preferred embodiment is only in order to convenient explanation the technology of the present invention content, but not the present invention is narrowly limited to above-described embodiment, in the situation that does not exceed spirit of the present invention and following claim, the many variations of doing is implemented, and all belongs to scope of the present invention.Therefore protection scope of the present invention is when being as the criterion depending on content that accompanying claim defines.
Claims (8)
1. the focusing position adjusting method of an optical head, this optical head is positioned at and the focal position of an optical record medium at a distance of a preset distance, in order to this optical record medium is sent to the burning light beam of a predetermined power, and by corresponding optical data burning on this optical record medium, this focusing position adjusting method comprises:
1) with a focal position, on this optical record medium, carry out burning;
2) suspend burning, with the data of a readout power retaking of a year or grade burning, to produce a corresponding radiofrequency signal;
3) utilize this radiofrequency signal, obtain absolute value of amplitude;
4) change this focal position, and repeat to enter step 1), with obtain a peak swing absolute value with and corresponding target focal position;
5) by this adjusting of optical pickup to this target focal position so that this optical head is follow-up, can to this optical record medium, carry out burning in this target focal position;
Wherein, described absolute value of amplitude is I14/I14H modulation value.
2. method of adjustment as claimed in claim 1, wherein said step 5) also comprise before the corresponding target focal position of this peak swing absolute value of storage, this target focal position is corresponding to step 1) in focal position.
3. radiofrequency signal method of adjustment as claimed in claim 1, wherein said step 2) producing is the reading radio frequency signal producing in retaking of a year or grade process.
4. as the method for adjustment as described in any one in claim 1-3, wherein said step 2) retaking of a year or grade be described step 1) partial data of burning.
5. the adjustment System of a focusing position of optical head, this optical head is positioned at and the focal position of an optical record medium at a distance of a preset distance, in order to this optical record medium is sent to the burning light beam of a predetermined power, and by corresponding optical data burning on this optical record medium, it is characterized in that, comprising:
Sensing module, for sensing the burning light beam reflecting on this optical record medium;
Control module, comprising: a change unit, position, and with preposition reprogramming, control this optical head change and on this optical record medium, carry out the focal position of burning; Retaking of a year or grade detecting unit, for to suspending burning after burning, then detects to obtain an absolute value of amplitude to a radiofrequency signal of the corresponding generation of the data of retaking of a year or grade burning institute; Described absolute value of amplitude is I14/I14H modulation value; Magnitude determinations unit, for receiving this absolute value of amplitude, and relatively produces a peak swing absolute value, and corresponding target focal position;
Transmission module, according to the control of described control module, by this adjusting of optical pickup to this target focal position.
6. adjustment System as claimed in claim 5, wherein said control module also comprises one second storage unit, be used for storing the corresponding target focal position of described peak swing absolute value, described target focal position is corresponding with preposition in change unit, position.
7. adjustment System as claimed in claim 5, what wherein said retaking of a year or grade detecting unit detected is the reading radio frequency signal producing in retaking of a year or grade process.
8. as the adjustment System as described in any one in claim 5-7, what wherein said retaking of a year or grade detecting unit detected is a radiofrequency signal of the corresponding generation of partial data institute of retaking of a year or grade burning.
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|---|---|---|---|
| CN201110089683.9A CN102157164B (en) | 2009-03-31 | 2009-03-31 | Focusing position adjusting method and system for optical head |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110089683.9A CN102157164B (en) | 2009-03-31 | 2009-03-31 | Focusing position adjusting method and system for optical head |
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|---|---|---|---|
| CN2009101291817A Division CN101527146B (en) | 2009-03-31 | 2009-03-31 | Focusing position adjusting method of optical head and system thereof |
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|---|---|---|---|---|
| CN1501374A (en) * | 2002-11-18 | 2004-06-02 | 联发科技股份有限公司 | Method for regulating focusing position of optical head |
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| CN1501374A (en) * | 2002-11-18 | 2004-06-02 | 联发科技股份有限公司 | Method for regulating focusing position of optical head |
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