CN100369131C - Method for regulating optical head inclination angle - Google Patents
Method for regulating optical head inclination angle Download PDFInfo
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- CN100369131C CN100369131C CNB031565336A CN03156533A CN100369131C CN 100369131 C CN100369131 C CN 100369131C CN B031565336 A CNB031565336 A CN B031565336A CN 03156533 A CN03156533 A CN 03156533A CN 100369131 C CN100369131 C CN 100369131C
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- optical head
- inclination
- controlling value
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Abstract
The present invention relates to a method for regulating the incline angles of an optical head, which is used for controlling the incline amount of the optical head so as to reduce the error rate for reading and recording information. The present invention has the characteristics of comprising the following steps of moving an optical head to a track needing to regulate an incline control value; outputting a laser beam with constant power; setting the change range of the incline control values; controlling the incline angles of the optical head according to the change range of the incline control values, picking up an RF signal corresponding to each incline control value, and storing relevant signal values; searching whether the relevant signal values have a maximum value, if have the maximum value, the incline control value corresponding to the maximum value is stored to be used as the incline control value of the track; if not, the change range of the incline control values is modified to execute the previous steps. The relevant signal values comprise the value of a track crossing signal, the value of the RF signal which is written / read, the value of an S curve, and the level of the RF signal.
Description
Technical field
The present invention relates to a kind of inclination angle of optical head method of adjustment.
Background technology
The optical head of optical recording and reading device (optical pickup) needs an actuator (actuator) to adjust object lens (object lens), the information that makes these optical devices read or write down, EFM (Eight to Fourteen Modulation) signal for example, strong (robust).This actuator can accurately move on to optical head the position (angle) that needs.Yet, when desire to read or write down discs the situation of warpage (curved) is arranged, or the angle of optical pickup tilt (tilt) is when incorrect, the information that reads or write down will produce deterioration (deteriorates).In order to compensate the situation of this deterioration information, must measure the relative tilt angle between optical head and the discs, and be adjusted the angle of inclination of optical head in good time.
Fig. 1 is the framework of general inclination adjusting device.As shown in the drawing, this framework comprises an optical head 10, an inclination detector and object lens 16.These optical head 10 rotatable earth's axis are propped up in rotating shaft 18, and are rotated by actuator (figure does not show) control.And the inclination detector utilizes optical transmitting set 12 emission light, utilize optical receiver 14a, 14b to receive the light of reflection after, can detect tilt quantity, and utilize this tilt quantity to control actuator.This mode is directly to utilize relative tilt angle between optical head and the discs to adjust the angle of inclination of optical head.
Fig. 2 shows a kind of optical pickup tilt angle method of adjustment that does not need the displacement detection device.As shown in the drawing, this tilt control module 20 comprises a regeneration signal generation unit 22, a shake detector 23, a tilt control unit 24, a tilt drive 25 and a storage unit 26.Regenerated signal generation unit 22 is used for radio frequency (Radio Frequency that optical head is produced, RF) conversion of signals becomes 8-14 modulation (Eight toFourteen Modulation, hereinafter to be referred as EFM) signal, for example use cutter (slicer) to cut out 0 and 1 signal.Shake detector 23 receives the EFM signal, and detects the amount of jitter of this EFM signal.General amount of jitter is to calculate the degree of EFM signal front and back drift.Tilt control unit 24 is the different inclination controlling values (corresponding to different optical pickup tilt amounts) of output, and writes down pairing amount of jitter, and filters out the amount of jitter minimum or be lower than the inclination controlling value of shaking critical value, with the inclination controlling value as this track.25 tilt quantity that change optical head according to the inclination controlling value output drive signal of tilt control unit 24 to optical module 21 of tilt drive.The inclination controlling value can be digital signal, and is stored in storage unit 26.And should the inclination controlling value (Digital/Analog Converter DAC) exports tilt drive 25 to after the conversion through digital analog converter.Tilt drive 25 is with the pairing signal of inclination controlling value, and for example the voltage signal of 0-4V converts to and drives the drive signal that optical head rotates.
Though this mode can not need the displacement detection device can adjust the optical pickup tilt angle to better position, must there be the discs of burning data just can utilize the amount of jitter of EFM signal to adjust the optical pickup tilt angle.For blank (nude film) then because can't obtain the EFM signal, so can't adjust the inclination controlling value.
Summary of the invention
Because the problems referred to above, the present invention proposes a kind of inclination angle of optical head method of adjustment that does not need the displacement detection device and can be applied to blank (nude film) and materials and pictures simultaneously.
Inclination angle of optical head method of adjustment of the present invention is realized by following technical scheme.
A kind of inclination angle of optical head method of adjustment is characterized in that comprising the following step:
Flying optical head is to the track that needs to adjust the inclination controlling value;
The go forward side by side line focusing control of the laser beam of output constant power;
Set inclination controlling value variation range;
According to the pitch angle of aforementioned inclination controlling value variation range control optical head, and capture the pairing radiofrequency signal of each inclination controlling value, and store correlated signal values; And
Search correlated signal values and whether have maximal value, if exist maximal value then to store the inclination controlling value of the pairing inclination controlling value of this maximal value as this track, if do not exist maximal value then to revise inclination controlling value variation range, and it is rapid to re-execute previous step.
Described inclination angle of optical head method of adjustment is characterized in that: aforementioned correlated signal values is the seeking signal size.
Described inclination angle of optical head method of adjustment is characterized in that: aforementioned correlated signal values is the size of the radiofrequency signal that writes/read.
Described inclination angle of optical head method of adjustment is characterized in that: aforementioned correlated signal values is the S curve sizes.
Described inclination angle of optical head method of adjustment is characterized in that: aforementioned correlated signal values is a radiofrequency signal position standard.
Described inclination angle of optical head method of adjustment, it is characterized in that: whether exist in the peaked step in the search correlated signal values, also comprise the action of stored data being carried out low-pass filtering, use filtering noise, and make the pairing curve of correlated signal values more smooth-going.
Inclination angle of optical head method of adjustment of the present invention comprises flying optical head is adjusted the inclination controlling value to needs track; The laser beam of output constant power; Set inclination controlling value variation range; According to the pitch angle of inclination controlling value variation range control optical head, and capture the pairing radiofrequency signal of each inclination controlling value, and store correlated signal values; And search correlated signal values and whether have maximal value, if exist maximal value then to store the inclination controlling value of the pairing inclination controlling value of this maximal value,, and re-execute preceding step if do not exist maximal value then to revise inclination controlling value variation range as this track.
And so-called correlated signal values comprises size, S curve (S-curve) size, and the radiofrequency signal position standard of the size of seeking signal, the radiofrequency signal that writes/read.
The invention has the advantages that:
Inclination angle of optical head method of adjustment of the present invention need not dispose the tilt quantity that a displacement detection device can correctly be controlled optical head, uses to reduce and reads and the data error rate during burning.
For method of the present invention, feature and effect thereof are had further understanding, enumerate concrete fact Example now and be described with reference to the accompanying drawings as follows:
Description of drawings
Fig. 1 is the framework of general inclination adjusting device.
Fig. 2 is the Organization Chart of the optical devices at the another kind of tool angle of inclination of adjusting optical head.
Fig. 3 is inclination controlling value and the graph of a relation of striding rail error signal size, and wherein transverse axis is the inclination controlling value, and the longitudinal axis is for striding the rail error signal.
Fig. 4 is inclination controlling value and the little graph of a relation of W/RRF amplitude, and wherein transverse axis is the inclination controlling value, and the longitudinal axis is the W/RRF amplitude.
Fig. 5 is the graph of a relation of inclination controlling value and S-curve sizes, and wherein transverse axis is the inclination controlling value, and the longitudinal axis is the S-curve sizes.
Fig. 6 is the graph of a relation of inclination controlling value and radiofrequency signal position standard, and wherein transverse axis is the inclination controlling value, and the longitudinal axis is a radiofrequency signal position standard.
The process flow diagram of Fig. 7 inclination angle of optical head method of adjustment of the present invention.
Embodiment
Below with reference to graphic detailed description inclination angle of optical head method of adjustment of the present invention.Generally speaking, under the laser beam of constant power, if optical head and discs do not have the angle of inclination, that is be 90 degree, then owing to the volume reflection maximum of laser beam, (Radio frequency signal RF) has maximal value to the radiofrequency signal that reads from discs, and by the coherent signal that this radiofrequency signal is derived, also be maximal value.The present invention promptly adjusts the inclination controlling value of optical head according to this characteristic.And coherent signal can be including but not limited to the size of the size of seeking signal (tracking cross signal), the radiofrequency signal that writes/read, S curve sizes, and radiofrequency signal position standard.
Fig. 3 is the graph of a relation of inclination controlling value (tilt control value) and seeking signal size, and wherein transverse axis is the inclination controlling value, and the longitudinal axis is the seeking signal size.The inclination controlling value is generally digital signal, for example the scope of the inclination controlling value of Fig. 3 is from-16 to 16, this inclination controlling value offers the pitch angle that a tilt drive (figure does not show) is controlled optical head after can converting simulating signal to via a digital analog converter DAC (figure does not show).As shown in Figure 3, under equivalent environment, the laser of constant power etc. for example, the seeking signal size can change along with the difference of inclination controlling value, and when seeking signal is maximal value, represent the inclination controlling value of this moment can make optical head and discs not have the pitch angle.So, as long as set the scope of inclination controlling value, and in this inclination controlling value scope, obtain pairing seeking signal size, then have the optimum tilt controlling value that the maximum pairing inclination controlling value of seeking signal size is this track.
Fig. 4 for the inclination controlling value with write/graph of a relation of reading radio frequency signal (W/RRF) amplitude size, wherein transverse axis is the inclination controlling value, and the longitudinal axis is to write/amplitude of reading radio frequency signal W/RRF.The inclination controlling value is generally digital signal, for example the scope of the inclination controlling value of Fig. 4 is from-22 to 16, this inclination controlling value offers the pitch angle that a tilt drive (figure does not show) is controlled optical head after can converting simulating signal to via a digital analog converter DAC (figure does not show).As shown in Figure 4, under equivalent environment, laser of constant power etc. for example, write/reading radio frequency signal W/RRF amplitude can change along with the difference of inclination controlling value, and when write/when reading radio frequency signal W/RRF amplitude is maximal value, represent this moment the inclination controlling value can make optical head and discs not have the pitch angle.So, as long as set the scope of inclination controlling value, and in this inclination controlling value scope, obtain pairing writing/reading radio frequency signal W/RRF amplitude, then have maximum writing/pairing inclination controlling value of reading radio frequency signal W/RRF amplitude and be the optimum tilt controlling value of this track.
Fig. 5 is the graph of a relation of inclination controlling value and S-curve sizes, and wherein transverse axis is the inclination controlling value, and the longitudinal axis is the S-curve sizes.The inclination controlling value is generally digital signal, for example the scope of the inclination controlling value of Fig. 5 is from-16 to 16, this inclination controlling value offers the pitch angle that a tilt drive (figure does not show) is controlled optical head after can converting simulating signal to via a digital analog converter DAC (figure does not show).As shown in Figure 5, under equivalent environment, laser of constant power etc. for example, the S-curve sizes can change along with the difference of inclination controlling value, and when the S-curve sizes is maximal value, represent the inclination controlling value of this moment can make optical head and discs not have the pitch angle.So, as long as set the scope of inclination controlling value, and in this inclination controlling value scope, obtain pairing S-curve sizes, then have the optimum tilt controlling value that the maximum pairing inclination controlling value of S-curve sizes is this track.
Fig. 6 is the graph of a relation of inclination controlling value and radiofrequency signal position standard, and wherein transverse axis is the inclination controlling value, and the longitudinal axis is a radiofrequency signal position standard.The inclination controlling value is generally digital signal, for example the scope of the inclination controlling value of Fig. 6 is from-16 to 16, this inclination controlling value offers the pitch angle that a tilt drive (figure does not show) is controlled optical head after can converting simulating signal to via a digital analog converter DAC (figure does not show).As shown in Figure 6, under equivalent environment, laser of constant power etc. for example, the radiofrequency signal position will definitely change along with the difference of inclination controlling value, and when radiofrequency signal position standard is maximal value, represent the inclination controlling value of this moment can make optical head and discs not have the pitch angle.So, as long as set the scope of inclination controlling value, and in this inclination controlling value scope, obtain pairing radiofrequency signal position standard, then have the optimum tilt controlling value that the accurate pairing inclination controlling value in maximum radiofrequency signal position is this track.
Fig. 7 is the process flow diagram of inclination angle of optical head method of adjustment of the present invention.As shown in the drawing, the step of inclination angle of optical head method of adjustment of the present invention is:
Step S702: flying optical head is to the orbital position that needs to adjust the inclination controlling value.For example, when discs is just put into CD-ROM drive, optical head can be moved to inner ring and outer ring, and adjust respectively and storage inclination controlling value.
Step S704: go forward side by side line focusing control of the laser beam of output constant power.In the process of adjusting, be maintained fixed the laser beam of power.
Step S706: set inclination controlling value variation range.Can be rule of thumb the variation range of inclination controlling value be set in preferred range, uses an adjustment time that contracts.
Step S708: control the pitch angle of optical head in regular turn according to the variation range of inclination controlling value, and capture each inclination controlling value corresponding radio frequency signal RF, and calculate and store correlated signal values.Can comprise seeking signal in this so-called correlated signal values, read the radiofrequency signal size that writes, S curve sizes, and radiofrequency signal position standard etc.As for the calculating of these signals or the signal that provides for disk drive unit is provided, all produce basically, in this no longer repeat specification by the combination of main light beam (main beam) with auxiliary beam (sub beam).
Does step S712: the correlated signal values of searching the rope storage have maximal value? if there is not maximal value, then may be that the variation range of oblique controlling value is too small, then skip to step S714; If the maximal value of existence is arranged, then skip to step S716.
Step S714: relax the variation range of inclination controlling value, and rebound step step S708.
Step S716: store the inclination controlling value of the pairing inclination controlling value of maximal value of correlated signal values as this track.
In step S708, if the coherent signal seeking signal is then noted down the amplitude of seeking signal.If coherent signal S curve (S-curve) then note down the amplitude of S curve (S-curve), and this S curve (S-curve) can be observed by lens are moved up and down.If coherent signal RFRP or W/RRF then seek the peak-peak (peak value) of RFRP or W/RRF.If coherent signal RF position standard is then sought the maximal value of RF position standard.
And in step S712, before there is not maximal value in the searching correlated signal values, can earlier the correlated signal values that is write down be carried out the action of low-pass filtering, use filtering noise, and make the pairing curve of correlated signal values more smooth-going.So, just can be because of noise the search of the value of having the greatest impact.
Though more than with embodiment the present invention is described, therefore do not limit scope of the present invention, only otherwise break away from main idea of the present invention, the sector person can carry out various distortion or change.
Claims (6)
1. inclination angle of optical head method of adjustment is characterized in that comprising the following step:
Flying optical head is to the track that needs to adjust the inclination controlling value;
The go forward side by side line focusing control of the laser beam of output constant power;
Set inclination controlling value variation range;
According to the pitch angle of aforementioned inclination controlling value variation range control optical head, and capture the pairing radiofrequency signal of each inclination controlling value, and store correlated signal values; And
Search correlated signal values and whether have maximal value, if exist maximal value then to store the inclination controlling value of the pairing inclination controlling value of this maximal value as this track, if do not exist maximal value then to revise inclination controlling value variation range, and it is rapid to re-execute previous step.
2. inclination angle of optical head method of adjustment according to claim 1 is characterized in that: aforementioned correlated signal values is the seeking signal size.
3. inclination angle of optical head method of adjustment according to claim 1 is characterized in that: aforementioned correlated signal values is the size of the radiofrequency signal that writes/read.
4. inclination angle of optical head method of adjustment according to claim 1 is characterized in that: aforementioned correlated signal values is the S curve sizes.
5. inclination angle of optical head method of adjustment according to claim 1 is characterized in that: aforementioned correlated signal values is a radiofrequency signal position standard.
6. inclination angle of optical head method of adjustment according to claim 1, it is characterized in that: whether exist in the peaked step in the search correlated signal values, also comprise the action of stored data being carried out low-pass filtering, use filtering noise, and make the pairing curve of correlated signal values more smooth-going.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031565336A CN100369131C (en) | 2003-09-03 | 2003-09-03 | Method for regulating optical head inclination angle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031565336A CN100369131C (en) | 2003-09-03 | 2003-09-03 | Method for regulating optical head inclination angle |
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| Publication Number | Publication Date |
|---|---|
| CN1591616A CN1591616A (en) | 2005-03-09 |
| CN100369131C true CN100369131C (en) | 2008-02-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031565336A Expired - Fee Related CN100369131C (en) | 2003-09-03 | 2003-09-03 | Method for regulating optical head inclination angle |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1244702A (en) * | 1998-08-05 | 2000-02-16 | 三星电子株式会社 | Photo recording and reproducing device, and its declining regulation method and recording control method |
| US6041030A (en) * | 1996-09-18 | 2000-03-21 | Kabushiki Kaisha Toshiba | Optical disk recording/reproducing device with eccentric and incline chuck control |
| US6137754A (en) * | 1997-04-23 | 2000-10-24 | Pioneer Electronic Corporation | Search method for information record medium |
| CN1277712A (en) * | 1998-09-14 | 2000-12-20 | 松下电器产业株式会社 | Tilt detection device, optical disc device, and tilt control method |
| CN1409306A (en) * | 2001-09-25 | 2003-04-09 | 提阿克株式会社 | Optic disc device |
-
2003
- 2003-09-03 CN CNB031565336A patent/CN100369131C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6041030A (en) * | 1996-09-18 | 2000-03-21 | Kabushiki Kaisha Toshiba | Optical disk recording/reproducing device with eccentric and incline chuck control |
| US6137754A (en) * | 1997-04-23 | 2000-10-24 | Pioneer Electronic Corporation | Search method for information record medium |
| CN1244702A (en) * | 1998-08-05 | 2000-02-16 | 三星电子株式会社 | Photo recording and reproducing device, and its declining regulation method and recording control method |
| CN1277712A (en) * | 1998-09-14 | 2000-12-20 | 松下电器产业株式会社 | Tilt detection device, optical disc device, and tilt control method |
| CN1409306A (en) * | 2001-09-25 | 2003-04-09 | 提阿克株式会社 | Optic disc device |
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| Publication number | Publication date |
|---|---|
| CN1591616A (en) | 2005-03-09 |
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Granted publication date: 20080213 Termination date: 20160903 |