CN102024468A - Control method for focusing tag surface - Google Patents
Control method for focusing tag surface Download PDFInfo
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- CN102024468A CN102024468A CN2009101759070A CN200910175907A CN102024468A CN 102024468 A CN102024468 A CN 102024468A CN 2009101759070 A CN2009101759070 A CN 2009101759070A CN 200910175907 A CN200910175907 A CN 200910175907A CN 102024468 A CN102024468 A CN 102024468A
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- voltage level
- label surface
- level curve
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Abstract
The invention relates to a control method for focusing a tag surface. The method comprises the following steps of: dividing a disk tag surface into sections; performing focusing stroke on each section; comparing to acquire the maximal light sum signal; approximating preliminary focus voltage level curves by using corresponding focus voltages and bar codes; compensating a preset voltage, and focusing the tag surface; comparing the preliminary focus voltage level curves in each section with the maximal light sum signal of the compensated voltages; and approximating and correcting the focus voltage level curves by using the corresponding focus voltages and the bar codes so as to reduce errors.
Description
Technical field
The relevant a kind of CD-ROM drive of the present invention is especially about in the CD-ROM drive with light carving function, when the disc label surface is portrayed label, in order to form voltage level control method of focusing.
Background technology
General light carving (Lightscribe) disc is to be coated with last layer coating in label surface, and the laser beam of utilizing the CD-ROM drive optical head to penetrate focuses on label surface, changes by label surface with its heat, forms label design.And not enough laser beam heat can't produce effective thermal distortion, will cause label design fuzzy.Thereby the optical head laser beam needs along with the disc that rotates focus to be focused on the label surface, could concentrate the heat of laser beam to obtain label design clearly.But the coating of label surface is also even not as the data of optical disk face, also not as data surface, can't produce effective focus error signal to the reflection of light characteristic, with Focus hold in label surface.
Please also refer to Fig. 1 and Fig. 2, Fig. 1 is the mode that the control of prior art disc label surface focuses on, the label surface focus voltage level that Fig. 2 forms for prior art.As shown in Figure 1, prior art optical head 1 drives object lens 3 and moves up and down by adjusting the electromagnetic force that actuator 2 voltages are produced, and with the laser beam of optical head 1 projection, is incident upon the label surface 5 of rotating disc 4.Again by label surface 5 with laser beam reflected back optics head 1, be radiated at light energy converter (Photodetector) 6.Light energy converter 6 comprises four light receivers such as being divided into A, B, C and D, receives the different zone of folded light beam respectively, receiving beam is converted to the electric signal of relative intensity again.Amplify the electric signal of addition (A+B+C+D) through amplifier 7, form the light aggregate signal (Side Beam Added Signal is called for short SBAD) of relative intensity h.Object lens 3 are at preset distance S up or in the focusing process that moves down, focus during near label surface 5 measured smooth aggregate signal strengthen gradually, reflected light is the strongest when focus focuses on label surface 5, light aggregate signal maximum, when focus was passed away from label surface 5, measured smooth aggregate signal then strengthened with distance label surface 5 and decays.
As shown in Figure 2, prior art is at first carved light disc 4 label surface in order to decide 400 bar codes (Spoke) 8 of angle orientation, is that a component becomes 8 radial segment (Zone) 9 with 50 bar codes.The laser beam of optical head 1 is projected to when rotating disc 4 radii fixuses 10, raises with voltage in the focusing process of optical head preset distance S at each section 9, on the way the recording light aggregate signal.Because section 9 restriction at interval, limited mobile preset distance S sets with the label surface 5 of passing general normal disc 4.Therefore in each section 9 focusing process, can obtain the maximum light aggregate signal that focus is passed label surface 5.Voltage strength and place bar code 8 according to 8 sections, 9 maximum light aggregate signal occur just can be similar to out a focus voltage level curve 11.Utilize focus voltage level curve 11, obtain corresponding focus voltage with optical head 1 place bar code 8, though with actual focus voltage error is arranged, without focus error signal, promptly removable object lens 3 roughly are locked in label surface 5 with focus, with the portrayal label design.
Yet, refer again to Fig. 1, when disc 4 produced the perk shown in dotted line 4 ' or is out of shape, limited mobile preset distance S in each section 9 focusing process was especially segmenting more multi-region section, section reduces at interval, mobile preset distance S more hour, focus Chang Wufa passes through the label surface 5 ' of distortion, the maximum light aggregate signal that is obtained, its focus is not really to drop on the label surface 5 ', causes the focus voltage level curve 11 that is similar to out to have bigger error.Excessive error allows the focus of portraying label design away from label surface 5 ', will cause label design fuzzy, and influences the degree of analysing clearly of whole label, even can't depict label design.Therefore, the control method that the prior art label surface focuses on still has problem to need to be resolved hurrily.
Summary of the invention
The object of the present invention is to provide a kind of label surface focusing controlling method,, increase or reduce the voltage of a predetermined value, compare the size of light aggregate signal, with the error of compensating focusing voltage level by preliminary focus voltage level curve.
Another purpose of the present invention is to provide a kind of label surface focusing controlling method, utilizes the error of compensating focusing voltage level curve, makes the label surface of disc can segment more multi-region section, to obtain the vernier focusing voltage level.
Still a further object of the present invention is to provide a kind of label surface focusing controlling method, by the maximum difference between threshold values inspection focus voltage level curve light aggregate signal, to determine suitable focus voltage level.
In order to reach the purpose of aforementioned invention, label surface focusing controlling method of the present invention, the disc label surface is distinguished into predetermined 20 sections, focus on stroke at each section, compare the maximum light aggregate signal of each section focusing stroke, utilize the corresponding focus voltage and the bar code of the maximum light aggregate signal of each section, approximate preliminary focus voltage level curve, preliminary focus voltage level curve is compensated a predetermined value voltage, form compensating focusing voltage level curve, carry out the focusing of label surface, and detection and recording light aggregate signal, the maximum light aggregate signal that relatively aforementioned preliminary focus voltage level curve and compensating focusing voltage level curve are obtained in each section again utilizes each section to obtain the corresponding focus voltage and the place bar code of maximum light aggregate signal, approximate correction focus voltage level curve.
The label surface focusing controlling method of another embodiment of the present invention, the disc label surface is distinguished into a predetermined section, focus on stroke at each section, compare the maximum light aggregate signal that each section obtains, utilize the corresponding focus voltage and the bar code of the maximum light aggregate signal of each section, an approximate preliminary focus voltage level curve, check that difference is in reservation threshold between the maximum light aggregate signal of each section, if difference is not in reservation threshold Δ T, then preliminary focus voltage level curve is compensated a predetermined value voltage, form compensating focusing voltage level curve, carry out the focusing of label surface, and detection and recording light aggregate signal, return aforementioned comparison step and proofread and correct, if in reservation threshold Δ T, then being set at preliminary focus voltage level curve, difference proofreaies and correct the focus voltage level curve.
Description of drawings
Fig. 1 is the synoptic diagram that the control of prior art disc label surface focuses on.
The label surface focus voltage level curve that Fig. 2 forms for prior art.
Fig. 3 is the synoptic diagram of first embodiment of the invention compensating focusing voltage level.
The synoptic diagram that Fig. 4 changes for light aggregate signal of the present invention.
Fig. 5 compares the synoptic diagram of each section light aggregate signal for the present invention.
Fig. 6 is a correction focus voltage level curve of the present invention.
Fig. 7 is the process flow diagram of first embodiment of the invention label surface focusing controlling method.
Fig. 8 is the synoptic diagram of second embodiment of the invention label surface focusing controlling method.
Fig. 9 is the process flow diagram of second embodiment of the invention label surface focusing controlling method.
Figure 10 is the actual test pattern of label surface focusing controlling method of the present invention.
[main element label declaration]
20 discs
20 ' label surface
21 preliminary focus voltage level curves
22 no deformation places
22a, 22b compensation point
23 concave parts
23a, 23b compensation point
24 epirelief positions
24a, 24b compensation point
25 value added focus voltage level curves
26 depreciation focus voltage level curves
Embodiment
Relevant the present invention is for reaching above-mentioned purpose, and technological means that is adopted and effect thereof are lifted preferred embodiment now, and cooperate graphic be illustrated as follows.
Please consult Fig. 3 and Fig. 4 simultaneously, Fig. 3 is the synoptic diagram of first embodiment of the invention compensating focusing voltage level, the synoptic diagram that Fig. 4 changes for compensation time aggregate signal.As shown in Figure 3, the present invention at first carves light 400 bar codes of disc 20 label surface 20 ', is subdivided into several radial segment, is a section with 20 bar codes for example, is divided into 20 section.As aforementioned prior art, in the focusing process of each section, the recording light aggregate signal, and the voltage strength and the place bar code of maximum light aggregate signal appear in the focusing process according to 20 sections, be similar to out a preliminary focus voltage level curve 21.Though preliminary focus voltage level curve 21 can be near the profile of label surface 20 ', but because the number of section increases, the preset distance that raises optical head in the focusing process shortens more, do not have the position 22 that is out of shape for disc 20, preliminary focus voltage level curve 21 still can provide correct focus voltage level.Concave part 23 as for disc 20 distortion, the focus voltage level that preliminary focus voltage level curve 21 is provided, focus will be above label surface 20 ', and the epirelief position 24 to being out of shape, the focus voltage level that preliminary focus voltage level curve 21 is provided, focus then is not enough to touch label surface 20 ', and both focuses all can't be locked on the label surface 20 '.
The present invention utilizes preliminary focus voltage level curve 21, increase the voltage of a preset value delta V, form the value added focus voltage level curve 25 of compensation, or utilize preliminary focus voltage level curve 21 to reduce the voltage of a preset value delta V, form compensation depreciation focus voltage level curve 26.As shown in Figure 4, for the position 22 of not having distortion, the voltage of preset value delta V that value added focus voltage level curve 25 increases will be gone up coke pushing point and surpass label surface 20 ', and the light aggregate signal will be decreased to compensation point 22a.The voltage of preset value delta V that depreciation focus voltage level curve 26 reduces then moves down out focus label surface 20 ', and the light aggregate signal will be decreased to compensation point 22b.And preliminary focus voltage level curve 21 still can allow the focus of no deformation place 22 focus on the label surface 20 ', and its light aggregate signal maintains maximum.
For concave part 23, the voltage of preset value delta V that value added focus voltage level curve 25 increases will be gone up coke pushing point and continue to make the light aggregate signal be decreased to compensation point 23a than concave part 23 away from label surface 20 '.The voltage of preset value delta V that depreciation focus voltage level curve 26 reduces then moves down focus near label surface 20 ', makes the light aggregate signal increase to compensation point 23b than concave part 23.And the maximal value of change concave part 23 smooth aggregate signal.Equally for epirelief position 24, the voltage of preset value delta V that depreciation focus voltage level curve 26 reduces, focus is moved down continuous away from label surface 20 ', make the light aggregate signal be reduced to compensation point 24b than epirelief position 24, the voltage of preset value delta V that value added focus voltage level curve 25 increases, then will go up the coke pushing point near label surface 20 ', and make the light aggregate signal increase to compensation point 24a than epirelief position 24.And the maximal value of change epirelief position 24 smooth aggregate signal.Therefore, the appearance again of concave part 23 and epirelief position 24 maximum light aggregate signal will make its focus more near label surface 20 '.
Utilize folk prescription to compensating the voltage that increases or reduce by a preset value delta V, can improve the maximal value of concave part 23 or epirelief position 24 single directional light aggregate signal.Because the concave part 23 of disc 20 and epirelief position 24 symmetry usually produce, and utilize the twocouese bucking voltage, improve simultaneously, can quicken to improve the efficient of error.Though the present invention is the example explanation with the twocouese bucking voltage, be not limited thereto, the exposure scope can contain the method for folk prescription to compensation of covering.As shown in Figure 5, compare the peaked synoptic diagram of each section light aggregate signal for the present invention.Owing to utilize value added focus voltage level curve 25 and depreciation focus voltage level curve 26, the actual focusing of carrying out label surface detects and the recording light aggregate signal.In each section, the light aggregate signal that more preliminary focus voltage level curve 21, value added focus voltage level curve 25 and depreciation focus voltage level curve 26 are produced is found out maximum light aggregate signal in each section then.By the corresponding voltage strength and the place bar code of maximum light aggregate signal in 20 sections, as shown in Figure 6, be similar to out correction focus voltage level curve 27, to improve the error of the preliminary focus voltage level curve of distortion disc.
As shown in Figure 7, be the flow process of first embodiment of the invention label surface focusing controlling method.Focus voltage level curve of the present invention increases or reduces the voltage of a preset value delta V, improves the detailed step of distortion disc error, is described as follows: at first at step P1, the disc label surface is distinguished into a predetermined radial segment.Step P2 focuses on stroke at each section, and detection and recording light aggregate signal.Enter step P3, compare each section and focus on the maximum light aggregate signal that stroke obtained.Then utilize each section to obtain the corresponding focus voltage and the place bar code of maximum light aggregate signal, be similar to out a preliminary focus voltage level curve at step P4.
At step P5, preliminary focus voltage level curve compensation is increased by a predetermined value voltage Δ V, form value added focus voltage level curve, compensate value added focus voltage level with this and carry out the focusing of label surface, and detection and recording light aggregate signal.At step P6, compensation reduces by a predetermined value voltage Δ V to the focus voltage level curve equally, forms depreciation focus voltage level curve, carries out the focusing of label surface with this compensation depreciation focus voltage level, and detection and recording light aggregate signal.Enter step P7 again, compare the light aggregate signal of aforementioned preliminary focus voltage level curve, value added focus voltage level curve and step P6 depreciation focus voltage level curve record, find out light aggregate signal maximum in each section.Then, utilize each section of step P7 to obtain the corresponding focus voltage and the place bar code of maximum light aggregate signal, be similar to out correction focus voltage level curve, as the focus voltage level of label surface at step P8.Enter step P9 at last, finish the operation of approximate focus voltage level curve.
Therefore, label surface focusing controlling method of the present invention, can be by the preliminary focus voltage level curve that obtains, compensation increases or reduces the voltage of a predetermined value, the focusing level curve of formed value added or depreciation, via the size of the light aggregate signal of the focusing level curve of preliminary focus voltage level curve in each section relatively, value added or depreciation, proofread and correct preliminary focus voltage level, reach the focus voltage level error of compensation disc distortion.Simultaneously, the present invention can utilize the error of compensating focusing voltage level curve, allows the disc label surface can segment more multi-region section, obtains accurate approximate focus voltage level, to portray label design clearly.
As shown in Figure 8, check the synoptic diagram of light aggregate signal maximal value difference for second embodiment of the invention label surface focusing controlling method.Though light carving disc label surface reflectivity is not as data surface, reflectivity is roughly the same, also should reach unanimity as the maximum light aggregate signal of each section focus in label surface.Therefore, can be used for variation between the maximum light aggregate signal of approximate focus voltage level curve, the error condition of inspecting the focus voltage level curve by each section.Between the maximum light aggregate signal of section, difference is big more, and the focus of some moderate finite deformation section does not reach suitable position near label surface as yet in the expression approximation.Present embodiment is preset a threshold values Δ T, as the door of inspecting suitable differences between the maximum light aggregate signal of section.With interior person, the focus voltage level curve that it is approximate can be portrayed label design clearly to difference at threshold values Δ T between the maximum light aggregate signal of section.With epigenesist, then need proofread and correct again by its approximate focus voltage level curve at threshold values Δ T for difference.
As shown in Figure 9, be the flow process of second embodiment of the invention label surface focusing controlling method.Present embodiment is inspected focus voltage level curve error, and the detailed step to proofread and correct is described as follows: at first at step S1, the disc label surface is distinguished into a predetermined radial segment.Step S2 focuses on stroke at each section, and detection and recording light aggregate signal.Enter step S3, compare the maximum light aggregate signal that each section obtains.Then utilize each section to obtain the corresponding focus voltage and the place bar code of maximum light aggregate signal, be similar to out a preliminary focus voltage level curve at step S4.
At step S5, check that difference is in reservation threshold Δ T between the maximum light aggregate signal of section? if difference is not at reservation threshold Δ T, then enter step S6 preliminary focus voltage level curve is compensated a value added predetermined value voltage Δ V, compensate value added focus voltage level with this and carry out the focusing of label surface, and detection and recording light aggregate signal.At step S7, to preliminary focus voltage level curve compensation depreciation one predetermined value voltage Δ V, carry out the focusing of label surface equally with this compensation depreciation focus voltage level, and detection and recording light aggregate signal.Be back to step S3 again and find out maximum light aggregate signal, continue to proofread and correct the focus voltage level curve by preliminary focus voltage level curve, value added focus voltage level curve, depreciation focus voltage level curve record.If difference enters step S8 in reservation threshold Δ T, the preliminary focus voltage level curve of step S4 is set at the correction focus voltage level curve of label surface, enter step S9 at last, finish the correction of focus voltage level curve.
As shown in figure 10, be label surface focusing controlling method of the present invention, to the actual formation of moderate finite deformation disc focus voltage level curve, solid line is the position of the focus voltage level curve flying optical head of label surface reality among the figure, the position of the focus voltage level curve flying optical head that dotted line is similar to out for the present invention, the error through measuring both maximums is 1.3 μ m.The present invention can significantly reduce the formed maximum error 2.8 μ m of preliminary focus voltage level curve, to improve the focusing of label surface.
Therefore, second embodiment of the invention label surface focusing controlling method can be by the difference between threshold values inspection focus voltage level curve gained light aggregate signal, and the suitable focus voltage level of decision label surface is to improve the usefulness of proofreading and correct the focus voltage level.
The above person only is that scope of the present invention is not limited to these preferred embodiments, and is all according to any change that the present invention did, and in not breaking away under the spirit of the present invention, all belongs to the scope of claim of the present invention in order to convenient explanation preferred embodiment of the present invention.
Claims (13)
1. label surface focusing controlling method, its step comprises:
(1) the disc label surface is distinguished into a predetermined section;
(2) focus on stroke at each section, and detection and recording light aggregate signal;
(3) compare each section and focus on the maximum light aggregate signal that stroke obtained;
(4) utilize each section to obtain the corresponding focus voltage and the place bar code of maximum light aggregate signal, be similar to a preliminary focus voltage level curve;
(5) preliminary focus voltage level curve is compensated a predetermined value voltage, form compensating focusing voltage level curve, carry out the focusing of label surface, and detection and recording light aggregate signal;
(6) the maximum light aggregate signal that relatively aforementioned preliminary focus voltage level curve and compensating focusing voltage level curve are obtained in each section again; And
(7) utilize each section of step (6) to obtain the corresponding focus voltage and the place bar code of maximum light aggregate signal, approximate correction focus voltage level curve.
2. label surface focusing controlling method according to claim 1, wherein this disc label surface is distinguished into 20 radial segment.
3. label surface focusing controlling method according to claim 1 wherein should compensate predetermined value voltage, for increasing by a predetermined value voltage, formed value added focus voltage level curve.
4. label surface focusing controlling method according to claim 1 wherein should compensate predetermined value voltage, for reducing by a predetermined value voltage, formed depreciation focus voltage level curve.
5. label surface focusing controlling method according to claim 1 wherein should compensate predetermined value voltage, for increasing and reduce a predetermined value voltage respectively.
6. label surface focusing controlling method according to claim 1, wherein this correction focus voltage level curve is the focus voltage level as label surface.
7. label surface focusing controlling method, its step comprises:
(1) the disc label surface is distinguished into a predetermined section;
(2) focus on stroke at each section, and detection and recording light aggregate signal;
(3) the maximum light aggregate signal that compares each section and obtained;
(4) utilize each section to obtain the corresponding focus voltage and the place bar code of maximum light aggregate signal, be similar to a preliminary focus voltage level curve;
(5) check that difference is in reservation threshold between the maximum light aggregate signal of each section of step (3)? if difference in reservation threshold Δ T, enters step (7), if difference then enters step (6) not in reservation threshold Δ T
(6) preliminary focus voltage level curve is compensated a predetermined value voltage, form compensating focusing voltage level curve, carry out the focusing of label surface, and detection and recording light aggregate signal, return step (3);
(7) the preliminary focus voltage level curve with step (4) is set at correction focus voltage level curve; And
(8) correction of end focus voltage level curve.
8. label surface focusing controlling method according to claim 7, wherein this disc label surface is distinguished into 20 radial segment.
9. label surface focusing controlling method according to claim 7 wherein should compensate predetermined value voltage, for increasing by a predetermined value voltage, formed value added focus voltage level curve.
10. label surface focusing controlling method according to claim 7 wherein should compensate predetermined value voltage, for reducing by a predetermined value voltage, formed depreciation focus voltage level curve.
11. label surface focusing controlling method according to claim 7 wherein should compensate predetermined value voltage, for increasing and reduce a predetermined value voltage respectively.
12. label surface focusing controlling method according to claim 7, wherein this correction focus voltage level curve is the focus voltage level as label surface.
13. label surface focusing controlling method according to claim 7, wherein this step (6) is with preliminary focus voltage level curve and compensating focusing voltage level curve, detect and the recording light aggregate signal, get back to the relatively light aggregate signal of each section maximum of step (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101759070A CN102024468A (en) | 2009-09-18 | 2009-09-18 | Control method for focusing tag surface |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101759070A CN102024468A (en) | 2009-09-18 | 2009-09-18 | Control method for focusing tag surface |
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|---|---|
| CN102024468A true CN102024468A (en) | 2011-04-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101759070A Pending CN102024468A (en) | 2009-09-18 | 2009-09-18 | Control method for focusing tag surface |
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|---|---|
| CN (1) | CN102024468A (en) |
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2009
- 2009-09-18 CN CN2009101759070A patent/CN102024468A/en active Pending
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Application publication date: 20110420 |