CN1306504C - Laser power contol method of optical recording system and its device - Google Patents
Laser power contol method of optical recording system and its device Download PDFInfo
- Publication number
- CN1306504C CN1306504C CNB021419655A CN02141965A CN1306504C CN 1306504 C CN1306504 C CN 1306504C CN B021419655 A CNB021419655 A CN B021419655A CN 02141965 A CN02141965 A CN 02141965A CN 1306504 C CN1306504 C CN 1306504C
- Authority
- CN
- China
- Prior art keywords
- signal
- optical recording
- tag format
- usefulness
- laser power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The present invention relates to a laser power control method and a device thereof of an optical recording system, wherein the optical recording system has a light source which is used for providing a light incidence write signal which can be used for recording data on an optical recording media. The laser power control method comprises an optical detection circuit for detecting a reflection write signal which is used for obtaining the light incidence write signal, and a tag format effectiveness signal which is used for presenting optical recording effectiveness is generated by a signal generation circuit of tag format effectiveness according to the reflection write signal. A first and a second components are separated from the tag format effectiveness signal by using a laser power compensation circuit which comprises a filter, and the output power of the light source is controlled respectively according to the first and the second components.
Description
Technical field
The present invention is meant a kind of laser power control method and device thereof that the optical recording system of best titime quality can be provided especially relevant for a kind of laser power control method and device thereof on optical recording media.
Background technology
In optical data recording, one light source, normally the laser that goes out of a laser and/write hair can produce a write signal that is used at an optical recording media identifying recording layer, therefore in order to ensure data record correctly, it is very important that laser output is maintained a suitable power level.And general common use one best power control (OPC) technology decides an initial laser Writing power, its practice is at first at optical recording medium, for example on the CD-R, distribute the usefulness of a section as calibration of power test, and on this section, use a series of laser power to carry out some exercise records, then described exercise record is read, the Writing power level that then produces the best titime quality promptly is selected the write signal power level as the best, and writes signal power level with this best carry out the real data record on other section of this CD.Yet, in most optical recording system, this best write signal power can't be kept fixing, but can be subjected to the variable influence of system and CD so that need be corrected, these variables that reduce the record qualities comprise: the variation in thickness of the record dye layer of optical recording media and substrate birefringence, because change, temperature and the disc slope of measuring point that the laser length offset causes, defocus, derail and problem such as location.Therefore a kind of technology that can afford redress at the variable of above-mentioned different kenels with the laser power of effective control optical recording system truly has the needs that are developed and exist.
Summary of the invention
Therefore, fundamental purpose of the present invention is to provide a kind of laser power control method and device thereof that the optical recording system of best titime quality can be provided on optical recording media.
Therefore, the laser power control apparatus of optical recording of the present invention system, but wherein this optical recording system has a light source to provide a light incident write signal that can form the tag format that light detects on an optical recording media with at this optical recording media identifying recording layer.This laser power control apparatus comprises an optical detection circuit, a tag format usefulness signal generating circuit and a laser power compensating circuit.This optical detection circuit is located at this light incident write signal from a reflection paths of this optical recording media reflection, to detect and to obtain a reflection write signal of this light incident write signal.This tag format usefulness signal generating circuit is connected with above-mentioned optical detection circuit, but the corresponding tag format usefulness of the tag format signal to detect according to this reflection write signal generation one and the light that is formed on this optical recording media.This laser power compensating circuit is connected between above-mentioned tag format usefulness signal generating circuit and the light source, with output power according to this this light source of tag format usefulness signal controlling, and this laser power compensating circuit also comprises a wave filter, and this tag format usefulness signal is obtained a first frequency composition via this wave filter, and this first frequency composition and this tag format usefulness signal obtained a second frequency composition after computing, and respectively according to the output power of first frequency composition and this light source of second frequency Composition Control of this tag format usefulness signal.Reach the purpose of the high and low frequency variable that can control this optical recording system respectively by this.
In addition, the laser power control method of optical recording of the present invention system, but wherein this optical recording system has a light source to provide a light incident write signal that can form the tag format that light detects on an optical recording media with at this optical recording media identifying recording layer.The method comprising the steps of, and a. detects and obtains the reflection write signal of this light incident write signal from this optical recording media reflection.But b. according to this reflection write signal generation one and the corresponding tag format usefulness of the tag format signal that is formed on the light detection on this optical recording media.C. according to the output power of this this light source of tag format usefulness signal controlling, its also with this tag format usefulness signal through filtering filter a first frequency composition, and this first frequency composition and this tag format usefulness signal obtained a second frequency composition after computing, and respectively according to the output power of first frequency composition and this light source of second frequency Composition Control of this tag format usefulness signal.
Description of drawings
Further feature of the present invention and advantage, in following cooperation DETAILED DESCRIPTION OF THE PREFERRED with reference to the accompanying drawings, it is clearer to become, in the accompanying drawings:
Shown in Figure 1 is the circuit block diagram of a preferred embodiment of the laser power control method of optical recording of the present invention system and device thereof;
Shown in Figure 2 is the detailed circuit calcspar of this laser power compensating circuit in this preferred embodiment;
Shown in Figure 3 is a case illustrated of a kind of ZCLV recording mode in the optical recording system;
Fig. 4 is presented at the process flow diagram of obtaining the tag format echo signal in the ZCLV recording mode; And
Fig. 5 is the operational flowchart of output power restricting circuits shown in Figure 2.
The contrast of assembly label
2 optical recording medias
3 laser power control apparatus
4 optical detection circuits
5 tag format usefulness (MFE) signal generating circuits
6 laser power compensating circuits
7 tag format usefulness (MFE) echo signals obtain circuit
10 lasing light emitters
61 wave filters
62 first controllers
63 second controllers
64 output power restricting circuits
DAC_L first compensating signal
DAC_H second compensating signal
The del_dac compensating signal
Embodiment
At first, see also shown in Figure 1, it is the circuit block diagram of a preferred embodiment of the laser power control method of optical recording of the present invention system and device thereof, wherein, this optical recording system has a lasing light emitter 10 (it is a laser and/write head), this lasing light emitter 10 provide one can be at an optical recording media 2 (a for example CD-R sheet) but go up and form the light incident write signal of tag format (markformation) that light detects (optically-detectable) with at these optical recording media 2 identifying recording layers.3 of this laser power control apparatus include an optical detection circuit 4, a tag format usefulness (mark formationeffectiveness, MFE) signal generating circuit 5 (hereinafter to be referred as MFE signal generating circuit 5) and a laser power compensating circuit 6.And this laser power control method comprises the following steps:
A. the light incident write signal of lasing light emitter 10 that this optical detection circuit 4 is arranged on this optical recording system is from a reflection paths of this optical recording media 2 reflections, to detect and to obtain reflection write signal (the reflected write pulse of this light incident write signal from these optical recording media 2 reflections, hereinafter to be referred as the WRF signal), and include corresponding to this reflection that is recorded the part of data in this WRF signal and write pulse wave.
B. utilize this MFE signal generating circuit 5 to be connected with above-mentioned optical detection circuit 4, but make the corresponding tag format usefulness of the tag format signal (mark formation effectiveness is hereinafter to be referred as the MFE signal) that detects according to above-mentioned WRF signal generation one and the light that is formed on this optical recording media 2.And this MFE signal is represented the record quality of the tag format that this WRF signal produces on this optical recording media 2.Have multiple and be all the known known technology of person skilled as for the circuit structure of this MFE signal generating circuit 5, do not add at this and give unnecessary details.
C. utilize this laser power compensating circuit 6 according to this MFE signal, control the output power of this lasing light emitter (being laser diode) 10.And as shown in Figures 1 and 2, this laser power compensating circuit 6 is connected between above-mentioned lasing light emitter 10 and the MFE signal generating circuit 5, and it comprises a wave filter 61, one first controller 62, one second controller 63 and an output power restricting circuits 64.This wave filter 61 is low-pass filters, it receives the MFE signal of this MFE signal generating circuit 5 outputs and it is carried out low-pass filtering and exports one first composition (hereinafter to be referred as the MFE_lpf signal) of this MFE signal, and this first composition is actually a low-frequency component of this MFE signal, and this MFE signal and this MFE-lpf signal can be obtained one second composition (hereinafter to be referred as the MFE_hpf signal) of this MFE signal after a subtracter 65 computings (promptly subtracting each other), and this second composition is actually a radio-frequency component of this MFE signal, wherein influence some low frequency variable of record quality in implicit this optical recording system of this MFE_lpf signal, such as the dye layer thickness of optical recording media, temperature and optical maser wavelength skew etc.Some high frequency variable of influence record quality in then implicit this optical recording system in this MFE_hpf signal is such as defocusing and disc tilt etc.
In addition, in order accurately to control the output power of this lasing light emitter 10, the present invention also provides one to be connected this MFE signal and to obtain tag format usefulness (MFE) echo signal of 6 of circuit 5 and luminous power compensating circuits and obtain circuit 7 (obtaining circuit 7 hereinafter to be referred as the MFE echo signal), the reference when obtaining tag format usefulness (MFE) echo signal (hereinafter to be referred as the MFE echo signal) as the control laser power.And this MFE echo signal obtains mode that circuit 7 obtains this MFE echo signal according to the different recording mode of this optical recording system and different, and present known recording mode has following two kinds:
(1) CLV (constant linear speed) record: when optical recording system during with CLV (constant linear speed) mode record data, this optical recording system is before carrying out offical record, can carry out aforesaid best power control (Optimum Power Control earlier, hereinafter to be referred as OPC), that is utilize lasing light emitter 10 to export different laser power write signals, in a test section of an optical recording media 2, to write down test, and behind the reflection write signal WRF by these optical detection circuit 4 detection said write signals, send into this MFE signal and obtain circuit 5 and obtain and the corresponding MFE signal of said write signal, this MFE echo signal obtain that circuit 7 promptly extracts described MFE signal and by the MFE signal of choosing this representative optimal laser power write signal (being the best titime quality) in the described MFE signal as this MFE echo signal.Therefore, in with the CLV recording mode, this MFE echo signal carries out promptly obtaining via aforesaid way before the data recording beginning, and this MFE echo signal to obtain circuit 7 be shut-down operation obtaining and export this MFE echo signal to laser power compensating circuit 6.So when beginning to carry out data recording, the MFE signal of being obtained circuit 5 outputs by this MFE signal promptly can directly export in this laser power compensating circuit 6.
(2) ZCLV (region constant linear speed) record: as shown in Figure 5, when writing down in the ZCLV mode, because its writing speed can increase along with the difference in zone outward gradually by interior, therefore, this MFE echo signal obtains the MFE echo signal that circuit 7 obtains under different recording speed also can be different.So as shown in Figure 3, different with the CLV recording mode is, on this optical recording media (CD), each regional Z1, Z2 ... Z
nThe writing speed difference of (by outward interior), therefore, must be at each regional Z1, Z2 ... Z
nCarry out OPC (its practice is as above-mentioned) before the opening entry data, in the hope of each regional Z1, Z2 ... Z
nThe MFE echo signal (MFE target _ 1, MFE target _ 2 ... the MFE target _ n), the 6th figure is the one operating process.At first can give an original records speed S earlier in flow process 81, then in flow process 82 in regular turn to regional Z
n(n=1...n) write down test and judge whether to obtain this regional MFE target _ n (n=1...n) signal? that is this MFE echo signal obtains circuit 7 and extracts the described MFE signal relative with write signal, and therefrom chooses a MFE signal as this MFE echo signal _ n (n=1...n).If obtain, then enter flow process 84 and make MFE echo signal=MFE target _ n (n=1...n), otherwise, make MFE echo signal=MFE target _ lpf through flow process 83,84.Does then flow process 85 judge that writing speed S changes (promptly changing posting field)? be then to change writing speed S and get back to flow process 82 and repeat OPC to obtain next MFE echo signal.By this, this MFE echo signal obtains circuit 7 and can obtain the interim MFE echo signal that changes under the ZCLV recording mode.So, in the ZCLV recording mode, this optical recording system can the change according to posting field carry out OPC in recording process, and this MFE echo signal obtains circuit 7 and promptly obtains this regional MFE echo signal when carrying out OPC in each zone, and after the MFE echo signal is obtained and export to this laser power compensating circuit 6, when each zone began to carry out data recording, it was shut-down operation that this MFE echo signal obtains circuit 7.Therefore in carrying out recording process, the MFE signal of being obtained circuit 7 outputs by the MFE signal promptly directly exports this laser power compensating circuit 6 to.
Therefore, get back to shown in Figure 2, in this laser power compensating circuit 6, obtain MFE echo signal that circuit 7 tries to achieve and above-mentioned MFE_lpf signal subtraction and the difference signal that produces is admitted in this first controller 62 by this MFE echo signal, and this first controller 62 is low frequency controllers, and it calculates according to a setting value of being tried to achieve by experiment (for example 0.2) and produces one in order to compensate the first compensating signal DAC_L of described low frequency variable.This MFE_hpf signal then calculates according to a setting value of being tried to achieve by experiment (for example 0.5) via this second controller 63 (high frequency controller) and produces one in order to compensating the second compensating signal DAC_H of described high frequency variable, and this first and second compensating signal DAC_H and DAC_L also are merged into a compensating signal del_dac (it is a control voltage) back output to control the output power of this lasing light emitter 10 via a combiner 66.
In addition; in order to protect this optical recording system and to prevent the generation of maloperation; the control voltage of this compensating signal del_dac can be transfused to earlier in this output power restricting circuits 64 before being output this lasing light emitter 10 of control; and limiting the output rate of change and the size of the control voltage of this compensating signal del_dac according to the best power opc_dac that aforementioned OPC produces, its control flow is as shown in Figure 5.At first, flow process 91 is according to setting restrictive condition by the best power control voltage of OPC output, control voltage change ratio comprising compensating signal limits, maximum and minimum laser power control voltage output and the setting of initial laser power control voltage etc., 92 of flow processs are to obtain the control voltage of answering compensating signal del_dac from laser power compensating circuit 7, and next output power control voltage is made as the control voltage that last output power control voltage adds this compensating signal del_dac, whether the control voltage of judging this compensating signal del-dac then in flow process 93 and 94 greater than limiting rate of change and zero, with in flow process 95,96,97 set different laser power control voltage respectively.Then, judge with flow process 98 and 99 whether this laser power control voltage is controlled in the voltage limit maximum and minimum respectively, and limit the laser power control voltage of this output with flow process 100 and 101 in good time.Therefore, the rate of change of the control voltage by limiting this compensating signal del_dac and output power that big I suitably limits this lasing light emitter 10 prevent not reason output power and rate of change is excessive reduces the record quality and protect lasing light emitter and the generation of pre-anti-misoperation of this lasing light emitter in a confidence band.
Via above-mentioned explanation, principal feature of the present invention can be summarized as follows:
1. in this laser power compensating circuit 6, by this (low pass) wave filter 61 the high and low frequency composition (i.e. the high and low frequency variable of this optical recording system) of this MFE signal is isolated, and control at the high and low frequency composition of this MFE signal respectively with this first and second (being low frequency and high frequency) controller 63,62 respectively, the high and low frequency variable that makes this optical recording system produce can suitably be suppressed.In addition; the size and the rate of change of the control voltage by 64 pairs of these compensating signals of this output power restricting circuits del_dac limit; can avoid output power because of changing the excessive record quality that reduces, and its maximum to the control voltage of this compensating signal del_dac/minimum value restriction can protect lasing light emitter (laser and/write head) 10 unlikely quilts excessively to drive (overdrive) and prevention because of the lead to errors generation of control operation of external disturbance or flaw disc.
2. this MFE echo signal obtains circuit 7 applicable to the optical recording system with CLV or ZCLV mode record data.
In sum, the laser power control method and the device thereof of optical recording of the present invention system, really can obtain the reflection write signal ((WRF signal) of the light incident write signal of lasing light emitter 10 by optical detection circuit 4, and produce the MFE signal of a reacting record quality according to this by MFE signal generating circuit 5, and this MFE signal and MFE echo signal are obtained the MFE echo signal that circuit 7 produced send into this laser power compensating circuit produces this lasing light emitter 10 of control after suitably relatively reaching export-restriction compensating signal, reach the effect that can accurately control the output power of this lasing light emitter 10 and promote the record quality of this optical recording system.
The above only is the preferred embodiments of the present invention, and the equivalent structure of all application instructions of the present invention and claims changes, ought to be within the scope of the present invention.
Claims (22)
1. the laser power control apparatus of an optical recording system, this optical recording system has a light source, but it provides a light incident write signal that can form the tag format that light detects on an optical recording media, with at this optical recording media identifying recording layer; This laser power control apparatus comprises:
One optical detection circuit is located at this light incident write signal from a reflection paths of this optical recording media reflection, to detect and to obtain a reflection write signal of this light incident write signal;
One tag format usefulness signal generating circuit is connected with above-mentioned optical detection circuit, but the corresponding tag format usefulness of the tag format signal to detect according to this reflection write signal generation one and the light that is formed on this optical recording media;
One laser power compensating circuit, be connected between above-mentioned tag format usefulness signal generating circuit and the light source, with output power according to this this light source of tag format usefulness signal controlling, and this laser power compensating circuit also comprises a wave filter, make this tag format usefulness signal via this wave filter filter a first frequency composition, and this first frequency composition and this tag format usefulness signal obtained a second frequency composition after computing, and respectively according to the output power of first frequency composition and this light source of second frequency Composition Control of this tag format usefulness signal.
2. the laser power control apparatus of optical recording as claimed in claim 1 system, wherein this wave filter is a low-pass filter, this first frequency composition is a low-frequency component of this tag format usefulness signal, and this second frequency composition is that this tag format usefulness signal deducts the resulting radio-frequency component of this first frequency composition.
3. the laser power control apparatus of an optical recording system, this optical recording system has a light source, but it provides a light incident write signal that can form the tag format that light detects on an optical recording media with at this optical recording media identifying recording layer; And this device comprises:
One optical detection circuit is located at this light incident write signal from a reflection paths of this optical recording media reflection, to detect and to obtain a reflection write signal of this light incident write signal;
One tag format usefulness signal generating circuit, but be connected with above-mentioned optical detection circuit to produce the corresponding tag format usefulness of a tag format signal that detects with the light that is formed on this optical recording media according to this reflection write signal;
One laser power compensating circuit is connected between above-mentioned tag format usefulness signal generating circuit and the light source, with the difference signal control according to a tag format usefulness echo signal and this tag format usefulness signal
The output power of this light source, and this laser power compensating circuit also comprises a wave filter, an one first frequency controller and a second frequency controller, and the difference signal that the first frequency composition that this tag format usefulness signal is obtained via this wave filter and this tag format usefulness echo signal produce after computing is sent into this first frequency controller, and this first frequency composition become to be distributed into this second frequency controller with the second frequency that this tag format usefulness signal obtains after computing, make respectively output power according to this difference signal and this this light source of second frequency Composition Control.
4. the laser power control apparatus of optical recording as claimed in claim 3 system, wherein this wave filter is a low-pass filter, this first frequency controller is a low frequency controller, this second frequency controller is a high frequency controller, and this first frequency composition is a low-frequency component of this tag format usefulness signal, and this second frequency composition is that this tag format usefulness signal deducts the resulting radio-frequency component of this first frequency composition.
5. the laser power control apparatus of optical recording as claimed in claim 3 system, wherein the tag format usefulness signal that produces of this tag format usefulness signal generating circuit is represented the record quality of the tag format that this light incident write signal produces on this optical recording media.
6. the laser power control apparatus of optical recording as claimed in claim 3 system, comprise that also a tag format usefulness echo signal that is connected with this laser power compensating circuit obtains circuit, and it is when this optical recording system writes test at first on optical recording media that this tag format usefulness echo signal obtains circuit, chooses one and represent the tag format usefulness signal of optimum write power as this tag format usefulness echo signal from the corresponding tag format usefulness signal that the corresponding Writing power of this tag format usefulness signal generating circuit is produced.
7. the laser power control apparatus of optical recording as claimed in claim 6 system, wherein this tag format usefulness echo signal obtains circuit and can be applicable in the optical recording system with constant linear speed and region constant linear speed mode record data, and in region constant linear speed recording mode, can be according to the different tag format usefulness echo signal of the corresponding generation of the writing speed of zones of different.
8. the laser power control apparatus of optical recording as claimed in claim 3 system, wherein the first frequency controller of this laser power compensating circuit be at this difference signal adequate compensation producing one first compensating signal, and this second frequency controller is that second frequency composition adequate compensation at this tag format usefulness signal is to produce one second compensating signal.
9. the laser power control apparatus of optical recording as claimed in claim 8 system, wherein this laser power compensating circuit also comprises a combiner that is connected with this first frequency controller and second frequency controller, in order to this first and second compensating signal be merged into output behind the compensating signal and control the output power of this light source.
10. the laser power control apparatus of optical recording as claimed in claim 8 system; wherein this laser power compensating circuit also comprises an output power restricting circuits that is connected with this combiner, and output rate of change and size that this output power restricting circuits can limit the control voltage of this compensating signal take place to protect this light source and pre-anti-misoperation.
11. the laser power control apparatus of optical recording as claimed in claim 3 system, wherein this light source is a laser and/write head.
12. the laser power control method of an optical recording system, this optical recording system has a light source, but it provides a light incident write signal that can form the tag format that light detects on an optical recording media with at this optical recording media identifying recording layer, and this method comprises:
A. detect and obtain the reflection write signal of this light incident write signal from this optical recording media reflection;
But b. according to this reflection write signal generation one and the corresponding tag format usefulness of the tag format signal that is formed on the light detection on this optical recording media; And
C. according to the output power of this this light source of tag format usefulness signal controlling, wherein also with this tag format usefulness signal through filtering filter a first frequency composition, and this first frequency composition and this tag format usefulness signal obtained a second frequency composition after computing, and respectively according to the output power of first frequency composition and this light source of second frequency Composition Control of this tag format usefulness signal.
13. the laser power control method of optical recording as claimed in claim 12 system, in step c, this tag format usefulness signal system is through low-pass filtering, and this first frequency composition is a low-frequency component of this tag format usefulness signal, and this second frequency composition is a radio-frequency component of this tag format usefulness signal.
14. the laser power control method of an optical recording system, this optical recording system has a light source, but it provides a light incident write signal that can form the tag format that light detects on an optical recording media with at this optical recording media identifying recording layer, and this method comprises:
A. detect and obtain the reflection write signal of this light incident write signal from this optical recording media reflection;
But b. according to this reflection write signal generation one and the corresponding tag format usefulness of the tag format signal that is formed on the light detection on this optical recording media; And
C. the difference signal after computing is controlled the output power of this light source according to a tag format usefulness echo signal and this tag format usefulness signal, wherein be that this tag format usefulness signal is produced this difference signal through a first frequency composition and this tag format usefulness echo signal that filtering obtains after computing, and this first frequency composition and this tag format usefulness signal obtained a second frequency composition after computing, and respectively according to the output power of this difference signal and this this light source of second frequency Composition Control.
15. the laser power control method of optical recording as claimed in claim 14 system, in step c, this tag format usefulness signal system is through low-pass filtering, and this first frequency composition is a low-frequency component of this tag format usefulness signal, and this second frequency composition is a radio-frequency component of this tag format usefulness signal.
16. the laser power control method of optical recording as claimed in claim 14 system, wherein the record quality of the tag format that on this optical recording media, produces of this tag format usefulness signal system this light incident write signal of expression.
17. the laser power control method of optical recording as claimed in claim 14 system, in step c, obtaining of this tag format usefulness echo signal is to write when test at first in this optical recording system on optical recording media, from the corresponding tag format usefulness of said write power signal choose one and represent the tag format usefulness signal of optimum write power as this tag format usefulness echo signal.
18. the laser power control method of optical recording as claimed in claim 17 system, wherein the adquisitiones of this tag format usefulness echo signal can be applicable in the optical recording system that writes down with constant linear speed and region constant linear speed mode, and in the mode with region constant linear speed record, this tag format usefulness echo signal can be adjusted relatively according to the rotating speed of zones of different.
19. the laser power control method of optical recording as claimed in claim 14 system, in step c, also according to this difference signal adequate compensation producing one first compensating signal, and according to this radio-frequency component adequate compensation to produce one second compensating signal.
20. the laser power control method of optical recording as claimed in claim 19 system in step c, also is merged into a compensating signal to control the output power of this light source with this first and second compensating signal.
21. the laser power control method of optical recording as claimed in claim 20 system in step c, also limits the output rate of change and the size of the control voltage of this compensating signal, to protect the generation of this light source and pre-anti-misoperation.
22. the laser power control method of optical recording as claimed in claim 14 system, wherein this light source is a laser and/write head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021419655A CN1306504C (en) | 2002-08-29 | 2002-08-29 | Laser power contol method of optical recording system and its device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021419655A CN1306504C (en) | 2002-08-29 | 2002-08-29 | Laser power contol method of optical recording system and its device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1479286A CN1479286A (en) | 2004-03-03 |
| CN1306504C true CN1306504C (en) | 2007-03-21 |
Family
ID=34147913
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021419655A Expired - Fee Related CN1306504C (en) | 2002-08-29 | 2002-08-29 | Laser power contol method of optical recording system and its device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1306504C (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010004344A1 (en) * | 1999-12-17 | 2001-06-21 | Roh Jin Tae | Method and apparatus for controlling optimal writing power for an optical recording medium |
| CN1337690A (en) * | 2000-07-06 | 2002-02-27 | 先锋株式会社 | Optical recording medium capable of rewriting and producing method and apparatus |
-
2002
- 2002-08-29 CN CNB021419655A patent/CN1306504C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010004344A1 (en) * | 1999-12-17 | 2001-06-21 | Roh Jin Tae | Method and apparatus for controlling optimal writing power for an optical recording medium |
| CN1337690A (en) * | 2000-07-06 | 2002-02-27 | 先锋株式会社 | Optical recording medium capable of rewriting and producing method and apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1479286A (en) | 2004-03-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6944105B2 (en) | Method of reproducing information with equalization for the reproduced information to reduce inter-symbol interference | |
| US8279733B2 (en) | Dynamic write strategy modification method and apparatus | |
| US4689779A (en) | Tracking control system for optical record disc information reproducing apparatus | |
| KR950034126A (en) | Write-once optical disc recording device | |
| US7274640B2 (en) | Apparatus and method for determining disc type | |
| US7869333B2 (en) | Optical disc apparatus and optical disc reproducing method | |
| CN1306504C (en) | Laser power contol method of optical recording system and its device | |
| KR100711348B1 (en) | Optical disc device and information recording/reproduction method | |
| US20060198262A1 (en) | Optical recording apparatus and optical recording method controlling laser power for disc overwriting | |
| US7092338B2 (en) | Method and apparatus for controlling laser beam power in an optical recording system | |
| US8472297B2 (en) | Optical disc apparatus, information recording method, and optical disc | |
| KR20040036663A (en) | Recording and reproduction apparatus | |
| JP2009516320A (en) | System and method for controlling the power of a radiation source | |
| KR20070095344A (en) | Optical focus error offset to reduce radial to vertical crosstalk | |
| JP2006172667A (en) | Method for determining recording power initial value, optical information recording and reproducing device, and optical information recording medium incorporating information obtained by the method | |
| JP3931774B2 (en) | Defect detection device | |
| CN1585974A (en) | Optical record carrier recording method and recording apparatus | |
| JPH06274922A (en) | Optical information recording and reproducing device | |
| KR19990060323A (en) | Servo compensation method and apparatus in the presence of optical disc defect | |
| JPH06274921A (en) | Optical information reproducing device | |
| JPH0636288A (en) | Rf signal amplitude controller for optical reproducer | |
| KR0132647B1 (en) | Error recompensation apparatus and method of optical magnetic device | |
| JP2007287214A (en) | Optical disk device | |
| US20040081042A1 (en) | Optical disc drive | |
| KR20000031404A (en) | Optimum servo setting method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070321 Termination date: 20160829 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |