CN1917050A - Unit for controlling writing power inside optical recording device, and control method - Google Patents
Unit for controlling writing power inside optical recording device, and control method Download PDFInfo
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- CN1917050A CN1917050A CNA2005100287623A CN200510028762A CN1917050A CN 1917050 A CN1917050 A CN 1917050A CN A2005100287623 A CNA2005100287623 A CN A2005100287623A CN 200510028762 A CN200510028762 A CN 200510028762A CN 1917050 A CN1917050 A CN 1917050A
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Abstract
A control device of write-in power in optical recording unit consists of automatic laser-power regulation circuit used by DAC-VRDC and VRDC; VRDC magnetic track formed by VRDC horizontal sampling holder; VWDC magnetic track formed by automatic laser power regulation circuit used on VWDC and VWDC horizontal sampling holder; VWDC2 magnetic track being used to output voltage as per set value of DAC-VWDC2 and being formed by DAC VWDC2, DAC REF, amplifier and adder.
Description
Technical field
The invention relates to Writing power control device and control method thereof in the optical recorder, especially change about temperature characterisitic, writing the invention that quality worsens Writing power control device in a kind of optical recorder that phenomenon compensates and control method thereof according to the light picker of non-volatile recording.
Background technology
In optical recorder, for at CD-R, CD-RW, DVD+R, DVD-R, DVD+RW, DVD-RW, record data in the erasable optical disks such as DVD-RAM need have automatic laser power adjustment (the Automatic Laser Power Control: circuit ' ALPC ') that can keep required laser power.
Fig. 1 is to use existing automatic laser power to adjust the block scheme of the output control device of circuit.
With in the recording track, have 3 magnetic tracks that are called as VRDC, VWDC, VWDC2 in common optical recording.
VRDC (Voltage Read Disk Channel) is by DAC_VRDC101; VRDC adjusts circuit 102 with automatic laser power; The horizontal sampling holder 103 of VRDC constitutes.Numerical value according to the VRDC magnetic track is set with DAC (digital analog converter) forms backfeed loop, during record, VRDC voltage is maintained certain level, offers laser diode 108.
VWDC (Voltage Write Disk Channel) is by DAC_VWDC104; VWDC adjusts circuit 105 with automatic laser power; The horizontal sampling holder 106 of VWDC constitutes, and the numerical value according to the VWDC magnetic track is set with DAC forms backfeed loop, during record, VWDC voltage is maintained certain level, offers laser diode 108.
And the numerical value that the VWDC2 magnetic track is set by DAC_VWDC2107 successfully to the output of magnetic track voltage, offers laser diode 108.
Usually, during record data, VRDC is the voltage of readout power level in CD-RW, DVD+RW, DVD-RW, and VRDC+VWDC is a voltage of removing power level, and VRDC+VWDC+VWDC2 is the voltage of Writing power level.Similarly, during record data, VRDC is the horizontal voltage of readout power in DVD+R/-R, and VRDC+VWDC2 is the horizontal voltage of Writing power.
Here, the VRDC/VWDC magnetic track can form closed-loop (close loop) when record, and VWDC2 uses open-loop (open loop).
And, in DVD+R/-R, during record data, only using VRDC and VWDC2 magnetic track, VRDC operates by closed-loop, and VWDC2 operates by open-loop.
What Fig. 2 showed is along with temperature increases, the synoptic diagram that laser diode characteristics changes.
Common laser diode is opening entry under normal temperature (25 ℃), and along with the increase of writing time, the heat that laser diode is emitted does not cool off by the bottom of light picker, carries out accumulation of heat.
At this moment, as shown in Figure 2, if the electric current (idd) that flows in the laser diode does not increase along with the increase of the laser diode temperature of above-mentioned accumulation of heat, because the phenomenon of quality decline may appear writing in reading/removes/Writing power of can not keeping stipulating.Therefore, in order to increase this electric current (idd), should increase the voltage of VRDC, VWDC, VWDC2 respectively along with the increase of temperature.
That is,, thus, increase the electric current (idd) of laser diode, can keep reading/removing/the Writing power level, finish temperature compensation if, increase the voltage of VRDC, VWDC, VWDC2 along with the temperature of laser diode increases.Here, what deserves to be mentioned is, when magnetic track is closed-loop, this increase magnetic track voltage along with temperature increases, and adjusts circuit by automatic laser power and finishes automatically, still, when magnetic track is open-loop such as VWDC2, along with laser diode temperature increases, should increase the DAC_VWDC2107 setting value, can realize the temperature compensation of VWDC2 magnetic track.
Fig. 3 is when DVD+R, the non-volatile recording of DVD-R recording medium, finishes under the state of temperature compensation the recording impulse of laser diode output.Along with the continuous increase of writing time, VRDC and VWDC2 level increase gradually.
As above-mentioned, during record data, the VRDC magnetic track is a closed-loop in DVD+R/-R.Therefore, this magnetic track utilizes automatic laser power to adjust circuit, can realize auto thermal compensation, because the VWDC2 magnetic track is an open-loop, has only the DAC_VWDC2107 of increasing setting value, can realize temperature compensation.
In the prior art, there are the following problems: in DVD+R/-R during record data, in order to carry out the temperature compensation of VWDC2 magnetic track, system control need monitor periodically with microcomputer whether the voltage of the VRDC magnetic track of temperature compensation after the start-of-record increases, if VRDC voltage increases, when compensation behavior finishes till, need be according to the voltage of increase, increase the DAC_VWDC2107 setting value, very inconvenience operates.
And, during record, exist because the problem of said temperature compensation causing microcomputer burden.
Summary of the invention
The present invention seeks in order to address the above problem, for the user provides a kind of when removing in DVD+R/-R record data, in order to carry out the temperature compensation of VWDC2 magnetic track, system control monitors periodically with microcomputer whether the voltage of the VRDC magnetic track of temperature compensation after the start-of-record increases, if VRDC voltage increases, increase the repeated calculation process of VWDC2 voltage, minimizing is carried out the calculated amount of microcomputer in the process at record, Writing power control device and control method thereof in a kind of optical recorder that facilitates for the temperature compensation of VWDC2 magnetic track.
To achieve these goals, the Writing power control device is made of following components in the optical recorder of the present invention: by DAC_VRDC, VRDC with automatic laser power adjust circuit, the horizontal sampling holder of VRDC constitutes, according to the value of VRDC magnetic track with the DAC setting, form backfeed loop, during record, VRDC voltage is maintained the VRDC magnetic track of certain level; By DAC_VWDC, VWDC with automatic laser power adjust circuit, the horizontal sampling holder of VWDC constitutes, the value according to the VWDC magnetic track is set with DAC forms backfeed loop, during record, VWDC voltage is maintained the VWDC magnetic track of certain level; According to the value that DAC_VWDC2 sets, smooth VWDC2 magnetic track to the output of magnetic track voltage, wherein:
Described VWDC2 magnetic track is made of following components: before start-of-record, set the DAC_VWDC2 of VWDC2 magnetic track reference power; After the start-of-record,, set the DAC_REF of VRDC magnetic track voltage in order to carry out temperature compensation; After the start-of-record, will set along with temperature increases the voltage difference of DAC_REF (benchmark) of the VRDC voltage of the VRDC voltage that rises and record initial setting is carried out the gain adjustment of amplification according to the gain of specific settings the amplifier that can adjust gain; With the output of the above-mentioned amplifier that can adjust gain and the addometer that the DAC_VWDC2 output voltage carries out additive operation.
The feature of Writing power control device is in the optical recorder of the present invention: gain is adjusted amplifier and is preferably set by microcomputer.
The feature of Writing power control device is in the optical recorder of the present invention: DAC_REF preferably understands VRDC voltage by microcomputer, and sets the voltage of understanding.
And the Writing power control method comprises following step in the optical recorder of the present invention, and as feature: a) judge optical disc types, by carrying out the best power adjustment, calculating optimum power determines the step of the reference power that uses in each magnetic track; B) step of opening entry; C) measure the voltage of VRDC magnetic track, measurement result voltage is set to step among the DAC_REF; D) according to the temperature characterisitic of light picker, adjust the step of setting the yield value that determines in advance in the amplifier in gain; E) pass through addometer, the voltage difference of setting in VRDC voltage and the DAC_REF carried out the VWDC2 reference power voltage addition set in the value of amplification output and the DAC_VWDC2, and output, the step that above-mentioned output valve is used with voltage as the VWDC2 magnetic track of laser diode.
The feature of Writing power control method is in the optical recorder: after step e) also comprises the steps: whole end of record (EOR)s, above-mentioned DAC_VRDC, DAC_VWDC2, DAC_REF, the amplifier that can adjust gain all are initialized as 0 step.
Effect of the present invention:
Writing power control device and control method thereof reach following effect in the optical recorder of the present invention: in DVD+R/-R during record data, initial setting by microcomputer, can simply carry out the temperature compensation of the VWDC2 magnetic track of non-volatile recording, simultaneously, reach the effect that raising writes quality.
And, during record data, the incident that microcomputer should be handled increases, and participates in energetically with microcomputer in common optical recorder, carry out the existing temperature compensation of the temperature compensation of VWDC2 magnetic track and compare, reach the effect that effectively alleviates the microcomputer burden.
For further specifying above-mentioned purpose of the present invention, design feature and effect, the present invention is described in detail below with reference to accompanying drawing.
Description of drawings
Fig. 1 is to use existing automatic laser power to adjust the block scheme of the output control device of circuit.
What Fig. 2 showed is the temperature characterisitic synoptic diagram of laser diode.
Fig. 3 finishes under the situation of temperature compensation, the recording impulse of laser diode output.
Fig. 4 is the block scheme of the output control device of the embodiment of the invention.
Fig. 5 is the precedence diagram of the temperature compensation disposal route of the embodiment of the invention.
The symbol description of major part in the accompanying drawing:
101:DAC-VRDC 102,105: the automatic laser power adjustment
103,106: sampling holder 107:DAC-VWDC2
108: laser diode 401:DAC-REF
402: the amplifier 403 that can adjust gain: addometer
Embodiment
Embodiment to Writing power control device and control method thereof in the optical recorder of the present invention is elaborated below with reference to accompanying drawings.
Fig. 4 is the block scheme of the interior Writing power control device of optical recorder of the embodiment of the invention.
In the present embodiment, the Writing power control device is made of VRDC, VWDC, VWDC2 magnetic track in the optical recorder.
Present embodiment roughly shown by initial value is set, after, there is not the control of microcomputer, the system of control VWDC2 magnetic track voltage.
We can find out from Fig. 4, VRDC is identical with existing formation with the VWDC magnetic track, from important composition key element of the present invention--VWDC2 magnetic track, it is made of following components: before the start-of-record, set the DAC_VWDC2 107 of the reference power of VWDC2 magnetic track; After the start-of-record,, set the DAC_REF (benchmark) 401 of VRDC magnetic track voltage for temperature compensation; After the start-of-record, will set along with temperature increases the amplifier that can adjust gain 402 that the voltage difference of DAC_REF401 of the VRDC voltage of the VRDC voltage that rises and record initial setting is carried out the amplification adjustment according to the certain gain of setting; The addometer 403 that DAC_VWDC2 107 output voltages of the output of the above-mentioned amplifier 402 that can adjust gain and the reference power of setting the VWDC2 magnetic track are carried out additive operation.
In the above-described configuration, VRDC magnetic track and VWDC magnetic track are identical with Writing power device in being included in existing optical recorder.Therefore, below, the VWRD2 magnetic track that is different from prior art with reference to 5 pairs in accompanying drawing is elaborated.
Fig. 5 is the precedence diagram of the temperature compensation disposal route of the embodiment of the invention.
Present embodiment has roughly shown the method for adjusting the output voltage of DAC_VWDC2 107 magnetic tracks.
Below, be elaborated with reference to 5 pairs of methods of adjusting the output voltage of above-mentioned DAC_VWDC2 107 magnetic tracks of accompanying drawing.
Step 501 is processes of judging relative photo pen recorder type.
Because DVD and the distance of CD from the surface to the recording layer are respectively 0.6/1.2mm, so reflectivity is also different.Therefore, it is play and the kind and the signal processing method of the laser that uses also there are differences, the user is necessary to judge in the early stage the type of this CD.Till now, mainly use DVD laser, move to lens, detect the above connection sum of errors focussing error signal of specified level, generate its corresponding digital signal (FOK: focusing OK), measure the distance from the surface to the recording layer from lower face.
The present invention can be suitable for multiple CD, in the above-described embodiments, is limited to DVD+R and DVD-R.
Step 502 is to carry out best power adjustment (OPC), the process of calculating optimum power.
In now all optical recording medias during recorded information, in order to obtain best play property, the process that need seek the optimum power value of recording medium--best power adjustment.Common best power method of adjustment is, be positioned at the power adjustment region (power Calibration Area) in week of all CDs such as CD and DVD, the laser beam of scanning and record 10-15 stage varying strength, play this interval, wherein, (Radio Frequency: radio frequency) Dui Ying laser beam intensity is set at optimum power value to the RF that broadcast state is best, during physical record, reflects by Writing power.
Step 503 is to set the process of DAC-VRDC101, DAC_VWDC2 107 values.
In the DVD+R/-R medium, only use VRDC and VWDC2 magnetic track, the reference power of VRDC magnetic track is set in DAC_VRDC101, and the reference power of VWDC2 magnetic track is set in DAC_VWDC2 107.
Step 504 is processes of opening entry.
Step 505 is by Control of Voltage to step 508, the process that the temperature of laser diode 108 is risen and compensates.
If start-of-record, system microcomputer is measured the voltage of VRDC magnetic track, sets measurement result voltage (setting the VRDC level value) in DAC_REF401, finishes the initial setting of the temperature compensation of VRDC voltage rising contrast VWDC2 magnetic track.Then, according to the temperature characterisitic of light picker, the gain value settings of decision is in advance adjusted in the amplifier to gain.
The gain of above-mentioned amplifier by having set, after start-of-record, irrelevant with microcomputer, the voltage difference of setting in VRDC voltage that rises along with the temperature increase and the DAC_REF401 is carried out amplification output, the voltage of the amount of temperature compensation correspondence of output VWDC2 magnetic track.
The VWDC2 voltage of said temperature compensation is by addometer 403, again with the VWDC2 reference power voltage addition of 107 li settings of DAC_VWDC2, with its VWDC2 magnetic track voltage as laser diode, the VWDC2 magnetic track is along with the temperature of VRDC rises, voltage changes, and finishes temperature compensation.
That is, the characteristics of Writing power control device and control method thereof are in the optical recorder of the present invention: during record data, by the initial setting of microcomputer, realize VWDC2 magnetic track effect temperature compensation in DVD+R/-R.
Step 509, whether end record.
Step 510 is if end record is each initial value to be set at 0 process.
If end record in order to carry out next record, is adjusted amplifier 402 with DAC_VRDC101, DAC_VWDC2 107, DAC_REF401, the gain once used in the DVD+R/-R record and all is initialized as 0.
Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claims of the present invention variation, the modification of the above embodiment.
Claims (5)
1, Writing power control device in a kind of optical recorder, constitute by following components: by DAC_VRDC, VRDC adjusts circuit, the horizontal sampling holder formation of VRDC with automatic laser power, according to the value of VRDC magnetic track with the DAC setting, form backfeed loop, during record, VRDC voltage is maintained the VRDC magnetic track of certain level; By DAC_VWDC, VWDC with automatic laser power adjust circuit, the horizontal sampling holder of VWDC constitutes, the value according to the VWDC magnetic track is set with DAC forms backfeed loop, during record, VWDC voltage is maintained the VWDC magnetic track of certain level; Value according to DAC_VWDC2 sets to the VWDC2 magnetic track of magnetic track voltage output, is characterized in that smoothly:
Described VWDC2 magnetic track is made of following components: before start-of-record, set the DAC_VWDC2 of the reference power of VWDC2 magnetic track;
After the start-of-record,, set the DAC_REF of VRDC magnetic track voltage in order to carry out temperature compensation;
After the start-of-record, will set along with temperature increases the amplifier that can adjust gain that the voltage difference of DAC_REF benchmark of the VRDC voltage of the VRDC voltage that rises and record initial setting is carried out the gain adjustment of amplification according to the certain gain of setting;
Can adjust the amplifier output of gain and the addometer that described DAC_VWDC2 output voltage carries out additive operation with above-mentioned.
2, Writing power control device in the optical recorder according to claim 1 is characterized in that:
The described amplifier that can adjust gain is set by microcomputer.
3, Writing power control device in the optical recorder according to claim 1 is characterized in that:
Described DAC_REF understands described VRDC voltage by microcomputer, sets the voltage of understanding.
4, Writing power control method in a kind of optical recorder is characterized in that comprising following step:
A) judge optical disc types, by carrying out the best power adjustment, calculating optimum power determines the step of the reference power that uses in each magnetic track;
B) step of opening entry;
C) measure the voltage of VRDC magnetic track, measurement result voltage is set to step among the DAC_REF;
D) according to the temperature characterisitic of light picker, adjust the step of setting the yield value that determines in advance in the amplifier in gain;
E) pass through addometer, to carry out the VWDC2 reference power voltage addition set in the value of amplification output and the DAC_VWDC2 with the difference of the voltage set in VRDC voltage and the DAC_REF, output, the step that above-mentioned output valve is used with voltage as the VWDC2 magnetic track of laser diode.
5, as Writing power control method in the optical recorder as described in the claim 4, it is characterized in that:
After described step e) also comprised the steps: whole end of record (EOR)s, with described DAC_VRDC, DAC_VWDC2, DAC_REF, the amplifier that can adjust gain all was initialized as 0 step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100287623A CN100414618C (en) | 2005-08-15 | 2005-08-15 | Unit for controlling writing power inside optical recording device, and control method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100287623A CN100414618C (en) | 2005-08-15 | 2005-08-15 | Unit for controlling writing power inside optical recording device, and control method |
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| Publication Number | Publication Date |
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| CN1917050A true CN1917050A (en) | 2007-02-21 |
| CN100414618C CN100414618C (en) | 2008-08-27 |
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| CNB2005100287623A Expired - Fee Related CN100414618C (en) | 2005-08-15 | 2005-08-15 | Unit for controlling writing power inside optical recording device, and control method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7808871B2 (en) | 2006-03-16 | 2010-10-05 | Sunplus Technology Co., Ltd. | Power control apparatus and method for an optical drive |
| CN101131828B (en) * | 2006-08-24 | 2011-04-27 | 凌阳科技股份有限公司 | Power control method for optical disc drive |
| CN101447203B (en) * | 2007-11-29 | 2012-07-18 | 联发科技股份有限公司 | Method for deriving precise control over laser power of an optical pickup unit, and associated automatic power calibration circuit |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100252103B1 (en) * | 1997-12-12 | 2000-05-01 | 윤종용 | Temperature compensation apparatus of laser diode and method thereof |
| KR100350983B1 (en) * | 2000-02-03 | 2002-08-28 | 삼성전자 주식회사 | Laser diode driver, initializing method of optical recording/reproducing apparatus therefor, and driving method of laser diode driver |
| KR100393213B1 (en) * | 2001-02-07 | 2003-07-31 | 삼성전자주식회사 | Automatic power control apparatus in the disk drive |
| JP4166092B2 (en) * | 2003-01-07 | 2008-10-15 | 三洋電機株式会社 | Optical disk device and method for controlling optical disk device |
| US7646682B2 (en) * | 2003-11-17 | 2010-01-12 | Keng-Lon Lei | Focusing controller and method thereof for an optical disk drive |
-
2005
- 2005-08-15 CN CNB2005100287623A patent/CN100414618C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7808871B2 (en) | 2006-03-16 | 2010-10-05 | Sunplus Technology Co., Ltd. | Power control apparatus and method for an optical drive |
| CN101131828B (en) * | 2006-08-24 | 2011-04-27 | 凌阳科技股份有限公司 | Power control method for optical disc drive |
| CN101447203B (en) * | 2007-11-29 | 2012-07-18 | 联发科技股份有限公司 | Method for deriving precise control over laser power of an optical pickup unit, and associated automatic power calibration circuit |
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| Publication number | Publication date |
|---|---|
| CN100414618C (en) | 2008-08-27 |
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