CN1307618C - Judgment method for optical drive to perform optimal power correction timing - Google Patents
Judgment method for optical drive to perform optimal power correction timing Download PDFInfo
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- CN1307618C CN1307618C CNB2003101029812A CN200310102981A CN1307618C CN 1307618 C CN1307618 C CN 1307618C CN B2003101029812 A CNB2003101029812 A CN B2003101029812A CN 200310102981 A CN200310102981 A CN 200310102981A CN 1307618 C CN1307618 C CN 1307618C
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000003287 optical effect Effects 0.000 title abstract description 10
- 230000009471 action Effects 0.000 claims abstract description 14
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 6
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- 230000000630 rising effect Effects 0.000 description 3
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- 238000001514 detection method Methods 0.000 description 1
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- NHDHVHZZCFYRSB-UHFFFAOYSA-N pyriproxyfen Chemical compound C=1C=CC=NC=1OC(C)COC(C=C1)=CC=C1OC1=CC=CC=C1 NHDHVHZZCFYRSB-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention relates to a method for judging the time for executing the best power correction of an optical drive. The invention records the relationship between the driving signal value and the temperature by utilizing a Look-Up Table (Look Up Table) stored in a memory; the driving signal value output by the compensator can be compared with the internal temperature of the CD-ROM according to the lookup table, and when the temperature is higher than a specific temperature, the optimal power correction action is executed.
Description
Technical field
The present invention relates to the output power of laser diode control in the CD-ROM drive, and be particularly related to a kind of CD-ROM drive and carry out determination methods and the closed circuit control circuit thereof that best power is proofreaied and correct opportunity.
Background technology
Laser diode in the CD-ROM drive is arranged on the light source that is used as writable disc on the optical read/write head.And during the write activity in CD-ROM drive, laser diode must continue to export higher and stable power.Please refer to Fig. 1, its illustrate is CD driver output power of laser diode control closed loop synoptic diagram.At first, digital/analog converter (Digital Analog Converter, DAC) 10 receive digital controlled signal 12 and be converted into analog control signal 14, analog control signal 14 produces error signal 16 input offset devices 20 after subtracting each other with analog feedback signal 42, and compensator 20 can produce drive signal 22 to amplifier 25 according to error signal 16.Therefore, amplifier 25 can transition drive signal 22 become drive current 28 to laser diode (Laser Diode, LD) 30.(Front Monitor Diode, FMD) after 40 receptions, front end light detects diode 40 can output feedback signals 42 according to drive current 28 emission of lasering beam 32 and by front end light detection diode when laser diode 30.
In general, all can insert a temperature sensing component (not illustrating) in the optical read/write head of CD-ROM drive, for example thermistor (Thermistor) is monitored near the temperature of optical read/write head at any time.And writing when control in execution when CD-ROM drive, the temperature of optical read/write head periphery has considerable influence for the quality that writes CD.That is to say, under the environment of different temperatures, write CD with identical laser diode power and can produce the different effects that writes.Therefore, when the temperature change of CD driver, optical read/write head just must carry out best power to CD and proofread and correct (Optimal Power Calibration is called for short OPC) action.The best power corrective action promptly is after the temperature change of CD driver, and CD-ROM drive is found out another laser diode Writing power and carried out the action that writes CD.Otherwise, when the CD driver temperature change and the Writing power of laser diode not along with under the situation that changes, the writing quality and can reduce the perhaps failure of write activity of CD.
Yet in order to reduce the cost of manufacture of CD-ROM drive, the optical read/write head of CD-ROM drive there is no temperature sensing component is set in some specific machine.Therefore, how when carrying out the CD write activity, suitable decision CD-ROM drive is carried out and is prevented that CD from writing quality and reducing the opportunity that best power proofreaies and correct, and the perhaps failure of CD-ROM drive write activity is an important problem in fact.
Summary of the invention
The purpose of this invention is to provide a kind of CD-ROM drive decision and carry out the best power control determination methods on opportunity.When not comprising a temperature sensing component in the optical read/write head, utilize the numerical value of the drive signal of compensator to obtain the temperature of CD driver, and when arriving specified temp, carry out the best power corrective action.
The present invention proposes a kind of CD-ROM drive and carries out the determination methods that best power is proofreaied and correct opportunity, is used in the closed circuit control circuit of control output power of laser diode, and it is summarized as follows:
Receive the drive signal of compensator output; Drive signal is made analog/digital conversion in order to obtain drive signal numerical value; Utilize tracing table that drive signal numerical value is scaled temperature value; And, when this temperature value during, carry out the best power corrective action greater than specified temp.
The present invention proposes a kind of CD-ROM drive and carries out the determination methods that best power is proofreaied and correct opportunity, is used in the closed circuit control circuit of control output power of laser diode, and it is summarized as follows:
Receive the drive signal of compensator output; Drive signal is made analog/digital conversion in order to obtain drive signal numerical value; When drive signal numerical value during, carry out the best power corrective action greater than the drive signal threshold value.
The present invention also provides a kind of closed circuit control circuit of carrying out best power correction judgement on opportunity, comprising:
One digital/analog converter is used to receive and produces an analog control signal behind the digital controlled signal;
One compensator produces this drive signal after being used to receive the difference of this analog control signal and a feedback signal;
One amplifier is used to receive this drive signal and exports a drive current;
One laser diode is used to receive this drive current and produces a laser beam; And
One front end light detects diode, produces this feedback signal after being used to receive this laser beam.
In order further to understand feature of the present invention and technology contents, see also following about detailed description of the present invention and accompanying drawing, yet described accompanying drawing only provide with reference to and the explanation usefulness, be not to be used for the present invention is limited.
Description of drawings
Fig. 1 is the synoptic diagram of CD driver output power of laser diode control closed-circuit;
Fig. 2 (a) and (b) are depicted as in the CD-ROM drive drive signal and temperature sensing component output temperature signal to the synoptic diagram of time; And
Fig. 3 figure is that the process flow diagram that best power is proofreaied and correct opportunity is carried out in CD-ROM drive decision of the present invention.
The reference numeral explanation
10 numerals/revolving die is intended circuit 12 digital controlled signals
14 analog control signals, 16 error signals
20 compensators, 22 drive signals
25 amplifiers, 28 drive currents
30 laser diodes, 32 laser beam
40 front end light detect diode 42 feedback signals
Embodiment
Because the output power of CD driver laser diode is to change a digital controlled signal by firmware to control, so (Digital Analog Converter DAC) can produce analog control signal to digital controlled signal afterwards through digital/analog converter.Then, compensator (Compensator) and amplifier (Amplifier) can produce drive current and come driving laser diode output predetermined electric power.Certainly, for the power output that makes that laser diode is maintained fixed, (FrontMonitor Diode FMD) receives the laser beam that laser diode is exported, and the generation feedback signal is reached the purpose of closed circuit control must to utilize front end light to detect diode.
In general, the output power of laser diode can and reduce along with the rising of CD driver temperature.So the CD driver output power of laser diode is to be closed circuit control, it can utilize compensator to change drive signal at the size of error signal to make the stable output of laser diode meet the specified output power of digital controlled signal.That is in order to make laser diode keep stable output power, the drive signal of compensator output can raise along with the rising of temperature.
Please refer to Fig. 2 (a) and (b), its illustrate is drive signal in the CD-ROM drive and the temperature sensing component output temperature signal synoptic diagram to the time.When CD-ROM drive was carried out write activity, the temperature of CD driver can raise gradually.So according to the characteristic of temperature sensing component (thermistor), output voltage values can reduce along with the rising of temperature, in view of the above, promptly can learn the temperature in the CD-ROM drive.Moreover because the temperature of CD driver raises gradually, the drive signal of compensator output also can increase along with the increase of temperature.Therefore, according to this two curve can obtain drive signal and temperature (T1, T2 ..., T8) between relation.
Therefore, use the relation between above-mentioned drive signal and the temperature, can in the ROM (read-only memory) of CD-ROM drive, set up a tracing table (Look Up Table), the numerical value of record drive signal and the corresponding relation of temperature in this tracing table.(Analog to DigitalConVerter, ADC) drive signal of reception compensator output is learnt and the numerical value of drive signal can utilize analog/digital converter.So the CD driver temperature does not need to utilize the temperature sense assembly to learn; On the contrary, utilize tracing table and at any time the numerical value of monitoring driving signal can know the temperature of CD driver.
Therefore, please refer to Fig. 3, its illustrate is carried out the process flow diagram that best power is proofreaied and correct opportunity into CD-ROM drive decision of the present invention.
Step S1: the drive signal that receives compensator output;
Step S2: drive signal is made analog/digital conversion obtain drive signal numerical value;
Step S3: utilize a tracing table, drive signal numerical value is scaled a temperature value;
Step S4:, carry out the best power corrective action when this temperature value during greater than a specified temp.
According to above-mentioned step, the judgement that CD-ROM drive execution best power is proofreaied and correct opportunity is to utilize the tracing table that is stored in the internal memory so that drive signal numerical value is contrasted out the CD-ROM drive temperature inside, and during greater than a specified temp, carry out the best power corrective action in the CD-ROM drive temperature.
Moreover the present invention is not limited to that drive signal numerical value is converted to temperature value and whether the C.T. value decides CD-ROM drive to carry out the best power corrective action greater than a predetermined temperature.The present invention can also preset a drive signal threshold value and be stored in the ROM (read-only memory), when drive signal numerical value during greater than the drive signal threshold value, promptly represents the temperature in the CD-ROM drive too high, and this moment, CD-ROM drive must be carried out the best power corrective action.
Therefore, advantage of the present invention is to propose a kind of CD-ROM drive decision to carry out the best power control determination methods on opportunity.Utilization the present invention still can obtain the temperature of CD driver when optical read/write head does not dispose a temperature sensing component, and carries out the best power corrective action.
In sum; though the present invention discloses as above with preferred embodiment; but it is not in order to limit the present invention; anyly have the knack of this skill person; without departing from the spirit and scope of the present invention; when can being used for a variety of modifications and variations, so protection scope of the present invention is as the criterion when looking accompanying the claim person of defining.
Claims (5)
1. a CD-ROM drive is carried out the determination methods that best power is proofreaied and correct opportunity, is used in a closed circuit control circuit of control one output power of laser diode, comprises the following steps:
Receive the drive signal that one of compensator output is used for the driving laser diode;
This drive signal is made an analog/digital conversion, in order to obtain a drive signal numerical value;
Utilize a tracing table this drive signal numerical value to be scaled the temperature value of an expression CD driver temperature; And
When this temperature value during, carry out a best power corrective action greater than a specified temp.
2. CD-ROM drive as claimed in claim 1 is carried out the determination methods that best power is proofreaied and correct opportunity, and wherein, this tracing table is used to write down the relation between this drive signal numerical value and this temperature value.
3. CD-ROM drive as claimed in claim 1 is carried out the determination methods that best power is proofreaied and correct opportunity, and wherein, this tracing table is to be based upon in the ROM (read-only memory).
4. a CD-ROM drive is carried out the determination methods that best power is proofreaied and correct opportunity, is used in a closed circuit control circuit of control one output power of laser diode, comprises the following steps:
Receive the drive signal that one of compensator output is used for the driving laser diode;
This drive signal is made an analog/digital conversion in order to obtain a drive signal numerical value;
When this drive signal numerical value during, carry out a best power corrective action greater than a drive signal threshold value.
5. CD-ROM drive as claimed in claim 4 is carried out the determination methods that best power is proofreaied and correct opportunity, and wherein, this drive signal threshold value is stored in the ROM (read-only memory).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101029812A CN1307618C (en) | 2003-10-31 | 2003-10-31 | Judgment method for optical drive to perform optimal power correction timing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101029812A CN1307618C (en) | 2003-10-31 | 2003-10-31 | Judgment method for optical drive to perform optimal power correction timing |
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| Publication Number | Publication Date |
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| CN1612227A CN1612227A (en) | 2005-05-04 |
| CN1307618C true CN1307618C (en) | 2007-03-28 |
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| CNB2003101029812A Expired - Fee Related CN1307618C (en) | 2003-10-31 | 2003-10-31 | Judgment method for optical drive to perform optimal power correction timing |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001344793A (en) * | 2000-05-29 | 2001-12-14 | Sony Corp | Optical disk recording / reproducing device |
| JP2002123941A (en) * | 2000-10-16 | 2002-04-26 | Matsushita Electric Ind Co Ltd | Optical disk recording device |
| US20030072233A1 (en) * | 2001-10-16 | 2003-04-17 | Hiroki Naoi | Optical disk player |
| CN1450535A (en) * | 2002-02-21 | 2003-10-22 | 株式会社理光 | Optical disk, optical recording method, optical recording program and storage medium |
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2003
- 2003-10-31 CN CNB2003101029812A patent/CN1307618C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001344793A (en) * | 2000-05-29 | 2001-12-14 | Sony Corp | Optical disk recording / reproducing device |
| JP2002123941A (en) * | 2000-10-16 | 2002-04-26 | Matsushita Electric Ind Co Ltd | Optical disk recording device |
| US20030072233A1 (en) * | 2001-10-16 | 2003-04-17 | Hiroki Naoi | Optical disk player |
| CN1450535A (en) * | 2002-02-21 | 2003-10-22 | 株式会社理光 | Optical disk, optical recording method, optical recording program and storage medium |
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| Publication number | Publication date |
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| CN1612227A (en) | 2005-05-04 |
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