CN1294578C - Method for judging regulation occasion of executing writing strategy by CD machine - Google Patents
Method for judging regulation occasion of executing writing strategy by CD machine Download PDFInfo
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- CN1294578C CN1294578C CNB2004100302169A CN200410030216A CN1294578C CN 1294578 C CN1294578 C CN 1294578C CN B2004100302169 A CNB2004100302169 A CN B2004100302169A CN 200410030216 A CN200410030216 A CN 200410030216A CN 1294578 C CN1294578 C CN 1294578C
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Abstract
The present invention relates to a method for judging regulation occasion of executing writing strategy in CD machines. The present invention utilizes a look up table stored in a memory to record the relationship between a value of an output signal and temperature; the value of an output signal of a compensator can be collated with the temperature in the CD machine according to the look up table, when the temperature is higher than the certain temperature, the CD machine executes the regulation of the writing strategy.
Description
Technical field
The invention relates to the control of CD-ROM device inner laser diode output power, and particularly carry out the determination methods that write-in policy is adjusted opportunity relevant for a kind of CD-ROM device.
Background technology
Laser diode in the CD-ROM device is arranged at the light source that is used as the read-write CD-RW discsCD-RW on the optical read/write head.And when CD-ROM device was carried out write activity, laser diode must continue to export higher and stable power.Please refer to Fig. 1, it is shown to be CD-ROM device inner laser diode output power control closed loop synoptic diagram.At first, the numeral revolving die is intended circuit (Digital Analog Converter, DAC) 10 receive digital control signal 12 and be converted into simulation controlling signal 14, simulation controlling signal 14 is feedback with simulation and is produced error signal 16 input offset devices 20 after signal 42 subtracts each other, and compensator 20 can produce output signal 22 to amplifier 25 according to error signal 16.Therefore, amplifier 25 can be changed output signal 22 becomes drive current 28 to laser diode (Laser Diode, LD) 30.(Front Monitor Diode, FMD) after 40 receptions, front end light detects diode 40 can reset signals 42 according to drive current 28 emission laser beams 32 and by front end light detection diode when laser diode 30.
Please refer to Fig. 2, its shown write-in policy synoptic diagram that is CD-ROM device at the video disc (Rewritable-Disk) of can erasing.In general, the material behavior of disc recording layer owing to can erase, eight change 14 modulations (Eight to Fourteen Modulation, hereinafter to be referred as EFM) signal must be converted into high-frequency signals (the High Frequency of pulse wave form, hereinafter to be referred as HF), and the HF signal extremely can be used for the laser beam of driving laser diode output pulsed, so, could form the secretly record information of (Pit), bright (Land) on the track of recording layer.For instance, according to the specifications of the CD-RW discsCD-RW of can erasing, the EFM signal is the signal of 3T to 11T.When the EFM signal was 3T, the HF signal had 2 pulse waves.
In general, all can insert a temperature sensor in the optical read/write head of CD-ROM device, 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 device, the temperature of optical read/write head periphery has considerable influence for the quality that writes CD-RW discsCD-RW.That is to say that following at the environment of different temperatures comes the driving laser diode can produce the different effects that writes with identical HF signal.Therefore, when the CD-ROM device temperature inside changed, optical read/write head just must be adjusted the write-in policy of CD-ROM device.
The adjustment action of write-in policy is after the CD-ROM device temperature inside changes, and the pulse bandwidth that CD-ROM device changes the HF signal comes the driving laser diode, and carries out the action that writes CD-RW discsCD-RW.Otherwise, when the CD-ROM device internal temperature changes and under the situation that the HF signal of driving laser diode does not change with work, the writing quality and can reduce the perhaps failure of write activity of CD-RW discsCD-RW.In general, when the rising of CD-ROM device temperature inside, the pulse bandwidth of HF signal (Pulse Width) must narrow down, and so, could obtain preferable record information on CD-RW discsCD-RW.
Yet in order to reduce the cost of manufacture of CD-ROM device, the optical read/write head of CD-ROM device there is no temperature sensor is set in some specific machine.Therefore, how when carrying out the CD-RW discsCD-RW write activity, the write-in policy adjustment of suitable decision CD-ROM device prevents that CD-RW discsCD-RW from writing quality and reducing opportunity, and the perhaps failure of CD-ROM device write activity is an important problem in fact.
Summary of the invention
The object of the present invention is to provide a kind of CD-ROM device to carry out the determination methods that write-in policy is adjusted opportunity.When not comprising a temperature sensor in the optical read/write head, utilize the numerical value of the output signal of compensator to obtain the CD-ROM device temperature inside, and when arriving specified temp, carry out write-in policy adjustment action.
A kind of CD-ROM device that the present invention proposes is carried out the determination methods that write-in policy is adjusted opportunity, is used in one of control one output power of laser diode and closes back control circuit, comprises the following steps:
Receive an output signal of compensator output;
This output signal is made an analog/digital conversion in order to obtain an output signal numerical value;
Utilize comparison list that this output signal numerical value is scaled a temperature value; And
When this temperature value during, carry out write-in policy adjustment action greater than a specified temp.
Wherein this table of comparisons system this output signal numerical value of record and this temperature value between relation.
Wherein this table of comparisons is one only to read reservoir.
Wherein this closed loop control circuit comprises:
One digital revolving die is intended circuit, produces a simulation controlling signal after receiving a digital control signal;
This compensator receives this simulation controlling signal and and feedbacks and to produce this output signal after the difference of signal;
One amplifier receives this output signal and exports a drive current;
This laser diode receives this drive current and produces a laser beam; And
One front end light detects diode, produces this back coupling signal after receiving this laser beam.
The present invention also proposes a kind of CD-ROM device and carries out the determination methods that write-in policy is adjusted opportunity, is used in one of control one output power of laser diode and closes back control circuit, comprises the following steps:
Receive an output signal of compensator output;
This output signal is made an analog/digital conversion in order to obtain an output signal numerical value;
When this output signal numerical value during, carry out write-in policy adjustment action greater than an output signal threshold value.
Wherein this output signal threshold value is stored in one and only reads reservoir.
Wherein this closed loop control circuit comprises:
One digital revolving die is intended circuit, produces a simulation controlling signal after receiving a digital control signal;
This compensator receives this simulation controlling signal and and feedbacks and to produce this output signal after the difference of signal;
One amplifier receives this output signal and exports a drive current;
This laser diode receives this drive current and produces a laser beam; And
One front end light detects diode, produces this back coupling signal after receiving this laser beam.Be used in the control circuit that closes back of control output power of laser diode, it is summarized as follows:
Receive the output signal of compensator; Output signal is made analog/digital conversion in order to obtain output signal numerical value; Utilize the table of comparisons that output signal numerical value is scaled temperature value; And, when this temperature value during, carry out write-in policy adjustment action greater than specified temp.
Description of drawings
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 accompanying drawing only provide with reference to and the explanation usefulness, be not to be used for the present invention is limited.
Fig. 1 is shown to be CD-ROM device inner laser diode output power control closed loop synoptic diagram;
The shown write-in policy synoptic diagram that is CD-ROM device at the video disc of can erasing of Fig. 2;
Fig. 3 a, 3b are shown be in the CD-ROM device output signal and temperature sensor output temperature signal to the synoptic diagram of time; And
The shown process flow diagram of adjusting opportunity for CD-ROM device decision execution write-in policy of the present invention of Fig. 4.
Embodiment
Because the output power of CD-ROM device inner laser diode is to change a digital control signal by firmware to control.Digital control signal is intended circuit through digital revolving die, and (Digital Analog Converter DAC) can produce the simulation controlling signal afterwards.Now, compensator (Compensator) can produce drive current with amplifier (Amplifier) and come driving laser diode output predetermined electric power.Certainly, for the power output that makes that laser diode is maintained fixed, (Front Monitor Diode FMD) receives the laser beam that laser diode is exported, and generation back coupling signal is reached the purpose of closed loop control must to utilize front end light to detect diode.
In general, the output power of laser diode can raise with work CD-ROM device internal temperature and reduce.So CD-ROM device inner laser diode output power is closed loop control, it can utilize compensator to change output signal at the size of error signal to make the stable output of laser diode meet the specified output power of digital control signal.That is in order to make laser diode keep stable output power, the output signal of compensator output can raise with the rising of work temperature.
Please refer to Fig. 3 a, 3b, it is shown be in the CD-ROM device output signal and temperature sensor output temperature signal to the synoptic diagram of time.When CD-ROM device was carried out write activity, the CD-ROM device temperature inside can raise gradually.So according to the characteristic of temperature sensor (thermistor), output voltage values can reduce with the rising of work temperature, so basis, promptly can learn the temperature in the CD-ROM device.Moreover because the CD-ROM device temperature inside raises gradually, the output signal of compensator output can also can increase with the work temperature.Therefore, according to this two curve can obtain output signal and temperature (T1, T2 ..., T8) between relation.
Therefore, use the relation between above-mentioned output signal and the temperature, can set up comparison list (Look Up Table), the numerical value of record output signal and the corresponding relation of temperature in this table of comparisons at the reservoir of only reading of CD-ROM device.(Analog toDigital Converter, ADC) output signal of reception compensator output is learnt and the numerical value of output signal can utilize analog/digital converter.So the CD-ROM device internal temperature does not need to utilize temperature sensitive member to learn; On the contrary, the numerical value that utilizes the table of comparisons also to monitor output signal at any time can be known the CD-ROM device temperature inside.
Therefore, please refer to Fig. 4, its shown process flow diagram of adjusting opportunity for CD-ROM device decision execution write-in policy of the present invention.
Step S1: the output signal that receives compensator;
Step S2: output signal is made analog/digital conversion obtain output signal numerical value;
Step S3: utilize comparison list, output signal numerical value is scaled a temperature value;
Step S4:, carry out write-in policy adjustment action when this temperature value during greater than a specified temp.
According to above-mentioned step, the judgement that CD-ROM device execution write-in policy is adjusted opportunity is to utilize the table of comparisons and the record output signal numerical value that are stored in the reservoir to contrast out the CD-ROM device temperature inside, and during greater than a specified temp, carry out write-in policy adjustment action in the CD-ROM device temperature.
Moreover the present invention is not limited to that output signal numerical value is converted to temperature value and whether the C.T. value decides CD-ROM device to carry out write-in policy adjustment action greater than a predetermined temperature.The present invention can also preset an output signal threshold value and be stored in and only read in the reservoir, when output signal numerical value during greater than the output signal threshold value, promptly represents temperature too high this moment of the CD-ROM device in the CD-ROM device must carry out write-in policy adjustment action.
Therefore, advantage of the present invention is to propose a kind of CD-ROM device decision to carry out the determination methods that write-in policy is adjusted opportunity.Utilization the present invention still can not obtain the CD-ROM device temperature inside when optical read/write head disposes a temperature sensor, and carries out write-in policy adjustment action.
In sum; though the present invention describes as above with preferred embodiment; right its is not in order to limit the present invention; anyly have the knack of this technician; 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 enclosed being as the criterion of being defined when the claim that look application.
Claims (6)
1. a CD-ROM device is carried out the determination methods that write-in policy is adjusted opportunity, is used in one of control one output power of laser diode and closes back control circuit, comprises the following steps:
Receive an output signal of compensator output;
This output signal is made an analog/digital conversion in order to obtain an output signal numerical value;
Utilize comparison list that this output signal numerical value is scaled a temperature value; And
When this temperature value during, carry out write-in policy adjustment action greater than a specified temp;
Wherein this table of comparisons writes down the mutual relationship between a plurality of output signal numerical value and a plurality of temperature value, makes this output signal to find out corresponding this temperature value according to this table of comparisons.
2. CD-ROM device as claimed in claim 1 is carried out the determination methods that write-in policy is adjusted opportunity, it is characterized in that, wherein this table of comparisons is stored in one and only reads in the reservoir.
3. CD-ROM device as claimed in claim 1 is carried out the determination methods that write-in policy is adjusted opportunity, it is characterized in that wherein this closed loop control circuit comprises:
One digital revolving die is intended circuit, produces a simulation controlling signal after receiving a digital control signal;
This compensator receives this simulation controlling signal and and feedbacks and to produce this output signal after the difference of signal;
One amplifier receives this output signal and exports a drive current;
This laser diode receives this drive current and produces a laser beam; And
One front end light detects diode, produces this back coupling signal after receiving this laser beam.
4. a CD-ROM device is carried out the determination methods that write-in policy is adjusted opportunity, is used in one of control one output power of laser diode and closes back control circuit, comprises the following steps:
Receive an output signal of compensator output;
This output signal is made an analog/digital conversion in order to obtain an output signal numerical value;
When this output signal numerical value during, carry out write-in policy adjustment action greater than an output signal threshold value.
5. CD-ROM device as claimed in claim 4 is carried out the determination methods that write-in policy is adjusted opportunity, it is characterized in that wherein this output signal threshold value is stored in one and only reads reservoir.
6. CD-ROM device as claimed in claim 4 is carried out the determination methods that write-in policy is adjusted opportunity, it is characterized in that wherein this closed loop control circuit comprises:
One digital revolving die is intended circuit, produces a simulation controlling signal after receiving a digital control signal;
This compensator receives this simulation controlling signal and and feedbacks and to produce this output signal after the difference of signal;
One amplifier receives this output signal and exports a drive current;
This laser diode receives this drive current and produces a laser beam; And
One front end light detects diode, produces this back coupling signal after receiving this laser beam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100302169A CN1294578C (en) | 2004-03-22 | 2004-03-22 | Method for judging regulation occasion of executing writing strategy by CD machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100302169A CN1294578C (en) | 2004-03-22 | 2004-03-22 | Method for judging regulation occasion of executing writing strategy by CD machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1674120A CN1674120A (en) | 2005-09-28 |
| CN1294578C true CN1294578C (en) | 2007-01-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2004100302169A Expired - Fee Related CN1294578C (en) | 2004-03-22 | 2004-03-22 | Method for judging regulation occasion of executing writing strategy by CD machine |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1409301A (en) * | 2001-09-25 | 2003-04-09 | Lg电子株式会社 | Method for signal recording in recording medium |
| JP2003187448A (en) * | 2001-12-18 | 2003-07-04 | Sony Corp | Optical disk recording apparatus |
| JP2003331427A (en) * | 2002-05-15 | 2003-11-21 | Matsushita Electric Ind Co Ltd | Optical information recording and reproducing device |
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2004
- 2004-03-22 CN CNB2004100302169A patent/CN1294578C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1409301A (en) * | 2001-09-25 | 2003-04-09 | Lg电子株式会社 | Method for signal recording in recording medium |
| JP2003187448A (en) * | 2001-12-18 | 2003-07-04 | Sony Corp | Optical disk recording apparatus |
| JP2003331427A (en) * | 2002-05-15 | 2003-11-21 | Matsushita Electric Ind Co Ltd | Optical information recording and reproducing device |
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| Publication number | Publication date |
|---|---|
| CN1674120A (en) | 2005-09-28 |
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Granted publication date: 20070110 Termination date: 20140322 |