CN1301503C - Power control method capable of eliminating output power offset of read-write head of optical drive - Google Patents
Power control method capable of eliminating output power offset of read-write head of optical drive Download PDFInfo
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- CN1301503C CN1301503C CNB2005100046148A CN200510004614A CN1301503C CN 1301503 C CN1301503 C CN 1301503C CN B2005100046148 A CNB2005100046148 A CN B2005100046148A CN 200510004614 A CN200510004614 A CN 200510004614A CN 1301503 C CN1301503 C CN 1301503C
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Abstract
本发明提供一种功率控制方法，用来控制一光驱将数据写入一光盘的功率。该功率控制方法包含依据一预定程序取得一第一预定控制信号所对应的第一预定功率；输入一测试写入数据，其包含有多个第一位以及多个第二位；当接收到该多个第一位时，则启动一取样保持电路以使一读写头与一功率控制单元形成一封闭型回路；输入该第一预定控制信号以驱动该读写头输出一第一功率；以及计算该第一功率与该第一预定功率的差异值以用来校正该读写头的输出功率。
The present invention provides a power control method for controlling the power of an optical drive to write data into an optical disc. The power control method comprises obtaining a first predetermined power corresponding to a first predetermined control signal according to a predetermined program; inputting a test write data, which comprises a plurality of first bits and a plurality of second bits; when the plurality of first bits are received, activating a sampling and holding circuit so that a read/write head and a power control unit form a closed loop; inputting the first predetermined control signal to drive the read/write head to output a first power; and calculating the difference between the first power and the first predetermined power to calibrate the output power of the read/write head.
Description
Technical field
The present invention relates to a kind of Poewr control method of CD ROM reading-writing head, particularly a kind of power controlling method capable of eliminating output power deviation of CD ROM reading-writing head.
Background technology
For company or individual, the management of file or storage often are an important job.In the past, because most files all print or write on paper products, so when quantity of documents is huge,, all cause user's inconvenience easily no matter aspect volume or weight.Now along with technical development of computer, digitalized data extensively is used and is stored in the computer stored media, in order to allow user's store digital data more easily, various data memory devices also one after the other occur, and cd-recorder (Compact diskrecorder) is an example.Cd-recorder, for example can record and write formula CD-ROM drive (CD-R drive) and maybe can repeat record and write formula CD-ROM drive (CD-RW drive) and made full use of that the CD cost is low, volume is little and characteristic capacious, therefore can record and write formula CD (CD-R disk) or and can repeat record and write on the formula CD (CD-RW disk) data are recorded in one, allow the user can preserve data more easily.Generally speaking, can record write the formula CD-ROM drive with data write one can record write the formula CD before, must carry out optimum write power control (Optimum Power Control earlier, OPC) program, can record the Writing power of writing the formula CD to find out the most suitable this, and can record to write on the formula CD at this according to this Writing power and carry out the burning operation, to produce corresponding pothole (Pit) with the record binary data " 0 ", then be used for record data for the flat site of not burning " and 1 ".Write the formula CD-ROM drive to repeating record, control the Writing power of being obtained via above-mentioned optimum write power, can be used as this and can repeat to record the power of erasing of writing the formula CD-ROM drive, wherein this power of erasing be used for heating one can repeat the record write the formula CD, make the surface of its recording layer evenly be changed into flat condition once again.
See also Fig. 1, Fig. 1 can record the functional block diagram of writing formula optical power control system 10 for existing.Can record and write formula optical power control system 10 and include a controller (Controller) 12, a power control unit (Power control unit) 14, one read/write head (Pick-up head) 16 and one change-over circuit 18.Controller 12 is to be used for controlling recording the running of writing formula optical power control system 10, and power control unit 14 is to be used for adjusting read/write head 16 data are write this can to record the output power of writing the formula CD, wherein power control unit 14 includes a sample-and-hold circuit (Sample/Hold Circuit) 20, one D/A conversion circuit (Digital-to-Analog Converter, DAC) 22 and one drive circuit 24.Sample-and-hold circuit 20 is to be used for controlling forming an enclosed type loop (Close loop) or an opening loop (Open loop) between read/write head 16 and the power control unit 14; D/A conversion circuit 22 is to be used for the control signal 26 of a digital form is converted to the control voltage 28 of an analog form; Driving circuit 24 is just exported a control voltage 30 according to control voltage 28 subsequently, in order to drive the laser that read/write head 16 produces a predetermined power.Therefore, read/write head 16 is to adjust its output power according to the control voltage 30 that power control unit 14 is produced; In addition, writing data at read/write head 16 and can record in the process of writing the formula CD, also detecting the change conditions of 16 output powers of read/write head simultaneously to this.Write for the formula optical power control system 10 for recording, read/write head 16 can emission one incident pulse come this CD of etching, this incident pulse meeting forms a reflected impulse via this CD reflection, the steady state level of this reflected impulse (Reflected pulse level, the i.e. B-Level that is put down in writing in the Orange Book) is promptly represented the depth of etching CD.Then, change-over circuit 18 is to produce corresponding feedback signal 32 to power control unit 14 according to the steady state level of above-mentioned reflected impulse (real output that can be corresponding goes out read/write head 16), in order to the output power of further adjustment read/write head 16.If control signal 26 is corresponding to an optimum write power, via the enclosed type loop between read/write head 16 and the power control unit 14, can make this optimum write power of output power convergence of read/write head 16, and stably from read/write head 16 outputs.
Can record and write formula optical power control system 10 and write data to the running of CD and be summarized as follows.Because of read/write head 16 exportable laser with the record layer of etching CD with storage data, yet the formula CD is write in different recording, the character of its recording layer may produce different characteristics because of material composition own, that is laser is had different energy absorption characteristics.Therefore, beat on different CDs, may produce the etching result of degree varies when the laser of same power.In view of this, each tame manufacturer can write down the required Writing power of this CD, usually for writing fashionable reference in the Lead-In Area (Lead-in area) of CD when producing CD.And recording that each tame manufacturer produced write in the formula optical power control system 10, also can obtain being used in the th writing power P 1 of this CD usually via best power control (OPC).When this can record write formula optical power control system 10 and obtain this th writing power P 1 after, just can use this th writing power P 1 to begin to write data at the record layer of CD, according to the specification of D/A conversion circuit 22, learn the output power of read/write head 16 and the corresponding relation between the control signal 26 simultaneously with read/write head 16.For instance, when the numerical value of control signal 26 is DAC1 (that is control voltage 28 is magnitude of voltage V1), the desirable output power of read/write head 16 will be P1; Yet the output power of read/write head 16 reality is P2, and produces the feedback signal 32 that magnitude of voltage is V2 via the conversion of change-over circuit 18.Because when read/write head 16 needs this CD of etching with record data (that is record " 0 "), controller 12 can enable sample-and-hold circuit 20 so that formation one enclosed type loop between read/write head 16 and the power control unit 14.Because this moment, the magnitude of voltage V2 of feedback signal 32 was different from the magnitude of voltage V1 that controls voltage 28, so driving circuit 24 can be adjusted control voltage 30 according to magnitude of voltage V1, V2, till feedback signal 32 is identical with the magnitude of voltage of controlling voltage 28, so read/write head 16 just stably comes the etching CD with output power P1.Be with, whenever the output power of read/write head 16 is unstable and when departing from output power P1, enclosed type loop between power control unit 14 and the read/write head 16, just the output power that can adjust read/write head 16 via driving circuit 24 to be getting back to required optimum write power P1, and then the execution that the action that data are write can be correct.
Yet on side circuit, because sample-and-hold circuit 20 comprises different electronic packages such as electric capacity, so sample-and-hold circuit 20 itself also can produce interference to output signal.Under perfect condition, when sample-and-hold circuit 20 enables and makes between read/write head 16 and the power control unit 14 when forming an enclosed type loop, sample-and-hold circuit 20 can be used to keep the feedback signal 32 of (Hold) change-over circuit 18 inputs.Yet ought actually write in the operation of data, sample-and-hold circuit 20 must carry out the corresponding operation that enables and cut out according to writing data, and the signal intensity that holding circuit 20 is exported also can be subjected to sample-and-hold circuit 20 self characters and influence, that is sample-and-hold circuit 20 meeting change actual transmissions produce skew to the feedback signal 32 of driving circuit 24 so can influence the output power of read/write head 16.
See also Fig. 2 and Fig. 3, Fig. 2 is the output power synoptic diagram of read/write head 16 shown in Figure 1, and Fig. 3 is the time sequences figure of sample-and-hold circuit 20 shown in Figure 1.If when period T1, T2, T3, T4, can record and write formula CD-ROM drive 10 to need output powers be that the laser of P1 comes etching one CD to note down binary numeral " 0 ", therefore among period T1, T2, T3, the T4, sample-and-hold circuit 20 also must enable simultaneously so that form an enclosed type loop between read/write head 16 and the power control unit 14, with the output power of coming stablizing read-write head 16 via this enclosed type loop.Yet, include different electronic packages such as electric capacity because of sample-and-hold circuit 20, when sample-and-hold circuit 20 constantly enables and cuts out, above-mentioned running can influence the real output signal size of sample-and-hold circuit 20, can be offset original signal level so export the feedback signal 32 of driving circuit 24 to, and the output power of read/write head 16 just departs from predetermined value P1.For instance, suppose sample-and-hold circuit 20 permanent keep enabled state but not constantly exchange ground enable and close and the value of input control signal 26 is 100 o'clock, then control signal 26 can drive that read/write head 16 is last stably exports the laser that a power is 50mW; In addition, in carrying out the running that real data stores, if can record write formula CD-ROM drive 10 inputs one value be 100 control signal 26 to D/A conversion circuit 22, control signal 26 can be converted into corresponding control voltage 28, its value is V1.Yet when read/write head 16 when coming into operation, may because self character and only output power be the laser of 45mW, therefore when read/write head 16 detected the pulse signal of this CD reflection, this pulse signal then was converted to a feedback signal 32 via change-over circuit 18, and its magnitude of voltage is V2.
When feedback signal 32 input sample-and-hold circuits 20, and when adjusting the output power of read/write head 16 by this enclosed type loop, owing to sample-and-hold circuit 20 can be because constantly enable and cut out to influence feedback signal 32 to exchange, when if sample-and-hold circuit 20 makes the magnitude of voltage of feedback signal 32 be offset to V1 (but not original magnitude of voltage V2), for driving circuit 24, because this moment, sample-and-hold circuit 20 was identical with the output of D/A conversion circuit 22, therefore the output power of read/write head 16 can not adjusted by driving circuit 24, so the laser that read/write head 16 can stable output 45mW and non-required output power 50mW.Significantly, because the influence of sample-and-hold circuit 20, to produce an offset value delta p between the intended power output P1 of read/write head 16 and real output P2 (certainly and make, according to the circuit characteristic of sample-and-hold circuit 20 own, the real output P2 that also may make read/write head 16 is greater than intended power output P1).Therefore ought actually carry out in the operation that data write, though can record and write formula CD-ROM drive 10 and can use the control signal 26 of corresponding best power (producing) to drive read/write head 16 via the OPC program, because sample-and-hold circuit 20 can make the real power of read/write head 16 be offset this best power, so can influence the etching degree of CD and then influence stored data, so when this CD is desired to carry out data read, may influence the interpretation of data because of wrong etch depth.
Can repeat record and write for the formula CD-ROM drive for existing, this can repeat record and write the formula CD-ROM drive and can be used to can to repeat to record writing optical disk (CD-RW disk) to one and carry out data and write the operation of erasing with data, therefore this can repeat to record the read/write head of writing the formula CD-ROM drive need a Writing power with carry out at this CD etching produce pothole and erase power be used for eliminating data on the CD (that is this power of erasing is the recording layer that is used for heating this CD so that its surperficial homogenising and reach the purpose of eliminating data).Have now as industry, this can repeat to record the framework that the formula CD-ROM drive of writing is exported this power of erasing, the framework of writing formula CD-ROM drive 10 output Writing powers with shown in Figure 1 recording is identical, be to stablize its read/write head via an enclosed type loop to export this power of erasing equally, that is utilize this power of erasing to produce a plane (Land) at this CD, and this can repeat record and writes the formula CD-ROM drive and also can start its sample-and-hold circuit to form this enclosed type loop.So write formula CD-ROM drive 10 as recording, carry out in the operation that data write actual, though can repeating to record the formula CD-ROM drive of writing, this is to use control signal to drive read/write head to the power of should being scheduled to erase, yet, therefore also can influence the real data storage on this CD because sample-and-hold circuit also can make read/write head produce to erase power that the phenomenon of skew takes place.
Summary of the invention
Therefore one of fundamental purpose of the present invention is to provide a kind of Poewr control method of output power deviation of recoverable CD ROM reading-writing head, be when this read/write head carries out the real data burning at a CD, can avoid this output power to be offset, to promote the accuracy of this read/write head storage data on this CD, in order to solve the problem that above-mentioned prior art faces.
Preferred embodiment of the present invention provides a kind of control CD-ROM drive (Optical disk drive) that data are write the Poewr control method of a CD, and wherein this CD-ROM drive includes a read/write head (Pick-up head), is used for writing data to this CD; One change-over circuit is used for producing a feedback signal according to the output power of this read/write head; And a power control unit, be used for adjusting the output power of this read/write head.This power control unit includes a sample-and-hold circuit (Sample/hold circuit), be used for controlling this feedback signal and whether feed back (Feed back) to this power control unit, an and D/A conversion circuit (Digital-to-Analog Converter, DAC), be used for according to control signal output one control voltage to adjust the output power of this read/write head.
The Poewr control method of preferred embodiment of the present invention comprises carries out a preset program, to obtain this read/write head data is write the first required predetermined power of this CD, and wherein this first predetermined power is corresponding with first predetermined control signal; Input one test writes data, and it includes a plurality of first with first current potential, and a plurality of second with second current potential; A plurality of when having first of first current potential when receiving this, then start this sample-and-hold circuit so that this read/write head and this power control unit form an enclosed type loop (Close loop), and this first predetermined control signal is imported this D/A conversion circuit export one first power to drive this read/write head; And the difference value of calculating this first power and this first predetermined power.When this CD-ROM drive is carried out this preset program, and when obtaining this read/write head data being write pairing second predetermined control signal of the second required predetermined power of this CD, then adjust this second predetermined power according to this difference value, so that corresponding one the 3rd predetermined power of this second predetermined control signal, and the difference of this first power and this first predetermined power promptly equals the poor of this second predetermined power and the 3rd predetermined power.
Description of drawings
Fig. 1 can record the functional block diagram of writing the formula CD-ROM drive for existing.
Fig. 2 is the output power synoptic diagram of read/write head shown in Figure 1.
Fig. 3 is the time sequences figure of sample-and-hold circuit shown in Figure 1.
Fig. 4 is the process flow diagram of Poewr control method of the present invention.
Fig. 5 is the characteristics of output power synoptic diagram that read/write head shown in Figure 1 is used Poewr control method of the present invention.
The reference numeral explanation
10 can record and write formula optical power control system 12 controllers
14 power control units, 16 read/write heads
18 change-over circuits, 20 sample-and-hold circuits
22 D/A conversion circuits, 24 driving circuits
26 control signals, 28,30 control voltages
32 feedback signals, 40 family curves
Embodiment
Please consult Fig. 1, Fig. 4 and Fig. 5 simultaneously, wherein Fig. 4 is the process flow diagram of Poewr control method of the present invention, and Fig. 5 is the characteristics of output power synoptic diagram that read/write head 16 shown in Figure 1 is used Poewr control method of the present invention.Poewr control method of the present invention is to continue to enable sample-and-hold circuit 20 (step 102) in one first test duration, so that form an enclosed type loop between read/write head 16 and the power control unit 14, and the output terminal of sample-and-hold circuit 20 can keep the signal of (Hold) its input end.On the other hand, control signal 26 (DAC1 shown in Figure 5) also is input to D/A conversion circuit 22 (step 104), and via D/A conversion circuit 22 control signal 26 of digital format is converted to the control voltage 28 of analog format, and the control voltage 28 of analog format is input to driving circuit 24 subsequently.Next, driving circuit 24 can produce a control voltage 30 with driving read/write head 16 (step 106), and read/write head 16 also can detect its output power (step 108), that is P1 shown in Figure 5.Then, the method for preferred embodiment will write data according to a test and continuously enable and close sample-and-hold circuit 20 (step 110) in one second test duration.For instance, import one eight to 14 modulations (Eight-to-Fourteen Modulation, EFM) data are write formula CD-ROM drive 10 to can recording, these eight to 14 modulation data are to be a bit stream (Bit stream), and include a plurality of digit order numbers " 0 " with " 1 ".Write formula optical power control system 10 to recording, desire stores " 1 " time, sample-and-hold circuit 20 is for cutting out; And store when desire " 0 " time, sample-and-hold circuit 20 is for enabling, therefore in this second test duration, sample-and-hold circuit 20 can enable and cuts out according to these eight to 14 modulation data.When sample-and-hold circuit 20 enables, this control signal 26 (DAC1 shown in Figure 5) will be fed into D/A conversion circuit 22 (step 112), and D/A conversion circuit 22 can be converted to the control signal 26 of digital format the control voltage 28 of analog format, the control voltage 28 of this analog format is input to driving circuit 24 subsequently, and driving circuit 24 then can produce a control voltage 30 to drive read/write head 16 (step 114).In addition, read/write head 16 also can detect its output power (step 116), that is P1 ' shown in Figure 5.
As previously mentioned, when sample-and-hold circuit 20 constantly enabled according to data and cuts out, the circuit characteristic that the real output P1 ' of read/write head 16 can be subjected to sample-and-hold circuit 20 influenced and is offset.In Fig. 5, be to be P1 with the predetermined power, and the side-play amount (Offset) of real output P1 ' and predetermined power P1 is Δ P (step 118), therefore can learn the influence degree of sample-and-hold circuit 20 for the output power of read/write head 16 via above-mentioned test.Significantly, write formula optical power control system 10 and when writing the recording layer of data to a CD, just can use this offset P to proofread and correct the output power (step 120) of a corresponding control signal when recording actual.
For instance, write capability correction district (the Power Calibration Area of formula optical power control system 10 on a CD when recording, PCA) carry out the best power timing, sample-and-hold circuit 20 is to form an enclosed type loop for enabling read/write head 16 with power control unit 14, can record the read/write head 16 of writing formula optical power control system 10 then and can read an indication optimum write power (Indicative optimum writing power) from the Lead-In Area (Lead-in area) on the CD, wherein indicating optimum write power is to make the Writing power that this kind CD is advised being fit to by CD manufacturer.Thereafter, read/write head 16 can be with less than seven Writing powers of indication optimum write power, this indication optimum write power and greater than seven Writing powers of indication optimum write power, 15 Writing powers altogether, the action that 15 continuous test block (Block) of test section on CD (Test area) are tried to write, if it is P2 that best power is proofreaied and correct resulting optimum write power, its corresponding control signal 26 is DAC2.Yet when actual when carrying out operation that data write, sample-and-hold circuit 20 can influence the pairing output power P2 of control signal 26 (DAC2), so present embodiment learns that by above-mentioned offset P the real output of read/write head 16 is to be P2 ' (that is P2-Δ P).
In addition, present embodiment also can be obtained the family curve 40 of read/write head 16 under sample-and-hold circuit 20 influences according to value DAC1, DAC2 and actual output power P1 ', the P2 ' of control signal 26, its expression can be recorded and be write formula CD-ROM drive 10 actual when writing data to a CD-ROM drive, the Writing power of read/write head 16 outputs and the funtcional relationship between the control signal.So by family curve shown in Figure 5 40 as can be known, when Writing power was P2, required control signal 26 was DAC3.Generally speaking, the same record write in the formula CD-ROM drive 10, and sample-and-hold circuit 20 is for the influence degree convergence certain value (offset P) of read/write head 16, therefore, present embodiment can be via the result of twice test, that is (DAC1, P1 ') comes one family curve 40 of construction apace with (DAC2, P2 ').Yet after also can carrying out a plurality of tests, utilize the mode of existing polynomial curve approximate (Polynomial curve fitting) to produce family curve 40, perhaps enable sample-and-hold circuit 20 earlier, and by the test write formula CD-ROM drive 10 behind the family curve under the sample-and-hold circuit 20 permanent enabled state to obtain to record, produce family curve 40 by this offset P with translation mode, for example earlier via (DAC1, P1) with (DAC2, P2) or more test results, obtain one with reference to family curve (curve 60 for example shown in Figure 5) in the approximate mode of existing polynomial curve, this is family curve 40 grades with reference to family curve and does not break away from the equivalence change that preferred embodiment spirit does with the downward translation of this offset P (Shift) then, all belongs to category of the present invention.
Similarly, write for the formula CD-ROM drive for repeating record, the control of its power of erasing is with can to record the Writing power control of writing formula CD-ROM drive 10 identical, writes the formula CD-ROM drive and needs with the power record numerical value of erasing when repeating record " 0 " time, its sample-and-hold circuit similarly can enable to produce an enclosed type loop; And write formula CD-ROM drive need with Writing power record numerical value when repeating record " 1 " time, its sample-and-hold circuit then can cut out.Therefore for a storage data, can repeat to record the sample-and-hold circuit of writing the formula CD-ROM drive also must produce corresponding enable with shutoff operation to note down " 0 " and " 1 ".And have now as industry, this Writing power is to produce according to this power of erasing, therefore Poewr control method of the present invention also can be applicable to repeat record and writes the formula CD-ROM drive, to erase during this CD actual, adjust of the influence of this sample-and-hold circuit for the power of erasing, and can be according to the invention described above Poewr control method, obtain the family curve between adjusted erase power and the corresponding control signal.No matter so be to record the formula CD-ROM drive of writing to repeat maybe that the formula CD-ROM drive is write in record or so-called equivalence is modified based on preferred embodiment spirit of the present invention, all belong to category of the present invention and should be covered by in the present patent application claim.
Compared to prior art, Poewr control method of the present invention is the sample-and-hold circuit that enables a CD-ROM drive earlier, and import a control signal to drive a read/write head, this read/write head detects a corresponding intended power output simultaneously, import a test then and write data to this CD-ROM drive, and according to this control signal to order about the store operation of these CD-ROM drive artificial actual data, write the formula CD-ROM drive to recording, this control signal is corresponding to a Writing power, and write the formula CD-ROM drive to repeating record, this control signal is corresponding to the power of erasing, therefore this sample-and-hold circuit can write data and produce the corresponding running that enables and cut out simultaneously according to this test, this read/write head detects a real output simultaneously, utilize this intended power output and this real output to obtain a power offset values, this power offset values is to be this sample-and-hold circuit influence degree to this read/write head in the operating process that real data stores, so Poewr control method of the present invention just can utilize this power offset values to revise the intended power output of the corresponding control signal of this read/write head and obtain a real output, Poewr control method of the present invention also can produce a family curve with the corresponding real output of this read/write head according to this control signal simultaneously, therefore by this family curve, this CD-ROM drive can be promptly learnt required control signal size according to required Writing power (can record and write the formula CD-ROM drive) or the power of erasing (can repeat record and write the formula CD-ROM drive), therefore the data storing efficient that can promote this CD-ROM drive.
The above only is preferred embodiment of the present invention, and all equalizations of being done according to the present patent application claim change and modify, and all should belong to covering scope of the present invention.
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100046148A CN1301503C (en) | 2005-01-14 | 2005-01-14 | Power control method capable of eliminating output power offset of read-write head of optical drive |
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| CNB2005100046148A CN1301503C (en) | 2005-01-14 | 2005-01-14 | Power control method capable of eliminating output power offset of read-write head of optical drive |
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| CN1652220A CN1652220A (en) | 2005-08-10 |
| CN1301503C true CN1301503C (en) | 2007-02-21 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI289844B (en) | 2004-12-31 | 2007-11-11 | Via Tech Inc | Power control method for eliminating output power offset of a pick-up head in an optical disk drive |
| CN100479049C (en) * | 2006-10-09 | 2009-04-15 | 威盛电子股份有限公司 | Method for selecting input point of correction program |
| US8711664B2 (en) * | 2010-06-21 | 2014-04-29 | Mediatek Inc. | Method of controlling mechanical mechanisms of optical storage apparatus for peak power/current reduction, and related optical storage apparatus and machine-readable medium |
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| CN1405764A (en) * | 2002-10-16 | 2003-03-26 | 威盛电子股份有限公司 | Power control circuit of optical information recording device |
| JP2004327020A (en) * | 2003-04-08 | 2004-11-18 | Matsushita Electric Ind Co Ltd | Laser power control method and laser power control device |
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