CN101213599A - Track writing with radial error offset correction - Google Patents
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- CN101213599A CN101213599A CNA2006800237006A CN200680023700A CN101213599A CN 101213599 A CN101213599 A CN 101213599A CN A2006800237006 A CNA2006800237006 A CN A2006800237006A CN 200680023700 A CN200680023700 A CN 200680023700A CN 101213599 A CN101213599 A CN 101213599A
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- 238000004590 computer program Methods 0.000 claims description 4
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Abstract
The present invention relates to a method and apparatus for writing data on a record carrier (1) by using a radiation beam, wherein at least one of a writing power and an asymmetry of data written on the record carrier (1) is determined and a radial error offset, applied to the radiation beam with respect to a writing track of the record carrier (1), is controlled in response to at least one of the determined writing power and the determined asymmetry. Thereby, the radial error offset can be linked to at least one of the applied writing power and the obtained asymmetry of the written data, and can thus be altered before or during writing to maintain reasonable tracking in cases where writing is done on record carriers with variable radial error offset.
Description
Invention field
The present invention relates to a kind of by utilizing radiation beam that data are write on wiring method and device on the record carrier, described record carrier such as CD.Particularly, the present invention relates to the control function that writes in disc drive unit.
Background technology
In order on record carrier or data storage medium, to read or to write, radiation beam must be focused on this medium, described data storage medium is optical data storage media for example, and as CD (compact disc) or DVD (digital universal disc), described radiation beam is radiation beam for example.Effective light path from the condenser lens to the record surface must remain unchanged.In order to realize foregoing, must make this condenser lens near this record surface, for example by means of the actuator that carries this condenser lens.This actuator is the part of servo loop, and by electric current it is driven, and described electric current gets from focus error signal (FES), and the light that this focus error signal (FES) reflects from memory carrier and getting, described memory carrier is CD for example.In crooked (vibration) and variation in thickness (after wherein two cause so-called axial runout and compensate the accelerated motion of a plurality of parts in the system that causes owing to for example physical shock, at a certain initial time, this servo loop closure, and this radiation beam is always kept in focus on this medium.
The laser power that is used for recordable or rewritable dish is write required correct number is variable, and depends on each register, dish, even depends on the ad-hoc location on the dish sometimes.Various types of dyestuffs used in this dish are owing to its physical composition has the power window of different size, and therefore need the laser power of varying number for normal recordings.Power window refers to range of laser energy, and it will suitably form the mark of just size on dish, and it not only can change between used dye type, but also depends on the speed that dish is write down.Power is too high will to form oversize mark, and these are oversize, and be marked at when being read can be physically and in fact interfering with each other.Power is too low will to form undersized mark, and the signal level that reduces may cause read failure under extreme case in replayed section.
Therefore, before beginning, all registers all will carry out initial optimum power calibration (OPC) thereby program writes the laser power setting for each dish and the definite the best of the combination of register.This OPC process start from this register from the introducing district of dish in the preceding groove of having encoded absolute time (ATIP) information retrieval be used for the optimal recording power estimated value of the initial recommendation of specific Writing condition.But the ATIP section exists only on the recordable CD (for example CD-R/RW medium), and can comprise the type and the additional information of the makers' title of medium, dish.The auxiliary byte (aux_bytes) that to use after DVD and BD (Blu-ray disc) medium have.Utilize this to be provided as starting point, register progressively carries out higher and lower laser power setting, simultaneously special retaining space before being arranged in the introducing district of dish, that be called the dish of power calibration area (PCA) writes detecting information, thereby this PCA is positioned at and carries out opc test and find out the position that optimal laser power is provided with for writing laser and write-in policy.
In so-called " walking " OPC scheme, after writing test badge with different laser powers, this register these test badges that read back, and seek length poor of mark and ridge.These length differences of mark and ridge are called " asymmetric " or " β ".Negative β represents the average power deficiency (too short) of these marks, and positive β represents power strong excessively (oversize).For widely with various available medium type compatibilities, register uses+4% β (for example be used in the orange paper part ii standard of CD medium advises) traditionally, but some unit have a plurality of target beta and write-in policy (in fact the orange paper of latest edition has stipulated use specific objective β and write-in policy) now.Therefore register determines which kind of setting can realize desirable β target, and it is asserted the recording power of this dish.
In initial OPC program, register is also monitored the reflected light that reflects from this dish, and these marks are forming and storing this information simultaneously.After definite which kind of power setting produced desirable β, this recorder retrieves reflected signal associated therewith was set up mark and is formed signature, and it is stored in its storer.In recording process, when utilizing reflected light on dish, to form mark, these marks of this system monitoring, and this system compares these signals and the signature of setting up in initial OPC program.In whole ablation process, adjust laser power then to keep its top condition.
But, on recordable disc medium, write the as easy as rolling off a log influence that is activated the little variation of device and medium such as the DVD+R medium, therefore any improvement of write performance although be very little improvement, all is very important for form more or bigger surplus in system.
Fig. 2 illustrates the schematic structure of regular DVD-dual layer+R dish, wherein is used to the laser that the writes upper surface by last substrate 22 and enters.This dual layer discs needs 24,30 and two reflection horizon 26,32 of two recording layers.As shown in Figure 2, layer structure comprises last substrate 22, first recording layer (L0) 24, the translucent reflective layer 26 that has groove, intermediate isolating layer 28, second recording layer 30, reflection horizon 32 and the virtual substrate 34 that has groove.
With wherein different by all layers being stacked on this " hierarchical system " of making dish on the substrate, developed new so-called " inverted stack system " or " contrary stacked model ", wherein make first dish and second dish at first independently, described first dish comprises above-mentioned substrate 22 and the above-mentioned translucent reflective layer 26 of going up, and described second dish comprises above-mentioned second recording layer 30 and the following substrate,, then first dish and second dish are adhered to each other to obtain single bilayered dish.
Fig. 3 illustrates the schematic structure of the DVD-dual layer+R dish according to inverted stack system, and the laser that wherein is used to write also enters by the upper surface of last substrate 22.In Fig. 3, this layer structure comprises last substrate 22, first recording layer (L0) 24, translucent reflective layer 26 and the intermediate isolating layer 28 that has groove, but this intermediate isolating layer does not have any groove.Opposite with regular dual layer discs, this special dual layer discs comprises additional protection layer 36, is second recording layer 38, reflection horizon 40 and the following substrate 42 that has groove subsequently.
Some advantages of this inverted stack system are to carry out concurrently the manufacturings of first and second dishes up to adhesion process, and this allows a large amount of production, and it is also advantageous in that can be at lower cost and high-durability ground utilizes the metal stamping and pressing of routine.In addition, owing to can make first and second dishes independently, and at the end of this process it is adhered to, therefore can improve measuring accuracy significantly.
On the other hand, according to producing swing (helicla flute) required for each recording layer between substrate 22 on the mode identical with single-layered disk is in first dish and first recording layer (L0) 24.On the other hand, in second dish, must between reflection horizon 40 and following substrate 42, produce swing.This has caused the different structure of first dish and second dish, and needs advanced design technology.In addition, the swing in second dish is positioned at apart from farthest that of pickup unit, and this pickup unit generates and writes laser, thereby makes second dish need more precipitous and more accurate groove to form and high-precision pressing mold.
Known radial tracking error detection method comprises the push-pull type radial tracking, wherein in the signal difference of independently measuring on the detecting device separately between two 1/2nd pupils; The central aperture radial tracking, wherein diffraction grating is divided into three light beams with radiation beam, and outside auxiliary spot is set to leave 1/4th track spaces of center main spot, and its signal difference is used to generate tracking error signal; And three-spots push-pull formula radial tracking, wherein diffraction grating is divided into three light beams with radiation beam, and with the difference of the push-pull signal of main spot and auxiliary spot as tracking error signal.Three-spots push-pull formula radial tracking is better than one-spot push-pull formula system part and is bucking-out system sum of errors asymmetric error automatically.This three-spots push-pull formula radial tracking system has the advantage of the central aperture radial tracking in recording unit, promptly can reach obviously higher signal to noise ratio (S/N ratio), particularly when the scanning blank CD.
Two recording layers of dual layer discs can be write by parallel orbital path (PTP) or opposite orbital path (OTP).In PTP dish, these two layers are write to the outside from the inside of dish, and in OTP, internally to the outside externally layer write, and then turn back to from the outside and inner internal layer to be write.This allows driver almost to read this two layers continuously, and only exists and be used to short interruption that pickup lens is focused on again.This is useful especially for the DVD film, the very long reproduction time that this film need not interrupt.
Fig. 4 shows the synoptic diagram of three adjacent orbits of the first recording layer L0 of OTP dish at right part, the left part of Fig. 4 shows the synoptic diagram of three adjacent orbits of the second recording layer L1 of OTP dish simultaneously.In both cases, radiation beam carries out burning with the track of its 104 pairs of centres of main spot, writes in other words.Two less luminous point 102a, 102b represent auxiliary spot.Three tracks of Fig. 4 left part demonstrate the situation when the second recording layer L1 is write or writes down, and three tracks of Fig. 4 right part demonstrate the situation when the first recording layer L0 write or write down.Write operation is carried out along the direction that makes progress of Fig. 4, luminous point or pit that 200 representatives of therefore oval-shaped black area write.Like this, write area 44 is represented in the bottom of Fig. 4, and Fig. 4 goes up district's representative with respect to the boot section 42 of writing Inbound.Non-track or the empty track of writing of outmost perpendicular line 40 representatives in Fig. 4 left side.The right side of Fig. 4 shows similar empty track.
Therefore, fashionable when the first recording layer L0 is write, the auxiliary spot 102a of guiding finds two empty track, and the auxiliary spot 102b of back finds two and writes track.In contrast, fashionable when the second recording layer L1 is write, the guiding auxiliary spot of Fig. 4 left part only finds now that in a side writes track and in an empty track of opposite side.Same situation is applicable to the auxiliary spot of the back of Fig. 4 left part.But this difference causes slight radial error offset.
In the regular dual layer discs structure of Fig. 2, the very little and relative fixed of this radial error offset.But, in special dual layer discs, in top inverted stack system or P2 substrate disc, have been found that this radial error offset is variable, and therefore may influence the reliability of following the tracks of operation.Thereby may not accurately write in orbit.
Summary of the invention
Therefore, the object of the present invention is to provide a kind of writing station and method, keep in the process that can on having the OTP dish of variable radial error offset, write by means of these apparatus and method reasonably following the tracks of.
This purpose is by realizing as writing station claimed in the claim 1 and as wiring method claimed in the claim 9.
Therefore, at least one of this radial error offset and the Writing power that adds and writing in data asymmetric of being obtained interrelates, and therefore can change this radial error offset before writing or in the ablation process, thereby has reasonably tracking of maintenance under the situation about writing on the record carrier of variable radial error offset.Because the improvement of write performance can improve system margin.
Change if Writing power or data are asymmetric in the write operation process, just can in the write operation process, change this radial error offset, the skew control of adaptation is provided thus.And, can in the best power control program, determine asymmetric (or β), thereby for proposed solution, not need the manufacturing procedure or the device that add.
Particularly, if the Writing power of determining and determine asymmetric at least one change (increase or reduce), just can change this radial error offset (increase or reduce).As a specific examples, can the Writing power of determining and determine asymmetric at least one preset range in change this radial error offset step by step, wherein at every turn with the Writing power determined and determine asymmetric at least one change the corresponding second predetermined quantity, this radial error offset can be changed the first predetermined quantity.Therefore, can make this skew control program keep simple and this skew control program without any need for look-up table or be used to store that specific non-linear concerns or other storeies of controlling value.
If the Writing power of determining and determine asymmetric at least one surpass corresponding predetermined first threshold, just can revise this skew and control to keep this radial error offset constant.In addition, if the Writing power of determining and determine asymmetric at least one less than the corresponding second predetermined threshold value, just can revise this skew and control to keep this radial error offset constant.This provides the advantage that radial error offset control is limited to preset range, wherein can not guarantee rational tracking when skew is not controlled.
If carry out the control that writes to writing station by means of computer equipment, and this writes control based on software program or software routines, the said write device for example coils register or player, proposed skew control or offset correction just can be implemented as computer program, this computer program comprises code device, each step of production method claim 9 when this code device is used for moving on computer equipment.This computer program can be stored on the computer-readable media, as CD or disk.
Define further favourable modification in the dependent claims.
Description of drawings
Based on preferred embodiment the present invention is described now with reference to accompanying drawing, in the accompanying drawings:
Fig. 1 illustrates the schematic block diagram according to the writing station of preferred embodiment,
Fig. 2 illustrates the layer structure of regular write down dual layer discs;
Fig. 3 illustrates the layer structure according to the write down dual layer discs of inverted stack system;
Fig. 4 is illustrated in the synoptic diagram that three-spots push-pull formula in two recording layers of OTP type dish is followed the tracks of operation;
Fig. 5 illustrates the synoptic diagram that three-spots push-pull formula that luminous point may increase is followed the tracks of operation; And
Fig. 6 illustrates and shows that data are asymmetric to the performance plot of error deviation radially.
Embodiment
Now based on describing preferred embodiment as the CD drive among Fig. 1.
Fig. 1 shows those elements that write CD drive included in the control operation in CD drive, wherein can implement the skew controlling schemes according to the preferred embodiment.This CD drive comprises optical pick-up unit 2, by the feed motor (not shown) this optical pick-up unit 2 is moved along the radial direction of CD 1, and the radiation beam with its main beam and two auxiliary beams that is produced focuses on this CD 1.
Here be noted that and in the preferred embodiment, can use any suitable mechanism of focus that is used for adjusting the shaven head of pickup unit 2 according to focal point control device signal.Be also noted that, can utilize any suitable focus error signal to be controlled at focus on this CD.
In addition, this CD drive comprises the actuator (not shown), and this actuator places pickup unit 2 and is used to support the optical lens of pickup unit 2.This actuator is driven by actuator drive 4.This actuator drive 4 comprises focal point control device and tracking control unit, and it drives this actuator by feeding back a signal, and this signal is used to make the object lens of pickup unit 2 to move and move along tracking direction for servocontrol along optical axis direction.In reading unit 6, the signal that receives from pickup unit 2 is handled.
According to the preferred embodiment, offset control unit 7 is provided, this offset control unit generates control signal, and this control signal is used for being controlled at the radial error offset that the write operation process is applied by actuator drive 4.According to making the skew control mode relevant be offset control with power.This can by with this radial error offset and Writing power and write data β or asymmetric at least one interrelate and realize.This Writing power and asymmetric value can obtain from the OPC program, and it can or independent write control module or function is controlled by offset control unit 7.
In order to realize above-mentioned control, offset control unit 7 is according to for example calculating this asymmetry value in a conventional manner through the maximum level that reads signal, minimum level and the DC level of A/D conversion and read the amplitude of signal from what reading unit 6 obtained.In addition, offset control unit 7 can provide conventional skew control function to be used for focal point control, wherein by according to predetermined step-length focal shift being gradually become end value from initial value to actuator drive 4 input control signals.In addition, the laser power that writes that provides in offset control unit 7 calculating and the pickup unit 2 is set to predetermined value, writes down or write the pretest data then, little by little changes this focal shift simultaneously.Afterwards, offset control unit 7 calculates focal shift according to the focus error signal that receives from reading unit 6, and based on definite focal shift is carried out OPC from reading these pretest data.Therefore, Writing power and asymmetric value all are available at offset control unit 7 places, thereby are provided at getting in touch between at least one these value and this radial error offset.
Particularly, the mode that increases according to the increase that makes this radial error offset with Writing power is carried out proposed radial error offset control or is proofreaied and correct.Similarly be that this radial error offset can increase with the increase of the asymmetric quantity of data that calculates.This control of two types can be concurrently, optionally or be individually formed.Certainly, the control of this radial error offset only can limit a kind of in above-mentioned two types equally, for example or interrelate with Writing power or interrelate with data are asymmetric.
In the process for selective of above-mentioned control types, asymmetric (or β) can be used for radial error offset control, and can be by the OPC program from the correction of right title and get, if particularly detect the variation of asymmetry value rather than detect under the situation of variation of performance number.
In the skew control that interrelates with power, (for example can stipulate the predetermined electric power scope, relative value or absolute value 50 to 100), in this scope, (for example increase by 0.1 absolute value or relative value to this radial error offset) for example step by step and carry out radial error offset control by performance number for per 10 units.When being higher than first threshold (for example 100) and be lower than second threshold value (for example 50), this radial error offset no longer changes in ablation process at least, therefore keeps or remains unchanged.Certainly, under situation additional or the selectable and asymmetric skew control that interrelates, can use this identical progressively method with restrictive first and second threshold values.
In these two kinds skew control types, the skew control in opereating specification may be based on linearity or the nonlinear relationship between radial error offset and asymmetry value and/or the performance number.
Fig. 5 shows the synoptic diagram that three-spots push-pull formula that luminous point may increase is followed the tracks of operation.As learned from Figure 5, writing luminous point or pit 200 can increase along dish 1 radial direction, increase to maximum point up to this radial error offset, " seeing " luminous point that wherein guides the left side of auxiliary spot 102a also to begin.This causes will be by the saturation effect of the illeffects of control of proposed radial error offset or the variable offset that correction function stoped.Above-mentioned saturation effect also is the reason that the limited operation scope is adopted in proposed radial error offset control.
Fig. 6 shows the performance plot that shows two sample curves, and it has stipulated the relation between data asymmetric (β) and the radial error offset (REO).As shown in Figure 6, this radial error offset and β value or asymmetry value interrelate with linear relationship, and it is limited to predetermined β scope, surmount this radial error offset of this scope and also no longer increase.Continuous lines has stipulated to have in the null value of zero β value place radial error offset or the relation of predetermined start value, and dotted line has been stipulated the relation when null value that has applied radial error offset or predetermined start value when the β value has reached predetermined value.The sinusoidal curve of Fig. 6 bottom shows the push-pull type control signal that is used for radial tracking.
In a word, described and utilized radiation beam the method and apparatus on the data write recording carrier, in the data of wherein having determined Writing power and on this record carrier, having write asymmetric at least one, and in response to the Writing power of determining and determine asymmetric at least one control the radial error offset that puts on this radiation beam with respect to the writing track of this record carrier 1.Therefore, this radial error offset can with Writing power that applies and acquisition write in data asymmetric at least one interrelate, and therefore can change this radial error offset before writing or in the ablation process, thereby has reasonably tracking of maintenance under the situation about writing on the record carrier of variable radial error offset.
Be noted that description of the invention should not be regarded as limitation of the present invention.Basically, inventive principle of the present invention can be applied to observe any CD or other record carriers of the variable radial error offset relevant with power.Particularly, the present invention can be applicable to any dish writing system, and is intended to cover the control that makes this radial error offset and Writing power and data at least one any kind of that interrelates in asymmetric.Therefore, these preferred embodiments can change in the scope of the claim of enclosing.
At last but very important, note, when term " comprises " when being used in the instructions that comprises claims, it is intended to indicate feature, device, step or the parts that have defined, but does not get rid of existence or increase one or more other features, device, step, parts or its combination.In addition, the speech " " before the element is not in the claims got rid of and is had a plurality of this elements.In addition, any Reference numeral does not limit the scope of this claim.
Claims (10)
1. one kind by utilizing radiation beam that data are write on writing station on the record carrier (1), and described device comprises:
Determine device (7), it is used for determining Writing power and asymmetric at least one of the data that write on described record carrier (1);
Actuator devices (4), it is used for applying predetermined radial error offset with respect to the writing track of described record carrier (1) to described radiation beam; And
Skew control device (7), it is used to control described actuator devices (4), thereby changes described radial error offset in response to described definite Writing power and described definite at least one in asymmetric.
2. device according to claim 1 wherein is configured to described skew control device (7) change described radial error offset in the write operation process.
3. device according to claim 1 and 2 wherein changes described skew control device (7) just to change described radial error offset if is configured to described definite Writing power and described definite at least one in asymmetric.
4. device according to claim 3, wherein described skew control device (7) is configured in the preset range of described definite Writing power and described definite at least one in asymmetric, change described radial error offset step by step, and wherein described definite Writing power and described definite at least one in asymmetric are changed the corresponding second predetermined quantity, described radial error offset is changed the first predetermined amount for each.
5. according to claim 3 or 4 described devices, wherein described skew control device (7) is surpassed corresponding predetermined first threshold and just keeps described radial error offset constant if be configured to described definite Writing power and described definite at least one in asymmetric.
6. according to each described device in the claim 3 to 5, wherein described skew control device (7) is lower than the corresponding second predetermined threshold value and just keeps described radial error offset constant if be configured to described definite Writing power and described definite at least one in asymmetric.
7. according to the described device of each claim of front, wherein described definite device (7) is configured in the best power control program, determine described asymmetric.
8. according to the described device of each claim of front, wherein said record carrier (7) is opposite orbital path (OTP) dish.
9. one kind by utilizing radiation beam that data are write on method on the record carrier (1), and described method comprises the steps:
In the data of determining Writing power and on described record carrier (1), writing asymmetric at least one; And
Control with respect to the writing track of described record carrier (1) and the radial error offset that applies to described radiation beam in response to described definite Writing power and described definite at least one in asymmetric.
10. computer program, it comprises code device, each step of production method claim 9 when described code device moves on computer equipment.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP05105903 | 2005-06-30 | ||
| EP05105903.8 | 2005-06-30 | ||
| EP05107090.2 | 2005-08-01 |
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| CN101213599A true CN101213599A (en) | 2008-07-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2006800237006A Pending CN101213599A (en) | 2005-06-30 | 2006-06-26 | Track writing with radial error offset correction |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101192427B (en) * | 2006-11-28 | 2010-11-03 | Lg电子株式会社 | Apparatus and method for controlling tracking error balance in optical disc apparatus |
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2006
- 2006-06-26 CN CNA2006800237006A patent/CN101213599A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101192427B (en) * | 2006-11-28 | 2010-11-03 | Lg电子株式会社 | Apparatus and method for controlling tracking error balance in optical disc apparatus |
| US8159910B2 (en) | 2006-11-28 | 2012-04-17 | Lg Electronics Inc. | Apparatus and method for controlling tracking error balance in optical disc apparatus |
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Open date: 20080702 |