CN100530375C

CN100530375C - Method of accessing optical disc and information reproducing apparatus thereof

Info

Publication number: CN100530375C
Application number: CNB2007101616557A
Authority: CN
Inventors: 黄钲棋; 黄兆铭
Original assignee: MediaTek Inc
Current assignee: MediaTek Inc
Priority date: 2006-09-28
Filing date: 2007-09-27
Publication date: 2009-08-19
Anticipated expiration: 2027-09-27
Also published as: CN101154398A

Abstract

A method of accessing an optical disc is disclosed. The method includes: enabling a focus servo control without enabling a tracking servo control, and then moving an optical pick-up unit in a radial direction of the optical disc; obtaining at least a first reference signal and a second reference signal according to a laser beam reflected from the optical disc when the optical pick-up unit is moving in the radial direction; and monitoring at least the first reference signal and the second reference signal to identify a boundary of a predetermined data area on the optical disc.

Description

The method of access CD and information regenerator

Technical field

The invention relates to the mechanism of the information of a kind of access record in CD, be meant a kind of before circulation orbital servo starts especially, or before optical disc types is come out by identification, distinguish access system to introduce the method and the relevant information regenerating unit thereof of information to system's introducing of CD by the mobile optical reading unit.

Background technology

Even to this day, CD has become a kind of general storing media, therefore also design a kind of be used for reading be loaded optical disc data or write data into the information regenerator that is loaded CD.Usually when the access CD, need to use one to be used for controlling following rail and focusing on the servo-drive system of moving of optical pick-up unit.In general, circulation orbital servo controlled variable and focus servo parameter must be set validly to obtain best data of optical disk access capability.Yet if before starting circulation orbital servo control and focus servo control, these parameters may cause optical disk system or fetch channel therefore to become unstable as yet not by initialization correctly.With the HD-DVD CD is example, in the HD-DVD CD, there is a large amount of information system that is recorded in to introduce in the district, for example: CD specification kind (book type) (type of CD just), imprinting mark polarity (mark polarity) (indicating CD (high-to-low disc) or CD (low-to-high disc) from high to low from low to high), burst cutting area sign (Burst Cutting Area (BCA) flag), trade shape (track shape) and disc sign indicating number (disc code) (just CD is made sign indicating number) or the like.Under the misjudged situation of imprinting mark polarity of CD, therefore just can't guarantee the stability of servo-drive system and fetch channel, need design the system that can read and introduce the brand-new mechanism of district's information so that follow the rail controlled variable and/or the focus servo parameter can be reached the purpose that promotes the data access ability by initialization validly.

Summary of the invention

Therefore one of purpose of the present invention provides before circulation orbital servo starts or before optical disc types picks out, and introduces the district by the mobile optical reading unit to system and comes access system to introduce the method for information and the border that relevant apparatus is judged the preset data district exactly thereof.

According to an embodiment of the invention, it provides a kind of method of access CD, and said method is included under the situation that does not start circulation orbital servo control and starts focus servo control, then the radial direction of optical pick-up unit along described CD is moved; When described optical pick-up unit when described radial direction moves, respectively described optical pick-up unit is moved to described a plurality of ad-hoc locations in the radial direction of described CD, obtain at least one first reference signal and at least one second reference signal according to laser beam by described CD reflection; Obtain corresponding with described described a plurality of ad-hoc locations in the radial direction of described CD respectively a plurality of first indicated values with reference to described first reference signal; Described a plurality of first indicated values and first preset critical compared produce a plurality of first comparative results; Described second reference signal of reference obtains one of them the second corresponding indicated value with described a plurality of ad-hoc locations; Described second indicated value and second preset critical compared produce second comparative result; And the described border that picks out described preset data district according to described a plurality of first comparative results and described second comparative result.

According to another implementation of the invention, it provides a kind of method of access CD, said method is included under the situation that does not start circulation orbital servo control and starts focus servo control, then move described optical pick-up unit with first direction and make the position of described optical pick-up unit between the center of the border in preset data district and described CD according to the preset displacement amount, then move described optical pick-up unit according to second direction, the radial direction of wherein said CD comprises by the described first direction of inner race track towards outer race track, and the described second direction opposite with described first direction; When described optical pick-up unit moves with described radial direction, respectively described optical pick-up unit is moved to described a plurality of ad-hoc locations in the radial direction of described CD, according to the indicated value that obtains corresponding above-mentioned ad-hoc location by described CD institute laser light reflected bundle; And described indicated value and preset critical relatively produced comparative result, and come the described border in the described preset data of identification district according to described comparative result.

According to another implementation of the invention, it provides a kind of method of access CD.Method includes: start focus servo control under the state that does not start circulation orbital servo control, then the radial direction of optical pick-up unit with CD moved; When the CD reading unit moves with radial direction, obtain swinging signal according to laser beam by CD reflection; And the monitoring swinging signal picks out the border in preset data district on the CD.

According to another implementation of the invention, it provides a kind of method of access CD.Said method includes: provide detecting device at predeterminated position; The radial direction of optical pick-up unit with CD moved; Utilize detecting device to come the detection optical reading unit whether to arrive predeterminated position; And detect optical pick-up unit when having arrived predeterminated position when detecting device, control optical pick-up unit with reference to predeterminated position and come access to be stored in the information in the preset data district on the CD.

According to another embodiment of the present invention, it provides a kind of method of access CD.This method includes: rotary CD; Start the control of focus servo control and circulation orbital servo; And when the disk types of CD is not come out by identification as yet, optical pick-up unit is moved to default introducing district on the CD come access to be stored in wherein introducing information.

Another object of the present invention is to provide a kind of information regenerator, this information regenerator includes: optical pick-up unit is used for the access CD; Travel mechanism, it is couple to described optical pick-up unit; Servo-drive system, it is couple to described optical pick-up unit, and described servo-drive system has focus servo control and circulation orbital servo control; Control system, it is couple to described servo-drive system and described travel mechanism, described control system is controlled described servo-drive system and is used for starting described focus servo control under the situation that does not start the control of described circulation orbital servo, then controls described travel mechanism described optical pick-up unit is moved the described a plurality of ad-hoc locations in the radial direction that respectively described optical pick-up unit moved to described CD along the radial direction of described CD; Signal processing unit, it is couple to described optical pick-up unit, and described signal processing unit obtains at least one first reference signal and at least one second reference signal according to the laser beam by described CD reflection at described optical pick-up unit when described radial direction moves; And border identification logical circuit, it is couple to described signal processing unit, described border identification logical circuit obtains corresponding with described described a plurality of ad-hoc locations in the radial direction of described CD respectively a plurality of first indicated values with reference to described first reference signal, described a plurality of first indicated values and first preset critical compared produce a plurality of first comparative results, described second reference signal of reference obtains one of them the second corresponding indicated value with described a plurality of ad-hoc locations, described second indicated value and second preset critical compared produce second comparative result, then pick out the described border in described preset data district according to described a plurality of first comparative results and described second comparative result.

Another purpose of the present invention is to provide a kind of information regenerator, and this information regenerator includes: optical pick-up unit is used for the access CD; Travel mechanism, it is couple to described optical pick-up unit; Servo-drive system, it is couple to described optical pick-up unit, and described servo-drive system has focus servo control and circulation orbital servo control; Control system, it is couple to described servo-drive system and described travel mechanism, described control system is to be used for controlling described servo-drive system to start described focus servo control under the situation that does not start described circulation orbital servo control, then and control described travel mechanism and move described optical pick-up unit according to the preset displacement amount with first direction and make the position of described optical pick-up unit between the center of the border in preset data district and described CD, then and according to second direction move described optical pick-up unit, the radial direction of wherein said CD includes by inner race track towards the described first direction of outer race track and the described second direction opposite with described first direction; Signal processing unit, it is couple to described optical pick-up unit, described signal processing unit be described optical pick-up unit when described radial direction moves according to the corresponding indicated value that obtains by described CD institute laser light reflected bundle with ad-hoc location; And border identification logical circuit, it is couple to described signal processing unit, and described border identification logical circuit relatively produces comparative result to described indicated value and preset critical, and according to the described border in the described preset data of described comparative result identification district; And when identification was come out not according to described comparative result on the described border in described preset data district, described control system was controlled described travel mechanism described optical pick-up unit is moved to next ad-hoc location.

The present invention can judge the border in preset data district more accurately than prior art, thereby reading system is introduced the data in the district, has guaranteed that CD can correctly be operated.

Description of drawings

Fig. 1 is the synoptic diagram of an exemplary embodiment of information regenerator of the present invention.

Fig. 2 is the process flow diagram of first embodiment of information regenerator shown in Figure 1.

Fig. 3 is the process flow diagram of first example of step 207 shown in Fig. 2 and step 208.

Differential phase-detection error was followed rail signal S when Fig. 4 was presented at the write formula HD-DVD CD that reads read-only HD-DVD CD, blank write formula HD-DVD CD and a non-blank-white ₁, S ₂And S ₃Oscillogram.

Fig. 5 is parameter M1, the M2 of preset displacement amount of definition optical pick-up unit and the synoptic diagram of M3.

Fig. 6 is a plurality of position candidate P of optical pick-up unit ₁～P ₂₅Synoptic diagram.

Fig. 7 is the process flow diagram of second example of step 207 and step 208 among Fig. 2.

Fig. 8 is the parameter M2 of preset displacement amount of definition optical pick-up unit and the synoptic diagram of M4.

Fig. 9 is the process flow diagram of second embodiment of information regenerator shown in Figure 1.

Figure 10 is the synoptic diagram of parameter M5 of the preset displacement amount of definition optical pick-up unit.

Figure 11 is the process flow diagram of the 3rd embodiment of information regenerator shown in Figure 1.

Embodiment

In the middle of patent specification and claims, used some vocabulary to call specific assembly.Those skilled in the art should understand, and hardware manufacturer may be called same assembly with different nouns.This specification and claims book is not used as distinguishing the mode of assembly with the difference of title, but the criterion that is used as distinguishing with the difference of assembly on function.Be open term mentioned " comprising " in the middle of instructions and the claim item in the whole text, so should be construed to " comprise but be not limited to ".In addition, " couple " speech and comprise any indirect means that are electrically connected that directly reach at this.Therefore, be coupled to second device, then represent above-mentioned first device can directly be electrically connected in above-mentioned second device, or be connected electrically to above-mentioned second device indirectly by other device or connection means if describe first device in the literary composition.

Fig. 1 is the synoptic diagram of the information regenerator 100 of embodiment of the present invention.In the present embodiment, information regenerator 100 includes: and Spindle Motor 101, optical pick-up unit (Optical Pick-up Unit, OPU) 102, signal processing unit 104, servo-drive system 106, travel mechanism 108, control system 110, limit switch (limit switch) 112 and border identification logical circuit 114.Spindle Motor 101 is used to come rotary CD 10 (for example: the HD-DVD CD) with a desirable rotating speed when it starts.Optical pick-up unit 102 includes laser diode (not being presented among Fig. 1), and this laser diode is used for giving off laser beam above the CD 10, and photodiode (not being presented among Fig. 1), and this photodiode is used for the laser beam that sensing reflects.The output signal that signal processing unit 104 is used to handle optical pick-up unit 104 produces composite signal and gives servo-drive system 106, and for instance, signal processing unit 104 output tracking error signals and focus error signal are to servo-drive system 106.As shown in Figure 1, signal processing unit 104 also is couple to border identification logical circuit 114 to provide border identification logical circuit 114 required signal, for example: differential phae detects tracking error (Differential Phase DetectionTracking Error, DPDTE) signal, radio frequency (Radio Frequency, RF) signal and swing (wobble) signal.

Then, servo-drive system 106 moves along with measured focusing error laser spots (laser spot) by a plurality of drivers (actuator) that are positioned at optical pick-up unit 102 that control is not presented among Fig. 1 along vertical direction, or this laser spots is moved along horizontal direction along with measured tracking error.Travel mechanism 108 includes and is used for the circuit unit of mobile optical reading unit 102, for example: optically read unit 102 is placed on the sled (sled), is used for optical pick-up unit 102 is moved to the ad-hoc location in the radial direction of CD 10 and travel mechanism 108 includes a step motor and other interlock circuit assembly.Control system 110 is used to control the running of whole information regenerator 100, for example: start or close circulation orbital servo control and focus servo control and the startup in the servo-drive system 106 or close Spindle Motor 101.As shown in Figure 1, information regenerator 100 has a limit switch 112 that is used for stopping optical pick-up unit 102, so that optical pick-up unit 102 is parked in one by limit switch 112 determined predeterminated positions.Information regenerator 100 also disposes the border identification logical circuit 114 that is used for identifying predeterminable area border on the CD 10.For the purpose of simple declaration, in ensuing narration, CD 10 is HD-DVD CDs, and the predeterminable area that is positioned on the CD 10 is that the system that meets the HD-DVD specification introduces district (system lead-in area), but note that, this is not to be restrictive condition of the present invention, in addition, represent just usefulness of these assemblies with individual other function square in order to illustrate, assembly just shown in Figure 1 does not limit and will be separately positioned among the information regenerator 110, has other hardware configuration mode that meets spirit of the present invention yet.

Please be simultaneously with reference to Fig. 1 and Fig. 2, shown in Figure 2 is the process flow diagram of the first operation embodiment of information regenerator 100 shown in Figure 1.Note that if can reach identical result in fact, the sequence of steps that might not need to abide by in the flow process shown in Figure 2 is carried out in regular turn.This flow process includes following steps:

Step 202: with CD 10 load information regenerating units 100.

Step 204: control system 110 is opened Spindle Motor 101 and is begun rotating disc 10.

Step 206: control system 110 Control Servo System 106 start focus servo control with the imprinting layer of Focus hold on CD 10 (for example HD-DVD CD) by the laser beam of optical pick-up unit 102 output.

Step 207: border identification logical one 14 picks out the border in system's introducing district on the CD 10.

Step 208: control system 110 control travel mechanisms 108 introduce the system that optical pick-up unit 102 moves on to CD 10 in the district.

Step 210: control system 110 Control Servo System 106 start circulation orbital servo control come on the CD 10 imprinting layers track and will be in orbit by the laser spots that laser beam the constituted locking of optical pick-up unit 102 outputs.

Step 212: optical pick-up unit 102 reading systems are introduced information, for example: CD specification kind (optical disc types), imprinting mark polarity (indicating CD or CD from high to low from low to high), burst cutting area sign, trade shape, disc sign indicating number (just CD is made sign indicating number) or the like.

Step 214: control system 110 control travel mechanisms 108 introduce the district with the system that optical pick-up unit 102 shifts out CD 10.

Step 216: control system 110 is introduced the system's introducing information that reads the district according to the system from CD 10 and is set servo parameter.

Step 218: control system 110 suitably is provided with focus servo control and circulation orbital servo control according to the servo parameter that step 216 sets with Control Servo System 106.Then, the operation according to information regenerator 100 starts focus servo control, circulation orbital servo control or starts two kinds of servocontrol simultaneously.For instance, when optical pick-up unit 102 reads the data that are stored in CD 10 middle orbits, this moment, the control of focus servo control and circulation orbital servo all was in starting state.In other words, be exactly that control system is carried out normal servo startup action and signal correction flow process again after reading the introducing data.

Narrate as the front, before optical pick-up unit 102 system that is moved to introduces the district, circulation orbital servo control keeps closing state always, and in other words, control system 110 Control Servo System 106 under the state that does not start circulation orbital servo control at the beginning starts focus control.Then control system 110 order travel mechanisms 108 introduce optical pick-up unit 102 system that is moved in the district.Next will describe two examples and clearly explain how optical pick-up unit 102 to be moved to the operation in the preformed system introducing district on the CD 10.Note that these two embodiments only are used for the usefulness of explanation, are not construed as limiting the invention.

Please refer to Fig. 3, Fig. 3 is the process flow diagram of first example of step 207 shown in Figure 2 and step 208.Note that if can reach identical result in fact, the sequence of steps that might not need to abide by flow process shown in Figure 3 is carried out in regular turn.This flow process includes following steps:

Step 300: beginning.

Step 302: control system 110 control travel mechanisms 108 are with optical pick-up unit 102 a past interior mobile M1 step-length (step).

Step 304: control system 110 control travel mechanisms 108 come mobile optical reading unit 102 according to monitoring window (monitor window).Then, when optical pick-up unit 102 was positioned at by defined three the different optical pick-up unit positions of present monitoring window, border identification logical circuit 114 can measure its differential phae and detect the crest of tracking error signal to peak voltage value DPDTEV _PPO, DPDTEV _PPC and DPDTEV _PPI.

Step 305: identification logical circuit 114 in border detects three crests of tracking error signal to peak voltage value DPDTEV with differential phae _PPO, DPDTEV _PPC and DPDTEV _PPThe I and the first preset critical DPDTE_LV compare to produce a plurality of first comparative results.

Does step 306: first comparative result meet " HLL "? if then execution in step 328; Otherwise, execution in step 310.

Does step 310: first comparative result meet " LLL "? if then execution in step 314; Otherwise, execution in step 312.

Step 312: control system 110 control travel mechanisms 108 move inward optical pick-up unit the optical pick-up unit position (just, upgrading present monitoring window) that is positioned at monitoring window with renewal.Then, when optical pick-up unit 102 is positioned at three during by the defined different optical reading unit of present monitoring window position, obtain differential phae and detect three crests of tracking error signal peak voltage value: DPDTEV _PPO, DPDTEV _PPC and DPDTEV _PPI.Get back to step 305.

Step 314: border identification logical circuit 114 measures the crest of swinging signal to peak voltage value WOBV _PP

Step 315: border identification logical circuit 114 with the crest of swinging signal to peak voltage value WOBV _PPCompare to produce second comparative result with the second preset critical WOB_LV.Confirm then whether this second comparative result points out that the crest of this swinging signal is to peak voltage value WOBV _PPBigger than the second preset critical WOB_LV.If then execution in step 320; Otherwise then execution in step 318.

Step 318: control system 110 control travel mechanisms 108 outwards move optical pick-up unit 102 and upgrade the optical pick-up unit position (just, upgrading present monitoring window) that is positioned at monitoring window.Then during three of the monitoring window of identification logical circuit 114 in border after optical pick-up unit 102 is positioned at renewal different optically read positions, obtain differential phae and detect the crest of tracking error signal peak voltage value DPDTEV _PPO, DPDTEV _PPC and DPDTEV _PPI.Get back to step 305.

Step 320: border identification logical circuit 114 measures the crest of radiofrequency signal to peak voltage value RFV _PP

Step 322: border identification logical circuit 114 with the crest of radiofrequency signal to peak voltage value RFV _PPCompare to produce the 3rd comparative result with the 3rd preset critical RF_LV.Confirm then whether this 3rd comparative result points out that the crest of this radiofrequency signal is to peak voltage value RFV _PPBigger than the 3rd preset critical RF_LV.If then execution in step 318; Otherwise then execution in step 326.

Step 326: control system 110 control travel mechanisms 108 move inward M3 step-length with optical pick-up unit 102.Get back to step 304.

Step 328: border identification logical circuit 114 measures the crest of swinging signal to peak voltage value WOBV _PP

Step 330: border identification logical circuit 114 with the crest of swinging signal to peak voltage value WOBV _PPCompare with the second preset critical WOB_LV and to produce second comparative result, confirm then whether this second comparative result points out that the crest of swinging signal is to peak voltage value WOBV _PPBigger than the second preset critical WOB_LV.If then execution in step 326; Otherwise then execution in step 334.

Step 334: control system 110 control travel mechanisms 108 are with optical pick-up unit 102 an outside mobile M2 step-length.

Step 336: finish.

In above-mentioned flow process example, these three reference signals (being that differential phae detects tracking error signal, swinging signal and radiofrequency signal) are used the boundary position place in system's introducing district on the CD 10 of finding out loading.Specification according to HD-DVD; the HD-DVD CD generally includes the data field, the system in this data field introduces the district and is positioned at the undefined district that system introduces the district; in addition; other has the burst cutting area of the selectivity (optional) that is formed on the HD-DVD CD, can be placed on usually in this undefined district.And system of the present invention introduce the Boundary Recognition operation in district mainly be based on differential phae detect tracking error signal, swinging signal and these three signals of radiofrequency signal in undefined district, system's unlike signal feature of introducing district, data field and burst cutting area decides boundary position.Please refer to Fig. 4, Fig. 4 has shown that differential phase-detection error is followed rail signal S when the write formula HD-DVD CD of write a formula HD-DVD CD that reads read-only HD-DVD CD, blank and a non-blank-white ₁, S ₂And S ₃Oscillogram.As shown in Fig. 4, differential phae detects error and follows rail signal S ₁When reading this read-only HD-DVD optical disc data district or system introducing district, have significant amplitude and produce, follow rail signal S yet differential phae detects error ₁The amplitude that the time is produced in the undefined district that reads this read-only HD-DVD CD is small and can be uncared-for; Detect error as for differential phae and follow rail signal S ₂, it has significant amplitude when only introducing the district in the system that reads blank write formula HD-DVD CD and produces, and the amplitude that is produced when reading blank write formula HD-DVD optical disc data district or definition all is small and can be uncared-for.If this sheet can write formula HD-DVD CD and non-blank-white, also just expression has had data to be recorded in the optical disc data district, and when the data of reading and recording in the data field, differential phae detects error and follows rail signal S ₃Having significant amplitude produces.For instance, comprised the test section (test zone) that is used for writing test data at some correction program (for example best power control) in this data field, therefore when optical pick-up unit 102 is moved to this test section, follow rail signal S by the differential phae detection error that signal processing unit 104 is produced ₃Just have corresponding remarkable amplitude.

Have remarkable amplitude when as shown in Figure 4, introducing the boundary position in district and smallly ignore the two transformation of amplitude and produce in system.In this embodiment, the present invention is disclosed, and to be used for method that identification system introduces the border in district promptly be to be searched by remarkable amplitude when the radial direction of inner race track moves by outer race track according to one at optical pick-up unit 102 to become the small transformation of ignoring amplitude.Yet when optical pick-up unit 102 when reading the write formula HD-DVD CD of non-blank-white, if when being moved to position A or C, there is a signal in the capital from the small transformation generation of ignoring amplitude to remarkable amplitude, therefore, when border identification logical circuit 114 identifies such transformation, possibly can't determine the tram of optical pick-up unit 102 definitely; Similarly, when optical pick-up unit 102 when reading the write formula HD-DVD CD of non-blank-white, if when being moved to position B or D, differential phae detects error and follows rail signal S ₃Equally all have only small insignificant amplitude size, therefore when border identification logical circuit 114 identifies such transition stage, the tram of optical pick-up unit 102 can't be determined out definitely too.Based on above reason, border identification logical circuit 114 needs further reference wobble signal to distinguish the tram at optical pick-up unit 102 places, mainly is because swinging signal all has small insignificant amplitude generation reading when read-only HD-DVD CD maybe can write the undefined district of formula HD-DVD CD.As previously described, the burst cutting area that the HD-DVD CD admits of a selectivity (optional) is formed near the center of CD, when if optical pick-up unit 102 is moved to this burst cutting area, then the differential phae of this moment detects tracking error signal and has small insignificant amplitude, the swinging signal that is produced by signal processing unit 104 then has significant amplitude generation, because so, if this burst cutting area is formed in the HD-DVD CD, just border identification logical circuit 114 can not a reference wobble signal decide optical pick-up unit 102 to move to data field or burst cutting area.In order to address this problem, border identification logical circuit 114 needs further distinguish with reference to radiofrequency signal the tram at optical pick-up unit 102 places, mainly is to produce because have significant amplitude during the burst cutting area of radiofrequency signal on reading the HD-DVD CD.

In addition, in the middle of flow process example shown in Figure 3, three parameter M1, M2 and M3 are set three preset displacement amounts that define optical pick-up unit 102 respectively.As shown in Figure 5, M1 is the parameter that suitably defined of needs so that optical pick-up unit 102 can be introduced in the district by the shift-in system under most situation.For instance, if when border identification (search) when program begins, the reference position of optical pick-up unit 102 drops in the region R 1, and then the next position of optical pick-up unit 102 will be dropped in another region R 2.M2 is a definite value and can calculates according to track gauge and the controlling mechanism that is adopted (for example: step motor is controlled), also because so, when the border in system introducing district has successfully been defined, in optical pick-up unit 102 just can be distinguished by parameter M2 and by the introducing of immigration system correctly.The border identification program at the beginning the time if the system that can't optical pick-up unit 102 be moved to according to parameter M1 introduces in the district, M3 is that the parameter that suitably defined of needs is so that optical pick-up unit 102 system that can be moved under most situation introduces in the district.Note that three parameters of M1, M2 and M3 only are to be used for the usefulness of explanation, do not constitute restrictive condition of the present invention, that is to say, in other embodiments, the displacement that uses multiparameter more to define optical pick-up unit 102 also is feasible.

Please also refer to Fig. 3 and Fig. 6, Figure 6 shows that the synoptic diagram of a plurality of position candidate P1～P25 of optical pick-up unit 102.Note that the gap size of adjacent position only is to be used for the usefulness of explanation, is not construed as limiting the invention condition.For instance, the interval of adjacent position can be equidistant between these position candidate P1～P25, and each corresponds to the distance of N step-length of step motor (being travel mechanism 108) at interval.Below provide some examples clearly to describe the method that disclosed identification system is introduced the border in district here.

Example (1)

Suppose when the border flow process of optical pick-up unit 102 in identification system introducing district begins, properly do not moved in the R1 zone as shown in Figure 5, and optical pick-up unit 102 according on the CD 10 by outer race track towards the radial direction of inner race track be moved M1 step-length distance and in the data field, for example, position P shown in Figure 6 ₃

In step 304, when optical pick-up unit 102 at position P ₃The time, can measure a differential phae and detect the crest of tracking error signal peak voltage value DPDTEV _PPC.In the present invention, for the output (for example: differential phae detects tracking error signal, swinging signal or radiofrequency signal) from signal processing unit 104 obtains needed indicated value (for example: crest is to peak voltage), need to use a monitoring window that the location definition that optical pick-up unit 102 should be moved into is come out, for instance, whether three indicated values that measured respectively are to be used for judging being found system to introduce the border in district by present monitoring window.So optical pick-up unit 102 has been moved inward the distance of N step-length to position P ₄, and record differential phae and detect the crest of tracking error signal to peak voltage value DPDTEV _PPI.Next, optical pick-up unit 102 distance that outwards moved 2*N step-length has arrived position P ₂Therefore, and record differential phae and detect the crest of tracking error signal to peak voltage value DPDTEV _PPO.Obtaining three crests to peak voltage value DPDTEV _PPO, DPDTEV _PPC and DPDTEV _PPAfter the I, optical pick-up unit 102 has more been moved inward the distance of N step-length, that is to say, optical pick-up unit 102 is by from position P ₂Be moved back into reference position P ₃

What note that optical pick-up unit 102 mobilely is not limited to above-mentioned mechanism.For instance, in the another one example, optical pick-up unit 102 has at first outwards been moved the distance of N step-length and has been arrived position P ₂Therefore, and measure differential phae and detect the crest of tracking error signal to peak voltage value DPDTEV _PPO, next, optical pick-up unit 102 has been moved inward the distance of 2*N step-length and has been arrived position P ₄, and record differential phae and detect the crest of tracking error signal to peak voltage value DPDTEV _PPI.Detect the crest of tracking error signal to peak voltage value DPDTEV obtaining differential phae _PPI, DPDTEV _PPC and DPDTEV _PPAfter the O, optical pick-up unit 102 has just outwards been moved the distance of N step-length, that is to say, optical pick-up unit 102 is by from position P ₄Moved on to reference position P ₃More than the same spirit according to the invention of these contents, and drop among the category of the present invention.

In addition, the optical pick-up unit 102 pairing target location, distance back that is moved M1 step-length is not restricted to the center of monitoring window.As position P ₃Be when the situation of the position in the outside of monitoring window, optical pick-up unit 102 in step 302 by toward an interior mobile M1 step-length apart from in-position P ₃Obtain a differential phae and detect the crest of tracking error signal peak voltage value DPDTEV _PPO, next, optical pick-up unit 102 further is moved into position P ₄And position P ₅Detect the crest of tracking error signal to peak voltage value DPDTEV and obtain differential phae successively _PPC and DPDTEV _PPI.Same, under the another one situation, this moment position P ₃When the inner side of monitoring window, optical pick-up unit 102 is back at position P in execution in step 302 ₃Obtain a differential phae and detect the crest of tracking error signal peak voltage value DPDTEV _PPI, then, when optical pick-up unit 102 is further outwards moved to position P ₂And position P ₁Detect the crest of tracking error signal to peak voltage value DPDTEV and in turn obtain differential phae _PPC and DPDTEV _PPO.In brief, the size of monitoring window (being the position number that is comprised in the monitoring window) and be to decide according to design requirement by the configuration of defined these positions of monitoring window, and these design variation all belong to category of the present invention.

In step 305, these three differential phaes detect the crest of tracking error signal to peak voltage value DPDTEV _PPO, DPDTEV _PPC and DPDTEV _PPI can compare with the first preset critical DPDTE_LV, and has therefore produced a plurality of first comparative results.If to the peak voltage value when big than the first preset critical DPDTE_LV, can produce first comparative result is " H " by the crest that recorded; Otherwise, can be produced as first comparative result of " L ".In step 306, corresponding respectively a plurality of first comparative results of outer fix, center and the inner side of detection window at present can be verified whether meet special style " HLL ".For the purpose of simple declaration, in ensuing narration, position P ₃Be defined as the center of monitoring window.Therefore work as a plurality of first comparative results and met special style " HLL ", it represents position P ₃Very near position A shown in Fig. 4 or position C.Please note, though after a mobile M1 step-length, optical pick-up unit 102 is supposed to be arranged in ideally system and is introduced the district, yet border identification logical circuit 114 is after step 302 and do not know the physical location place of optical pick-up unit 102, also because so, if above-mentioned comparative result meets, optical pick-up unit 102 is positioned at position P ₃The time measure the crest of swinging signal again to peak voltage value WOBV _PP(step 328).Then, the crest of this swinging signal is to peak voltage value WOBV _PPCompare with the second preset critical WOB_LV and to produce second comparative result, if the crest of the swinging signal that is recorded is to peak voltage value WOBV _PPWhen bigger, just can guarantee this position P than the second preset critical WOB_LV ₃Be to be positioned near the position A shown in Fig. 4; Otherwise, this position P ₃Just should be to be positioned near the position C shown in Fig. 4.In this example, optical pick-up unit 102 still is positioned at the data field, and after execution in step 330, the crest of swinging signal is to peak voltage value WOBV _PPCan than the second preset critical WOB_LV come big.Next can execution in step 326 102 optical pick-up units be introduced in the district with the system that attempts optical pick-up unit 102 is moved on to CD 10 again toward an interior mobile M3 step-length.

Suppose that optical pick-up unit 102 will be by the position P in the data field after the distance that has moved M3 step-length ₃The system that moves on to introduces the position P in the district ₁₃Please note, since the position at optical pick-up unit 102 present places can be in the data field Anywhere, do not guarantee that the distance that optical pick-up unit 102 is moved M3 step-length from the position that is positioned at the data field at present place is bound to make optical pick-up unit 102 system that moves to introduce the district, also because so, this border identification program can continue to carry out, till successfully picking out the position C shown in Fig. 4.In step 304, monitoring window can be updated in order to comprise position P ₁₂, P ₁₃And P ₁₄, and can obtain three and position P ₁₂, P ₁₃And P ₁₄The crest of corresponding differential phase-detection tracking error signal is to peak voltage value DPDTEV _PPO, DPDTEV _PPC and DPDTEV _PPI.Can know very clearly that here the Rule of judgment of step 306 and step 310 can't be satisfied, because the pattern of a plurality of first comparative results " HHH " is also inequality with " HLL " and " LLL ".In step 312, optical pick-up unit 102 is moved in more past and causes the position in the monitoring window to upgrade thereupon, when optical pick-up unit 102 had been moved to the diverse location at the monitoring window place after upgrading, the crest that can obtain three corresponding differential phase-detection tracking error signals was to peak voltage value DPDTEV _PPO, DPDTEV _PPC and DPDTEV _PPI.

Next some will be described about how upgrading the embodiment of monitoring window.In the middle of the embodiment that monitoring window upgrades, upgrade position in the monitoring window by the distance that optical pick-up unit 102 has been moved inward N step-length.Utilize this method, optical pick-up unit 102 is by from position P ₁₃Moved on to position P ₁₄, thus, the previous crest that measures just can be used again to the peak voltage value, that is to say position P in the corresponding previous monitoring window ₁₃And position P ₁₄Differential phae detect the crest of tracking error signal to peak voltage value DPDTEV _PPC and DPDTEV _PPI has become the position P of corresponding present monitoring window ₁₃And position P ₁₄Differential phae detect the crest of tracking error signal to peak voltage value DPDTEV _PPO and DPDTEV _PPC.Therefore, detect the crest of tracking error signal to peak voltage value DPDTEV in order to obtain differential phae _PPI, optical pick-up unit 102 has been moved inward the distance of N step-length, and just, optical pick-up unit 102 is from position P ₁₄Moved on to position P ₁₅And detect the crest of tracking error signal to peak voltage value DPDTEV at differential phae _PPAfter I successfully measured and obtains, optical pick-up unit 102 had further outwards been moved the distance of N step-length, that is to say, from position P ₁₅Got back to position P ₁₄

In the embodiment that another monitoring window upgrades, by optical pick-up unit 102 is moved inward the distance of 2*N step-length with the position renewal in the monitoring window.Thus, optical pick-up unit 102 is just from position P ₁₃Moved on to position P ₁₅, therefore the previous crest that measures just can be used again to the peak voltage value, that is to say, position P in the corresponding previous monitoring window ₁₄Differential phae detect the crest of tracking error signal to peak voltage value DPDTEV _PPI has become position P in the corresponding present monitoring window ₁₄Differential phae detect the crest of tracking error signal to peak voltage value DPDTEV _PPO.Therefore, be positioned at position P when optical pick-up unit 102 ₁₅In time, can record differential phae and detects the crest of tracking error signal to peak voltage value DPDTEV _PPC.Detect the crest of tracking error signal to peak voltage value DPDTEV in order to obtain needed differential phae _PPI, optical pick-up unit 102 has been moved inward the distance of N step-length, that is to say, by from position P ₁₅Moved on to position P ₁₆, and detect the crest of tracking error signal to peak voltage value DPDTEV at differential phae _PPAfter I was successfully measured, optical pick-up unit 102 had just further outwards moved the distance of N step-length, that is to say, from position P ₁₆Be moved back into position P ₁₅

In the embodiment that the another one monitoring window upgrades, by optical pick-up unit 102 being moved inward longer distance (more multistep long number) with the position renewal in the monitoring window.Thus, the previous crest that measures can not be used again to the peak voltage value.For instance, optical pick-up unit 102 is by from position P ₁₃Moved on to position P ₁₆, so correspondence position P ₁₅, P ₁₆And P ₁₇Differential phae detect the crest of tracking error signal to peak voltage value DPDTEV _PPO, DPDTEV _PPC and DPDTEV _PPI must measure from the differential phae detection of error signals according to the running identical with step 304 and obtain.And further instruction just repeats no more in this omission.

Successfully obtained differential phae by step 312 and detected the crest of tracking error signal peak voltage value DPDTEV _PPO, DPDTEV _PPC and DPDTEV _PPAfter the I, then continue step 306.Can know very clearly that here the Rule of judgment of step 306 and step 310 does not satisfy, because differential phae detects the crest of tracking error signal to peak voltage value DPDTEV _PPO, DPDTEV _PPC and DPDTEV _PPA plurality of first comparative results of I are corresponding " HHH ".Therefore, over and over again repeating step 312 makes that optical pick-up unit 102 is moved toward interior again and again, and the center in monitoring window has arrived position P ₁₇Till.When optical pick-up unit 102 owing to one of them previously mentioned monitoring window refresh routine has been moved to position P ₁₇, the Rule of judgment in the step 306 will obtain correspondence position P respectively successfully ₁₆, P ₁₇And P ₁₈Differential phae detect the crest of tracking error signal to peak voltage value DPDTEV _PPO, DPDTEV _PPC and DPDTEV _PPI is satisfied afterwards, and at this moment, the crest of swinging signal is to peak voltage value WOBV _PPTherefore will be measured and and the second preset critical WOB_LV compares and produce second comparative result.Because position P ₁₇Be positioned at undefined district, second comparative result that obtain this moment will indicate the crest of swinging signal to peak voltage value WOBV _PPNot big than the second preset critical WOB_LV, therefore, border identification logical one 14 can be judged and find system to introduce the border in district, follows and inform control system 110.Then, control system 110 is then controlled the distance that travel mechanism 108 has outwards moved optical pick-up unit 102 M2 step-length.In brief, after the border in system introducing district is found, also just guarantee that optical pick-up unit 102 can be according to correctly being moved on to by the distance of a predefined M2 step-length in the system introducing district, mainly be because generally speaking the border that system introduces the district is a known and fixing position that is positioned on the CD 10.

On the other hand, in step 312, optical pick-up unit 102 has been moved on to position P ₃And judge that among step 305 differential phae detects the crest of tracking error signal to peak voltage value DPDTEV _PPO, DPDTEV _PPC and DPDTEV _PPWhen I was not big than the first preset critical DPDTE_LV, the Rule of judgment of step 306 did not satisfy, yet the Rule of judgment in the step 310 is satisfied.As noted earlier, though at the beginning after having been moved inward the distance of M1 step-length, optical pick-up unit 102 should be in system very ideally to be introduced in the district, yet, for border identification logical circuit 114, after having carried out step 302, border identification logical one 14 still can not known the physical location at optical pick-up unit 102 place after having carried out step 302, also therefore when 102 of optical pick-up units at position P ₃The time can need to measure this moment the crest of swinging signal to peak voltage value WOBV _PP(step 314).And next, the crest of swinging signal is to peak voltage value WOBV _PPMeeting compare with the second preset critical WOB_LV and produce second comparative result with this, if second comparative result has pointed out that the crest of swinging signal is to peak voltage value WOBV _PPNot big than the second preset critical WOB_LV, also just can conclude position P ₃Be positioned at undefined district, for instance, position P ₃Near the position D that can in Fig. 4, be indicated.Otherwise, position P ₃Just may be in the data field or in the burst cutting area on CD 10.In the present embodiment, because optical pick-up unit 102 is still in the data field, in execution in step 315, the crest of swinging signal is to peak voltage value WOBV _PPWill be bigger than the second preset critical WOB_LV, also because so, when optical pick-up unit 102 is positioned at position P ₃The time, need to measure the crest of radiofrequency signal at this moment to peak voltage value RFV _PPChecking at this moment, optical pick-up unit 102 is positioned at data field or burst cutting area (step 320).Then, the crest of radiofrequency signal is to peak voltage value RFV _PPBrought to compare producing the 3rd comparative result, if this 3rd comparative result indicates the crest of radiofrequency signal to peak voltage value RFV with the 3rd preset critical RF_LV _PPNot big than the 3rd preset critical RF_LV, this just can conclude position P ₃Be in the data field, for instance, position P ₃Near the position B that can in Fig. 4, be indicated; Otherwise, position P ₃Can be determined in burst cutting area.In present example since optical pick-up unit 102 still in the data field, the crest of radiofrequency signal is to peak voltage value RFV _PPWill can be not bigger than the 3rd preset critical RF_LV.As shown in Figure 3, after having carried out step 322, optical pick-up unit 102 will be moved inward the distance of M3 step-length.Even if optical pick-up unit 102 has been moved to system and has introduced in the district, identification flow process in border still can continue to carry out, till the Rule of judgment of step 306 satisfies.Since before described the operation of border identification flow process in detail, so further instruction just repeats no more in this omission.

Example (2)

Suppose when the flow process on the border that the identification system introducing is distinguished begins, optical pick-up unit 102 has suitably been moved on in the region R 1 as shown in Figure 5, and optical pick-up unit 102 is according to having moved the distance of M1 step-length and the system that enters introduces in the district by outer race track towards the radial direction of inner race track on the CD 10, for example, position P shown in Figure 6 ₁₃

Since position P in this example ₁₃Be center at monitoring window, then in step 304, measure three differential phaes detect the crest of tracking error signals to peak voltage value DPDTEV _PPO, DPDTEV _PPC and DPDTEV _PPI can distinguish correspondence position P ₁₂, P ₁₃And P ₁₄Be clear that very that here three differential phaes detect the crest of tracking error signal to peak voltage value DPDTEV _PPO, DPDTEV _PPC and DPDTEV _PPI can be bigger than the first preset critical DPDTE_LV.Because do not satisfy the Rule of judgment in step 306 and the step 310, monitoring window is upgraded so optical pick-up unit 102 can move inward.This border identification flow process will continue, till the Rule of judgment in step 306 satisfies.Since described the operation of border identification flow process in detail, so further instruction just repeats no more in this omission before.

Example (3)

Suppose when the flow process on the border that the identification system introducing is distinguished begins, optical pick-up unit 102 has suitably been moved on in the region R 1 as shown in Figure 5, and optical pick-up unit 102 according on the CD 10 by outer race track towards the radial direction of inner race track moved M1 step-length distance and in the undefined district, for example, position P shown in Figure 6 ₁₉

Because position P in this example ₁₉Be center at monitoring window, then in step 304, measure three differential phaes detect the crest of tracking error signals to peak voltage value DPDTEV _PPO, DPDTEV _PPC and DPDTEV _PPI can distinguish correspondence position P ₁₈, P ₁₉And P ₂₀Be clear that very that here three differential phaes detect the crest of tracking error signal to peak voltage value DPDTEV _PPO, DPDTEV _PPC and DPDTEV _PPI is big unlike the first preset critical DPDTE_LV, therefore, does not satisfy the Rule of judgment of step 306, but has met the Rule of judgment in the step 310.As before described, though after the distance that has been moved M1 step-length, optical pick-up unit 102 is assumed to be ideally in system introduces the district, yet identification logical one 14 in border is after step 302, and do not know the physical location place of optical pick-up unit 102, also therefore when optical pick-up unit 102 at position P ₁₉The time, need to measure the crest of swinging signal at this moment to peak voltage value WOBV _PP(step 314).Then, the crest of this swinging signal is to peak voltage value WOBV _PPCompare with the second preset critical WOB_LV and to be used for producing second comparative result.In this example, because optical pick-up unit 102 is in undefined district, when execution in step 315, the crest of the swinging signal that is recorded is to peak voltage value WOBV _PPWill can be not bigger than the second preset critical WOB_LV, so optical pick-up unit 102 can outwards be moved monitoring window is upgraded.Similarly, can optical pick-up unit 102 outwards be moved according to the monitoring window update mechanism of any one above-mentioned exposure.As shown in Fig. 3, step 318 will repeatedly be carried out always, till the Rule of judgment of step 306 satisfies, that is to say that optical pick-up unit has been moved near the position the position C shown in Fig. 4.Since before described the ensuing operation of border identification flow process in detail, so further instruction just repeats no more in this omission.

Example (4)

Suppose when the flow process on the border that the identification system introducing is distinguished begins, optical pick-up unit 102 has not suitably been moved on in the region R 1 as shown in Figure 5, and optical pick-up unit 102 according on the CD 10 by outer race track towards the radial direction of inner race track moved M1 step-length distance and in the burst cutting area, for example, position P shown in Figure 6 ₂₄

Since position P in this example ₂₄Be center, detect the crest of tracking error signal to peak voltage value DPDTEV so in step 304, measure three differential phaes that obtain at monitoring window _PPO, DPDTEV _PPC and DPDTEV _PPI can distinguish correspondence position P ₂₃, P ₂₄And P ₂₅Be clear that measuring three differential phaes that obtain very much detects the crest of tracking error signal to peak voltage value DPDTEV _PPO, DPDTEV _PPC and DPDTEV _PPI will can be not bigger than the first preset critical DPDTE_LV, therefore, do not satisfy the Rule of judgment of step 306, but met the Rule of judgment in the step 310.As before described, though after the distance that has been moved M1 step-length, optical pick-up unit 102 is assumed to be that being positioned at system ideally introduces the district, yet identification logical one 14 in border is after execution in step 302, and do not know the physical location place of optical pick-up unit 102, also therefore when optical pick-up unit 102 at position P ₂₄The time, need to measure the crest of swinging signal at this moment to peak voltage value WOBV _PP(step 314).Then, the crest of this swinging signal is to peak voltage value WOBV _PPCompare with the second preset critical WOB_LV and to be used for producing second comparative result.

In this example, because optical pick-up unit 102 is in burst cutting area, so when execution in step 315, the crest of the swinging signal that is recorded is to peak voltage value WOBV _PPWill be bigger than the second preset critical WOB_LV, therefore, when optical pick-up unit 102 is positioned at position P ₂₄The time, need to measure the crest of radiofrequency signal at this moment to peak voltage value RFV _PP, be in the data field or in burst cutting area (step 320) in order to judge optical pick-up unit 102, and with the crest of radiofrequency signal to peak voltage value RFV _PPCompare with the 3rd preset critical RF_LV and to produce the 3rd comparative result, and in this example, because optical pick-up unit 102 is still in burst cutting area, so the crest of measured radiofrequency signal is to peak voltage value RFV _PPCan be bigger than the 3rd preset critical RF_LV.As shown in Figure 3, optical pick-up unit 102 will outwards be moved to upgrade monitoring window.Consult process flow diagram shown in Figure 3, step 318 will be repeated again and again optical pick-up unit 102 will be moved in the undefined district from burst cutting area.Since before described the ensuing operation of border identification flow process in detail, so further instruction just repeats no more in this omission.

See also Fig. 7, Fig. 7 is the process flow diagram of second example of step 207 and step 208 among Fig. 2.Note that if can reach identical result in fact, the sequence of steps that might not need to abide by in the flow process shown in Figure 7 is carried out.This flow process includes following steps:

Step 700: beginning.

Step 702: control system 110 control travel mechanisms 108 are with optical pick-up unit 102 a past interior mobile M4 step-length.

Step 704: border identification logical circuit 114 measures differential phae and detects the crest of tracking error signal to peak voltage value DPDTEV _PPC.

Step 705: identification logical circuit 114 in border detects differential phae on the crest of tracking error signal to peak voltage value DPDTEV _PPC and preset critical DPDTE_LV compare and produce comparative result.

Step 706: differential phae detects the crest of tracking error signal to peak voltage value DPDTEV _PPIs C than next big of preset critical DPDTE_LV? if then execution in step 710; Otherwise then execution in step 708.

Step 708: control system 110 control travel mechanisms 108 outwards move to another position with optical pick-up unit, then execution in step 704.

Step 710: control system 110 control travel mechanisms 108 are with the distance of the outside mobile M2 step-length of optical pick-up unit.

Step 712: finish.

In above-mentioned flow process example, be provided with two preset displacement amounts that two parameter M4 and M2 define optical pick-up unit 102 respectively.As shown in Figure 8, M4 is that parameter that needs are suitably defined allows the optical pick-up unit 102 can be by in undefined district of shift-in or the burst cutting area.For instance, if when border identification (search) when program begins, the reference position of optical pick-up unit 102 drops in the region R 4, and then the next position of optical pick-up unit 102 will be dropped in the region R 5.M2 is a definite value and can calculates according to track gauge and the controlling mechanism that is adopted (for example: step motor is controlled).Therefore the border of introducing the district when system is by after successfully identification is come out, in optical pick-up unit 102 system that just can correctly be moved on to by parameter M2 introduces and distinguishes.

Please also refer to Fig. 6 and Fig. 7, below provide an example clearly to describe out the disclosed identification system of Fig. 7 and introduce the flow process in district.When supposing that this flow process of border that optical pick-up unit 102 introduces the district in identification system at the beginning, suitably moved on in the region R 4 shown in Figure 8.In step 702, optical pick-up unit 102 according on the CD 10 from outer race track towards the radial direction of inner race track moved M4 step-length distance and in the non-definition, for example, position P shown in Figure 6 ₁₈

In step 704, when optical pick-up unit 102 at position P ₁₈The time, can measure to such an extent that a differential phae detects the crest of tracking error signal to peak voltage value DPDTEV _PPC.Next, measured differential phae detects the crest of tracking error signal to peak voltage value DPDTEV _PPC and preset critical DPDTE_LV compare and therefore produce comparative result.As previously mentioned, when being positioned at system, optical pick-up unit 102 introduces the district, the differential phae tracking error signal has significant amplitude, but work as optical pick-up unit 102 in undefined district or burst cutting area, the differential phae tracking error signal has only small insignificant amplitude, therefore, if indicating differential phae, the comparative result that obtains detects the crest of tracking error signal in step 705 to peak voltage value DPDTEV _PPC is not big than preset critical DPDTE_LV, just represents that optical pick-up unit 102 still is positioned at undefined district or burst cutting area.Yet, detect the crest of tracking error signal to peak voltage value DPDTEV if the comparative result that obtains in the step 705 indicates differential phae _PPC is bigger than preset critical DPDTE_LV, just represented optical pick-up unit 102 by shift-in system introduce the district, and introduce the border in district near system.In this example, because position P ₁₈Be positioned at undefined district, the comparative result that obtains in step 705 can indicate differential phae and detect the crest of tracking error signal to peak voltage value DPDTEV _PPC is not big than preset critical DPDTE_LV, thus step 708 be performed with optical pick-up unit 102 outwards moved N step-length distance and with optical pick-up unit 102 by the position renewal at present place to adjacent position P ₁₇Next, when optical pick-up unit 102 at position P ₁₇The time, the crest of measuring differential phae detection this moment tracking error signal is to peak voltage value DPDTEV _PPC, and measured differential phae detected the crest of tracking error signal to peak voltage value DPDTEV _PPC and preset critical DPDTE_LV compare, in this example, because position P ₁₇Therefore still be arranged in undefined district, execution in step 708 causes the current position of optical pick-up unit 102 to be updated to adjacent position P the distance of optical pick-up unit 02 an outside mobile N step-length once more ₁₆Since the position P at optical pick-up unit 102 present places ₁₆The crest of tracking error signal is detected to peak voltage value DPDTEV so the comparative result that obtains just can indicate the differential phae that records in the border that the system that is positioned at introduces the district and introduces the district near system in step 705 _PPC is bigger than preset critical DPDTE_LV.Next, optical pick-up unit 102 has outwards moved the distance of M2 step-length further.In this mode, optical pick-up unit 102 can be moved to the center that system introduces the district in most situation.

Here note that, by the justice such as execution circulation that execution in step 704, step 705, step 706 and step 708 constituted be: a plurality of positions in the radial direction that respectively optical pick-up unit 102 moved on to CD 10; Detect tracking error signal with reference to differential phae and obtain a plurality of correspondences indicated value of position (for example: crest is to the peak voltage value) in the radial direction; A plurality of indicated values and predetermined critical compared produce a plurality of comparative results; Then pick out the border that system introduces the district according to a plurality of comparative results.

In aforementioned flow process example shown in Figure 7, the numerical value of M4 is in advance default and adjustable, that is to say, just planned before flow process shown in Figure 7 begins, yet this only is to be used for the usefulness of explanation, does not constitute restrictive condition of the present invention.In other design, the displacement that optical pick-up unit 102 is moved inward also be can't help any pre-if predetermined controlling value and is controlled, for instance, in another embodiment, step 702 can be adjusted to and continue to monitor differential phae detect the crest of tracking error signal to peak voltage value DPDTEV in the process that optical pick-up unit 102 moves inward _PPC.Introduce the district when optical pick-up unit 102 from system and entered undefined district, differential phae detects the crest of tracking error signal to peak voltage value DPDTEV _PPC will have a pressure drop, according to the pressure drop that is detected, therefore the driving force of mobile optical reading unit 102 can stop, yet, optical pick-up unit 102 is because the cause of inertia will continue to move a bit of distance, cause stopping when mobile when optical pick-up unit 102, the instantaneous position of optical pick-up unit 102 can be positioned at undefined district and introduce district and border between the two, undefined district near system.Next, step 704 step 710 of script can be performed optical pick-up unit 102 is moved on to the center that system introduces the district among Fig. 7.In a word, suppose that optical pick-up unit 102 can successfully be moved on to the burst cutting area that undefined district maybe may exist, optical pick-up unit 102 is moved on to undefined district/may exist burst cutting area displacement may with predetermined programmable setting value or by any feasible dynamically or the Adaptive Control mode come displacement is controlled.More than these design variation all meet the present invention's spirit, and drop among the category of the present invention.

Disclose based on aforesaid technology, the interior broad method of the optical pick-up unit system that moves on to being introduced the district comprises following steps: start focus servo control under the state that does not start circulation orbital servo control, then, radial direction mobile optical reading unit in this CD; When moving, this radial direction obtains at least one first reference signal according to this optical pick-up unit by CD institute laser light reflected; And monitor at least one first reference signal and come the system of identification CD to introduce the border in district.

If can learn the disk types (for example) of CD 10 in advance, just do not need three whole reference signals to come identification system to introduce the border in district from a user's input.For instance, if the user is read-only HD-DVD CD or blank write formula HD-DVD CD by telepilot or any possible mode HD-DVD CD that 100 inputs are loaded to information regenerator, then border identification logical circuit 114 can only be monitored the amplitude change that differential phae detects tracking error signal and come identification system to introduce the border in district; Similarly, if the user is input to information regenerator 100 with disk types for the information that can write formula HD-DVD CD, border identification logical circuit 114 also can only pick out the border in system introducing district by the amplitude change of monitoring swinging signal.These design variation all belong to category of the present invention.

Please be simultaneously with reference to Fig. 1 and Fig. 9, Fig. 9 is the process flow diagram of second embodiment of display message regenerating unit 100 according to the present invention.Note that if can reach identical result in fact, the sequence of steps that might not need to abide by in the flow process shown in Figure 9 is carried out in regular turn.This flow process includes following steps:

Step 902: with CD 10 load information regenerating units 100.

Step 904: control system 110 control travel mechanisms 108 move inward optical pick-up unit 102.

Has step 906: optical pick-up unit 102 arrived the predeterminated position by limit switch 112 decisions? if then execution in step 908; Otherwise then execution in step 904, and optical pick-up unit 102 is moved toward interior constantly.

Step 908: control system 110 control travel mechanisms 108 are with the distance of optical pick-up unit 102 an outside mobile M5 step-length.

Step 910: control system 110 starts Spindle Motor 101 and begins rotary CD 10.

Step 912: control system 110 starts focus servo control in the servo-drive systems 106 with the imprinting layer of Focus hold on CD 10 by the laser beam of optical pick-up unit 102 outputs; Then starting circulation orbital servo control in the servo-drive system 106 comes the track on the CD 10 imprinting layers that the formed laser spots of laser beam by optical pick-up unit 102 outputs is locked on the track on the CD 10.

Step 914: optical pick-up unit 102 reading systems are introduced information, for example CD specification kind (optical disc types), imprinting mark polarity (indicating CD or CD from high to low from low to high), burst cutting area sign, trade shape, disc sign indicating number (being that CD is made sign indicating number) or the like.

Step 916: control system 110 control travel mechanisms 108 introduce the district with the system that optical pick-up unit 102 shifts out CD 10.

Step 918: control system 110 is introduced the system's introducing information that reads the district according to the system from CD 10 and is set servo parameter.

Step 920: the servo parameter that control system 110 sets according to step 918 comes Control Servo System 106 that focus servo control and circulation orbital servo control suitably are set.Then, the operation according to information regenerator 100 starts focus servo control, circulation orbital servo control or starts two kinds of servocontrol simultaneously.For instance, when optical pick-up unit 102 reads the data that are stored in CD 10 middle orbits, focus servo control and circulation orbital servo control this moment all is the state that is starting.

In the flow process example of above-mentioned Fig. 9, parameter M5 is set a preset displacement amount that defines optical pick-up unit 102.As what in Figure 10, show, M5 is that a parameter that need suitably be defined makes optical pick-up unit 102 be introduced in the district by the shift-in system from some ad-hoc locations of being settled by limit switch, and the difference of embodiment shown in Figure 9 and embodiment shown in Figure 2 is that the flow process among Fig. 9 does not comprise the border seek operations that system introduces the district, on the contrary, limit switch 112 is used to detection optical reading unit 102 and whether has arrived the ad-hoc location that is determined by limit switch 112.Since when information regenerator 100 was manufactured, the position of this limit switch 112 was exactly known and fixing, therefore after parameter M5 is suitably set, can guarantee that optical pick-up unit 102 can be introduced the center of distinguishing by the shift-in system.In addition, note that, do not detect tracking error signal, radiofrequency signal or swinging signal because do not need to use differential phae, so before the distance of the outside mobile M5 step-length of optical pick-up unit 102, circulation orbital servo control system allows to keep closing state.

Please be simultaneously with reference to Fig. 1 and Figure 11, Figure 11 is the process flow diagram of the 3rd embodiment of display message regenerating unit 100 of the present invention.Note that if can reach identical result in fact, the sequence of steps that might not need to abide by in the flow process shown in Figure 11 is carried out in regular turn.This flow process includes following steps:

Step 1100: with CD 10 load information regenerating units 100.

Step 1101: control system 110 startup optical pick-up units 102 give off laser beam on the CD 10.

Step 1102: control system 110 starts Spindle Motor 101 and begins rotating disc 10 with a required rotating speed.

Step 1104: control system 110 Control Servo System 106 start focus servo control with the imprinting layer of Focus hold on CD 10 (for example HD-DVD CD) by the laser beam of optical pick-up unit 102 output.

Step 1106: control system 110 Control Servo System 106 start circulation orbital servo control and will be locked on the track of CD 10 by the formed laser spots of laser beam of optical pick-up unit 102 outputs with the track on CD 10 imprinting layers.

Step 1108: before the disk types of CD 10 was picked out, the introducing district from CD 10 read information.

Step 1110: control system 110 is according to introducing the disk types that district's information identification goes out CD 10.

Suppose that optical pick-up unit 102 has two laser diodes, be used for sending red laser respectively reading the DVD CD with longer wavelength, and send have shorter wavelength blue laser to read the HD-DVD CD.In step 1100, control system 110 can start the laser diode that can send the blue laser beam with shorter wavelength in better embodiment.In ensuing description, just step 1102 is to step 1106, and Spindle Motor 101, focus servo control and circulation orbital servo control all are under the state of startup.In the present embodiment, optical pick-up unit 102 can (for example: the system on the HD-DVD introduces the district) read information from the introducing district on the CD 10 before the disk types of CD 10 is picked out.Note that, previously mentioned one of them mechanism or any mode that optical pick-up unit 102 shift-in systems can be introduced the district with optical pick-up unit 102 immigration systems introducing district all can be applicable to allow in the flow process shown in Figure 11 optical pick-up unit 102 to be convenient to successfully read in the step 1108 desired introducing information before the disk types of CD 10 is come out by identification, for instance, step 904,906 and 908 is added between step 1100 and the step 1101.Yet, note that this only is used for the usefulness of explanation, does not constitute restriction of the present invention.Generally speaking, the introducing district of CD 10 has comprised the information of corresponding disk types, and therefore, control system 110 can be by indicating the disk types that is loaded CD 10 with reference to the introducing information of reading easily from CD 10.

Note that, hardware structure shown in Figure 1 is supported aforementioned all mechanism, these mechanism are that control optical pick-up unit 102 immigration systems introduce in the district, and then access is stored in wherein introducing information, yet, shown hardware configuration does not constitute restriction of the present invention, for instance, if because the demand in the design, by using limit switch 112 that the mechanism that optical pick-up unit 102 immigration systems introduce the district is not needed to be supported by information regenerator 100, promptly can dispense the limit switch 112 in the information regenerator 100.In a word, any one control optical pick-up unit that has used the front to narrate comes the shift-in system to introduce the district and the information regenerator that then is accessed in introducing information wherein all belongs to category of the present invention.

The above only is a better embodiment of the present invention, and all equalizations of being done according to claim scope of the present invention change and modify, and all should belong to covering scope of the present invention.

Claims

1. the method for an access CD, this method includes:

Under the situation that does not start circulation orbital servo control, start focus servo control, then the radial direction of optical pick-up unit along described CD moved;

When described optical pick-up unit when described radial direction moves, respectively described optical pick-up unit is moved to described a plurality of ad-hoc locations in the radial direction of described CD, obtain at least one first reference signal and at least one second reference signal according to laser beam by described CD reflection;

Obtain corresponding with described described a plurality of ad-hoc locations in the radial direction of described CD respectively a plurality of first indicated values with reference to described first reference signal;

Described a plurality of first indicated values and first preset critical compared produce a plurality of first comparative results;

Described second reference signal of reference obtains one of them the second corresponding indicated value with described a plurality of ad-hoc locations;

Described second indicated value and second preset critical compared produce second comparative result; And

Pick out the described border in described preset data district according to described a plurality of first comparative results and described second comparative result.

2. the method for access CD as claimed in claim 1 is characterized in that, described first reference signal is that differential phae detects tracking error signal, and described second reference signal is a swinging signal.

3. the method for access CD as claimed in claim 1 is characterized in that, the step that picks out the described border in described preset data district according to described a plurality of first comparative results and described second comparative result includes:

When the size of two continuous comparative results among described a plurality of first comparative results is different each other, pick out the described border in described preset data district according to described second comparative result.

4. the method for access CD as claimed in claim 3, it is characterized in that, described two continuous comparative results are corresponding with the primary importance and the second place respectively, and described second indicated value is corresponding with one of them of described primary importance and the described second place.

5. the method for access CD as claimed in claim 4 is characterized in that, the described radial direction of described CD comprises by inner race track towards the first direction of outer race track and the second direction opposite with described first direction; Described optical pick-up unit moves according to the monitoring window that includes described a plurality of ad-hoc locations, and wherein said monitoring window moves according to present direction selected in described first, second direction and comprises described a plurality of ad-hoc location; And described optically read unit also included along the step that the described radial direction of described CD moves:

When identification is come out not according to described second comparative result on the described border in described preset data district, move described optical pick-up unit and upgrade position in the described monitoring window, wherein said monitoring window moves with described present direction.

6. the method for access CD as claimed in claim 4 is characterized in that, the described radial direction of described CD comprises by inner race track towards the first direction of outer race track and the second direction opposite with described first direction; Described optical pick-up unit moves according to the monitoring window that includes described a plurality of ad-hoc locations, and wherein said monitoring window moves according to the present direction of selecting in described first, second direction and comprises described a plurality of ad-hoc location; And described optical pick-up unit also included along the step that the described radial direction of described CD moves:

When described a plurality of first comparative results do not have two corresponding predefined results of different each other and whole described a plurality of first comparative results of continuous comparative result, then move described optical pick-up unit and upgrade the interior position of described monitoring window, wherein said monitoring window moves with described present direction;

Not have two continuous comparative results different each other and all described a plurality of first comparative results and described predefined result then move described optical pick-up unit to upgrade the position in the described monitoring window according to described second comparative result at once when described a plurality of first comparative results.

7. the method for access CD as claimed in claim 6 is characterized in that, moves the step that described optical pick-up unit upgrades the position in the described monitoring window according to described second comparative result and also includes:

When described second comparative result indicates described second indicated value greater than described second preset critical, move described optical pick-up unit and upgrade position in the described monitoring window, wherein said monitoring window moves with described present direction; And

When described second comparative result indicates described second indicated value when being not more than described second preset critical, upgrade described present direction in the opposite direction, then move described optical pick-up unit to upgrade the position in the described monitoring window, wherein said monitoring window moves with described reverse direction.

8. the method for access CD as claimed in claim 6 is characterized in that, the step that obtains described first reference signal and described second reference signal also includes according to the described laser by described CD reflection and obtains radiofrequency signal; And move described optical pick-up unit according to described second comparative result and include with the step of upgrading the position in the described monitoring window:

When described second comparative result indicates described second indicated value greater than described second preset critical:

Obtain and one of them the 3rd corresponding indicated value of described a plurality of ad-hoc locations with reference to described radiofrequency signal;

Described the 3rd indicated value and the 3rd preset critical are relatively produced the 3rd comparative result; And

Move described optical pick-up unit according to described the 3rd comparative result and upgrade position in the described monitoring window; And

When described second comparative result indicates described second indicated value when being not more than described second preset critical, upgrade described present direction in the opposite direction, then move described optical pick-up unit and upgrade the interior position of described monitoring window, wherein said monitoring window moves with described reverse direction.

9. the method for access CD as claimed in claim 8 is characterized in that, moves the step that described optical pick-up unit upgrades the position in the described monitoring window according to described the 3rd comparative result and includes:

When described the 3rd comparative result indicates described the 3rd indicated value greater than described the 3rd preset critical, upgrade described present direction with described reverse direction, then move described optical pick-up unit and upgrade the interior position of described monitoring window, wherein said monitoring window moves with described reverse direction; And

When described the 3rd comparative result indicates described the 3rd indicated value when being not more than described the 3rd preset critical, move described optical pick-up unit and upgrade position in the described monitoring window, wherein said monitoring window moves with described present direction.

10. the method for access CD as claimed in claim 8 is characterized in that, described first reference signal is that differential phae detects tracking error signal, and described second reference signal is a swinging signal.

11. the method for access CD as claimed in claim 1 is characterized in that, described CD meets the HD-DVD specification, and described preset data district is that system introduces the district.

12. the method for an access CD, this method includes:

Under the situation that does not start circulation orbital servo control, start focus servo control, then move described optical pick-up unit with first direction and make the position of described optical pick-up unit between the center of the border in preset data district and described CD according to the preset displacement amount, then move described optical pick-up unit according to second direction, the radial direction of wherein said CD comprises by the described first direction of inner race track towards outer race track, and the described second direction opposite with described first direction;

When described optical pick-up unit moves with described radial direction, respectively described optical pick-up unit is moved to described a plurality of ad-hoc locations in the radial direction of described CD, according to the indicated value that obtains corresponding above-mentioned ad-hoc location by described CD institute laser light reflected bundle; And

Described indicated value and preset critical are relatively produced comparative result, and come the described border in the described preset data of identification district according to described comparative result.

13. the method for access CD as claimed in claim 12, it is characterized in that, the step that moves described optical pick-up unit according to described second direction includes: when identification is come out not according to described comparative result on the described border in described preset data district, described optical pick-up unit is moved to next ad-hoc location.

14. the method for access CD as claimed in claim 13 is characterized in that, described CD meets the HD-DVD specification, and described preset data district is that system introduces the district.

15. an information regenerator, this information regenerator includes:

Optical pick-up unit is used for the access CD;

Travel mechanism, it is couple to described optical pick-up unit;

Servo-drive system, it is couple to described optical pick-up unit, and described servo-drive system has focus servo control and circulation orbital servo control;

Control system, it is couple to described servo-drive system and described travel mechanism, described control system is controlled described servo-drive system and is used for starting described focus servo control under the situation that does not start the control of described circulation orbital servo, then controls described travel mechanism described optical pick-up unit is moved the described a plurality of ad-hoc locations in the radial direction that respectively described optical pick-up unit moved to described CD along the radial direction of described CD;

Signal processing unit, it is couple to described optical pick-up unit, and described signal processing unit obtains at least one first reference signal and at least one second reference signal according to the laser beam by described CD reflection at described optical pick-up unit when described radial direction moves; And

Border identification logical circuit, it is couple to described signal processing unit, described border identification logical circuit obtains corresponding with described described a plurality of ad-hoc locations in the radial direction of described CD respectively a plurality of first indicated values with reference to described first reference signal, described a plurality of first indicated values and first preset critical compared produce a plurality of first comparative results, described second reference signal of reference obtains one of them the second corresponding indicated value with described a plurality of ad-hoc locations, described second indicated value and second preset critical compared produce second comparative result, then pick out the described border in described preset data district according to described a plurality of first comparative results and described second comparative result.

16. information regenerator as claimed in claim 15 is characterized in that, described first reference signal is that differential phae detects tracking error signal, and described second reference signal is a swinging signal.

17. information regenerator as claimed in claim 16, it is characterized in that, when the size of described border identification logical circuit two continuous comparative results among described a plurality of first comparative results is different each other, pick out the described border in described preset data district according to described second comparative result.

18. information regenerator as claimed in claim 17 is characterized in that, described two continuous comparative results are corresponding with the primary importance and the second place respectively, and one of them of described second indicated value and described primary importance and the described second place is corresponding.

19. information regenerator as claimed in claim 18 is characterized in that, the described radial direction of described CD comprises by inner race track towards the first direction of outer race track and the second direction opposite with described first direction; Described optical pick-up unit moves according to the monitoring window that includes described a plurality of ad-hoc locations, and wherein said monitoring window moves to comprise described a plurality of ad-hoc location according to the selected present direction of described first, second direction; And when identification is come out not according to described second comparative result on the described border in described preset data district, described control system is controlled described travel mechanism and is moved described optical pick-up unit and upgrade position in the described monitoring window, and wherein said monitoring window moves with described present direction.

20. information regenerator as claimed in claim 19 is characterized in that, the described radial direction of described CD comprises by inner race track towards the first direction of outer race track and the second direction opposite with described first direction; Described optical pick-up unit moves according to the monitoring window that includes described a plurality of ad-hoc locations, and wherein said monitoring window is according to comprising described a plurality of ad-hoc location by the selected present direction of described first, second direction; When described a plurality of first comparative results do not have two continuous comparative results different each other and all described a plurality of first comparative results not with predefined result at once, described control system is controlled described travel mechanism and is moved described optical pick-up unit and upgrade position in the described monitoring window, and wherein said monitoring window moves with described present direction; And not have two continuous comparative results different each other and all described a plurality of first comparative results and described predefined result are at once when described a plurality of first comparative results, and then described control system is controlled described travel mechanism and moved described optical pick-up unit according to described second comparative result and upgrade position in the described monitoring window.

21. information regenerator as claimed in claim 20, it is characterized in that, when described second comparative result indicates described second indicated value greater than described second preset critical, described control system is controlled described travel mechanism and is moved described optical pick-up unit and upgrade position in the described monitoring window, and wherein said monitoring window moves with described present direction; And indicate described second indicated value when being not more than described second preset critical when described second comparative result, described control system is controlled described travel mechanism and is upgraded described present direction in the opposite direction, follow described control system and control described travel mechanism and move described optical pick-up unit and upgrade position in the described monitoring window, wherein said monitoring window moves according to described reverse direction.

22. information regenerator as claimed in claim 21 is characterized in that, described signal processing unit also obtains radiofrequency signal by the described laser of described CD reflection; When described second comparative result indicates described second indicated value greater than described second preset critical, the described radiofrequency signal of described border identification logical circuit reference obtains one of them the 3rd corresponding indicated value with described a plurality of ad-hoc locations, and described the 3rd indicated value and the 3rd preset critical relatively produced the 3rd comparative result, and described control system is controlled described travel mechanism in addition and is moved described optical pick-up unit according to described the 3rd comparative result and upgrade position in the described monitoring window; When described second comparative result indicates described second indicated value to be not more than described second preset critical, described control system is controlled described travel mechanism and is upgraded described present direction in the opposite direction, follow described control system and control described travel mechanism and move described optical pick-up unit and upgrade position in the described monitoring window, wherein said monitoring window moves with described reverse direction.

23. information regenerator as claimed in claim 22, it is characterized in that, when described the 3rd comparative result indicates described the 3rd indicated value greater than described the 3rd preset critical, described control system is controlled described travel mechanism and is upgraded described present direction with described reverse direction, follow described control system and control described travel mechanism and move described optical pick-up unit and upgrade position in the described monitoring window, wherein said monitoring window moves with described reverse direction; And indicate described the 3rd indicated value when being not more than described the 3rd preset critical when described the 3rd comparative result, described control system is controlled described travel mechanism and is moved described optical pick-up unit and upgrade position in the described monitoring window, and wherein said monitoring window moves with described present direction.

24. information regenerator as claimed in claim 22 is characterized in that, described first reference signal is that differential phae detects tracking error signal, and described second reference signal is a swinging signal, and described the 3rd reference signal is a radiofrequency signal.

25. information regenerator as claimed in claim 15 is characterized in that, described CD meets the HD-DVD specification, and described preset data district is that system introduces the district.

26. an information regenerator, this information regenerator includes:

Optical pick-up unit is used for the access CD;

Travel mechanism, it is couple to described optical pick-up unit;

Control system, it is couple to described servo-drive system and described travel mechanism, described control system is to be used for controlling described servo-drive system to start described focus servo control under the situation that does not start described circulation orbital servo control, then and control described travel mechanism and move described optical pick-up unit according to the preset displacement amount with first direction and make the position of described optical pick-up unit between the center of the border in preset data district and described CD, then and according to second direction move described optical pick-up unit, the radial direction of wherein said CD includes by inner race track towards the described first direction of outer race track and the described second direction opposite with described first direction;

Signal processing unit, it is couple to described optical pick-up unit, described signal processing unit be described optical pick-up unit when described radial direction moves according to the corresponding indicated value that obtains by described CD institute laser light reflected bundle with ad-hoc location; And

Border identification logical circuit, it is couple to described signal processing unit, and described border identification logical circuit relatively produces comparative result to described indicated value and preset critical, and according to the described border in the described preset data of described comparative result identification district; And when identification was come out not according to described comparative result on the described border in described preset data district, described control system was controlled described travel mechanism described optical pick-up unit is moved to next ad-hoc location.

27. information regenerator as claimed in claim 26 is characterized in that, described CD meets the HD-DVD specification, and described preset data district is that system introduces the district.