CN1275238C - Reading optical recording media trace hopping apparatus and its position detecting method - Google Patents
Reading optical recording media trace hopping apparatus and its position detecting method Download PDFInfo
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- CN1275238C CN1275238C CN 03130891 CN03130891A CN1275238C CN 1275238 C CN1275238 C CN 1275238C CN 03130891 CN03130891 CN 03130891 CN 03130891 A CN03130891 A CN 03130891A CN 1275238 C CN1275238 C CN 1275238C
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Abstract
The present invention discloses a track skipping device for reading an optical recording medium and a position detecting method thereof. The track skipping device can move a light spot of a laser beam from a present track on a disk to a target track on the disk, and can stably and accurately control the track spanning speed and the track spanning position in a track skipping process; in addition, the track spanning speed can be accurately controlled within the control range of a track servo loop at the track locking time without influencing the stability of the servo control loop; in the track position detecting part, the track skipping device generates a track position through conversion according to a linear region part of a track error signal and a focusing summation signal by adopting a mixed track detecting method.
Description
Technical field
The present invention relates to a kind of track jump apparatus, particularly relate to a kind of optics that utilizes data storage is had the recording medium of track one, and stable and control it exactly and when striding the rail reading of data, stride rail speed and position.
Background technology
Along with the density of optical disk is more and more higher, (track pitch) is more and more littler for the rail of disc, track error signal (track error signal, it is also more and more narrow that the lock criterion that TES) can provide is enclosed (pull-in range), will make jump onto the tracks (track jump) improve at lock rail degree of difficulty when (pull-in).Therefore, when the lock rail, the control of striding rail speed (track cross velocity) just becomes extremely important, if when the lock rail, stride rail speed and surpassed the control frequency range scope (control band) of track servo loop (tracking servo loop),, must jump onto the tracks again causing the luminous point of laser beam can't be positioned at target track, make time for reading increase, will have influence on the stability of track servo loop when more serious.
For fear of the problems referred to above, in United States Patent (USP) 5497360 and United States Patent (USP) 5566148, a kind of track jump apparatus has been proposed, this device can be detected the rail speed of striding when jumping onto the tracks, and utilize a default reference velocity (predetermined reference velocity profile) and a stability controller (stabilization controller) to control the rail speed of striding when jumping onto the tracks, make the margin of error of striding between rail speed and the reference velocity to be minimized.The method that rail speed is striden in the detecting of this device is that the digitizing zeroth order crossover signal (digitized zero cross signal) with track error signal and radio-frequency ripple signal (radio frequency ripple signal) or focusing summation signals (focus sum signal) is the source, (time period) obtained striding rail speed the time cycle of digitizing zeroth order crossover signal when rail was striden in calculating, and the mode of collocation frequency control is done closed loop control (close loop control).No. 5497360 patent of the U.S. and track jump apparatus that No. 5566148 patent proposed be owing to adopt closed loop control in the control of striding rail speed, therefore the rail speed of striding in the process of jumping onto the tracks can be controlled in comparatively the scope near reference velocity.
But this mode also has other problem, and for example, striding rail speed must just can detect when digitizing zeroth order crossover signal generation zeroth order is crossed over, and it is very serious therefore to detect time delay.In addition when striding rail speed when slow, the cycle that can cause digitizing zeroth order crossover signal generation zeroth order to cross over reduces, be that the sampling frequency of frequency control descends and limited the control frequency range of track jump apparatus, make track jump apparatus be easier to be subjected to the external disturbance influence relatively, as the eccentric characteristic of disc and the change of optical read head driving mechanism friction force state etc.
In addition, owing to stride rail speed and do not fix, with the sampling frequency that causes frequency control is not fixing, and then cause and in the control of striding rail speed, be easy to generate bigger phenomenon (overshoot) and the steady-state error (steady state error) of surmounting, make that striding rail speed when the lock rail can't be controlled within the control frequency range scope of track servo loop exactly, thereby have influence on the stability of track servo loop, cause the luminous point of laser beam can't be positioned at target track, must jump onto the tracks again like this, make time for reading increase, when more serious, the stability of track servo loop when having influence on tracking rail mode.
In order to solve above-mentioned these problems, No. 6442111 patent of the U.S. provides a kind of mode of linear position detecting, utilizes track error signal to detect laser beam spots relative position with respect to disc when striding rail.Because when striding rail, track error signal can be because the relative position of laser beam spots and disc track changes, make track error signal have sine wave or the generation of the signal of sawtooth wave, No. 6442111 patent of the U.S. is to design linear position detection method according to this phenomenon, utilizes track error signal to detect the relative position of laser beam spots and disc track.
No. 6442111 patent is by setting up the mode of a conversion table (conversion table), track record error signal and laser beam spots are with respect to the relation of disc orbital position, make track jump apparatus when jumping onto the tracks, can utilize track error signal to change out the position of laser beam spots by conversion table with respect to the disc track.Utilize the method, track jump apparatus can obtain linear position (linearization position) at any time and do closed loop control, and need not adopt the frequency control system of No. 5497360 patent of the similar U.S. and No. 5566148 patent of the U.S..Therefore the detecting of the method is minimum time delay, and sampling frequency is fixed, and can stablize and the rail speed of striding when control is jumped onto the tracks exactly.
Because track error signal is non-linear with the relation of corresponding linear position, and not corresponding one to one, therefore the differential of No. 6442111 patent utilization track error signal of the U.S. or focusing summation signals (focus sum signal) are auxiliary, the relation of track error signal and linear position is divided into three zones, and make in each zone, track error signal is corresponding one to one with the relation of linear position, utilizes conversion table to come the nonlinearities change of track record error signal again.But even so, this method still has problem to exist when the detecting linear position.
Because U.S.'s linear position method for detecting that No. 6442111 patent proposed is to utilize track error signal to come the transfer linearity position by the mode of conversion table, therefore be not suitable for adopting mimic channel to realize, proper mode is to utilize digital signal processor or digital circuit to realize.In case adopt digital signal processor or digital circuit, just must utilize analog-digital converter to convert track error signal to digital signal with focusing on summation signals, so the resolution of analog-digital converter and the word length influences that factor caused such as (word length) of digital signal processor just must take in.
In addition, because track error signal change amount signal when peak value (peak) is less, add the noise of track error signal itself, make analog-digital converter when the sampling track error signal, can will cause the conversion of linear position to produce distortion at different position samples to identical track error signal.When the analog-digital converter effective resolution was not enough, this distortion was with even more serious.The distortion of linear position can have influence on track jump apparatus is striden rail speed in control stability on the contrary.
Summary of the invention
In view of above problem, fundamental purpose of the present invention is to provide a kind of track jump apparatus, the mode of utilizing a kind of hybrid orbital position to detect (hybrid track position detection) is detected the relative position of laser beam spots and disc track, and this mode more can not be subjected to the influence of analog-digital converter resolution, resulting orbital position distortion is also less, track jump apparatus can stablize and exactly control stride rail speed and orbital position when jumping onto the tracks.This device can move to other target track by track present on the disc with the luminous point of laser beam, in the process of jumping onto the tracks, stride rail speed can with orbital position be stabilized and exactly control, when the lock rail, stride rail speed and can be controlled at exactly within the control frequency range scope of track servo loop, will can not have influence on the stability of servo control loop.
Therefore, for reaching above-mentioned purpose, the disclosed track jump apparatus of the present invention mainly is made up of a position control unit, comprising hybrid orbital position detecting unit, position add up unit, compensating unit, position command generation unit and lock rail detecting unit, subtrator and switch unit; Wherein hybrid orbital position detecting unit more includes the first offset compensation unit, the second offset compensation unit, the first peak value detecting unit, the first side-play amount detecting unit, the second peak sensing unit, the second side-play amount detecting unit, first gain compensation unit, second gain compensation unit, the first gain calculating unit, the second gain calculating unit, hybrid orbital position computing unit and a supplemental characteristic file.
Wherein, actuating unit is used to drive an optical read head corresponds to data-track with generation on the data-track of optical record medium with projecting laser Shu Guangdian information; Prime amplifier produces a track error signal and according to the information that corresponds to this data-track and focuses on summation signals; One microprocessor unit is used to provide the order of jumping onto the tracks; One position control unit, when position control unit does not receive when jumping onto the tracks order, optical read head will be positioned on the current track, and receive track error signal to produce the position of control signal control actuating unit, when position control unit receives when jumping onto the tracks order, optical read head will be moved on the target track by current track, and receive track error signal and focus on summation signals and stride rail speed and orbital position with what produce control signal control actuating unit.Wherein, this position control unit includes:
One hybrid orbital position detecting unit is exported a track position signal and a regional switching signal according to this track error signal and this focusing summation signals;
The track position signal that adds up according to this track position signal and should the zone switching signal calculate the orbital position that adds up at present, and is exported in the unit that adds up, one position;
One position command generation unit and lock rail detecting unit produce a target location command signal and a lock rail signal in order to the order of jumping onto the tracks according to this, and this laser beam spots is moved to target track by current track;
One subtrator is exported a position error signal according to this add up track position signal and this target location command signal; And
One switches the unit, according to accurate of this lock rail voltage of signals to receive this track error signal or to receive this position error signal.
Hybrid orbital position method for detecting proposed by the invention, be to change the generation orbital position according to track error signal and the range of linearity part that focuses on summation signals, because track error signal is obvious than nonlinear area with the variation that focuses on summation signals when the range of linearity, more can not cause the distortion of signal because of analog-digital converter sampling influence.The less orbital position of distortion when jumping onto the tracks, can provide stable and more accurately feedback signal to position control unit, so that laser beam spots is moved to target track by current track, and in moving process, stride that rail speed and orbital position can be stabilized and control exactly, when the lock rail, stride rail speed and more can be controlled among the control frequency range scope of track servo loop, laser beam spots can be positioned at target track with being stabilized.In addition, the present invention does not need to describe in the mode of building table the relation of track error signal, focusing summation signals and orbital position.
About characteristics of the present invention and embodiment, conjunction with figs. is done being described in detail as follows of most preferred embodiment now.
Description of drawings
Fig. 1 is the system block diagram of disclosed track jump apparatus;
Fig. 2 is the system block diagram of disclosed track jump apparatus middle orbit position detecting unit;
Fig. 3 is the principle of disclosed hybrid orbital position detecting unit;
Fig. 4 A～Fig. 4 B is the process flow diagram that disclosed hybrid orbital position detecting unit is judged transition region; And
Fig. 5 is the experimental result of disclosed track jump apparatus first experimental example;
Fig. 6 is the experiment condition of second experimental example of disclosed track jump apparatus;
Fig. 7 is the experimental result of second experimental example of disclosed track jump apparatus;
Fig. 8 is the experiment condition of the 3rd experimental example of disclosed track jump apparatus; And
Fig. 9 is the experimental result of the 3rd experimental example of disclosed track jump apparatus.
Wherein: 101-optical record medium, 102-optical read head, 103-actuating unit, the 104-prime amplifier, the 105-driver element, 106-position control unit, the hybrid orbital position detecting unit of 107-, the 108-unit that adds up the position, the 109-compensating unit, 110-microprocessor unit, 111-position command generation unit and lock rail detecting unit, the 112-subtrator, the 113-switch unit, the 201-first offset compensation unit, the 202-second offset compensation unit, the 203-first peak value detecting unit, the 204-first side-play amount detecting unit, the 205-second peak sensing unit, the 206-second side-play amount detecting unit, 207-first gain compensation unit, 208-second gain compensation unit, the 209-first gain calculating unit, the 210-second gain calculating unit, 211 hybrid orbital position computing units, 212-supplemental characteristic file;
In Fig. 4 A and Fig. 4 B, wherein,
Step 401...........0≤SUM
NORM≤ Level1P
Step 404...........TES
NORM〉=0
Step 405...........TES
NORM〉=0
Step 408...........HTP=HTP2-(SUM
NORM/ Level1P) * (HTP2-HTP1)
Step 409...........HTP=-HTP2+ (SUM
NORM/ Level1P) * (HTP2-HTP1)
Step 410...........HTP=HTP2-(SUM
NORM/ Level1N) * (HTP3-HTP2)
Step 411...........HTP=-HTP2+ (SUM
NORM/ Level1N) * (HTP3-HTP2)
The Jump order of jumping onto the tracks
TrkNo..... the rail number of jumping onto the tracks
Pull-in... lock the rail control signal
POS
CMD... .... the target location command signal
TES....... track error signal
SUM....... focus on summation signals
HTP....... position signalling
AREA...... regional switching signal
POS
HTP... .... track position signal adds up
POS
ERR... .... position error signal
TES
MAX... .... the track error signal maximal value
TES
MIN... .... the track error signal minimum value
SUM
MAX... .... focus on the summation signals maximal value
SUM
MIN... .... focus on the summation signals minimum value
TES
OFFSET... .... first side-play amount
SUM
OFFSET... .... second side-play amount
TES
NORM... ... the standardization track error signal
SUM
NORMStandardization summation focus signal
Embodiment
The system block diagram of disclosed track jump apparatus please refer to Fig. 1.This track jump apparatus can be used for reading in the reading system of optical record medium, for example the CD-ROM drive of DVD discs.
In the track jump apparatus shown in Fig. 1, comprise optical record medium 101, optical read head 102, actuating unit 103, prime amplifier 104, driver element 105, position control unit 106 and microprocessor unit 110.Wherein, position control unit 106 is made of with switch unit 113 add up unit 108, compensating unit 109, position command generation unit and lock rail detecting unit 111, subtrator 112 of hybrid orbital position detecting unit 107, position.Below the function of the above component units of explanation and running concern.
Microprocessor unit 110 is to be used for producing the order Jump that jumps onto the tracks to count TrkNo with the rail of jumping onto the tracks and give position control unit 106, position control unit 106 according to the order Jump that jumps onto the tracks to switch switch unit 113.When position control unit 106 does not receive when jumping onto the tracks order Jump, switch unit 113 switches to the output terminal that an output has track error signal, then the track servo loop is at tracking rail mode (track followingmode), the luminous point of laser beam will be positioned on the present track, when position control unit 106 receives when jumping onto the tracks order Jump, 113 output terminals that switch to subtrator 112 of switch unit, then the track servo loop is at jumping out of rail mode.That is the present pattern of track servo loop is according to microprocessor unit 110 whether jump onto the tracks order decision of output one to be arranged.
Position command generation unit and lock rail detecting unit 111 are to count TrkNo with the rail of jumping onto the tracks, target location order when jumping onto the tracks with generation (objectposition profile) and the lock rail control signal Pull-in that produces switching switch unit 113 according to the order Jump that jumps onto the tracks that microprocessor unit 110 is exported.
When order Jump was jumped onto the tracks in microprocessor unit 110 output one, then position command generation unit and lock rail detecting unit 111 were exported the lock rail control signal of an electronegative potential according to this order of jumping onto the tracks, and make switch unit 113 switch to subtrator 112 outputs.Simultaneously, position command generation unit and lock rail detecting unit 111 will be counted TrkNo to produce target location command signal POS according to the rail of jumping onto the tracks that microprocessor unit 110 is exported
CMD, this moment, the track servo loop was at jumping out of rail mode.Simultaneously, whether position command generation unit and lock rail detecting unit 111 luminous point that will detect laser beam has arrived target track.When the luminous point of laser beam arrives target track, the lock rail signal of position command generation unit and lock rail detecting unit 111 output noble potentials, make switch unit 113 switch to the output terminal of track error signal, then the track servo loop switches to tracking rail mode (track following mode), and the luminous point of laser beam will can be positioned on the target track.
107 of hybrid orbital position detecting units are to utilize two conversion of signals of track error signal TES and focusing summation signals SUM to go out orbital position.Because the orbital position that detected of hybrid orbital position detecting unit 107 is at single track, when jumping onto the tracks in the multiple road, generation one orbital position that adds up just can add up in the unit 108 that must the collocation position adds up.Hybrid orbital position detecting unit 107 is exported a position signalling HTP and a regional switching signal AREA simultaneously.Position signalling HTP is the orbital position of current track, and regional switching signal AREA is corresponding zone conversion.Utilize regional switching signal AREA, the unit 108 that adds up, position can judge whether to stride the generation of rail, when the luminous point of laser beam is striden rail, then increase the add up counter of 108 inside, unit of position, to add up current track position and export the track position signal POS that adds up
HTP, to subtrator 112.
The output of the unit 108 track position signal POS that adds up adds up in the position
HTPThe target position signal POS that is exported with position command generation unit and lock rail detecting unit 111
CMDNeeded position error signal POS in the time of will together exporting subtrator 112 to and jump onto the tracks with generation
ERR
109 of compensating units are the output according to switch unit 113, export the control signal TRO that this position control unit produces, the voltage transitions of the control signal TRO that driver element 105 is produced compensating unit 109 becomes electric current to export actuating unit 103 to optical read head 102 is moved.The laser beam that optical read head 102 is produced will be radiated on the optical record medium 101, and the reflection of luminous point will export prime amplifier 104 to after will being received by the light signal detector on the read head 102 (photo detector).Prime amplifier 104 produces track error signal TES and focuses on summation signals SUM then.Focus on summation signals SUM and will be sent to hybrid orbital position detecting unit 107, track error signal TES then can be sent to hybrid orbital position detecting unit 107 and switch unit 113.
When position control unit 106 switched to jumping out of rail mode after receiving the order of jumping onto the tracks that microprocessor unit 110 produces, control signal TRO was in order to the add up output POS of unit 108 of contracted position
HTPOutput POS with position command generation unit and lock rail detecting unit
CMDBetween difference so that laser beam spots is moved to target track by current track.
Position control unit 106 in Fig. 1 and wherein each component units can realize by digital signal processor fully that for example sampling frequency is the digital signal processor of 100kHz, without any need for other external circuit.
Fig. 2 is the composition synoptic diagram of disclosed hybrid orbital position detecting unit 107, and hybrid orbital position detecting unit 107 has comprised the first offset compensation unit 201, the second offset compensation unit 202, the first peak value detecting unit 203, the first side-play amount detecting unit 204, the second peak sensing unit 205, the second side-play amount detecting unit 206, first gain compensation unit 207, second gain compensation unit 208, the first gain calculating unit 209, the second gain calculating unit 210, hybrid orbital position computing unit 211, an and supplemental characteristic file 212.Wherein, the first offset compensation unit 201, the second offset compensation unit 202, the first peak value detecting unit 203, the first side-play amount detecting unit 204, first gain compensation unit 207 are relevant with track error signal TES with the first gain calculating unit 209, and the second offset compensation unit 202, the second peak sensing unit 205, the second side-play amount detecting unit 206, second gain compensation unit 208 and the second gain calculating unit 210 are with to focus on summation signals SUM relevant.
After the focus servo loop of system starts, track error signal TES and focusing summation signals SUM can have the waveform generation of sine wave, sawtooth wave or near sinusoidal ripple because striding the influence of rail, and this moment, the first peak value detecting unit 203 and the second peak sensing unit 205 can remove to detect the maximal value (TES of track error signal TES and focusing summation signals SUM
MAX, SUM
MAX) and minimum value (TES
MIN, SUM
MIN), the first side-play amount detecting unit 204 and 206 of the second side-play amount detecting units can go to detect track error signal TES and the side-play amount that focuses on summation signals SUM, and the first side-play amount detecting unit 204 and the second side-play amount detecting unit 206 can be exported one first side-play amount TES respectively according to this
OFFSETWith one second side-play amount SUM
SFFSETTo the first offset compensation unit 201 and the second offset compensation unit 202, to eliminate track error signal TES and the side-play amount that focuses on summation signals SUM.The first offset compensation unit 201 will be according to the track error signal TES and the first side-play amount TES then
OFFSETExport a signal and deliver to first gain compensation unit 207.202 of the second offset compensation unit are according to focusing on the summation signals SUM and the second side-play amount SUM
OFFSETExporting a signal delivers to and second gain compensation unit 208.
Maximal value and minimum value TES that the first gain calculating unit 209 and the second gain calculating unit 210 are produced according to the first cutting edge of a knife or a sword value detecting unit 203 and the second cutting edge of a knife or a sword value detecting unit 205 respectively
MAX, TES
MIN, SUM
MAX, and SUM
MIN, and the first side-play amount TES that produced of the first offset compensation unit 204 and the second offset compensation unit 206
OFFSETWith the second side-play amount SUM
OFFSETTo calculate track error signal TES and to focus on summation signals SUM standardization (normalization) needed yield value (being respectively first yield value and second yield value), export first gain compensation unit 207 and second gain compensation unit 208 then to.Then first gain compensation unit 207 and 208 of second gain compensation unit can produce standardization track error signal TES
NORM(normalized tracking error) and standardization summation focus signal SUM
NORM(normalized focus sum) to hybrid orbital position computing unit 211, hybrid orbital position computing unit 211 is output area switching signal AREA and orbital position HTP again.Supplemental characteristic file 212 has then write down orbital position computing unit 211 more needed parameters, is respectively Level1P, Level1N, Level2, Level3, HTP1, HTP2, HTP3 and HTP4.211 of hybrid orbital position computing units can produce the needed orbital position of track jump apparatus.
Fig. 3 is the principle of disclosed hybrid orbital position detecting unit, standardization track error signal TES
NORM, standardization focuses on summation signals SUM
NORMAnd the relation between the orbital position, and the relation of pairing transition region, wherein (a) part is the standardization track error signal, (b) part focuses on summation signals for standardization, (c) part is an orbital position, and (d) part is corresponding transition region, is respectively AREA 1 to AREA 8.
From Fig. 3, can obtain the zone of linear relationship.In AREA1, AREA4, AREA5 and AREA8, standardization track error signal TES
NORMWith the relation of orbital position be comparison near linear, and in AREA2, AREA3, AREA6 and AREA 7, then be that standardization focuses on summation signals SUM
NORMWith the relation of orbital position be that comparison is near linear.Therefore, just the present invention designs hybrid orbital position computing unit 211 according to this this linearizing corresponding relation, and realizes hybrid orbital position computing unit 211 with digital processing unit, its computing method are shown in Fig. 4 A～Fig. 4 B.
The orbital position of setting " on track " is 0, the orbital position of " off track " point be HTP4 or-HTP4, then can design the calculation process of the orbital position of Fig. 4 A～Fig. 4 B according to regional transformational relation of (d) part among Fig. 3.After obtaining the standardization track error signal and standardizing the focusing summation signals, the relation that can focus on summation signals and default Level1P, Level1N according to standardizing is done the zone of phase one and is changed judgement.
Phase one is to judge that standardization focuses on summation signals SUM
NORMThe zone at place promptly judges whether to be arranged in the range of linearity of AREA2, AREA3, AREA6 and AREA 7, is to carry out in step 401 to step 403.Details are as follows.
At first, judge that standardization focuses on summation signals SUM
NORMWhether 0 and positive Level1P between.In step 401, if standardization focuses on summation signals SUM
NORM0 and positive Level1P between, if yes, then may be positioned at AREA3 or AREA6.Otherwise enter step 402.
Judge that then standardization focuses on summation signals SUM
NORMWhether 0 and negative Level1N between.In step 402, if standardization focuses on summation signals SUM
NORM0 and negative Level1N between, if yes, then may be positioned at AREA2 or AREA7, otherwise enter step 403.
Judge that then standardization focuses on summation signals SUM
NORMWhether greater than positive Level1P.In step 403, if standardization focuses on summation signals SUM
NORMGreater than positive Level1P, then enter step 406, then may be positioned at AREA4 or AREA5; Otherwise the representative standardization focuses on summation signals SUM
NORMLevel1N less than negative then may be positioned at AREA1 or AREA8, then enters step 407.So far, performance specification focusing summation signals SUM
NORMThe judgement of region.
After the judgement of the zone conversion of finishing the phase one, can be according to standardization track error signal TES
NORMDo the judgement of the zone conversion of subordinate phase.Be to judge standardization track error signal TES in subordinate phase
NORMWhether be just to determine the zone at place.
In step 404, if standardization track error signal TES
NORMMore than or equal to 0, then enter step 408, the zone is converted to AREA3, according to the formula of step 408: HTP=HTP2-(SUM
NORM/ Level1P) * (HTP2-HTP1) calculate orbital position, otherwise enter step 409, the zone is converted to AREA6, can be according to the formula of step 409: HTP=-HTP2+ (SUM
NORM/ Level1P) * (HTP2-HTP1) calculate orbital position.
In step 405, if standardization track error signal TES
NORMMore than or equal to 0, then enter step 410, the zone is converted to AREA 2, can be according to the formula of step 410: HTP=HTP2-(SUM
NORM/ Level1N) * (HTP3-HTP2) calculate orbital position, otherwise enter step 411, the zone is converted to AREA 7, can calculate according to the formula of step 411: HTP=-HTP2+ (SUM
NORM/ Level1N) * (HTP3-HTP2) orbital position.
In step 406, if standardization track error signal TES
NORMMore than or equal to 0, then enter step 412, the zone is converted to AREA 4, can be according to the formula of step 412: HTP=(TES
NORM/ Level2) * (HTP1) calculate orbital position, otherwise enter step 413, the zone is converted to AREA 5, can be according to the formula of step 413: HTP=(TES
NORM/ Level2) * (HTP1) calculate orbital position.
In step 407, if standardization track error signal TES
NORMMore than or equal to 0, then enter step 414, the zone is converted to AREA 1, can be according to the formula of step 414: HTP=HTP4-(TES
NORM/ Level3) * (HTP4-HTP3) calculate orbital position, otherwise enter step 415, the zone is converted to AREA 8, can be according to the formula of step 415: HTP=-HTP4-(TES
NORM/ Level3) * (HTP4-HTP3) calculate orbital position.
The above is disclosed operation principles of the present invention and composition, below with the actual enforcement of three groups of experimental datas explanation disclosed track jump apparatus of the present invention situations.
First experimental example
Fig. 5 is first experimental example of the present invention, and the rail number of jumping onto the tracks is 8 rails, adopts uniform velocity control in the whole process of jumping onto the tracks, and the rail speed of striding of target is 2kHz.The purpose of this experiment is whether the orbital position that test mixing formula orbital position detecting unit 107 is produced has serious distortion.Wherein, the oscillogram of A part is the output of compensating unit 109, and the oscillogram of B part is for focusing on summation signals, and the oscillogram of C part is a track error signal, and the oscillogram of D part is an orbital position.
As shown in Figure 5, stride rail speed and be controlled at 2kHz exactly, lock produced during rail to surmount (overshoot) very little, can be positioned on the target track exactly.And the orbital position distortion that is produced is very little.Can control exactly and stride rail speed and orbital position when jumping onto the tracks, especially when the lock rail, stride rail speed and can be controlled at exactly in the controlled frequency scope of track servo loop, and be unlikely to have influence on the stability of track servo loop, laser beam spots can be positioned on the target track exactly.
Second experimental example
Second experimental example is that 255 continuous five times rails are jumped onto the tracks, and the test disc that is adopted is ABEXTDR-813, is the DVD-ROM disc of offset 150 μ m.This experiment can be tested this track jump apparatus and eliminate the effect of external disturbance, for example the change of the eccentric characteristic of disc and optical read head driving mechanism friction force state etc.The test condition that this experiment is adopted as shown in Figure 6, (period) constituted by three phases, is respectively boost phase (acceleration period), constant speed stage (constant velocityperiod) and decelerating phase (deceleration period).(c) part is the accekeration of three test phases, the longitudinal axis is accekeration (acceleration), transverse axis is time (time), and wherein the accekeration in the accekeration of boost phase and decelerating phase can be adjusted according to the characteristic of rail number and track actuator.(b) part is the velocity amplitude that accekeration produced according to (c) part, and the longitudinal axis is velocity amplitude (velocity), and transverse axis is time (time).Because position control unit 106 is to utilize digital signal processor to realize, and sampling frequency has only 100kHz, therefore will limit the frequency range of mixing type orbital position detecting unit 107, can stablize the highest rail speed of striding that detects at present is 35tracks/mesc, and therefore the speed of (b) part must satisfy this restriction.(a) position of part for being produced according to (b) part, the longitudinal axis is position (positoin), transverse axis is time (time).
Fig. 7 is the result of experiment two, wherein the position output of jumping onto the tracks of (a) part for these 5 times 255 rails repeatedly with, (b) the part speed output of jumping onto the tracks for these 5 times 255 rails repeatedly and, (c) the part lock rail situation of jumping onto the tracks for these 5 times 255 rails change with, statistics is shown in the form in the icon.Wherein maximum is jumped onto the tracks the time (Max track jump time) for 10.5637msec, minimum is jumped onto the tracks the time (Min track jumptime) for 10.5581msec, on average jump onto the tracks the time (Avg.track jump time) for 10.5604msec, maximum cutting edge of a knife or a sword value is striden rail speed (Max peak track crossing velocity) and is 31.5059tracks/msec, it is 31.3100 tracks/msec that minimum cutting edge of a knife or a sword value is striden rail speed (Min peak track crossing velocity), it is 2.0493 tracks/msec that maximum final value is striden rail speed (Max final track crossingvelocity), and it is 1.9279 tracks/msec that minimum final value is striden rail speed (Min final trackcrossing velocity).
As shown in Figure 7, even externally under the influence of Gan Raoing, this disclosed track jump apparatus still can obtain very stable jumping onto the tracks, lock rail situation is produced, and to surmount (overshoot) very little, can stably be positioned on the target track, and the reappearance of at every turn jumping onto the tracks is all very good.
The 3rd experimental example
The 3rd experimental example is that 7 continuous five times rails are jumped onto the tracks, and the test disc that is adopted is ABEX TDR-813, is the DVD-ROM disc of offset 150 μ m.This experiment can be tested this track jump apparatus and eliminate external disturbance, for example eccentric characteristic of disc.
The test condition that the 3rd experimental example is adopted as shown in Figure 8.Because the rail number of jumping onto the tracks is less, can not surpass the frequency range restriction of hybrid orbital position detecting unit 107, therefore constituted by two stages, be boost phase and decelerating phase.In Fig. 8, (c) part is the accekeration of three test phases, the longitudinal axis is accekeration (acceleration), and transverse axis is time (time), and wherein the accekeration in the accekeration of boost phase and decelerating phase can be adjusted according to the characteristic of rail number and track actuator.(b) part is the velocity amplitude that accekeration produced according to (c) part, and the longitudinal axis is velocity amplitude (velocity), and transverse axis is time (time).Because position control unit 106 is to utilize digital signal processor to realize, and sampling frequency has only 100kHz, therefore will limit the frequency range of orbital position detecting unit 107, can stablize the highest rail speed of striding that detects at present is 35 tracks/mesc, and therefore the speed of (b) part must satisfy this restriction.(a) position of part for being produced according to (b) part, the longitudinal axis is position (positoin), transverse axis is time (time).
Fig. 9 is the result of experiment three, wherein, (a) the part position output of jumping onto the tracks for these 5 times 7 rails repeatedly and, (b) the part speed output of jumping onto the tracks for these 5 times 7 rails change with, (c) the part lock rail situation of jumping onto the tracks for these 5 times 7 rails repeatedly with, shown in the form in the statistics icon.Wherein, maximum is jumped onto the tracks the time (Maxtrack jump time) for 1.2751msec, minimum is jumped onto the tracks the time (Min track jump time) for 1.2670msec, on average jump onto the tracks the time (Avg.track jump time) for 1.2701msec, maximum cutting edge of a knife or a sword value is striden rail speed (Max peak track crossing velocity) and is 8.5188tracks/msec, it is 8.2937 tracks/msec that minimum cutting edge of a knife or a sword value is striden rail speed (Min peak track crossing velocity), maximum final value is striden rail speed (Max final track crossingvelocity) and is 2.2246tracks/msec, and minimum final value is striden rail speed (Min final trackcrossing velocity) and is 2.1024tracks/msec.
As shown in Figure 9, even externally disturb, disclosed track jump apparatus still can obtain very stable jumping onto the tracks, and lock rail situation is produced, and to surmount (overshoot) all very little, can stably be positioned on the target track, and the reappearance of at every turn jumping onto the tracks is all very good.
Can learn that from above explanation and experimental data disclosed track jump apparatus does not need to describe in the mode of building table the relation of track error signal, focusing summation signals and orbital position.Parameters needed has only Level1P, Level1N, Level2, Level3, HTP1, HTP2, HTP3, HTP4 etc.Because the regulation of DVD disc is comparatively rigorous, the mobility scale of DVD disc gauge is very little, adds that track error signal and focusing summation signals injection position detecting unit again 109 afterwards all can be by standardization normalized, even therefore after changing the DVD disc, Level1P, Level1N, Level2, Level3, HTP1, HTP2, HTP3, parameters such as HTP4 can not need change.
Though the present invention discloses as above with aforesaid preferred embodiment; right its is not in order to limit the present invention; any those of ordinary skills; without departing from the spirit and scope of the present invention; can realize corresponding change and revise retouching, therefore scope of patent protection of the present invention is as the criterion with the claimed scope of claims of the present invention.
Claims (12)
1, a kind of track jump apparatus that reads optical record medium, be used for to when reading the optical record medium data-track stride rail speed and orbital position is controlled, it is characterized in that, include:
One actuating unit is in order to drive an optical read head corresponds to this data-track with generation on the data-track of this optical record medium with projecting laser Shu Guangdian information;
One prime amplifier produces a track error signal and according to this information that corresponds to this data-track and focuses on summation signals;
One microprocessor unit is in order to provide the order of jumping onto the tracks; And
One position control unit, when this position control unit does not receive this when jumping onto the tracks order, this optical read head will be positioned on the current track, and receives this track error signal and control the position of this actuating unit to produce a control signal; When this position control unit receives this when jumping onto the tracks order, this optical read head will be moved on the target track by current track, and receive this track error signal and this focusing summation signals and stride rail speed and orbital position with what produce that a control signal controls this actuating unit;
Wherein, this position control unit includes:
One hybrid orbital position detecting unit is exported a track position signal and a regional switching signal according to this track error signal and this focusing summation signals;
The track position signal that adds up according to this track position signal and should the zone switching signal calculate the orbital position that adds up at present, and is exported in the unit that adds up, one position;
One position command generation unit and lock rail detecting unit produce a target location command signal and a lock rail signal in order to the order of jumping onto the tracks according to this, and this laser beam spots is moved to target track by current track;
One subtrator is exported a position error signal according to this add up track position signal and this target location command signal; And
One switches the unit, according to accurate of this lock rail voltage of signals to receive this track error signal or to receive this position error signal.
2, the track jump apparatus that reads optical record medium as claimed in claim 1 is characterized in that, this actuating unit is by Current Control.
3, the track jump apparatus that reads optical record medium as claimed in claim 2, it is characterized in that, this track jump apparatus that reads optical record medium more includes a driver element, in order to convert this control signal to current forms output by voltage form, to control this actuating unit.
4, the track jump apparatus that reads optical record medium as claimed in claim 1 is characterized in that, more includes a compensating unit, in order to export this control signal that this position control unit produces.
5, the track jump apparatus that reads optical record medium as claimed in claim 1 is characterized in that, this hybrid orbital position detecting unit includes:
One supplemental characteristic file is in order to store the correlation parameter that calculates orbital position; And
One hybrid orbital position computing unit is exported this track position signal and this zone switching signal according to a standardization track error signal and a standardization focusing summation signals.
6, the track jump apparatus that reads optical record medium as claimed in claim 5 is characterized in that, this hybrid orbital position detecting unit more includes:
One first gain calculating unit according to the side-play amount of a track error signal and the maximal value and the minimum value of a track error signal, calculates the needed yield value of this track error signal of standardization;
One second gain calculating unit focuses on the side-play amount of summation signals and the maximal value and the minimum value of a focusing summation signals, the needed yield value of this focusing summation signals of calculating standardization according to one;
One first gain compensation unit is exported this standardization track error signal according to the yield value of this track error signal and the offset compensation of this track error signal; And
One second gain compensation unit is exported this standardization focusing summation signals according to the yield value of this focusing summation signals and the offset compensation of this focusing summation signals.
7, the track jump apparatus that reads optical record medium as claimed in claim 6 is characterized in that, this hybrid orbital position detecting unit more includes:
One first peak value detecting unit is in order to maximal value and the minimum value of detecting this track error signal;
One second peak sensing unit is in order to maximal value and the minimum value of detecting this focusing summation signals;
One first side-play amount detecting unit is in order to export this track error signal side-play amount according to this track error signal; And
One second side-play amount detecting unit is in order to export the side-play amount of this focusing summation signals according to this focusing summation signals.
8, the track jump apparatus that reads optical record medium as claimed in claim 6 is characterized in that, this hybrid orbital position detecting unit more includes:
One first offset compensation unit is in order to export the offset compensation of this track error signal according to this track error signal side-play amount; And
One second offset compensation unit is in order to export the offset compensation of this focusing summation signals according to the side-play amount of this focusing summation signals.
9, the track jump apparatus that reads optical record medium as claimed in claim 5 is characterized in that, exports this zone switching signal when summation signals is a linear relationship when this standardization track error signal and this standardization focus on.
10, a kind of position detection method that reads the track jump apparatus of optical record medium, be used for to when reading the data-track of optical record medium stride rail speed and orbital position is controlled, this device has an optical read head corresponds to this data-track with generation on the data-track of this optical record medium with projecting laser Shu Guangdian information at least, it is characterized in that, include the following step:
Export a track error signal and by a prime amplifier according to the information of this data-track and focus on summation signals, focus on summation signals by an orbital position detecting unit according to this track error signal and again and export a track position signal and a regional switching signal;
Provide the order of jumping onto the tracks by a microprocessing unit, and export a target position signal and a lock rail signal according to this order of jumping onto the tracks;
According to this track position signal and should the zone switching signal output one track position signal that adds up;
Export a position error signal according to this add up track position signal and this target position signal; And
According to this lock rail voltage of signals current potential, export a control signal to control the rail speed of striding of this optical read head by a compensating unit.
11, the position detection method of track jump apparatus as claimed in claim 10 is characterized in that, is exporting in the step of a track position signal and a regional switching signal according to a track error signal and a focusing summation signals, more includes the following step:
Obtain a side-play amount, a maximal value and a minimum value according to this track error signal;
Obtain a side-play amount, a maximal value and a minimum value according to this focusing summation signals;
Side-play amount, this maximal value, this minimum value according to this track error signal are exported a yield value;
Side-play amount, this maximal value, this minimum value according to this focusing summation signals are exported a yield value;
According to the yield value of this track error signal and the side-play amount output one standardization track error signal of this track error signal; And
Export a standardization focusing summation signals according to this yield value and this side-play amount that focuses on summation signals that focuses on summation signals.
12, the position detection method of track jump apparatus as claimed in claim 11 is characterized in that, exports this zone switching signal when summation signals is a linear relationship when this standardization track error signal and this standardization focus on.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03130891 CN1275238C (en) | 2003-05-21 | 2003-05-21 | Reading optical recording media trace hopping apparatus and its position detecting method |
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| CN 03130891 CN1275238C (en) | 2003-05-21 | 2003-05-21 | Reading optical recording media trace hopping apparatus and its position detecting method |
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| CN1275238C true CN1275238C (en) | 2006-09-13 |
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| CN100390876C (en) * | 2005-06-30 | 2008-05-28 | 广明光电股份有限公司 | CDROM track-hopping controlling method |
| CN101118757B (en) * | 2006-08-02 | 2011-05-04 | 鸿富锦精密工业（深圳）有限公司 | Optical disk player and rail changing method |
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