CN1860533A - Disc drive apparatus - Google Patents

Disc drive apparatus Download PDF

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Publication number
CN1860533A
CN1860533A CNA2004800285918A CN200480028591A CN1860533A CN 1860533 A CN1860533 A CN 1860533A CN A2004800285918 A CNA2004800285918 A CN A2004800285918A CN 200480028591 A CN200480028591 A CN 200480028591A CN 1860533 A CN1860533 A CN 1860533A
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CN
China
Prior art keywords
signal
ren
mirn
read
control circuit
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Pending
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CNA2004800285918A
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Chinese (zh)
Inventor
M·F·赫特杰斯
F·L·M·克利默斯
F·B·斯帕林
G·A·L·利恩克奈特
H·朗夫
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Koninklijke Philips NV
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Koninklijke Philips Electronics NV
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Publication of CN1860533A publication Critical patent/CN1860533A/en
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0948—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following specially adapted for detection and avoidance or compensation of imperfections on the carrier, e.g. dust, scratches, dropouts
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/18—Error detection or correction; Testing, e.g. of drop-outs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0941—Methods and circuits for servo gain or phase compensation during operation
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0946—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following specially adapted for operation during external perturbations not related to the carrier or servo beam, e.g. vibration

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)

Abstract

A method is described for controlling an optical disc drive apparatus (1) of a type comprising: scanning means (30) for scanning a record track of an optical disc (2) and for generating a read signal (SR); actuator means (50) for controlling the positioning of at least one read/write element (34) of said scanning means (30) with respect to the disc (2); a control circuit (90) for receiving said read signal (SR) and generating at least one actuator control signal (SCR) on the basis of at least one signal component of said read signal (SR), the control circuit (90) having at least one variable control parameter. The method comprises the steps of: deriving from said read signal (SR) at least two signals (REn; MIRn) of mutually different type; and varying the setting of said at least one variable control parameter as a function of said at least two signals. An other method is described for discriminating two kinds of disturbances originated by a) disc defects, b) schocks.

Description

Disc driving equipment
Technical field
The present invention relates generally to be used for information is write optical memory disc/from the disc drive unit of optical memory disc sense information.
Background technology
As is known, optical memory disc comprises at least one track of the linear formula of the continuous helical of storage space or a plurality of concentric circles forms, wherein can be by the form canned data of data pattern.CD can be read-only type, recorded information during manufacture wherein, and this information only can be read by the user.Optical memory disc can also be write type, wherein can be by user storage information.For information being write in the storage space of optical memory disc, perhaps for sense information from dish, CD drive comprises on the one hand and is used to receive and the whirligig of rotary CD; And comprise electro-optical device on the other hand, be used to generate the light beam that is generally laser beam, and utilize described laser beam flying storage track.Since can be in CD canned data mode and can be normally known from the optical disc of the mode of optical disk reading bright dipping data, so do not need more specifically to describe this technology here.
For rotary CD, CD drive generally includes motor, the wheel hub (hub) of the core of this motor driven engagement CD.Usually, motor is implemented as Spindle Motor (spindlemotor), and the wheel hub of motor driven can be directly installed on the main shaft of motor.
For the photoscanning rotating disc, CD drive comprises: light beam generator device (normally laser diode); Be used for focusing the beam at the object lens of the focal spot on the dish; And photodetector, be used to receive from coiling the reflected light that reflects and being used to generate the photodetector output signal.Photodetector comprises a plurality of detector-segments (segment), and each section provides independent section output signal.
During operation, light beam should remain focused on the dish.For this reason, object lens are arranged to axially movable (displaceable), and CD drive comprises the actuator means of the axial location that is used for controlling object lens.In addition, focal spot should keep aiming at track or should positioning with respect to new track.For this reason, object lens are installed into radially movablely at least, and CD drive comprises the radial actuator means of the radial position that is used to control object lens.
In many disk drives, object lens are tiltably arranged, and this CD drive comprises the tilt-activated apparatus at the inclination angle that is used to control object lens.
In order to control these actuators, CD drive comprises the controller that receives output signal from photodetector.From this signal (the following read signal that also is referred to as), controller is derived one or more error signals, such as focus error signal, radial error signal, and according to these error signals, controller generates actuator control signal, is used to control actuator to reduce or the elimination site error.
In the processing that generates actuator control signal, controller shows some controlling features.Such controlling features is the characteristic of controller, and it can be described to controller and show as mode to the reaction that detects site error.
In fact site error may be caused by dissimilar disturbances.Two most important classifications of disturbance are:
1) disc defect
2) exterior vibration and (periodically) vibration.
First the classification comprises: be similar to stain the inner disk defective, be similar to fingerprint pollution, be similar to the damage of cut etc.Second classification comprises the vibrations that cause owing to the object that collides disk drive, but vibrations and vibration mainly are expected in portable disc driver and the automobile application.Except the difference that originates from, disc defect on the one hand is the frequency range of signal disturbance with important difference between vibrations on the other hand and the vibration: because the signal disturbance that disc defect causes high-frequency normally, and shake and vibrate normally low frequency.
The problem of this aspect is suitably to handle the controlling features that first disturbance of classifying need be different from the suitable processing second classification disturbance.Usually, the controller of disk drive has fixing controlling features, the disturbance that this controlling features or be particularly suitable for is suitably handled first classification (in this case, error control is not best in the second classification disturbance situation) or be particularly suitable for suitably handling second disturbance of classifying (in this case, error control is not best in the situation of the first classification disturbance), perhaps this controlling features is compromise (in this case, error control is not best in the situation of the first classification disturbance and in the situation of the second classification disturbance).As long as controller is used the Linear Control technology, always exist the low-frequency excitation refusal with to trading off between the high frequency susceptibility of measuring noise.
In the art, advised gain according to the type change controller of the disturbance of being experienced.For example, referring to U.S. Pat 4722079.
In order to realize having the controller of variable gain, must determine any class disturbance at hand.Described US patent 4722079 has disclosed wherein handles the system of light read signal with definite disturbance type, but this system needs 3 beam optical system.
US patent 5867461 has also disclosed a kind of light read signal of handling to determine the system of disturbance type.In this known system, determine the envelope of high frequency signal contents.A shortcoming of this method is: the data that it depends on the dish to be write; It not can be applicable to blank disc.Another shortcoming is: this method needs complicated circuit, especially need to be used for detecting upward peak and following peak value circuit, be used to filter circuit, be used to analyze the circuit of these envelopes and be used for the circuit of signal storage at storer with detection coenvelope and lower envelope.
General considerations relates to the controlling features that adapts in the disk drive, and it should processing machine vibrations and disc defect.Change controlling features so that handle one type disturbance better, this may seriously influence the ability of the controller of handling another type disturbance.
In addition, the inventor has been found that: single detection signal always is not used to distinguish the reliable source of the information of mechanical shock and disc defect.In other words, certain signal can generate in the situation of mechanical shock and in the situation of disc defect, so incident may be defined as disc defect or mechanical shock mistakenly.
General objects of the present invention provides and a kind ofly is used for more reliably determining that incident is corresponding to the appearance of mechanical shock or corresponding to the method for the appearance of disc defect.
In addition, another object of the present invention provides a kind of method that is used for determining disturbance type, and this method can relatively easily be implemented.
In addition, an object of the present invention is to provide a kind of method that is used for changing the controlling features of controller according to above-mentioned definite result.
Summary of the invention
According to first importance of the present invention, the method that is used for distinguishing the dissimilar disturbances of disc driving equipment is based on receiving and handling at least two types signal, and wherein each type signal is derived from detector signal.The signal of the first kind is based on the signal of two or more single section output signal sums; The summation (possibly, weighted sum) of the single section output signal by generating all detector-segments generates the preferred signals of the first kind.The signal of this Class1 is the measurement (that is, " dish quality ") of the reflectivity of dish, and will be responsive for disc defect mainly.
The signal of second type is based on the signal of two or more single section output signal sums, and wherein at least one signal times in these signals is with-1.The signal of this type 2 is with the only appearance of indicating positions error.
The signal of the first kind can provide certain response of display disc defective or vibrations; Equally, the signal of second type can be given in certain response in disc defect or the shock conditions.According to second importance of the present invention, if the signal of first and second types is consistent each other, just determine disc defect or vibrations, therefore reduced the chance of false judgment.
Note,, can distinguish vibrations in the vertical direction (that is, being parallel to the rotating shaft of spiraling) and the vibrations in the horizontal direction (that is, perpendicular to the rotating shaft of spiraling) by considering focus error signal and radial error signal respectively.
Description of drawings
Utilization will further be explained these and other aspect of the present invention, feature and advantage below in conjunction with the description of the drawings, and wherein identical label is indicated same or similar part, and wherein:
Figure 1A has schematically illustrated the relevant components parts of disc drive unit;
Figure 1B has schematically illustrated the embodiment of photodetector in more detail;
Fig. 2 is the block scheme that schematically illustrates the actuator control circuit;
Fig. 3 is the chart that schematically illustrates the function that is used to change the actuator control circuit;
Fig. 4 is the sequential chart that is used to illustrate the signal of operation of the present invention.
Embodiment
Figure 1A has schematically shown disc drive unit 1, is suitable for information stores on the CD 2 of normally DVD or CD, or is suitable for sense information from CD 2.For rotating disc 2, disc driving equipment 1 comprises the motor 4 that is fixed on the framework (frame) (not shown for simplification), and described framework limits turning axle 5.
Disc driving equipment 1 also comprises light () system 30, is used to utilize the track (not shown) of beam flying dish 2.More particularly, in the exemplary arrangement shown in Figure 1A, photosystem 30 comprises light beam generating apparatus 31, and normally laser instrument such as laser diode, is arranged to generate light beam 32.Below, the different piece of 39 light beam 32 appends to character a, b, c on the label 32 with utilization and waits and indicate along light (road) footpath.
Light beam 32 arrives (light beam 32b) dish 2 by optical splitter 33, collimation (instrument) lens 37 and object lens 34.Object lens 34 are designed to light beam 32b is focused among the focal spot F on the recording layer (for the sake of simplicity and not shown) of dish.Light beam 32b reflects (beam reflected 32c) from coiling 2, and by object lens 34, collimation lens 37 and optical splitter 33, arrives (light beam 32d) photodetector 35.Shown in situation in, optical element 38 such as prism is inserted between beam splitter 33 and the photodetector 35.
Disc driving equipment 1 also comprises actuator system 50, and it comprises and is used to make the radial actuator 51 of object lens 34 with respect to dish 2 radial displacements.Because radial actuator itself is known, and the present invention does not relate to the Design and Features of this radial actuator, therefore do not need more to go through the Design and Features of radial actuator here.
In order to realize and to keep correct focusing, accurately focus on the desired location of dish 2, described object lens 34 are installed into axially movable, and actuator system 50 also comprises focus actuator 52 simultaneously, and it is arranged to make object lens 34 with respect to dish 2 axial displacements.Because focus actuator itself is known, and the design of this focus actuator and operation are not themes of the present invention, therefore do not need very at length to discuss the design and the operation of this focus actuator here.
In order to realize and keep the correct obliquity of object lens 34, object lens 34 can be installed on pivot rotationally; In this case, as directed, actuator system 50 also comprises tilt actuators 53, is arranged to rotate object lens 34 with respect to dish 2 pivots.Because tilt actuators itself is known, and the design of this tilt actuators and operation are not themes of the present invention, therefore do not need very at length to discuss the design and the operation of this tilt actuators here.
Also note, be used for respect to equipment frame support object lens device, be used for axially and the device of radial displacement object lens and being used to rotate the device of object lens itself is normally known.Because the design of this support and gearshift and operation are not themes of the present invention, therefore do not need to go through very much its design and operation here.
Notice that also radial actuator 51, focus actuator 52 and tilt actuators 53 may be implemented as an integrated actuator.
Disc driving equipment 1 also comprises control circuit 90, it has the control input that first output 92 is connected to motor 4, have second output 93 and be coupled to the control input of radial actuator 51, have the 3rd output 94 and be coupled to the control input of focus actuator 52, and have the control input that tilt actuators 53 is coupled in the 4th output 95.Control circuit 90 is designed to generate the control signal S that is used to control motor 4 in its first output 92 CM, in its second output 93, generate the control signal S be used to control radial actuator 51 CR, in its 3rd output 94, generate the control signal S be used to control focus actuator 52 CFAnd in its 4th output 95, generate the control signal S that is used to control tilt actuators 53 CT
Control circuit 90 also has and is used for receiving read signal S from photodetector 35 RRead signal input 91.
Figure 1B shows photodetector 35 can comprise a plurality of detector-segments.In the situation shown in Figure 1B, photodetector 35 comprises can provide independent detector signal A, B, C, D, S1,6 detector-segments 35a, the 35b of S2,35c, 35d, 35e, 35f respectively, indicates the light quantity on each that incides 6 detector-segments respectively.4 detector-segments 35a, 35b, 35c and 35d also being represented as the central aperture detector-segments are arranged in the four-quadrant configuration.The center line 36 that first and the 4th section 35a and 35d and second and the 3rd section 35b and 35c are separated has and the corresponding direction of trajectory direction.Two detector-segments 35e, 35f that also are represented as the satellite detector-segments and itself can be subdivided into son section are arranged in the next door of central detector quadrant symmetrically, and on the opposite side of described center line 36.Because 6 sections such detecting devices itself are known, therefore do not need to provide being described in more detail of its Design and Features here.
Notice that the different designs that is used for photodetector 35 also is possible.For example, can omit satellite segments, because itself be known.
In fact the read signal input 91 that Figure 1B goes back display control circuit 90 comprises a plurality of inputs that are used for receiving all single detector signals.Thereby, shown in the situation of 6 quad detectors under, in fact the read signal input 91 of control circuit 90 comprises 6 inputs 91a, 91b, 91c, 91d, 91e, 91f, is used for receiving respectively described single detector signal A, B, C, D, S1, S2.As being clearly for those skilled in the art, control circuit 90 is designed to handle described single detector signal A, B, C, D, S1, S2, with derived data signal and one or more error signal.Radial distance between radial error signal (being designated hereinafter simply as RE) indication track and the focal spot F.Axial distance between focus error signal (being designated hereinafter simply as FE) indication accumulation layer and the focal spot F.Note, according to the design of photodetector, different formulas that can the use error calculated signals.In general, each all is the measurement of certain asymmetry of central optical on the detecting device 35 (spot) point for such error signal, and is responsive for photoscanning point with respect to the displacement of coiling therefore.
By the distinctive signal of handling described single detector signal and can deriving is mirror image (mirror) the signal MIRn that utilizes the weighted sum of all single detector signal A according to formula (1), B, C, D, S1, S2 to obtain:
MIRn＝A+B+C+D+W(S1+S2) (1)
Wherein W represents weighting factor, and magnitude is about 15 usually.This signal is the measurement of dish reflectivity.
On the contrary, common error signal such as REn derived by addition single detector signal A suitably, B, C, D, S1, S2 some (or all), in these signals at least one (but not all) is reversed (promptly, be multiplied by-1), as skilled in the art will understand.For example, can define radial error signal REn according to formula (2):
REn = ( A + D ) - ( B + C ) - W ( S 1 - S 2 ) A + B + C + D + S 1 + S 2 · · · ( 2 )
W is a weighting factor.
Control circuit 90 is designed to generate the function of its control signal as error signal, to reduce corresponding error, as skilled in the art will understand.In the case, control circuit 90 has the variable controlling features that depends on error pattern.Since disc defect cause under the situation of error, according to the controlling features of first strategy modification (adapt) control circuit 90, so that handle disc defects suitably.Causing under the situation of error owing to exterior vibration, according to the controlling features of the second strategy modification control circuit 90, so that suitably handle exterior vibration, wherein second strategy is different from first strategy.
The precise characteristics of the controlling features that these are modified is the thing of design.For example, the gain of modification control circuit is possible.The cutoff frequency of for example revising the wave filter of control circuit also is possible.The selection of revising the parameter of control circuit is not a theme of the present invention.In addition, the control circuit itself with variable gain is known, thus do not need to be explained in more detail in fact how to change circuit parameter here, to revise controlling features.
Thereby in general: the controlling features of control circuit 90 comprises a plurality of variable controlled variable.The setting of at least one in these variable controlled variable changes as the function of two detection signals (two signals of the first and second promptly above-mentioned at least types) at least, this function makes implements described first strategy reliably under the situation of disc defect, and implements described second strategy reliably under the situation that externally shakes or vibrate.
Below, will explain this aspect of the present invention in more detail for the example case of control circuit with variable gain.
Fig. 2 is the block scheme that illustrates the part of exemplary control circuit 90 in more detail.In order to discuss, this part of control circuit 90 can relate to the control of radial actuator 51.Suppose: control circuit 90 comprises the PID controller 60 with input 61 and output 69.Radial error signal is received on 61 in input, and stands to have the processing of the first public amplifier 71 of variable gain k1.PID controller 60 comprises three parallel branch, i.e. P branch 62, I branch 63 and D branch 64, and each branch receives the input signal that amplifies, and each branch comprises amplifier 72,73,74 respectively, and these amplifiers have variable gain k2, k3, k4 respectively.P branch 62 comprises P processor 65, with P signal S POffer summing junction 68.I branch 63 comprises I processor 66, with I signal S 1Offer summing junction 68.D branch 64 comprises D processor 67, with D signal S DOffer summing junction 68.Summing junction output signal S+ experience has the processing of the second public amplifier 75 of variable gain k5.
Described gain k iIn (i represents 1-5) at least one and preferably all described gains change according at least two types signal, and every kind of signal is from Light detector signals S RIn derive.Therefore, each gain k iCan be described to the function f of two signal x1 and x2 i(x1, x2), x1 and x2 represent two types signal respectively.In a preferred embodiment, image signal MIRn is used as the signal x1 of the first kind, and normalization radial error signal REn is used as the signal x2 of second type.
Image signal MIRn is the measurement of the reflectivity of dish.Usually, this signal has the value of substantial constant, and following table is shown M, and it is irrelevant with vibrations or vibration basically, but it reduces rapidly under the situation of disc defect.Therefore, MIRn allows to distinguish disc defect and vibrations; For example, only might determine that disc defect occurs when MIRn＜α M, wherein α is the predetermined threshold value factor, for example α=0.9.As selection, substitute image signal MIRn, can be used as the signal of the first kind based on another signal of two or more single section output signals.The example that is suitable in the context of the present invention as this substitution signal of first kind signal is CA=A+B+C+D.
Normalization radial error signal REn is the measurement of spot displacement radially.As selection, substitute normalization radial error signal REn, can be used as the signal of second type based on another signal of two or more single section output signal sums, wherein at least one signal of these output signals (but not being whole) is multiplied by-1.Be suitable in the context of the present invention as the example of this substitution signal of second type signal be: S1-S2; A-B; FEn.
For instance, Fig. 3 shows the first possible function f 1 that is used to change the first gain k1.Notice that be used to change other function that gains k2-k5 and may equal f1, the function that changes other gain k2-k5 is mutually different, this also is possible, although the general shape of these functions will be similar at least.
Fig. 3 is the curve map that comprises curve 80, and this curve 80 is shown as gain k1 (Z-axis) function of the radial error REn (transverse axis) of the different value that is used for MIRn.Also might be shown as k1 the function of the MIRn (transverse axis) that is used for the REn different value, perhaps k1 is shown as three-dimensional curve diagram, this should be clearly.
In an illustrated embodiment, the first gain k1 has nominal value k1,0.As long as radial error is relatively little, promptly be lower than threshold value R T, then the first gain k1 is just at its nominal value k1, and 0 (transverse axis of curve 80 (stem) 83) gone up and kept constant.If radial error is at described threshold value R TOn, just the input signal MIRn according to second type increases (first branch 81 of curve 80) or reduces (second branch 82 of curve 80) first gain k1.If MIRn has the value of display disc defective, then the first gain k1 reduces.Otherwise if MIRn has the value of indication vibrations or vibration, then the first gain k1 increases.The amount that reduces or increase depends on the magnitude of REn respectively.Therefore, select the value of the first gain k1 according to two signals.
In principle, if having only the value of a described gain to depend at least two above-mentioned signals, then specifically implemented the present invention.Yet, preferably, change more than one described gain according at least two signals, more preferably change all described gains.Each gain can be associated with respective threshold, although threshold value R TAll be identical preferably for all gains.In addition, can each described gain be set according to the function separately of two (or a plurality of) signals, the function of even now (curve 80) all is identical for all gains preferably.
Fig. 4 is the curve map of the effect of the present invention of the relevant above-mentioned gain k1 of diagram.The left-hand part of Fig. 4 illustrates (periodically) and shakes situation on the 40Hz for example, and the right hand portion of Fig. 4 illustrates the situation of disc defect (black patches).
If it is constant that all gains all will keep on its respective nominal values, then dashed curve 101 and 102 shows the characteristic of radial error signal REn respectively, so control circuit 90 will be carried out Linear Control.Curve 101 has shown the sinusoidal characteristic of REn under (cycle) vibration situation.Under the blackspot situation, curve 102 shows the big peak value consistent with the luminous point that enters and leave blackspot.
Solid line 103 has shown the characteristic of radial error signal REn when the present invention is applied in (cycle) vibration situation.In the initial time interval before time t1, radial error signal REn is lower than threshold value R T, the k1 that therefore gains is positioned at its nominal value k1, on 0 (this is corresponding to the axis 83 of curve among Fig. 3 80).At time t1, radial error signal REn rises to threshold value R TMore than, and MIRn has its nominal value M that utilizes curve 111 indications.Corresponding with the branch 81 of curve among Fig. 3 80, k1 is from its nominal value k1 in gain, and 0 begins to increase, and in the case, reaches maximal value k1 MAX, shown in curve 121.In fact, REn still rises to threshold value R TMore than, still the maximal value that is reached by REn is lower than the value (curve 101) in the Linear Control situation.
When REn reduced, gain k1 also reduced, and at time t2, when REn drops into threshold value R TWhen following, gain k1 reaches its nominal value k1,0 once more.
This processing itself rises to threshold value R at the absolute value of REn at every turn TRepeat when above.
Solid line 104 shows the characteristic of radial error signal REn when the present invention is applied in the disc defect situation.In the initial time interval before time t3, radial error signal REn is lower than threshold value R TSo k1 is at its nominal value k1, on 0 (this is corresponding to the axis 83 of curve among Fig. 3 80) in gain.At time t3, radial error signal REn is elevated to threshold value R TMore than, and MIRn is reduced to below the switching threshold α M, shown in curve 112.Corresponding with the branch 82 of curve among Fig. 3 80, k1 is from its nominal value k1 in gain, and 0 reduces, and in the case, reaches minimum value k1 MIN, shown in curve 122.In fact, REn still rises to threshold value R TMore than, but the maximal value that REn reached is lower than the value (curve 102) in the Linear Control situation.
When REn reduced, gain k1 increased, and at time t4, when REn reduces to threshold value R TWhen following, gain k1 reaches its nominal value k1,0 once more.Luminous point has left black patches now, and image signal MIRn has turned back to its nominal value M.
Those skilled in the art should understand that the present invention is not limited to one exemplary embodiment discussed above, and multiple variation and revise all might fall within protection scope of the present invention that appended claim defines.
Explained the present invention in the above, with reference to the embodiment that wherein one or more gains is set according to two light signals.Also might revise other parameters of actuator control,, perhaps be with the centre frequency of logical or rejection filter such as the cutoff frequency of high pass or low-pass filter.Those skilled in the art should be understood that any controlled variable that has different the best settings for vibrations and disc defect situation can revise in the manner described above.In addition, it all is possible according to three or more signal any such controlled variable being set.In above-mentioned one exemplary embodiment, for example, might be focus error signal as the 3rd signal that shakes in the indication Z direction.
Explained the present invention in the above, with reference to embodiment with 6 sections photodetectors.Those skilled in the art should understand that the detecting device with different designs also is possible, and the formula of error signal can be different in the case.
In the above, referenced in schematic according to the block diagrams explaining of the functional block of device of the present invention the present invention.Be to be understood that, can utilize hardware to implement in these functional blocks one or several, the function that wherein this function is determined is carried out by each hardware ingredient, but also might utilize software to implement in these functional blocks one or several, therefore one or more program lines of this function functional utilization computer program of determining are carried out or are utilized and carry out such as the programmable device of microprocessor, microcontroller etc.

Claims (26)

1, a kind of method that is used for distinguishing the dissimilar disturbances of disc drive unit (1), described disc driving equipment (1) comprising:
Scanister (30) is used to scan the recording track of CD (2) and is used to generate read signal (S R);
This method may further comprise the steps:
From described read signal (S R) middle at least two signal (REn that derive different type; MIRn);
If one of described signal is (REn＞R in first value range T), another in second value range (MIRn＞α M) of described signal judges that then disturbance is corresponding to vibrations or vibration etc., and if the described (REn＞R in described first value range in the described signal simultaneously T), described another in the 3rd value range (MIRn＜α M) in the described signal judges that then disturbance is corresponding to disc defect simultaneously.
2, method according to claim 1, the described (REn in the wherein said signal; FEn) be the signal that spot displacement is measured.
3, method according to claim 1, the described (REn in the wherein said signal; FEn) be the signal that detecting device (35) is gone up certain type of asymmetric measurement of central spot.
4, method according to claim 1, described one (REn) in the wherein said signal is radial error signal.
5, method according to claim 1, described one (FEn) in the wherein said signal is focus error signal.
6, method according to claim 1, described another in the wherein said signal is the signal (MIRn) of dish albedo measurement.
7, method according to claim 1, wherein said scanister (30) comprises photodetector (35), described photodetector comprises a plurality of detector-segments (35a, 35b, 35c, 35d, 35e, 35f), be used for receiving beam reflected (32d) and be used to generate single detector signal (A, B respectively, C, D, S1, S2); With
Described (REn in the wherein said signal; FEn) be based on the signal of the summation of two or more single section output signals, wherein at least one in these single section output signal but not every signal times are with-1.
8, method according to claim 1, wherein said scanister (30) comprises photodetector (35), described photodetector comprises a plurality of detector-segments (35a, 35b, 35c, 35d, 35e, 35f), be used for receiving beam reflected (32d) and be used to generate single detector signal (A, B respectively, C, D, S1, S2); With
Described another (MIRn) in the wherein said signal is based on the signal of two or more single section output signal sums.
9, method according to claim 8, described another in the wherein said signal are normalization image signal (MIRn), and it is from all detector-segments (35a, 35b, 35c, 35d, 35e, 35f) all single detector signal (A, B, C, D, S1, S2) sum.
10, method according to claim 8, described another in the wherein said signal are central aperture signal (CA), and it is four central aperture detection device section (35a that arrange from the four-quadrant configuration, 35b, 35c, all single detector signal (A 35d), B, C, D) sum.
11, a kind of method that is used to control disc drive unit (1), this disc driving equipment (1) comprising:
Scanister (30) is used to scan the recording track of CD (2) and is used to generate read signal (S R);
Actuator devices (50) is used to control the location of at least one read/write element (34) of described scanister (30) with respect to dish (2);
Control circuit (90) is used to receive described read signal (S R) and according to described read signal (S R) at least one component of signal generate at least one actuator control signal (S CR), this control circuit (90) has at least one variable controlled variable;
This method may further comprise the steps:
Use the method for claim 1, distinguish dissimilar disturbances; With
Under the situation of disc defect,, under the situation of vibrations or vibration, change the setting of described at least one variable controlled variable according to second strategy (82) according to the setting of described at least one the variable controlled variable of first strategy (81) change.
12, a kind of method that is used to control disc drive unit (1), this disc driving equipment (1) comprising:
Scanister (30) is used to scan the recording track of CD (2) and is used to generate read signal (S R);
Actuator devices (50) is used to control the location of at least one read/write element (34) of described scanister (30) with respect to dish (2);
Control circuit (90) is used to receive described read signal (S R) and according to described read signal (S R) at least one component of signal generate at least one actuator control signal (S CR), this control circuit (90) has at least one variable controlled variable;
This method may further comprise the steps:
From described read signal (S R) middle at least two signal (REn that derive mutual same type; MIRn); With
As described at least two signal (REn; MIRn) function changes the setting of described at least one variable controlled variable.
13, method according to claim 12, wherein said at least one variable controlled variable are the gains of the signal Processing ingredient of described control circuit (90).
14, method according to claim 12, the first kind signal in wherein said at least two signals are the signals (MIRn) of the albedo measurement of dish.
15, method according to claim 12, wherein said scanister (30) comprises photodetector (35), described photodetector comprises a plurality of detector-segments (35a, 35b, 35c, 35d, 35e, 35f), be used for receiving beam reflected (32d) and be used to generate single detector signal (A, B respectively, C, D, S1, S2); With
First kind signal in wherein said at least two signals is based on the signal of two or more single section output signal sums.
16, method according to claim 15, wherein said first kind signal are normalization image signal (MIRn), and it is from all detector-segments (35a, 35b, 35c, 35d, 35e, 35f) all single detector signal (A, B, C, D, S1, S2) sum.
17, method according to claim 15, wherein said first kind signal are central aperture signal (CA), and it is four central aperture detection device section (35a that arrange from the four-quadrant configuration, 35b, 35c, all single detector signal (A 35d), B, C, D) sum.
18, method according to claim 12, second type signal in wherein said at least two signals are the signal (REn that spot displacement is measured; FEn).
19, method according to claim 12, second type signal in wherein said at least two signals are central spot goes up certain type asymmetric measurement at detecting device (35) signal (REn; FEn).
20, method according to claim 12, wherein said scanister (30) comprises photodetector (35), described photodetector comprises a plurality of detector-segments (35a, 35b, 35c, 35d, 35e, 35f), be used for receiving beam reflected (32d) and be used to generate single detector signal (A, B respectively, C, D, S1, S2); With
Second type signal in wherein said at least two signals is based on the signal of two or more single section output signal sums, and wherein at least one in these signals multiply by-1.
21, method according to claim 18, described second type signal in wherein said at least two signals is radial error signal (REn).
22, method according to claim 18, described second type signal in wherein said at least two signals is focus error signal (FEn).
23, method according to claim 12 is wherein as long as described second type signal (REn) is lower than predetermined threshold (R T), described at least one variable controlled variable (k1) just has nominal value (k1,0);
If wherein described second type signal (REn) is higher than described predetermined threshold (R T), described first kind signal (MIRn) satisfies the first condition (MIRn＞α M) of indication disturbing source from mechanical shock or vibration simultaneously, then changes the value (increase of described at least one variable controlled variable (k1) at first direction; 121);
If wherein described second type signal (REn) is higher than described predetermined threshold (R T), described first kind signal (MIRn) satisfies the second condition (MIRn＜α M) of indication disturbing source from disc defect simultaneously, then changes the value (reduction of described at least one variable controlled variable (k1) in the second direction that is different from described first direction; 122).
24, method according to claim 12 is wherein as long as described second type signal (REn) is lower than predetermined threshold (R T), described at least one variable controlled variable (k1) just has nominal value (k1,0);
If wherein described second type signal (REn) is higher than described predetermined threshold (R T), described first kind signal (MIRn) satisfies the first condition (MIRn＞α M) of the conventional reflectivity of display disc simultaneously, then changes the value (increase of described at least one variable controlled variable (k1) at first direction; 121); With
If wherein described second type signal (REn) is higher than described predetermined threshold (R T), described first kind signal (MIRn) satisfies the second condition that reduces reflectivity (MIRn＜α M) of display disc simultaneously, then changes the value (reduction of described at least one variable controlled variable (k1) in the second direction that is different from described first direction; 122).
25, a kind of disc driving equipment (1) comprising:
Scanister (30) is used to scan the recording track of CD (2) and is used to generate read signal (S R);
Actuator devices (50) is used to control the location of at least one read/write element (34) of described scanister (30) with respect to dish (2);
Control circuit (90) is used to receive described read signal (S R) and according to described read signal (S R) at least one component of signal generate at least one actuator control signal (S CR), this control circuit (90) has at least one variable controlled variable;
This control circuit (90) is suitable for enforcement of rights and requires 1 method.
26, a kind of disc driving equipment (1) comprising:
Scanister (30) is used to scan the recording track of CD (2) and is used to generate read signal (S R);
Actuator devices (50) is used to control the location of at least one read/write element (34) of described scanister (30) with respect to dish (2);
Control circuit (90) is used to receive described read signal (S R) and according to described read signal (S R) at least one component of signal generate at least one actuator control signal (S CR), this control circuit (90) has at least one variable controlled variable;
This control circuit (90) is suitable for enforcement of rights and requires 12 method.
CNA2004800285918A 2003-10-02 2004-09-28 Disc drive apparatus Pending CN1860533A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP03103662 2003-10-02
EP03103662.7 2003-10-02

Publications (1)

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CN1860533A true CN1860533A (en) 2006-11-08

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CNA2004800285918A Pending CN1860533A (en) 2003-10-02 2004-09-28 Disc drive apparatus

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EP (1) EP1671320A2 (en)
JP (1) JP2007507822A (en)
KR (1) KR20060088890A (en)
CN (1) CN1860533A (en)
TW (1) TW200516572A (en)
WO (1) WO2005034103A2 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19640870A1 (en) * 1996-10-04 1998-04-09 Thomson Brandt Gmbh Recording or reproducing device for optical information carriers with a servo control circuit and method for error signal handling in such
DE19931835A1 (en) * 1999-07-09 2001-01-11 Thomson Brandt Gmbh Optical recording carrier read-write device with digital controller, has reference input of analog-to-digital converter (ADC) used for connection to output of summation unit
KR20030019948A (en) * 2001-05-03 2003-03-07 코닌클리케 필립스 일렉트로닉스 엔.브이. Optical scanning device
JP3566701B2 (en) * 2002-01-31 2004-09-15 株式会社東芝 Optical disk recording and playback device

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WO2005034103A3 (en) 2005-08-25
KR20060088890A (en) 2006-08-07
TW200516572A (en) 2005-05-16
JP2007507822A (en) 2007-03-29
WO2005034103A2 (en) 2005-04-14
EP1671320A2 (en) 2006-06-21

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