CN100407301C - Optical recording/reproducing apparatus, focusing method therefor, and optical disk recording medium - Google Patents
Optical recording/reproducing apparatus, focusing method therefor, and optical disk recording medium Download PDFInfo
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- CN100407301C CN100407301C CN2005100966605A CN200510096660A CN100407301C CN 100407301 C CN100407301 C CN 100407301C CN 2005100966605 A CN2005100966605 A CN 2005100966605A CN 200510096660 A CN200510096660 A CN 200510096660A CN 100407301 C CN100407301 C CN 100407301C
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Abstract
Optical recording/reproducing apparatus, focusing method therefor, and optical disk recording medium are provided. Focus jumping means (DSP (51)) is provided to effect focus jumping for moving the laser spot from one recording layer to another of a multilayer optical disk (10) having a plurality of recording layers depending on the recording/reproducing operation for recording data on the multilayer optical disk or reproducing recorded data from it. The focus jumping means conducts acceleration for moving an objective (34) installed in an optical pickup to move its focus from one recording layer to another of the multilayer optical disk, stands by, and deceleration for stopping the objective.
Description
Patented claim of the present invention is that international filing date is that July 26, application number in 2002 are 02814627.1, denomination of invention is divided an application for the application for a patent for invention of " optical data recording/reproducing device, its focus method and optical disc recording medium ".
Background technology
The present invention relates to CD (dish) data recording/reproducing device and method.
Particularly, the present invention relates to a kind of technology that is used for reliablely and stablely carrying out the focus jump operation at optical data recording/reproducing device (CD drive), wherein, described device can have recording/reproducing data on the multiplayer optical disk of two or more recording layers, and the focus jump operation is used for moving between recording layer.
Can be in the CD drive (optical data recording/reproducing device) of the enterprising line item of the multiplayer optical disk with a plurality of recording layers/reproduction, the focus jump operation be used for moving the bundle spot between recording layer.The operation of this focus jump in conjunction with acceleration pulse and deceleration pulse with mobile object lens (object lens), thereby between recording layer high-speed mobile bundle spot.This method of operating and the tracking skip operation that moves between track in tracking servo control are similar substantially.Should point out that the redirect direction of focus jump operation is along the redirect of focus direction between recording layer, redirect is different with following the tracks of.
The tracking skip operation that explained later is carried out in optical data recording/reproducing device embodiment of the present invention equally.Shown in Figure 1A, in following the tracks of skip operation, tracking error signal TE changes with sinusoidal wave state, and therefore, can correctly know the position of the relative target track of bundle spot, and can correctly provide the time of acceleration as variable service time,
Pulse waveform for example illustrates shown in Figure 1B: in order to drive coaxial actuator 35 shown in Figure 4 so that object lens 34 move to target track, tracking control section in the digital signal processor (DSP) 51 sends acceleration pulse ACCE by tracking driver 52 to coaxial actuator 35, as following the tracks of redirect drive signal TJ
Drv, quicken object lens 34 by coaxial actuator, make it to move upward the track side, then, the tracking control section among the DSP 51 sends deceleration pulse DECCE to tracking driver 57, as following the tracks of redirect drive signal TJ
Drv, so that the deceleration of motion of object lens 34 on tracking direction.
The focus jump of redirect operation between a plurality of recording layers of bundle spot that are used for making object lens 34 outputs at CD, shown in Fig. 2 A and 2B, from n recording layer nL focus jump to adjacent (n+1) individual recording layer (n+1) L, near recording layer, be not easy to observe the variation of (detection) focus error signal TE and summing signal RF, thereby, near the recording layer of focus jump, be difficult to determine exactly that the acceleration time of coaxial actuator is so that focus jump becomes stable.Thereby shown in Fig. 2 C, the focus jump control assembly sends the acceleration pulse ACCE that is used to drive coaxial actuator at time t1, as focus jump drive signal FJ
Drv, predict the movement velocity of object lens at this moment, and, when focus error signal FE surpasses threshold value FE
ThThe time, the time t2 after the schedule time sends the deceleration pulse DECCE that is used to drive coaxial actuator 35 in the past, as focus jump drive signal FJ
DrvThat is, the focus jump control assembly adopts prediction and quickens and the coaxial actuator that slows down near the target record layer of CD, to carry out focus jump.
The disk drive (optical data recording/reproducing device) that possesses the focus jump function has been arranged on market, and as DVD (digital multi-purpose disk) video player, wherein, described disk drive is carried out the control method by this kind prediction.Used for example disclosed technology in the uncensored patent publications of Japan (kokai) No.10-143872, international monopoly publication No.WO98/05032 etc.
The technology of announcing in the uncensored patent publications of Japan (kokai) No.10-143872 adopts estimation to be installed in the technology of the movement velocity of the object lens on the optical pickup apparatus, estimate when the target record layer surpasses certain threshold value to it when surpassing certain level from the original records layer of focusing error before focus jump, and the brake pulse of generation shown in Fig. 2 A-2C.
Yet, in the uncensored patent publications of Japan (kokai) No.10-143872 in the disclosed technology, when distance is with reference value CD devious between the recording layer when packing in optical data recording/reproducing device, error takes place in the estimation movement velocity of object lens, therefore, focus jump might become unstable.
International monopoly publication No.WO98/05032 discloses a kind of technology of determining the amplitude of brake pulse from the maximal value of focus error signal differential.
In Japan uncensored patent publications (kokai) No.10-143872 and international monopoly publication No.WO98/05032, correctly manage the reflectivity in each recording layer of CD.These are technology of carrying out in the DVD video player, wherein, in each recording layer of a plurality of recording layers, obtain good S-curve for focusing error.Yet, reaching in the more highdensity disc driving system, become bigger because of the substrate thickness of CD changes the aberration effect that causes in the numerical aperture (NA) that increases object lens.For example, as shown in Figure 3A, when numerical aperture (NA) hour, obtain to have the S-curve of the positive and negative characteristic of symmetry for focusing error, still, shown in Fig. 3 B, when NA was big, the positive and negative characteristic of S-curve became asymmetric sometimes.Shown in Fig. 3 B, when the S-curve becomes asymmetric between positive and negative, can not correctly be identified for the switching time of the acceleration and the deceleration of the coaxial actuator of mobile object lens 34 on focus direction.
And then, be used for the compact disc rocordable driver of recoding/reproduction, reflectivity in each recording layer of CD also changes, therefore, with the same in tracking Control, for the method for determining the deceleration time of coaxial actuator by the value of S-curve of inquiry focusing error, can not realize that stable focus jump operates.
Summary of the invention
The purpose of this invention is to provide optical data recording/reproducing device and the method for using CD with a plurality of recording layers, even under the situation that the waveform of the S-of focus error signal curve changes because of aberration or under the level situation that the variation of reflectivity changes in a plurality of recording layers because of CD at the S-curve, described apparatus and method also can realize stable focus jump operation, wherein, aberration is caused by the variation of the substrate thickness of CD.
The invention provides a kind of optical data recording/reproducing device with focus actuator, this focus actuator is used for carrying out with recoding/reproduction operates corresponding focus jump operation, described focus jump operation is used to make laser beam spot to move between a plurality of recording layers of the multiplayer optical disk with a plurality of recording layers, the operation of described recoding/reproduction is used at described multiplayer optical disk identifying recording layer or is used to reproduce the data of record, described optical data recording/reproducing device comprises: optical pickup apparatus, optical pickup apparatus has object lens, the focus actuator of mobile object lens on focus direction, be used to launch the beam emissions parts of light beam, be used to receive the light-receiving member of the light that returns from described CD, and optical system, described optical system is used for the light beam from described beam emissions parts is directed to described object lens and the back light that incides on the described object lens from described CD is directed to described light-receiving member; The focus error signal production part is based on from the signal of described light-receiving member and produce focus error signal; The summing signal production part is based on from the signal of described light-receiving member and produce summing signal; And focusing drive control component; Wherein said focusing drive control component is carried out following action: to described focus actuator output acceleration pulse signal, so that described object lens move on focus direction, handle navigates to the target localization recording layer of described multiplayer optical disk when applying focus jump commencing signal and target localization recording layer signal with box lunch from the bundle spot of described object lens, waited for for first stand-by period, when waiting for described first stand-by period during the currency of the current summing signal that produces from the back light of described CD express minimum value, and then by the value that will described current summing signal obtains divided by reflectivity information during above threshold value by the specified recording layer of target localization recording layer signal, export the mobile first deceleration pulse signal that slows down that is used for described object lens to described focus actuator, wherein, target localization recording layer signal record is in the recording layer of described multiplayer optical disk, waited for for second stand-by period, and when waiting for described second stand-by period during the absolute value representation of the described focus error signal that produces of the back light of described CD go out maximal value and when then intersecting, be used to stop second deceleration pulse that moves of described object lens to described focus actuator output with zero.
Description of drawings
From the description below in conjunction with accompanying drawing, above and other purpose of the present invention and feature will become clearer.
Figure 1A and 1B are the oscillogram of tracking error signal and track redirect drive signal in the tracking skip operation.
Fig. 2 A-2C is the oscillogram of focus error signal, summing signal and focus jump drive signal in the focus jump operation.
Fig. 3 A and 3B be in focus jump operation when numerical aperture is little and when the oscillogram of numerical aperture focus error signal than greatly the time.
Fig. 4 is the arrangement plan as the multiplayer optical disk data recording/reproducing device (disk drive) of the basic embodiment of optical data recording/reproducing device of the present invention.
Fig. 5 illustrates the section configuration of multiplayer optical disk shown in Fig. 4 and the view of bundle spot focus jump state.
The view of Fig. 6 for handling with the phase compensation shown in the block configuration by digital signal processor shown in Fig. 4 (DSP) execution.
The process flow diagram that Fig. 7 handles for the focus control of carrying out after being encased in the multiplayer optical disk data recording/reproducing device shown in Figure 4 (disk drive) at CD, this focus control is handled as the first embodiment of the present invention.
Fig. 8 A-8C is the figure of the variation of focus error signal, summing signal and focus drive signal in the focus jump of first embodiment (focus on and introduce) operation.
Fig. 9 A is the block diagram that is used for the high frequency phase lead compensation wave filter of compensating focusing error signal in DSP shown in Figure 4; Fig. 9 B is the amplitude of the wave filter of high frequency phase lead compensation shown in Fig. 9 A and the frequency characteristic figure of phase place; Fig. 9 C is for (dotted line) under the situation of crossing Fig. 9 A high frequency phase lead compensation wave filter at focusing error (FE) nonpassage of signal with in the oscillogram of focusing error (FE) signal by (solid line) under the situation of high frequency phase lead compensation wave filter; And Fig. 9 D is for (dotted line) under the situation of crossing Fig. 9 A high frequency phase lead compensation wave filter at the brake pulse nonpassage of signal with in the oscillogram of brake pulse signal by (solid line) under the situation of high frequency phase lead compensation wave filter.
Figure 10 is the process flow diagram of handling as the focus control of second embodiment of the invention.
Figure 11 A-11C is the oscillogram of focus error signal, summing signal and focus jump drive signal in the focus jump operation of second embodiment.
Figure 12 is the process flow diagram of handling as the focus control of third embodiment of the invention.
Figure 13 A-13C is the oscillogram of focus error signal, summing signal and focus jump drive signal in the focus jump operation of the 3rd embodiment.
Figure 14 is the synoptic diagram of the cross-section structure of multiplayer optical disk in the schematically illustrated fourth embodiment of the invention.
Figure 15 A-15B is the figure that is used for explaining the method for each the recording layer summing signal level that calculates CD shown in Figure 14.
Figure 16 is the process flow diagram that the focus control of fourth embodiment of the invention is handled.
Figure 17 A-17C for focus error signal in the operation of the focus jump of fourth embodiment of the invention, by with current summing signal divided by the target record layer in the value that obtains of summing signal level and the oscillogram of focus jump drive signal.
The reference number tabulation
10, the 10A.. multiplayer optical disk
21.. spindle motor
30.. optical pickup apparatus
31.. laser diode (LD)
32.. photoelectric detector (PD)
33.. optical system
34.. object lens
35.. coaxial actuator
36.. sled motor
42..LD driver
50.. servoboard
(51..DSP digital signal processor)
56.. focus driver
57.. tracking driver
58.. sled motor driver
59.. spindle motor driver
60.. control microcomputer
Embodiment
According to a first aspect of the invention, a kind of optical data recording/reproducing device is provided, this device is used for carrying out with recoding/reproduction operates corresponding focus jump operation, the focus jump operation is used to make the bundle spot to move between a plurality of recording layers of the multiplayer optical disk with a plurality of recording layers, the recoding/reproduction operation is used at the multiplayer optical disk identifying recording layer or is used to reproduce the data that are recorded on the multiplayer optical disk, this device comprises: (a) optical pickup apparatus, optical pickup apparatus has object lens, the focus actuator of mobile object lens on focus direction, be used to launch the beam emissions parts of light beam, be used to receive the light-receiving member of the light that returns from CD, and optical system, optical system is used for the light beam of beam emissions parts is directed to object lens and the back light that incides on the object lens from CD is directed to light-receiving member, and (b) focus on drive control component, these parts are exported focus drive signal to focus actuator, so that object lens move on focus direction, when applying focus jump commencing signal and target localization recording layer signal, be used for the bundle spot of object lens is navigated to the target localization recording layer of multiplayer optical disk, and these parts are exported first deceleration pulse by inquiring about focus error signal and summing signal to focus actuator, described focus error signal and summing signal obtain according to the shift position of object lens, and described object lens are driven by focus actuator.
According to a second aspect of the invention, a kind of optical disc recording/reproducing method is provided, this method is used for carrying out with recoding/reproduction operates corresponding focus jump operation, the focus jump operation is used to make the bundle spot to move between a plurality of recording layers of the multiplayer optical disk with a plurality of recording layers, the recoding/reproduction operation is used at the multiplayer optical disk identifying recording layer or is used to reproduce the data that are recorded on the multiplayer optical disk, this method comprises: step from focus drive signal to focus actuator that (a) export, so that object lens move on focus direction, when applying focus jump commencing signal and target localization recording layer signal, be used for the bundle spot of object lens is navigated to the target localization recording layer of multiplayer optical disk, and step from first deceleration pulse to focus actuator that (b) export by inquiring about focus error signal and summing signal, described focus error signal and summing signal obtain according to the shift position of object lens, and described object lens are driven by focus actuator.
According to a third aspect of the invention we, a kind of optical data recording/reproducing device is provided, this device is used for carrying out with recoding/reproduction operates corresponding focus jump operation, the focus jump operation is used to make the bundle spot to move between a plurality of recording layers of the multiplayer optical disk with a plurality of recording layers, the recoding/reproduction operation is used at the multiplayer optical disk identifying recording layer or is used to reproduce the data that are recorded on the multiplayer optical disk, this device comprises: (a) optical pickup apparatus, optical pickup apparatus has object lens, the focus actuator of mobile object lens on focus direction, be used to launch the beam emissions parts of light beam, be used to receive the light-receiving member of the light that returns from CD, and optical system, optical system is used for the light beam of beam emissions parts is directed to object lens and the back light that incides on the object lens from CD is directed to light-receiving member, and (b) focus on drive control component, these parts are to focus actuator output acceleration pulse signal, so that object lens move on focus direction, when applying focus jump commencing signal and target localization recording layer signal, the bundle spot of object lens is navigated to the target localization recording layer of multiplayer optical disk, accurately waited for for first stand-by period, and be used to stop the first deceleration pulse signal of object lens motion to focus actuator output.
According to a forth aspect of the invention, a kind of optical disc recording/reproducing method is provided, this method is used for carrying out with recoding/reproduction operates corresponding focus jump operation, the focus jump operation is used to make the bundle spot to move between a plurality of recording layers of the multiplayer optical disk with a plurality of recording layers, the recoding/reproduction operation is used at the multiplayer optical disk identifying recording layer or is used to reproduce the data that are recorded on the multiplayer optical disk, this method comprises: step from the acceleration pulse signal to focus actuator that (a) export, so that object lens move, when applying focus jump commencing signal and target localization recording layer signal, the bundle spot of object lens is navigated to the target localization recording layer of multiplayer optical disk on focus direction; (b) accurately wait for the step of first stand-by period; And the first deceleration pulse signal that (c) is used to stop the object lens motion to focus actuator output.
According to a fifth aspect of the invention, a kind of optical data recording/reproducing device is provided, this device is used for carrying out with recoding/reproduction operates corresponding focus jump operation, the focus jump operation is used to make the bundle spot to move between a plurality of recording layers of the multiplayer optical disk with a plurality of recording layers, the recoding/reproduction operation is used for writing down at the multiplayer optical disk identifying recording layer and on a recording layer reflectivity of recording layer quantity information and each recording layer, perhaps be used to reproduce the data that are recorded on the multiplayer optical disk, this device comprises: (a) optical pickup apparatus, optical pickup apparatus has object lens, the focus actuator of mobile object lens on focus direction, be used to launch the beam emissions parts of light beam, be used to receive the light-receiving member of the light that returns from CD, and optical system, optical system is used for the light beam of beam emissions parts is directed to object lens and the back light that incides on the object lens from CD is directed to light-receiving member; (b) focus error signal production part is based on the signal of light-receiving member and produce focus error signal; (c) summing signal production part is based on the signal of light-receiving member and produce summing signal; And (d) focus on drive control component, these parts are used for to focus actuator output acceleration pulse signal, so that object lens move on focus direction, when applying focus jump commencing signal and target localization recording layer signal, the bundle spot of object lens is navigated to the target localization recording layer of multiplayer optical disk, accurately waited for for first stand-by period, when summing signal is expressed minimum value in the first wait process, and then when the value that obtains divided by the reflectivity information by the specified recording layer of target localization recording layer signal by current summing signal surpasses threshold value, export mobile first brake pulse that slows down that is used for object lens to focus actuator, wherein, target localization recording layer signal record is in the recording layer of multiplayer optical disk, accurately waited for for second stand-by period, and when the absolute value representation of focus error signal in the second wait process goes out maximal value and follows with zero intersecting, be used to stop second brake pulse that object lens move to focus actuator output.
According to a sixth aspect of the invention, a kind of optical disc recording/reproducing method is provided, this method is used for carrying out with recoding/reproduction operates corresponding focus jump operation, the focus jump operation is used to make the bundle spot to move between a plurality of recording layers of the multiplayer optical disk with a plurality of recording layers, the recoding/reproduction operation is used for writing down at the multiplayer optical disk identifying recording layer and on a recording layer reflectivity of recording layer quantity information and each recording layer, perhaps be used to reproduce the data that are recorded on the multiplayer optical disk, this method comprises: step from the acceleration pulse signal to focus actuator that (a) export, so that object lens move, when applying focus jump commencing signal and target localization recording layer signal, the bundle spot of object lens is navigated to the target localization recording layer of multiplayer optical disk on focus direction; (b) accurately wait for the step of first stand-by period; (c) when summing signal is expressed minimum value in the first wait process, and then when the value that obtains divided by the reflectivity information by the specified recording layer of target localization recording layer signal by current summing signal surpasses threshold value, the step that is used for first brake pulse that the motion of object lens is slowed down to focus actuator output, wherein, target localization recording layer signal record is in the recording layer of multiplayer optical disk; (d) accurately wait for the step of second stand-by period; And (e) when the absolute value representation of focus error signal in the second wait process goes out maximal value and then intersects with zero, be used to stop the step of second brake pulse that object lens move to focus actuator output.
According to a seventh aspect of the invention, a kind of optical data recording/reproducing device is provided, this device is used for carrying out with recoding/reproduction operates corresponding focus jump operation, the focus jump operation is used to make the bundle spot to move between a plurality of recording layers of the multiplayer optical disk with a plurality of recording layers, the recoding/reproduction operation is used at the multiplayer optical disk identifying recording layer or is used to reproduce the data that are recorded on the multiplayer optical disk, this device is provided with the focusing drive control component, these parts:, be used for the recording layer that the bundle spot that is installed in the object lens on the optical pickup apparatus is currently located at from multiplayer optical disk bundle spot is moved to the recording layer of appointment to the focus actuator effect acceleration pulse signal of mobile object lens on focus direction; Then, to focus actuator output deceleration pulse signal, near the motion to object lens the designated recorder layer is slowed down; And, after the absolute value of absolute value greater than the momentum of deceleration pulse signal of the momentum that makes the acceleration pulse signal, the momentum of output acceleration pulse signal.
According to an eighth aspect of the invention, a kind of optical data recording/reproducing device with focus actuator is provided, this focus actuator is used for carrying out with recoding/reproduction operates corresponding focus jump operation, the focus jump operation is used to make laser beam spot to move between a plurality of recording layers of the multiplayer optical disk with a plurality of recording layers, recoding/reproduction operation is used at the multiplayer optical disk identifying recording layer or is used to reproduce the data of record, this device is provided with the focusing drive control component, it applies the acceleration pulse signal to focus actuator, is used for the recording layer that the bundle spot that is installed in the object lens on the optical pickup apparatus is currently located at from multiplayer optical disk bundle spot is moved to the recording layer of appointment; After this to the focus actuator effect first deceleration pulse signal; And,, apply the second deceleration pulse signal when focus error signal becomes when being not more than specific level on the recording layer as target.
According to a ninth aspect of the invention, provide a kind of by writing or the read-only optical disc recording medium that stacked a plurality of recording layers form, wherein, optical disc recording medium is characterised in that: the recording layer sum of optical disc recording medium is recorded in the presumptive area of CD.
According to the tenth aspect of the invention, provide a kind of by writing or the read-only optical disc recording medium that stacked a plurality of recording layers form, wherein, optical disc recording medium is characterised in that: the reflectivity when the bundle spot focuses on each recording layer is recorded in the presumptive area of CD in advance.
Explain the preferred embodiment of CD of the present invention (dish) data recording/reproducing device and method below in conjunction with accompanying drawing.
Basic terms
Before describing the preferred embodiments of the present invention, explain the optical data recording/reproducing device of the embodiment of the invention and the basic terms and the condition of method earlier.
And then the momentum that acceleration pulse affacts on the object lens is bigger a little than the momentum of deceleration pulse.When deceleration pulse finishes, the bundle spot under the state that speed fully reduces near target record layer (layer).
" momentum " refers to that the duration of pulse be multiply by pulse-response amplitude and the value that obtains." momentum " refers to the variation by the speed of the object lens of coaxial actuator driven.
Condition 2. for become in focusing error certain level or more hour (front is a bit slightly at focal position) make the movement velocity of object lens approach 0, deceleration pulse (brake pulse) affacts the actuator that is used for mobile object lens.
The momentum of deceleration pulse (brake pulse) is the numerical value that the differential by focus error signal S-curve obtains divided by the level of summing signal RF, arrival rate when promptly the bundle spot of the value of being somebody's turn to do and object lens arrives CD target record layer is proportional, wherein, must carry out focus jump to this CD.Because might there be minor deviations in the influence of aberration etc. between brake pulse and the optimum value, but the movement velocity of object lens descended at this moment, thereby the conventional focus servo control by execution the focus jump EO after can absorb this deviation.
According to condition 1 and 2, can write in the multilayer disc in this kind high density, the bundle spot can stably move between recording layer, wherein, in this CD, interfloor distance and reference value between a plurality of recording layers of CD have deviation, perhaps can not always obtain constant S-curve near each recording layer.
And then, by the actuator that is used for mobile object lens being applied and the proportional value of the differential of focus error signal,, also might make to focus on and introduce stable operation as brake pulse.
In this description, the bundle spot that makes object lens is called " focus jump operation " from the operation that certain recording layer of CD with a plurality of recording layers jumps to another recording layer, and the moment that the bundle spot focuses on the target record layer is called " focus on to introduce and finish ".
After focusing on introducing, conventional focus servo control is transferred in control.Carry out focus servo control by available circuit and existing method.Correspondingly, in this description, the main explanation is used to carry out focus jump control and carries out the control that focusing is introduced.
Further, in optical data recording/reproducing device of the present invention, in the focus jump operating process, carry out tracking servo control, but tracking servo control not theme of the present invention, therefore omits its detailed description.In an identical manner, in optical data recording/reproducing device of the present invention, when carrying out focus servo control, carry out the track skip operation, but omit its detailed description by driving the sled motor.
First embodiment
Explain first embodiment of optical data recording/reproducing device of the present invention and method in conjunction with Fig. 4 to Fig. 9 A-9D.
Fig. 4 is the arrangement plan of the multiplayer optical disk data recording/reproducing device (disk drive) of the basic embodiment of optical data recording/reproducing device of the present invention.
Described optical data recording/reproducing device has optical pickup apparatus 30, servoboard 50, spindle motor 21, rotating disk 22, the plate 23 that is installed, laser diode (LD) driver 42 and summing signal amplifier 41.
Fig. 5 illustrates the section configuration of multiplayer optical disk shown in Figure 4 and the view of bundle spot focus jump state.
Multiplayer optical disk 10 shown in Figure 4 is dual layer discs with two information recording layers as shown in Figure 5, and second recording layer 12 and first recording layer 13 and the transmittance overlayer 15 that comprise substrate 11, form on substrate 11.The bundle spot that Fig. 5 illustrates the object lens of representing with solid line 34 shine the state of first recording layer 13 and the bundle spot focus jump of the object lens 34 that dot to the state of second recording layer 12.
Multiplayer optical disk 10 is encased in the rotating disk 22 and with the plate 23 that is installed and fixes, and wherein, rotating disk 22 is connected to spindle motor 21.Control microcomputer 60 is carried out information recording/regenerating by 30 pairs of CDs 10 that driven by spindle motor 21 rotations of optical pickup apparatus.
For replacing coaxial actuator 35, also might be configured to this actuator respectively be used at first actuator that drives object lens 34 on the focus direction and second actuator that is used for mobile object lens 34 on orbital direction.
Main points of the present invention are to make the bundle spot of object lens 34 to carry out focus jump between a plurality of recording layers of multiplayer optical disk 10.Below concentrate and describe the driving of coaxial actuator 35 on focus direction or the driving of first actuator.
Under the control of digital signal processor (DSP) 51, drive sled motor 36 by sled motor driver 58, and optical pickup apparatus 30 is moved on the direction that the track with CD 10 intersects.
The output of photoelectric detector 32 offers the RF amplifier circuit (RF amplifier) 41 that is used to amplify summing signal RF, and offers servoboard 50 simultaneously.Processing by focusing error processor 51A, produce focus error signal FE from the output that is input to servoboard 50 photoelectric detectors 32, the summing signal RF that generation is handled by summing signal processor 51B, and tracking error processor 51C produces tracking error signal TE by handling.
Three signal FE, RF that produced and the radio-frequency component of TE are eliminated in three low-pass filters that are arranged in parallel (LPF) 52, and pass through low-frequency component.And then the low-frequency component that passes through is converted to digital signal in three AD converter that are arranged in parallel (ADC) 53, and the conversion digital signal output to DSP 51, to carry out high speed processing.
Explain that as shown in Figure 6 DSP 51 carries out the control and treatment of beginning focus jump operation based on the focus jump initiation command of exporting from control microcomputer 60, and to focus error signal FE and tracking error signal TE excute phase compensation (with reference to Fig. 9 A).Preferably, DSP 51 according to through the value of the focus error signal FE of phase compensation and summing signal RF and to focus jump operation carry out control and treatment.That is, except being used as above-mentioned phase compensation processing element, DSP 51 is also as focus jump processing element of the present invention.In the present embodiment, control microcomputer 60 is carried out the integral body control of optical data recording/reproducing device.Carry out the required focus control of high speed processing by DSP 51 and handle, focus control is handled and is comprised focus jump operation and phase compensation processing.
Three DA converter (DAC) 54 that are arranged in parallel are converted to simulating signal to the digital output signal of DSP 51.Extract process phase compensation in the corresponding low-pass filter (LPF) in three LPF that are arranged in parallel 55 and be converted to the focus error signal FE of simulating signal and the low-frequency component of tracking error signal TE.
The focus drive signal F of process phase compensation in DSP 51
Drv, follow the tracks of drive signal TR
DrvWith sled motor drive signal SM
DrvLow-frequency component affact focus driver 56, tracking driver 57 and sled motor driver 58, thereby drive coaxial actuator 35 and sled motor 36.
The bundle spot that coaxial actuator 35 is assembled object lens 34 navigates on the required recording layer of CD 10, and moves the bundle spot to the track of needs.Sled motor 36 is with bigger increment mobile optical pick-up 30 on orbital direction.
The view of Fig. 6 for handling with the phase compensation shown in the block configuration by digital signal processor shown in Figure 4 (DSP) execution.
The DSP 51 that is used for excute phase compensation have to focus error signal FE carry out phase compensation first phase compensation component 511, tracking error signal TE is carried out second phase compensation component 512 of phase compensation and produces the timing signal production part 513 that focuses on beginning and focus jump timing signal based on summing signal RF and focus error signal FE.
The output signal that first switch 514, second switch 515 and low frequency component promote wave filter (LBF) parts 516 is converted to simulating signal from digital signal in three DA converters (DAC) 54 that are arranged in parallel.Resulting drive signal is by three low-pass filters that are arranged in parallel (LPF) 55, and then, low-frequency component sends to the corresponding driving device, i.e. focus driver 56, tracking driver 57 and sled motor driver 58.Under the control of control microcomputer 60, rotate driving CD 10 by operation axis motor driver 59.For the CD 10 that rotates in this way, sled motor driver 58 drives sled motor 36, with mobile optical pick-up 30 on the orbital direction of CD 10, simultaneously, focus driver 56 and tracking driver 57 drives coaxial actuator 35, and the bundle spot of object lens 34 is carried out focus servo control and tracking servo control.
The track redirect control of the tracking Control of object lens 34 and use sled motor 36 is not theme of the present invention, therefore omits and describes in detail.The front has provided the general introduction of tracking Control in conjunction with Figure 1A-1B.
Fig. 7 introduces the process flow diagram of (focus jump) operation for the focusing of the first embodiment of the invention carried out by DPS 51 after CD is encased in the multiplayer optical disk data recording/reproducing device shown in Figure 4 (disk drive).
Fig. 8 A-8C is focus error signal FE, summing signal RF and focus jump drive signal FJ when the focusing of first embodiment is introduced
DrvThe figure of variation.
Step S1: begin to focus on to introduce and operate
When the time of Fig. 8 C t1 introduces (focus jump) initiation command from controlling microcomputer 60 collectiong focusings, DPS 51 is to focus driver 56 output focus jump drive signal FJ
Drv, this signal increases with the slope of constant gradient, and shown in Fig. 8 C, thereby object lens 34 move closer to CD 10.By like this, focus jump drive signal FJ
DrvAffact coaxial actuator 35 from focus driver 56, and coaxial actuator 35 is mobile object lens 34 on focus direction.Photoelectric detector 32 detects this signal according to the motion of object lens 34, focus error signal generation unit (processor) 51A is from the focus error signal FE of detection signal generation shown in Fig. 8 A of photoelectric detector 32, summing signal generation unit (processor) 51B is from the summing signal RF of detection signal generation shown in Fig. 8 B of photoelectric detector 32, and tracking error signal generation unit (processor) 51C is from the detection signal generation tracking error signal TE of photoelectric detector 32.
The inertia of consideration object lens 34 and coaxial actuator 35, response etc., control focus jump drive signal FJ
DrvGradient be certain value, by this value, response is because of object lens 34 movement velocitys reduce too slowly, and the bundle spot is not because of object lens 34 movement velocitys overshoot recording layer too soon.
Step S2-S5: focus jump is handled
When DSP 51 detects at the time of Fig. 8 A t2 focus error signal FE above predetermined level FEon (S2) and when the time of Fig. 8 B t3 summing signal RF surpasses level PIon (S3), and then when detecting when the time of Fig. 8 A t4 focus error signal FE becomes than zero crossing threshold value FEzc littler (S4) with zero crossing (ZC) and its absolute value, DSP 51 calculates the differential (dFE/dt) of focus error signal FE at time t4, and at the time of Fig. 8 C t5 to the focus driver 56 output first brake pulse signal BRK1 (or first deceleration pulse DECCE1), reach regular hour Δ tbrk (S5), wherein, the amplitude A brk=kx (dFE/dt) of this first brake pulse signal (k is a proportionality constant) and described differential are proportional, and time t5 and time t4 are much at one.By like this, stop the motion of object lens 34.
The first brake pulse signal BRK1 is the signal that is used to stop object lens 34 motions.According to this moment object lens 34 acceleration of motion make pulse signal with momentum, therefore, BRK1 has the proportional amplitude of differential (dFE/dt) with focus error signal FE at time t4.
According to the polarity of focus error signal FE with zero side that intersects, and the amplitude polarity of definite first brake pulse signal BRK1.For example, when focus error signal FE when positive polarity one side direction negative polarity one side intersects with zero, DSP 51 is the amplitude reversing of the first brake pulse signal BRK1 negative polarity.In this way, DSP 51 always exports the first brake pulse signal BRK1 with the direction that reduces object lens 34 and CD 10 relative velocity between focus direction to focus driver 56.
When DSP 51 determines the size and the polarity chron of brake pulse BRK1 amplitude by above method, according to the size of the recording layer reflectivity of CD 10, the amplitude A brk of brake pulse BRK1 departs from optimum, to carry out focus servo.In order to prevent this point, always ((dFE/dt)/(PItn) x kr (kr is proportionality constant under the situation of using summing signal RF level) also considers the level PItn of summing signal RF to DSP 51, and sends the best brake pulse of the recording layer reflectivity that does not rely on CD 10 by using Abrk=.
Step 6: focus jump EO
Subsequently, become in the process of positive polarity at the focus error signal FE of negative polarity, when DSP 51 when the time, t6 detected zero crossing, DSP 51 supposition stops focus jumps and handles, and closes focus loop, and is transformed into focus servo control.By focus servo control, object lens 34 Be Controlled (keeping) are in the focus jump position.
Step S7-S8: also after this, the state of DSP 51 monitoring compact disc data recording/reproducing devices, and for example monitor the signal level of summing signal RF.If in disk drive (optical data recording/reproducing device), take place such as judder interference, defocus the big and DSP 51 of quantitative change and detect the expression synchronization at time t7 and introduce the summing signal RF of level state and be lower than level PIoff (S7), DSP 51 just has the second brake pulse BRK2 of amplitude A off to focus driver 56 outputs at time t8, reach precise time Δ toff (S8), mobile object lens 34 leave CD 10 by coaxial actuator 35, prevent object lens 34 bump and damaged compact disks 10 thus, wherein, time t8 and time t7 are much at one.At this moment, focus servo control is by DSP 51 hard closings.
In the above description, make the constant and change amplitude A brk of time Δ tbrk of the first brake pulse BRK1, but also might not change amplitude, but change the output time Δ tbrk of the first brake pulse BRK1.In the present embodiment, the product (momentum) of the output time Δ tbrk of DSP 51 control brake pulse BRK1 and amplitude A brk.
Value (Abrk x Δ tbrk) for momentum, as focus error signal FE become (time t4) when being lower than threshold value FEzc, even amplitude A brk and braking time Δ tbrk change so that proportional with the differential (dFE/dt) of focus error signal, also can obtain effect same as described above.
The modification of first embodiment
Fig. 9 A is the block diagram that is used for the high frequency phase lead compensation wave filter of compensating focusing error signal in DSP shown in Figure 4; Fig. 9 B is the amplitude of the wave filter of high frequency phase lead compensation shown in Fig. 9 A and the frequency characteristic figure of phase place; Fig. 9 C is for (dotted line) under the situation of crossing Fig. 9 A high frequency phase lead compensation wave filter at focusing error (FE) nonpassage of signal with in the oscillogram of focusing error (FE) signal by (solid line) under the situation of high frequency phase lead compensation wave filter; And Fig. 9 D is for (dotted line) under the situation of crossing Fig. 9 A high frequency phase lead compensation wave filter at the brake pulse nonpassage of signal with in the oscillogram of brake pulse signal by (solid line) under the situation of high frequency phase lead compensation wave filter.
In first embodiment, do not pass through the original focus error signal of signal Processing, promptly do not pass through the FEr of phase compensation, be used for judging in step 4 zero crossing of focus error signal FE at time t4, but modification for first embodiment, shown in Fig. 9 A,, just obtain following advantage: reduce focus jump surmounting when focusing on if use the focus error signal FEf that passes through DSP 51 medium-high frequency phase lead compensation wave filters 511.
When original focus error signal FEr that input produces in focus error signal processor 51A, the high frequency phase lead compensation wave filter 511 focus error signal FEfs of output after over-compensation shown in Fig. 9 A, but wave filter 511 has following frequency characteristic: when focusing on introducing, phase place is leading in the frequency field of S-curve, shown in the amplitude-response curve CV1 and phase curve CV2 of Fig. 9 B.By making original focus error signal FEr through high frequency phase lead compensation wave filter 511, it is more Zao with zero time of intersecting than the waveform of the S-curve of original focus error signal FEr shown in Fig. 9 C that the zero crossing time tf of the focus error signal FEf after process high frequency phase lead compensation wave filter becomes.Correspondingly, if DSP 51 is by using the zero crossing judgement of carrying out focus error signal FE through the focus error signal FEf after the high frequency phase lead compensation wave filter, DSP 51 just can be at the moment output brake pulse BRKf more Zao than brake pulse BRKr output time, wherein, brake pulse BRKr represents with the dotted line among Fig. 9 D and brake pulse BRKf represents with solid line, thereby, reduce surmounting after focusing on.Equally in the case, wish to be used to calculate the amplitude of brake pulse BRKf through the differential that has more early focus error signal FEf constantly after the high frequency phase lead compensation wave filter.
Explain above, also may be used among the following embodiment through the focus error signal FEf after the high frequency phase lead compensation wave filter.
In first embodiment, to introduce (focus jump) operation more stable by using in the proportional value of differential of time t4 output and the focus error signal method as the first brake pulse BRK1, focusing on.Especially wish, explain as the modification of first embodiment, detect and the judgement zero crossing at time t4 by using through the focus error signal FEf after the high frequency phase lead compensation wave filter, and, be used to calculate brake pulse BRKf through the differential of the focus error signal FEf after the high frequency phase lead compensation wave filter.
In first embodiment, after focusing on introducing synchronously, when taking place to disturb, defocus and become big, and introduce level synchronously and become that lower (S8 t7), is the second brake pulse BRK2 (S8 of Aoff for Δ toff and amplitude just in time by output time for level PIoff than summing signal RF, t8), can prevent object lens 34 bump CDs 10.
Can know from the explanation of Fig. 8 C and to see that the momentum of the first brake pulse BRK1 is bigger than the momentum of the second brake pulse BRK2, bump against CD 10 to prevent object lens 34.This is because object lens 34 are bigger by the amount of exercise of the second brake pulse BRK2 than object lens 34 by the amount of exercise of the first brake pulse BRK1, and back one motion is used to make object lens 34 to leave a little from CD 10.
Second embodiment
Explain second embodiment of optical data recording/reproducing device of the present invention and method below in conjunction with Figure 10 and Figure 11 A-11C.
Figure 10 is the process flow diagram from control microcomputer 60 shown in Figure 4 processing when DSP 51 finishes focus jump when DSP 51 sends the focus jump initiation command.In Figure 10, step D1-D3 illustrates DSP 51 and drives coaxial actuator 35 moves object lens 34 on focus direction operation by focus driver 56; Step S11-S15 illustrates supervision/determination processing that DSP 51 carries out, and step T1-T4 illustrates the timing processing of timer and DSP 51.
Figure 11 A-11C is focus error signal FE, summing signal RF and focus jump drive signal FJ in the focus jump operation of second embodiment
DrvOscillogram.
In first embodiment, the example of operation is introduced in explanation focusing, wherein, exports the signal that increases with constant gradient as the DSP 51 process focus drivers 56 that focus on drive control component to coaxial actuator 35, as focus jump drive signal FJ
DrvAnd when the bundle spot arrives the target record layer, DSP 51 exports the first brake pulse BRK1 through focus driver 56 to coaxial actuator 35, to stop the motion of object lens 34, but in a second embodiment, shown in Figure 11 C, DSP 51 carries out accelerating step (processing) P1, waiting step (processing) P2 of output acceleration pulse signal ACCE and exports deceleration steps (processing) P3 of the first deceleration pulse signal DECCE to coaxial actuator 35.
According to second embodiment, become and at a high speed and stably to move to the target record layer to the bundle spot from the current record layer.
In the second embodiment of the present invention, DSP 51 shown in Figure 4 always in the time that focus servo loop is closed, promptly in the time of not carrying out the focus jump operation, stick signal FJ in unshowned DSP 51 storeies
DrvThe value Afd_LPF of low-frequency component, wherein, by making focus jump drive signal FJ
DrvPass through low-pass filter (LPF) 55 and picked up signal FJ
DrvLow-frequency component.The value Afd_LPF of low-frequency component is as focus jump drive signal FJ
DrvOff-set value.
As DSP 51 during, handle as the DSP 51 beginning focus jumps of focus jump parts (or focusing on driver part) from control microcomputer 60 collectiong focusing redirect initiation commands.
Step D1: the DSP 51 that focuses on drive control component as the present invention is pre-determined and the amplitude that is stored in the amplitude A acce in the storer of DSP 51 adds the focus jump drive signal FJ that is retained in the storer at the time of Figure 11 C d1 to focus driver 56 its amplitudes of output
DrvThe pulse of value (skew) Afd_LPF of low-frequency component, as acceleration pulse ACCE, be used for by coaxial actuator 35 on focus direction, quickening object lens 34, and, in time Δ tdrv, acceleration pulse ACCE is stored in the storer of DSP 51 (Figure 11 C).Like this, by coaxial actuator 35 object lens 34 being moved with the defined value of momentum of acceleration pulse ACCE on focus direction measures accordingly.
Off-set value Afd_LPF is increased on the amplitude A acce that is stored in the storer, and as acceleration pulse signal ACCE, because if do not increase this off-set value, object lens 34 are accurately motion desired amount not just.
Should point out, present embodiment illustrates the multiplayer optical disk 10 with two recording layers, thereby, single type amplitude A acce pre-determined and that be stored in the storer of DSP 51 is just enough, but, when multiplayer optical disk 10 has three or more recording layers, for the amplitude A acce that is stored in the storer, first amplitude when moving the bundle spot in a recording layer and second amplitude when moving the bundle spot between two recording layers are stored in the storer, and use selectively according to the amount of exercise of object lens 34.
Step D2-D3: after output time reached the acceleration pulse ACCE of Δ tdrv, the focusing driver part among the DSP 51 was exported focus jump drive signal FJ at time d2 continuously to 56 of focus drivers
DrvThe value Afd_LPF of low-frequency component, as the off-set value among the stand-by period Δ twait (D2, Figure 11 C).The focus jump drive signal FJ of off-set value Afd_LPF
DrvIn the stand-by period, export to coaxial actuator 35, because by focus jump drive signal FJ to coaxial actuator 35 these off-set values of effect
Drv, in fact show waiting status.
At time d3, output time just in time is the first deceleration pulse DECCE (D3) of Δ tdrv, and the amplitude of DECCE (Adece-Afd_LPF) obtains by deducting off-set value Afd_LPF from initial amplitude Adece.
Off-set value Afd_LPF is not limited to the value of measuring in the above-mentioned stand-by period.Such as in first embodiment explanation ground, in the focus servo control process, also can use the low-frequency component of the gathering error signal FE of prior measurement.
In DSP 51, if the amplitude A acce of acceleration pulse set be a bit larger tham deceleration pulse amplitude A dece so that the momentum that acceleration pulse ACCE affacts on the object lens 34 become less times greater than the momentum of deceleration pulse DECCE, so, the laser beam (bundle spot) that focuses in the state that the movement velocity of object lens 34 fully descends shines on the target record layer of CD 10, thereby, can stop focus jump, bigger do not surmount and switch to focus servo control and do not produce.
With with focus on identical mode of introducing time, can regulate momentum by the time or the amplitude that change acceleration pulse and deceleration pulse as the DSP51 that focuses on drive control component, perhaps can regulate amplitude and time simultaneously.
Step S11-S14: with in conjunction with the identical mode of the processing of the step S1-S5 that Fig. 7 was explained, object lens 34 were carried out in the cycle of acceleration operation, DSP 51 monitors focus error signal FE and summing signal RF (Figure 11 A and Figure 11 B consistently, time t11-t14), and check from the bundle spot of object lens 34 emissions and whether between the recording layer of CD 10, move reliably, wherein, focus driver 56 and coaxial actuator 35 drive object lens 34 according to acceleration pulse ACCE shown in Figure 11 C and deceleration pulse DECCE from DSP 51 outputs.
More specifically explain these steps below, in step S11, whether DSP 51 becomes bigger than threshold value FEfj at time t11 detection of focus error signal FE.Subsequently, DSP 51 detects following true: at the elapsed time d2 deceleration pulse DECCE shown in the output map 11C afterwards, and summing signal RF becomes minimum value (step S12) at time t12 after acceleration pulse ACCE shown in Figure 11 C finishes.
Step T1-T4 (T1-T4): in the operation of beginning focus jump, activate the timer among the DSP51, check the operation of whether in pre-determined time T fj_limit, carrying out above step S11-S14 as the DSP 51 that focuses on drive control component, and, when operation does not also stop, DSP 51 is to focus driver 56 outputs and the similar brake pulse of the second brake pulse BRK2 shown in Fig. 8 C, make object lens 34 move to such an extent that leave CD 10 by coaxial actuator 35, and then turn back to the focused search pattern.
According to above method, even can write in the multilayer disc in following high density, also might stably between recording layer, move the bundle spot, wherein, in described dish, the interfloor distance of a plurality of recording layers of CD 10 and reference value have deviation or near each recording layer focus error signal are not always obtained constant S-curve.
The 3rd embodiment
Explain optical data recording/reproducing device that is used for focus jump and method below in conjunction with Figure 12 and Figure 13 A-13C as third embodiment of the invention.
Figure 12 for according to the 3rd embodiment till finishing focus jump the time the process flow diagram of processing.
Figure 13 A-13C is the oscillogram of focus error signal FE, summing signal RF and focus jump drive signal FJdr in the operation of the focus jump of the 3rd embodiment.
In Figure 12, in the mode identical with Figure 10, step D1-D4 illustrates that DSP 51 drives coaxial actuators 35 by focus driver 56 and the operation of mobile object lens 34 on focus direction, step S11-S15 illustrates supervision/determination processing of being carried out by DSP 51, and step T1-T4 illustrates timer and handled by the timing that DSP 51 carries out.
The processing of step S11-S14 in third embodiment of the invention shown in Figure 12, step D1-D3 and step T1-T4 is with identical in conjunction with the processing of second embodiment that Figure 10 explained.
The 3rd embodiment is with the difference that combines second embodiment that Figure 10 explains: in the step S14 at Figure 12, DSP 51 judges when intersecting with zero than threshold value (setting value) FEfj_zc is lower because of focus error signal FE becomes, not resembling among second embodiment, DSP 51 closes focus loop immediately to stop the focus jump operation and to be transformed into focus servo control, but increase the processing of step D4 at time t14, in short time Δ tbrk2, export the second deceleration pulse DECCE2 to focus driver 56, drive coaxial actuator 35, and stop the motion of object lens 34, wherein, the differential dFE/dt of the amplitude A brk2=dFE/dt x kfj of the second deceleration pulse DECCE2 and focus error signal FE is proportional.
Subsequently, in step S15, DSP 51 closes focus loop, and is transformed into focus servo control.
Same in the 3rd embodiment, it is identical to use the level of summing signal RF to calculate the situation of the method for amplitude A brk2 of the second deceleration pulse DECCE2 and first embodiment at the time of Figure 13 A t14.At the differential dFE/dt of time t14 focus error signal level PILn divided by summing signal RF.This is on duty with scale-up factor kfj_PI, obtains Abrk2=((dFE/dt)/(PILn) x kfj_PI.By using these, the stable focus jump that might realize not being subjected to the recording layer reflectivity of CD 10 to influence.
The modification of the 3rd embodiment
To in the modification of second embodiment, explain similar, same in the 3rd embodiment, after use focus error signal FEf focuses on, might reduce surmounting of bundle spot on the recording layer that outputs to CD 10, wherein, use 511 couples of focus error signal FE of the high frequency phase lead compensation wave filter shown in Fig. 5 A to use the high frequency phase lead compensation and obtain focus error signal FEf, described compensation is used for zero crossing and judges.
The 4th embodiment
Explain optical data recording/reproducing device and method below in conjunction with Figure 14 to Figure 17 A-17C as fourth embodiment of the invention.
Difference between the fourth embodiment of the present invention and the 3rd embodiment is: the time of sending the first deceleration pulse DECCE1 in the 4th embodiment is different with the 3rd embodiment's.Other similar to the 3rd embodiment.
In the 4th embodiment, must when focusing on each recording layer of CD in advance, the bundle spot determine the level PI of summing signal RF
L1-PI
LnThe level PI of summing signal RF when measurement focuses on each recording layer of CD in advance at the bundle spot
L1-PI
Ln, and be stored in the CD.
Figure 14 is the view of the cross-section structure of the schematically illustrated multiplayer optical disk that is used for the 4th embodiment.
Different with the CD 10 with two recording layers shown in Figure 5, CD 10A shown in Figure 14 has three recording layers, and has the part of the level PIL1-PIL3 of record summing signal RF.
The recording layer sum of this CD 10A and the reflectivity of recording layer 12-14 are recorded in the reading in of first recording layer 14 of CD 10A and distinguish among the RI.The bundle spot at first focuses on first recording layer 14, from this write information, then records in the storer (not shown) in the DSP 51.Level PI as the summing signal RF of first recording layer 14
L1When known, can be from the reflective level PI of the second and the 3rd recording layer 13 and 12
L2-PI
L3Calculate the level PILn=PI of the summing signal RF in the second and the 3rd recording layer 13 and 12
L1X RLn/PI
L1
Figure 15 A is the level PI that is used for explaining the recording layer 12-14 summing signal RF that calculates CD 10A
L1-PI
L3The figure of method, wherein, sending the focus jump drive signal FJ with constant gradient shown in Figure 15 to focus driver 56 from DSP 51
DrvAnd on focus direction, during mobile object lens 34, obtain the level of described summing signal RF continuously by coaxial actuator 35.
Shown in Figure 15 A,, just might determine the level of summing signal RF among the recording layer 12-14 near each recording layer of CD 10A up to the crest number that reads summing signal RF by making object lens 34 if recording layer is total known.
In initial step t00-t01, therefore the maximal value of summing signal RF ignores it less than decision level JL.
After time t0 1, the maximal value of summing signal RF surpasses decision level JL.
With when time t0 2 detects the summing signal of the 3rd recording layer, DSP 51 is to negative focus drive signal BFDRV (the focus drive signal FJ of negative polarity of focus driver 56 outputs
Drv), be used for mobile object lens 34 and leave CD 10A.
In the above description, recording layer sum and reflectivity information are recorded in first recording layer 14 of CD 10A, but they also can be recorded in other the recording layer 12 and 13.
Figure 16 in the fourth embodiment of the present invention from control microcomputer 60 process flow diagram that the focus control when finishing focus jump is handled when DSP 51 sends the focus jump order.In Figure 16, in the mode identical with Figure 12, step D1-D4 illustrates that DSP 51 drives coaxial actuators 35 by focus driver 56 and the operation of mobile object lens 34 on focus direction, step S11-S15 illustrates supervision/determination processing of being carried out by DSP 51, and step T1-T4 illustrates timer and handled by the timing that DSP 51 carries out.
In process flow diagram shown in Figure 16, in process flow diagram shown in Figure 14, increase step 12A.Remaining handles identical with the processing of explaining in conjunction with Figure 12.
Figure 17 A-17C is for focus error signal FE (Figure 17 A) in the operation of the focus jump of the fourth embodiment of the present invention, by the level PI of current summing signal RF divided by the summing signal in the target record layer that will be focused
LK+1And the value (Figure 17 B) and the focus drive signal FJ that obtain
DrvThe oscillogram of (Figure 17 C).
This illustrates following situation: the bundle spot focuses on the k layer of CD 10A, and makes bundle spot focus jump to the (k+1) recording layer.
In step D1, send to focus driver 56 as the DSP 51 that focuses on drive control component and to have amplitude A
AcceWith cycle Δ t
DrvAcceleration pulse ACCE (Figure 17 C, time d1), subsequently, DSP 51 detects time (the step S12 that summing signal RF expresses minimum value, the time t12 of Figure 17 B), then, when DSP 51 detect by the current summing signal RF shown in Figure 17 B divided by CD 10A in the level PI of summing signal RF in the target record layer of illuminated bundle spot
LK+1And the value that obtains is when surpassing threshold value PIRatio (step S12A, Figure 17 B, time t12a), and DSP 51 is to the focus driver 56 output first deceleration pulse DECCE1 (Figure 17 C, time d2).
FE is different with focus error signal, the influence of the level tolerable aberration of summing signal RF, thus between the video disc recording layer, in the CD of variable in distance, when focus jump, can stablize the focus jump operation by the level that uses this summing signal RF.Should point out, if must find the level of the summing signal RF of each recording layer of CD in advance, it is complicated that program just becomes, and the form of restriction CD, thereby DSP 51 produces the first deceleration pulse DECCE1 when the level at current summing signal RF reaches certain threshold value, and the level at current summing signal RF is minimum value (Figure 17 B, time t12) DSP 51 produces the first deceleration pulse DECCE1 time, at this moment, obtains effect same as described above.
Other modification
Optical data recording/reproducing device of the present invention and method are not limited to above embodiment.
For example, they not only can be realized by DSP 51, also can realize by various circuit devcies or computing machine and software, as long as they have the processing capacity of DSP 51, more than DSP 51 is made an explanation as the embodiment of the focus jump processing element of the embodiment of the invention shown in Figure 4.
In above embodiment, the explanation optical data recording/reproducing device disposes identically with configuration shown in Figure 4 and has only the different situation of contents processing of DSP 51.Correspondingly, more than using during each embodiment, the contents processing difference of DSP 51.
In above embodiment, explanation is handled by DSP 51 needs the processing that high-speed real-time handles and the bulk treatment of optical data recording/reproducing device is transferred to the example that control microcomputer 60 is handled, but, can suitably change the division of the contents processing of control microcomputer 60 and DSP 51.
And then, also might realize the contents processing of DSP 51 by hardware circuit, handle as the phase compensation of explaining in conjunction with Fig. 6.
According to the present invention, even using high density can write in the optical data recording/reproducing device of multiplayer optical disk, the stable motion of bundle spot between recording layer also becomes possible.
In the present invention, become the technology of the value of ratio with the differential of focus error signal, also might stablize to focus on and introduce operation as brake pulse by using to focus driver output.
Industrial applicability
Optical data recording/reproducing device of the present invention can be used as the record dress in each industrial circle Put.
Claims (1)
1. optical data recording/reproducing device with focus actuator (35), this focus actuator (35) is used for carrying out with recoding/reproduction operates corresponding focus jump operation, described focus jump operation is used to make laser beam spot to move between a plurality of recording layers of the multiplayer optical disk with a plurality of recording layers, the operation of described recoding/reproduction is used at described multiplayer optical disk identifying recording layer or is used to reproduce the data of record, and described optical data recording/reproducing device comprises:
Optical pickup apparatus (30), optical pickup apparatus has object lens (34), on focus direction mobile object lens focus actuator (35), be used to launch light beam beam emissions parts (42), be used to receive the light-receiving member (32) and the optical system (33) of the light that returns from described CD, described optical system is used for the light beam from described beam emissions parts is directed to described object lens and a back light that incides on the described object lens from described CD is directed to described light-receiving member;
Focus error signal production part (51A) is based on from the signal of described light-receiving member (32) and produce focus error signal (FE);
Summing signal production part (51B) is based on from the signal of described light-receiving member (32) and produce summing signal (RF); And
Focus on drive control component (51);
Wherein said focusing drive control component (51) is carried out following action:
To described focus actuator (35) output acceleration pulse signal (ACCE), so that described object lens (34) move on focus direction, handle navigates to the target localization recording layer of described multiplayer optical disk when applying focus jump commencing signal and target localization recording layer signal with box lunch from the bundle spot of described object lens (34)
Waited for for first stand-by period,
When waiting for described first stand-by period during the currency of the current summing signal (RF) that produces from the back light of described CD express minimum value (MIN), and then value (RF/PI by described current summing signal (RF) is obtained divided by the reflectivity information by the specified recording layer of target localization recording layer signal
LK+1) when surpassing threshold value (PIRatio), export the mobile first deceleration pulse signal (DECCE1) that slows down that is used for described object lens (34) to described focus actuator (35), wherein, target localization recording layer signal record is in the recording layer of described multiplayer optical disk
Waited for for second stand-by period, and
When waiting for described second stand-by period during the absolute value representation of the described focus error signal (FE) that produces from the back light of described CD go out maximal value and when then intersecting, be used to stop second deceleration pulse (DECCE2) that moves of described object lens (34) to described focus actuator (35) output with zero.
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| CNB2005100966588A Expired - Fee Related CN100353431C (en) | 2001-07-26 | 2002-07-26 | Optical recording/reproducing apparatus, focusing method therefor, and optical disk recording medium |
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| JP5176723B2 (en) * | 2008-07-01 | 2013-04-03 | ソニー株式会社 | Driving apparatus and method, program, and recording medium |
| CN102175376B (en) * | 2011-01-27 | 2012-06-27 | 哈尔滨工业大学 | Multi-laser-beam heterodyne micro-impulse-measuring device and method |
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|---|---|---|---|---|
| US5255262A (en) * | 1991-06-04 | 1993-10-19 | International Business Machines Corporation | Multiple data surface optical data storage system with transmissive data surfaces |
| JPH08147762A (en) * | 1994-11-16 | 1996-06-07 | Sony Corp | Optical disk and its reproducing device |
| JP3726621B2 (en) * | 2000-02-25 | 2005-12-14 | 三菱電機株式会社 | Focus pull-in method and optical disk apparatus |
-
2002
- 2002-07-26 CN CN2005100966605A patent/CN100407301C/en not_active Expired - Fee Related
- 2002-07-26 CN CNB2005100966588A patent/CN100353431C/en not_active Expired - Fee Related
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1151579A (en) * | 1995-08-04 | 1997-06-11 | 索尼公司 | Disk driving device and method for optical recording and reproduction |
| JP2000155955A (en) * | 1998-11-18 | 2000-06-06 | Matsushita Electric Ind Co Ltd | Focus jump control method and optical disk apparatus |
| JP2000298846A (en) * | 1999-04-09 | 2000-10-24 | Sony Corp | Optical disk drive apparatus and method for focus jump thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1770280A (en) | 2006-05-10 |
| CN100350471C (en) | 2007-11-21 |
| CN100353431C (en) | 2007-12-05 |
| CN1770279A (en) | 2006-05-10 |
| CN1776814A (en) | 2006-05-24 |
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