CN100395830C - Playback apparatus and layer jump method - Google Patents
Playback apparatus and layer jump method Download PDFInfo
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- CN100395830C CN100395830C CNB2006100581039A CN200610058103A CN100395830C CN 100395830 C CN100395830 C CN 100395830C CN B2006100581039 A CNB2006100581039 A CN B2006100581039A CN 200610058103 A CN200610058103 A CN 200610058103A CN 100395830 C CN100395830 C CN 100395830C
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Abstract
A playback apparatus that plays back a recording medium having recording layers includes an optical head irradiating the recording layers with laser light using an objective lens and reading information recorded in the recording layers; an actuator holding the objective lens; focus servo means for driving the actuator to execute focus servo; layer movement driving means for driving the actuator to perform movement of the objective lens in an interlayer direction; tracking servo means for driving the actuator to execute tracking servo; center-point servo means for driving the actuator to execute center-point servo for setting the objective lens to a center point position; and layer jump sequence control means for performing a series of layer jump operations and causing the center-point servo means to execute the center-point servo in a predetermined time within a period during which the series of layer jump operations is performed.
Description
Technical field
The present invention relates to playback reproducer and layer jump method, be used to have the recording medium of a plurality of recording layers, for example CD.
Background technology
CD be well-known can be with information optics record thereon or from the optical record medium of its playback of information.For example, developed dish based on various standards, for example CD (compact disk, C D), digital versatile disc (digital Versatile disc, DVD) and Blu-ray disc (Blu-Ray, registered trademark).
By using from laser as the semiconductor laser of light source etc., utilize the collected small light beam irradiates CD of scioptics, write down or playback of information.As everyone knows, in order to keep the recording layer of laser focusing, carry out focus servo operation at CD.By the object lens that the double-shaft mechanism (dual-axis actuator) in the optical head (optical head) kept according to focus error signal towards with away from dish, promptly carry out focus servo operation along focus direction.
In recent years, developed have a plurality of recording layers dish as CD, for example have two-layer or more multi-layered multilayer disc.For these multilayer disc, the recording/playback that moves to another recording layer for the recording/playback operation from a recording layer is operated, and carries out skip floor.For example, in order to move to the state of the second layer being opened focus servo from the state of ground floor being opened focus servo, the skip floor of carrying out object lens moves.
" skip floor (layer jump) " is the move operation of position between recording layer of laser focused, is also referred to as " jumping burnt (focus jump) ".
Open the technology that discloses in the flat 11-191222 communique about the operation that is called as " jumping burnt " or " skip floor " TOHKEMY 2002-269770,2001-319344,2002-279654 and spy.
Keep the dual-axis actuator of object lens to support object lens, make that object lens can moving radially along dish.When object lens are controlled at dish radially (that is, follow the mark direction) time, carry out the tracking servo operation, so that the recording track on the Laser Tracking dish.
In addition, known a kind of technology that is called as the mid point servo operation, in this mid point servo operation, dual-axis actuator remains on object lens the point midway radially of dish.For example, for along dish move radially optical head, by carrying out the mid point servo operation, object lens are maintained point midway, promptly object lens can be in the center of the scope of the radial oscillation of dish.
Technology about the mid point servo operation has been described in Japanese kokai publication hei 11-98759 and the flat 7-93764 communique of Te Kai.
Summary of the invention
Need to reduce skip floor and handle the required time, the stability that also needs skip floor to handle.
Usually, in order to carry out the skip floor from a recording layer to another recording layer, under tracking servo and the pent state of focus servo, object lens are promptly driven along focus direction along the interlayer direction, and are moved near the position, position in focus of target record layer.During near object lens being moved to position in focus position, focus servo is opened obtaining state in focus, and tracking servo also is opened.Thus, finish skip floor and handle, and can executive logging to the destination recording layer of beating/from the destination recording layer playback of beating.
Yet, in known technology, owing to during skip floor is handled, the tracking coil sides of dual-axis actuator is not controlled, therefore, for example for the dish that has large eccentricity before beating in recording layer, when closing tracking servo before skip floor, object lens follow mark direction thermal agitation.Thereby along the deleterious effect of focus direction generation cross action (cross action), and this makes skip floor handle instability.In addition, to jump to the performance of tracking servo capture operation of recording layer worsened.
In addition, jump to recording layer in eccentric big situation under combine with the increase of the speed that is caused owing to off-centre because actuator follows the increase of the speed that the vibration of mark direction causes.Thereby, in this case, significantly reduced the stability of tracking servo capture operation.
In other words, although at skip floor handled beginning front opening focus servo and tracking servo, owing to during skip floor is handled, do not obtain normal tracking error signal, thereby the instantaneous tracking servo (servo with slip) of closing beating before.In this case, owing under the state of the off-centre of following dish by the object lens that dual-axis actuator kept, close tracking servo suddenly, therefore, off-centre as fruit tray is very big, if perhaps because the off-centre that clamping caused is very big, then follow under the situation that the mark direction moves with very high speed at object lens, tracking servo control is cancelled.Consequently, object lens temporarily vibrate with the resonant frequency f0 of dual-axis actuator.
Handle owing to when object lens vibrate, carry out skip floor, thereby make the tracking servo capture operation instability that is right after after the operation of beating.
In order to address the above problem, can adopt following measure: after beating, wait for up to vibrational stabilization that object lens follow the mark direction to a certain degree after, enter the tracking servo capture operation again.Yet, owing to need wait to follow the stable of mark direction, thereby increased the skip floor processing time inevitably.
In other words and since wait for up to dual-axis actuator follow the oscillation level of mark direction stable after, just carry out the tracking servo capture operation, thereby stablized capture operation self.Yet, when off-centre is big, as mentioned above, significantly increased up to reaching the stable stand-by period.
Wish to realize the stability that skip floor is handled and reduce the required time of skip floor processing.
Playback reproducer according to the embodiment of the invention is used for the recording medium that playback has a plurality of recording layers, it comprises: optical head, it uses object lens to utilize these a plurality of recording layers of laser radiation as output terminal, the reflective information of detection laser, and the information of reading and recording in these a plurality of recording layers; Actuator, it keeps object lens, so that object lens can move along focus direction and tracking direction; Focus servo apparatus is used for basis from the focus error signal that the reflective information that optical head read obtains, and comes driving actuator to carry out focus servo; Layer mobile drive deivce is used to produce the skip floor drive signal that is used for the position of object lens is moved to from the position in focus of a recording layer position in focus of another recording layer, carries out object lens moving along the interlayer direction with driving actuator; The tracking servo device is used for basis from the tracking error signal that the reflective information that optical head read obtains, and comes driving actuator to carry out tracking servo; The mid point servomechanism installation is used for according to departing from the mid point error signal of the error signal of its point midway on the tracking direction as object lens, comes driving actuator servo with the mid point that execution is used for object lens are set to point midway; And skip floor sequence control device, be used to carry out a series of skip floor operations, and carrying out the predetermined amount of time of this a series of skip floor in operating period, it is servo to make the mid point servomechanism installation carry out mid point, wherein this a series of skip floors operation comprises and makes the tracking servo device close tracking servo, make focus servo apparatus close focus servo so that layer mobile drive deivce carried out object lens along the moving of interlayer direction, make focus servo apparatus open focus servo, and make the tracking servo device open tracking servo.
The skip floor sequence control device makes the mid point servomechanism installation carry out this a series of skip floor in operating period, makes object lens begin predetermined amount of time before the moving of interlayer direction at layer mobile drive deivce, and the execution mid point is servo.
The skip floor sequence control device makes the mid point servomechanism installation carry out this a series of skip floor in operating period, makes object lens finish predetermined amount of time after the moving of interlayer direction at layer mobile drive deivce, and the execution mid point is servo.
The skip floor sequence control device makes the mid point servomechanism installation carry out this a series of skip floor in operating period, carries out making object lens during the moving of interlayer direction at layer mobile drive deivce, and the execution mid point is servo.
Layer jump method according to the embodiment of the invention may further comprise the steps: close tracking servo; Close focus servo to carry out object lens moving along the interlayer direction; Open focus servo; Open tracking servo; And at the predetermined amount of time of skip floor in operating period of carrying out from the step of closing tracking servo to the step of opening tracking servo, it is servo to carry out the mid point that is used for object lens are set to the point midway on the tracking direction.
From the step of closing tracking servo to close focus servo with carry out object lens during the step that moves of interlayer direction in, carry out the servo step of mid point and be performed.
During from the step of opening focus servo to the step of opening tracking servo, carry out the servo step of mid point and be performed.
Carry out along the interlayer direction move during in, carry out the servo step of mid point and be performed.
In other words, comprise close tracking servo, close focus servo, interlayer moves, move the back by the focus servo capture operation opening focus servo control and carry out and in by a series of skip floors operations of opening the tracking servo capture operation that tracking servo control carries out at interlayer, in the certain hour section, mid point is servo to be opened, and the fast and stable object lens follow the vibration of mark direction under the servo control of mid point.In other words because by the mid point servo-stabilization when closing tracking servo because the vibration of the object lens (actuator) that the influence of off-centre etc. causes, thereby can reduce stand-by period up to vibrational stabilization.
Move in preceding, the interlayer moving process or after interlayer moved, it was servo to open mid point at interlayer.Alternatively, before interlayer moves and after interlayer moves, interlayer moves before and during interlayer moves, after in interlayer moves, moving with interlayer, interlayer move preceding, interlayer move in and after interlayer moves, it is servo to open mid point.
Therefore, when a series of skip floors of execution were operated, it was servo to open mid point within a certain period of time.Under the servo control of mid point, make object lens (actuator that keeps object lens) follow the vibrational stabilization of mark direction, and in the shorter time, reach stable.Therefore, reduced and stablized the required time.Therefore, can realize the stability of this a series of skip floors operation and reduce this a series of required times of skip floors operation.
Move the vibration of the servo quick forward position tracking direction that suppressed to beat of beginning front opening mid point at interlayer.Thereby, can reduce the stand-by period of moving beginning (up to vibrational stabilization) up to interlayer.In addition owing to before beating, suppressed to follow the vibration of mark direction, thereby during can suppressing to beat as influence along the big vibration that follows the mark direction of the cross action of focus direction, and the operation in the moving process between can resistant strata.And when carrying out the tracking servo capture operation in the back of beating, the influence of the off-centre of the anterior layer of beating does not occur, and can stablize and carry out the tracking servo capture operation apace.
After moving, opens interlayer the servo quick vibration that follows the mark direction after having suppressed to beat of mid point.Thereby, the tracking servo capture operation can be stablized, and time and required time of capture operation can be reduced up to capture operation begins.
During moving, opens interlayer the servo vibration that has suppressed to follow during interlayer moves the mark direction of mid point, the influence that has suppressed to cause along focus direction by cross action, and stablized operation during interlayer moves.In addition, when carrying out the tracking servo capture operation in the back of beating, the influence of the off-centre of the anterior layer of beating does not occur, and can stablize and carry out the tracking servo capture operation apace.
Description of drawings
Fig. 1 is the block diagram that illustrates according to first configuration example of the disk drive device of the embodiment of the invention;
Fig. 2 is the block diagram that illustrates according to the structure of the focus servosystem of this embodiment and tracking servo system;
Fig. 3 is the key diagram that illustrates according to the configuration example of the spherical aberration correction of this embodiment;
Fig. 4 A and 4B are the key diagrams that illustrates according to another configuration example of the spherical aberration correction of this embodiment;
Fig. 5 is the key diagram of structure that is used to produce the mid point error signal that illustrates according to this embodiment;
Fig. 6 is the block diagram that illustrates according to second configuration example of the disk drive device of this embodiment;
Fig. 7 is the key diagram of structure that is used to produce the mid point error signal that illustrates according to this embodiment;
Fig. 8 is the key diagram that dual layer discs is shown;
Fig. 9 is the key diagram that the skip floor operation is shown;
Figure 10 is the process flow diagram that first example of handling according to the skip floor of this embodiment is shown;
Figure 11 is the process flow diagram that second example handling according to the skip floor of this embodiment is shown;
Figure 12 is the process flow diagram that the 3rd example of handling according to the skip floor of this embodiment is shown;
Figure 13 A is the key diagram that is illustrated in stabilization time in the known example; And
Figure 13 B is the key diagram that is shown stabilization time among this embodiment.
Embodiment
Will be to as describing according to the disk drive device of the example of the playback reproducer of the embodiment of the invention and the layer jump method of carrying out by this disk drive device.To the configuration example according to the disk drive device of present embodiment be described as first and second configuration example.First, second that to handle as skip floor the example of the skip floor series processing carried out in first or second configuration example and the 3rd example describe.
Fig. 1 illustrates first configuration example according to the disk drive device of this embodiment.
To coil 1 and be placed on (not shown) on the turntable.In the recording/playback operation, Spindle Motor 2 is with constant linear velocity (CLV) or constant angular velocity (CAV) rotation and driving-disc 1.Reading hole (pit), pigment as impression (embossed) as the pick-up (pickup) 3 of the optical head that is used for recording/playback changes hole, phase transformation hole etc. and is recorded in the data of coiling on 1, and be formed on address pre-groove (address in pregroove, ADIP) information in the dish by wobble groove.
Pick-up 3 comprises: laser diode 3a, as lasing light emitter; Photodetector 3b is used for detection of reflected light; Dual-axis actuator 3c, it keeps the object lens as laser output; Automated power control (APC) circuit 3d, its control is from the laser of laser diode 3a output; And the optical system (not shown), it utilizes the laser radiation dish record surface through object lens, and reflected light is directed to photodetector 3b.In addition, the 3e of expansion lens mechanism that is used as spherical aberration correction mechanism is set in the laser optical path that forms by optical system.
Dual-axis actuator 3c keeps object lens, makes object lens can follow the mark direction and focus direction moves.Can use three shaft actuators, this three shaft actuator can be along inclined direction, i.e. optical axis and coil vergence direction between 1, and follow the mark direction and focus direction is carried out control.
In addition, slider 4 allows whole pick-up 3 moving radially along dish.
Detect reflective information by photodetector 3b, and provide it to analogue signal processor 8 from dish 1, as with the corresponding electric signal of the light quantity that receives.
In analogue signal processor 8, matrix amplifier 8a carries out matrix operation to the signal in the light receiving part of photodetector 3b.Matrix amplifier 8a produces, and for example, is used for servo-controlled focus error signal FE, tracking error signal TE and mid point error signal CE.Matrix amplifier 8a also produces as pushing away/draw signal P/P about the information of wobble groove.
In addition, in analogue signal processor 8, read channel front end 8b execution Filtering Processing and gain process to produce playback RF signal.
In analog to digital (A/D) converter 12 with RF signal, focus error signal FE, tracking error signal TE, mid point error signal CE and push away/draw among the signal P/P each convert digital signal to, and be entered into digital signal processor 9.
Digital signal processor 9 comprises and writes pulse producer 9a, servo signal processor 9b, RF signal processor 9c, wobble signal processor 9d and expansion control signal processor 9e.
What decoding was produced and be converted into digital signal in A/D converter 12 by matrix amplifier 8a in wobble signal processor 9d pushes away/draws signal P/P, and extracts ADIP information.By disk controller 14 address that obtained and physical format information etc. are offered CPU 15 as ADIP information.
Servo signal processor 9b is from the focus error signal FE, the tracking error signal TE that are imported, mid point error signal CE and for example by the detected rotating speed datas such as PLL processing the RF signal processor 9c, produce be used for focus servo, tracking servo, mid point is servo, slip is servo and the various servo drive signals of main axle servo, and make to carry out servo operation.
To be used for corresponding servo servo drive signal by digital-to-analog (D/A) converter 16 and offer servo-driver circuit 5.Servo-driver circuit 5 drives dual-axis actuator 3c, and makes and carry out as the servo operation of focus servo, tracking servo and mid point according to being used for the servo servo drive signal of focus servo, tracking servo and mid point.
In addition, servo-driver circuit 5 drives slider 4 according to the slip servo drive signal, and makes slider 4 move pick-up 3.Servo-driver circuit 5 is also according to rotation of main axle servo drive signal and drive shaft motor 2.
In addition, servo signal processor 9b offers servo-driver circuit 5 with in the above-mentioned signal each, so that according to the operation of carrying out for example focused search, skip floor from the instruction of CPU 15, jumping onto the tracks and seek rail.
By RF signal processor 9c come digital processing that channel front end 8b produces by reading, in A/D converter 12, be converted into the RF signal of digital signal, and provide it to disk controller 14.
Disk controller 14 comprises encoder/decoder 14a, ECC processor 14b and host interface 14c.
In disk controller 14, in playback process, the data that encoder/decoder 14a decoding provides from RF signal processor 9c, ECC processor 14b carries out correction processing.Therefore, obtain playback of data.
In addition, disk controller 14 is from by extracting subcode information, address information, management information and additional information the information that decoding processing obtained, and these information are offered CPU15.
Under control, playback of data is sent to external host device 100 (for example, personal computer) from host interface 14c as the CPU 15 of the controller of disk drive device.
In other words, CPU 15 uses playback of data and read/write command to wait to carry out and the communicating by letter of host apparatus 100 by host interface 14c.The playback process of CPU 15 console panels 1, and transmit decoded playback of data according to reading order from host apparatus 100.
In addition, by write command and the record data from host apparatus 100 are provided, CPU 15 makes and is carried out coiling 1 recording operation.
In addition, CPU 15 offers digital signal processor 9 to carry out servo operation and signal processing operations etc. with various instructions.
In addition, CPU 15 uses internal sensor identification dish 1 to be inserted into and to coil 1 and (card) is installed reliably on Spindle Motor 2.
In the processing of record data, ECC processor 14b adds error-correcting code to provide from host apparatus 100 record data, and encoder/decoder 14a encoded packets contains the record data of the error-correcting code of adding to some extent.
Write pulse producer 9a with what the record data behind the coding offered digital signal processor 9.Write pulse producer 9a the record data after encoding are carried out waveform shaping, and the data after will handling offer APC circuit 3d as the Laser Modulation data.
APC circuit 3d is according to Laser Modulation data-driven laser diode 3a, and makes laser diode 3a output and the corresponding laser of these record data.Thereby, data are write in the dish 1.
As fruit tray 1 is the rewritable disk with phase change recording layers, then changes the crystal structure of recording layer according to the heating of using laser, and forms the phase transformation hole.In other words, by existing and not having the length of selecting between the hole and passing through to change the hole, write down various data.In addition, when laser was applied to the part that has formed the hole once more, by heating, reformed crystal structure returned to virgin state during with record data, and came deleted data by the disappearance in hole.
Expansion control signal processor 9e drives and controls the 3e of expansion lens mechanism as spherical aberration correction mechanism according to the instruction from CPU 15, and makes the 3e of expansion lens mechanism carry out the corresponding spherical aberration adjustment of recording layer with dish 1.
To offer extended driver circuit 18 from the control signal of expansion control signal processor 9e by D/A converter 17.Extended driver circuit 18 drives the expansion lens 3e of mechanism, and makes the 3e of expansion lens mechanism carry out the spherical aberration adjustment.
Then the structure with reference to 2 couples of servo signal processor 9b of figure describes.As mentioned above, although servo signal processor 9b execution is used for focus servo, tracking servo, mid point is servo, slip is servo and the signal Processing of the servo operation of main axle servo, and focus control system and TCS only are shown in Fig. 2.In other words, the signal processing system of dual-axis actuator 3c only is shown in Fig. 2.
The focus control system has the structure that is used to carry out focus servo control, focused search and skip floor.Thereby servo signal processor 9b comprises focus servo arithmetic element 52, focused search signal generator 53, skip floor signal generator 54 and switch unit 59.
TCS has and is used to carry out tracking servo control and the servo-controlled structure of mid point.Thereby servo signal processor 9b comprises tracking servo arithmetic element 55, the servo arithmetic element 56 of mid point and switch unit 60.
With reference to figure 2, servo controller 51 is according to the signal Processing that is used for focus control system and TCS from the instruction control of CPU 15, and the switching of control switch unit 59 and 60.Especially, handle for the skip floor as the feature of present embodiment, servo controller 51 is carried out the sequence control that is used for the skip floor operation, and servo controller 51 is as the skip floor sequence controller.
The focus error signal FE that provides from the A/D converter shown in Fig. 1 12 is imported into focus servo arithmetic element 52.
The focus error signal FE that 52 pairs of focus servo arithmetic elements are used for phase compensation carries out Filtering Processing and loop gain processing etc., and produces focus servo signal.
In order to open focus servo loop, servo controller 51 is connected to terminal TFS with switch unit 59.In this case, by the focusing D/A converter 16a in the D/A converter 16, will offer the focus driver 5a in the servo-driver circuit 5 by the focus servo signal that focus servo arithmetic element 52 generates according to focus error signal FE.The focusing coil of dual-axis actuator 3c is provided electric current according to the focus servo signal that is provided focus driver 5a.Thereby, carry out the focus servo operation of the state in focus be used to keep recording layer.
Focused search signal generator 53 produces and output focused search drive signal, is used for forcing to drive object lens, makes that carrying out focus servo catches (pull-in) operation.
For focused search, switch unit 59 is connected to terminal TSC and closes under the situation of focus servo at servo controller 51, will offer focus driver 5a by the focused search drive signal that focused search signal generator 53 produces by focusing on D/A converter 16a.When focus driver 5a will offer the focusing coil of dual-axis actuator 3c with the corresponding drive current of focused search drive signal, mobile object lens were to search for.When the zero passage of the S of focus error signal shape waveform switches to switch unit 59 terminal TFS and opens focus servo near regularly, execution focus servo capture operation.
Skip floor signal generator 54 produces and output skip floor drive signal.As the back with reference to as described in the figure 9, kick (kick) pulse and braking (brake) pulse that skip floor signal generator 54 produces as the skip floor drive signal.
For skip floor, will switch 59 at servo controller 51 and be connected to terminal TLJ and close under the situation of focus servo, will offer focus driver 5a by the skip floor drive signal that skip floor signal generator 54 is produced by focusing on D/A converter 16a.
When focus driver 5a will offer the focusing coil of dual-axis actuator 3c with the corresponding drive current of skip floor drive signal, object lens were jumped and are moved.When beating the back when the zero passage of the S of focus error signal shape waveform switches to switch unit 59 terminal TFS and opens focus servo near regularly, the execution focus servo capture operation in the recording layer of destination of beating.
The tracking error signal TE that provides from the A/D converter shown in Fig. 1 12 is imported into tracking servo arithmetic element 55.
The tracking error signal TE that 55 pairs of tracking servo arithmetic elements are used for phase compensation carries out Filtering Processing and loop gain processing etc., and produces the tracking servo signal.
In order to open tracking servo, servo controller 51 is connected to terminal TTS with switch unit 60.In this case, by the tracking D/A converter 16b in the D/A converter 16, will offer the tracking driver 5b in the servo-driver circuit 5 by the tracking servo signal that tracking servo arithmetic element 55 produces according to tracking error signal TE.The tracking coil of dual-axis actuator 3c is provided electric current according to the tracking servo signal that is provided tracking driver 5b.Thereby, carry out the recording track that is used to keep on the recording layer and operated by the tracking servo of the state of Laser Tracking.
The mid point error signal CE that provides from the A/D converter shown in Fig. 1 12 is imported into the servo arithmetic element 56 of mid point.
The mid point error signal CE that 56 pairs of the servo arithmetic elements of mid point are used for phase compensation carries out Filtering Processing and loop gain processing etc., and produces the mid point servosignal.
Mid point is servo to control to point midway among the dual-axis actuator 3c with object lens.Servo in order to open mid point, servo controller 51 is connected to terminal TCS with switch unit 60.In this case, close tracking servo, and will offer tracking driver 5b according to the mid point servosignal that mid point error signal CE is produced by the servo arithmetic element 56 of mid point by tracking D/A converter 16b.The tracking coil of dual-axis actuator 3c is provided electric current according to the mid point servosignal that is provided tracking driver 5b.Thereby carry out the mid point servo operation that is used for the location dimension of object lens is held in mid point.
The operation of servo controller 51 control focus servo arithmetic elements 52, focused search signal generator 53, skip floor signal generator 54, tracking servo arithmetic element 55 and the servo arithmetic element 56 of mid point.
In addition, servo controller 51 is carried out the switching controls of switch unit 59 and 60.
When servo controller 51 made switch unit 59 be connected to terminal TFOFF, the operation of focusing system was closed.When servo controller 51 made switch unit 60 be connected to terminal TTOFF, tracking servo and mid point are servo, and both were closed.
In addition, in order to carry out the sequence control to skip floor processing etc., servo controller 51 monitors focus error signal FE and mid point error signal CE.
According to structure shown in Figure 2, focus servo arithmetic element 52, focusing D/A converter 16a and focus driver 5a are as the focus servo part.Skip floor signal generator 54, focusing D/A converter 16a and focus driver 5a are as the mobile drive part of layer.
Tracking servo arithmetic element 55, tracking D/A converter 16b and tracking driver 5b are as the tracking servo part.The servo arithmetic element 56 of mid point, tracking D/A converter 16b and tracking driver 5b are as the mid point servo segment.
Then the optical system in the pick-up 3 and the example of structure of spherical aberration adjusting mechanism are described with reference to figure 3.
With reference to figure 3, will convert parallel beam to from the laser of laser diode 3a output by collimation lens 82.Parallel beam passes through beam splitter (beam splitter) 83, and enters into object lens 84 through removable lens 87 and fixed lens 88, and removable lens 87 and fixed lens 88 are the correcting lenses that are used for the 3e of expansion lens mechanism of spherical aberration adjustment.Light beam is irradiated to dish 1 from object lens 84.In the 3e of expansion lens mechanism, spherical aberration is adjusted actuator 89 and is driven removable lens 87 to carry out the spherical aberration adjustment.
Reflected light from dish 1 enters into beam splitter 83 through object lens 84, fixed lens 88 and removable lens 87.Reflected light from dish 1 is reflected by beam splitter 83, and incides photodetector 3b by collector lens 85.
In above-mentioned optical system, object lens 84 are supported by dual-axis actuator 3c, are made object lens 84 to move along focus direction and tracking direction, and can carry out focus servo operation and tracking servo operation etc., as mentioned above.
In addition, the 3e of expansion lens mechanism has the function of the diameter that changes laser.That is to say that spherical aberration is adjusted actuator 89 and allowed removable lens 87 to move along the J direction as optical axis direction.According to moving of removable lens 87, adjust the diameter that is applied to the laser on the dish 1.
In other words, adjust actuator 89 when moving around removable lens 87 along optical axis direction, can carry out the spherical aberration adjustment when extended driver circuit 18 shown in Figure 1 offers spherical aberration with drive signal.For example, corresponding recording layer is carried out the spherical aberration adjustment.For example, for dual layer discs, the amount of movement that moves removable lens 87 in order to carry out skip floor between first recording layer and second recording layer is set.Expansion control signal processor 9e output control signal makes removable lens 87 move set amount of movement.
Can use liquid crystal panel to carry out the spherical aberration adjustment.Fig. 4 A illustrates following situation, and the optical system similar to the optical system among Fig. 3 comprises liquid crystal panel 3g but not the 3e of expansion lens mechanism.
In other words, in liquid crystal panel 3g, by change laser the border between the zone of the zone of process and intercepting laser, shown in the line that the solid line among Fig. 4 B, dotted line and dashed line replace, can change the diameter of laser.
In other words, in this case,, provide liquid crystal panel 3g and liquid crystal driver circuit 18A according to structure shown in Figure 1, but not 3e of expansion lens mechanism and extended driver circuit 18.In addition, digital signal processor 9 comprises liquid crystal control signal processor, but not expansion control signal processor 9e.When liquid crystal control signal processor outputs to control signal the liquid crystal driver circuit 18A that is used to drive liquid crystal panel 3g when changing regional transmission, can carry out spherical aberration correction.
Then illustrate that with reference to figure 5 being used in the structure shown in Figure 1 produces the example of structure of mid point error signal CE.
Fig. 5 illustrates light receiving surface A, B, C, D, E, F, G and the H as photodetector 3b, and as the circuit of the computing circuit in the matrix amplifier 8a that is used to produce tracking error signal TE and mid point error signal CE.
Light receiving surface A, B, C and D are four fens (four-divided) light receiving surfaces, are used for the reflected light of detection laser main beam.Light receiving surface E and F are two fens light receiving surfaces, be used to detect be applied to along dish radially from the be shifted reflected light of lateral bundle of position of half track of main beam.Similarly, light receiving surface G and H are two fens light receiving surfaces, be used to detect be applied to along light radially from the be shifted reflected light of lateral bundle of position of half track of main beam.
The detection signal of 72 couples of light receiving surface A of totalizer and C carries out addition, and totalizer 73 is carried out addition with the detection signal of light receiving surface B and D.Subtracter 74 deducts the output of totalizer 72 from the output of totalizer 73.In other words, draw signal MPP from the output " (B+D)-(A+C) " of subtracter 74 as promoting mainly.
On the contrary, subtracter 79 is drawn signal MPP and is deducted the thruster that is multiplied by COEFFICIENT K multiplier 77 and draw signal SPP from promoting mainly, the output of subtracter 79, i.e. and " MPP-K * SPP " is as mid point error signal CE.
This mid point error signal CE is used as the information of the error of the point midway that departs from the object lens 84 among the dual-axis actuator 3c, and is provided for the servo arithmetic element 56 of mid point of servo signal processor 9b.
Then second configuration example according to the disk drive device of present embodiment is described with reference to figure 6.Second configuration example, first configuration example with shown in Figure 1 basically is identical.Use identical Reference numeral to represent the part identical, and no longer repeat the explanation of these same sections at this with first configuration example.
In this example, point sensor in the use, rather than use from the reflected light that coils 1, obtain mid point error signal CE.Thereby pick-up 3 comprises mid point error signal generator 3f, and this mid point error signal generator 3f comprises middle point sensor, and produces mid point error signal CE.To offer servo signal processor 9b by the mid point error signal CE that mid point error signal generator 3f produces by A/D converter 12.
The structure of mid point error signal generator 3f then is described with reference to figure 7.With reference to figure 7, keep object lens 84 by the lens carrier among the dual-axis actuator 3c 60.Light shielding plate 62 is installed in lens carrier 60 parts.When object lens 84 followed the mark direction and move, light shielding plate 62 also followed the mark direction and moves.
By difference testing circuit 64 and 65, the light receiving surface 63a of two spectrophotometric detectors 63 and the output current of 63b are converted to voltage signal, 66 pairs of these voltage signals of subtracter are carried out subtraction.The output of subtracter 66 is as mid point error signal CE.
When object lens 84 were positioned at point midway, light shielding plate 62 was positioned at the center of the input path of light receiving surface 63a and 63b, and shielded the light quantity that incides light receiving surface 63a and 63b equally.Thereby, be 0 as the mid point error signal CE of the light quantity difference between light receiving surface 63a and the 63b.
On the contrary, when object lens 84 are followed the mark direction and are shifted,, and reduce by another light quantity that receives among light receiving surface 63a and the 63b because the position of light shielding plate 62 is shifted, thereby increased by one among light receiving surface 63a and 63b light quantity that receives.Thereby, have and sense of displacement and the corresponding signal value of displacement as the mid point error signal CE of the light quantity difference between light receiving surface 63a and the 63b.
Using reflected light to produce by matrix operation under the situation of mid point error signal CE, as with reference to figure 5 described in first configuration example, when closing focus servo, correctly do not detect reflected light, and do not obtain mid point error signal CE.Yet under situation about using as the middle point sensor in second configuration example, no matter which kind of state focus servo is in, and all can obtain mid point error signal CE.
Then in first or second configuration example, describing by the skip floor of carrying out according to the disk drive device of present embodiment.
Fig. 8 illustrates the configuration example of recording layer when dish 1 is dual layer discs.Arrow shown in Figure 8 is represented the direction from the laser incident of pick-up 3.
On near the surface of the dish 1 of laser light incident side, form overlayer CV.Recording layer away from the laser light incident side is layer L0, and the recording layer of close laser light incident side is a layer L1.
For example, in this recording layer structure, from can carry out/from the state of the recording/playback of the recording track of recording layer L0 to can carry out/from the conversion of the state of the recording/playback of the recording track of recording layer L1 or from can carry out/from the state of the recording/playback of the recording track of recording layer L1 to can carry out/from the conversion of the state of the recording/playback of the recording track of recording layer L0, be called as " skip floor ".
When carrying out skip floor, force to move the object lens 84 that kept by dual-axis actuator 3c along focus direction.At this moment, kick pulse and brake pulse are used as the skip floor drive signal that offers dual-axis actuator 3c.
The skip floor drive signal that Fig. 9 illustrates when carrying out skip floor viewed focus error signal FE and produced by servo signal processor 9b.
With reference to figure 9,, obtain promptly, to focus on layer L1 to coiling the state in focus of 1 layer L1 up to moment t0.Because focus servo is opened, thereby the level of viewed focus error signal FE is about 0.
When t0 begins skip floor in the moment, close tracking servo and focus servo.Produce the kick pulse as the skip floor drive signal, and force mobile object lens 84 along focus direction by dual-axis actuator 3c.Thereby, since moment t0, layer L1 in focus near observe half as the S shape waveform of focus error signal FE.
When object lens 84 continue when mobile, layer L0 in focus near observe the first half as the S shape waveform of focus error signal FE.For example, when observing the first half S shape waveform, apply brake pulse, and reduce the translational speed of object lens 84 as the skip floor drive signal.Then, t1 opens focus servo in the zero passage moment of S shape waveform, obtains the state in focus to layer L0.After carrying out the focus servo capture operation, open tracking servo, and carry out the tracking servo capture operation.Therefore, obtaining can the state of executive logging to purpose stratum L0/ from the L0 playback of purpose stratum.
According to the timing of beating direction and producing the S shape waveform of focus error signal FE, can suitably change the application time of the kick pulse that is used for this skip floor and brake pulse and apply level.Thereby, can compensate because the difference in the deflection of face and the behavior that attitude difference is caused.
For this skip floor, because the influence of the off-centre of the off-centre of dish 1 or clamp position, when closing tracking servo, the vibration that object lens 84 follow the mark direction increases.Thereby as mentioned above, the vibration that is increased produces bad influence to the stability and the rapidity of skip floor.
Therefore, servo by when carrying out skip floor, using mid point in the present embodiment, can improve the stability and the rapidity of skip floor.
To the example of three processing handling according to the skip floor of present embodiment be described.
Then first example of skip floor being handled with reference to Figure 10 describes.It is the skip floor series processing of being carried out by servo controller shown in Figure 2 51 according to from the instruction of CPU 15 that this skip floor is handled.
In order to begin skip floor, in step F 101, servo controller 51 cuts out tracking servo, and it is servo to open mid point.In other words, switch unit shown in Figure 2 60 is switched to terminal TCS from terminal TTS.Thereby, being right after after closing tracking servo, dual-axis actuator 3c operates, and makes under the servo control of mid point object lens 84 to be set to point midway.
Open mid point servo after, in step F 102, servo controller 51 waits for that object lens 84 follow vibration stable of mark direction.When central point tolerance signal CE is in the predetermined level range, can be judged to be tracking and stablizes.
In step F 102, when monitoring mid point error signal CE, servo controller 51 waits for that trackings are stable, and reaches when stablizing when being judged to be, and in step F 103, it is servo that servo controller 51 cuts out mid point.In other words, servo controller 51 switches to terminal TTOFF with switch unit 60.
In step F 104, servo controller 51 sends the spherical aberration adjustment instruction on the purpose stratum of beating.In response to this instruction, expansion control signal processor 9e output is used for the control signal of the 3e of expansion lens mechanism, makes the 3e of expansion lens mechanism carry out the spherical aberration adjustment., can carry out spherical aberration and adjust with reference to as described in the figure 4 as above-mentioned as control to liquid crystal panel 3g.
In step F 105, servo controller 51 cuts out focus servo, and the beginning skip floor moves.In other words, servo controller 51 switches to terminal TLJ with switch unit 59 from terminal TFS, and makes the 54 output kick pulses of skip floor signal generator.
Therefore, dual-axis actuator 3c begins skip floor and moves.
During jumping moved, servo controller 51 monitored the waveform of focus error signal FE, and in predetermined timing, in step F 106, servo controller 51 makes skip floor signal generator 54 output brake pulses.Thereby, reduce dual-axis actuator 3c and jump the speed of moving.For example, at the time point of the zero passage of the S shape waveform that detects focus error signal FE, in step F 107, servo controller 51 switches to terminal TFS with switch unit 59 from terminal TLJ, and opens focus servo.Thereby, carry out the focus servo capture operation.
After carrying out the focus servo capture operation, in step F 108, when monitoring mid point error signal CE, servo controller 51 waits for that tracking is stable.When being judged to be when reaching tracking and stablizing, in step F 109, servo controller 51 is opened tracking servo.In other words, servo controller 51 switches to terminal TTS with switch unit 60 from terminal TTOFF.Thereby, carry out the tracking servo capture operation, and obtain can executive logging to the purpose stratum of beating/from the state of the purpose stratum playback of beating.Thus, finish a series of skip floor operations.
First example that skip floor is handled is characterised in that, closes tracking servo and open mid point servo in step F 101.To describe this feature.
Figure 13 A and 13B illustrate from the time point of closing tracking servo and begin to stablizing the required time.Among Figure 13 A and the 13B each shows mid point error signal CE and is used to judge stable threshold value th1 and th2.In other words, in the time of in the level range of central point tolerance signal CE between threshold value th1 and th2, be judged to be that to reach tracking stable.
Figure 13 A does not open the servo situation of mid point after being illustrated in and closing tracking servo,, adopts the situation of known operating system that is.Figure 13 B is illustrated in the operating system according to present embodiment and closes tracking servo and open the servo situation of mid point.
For example, begin the skip floor sequence at moment t21.During before the moment t21, tracking servo is in open mode, and laser is followed track.Control owing to carry out during this period, thereby in swing circle, the error amount of mid point error signal CE changes with the eccentric corresponding tracking servo of dish 1.
For the known system shown in Figure 13 A, when beginning the skip floor sequence at moment t21 and closing tracking servo, object lens 84 oscillatory regime flip-flop under the control of tracking servo from swing circle is a free state.Therefore, object lens 84 temporarily vibrate with the resonant frequency f0 of dual-axis actuator 3c, and since moment t21, observe mid point error signal CE as shown in FIG. 13A.
In known system,, waiting for that beginning jumping after tracking is stablized moves for fear of the influence of this vibration when carrying out skip floor.Yet mid point error signal CE is not in the level range between threshold value th1 and th2, up to moment t23.In addition owing to vibration is not restrained control especially, even thereby be judged to be reach tracking stable after, object lens also continue vibration.
On the contrary, in the present embodiment, shown in Figure 13 B, the moment t21 in beginning skip floor sequence closes tracking servo and opens mid point servo.Thereby under the servo control of mid point, the vibration of object lens 84 restrains fast, and for example is judged to be at the moment t22 more Zao than moment t23 that to reach tracking stable.In addition, because by the servo inhibition vibration of mid point, thereby vibration no longer continues after convergence.
As mentioned above,, compare, can significantly reduce in step F 102 and to wait for that tracking stablizes the required time with known system according to processing shown in Figure 10.
In addition, because by the servo vibration that has suppressed to follow the mark direction of mid point, thereby move after neutralization beats, eliminated the influence of the vibration that follows the mark direction that the off-centre owing to the anterior layer of beating causes in jumping.Thereby, reduced the vibration that follows the mark direction in the hopping process as cross action to the influence of moving along focus direction.In addition owing to suppressed the vibration that off-centre caused by the layer before beating, thereby the processing in the step F 108 not need to wait as long for tracking stable.In addition, owing to carry out the tracking servo capture operation with the littler vibration that follows the mark direction in step F 109, thereby can stably carry out the tracking servo capture operation at short notice.
As mentioned above, according to beginning to jump first example that moves the servo skip floor processing of front opening mid point, stably carry out skip floor at short notice.
Because it is servo to open mid point when focus servo is opened, thereby can utilizes first configuration example shown in Figure 1 or second configuration example shown in Figure 6 to carry out this skip floor and handle.
Then second example the skip floor of being carried out by servo controller 51 being handled with reference to Figure 11 describes.
In order to begin skip floor, the step F 201 in Figure 11, servo controller 51 cuts out tracking servo and opens mid point servo.In other words, servo controller 51 switches to terminal TCS with switch unit shown in Figure 2 60 from terminal TTS.Thereby, being right after after closing tracking servo, dual-axis actuator 3c operates, and makes under the servo control of mid point object lens 84 to be set to point midway.
Open mid point servo after, in step F 202, servo controller 51 waits for that object lens 84 follow vibration stable of mark direction.
At step S202, when monitoring mid point error signal CE, servo controller 51 waits for that tracking is stable.In other words, as above described with reference to figure 13B, servo controller 51 waits for, in mid point error signal CE is in level range between threshold value th1 and the th2.Reach stable if be judged to be, it is servo then to close mid point in step F 203.In other words, servo controller 51 switches to terminal TTOFF with switch unit 60.
In step F 204, servo controller 51 sends the spherical aberration adjustment instruction on the purpose stratum of beating.In response to this instruction, the control signal of the expansion control signal processor 9e output expansion lens 3e of mechanism makes the 3e of expansion lens mechanism carry out the spherical aberration adjustment.As above described with reference to figure 4, can carry out spherical aberration and adjust as control to liquid crystal panel 3g.
In step F 205, servo controller 51 cuts out focus servo, and the beginning skip floor moves.In other words, servo controller 51 switches to terminal TLJ with switch unit 59 from terminal TFS, and makes the 54 output kick pulses of skip floor signal generator.Thereby dual-axis actuator 3c begins jumping and moves.
Move past in the journey in jumping, servo controller 51 monitors the waveform of focus error signal FE, and in predetermined timing, in step F 206, servo controller 51 makes skip floor signal generator 54 output brake pulses.Thereby, reduce dual-axis actuator 3c and jump the speed of moving.For example, at the time point of the zero passage of the S shape waveform that detects focus error signal FE, in step F 207, servo controller 51 switches to terminal TFS with switch unit 59 from terminal TLJ, and opens focus servo.Thereby, carry out the focus servo capture operation.
After carrying out the focus servo capture operation, it is servo to open mid point in step F 208.In other words, servo controller 51 switches to terminal TCS with switch unit 60 from terminal TTOFF.Thereby dual-axis actuator 3c carries out the mid point servo operation.
In step F 209, servo controller 51 monitors mid point error signal CE, and waits for that tracking is stable.Then, in step F 210, be judged to be in the time of in the level range of central point tolerance signal CE between threshold value th1 and th2 that to reach tracking stable, it is servo that servo controller 51 cuts out mid point, and open tracking servo.In other words, servo controller 51 switches to terminal TTS with switch unit 60 from terminal TCS.Thereby, carry out the tracking servo capture operation, and obtain can executive logging to the purpose stratum of beating/from the state of the purpose stratum playback of beating.Thereby, finish a series of skip floor operations.
In second example that skip floor is handled, in the processing of the step F 208 after jumping moves, and in the processing before jumping moves, mid point is servo to be opened.
Open in the processing of the step F 201 before jumping moves that mid point is servo to have an identical advantage of handling with skip floor of first example.
In second example that skip floor is handled, follow the vibration of mark direction after opening after jumping moves that mid point is servo and having suppressed to beat.Thereby, can further reduce in the processing of step F 209 and to wait for that tracking stablizes the required time, and can carry out tracking servo capture operation in the processing of step F 210 with little vibration.Thereby, can in the shorter time, more stably carry out the tracking servo capture operation.
As mentioned above, according to before jumping moves and jump and to open second example that the servo skip floor of mid point is handled after moving, can in shorter time, more stably carry out skip floor.
Because it is servo to open mid point when focus servo is opened, thereby can utilizes first configuration example shown in Figure 1 or utilize second configuration example shown in Figure 6 to carry out this skip floor processing.
Then the 3rd example of the skip floor of being carried out by servo controller 51 being handled with reference to Figure 12 describes.
In order to begin skip floor, in step F shown in Figure 12 301, servo controller 51 cuts out tracking servo and opens mid point servo.In other words, servo controller 51 switches to terminal TCS with switch unit shown in Figure 2 60 from terminal TTS.Thereby, being right after after closing tracking servo, dual-axis actuator 3c operates, and makes under the servo control of mid point object lens 84 to be set to point midway.
Open mid point servo after, in step F 302, servo controller 51 monitors mid point error signal CE, and waits for that object lens 84 follow vibration stable of mark direction.
In step F 303, servo controller 51 sends the spherical aberration adjustment instruction on the purpose stratum of beating.In response to this instruction, the control signal of the expansion control signal processor 9e output expansion lens 3e of mechanism makes the 3e of expansion lens mechanism carry out the spherical aberration adjustment.As above described with reference to figure 4, can carry out spherical aberration and adjust as control to liquid crystal panel 3g.
In step F 304, servo controller 51 cuts out focus servo, and the beginning skip floor moves.In other words, servo controller 51 switches to terminal TLJ with switch unit 59 from terminal TFS, and makes the 54 output kick pulses of skip floor signal generator.Thereby dual-axis actuator 3c begins jumping and moves.
Move past in the journey in jumping, servo controller 51 monitors the waveform of focus error signal FE, and in predetermined timing, in step F 305, servo controller 51 makes skip floor signal generator 54 output brake pulses.Thereby, reduce dual-axis actuator 3c and jump the speed of moving.For example, at the time point of the zero passage of the S shape waveform that detects focus error signal FE, in step F 306, servo controller 51 switches to terminal TFS with switch unit 59 from terminal TLJ, and opens focus servo.Thereby, carry out the focus servo capture operation.
After carrying out the focus servo capture operation, in step F 307, servo controller 51 monitors mid point error signal CE, and waits for that tracking is stable.To reach tracking stable if be judged to be, and then at step S308, it is servo and open tracking servo that servo controller 51 cuts out mid point.In other words, servo controller 51 switches to terminal TTS with switch unit 60 from terminal TCS.Thereby, carry out the tracking servo capture operation, and obtain can executive logging to the purpose stratum of beating/from the state of the purpose stratum playback of beating.Thereby, finish a series of skip floor operations.
In the 3rd example that skip floor is handled, in that to open mid point from jumping moves before the processing of step F 301 servo, then in the processing of step F 308, to close between the mid point servo phase to moving in jumping, mid point is servo to continue to be in open mode.In other words, jumping move preceding, jump moving neutralization jump move after, mid point is servo to continue to be in open mode.
Jumping moves that the front opening mid point is servo to have an identical advantage of handling with skip floor of first example.After moving, jumping opens that mid point is servo to have second advantage that example is identical handling with skip floor.
In addition, in the 3rd example that skip floor is handled, move past in jumping that to open mid point in the journey servo, follow the vibration of mark direction during this has suppressed to beat.Thereby, can be suppressed at the vibration that follows the mark direction during beating, and can stablize to jump and move, wherein should vibration can influence moving as cross action along focus direction.In addition, owing to continued to suppress to follow the vibration of mark direction, thereby further reduced and waited for that in the processing of step F 307 tracking stablizes the required time, and required a very short time as the stand-by period by continuous mid point servo operation.
As mentioned above, preceding according to moving in jumping, jump moving neutralization jump after moving during, mid point is servo to continue to be in the 3rd example that the skip floor of open mode is handled, and can more stably carry out skip floor in the shorter time.
Because when focus servo was closed, it was servo to carry out mid point during jumping moves, thereby can utilizes second configuration example shown in Figure 6 to carry out skip floor and handle.
According to the foregoing description, can realize the stability and the rapidity of skip floor.In other words, owing to be opened carrying out as mid point is servo during the sequence of operations of skip floor certain, and under the servo control of mid point, stablize the vibration that object lens follow the mark direction, thereby can realize the stability that these a series of skip floors are operated, and can reduce this a series of required times of skip floors operation.
Especially, move servo quick the inhibition because the vibration that follows the mark direction that off-centre before the skip floor and disturbance are caused of front opening mid point in jumping, thereby reduced the stand-by period of removing the beginning up to jumping.In addition, owing to before beating, suppressed to follow the vibration of mark direction, thereby can make and jump the stable operation that moves past in the journey.In addition, follow the vibration of mark direction after beating, thereby can realize reducing stable stand-by period of tracking and stability and the rapidity in the tracking servo capture operation owing to also reduced.
After moving, jumping opens the servo quick vibration that follows the mark direction after having suppressed to beat of mid point.Thereby, the tracking servo capture operation can be stablized, and time and required time of capture operation can be reduced up to capture operation begins.
During jumping moves, open the servo vibration that has suppressed during jumping moves, to follow the mark direction of mid point, suppressed the influence that causes by cross action, and stablized to jump and moved operation focus direction.In addition, when carrying out the tracking servo capture operation in the back of beating, the influence of the vibration of the forward position tracking direction of beating does not occur, and can realize reducing to stable stand-by period of tracking and stability and the rapidity in the tracking servo capture operation.
First example, second example and the 3rd example as the skip floor processing, illustrated in jumping and moved the servo example of front opening mid point, before jumping moves and jump and to open the servo example of mid point after moving, and jumping move preceding, jump move during and jump and move the servo example that continues to be in open mode of back mid point.Yet, can consider other processing example.
In other words, can consider the only servo example that is in open mode of mid point during jumping moves.
In addition, can consider only to move the servo example that is in open mode of back mid point in jumping.
In addition, can consider during jumping moves, to move the servo example that is in open mode of back mid point with jumping.
In addition, can consider before jumping moves and jump move during the servo example that is in open mode of mid point.
In addition, carry out the spherical aberration adjustment in example, can move past execution spherical aberration adjustment in the journey in stable stand-by period or in jumping at tracking although handle at each.
In addition, system can not need the spherical aberration adjustment.
In addition, although structure and operation with the corresponding disk drive device of playback reproducer (record/playback apparatus) have been described in the above-described embodiments, the present invention is also applicable to the device that only is used for playback or only be used to the device that writes down.
Obviously, the present invention is applicable to that also the skip floor of the interlayer with three layers or more multi-layered multilayer disc handles.
It will be appreciated by those skilled in the art that various distortion, combination, sub-portfolio and change to occur, as long as it is in the scope of appended claims or its equivalent according to designing requirement and other factors.
Claims (8)
1. a playback reproducer is used for the recording medium that playback has a plurality of recording layers, and this playback reproducer comprises:
Optical head, it uses object lens to utilize these a plurality of recording layers of laser radiation as output terminal, the reflective information of detection laser, and the information of reading and recording in these a plurality of recording layers;
Actuator, it keeps object lens, so that object lens can move along focus direction and tracking direction;
Focus servo apparatus is used for basis from the focus error signal that the reflective information that optical head read obtains, and comes driving actuator to carry out focus servo;
Layer mobile drive deivce is used to produce the skip floor drive signal that is used for the position of object lens is moved to from the position in focus of a recording layer position in focus of another recording layer, carries out object lens moving along the interlayer direction with driving actuator;
The tracking servo device is used for basis from the tracking error signal that the reflective information that optical head read obtains, and comes driving actuator to carry out tracking servo;
The mid point servomechanism installation is used for according to departing from the mid point error signal of the error signal of its point midway on the tracking direction as object lens, comes driving actuator servo with the mid point that execution is used for object lens are set to point midway; And
The skip floor sequence control device, be used to carry out a series of skip floor operations, and carrying out the predetermined amount of time of this a series of skip floor in operating period, it is servo to make the mid point servomechanism installation carry out mid point, wherein this a series of skip floors operation comprises and makes the tracking servo device close tracking servo, make focus servo apparatus close focus servo so that layer mobile drive deivce carried out object lens along the moving of interlayer direction, make focus servo apparatus open focus servo, and make the tracking servo device open tracking servo.
2. playback reproducer according to claim 1, it is characterized in that, this skip floor sequence control device makes the mid point servomechanism installation carry out this a series of skip floor in operating period, makes object lens begin predetermined amount of time before the moving of interlayer direction at layer mobile drive deivce, and the execution mid point is servo.
3. playback reproducer according to claim 1, it is characterized in that, this skip floor sequence control device makes the mid point servomechanism installation carry out this a series of skip floor in operating period, makes object lens finish predetermined amount of time after the moving of interlayer direction at layer mobile drive deivce, and the execution mid point is servo.
4. playback reproducer according to claim 1, it is characterized in that, this skip floor sequence control device makes the mid point servomechanism installation carry out this a series of skip floor in operating period, carries out making object lens during the moving of interlayer direction at layer mobile drive deivce, and the execution mid point is servo.
5. the layer jump method in the playback reproducer, this playback reproducer uses object lens to utilize laser radiation to have the recording medium of a plurality of recording layers as output terminal, the reflective information of detection laser, and the information of reading and recording in these a plurality of recording layers, this layer jump method is used for object lens from moving to the state of the information that can read from another recording layer from the state that a recording layer reads information, and this method may further comprise the steps:
Close tracking servo;
Close focus servo to carry out object lens moving along the interlayer direction;
Open focus servo;
Open tracking servo; And
At the predetermined amount of time of skip floor in operating period of carrying out from the step of closing tracking servo to the step of opening tracking servo, it is servo to carry out the mid point that is used for object lens are set to the point midway on the tracking direction.
6. the layer jump method in the playback reproducer according to claim 5 is characterized in that, from the step of closing tracking servo to close focus servo with carry out object lens during the step that moves of interlayer direction in, carry out the servo step of mid point and be performed.
7. the layer jump method in the playback reproducer according to claim 5 is characterized in that, during from the step of opening focus servo to the step of opening tracking servo in, carry out the servo step of mid point and be performed.
8. the layer jump method in the playback reproducer according to claim 5 is characterized in that, carry out along the interlayer direction move during in, carry out the servo step of mid point and be performed.
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| US20100118685A1 (en) | 2008-11-12 | 2010-05-13 | Yoshiaki Komma | Optical recording medium, manufacturing method for optical recording medium, information recording/reproducing method and information recording/reproducing device |
| MX2010012805A (en) | 2008-11-12 | 2010-12-07 | Panasonic Corp | Optical recording medium and optical information device. |
| JP2011134414A (en) * | 2009-12-25 | 2011-07-07 | Hitachi-Lg Data Storage Inc | Optical disc device and data reproduction method for the same |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0793764A (en) * | 1993-09-24 | 1995-04-07 | Sony Corp | Method and device for controlling objective lens position |
| JPH11203685A (en) * | 1997-12-29 | 1999-07-30 | Toshiba Corp | Focus servo control device and disk reproducing device |
| CN1416122A (en) * | 2001-10-30 | 2003-05-07 | 扬智科技股份有限公司 | Control device of floor skip of optical disk drive and method thereof |
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- 2006-03-02 CN CNB2006100581039A patent/CN100395830C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0793764A (en) * | 1993-09-24 | 1995-04-07 | Sony Corp | Method and device for controlling objective lens position |
| JPH11203685A (en) * | 1997-12-29 | 1999-07-30 | Toshiba Corp | Focus servo control device and disk reproducing device |
| CN1416122A (en) * | 2001-10-30 | 2003-05-07 | 扬智科技股份有限公司 | Control device of floor skip of optical disk drive and method thereof |
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