JP2006252692A - Tracking control method and optical disk system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce occurrence of time out due to unsuccessful jumping and to shorten time for access by varying voltage-applying time of at least kicking voltage or brake voltage of one track jump in tracking control of an optical disk device so as to avoid degrading of the jumping precision of one track jump due to disturbance. <P>SOLUTION: In a tracking control method for the optical disk device, the voltage-applying time of at least the kicking voltage or the brake voltage of a track drive signal for one track jump of a beam spot is changed (S4, S6) in the middle of the one track jump (S2 to S6) carried out consecutively. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a tracking control method for an optical disc apparatus that performs at least one of recording and reproduction of information on an optical disc, and an optical disc apparatus.

  Optical disc devices such as audio CDs, CD-ROMs, CD-R / RWs, and DVDs (Digital Versatile Disks) have already been put into practical use, and are actively developed for various applications and high performance. Has been done. Particularly recently, along with the rapid market expansion of personal computers, the penetration rate of built-in optical disk devices in personal computers has increased.

  Here, the configuration of the optical disc apparatus will be described with reference to FIG.

  FIG. 4 is a block diagram of a conventional optical disc apparatus. In FIG. 4, 1 is an optical disk, 2 is a pickup module, 3 is a spindle motor, 4 is an RF amplifier, 6 is a controller, 7 is an actuator driver, 8 is a kick voltage / brake voltage output circuit, 9 is an optical pickup, and 10 is a carriage. It is.

  The operation of the conventional optical disc apparatus configured as described above will be described.

  The pickup module 2 includes a spindle motor 3 that rotates the optical disc 1, an optical pickup 9 that performs at least one of reading and writing information signals on the optical disc 1 using a laser emission pattern, and an optical pickup 9. This is constituted by a feed unit (not shown) for moving the carriage 10 in the radial direction of the optical disc 1.

  The RF amplifier 4 receives an RF (Radio Frequency) signal, a focus error signal, and a tracking error signal from a signal received by a reflected light receiving unit (not shown) provided in the pickup module 2 that receives the reflected light from the optical disc 1. Generate and amplify and send to controller 6. Here, the tracking error signal is a signal including positional deviation information in the radial direction of the optical disc 1 between the light beam spot and the information track of the optical disc 1.

  The controller 6 performs track jump control, which is movement control of an actuator (not shown) provided in the pickup module 2 in the radial direction of the optical disc 1 based on the tracking error signal sent from the RF amplifier 4, / A command for generating a track drive signal is issued to the brake voltage output circuit 8.

  The kick voltage / brake voltage output circuit 8 generates a kick voltage and a brake voltage for the track drive signal necessary for performing the track jump control based on a command from the controller 6, and sends them to the actuator driver 7. The actuator driver 7 performs track jump control of the actuator provided in the pickup module 2 using the sent kick voltage and brake voltage.

  Here, the track jump control is control for moving the beam spot emitted from the optical pickup 9 from the information track where the current beam spot exists to a desired information track, and the normal beam spot is changed to the current information track. When moving from one track to a desired information track, in order to complete the move in the shortest time, a one-track jump is used in which a large shift is made in the initial stage of movement and one track is moved in the final stage of movement. The track drive signal is a tracking control signal for moving the beam spot to a desired information track on the surface of the optical disc 1.

As a prior example, there is (Patent Document 1) and the like.
JP-A-4-34776

  The track jump control of the optical disc apparatus is performed using a kick voltage and a brake voltage having a pulse width and a constant amplitude corresponding to the number of information tracks that need to be jumped. In an ideal operation state in which there is no variation in the distance between information tracks on the optical disc 1, variation in actuator sensitivity of the pickup module 2, voltage variation in the circuit itself, etc., the above-described pulse width and amplitude are Because it is determined by the distance and sensitivity of the actuator that drives the optical pickup, a fixed value is set to draw an ideal movement curve that allows the optical pickup to move to the adjacent information track in the minimum time in the case of a general one-track jump. Has been.

  However, in reality, there are variations in the distance between the information tracks on the optical disc 1, variations in the actuator sensitivity of the pickup module 2, variations in the voltage of the circuit itself, and the like. With a fixed value every time, the beam spot emitted from the optical pickup may not be successfully converged with one track jump to the desired information track. In other words, even though one track jump is performed, the actual jump may be a jump of one track or more, or a jump of less than one track.

FIG. 5 is a diagram showing a waveform of one track jump in a conventional optical disc apparatus.
FIG. 5 (a) shows a case where the actual jump is a two-track jump even though one track is jumped, and FIG. 5 (b) is a one-track jump despite the one-track jump. The case where the jump is less than is shown. In FIG. 5, 501 is a tracking error signal, 506 is a track drive signal, 601 is a tracking error signal, and 606 is a track drive signal.

  The track drive signals 506 and 606 controlled by a fixed value for each disc are the same, but due to variations in the distance between information tracks on the optical disc 1, variations in actuator sensitivity of the pickup module 2, variations in voltage of the circuit itself, etc. It can be seen that the tracking error signal (TE signal) 501 indicating the operating state is different from the tracking error signal (TE signal) 601.

  FIG. 6 is a flowchart showing a one-track jump in the conventional optical disc apparatus.

  A fixed value determined in advance for each type of the optical disc 1 is set as a jump parameter of a track driving signal for performing one track jump in accordance with the attached optical disc 1 (S11). Next, one track jump is performed based on the set jump parameter of the track drive signal (S12). At this time, if a variation in the distance between the information tracks on the optical disk 1, a variation in the actuator sensitivity of the pickup module 2, a variation in the voltage of the circuit itself, or the like occurs, the actual jump is one track or more despite one track jump. 5A, the waveform of the tracking error signal 501 shown in FIG. 5A is obtained. When the jump is less than one track, the waveform of the tracking error signal 601 shown in FIG. 5B is obtained. .

  In this way, if the actual jump becomes a jump of one or more tracks or a jump of less than one track despite the jump of one track, the movement to the desired information track is successful. In other words, timeouts caused by jump failures and access time increased.

  The present invention solves such a conventional problem, and varies at least one voltage application time of a kick voltage or a brake voltage of one track jump in the tracking control of the optical disc apparatus, and makes a jump of one track jump due to a disturbance. An object of the present invention is to provide a tracking control method for an optical disc apparatus and an optical disc apparatus that can avoid deterioration in accuracy.

  The present invention has been made to solve the above problems, and is a tracking control method for an optical disc apparatus that moves a beam spot to a desired information track on an optical disc surface using a track drive signal. A tracking control method for an optical disc apparatus, wherein a voltage application time of at least one of a kick voltage and a brake voltage of a track drive signal for causing a one-track jump to be changed is changed during a one-track jump performed continuously. .

  The optical disk apparatus of the present invention also includes an optical pickup that records and / or reproduces data using a laser emission pattern, a reflected light receiving unit that receives reflected light from the optical disk, and tracking from the received signal. An RF amplifier that generates and amplifies an error signal, jump result detection means that detects the operation status of one track jump from the tracking error signal, and a control unit that controls the track drive signal, and the control unit jumps the beam spot by one track An optical disc apparatus characterized in that the voltage application time of at least one of the kick voltage and the brake voltage of the track drive signal to be changed is changed in the middle of one track jump that is continuously performed.

  According to the present invention, by applying the above configuration, the voltage application time of at least one of the kick voltage and the brake voltage of the track driving signal for jumping the beam spot by one track is changed during the one-track jump that is continuously performed. Even if a disturbance such as a fluctuation of 1 itself, a PUM (pickup module 2) actuator, a voltage fluctuation of the circuit itself or the like occurs, the voltage application time of at least one of the kick voltage and the brake voltage of the track drive signal is determined according to the situation. Since the one-track jump is accurately performed, it is possible to change to the optimum voltage application time of the kick voltage and the brake voltage.

  Therefore, it is possible to vary the voltage application time of at least one of the kick voltage and the brake voltage for one track jump in the tracking control of the optical disc apparatus, to avoid the deterioration of the jump accuracy of the one track jump due to disturbance, and to prevent timeout due to jump failure. It is an object of the present invention to provide a tracking control method for an optical disc apparatus and an optical disc apparatus that can reduce the access time and the access time.

  According to the first aspect of the present invention, there is provided a tracking control method of an optical disc apparatus for moving a beam spot to a desired information track on an optical disc surface using a track drive signal, and a kick of a track drive signal for jumping the beam spot by one track. The voltage application time of at least one of the voltage and the brake voltage is changed during one track jump that is continuously performed. Variation in the distance between information tracks on the optical disc by changing the voltage application time of at least one of the kick voltage and the brake voltage of the track drive signal for causing the beam spot to jump one track during the one-track jump performed continuously. Even if disturbance such as actuator sensitivity variation of the pickup module or voltage variation of the circuit itself occurs, the track application signal kick voltage or brake voltage application time is set to one track jump depending on the situation. Can be changed to the optimum application time of the kick voltage and the brake voltage for accurately performing the above. This makes it possible to vary the voltage application time of at least one of the kick voltage and the brake voltage for one track jump in the tracking control of the optical disc apparatus, and to avoid the deterioration of the jump accuracy of the one track jump due to disturbance. It is possible to realize a tracking control method for an optical disc apparatus that can reduce timeout and shorten access time.

  The invention according to claim 2 is characterized in that, based on a result obtained by binarizing a tracking error signal generated based on a one-track jump operation with an arbitrary threshold value, it is determined whether the one-track jump is normally performed. To do. Based on the result obtained by binarizing the tracking error signal generated based on the operation of one track jump with an arbitrary threshold value, it is determined whether the one track jump has been performed normally. It is possible to easily check whether the operation is accurately performed.

  According to a third aspect of the present invention, the voltage application time of at least one of the kick voltage and the brake voltage of the track drive signal is a result of binarizing a tracking error signal generated based on an operation of one track jump with an arbitrary threshold value. It is changed based on this. The voltage application time of at least one of the kick voltage or the brake voltage of the track drive signal is changed based on the result of binarizing the tracking error signal generated based on the operation of one track jump with an arbitrary threshold value, thereby continuously Thus, when changing the voltage application time of at least one of the kick voltage and the brake voltage of the track drive signal during one track jump, the track jump status can be easily grasped.

  In the invention according to claim 4, when one track jump is started and the polarity of the tracking error signal first appearing corresponding to the track jump is defined as the positive side and the opposite polarity is defined as the negative side, As a result of binarizing the tracking error signal generated based on one track jump operation with an arbitrary threshold value, the portion exceeding the arbitrary threshold value is less than once in either the positive side or the negative side and is negative. When the time exceeding the threshold on the side is shorter than the time of the TW value, which is the maximum time during which one track can be normally jumped, it is determined that one track jump is being performed normally. The portion where the arbitrary threshold is exceeded is less than once in either the plus or minus polarity, and the time when the minus threshold is exceeded is shorter than the time of the TW value, which is the maximum time that can normally jump one track. In this case, it is possible to easily and accurately grasp the operation status of the one-track jump by determining that the one-track jump is normally performed.

  According to the fifth aspect of the present invention, when the polarity of the tracking error signal first appearing in response to the start of one track jump is defined as the plus side, the arbitrary threshold on the plus side is set to the tracking error signal. The voltage is 40 to 60% with respect to half the voltage. Since the arbitrary threshold value on the plus side is 40 to 60% with respect to the half voltage of the tracking error signal, the accuracy of the distance moved by the jump of one tracking jump can be improved.

  According to the sixth aspect of the present invention, when one track jump is started and the polarity on the opposite side to the polarity of the tracking error signal first appearing corresponding to the track jump is defined as the minus side, an arbitrary threshold value on the minus side Is 40 to 60% of the voltage half the tracking error signal. The arbitrary threshold value on the negative side is 40 to 60% with respect to the voltage that is half of the tracking error signal, so that the accuracy of the distance moved by the jump of one tracking jump can be improved.

  According to a seventh aspect of the present invention, there is provided an optical pickup that records and / or reproduces data using a laser emission pattern, a reflected light receiving unit that receives reflected light from an optical disc, and a tracking error from the received signal. An RF amplifier that generates and amplifies a signal, a jump result detection unit that detects an operation state of one track jump from a tracking error signal, and a control unit that controls a track driving signal, and the control unit causes the beam spot to jump one track. The voltage application time of at least one of the kick voltage and the brake voltage of the track drive signal is changed during one track jump that is continuously performed. The control unit changes the voltage application time of at least one of the kick voltage and the brake voltage of the track driving signal for jumping the beam spot by one track during the one track jump performed continuously, so that the information track between the optical disks Even if disturbance such as variation in distance, actuator sensitivity of the pickup module, voltage variation of the circuit itself occurs, the voltage application time of at least one of the kick voltage or brake voltage of the track drive signal depends on the situation, It is possible to change to the optimum application time of the kick voltage and the brake voltage for accurately performing one track jump. This makes it possible to vary the voltage application time of at least one of the kick voltage and the brake voltage for one track jump in the tracking control of the optical disc apparatus, and to avoid the deterioration of the jump accuracy of the one track jump due to disturbance. It is possible to realize an optical disc apparatus capable of reducing timeout and shortening access time.

(Embodiment 1)
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram of an optical disc apparatus according to an embodiment of the present invention. In FIG. 1, 1 is an optical disk, 2 is a pickup module, 3 is a spindle motor, 4 is an RF amplifier, 5 is a jump result detection means, 6 is a controller, 7 is an actuator driver, 8 is a kick voltage / brake voltage output circuit, 9 Is an optical pickup, and 10 is a carriage. Here, the controller 6 constitutes a control unit of the present invention, and signals sent from the RF amplifier 4, jump result detection means 5, actuator driver 7, and kick voltage / brake voltage output circuit 8 are input. This calculation process is performed, the result (signal) of this calculation process is sent to each part, the drive and process are executed in each part, and each part is controlled. Although detailed description and illustration are omitted, the controller 6 includes at least an arithmetic processing device such as a CPU and MPU having an arithmetic function, and a storage device such as a ROM and RAM.

  An optical disc apparatus according to an embodiment of the present invention configured as described above will be described.

  The pickup module 2 includes a spindle motor 3 that rotates the optical disk 1, an optical pickup 9 that performs at least one of reading and writing information signals on the optical disk 1 using a laser emission pattern, and a carriage on which the optical pickup is mounted. 10 and a feed unit (not shown) for moving the optical disk 1 in the radial direction of the optical disk 1.

  The RF amplifier 4 receives an RF (Radio Frequency) signal, a focus error signal, and a tracking error signal from a signal received by a reflected light receiving unit (not shown) provided in the pickup module 2 that receives the reflected light from the optical disc 1. The generated signal is amplified and sent to the jump result detection means 5. Here, the tracking error signal is a signal including positional deviation information in the radial direction of the optical disc 1 between the light beam spot and the information track of the optical disc 1.

  When the sent tracking error signal is a signal based on one track jump, the jump result detecting means 5 detects the operation status of the one track jump and informs the controller 6 of the status. If the tracking error signal sent is not a signal based on a one-track jump, for example, in the case of a large movement at the initial stage of beam spot movement, the tracking error signal is sent to the controller 6 as it is. In this embodiment, it is preferable to determine whether or not the tracking error signal is a signal based on a one-track jump based on a result obtained by binarization with an arbitrary threshold described later. By doing so, it is possible to easily determine whether or not the tracking error signal is a signal based on one track jump.

  The controller 6 performs a track jump control, which is a movement control in the radial direction of the optical disc 1 of an actuator (not shown) provided in the pickup module 2 based on the information sent from the jump result detection means 5, so that the kick voltage / A command for generating a track drive signal is issued to the brake voltage output circuit 8.

  The kick voltage / brake voltage output circuit 8 generates a kick voltage and a brake voltage for the track drive signal necessary for performing the track jump control based on a command from the controller 6, and sends them to the actuator driver 7. The actuator driver 7 performs track jump control of the actuator provided in the pickup module 2 using the sent kick voltage and brake voltage.

  Here, the track jump control is a control for moving the beam spot emitted from the optical pickup from the information track where the current beam spot exists to a desired information track, and the normal beam spot is moved from the current information track. When moving to a desired information track, in order to complete the movement in the shortest time, a one-track jump is used in which a large movement is performed in the initial stage of movement and one track is moved in the final stage of movement. The track drive signal is a tracking control signal for moving the beam spot to a desired information track on the surface of the optical disc 1.

  Next, tracking control of one-track jump, which is a characteristic part of the present invention, will be described with reference to FIGS.

  FIG. 2 is a diagram showing a waveform of one track jump of the optical disc apparatus according to the embodiment of the present invention. FIG. 2A shows that the actual jump is two tracks even though one track jump is performed. FIG. 2B shows a correction method in the case where the jump is less than one track despite the one-track jump. In FIG. 2, 101 is a tracking error signal (TE signal), 101a is a corrected tracking error signal, 102 is a control pulse (TEP +) calculated from the tracking error signal and a positive threshold, 102a is a corrected control pulse, 103 is Control pulse (TEP−) calculated from the tracking error signal and the minus threshold, 104 is a plus threshold (TH +), 105 is a minus threshold (TH−), 106 is a track drive signal, 201 is a tracking error signal, 201a Is a tracking error signal after correction, 202 is a control pulse (TEP +) calculated from the tracking error signal and a positive threshold, 203 is a control pulse (TEP-) calculated from the tracking error signal and a negative threshold, and 203a is a corrected pulse. Control pulse, 206 Rack drive signal, the kick voltage 401, 402 brake voltage, 402a is corrected control pulse. FIG. 3 is a flowchart of one-track jump of the optical disc apparatus according to the embodiment of the present invention.

  When the optical disk 1 is inserted, the optical disk device rotates the spindle motor 3 to emit the laser of the optical pickup, applies focus servo and tracking servo, and acquires the disk information of the optical disk 1. When the disk information is acquired, the controller 6 reads a fixed value determined in advance for each type of the optical disk 1 from a ROM or the like provided in the controller 6 based on the information, and adjusts it to the attached optical disk 1. Thus, it is set as a jump parameter of a track drive signal for performing one track jump (S1).

  Next, a track jump is performed in order to move the beam spot emitted from the optical pickup from the information track where the current beam spot exists to a desired information track based on a user instruction or an application background process. In the initial stage of movement, the actuator is moved greatly, and when the desired information track is approached to some extent, the movement method is changed to one-track jump for moving one track at a time.

  In this embodiment, the timing for switching to the one-track jump is set to be 10 to 30 tracks before the desired information track. The timing of switching to one track jump is not limited to 10 to 30 tracks before the desired information track, but by making it 10 to 30 tracks before, the jump accuracy improvement of the one track jump of the present invention and the entire jump can be achieved. The time required can be shortened to the maximum.

  Next, based on the jump parameter of the set track drive signal, the controller 6 issues a track drive signal generation command to the kick voltage / brake voltage output circuit 8. The kick voltage / brake voltage output circuit 8 generates a kick voltage and a brake voltage for the track drive signal necessary for performing the track jump control based on a command from the controller 6, and sends them to the actuator driver 7. The actuator driver 7 performs a one-track jump of the actuator provided in the pickup module 2 using the sent kick voltage and brake voltage (S2). A tracking error signal is generated from the reflected light from the optical disk 1 corresponding to the one-track jump operation.

  Here, when one track jump is started and the polarity of the tracking error signal first appearing corresponding to the track jump is defined as the positive side and the opposite side is defined as the negative side, each polarity is arbitrarily set to the polarity. A threshold is set and the tracking error signal is binarized. In the present embodiment, the arbitrary threshold value to be set is set in the range of 40 to 60% with respect to the voltage of the tracking error signal on both the plus side and the minus side. However, the present invention is not limited to this. No. If the accuracy of the distance traveled by one tracking jump is to be improved, the arbitrary threshold value to be set may be set in the range of 40 to 60% with respect to the voltage of the tracking error signal on both the positive side and the negative side. preferable.

  For example, since the tracking error signal 101 in the case of FIG. 2A exceeds the positive threshold (TH +) 104 in the range A and the range E, the control pulse (TEP +) 102 that is a binarization index is displayed. Create a pulse. In the range C, since the minus threshold (TH−) 105 is exceeded, a control pulse (TEP−) 103 that is a binarization index is set. In other ranges B and D, the positive threshold value (TH +) 104 and the negative threshold value (TH−) 105 are not exceeded. Therefore, the control pulse (TEP +) 102 and the control pulse (TEP−), which are binarization indexes, are used. ) Do not stand 103.

  Here, a control pulse such as a control pulse (TEP +) 102 or a control pulse (TEP-) 103 generated based on a tracking error signal generated based on one-track jump operation is either a plus side or a minus side. When a plurality of times appear in the polarity, it is determined that the beam spot straddles the information track on the surface of the optical disc 1 by the number of times the control pulse appears for one jump of one track (S3). By doing so, it can be easily confirmed whether or not the one-track jump performed continuously is performed accurately. In the case of FIG. 2A, the beam spot has jumped one track, but the actual jump is two tracks.

  Therefore, when a control pulse such as the control pulse (TEP +) 102 or the control pulse (TEP-) 103 appears a plurality of times in either the positive side or the negative side, the controller 6 performs the braking operation for one track jump. It is determined that the brake amount is too small or the kick amount for acceleration operation is too large, and a command is issued to the kick voltage / brake voltage output circuit 8 to increase the brake amount or to decrease the kick amount. Do. In the kick voltage / brake voltage output circuit 8, the kick amount is decreased or the brake amount is decreased by shortening the application time of the kick voltage 301 shown in FIG. 2A or increasing the application time of the brake voltage 302. The jump parameter is changed in the one-track jump (S4). By doing so, it is possible to easily grasp the status of the track jump when changing the voltage application time of at least one of the kick voltage and the brake voltage of the track drive signal during one track jump performed continuously.

  In the present embodiment, the jump parameter change when the kick amount is lowered or the brake amount is raised is dealt with by increasing the voltage application time of the brake voltage 302. However, the present invention is not limited to this. It is possible to reduce the voltage application time of the voltage 301 or to use a combination of increasing the voltage application time of the brake voltage 302 and shortening the voltage application time of the kick voltage 301. The parameter change of one track jump when the voltage application time of the brake voltage 302 is lengthened is indicated by a broken line as the one track jump continuously performed for the application time of the brake voltage 302 of the track driving signal 106 indicated by a solid line is converged. Is changed so as to approach the post-correction brake voltage 302a.

  When the change of the one-track jump parameter is completed, the one-track jump of the actuator provided in the pickup module 2 is performed again using the reset kick voltage and brake voltage (S2). As a result, the tracking error signal 101 having a peak in the region E indicated by the solid line in FIG. 2A gradually approaches the corrected tracking error signal 101a indicated by the broken line, and the control pulse (TEP +) 102 is also corrected. As shown in the control pulse 102a, the pulse itself disappears.

  A series of operations from one track jump (S2) to jump parameter change (S4) is performed by setting the control pulse (TEP +) 102 and the control pulse (TEP-) 103 to one pulse or less regardless of whether the polarity is positive or negative. Continue until. By doing so, the moving distance of the beam spot by one track jump is at least one track or less.

  Next, it is determined whether the brake amount for one track jump is too large or the kick amount is too small.

  For example, since the tracking error signal in the case of FIG. 2B exceeds the plus-side threshold (TH +) 104 in the range F, a control pulse (TEP +) 202 that is a binarization index is set. Further, since the negative threshold (TH−) 105 is exceeded in the range of the range H to the range J, the control pulse (TEP−) 203 that is a binarization index is set. In the other range G, the positive threshold value (TH +) 104 and the negative threshold value (TH−) 105 are not exceeded. Therefore, the control pulse (TEP +) 202 and the control pulse (TEP−) 203 which are binarization indexes are set. can not stand.

  A control pulse such as control pulse (TEP +) 202 or control pulse (TEP-) 203 appears only once in either the positive or negative polarity, and the control pulse (TEP-) 203 normally jumps one track. If the time is equal to or longer than the TW value, which is the maximum possible time, it is determined that the beam spot could not jump one information track on the surface of the optical disc (S5). FIG. 2B shows a case where the actual jump cannot reach one track even though one track jump is performed.

  Therefore, the control pulse such as the control pulse (TEP +) 202 and the control pulse (TEP−) 203 appears only once in the plus or minus polarity, and the control pulse (TEP−) 203 is normally 1 If the time of the TW value, which is the maximum time that can be track jumped, is greater than or equal to the time of the TW value, the controller 6 determines that the brake amount of one track jump is too large or the kick amount is too small, Alternatively, the kick voltage / brake voltage output circuit 8 is commanded to increase the kick amount.

  The kick voltage / brake voltage output circuit 8 increases the kick amount or decreases the brake amount by increasing the kick voltage application time or shortening the brake voltage application time. (S6).

  Here, the TW value is the maximum time that can be normally jumped by one track uniquely determined according to the kick voltage amount. This numerical value can be determined by design, and the ROM provided in the controller 6 Stored in a storage device.

  In the present embodiment, the jump parameter change when the kick amount is increased or the brake amount is decreased is dealt with by shortening the voltage application time of the brake voltage 402. However, the present invention is not limited to this. Instead, it is possible to increase the voltage application time of the kick voltage 401 or to use a combination of shortening the voltage application time of the brake voltage 402 and increasing the voltage application time of the kick voltage 401. The parameter change of one track jump when the voltage application time of the brake voltage 402 is shortened is indicated by a broken line as the one track jump performed continuously for the application time of the brake voltage 402 of the track drive signal 206 indicated by a solid line toward convergence. Is changed so as to approach the post-correction brake voltage 402a.

  When the change of the one-track jump parameter is completed, the one-track jump of the actuator provided in the pickup module 2 is performed again using the reset kick voltage and brake voltage (S2). As a result, the tracking error signal 201 having peaks in the regions I to J indicated by solid lines in FIG. 2B gradually approaches the corrected tracking error signal 201a indicated by broken lines, and the control pulse (TEP−) The pulse width 203 also decreases as indicated by the corrected control pulse 203a.

  A series of operations from the one-track jump (S2) to the jump parameter change (S6) is repeated until the width of the control pulse (TEP-) 203 becomes equal to or smaller than the width of the TW value. When the width of the control pulse (TEP-) 203 becomes equal to or smaller than the width of the TW value, the one-track jump ends (S7).

  In these series of operations, the jump result detection means 5 detects the operation status of one track jump from the tracking error signal and informs the controller 6 of the operation status, so that the kick voltage / brake voltage output circuit is based on the instruction of the controller 6. 8. The signal is transmitted to the actuator provided in the pickup module 2 via the actuator driver 7, and one track jump is controlled.

  As described above, the determination of whether or not the one-track jump is normally performed is that the polarity of the tracking error signal that first appears corresponding to the track jump is defined as the positive side, and vice versa. As a result of binarizing the tracking error signal generated based on one operation of one track jump with an arbitrary threshold value, the portion exceeding the arbitrary threshold value is either the positive side or the negative side. If the time when the polarity is less than once and the time when the negative threshold is exceeded is shorter than the time of the TW value, which is the maximum time during which one track can be normally jumped, one track jump is performed normally. to decide. By doing so, it is possible to easily and accurately grasp the operation status of the one-track jump.

  In this way, even when disturbances such as variations in the optical disc 1 itself, actuator variations in the pickup module 2 and voltage variations in the circuit itself occur, the voltage application time of at least one of the kick voltage or the brake voltage of the track drive signal is Depending on the situation, it is possible to change to the optimum voltage application time of the kick voltage and brake voltage in order to perform one track jump accurately.

  Therefore, it is possible to vary the voltage application time of at least one of the kick voltage and the brake voltage for one track jump in the tracking control of the optical disc apparatus, to avoid the deterioration of the jump accuracy of the one track jump due to disturbance, and to prevent timeout due to jump failure. It is possible to realize a tracking control method for an optical disc apparatus and an optical disc apparatus that can reduce the access time and the access time.

  In the present embodiment, it is confirmed that control pulses such as the control pulse (TEP +) 102 and the control pulse (TEP-) 103 are added to confirm that the one-track jump performed continuously in FIG. If it appears multiple times in either the negative or negative polarity, it is determined that the beam spot has straddled the information track on the surface of the optical disc 1 by the number of times the control pulse has appeared (S3). Maximum time during which a control pulse such as TEP +) 202 or control pulse (TEP-) 203 appears only once in either the positive or negative polarity, and the control pulse (TEP-) 203 can normally jump one track. If the time is equal to or longer than the TW value, the beam spot passes one information track on the surface of the optical disc. It was determined that could not Classification Copyright (S5), 1 order of jumping situational awareness of the track jump is not limited to this and may be performed in reverse order.

  The present invention can avoid deterioration of jump accuracy of one-track jump due to disturbance caused by an optical disc or an optical disc device, and can reduce timeout and access time due to jump failure. The present invention can be applied to a tracking control method for an optical disc apparatus that performs at least one of recording and reproduction, an optical disc apparatus, and the like.

1 is a block diagram of an optical disc apparatus according to an embodiment of the present invention. The figure which shows the waveform of 1 track jump of the optical disk apparatus in one embodiment of this invention 1 is a flowchart of one-track jump of an optical disc apparatus according to an embodiment of the present invention. Block diagram of a conventional optical disk device The figure which shows the waveform of 1 track jump in the conventional optical disk apparatus A flowchart showing a one-track jump in a conventional optical disc apparatus

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical disk 2 Pickup module 3 Spindle motor 4 RF amplifier 5 Jump result detection means 6 Controller 7 Actuator driver 8 Kick voltage / brake voltage output circuit 101 Tracking error signal 101a Corrected tracking error signal 102 Control pulse (TEP +)
102a Control pulse after correction 103 Control pulse (TEP-)
104 Positive threshold (TH +)
105 Negative threshold (TH-)
106 Track drive signal 201 Tracking error signal 201a Tracking error signal after correction 202 Control pulse (TEP +)
203 Control pulse (TEP-)
203a Control pulse after correction 301 Kick voltage 302 Brake voltage 302a Brake voltage after correction 401 Kick voltage 402 Brake voltage 402a Brake voltage after correction 501 Tracking error signal 506 Track drive signal 601 Tracking error signal 606 Track drive signal

Claims (7)

A tracking control method of an optical disc apparatus for moving a beam spot to a desired information track on an optical disc surface using a track drive signal, wherein at least one of a kick voltage and a brake voltage of the track drive signal for jumping the beam spot by one track The tracking control method for an optical disc apparatus, wherein the voltage application time is changed during a one-track jump performed continuously. The one-track jump is characterized in that it is determined whether the one-track jump has been normally performed based on a result obtained by binarizing a tracking error signal generated based on the operation of the one-track jump with an arbitrary threshold value. The tracking control method of the optical disk apparatus according to claim 1. The voltage application time of at least one of the kick voltage and the brake voltage of the track driving signal is changed based on the result of binarizing the tracking error signal generated based on the operation of the one track jump with an arbitrary threshold value. 3. The track control method for an optical disc apparatus according to claim 1, wherein the track control method is used. When the polarity of the tracking error signal that appears first in response to the track jump is defined as the plus side and the opposite polarity is defined as the minus side, the one track jump is performed once. As a result of binarizing the tracking error signal generated based on the operation with an arbitrary threshold value, the portion exceeding the arbitrary threshold value is less than once in either the positive or negative polarity and exceeds the negative threshold value. 4. The one-track jump is determined to be normally performed when the current time is shorter than the time of the TW value, which is the maximum time during which one track can be normally jumped. 2. A track control method for the optical disc apparatus according to 1. When the polarity of the tracking error signal that first appears in response to the track jump is defined as the positive side when the one-track jump is started, an arbitrary threshold on the positive side is set to a voltage half of the tracking error signal. The track control method for an optical disc apparatus according to any one of claims 1 to 4, wherein the track control method is 40 to 60%. When the one-track jump is started and the polarity opposite to the polarity of the tracking error signal that first appears in response to the track jump is defined as the minus side, an arbitrary threshold value on the minus side is half of the tracking error signal. 6. The track control method for an optical disc apparatus according to claim 1, wherein the track control method is 40 to 60% with respect to the voltage of the optical disc apparatus. An optical pickup that records and / or reproduces data using a laser emission pattern, a reflected light receiving unit that receives reflected light from an optical disc, and an RF amplifier that generates and amplifies a tracking error signal from the received signal , A jump result detecting means for detecting the operation status of one track jump from the tracking error signal, and a control section for controlling the track driving signal, the control section kicking the track driving signal for causing the beam spot to jump one track. An optical disc apparatus characterized in that a voltage application time of at least one of a voltage and a brake voltage is changed during a one-track jump performed continuously.

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