JP2005158260A - Reproducing device and reproducing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To move a data readout position to another recording layer in less time. <P>SOLUTION: If a sector to read out next is on another recording layer, an optical pickup focus position is changed at the start so that the readout position is moved to the another recording layer. Then, on a recording layer having the intended sector, the optical pickup readout position is placed on the intended sector. The method can be applied to a reproducing device reproducing an optical disk. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a reproducing apparatus and method, and in particular, when reproducing an optical disc formed such that a plurality of recording layers on which data is recorded can be read from one side, it differs from the recording layer at the current reading position. The present invention relates to a reproducing apparatus and method for moving a read position to a track to be read next after moving the read position to a record layer having a track to be read next when there is a track to be read next in the recording layer.

  At present, optical discs such as compact discs on which digital data is recorded are widely used. In such an optical disc, data is recorded on tracks formed in the circumferential direction.

  Recently, a DVD (Digital Versatile Disc), which is a large-capacity optical disc, has been developed. As a DVD format, a single layer format having one recording layer, a dual layer format having two recording layers on one side, and the like are considered.

  When reproducing data recorded on such an optical disc, a laser beam is irradiated to a pit (ie, recording layer) having a shape corresponding to the data formed on the track of the optical disc by using an optical pickup. The data is read out by photoelectrically converting the reflected light.

  The optical pickup is moved by a thread motor, for example, in a direction perpendicular to the tangential direction of the track of the optical disk, that is, in the radial direction of the optical disk. Therefore, when reading data continuously, the control circuit that controls the thread motor determines the number of tracks from the sector address that is the current read position and the sector address of the sector that is read next to the track that has the sector to be read next. The optical pickup is moved (track jump) by the number of tracks.

  Next, an example of reading position movement in a dual layer DVD will be described with reference to the flowchart of FIG.

  First, in step S1, whether the sector to be read next is in a recording layer different from the recording layer (layer) at the current reading position from the sector address St of the sector to be read next and the address Sc of the current sector. When it is determined that the next sector to be read is in a recording layer different from the recording layer at the current reading position, the process proceeds to step S2, and the address St of the next sector to be read and the address Sc of the current sector are determined. From this, the number of moving tracks in the recording layer where the current reading position is located (the number of tracks for moving the reading position) is calculated.

  In step S3, it is determined whether or not the number of moving tracks is 0. If it is determined that the number of moving tracks is not 0, in step S4, the number of moving tracks in the recording layer where the current reading position is. Only the track jump (movement of the reading position) is performed, and the process returns to step S2.

  Thus, in step S2 to step S4, the read position is read in the sector of the current recording layer (sector on the same normal line of the two recording layers) corresponding to the target sector (in the other recording layer). Is moved.

  Next, in step S5, the control of the spindle motor that rotates the optical disk is set to rough servo. In step S6, the servo control of the sled motor that moves the optical pickup in the radial direction of the optical disk and the optical pickup are controlled. Tracking servo is stopped.

  In step S7, the reading position, that is, the focus position is jumped to a predetermined recording layer by changing the distance between the objective lens of the optical pickup and the optical disk.

  Next, in step S8, the servo control of the sled motor and the tracking servo of the optical pickup are resumed.

  In step S9, the sector address and layer information are read from the optical disc. In step S10, whether or not the recording layer where the reading position is currently located is a recording layer having the target sector is determined based on the layer information. If it is determined that the recording layer at the reading position is not a recording layer having the target sector, the process returns to step S5, and the reading position is set to the recording layer having the target sector in steps S5 to S10. Until it is done, the focus position change is repeated.

  On the other hand, if it is determined in step S10 that the reading position is set in the recording layer having the target sector, the process proceeds to step S11.

  If it is determined in step S1 that the current reading position is set in the recording layer having the target sector, steps S2 to S10 are skipped and the process proceeds to step S11.

  Next, in step S11, the number of moving tracks in the recording layer where the current reading position is located is calculated from the sector address St of the next sector to be read and the address Sc of the current sector.

  In step S12, it is determined whether or not the number of moving tracks is 0. If it is determined that the number of moving tracks is not 0, the number of moving tracks in the recording layer having the target sector is determined in step S13. Only the track jump is performed, and the process returns to step S11.

  In this way, in step S11 to step S13, the reading position is moved to the target sector. When the read position is set to the target sector, the process proceeds to step S14, and servo control of the spindle motor phase is resumed.

  As described above, it is conceivable to move the reading position in the dual layer DVD. That is, as shown in FIG. 8, when the next sector to be read is in another recording layer, first, the reading position is set to the sector corresponding to the target sector in the recording layer where the reading position is at that time. Then, by changing the focus position, the reading position is moved to another recording layer, and the reading position is moved to the target sector in the moved recording layer.

  However, as described above, when the target sector is in another recording layer, first, the reading position is set in the sector corresponding to the target sector in the recording layer where the reading position is, and then the focus position is set. When the read position is moved to another recording layer by changing, the read position is shifted from the target sector due to stopping the servo when changing the focus position to another recording layer. Therefore, it is necessary to perform the process of setting the read position to a predetermined sector (chase process) again. Eventually, the chase process is performed twice (steps S2 to S4 and steps S11 to S13). However, it takes time to move the reading position to the recording layer.

  The present invention has been made in view of such a situation. When there is a track to be read next (that is, a track having a target sector) in a recording layer different from the recording layer at the current reading position, the reading position is determined. Is moved to a recording layer having a track to be read next, and the reading position is moved to a track to be read next, so that the reading position can be moved to another recording layer in a short time. It is to make.

  The reproducing apparatus of the present invention includes a reading means for reading data from a predetermined track of a predetermined recording layer of an optical disc, a first driving means for moving a reading position by the reading means in parallel with the recording layer, and a reading position by the reading means. A second driving means for moving the recording medium from one recording layer to the other recording layer, a control means for controlling the first and second driving means, and during reproduction of the optical disc, The first determination means for determining whether the address to be read is in a recording layer different from the recording layer at the current reading position, and the address of the recording layer at the current reading position is from the outer peripheral side of the optical disc Second determining means for determining whether or not the assignment is made toward the inner peripheral side, and the control means uses the first determining means to determine whether the next read address is the current read position. When it is determined that the recording layer is different from a certain recording layer, and the second determination means assigns the address of the recording layer at the current reading position from the outer peripheral side to the inner peripheral side of the optical disc. When the current read address is bit-inverted, the address corresponding to the recording layer with the next read address is calculated, and the number of moving tracks is calculated from this address and the next read address. When the first determination means determines that the next read address is in a recording layer different from the recording layer where the current read position is, and the second determination means records the current read position. When it is determined that the layer address is not assigned from the outer peripheral side to the inner peripheral side of the optical disc, the currently read address is read next. The second driving means is used to calculate the number of moving tracks from this address and the address to be read next, and move the reading position to the recording layer having the address to be read next. After the control, the first driving means is controlled to move the calculated number of movement tracks, and the reading means reads and reproduces data from the reading position controlled by the control means.

  The control means may control the first driving means so as to move the read position by the calculated number of moving tracks in a state where the servo control of the second driving means is stopped.

  The control means sets the servo control of the spindle motor for rotating the optical disk included in the first drive means to rough servo before controlling the second drive means, and controls the first drive means to read the reading position. Can be moved by the calculated number of movement tracks, and then the phase servo control of the spindle motor can be resumed.

  The reproducing method of the present invention includes a first determination step for determining whether or not an address to be read next is in a recording layer different from a recording layer having a current reading position during reproduction of an optical disc, A second determination step for determining whether or not the address of the recording layer where the position is located is assigned from the outer peripheral side to the inner peripheral side of the optical disc, and the address to be read next is processed by the processing of the first determination step. When it is determined that the recording layer is different from the recording layer with the current reading position, and the processing of the second determination step, the address of the recording layer with the current reading position is When it is determined that the address is assigned toward the inner circumference, the current read address bit-inverted corresponds to the recording layer with the next read address. The number of moving tracks is calculated from this address and the address to be read next, and the address to be read next is in a recording layer different from the recording layer at the current reading position by the processing of the first determination step. If it is determined, and the processing of the second determination step determines that the address of the recording layer at the current reading position is not assigned from the outer peripheral side to the inner peripheral side of the optical disc, The read address is the address corresponding to the recording layer with the next read address, the calculation step for calculating the number of moving tracks from this address and the next read address, and the read position is the record with the next read address. After controlling to move to the layer, move by the number of moving tracks calculated by the processing of the calculation step And Gosuru control step, a controlled read position by the processing of the control step, characterized in that it comprises a reproduction step of reproducing read data.

  In the present invention, during reproduction of the optical disc, when it is determined that the next read address is in a recording layer different from the recording layer at the current read position, and the address of the recording layer at the current read position Is determined to be assigned from the outer peripheral side to the inner peripheral side of the optical disc, and the address currently being read is bit-inverted as the address corresponding to the recording layer with the next read address. The number of moving tracks is calculated from the address and the next read address. If it is determined that the next read address is in a recording layer different from the recording layer where the current read position is, and the current read position exists When it is determined that the address of the recording layer is not assigned from the outer peripheral side to the inner peripheral side of the optical disc, The number of moving tracks is calculated from this address and the next read address, and the read position is moved to the recording layer with the next read address. Thereafter, the movement is controlled by the calculated number of movement tracks, and data is read and reproduced from the controlled reading position.

  As described above, according to the present invention, the reading position can be moved to another recording layer in a short time.

  FIG. 1 shows a configuration example of a first embodiment of a playback apparatus of the present invention. The optical pickup 1 (reading means) adjusts the distance of the built-in objective lens (not shown) from the optical disk 101 in accordance with a control signal supplied from the servo controller 7 (control means), while maintaining a predetermined track on the optical disk 101. Are irradiated with laser light, the reflected light is photoelectrically converted, and the converted RF signal is output to the demodulation circuit 2.

  The demodulating circuit 2 binarizes the RF signal supplied from the optical pickup 1, further performs error correction, and then outputs the reproduced digital data to the sector address detecting circuit 3.

  The sector address detection circuit 3 extracts, from the supplied digital data, the address of the sector in which the digital data is recorded, that is, the address Sc of the sector where the optical pickup 1 is currently reading the data. The address is output to the system controller 6 (control means), and the supplied digital data is output to the signal processing circuit 4.

  The signal processing circuit 4 performs predetermined processing (for example, decompression of compressed data) on the supplied digital data, and outputs the processed data to the data output circuit 5.

  Further, for example, when multiplexed data is recorded on the optical disc 101, the signal processing circuit 4 selects and selects one of the multiplexed data according to a predetermined setting. The data address (sector address) is output to the system controller 6.

  The data output circuit 5 is controlled by the system controller 6 and outputs data supplied from the signal processing circuit 4 to a predetermined circuit (not shown).

  The system controller 6 sends the drive system (spindle motor 8, thread motor) to the servo controller 7 in accordance with the sector address Sc supplied from the sector address detection circuit 3 and a signal supplied from the input unit 10 and corresponding to the setting by the user. 9 (first driving means) and the like.

  The servo controller 7 controls the spindle motor 8 to rotate the optical disc 101 so that the linear velocity at the reading position becomes a preset speed, and at the reading position instructed by the system controller 6, the optical pickup 1. The sled motor 9 is controlled so as to be arranged.

  The servo controller 7 controls an actuator (not shown) to perform tracking servo of the optical pickup 1.

  FIG. 2 shows a configuration example of the optical pickup 1.

  The laser diode (LD) 21 generates laser light having a predetermined wavelength and makes the laser light enter the collimator lens 22.

  The collimator lens 22 adjusts the laser beam incident from the LD 21 into a parallel beam, and causes the laser beam to enter the beam splitter (BS) 23.

  The BS 23 transmits parallel light incident from the collimator lens 22 toward the objective lens 24, and allows parallel light (described later) incident from the objective lens 24 to enter the collimator lens 25.

  The objective lens 24 is adjusted in distance to the optical disk 101 by a focus actuator 27 (second driving means), and condenses parallel light incident from the BS 23 onto a predetermined recording layer of the optical disk 101 and is incident from the optical disk 101. The returning light (reflected light from the recording layer of the optical disc 101) is adjusted to parallel rays and made incident on the BS 23.

  The collimator lens 25 condenses the parallel light incident from the BS 23 on a predetermined light receiving portion of the photo detector (PD) 26.

  The PD 26 has a light receiving portion having a predetermined shape, receives return light from the optical disc 101, performs photoelectric conversion, and outputs an electrical signal corresponding to the return light to the arithmetic circuit 28.

  The focus actuator 27 adjusts the distance of the objective lens 24 from the optical disc 101 in response to a signal from the servo controller 7.

  The arithmetic circuit 28 processes the electrical signal supplied from the PD 26, extracts the RF signal and servo information, outputs the RF signal to the demodulation circuit 2, and outputs the servo information to the servo controller 7. Yes.

  Next, the operation of the playback apparatus of FIG. 1 when moving the reading position will be described with reference to the flowchart of FIG.

  First, in step S21, the system controller 6 determines whether the sector to be read next from the sector address St of the sector to be read next and the address Sc of the current sector is in a recording layer different from the recording layer at which the current reading position is located. If it is determined that the sector to be read next is in a recording layer different from the recording layer at which the current reading position is present, in step S22, the servo motor 7 is caused to rotate the optical disc 101 in the servo controller 7. In step S23, the servo control (thread servo) of the sled motor 9 and the tracking servo of the optical pickup 1 are stopped.

  In step S24, the system controller 6 causes the servo controller 7 to control the focus actuator 27 and changes the distance between the objective lens 24 of the optical pickup 1 and the optical disc 101 as shown in FIG. That is, the focus position is jumped to a predetermined recording layer.

  Next, in step S25, the system controller 6 instructs the servo controller 7 to resume servo control of the sled motor 9 and tracking servo of the optical pickup 1.

  In step S26, the system controller 6 is supplied with the sector address and layer information reproduced from the optical disc 101 from the sector address detection circuit 3 and the signal processing circuit 4. In step S10, the system controller 6 currently reads from the layer information. It is determined whether or not the recording layer having the position is a recording layer having the target sector, and when it is determined that the recording layer having the reading position is not the recording layer having the target sector, the process returns to step S22. In steps S22 to S27, the focus position change is repeated until the reading position is set in the recording layer having the target sector.

  If the system controller 6 determines in step S27 that the read position is set in the recording layer having the target sector, the process proceeds to step S28.

  On the other hand, if the system controller 6 determines in step S21 that the current read position is set to the recording layer having the target sector, it skips steps S22 to S27 and proceeds to step S28.

  In step S28, the system controller 6 calculates the number of moving tracks from the address St of the sector to be read next and the address Sc of the current sector in the recording layer having the sector to be read next.

  In step S29, the system controller 6 determines whether or not the number of moving tracks is 0. If the system controller 6 determines that the number of moving tracks is not 0, the servo controller 7 controls the sled motor 9 in step S30. Then, after performing the track jump (movement of the reading position) by the number of movement tracks, the process returns to step S26.

  In this manner, the track jump is repeated until the read position moves to the target sector in steps S26 to S30.

  When the read position is set to the target sector, the process proceeds to step S31, and the system controller 6 causes the servo controller 7 to resume servo control of the phase of the spindle motor 8.

  As described above, the reading position is moved. At this time, as shown in FIG. 5, when the next sector to be read is in another recording layer, the read position is moved to the other recording layer by first changing the focus position to that recording layer. Next, in the recording layer having the target sector, the reading position is moved to the target sector.

  Next, a second embodiment of the present invention will be described. In the second embodiment, as the optical disc 101, a DVD in which the address in one of the two recording layers is assigned from the outer peripheral side to the inner peripheral side can be reproduced. ing. In such a DVD, the addresses of the corresponding sectors of the two recording layers (sectors on the same normal line of the two recording layers) are set to bit-inverted ones.

  Furthermore, in the second embodiment, the control by the system controller 6 is only changed as will be described later, and the description of the configuration is omitted.

  Next, the operation of the second embodiment when moving the reading position will be described with reference to the flowchart of FIG.

  First, in step S41, the system controller 6 determines whether the sector to be read next from the sector address St of the sector to be read next and the address Sc of the current sector is in a recording layer different from the recording layer at which the current reading position is located. If it is determined that the sector to be read next is in a recording layer different from the recording layer where the current reading position is, the process proceeds to step S42.

In step S42, the system controller 6 uses the address Sc of the current sector to which the recording layer where the reading position is currently assigned is assigned from the outer peripheral side toward the inner peripheral side (Opposite Track Path: Opposite Track Path). If it is determined that the address of the recording layer at which the reading position is currently allocated is assigned from the outer peripheral side to the inner peripheral side, the address of the current sector is determined in step S43. An address obtained by bit-reversing Sc, that is, an address of a recording layer sector corresponding to the current sector and having a target sector is calculated.

  On the other hand, when the system controller 6 determines in step S42 that the recording layer at the current reading position has not been assigned an address from the outer peripheral side toward the inner peripheral side, step S43 is skipped.

  Next, in step S44, when the recording layer at the current reading position is not the opposite track path, the system controller 6 determines the reading position of the optical pickup 1 from the address St of the target sector and the address Sc of the current sector. The number of moving tracks to be moved is calculated. When the recording layer at the current reading position is an opposite track path, the number of moving tracks is calculated from the address St of the target sector and the sector address Sc obtained by bit-inversion.

  In step S45, the system controller 6 causes the servo controller 7 to set the control of the spindle motor that rotates the optical disc 101 to rough servo, and in step S46, the servo control of the sled motor 9 and the optical pickup 1 are controlled. Stop the tracking servo.

  Next, in step S47, the system controller 6 instructs the servo controller 7 to change the distance between the objective lens 24 of the optical pickup 1 and the optical disc 101 as shown in FIG. The focus position is jumped to a predetermined recording layer.

  Further, in step S48, the system controller 6 causes the servo controller 7 to control the sled motor 9, and moves the optical pickup 1 by the number of movement tracks calculated in step S44 while the sled servo and tracking servo are stopped.

  In step S49, the system controller 6 instructs the servo controller 7 to restart the servo control of the sled motor 9 and the tracking servo of the optical pickup 1.

  Next, in step S50, the system controller 6 is supplied with the sector address and layer information reproduced from the optical disc 101 from the sector address detection circuit 3 and the signal processing circuit 4, and in step S51, from the layer information, When it is determined whether the recording layer having the reading position is a recording layer having the target sector, and when it is determined that the recording layer having the reading position is not the recording layer having the target sector, the process returns to step S42. In steps S42 to S51, the focus position change is repeated until the reading position is set in the recording layer having the target sector.

  If the system controller 6 determines in step S51 that the read position is set to the recording layer having the target sector, the system controller 6 proceeds to step S52.

  On the other hand, if the system controller 6 determines in step S41 that the current read position is set in the recording layer having the target sector, it skips steps S42 to S51.

  Next, in step S52, the system controller 6 calculates the number of moving tracks from the address St of the next sector to be read and the address Sc of the current sector in the recording layer having the sector to be read next.

  In step S53, the system controller 6 determines whether or not the number of moving tracks is 0. If the system controller 6 determines that the number of moving tracks is not 0, the servo controller 7 controls the sled motor 9 in step S54. After performing the track jump for the number of moving tracks, the process returns to step S50.

  Thus, the track jump is repeated until the read position moves to the target sector in steps S50 to S54.

  When the read position is set to the target sector, the process proceeds to step S55, and the system controller 6 causes the servo controller 7 to resume the servo control of the phase of the spindle motor 8.

  As described above, the reading position is moved. In the second embodiment, the focus position is changed and the track jump is performed with the sled servo and tracking servo stopped.

  In the above embodiment, the dual layer DVD is used as the optical disc 101. However, the present invention is not particularly limited to the dual layer DVD.

  In the above embodiment, the optical disc 101 having two recording layers is reproduced. However, the optical disc 101 having three or more recording layers can be reproduced in the same manner.

It is a block diagram which shows the structural example of 1st Embodiment of the reproducing | regenerating apparatus of this invention. It is sectional drawing which shows one structural example of an optical pick-up. 2 is a flowchart for explaining the operation of the playback apparatus of FIG. 1 when moving a data read position. It is sectional drawing which shows the example of a change of a focus position. It is sectional drawing which shows the example of the movement of the reading position of the data to another recording layer. It is a flowchart explaining operation | movement of 2nd Embodiment when moving the reading position of data. It is a flowchart explaining an example of a movement of the reading position of data. It is sectional drawing which shows the example of the movement of the reading position of the data to another recording layer.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Optical pickup, 2 Demodulation circuit, 3 Sector address detection circuit, 4 Signal processing circuit, 5 Data output circuit, 6, System controller, 7 Servo controller, 8 Spindle motor, 9 Thread motor, 24 Objective lens, 27 Focus actuator, 101 optical disk

Claims (4)

In a playback apparatus for playing back an optical disc composed of a plurality of recording layers,
Reading means for reading data from a predetermined track of a predetermined recording layer of the optical disc;
First driving means for moving a reading position by the reading means in parallel with the recording layer;
Second driving means for moving a reading position by the reading means from one recording layer of the plurality of recording layers to another recording layer;
Control means for controlling the first and second drive means;
A first determination means for determining whether an address to be read next is in a recording layer different from a recording layer in which the current reading position is located during reproduction of the optical disc;
Second determination means for determining whether or not the address of the recording layer at which the current reading position is located is assigned from the outer peripheral side to the inner peripheral side of the optical disc;
The control means includes
When it is determined by the first determination means that the next read address is in a recording layer different from the recording layer where the current reading position is, and the current reading is performed by the second determination means. When it is determined that the address of the recording layer where the position is located is assigned from the outer periphery side to the inner periphery side of the optical disc, there is an address to which the current read address is bit-inverted and then read next The address corresponding to the recording layer is calculated, and the number of moving tracks is calculated from this address and the address to be read next,
When it is determined by the first determination means that the next read address is in a recording layer different from the recording layer where the current reading position is, and the current reading is performed by the second determination means. When it is determined that the address of the recording layer where the position is located is not assigned from the outer peripheral side to the inner peripheral side of the optical disc, the currently read address corresponds to the recording layer with the next read address The number of moving tracks is calculated from this address and the address to be read next,
After controlling the second driving means to move the reading position to the recording layer having the address to be read next, the first driving means is controlled to move by the calculated number of moving tracks,
The reproducing apparatus reads and reproduces data from a reading position controlled by the control means. The control unit controls the first driving unit to move the read position by the calculated number of moving tracks in a state where the servo control of the second driving unit is stopped. The playback apparatus according to claim 1. The control means sets the servo control of the spindle motor that rotates the optical disk included in the first drive means to rough servo before controlling the second drive means, and controls the first drive means. Then, after the read position is moved by the calculated number of movement tracks, phase servo control of the spindle motor is resumed. In a playback method of a playback apparatus for playing back an optical disk composed of a plurality of recording layers,
A first determination step of determining whether or not an address to be read next is in a recording layer different from a recording layer having a current reading position during reproduction of the optical disc;
A second determination step of determining whether an address of the recording layer at which the current reading position is located is assigned from the outer peripheral side to the inner peripheral side of the optical disc;
When it is determined by the processing of the first determination step that the next read address is in a recording layer different from the recording layer at the current reading position, and by the processing of the second determination step, When it is determined that the address of the recording layer where the current read position is located is assigned from the outer peripheral side to the inner peripheral side of the optical disc, An address corresponding to a recording layer having an address to be read out is calculated, and the number of moving tracks is calculated from this address and the address to be read next. By the processing of the first determination step, the address to be read next is the current reading position. When it is determined that the recording layer is different from a certain recording layer, and the current reading is performed by the processing of the second determination step. When it is determined that the address of the recording layer where the position is located is not assigned from the outer peripheral side to the inner peripheral side of the optical disc, the currently read address corresponds to the recording layer with the next read address A calculation step for calculating the number of moving tracks from this address and the address to be read next;
A control step of controlling the reading position to be moved to the recording layer having an address to be read next, and then moving the reading position by the number of moving tracks calculated by the calculation step;
A reproducing step of reading and reproducing data from a reading position controlled by the processing of the control step.

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