JP2008159127A - Optical disk drive - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk drive which can shorten start time and perform stable reproduction. <P>SOLUTION: When a disk is inserted in the optical disk drive, a microcomputer 8 starts a focus servo and tracking servo using a default value. Then the microcomputer 8 sequentially stores reproduced data in a track buffer 8a, and sequentially sends out reproduced data to a back-end 9 from the track buffer 8a. When the track buffer 8a becomes full, the microcomputer 8 adjusts focus servo and starts focus servo based on this adjusting result. In another time when the track buffer 8a becomes full, the microcomputer 8 adjusts tracking servo and starts tracking servo operation based on this adjusting result for every area divided into a concentric shape defined on the disk. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an optical disc apparatus.

  2. Description of the Related Art Conventionally, there has been developed an optical disc apparatus that performs servo adjustment in order to stabilize reproduction by absorbing variations in optical pickup characteristics and disk characteristics (see, for example, Patent Document 1 for servo adjustment).

As such an optical disk device, for example, when a disk is inserted into the optical disk device, servo adjustment is performed in a state where the optical pickup is located at the home position on the inner circumference side of the disk, and then servo is performed using the adjustment result. However, there are some that play back.
JP-A-10-334475

  However, in the above conventional optical disk apparatus, since the servo adjustment is performed during the starting operation, the starting time becomes long, and the result of adjusting only the inner circumference of the disk is used for reproduction in the entire data area of the disk, so that the reproduction stability is improved. There was a problem of getting worse.

  In view of the above problems, an object of the present invention is to provide an optical disc apparatus capable of shortening the startup time and performing more stable reproduction.

In order to achieve the above object, an optical disc apparatus according to the present invention includes an optical pickup, a focus servo unit that performs focus servo, a tracking servo unit that performs tracking servo, a servo adjustment unit that performs at least one type of servo adjustment, a track A buffer; storage means for sequentially storing reproduction data based on a signal read from the disk by the optical pickup in the track buffer; and transmission means for sequentially transmitting the reproduction data stored in the track buffer to a back end. In the optical disc device
When the disc is inserted into the optical disc apparatus, the focus servo means starts focus servo based on a predetermined initial set value, and the tracking servo means starts tracking servo based on a predetermined initial set value,
Then, for each concentrically divided area defined on the disk,
The storage means sequentially stores the reproduction data based on the signal read from the disk by the optical pickup in the track buffer, the sending means sequentially sends the reproduction data stored in the track buffer to the back end, and the track The servo adjustment means performs at least one kind of servo adjustment at least once when the reproduction data is stored in the buffer to its full capacity, and based on the adjustment result, the focus servo means performs focus servo, and / or The tracking servo means performs tracking servo based on the adjustment result.

  According to such a configuration, since the servo adjustment is not performed during the start-up operation, the start-up time can be shortened, and the servo adjustment is performed for each divided area defined on the disk, so that the disk characteristics can be grasped in detail. More stable reproduction can be performed.

  The optical disk apparatus according to the present invention may have at least one kind of servo related to the focus servo in one of two times when the reproduction data is stored in the track buffer to the full capacity. The focus servo means performs focus servo based on the adjustment result, and at the other time, the servo adjustment means performs at least one type of servo adjustment related to tracking servo, and the tracking servo means based on the adjustment result Is characterized by tracking servo.

  According to such a configuration, servo adjustment is performed in two steps, so that one servo adjustment time can be shortened, and even if the track buffer capacity is small, all reproduction data is transmitted during servo adjustment and reproduction is interrupted. You can prevent such things.

Moreover, the optical disc apparatus of the present invention further includes a learning storage unit in which the adjustment result is stored for each region in the above configuration,
When a predetermined operation is performed in the operation means and the objective lens of the optical pickup moves to a position corresponding to the area where servo adjustment has already been performed, which is different from the current area, the storage means stores the optical pickup in the optical pickup. The reproduction data based on the signal read from the disc is sequentially stored in the track buffer, and the sending means sequentially sends the reproduction data stored in the track buffer to the back end, and the capacity is first stored in the track buffer after the movement. When the reproduction data is fully stored, the focus servo means performs focus servo based on the adjustment result stored in the learning storage unit corresponding to the current area, and / or the current corresponding to the current area. The tracking servo means is based on the adjustment result stored in the learning storage unit. It is characterized by performing the Tsu King servo.

  According to such a configuration, even when the track search operation is performed by the user and the area to be reproduced is changed, stable reproduction can be continued using the result of adjustment once.

  According to the optical disk apparatus of the present invention, it is possible to shorten the startup time and perform more stable reproduction.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows a schematic configuration diagram of an optical disc apparatus according to the present invention. An optical disk apparatus according to the present invention includes a spindle motor 1, an optical pickup 2, an RF amplifier 3, a thread motor 4, a motor driver 5, a focus actuator driver 6, a tracking actuator driver 7, a microcomputer 8, a back And an end 9. The microcomputer 8 includes a track buffer 8a, a setting storage unit 8b, a learning storage unit 8c, an area number storage unit 8d, and an initial set value storage unit 8e.

  The spindle motor 1 is a motor for rotating the disk, and is driven by the microcomputer 8. The optical pickup 2 includes a laser diode (not shown), an objective lens, a tracking actuator, a focus actuator, and a photodetector. The laser beam emitted from the laser diode is condensed on the disk by the objective lens, the laser beam reflected by the disk is received by the photodetector, converted into an electrical signal, and output to the RF amplifier 3. The RF amplifier 3 generates an RF signal, a focus error signal, and a tracking error signal based on the electrical signal output from the optical pickup 2 and outputs them to the microcomputer 8.

  The microcomputer 8 generates reproduction data based on the RF signal, and stores the generated reproduction data in the track buffer 8a.

  Further, the microcomputer 8 corrects the focus error signal using the setting values of the focus offset value, the focus balance value, and the focus gain value stored in the setting storage unit 8b, and generates a drive signal based on the corrected focus error signal. The drive signal is output to the focus actuator driver 6. The focus actuator driver 6 drives the focus actuator of the optical pickup 2 based on the drive signal, the objective lens of the optical pickup 2 is driven in the direction perpendicular to the disk surface, and focus servo is performed.

  Further, the microcomputer 8 corrects the tracking error signal using the tracking offset value, tracking balance value, and tracking gain value stored in the setting storage unit 8b, and generates a drive signal based on the corrected tracking error signal. Then, the drive signal is output to the tracking actuator driver 7. The tracking actuator driver 7 drives the tracking actuator of the optical pickup 2 based on the drive signal, the objective lens of the optical pickup 2 is driven in the radial direction of the disk surface, and tracking servo is performed.

  Further, the microcomputer 8 outputs a drive signal to the motor driver 5, and the motor driver 5 drives the sled motor 4 based on the drive signal, and the optical pickup 2 moves in the radial direction of the disk surface by driving the sled motor 4. The microcomputer 8 controls the movement of the objective lens to the target address by driving control of the tracking actuator or by driving control of the tracking actuator and the sled motor 4.

  The back end 9 includes a video / audio decoding unit and a video / audio output unit, and communicates with the microcomputer 8.

  The reproduction operation in the optical disc apparatus according to the present invention having such a configuration will be described below with reference to the flowcharts of FIGS.

  When the disc is inserted into the optical disc apparatus, the type of the disc into which the microcomputer 8 has been inserted is determined using the optical pickup 2 in step S200 (FIG. 2). At this time, the optical pickup 2 is located at the home position on the inner periphery side of the disc.

  Here, the initial setting value storage unit 8e of the microcomputer 8 has initial setting values of a focus offset value, a focus balance value, a focus gain value, a tracking offset value, a tracking balance value, and a tracking gain value for each disc type. Stored in advance. These are the results of investigating optimum values for various discs in actual equipment in the development stage of the optical disc apparatus.

  After step S200, in step S201, the microcomputer 8 stores, in the setting storage unit 8b, the initial setting values corresponding to the disc type determined in step S200 among the initial setting values stored in the initial setting value storage unit 8e. Remember.

  Here, as shown in FIG. 5, areas divided concentrically at predetermined distances from the outer edge of the center hole to the outer circumferential direction on the disk are defined in advance for each disk type. An area number starting from is added. After step S201, in step S202, the microcomputer 8 determines the focus offset value, the focus balance value, the focus gain value, the tracking offset value, and the tracking balance value for each area having the number of areas corresponding to the disc type determined in step S200. In the learning storage unit 8c, an area in which each learning value of the tracking gain value, a focus servo learning flag indicating presence / absence of focus servo learning, and a tracking servo learning flag indicating presence / absence of tracking servo learning can be stored. Then, the microcomputer 8 causes the learning storage unit 8c to store a flag indicating no learning as each focus servo learning flag and each tracking servo learning flag corresponding to all areas.

  In step S203, the microcomputer 8 turns on the focus servo, and in step S204, the microcomputer 8 turns on the tracking servo. In step S205, the microcomputer 8 confirms each servo state based on the focus error signal and the tracking error signal. As a result, if neither the focus servo nor the tracking servo is off (N in Step S206), the process proceeds to Step S213. If at least one of the focus servo and tracking servo is out (Y in step S206), the microcomputer 8 turns off the servo if there is a servo that has not been removed, and proceeds to step S207. The case of proceeding to step S207 will be described later.

  In step S213, the microcomputer 8 controls the movement of the objective lens to a position corresponding to the management information area on the disc (located on the inner circumference side of the disc), and backs up the management information based on the signal read from the disc by the optical pickup 2. Send to end 9. Then, when the back end 9 indicates an address belonging to the data area (located on the outer circumference side of the disc from the management information area) and requests the reproduction data from the microcomputer 8, the process proceeds to step S300 in FIG.

  In step S300 (FIG. 3), the microcomputer 8 confirms each servo state based on the focus error signal and the tracking error signal. As a result, when neither the focus servo nor the tracking servo is off (N in Step S301), the process proceeds to Step S312. If at least one of the focus servo and the tracking servo is out (Y in step S301), the microcomputer 8 turns off the servo if there is a servo that is not out, and proceeds to step S302. The case of proceeding to step S302 will be described later.

  In step S312, the microcomputer 8 confirms the state of the track buffer 8a. If reproduction data is not stored in the capacity of the track buffer 8a (hereinafter referred to as buffer full) (N in step S313), the process proceeds to step S314.

  In step S314, the microcomputer 8 controls the movement of the objective lens to a position corresponding to the address designated by the back end 9 on the disk. In step S315, the microcomputer 8 stores the reproduction data based on the signal read from the disk by the optical pickup 2 in the track buffer 8a. The reproduction data stored in the track buffer 8a is sent to the back end 9 by the microcomputer 8. Thereafter, the microcomputer 8 sequentially sends the reproduction data at the address designated by the back end 9 from the track buffer 8a to the back end 9.

  Then, returning to step S300 and proceeding to steps S301, S312, and S313 in the same manner as described above, in step S314, the microcomputer 8 positions the objective lens at a position corresponding to the address next to the address of the reproduction data that is the latest acquisition target. In step S315, the reproduction data is stored in the track buffer 8a. Thereafter, the same operation is repeated.

  As described above, by repeating the steps S300, S301, S312, S313, S314, and S315, the reproduction data is sequentially stored in the track buffer 8a. During this time, the reproduction data at the address designated by the back end 9 is sequentially sent from the track buffer 8a to the back end 9 by the microcomputer 8, but the speed stored in the track buffer 8a is from the track buffer 8a to the back end 9. Since it is faster than the transmission speed, the reproduction data is accumulated in the track buffer 8a over time.

  Then, at step S315 at a certain point in time, the reproduction data is stored to the full capacity of the track buffer 8a, and when the microcomputer 8 confirms the state of the track buffer 8a in step 312, the buffer full is confirmed (Y in step S313). The process proceeds to step S400 of step 4.

  In step S400 (FIG. 4), the microcomputer 8 searches for the area number corresponding to the address of the reproduction data that is the latest acquisition target. As shown in FIG. 5, a predetermined address for dividing an area having an area number of m and an area having an area number of m + 1 is an area m division address, where the number of areas corresponding to the disc type determined in step S200 is n. If it is called (where m is a natural number between 1 and n-1), if the address of the most recently acquired reproduction data is less than or equal to the area 1 division address, 1 is retrieved as the area number and acquired most recently. If the address of the reproduced data is greater than the area k segment address and less than the area k + 1 segment address (where k is a natural number between 1 and n-2), k + 1 is searched as the area number, and the most recently acquired reproduction data If the address is larger than the area n-1 division address, n is retrieved as the area number.

  In step S401, the microcomputer 8 confirms whether the focus servo learning flag stored in the learning storage unit 8c corresponding to the area number searched in step S400 indicates learning or not, and indicates no learning. If so (N in step S401), the process proceeds to step S402.

  In step S402, the microcomputer 8 stores the area number searched in step S400 in the area number storage unit 8d and updates the area number.

  In step S <b> 403, the microcomputer 8 turns off the focus servo and tracking servo, and adjusts the focus offset value, the focus balance value, and the focus gain value using the optical pickup 2. In step S404, the microcomputer 8 stores the adjusted focus offset value, focus balance value, and focus gain value in the learning storage unit 8c as learning values corresponding to the area numbers searched in step S400, and the learning storage unit The focus servo learning flag corresponding to the area number stored in 8c is updated with learning.

  In step S405, the microcomputer 8 stores the focus offset value, the focus balance value, and the focus gain value adjusted in step S403 in the setting storage unit 8b and updates the setting value. In step S415, the microcomputer 8 turns on the focus servo and tracking servo.

  Next, in step S416, the microcomputer 8 reduces the reproduction data stored in the track buffer 8a to a predetermined amount (for example, half the total capacity of the track buffer 8a) or less by sending data to the back end 9. If it has not been decreased (N in Step S416), the process proceeds to Step S417.

  In step S417, the microcomputer 8 starts a servo STILL process that is a process for controlling the position of the objective lens at a position corresponding to the address on the disc of the reproduction data that is the latest acquisition target. In step S418, when the capacity of the reproduction data accumulated in the track buffer 8a during the servo STILL process becomes equal to or smaller than a predetermined amount, the microcomputer 8 corresponds to the address next to the address of the reproduction data that is the latest acquisition target. Move the objective lens to the position. In step S420, the microcomputer 8 stores the reproduction data based on the signal read from the disk by the optical pickup 2 in the track buffer 8a. Thereafter, the process returns to step S300 in FIG.

  In step S416, if the volume of the reproduction data stored in the track buffer 8a has decreased to a predetermined amount or less (Y in step S416), the process proceeds to step S419, and the microcomputer 8 reproduces the reproduction object that is the latest acquisition target. The objective lens is controlled to move to a position corresponding to the next address of the data address. In step S420, the microcomputer 8 stores the reproduction data based on the signal read from the disk by the optical pickup 2 in the track buffer 8a. Thereafter, the process returns to step S300 in FIG.

  In step S401, the microcomputer 8 confirms whether the focus servo learning flag stored in the learning storage unit 8c corresponding to the area number searched in step S400 indicates learning or not, and indicates that learning is present. If so (Y in step S401), the process proceeds to step S406.

  In step S406, the microcomputer 8 confirms whether the tracking servo learning flag stored in the learning storage unit 8c corresponding to the area number searched in step S400 indicates whether learning is present or not. If (N in Step S406), the process proceeds to Step S407.

  In step S407, the microcomputer 8 stores the area number searched in step S400 in the area number storage unit 8d and updates the area number.

  In step S408, the microcomputer 8 turns off the tracking servo and adjusts the tracking offset value, the tracking balance value, and the tracking gain value using the optical pickup 2. In step S409, the microcomputer 8 stores the adjusted tracking offset value, tracking balance value, and tracking gain value in the learning storage unit 8c as a learning value corresponding to the area number searched in step S400, and the learning storage unit The tracking servo learning flag corresponding to the area number stored in 8c is updated with learning.

  In step S410, the microcomputer 8 stores the tracking offset value, tracking balance value, and tracking gain value adjusted in step S408 in the setting storage unit 8b and updates the setting value. In step S415, the microcomputer 8 turns on the tracking servo. Then, it progresses to step S416 mentioned above.

  In step S406, the microcomputer 8 confirms whether or not the tracking servo learning flag stored in the learning storage unit 8c corresponding to the area number searched in step S400 indicates whether learning is present or not. If so (Y in step S406), the process proceeds to step S411.

  In step S411, the microcomputer 8 compares the area number searched in step S400 with the area number stored in the area number storage unit 8d. If they are the same (N in step S411), the microcomputer 8 proceeds to step S412. If both are different (Y in step S411), the process proceeds to step S413.

  In step S412, the microcomputer 8 stores the area number searched in step S400 in the area number storage unit 8d and updates the area number. Then, it progresses to step S416 mentioned above.

  In step S413, the microcomputer 8 stores the area number searched in step S400 in the area number storage unit 8d and updates the area number. In step S414, the microcomputer 8 selects the focus offset value, the focus balance value, the focus gain value, the tracking offset value, the tracking balance value, the tracking stored in the learning storage unit 8c corresponding to the area number searched in step S400. Each learning value of the gain value is stored in the setting storage unit 8b as a setting value, and the setting value is updated. Then, it progresses to step S416 mentioned above.

  With this operation, the disc is reproduced as follows. After the start-up operation shown in FIG. 2, the operations in the order of steps S300, S301, S312, S313, S314, and S315 are repeated, and the reproduction data is accumulated in the track buffer 8a. When the buffer becomes full (Y in step S313), Proceed to step S400. In step S400, area number 1 is searched, and the focus servo learning flag corresponding to area number 1 indicates no learning (N in step S401), so the process proceeds to step S402. In step S402, area number 1 is stored in the area number storage unit 8d, focus servo adjustment is performed in step S403, and the adjustment result is stored in the learning storage unit 8c as a learning value corresponding to area number 1 in step S404. Then, the focus servo learning flag corresponding to the area number 1 is updated with learning. In step S405, the adjustment result is stored in the setting storage unit 8b. Thereafter, the reproduction data is acquired in step S420, the process returns to step S300, and the operations in the order of steps S300, S301, S312, S313, S314, and S315 are repeated. Thus, the reproduction data is stored again in the track buffer 8a.

  When the buffer is full (Y in step S313), the process proceeds to step S400, where area number 1 is searched again. Here, since the focus servo learning flag corresponding to area number 1 indicates learning (Y in step S401), the process proceeds to step S406. Here, since the tracking servo learning flag corresponding to area number 1 indicates no learning (N in step S406), the process proceeds to step S407. In step S407, area number 1 is stored in the area number storage unit 8d, tracking servo adjustment is performed in step S408, and the adjustment result is stored in the learning storage unit 8c as a learning value corresponding to area number 1 in step S409. Then, the tracking servo learning flag corresponding to the area number 1 is updated with learning. In step S410, the adjustment result is stored in the setting storage unit 8b. Thereafter, the reproduction data is acquired in step S420, the process returns to step S300, and the operations in the order of steps S300, S301, S312, S313, S314, and S315 are repeated. Thus, the reproduction data is stored again in the track buffer 8a.

  When the buffer is full (Y in step S313), the process proceeds to step S400, where area number 1 is searched again. Here, since both the focus servo learning flag and the tracking servo learning flag corresponding to area number 1 indicate that learning is present (Y in step S401, Y in step S406), the process proceeds to step S411. Here, since the area number searched in step S400 is the same as the area number stored in the area number storage unit 8d and area number 1 (N in step S411), the process proceeds to step S412. After the area number 1 is stored in the area number storage unit 8d in step S412, the reproduction data is acquired in step S420, the process returns to step S300, and thereafter the same is repeated and the reproduction in the area of area number 1 proceeds. .

  When the objective lens reaches the area of area number 2 and becomes buffer full (Y in step S313), area number 2 is searched in step S400. Thereafter, as in the case of area number 1, focus servo adjustment is first performed, then tracking servo adjustment is performed, and reproduction in the area of area number 2 proceeds. Thereafter, reproduction proceeds while the focus servo adjustment and the tracking servo adjustment are performed for the remaining defined areas.

  As described above, in the present invention, the start operation is performed without performing the focus servo adjustment and the tracking servo adjustment, and the servo adjustment is performed for each area on the disk during reproduction to grasp the disk characteristics in detail, thereby shortening the start time. In addition, the reproduction can be performed more stably. In addition, since the focus servo adjustment and the tracking servo adjustment are performed in two steps, the time required for one servo adjustment is short, and even if the capacity of the track buffer 8a is small, all the reproduction data from the track buffer 8a can be obtained during the servo adjustment. It is possible to prevent the playback from being interrupted by being sent to the back end 9.

  Further, when an operation for cueing an arbitrary track is performed with a remote controller (not shown) during reproduction, the back end 9 instructs an address corresponding to the operation to request reproduction data from the microcomputer 8. Then, the microcomputer 8 discards the reproduction data stored in the track buffer 8a, controls the movement of the objective lens to the position corresponding to the instructed address, stores the reproduction data in the track buffer 8a, and proceeds to step S300. Further, the microcomputer 8 sequentially transmits the reproduction data at the address designated by the back end 9 from the track buffer 8 a to the back end 9.

  For example, after the start operation, focus servo adjustment and tracking servo adjustment have been completed for area number 1, and focus servo adjustment and tracking servo adjustment have been completed for area number 2, and then the remote controller can re-track the track of area number 2 during playback of area number 2. When a cueing operation is performed and an address belonging to the area of area number 1 is designated from the back end 9, the microcomputer 8 discards the reproduction data accumulated in the track buffer 8a and reaches a position corresponding to the designated address. The movement of the objective lens is controlled, the reproduction data is stored in the track buffer 8a, and the process proceeds to step S300. Then, the operations in the order of steps S300, S301, S312, S313, S314, and S315 are repeated, and the reproduction data is accumulated in the track buffer 8a. When the buffer becomes full (Y in step S313), the process proceeds to step S400. In step S400, area number 1 is retrieved, and focus servo adjustment and tracking servo adjustment have been completed for area number 1 (Y in step S401, Y in step S406), so the process proceeds to step S411. Here, since the area number stored in the area number storage unit 8d is 2, which is different from the area number 1 searched in step S400 (Y in step S411), the process proceeds to step S413. In step S413, area number 1 is stored in the area number storage unit 8d. In step S414, each learning value corresponding to the area number 1 is stored in the setting storage unit 8b, and the setting value is updated. Thereafter, playback in the area of area number 1 proceeds. As described above, in the present invention, even if the area to be reproduced is changed by the track cuing operation by the user, the learning value for the area after the change is reflected in the set value, so that stable reproduction can be continued.

  Further, if each servo state is confirmed in step S205 in FIG. 2 and at least one of the focus servo and tracking servo is out (Y in step S206), the microcomputer 8 selects the servo that is not out. Turn off and proceed to step S207.

  In step S207, the microcomputer 8 uses the optical pickup 2 to adjust the focus offset value, the focus balance value, and the focus gain value. In step S208, the microcomputer 8 stores each adjustment value in the setting storage unit 8b and sets the set value. Update. In step S209, the microcomputer 8 turns on the focus servo.

  In step S210, the microcomputer 8 uses the optical pickup 2 to adjust the tracking offset value, tracking balance value, and tracking gain value. In step S211, the microcomputer 8 stores the adjustment values in the setting storage unit 8b and sets them. Update the value. In step S212, the microcomputer 8 turns on the tracking servo. Thereafter, the process returns to step S205, where each servo state is confirmed, and if none of the servos are disconnected (N in step S206), the process proceeds to step S213.

  As a result, even if the servo based on the initial setting value is unstable depending on the state of the disk, the reproduction is started after the servo adjustment is performed, so that the stable reproduction can be started.

  In addition, when each servo state is confirmed in step S300 of FIG. 3 and at least one of the focus servo and tracking servo is out (Y in step S301), the microcomputer 8 determines that there is a servo that is not out. Turn off and proceed to step S302.

  In step S302, the microcomputer 8 searches for the area number corresponding to the address of the reproduction data that is the latest acquisition target, stores the searched area number in the area number storage unit 8d, and updates the area number. The search method is the same as that in step S400 described above.

  In step S303, the microcomputer 8 confirms whether the focus servo learning flag stored in the learning storage unit 8c corresponding to the area number searched in step S302 indicates learning or not, and indicates no learning. If so (N in step S303), the process proceeds to step S304.

  In step S <b> 304, the microcomputer 8 uses the optical pickup 2 to adjust the focus offset value, the focus balance value, and the focus gain value. In step S305, the microcomputer 8 stores the adjusted focus offset value, focus balance value, and focus gain value in the learning storage unit 8c as learning values corresponding to the area numbers searched in step S302, and the learning storage unit The focus servo learning flag corresponding to the area number stored in 8c is updated with learning.

  In step S306, the microcomputer 8 stores the focus offset value, the focus balance value, and the focus gain value adjusted in step S304 in the setting storage unit 8b and updates the setting value. In step S311, the microcomputer 8 turns on the focus servo and tracking servo, and proceeds to step S312.

  In step S303, the microcomputer 8 confirms whether the focus servo learning flag stored in the learning storage unit 8c corresponding to the area number searched in step S302 indicates whether or not learning is present, and indicates that learning is present. If so (Y in step S303), the process proceeds to step S307.

  In step S307, the microcomputer 8 confirms whether the tracking servo learning flag stored in the learning storage unit 8c corresponding to the area number searched in step S302 indicates learning or not, and indicates that learning is not performed. If (N in Step S307), the process proceeds to Step S308.

  In step S308, the microcomputer 8 turns on the focus servo and adjusts the tracking offset value, the tracking balance value, and the tracking gain value using the optical pickup 2. In step S309, the microcomputer 8 stores the adjusted tracking offset value, tracking balance value, and tracking gain value in the learning storage unit 8c as the learning value corresponding to the area number searched in step S302, and the learning storage unit The tracking servo learning flag corresponding to the area number stored in 8c is updated with learning.

  In step S310, the microcomputer 8 stores the tracking offset value, tracking balance value, and tracking gain value adjusted in step S308 in the setting storage unit 8b and updates the setting value. In step S311, the microcomputer 8 turns on the tracking servo and proceeds to step S312.

  As a result, even when the servo at the initial setting value is unstable and the servo is lost during reproduction, the servo adjustment is performed, so that stable reproduction can be continued.

  In step S307, the microcomputer 8 confirms whether the tracking servo learning flag stored in the learning storage unit 8c corresponding to the area number searched in step S302 indicates learning or not, and indicates learning. If so (Y in step S307), the process proceeds to step S311 and the microcomputer 8 turns on the focus servo and tracking servo. Then, the process proceeds to step S312.

  Thus, even if the setting values of the focus servo and tracking servo are appropriate by adjustment, even if the servo is disconnected due to a large external force applied to the optical disk device, the servo is restored, so that reproduction can be continued.

These are the schematic block diagrams of the optical disk apparatus based on this invention. These are flowcharts regarding a starting operation. These are flowcharts regarding the reproduction operation. These are flowcharts regarding the reproduction operation. FIG. 4 is a diagram showing an area definition on a disk.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Spindle motor 2 Optical pick-up 3 RF amplifier 4 Thread motor 5 Motor driver 6 Focus actuator driver 7 Tracking actuator driver 8 Microcomputer 8a Track buffer 8b Setting memory | storage part 8c Learning memory | storage part 8d Area number memory | storage part 8e Initial setting value memory | storage part 9 Back end

Claims (4)

Based on an optical pickup, a focus servo means for performing focus servo, a tracking servo means for performing tracking servo, a servo adjusting means for performing at least one kind of servo adjustment, a track buffer, and a signal read from the disk by the optical pickup An optical disc apparatus comprising: storage means for sequentially storing reproduction data in the track buffer; and sending means for sequentially sending reproduction data stored in the track buffer to a back end, further comprising a learning storage unit,
When the disc is inserted into the optical disc apparatus, the focus servo means starts focus servo based on a predetermined initial set value, and the tracking servo means starts tracking servo based on a predetermined initial set value,
Then, for each concentrically divided area defined on the disk,
The storage means sequentially stores the reproduction data based on the signal read from the disk by the optical pickup in the track buffer, the sending means sequentially sends the reproduction data stored in the track buffer to the back end, and the track The servo adjustment means performs at least one kind of servo adjustment related to the focus servo at one of the two times when the reproduction data is stored in the buffer to the full capacity, and based on the adjustment result, the focus servo means Focus servo is performed, and at the other time, the servo adjustment unit performs at least one type of servo adjustment related to tracking servo, and the tracking servo unit performs tracking servo based on the adjustment result, and the adjustment result is stored in the learning storage unit. Are stored in memory. An optical disk apparatus as,
When a predetermined operation is performed in the operation means and the objective lens of the optical pickup moves to a position corresponding to the area where servo adjustment has already been performed, which is different from the current area, the storage means stores the optical pickup in the optical pickup. The reproduction data based on the signal read from the disc is sequentially stored in the track buffer, and the sending means sequentially sends the reproduction data stored in the track buffer to the back end, and the capacity is first stored in the track buffer after the movement. When the reproduction data is fully stored, the focus servo means performs focus servo based on the adjustment result stored in the learning storage unit corresponding to the current region, and the learning storage unit corresponding to the current region. Based on the adjustment results stored in the tracking servo means, the tracking servo means Optical disk apparatus and performs. Based on an optical pickup, a focus servo means for performing focus servo, a tracking servo means for performing tracking servo, a servo adjusting means for performing at least one kind of servo adjustment, a track buffer, and a signal read from the disk by the optical pickup In an optical disc apparatus comprising: storage means for sequentially storing reproduction data in the track buffer; and sending means for sequentially transmitting reproduction data stored in the track buffer to a back end.
When the disc is inserted into the optical disc apparatus, the focus servo means starts focus servo based on a predetermined initial set value, and the tracking servo means starts tracking servo based on a predetermined initial set value,
Then, for each concentrically divided area defined on the disk,
The storage means sequentially stores the reproduction data based on the signal read from the disk by the optical pickup in the track buffer, the sending means sequentially sends the reproduction data stored in the track buffer to the back end, and the track The servo adjustment means performs at least one kind of servo adjustment at least once when the reproduction data is stored in the buffer to its full capacity, and based on the adjustment result, the focus servo means performs focus servo, and / or An optical disc apparatus characterized in that the tracking servo means performs tracking servo based on the adjustment result.   The servo adjustment means performs at least one type of servo adjustment related to the focus servo at one of the two times when the reproduction data is stored in the track buffer to its full capacity, and the focus servo is adjusted based on the adjustment result. The means performs focus servo, and at the other time, the servo adjustment means performs at least one type of servo adjustment related to tracking servo, and the tracking servo means performs tracking servo based on the adjustment result. 2. The optical disc device according to 2. A learning storage unit that stores the adjustment result for each region;
When a predetermined operation is performed in the operation means and the objective lens of the optical pickup moves to a position corresponding to the area where servo adjustment has already been performed, which is different from the current area, the storage means stores the optical pickup in the optical pickup. The reproduction data based on the signal read from the disc is sequentially stored in the track buffer, and the sending means sequentially sends the reproduction data stored in the track buffer to the back end, and the capacity is first stored in the track buffer after the movement. When the reproduction data is fully stored, the focus servo means performs focus servo based on the adjustment result stored in the learning storage unit corresponding to the current area, and / or the current corresponding to the current area. The tracking servo means is based on the adjustment result stored in the learning storage unit. The optical disk apparatus according to claim 2, characterized in that the Tsu King servo.

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