JP4999544B2 - Optical disc playback apparatus and optical disc playback control method - Google Patents

Description

  The present invention relates to a reproduction control technique when a signal error occurs in an optical disk reproducing apparatus that reproduces an optical disk having a plurality of recording layers.

The playback control technology when an error occurs in an optical disk playback device that plays back an optical disk is as follows: When a signal error occurs due to a scratch on the disk, playback is performed by jumping the playback position for a predetermined number of tracks. There is known a technique for escaping a position from a storage area where a signal error occurs on an optical disk ( for example , Patent Document 1).

In addition, as a technique for reproducing control of an optical disc having a plurality of recording layers, when seeking a target address on a recording layer different from the recording layer currently being reproduced, first, after jumping to the different recording layer, A technique for performing a track / sector jump to a track / sector of a target address of the different recording layer is known (for example, Patent Document 2).
JP 06-036302 JP 2002-056547 A

  According to the technology that jumps the playback position for a predetermined number of tracks when a signal error occurs due to a scratch on the disc, the target jump destination is normal due to a scratch present in the jump path. As a result, the playback position may not be able to escape from the storage area on the optical disc where a signal error occurs.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an optical disc reproducing apparatus for reproducing an optical disc having a plurality of recording layers, and to reliably escape the reproduction position from a storage area on the optical disc where a signal error occurs when a signal error occurs. And

In order to achieve the above object, the present invention provides an optical disc reproducing apparatus for reproducing an optical disc having a plurality of recording layers, a pickup that selectively reproduces a signal from the plurality of recording layers of the optical disc, and a signal error detecting means for the pickup detects an error that occurred in the signal reproduced when said signal error detecting means has detected an error, a signal reproduction position is a position where the pickup to reproduce a signal radial direction of the optical disc Signal error recovery means moving to Here, the signal error recovery means is a first recording layer which is a recording layer including the signal reproduction position when the signal error detection means detects an error, and the signal reproduction position when the error is detected. from after performing a layer jump to move in the layer direction in the second recording layer wherein a first recording layer is not a recording layer of the plurality of recording layers, said signal reproducing position, the second recording layer After performing a track jump that moves in the radial direction of the optical disk by a predetermined number of tracks above, a layer jump that moves the signal reproduction position from the second recording layer to the first recording layer in the layer direction is performed.

In this optical disk reproducing apparatus, the signal error recovery means further performs the layer jump to move the signal reproduction position to the first recording layer in the layer direction, and then sets the signal reproduction position to the signal reproduction position. A search may be made to move to a position moved in the radial direction of the optical disk by the predetermined number of tracks from the signal reproduction position when the signal error detecting means detects an error.

  According to these optical disk reproducing apparatuses, when a signal error occurs, the movement of the track by the predetermined number of tracks at the signal reproduction position is performed on the recording layer different from the recording layer where the signal error has occurred. Can be used as a route between. Here, if the signal error is caused by a flaw, track jumps and other seek / search operations in the recording layer where the signal error has occurred may not be performed normally due to the flaw. The layer is not affected by this scratch, and the recording layer can normally perform track jump and other seek / search operations normally.

  Therefore, according to the present invention, when a signal error occurs, the playback position can be more reliably escaped from the storage area on the optical disc where the signal error occurs.

  As described above, according to the present invention, in an optical disc playback apparatus that plays back an optical disc having a plurality of recording layers, when a signal error occurs, the playback position is reliably set from the storage area where the signal error occurs on the optical disc. You can escape.

Hereinafter, embodiments of the present invention will be described.
FIG. 1 shows a configuration of an optical disc drive according to the present embodiment.
As shown in the figure, the optical disk drive 1 includes a clamper 101, a turntable 102, a spindle motor 103, a feed motor 104, a pickup 105, an RF amplifier 106, a signal processing unit 107, a servo control unit 108, a system controller 109, and a host device 2. A host interface 110 to be connected and a signal error detection unit 111 are provided.

  In such a configuration, the clamper 101 and the turntable 102 clamp the optical disc 3 such as a DVD having two recording layers mounted on the optical disc drive 1, and the spindle motor 103 is interposed between the turntable 102 and the clamper 101. The clamped optical disk 3 is rotated. Further, the feed motor 104 performs a seek operation and tracking adjustment for moving the pickup 105 in the radial direction of the optical disc 3.

  Next, the pickup 105 includes a laser light source, a photoelectric element, and an objective lens that condenses the irradiation light from the laser light source on the recording layer of the optical disc 3 and guides the reflected light from the recording layer of the optical disc 3 to the photoelectric element. A focus actuator that adjusts the focal position by moving the objective lens in a direction perpendicular to the signal recording surface of the optical disc 3, and a tracking actuator that performs tracking adjustment by moving the objective lens in the radial direction of the optical disc 3. It is out. The pickup 105 outputs a readout signal obtained by photoelectrically converting the reflected light from the signal recording surface of the optical disc 3 detected by the photoelectric element.

  Next, the RF amplifier 106 amplifies the read signal output from the pickup 105 and outputs the amplified signal to the signal processing unit 107 as an RF signal. The RF amplifier 106 generates a focus error signal (FE) necessary for the focus servo, a tracking error signal (TE) necessary for the tracking servo, and the like from the read signal output from the pickup 105.

Next, the signal processing unit 107 demodulates data from the RF signal output from the RF amplifier 106, detects and corrects an error that has occurred in the demodulated data, and reproduces the data recorded on the optical disc 3. The reproduced data is sent to the host interface 110.
In addition, the signal error detection unit 111 monitors the RF signal output from the RF amplifier 106, detects the occurrence of a signal error such as a dropout that is a missing recording signal component in the RF signal, and performs servo control with the system controller 109. Notify the control unit 108.
On the other hand, the servo control unit 108 performs control of the seek operation of the feed motor 104 according to the control of the system controller 109 and various servo controls according to the focus error signal (FE) and the tracking error signal (TE). For example, the servo control unit 108 performs control of the laser light source, focus servo control, and tracking servo control by sending instructions to the pickup 105 and the feed motor 104, and sends instructions to the spindle motor 103 to send the spindle motor 103. Servo control of the number of rotations. The servo control unit 108 also performs an operation of maintaining the servo control characteristics at the characteristics before the signal error occurrence notification during the period when the detection of the occurrence of the signal error is notified.

  Then, the system controller 109 controls the above-described units, reproduces the data requested by the host command from the optical disc 3 according to the host command received from the host apparatus 2 via the host interface 110, and performs the host interface 110. A read process for transferring to the host device 2 via the host is performed.

In such a configuration, when a signal error occurs during reproduction of the optical disc 3, the system controller 109 causes the reproduction position to escape from the storage area on the optical disc 3 where the signal error occurs. The signal error recovery process shown in FIG.
That is, if the system controller 109 is notified of the occurrence of a signal error from the signal error detection unit 111 during reproduction of the optical disc 3 in the above-described read processing or other processing (search processing or the like) ( Step 202), the playback is stopped once (Step 204).

  Then, the address that was being played when the signal error occurred was the error occurrence address, the recording layer that was being played when the signal error occurred was the error occurrence recording layer, and the number of jump tracks that were determined in advance from the error occurrence address The address advanced on the error occurrence recording layer is set as the jump target address (step 206).

  Then, the servo control unit 108 is caused to perform a layer jump for switching the recording layer of the optical disc 3 to be reproduced (step 208). In this layer jump, the servo control unit 108 controls the focus actuator of the pickup 105 to set the focal length of the objective lens to the focus corresponding to the bypass recording layer. After switching to the distance, by starting the focus servo control and tracking servo control, the reproduction position is jumped to an address around the position overlapping the error occurrence address on the bypass recording layer.

  Next, the system controller 109 causes the servo control unit 108 to perform a track jump that advances the reproduction position on the bypass recording layer by the number of jump tracks described above (step 210). A layer jump for switching the recording layer of the optical disc 3 to be reproduced from the bypass recording layer to the error occurrence recording layer is performed (step 212). Here, in this layer jump, the playback position overlaps with the address jumped in step 212 on the bypass recording layer on the error recording layer by the same operation as the layer jump operation of the servo control unit 108 described above. This is an address around the location.

  When the layer jump to the error occurrence recording layer is completed, the jump target address is searched on the error occurrence recording layer (step 214), and the reproduction is resumed from the jump target address (step 216). However, when the layer jump to the error occurrence recording layer is completed, the reproduction may be resumed from the address that is the reproduction position at that time.

Then, returning to step 202, the occurrence of the next signal error is monitored.
The signal error recovery process performed by the system controller 109 has been described above.
Here, FIG. 3 shows a processing example of the signal error recovery processing as described above.
Now, as shown in the figure, an optical disk 3 having two recording layers, an A layer and a B layer, in which addresses are given from the inner circumference side to the outer circumference side in each recording layer is taken as an example. Further, the area between the track number (TRn) of the A layer of the optical disc 3 and the track number j (j> i) from the track of i is a signal error occurrence area 301 in which a signal error occurs due to scratches. Shall.

In this case, if the playback position is advanced in the order of addresses on the A layer, a signal error occurs when the playback position advances to the address XS on the track of track number i.
Then, XT on the track of track number i + n on the A layer, which is a predetermined number of jump tracks n on the A layer from the address XS, is set as the jump target address. However, n shall satisfy n> j-i .
Then, a layer jump to the B layer is performed, and the reproduction position becomes an address around the position on the B layer that overlaps the address XS of the A layer. Here, it is assumed that the address YS on the track of track number i on the B layer becomes the reproduction position by the layer jump.
When the layer jump to the B layer is completed, the track jump of the number of jump tracks n is performed from the address YS on the B layer, and the address YT on the track of the track number i + n on the B layer is It becomes the playback position.
Next, when the track jump on the B layer is completed, the layer jump to the A layer is performed again, and the reproduction position is an address around the position on the A layer that overlaps the address YT on the B layer. . Here, it is assumed that the address XM on the track of track number i + n on the A layer becomes the reproduction position by the layer jump.

  When the layer jump to the A layer is completed in this way, the search for XT on the track of the track number i + n on the A layer, which is the jump target address, is performed from the address XM on the A layer. Playback is resumed from this jump target address XT.

  As described above, according to the signal error recovery process, when the reproduction position advances to the signal error occurrence area 301 where the signal error occurs, the movement of the reproduction position to the track outside the signal error occurrence area 301 is changed to the signal error. This can be performed by a path that bypasses the signal error occurrence area 301 using a recording layer different from the recording layer in which the occurrence area 301 exists. If the signal error occurrence area 301 is caused by a flaw, track jump jumps and other seek / search operations in the recording layer in which the signal error occurrence area 301 exists may not be performed normally due to the flaw. . On the other hand, the recording layer different from the recording layer in which the signal error occurrence area 301 exists is not affected by this flaw, and the track jump and other seek / search operations can be normally performed in many cases.

  Therefore, according to the present embodiment, when a signal error occurs, the playback position can be more reliably escaped from the storage area on the optical disc 3 where the signal error occurs.

1 is a block diagram showing a configuration of an optical disc drive according to an embodiment of the present invention. It is a flowchart which shows the signal error recovery process which concerns on embodiment of this invention. It is a figure which shows the process example of the signal error recovery process which concerns on embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Optical disk drive, 2 ... Host apparatus, 3 ... Optical disk, 101 ... Clamper, 102 ... Turntable, 103 ... Spindle motor, 104 ... Feed motor, 105 ... Pickup, 106 ... RF amplifier, 107 ... Signal processing part, 108 ... Servo controller, 109... System controller, 110... Host interface, 111.

Claims (4)

An optical disc reproducing apparatus for reproducing an optical disc having a plurality of recording layers,
A pickup that selectively reproduces signals from a plurality of recording layers of the optical disc;
Signal error detection means for detecting an error occurring in the signal reproduced by the pickup from the recording layer;
A signal error recovery means for moving the signal reproduction position, which is a position where the pickup reproduces a signal, in the radial direction of the optical disc when the signal error detection means detects an error;
The signal error recovery means, when the signal error detection means detects an error, the signal reproduction position from the first recording layer which is a recording layer including the signal reproduction position when the error is detected, predetermined track on the performed layer jump to move in the layer direction in the second recording layer is the recording layer is not a first recording layer, the signal reproducing position by said second recording layer of the plurality of recording layers After performing a track jump that moves in the radial direction of the optical disk for several minutes, the optical disk is subjected to a layer jump that moves the signal reproduction position from the second recording layer to the first recording layer in the layer direction. Playback device. An optical disk reproducing apparatus according to claim 1, wherein
The signal error recovery means is a signal when the signal error detection means detects an error after performing a layer jump to move the signal reproduction position to the first recording layer in the layer direction. An optical disk reproducing apparatus for performing a search for moving from a reproduction position to a position moved in the radial direction of the optical disk by the predetermined number of tracks. In an optical disk reproducing apparatus for reproducing an optical disk having a plurality of recording layers, an optical disk reproduction control method for controlling reproduction of the optical disk,
A first step of detecting an error occurring in a signal reproduced from the recording layer of the optical disc;
A second step of moving a signal reproduction position, which is a position for reproducing the signal, in the radial direction of the optical disc when the error is detected;
The second step includes
The signal reproduction position is a second recording layer that is not the first recording layer among the plurality of recording layers from a first recording layer that is a recording layer including the signal reproduction position when the error is detected. Performing a layer jump moving in the layer direction to the recording layer;
Performing a track jump for moving the signal reproduction position in the radial direction of the second predetermined number of tracks on the recording layer minutes the optical disc,
And performing a layer jump for moving the signal reproduction position from the second recording layer to the first recording layer in a layer direction. An optical disk playback control method according to claim 3,
The second step further includes:
After performing a layer jump to move the signal reproduction position to the first recording layer in the layer direction, the signal reproduction position is changed from the signal reproduction position when the error is detected to the diameter of the optical disc by the predetermined number of tracks. An optical disc reproduction control method comprising a step of performing a search for moving to a position moved in a direction .