JP2006216120A - Optical disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk device which reduces, in pausing, the destruction of a recording layer of a rewritable optical disk due to a superposed pulse of laser light from an optical pickup. <P>SOLUTION: In the case that a pausing state is made after an optical disk is inserted and it is determined that the pausing state continues for a prescribed period of time, a tracking servo is turned off. In the case that a pausing state is made by a pausing operation after reproduction is started and it is determined that the pausing state continues for a prescribed period of time, the tracking servo is turned off. By the turning-off of the tracking servo, a following operation of an optical pickup to a target track is stopped, the optical disk is randomly irradiated with laser light, and an irradiation frequency of the laser light to an address of a certain track on the optical disk is reduced. Therefore, the destruction of a recording layer of a rewritable optical disk due to a superposed pulse of laser light is reduced. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to an optical disc apparatus that performs information reproduction or recording / reproduction with respect to an optical disc, and more particularly to an optical disc apparatus having a function of controlling tracking servo for an optical pickup in a pause state.

Playback of information on optical discs such as DVD (Digital Versatile Disc)
Alternatively, in an optical disc apparatus that performs recording / reproduction, at the time of reproduction, information is reproduced by irradiating a track on the optical disc with laser light emitted from an optical pickup and receiving reflected light from the optical disc. In these optical discs, pit rows are continuously formed in a spiral shape from the inside to the outside of the disc. The pit row is divided into blocks by being separated by a synchronization signal at certain intervals, and each block is called a frame. A pit row for one round is called a track. The optical disk device is provided with a tracking servo mechanism,
When reading data from the optical disk, the position of the optical pickup is controlled so that the optical pickup traces the pit row (track).

By the way, the optical disc apparatus has a pause function for setting a pause state when the user presses a pause key such as a remote controller after inserting an optical disc or after starting reproduction. In such a paused state, the optical pickup reads the information by reading the information by repeatedly irradiating the laser beam to the same address at one track to two tracks on the optical disc. The irradiation position returns to the previous designated address. That is, in the conventional optical disk apparatus, at the time of a pause, a read (read), a track jump, a read (read), a track jump, a read (read), a track jump, and a read (read) are performed in the vicinity of a specified address by a jump of 1 to 2 tracks. Read), ... are repeated.
JP-A-10-334478 JP 2003-196852 A JP-A-62-138316

As described above, in the conventional optical disk apparatus, at the time of a pause, a jump of 1 to 2 tracks is performed in the vicinity of a specified address, and a read (read), track jump, read (read), track jump, read (read), track jump, read (reading),···
3 is repeated, for example, as shown in FIG. 3, from the optical pickup, a superimposed pulse b superimposed on the laser beam a of the read power (laser power at the time of reading) (a laser beam so that a good reflected light can be obtained). Laser light emitted from the laser diode in accordance with the characteristics of the diode, and pulse light for correcting the deviation of the emission point of the laser diode is emitted. When the same track of a rewritable optical disc (DVD-RW etc.) is repeatedly applied for a long time many times,
There is a problem that the possibility that the disk recording layer is broken increases.

In a conventional optical disc apparatus, it is conceivable to perform, for example, 100 track jumps instead of the above-mentioned one or two track jumps at the time of pause, but laser light is superimposed on the same 100 tracks at the time of pause. Since the pulse is irradiated, there is a problem that the possibility that the disk recording layer is destroyed also increases in this case.

In the prior art of Patent Document 1, the back jump period is made constant and the vibration resistance is improved. However, the laser beam superposition pulse from the optical pickup can be rewritten many times on the same track of the optical disc. No measures are taken to reduce the destruction of the disk recording layer by repeated irradiation for a long time.

In the prior art of Patent Document 2, in an optical disc apparatus capable of reproducing an optical disc having a plurality of information recording surfaces on one side of the disc, the optical pickup is moved from the inner periphery to the outer periphery of the disc at a position where pause is instructed. In this prior art, the superimposed pulse of the laser beam from the optical pickup is repeatedly irradiated over the same track of the rewritable optical disc many times for a long time. No measures are taken to mitigate the destruction of the disk recording layer.

In the prior art of Patent Document 3, the disk rotation is configured to return one track in one lap or to return 10 tracks in one lap when in a pause state.
This prior art also takes measures to reduce the destruction of the disk recording layer by repeatedly irradiating the same rewritable optical disk with a laser beam superposition pulse from an optical pickup many times over a long period of time. Not.

The present invention has been made to solve the above-described problems, and can reduce the destruction of the recording layer of the rewritable optical disk by the superimposed pulse of the laser beam from the optical pickup during the pause. An object is to provide an optical disk device.

In order to achieve the above object, the invention of claim 1 is in a paused state after inserting an optical disc, or in a paused state after receiving a pause operation after starting playback. Pause state determination means for determining whether or not, and when the pause state is caused by the pause operation, the address information of the address on the optical disc irradiated with the laser beam from the optical pickup in this pause state is stored in the memory Address storage means to
Tracking servo-off means for turning off the tracking servo for the optical pickup when the pause state is determined by the pause state judging means, and reproduction by a reproduction operation when the tracking servo is off A tracking servo-on means for turning on the tracking servo when receiving an instruction and a pause state after inserting an optical disk, and after the tracking servo is turned on by the tracking servo-on means, are designated by a reproduction operation. The address stored in the memory after the tracking servo is turned on by the tracking servo-on means when the optical pickup seeks based on the address information and is in a pause state after the reproduction is started. Providing a seek means for seeking operation of the optical pickup on the basis of the distribution, the optical disk apparatus characterized by comprising a system controller and a reproduction start means for starting the reproduction from the seek address by said seek operation.

In this configuration, when the optical disk is inserted, the pause state is set, and when the pause state determination means determines that the predetermined time has elapsed, the tracking servo for the optical pickup is turned off by the tracking servo off means. When the tracking servo is off, the tracking servo is turned on by the tracking servo-on means when a reproduction command is received by a reproduction operation. After the tracking servo is turned on, the optical pickup performs a seek operation by the seek unit based on the address information designated by the reproduction operation, and the reproduction is started by the reproduction start unit from the seek address.

In addition, after the reproduction is started, a pause operation is received to enter a pause state. When the pause state determination unit determines that the pause state has elapsed for a predetermined time, the tracking servo for the optical pickup is turned off by the tracking servo off unit. When the tracking servo is off, the tracking servo is turned on by the tracking servo-on means when a reproduction command is received by a reproduction operation. After the tracking servo is turned on, the optical pickup performs a seek operation by the seek unit based on the address information stored in the memory at the time of pause, and reproduction is started by the reproduction start unit from the seek address.

According to this configuration, since the tracking servo for the optical pickup is turned off when the pause state has elapsed for a predetermined time, the laser beam from the optical pickup irradiates the track on the optical disk at random, thereby the optical pickup at the time of the pause. It is possible to reduce the destruction of the rewritable recording layer of the optical disc by the superimposed laser beam from the laser beam.

The invention of claim 2 is in a pause state after inserting an optical disc, or in a pause state after receiving a pause operation after starting playback, and when this pause state has elapsed for a predetermined time,
Provided is an optical disc device comprising a system controller for turning off tracking servo for an optical pickup.

In this configuration, when the optical disc is inserted, it is in a pause state, or after playback is started, a pause operation is performed, and when this pause state has elapsed for a predetermined time,
The tracking servo for the optical pickup is turned off.

According to this configuration, since the tracking servo for the optical pickup is turned off when the pause state has elapsed for a predetermined time, the laser beam from the optical pickup irradiates the track on the optical disk at random, thereby the optical pickup at the time of the pause. It is possible to reduce the destruction of the rewritable recording layer of the optical disc by the superimposed laser beam from the laser beam.

According to a third aspect of the present invention, in the second aspect of the present invention, the system controller is in a pause state after inserting an optical disk, or in a pause state after receiving a pause operation after starting reproduction, and the pause state is predetermined. Pause state determination means for determining whether or not time has elapsed, and tracking servo off means for turning off the tracking servo for the optical pickup when it is determined by the pause state determination means that the pause state has elapsed for a predetermined time. Therefore, when the pause state has elapsed for a predetermined time, the tracking servo for the optical pickup can be turned off.

According to a fourth aspect of the present invention, the system controller enters a pause state after inserting an optical disc, or enters a pause state after receiving a pause operation after starting playback, and determines whether or not this pause state has elapsed for a predetermined time. A pause state determination means for determining, and an address storage for storing, in a memory, address information of an address on the optical disc irradiated with the laser light from the optical pickup in the pause state when the pause state is caused by the pause operation A tracking servo-off means for turning off the tracking servo for the optical pickup when it is determined by the pause state determination means that the pause state has elapsed for a predetermined time; and a reproduction when the tracking servo is off. The trackin when receiving a reproduction command by operation In the case of a tracking servo-on means for turning on the servo and a pause state after inserting the optical disk, after the tracking servo is turned on by the tracking servo-on means, the optical pickup is based on the address information specified by the reproducing operation. In the pause state after starting playback, and after the tracking servo is turned on by the tracking servo-on means,
Seek means for seeking the optical pickup based on address information stored in the memory; and reproduction start means for starting reproduction from an address sought by the seek operation.

Therefore, the tracking servo for the optical pickup can be turned off when the pause state elapses for a predetermined time. Further, in the pause state after the optical disk is inserted, after the tracking servo is turned on, the optical pickup can perform a seek operation based on the address information designated by the reproduction operation. Further, in the pause state after the start of reproduction, after the tracking servo is turned on, the optical pickup can perform a seek operation based on the address information stored in the memory. Then, reproduction can be started from the seek address.

As described above, according to the present invention, a pause state is entered after an optical disc is inserted, or a pause operation is performed after playback is started, and a pause state is entered, and it is determined whether or not a predetermined time has elapsed. A pause state determination means; and an address storage means for storing, in a memory, address information of an address on the optical disc irradiated with a laser beam from the optical pickup in the pause state when the pause state is caused by the pause operation. Tracking servo-off means for turning off the tracking servo for the optical pickup when the pause state is determined by the pause state determining means; and when the tracking servo is off, Turn on the tracking servo when receiving a playback command When the tracking servo is turned on by the tracking servo-on means in the pause state after the racking servo-on means and the optical disk are inserted, the optical pickup is caused to seek based on the address information specified by the reproduction operation. Further, in the pause state after the reproduction is started, after the tracking servo is turned on by the tracking servo-on means, the seek means for seeking the optical pickup based on the address information stored in the memory And a playback controller that starts playback from the address sought by the seek operation, the tracking servo for the optical pickup is turned off when the pause state has elapsed for a predetermined time. Beep The laser beam from the upper side randomly irradiates the track on the optical disk, and the frequency of the laser beam being irradiated to the address of a certain track on the optical disk decreases. It is possible to reduce the destruction of the recording layer of the optical disk that can be rewritten by the superimposed pulse.

Further, according to the present invention, the optical disk is placed in a pause state after the optical disk is inserted, or after a playback operation is started, a pause operation is performed, and when the pause state has elapsed for a predetermined time, tracking servo for the optical pickup is performed. Since the system controller is turned off, the tracking servo for the optical pickup is turned off when the paused state has passed for a predetermined time, so that the laser beam from the optical pickup randomly irradiates the track on the optical disc, The frequency of laser beam irradiation to a certain track address is reduced, and therefore the rewritable optical disc recording layer is prevented from being destroyed by the superimposed pulse of the laser beam from the optical pickup during the pause. Can do.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a block diagram showing a configuration of an optical disc apparatus according to an embodiment of the present invention. Here, an optical disc apparatus such as a DVD recorder that performs recording / reproduction will be described.
It goes without saying that the processing in the pause state, which is a feature of this embodiment, can also be applied to an optical disc apparatus such as a player.

The optical disk apparatus includes a spindle motor 5 that rotates the optical disk 1, an optical pickup 2 that optically writes / reads information to / from the optical disk 1, and an optical pickup 2 that moves the optical pickup 2 in the radial direction of the optical disk 1. The spindle motor 5 and the sled 3 are driven according to the instructions of the sled 3 and the system controller 22 and the objective lens (not shown) built in the optical pickup 2 is moved to record the focal position of the laser light on the optical disc 1. And a servo control unit 4 that performs control to move the surface in a vertical direction and a horizontal direction.

The optical disc apparatus also includes an RF amplifier 6 that amplifies an RF signal that is a read signal from the optical pickup 2 during reproduction of the optical disc 1, and an optical disc 1 that converts the RF signal output from the RF amplifier 6 into digital data. A digital signal processing unit 8 that stores data generated by performing signal demodulation processing and error correction processing according to the data format of the RAM 7 in the RAM 7, and a data stream output from the digital signal processing unit 8 in response to an instruction from the system controller 22 Is provided with a stream separator 9 for separating audio data, sub-picture data, and video data.

The optical disc apparatus also stores an audio decoder 11 that receives the audio data output from the stream separator 9 and performs a predetermined decoding process, and temporarily stores the data to perform the decoding process in the audio decoder 11. The RAM 10, the sub-picture decoder 13 that inputs the sub-picture data output from the stream separation unit 9 and performs a predetermined decoding process, and temporarily stores the data to perform the decoding process by the sub-picture decoder 13 A RAM 12, a video decoder 15 that receives the video data output from the stream separation unit 9 and performs a predetermined decoding process, and a RAM 14 that temporarily stores data to perform the decoding process in the video decoder 15. It has.

The optical disk apparatus also combines a video processor 17 that synthesizes data output from the video decoder 15 and data output from the sub-picture decoder 13 in accordance with an instruction from the system controller 22, and output from the video processor 17. A video encoder 18 that converts the synthesized data into a video signal for display and displays an image on the display device 20, and a D / D converter that converts the data output from the audio decoder 11 into an analog audio signal and supplies the analog audio signal to the speaker 19, for example. A converter 16 is provided.

The optical disc apparatus also has various operation keys such as a recording key for giving a recording instruction to the system controller 22, a reproducing key for giving a reproducing instruction, and a stop key for giving a recording / reproducing stop instruction. And a system controller 22 for controlling the entire apparatus. In addition, this optical disk apparatus has a flash ROM 23 in which programs and data for controlling each component of the apparatus and for controlling the entire apparatus are stored, and a system that performs arithmetic processing according to the programs and data in the flash ROM 23 A CPU 24 that controls the controller 22 and a RAM 27 that temporarily stores data necessary for arithmetic processing of the CPU 24 are provided.

The optical disk apparatus also includes a recording data modulation circuit 25 that modulates video / audio data sent from a television receiver (not shown), a personal computer, or the like to record on the optical disk 1, and the recording data modulation circuit 25. And a laser modulation circuit 26 for outputting a laser modulation signal for modulating the laser beam emitted from the optical pickup 2 to the optical pickup 2 based on the modulated data.

The system controller 22 is put into a pause state after inserting the optical disk 1 as a characteristic element of the present embodiment, or in a pause state after receiving a pause operation after starting reproduction. Pause state determination means 221 for determining whether or not the time has elapsed, and when the pause operation is performed, the address of the address on the optical disk 1 to which the laser beam from the optical pickup 2 is irradiated in the pause state Address storage means 222 for storing information in the flash ROM 23, and tracking servo off means 223 for turning off the tracking servo for the optical pickup 2 when the pause state determination means 221 determines that the pause state has passed for a predetermined time. Have.

Further, the system controller 22 is configured such that when the tracking servo is off,
When the tracking servo is turned on when the tracking servo is turned on by the tracking servo-on means 223 when the tracking servo-on means 224 turns on the tracking servo when receiving a reproduction command by the reproduction operation and the optical disk 1 is inserted. The optical pickup 2 is sought based on the address information specified by the reproduction operation,
In the pause state after the start of reproduction, after the tracking servo is turned on by the tracking servo-on means 223, the seek means 225 for causing the optical pickup 2 to perform a seek operation based on the address information stored in the flash ROM 23; And reproduction start means 226 for starting reproduction from the address sought by the seek operation.

FIG. 2 is a flowchart for explaining processing when the optical disk apparatus according to this embodiment is in a paused state. With reference to this flowchart, processing when the optical disk apparatus according to the present embodiment is in a pause state will be described.

After the optical disk 1 is inserted into the optical disk apparatus (step S1), the optical disk apparatus is in a pause state (step S2), and whether or not the pause state has passed for a predetermined time is determined by the pause state determination means 221 of the system controller 22. Determined (step S3)
. When the pause state determination means 221 determines that the pause state has elapsed for a predetermined time,
The tracking servo off means 223 of the system controller 22 controls the servo control unit 4 to turn off the tracking servo for the optical pickup 2 (step S4).

When the tracking servo is turned off in this manner, when the optical disk 1 is a rewritable optical disk, the laser beam from the optical pickup 2 adds the disk eccentricity component and irradiates the track of the optical disk 1 at random. Thus, it is possible to reduce the destruction of the rewritable recording layer of the optical disc 1 due to the superimposed pulse of the laser beam from the optical pickup 2 during the pause.

When the tracking servo is off, or when the pause state has not elapsed for a predetermined time, when a playback command is received by pressing the playback key of the remote controller 21 or the playback key of the operation unit (not shown) (step S5). ) The tracking servo on means 224 of the system controller 22 controls the servo control unit 4 to turn on the tracking servo for the optical pickup 2 (step S6). After the tracking servo is turned on, the seek unit 225 of the system controller 22 controls the servo control unit 4 to cause the optical pickup 2 to perform a seek operation based on the address information designated by the reproduction operation (step S7).
Then, the reproduction start means 226 starts reproduction from the address on the optical disc 1 where the optical pickup 2 has been sought (step S8).

After the reproduction is started, if a pause operation is performed by pressing a pause key such as the remote controller 21 (step S9), the process returns to step S3. When a pause key such as the remote controller 21 is pressed, the address storage means 222 of the system controller 22 displays address information of the address on the optical disc 1 to which the laser beam from the optical pickup 2 is irradiated when the pause state is set. Store in the flash ROM 23.

Similarly, in step S3, it is determined by the pause state determination means 221 of the system controller 22 whether or not the pause state has elapsed for a predetermined time (step S3). When the pause state determination unit 221 determines that the pause state has elapsed for a predetermined time, the tracking servo off unit 223 of the system controller 22 controls the servo control unit 4 to turn off the tracking servo for the optical pickup 2 (step S4). ).

Then, when the tracking servo is turned off, or when the pause state has not elapsed for a predetermined time, when a reproduction command is received by pressing a reproduction key such as the remote controller 21 (
In step S5), the tracking servo-on means 224 of the system controller 22 controls the servo control unit 4 to turn on the tracking servo for the optical pickup 2 (step S6). After the tracking servo is turned on, the seek unit 225 of the system controller 22 reads the address information stored in the flash ROM 23, controls the servo control unit 4, and performs a seek operation on the optical pickup 2 based on the address information. (Step S7), the reproduction start means 226 starts reproduction from the address on the optical disc 1 where the optical pickup 2 has been sought (Step S8). There is no pause operation (step S9),
When the reproduction is finished (step S10), this process is finished.

As described above, according to the present embodiment, when the pause state has elapsed for a predetermined time, the tracking servo for the optical pickup is turned off. Therefore, the laser beam from the optical pickup randomly irradiates the track on the optical disc, and the optical disc The frequency with which the laser beam is irradiated to the address of a certain upper track is reduced, thereby reducing the destruction of the rewritable optical disc recording layer due to the superimposed pulse of the laser beam from the optical pickup during the pause. can do.

1 is a block diagram showing a configuration of an optical disc device according to an embodiment of the present invention. 4 is a flowchart for explaining processing when the optical disc apparatus of the embodiment is in a pause state. It is a signal waveform diagram for demonstrating the superimposition pulse radiate | emitted from an optical pick-up.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical disk 2 Optical pick-up 22 System controller 221 Pause state determination means 222 Address storage means 223 Tracking servo off means 224 Tracking servo on means 225 Seek means 226 Playback start means

Claims (4)

In an optical disk apparatus having an optical pickup that optically reads / writes information to / from an optical disk and performs information reproduction / recording / reproduction with respect to the optical disk, the optical disk apparatus enters a pause state after the optical disk is inserted. Or a pause state after receiving a pause operation after starting playback, and a pause state determination means for determining whether or not this pause state has passed for a predetermined time; and when the pause state is caused by the pause operation, The address storage means for storing the address information of the address on the optical disk irradiated with the laser beam from the optical pickup in the pause state in the memory, and the pause state determination means that the pause state has passed for a predetermined time If the tracking servo for the optical pickup is turned off When the tracking servo is turned off, the tracking servo is turned off when the tracking servo is turned off, and the tracking servo is turned on when receiving a reproduction command by a reproduction operation. After the tracking servo is turned on by the tracking servo on means,
When the optical pickup seeks based on the address information specified by the reproduction operation and is in a pause state after the reproduction is started, after the tracking servo is turned on by the tracking servo-on means, the memory An optical disk comprising: a system controller having seek means for seeking the optical pickup based on address information stored in the memory; and reproduction start means for starting reproduction from an address sought by the seek operation. apparatus. In an optical disk apparatus having an optical pickup that optically reads / writes information to / from an optical disk and performs information reproduction / recording / reproduction with respect to the optical disk, the optical disk apparatus enters a pause state after the optical disk is inserted. An optical disc apparatus comprising: a system controller that turns on a tracking servo with respect to the optical pickup when a pause operation is received after starting reproduction and the pause state is entered and a predetermined time elapses. The system controller is in a pause state after inserting an optical disc, or in a pause state after receiving a pause operation after starting playback, and a pause state determination means for determining whether or not the pause state has elapsed for a predetermined time. 3. A tracking servo off means for turning off the tracking servo for the optical pickup when the pause state judging means judges that the pause state has passed for a predetermined time.
An optical disk device according to the above. The system controller is in a pause state after inserting an optical disc, or in a pause state after receiving a pause operation after starting playback, and a pause state determination means for determining whether or not the pause state has elapsed for a predetermined time. When the pause operation results in a pause state, the address storage means for storing address information of an address on the optical disc irradiated with the laser beam from the optical pickup in the pause state, and the pause state A tracking servo-off means for turning off the tracking servo for the optical pickup when it is determined by the pause state determination means that a predetermined time has elapsed, and a reproduction command by a reproduction operation is received when the tracking servo is off Sometimes turn on the tracking servo When the tracking servo is turned on by the tracking servo-on means and the tracking servo is turned on in the paused state after the racking servo-on means and the optical disk are inserted, the optical pickup is caused to perform a seek operation based on the address information designated by the reproduction operation. Further, in the pause state after the reproduction is started, after the tracking servo is turned on by the tracking servo-on means, the seek means for seeking the optical pickup based on the address information stored in the memory 3. The optical disc apparatus according to claim 2, further comprising reproduction start means for starting reproduction from an address sought by the seek operation.

Images