KR20050117318A - Write and read control method of multi-layer disc - Google Patents

Abstract

According to the present invention, in the multilayer optical disc, in particular, the recording of the multilayer optical disc can be recorded along a sequential path, and the recording and recording of the multilayer disc such that reproduction can be performed in the same path with respect to the information thus recorded and A reproduction control method.

In the recording control method of a multilayer disk according to the present invention, after performing an optimal power control (OPC) process for each recording layer of a high density multilayer optical disk, reading and storing the recording power information for each recording layer in a memory ; And a recording step of recording from the Nth recording layer based on the recording power information of each recording layer, and then repeating the steps of moving to another recording layer and recording another recording layer.

Description

Write and read control method of multi-layer disc}

According to the present invention, in the multilayer optical disc, in particular, the recording of the multilayer optical disc can be recorded along a sequential path, and the recording and recording of the multilayer disc such that reproduction can be performed in the same path with respect to the information thus recorded and A reproduction control method.

Recently, a new high-density rewritable optical disc capable of recording and storing high-definition video data and high-quality audio data for a long time, for example, as shown in FIG. 1, is called a rewritable Blu-ray Rewritable Disc (hereinafter referred to as "Blu-ray Disc"). As the standardization work is rapidly progressing, related products are expected to be developed, released and commercialized.

Blue Laser-related products are introduced as the next generation recording and reproducing device. Blu-ray discs can store about 25GB of data on one side and record twice as much video and audio data for a long time when produced in dual layer. This becomes possible.

However, in the case of a conventional DVD can be achieved twice the capacity when producing in a dual layer, but there is a difficulty in producing a disc that can be recorded in a dual layer (Dual Layer).

Blu-ray discs can be created in one or more layers, all of which can be played and rewritten. In order to record data on such a disk, an initial Optimum Power Control (OPC) process is first performed. Through the OPC process, power levels suitable for various disks and various pickups are found and real data is recorded on the disk. .

As shown in FIG. 1, in the case of a CD / DVD, after performing the above OPC process in the PCA (Power Calibration Area) area of the innermost circumference, actual data is recorded in the data area. In the case of such a CD / DVD, since there is no dual layer recording, the problem of difference in recording power between layers does not need to be considered.

2 and 3 are side cross-sectional views showing a blue layer disk on which a dual layer is formed. As shown in FIGS. 2 and 3, the Blu-ray disc 30 has two recording layers (layer2, layer1), and the two recording layers (Layer 1, Layer2) are spaced at a predetermined interval d2. The first recording layer Layer1 is formed to face the position d1 spaced apart in the direction of the objective lens 11 of the optical pickup.

In the optical disk apparatus for reading, reproducing or recording data recorded in the recording layer of the Blu-ray disk 30, the optical power of the laser diode (LD) 13 included in the optical pickup is determined. Variable adjustment is made to suit the recording operation or the reproduction operation. In the above optical pickup, for example, the light source emitted from the laser diode 13 is converted into parallel light in the collimator lens CL, 12, and the parallel light is collected in the recording layer of the disk in the objective lens OL, 11 and again. As reflected, the recording or reproducing operation is performed.

Here, a clamping area and a lead-in zone are separately allocated to the innermost circumference of the Blu-ray disc, a user data area is assigned to the center, and an outer area to the outer circumference. zones are allocated.

The lead-in area may be divided into a pre-recorded area and a rewritable area, and the pre-recorded area includes a permanent information amp (PIC) data area. Disc information ID, disc structure information, OPC area, and the like are allocated to the PIC data area, and the reproduction optical power and the recording optical power control information are present in the OPC area.

Here, when the Blu-ray disc is a dual layer, since the recording power of each layer is different, the recording power measured in the first recording layer cannot be applied to the other layers, so that each recording layer is used for information about the recording power of each layer. OPC region exists.

4 is a diagram showing a recording method of a conventional Blu-ray disc.

Referring to FIG. 4, the write power information of the second recording layer (Layer 2) is read from the OPC area included in the lead-in area of the Blu-ray disc, and the read write power information is stored in the memory. Then, data recording is performed while moving from the inner circumference of the second recording layer to the outer circumference based on the recording power information of the second recording layer (W1).

When the recording of the second recording layer is completed, the apparatus moves to the OPC area of the lead-in area again in order to record the first recording layer, and reads the recording power information for the first recording layer (W2). After storing the recording power information of the first recording layer in the memory and moving to the outer periphery of the disc (W3), data recording is performed from the outer periphery of the first recording layer to the inner periphery based on the recording power information of the first recording layer ( W4).

In the case of the dual layer of the Blu-ray Disc, the recording power variation between the inner and outer circumferences and the power variation between the recording layers have to be compensated for during recording. In particular, when moving from the second recording layer to the first recording layer, the layer is changed at the outer periphery. In order to compensate for the power deviation, the information on the interlayer recording power must be known in advance so that the recording power can be effectively applied. do.

FIG. 5 is a flowchart showing the flow of the recording method of FIG. 4.

First, when the loading operation of the optical disc is performed (S11), and when a data recording request is received (S13), the OPC process is performed in the lead-in area of the second recording layer and then the recording power information for the second recording layer is read. (S15). After storing the recording power information of the second recording layer in the memory, data recording is performed in the disc circumferential direction from the disc inner circumference of the second recording layer using the same (S17).

When the recording of the second recording layer is completed, the apparatus moves back to the OPC area of the lead-in area, performs an OPC process on the first recording layer, and reads and stores the recording power information (S19). After moving from the inner circumference to the outer circumference of the disc again (S21), the recording power information of the first recording layer is recorded from the outer circumference of the first recording layer to the inner circumference using the read first recording layer (S23).

However, in the blue layer disc formed of the multi-layer as described above, since the process of reading the optimum power level is read again before the recording of each recording layer, there is a problem that the recording is not continuously performed. For example, when recording from the second recording layer to the first recording layer, an OPC operation of the second recording layer is performed and recorded, and again after the OPC operation of the first recording layer. In this case, there is a problem in that the recording is moved to the lead-in area of the inner circumference after the recording on the second recording layer, the recording power information of the first recording layer is acquired, and then moved to the outer circumference of the first recording layer to perform recording.

As described above, when jumping from the multilayer disk to another recording layer, the recording operation is paused to read the recording power information in the OPC area of the other recording layer. In this case, the real-time recording data is stored using a buffer. There is a problem that the buffer capacity becomes large, pick-up wastes unnecessary time, and stable power supply is difficult.

A first object of the present invention is to provide a method of continuously acquiring information of recording power for each layer that may occur when recording a multilayer disk and sequentially recording the multilayer.

A second object of the present invention is to provide a recording method capable of minimizing the distance to repeatedly move the disc inner and outer circumferences while stably supplying the recording power of the specific layer after acquiring the recording power of each layer in advance.

A third object of the present invention is to store information about recording power in each OPC area in advance in a memory in at least a dual layer or more optical disk device, achieve power stabilization according to the movement between recording layers during recording, and recording of pickup during recording. To shorten the time.

A fourth object of the present invention is to provide a method of acquiring information on reproduction power for each layer that may occur when a multilayer disc is reproduced, and sequentially reproducing each multilayer based on the obtained reproduction power.

The recording control method of the multilayer disk according to the present invention for achieving the above object,

A recording power reading step of reading recording power information for each recording layer of the multilayer and storing it in a memory through an optimum power control operation in a specific optimal power control (OPC) area of the multilayer disk; And a recording step of repeating recording of a specific recording layer, moving and recording to another recording layer, and moving and recording to another recording layer based on the recording power information for each recording layer.

Preferably, the recording step,

Recording data with corresponding recording power information from an inner circumference to an outer circumference of the specific recording layer; Moving to another recording layer after completing recording of the specific recording layer; Recording data from the outer circumference of the other recording layer to the inner circumference with the recording power information of the other recording layer; After the recording of the other recording layer is completed, the step of moving for recording of another recording layer is repeated.

Preferably, the optimum power control operation is performed for each recording layer to read recording power information for each recording layer.

Preferably, the specific recording layer and another recording layer are adjacent recording layers.

Preferably, the recording layer different from the specific recording layer is an odd or even recording layer.

Preferably, the specific recording layer is a recording layer farther from the disk surface than the other recording layers.

According to another aspect of the present invention, there is provided a method of reproducing a multi-layer disc, comprising: a reproduction power reading step of reading reproduction power information for each recording layer of the multi-layer disc and storing it in a memory; A reproducing step of repeating the operation of reproducing data recorded in a specific recording layer, moving to another recording layer and reproducing data, moving to another recording layer, and reproducing data based on the reproduction power of each read recording layer; Characterized in that.

Preferably, the reproducing step includes: reproducing data with corresponding reproduction power information from an inner circumference to an outer circumference of the specific recording layer; Moving to another recording layer after reproduction of the specific recording layer; Reproducing data from the outer periphery to the periphery with the corresponding playback power information of the other recording layer after moving to the other recording layer, and repeating the step of moving for reproducing another recording layer after the completion of the reproduction of the other recording layer. It features.

Referring to the accompanying drawings, a recording and reproducing method for a multilayer disc according to an exemplary embodiment of the present invention configured as described above will be described below.

Referring to FIG. 6, the Blu-ray disc 130 is supported by the clamper 120 at the center, and the first and second recording layers Layer 2 and Layer 1 are formed, and the clamping area and the lead-in are formed in the inner circumference. A lead-in zone is divided and allocated, a user data area is assigned to a center, and an outer zone is assigned to an outer periphery.

In the lead-in area of the first recording layer and the second recording layer, each PIC data zone may be the same or may be configured as a PIC data area for each recording layer. Both reproduction and recording optical power adjustment data for the first recording layer and the second recording layer can be recorded in the same manner. Preferably, each recording layer contains reproduction and recording optical power adjustment data of the recording layer.

For example, when the high density multilayer optical disc is a Blu-ray disc having a first recording layer and a second recording layer, the lead-out area formed in the inner circumference of the second recording layer and the lead-out formed in the inner circumference of the first recording layer The same disk information DI is recorded and managed in a PIC data area which is separately assigned to the area. The disk information includes a disk information ID and disk structure information as shown in FIG. 7. As the disc structure information, information that can be identified as a dual layer optical disc, for example, '0000 0010' is recorded.

FIG. 7 is a diagram showing a case where disk information of all layers is managed for each PIC data area of each recording layer.

Referring to FIG. 7, when the disc structure information is '0000 0001', it indicates that the disc is a single layer optical disc, and when it is '0000 0011', it means that it is a three layer optical disc. The recording management may be performed at a value corresponding to the number of recording layers of the layer optical disc.

Further, the disc information includes maximum dc read power for Layer 1 information for adjusting the reproduction optical power of the first recording layer, and maximum DC reproduction power for adjusting the reproduction optical power of the second recording layer. Maximum dc read power for Layer 2 information, and maximum HF modulated read power for Layer 1 information and the maximum HF modulated read power for the second recording layer. Layer 2) Information is recorded and included.

Then, at the normal recording speed for adjusting the optical power of the second recording layer and the write power settings at the nominal recording velocity for Layer 1 information for adjusting the recording optical power of the first recording layer. Write power settings at Nominal Recording velocity for Layer 2 information, Write power settings at Maximum Recording velocity for Layer 1 information and highest of second recording layer Write power settings at Maximum Recording velocity for Layer 2 information at recording speed, and Write power settings at Minimum Recording velocity for Layer 1 information at first recording layer Write power settings at Minimum Recording velocity for Layer 2 at the minimum recording speed of the two recording layers are recorded.

On the other hand, when the high-density multilayer optical disc according to the present invention is a three-layer optical disc, reproduction and recording optical power adjustment data recorded in the disc information are stored in the first recording layer, the second recording layer, and the third recording layer. In the case where the high-density multilayer optical disc according to the present invention is an N-layer optical disc, the reproduction and recording optical power control data recorded in the disc information are stored in N recording layers. (Layer 1 to Layer N) can be recorded and managed respectively.

As shown in Fig. 6, the recording method of a Blu-ray disc having a dual layer is as follows.

First, an optimum power control (OPC) operation is performed using PIC data in a lead-in area of a disc to read recording power information for the first recording layer and the second recording layer, respectively. Recording power information of each read recording layer is stored in a memory (not shown), respectively.

Here, the OPC operation in each recording layer may be performed for each recording layer to read the recording power information of each recording layer, or may be changed by using the recording power information of the entire recording layer recorded in the OPC area of the specific recording layer. The recording power information of each recording layer can be read by compensating the recording power information of the recording layer.

Thereafter, recording is performed while moving from the inner circumference to the outer circumference of the second recording layer based on the recording power information of the second recording layer for recording the data of the second recording layer (W11), and the recording of the second recording layer is completed. If so, it moves to the first recording layer. Then, the first recording layer is recorded from the outer circumference of the first recording layer to the inner circumference using the recording power information of the first recording layer (W12). The second recording layer is a layer formed at a position farther from the disk surface than the first recording layer.

Here, since recording of the second recording layer and recording of the first recording layer are started at the same time as the recording of the second recording layer is completed, the recording of the first recording layer is started. Therefore, the continuous recording operation can be performed with minimum time delay. Can be.

That is, the recording power information for each OPC area of each layer or the recording power information for the N recording layers in one layer of the OPC area is read, and then sequentially recorded from the Nth recording layer to the other recording layers. Can be performed. As another embodiment, when there are N recording layers, the recording layers sequentially recorded may be even or odd layers. For example, continuous data may be recorded only in an even layer of the N recording layers.

8 shows a configuration of an optical disc apparatus to which the optical recording control method according to the present invention is applied, for example, a video disc recorder (VDR) for recording or playing back signals on a Blu-ray disc. The optical disc apparatus includes: an optical pickup 110 for reading out a signal recorded on a high density multilayer optical disc 130 such as a BD-RW Dual layer, or recording a data stream processed from an external signal; A VDR system 151 for reproducing a signal read out from the optical pickup 110 or converting a data stream input from the outside into a data stream suitable for recording; The encoder 152 may be configured to encode an analog signal input from the outside and output the analog signal to the VDR system.

On the other hand, in the VDR system 151 of the optical disk device, as shown in FIG. 9, when a high density multilayer optical disk, for example, the Blu-ray disk 200 is inserted and seated, a series of optical disk loading operations are performed. It is performed (S101). When a data recording request is received from a user (S103), the optical pickup 150 is moved to access a lead-in area allocated to the first and second recording layers of the Blu-ray disc 130 to access the lead-in area. The recording power information for the first recording layer and the second recording layer is read (S105).

That is, in step S101, the OPC of the disc information DI, the defect management information (DMA), and the PIC information recorded in the lead-in area of the Blu-ray Disc (BD-RW dual layer) through the optical disk loading operation. The area and the like are read out and stored in a memory (not shown) provided in the apparatus.

In the step S105, when a data recording key is received from the user, the VDR system 151 searches for the disk information stored in the memory and includes the recorded data in the disk information. Optical power adjustment data for the first recording layer and the second recording layer are read out respectively. Subsequently, with reference to the optical power control data for the read first and second recording layers, the recording optical power of the laser diode LD included in the optical pickup is adapted to the first recording layer and the second recording layer. It performs a series of optical power adjustment operations (OPC process) to adjust.

Thereafter, the VDR system 151 records the data stream while moving the optical pickup 150 from the inner circumference to the outer circumference of the second recording layer of the disc (S107). At this time, writing to the second recording layer is performed by using the recording optical power of the second recording layer stored in the memory.

The VDR system 151 jumps the disk focus of the optical pickup 150 from the outer circumference of the second recording layer to the outer circumference of the first recording layer when the recording of the second recording layer is completed (S109). Recording is performed while moving from the outer circumference of the recording layer to the inner circumference. In this case, the recording of the first recording layer is performed by using the recording optical power of the first recording layer stored in the memory (S111).

10 is a diagram showing a recording method in the case of a Blu-ray disc having N recording layers according to the present invention.

Referring to FIG. 10, a Blu-ray disc is inserted to perform a loading operation and receive a data recording request from a user (S121 and S123).

In this case, the OPC operation is performed by reading the recording power information for the N layers from the OPC area of the lead-in area allocated to the inner circumference of the Blu-ray disc, and storing the recording power information for each recording layer in the memory (S125). ).

Then, in order to record sequentially from the Nth recording layer, the Nth recording layer performs recording from the inner circumference to the outer circumference of the Nth recording layer based on the recording power information of the Nth recording layer (S127).

When the recording of the Nth recording layer is completed, the N-1 recording layer is moved to record the recording of the N-1th recording layer in the inner circumference based on the corresponding recording power information (S129 and S131). At this time, the recording can be performed while jumping from the outer periphery where the recording of the Nth recording layer is completed to the outer periphery of the N-1 recording layer and immediately moving from the outer periphery of the N-1 recording layer to the inner periphery.

Thereafter, by subtracting the counter values one by one to record for the N recording layers, a jump is made to another recording layer, so that the recording for the N recording layers can be sequentially recorded in an inner-outer-outer-outer-inner direction. do.

11, after confirming that the Blu-ray Disc is loaded and receiving a data recording request from the user (S141, S143), when the data recording request is received from the user, the OPC operation is performed through the OPC area located in the lead-in area of the disk. After that, the recording power of the multi-layer is read out (S145).

At this time, recording is performed based on the recording power information of the corresponding recording layer from the inner circumference of the upper layer to the circumferential direction, and after jumping, the recording is performed based on the recording power information of the recording layer while moving from the outer circumference of the lower layer. (S147, S149, S151).

When a data reproduction request is received from the user (S153), the reproduction power of each recording layer is read out and stored in the memory (S155). Thereafter, playback is performed from the inner circumference of the upper layer to the outer circumference, and when the recording layer is completed, the playback is continued from the outer circumference of the lower layer to the inner circumference after the jump (S157, S159, S161).

In this way, after the optimal recording power or reproduction power for the N recording layers is stored in the memory, it does not move to the lead-in area after recording or reproducing a specific recording layer, but immediately jumps to another recording layer and then jumps to the jumped position. Alternatively, the playback operation can be continued.

Therefore, an optical power adjustment operation suitable for a plurality of recording layers formed on a high density multilayer optical disc such as a Blu-ray disc is made quickly, so that data recording or reproducing operation can be performed more quickly and continuously even when jumping between recording layers. do.

Further, in the state where optical power control data suitable for a plurality of recording layers formed on a high-density multilayer optical disc such as a Blu-ray disc are sequentially read out from a specific area separately assigned to each recording layer and stored in a memory, each recording layer By performing the optical power control operation with respect to the power reading, jumping and recording or reproducing operations, the recording or reproducing operation can be performed more quickly and continuously.

So far, the present invention has been described with reference to the preferred embodiments, and those skilled in the art to which the present invention pertains to the detailed description of the present invention and other forms of embodiments within the essential technical scope of the present invention. Could be implemented. Here, the essential technical scope of the present invention is shown in the claims, and all differences within the equivalent range will be construed as being included in the present invention.

As described above, the present invention provides a method for controlling recording and reproducing of an optical pickup apparatus according to the present invention, wherein all optical power control data for a plurality of recording layers formed on a high density multilayer optical disc such as a Blu-ray disc or the like is stored in each recording layer. After reading and storing from a specific area, the data recording or reproducing operation can be continuously performed with reference to the stored optical power adjusting data, thereby making the optimum optical power adjusting operation for each recording layer possible. According to the present invention, it is possible to quickly and variably adjust, and also, when jumping between recording layers, the optimum optical power adjustment operation can be quickly and variably adjusted, so that the data recording or reproducing operation can be performed more continuously. have.

In addition, when Blu-ray Disc is applied in Blu-ray related optical pickup device, it is possible to stably change the power change that can be caused by changing the layer during recording, and to improve recording performance by maintaining proper recording power at all times. In addition, there is an effect that can reduce the fast recording characteristics and power consumption by reducing the travel time of the pickup during recording.

1 shows a disc structure for a typical CD / DVD disc.

2 is a cross-sectional view showing the structure of a high density dual layer optical disk;

3 is a block diagram showing an optical pickup device for a high density dual layer optical disk.

4 is a diagram showing a recording method of a conventional high density dual layer optical disk.

Fig. 5 is a flowchart showing a recording method of a conventional high density dual layer optical disk.

6 is a diagram showing a recording method of a high density dual layer optical disk according to the present invention;

FIG. 7 conceptually illustrates a state in which a PIC data area is included in a lead-in area of a high density dual layer optical disk according to the present invention. FIG.

8 is a diagram showing a configuration of an optical disk apparatus to which the optical recording method of the high density dual layer optical disk according to the present invention is applied.

9 is a flow chart showing a recording control method for a multilayer disc according to an embodiment of the present invention.

10 is a flow chart showing a recording control method for a multilayer disc according to an embodiment of the present invention.

11 is a flowchart illustrating a recording and reproducing control method for a multilayer disc according to an exemplary embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

110 Optical pickup 111 Objective lens

112 ... collimator lens 113 ... laser diode

120 ... clamper 130 ... Blu-ray Disc

151 ... VDR System 152 ... Encoder

Claims (8)

A recording power reading step of reading recording power information for each recording layer of the multilayer and storing it in a memory through an optimum power control operation in a specific optimal power control (OPC) area of the multilayer disk; A recording step of repeating recording of a specific recording layer, moving and recording to another recording layer, and moving and recording to another recording layer based on the recording power information for each recording layer. How to control recording on the disc. The method of claim 1, The recording step, Recording data with the corresponding recording power information from the inner circumference to the outer circumference of the specific recording layer; Moving to another recording layer after completing recording of the specific recording layer; Recording data from the outer circumference of the other recording layer to the inner circumference with the recording power information of the other recording layer; And after the recording of the other recording layer is completed, the step of moving for recording of another recording layer is repeated. The method of claim 1, And the optimum power control operation is performed for each recording layer to read recording power information for each recording layer. The method of claim 1, And a recording layer different from the specific recording layer is an adjacent recording layer. The method of claim 1, And a recording layer different from the specific recording layer is an odd or even recording layer. The method of claim 1, And the specific recording layer is a recording layer farther from the disk surface than other recording layers. A reproduction power reading step of reading reproduction power information for each recording layer of the multilayer disc and storing the same in the memory; A reproducing step of repeating the operation of reproducing data recorded in a specific recording layer, moving to another recording layer and reproducing data, moving to another recording layer and reproducing data based on the reproduction power of each read recording layer; A playback control method for a multilayer disc, characterized by the above-mentioned. The method of claim 7, wherein The playback step, Reproducing data with corresponding reproduction power information from an inner circumference to an outer circumference of the specific recording layer; Moving to another recording layer after reproduction of the specific recording layer; Reproducing data from the outer circumference to the inner circumference with the corresponding reproduction power information of another recording layer after moving to the other recording layer; And reproducing the reproducing of the other recording layer for reproducing another recording layer.