KR100640317B1 - Method for optimum power calibration in optical disc driver - Google Patents

Abstract

The present invention relates to a method of performing an OPC of an optical disc apparatus, which enables an OPC operation by immediately moving to an OPC start position when a recording command is generated, comprising: detecting and storing an OPC start position of the optical disc when an optical disc is inserted and mounted; And performing an OPC operation from the detected and stored start position when a recording command is generated, detecting and storing the OPC start position in advance before a recording request, and immediately moving to the detected and stored OPC start position at the time of the recording request. By doing so, the time required for the OPC operation is shortened, so that the recording operation can be performed quickly without delay, and the OPC operation can be performed within the buffering available time of the recording data, thereby minimizing the system load.

OPC, PSN, PCA, Servo Initialization, Write Command

Description

Method for optimum power calibration in optical disc driver

1 is a block diagram of an embodiment of an optical disk device in which an OPC performing method according to the present invention is implemented.

2 is a flowchart illustrating a preferred embodiment of the method for performing OPC of the optical disk device according to the present invention.

※ Explanation of code for main part of drawing

10: optical disc 11: spindle motor

20: optical pickup 21: sled motor

30a: digital recording signal processor 30b: digital reproduction signal processor

40: channel bit encoder 41: optical driver

50: R / F section 60: drive section

61: servo unit 70: microcomputer

71: memory

The present invention relates to a method for performing OPC of an optical disc apparatus that detects and stores an OPC start position in advance before a write command is generated, so that the OPC operation can be performed by immediately moving to the OPC start position when a write command is generated.

In a typical optical disk device, an OPC (Optimum Power Calibration) operation is performed on an inserted optical disk in order to record data at an optimal recording power suitable for device and disk characteristics. The conventional OPC operation is as follows.

First, as the optical disc is inserted and mounted, a predetermined initialization operation (for example, disc recognition and servo initialization, etc.) is performed, and when a recording command is generated in such a state, a recording operation is performed. The OPC operation is performed from the searched position by searching the OPC start position (PSN (Physical Sector Number)) in the set PCA (Power Calibration Area), so that the recording operation is performed at the optimal recording power.

However, in the related art, as described above, the OPC start position search and the OPC operation are performed according to the generation of the recording command, and thus, the OPC operation takes a lot of time, and the recording operation is somewhat delayed. When the recording operation is performed, there is a problem in that the recording operation is greatly delayed. Also, since there is a limit in the available buffering time of the recording data, searching for the starting position of the OPC operation after the recording command as described above adds to the load on the system. there was.

Accordingly, the present invention has been created to solve the above problems, by detecting and storing the OPC start position in advance of the recording command, and immediately moves to the OPC start position detected and stored when the recording command is generated to perform the OPC operation, OPC operation It is an object of the present invention to provide a method for performing an OPC of an optical disc device, which can shorten the time required for this, and thereby minimize the delay of the recording operation and the system load.

According to an aspect of the present invention, there is provided a method of performing an OPC of an optical disk apparatus, the method comprising: detecting and storing an OPC starting position of the optical disk when the optical disk is inserted and mounted; And performing an OPC operation from the detection stored start position when a write command is generated.

Hereinafter, a preferred embodiment of an OPC performing method of an optical disk device according to the present invention will be described with reference to the accompanying drawings.

1 is a block diagram of an embodiment of an optical disk device in which an optimal recording power detection method according to the present invention is implemented. The digital recording signal converts an input digital data into a recording format by adding an error correction code (ECC) or the like. A processing unit 30a; A channel bit encoder (40) for reconverting the data converted into the recording format into a bitstream; An optical driver 41 for outputting a light quantity driving signal according to the input signal; An optical pickup (20) for recording a signal on the optical disc (10) in accordance with the light quantity driving signal and for detecting a recording signal from the recording surface; An R / F unit 50 for shaping the signal detected by the optical pickup 20 and reproducing and outputting the binary signal; A drive unit 60 for driving the spindle motor 11 for rotating the optical disc 10 and the sled motor 21 for conveying the optical pickup 20, respectively; A servo unit 61 for controlling the driving of the drive unit 60 according to the tracking error signal T.E and the focusing error signal F.E of the optical pickup 20 and the rotational speed of the optical disc 10; A digital reproduction signal processor (30b) for restoring the binary signal to original data with its own clock synchronized with the binary signal; A memory (EEPROM) 71 in which target beta (Target β), target gamma (Target γ), target power (reference power) values, etc. for each recording speed by disc manufacturer (disk code) are pre-stored in the form of firmware; And detecting and storing the starting position of the OPC operation in advance before the recording command is generated, performing the OPC operation from the detected and stored starting position when the recording command is generated, and controlling the requested recording operation by applying the optimum recording power detected through the OPC operation. It is configured to include a microcomputer 70 to perform.

FIG. 2 is a flowchart illustrating a method of performing an OPC of an optical disk device according to the present invention. Hereinafter, the method of performing an OPC of FIG. 2 according to the present invention will be described in detail with reference to the configuration of FIG. 1.

First, as the optical disc 10 is inserted and mounted (S10), the microcomputer 70 performs a predetermined initial operation such as disc recognition and servo initialization (S11), and then detects an OPC starting position for the optical disc 10. To this end, the microcomputer 70 performs the test of the inner peripheral PCA when the optical pickup 20 is a test area of the inner peripheral side PCA (the optical disk is a high-density disk (DVD-R, DVD-RW, etc.)). The area is moved to the initial position of a 6832 sector (usually PSN 01E800h), and the optical pickup 20 is controlled to move in the circumferential direction of the optical disc 10 from the moved position.

Accordingly, the optical pickup 20 moves in the circumferential direction from the moved position, and the microcomputer 70 has a current position in the test area of the PCA from a signal output according to the movement of the optical pickup 20. It is determined whether the data is an unrecorded area. An example of this is as follows.

The R / F unit 50 generates a RECD signal from the signal output as the optical pickup 20 moves, and outputs the RECD signal to the microcomputer 70. In this case, the R / F unit 50 When the current position of the optical pickup 20 is a data recording area, a 'H' signal is output as a RECD signal, and a 'L' signal is output as a RECD signal when the data is unrecorded area.

The microcomputer 70 continuously monitors the generated and output RECD signal. When the RECD signal is detected as 'L' during the monitoring, the microcomputer 70 determines the current position of the optical pickup 20 as an unrecorded area and determines the current position. Is detected as the OPC start position (OPC_Start_PSN), and the detected OPC start position is stored in a global variable (S12).
The global variable is a storage variable for storing the detected OPC start position as in the above process, and in order to know the detected OPC start position, the OPC start position is recognized by reading a value stored in the global variable.

In this state, when a recording command is generated according to a recording request of the user (S20), the microcomputer 70 reads the value stored in the global variable, recognizes the OPC start position, and moves to the recognized OPC start position. The optical pickup 20 is immediately moved, and the OPC operation is performed from the moved OPC start position (S21). The OPC operation will be briefly described as follows.

First, the microcomputer 70 detects the target power corresponding to the code and the OPC recording speed of the optical disc 10 from the memory 71, and records the detected target power based on the detected target power (for example, 9 mW). An adjustment signal for changing the power by a predetermined predetermined magnitude is applied to the optical driver 41.

Accordingly, the optical driver 41 outputs a recording signal for test data with optical driving power corresponding to the applied control signal, and the optical pickup 20 outputs the output signal from the moved OPC start position. The recording starts, and for a recordable optical disc (e.g., DVD-R), test data of 1 ECC block (16 sectors) is recorded in one OPC operation.

In this manner, when the recording of the test data is completed, the microcomputer 70 controls the optical pickup 20 to sequentially read the recorded test data, and detects reproduction characteristics of the sequentially read data. If the optical disc 10 is a recordable disc (for example, DVD-R), the microcomputer 70 detects a beta (β) value from the reproduction RF signal (the beta value is a reproduction RF signal). And a curve function obtained as described above after fitting the function of the curve by each recording power obtained the detected beta value when the beta value detection is completed, and the optical disc 10 The optimum recording power is detected from the target beta value of the memory 71 corresponding to the code of " OPC "

In the above, if the optical disc 10 is a rewritable disc (DVD-RW), instead of the beta value, a modulation degree, which is an index indicating an amplitude size of a reproduction RF signal for the test data, is obtained. The gamma (γ) value is detected from the characteristics of the modulation degree, and the optimum recording power is detected therefrom.

When the OPC operation is completed (S30), the microcomputer 70 controls and performs the recording operation by applying the optimum recording power detected through the OPC operation until the end of recording (S31, S40).

As described above, in the present invention, the OPC start position is detected and stored in advance before the recording command is generated, and when the recording command is generated, the OPC operation is immediately performed to perform the OPC operation by performing the OPC operation within the available buffering time of the recording data. do.

Meanwhile, the above embodiment according to the present invention can be applied to the case where the OPC operation is performed by the PCA on the outer side. In this case, the OPC start position is detected and stored by the outer PCA before the recording operation request. When the recording operation is requested, the controller immediately moves to the detected stored position to perform the OPC operation.

The above-described preferred embodiments of the present invention are disclosed for purposes of illustration, and those skilled in the art can improve, change, and modify various other embodiments within the spirit and technical scope of the present invention disclosed in the appended claims. Replacement or addition may be possible.

OPC performing method of the optical disk device according to the present invention as described above, by detecting the OPC start position in advance before the recording request, and immediately moved to the OPC start position detected and stored at the recording request to perform the OPC operation, It is a very useful invention that the time required is shortened so that the recording operation can be performed quickly without delay, and that the OPC operation can be performed within the buffering available time of the recording data, thereby minimizing the system load.

Claims (5)

Detecting and storing an OPC start position for optimum recording power control (OPC), regardless of a recording command, when an optical disc is inserted and mounted; Monitoring whether a recording command occurs; And performing an optimal recording power control (OPC) operation from the OPC starting position by reading the stored OPC starting position when a write command is generated. The method of claim 1, And detecting and storing the start position of the OPC after performing the servo initialization operation according to the optical disc insertion and mounting. The method of claim 1, The OPC start position detection is a method of performing OPC of an optical disc apparatus, characterized in that it detects a PSN (Physical Sector Number) on the optical disc to start the OPC operation. The method of claim 1, And the OPC operation is performed within a buffer available time of recording data. The method of claim 1, And performing a recording operation by applying the optimum recording power detected through the OPC operation.

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