KR100682147B1 - Recording method for optical recorder - Google Patents

Abstract

A recording method of an optical recording/reproducing device is provided to be capable of calibrating recording power suited to an optical recording medium in consideration of a proper LPP(Land Pre-Pit) detection level of jitter OPC(Optimum Power Control) for setting the suited recording power, thus stabler and improved recording performance of system media is ensured. After a type of an inserted disk is recognized, test data is recorded on the disk based on predetermined target power(S301,S302). A reproduction signal proportionate to lightness reflected by the recorded test data is detected. If a recording process is completed after the recording process of the test data is repeated as much as set frequency while recording power of the test data is changed, a beta value where an amount of jitters becomes minimum is calculated by using a variable(beta value) corresponding to vertical symmetry of waveform from the reproduction signal(S303-305). N(N is a positive integer) optimum power is stored on the basis of recording power where the jitters become minimum, and LPP detection levels for individual optimum power are obtained(S306). Recording power having the best LPP detection level is set to optimum recording power, and the optimum recording power is recorded(S307).

Description

Recording method of optical record player {RECORDING METHOD FOR OPTICAL RECORDER}

1 is a block diagram of a general optical recorder;

2 is a flowchart showing a recording process of an optical recorder according to the prior art;

3 is a flowchart showing a recording process of the optical recorder according to the present invention;

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

11 disc 12 optical pickup unit

13: recording pulse generator 14: laser diode driver

15 controller 16 memory

17: RF signal amplifier 18: signal processor

The present invention relates to a recording method of an optical recorder, and more particularly, to a method of recording information by setting a recording power suitable for an optical recording medium.

In general, an optical recording medium is a read-only disc such as a CD-ROM (CD-Read Only Memory), a DVD-ROM or the like, and a CD-WORM (CD-Write Once Read Many) or the like, depending on whether recording is possible. Discs can be classified as recordable discs and discs capable of repeatable recording, such as CD-Rewritable (CD-RW) and DVD-Random Access Memory (DVD-RAM).

On the other hand, the recording area arrangement of the recordable discs includes a power calibration area (PCA), a program memory area (PMA), a lead-in area, a program area, and a lead-out area. Separated by. Here, the PCA is an area for calibrating the laser recording power for recording data on the disk, and the PMA has head address information of the track on which data is recorded in the program area. Further, data recording information and the like stored in the program area are recorded in the lead-in area and the lead-out area, and actual data to be recorded on the disc is recorded in the program area.

An optical recording / reproducing apparatus for recording and reproducing information on such an optical recording medium drives a laser diode to irradiate a relatively large energy light beam that can change the physical characteristics of the information recording layer existing on the optical disk, thereby providing information to the optical disk. The information is reproduced from the optical disc by using a light beam of small energy that does not change the physical characteristics of the information recording layer.

As shown in FIG. 1, the optical recorder includes a recording pulse generator 13 for generating an actual recording pulse by including auxiliary information from the controller 15 in recording information transmitted from a host (not shown). The laser diode driver 14 and the disc 11 which drive the laser diode included in the optical pickup unit 12 according to the recording pulse generated by the recording pulse generator 13 and the laser power level set by the controller 15. Amplified by the optical pickup unit 12 for detecting the optical signal reflected from the optical signal, the RF signal amplifier 17 for amplifying the RF signal detected by the optical pickup unit 12, and the RF signal amplifier 17 And a signal processor 18 for reproducing the RF signal.

The recording process of the optical recorder configured as described above will be described with reference to FIG. 2. First, the control unit 15 that recognizes the type of the inserted disc 11 (S201) may select a recording power suitable for the disc 11. Optimal Power Control (OPC) process is inevitably performed.

Referring to the OPC process, the test data is written to the PCA of the disk 11 on the basis of a predetermined target power by driving a laser diode provided in the optical pickup unit 12 (S202), which is proportional to the amount of reflected light. The optical pickup unit 12 detects a reproduction signal (ie, an RF signal). The recording of the test data is repeated as many times as the setting power while changing the recording power. When the recording of the test data is completed (S203), the controller 15 changes the variable corresponding to the vertical symmetry of the reproduction signal waveform transmitted through the signal processor 18. Using the (beta value), a beta value in which the jitter amount is minimized is calculated (S204), and a recording power proportional to the beta value is selected (S205).

Then, the optimum recording start power is set from the recording power selected in the OPC process in consideration of the current recording speed. Here, the recording start power has a proportional increase characteristic as the speed increases.

Next, the data to be recorded is recorded on the disc 11 at the recording start power set in accordance with the file structure.

However, in -series media, address linking of LPP (Land Pre-Pit) in addition to the recording power has a very important effect on the recording quality. LPP is used to carry out the address linking operation when recording the series media. This LPP information must be read for proper address linking to facilitate writing. However, the LPP detection probability varies greatly depending on the power level. That is, in the case of -series media, sometimes a serious error occurs in the detection of the LPP.

In order to properly detect the LPP signal, the LPP signal can be detected in order to detect the LPP signal since the power is most sensitive to the servo power, and the EFM signal recorded at the power has a significant effect on the detection of the LPP lever by acting as a wobble noise. Optimum power for optimal detection is also very important.

The present invention has been proposed to compensate for the shortcomings of the prior art, by calibrating properly considering the LPP detection level in the jitter OPC for setting the recording power suitable for the optical recording medium-more stable and improved The purpose is to ensure recording performance.

The recording method of the optical recorder according to the present invention for realizing the above object is a method of recording data on an optical recording medium with a predetermined recording start power, the target power being defined after recognizing the type of the inserted disc. Recording test data on the disk, detecting a reproduction signal proportional to the amount of light reflected by the recorded test data, and repeating recording of the test data for a predetermined number of times while changing the recording power of the test data. After the recording is completed, calculating a beta value that minimizes jitter by using a variable (beta value) corresponding to the up and down symmetry of the waveform in the reproduction signal, and based on the recording power that minimizes jitter. Storing N optimal powers (where N is a positive integer) and obtaining an LPP detection level for each optimal power; Selecting the recording power having the best detection level as the optimal recording power, and performing recording.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

The recording method of the optical recorder according to the present invention can be performed by the optical recorder shown in FIG.

As described above, the optical recorder according to the present invention includes a recording pulse generator 13 for generating an actual recording pulse by including auxiliary information from the controller 15 in recording information transmitted from a host (not shown), and recording. In the disk 11 and the laser diode driver 14 for driving the laser diode included in the optical pickup unit 12 according to the recording pulse generated by the pulse generator 13 and the laser power level set by the controller 15. An optical pickup unit 12 for detecting the reflected optical signal, an RF signal amplifier unit 17 for amplifying the RF signal detected by the optical pickup unit 12, and an RF signal amplified by the RF signal amplifier unit 17 And a control unit 15 for reproducing the data, and a control unit 15 for performing calibration in consideration of the LPP detection level in the jitter OPC for setting the recording power suitable for the optical recording medium.

A recording process performed in the optical recorder configured as described above will be described below with reference to FIG. 2.

First, the controller 15, which recognizes the type of the inserted disc 11 (S301), drives the laser diode provided in the optical pickup unit 12 as an OPC process for selecting a recording power suitable for the disc 11. The test data is recorded in the PCA of the disk 11 on the basis of the predefined target power (S202).

The optical pickup unit 12 detects a reproduction signal (that is, an RF signal) proportional to the amount of light reflected by the recorded test data.

Here, the recording of the test data is repeated as many times as the setting power while changing the recording power. When the recording of the test data is completed (S303), the controller 15 corresponds to the vertical symmetry of the reproduced signal waveform transmitted through the signal processor 18. Using a variable (beta value) to calculate a beta value of the jitter (minimum jitter) (S304).

The controller 15 stores N optimal powers (S305) in the memory 16 based on the recording power at which jitter is minimum (S305), and LPP detection for each optimal power. The level is obtained (S306).

Next, the recording power having the best LPP detection level is selected as the optimal recording power (S307).

Then, the optimum recording start power is set from the recording power selected in the OPC process in consideration of the current recording speed. Here, the recording start power has a proportional increase characteristic as the speed increases.

Next, the data to be recorded is recorded on the disc 11 at the recording start power set in accordance with the file structure.

On the other hand, the recording power setting and recording process of the present invention as described above may be selectively performed only when the type of the disc is determined as -series media in step S301. That is, in the case of non-series media, as in the prior art, the LPP detection level is not taken into account when setting the recording power.

It has been described so far limited to one embodiment of the present invention, it is obvious that the technology of the present invention can be easily modified by those skilled in the art. Such modified embodiments should be construed as naturally included in the technical spirit described in the claims of the present invention.

As described above, the present invention has the effect of ensuring a more stable and improved recording performance of the -series media by calibrating properly considering the LPP detection level during the jitter OPC for setting the recording power suitable for the optical recording medium.

Claims (3)

A method of recording data on an optical recording medium with a predetermined recording start power, Recognizing the type of the inserted disc and recording test data on the disc based on a predetermined target power; Detecting a reproduction signal proportional to the amount of light reflected by the recorded test data; After the recording of the test data is repeated for a predetermined number of times while changing the recording power of the test data, when the recording is completed, the amount of jitter is minimized by using a variable (beta value) corresponding to the vertical symmetry of the waveform in the reproduction signal. Calculating a beta value of Storing N optimum powers based on the recording power at which the jitter is the minimum, wherein N is a positive integer, and obtaining an LPP detection level for each optimum power; Performing recording by selecting a recording power having the best LPP detection level as an optimal recording power. Recording method of the optical record player comprising a. The method of claim 1, The recording method includes performing recording after setting the recording start power in consideration of the current recording speed from the selected recording power. The recording method of the optical recorder, characterized in that. The method of claim 1, The recording method is to perform subsequent optimal recording power setting when the type of the inserted disc is recognized as -series media. The recording method of the optical recorder, characterized in that.

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