KR100680170B1 - Data writting method for a Disc - Google Patents

Abstract

The present invention relates to a data recording method of an optical disk, and reads the RF level of the last recorded data area during the recording standby time for data buffering of the B / E, and re-measures the current Beta value, for each measured value and MID. The data can be stably recorded on the optical disk by recording the measured optical power by comparing the difference with the specified Target Beta value.

Optical power, beta, β, β compensation

Description

Data recording method for an optical disc

1 is a view showing the configuration of an embodiment of an optical disk device in which the recording optical power compensation method of the optical disk device according to the present invention is implemented;

And,

2 is a flowchart illustrating a recording optical power compensation method of the optical disk apparatus according to the present invention.

* Description of symbols on the main parts of the drawings *

110: optical disk 120: drive section

130: server 140: control unit

150: DSP 150a: digital recording signal processing unit

150b: digital reproduction signal processing unit 160: channel bit encoder

170: optical driver 180: RF

190: optical pickup

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical recording apparatus, and more particularly, to a data recording method of an optical disk capable of stably adjusting recording optical power.

In general, an optical disk apparatus performs an OPC (Optimum Power Calibration) operation on a test area of an optical disk to detect an optimal recording optical power (Popt) for an inserted optical disk, and detects the optimal recording optical power during the recording operation. The recording operation is performed by using.

However, even if the optimum recording power has been obtained by OPC, good recording characteristics cannot be obtained if the recording environment changes during the actual recording. For example, beam spots may occur due to fluctuations in power sensitivity for each position on the optical disc, or because the wavelength of the LD is shifted to high temperatures, or because of disc skew, disc thickness and focus defocus. ), The actual recording is performed after a long time after performing the OPC, or the disc and / or optical conditions are changed, so that the optimal recording power determined by the above-described OPC is changed and recorded. The beta of the signal is changed so that good recording characteristics cannot be obtained.

In other words, the optimum power of OPC is found according to the target Beta determined for each MID, but due to the problems of DISC Tilt, Pick-up temperature characteristics, internal and external circumferential reflectance difference, Servo or APC

The power found by the OPC at the start of recording is not maintained at the optimum power until the end of recording. In this case, it is not a problem at the start of recording, but recording for a long time increases the temperature of the pick-up, or causes serious problems in the recording quality of the DISC with a large difference in tilt or reflectance.

 The present invention is to solve the above problems, by reading the RF level of the last recorded data area to re-measure the current Beta value, and compares the difference between the measured value and the Target Beta value determined after performing OPC Write Power It is intended to provide an optimal power maintenance method to allow a slow adjustment.

The data recording method of the optical disc according to the present invention for achieving the above object is a setting step of detecting the optimal optical power corresponding to the optimum beta value determined for each MID when recording data to the optical recording device and setting it as a reference beta value, A measurement step of detecting the beta value by detecting the RF level of the final recording signal by searching the final recording area, and adjusting an output optical power by comparing the measured beta value of the measurement step with the reference beta value of the setting step. To be done.

The reference beta value of the setting step is a test recording in a predetermined region of the optical disk with the optimal recording optical power detected through the OPC (Optimum Power Calibration) operation, to measure the RF level of the recorded region to set the reference beta value And the beta value in the measuring step is characterized in that to measure the standby time of the disk drive during data recording on the optical disk.

In the adjusting step, when the value calculated from the difference between the absolute value of the reference beta value and the measured beta value is larger than the set error range, the optical power is output by lowering the predetermined value step by step. The predetermined value for each step is adjusted to a cumulative change amount as a minimum value that can be adjusted according to the performance of the optical recording apparatus.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of an embodiment of an optical disk apparatus in which a recording optical power compensation method of an optical disk apparatus according to the present invention is implemented. The apparatus includes converting an input digital data into a recording format by adding an error correction code (ECC) or the like. The digital recording signal processor 150a, a channel bit encoder 160 for reconverting the data converted into the recording format into a bitstream, an optical driver 170 for outputting a light amount driving signal according to an input signal, and the light amount driving signal R / F unit for recording signals to optical disc 110 and for detecting the recording signals from the recording surface, and for filtering the signals detected in optical pickup 190 to form a filter and outputting them as binary signals. 180), the drive unit 120 for driving the spindle motor M for rotating the optical pickup 190 and the optical disc 110, the tracking error signal TE and the focus error signal FE of the optical pickup 190. And Gwangdis The binary signal is converted into its own clock phase-synchronized to the binary signal output from the servo unit 130 and the R / F unit 180 to control the driving of the drive unit 120 by receiving the rotational speed of 110. The digital reproduction signal processing unit 150b for restoring data and the power increase amount and the recording data set according to the respective recording speeds in consideration of the characteristics of the optical disc 110 inserted or the characteristics of the optical pickup 190 during the recording operation. And a control unit 140 for optimally adjusting the recording optical power by using the β value detected from the reproduction RF signal.

At this time, the control unit 140 is configured to calculate the Beta value by measuring the Top / Center / Bottom level of the recording area RF level as in the conventional method.

2 is a view showing a flow of a preferred embodiment of the recording optical power compensation method of the optical disk apparatus according to the present invention.

As shown, if the optical disk 110 is inserted and mounted (S210), before the recording operation is performed, the controller 140 performs an OPC operation in the PCA region of the optical disk 110 to find the optimal recording optical power. (S212). That is, the optimum optical power corresponding to the optimal beta value determined for each MID is detected.

Preferably, the test recording is performed in a predetermined region of the optical disc using the optimal recording optical power detected through the OPC operation, and the RF level of the recording signal is measured in the region to set the target beta (Target Beta) (S213).

The detected recording optical power is recorded in the user data of the disc (S214), and then it is determined whether the recording medium is a DVD-R (S216).

If it is determined in step S216 that the DVD-R, Beta (β) compensation is performed.

In order to perform β compensation, the mode is first switched to the read mode, that is, the loader is switched to the recording standby mode (S220), and the final recorded area is found (S222).

A beta (β) value is calculated through an OPC operation process based on the RF level measured in the area recorded in step S222 (S224). In this case, the RF level is measured by measuring the Top / Center / Bottom level.

In a typical OPC (Optimum Power Calibration) operation process, the controller 140 controls an adjustment signal for changing the recording optical power by a predetermined predetermined size based on the target recording optical power (for example, 8 mW) detected from the optical disk 110. The optical driver 170 is applied to the optical driver 170, and the optical driver 170 outputs a recording signal for the test data at an optical driving power corresponding to the applied control signal, and the optical pickup 190 is applied to the test area in the PCA area. A certain amount of test data is recorded.

When recording of the test data is completed, the controller 140 controls the optical pickup 190 to sequentially read the recorded test data, and sequentially reads the test data from the R / F unit 180. Β value is detected from the outputted RF signal.

Since the β value is calculated by measuring the Top / Center / Bottom level of the measured RF level as in the conventional method, detailed description thereof will be omitted.

When the beta value detection is completed in step S224, the control unit 140 checks whether or not the number of times the detected beta value measurement has been performed a predetermined number of times (5 times in this embodiment) (S226). If the number of times is less than five times, the measured β value is stored in the internal memory (S240), and if measured five times, an average of the measured β values is calculated (S228).

Preferably, the predetermined number of times is such that a sufficient number of times is detected to reduce the measurement error value.

When the absolute value of the difference between the measured β value and the target β value is larger than the predetermined value (error range; a), the average value calculated in step S228 is compared with the optical disc β value (Target β value) detected in step S213 (S232). When the power is lowered by 0.1 mW (S250), and the absolute value of the difference between the measured? Value and the target? Value is smaller than a predetermined value,? Compensation is terminated by increasing the recording power by 0.1 mW (S236).

In the above, the predetermined value (a) refers to an error range set for each device characteristic.

Steps S222 to S250 read the RF level of the user data area recorded last during this period because the loader (disc drive) is in standby during the data buffering (A / V data receiving) period of B / E (back-end) during recording. Measure the current β value again and compare the difference between this measured value and the Target Beta value set when OPC is performed to adjust the Write Power. At this time, if the power is changed suddenly, it may cause instability in servo operation. In the case of one time power compensation, only the minimum power change amount (0.1mW increment) of the corresponding optical recorder is changed so that the power is gradually changed by the accumulated change amount. It's searching for power.

In step S216, when the loader is not DVD-R or after the β compensation is performed, the loader proceeds to the waiting state until the next recording (S218), and when it is finished (S219), otherwise, the process is terminated. The optimal optical power is to record in the user data area of the disc.

The recording operation is briefly described as follows.

First, the digital recording signal processor 150a adds an encoding and error correction code (ECC Block) for recording / reproducing reliability to the input data, converts it into a recording format, and outputs the channel bit encoder 160 to digital recording. The digital bitstream output from the signal processor 150a is converted into a pulse width modulated signal for recording on the optical disk 190 and applied to the optical driver 170.

The controller 140 controls the optical driver 170 to output a recording signal by an optical driving current corresponding to the detected optimal recording optical power, and accordingly, the optical driver 170 modulates the applied pulse width. Outputs a signal for recording data at an optical driving power corresponding to the received signal, and the optical pickup 190 records the signal for the output recording data in a user data area of the optical disc 110. The recording operation is performed.

Although the present invention has been described in detail only with respect to the described embodiments, it will be apparent to those skilled in the art that various modifications and variations are possible within the technical scope of the present invention, and such modifications and variations belong to the appended claims.

According to the beta compensation method of the optical disk according to the present invention as described above, the current Beta value is measured again by reading the RF level of the last recorded data area during the recording standby time for B / E data buffering, and the measured value The optical power can be adjusted stably by comparing the difference between the target beta value measured immediately after and OPC.

Claims (5)

In the data recording method of the optical recording device, A setting step of detecting an optimal optical power corresponding to an optimal beta value determined for each MID when recording data to the optical recording device and setting the optimal optical power as a reference beta value; A measurement step of searching for a final recording area to detect an RF level of the final recording signal and measuring a beta value; And And adjusting the output optical power by comparing the reference beta value of the setting step with the measured beta value of the measuring step. In the adjusting step, when the value calculated from the difference between the absolute value of the reference beta value and the measured beta value is larger than the set error range, the optical power is output by lowering a predetermined value step by step, and when it is small, the optical power is raised by a predetermined value. And a data recording method of an optical disc. The method of claim 1, The reference beta value of the setting step is a test recording in a predetermined region of the optical disk with the optimal recording optical power detected through the OPC (Optimum Power Calibration) operation, to measure the RF level of the recorded region to set the reference beta value And a data recording method of an optical disc. The method of claim 1, Beta value in the measuring step is And measuring the standby time of the disk drive for receiving A / V data during recording of data on the optical disk. delete The method of claim 1, The predetermined value for each step is The data recording method of the optical disc, characterized in that the minimum level that can be adjusted according to the performance of the optical recording device.

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