KR20070051411A - Method for setting up an optimal optical power in optical recording/playback device - Google Patents

Abstract

The present disclosure relates to a method for setting an optimal optical power of an optical recording / reproducing apparatus. The present disclosure relates to reading the ADIP information recorded in a specific area of an optical disc inserted in the optical recording / reproducing apparatus, checking the write information, and performing OPC based on the write information. Set the Ttop3 value (pulse period at the start of recording at the 3T mark), perform OPC to select the optical power suitable for recording according to the set Ttop3 value, and then make two-dimensional jitter and optical power based on the OPC information. Analysis, and re-perform OPC by giving a deviation to the set Ttop3 value until the set number of times is reached, and analyze the jitter value and optical power in two dimensions based on the OPC information. The recording is performed by comparing the optical power with the jitter value analyzed in two dimensions and selecting the optical power having the lowest jitter value.

Therefore, the present invention provides the effect of greatly increasing the recording performance when recording data on new media that is not tuned.

Optical recorder, OPC (Optimum Power Control), WS (Write Strategy)

Description

Method for setting up an optimal optical power in optical recording / playback device

1 is a flowchart showing an operation of an optical power setting method of a general optical recording and reproducing apparatus;

2 is a block diagram showing an optical recording and reproducing apparatus for explaining an optimal optical power setting process according to the present invention;

3 is a flowchart showing an operation process of an optimal optical power setting method of the optical recording and reproducing apparatus according to the present invention.

Explanation of symbols on the main parts of the drawings

10: optical pickup

20: recording pulse generator

30: laser diode driving unit

40: microcomputer

50: RF signal amplifier

60: signal processing unit

The present invention relates to a method for setting an optimum optical power.

More particularly, the present invention relates to a method for setting an optimum optical power of an optical recording / reproducing apparatus which can improve recording performance by finding an optimal optical power when recording predetermined data on an optical disc.

As the storage capacity of existing CD-ROM titles has gradually reached its limit, digital versatile discs (DVDs) have recently been in the spotlight as new storage media. DVD is not much different from CD in terms of implementation. That is, the data is recognized on the same principle as the CD for recognizing the data of 0 and 1 by the difference in the amount of light reflected by the laser. The difference is that DVDs have a smaller storage width than CDs.

These CDs and DVDs can be written once such as CD-ROM (CD-Read Only Memory), DVD-ROM, etc., and CD-WORM (CD-Write Once Read Many). Disc, and a disc capable of repeatable recording, such as CD-RW (CD ReWritable), DVD-Random Access Memory (DVD-RAM).

The optical recording and reproducing apparatus for recording and reproducing information on such an optical disc drives the laser diode to record information on the optical disc by irradiating a light beam of relatively large energy that can change the physical characteristics of the information recording layer existing on the optical disc. In addition, information is reproduced from the optical disc using a light beam of small energy that does not change the physical characteristics of the information recording layer. In this case, forming a pit by a predetermined length on the disk is referred to as a write strategy.

At this time, the laser light is incident on the opposite side of the reflective surface with a pit. Therefore, the pit appears as a projection when viewed from the laser incident side.

Pits are 0.4 to 0.6 mu m in width, and the length of one pit and the interval between the pit and the pit are divided into 3T to 11T for CD series and 3T to 14T for DVD series. Here, T means the length of one clock pulse, 3T means three clock pulses, and 11T corresponds to the length of 11 clock pulses.

Before storing information on such an optical disc, the optical recording / reproducing apparatus performs an optimal power control, that is, an OPC (Optimum Power Control) process, to set a recording power suitable for the inserted optical disc.

1 is a flowchart showing the operation of the optical power setting method of the general optical recording and reproducing apparatus as described above.

As shown, the optical recording / reproducing apparatus judges whether the optical disk is inserted according to a user's operation to record predetermined data (S1), and when the optical disk is inserted, the ADIP (ADdress) recorded in a specific area of the optical disk is inserted. In Pregroove) information is read (S2).

Thereafter, the optical recording and reproducing apparatus checks write information from the read ADIP information (S3), and performs OPC to select an optical power suitable for recording based on the identified write information (S4).

After performing the OPC, the optical recording and reproducing apparatus analyzes the jitter value and the optical power in two dimensions based on the OPC information to confirm the optical power having the lowest jitter value (S5), and to the optical power having the lowest jitter value. Data is recorded on the optical disc (S6). In this case, when the jitter value and the optical power are analyzed in two dimensions based on the OPC information, if the X axis is the optical power and the Y axis is the jitter value, a graph is drawn in the inverse parabolic form, and the optical power having the lowest jitter value is selected. Used for recording.

However, the optical power setting method of the general optical recording and reproducing apparatus as described above, in the case of new media (ie, untuned media), since the tuning information is not included in the firmware of the optical recording and reproducing apparatus, the performance and optical recording of the optical disc are recorded. Since the error of the performance of the reproducing apparatus is maintained as it is, there is a problem that it is impossible to find and record the optimal optical power. In other words, in the conventional method, since the optical recording / reproducing apparatus performs recording through information read from an optical disc that is not tuned, the data cannot be recorded with the optimal recording performance due to the difference in the performance of each optical recording / reproducing apparatus.

SUMMARY OF THE INVENTION An object of the present invention is to provide an optimal optical power setting method of an optical recording / reproducing apparatus that can improve the recording performance by finding an optimal optical power when recording data on a new, untuned optical disk to solve the above-mentioned problems. There is.

In order to achieve the above object, an optimal optical power setting method of an optical recording / reproducing apparatus according to the present invention reads ADIP information recorded in a specific area of an optical disc inserted into the optical recording / reproducing apparatus, and writes information from the read ADIP information. Confirming; Setting a Ttop3 value (a pulse period at the start of recording at the 3T mark) for performing OPC based on the checked write information; Performing an OPC for selecting an optical power suitable for recording according to the set Ttop3 value, and analyzing the jitter value and the optical power in two dimensions based on the OPC information; Re-performing the OPC by giving a deviation to the set Ttop3 value until the set number of times is reached, and analyzing the jitter value and the optical power in two dimensions based on the OPC information; If the OPC is performed a predetermined number of times, comparing the jitter value and the optical power analyzed in two dimensions to identify the optical power having the lowest jitter value; And recording the data on the optical disc at the optical power having the lowest jitter value.

In this case, the above-described optical disk is an untuned optical disk, and OPC is preferably performed three or more times.

Hereinafter, an optimal optical power setting method of the optical recording and reproducing apparatus of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram illustrating an optical recording and reproducing apparatus for explaining a control process for setting an optimum optical power according to the present invention.

As shown, the optical pickup section 10 records predetermined data on the optical disk at the optimal optical power set by the method of the present invention under the control of the laser diode driver 30, and outputs the optical signal reflected from the optical disk. The signal is output to the RF signal amplifier 50. At this time, the optical disc is new media that is not tuned.

The recording pulse generator 20 generates an actual recording pulse including the auxiliary information from the microcomputer 40 in the recording information transmitted from the host (not shown) and outputs the actual recording pulse to the laser diode driver 30.

The laser diode driver 30 drives the laser diode included in the optical pickup unit 10 according to the recording pulse generated by the recording pulse generator 20 and the laser power step set by the microcomputer 40.

The microcomputer 40 controls the overall driving related to recording and reproducing of the optical recording / reproducing apparatus, and based on the light information read from the new untuned optical disk, the Ttop3 value (3T mark including most data) for performing OPC. After setting the pulse period at the start of recording in the control, to control to perform OPC according to the set Ttop3 value, and then control to perform OPC by changing the value of Ttop3 (that is, + △ Ttop3,-△ Ttop3), By comparing the OPC results performed three or more times, the optical power having the lowest jitter value is selected and the control is performed to perform recording with the optical power.

In this case, the reason why the TT3 value of the 3T mark is used when performing OPC is because the 3T mark includes most of the data from 3T to 14T, and thus has the greatest influence on the jitter value. The Ttop3, + △ Ttop3, and-△ Ttop3 values The reason for performing OPC by changing to is to find an optical power having an optimal recording performance since the optimum optical power varies depending on the characteristics of the optical recording and reproducing apparatus.

In addition, since the write information of the optical disk is given as a hex value, after the Ttop3 value is set, the OPC is performed with the front and rear of the value as ± ΔTtop3.

The RF signal amplifier 50 amplifies the RF signal detected by the optical pickup unit 10 and outputs the signal to the signal processor 60.

The signal processor 60 reproduces the RF signal amplified by the RF signal amplifier 50 under the control of the microcomputer 40.

Next, an embodiment of an optimal optical power setting method of the optical recording and reproducing apparatus according to the present invention configured as described above will be described in detail with reference to FIG.

3 is a flowchart showing in detail the operation of the method for setting the optimum optical power of the optical recording and reproducing apparatus according to the present invention.

First, in the optical recording / reproducing apparatus, it is judged whether or not the optical disk is inserted in accordance with a user's operation for recording predetermined data (S10). In this case, the optical disc insertion determination step is a step of determining whether a new optical disc that is not tuned is inserted.

As a result of the determination, when a new untuned optical disc is inserted, the optical recording / reproducing apparatus reads ADIP information recorded in a specific area of the optical disc (S20), and checks the write information from the read ADIP information (S30).

Thereafter, the optical recording and reproducing apparatus sets a Ttop3 value for performing OPC based on the identified write information (S40), and performs an OPC for selecting an optical power suitable for recording according to the set Ttop3 value (S50).

After performing the OPC, the optical recording and reproducing apparatus analyzes the jitter value and the optical power in two dimensions based on the OPC information performed according to the Ttop3 value (S60).

Thereafter, the optical recording and reproducing apparatus determines whether the number of times of performing the OPC has been reached (for example, three times) (S70). OPC is repeated to give + ΔTtop3 or −ΔTtop3, and the jitter value and optical power are analyzed in two dimensions based on the OPC information (S80). That is, in the optical recording and reproducing apparatus, the OPC is repeatedly performed three times in the order of the Ttop3, + ΔTtop3, and -ΔTtop3 values, or in the order of the Ttop3, -ΔTtop3, and + ΔTtop3 values.

At this time, the number of times for performing the OPC is preferably set to three times, such as Ttop3 value set in step S40, Ttop3 value (± △ Ttop3) before and after the set Ttop3 value, but is not limited thereto. It can also be set 5 times or more, such as ± △ Ttop3 and ± 2 △ Ttop3.

Now, when OPC is performed a predetermined number of times, the optical recording / reproducing apparatus compares the two-dimensionally analyzed jitter value with the optical power based on the OPC result performed with each setting value of Ttop3 and ± △ Ttop3, and thus the lowest jitter value. The optical power having the optical power is selected (S90), and data is recorded on the optical disk at the selected optical power (S100).

Herein, while the present invention has been described with reference to the preferred embodiments, those skilled in the art will variously modify the present invention without departing from the spirit and scope of the invention as set forth in the claims below. And can be changed.

As described above, according to the optimal optical power setting method of the optical recording and reproducing apparatus of the present invention, the lowest jitter value is obtained based on the result of performing OPC by changing the Ttop3 value of the 3T mark including most of the data three or more times. By selecting and performing the recording at the optical power at this time, there is an effect that the recording performance can be greatly increased when recording data on the new untuned media.

Claims (3)

Reading ADIP information recorded in a specific area of the optical disc inserted in the optical recording and reproducing apparatus, and checking the write information from the read ADIP information; Setting a Ttop3 value (a pulse period at the start of recording at the 3T mark) for performing OPC based on the identified write information; Performing OPC for selecting an optical power suitable for recording according to the set Ttop3 value, and analyzing the jitter value and the optical power in two dimensions based on the OPC information; Redoing the set Ttop3 value until the set number of times is reached and analyzing the jitter value and the optical power in two dimensions based on the corresponding OPC information; If the OPC is performed a predetermined number of times, comparing the jitter value and the optical power analyzed in two dimensions to identify the optical power having the lowest jitter value; And And recording data on the optical disc at the optical power having the lowest jitter value. The method of claim 1, wherein the optical disk, An optimal optical power setting method for an optical recording and reproducing apparatus, characterized in that the optical disk is not tuned. The method of claim 1, wherein the number of times to perform the OPC, Optimal optical power setting method for an optical recording and reproducing apparatus, characterized in that three or more times.

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