KR100713361B1 - Optimal Recording Optical Power Detection Method for Optical Discs - Google Patents

Abstract

The present invention relates to a method of securing an additional OPC area in addition to a test area designated as an OPC area on an optical disc, and thereby performing a recording operation. The method relates to whether an OPC operation is possible in a test area of an inserted optical disc when a recording request is made. Determining a first step; If it is determined that the OPC can no longer be performed in the test area, a second step of moving to a designated OPC area and performing an OPC operation; And a third step of performing the requested recording operation by using the optimum recording optical power value detected in accordance with the OPC operation, without the recording operation being no longer performed due to the lack of the OPC area. It is a useful invention that can stably perform a recording operation.

OPC, optical disc, test area, lead-out area, count area

Description

Method for detecting the optimal writing power of an optical disc             

Fig. 1 shows a recording signal test area A and a count area B for recording the test frequency of an optical disc,

FIG. 2 shows the configuration of an embodiment of an optical disk drive apparatus in which an optimal recording optical power detection method for an optical disk according to the present invention is implemented.

3A and 3B show a flow of a preferred embodiment of the method for detecting optimal recording optical power of an optical disc according to the present invention;

Fig. 4 shows the data format of the target recording optical power value recorded on the recordable optical disc (CD-R disc);

Fig. 5 shows the? Curve form for detecting the optimal recording optical power value for a recordable optical disc (CD-R disc).

※ Explanation of code for main part of drawing

10 optical disc 11: spindle motor

20: optical pickup 30a: digital recording signal processing unit                 

30b: digital reproduction signal processor 40: channel bit encoder

41: optical driver 50: R / F part

60: servo unit 70: drive unit

80: micom

The present invention relates to a method for securing an additional OPC area in addition to a test area designated as an OPC area on an optical disc so that a recording operation can be performed without a shortage of the OPC area.

In general, recording optical power varies depending on the state or type of the recording medium, the state of the recording device (laser quality, write strategy, laser type and temperature characteristics, etc.), the recording speed, and so on. The optimal recording optical power value is obtained by using the recorded target recording optical power value, and then the recording operation is performed by using the optimal recording optical power value. The optimal recording power detection process (OPC: Optimum Power Control) is briefly described as follows. .

As shown in FIG. 1, a test area A and a count area B exist in the PCA area of the optical disc 10, and the test area A can record test data of about 1500 ATIP (= 1500 Block). Since the test data of about 15 ATIP is recorded in one OPC operation, the test area A can perform a total of 100 OPC operations.

In this state, when the recording request is made to the optical disc 10, test data of a predetermined number of times, i.e., 15 ATIP (= 15 blocks) is recorded in the test area A, and the optimum recording optical power value is detected from the reproduction characteristics thereof. After such one OPC operation is completed, null data of 1ATIP (= 1 Block) is recorded in the count area B. In this way, the count area B is completed every one OPC operation. By recording null data of 1 ATIP in the data, it is possible to know how many times the OPC operation has been performed.

Subsequently, the requested recording operation is performed using the optimum recording optical power value detected by the OPC operation.

However, in the conventional data recording method as described above, the OPC operation can be performed up to 100 times in the test area designated as the OPC area on the optical disc. If it cannot be performed, there is a problem that the data recording operation can no longer be performed due to the lack of the OPC area.

Accordingly, the present invention was created to solve the above problems, and in addition to the test area designated as the OPC area on the optical disc, the unused area of the lead-out area of the optical disc is secured as the OPC area, so that the recording operation can be performed without a shortage of the OPC area. It is an object of the present invention to provide a method for detecting an optimal recording optical power of an optical disc to be achieved.

According to an aspect of the present invention, there is provided a method of detecting an optimal recording optical power of an optical disc, comprising: a first step of determining whether an OPC operation is possible in a test area of an inserted optical disc when a recording request is made; If it is determined that the OPC can no longer be performed in the test area, a second step of moving to a designated OPC area and performing an OPC operation; And a third step of performing the requested recording operation using the optimum recording optical power value detected in accordance with the OPC operation.

EMBODIMENT OF THE INVENTION Hereinafter, preferred embodiment of the optimal recording optical power detection method of the optical disc which concerns on this invention is described in detail based on attached drawing.

FIG. 2 is a block diagram of an embodiment of an optical disk driver in which an optimal recording optical power detection method for an optical disk according to the present invention is implemented. A digital recording signal processing unit 30a for converting to a format; 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 an 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 outputting it as a binary signal; A drive unit 70 for driving the optical pickup 20 and the spindle motor 11 for rotationally driving the optical disc 10; A servo unit 60 for controlling the driving of the drive unit 70 from the tracking error (TE) and focus error (FE) signals 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 clock synchronized with the binary signal; And a microcomputer 80 for controlling the OPC operation and data recording / reproducing process for the optical disc 10.

3 is a flow chart showing the flow of a preferred embodiment of the method for detecting optimal recording optical power of an optical disc according to the present invention. Hereinafter, the detection method of FIG. 3 according to the present invention will be described in detail with reference to the configuration of FIG. .

First, in response to a data recording request (S10), the microcomputer 80 checks the count area B in the PCA area of the optical disc 10 and checks whether the OPC operation is possible in the test area A of the optical disc 10. (S11) Since null data of 1ATIP is recorded every time the OPC is performed in the count area B, the OPC operation is performed in the test area A from the null data recorded in the count area B. It is easy to see how many times this total was made.

As a result of the check, when the OPC operation can be performed in the test area A (S20), that is, when the total number of OPC operations is less than 100 times in the test area A, the microcomputer 80 performs the test. The OPC operation is performed on the area A, which will be described in detail below.

The microcomputer 80 confirms a target recording optical power value (P _ind ) recorded as three bits (W1, W2, W3) of data on the optical disk 10 that is rotated, and further records a recording signal. Is determined based on a write strategy recorded on the optical disc 10, that is, a recording pulse. The recording method is recorded at a fixed value at the time of manufacture of a recording medium, and is recorded once. In the case of a possible optical disc (CD-R), the value is fixed for each type of recording medium as shown in FIG. 4, and in the case of a rewritable optical disc (CD-RW) for each recording speed of the recording medium. have.

When the target recording optical power value and the recording method are confirmed for the optical disc 10 as described above, the microcomputer 80 assigns an optical power value based on the identified target recording optical power (for example, 8 mW). A control signal for varying the size by the step size ΔP is variably applied to the optical driver 41. Accordingly, the optical driver 41 is an optical driving power corresponding to the applied control signal. The optical pickup 20 records the test data in the test area A of the optical disc 10 by outputting a recording signal for the optical disc 10. In this case, the microcomputer 80 detects that the optical pickup 20 The test data is recorded while maintaining the signal level or duration based on the confirmed recording method.

As described above, while the test data is recorded in the test area of the optical disc 10 by the optical driving power varying to a predetermined size and a fixed recording pulse, the microcomputer 80 controls the optical pickup 20 to control the optical pickup 20. The recorded test data is read out sequentially. In this case, when the optical disc 10 is an optical disc (CD-R disc) that can be written once, the microcomputer 80 is read out sequentially and the R / F unit ( 50, an asymmetry value β of a reproduction signal with respect to the test data to be filtered is calculated.

 Subsequently, the microcomputer 80 fits the function of the curve as shown in FIG. 5 based on the respective optical power values obtained from the calculated β value, and then checks the target β range value from the optical disc 10. The optimal recording optical power value is detected from the curve obtained as described above and the identified target β range value (S21), wherein the target β range value is recorded on the optical disc 10 as shown in FIG. In the 'Second' byte (when M1: S1: F1 = 001) in the field ATIP, three bits (P1, P2, P3) are recorded, so that the microcomputer 80 reads the read three bits (P1, P2). When the data of P3) is '000', the range of β is -4 to + 8%, and when it is '001', the range of β is 0 to + 12%.

When the optimal recording optical power value is detected as described above, the microcomputer 80 controls the optical pickup 20 to record null data of 1 ATIP in the count area B, thereby performing the number of OPC operations. In this case, the requested recording operation is performed using the optimal recording optical power value (S22), which is as follows.

The digital recording signal processor 30a generates an error correction code (ECC Block) by adding an encoding and an error correction parity for reliability of recording / reproducing the input coded data, and the channel bit encoder. 40 converts the digital bitstream output from the digital recording signal processing unit 30a into a pulse width modulated signal form for recording on the optical disc 10 and applies the signal to the optical driver 41. 80 controls the optical driver 41 to output a recording signal by an optical driving current corresponding to the optimal recording optical power value, and the optical driver 50 outputs a signal by the optical driving power according to the optical driving power. The pulse width modulated signal is applied to the pickup 20 to be recorded in the program area of the optical disc 10. Such a recording operation is continued until the recording operation is completed (S30). It becomes.

However, if the microcomputer 80 confirms that the OPC operation has already been performed 100 times in the test region A from the count region B, the microcomputer 80 is no longer in the test region A. Since the OPC operation cannot be performed, the optical pickup 20 is moved to the lead-out area of the optical disc 10. The lead-out area is a signal area for indicating the end of the program.

)가 상기 R/F부(50)로 부터 출력되는지를 계속해 서 확인하게 된다. 이와 같은 확인과정 중에 더 이상 상기 R/F부(50)로 부터 이진신호가 출력되지 않는 경우에는 상기 마이컴(80)은 상기 광픽업(20)이 현재위치한 리드아웃 영역의 해당 지점을 데이터가 마지막으로 기록된 위치로 판단하게 된다.When the optical pickup 20 moves to the lead-out area, the microcomputer 80 searches for a position where data is last recorded on the lead-out area (S40). The optical pickup 20 is controlled to read data recorded on the lead-out area, and accordingly, the microcomputer 80 generates a binary signal (

Is continuously output from the R / F unit 50. When the binary signal is no longer output from the R / F unit 50 during the checking process, the microcomputer 80 ends the corresponding point of the lead-out area where the optical pickup 20 is currently located. It is determined by the recorded position.

 The reason why the microcomputer 80 searches for the location where data was last recorded is because test data may already be recorded in the lead-out area according to the previous OPC operation.

Subsequently, the microcomputer 80 performs the OPC operation of the above-described process from the position at which data was last recorded in the lead-out area, and moves the optical pickup 20 back to the data recording position when the OPC operation is completed. Then, the requested recording operation is performed as described above using the optimal recording optical power value detected according to the OPC operation (S41, S42). Such recording operation is performed until the recording operation is completed ( S50) will continue.

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 substitute various other embodiments within the technical spirit and scope of the present invention disclosed in the appended claims below. Or addition may be possible.

In the method of detecting the optimal recording optical power of the optical disc according to the present invention as described above, a part of the lead-out area on the optical disc is additionally secured and used so that the recording operation is no longer performed due to the lack of the OPC area. It is a useful invention that can stably perform a recording operation.

Claims (3)

In the method of performing OPC of an optical disc, A first step of determining whether or not OPC operation is possible in a test area of the inserted optical disc upon recording request; If it is determined that the OPC can no longer be performed in the test area, a second step of moving to a designated OPC area and performing an OPC operation; And And a third step of performing the requested recording operation by using the optimum recording optical power value detected in accordance with the OPC operation. The method of claim 1, And said additionally designated OPC area is a part of a lead-out area of said optical disc. The method of claim 2, The second step may include moving to a lead-out area of the optical disc to search for a position where data was last recorded; And And performing an OPC operation from the searched position.

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