KR20020088144A - Method for detecting the optimal writing power of an optical disc - Google Patents

Abstract

PURPOSE: A method for detecting optimum power control of an optical disk is provided to obtain the optimum power control value in advance by using a resting time of the optical disk, thereby stably performing a write operation without problems of delaying the write operation and losing some data. CONSTITUTION: A method for detecting optimum power control of an optical disk includes the steps of confirming whether an operating command is input within a predetermined time after completing loading of the optical disk(S10), performing an OPC(Optimum Power Control) operation by each recording speed until the operating command is input if the operating command is not input within the predetermined time to detect the optimum power control value of each recording speed(S11), storing the detected optimum power control value at a memory with connecting detected optimum power control value with the corresponding speed(S12).

Description

Method for detecting the optimal writing power of an optical disc

The present invention relates to a method of performing OPC for each recording double speed by using the sleep time of an optical disc device, and performing a recording operation using the optimum recording optical power obtained therefrom.

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 detected using the recorded target recording optical power value, and then the recording operation is performed using the target recording optical power value. The optimal recording optical power detection process (OPC: Optimum Power Control) is shown in the flowchart of FIG. Briefly described with reference to the following.

First, when a recordable optical disc is loaded after the operating power is applied to the device (S1), an optimal recording power detection (OPC) operation is performed, wherein the recording speed of the device is a basic speed (for example, 4 times the test data of 15 ATIP in the test area of the recordable optical disc while changing the optical power value by a predetermined size (ΔP) based on the target recording optical power value recorded on the recordable optical disc which is rotated and driven. Will be recorded.

When the recording of the test data is completed, the recorded test data of 15ATIP is sequentially read and the optimal recording optical power value is detected from the reproduction characteristic thereof (S2).

In this state, when the optimal recording optical power value for the basic speed (4 times speed) is detected, when a recording request is made (S3), it is checked whether the recording is performed at the basic speed (4 times speed) (S4). In case of recording, the recording operation is performed using the optimally detected optimal recording optical power value (S6, S7).

However, in the conventional method for detecting the optimal recording optical power of the conventional optical disc apparatus as described above, only the optimal recording optical power value for the basic recording speed (4 times speed) of the apparatus is detected before the recording operation is performed after the optical disc is loaded. If the requested data recording operation is recording at 1x speed, that is, if it is a recording request for an analog input signal, set the device's double speed to 1x speed and then perform OPC operation for optimal recording at 1x speed. The optical power value is detected (S5), and the 1x speed recording operation is performed using the same, and while the OPC operation is being performed, the analog signal is already input from the outside, but only after the completion of the OPC operation. Since the recording operation is performed on the analog input signal, the input signal during the time (about 10 seconds) required to perform one OPC operation is There was a problem of not being recorded on a recordable optical disc.

Accordingly, the present invention was created to solve the above problems, and by using the dormant time during which recording operation is not performed, the optimum recording optical power value at each recording speed is obtained in advance, so as to detect in advance the recording request. It is an object of the present invention to provide an optimal recording optical power detection method of an optical disc in which a recording operation is performed immediately by using the optimal recording optical power value.

Figure 1 shows the flow of one embodiment of a conventional optimal recording optical power detection method,

FIG. 2 is a block diagram showing the configuration of an optical disk driver for implementing an optimal recording optical power detection method for an optical disk according to the present invention.

FIG. 3 shows a schematic diagram of an OPC operation performed in the optical disk recording apparatus of FIG.

4A to 4C show a flow of a preferred embodiment of the method for detecting an optimal recording optical power of an optical disc according to the present invention.

Fig. 5 shows the data format of the target recording optical power value recorded on the recordable optical disc,

Fig. 6 shows the data range of the β range value and the optimal write strategy recorded on the optical disc,

FIG. 7 shows an example of the form of changing the optical power on the basis of the target recording optical power value when recording test data;

Fig. 8 shows a recording signal test area A of the optical disc and a count area B for recording the test number,

Fig. 9 shows an example of a reproduction signal for data recorded test on an optical disc,

Fig. 10 shows the? Curve form for detecting the optimal recording optical power value for a write once optical disc (CD-R),

Fig. 11 shows an example of the storage mode of the optimal recording optical power value for each recording double speed obtained by performing the optimal recording optical power detection method of the optical disc according to the present invention.

※ Explanation of symbols for main parts 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 section

60: servo unit 70: drive unit

80: micom 81: memory

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 confirming whether an operation command is input within a predetermined time after loading of the optical disc is completed; A second step of detecting an optimal recording optical power value for each recording speed by performing an OPC operation for each recording speed until the operation command is input when there is no operation command within the predetermined time; And a third step of storing the detected optimal recording optical power value in a memory in association with the corresponding double speed, respectively.

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 showing the configuration of an optical disk driver for implementing an optimal recording optical power detection method for an optical disk according to the present invention, wherein an error correction code (ECC) or the like is added to the digital data to be converted into a recording format. A digital recording signal processor 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 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 filtering the signal detected by the optical pickup 20 to output 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 (T.E) and focus error (F.E) 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; A memory 81 in which an optimal recording optical power value for each recording speed is stored; And a microcomputer 80 for controlling the OPC operation and data recording / reproducing process for the optical disc 10.

FIG. 3 shows a schematic diagram of an OPC operation performed in the optical disk device of FIG.

4A to 4C show the flow of a preferred embodiment of the method for detecting an optimal recording optical power of an optical disc according to the present invention. Hereinafter, FIGS. 4A to 4 according to the present invention will be described with reference to the configuration of FIG. 2 and the diagram of FIG. The optimal recording optical power detection method of Fig. 4C will be described in detail.

First, when the recordable optical disc 10 is loaded after the operation power is applied to the device (S10), the microcomputer 80 performs an OPM (Optimum Power Control) operation. The microcomputer 80 sets a basic speed (for example, 4 times speed) of the recording speed of the apparatus, and drives the spindle motor 11 through the servo unit 70 and the drive unit 70 to drive the optical disc ( 10) will be rotated. Subsequently, the microcomputer 80 confirms the target recording optical power value _Pind which is recorded as data of 3 bits W1, W2, W3 on the optical disc 10 as shown in FIG. The type of signal is determined based on a write strategy recorded on the optical disc 10, that is, a recording pulse, which is recorded at a fixed value at the time of manufacture of a recording medium. In the case of a recordable optical disc (CD-R), its value is fixed for each type of recording medium as shown in FIG.

The microcomputer 80 variably applies the control signal for changing the identified target recording optical power value (for example, 8 mW) by a predetermined size ΔP as shown in FIG. Accordingly, the optical driver 41 outputs a recording signal for test data with optical driving power corresponding to the applied control signal, so that the optical pickup 20 has a test area A shown in FIG. The test data of 15 ATIP (= 15 sector = 15 block) is recorded on the microcomputer 80, and the microcomputer 80 causes the optical pickup 20 to determine a signal level or duration of a recording pulse. Based on the recording method, test data should be recorded while maintaining a fixed value.

As described above, when the test data of 15 ATIP is completed in the test area A of the optical disc 10 due to the fixed driving pulse and the optical drive power varying to a predetermined size, the microcomputer 80 may close the optical pickup 20. The test data recorded by the control is sequentially read, and the asymmetry value of the reproduction signal is read from the reproduction signal for the test data as shown in FIG. 9 read out as described above and filtered by the R / F unit 50. ([beta] = [(A1-A2) / (A1 + A2)] x 100 and slice level = 0) is calculated. Subsequently, the microcomputer 80 fits the function of the curve as shown in FIG. 10 by the respective optical power values at which the calculated β value is obtained, and then the microcomputer 80 is a target recorded on the optical disc 10. By reading the β range value, the optimum recording optical power value is detected from the obtained curve and the read target β range value as shown in FIG. 10 (S11). The target β range value is shown in FIG. As described above, it is recorded as data of 3 bits (P1, P2, P3) in the 'Second' byte (when M1: S1: F1 = 001) in ATIP, which is a time information field recorded on the optical disc 10. 80) indicates that the range of β is -4 to + 8% when the read 3-bit data P1, P2, P3 is '000', and the range of β is 0 when '001' is read. It confirms that it is-+12%.

When the optimal recording optical power value for the basic speed is detected by performing the OPC operation as described above, the microcomputer 80 controls the optical pickup 20 to perform one OPC operation in the count area B shown in FIG. In other words, null data is recorded over 1ATIP of the count area B so that the microcomputer 80 may later record from the null data recording section of the count area B. You can see how many OPC operations have been performed.

The microcomputer 80 associates the detected optimal recording optical power value with the corresponding recording speed of 1x and stores it in the memory 81 as shown in FIG. 11 (S12), and then operates as a recording request within a predetermined time. When the command, that is, the Record Key is input (S20), confirms the recording speed, and in the case of the recording request at the basic speed (S21), the requested recording operation is performed using the optimal recording and optical power value stored and detected. If the speed is not the default recording speed, the optimum recording optical power value is detected by resetting the recording speed of the apparatus and performing an OPC operation on the reset recording speed (S22).

When the optimum recording optical power value for the reset recording speed is detected, the microcomputer 80 stores the detected recording optical power value in association with the corresponding recording speed in the memory 81 (S23). The requested recording operation is performed using the detected recording optical power value (S24), and such a recording operation is continuously performed until the recording is completed (S25).

If there is no operation command such as a recording request within a predetermined time, the microcomputer 80 switches the state of the device to a standby state, that is, a sleep state to maintain a sleep state (S30).

The microcomputer 80 checks whether the duration of the dormant state of the device has passed a predetermined time, and when the dormant time of the device continues for a predetermined time (S40) by using the dormant time for each recording speed (for example, , 1x, 2x, ...) OPC operation is performed to detect the optimal recording optical power value, OPC operation in the order of 1x, 2x, ....

Accordingly, the microcomputer 80 sets the recording speed of the apparatus to 1x speed, and performs the OPC operation as described above to detect the optimal recording optical power value for 1x speed (S41). The power value is stored in the memory 81 in association with the corresponding 1x speed (S42).

The microcomputer 80 sequentially performs the OPC operation with respect to the next recording double speed, 2x, ..., and the memory 81 in association with the corresponding double speed with the recording optical power value detected according to the OPC operation. Will be stored in.

However, if the Record Key is input to the microcomputer 80 during the OPC operation for each recording speed, the microcomputer 80 performs the OPC operation normally so that the optimum recording optical power value is detected and stored (e.g., , 1x), and when the recording operation according to the above recording request is completed and the device is in the dormant state again, each of the above-described recording speeds from the next recording speed (e.g., 2x speed) of the checked recording speed A process of storing the detected optical power value according to each OPC operation and OPC operation is performed.

Accordingly, when the optimal recording optical power value for each recording speed is detected and stored, when the Record Key is input to the microcomputer 80 (S50), the microcomputer 80 performs a recording operation. .

First, the microcomputer 80 sets the recording speed of the apparatus, and drives the optical disc 10 through the servo unit 60 and the drive unit 70. 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 for recording on the optical disc 10 and applies it to the optical driver 41. The microcomputer 80 checks the optimal recording optical power value for the set recording speed from the memory 81 and performs a recording operation using the confirmed recording optical power value (S51). The optical driver 41 is controlled to output a recording signal by an optical driving current corresponding to the recorded optical power value, and the optical driver 41 outputs a signal by the optical driving power according to the optical pickup 20. The pulse width modulated signal is applied to the program area of the optical disc 10 so that the recording operation is continued until the data is written (S60).

In the above embodiment, if the door of the optical disk device is opened, the microcomputer 80 deletes all the contents of the memory 81, and the optimum recording optical power value for each recording speed stored in the memory 81 Since the value is meaningless for other optical disks, a new optical disk can be inserted and seated when the door of the optical disk apparatus is opened.

Further, in the above embodiment, even when all of the optimum recording optical power values for the respective recording speeds are stored, the microcomputer 80 frequently selects the optimum recording optical power values for the respective recording speeds when the optical disk device is in the dormant state. By detecting and updating the stored contents of the memory 81, the recording characteristics of the optical disc 10 are continuously changed in the state where the power is applied to the apparatus, and thus the optimal recording optical power value detected It also depends on the characteristics of the recording medium.

In the above-described embodiment, that is, if there is no operation command such as a recording request within a predetermined time after the recordable optical disc 10 is loaded, the state of the device is switched to the dormant state to detect and store the optimal recording optical power for each recording speed. Unlike the example described above, if the microcomputer 80 receives the optimal optical power detection command for each recording speed after the recordable optical disc 10 is loaded, the recording speed according to each recording speed as described above is then applied. Embodiments of detecting and storing the optimal recording optical power, respectively, can of course also be implemented.

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 scope of the present invention disclosed in the appended claims. Replacement or addition may be possible.

The optimal recording optical power detection method for an optical disc according to the present invention as described above detects and stores the optimal recording optical power value for each recording speed in advance by using the sleep time of the optical disc apparatus, and thus the optimal recording optical power value detected and stored as described above. By immediately performing the requested recording operation by using, it is a very useful and convenient invention that the recording operation is made stable without problems such as delayed recording or partial data not being recorded.

Claims (3)

In the optimal recording optical power detection (OPC) method of the optical disk device, A first step of checking whether an operation command is input within a predetermined time after the loading of the optical disc is completed; A second step of detecting an optimal recording optical power value for each recording speed by performing an OPC operation for each recording speed until the operation command is input when there is no operation command within the predetermined time; And And a third step of storing the detected optimal recording optical power value in a memory in association with the corresponding double speed, respectively. The method of claim 1, Repeating the second step at predetermined time intervals to detect an optimum recording optical power value for each recording double speed, and updating the storage contents of the memory based on the detected optimal recording optical power value. Optimal recording optical power detection method. In the optimal recording optical power detection (OPC) method of the optical disk device, A first step of performing an OPC operation for each double speed when an optimum optical power detection command for each double speed is input in a state where the optical disc is inserted and mounted; A second step of storing each optimal recording optical power value detected according to the OPC operation in a memory in association with a corresponding double speed; And And a third step of performing a recording operation by checking the optimum recording optical power value for the corresponding double speed at the recording request, from the memory.