KR20040002366A - Optimal Recording method onto a Recording Medium - Google Patents

Abstract

PURPOSE: A method for optimum recording for an optical disc is provided to keep ROPC in the most optimum way if various recording speed is appliable and keep most recording conditions and recording power if the recording speed is varying, thereby improving the quality in the recorded signal playing. CONSTITUTION: An optimum recording method for an optical disc includes carrying out data reading from a test area of an optical disc while varying recording light with respect to a reference value of checked optimum light and carrying out OPC operation for detecting optimum recording light power value(S11). A microcomputer checks a set recording speed(S12). If the checked recording speed is CLV type, the microcomputer carries out ROPC operation by using a B-level reference value set in the previous OPC operation(S30). If P-CAV type, a position to record input data is determined in a CAV zone or a CLV zone(S20). In the case of CLV zone, the B-level reference value is ignored and a B-level reference value recorded is set in response to a disc code and its corresponding speed(S21), thereby carrying out the ROPC operation by the value(S22). In the other case, recording conditions for 24 speed is read from a memory and set to an optical driver(S13), thereby starting the data recording by the newly set recording condition(S14). A reflection level value detected when a 11T signal is stabilized is set to a new B-level reference value(S15) for carrying out the ROPC operation(S16). During the data recording, the microcomputer checks the change in the speed(S17). According to the change, the recording conditions stored in the memory is read and set to the optical driver(S18). As the newly set recording conditions are used for the recording, the B-level of the 11T signal is read again as a new reference value to carry out the ROPC operation(S14-S16). The B-level reference value is modified per 1/4 speed change until the data recording is finished(S19).

Description

Optimal Recording Method onto an Optical Disk {Optimal Recording Method onto a Recording Medium}

The present invention relates to an optimal recording method of an optical disc in which the optimum recording light of data is maintained in various recording speed schemes for recording data on a disc recording medium.

The disk apparatus for recording data on the disk recording medium detects optimal recording optical power for a test area (PCA: Power Calibration Area) of the recording medium before performing a data recording operation requested from the outside (OPC: Optimal). Power Calibration). When the optimum recording light is obtained by the OPC operation, the user data to be input is then recorded on the disc recording medium using the detected optimum light.

However, as the recording area progresses from the test area of the inner circumference to the outer circumference, the characteristics of the recording area change, so that the same reproduction characteristics cannot be guaranteed by the optimally detected optimal recording light if the recording area is changed.

The main reason for the change in characteristics is due to the change in the thickness of the recording film of the recording medium. The thickness of the recording film becomes thicker toward the outer circumference by the spin coating process in the manufacturing process.

If the thickness of the recording film is different, the degree of absorbing the recording light applied instantaneously varies, and thus the degree of burning of the recording film also varies. In other words, if the thickness is thick, the applied heat is quickly dissipated, and thus the degree of burning is decreased, so that the reflectance by incident light is increased. do.

In order to solve this problem, the disk apparatus detects the reflection level (B level) at the time when the change of the medium is stabilized by the recording light as shown in Fig. 1, and this value is applied to the data area at the time of recording the test area and thereafter. The ROPC (Running Optimal Power Control) operation of continuously adjusting the recording light to be the same at the time of recording is performed.

On the other hand, the disk apparatus recorded data at a speed sufficiently lower than the playback speed in order to allow the change of the medium by the recording light. The recording speed method used at this time is the CLV (Constant Linear Velocity) recording speed method of Fig. 2A which maintains the same recording speed in the entire disc area.

However, as the technology enables faster data recording, as shown in FIG. 2B, recording is performed in a CAV (Constant Angular Velocity) method in which the recording speed increases toward the outer periphery, and the maximum recording speed has been achieved. In this case, a partial CAV (P-CAV: Partial CAV) method of converting and recording CLV was introduced.

In addition, since a higher recording speed is possible, recording can be performed in a CAV method over the entire disc area as shown in FIG. 2C. When the user requests recording at the maximum speed, the recording is performed in full CAV mode as shown in FIG. 2C.

However, if the recording speed is different from the speed at which the reference B-level is obtained during data recording, the ROPC operation will not maintain the optimum recording light.

Accordingly, in response to various recording speed schemes, the disk apparatus must appropriately select the method of performing the ROPC described above, and further, there is a need for an improved operation of the ROPC in the case where the recording speed is variable.

SUMMARY OF THE INVENTION The present invention has been made by the necessity of the above, and an object thereof is to provide a method for achieving an appropriate ROPC for various recording speed methods.

It is still another object of the present invention to provide a ROPC method in which the optimum recording light can still be maintained even when the recording speed of the recording medium is varied.

1 shows an example of a reflected signal detected according to a recording pulse,

2A to 2C show examples of various recording speed methods for recording data on a recording medium;

3 shows the configuration of an embodiment of an optical disk apparatus to which an optimal recording method for an optical disk according to the present invention is applied;

4 shows a flow of a preferred embodiment of an optimal recording method of an optical disc according to the present invention,

5 is a diagram schematically illustrating a point where a B-level reference value is updated for a P-CAV (Partial CAV) recording rate method when selecting and performing a running OPC (ROPC) according to an optimal recording method according to the present invention.

※ 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 drive 50: R / F section

51 level detection unit 60 servo unit

70: drive unit 80: microcomputer

81: memory (ROM)

In order to achieve the above object, an optimal recording method of an optical disc according to the present invention includes checking a recording speed method at a data recording position and updating the reflected light reference value for ROPC during data recording according to the confirmed recording speed method. It's a feature of deciding whether or not to use it.

According to another aspect of the present invention, there is provided an optimal recording method of an optical disc, wherein the recording speed at the recording position is checked, a predetermined recording condition (WS: Write Strategy) corresponding to the confirmed recording speed is read, and then the read recording condition is read. It is characterized by updating the reflected light level reflected during data recording to the reflected light reference value for the ROPC.

Hereinafter, a preferred embodiment of an optimal recording method of an optical disc according to the present invention will be described with reference to the accompanying drawings.

3 shows the configuration of an embodiment of an optical disk apparatus in which an optimal recording method for an optical disk according to the present invention is implemented.

3 includes a digital recording signal processing section 30a for adding an error correction code (ECC) or the like to input digital data to convert it into a recording 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 the input signal; An optical pickup (20) for recording a signal on the recordable 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 and a tracking / focusing error signal; An ATIP decoder 51 for decoding and outputting an Absolute Time In Pregroove (ATIP) frame from a wobble signal of the recordable optical disc 10; A level detector 52 for detecting reflected light of a mark or space; A drive unit (70) for driving a sled motor (11a) for moving the optical pickup (20) and a spindle motor (11b) for rotating the optical disk (10); A servo unit 60 for performing tracking and focusing servo operations on the objective lens of the optical pickup 20 and controlling driving of the drive unit 70 to rotate the optical disc 10 at a constant speed; 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 which controls the components as a whole for data recording / reproducing, and in particular, performs an optimal ROPC operation corresponding to each recording speed method.

4 is a flowchart of a preferred embodiment of an optimal recording method of an optical disc according to the present invention. Hereinafter, the optimal recording method of FIG. 4 will be described in detail with reference to the configuration of FIG.

First, when the recordable optical disc 10 is inserted and mounted in a tray (not shown) of the optical disc apparatus (S10) and rotated, the microcomputer 80 is decoded and output from the ATIP decoder 51. While analyzing the ATIP frame, the first (frame number N) and eleventh (frame number N + 10) of the lead-in area are found, that is, the first and second special information frames. The MSBs M1: S1: F1 of the minute: second: frame byte of this frame have values of '101' and '110', respectively. The first frame contains information on the reference value of the optimal recording light and the disc type, and the eleventh frame represents the start time of the lead-in area.

When the frame is found, the microcomputer 80 reads the values of M2: M3: M4 of the first frame to determine the reference value of the optimal recording light, and reads the entire value for the eleventh frame. At this time, the value of M1: S1: F1 is replaced with '100' for the 11th frame, and the value of three bytes is read. Since the start time of the read-in lead-in area is recorded differently for each manufacturer, the manufacturer of the mounted optical disc 10 is confirmed from this value. The start time of the lead-out area recorded in the 21st (frame number N + 20) frame (third special information frame) may be used as disc (or manufacturer) identification information.

The optimal write condition corresponding to the determined disc code and the current recording speed (for example, 16 times speed) is read from the memory 81 and set in the optical driver 41. The current recording speed may be determined by request from the outside.

The microcomputer 80 controls the optical driver 41 to record data in a test area PCA area of the optical disc 10 while varying the recording light around the determined reference value of the optimal recording light. A read operation is performed, and an OPC operation for detecting an optimal recording optical power value is performed through this process. At this time, the B-level by the recording pulse for 11T is also detected and set as the reference value (S11).

Subsequently, the microcomputer 80 checks the set recording speed method (S12). This recording speed method can be determined by a command from an external host or according to a recording speed specified by a user. For example, if the user specifies the maximum possible speed, the P-CAV, or the entire CAV method is determined, and if a stable low speed recording request is made, the full CLV method can be determined.

If the confirmed recording rate method is the entire CLV, the microcomputer 80 performs the same operation as the conventional ROPC using the B-level reference value set in the OPC process in the subsequent data writing operation (S30). .

If the P-CAV method, the position to record the input data is checked to determine whether the position is a CAV zone or CLV zone (S20). The position information may be obtained from track information recorded in a PMA (Program Memory Area) of the optical disc 10 or may receive an address (time code) of a position to be recorded directly from an external host.

The determination of whether the recording position is the CLV zone or the CAV zone is performed by moving the optical pickup 20 to the corresponding position and then grasping it from the cycle of the ATIP frame or the sync signal cycle of the ATIP frame output from the ATIP decoder 51. . If the speed corresponding to the output period of the ATIP frame is less than the maximum speed set in the P-CAV, for example, 40 times speed, the CAV zone is determined. If the speed corresponds to the maximum speed, the CLV zone is determined.

If it is determined that the CLV zone, the microcomputer 80 ignores the first obtained B-level reference value, and reads the previously recorded disc code and the B-level reference value recorded in correspondence with the corresponding double speed in the memory 81. This is set (S21), and the ROPC operation is performed based on the value at the time of subsequent data recording (S22).

If it is determined that the CAV zone or the entire CAV method is determined in the previous recording speed method determination step (S12), the memory condition 81 indicates a recording condition WS for the recording speed at the corresponding position, for example, 24 times speed. Reads from < RTI ID = 0.0 >) < / RTI > The recording speed at that position may be specified from the outside in the range below the maximum possible speed at that position. At the same time as the start of recording, the microcomputer 80 causes the level detector 52 to detect the reflection level at the time when the 11T signal is stabilized and output the value. At this time, the output value is set as a new B-level reference (S15), and the ROPC operation is performed based on the value (S16).

Then, the microcomputer 80 checks the change of the recording speed while data is being recorded (S17). This change in speed can be seen in a variety of ways. For example, as described above, it may be determined from the period of the ATIP frame output from the ATIP decoder 51, or may be determined from the frame period of the EFM data processed by the digital reproduction signal processor 30b. Further, it may be determined from the period of the FG signal output from the FG sensor attached to the spindle motor 11b and the time code of the ATIP frame.

If the writing speed is changed by 1/4 times speed, for example, when the previous writing speed was 24 times speed, and the speed is now 24.25 times, the microcomputer 80 checks the memory 81 before, Read the stored recording condition (WS) for the corresponding double speed of the disc code and set it to the optical driver 41 (S18), and immediately read the B-level of the 11T signal by using this value (S14) and rewrite it. As a reference value (S15), the ROPC operation is performed (S16). As described above, the process of performing the ROPC operation while changing the B-level reference value at each quarter-fold change is performed until the recording of the requested data is completed (S19).

Meanwhile, instead of using the B-level detected at the point where the speed is changed as a new reference value for the next speed, the B-level reference value continuously detects the B-level during the previous speed, and averages the detected B-level. May be used as a reference for an ROPC at a quarter of the next speed.

If the recording speed method of the disc is the P-CAV method, and the increased speed as described above is the maximum speed, for example, 40 times (S40), the microcomputer 80 is designated B- for the speed. The level reference value and the recording condition WS are read from the memory 81 (S21) and used as reference values for data recording and ROPC (S22).

FIG. 5 schematically shows a manner in which the B-level reference value is updated for the P-CAV recording rate method when selecting and performing the ROPC in the manner described so far. In the case of full CAV, the B-level reference value will be updated continuously until the outermost circumference of the disc.

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.

The optimal recording method of the optical disc according to the present invention as described above performs ROPC in the most appropriate manner when various recording speed methods are applicable, and the most suitable recording conditions (WS) and recording when the recording speed is varied. By maintaining the power, the quality of the signal recorded on the optical disc is improved.

Claims (20)

When recording data on a recordable recording medium, Confirming the recording speed method at the data recording position; And And determining whether or not to use the reflected light reference value for the ROPC during data recording in accordance with the confirmed recording speed method. The method of claim 1, wherein the recording speed method includes a method of maintaining a constant linear velocity with respect to the entire recording medium, a method of maintaining a constant angular velocity with respect to the entire recording medium, and a constant angular velocity inside the recording medium and a constant outside. An optimal recording method for an optical disc, comprising the method of maintaining the linear velocity. The method of claim 1, wherein the recording speed method is determined according to an externally requested recording speed. The method of claim 1, wherein in the step 2, if the identified recording speed method is a constant linear speed method, the reflected light reference value is not updated during data recording, and if the determined angular speed method is used, the reflected light reference value is updated during data recording to perform ROPC. And an optimal recording method for the optical disc. The method of claim 1, wherein in the second step, if the recording speed is a variable recording speed, it is determined that the ROPC will be performed while updating the reflected light reference value during data recording. 6. The method according to claim 5, wherein if the recording speed is varied by more than a predetermined size, data is recorded under a recording condition suitable for the variable speed, the level of reflected light is detected, and then the detected reflected light level is reflected light for the ROPC of variable speed. An optimal recording method of an optical disc, characterized by further comprising three steps of updating and using the reference value. 6. The method as claimed in claim 5, wherein the second step detects the level of the reflected light by the recording signal during recording, and then updates the average value of the detected reflected light level to the reflected light reference value for the ROPC of the double speed in which the recording speed is varied by a predetermined size or more. An optimal recording method for an optical disc, characterized in that it further comprises three steps. 8. An optimal recording method of an optical disc according to claim 6 or 7, wherein said predetermined size is 1/4 times speed. The method as claimed in claim 5, wherein the third step determines whether the recording speed is variable or not based on a period of a synchronization signal of an EFM frame, a period of an ATIP frame, or a period of an FG signal, and a time code of an ATIP frame. Optimal recording method for optical discs. The method of claim 1, further comprising: performing a ROPC using a preset reflected light reference value corresponding to the recording speed at the data recording position. 11. The method of claim 10, wherein the reflected light reference value is set for each manufacturer of the recording medium. A first step of checking a recording speed scheme according to the recording speed selected by the user; And And determining whether or not to use the reflected light reference value for the ROPC during data recording in accordance with the confirmed recording speed method. The method of claim 12, wherein the recording speed method is a method of maintaining a constant linear velocity with respect to the entire recording medium, a method of maintaining a constant angular velocity with respect to the entire recording medium, and a constant angular velocity inside the recording medium and a constant line outside. An optimal method for recording an optical disc, comprising the method of maintaining the speed. 1 step of confirming the recording speed at the recording position; Reading out a preset recording condition (WS) corresponding to the checked recording speed; And And updating the reflected light level reflected during the recording of the data using the read recording condition to the reflected light reference value for the ROPC. 15. The method of claim 14, further comprising four steps of performing a ROPC based on the updated reflected light reference value. 15. The method of claim 14, wherein the recording speed is varied according to the recording position of the recording medium. 15. The method of claim 14, wherein the reading of the recording condition WS in two steps and the updating of the reflected light reference value in the three steps are performed whenever the recording speed is changed by a predetermined size or more. 15. The optical disc of claim 14, wherein the first step confirms the recording speed based on a period of a synchronization signal of an EFM frame, a period of an ATIP frame, or a period of an FG signal, and a time code of an ATIP frame. Optimal recording method. 15. The method of claim 14, further comprising four steps of recording data at the same speed from the point to the outermost circumference of the recording medium when the recording speed reaches a predetermined speed. 15. The method of claim 14, further comprising four steps of recording data while increasing the recording speed to the outermost circumference of the recording medium.