KR100932646B1 - Method for determining optimal power control area and optical recording / reproducing device - Google Patents

Abstract

Disclosed is a method of determining an optimal power control performing area in an optical recording medium according to an embodiment of the present invention. The method of determining an optimized optimal power control region according to an embodiment of the present invention includes identifying an optimal power control counter region, moving to a target region to perform optimal power control, and waiting, and performing an optimal power control test region. Obtaining a noise level of error signals generated upon data detection, and determining whether to perform optimal power control in the target area according to the noise level of the error signals.

Description

Method for determination of optimum power control performing area and optical recording / reproducing apparatus according to the present invention.

The present invention relates to a method for determining an optimum power control performing region and an optical recording / reproducing apparatus according thereto, and in particular, by determining a stable region after performing defect detection and performing optimal power control in the region, an optimized optimal power control performing region can be determined. And an optical recording / reproducing apparatus.

In general, optical recording media are classified into compact disks (780 nm), digital versatile disks (DVD) 650 nm, and next-generation optical disks 405 nm or the like, depending on the wavelength of the laser used. Read-only ROM (ROM), write once read memory (WORM) that can be written once, and rewritable digital versatile that can be repeatedly written, depending on whether repeatable recording is possible. disk).

In such an optical recording medium, an optimum power control process is required to obtain excellent recording quality. Here, the optimum power control means that the data is recorded on the optical recording medium, so that the recording can be performed at an optimal power for a recording device or disc having different optical characteristics.

In the case where the optical recording medium is poorly produced or there is an error in the recording operation, noise of a signal may be generated during optimal power control. In addition, the problems of optical recording media are increasing due to the emergence of various optical recording media and inexpensive manufacturing cost. In particular, in the case of next-generation optical discs using light having a short wavelength, an optical recording medium is also required to be manufactured more precisely. In the case of such a next-generation optical disc, there is a problem that it is difficult to easily solve the defect of the optical recording medium, and it is difficult to determine to determine the optimum recording power by preventing stable optimal power control performance.

Incorrectly determining the optimal recording power may cause abnormal control in the recording process, which causes a poor recording of the disc. Therefore, optimal power control, which is a process of determining the optimal recording power, will be very important.

An object of the present invention is to provide a method of determining an optimal power control region.

Another object of the present invention is to provide an optical recording / reproducing apparatus capable of determining an optimal power control performing region.

The method of determining an optimal power control region according to an embodiment of the present invention includes identifying an optimal power control counter region, moving to and waiting for a target region to perform optimal power control, and detecting data in the optimal power control test region. Obtaining a noise level of the error signals generated at the time, and determining whether to perform optimal power control in the target area according to the noise level of the error signals.

Preferably, the step of determining whether to perform the optimum power control is made by determining whether the noise level is smaller than the initial set value.

Preferably, the step of obtaining the noise level of the error signals is characterized by detecting the signal level of the tracking error signal or the focus error signal and converting it to analog to digital to obtain the noise level.

Preferably, the step of determining whether to perform the optimum power control further comprises the step of performing the optimum power control in the target area, if the noise level is less than the initial set value.

Preferably, the step of determining whether to perform the optimum power control, if the noise level is not less than the initial setting, increasing the optimum power control counter by one, making the area according to the target area to perform the optimum power control, and noise of the error signals And returning to the level obtaining step.

An optical recording / reproducing apparatus according to another embodiment of the present invention includes an optical pickup unit, a driver, a radio frequency amplifier, a servo, and a controller.

The optical pickup unit performs a recording or reading operation on the optical recording medium.

The driver drives the optical pickup unit.

The radio frequency amplifier reads and outputs the detected signal through the optical pickup unit.

The servo generates error signals such as a tracking error signal and a focus error signal using the radio frequency amplifier output signal, and controls the driving of the driver accordingly.

The control unit controls the overall recording or reproducing process of the optical recording and reproducing apparatus.

The control unit checks an optimum power control counter area of the optical recording medium, determines a target area for performing optimal power control, obtains noise levels of error signals, and determines whether to perform the optimum power control on the target area according to the noise level. To control the movement of the optical pickup unit.

The method of determining the optimal power control region according to an embodiment of the present invention is more stable by determining whether the optimal power control can be performed by detecting a signal in the optimal power control test region before performing the optimal power control. The optimum recording power and performance area can be determined accurately.

According to another embodiment of the present invention, an optical recording / reproducing apparatus capable of determining an optimal power control performing region may include an optimum power by detecting a signal in an optimal power control test region before performing an optimum power control in a controller provided therein. By determining whether control can be performed, it is possible to determine the optimum recording power and the performance area more stably and accurately.

DETAILED DESCRIPTION In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings which illustrate preferred embodiments of the present invention and the contents described in the drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements.

1 is a view showing a general optical recording medium.

The general optical recording medium 100 has a data storage space formed spirally. 2A to 2C below describe the structure of cross sections in which the optical recording medium 100 is cut in a straight line <A>.

2A is a diagram showing a data area structure of a CD-R / RW disc.

In the data area structure 210 of a CD-R / RW disc, a power calibration area 201, a programmable memory area 203, and a lead-in zone 204, a data zone 207, and a lead-out zone 209 are sequentially arranged in the direction from the inner circumferential region to the outer circumferential region.

The power calibration area 201 is an area containing various information necessary for data recording and reading, and includes an optimum power control counter and an optimum power control test area (not shown). The optimum power control counter has information about where data has been written in the data zone 207. The optimum power control test area is a test area corresponding to the optimum power control counter, and is an area where a test necessary for performing optimal power control is performed.

The programmable memory area 203 is a part having information on the recording of the power calibration area 201. The lead-in zone 205 is an area including a start address, information (time or data), etc., in which a write or read operation is performed, and has information for reproducing data. The data zone 207 is an area in which data actually reproduced is stored. In the data zone 207, data sequentially input from the track of the inner circumference area to the track of the outer circumference area is stored. The lead out zone 209 includes information indicating the end of recording.

2B is a diagram showing a data area structure of a DVD + R / RW disc.

Referring to FIG. 2B, the data area structure 220 of the DVD + R / RW disc is similar to the data area structure of FIG. 2A. The inner drive area 211 has the same role and configuration as the power calibration area and the programmable memory areas 201 and 203 of FIG. 2A, and the lead-in zone 213 is the lead-in zone 205. And the data zone 215 correspond to the data zone 207, respectively. The lead out zone and the outer drive area 217 and 219 correspond to the lead out zone 209.

2C is a diagram illustrating a data area structure of a removable blue ray disc (BD-RE).

Referring to FIG. 2C, the data area structure 230 of the BD-RE is similar to the data area structure 210 of FIG. 2A.

The BCA area 221 has the same role and configuration as the power calibration area and the programmable memory areas 201 and 203 of FIG. 2A, and the lead-in zone 223 includes the lead-in zone 205 and the data zone ( 225 corresponds to data zone 207, respectively. The lead out zone 227 corresponds to the lead out zone 209.

As described above, the structure of the optical recording medium is divided into detailed areas according to the respective purposes, and slightly different for each medium. Optimal power control is performed in the optimal power control counter area and the optimal power control test area.

The structure and role of each of the optical recording media of FIGS. 2A to 2C described above are by way of a specification and will be apparent to those of ordinary skill in the art.

3A is a waveform diagram illustrating signals generated when optimal power control is performed in an error free area.

Referring to FIG. 3A, a tracking error signal (TE) indicates a stable signal level when there is no error in an area to be recorded in the optical recording medium. That is, the signal can be kept clean without noise. The TRACKING DRIVE signal is a signal generated in response to a trekking error signal and becomes an offset signal that is applied to remove noise generated when reading data.

Since there is no noise in the trekking error signal TE, the trekking drive signal TRACKING DRIVE, which is applied to remove it, also exhibits a stable signal level.

The RFPI signal is a signal obtained by irradiating light onto the optical recording medium and reflecting the light. Where the signal level is high, a lot of light is reflected, which means that the light is irradiated where no data is recorded. Where the signal level is low, there is a slight reflection of the light, which means that the light is irradiated where the data is recorded.

The write gate signal is a signal that allows a write operation to be performed, and a write operation of data is performed when the write gate signal is at a logic high level.

FIG. 3B is an enlarged view of a portion of the waveform in FIG. 3A.

Referring to FIG. 3B, there is shown an enlarged waveform diagram of a portion of FIG. 3A. Part (a) is a signal section that is generated when the track is repositioned by one rotation, regardless of whether noise is generated.

As described above in Figs. 3A and 3B, the tracking error signal has a stable level when there is no error, i.e., when the optical recording medium is properly produced.

4A is a waveform diagram illustrating signals generated when optimal power control is performed in an error region.

Referring to FIG. 4A, when optimal power control is performed in an error region, the level of the trekking error signal TE is very unstable. That is, the magnitude of the generated noise is larger than the total amplitude of the tracking error signal in the case of stability.

Since the level of the trekking error signal TE is unstable, the trekking drive signal TRACKING DRIVE generated to compensate for this also has an unstable logic level.

4B is an enlarged view of a portion of the waveform in FIG. 4A.

When trekking an incorrectly produced optical recording medium, the tracking error signal periodically exhibits a waveform of a signal that is very large and small. The trekking drive signal TRACKING DRIVE also changes according to the change of the trekking error signal TE.

As described above, when the optical recording medium is erroneously created, that is, when there is an error, an optimum power control operation is performed on an error part of the optical recording medium, and the noise level of the tracking error signal TE generated at that time is performed. Will appear at a level above the initial set value set in the present application. Here, the initial set value is the maximum value of the tracking error signal TE that can be determined as an error-free value, and is a value that varies depending on the design specification of the optical recording / reproducing apparatus and the degree of tuning of the signal.

3A to 4B, the tracking error signal TE is illustrated as an example, but the focus error signal FE also shows a waveform very similar to the tracking error signal TE. In addition, various other error signals generated in the optical recording / reproducing apparatus also exhibit waveforms very similar to those in Figs. 3A to 4B.

5A is a diagram illustrating a method of determining an optimal power control area according to an embodiment of the present invention.

 Referring to FIG. 5A, the mobile station moves to the target area for optimal power control and waits (step 505). Here, first, the count area for optimal power control is checked, and then, the target area is moved and waited.

In operation 525, a noise level of error signals generated when performing an optimal power control (OPC) is obtained. Here, the error signals mean a tracking error signal and a focus error signal. That is, all signals with information on whether or not an error has occurred are error signals.

According to the noise level, it is determined whether to perform optimal power control in the target area (step 545).

The controller 80 of the empty recording / reproducing apparatus according to the present invention, which will be described below, operates according to the method of determining the optimal power control performing region according to the present invention described with reference to FIG. 5A.

5B is a diagram illustrating a method of determining an optimal power control performing region according to FIG. 5B in detail.

6 shows an optical recording / reproducing apparatus according to another embodiment of the present invention.

Hereinafter, a method of determining an optimal power control performing region according to the present invention will be described in detail with reference to FIGS. 5B and 6. At the same time, the optical recording / reproducing apparatus accordingly will be described.

Steps 510 and 520 shown in detail the step 505 of Figure 5a.

First, a write command is started (step 510). The write command is issued from the host 90 and applied to the encoder / decoder 50.

The host 90 generates various command signals or control signals.

The encoder / decoder 50 converts signals (input data) applied from the host 90 into a recording format including an additional signal such as an error correction code (ECC) and outputs them in the form of a bit stream. In addition, the binary signal output from the radio frequency amplifier 40 is restored to the original data and output to the host 90.

The control unit 80 confirms the optimum power control counter area in the optical recording medium 10 via an optical pick up unit (OPU) 20 before data recording. Since the optimum power control counter area has information on how far the recording has been made, the optimum power control counter area is checked to determine the area for performing the optimum power control. Accordingly, the controller 80 moves the optical pickup unit 20 to the optimum power control test region and waits (step 520).

Here, the area determining unit (not shown) provided in the controller 80 may be performed to check the count area and move to the target area to perform the optimal power control.

Here, the controller 80 is a configuration for controlling an overall recording / reproducing process of the optical recording / reproducing apparatus, and typically, a microcomputer MICOM may be used.

The optical pickup unit 20 receives an output signal of the recording LD control unit 30 and records it on the optical recording medium 10 or detects the recorded signal.

The write LD controller 30 outputs a laser diode (LD) control signal according to a signal output from the encoder / decoder 50.

The radio frequency amplifier 40 normalizes the signal detected by the optical pickup unit 20 and outputs it as a binary signal. The servo 70 reads the binary signal of the FR amplifier 40 and generates various error signals such as a tracking error signal TE and a focus error signal FE to control the drive of the drive 60. The drive 60 controls the operation of the optical pickup unit 20 and the motor 15.

The illustrated step 530 details the step 525 of FIG. 5A.

Before performing the optimum power control, the controller 80 transmits a signal detection command of the test area of the optimum power control to the optical pickup unit 20. Then, the servo 70 receives various error signals such as a focus error signal FE, a tracking error signal TE, and the like, and obtains a noise level through analog-to-digital (A / D) sampling (step 530). Here, the noise level is a signal level having a maximum voltage as a logic level of various error signals such as the focus error signal FE and the tracking error signal TE. That is, the voltage value at the peak point becomes the noise level.

The noise level calculation of the error signals may be performed by a noise level calculator (not shown) included in the controller 80.

Steps 550, 540, and 560 illustrated in detail step 545 of FIG. 5A.

In operation 550, it is determined whether the noise level is smaller than or smaller than or equal to the initial set value (or reference value). This determination process is made by the controller 80. Here, the initial set value means the maximum value that the error signals can be recognized as a normal signal. For example, when the tracking error signal TE has a value less than or equal to the initial setting value, it is determined that no abnormality has occurred in the tracking error signal TE. The initial setting value is the maximum value that can be determined as an error-free value in the above-described error signals, and is a value that varies depending on the design specification of the optical recording / reproducing apparatus and the degree of tuning of the signal.

After the control unit 80 checks the noise level, when the noise level is greater than the initial set value, it is determined that the current test area in which the optical pickup unit 20 is moving and waiting is difficult to perform optimal power control. Accordingly, the optimum power control counter is incremented by one (step 540) to give up the current area and move to the new area within the optimum power control test area of the optical recording medium 10 using the driver 60.

In the data recording area, the data recording is made sequentially from the inner circumference area to the outer circumference area. Since the counter represents the data recording area in the order from the inner circumference to the outer circumference, an increment of one counter value means that the data recording area is changed to a neighboring recording area in the direction of the outer circumference.

When the noise level checked by the controller 80 is smaller than or equal to the initial set value, it is determined that the current test area in which the optical pickup unit 20 is moving and waiting is suitable for performing optimal power control. Therefore, optimal power control is performed in the area (step 560).

Since the optimum power control counter has been increased, the optimum power control test region also becomes a new region, and continues to perform step 530 in that region. By configuring the steps as described above, optimum power control is not performed in the problem area. In addition, an optimized optimal power control region may be determined while minimizing steps included in the optimal power control method.

Here, it is possible to determine whether to perform the optimum power control in the target area according to the noise level, and to control the movement of the optical pickup unit according to the noise level may be performed by an execution unit (not shown) provided in the controller 80.

That is, before performing the optimum power control, it is possible to determine whether the optimum power control can be performed by detecting a signal in the optimum power control test area, and if there is an error, the new area may be examined to determine the optimal recording power more stably and accurately. Will be.

As described above, optimal embodiments have been disclosed in the drawings and the specification. Although certain terms have been used herein, they are used only for the purpose of describing the present invention and are not intended to limit the scope of the present invention as defined in the claims or the claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

1 is a view showing a general optical recording medium.

2A is a diagram showing a data area structure of a CD-R / RW disc.

2B is a diagram showing a data area structure of a DVD + R / RW disc.

2C is a diagram illustrating a data area structure of a removable blue ray disc (BD-RE).

3A is a waveform diagram illustrating signals generated when optimal power control is performed in an error free area.

FIG. 3B is an enlarged view of a portion of the waveform in FIG. 3A.

4A is a waveform diagram illustrating signals generated when optimal power control is performed in an error region.

4B is an enlarged view of a portion of the waveform in FIG. 4A.

5A is a diagram illustrating a method of determining an optimal power control area according to an embodiment of the present invention.

5B is a diagram illustrating a method of determining an optimal power control performing region according to FIG. 5B in detail.

6 is a diagram showing an optical recording / reproducing apparatus according to another embodiment of the present invention.

Claims (15)

Identifying an optimum power control counter area, moving to and waiting for a target area to perform optimal power control; Obtaining a noise level of the tracking error signal or the focus error signals generated when data is detected in the optimum power control test region; And And determining whether to start optimal power control in the target area according to the noise level of the tracking error signal or the focus error signals. The method of claim 1, wherein the determining of whether to start the optimal power control is performed. And determining whether or not the noise level is smaller than an initial set value. The method of claim 1, wherein the obtaining of the noise level of the tracking error signal or the focus error signals is performed. And detecting the signal level of the tracking error signal or the focus error signal and converting the signal to analog to digital to obtain the noise level. The method of claim 2, wherein the determining of whether to start the optimal power control is performed. And performing the optimum power control in the target area when the noise level is smaller than the initial set value. The method of claim 2, wherein the determining of whether to start the optimal power control is performed. If the noise level is not less than the initial set value, increasing the optimum power control counter by one, and making the area according to the target area to perform the optimum power control; And And returning to calculating the noise level of the tracking error signal or the focus error signal. The method of claim 3, wherein the step of obtaining the noise level, And a signal having a voltage of a maximum level in the focus error signal or the trekking error signals. The method of claim 2, wherein the initial setting value A method for determining an optimal power control area, characterized in that the value is set differently according to the specification of the optical recording medium device. In the optical recording and reproducing apparatus, Determine a target area to perform optimal power control of the optical recording medium, obtain the noise level of the tracking error signal or the focus error signals before performing the optimum power control, and perform the optimal power control in the target area according to the noise level. And a control unit for determining whether to start. The method of claim 8, wherein the control unit Determining whether the noise level is smaller than an initial setting value, and if the noise level is smaller than the initial setting value, controlling the optical pickup unit to perform the optimum power control in the target area. Playback device. The method of claim 8, wherein the control unit An area determination unit which checks an optimum power control counter area and moves to a target area to perform optimum power control and waits; A noise level calculator for obtaining a noise level of the tracking error signal or the focus error signal; And And an execution unit for controlling the movement of the optical pickup unit by determining whether to start optimal power control in the target area according to the noise level. The method of claim 8, wherein the control unit Determining whether the noise level is smaller than an initial setting value, and if the noise level is smaller than the initial setting value, controlling the optical pickup unit to perform the optimum power control in the target area. Playback device. The method of claim 8, wherein the control unit And if the noise level is not smaller than the initial set value, increase the optimum power control counter by one more, make the area according to the target area, and continuously obtain the noise level of the error signals. The method of claim 8, wherein the control unit And the noise level is obtained by analog-to-digital conversion of the tracking error signal or the focus error signal. The method of claim 8, wherein the control unit And the signal having the maximum level of voltage in the focus error signal or the tracking error signal is determined as the noise level. The method of claim 9, wherein the initial setting value An optical recording and reproducing apparatus, characterized in that the value is set differently according to the specification of the optical recording medium apparatus.

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