KR100840577B1 - Method and apparatus for quality checking of optical disk - Google Patents

Abstract

A method and an apparatus for checking quality of an optical disk are provided to store a disk defect detected through quality check, using an RF(radio frequency) signal reflected from the optical disk in a memory, thereby referring to a defective area in further recording. A method for checking quality of an optical disk comprises the steps of: carrying out recording initialization of the disk inserted in an optical disk recording/reproducing device(502,504); testing defects of the optical disk, using an RF(radio frequency) signal reflected from the optical disk(506); storing defective area information on the optical disk in a memory when detecting defects in the optical disk(514); calculating/displaying recordable capacity except for the defective area of the optical disk(516); and reading the defective area information from the memory and recording data and data control information in the area except for the defective area(520).

Description

METHOD AND APPARATUS FOR QUALITY CHECKING OF OPTICAL DISK}

1 is a flowchart showing a conventional optical disc recording procedure;

2 is a block diagram showing an optical disk recording / reproducing apparatus according to a preferred embodiment of the present invention;

3 illustrates an optical disk defective area according to a preferred embodiment of the present invention;

4 is a view showing an optical disk inspection method using an RF signal according to an embodiment of the present invention;

Fig. 5 is a flowchart showing an optical disc recording procedure in accordance with a preferred embodiment of the present invention.

The present invention relates to a quality checking technique of an optical disc in an optical disc recording / reproducing apparatus. In particular, the quality of an optical disc media is checked through a radio frequency (RF) signal reflected to the optical disc, The present invention relates to a quality checking method and apparatus for an optical disk suitable for displaying a disk defect found through the quality checking.

Today's diversified media types and price competitions lead to a decrease in disc quality, which in turn increases the proportion of discs that cause write failures when writing data. Early disk scans became a more important task. However, it is possible to detect a disc that is not recognized during the initial disc inspection, but if there is a partial defect on the disc, an error cannot be detected without performing the direct recording.

Hereinafter, with reference to the accompanying drawings will be described in detail.

1 is a flowchart showing a conventional optical disc recording procedure.

Referring to FIG. 1, in the conventional optical disc recording / reproducing apparatus, when a disc is inserted in step 102, an initializing process for recording on the disc is performed in step 104, and then an optimal recording power measurement is performed in step 106. Power Calibration: hereinafter called OPC) to record data on the optical disk in step 108 with the recording power set.

In this case, if the optical disc is not in the initial recognition failure, initial recording is performed. If no disc error occurs during recording in step 110, the data recording is completed in step 112 and the reproduction wait is performed. However, if there is a partial defect or an error in the optical disc in step 110, a STOP phenomenon occurs during recording in the errored part. In this case, proceed to step 114 to perform an adjustment algorithm to overcome the recording error. do. In the case of an error that can be overcome by the adjustment algorithm, for example, a data transmission error or a buffer underrun error, which is not an error on the disk media, recording is continued through error recovery in step 116. If no disk error occurs, recording is completed in step 112.

However, if error recovery is not possible in step 114, that is, a self-defect on the disc media, a recording stop occurs during recording, in which case the optical disc recording device displays a "DISC POOR" message and retry recording. If the error continues to occur, recording stops and a message indicating the failure of recording is displayed on the screen.

In the conventional optical disc recording method operating as described above, if an optical disc with a partially defective error occurs during recording, the recording operation is stopped and the optical disc with the error cannot be written. This initial recognition is possible, but there is no recovery plan for a disk that has a partial defect on the disk.

The present invention is to overcome the limitations of the prior art described above, by checking the quality of the optical disk media through the RF signal reflected on the optical disk, and stores the disk defects found through the quality check in the memory for later recording A method and apparatus for checking quality of an optical disk capable of recording data with reference to a defective area.

Another object of the present invention is to provide a method and apparatus for predicting a recording success rate and checking the quality of an optical disk media through an RF signal reflected on the optical disk, and checking the media quality through the media quality check.

According to an embodiment of the present invention, a method of performing recording initialization of a disc inserted into an optical disc recording / reproducing apparatus, performing an optical disc defect inspection by using an RF signal reflected on the optical disc, and When a disc defect is detected in the optical disc, storing defect area information of the optical disc on a memory, calculating and displaying a recordable capacity excluding the defective area in the optical disc, and displaying data on the optical disc When performing the recording, reading the defective area information from the memory and recording data and data control information in an area excluding the defective area.

In one embodiment of the present invention, an apparatus includes an optical pickup unit for performing a total scan by reflecting a constant light onto an optical disk inserted into an optical disk recording / reproducing apparatus, and an optical disk using an RF signal reflected on the surface of the optical disk. Performing a defect inspection (DDE), and when a disk defect is detected on the optical disc, transferring defect area information of the optical disc to a memory, calculating a recordable capacity excluding the defective area on the optical disc, and calculating And a memory for storing the defect area information transmitted from the control part, wherein the control part reads the defective area information from the memory when data is written to the optical disc, and the defective area. And recording data and data control information in an area excluding.

Hereinafter, the operating principle of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, when it is determined that a detailed description of a known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

The present invention checks the quality of optical disc media through RF signals reflected on optical discs, including CDs and DVDs, displays the prediction rate of recording success and displays information on them, and stores the disc defect area information found through the quality check in the memory. The data is recorded by referring to the defective area stored in the memory for later recording.

2 is a block diagram showing an optical disk recording / reproducing apparatus according to a preferred embodiment of the present invention.

Referring to FIG. 2, the optical disc recording / reproducing apparatus includes an optical pickup unit 202, an optical driver 204, a channel bit encoder 206, a digital record signal processor 208, and an RF unit 210. And the digital reproduction signal processing unit 212, the servo unit 214, the driving unit 216, the control unit 218, the key input unit 110, the memory 212, the spindle motor 214, and the sled. Motor 216 and the like.

The optical pickup unit 202 records the optical drive signal of the optical drive unit 204 on the optical disc 200, detects the signal recorded from the optical disc 200, and transmits the signal to the RF unit 210. To this end, a laser diode (LD) for irradiating an optical beam to the optical disk 200 to record data on the optical disk 200 and an optical beam to the optical disk 200 to irradiate the optical disk 200 to the optical disk 200. It includes a photo diode (PD) for reading recorded data. The optical driver 204 converts the signal of the channel bit encoder 206 into an optical drive signal for recording on the optical disk 200 and transmits the signal to the optical pickup unit 202.

The channel bit encoder 206 reconverts the data converted into the recording format into a bit stream and delivers the data to the optical driver 204. The digital recording signal processing unit 208 adds an error correction code (ECC) or the like to the input digital data, converts it into recording format data, and transfers it to the channel bit encoder 206. The RF unit 210 amplifies and waveform-shapes the RF signal detected by the optical pickup unit 202 and modulates a modulated signal, such as an EFM (Eight to Fourteen Modulation) signal, to the controller 218 or the digital reproduction signal processor 212. To pass.

The servo unit 214 controls the driving of the driving unit 216 from the tracking error (TE) and focus error (FE) signals of the optical pickup unit 202 and the rotational speed of the optical disc 200. . The digital reproduction signal processor 212 digitally processes the EFM signal of the RF unit 210 and restores the original data to output the reproduced data. The driver 216 drives the sled motor 216 for moving the optical pickup 202 and the spindle motor 24 for rotationally driving the optical disc 200.

When the OPC of the recordable optical disk 200 is performed, the controller 100 stores the recording voltage information according to the OPC performance in the memory 212 and performs data recording of the optical disk 210 with the set optimal recording voltage. . In addition, after checking whether the media is defective by initial disk inspection before recording the data of the inserted optical disc 200, the quality of the media is checked to store defect area information of the recording medium in the memory 212, and the recording success rate and The recordable capacity is predicted and controlled to be displayed.

The key input unit 110 is a portion for inputting a key signal for recording and reproducing the recordable optical disc 200 or for performing disc detection examination (hereinafter referred to as DDE). The memory 120 is a memory device such as an SDRAM or an EEPROM, and stores the optimal recording voltage information obtained by performing the OPC of the optical disc 200, and information such as the accumulation count, focus and tilt offset, and radial gain. The information on the defect area detected through the disk defect inspection is stored.

The optical disc recording and reproducing apparatus according to the embodiment of the present invention having such a configuration, if a DDE command is input before recording the disc from the key input unit 210, performs the DDE in the control unit 218. In order to determine the state of the disk, the optical pickup unit 202 emits a constant light to perform a full scan. The RF signal reflected from the surface of the disk is received by the RF unit 210, and when the received RF signal is transferred to the controller 218, the controller 218 compares the received RF signal with a preset threshold.

That is, the control unit 218 compares the received RF signal with a preset threshold as shown in FIG. 3, and determines that a region where the amplitude of the RF signal is larger than the preset threshold is a defective region that causes an error in recording. can do. In addition, a defect area may be found by examining an internal parity (PI) state according to the received RF signal.

This detects defects in the areas 401 to 405 through the DDE, as shown in FIG. The detected defective areas are numbered and stored in the memory 212, and then the user is controlled to display the total recordable capacity in which the defective parts are subtracted when the defect information is displayed. This allows the user to know the state of the media before recording. Subsequently, when a user inputs a recording command to the key input unit 210, the controller 218 records the data with reference to the defect area information stored in the memory 212 so that data is recorded to avoid the defect area.

5 is a flowchart showing an optical disc recording procedure according to a preferred embodiment of the present invention.

Referring to FIG. 5, when the disc is inserted in step 502, the optical disc recording / reproducing apparatus performs an initialization process for recording on the disc in step 504, and then performs OPC in step 606 to set the recording power. In step 508, it is checked whether a DDE check is performed before data recording on the optical disk.

If the user does not perform the DDE check, the process proceeds to step 510 to perform data recording as in the prior art. However, if the user inputs a signal for performing the DDE check, the process proceeds to step 512 in which the optical pickup unit 202 emits a constant light to perform a full scan in order to determine the state of the disk. When the RF signal reflected from the disk surface is received by the RF unit 210 and transmitted to the control unit 218, the defect area detection in the control unit 218 may be detected by performing a PI test according to the RF signal, or detecting the RF signal. A portion showing an amplitude higher than the threshold value is detected as a defective area compared with a preset threshold value.

However, if the defect area is not detected in step 514, the process proceeds to step 510 to perform data recording. If the defect area is detected, the process proceeds to step 516 to store the disk defect area information in the memory first, and the writing success rate according to the disk defect. Information and recordable capacity information are displayed for the user to view. Thereafter, in step 518, recording is waited, and in step 520, a recording execution signal is input from the user, or after a predetermined time, the recording / reproducing apparatus automatically records data on the optical disc.

At this time, writing is performed in the data and data control information area except the defective area with reference to the defective area information read out from the memory.

As described above, the present invention checks the quality of the optical disk media through the RF signal reflected on the optical disk, and predicts the recording success rate and information on the recording success rate through the media quality check.

Meanwhile, in the detailed description of the present invention, specific embodiments of the optical disc including the CD and the DVD have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by those equivalent to the scope of the claims.

In the present invention operating as described in detail above, the effects obtained by the representative ones of the disclosed inventions will be briefly described as follows.

According to the present invention, after checking a disc for initial disc recognition, the disc status is displayed on a screen to enable recording related prediction to the user, and the disc is controlled to be recorded only on a part without defect, thereby preventing errors during recording. It can work.

Claims (6)

Performing recording initialization of the disc inserted in the optical disc recording / reproducing apparatus; Performing an optical disc defect inspection (DDE) using the RF signal reflected from the optical disc; When a disk defect is detected in the optical disk, storing defect area information of the optical disk on a memory; Calculating and displaying a recordable capacity of the optical disc excluding a defective area; When performing data recording on the optical disk, reading out defective area information from the memory and recording data and data control information in an area excluding the defective area. Quality check method of the optical disk comprising a. The method of claim 1, The process of performing the disk defect check, And recognizing the area as the defective area when the RF signal reflected by the optical disc exhibits an amplitude greater than a predetermined threshold value. The method of claim 1, The process of performing the disk defect check, And scanning the entire surface of the optical disk to check an internal parity (PI) state according to an RF signal to detect the defective area. An optical pickup unit which reflects constant light onto an optical disc inserted into the optical disc recording / reproducing apparatus and performs a full scan; An optical disk defect inspection (DDE) is performed using the RF signal reflected on the optical disk surface, and when a disk defect is detected in the optical disk, the defect area information of the optical disk is transferred to a memory, and the optical disk A control unit for calculating a recordable capacity excluding a defective area in the control unit and controlling the calculated capacity information to be displayed; A memory for storing the defect area information transmitted from the controller; Including; And the control unit reads out defective area information from the memory when writing data to the optical disc, and records data and data control information in an area excluding the defective area. The method of claim 4, wherein The control unit, And when the RF signal reflected by the optical disc exhibits an amplitude greater than a preset threshold, the area is recognized as the defective area. The method of claim 4, wherein The control unit, And scanning the entire surface of the optical disk to inspect an internal parity (PI) state according to an RF signal to detect the defective area.

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