KR20070013125A - Method for reading media information of optical disc - Google Patents

Abstract

A method for reading media information of an optical disc is provided to detect a stable information reading position in a media information recording area in consideration of an eccentricity component of a light scribe disc and stably read the media information from the detected information reading position. When an optical disc is safely rested, a microcomputer moves an optical pickup to a specific area which exists on the same track as a media information recording area. The microcomputer moves the optical pickup to a middle position on a radius of the specific area. The microcomputer detects a certain signal from the moved position. The microcomputer determines the optimum position according to whether to normally detect the certain signal(S40,S50,S51). The microcomputer reads media information from the media information recording area on the basis of the optimum position(S52).

Description

Method for reading media information of optical disc}

1 shows the layout of the label surface of a Light Scribe disc,

FIG. 2 illustrates a Control Feature Outer Ring region located in a Control Feature Zone of the Light Scribe disc.

3 is a block diagram of an embodiment of an optical disk device in which a method for reading media information of an optical disk according to the present invention is implemented.

4 to 6 show a flow of a preferred embodiment of the method for reading media information of an optical disc according to the present invention.

7 illustrates a detailed structure of the Control Feature Zone and recorded index mark patterns,

FIG. 8 shows an example in which an optical pickup is moved to a radially intermediate position of the saw-teeth area of the light scribing disc according to the present invention.

※ Explanation of code for main part of drawing

M: Spindle Motor 10: Optical Disc

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

60: encoder 70: servo unit

71: drive unit 80: micom

81: memory

The present invention relates to a method of reading media information of an optical disc, which makes it possible to stably read media information in spite of an eccentric component in a light scribing disc capable of label printing.

A light scribing disc is an optical disc capable of recording data on a data side as well as label printing on a label side in any manner. The layout of the label side of the light scribing disc is shown in FIG. Same as one.

FIG. 2 illustrates a Control Feature Outer Ring region located in a Control Feature Zone of the Light Scribe disc. As shown in FIG. 2, the Control Feature Outer Ring region includes the Index Mark region and the Saw-teeth region. And media ID fields (Media ID Fields 1, 2, and 3), and media IDs are separately recorded in the three non-contiguous media ID areas.

On the other hand, when recording on the data surface, there is a tracking guide signal such as a wobble signal to compensate for eccentricity and track following is possible, but the Control Feature Outer Ring region is vulnerable to eccentricity because there is no guide signal.

In order to print a label on the Light Scribe disc, a drive must first move to the Control Feature Outer Ring region and read out media information in the moved region. In this case, the Control Feature Outer through the index mark. It can be easily moved to the ring area.

After the movement, the drive reads the media information such as the media ID from the moved Control Feature Outer Ring area and transmits it to the external host (PC) to which the signal is connected. In this case, the drive is divided into three non-contiguous fields. The media ID is sequentially read out and transmitted.

Accordingly, the host side compares the transmitted media ID with a media ID previously stored in a DB form, and determines whether the media ID is normally read from the host ID. If the ID is not normally read (when any one of the three recorded media IDs is not normally read), the drive moves back to the Control Feature Outer Ring area and reads the media information from the moved area. Do it.

As described above, the information reading in the Control Feature Outer Ring region may be unstable due to the eccentric component of the Light Scribe disk. In this case, a lot of time is required for reading the information in the Control Feature Outer Ring region. As a result, there was an inefficient problem of delayed recording on the label surface of the Light Scribe disc.

Accordingly, the present invention has been made to solve the above problems, and in consideration of the eccentric component of the Light Scribe disc, it is possible to detect a stable information reading position in the media information recording area and to stably read the media information therefrom. An object of the present invention is to provide a method of reading media information of an optical disc.

According to an aspect of the present invention, there is provided a method of reading media information of an optical disc, comprising: a first step of moving to a specific area on the same track as the media information recording area when the optical disc is seated; A second step of moving to an intermediate position on the radius of the specific region; A third step of detecting a predetermined signal from the moved position; A fourth step of determining an optimum position based on whether the predetermined signal is normally detected; And a fifth step of reading media information from the media information recording area on the basis of the optimum position.

Best Mode for Carrying Out the Invention A preferred embodiment of the method for reading media information of an optical disc according to the present invention will now be described in detail with reference to the accompanying drawings.

3 is a block diagram of an embodiment of an optical disk apparatus in which a method of reading media information of an optical disk according to the present invention is implemented. The digital recording apparatus converts the input digital data into a recording format by adding an error correction code (ECC) or the like. A 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 the input signal; An optical pickup (20) for recording a signal on the optical disc (10) in accordance with the light quantity driving signal and for detecting a recording signal from the recording surface; An R / F unit 50 for shaping the signal detected by the optical pickup 20 and outputting it as a binary signal; An encoder (60) for detecting spokes recorded on the optical disc (10); A drive unit 71 for driving a spindle motor M for rotating the optical pickup 20 and the optical disc 10; A servo unit 70 for controlling the driving of the drive unit 71 from the tracking error signal T.E and the focus error signal F.E and the rotational speed of the optical disc 10 outputted from the optical pickup 20; A digital reproduction signal processor (30b) for restoring the binary signal to original data with its own clock synchronized with the binary signal; A memory 81 in which media information such as a media ID is stored; And a microcomputer 80 that reads out media information from the inserted seated optical disk 10 and transmits the media information to an external host (PC) stored and signaled to the memory 81, and controls and performs a requested recording or reproducing operation. Consists of included.

4 to 6 illustrate a flow of a preferred embodiment of a method of reading media information of an optical disc according to the present invention. Hereinafter, the media information of FIGS. 4 to 6 according to the present invention will be described with reference to the configuration of FIG. 3. The method will be described in detail.

First, when the optical disk 10 is inserted and seated, the microcomputer 80 determines whether the optical disk 10 is a light scrib disk. Since the light scrib disk has spokes recorded in a control feature zone unlike a general disk, From this, it is possible to simply determine whether the optical disk 10 is a light scribing disk.

As a result of the determination, when the optical disk 10 is a light scrib disk (S10), the microcomputer 80 determines whether the insertion surface of the optical disk 10 is a label surface (S20), which is the light scrib disk. Since the position of the label surface and the data surface are different from each other, the insertion surface of the optical disk 10 can be determined from the positions of the reflective surface. Since the focus level of the objective lens with respect to the label surface is different from each other, the insertion surface of the optical disc 10 may be determined from this.

As a result of the determination, when the insertion surface of the optical disc 10 is a label surface, the microcomputer 80 may drive the optical pickup 20 to the optical disc 10 through the servo unit 70 and the drive unit 71. The optical disk 10 is rotated by moving to the innermost circumference of the and driving the spindle motor (M).

Subsequently, the microcomputer 80 moves the optical pickup 20 to the Control Feature Zone from the innermost circumference of the Light Scribe disc (S21). The Control Feature Zone is shown in FIG. The Control Feature Outer Ring is divided into a Mirror Area, and the Control Feature Outer Ring is divided into an index mark area, a saw-teeth area, and a media ID area as shown in FIG. 2. 2, 3), the Control Feature Outer Ring region can be easily found from the index marks recorded in the index mark region, and the spokes can be synchronized to O. FIG.

When the optical pickup 20 enters the control feature zone, the microcomputer 80 enters the optical pickup 20 into a control feature outer ring region in the control feature zone, and the optical pickup 20 enters the control feature zone. When the index mark recorded in the Control Feature Outer Ring area is detected (S30), the microcomputer 80 synchronizes the spokes to zero.

The encoder 60 detects spokes recorded on the optical disc 10 when the optical disc 10 rotates, and the microcomputer 80 detects the detected spokes with the spokes synchronized to zero. In the counting operation (S31), typically, when one rotation of the optical disc 10 is performed, 400 spokes (0 to 399) are detected and counted.

While detecting and counting spokes from the optical disk 10 that is rotated as described above, the microcomputer 80 starts position of a saw-teeth region in the control feature outer ring on the optical disk 10 based on the counted spoke values. As shown in FIG. 2, as shown in FIG. 2, the saw-teeth area on the optical disc 10 is located at two locations, and the spoke detected at one rotation of the optical disc 10 is 400 and the spoke 0 is positioned. Assuming that the spoke values range from 66 to 134 and the range corresponding to 266 to 334 are designated as saw-teeth regions, the microcomputer 80 displays the current position when the detected counted spoke value is 66. Judging by the start position of the area.

As such, when the current position is determined as the start position of the saw-teeth region, the microcomputer 80 positions the optical pickup 20 to a middle position in the radius of the saw-teeth region as shown in FIG. 8 (S33). In this state, while counting the RF signal detected from the start position of the saw-teeth area of the optical disk 10 rotated in such a state, the length of each detected RF signal is detected (S34). Since eight teeth (n) are recorded in the saw-teeth area, the number of RF signals detected and counted from one saw-teeth area is 16 (2n).

That is, since two saw-teeth regions exist on the optical disc 10, 32 RF signals should be detected and counted from the saw-teeth region during one rotation of the optical disc 10.

Therefore, when one rotation of the optical disc 10 is completed (S40), that is, when the detected counted spoke value is 400, the microcomputer 80 sums the lengths of the detected RF signals and adds the average value L. FIG. On the other hand, it is determined whether all the teeth recorded in the saw-teeth area of the optical disc 10 have been normally read from the number of the detected counted RF signals, i.e., if there is no eccentric component in the optical disc 10. The teeth recorded in the saw-teeth area should be read normally based on the radial intermediate position of the moved saw-teeth area. If there is an eccentric component, the recorded teeth are read normally based on the moved position. Because it may not lose.

If the recorded teeth are all read normally, that is, if the number of detected RF signals during one revolution of the optical disc 10 is a normal value (32) (S50), the microcomputer 80 generates the Saw. The current position (middle position) on the radius of the -teeth region is detected as the optimal position (S51).

However, if the number of detected RF signals during one rotation of the optical disc 10 is not the normal value (32), the microcomputer 80 may move the optical pickup 20 from the moved intermediate position. Alternatively, a predetermined distance (for example, 30 μm) is moved to the outer circumference, and the determination of whether to move to the inner circumference or the outer circumference is based on the detected average value L (S80).

That is, the microcomputer 80 has a tooth value recorded in the saw-teeth area on the basis of an intermediate position in the radius of the saw-teeth area in which the detected average value L is stored in advance. If all are normally read, the length of one RF signal or the average value of the detected RF signals is smaller than that (S90). The optical pickup 20 is moved in the inner circumferential direction from the moved intermediate position. If the detected average value L is greater than the reference value Lm (S100), the optical pickup 20 is moved from the moved intermediate position in the circumferential direction (S91). S101).

As the optical pickup 20 moves a predetermined distance, the microcomputer 80 performs the above operation including an RF signal count and an RF signal length detection operation detected based on the moved position. If the number of detected RF signals through the re-execution is a normal value (32), the microcomputer 80 detects the current position on the radius of the saw-teeth region as an optimal position. If the number of the detected counted RF signals is still not normal even after re-execution, the microcomputer 80 may perform the inner or outer movement of the optical pickup 20 and the subsequent operation within the predetermined number of times. do.

On the other hand, in the above embodiment, when no RF signal is detected from the saw-teeth area of the optical disc 10, the microcomputer 80 causes the optical pickup 20 to present the radial current of the saw-teeth area. The predetermined distance is moved from the position to the inner circumferential or outer circumferential direction of the optical disc 10, and the above-described operation following the movement is performed again.

When the optimum position on the radius of the saw-teeth region is detected, the microcomputer 80 reads the media information recorded in the control feature outer ring region based on the detected optimal position. By doing so (S52), even if there is an eccentric component in the optical disc 10, the media information can be stably read.

Meanwhile, the microcomputer 80 stores the read media information in the memory 81 and transmits the read media information to an external host (S53), and at the time of recording request (S60), transmits the data transmitted from the host to the optical disc 10. (Label printing) is recorded in the label zone (S61, S70).

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 would be possible.

In the media information reading method of the optical disc according to the present invention, the stable information reading position in the media information recording area is detected in consideration of the eccentric component of the Light Scribe disc, and the media information is read from the detected position. The information is read out quickly and stably, and from this, the recording of the label surface of the Light Scribe disc is also a very useful invention.

Claims (13)

A first step of moving to a specific area on the same track as the media information recording area when the optical disc is seated; A second step of moving to an intermediate position on the radius of the specific region; A third step of detecting a predetermined signal from the moved position; A fourth step of determining an optimum position based on whether the predetermined signal is normally detected; And And a fifth step of reading media information from the media information recording area on the basis of the optimum position. The method of claim 1, And the optical disc is a Light Scribe disc. The method of claim 1, And the media information recording area is in a control feature outer ring area. The method of claim 3, And the specific area is a saw-teeth area existing in the control feature outer ring area. The method of claim 1, And the predetermined signal is an RF signal. The method of claim 1, And the third step further comprises detecting a length of each detected signal. The method of claim 6, And wherein said third step is performed during one revolution of said optical disc. The method of claim 7, wherein And the fourth step is to determine an intermediate position in the radius of the specific area as an optimal position when the number of the predetermined signals detected during one rotation of the optical disc is a normal value. The method of claim 8, And the normal value is a number corresponding to twice the number of teeth recorded in the specific area. The method of claim 7, wherein The fourth step may include comparing an average value of the lengths of the detected predetermined signals with a previously stored reference value when the number of the predetermined signals detected during one rotation of the optical disc is not a normal value; Moving a predetermined distance from the moved position in an inner or outer circumferential direction according to the comparison result; Detecting a predetermined signal from the moved position; And And determining an optimum position based on whether the predetermined signal is normally detected. The method of claim 10, The reference value is the length of one RF signal or the average value of the lengths of each RF signal when all the teeth recorded in the specific area are read normally based on the intermediate position on the radius of the specific area. How to read media information. The method of claim 11, And, if the detected mean value is smaller than the reference value, the media information reading method of the optical disc, characterized in that the predetermined distance moves in the inner circumferential direction. The method of claim 11, And, if the detected average value is larger than the reference value, the media information reading method of the optical disc moves from the moved position in a circumferential direction.

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