KR100569539B1 - Method for discriminating disc class of optical record medium - Google Patents

Abstract

The present invention is to prevent the type discrimination error of the optical disc by the method of sequentially changing the laser irradiation position for disc type determination, for this purpose, the present invention, the signal is reflected by irradiating the laser to the optical disc In contrast to the conventional method of determining the type of optical disk by detecting a and calculating the distance between the surface of the optical disk and the recording surface based on the detected reflected signal, an external factor when irradiating a laser to the optical disk When there is no reflection on the surface of the disc, the disc is rotated by a predetermined interval and the optical pickup is moved by a predetermined interval in the circumferential direction of the disc to irradiate the laser again to a new position of the disc. Calculate the gap between the surface and recording surface, and nevertheless When it is impossible, by determining the type of the disc based on the measurement result of the peak value of the detection waveform on the recording surface of the disc, it is possible to solve the problem of excessive time required in the reproducing mode due to the disc type determination error, as well as the optical disc. It is possible to enhance the ease of use of the playback device users.

Description

Disc type determination method of optical recording medium {METHOD FOR DISCRIMINATING DISC CLASS OF OPTICAL RECORD MEDIUM}

1 is a block diagram of a typical optical disc reproducing apparatus suitable for determining a disc type of an optical record carrier according to a preferred embodiment of the present invention;

2 is a flowchart illustrating a process of determining a disc type of an optical recording medium according to a preferred embodiment of the present invention;

3A and 3B are waveform diagrams showing detection waveforms on the surfaces and recording surfaces of DVD and CD discs;

4 is a detection waveform diagram of detecting a reflected signal by irradiating DVD LD on a disc;

<Description of the code | symbol about the principal part of drawing>

102: control block 104: servo control block

106: disk motor 108: optical system

110: optical disk 112: RF / servo error generation block

114: decoding block

The present invention relates to a technique for determining the type of optical recording medium, and more particularly, to a disc type discrimination method of an optical recording medium suitable for discriminating disc types of CD and DVD having different optical recording structures.

In general, a type of optical disc includes a compact disc (CD) and a digital versatile disc (DVD). Such an optical disc can be reproduced through an optical disc reproducing apparatus having playback compatibility. Therefore, when the optical disc is loaded, the optical disc reproducing apparatus first determines whether the loaded optical disc is a CD or a DVD, and then sets the reproduction mode to the CD mode or the DVD mode according to the determination result.

As is well known, DVD is not only higher in recording density than CD, but also shorter from the surface of the disc to the recording surface. In other words, the DVD has a distance of 0.6 mm from the surface of the disc to the recording surface, whereas the CD has 1.2 mm.

Therefore, conventionally, when an optical disk is loaded, the optical disk is recognized as a DVD or a CD by detecting a reflected signal by irradiating a laser to the disk and calculating a distance between the surface and the recording surface of the optical disk based on the detected reflected signal. Whether or not it is recognized is determined.

On the other hand, if a certain area of the disk is bent (wobble) or there is a seismic component, antireflection may occur on the surface of the disk. In the conventional method of calculating the spacing of the surfaces, it is common to be unable to determine the type of optical disk due to the non-reflection of the surface of the disk, and in this case, processing with "No Disc" or "Bad Disc" or randomly There is a problem that a disc play mode, that is, a disc or a disc even though it is a DVD, or a DVD even though it is a CD, generates an error, and this problem eventually takes an unnecessary amount of time to set the play mode. Or it may cause an error of the firmware or the like, which makes the disc impossible to play.

Accordingly, the present invention is to solve the above problems of the prior art, the disk of the optical recording medium that can prevent the type discrimination error of the optical disc by the method of sequentially changing the laser irradiation position for disc type determination The purpose is to provide a method for determining the type.

According to one aspect of the present invention, there is provided an apparatus for determining the type of a disc loaded in an optical disc reproducing apparatus having means for rotating the disc and an optical means for reproducing data recorded on the disc by irradiating a laser. A method, comprising: a first process of driving the optical means to detect reflected wavelengths on the disc surface and the recording surface when the disc is loaded, and a second process of checking whether there is no reflection on the surface of the loaded disc And, when the anti-reflection is checked, rotate the loaded disc by a predetermined 1 / n interval and move the optical means by a predetermined interval in the circumferential direction of the loaded disc to set the new laser irradiation position. And a third step of repeating the first and second steps, and the reflected wave on the surface of the loaded disk. A fourth process of repeating the third process as much as one revolution of the loaded disc until it is detected, and when the reflected wavelengths on the surface and the recording surface of the loaded disc are detected through each process And a fifth step of measuring a distance between the reflection wavelength on the surface and the reflection wavelength on the recording surface, and determining whether the loaded disk is a DVD or a CD based on the measurement result. Provides disk type determination method.
According to another aspect of the present invention, there is provided an apparatus for determining the type of a disc loaded in an optical disc reproducing apparatus having means for rotating the disc and an optical means for reproducing data recorded on the disc by irradiating a laser. A method, comprising: a first process of driving the optical means to detect reflected wavelengths on the disc surface and the recording surface when the disc is loaded, and a second process of checking whether there is no reflection on the surface of the loaded disc And, when the anti-reflection is checked, rotate the loaded disc by a predetermined 1 / n interval and move the optical means by a predetermined interval in the circumferential direction of the loaded disc to set the new laser irradiation position. A third process of repeating the first process and the second process, and the reflection on the surface of the loaded disk. A fourth process of repeating the third process as much as one revolution of the loaded disc until the field is detected, and when the reflected wavelengths on the surface and the recording surface of the loaded disc are detected through each process Measuring a distance between the reflection wavelength on the surface and the reflection wavelength on the recording surface, and determining whether the loaded disk is a DVD or a CD based on the measurement result; A sixth step of detecting a reflection waveform on the recording surface by irradiating a laser to the loaded disk when the antireflection is detected during one rotation, a seventh step of measuring a peak value of the measured reflection waveform, and And an eighth process of determining whether the loaded disc is the DVD or the CD by comparing the measured peak value with a preset DVD and CD reference recording surface waveform. It provides a disc type determination method of the recording medium.

delete

The above and other objects and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention described below with reference to the accompanying drawings by those skilled in the art.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

A key technical aspect of the present invention is to detect a type of an optical disc in such a manner as to detect a signal reflected by irradiating a laser onto the optical disc and calculate a distance between the surface and the recording surface of the optical disc based on the detected reflected signal. Unlike the conventional method described above, when the laser is irradiated to the optical disk, the optical disk is rotated by a predetermined interval when there is no reflection from the surface of the disk due to external factors, and at the same time, the optical pickup is rotated in the peripheral direction of the disk. The distance between the surface and the recording surface at different positions of the disc can be calculated by moving the laser beam to a new position of the disc again, and through this technical means, the object of the present invention can be easily achieved.

In addition, in the present invention, when the surface antireflection is continuously detected during one rotation of the disc by performing the optical disc rotation and the optical pickup movement by the nth order due to the surface antireflection, the peak value of the detection signal detected on the recording surface is measured. In addition, technical means for discriminating the type of disc is employed by comparing the measurement result with the waveform statistics of the recording surfaces of the preset DVD and CD.

1 is a block diagram of a typical optical disc reproducing apparatus suitable for determining a disc type of an optical recording medium according to a preferred embodiment of the invention, which includes a control block 102, a servo control block 104, a disc motor 106, Optics 108, RF / servo error generation block 112, and decoding block 114.

Referring to FIG. 1, the control block 102 performs overall operation control of an optical disk reproducing apparatus including a microprocessor, for example, when a loading detection signal is input from a disc loading detection sensor (not shown). In response thereto, a servo control signal for disc search is generated and provided to the servo control block 104, and a decoding control signal for video and audio signals to be reproduced according to the reproduction operation of the optical disc is generated and provided to the decoding block 114. do.

In addition, the control block 102, according to the present invention, the RF system detects the waveform detection signal detected from the surface and the recording surface of the disk by irradiating the disk 110 or CD LD or DVD LD by the optical system 108 at the time of disk loading. It is determined whether or not the loaded disc provided from the / servo error generation block 112 is a DVD or a CD, and based on the result of the determination, control of setting the play mode of the disc to the DVD mode or the CD mode is performed.

Next, the servo control block 104 drives a focus servo driver for driving the focus actuator of the optical pickup in the optical system and the tracking actuator of the optical pickup in the optical system, for example, to move the optical pickup up and down. It includes a tracking servo starter for driving the tracking actuator of the optical pickup to move the objective lens in the radial direction, the focus error signal (FE) and the tracking error signal (TE) provided from the RF / servo error generation block 112 On the basis of), a driving signal for driving each actuator in the optical system 108 is generated and provided to the optical system 108.

In addition, the disc motor 106 rotates the loaded disc 110 in the radial direction based on the drive signal provided from the sub control block 104 in the disc loading or reproducing mode.

On the other hand, the optical system 108 includes, for example, an optical pickup having an objective lens, a focus actuator, a tracking actuator, and the like. The optical system 108 converts a reproduction signal read from the optical disk 110 into an electrical signal to convert an RF / servo error. Forward to generation block 112.

Next, the RF / servo error generation block 112 detects an RF signal for reproducing data, a focus error signal for tracking and a tracking error signal, and the like, from an electrical signal provided from the optical system 108, thereby reproducing an RF signal (reproduction Data) to the decoding block 114, and focus error signal and tracking error signal to the servo control block 104. In addition, the RF / servo error generation block 112 transmits the waveform detection signals at the surface and recording surface of the disk provided from the optical system 108 to the control block 102 when the disk is loaded.

In addition, the decoding block 114 separates the playback data provided from the RF / servo error generation block 112 into video data and audio data, and then demodulates each data into original data before compression, and the like. The demodulated video data is delivered to the display side, not shown, and the demodulated audio data is delivered to the speaker side, not shown.

Thus, the demodulated video and audio data is passed to the monitor and speaker side after the DAC process, not shown, so that video and audio reproduced on the disc will be output.

Next, a process of determining the disc type of the optical record carrier according to the present invention using the optical disc reproducing apparatus having the above-described configuration will be described.

2 is a flowchart illustrating a process of determining a disc type of an optical recording medium according to a preferred embodiment of the present invention.

Referring to FIG. 2, when a disc is loaded into a disc loader (not shown) of the optical disc reproducing apparatus (step 202), the control of the control block 102 based on the loading detection signal provided from the loading detection sensor (not shown) is performed. Accordingly, the optical system 108 is set to a setting, for example, a position to irradiate the CD LD (step 204).

Subsequently, the optical system 108 detects a reflection signal by irradiating a laser to a predetermined position of the loaded disk 110 (i.e., the reflection on the surface of the disk 110 and the reflection on the recording surface), and the detection here. The reflected signal is transmitted to the control block 102 via the RF / servo error generation block 112 (step 206).

Next, the control block 102 checks whether there is no reflection on the surface of the disk 110, that is, checks whether there is a wavelength detection signal due to laser reflection from the surface of the disk (step 208). As a result of the check in, if there are any wavelength detection signals on the surface of the disk and on the recording surface, as shown in Figs. 3A and 3B as an example, the wavelength detection signal on the surface of the disk and the wavelength detection signal on the disk recording surface are shown. On the basis of the interval therebetween, it is determined whether the loaded disc 110 is a DVD or a CD (step 210), and the playback mode is set to the DVD mode or the CD mode based on the determination result (step 224). ).

That is, FIG. 3A in which the wavelength detection signals at the disc surface and the recording surface are at interval t1, and FIG. The wavelength detection signal at is measured, and the distance between the reflection detection wavelength on the disk surface and the reflection detection wavelength on the disk recording surface is measured to determine the type of loaded disk.

If it is determined in the step 208 that there is no reflection on the surface of the disk 110, in the control block 102, if the disk does not make one revolution for the type determination after loading of the disk 110; (Step 212), the disk motor 106 and the optical system 108 are driven to rotate the disk 110 by a predetermined 1 / n interval while moving the optical pickup by a predetermined interval in the circumferential direction of the disk ( In step 214), the process returns to the aforementioned step 206 to check the disk surface antireflection at the new part by irradiating the laser again to the new position of the disk 110. Here, n may be set as, for example, 2, 4, 6, 8, or the like (ie, a positive integer except 1). Here, the optical pickup is moved in the circumferential direction of the disc by a predetermined interval so as to set a new irradiation position in order to appropriately cope with the seismic isolation along the same track.

That is, in the present invention, to determine the type of the disk 110, the laser irradiation position of the disk is set to n pieces, and the anti-reflection on the surface of the disk is checked while changing to a new laser irradiation position until the disk 110 is rotated once. It is.

If it is determined in the step 212 that the disc 110 has made one rotation (that is, one rotation by 1 / n rotation) to determine the type, the control block 102 determines the optical system 108. In operation, the current CD LD is changed to the DVD LD, that is, the actuator in the optical system 108 is swinged to set the optical pickup to the DVD CD position (steps 216 and 218). The reason for changing the CD LD to the DVD LD is that the amount of laser reflection on the recording surface is higher than that of the CD LD in order to improve the detection accuracy of the reflection wavelength on the recording surface.

In the present embodiment, the CD LD is first irradiated to check whether there is no reflection on the surface of the disc, and when the surface of the disc is not reflected, the optical pickup is driven to change the CD LD to the DVD LD. It is a matter of course that the steps for changing the LD (steps 216 and 218) can be omitted when using the DVD LD from the beginning.

Thereafter, as in the method described above, the disk 110 is irradiated with a laser again to detect the reflection waveform on the disk recording surface (step 220), and as shown in FIG. Detects the peak value Wp, and compares the detected peak value of the reflected waveform with the DVD reference waveform and the CD reference waveform previously stored in the memory not shown, calculated through average statistics, and loaded based on the comparison result. It is determined whether the disc 110 is a DVD or a CD (step 222). Here, the reflection waveform on the recording surface of the DVD disc has a relatively large peak value compared to the reflection waveform on the recording surface of the CD disc. In the present invention, the type of the disc is determined by using the peak value difference.

Next, in the control block 102, the optical system 108 is driven to set the optical disc reproducing apparatus to the reproducing mode determined according to the peak value detection result of the reflected waveform on the disc recording surface, that is, to the DVD mode or the CD mode. (Step 224).

Meanwhile, in a preferred embodiment of the present invention, when no reflection on the surface of the disc is detected, the disc is rotated by a predetermined 1 / n interval, and the optical pickup is moved by a predetermined interval in the circumferential direction of the disc, thereby resetting the laser to a new position. The primary process of checking the surface of the disk for antireflection during one rotation of the disk by irradiation is to measure the peak value of the detected waveform by again irradiating the DVD LD to the disk when continuous reflection of the disk surface is detected. Although it has been described as determining the type of disk through the secondary process, it is not necessary to perform both processes, and it can be set to discriminate the type of disk by selectively employing only the primary process or the secondary process. to be.

 As described above, according to the present invention, the type of the optical disc is determined by detecting a signal reflected by irradiating a laser onto the optical disc and calculating the distance between the surface and the recording surface of the optical disc based on the detected reflected signal. Unlike the conventional method described above, when the laser is irradiated to the optical disk, the optical disk is rotated by a predetermined interval when there is no reflection from the surface of the disk due to external factors, and the optical pickup is predetermined in the circumferential direction of the disk. The distance between the surface and the recording surface is calculated at different positions of the disk by moving the laser back to a new position on the disk, and the detection waveform on the recording surface of the disk is nevertheless determined when the disc type cannot be determined. Disc type can be determined based on the peak measurement result of Not only can solve the problem, it takes too much time in the reproduction mode due to the failure determination, but also to promote the use of convenient property of the optical disk reproducing device user.

Claims (7)

delete A method for determining the type of a disc loaded in an optical disc reproducing apparatus having a means for rotationally driving a disc and an optical means for irradiating a laser to reproduce data recorded on the disc, A first process of driving the optical means to detect reflected wavelengths on the disc surface and the recording surface when the disc is loaded; A second step of checking whether there is no reflection on the surface of the loaded disk; When the antireflection is checked, the loaded disk is rotated by a predetermined 1 / n interval, and the optical means is moved by a predetermined interval in the circumferential direction of the loaded disk to set a new laser irradiation position, and then A third process of repeating process 1 and process 2, A fourth process of repeating the third process for one revolution of the loaded disc until the reflected wavelength at the surface of the loaded disc is detected; When the reflection wavelengths on the surface and the recording surface on the loaded disc are detected through the above processes, the distance between the reflection wavelength on the surface and the reflection wavelength on the recording surface is measured and based on the measurement result A fifth process of determining whether the loaded disc is a DVD or a CD Disc type determination method of the optical recording medium comprising a. The method of claim 2, And n is a positive integer except 1, wherein the disc type is discriminated. delete delete A method for determining the type of a disc loaded in an optical disc reproducing apparatus having a means for rotationally driving a disc and an optical means for irradiating a laser to reproduce data recorded on the disc, A first process of driving the optical means to detect reflected wavelengths on the disc surface and the recording surface when the disc is loaded; A second step of checking whether there is no reflection on the surface of the loaded disk; When the antireflection is checked, the loaded disk is rotated by a predetermined 1 / n interval, and the optical means is moved by a predetermined interval in the circumferential direction of the loaded disk to set a new laser irradiation position, and then A third process of repeating process 1 and process 2, A fourth process of repeating the third process for one revolution of the loaded disc until the reflected wavelength at the surface of the loaded disc is detected; When the reflection wavelengths on the surface and the recording surface on the loaded disc are detected through the above processes, the distance between the reflection wavelength on the surface and the reflection wavelength on the recording surface is measured and based on the measurement result A fifth process of determining whether the loaded disc is a DVD or a CD; A sixth process of detecting a reflection waveform on the recording surface by irradiating a laser to the loaded disk when the antireflection is detected during one rotation of the loaded disk; A seventh process of measuring the peak value of the measured reflection waveform; An eighth step of determining whether the loaded disc is the DVD or the CD by comparing the measured peak value with a preset DVD and CD reference recording surface waveform; Disc type determination method of the optical recording medium comprising a. The method of claim 6, And n is a positive integer except 1, wherein the disc type is discriminated.

Images