KR20090113632A - Recognition method of optical disk - Google Patents

Abstract

PURPOSE: A recognition method of an optical disk for increasing the accuracy of determination and reducing a determination process of the disk are provided to improve the accuracy of determination and reduce a determination process of the optical disk. CONSTITUTION: A read-in area within an inserted optical disk is read out(S200). The information of a burst cutting area within the optical disk is read out(S225). A storage medium type is determined in comparison with information of BCA and read-in area information(S245). The read-in information is stored.

Description

Recognition method of optical disk

The present invention relates to a method for recognizing an optical disc, and more particularly, to an optical disc recognizing method capable of determining the type of a disc by first reading a lead-in area of the optical disc.

With the advent of the multimedia era, which covers video signals, audio signals, and computer data information including moving and still images, various discs including compact discs (CDs) and digital versatile discs (DVDs); The same package media has already been widely used, and in recent years, attempts have been actively made to apply optical discs as recording media for mobile phones, digital cameras, broadcasting and movies.

However, the DVD having the largest recording capacity among optical discs can record only up to 4.7 GBytes, which is not suitable for recording two hours of moving picture information.

Recently, high-definition HD digital broadcasting has been developed around the world, and a recording and reproducing device for Blu-ray Disc (BD), which has become a very small concern, has been developed.

The Blu-ray Disc (BD), which can record up to 27GB (GB) using this short wavelength blue laser, can record much higher-quality video information than a DVD with a maximum storage capacity of 4.7GB.

Optical discs are largely read-only-memory (ROM), recordable (R) capable of recording information only once, and repeatable (Rewritable; rewritable). RE) There is a disk.

In general, for obtaining information of most optical disks, the optical disk reproducing apparatus irradiates a laser to obtain information by using a change in reflectivity of data recorded on the optical disk.

Most optical disc reproducing apparatuses include a burst cutting area (BCA), a lead-in area, and data from the inner circumference to the outer circumference of the optical disc when reading and playing the optical disc. The information is read in the order of the area and the lead-out area.

In the BCA, a code is inserted by applying a laser to a reflective layer or a recording layer positioned on a cover layer of an optical disk. In the BCA code, unique disc information and copy protection code are recorded.

However, when there is no BCA code information of the above-described optical disc or the BCA code is not recorded at the time of optical disc production, when the optical disc is recognized, the optical disc is read in the order of BCA and lead-in area. The accuracy of the storage medium type of the optical disc is lowered, thereby increasing the time required for the recognition process.

Accordingly, an object of the present invention is to provide a method for recognizing an optical disc, which can reduce the determination process of the optical disc and improve the accuracy of the determination by first reading the information of the lead-in area in the optical disc recognition method. Is in the offering.

According to an aspect of the present invention, there is provided a method of recognizing an optical disk, the method including: reading information of a lead-in area in an inserted optical disk, and information of a burst cutting area (BCA) in the optical disk; The method may further include reading the data and determining the storage medium type by comparing the information of the lead-in area with the information of the BCA.

The optical disc recognition method according to the present invention includes a lead-in among a burst cutting area (BCA), a lead-in area, a data area, and a lead-out area in the optical disc recognition method. By reading the information of the (Lead-in) area first, it is possible to provide a method of recognizing an optical disc that reduces the discrimination process and improves the accuracy of the discriminant.

Hereinafter, with reference to the drawings will be described the present invention in more detail.

1 is a block diagram showing the configuration of an optical disk recording / reproducing apparatus according to the present invention.

Referring to FIG. 1, the optical disc recording / reproducing apparatus may include a recording / reproducing unit 10 for recording data on the optical disc 100 or reproducing the recorded data, and a control unit 12 controlling the same.

The recording / reproducing section 10 receives the signals read out from the pickup section 11 and the pickup section 11 which directly records data on the optical disc 100 or reads the recorded data, and restores the desired signal values. A signal processor 13 for modulating and transmitting a signal to be removed or recorded into a signal recorded on the optical disc 100, and a pickup 11 for accurately reading or recording a signal from the optical disc 100; Servo 14 for controlling the, the memory 15 for temporarily storing the management information and data, and the microcomputer 16 for controlling the above-described components are basically configured.

The recording and reproducing unit 10 functions to record on a recording medium, and a recording device composed only of the recording and reproducing unit 10 may be referred to as a “drive” and may be used as a computer peripheral device.

The control unit 12 is responsible for the control of the above-described components, in particular, in relation to the present invention, recording and reproducing for recording or reproducing data on an optical disc with reference to a user command or the like through an interface with a user. The command is transmitted to the recording and playback section 10.

The decoder 17 may decode a signal read from the optical disc 100 under the control of the controller 12, restore the signal to desired information, and provide the same to a user.

The encoder 18 converts an input signal into a signal of a specific format, for example, an MPEG 2 transport stream, under the control of the control unit 12 to perform a function of recording a signal on the optical disc 100. To the signal processor 13.

The optical disc 100 is largely read-only-memory (ROM), recordable (R) capable of recording information only once, and repeatable recording type capable of repeatedly writing, reading, and erasing information. (Rewritable; RE) There is a disk.

As described above, the optical disc 100, the recording and playback section 10, and the decoder 17 may be used in connection with the reproduction, and in connection with the recording, the optical disc 100, the recording and playback section 10, and the encoder ( 18 may be used under the control of the controller 12.

FIG. 2 is a diagram illustrating a configuration of the pickup unit of FIG. 1.

Referring to FIG. 2, the pickup unit 11 includes a light source 20, a collimator lens 25, a beam splitter 30, a diffraction grating 40, and a quarter wave plate QWP. : Quarter Wave Plate (60), the objective lens 70, the sensor (Sensor) lens 80 and the light detecting means 90 may be included. The optical disk 100 is mounted on the side where the objective lens 70 is focused.

The light source 20 emits a laser beam, and the collimator lens 25 converts the beam emitted from the light source into parallel light.

The beam splitter 30, which is an optical splitter, transmits the incident beam from the collimator lens 25 to the diffraction grating 40 according to the polarization direction of the incident beam, and transmits the beam reflected from the optical disk 100 to the sensor lens 70. B).

The quarter wave plate 60 for rotating the polarization of the beam is a circularly polarized beam emitted from the light source 20, for example, a p-polarized beam in which an electric field is formed horizontally in the traveling direction of light. And converts the beam reflected by the other circularly polarized light in the optical disk 100 into another linearly polarized beam, for example, a beam of s-polarized light in which an electric field is formed perpendicular to the direction of travel of the light.

The beam focused on the optical disc 100 through the objective lens 70 is reflected and diffracted by the optical disc 100 having a land / groove structure to become a zeroth order beam and a + 1st order beam, and thus the objective lens 70. You will be directed to.

The beam of circularly polarized light reflected by the optical disk 100 is converted into a parallel beam through the objective lens 70 and is converted into linearly polarized light while passing through the quarter wave plate 60.

The sensor lens 80 reflects from the optical disk 100 and generates a boiling point for the incident beam as the path is changed in the beam splitter 30 and transmits the boiling point to the light detecting means 90.

The diffraction grating 40 includes a light detection means 90 in which a circular pattern region of the primary beam and a circular pattern of the 0th order beam overlap in the circular pattern of the diffraction beams generated while being reflected and branched on the optical disk 100. The lattice pattern is formed so as not to be received by the PD cell for the sub beam of.

That is, the beam reflected and branched from the optical disk 100 becomes the main beam and the sub beam through the diffraction grating 40. The main beam passing through the diffraction grating 40 as it is is the light detecting means 90, that is, the light receiving. The two sub-beams, which are received by the main cell of the device and become a main push-pull (MPP) signal, are generated by diffraction by a pattern of a predetermined shape in the diffraction grating 40. The light is received by the subcell to become a first SPP (Side Push-Pull 1) signal and a second SPP (Side Push-Pull 1) signal.

 In order to detect the MPP signal and the SPP signal, the main cell of the light detecting means 90 is divided into at least two parts in a direction corresponding to the radial direction and the tangential direction, and the subcells of the light detecting means 90 are At least two divisions are made in a direction corresponding to the radial direction.

3 is a plan view showing the structure of an optical disk according to the present invention.

Referring to FIG. 3, the optical disc 100 may be a recordable Blu-ray disc or a playback-only Blu-ray disc, but is not limited thereto. That is, optical discs such as DVDs may also fall within the scope of the present invention.

When proceeding from the clamping hole on the innermost inner circumferential surface of the optical disk 100 to the outer circumferential surface, looking at each region, the clamping area (not shown), the burst cutting area (BCA, 125, a lead-in area 110, a data area 105, and a lead-out area 102 may exist.

Further, the lead-in area 110 may include a first guard area and a permanent information & control data (PIC) area, a second guard area and an information 2 area, and the like. The OPC (Optimum Power Control) area and the like are separately allocated.

The first guard area and the PIC area in the lead-in area 110 may be areas in which data is previously recorded.

The PIC area is the area where the main information of the disc to be permanently stored is stored. A high frequency modulated (HFM) groove is formed, and the HFM groove is formed by a bi-phase modulated method. It is modulated to store disc information (DI).

The second Guard 2, Info 2, and OPC (Optimum Power Control) areas in the lead-in area 110 may be rewritable areas where new data is rewritten.

The data area 105 may be located between 22.0 (+0.2, -0.0) mm and 60 mm starting from the inner circumferential surface of the optical disc 100, and the data area 105 and the lead-out area 102 may be Rewritable area where data is rewritten.

4 is a plan view illustrating a burst cutting region of the optical disk of FIG. 3.

Referring to FIG. 4, when the optical disc 100 is inserted and seated in the optical disc reproducing apparatus, it is the innermost peripheral area that is accessed first.

The burst cutting region 125 may be located between 21.3 (+0.0, -0.3) mm and 22.0 (+0.2, -0.0) mm starting from the inner circumferential surface of the optical disc 100.

As shown, the portion in the form of a barcode is a BCA code, and the area where the BCA codes exist is called a burst cutting area 125.

The BCA area 125 includes various optical discs such as a serial number of the optical disc 100 or encryption information for copy protection of the optical disc 100, that is, copy protection information (CPI). The main information DII of 100 is included and recorded.

5 is a flowchart illustrating a method of recognizing an optical disk according to an embodiment of the present invention.

Referring to FIG. 5, in the method of recognizing an optical disc 100 according to the present invention, the standard of the inserted optical disc 100 is checked and the information of the lead-in area 110 of the optical disc is read. (S205).

The lead-in area 110 is divided into a first guard (P1) area and a PIC area, and a second guard (Guard 2) area, an information 2 (Info 2) area, and an OPC (Optimum Power Control) area. .

The information stored in the lead-in area 110 may include first media type information including a BCA flag for confirming the existence of the burst cutting area 125 and information on a storage medium type.

After reading the information of the lead-in area 110, the memory 15 included in the optical disc recording / reproducing apparatus of FIG. 1 described above includes a BCA (Burst Cutting Area) flag read from the lead-in area 110; The first media type information is stored (S210).

The first media type information may include information of a first type storage medium, a second type storage medium, or a third type storage medium.

The first type storage medium is a read-only-memory (ROM) disc, the second type storage medium is a recordable (R) disc capable of recording information only once, and the third type storage medium. Can include a Rewritable (RE) disc that can repeatedly write, read, and erase information.

The presence or absence of the BCA flag is checked from the BCA flag read out from the lead-in area 110 and the first media type information (S215).

BCA flag Good media BAD Media Type 1 storage media 00 01 Second type storage media 10 11 Type 3 storage media 10 11

Table 1 is a table showing correct media and incorrect media depending on the presence or absence of a BCA flag.

In a storage medium of a second type storage medium (Recordable; R) or a third type storage medium (Rewritable; RE) type, the BCA 125 must exist indispensably. Will be determined.

However, in the case of the first type of storage medium (Read-Only-Memory (ROM)), the presence or absence of the BCA is not essential because the disc is a read-only disc. It will be judged whether or not.

If the BCA flag does not exist, that is, if the value of the BCA flag is 0, the inserted storage medium is determined as a first type of storage medium (Read-Only-Memory; ROM) (S220), and the recognition process of the storage medium. Ends.

When the BCA flag is present, that is, when the value of the BCA flag is 1, the inserted storage medium is determined as the first type storage medium R or the second type storage medium RE, and the burst is determined to determine this. In operation S225, the second media type information of the cutting area 125 is read.

As described above with reference to FIG. 3, the BCA area 125 includes a serial number of an optical disc, or encryption information for copy protection of an optical disc, that is, copy protection information (CPI) and media type information. The main information DII of various optical discs such as and the like is recorded.

The second media type information included in the burst cutting area 125 and recorded is the first type storage medium, the second type storage medium, or the third type storage medium similar to the first media type information of the lead-in area 110 described above. Information may include

The second media type information read out from the burst cutting area 125 is stored in the memory 15 included in the above-described reproduction / recording apparatus of the optical disk of FIG. 1 (S230).

When the second media type information is stored in the memory 15, the first media type information read in the lead-in area and the second media type information read in the BCA area are compared (S235).

As a result of comparing the first media type information and the second media type information, if the first and second media type information are not the same, it is determined that the media is wrong (S240), and the recognition process of the storage medium is terminated.

As a result of the comparison between the first media type information and the second media type information, when the first and second media type information match, the type of the inserted storage medium is determined (S245).

For example, when the information of the second type storage medium is included in the first media type information stored in the memory 15 and the information of the second type storage medium is included in the second media type information, It is determined that the first media type information and the second media type match, the type of the storage medium is determined as a second type storage medium (R) and the recognition process of the optical disc according to the present invention is terminated. Each function is performed according to the storage medium.

On the contrary, when the information of the second type storage medium is included in the first media type information and the information of the third type storage medium is included in the second media type information, the first media type information and the second media type. Since the information does not match, it is determined that the storage medium is incorrect and the recognition process of the optical disc according to the present invention is terminated.

Generally, in the recognition process of the recording / reproducing apparatus of the optical disc 100, instead of first reading the burst cutting area 125 to confirm the media type information, the lead-in area 110 is read first to obtain the BCA. By checking and determining the presence or absence of a flag and storing it in a memory to determine whether the readout stage of the burst cutting area 125 proceeds, the recognition process of the optical disc 100 can be reduced, and the accuracy of the storage medium determination can be reduced. Can be improved.

In addition, although the preferred embodiment of the present invention has been shown and described above, the present invention is not limited to the specific embodiments described above, but the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Of course, various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

1 is a block diagram showing a configuration of an optical disk recording / reproducing apparatus according to the present invention;

2 is a view showing the configuration of the pickup portion of FIG.

3 is a plan view showing the structure of an optical disk according to the present invention;

4 is a plan view showing a burst cutting region of the optical disk of FIG.

5 is a flowchart illustrating a method of recognizing an optical disk according to an embodiment of the present invention.

<Explanation of symbols on main parts of the drawings>

100: optical disc 102: lead-out area

105: data area 110: lead-in area

125: burst cutting area

Claims (13)

Reading information of the lead-in area in the inserted optical disc; Reading information of a burst cutting area (BCA) in the optical disk; And And determining a storage medium type by comparing the information of the lead-in area with the information of the BCA. The method of claim 1, And storing the information of the lead-in area. The method of claim 2, The information of the lead-in area includes a BCA flag indicating the presence or absence of the BCA and first media type information. The method of claim 3, The first media type information is a first type storage medium that is a read-only-memory (ROM) disk, a second type storage medium that is a recordable (R) disk capable of recording information only once. And a third type storage medium, which is a rewritable (RE) disc capable of repeatedly writing, reading, and erasing information. The method of claim 3, Checking the presence or absence of the BCA flag. The method of claim 5, If the BCA flag does not exist, Determining the storage medium as a first type storage medium. The method of claim 5, If the BCA flag is present, Determining the storage medium as at least one of a second and a third type storage medium. The method of claim 1, And storing the information of the BCA. The method of claim 1, And the BCA information includes second media type information. The method of claim 9, The second media type information is a first type storage medium that is a read-only-memory (ROM) disk, a second type storage medium that is a recordable (R) disk that can record information only once. And a third type storage medium which is a rewritable (RE) disc capable of repeatedly writing, reading, and erasing information. The method of claim 1, Comparing the information of the lead-in area and the information of the BCA, And recognizing the first media type information and the second media type information. The method of claim 11, And, if the first media type information and the second media type information are different from each other, determine that the storage medium is an incorrect storage medium. The method of claim 8, And determining, when the first media type information and the second media type information are the same, at least one of the second and third type storage media.

Images