KR100833245B1 - Information storage medium and method of recording on and/or reproducing data from the same - Google Patents

Abstract

Disclosed are an information storage medium and a method for recording and / or reproducing the information storage medium and data.

The disclosed information storage medium is an information storage medium having one or more information planes, in which information is recorded in the protruding pit or the incoming pit in all or part of the information storage medium, and the information relating to the protruding pit or the incoming pit. The information is recorded.

Tracking can be smoothly performed according to the information on the protruding pit and the incoming pit.

Description

Information storage medium and method of recording on and / or reproducing data from the same}

1A and 1B illustrate tracking polarities according to groove tracks and land tracks.

Figure 2a shows an example of the protrusion pit formed on the substrate of the information storage medium according to the present invention.

Figure 2b shows an example of the introduction pit formed on the substrate of the information storage medium according to the present invention.

FIG. 3A is a graph showing changes in DPD and RF signals over time in an information storage medium having data formed with protruding pits.

 3B is a graph showing changes in DPD and RF signals over time in an information storage medium in which data is formed with incoming pits.

4A is a graph illustrating a change in a push-pull signal over time in an information storage medium having data formed as protrusion pits.

4B is a graph illustrating a change of a push-pull signal over time in an information storage medium in which data is formed as an incoming pit.

5 shows an example in which tracking polarity information is recorded in a sink pattern on an information storage medium according to the first embodiment of the present invention.

6A and 6B illustrate an example in which tracking polarity information is recorded in a specific pattern in front of a frame sync or frame sync in an information storage medium according to a first embodiment of the present invention.

7A and 7B show structures of regions of an information storage medium according to a second embodiment of the present invention.

8A is a schematic structure of an information area of a recordable information storage medium.

8B is a schematic structure of an information area of a read-only information storage medium.

FIG. 9A shows a straight pit row, and FIG. 9B shows a wobbling pit row.

10 shows an example in which tracking polarity information is recorded in an information storage medium according to a third embodiment of the present invention.

11A and 11B illustrate a method of decoding by an exclusive logic sum of tracking polarity data and data detected in a data frame in an information storage medium according to a third embodiment of the present invention.

12 is a flowchart showing a method of recording and / or reproducing data according to an embodiment of the present invention.

<Explanation of symbols for main parts of the drawings>

10 ... protrusion feet, 13 ... ingress feet

15 ... data frame

The present invention relates to an optical information storage medium in which tracking polarity information according to a pit shape is recorded and a method of recording and / or reproducing data.

Generally, optical information storage media are classified into compact disks (CDs) and digital versatile disks (DVDs) according to information recording capacities. In addition, a mini disk (MD) having a disk diameter of 65 mm or less may be further added. Furthermore, disks with a capacity of 20GB or more are being developed.

These optical discs can be further subdivided into read-only discs and rewritable discs. Read-only disks include CD-ROM (Read Only Memory) and DVD-ROM, and recordable disks include CD ± R / RW, DVD ± R / RW, and Random Access Memory (DVD-RAM). CD-R and DCD-R can only record once, CD-RW and DVD-RW can record and / or play about 1000 times, and DVD-RAM can record and / or play hundreds of thousands of times. .

Generally, data is recorded as a pit on a read-only disc or a read-only disc, and a phase change material is coated on a rewritable disc so that the data may be changed due to a phase change. Is recorded.

The pickup provided in the recording and / or reproducing apparatus of the optical disc accurately reads the track on which the user data is recorded and receives the laser beam reflected from the track to read the user data. The signal that the pickup uses to follow the track is called the tracking signal. The tracking signal is obtained by the laser beam being received by a photodiode having a plurality of light receiving sections, and then adding or subtracting signals obtained from the light received by each light receiving section. The tracking signal has an S-shaped curve having opposite polarities of right and left with respect to the center.

The polarity of the tracking signal depends on the type of optical disc, i.e., the physical characteristics of the recording layer, for example, the physical shape of the pit, the physical shape of the track, and the like. For example, FIGS. 1A and 1B illustrate the case where the groove tracks G and the land tracks L are formed to be arranged opposite to each other. In FIG. 1A, the tracking signal changes from (+) to (−), whereas in FIG. 1B, the tracking signal changes from (−) to (+). As described above, the polarity of the tracking signal is divided into two types, one of which is changed from (-) to (+), and the other of which is changed from (+) to (-). However, tracking signal processing varies depending on the polarity of the tracking signal. Therefore, the reproduced data may not be recognized normally when the tracking polarities are different. Accordingly, when the optical disc is loaded, the recording and / or reproducing apparatus detects the polarity of the tracking signal through trial and error, and then tracks the track on which the user data is recorded based on the determined polarity information to retrieve the user data. Read.

Therefore, the conventional reproducing apparatus requires a time for obtaining polarity information of the tracking signal prior to reading the user data, which is one of the causes of delay in immediate reproduction of the user data.

One of the factors that changes tracking polarity is the physical shape of the pit. The physical shape of the pit may be different for each disk. In the related art, since tracking polarity information according to the pit physical shape is not separately recorded, reliability of data recording and / or reproduction is inferior. Since it takes a long time to obtain information on the tracking polarity, the recording and / or reproducing time is delayed.

Accordingly, an object of the present invention is to provide an optical information storage medium in which tracking polarity information according to a pit shape and a method of recording and / or reproducing data are provided.

In order to achieve the above object, an information storage medium having one or more layers of information planes, in which information is recorded as a protruding pit or an incoming pit in all or part of the information storage medium, The information is recorded.

The information on the protruding pit or the incoming pit is characterized in that the tracking polarity information.

Information regarding the protruding pit or the incoming pit is recorded in front of the frame sync or the frame sync.

The information storage medium includes a BCA area and a lead-in area, and information about the protruding pit or the incoming pit may be recorded in the BCA or in the lead-in area.

The protruding pit or the incoming pit may be formed as a wobbling pit.

The data is decoded by an exclusive logical sum of the tracking polarity data and the data reproduced from the protruding pits or the incoming pits.

In order to achieve the above object, a method of recording and / or reproducing data according to the present invention is a method of recording and / or reproducing information on an information storage medium having at least one information surface.

Recording the information as protruding pits or retracting pits in all or a portion of the information storage medium; And recording information about the protruding pit or the incoming pit.

The method includes reproducing information about the protruding pit or the incoming pit; And recording data on the information storage medium or reproducing the recorded data by performing tracking based on the reproduced tracking polarity information.

Hereinafter, an optical information storage medium and a method of recording and / or reproducing data according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In the optical information storage medium according to the present invention, data is recorded as the protruding pit 10 on the substrate 5 as shown in FIG. 2A or as the pit 13 as shown in FIG. 2B, and the protruding pit (10) or information about the incoming pit 13 is recorded.

Information about the protruding pit 10 or the incoming pit 13 may be, for example, tracking polarity information.

When data is recorded into the protruding pit 10, the tracking signal may have a polarity that changes from (+) to (−). Also, when data is recorded in the inlet pit 13, the tracking signal may have a polarity that changes from (-) to (+). Since the polarity of the tracking signal is different according to the pit shape, the tracking signal processing must be performed differently so that data can be recorded or reproduced normally.

First, a simulation result is shown to examine tracking signal characteristics. Here, simulation conditions are as follows.

   LD wavelength (λ)       400 nm   Objective numerical aperture       0.85   Groove structure   Track Pitch: 0.32㎛   Mark length       0.149 μm   Mark width       0.15㎛   Modulation method      RLL (1,7)

 In Table 1, the RLL modulation scheme indicates the modulation scheme according to how many 0 bits come between 1 bit and 1 bit, and the RLL (m, k) shows the minimum number of 0 bits between 1 bit and 1 bit ( m) dogs, meaning up to (k) individuals. For example, RLL (1,7) represents a scheme in which the number of 0 bits between 1 bit and 1 bit is 1-7. According to this modulation method, when m = 1, data of 1010101 is recorded, and has a length of 2T between one bit and one bit. Further, when m = 7, data of (10000000100000001) is recorded, and has a length of 8T between one bit and one bit. Here, T represents the minimum mark, that is, the minimum pit length. Thus, in the RLL (1,7) modulation scheme, data is recorded in pits and spaces having a length of (2T-8T).

FIG. 3A illustrates an RF signal and a differential phase diode (DPD) signal when data is recorded into the incoming pit 13, and FIG. 3B illustrates an RF signal and a DPD signal when the data is recorded into the protruding pit 10. It is shown. 3A and 3B, the polarity of the DPD signal does not change depending on the pit shape.

On the other hand, Fig. 4A shows the push-pull signal when data is recorded as the incoming pit 13, and Fig. 4B shows the push-pull signal when the data is recorded as the protruding pit 10. Figs. 4A and 4B, it can be seen that the push-pull signal is polarized according to the pit shape. Therefore, it is necessary to record tracking polarity information according to the pit shape when reproducing information or implementing tracking by a push-pull signal.

Next, a method of recording the tracking polarity information will be described.

As shown in FIG. 5, the optical information storage medium according to the first embodiment of the present invention includes a plurality of data frames 15 and includes a frame sink 13 provided in front of a section including a predetermined number of data frames. Tracking polarity information can be recorded using the sync pattern. The sync pattern may include a pattern not used in the user data pattern or a pattern composed of a combination of specific bits. An example of a sync pattern is shown in FIG. 5.

For example, the sync pattern may indicate tracking polarity information by having a pattern in which the same data is repeatedly recorded. For example, when " 1 " is continuously read, data is recorded as the protruding pit, and when " 0 " is read continuously, it indicates that the data is recorded as the incoming pit.

Alternatively, tracking polarity information may be recorded using a sync pattern of a specific pattern. For example, if data "010" is recorded in the frame sink 13 as shown in FIG. 6A, when the data exhibits a polarity that changes from (+) to (-), "101" after tracking When data is reproduced, the data can be reproduced normally by reversing the polarity of the tracking signal. In FIG. 6A, an example in which tracking polarity information is recorded in the frame sink 13 is illustrated. However, as shown in FIG. 6B, the tracking polarity information may be recorded in a predetermined area 12 in front of the frame sink 13. In this manner, the tracking polarity information may be recorded by using a partial area of the frame sink 13 or may be recorded in a separate area other than the frame sink.

7A is a schematic diagram of an information storage medium according to a second embodiment of the present invention.

The information storage medium includes a clamping area C, a BCA area B, a lead in area LI, a user data area U, and a lead out area LO. The clamping region C refers to the region pressed by the clamping mechanism for clamping the disk.

Here, tracking polarity information may be recorded in the BCA area B. FIG. In addition, in the BCA area B, unique information about the disc, i.e., a serial number, a date of manufacture, etc. may be further recorded, but this is optional. In FIG. 7A, the BCA region B is provided between the clamping region C and the lead-in region LI. However, as shown in FIG. 7B, the BCA region B is disposed in front of the clamping region C. Referring to FIG. It may be provided.

When the tracking polarity information is recorded in the BCA area B, the tracking servo information can be read efficiently before the tracking is performed after the disk is mounted in the drive and focused.

Meanwhile, the tracking polarity information may be recorded in the lead-in area LI instead of the BCA area B. FIG.

8A shows an information area structure of a recordable information storage medium, in which data may be recorded in pits in some areas of the recordable information storage medium, for example, a lead-in area or a lead-out area. Information on this pit shape, that is, tracking polarity information, can be recorded in the lead-in area, and preferably in the disc related information area.

8B illustrates an information area structure of a read-only information storage medium. The tracking polarity information may be recorded in a disc related information area provided in a lead-in area.

When the information is recorded by the pit, for example, the pit is recorded as a straight pit arranged in a line as shown in FIG. 9A or as a wobbling pit in which the pit is arranged in a wave form as shown in FIG. 9B. Can be. When the information is recorded as a straight pit, the information recorded in the pit is reproduced using the thumb channel, while tracking control is possible by DPD or push-pull. In the case of tracking control by push-pull, information about tracking polarity is required.

In particular, when the information is recorded as a wobbling pit, additional information may be recorded in the wobble together with the information recorded in the pit itself. Here, the information by the pit itself may be reproduced using the thumb channel, and the additional information recorded in the wobble may be reproduced using the push-pull channel.

The wobbling pit may have a single pattern of pit and space having the same length. In this single pattern, the pit itself has no information, and information can be recorded in the wobble. At this time, the push-pull channel may be used as the information reproduction channel of the wobbling pit.

When information is recorded by the wobbling pit, data may be recorded by various modulation schemes. For example, at least one of a phase modulation method, a frequency modulation method, and an amplitude modulation method may be adopted to record information.

Next, referring to FIG. 10, the optical information storage medium according to the third exemplary embodiment of the present invention records tracking polarity information before a predetermined data frame, and uses the exclusive logical sum of the data read together with the tracking polarity information. Decode into data. Here, tracking polarity information may be recorded in the frame sync.

For example, a method of decoding using exclusive logic sum when the same information is recorded by the protruding pits and the incoming pits, respectively, will be described. First, when tracking for the protruding pit, for example, the tracking polarity information is read as "0", and the data is read as "11001 ...". Then, when the same information is recorded as the incoming pit, the tracking polarity information for the incoming pit is read out as "1", and the data is read out as "00110 ...". Referring to FIG. 11A, for example, when tracking polarity information is recorded as data "0" for an incoming pit, and data detected in an nth data frame is "11001 ...", tracking polarity data and the data frame The data decoded by the exclusive logical sum of the data from is represented by " 11001 ... ".

Also, referring to Fig. 11B, when the tracking polarity information is recorded as data " 1 " for the protruding pit, and the data detected in the nth data frame is " 00110 ... " The data decoded by the exclusive logic sum of the data is represented by "11001 ...".

By decoding the data by the exclusive logic sum of the tracking polarity data and the data reproduced from the pit as described above, the normal reproduction and restoration of the data is possible regardless of whether it is a projecting pit or an incoming pit. In addition, the decoded data can be obtained without any change in the control operation.

On the other hand, using the tracking polarity information as the selection signal, the read data can be directly output as decoded data, or inverted and output as decoded data. In other words, if the tracking polarity information is determined to be a predetermined pattern and the read tracking polarity information is the same as the predetermined pattern, the data is decoded as it is. If the tracking polarity information is different from the predetermined pattern, the polarity of the data signal is inverted and decoded. .

The information storage medium according to the present invention can be applied not only to the case where the information plane is one layer but also to the multilayer information storage medium having two or more information planes.

12 is a flowchart showing a method of recording and / or reproducing data according to an embodiment of the present invention.

Referring to FIG. 12, when an information storage medium is loaded into a disk drive (step 50), the optical pickup provided in the disk drive reads tracking polarity information (step 55). Here, the tracking polarity information is recorded according to the first to third embodiments described above, and the tracking signal is detected or data is recorded and / or reproduced based on the tracking polarity information.

Since the tracking polarity varies depending on the protruding pit 10 and the incoming pit 13 described with reference to FIGS. 2A and 2B, the tracking signal processing varies according to the tracking polarity information. For example, when tracking polarity information is recorded in the BCA area B, after the information storage medium is loaded into the disc drive, focusing control is performed and the tracking polarity information is read from the BCA area B before the data is read. Therefore, tracking control and information reproduction are made reliably.

The disc drive immediately performs tracking control on the basis of the reproduced tracking polarity information without trial and error to record data in the data area or reproduce data recorded in the data area (step 60). That is, the optical pickup provides the read tracking polarity information to the disk drive, and the disk drive controls the optical pickup based on the provided information to record data on the information storage medium or smoothly reproduce the recorded data.

On the other hand, the data can be decoded by the exclusive logical sum of the tracking polarity data and the data reproduced from the pit. This allows data to be decoded regardless of the tracking polarity.

Alternatively, data reproduced according to the tracking polarity information may be immediately output as decoded data, or inverted and output as decoded data. That is, if the tracking polarity information is determined to be a predetermined pattern and the read tracking polarity information is the same as the predetermined pattern, the data is decoded as it is. If the tracking polarity information is different from the predetermined pattern, the polarity of the data signal is inverted and decoded. .

As described above, according to the information storage medium according to the present invention, by recording the tracking polarity information for the protruding pit and the incoming pit, data can be recorded immediately or reliably and reliably without trial and error for obtaining the tracking polarity information. Can play. In addition, when data is recorded in pits, the shape of the pits can be variously formed into the incoming pits or the protruding pits depending on the manufacturing method.

Claims (9)

A method of recording and / or reproducing information on an information storage medium in which information is recorded in all or a portion of an information storage medium as protruding pits or retracting pits, and information on the protruding pits or retracting pits is recorded. Reproducing information about the protruding pit or the incoming pit; And recording data on the information storage medium or reproducing the recorded data by performing tracking on the basis of the reproduced information. The method of claim 1, And wherein the information regarding the protruding pit or the incoming pit is tracking polarity information. The method according to claim 1 or 2, Information on the protruding pit or retracting pit is recorded in front of a frame sync or frame sync. The method according to claim 1 or 2, And the information storage medium includes a BCA area, and records information about the protruding pit or the incoming pit in the BCA. The method according to claim 1 or 2, And the information storage medium includes a lead-in area, and records information about the protruding pit or the lead-in pit in the lead-in area. The method according to claim 1 or 2, And wherein the protruding pit or the incoming pit is formed of a wobbling pit. The method of claim 6, Information recorded in the wobbling pit is reproduced using a thumb channel, and additional information recorded in the wobble is reproduced using a push-pull channel. The method according to claim 1 or 2, And decoding data by an exclusive logical sum of the information relating to the protruding pits or the incoming pits and the data reproduced from the protruding pits or the incoming pits. The method according to claim 1 or 2, And outputting data reproduced from the protruding pit or the incoming pit as decoded data or inverted decoded data according to the information on the protruding pit or the incoming pit.

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