KR20040019820A - Optical information storage medium and method of recording and/or reproducing the same - Google Patents

Abstract

PURPOSE: An optical information storage medium, and a method for recording and reproducing the same are provided to simplify a manufacturing process, improve recording and reproducing characteristics by forming pits in depth of outputting optimum signals, and maintain the consistency with other kinds of storage mediums. CONSTITUTION: An optical information storage medium includes a lead-in area, a user data area, and a lead-out area. Data are recorded on the lead-in area, the user data area, and the lead-out area in pit. Information data unchangeable to the same physical format are recorded on the whole area or a partial area of the lead-in area. The information data are recorded by a bi-phase modulation method while data of other areas are recorded by an RLL(Run Length Limit) modulation method.

Description

Optical information storage medium and method of recording and / or reproducing the same

The present invention relates to an optical information storage medium and a recording and / or reproducing method thereof, and more particularly, data of all areas are recorded in a pit form, and a recording modulation method of a part of the lead-in area and a recording modulation of the remaining area. The present invention relates to an optical information storage medium having a different method and a recording and / or reproducing method thereof.

In general, an optical information storage medium, for example, an optical disk is widely used as an information storage medium of an optical pickup device that records / reproduces information in a non-contact manner, and may be a compact disk (CD) or a digital multifunction disk according to the information recording capacity. (DVD; digital versitile disk). As an optical disc capable of recording, erasing and reproducing information, 650MB CD-R, CD-RW, 4.7GB DVD + R / RW, random access memory (DVD-RAM), DVD-R / RW (rewritable), etc. Play-only discs include 650MB CD and 4.7GB DVD-ROM. Furthermore, high-density optical discs (HD-DVD) having a recording capacity of 20 GB or more are also being developed.

However, the various types of optical information storage media as described above have standardized specifications for each type of storage media for the convenience of users or economic considerations through compatibility, and standardize the storage media that are not yet defined. Efforts are underway. Therefore, for the standardization, development of the format is required in order to ensure compatibility or consistency with existing storage media. However, a conventional method of recording data in the form of pit or groove wobble has been adopted in the storage medium. Here, the pit refers to a groove formed by physically digging into a substrate during disc manufacture, and the groove wobble refers to a groove formed in a wave shape. In general, the pit signal is detected as a jitter value, while the groove wobble signal is detected as a push-pull signal.

FIG. 1 graphically illustrates the push pull signal and jitter characteristics according to the depth or pit depth of the groove wobble. The depth of the groove wobble at which the push-pull signal is maximum is approximately 1/8 (λ / n), and the pit depth at which the jitter characteristic is best is 1/4 (λ / n). Therefore, in the optical information storage medium in which both the groove wobble and the pit exist, the depth of the groove wobble and the depth of the pit may be different. However, when the depth of the groove wobble and the pit are changed differently, the process of forming the groove wobble and the process of forming the pit must be performed independently. In order to simplify the manufacturing process, the same groove and pit depths are advantageous in terms of the manufacturing process, while in terms of signal characteristics, they do not satisfy either push-pull signal or jitter characteristics. There is a problem of this deterioration.

SUMMARY OF THE INVENTION The present invention has been made in view of the problems posed above, and provides an optical information storage medium that simplifies the manufacturing process and is advantageous in terms of signal and maintains consistency with other types of optical storage media. There is a purpose.

1 is a graph illustrating changes in push-pull signal and jitter characteristics according to groove wobble or pit depth.

2 is a view schematically showing a physical structure of a recordable high density optical information storage medium as a related art of the present invention.

3 illustrates a write modulation method of a groove wobble.

4 is a view schematically showing a physical structure of an optical information storage medium according to the present invention.

5 is a diagram schematically showing a data structure of an optical information storage medium according to the present invention.

6A and 6B show an example of a recording pattern of an optical information storage medium according to the first embodiment of the present invention.

7A and 7B illustrate an example in which an address mark is further recorded in a recording pattern of an optical information storage medium according to the first embodiment of the present invention.

<Description of Symbols for Major Parts of Drawings>

8,18,20,22 ... ft, 10 ... lead-in area

13 ... User data area, 15 ... Leadout area

24 ... space

In order to achieve the above object, the optical information storage medium according to the present invention is an optical information storage medium having a lead-in area, a user data area and a lead-out area,

Data is recorded in pits in the lead-in area, the user data area, and the lead-out area, and information data that is not changed for the same physical format is recorded in all or part of the lead-in area, and recording of data in this area. The modulation method is different from the modulation method for recording data of the remaining area.

An area in which information which is not changed according to the same physical format is recorded may be an area in which information related to an optical information storage medium is recorded.

It is preferable that the recording modulation scheme of the information which does not change according to the same physical format is a biface scheme, and the recording modulation scheme of the remaining data is an RLL modulation scheme.

The RLL modulation scheme is preferably RLL (1,7) or RLL (2,10).

The sync pattern used for the RLL (1,7) modulation scheme includes at least one pit and space having a length of 9T or more.

The information recorded by the bi-face modulation method is recorded in the marks and spaces of nT and 2nT, and 2≤n≤4.

The optical information storage medium preferably includes a mark having a length of at least 9T and a recognition mark recorded in a pattern in which a space is repeated at least once.

The sync pattern used in the RLL modulation scheme may include at least one pit and a space having a length of 12T or more.

The information used for the bi-face modulation consists of a mark and a space of nT and 2nT, and may be in the range of 3 ≦ n ≦ 5.

Preferably, the sync pattern used for the bi-phase modulation includes at least one pit and a space having a length of 12T or more.

In order to achieve the above object, a recording and / or reproducing method of an optical information storage medium according to the present invention is directed to a method of recording and / or reproducing an optical information storage medium having a lead-in area, a user data area and a lead-out area. In

Writing data in pits into the lead-in area, the user data area, and the lead-out area; Recording information which is not changed for the same physical format in all or part of the lead-in area, and recording data of the remaining area in a modulation method different from a recording modulation method of information which is not changed for the same physical format; It characterized by including.

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

The overall structure of a recordable high density optical information storage medium as the related art of the present invention is shown in FIG. A related invention is disclosed in patent 2001-023747 filed by the applicant. The recordable optical information storage medium includes a lead-in area 110, a user data area 120 and a lead-out area 130, and constitutes an entire storage medium area with grooves 123 and lands 125. . In this case, the user data may be recorded only in the groove 123 or may be recorded in both the groove 123 and the land 125.

On the other hand, when recording read-only data in the lead-in area 110, a wave-shaped wobble signal 105, which is a signal of a specific frequency, on the sidewall of the groove 123 and / or the land 125 track instead of the pit ( 106) are recorded continuously. Here, the beam L records or reproduces data along the groove 123 and / or the land 125 track. In particular, the lead-in area 110 and the lead-out area 130 are provided with a read only area and a recordable area where disc related information is recorded. The disc-related information is recorded in the high frequency wobble 105, and the recordable area and the user data area 120 of the lead-in area 110 and the lead-out area 130 are relative to the high frequency wobble 105. It consists of a low frequency wobble (106). Reference numeral 127 denotes a recording mark formed in the user data area 120.

In the recordable optical information storage medium having such a structure, the read-only data of the lead-in area 110 can be reproduced using the push-pull channel, and the user data can be reproduced using the thumb channel. In addition, a bi-phase modulation method is adopted as the recording modulation method of the data recorded in the lead-in area, and a run length limit (RLL) modulation method, which will be described later, is adopted as the recording modulation method of the user data. According to the bi-phase modulation method, data is displayed depending on whether or not there is a signal change within a certain period. For example, as illustrated in FIG. 3, 0 (or 1) bits are shown when the phase of the groove wobble does not change within a predetermined period P, and 1 (or 0) bits when the phase of the groove wobble is changed. As described above, a method of recording data according to whether there is a predetermined signal change or a change in phase within a predetermined period is called a bi-face method. Although the phase modulation of the groove wobble has been described here, various patterns of phase modulation are possible.

In consideration of the consistency of the recording modulation scheme with the recordable optical information storage medium as described above, the physical data structure of the read-only optical information storage medium according to the present invention can be configured as follows.

Referring to FIG. 4, an optical information storage medium according to an exemplary embodiment of the present invention may include a data area 13 in which user data is recorded, a lead-in area 10 and a data area provided inside the data area 13. A lead-out area 15 provided at an outer side of 13, and data written in the lead-in area 13, the data area 13, and the lead-out area 15 is in the form of pits 8 and 18. FIG. Is recorded. Pits are preformed in the substrate in the manufacture of the optical information storage medium. In this way, if the data recorded in the entire area of the optical information storage medium is recorded in the pit, the pit can be formed in the lead-in area 10 and the user data area 13 without interrupting the process, thereby simplifying the manufacturing process and the process time. Can be reduced. In addition, since there is no groove wobble, the optimum depth to the pit can be determined uniformly. That is, referring to FIG. 1, pits are formed at a depth, for example, 1/4 (n / λ), at which the jitter characteristic is lowest.

In particular, as shown in FIG. 5, for example, information that does not change in all or part of the lead-in area 10 with respect to the same physical format (format for modulation method, minimum pit length, track pitch, etc.) The storage medium related information is recorded. In contrast, information changing according to the contents of the storage medium, for example, information such as the last address of a portion where data is recorded in the user data area may be recorded in the remaining areas except the partial area 10a.

Here, it is preferable to record data in the form of a pit in all areas of the storage medium, but to change the data recording modulation scheme in all or part of the lead-in area 10 from the remaining areas 10a. For example, a biface modulation method is adopted as a data recording modulation method recorded in all or a part of the lead-in area 10 or a portion 10a, and an RLL modulation method is adopted as a data recording modulation method of the remaining areas. can do. Hereinafter, the partial region will be referred to as a storage medium related information region.

According to the optical information storage medium and the recording and / or reproducing method thereof according to the first embodiment of the present invention, data is recorded in the form of a pit in all areas of the storage medium and the entire information of the lead-in area or the storage medium related information area 10a is provided. The data is recorded by the bi-face modulation method and the remaining areas by the RLL (1,7) modulation method.

In the bi-phase method, as shown in FIG. 6A, 0 (or 1) bits are used when there is no change in pit within a predetermined period P, and 1 (or 0) bits when there is a change in pit. Represent each. In other words, when the entire period P is formed of the pit 20, 0 (or 1) bits are represented, and when the pit 22 and the space 24 are mixed, 1 (or 0) bits are represented. 6A shows a biface modulated pit, a binarized signal, a biface data pattern, and a data structure.

On the other hand, the RLL modulation method indicates a modulation method according to how many 0 bits come between 1 bit and 1 bit, and the RLL (d, k) has a minimum number of 0 bits between 1 bit and 1 bit (d ) And up to (k). For example, RLL (1,7) represents a method in which there are at least one and a maximum of seven bits, ranging from seven to seven, between 1 and 1 bit. According to this modulation method, when d = 1, the data of 1010101 is recorded and has a length of 2T between one bit and one bit. Further, when d = 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).

At this time, the data recorded by the bi-face modulation method is composed of pits and spaces of nT and 2nT, and n is preferably in a range of 2 ≦ n ≦ 4. For example, when n = 2, the data of the biface modulation method is composed of 2T and 4T pit and space, and when n = 4, the data of the biface modulation method is 4T and 8T pit and space. Is made of. Therefore, when n is in the range of 2 ≦ n ≦ 4, data consisting of pits and spaces of nT and 2nT are all included in the pits and space length ranges by the RLL (1,7) modulation scheme. When reproducing from the pit and the space as described above, it can be recognized as 1 (or 0) if there is a change in the pit and space within a 2nT period, and 0 (or 1) if there is no change.

Meanwhile, the sync pattern may be recorded in front of the region in which the bi-phase modulation scheme is used and the region in which the RLL modulation scheme is used. The sync pattern preferably includes at least one pit and space having a length outside the longest pit or space length range used in the RLL modulation scheme.

For example, when the RLL (1,7) modulation scheme is adopted in the user data area, at least one pit and mark having a length of 9T or more may be included, and the pit and space having a length of 9T or less may be configured together. . In the RLL (1-7) modulation scheme, at least one pit and space has a length range of (3T-8T) and the sync pattern has a length outside the range of (3T-8T) which is the length range of the data. It is desirable to have. For example, it is preferable to include 9T at least once and be configured with a pit and a space having a length of 9T or less.

In addition, it is preferable that the sync pattern used in the bi-phase modulation method includes the longest pit or space included in the sync pattern used in the RLL modulation method.

In this manner, the period of the pit and space by the bi-phase modulation method is used within the period of the period of the pit and space used by the RLL modulation method, and the sync pattern used by the bi-phase modulation method is the sync pattern used by the RLL modulation method. By including the longest pit or space included in the same, the same PLL (Phase Locked Loop) circuit can be used for both the reproduction-only data pits of the partial region 10a of the lead-in area and the data pits of the user area 13. It has the advantage of being renewable.

In an example in which data is configured in the above-described manner, the sync pattern may include 9T at least once, and may be configured together with a pit and a space having a length of 9T or less. If the user data information is expressed in 3T and 6T pit and space, 0T (or 1) bit when there is no signal change in 6T and 6 (1) bit when there is no signal change in 6T as a reference period. It can be represented. If there is no change in the signal, it is composed of 3T feet and 3T space.

Here, the reference period may be changed to 4T or 8T in addition to 6T according to the reliability or characteristics of the reproduced data. In this case, data information is represented by 2T and 4T feet and space, 4T and 8T feet and space instead of 3T and 6T feet or space. However, especially when 9T is included in the sync pattern and data information is recorded using 3T and 6T with 6T as a reference period, there is an advantage that the reproduction error rate of the data can be lowered. Even if the data is reproduced in 2T or 4T, it is corrected by 3T neighboring it, and when it is reproduced in 5T or 7T, it is corrected by 6T neighboring it, and when it is reproduced in 8T or 10T, it is corrected by 9T. have. Although not shown in the drawing, the sync pattern may be recorded in the user data area 13 as described above.

6B shows an example of a data structure modulated in a bi-face manner and shows a case in which polarities are reversed as compared to FIG. 6A.

Furthermore, as shown in FIG. 7A, recognition marks are recorded at the head and the tail of the area 10a so as to know the area 10a in which the information is stored in the bi-face modulation method as distinguished from the user data area as described above. can do. The recognition mark may also be configured to repeat at least one or more times the same length of a pit or space as the longest pit or space in the sync pattern used for the RRL (1,7) modulation method and the bi-face modulation method.

FIG. 7B illustrates a case in which polarities are reversed as compared to FIG. 7A.

Next, an optical information storage medium and a recording and / or reproducing method thereof according to a second embodiment of the present invention will be described.

According to the second embodiment, data is written in pits over the lead-in area 10, the user data area 13, and the lead-out area 15, and all or part of the lead-in area 10 10a. ) Records data by the bi-phase modulation method, and the remaining areas by the RLL (2, 10) modulation method. The partial area 10a is an area in which information that does not change with respect to the same physical format is recorded, and the remaining area represents the remaining area of the lead-in area 10, the user data area 13, and the lead-out area. Information that does not change for the same physical format is, for example, storage medium related information.

According to the RLL (2,10) modulation scheme, data is recorded in marks having a length in the range of (3T-11T), that is, pits and spaces. At this time, the data recorded in the bi-face method is composed of a mark and a space having a length of nT and 2nT, and n preferably has a range of 3 ≦ n ≦ 5. That is, when n = 3, the data by the bi-face method is composed of marks and spaces having lengths of 3T and 6T, and pits and spaces having lengths of 5T and 10T when n = 5. Since the length of the pit and space in the bi-face method is included in the range of (3T-11T) which is the length range of the user data employing the RLL (2,10) method, as described above, Data in the lead-in area can be reproduced using the same PLL circuit.

Meanwhile, the sync pattern may be recorded in front of the region where the bi-face modulation scheme is used and the region where the RLL (2,10) modulation scheme is used. The sync pattern is preferably configured with a pit and a space having a length of 12T or more repeated at least once and having a pit and a space having a length smaller than 12T. For example, the sync pattern may include a pit and a space having a length of 12T at least once, and the user data information may be configured based on any one of 2nT, that is, 6T, 8T, and 10T.

For example, when 8T is used as a reference period, 0 (or 1) bits are shown when there is no signal change within 8T, and 1 (or 0) bits when there is a signal change. The case where there is no signal change means that the entire 8T is pit or space, and the case where there is signal change means a case where 4T pit and 4T space are configured within 8T.

In addition, it is preferable to further record the recognition marks at the head and tail of the area in order to recognize the area using bi-face modulation separately from the RLL (2,10) modulation method used for storing user information. Here, the recognition mark may be composed of a pit and a space having a pit having a length of 12T or more and being repeated at least once or more, and having a pit and a space having a length of less than 12T.

The optical information storage medium according to the present invention can be applied to a storage medium having one or more information planes.

As described above, the optical information storage medium and the recording and / or reproducing method according to the present invention simplify the manufacturing process by uniformly forming the pit over the entire storage medium, and reduce the pit to the depth at which the signal is optimal. Since it can be formed, it is advantageous to improve recording / reproducing characteristics. That is, since the same reproduction channel (thumb channel) by pit is used, it is not necessary to consider the difference in signal characteristics by groove or pit.

In addition, by matching the data recording modulation method of the partial area of the lead-in area and the data recording modulation method of the user data area with the recording modulation method of the recordable optical information storage medium, consistency with other types of storage media can be maintained. Furthermore, according to the present invention, a larger amount of data can be recorded than that of the conventional groove wobble, and there is an advantage in that reproduction-only data and user data in the lead-in area can be reproduced using the same PLL circuit. In addition, the drive access time can be reduced by recording the recognition mark to improve the detection capability of the specific area.

Claims (30)

In an optical information storage medium having a lead-in area, a user data area and a lead-out area, Data is recorded in pits in the lead-in area, the user data area, and the lead-out area, and information data that is not changed for the same physical format is recorded in all or part of the lead-in area, and recording of data in this area. An optical information storage medium, characterized in that the modulation method and the modulation method for recording data of the remaining area is different. The method of claim 1, And an area in which information which is not changed according to the same physical format is recorded is an area in which information related to the optical information storage medium is recorded. The method according to claim 1 or 2, And a recording modulation scheme for information that does not change according to the same physical format is a bi-face scheme, and a recording modulation scheme for the remaining data is an RLL modulation scheme. The method of claim 3, The RLL modulation scheme is an optical information storage medium, characterized in that the RLL (1,7). The method of claim 4, wherein And at least one pit and a space having a length of at least 9T for the sync pattern used in the RLL (1,7) modulation scheme. The method of claim 3, And the information recorded by the bi-face modulation method is recorded with a mark and a space of nT and 2nT, and 2≤n≤4. The method of claim 6, And at least one pit and a space having a length of 9T or more. The method according to any one of claims 4 to 7, An optical information storage medium comprising a mark having a length of at least 9T and a recognition mark recorded in a pattern in which a space is repeated at least once. The method of claim 3, The RLL modulation method is an optical information storage medium, characterized in that the RLL (2, 10). The method of claim 9, And at least one pit and a space having a length of at least 12T for the sync pattern used in the RLL modulation scheme. The method according to claim 9 or 10, And information used for the bi-face modulation is made of a mark and a space of nT and 2nT, and 3≤n≤5. The method of claim 11, And at least one pit and a space having a length of 12T or more. The method according to claim 9, 10 or 12, An optical information storage medium comprising a mark having a length of 12T or more and a recognition mark recorded in a pattern in which a space is repeated at least once. The method of claim 11, An optical information storage medium comprising a mark having a length of 12T or more and a recognition mark recorded in a pattern in which a space is repeated at least once. The method according to claim 1 or 2, An optical information storage medium having one or more layers of information. A method of recording and / or playing back an optical information storage medium having a lead-in area, a user data area and a lead-out area, Writing data to the lead-in area, the user data area, and the lead-out area in feet; Recording information which is not changed for the same physical format in all or part of the lead-in area, and recording data of the remaining area in a modulation method different from a recording modulation method of information which is not changed for the same physical format; Method comprising a. The method of claim 16, And an area in which information which is not changed according to the same physical format is recorded is an optical information storage medium related information area. The method according to claim 16 or 17, The write modulation scheme of the information which does not change according to the same physical format is a bi-face scheme, and the write modulation scheme of the remaining data is an RLL modulation scheme. The method of claim 18, The RLL modulation scheme is RLL (1,7). The method of claim 19, And wherein the sync pattern in which the RLL modulation scheme is used comprises at least one pit and space having a length of at least 9T. The method of claim 19 or 20, And the information recorded by the bi-face modulation method is recorded with a mark and a space of nT and 2nT, and 2≤n≤4. The method of claim 21, And wherein the sync pattern used in the bi-phase modulation scheme comprises at least one pit and space having a length of at least 9T. The method of claim 19 or 20, And a mark having a length of 9T or more and a recognition mark recorded in a pattern in which the space is repeated at least once. The method of claim 18, The RLL modulation scheme is RLL (2,10). The method of claim 24, And the sync pattern used in the RLL modulation scheme comprises at least one pit and space having a length of at least 12T. The method of claim 24 or 25, And the information used for the bi-face modulation is made of a mark and a space of nT and 2nT, and 3≤n≤5. The method of claim 26, And the sync pattern used for the bi-phase modulation is recorded in a pattern in which a mark and a space having a length of 12T or more are repeated at least once. The method of claim 24 or 25, And a mark having a length of at least 12T and a recognition mark recorded in a pattern in which the space is repeated at least once. The method of claim 18, The pit or space length used in the bi-phase modulation scheme is included in the pit or space length range used in the RLL modulation scheme. The method of claim 3, The pit or space length used in the bi-face modulation method is included in the pit or space length range used in the RLL modulation method.