KR20050019650A - Small size optical disc - Google Patents

Abstract

PURPOSE: A small sized optical disc is provided to reliably record or regenerate all needed data though a size of a data storage medium gets smaller. CONSTITUTION: The disc comprises at least one data recording layer. The data recording layer includes the first recording unit area and the second recording unit area. The radius having the same circumference as a length of the second recording unit area forms a boundary between the first recording unit area and the second recording unit area. The first recording unit area records data by the first recording unit and the second recording unit area records data by the second recording unit longer than the first recording unit. The first recording unit area includes a lead-in zone and the second recording unit area includes a data zone.

Description

Small size optical disc {Small size optical disc}

The present invention relates to an information storage medium and, more particularly, to a compact optical disc capable of high density data recording and / or playback on a smaller sized disc.

There are various types of information storage media for storing information, such as magnetic disks such as floppy disks and hard disks, magnetic tapes, semiconductor memory chips such as ROM or RAM, and optical disks for recording data using lasers.

Among such information storage media, optical disks are rapidly increasing information storage capacity due to the development of related technologies, and their prices are relatively inexpensive and are widely used. Optical disks are classified into compact disks (CDs) and digital versatile disks (DVDs) according to information storage capacity. In addition, optical discs capable of recording, erasing and reproducing include 650MB CD-R, CD-RW, 4.7GB DVD + RW, and the like. Furthermore, HD-DVDs with a recording capacity of 20GB or more are being developed.

Recently, there has been an attempt to use an optical disc as an information storage medium of a portable electronic device capable of recording and / or playing back not only audio but also image information such as a camcorder. However, there are various problems in using a conventional optical disk in a portable electronic device such as a camcorder. That is, an 80mm or 120mm sized optical disk, which is mainly used at present, is too large to use as an information storage medium of a camcorder, and there is a problem of high power consumption.

Therefore, in order to use an optical disk as an information storage medium of a portable electronic device such as a camcorder, a smaller optical disk having a smaller size than a conventional optical disk but having a higher data recording density is required. However, when data is recorded in a recording block (or ECC block) unit of the same size as a conventional unit on a small optical disk having a smaller size than a conventional optical disk, a problem occurs when recording data in the inner peripheral area of the small optical disk.

1 is a diagram showing an inner circumferential region of a small optical disc in which data is recorded in units of a conventional recording block.

Referring to FIG. 1, when recording data from the inner circumference to the circumferential direction in units of a 64 KByte conventional recording block in a data recording area of a predetermined radius, for example, 6 mm from the center of a small optical disk, one conventional recording block is It is recorded in the area from point A to point D shown in FIG.

That is, when the conventional recording block is recorded from the innermost circumference, it is recorded over two tracks of tracks, and as shown in FIG. 1, a portion where one recording block overlaps in the radial direction occurs. If a defect occurs in a portion where one recording block overlaps in the radial direction, such as scratches, dust, or fingerprints, the effect of the defect is doubled as compared to the case where a defect occurs in a recording block that does not overlap in the radial direction. The error correction capability is significantly reduced, which may cause a problem in the reliability of the reproduced data.

Accordingly, an object of the present invention is to provide an optical disk capable of recording and / or reproducing information reliably and recording all necessary information even if the size of the information storage medium becomes small.

An optical disk according to an aspect of the present invention for achieving the above object,

An optical disc comprising at least one data recording layer, wherein data is recorded in two recording units, a first recording unit and a second recording unit having a length longer than that of the first recording unit. The data recording layer is divided into a first recording unit area and a second recording unit area on the basis of a radius having a circumferential length equal to a length, and data is recorded in the first recording unit area in the first recording unit area. In the second recording unit area, data is recorded in the second recording unit.

The first recording unit area preferably includes a lead-in zone, and the second recording unit area preferably includes a data zone.

The read-in zone may further include at least one of a control data zone, an OPC zone for optimal power control, a defect management zone, or a disk information zone.

Further, when the optical disc has at least two data recording layers, it is preferable that each data recording layer has the lead-in zone, and the control data zone or the BCA zone is provided in only one data recording layer. .

Further, the data recording layer provided with the control data zone or the BCA zone is more preferably a data recording layer farthest from the pickup for irradiating light.

Further, when the optical disc has at least two data recording layers, the lead-in zone of each data recording layer includes an OPC zone, the OPC zone of the odd-numbered data recording layer and the even-numbered data recording layer adjacent thereto. The OPC zones are preferably arranged so as not to contact each other with respect to the direction in which light is incident.

An optical disk according to another aspect of the present invention for achieving the above object,

10. An optical disc comprising at least one data recording layer, each data recording layer comprising a lead-in zone, a data zone, and a lead-out zone, wherein the lead-in zone and the lead-out zone include an OPC zone; The data according to the first error correction format is recorded in the OPC zone, and the data according to the second error correction format is recorded in the data zone.

The first error correction format is preferably a 32 kilobyte error correction format and the second error correction format is a 64 kilobyte error correction format.

An optical disk according to another aspect of the present invention for achieving the above object,

An optical disc comprising at least one data recording layer, wherein data is recorded in a recording unit conforming to a predetermined error correction format, the optical disc being shorter than the length of the recording unit on the basis of a radius having a circumferential length equal to the length of the recording unit. The data recording layer is divided into a first data area having a circumferential length and a second data area having a circumferential length longer than the length of the recording unit, wherein data is recorded.

Further, data in which the predetermined error correction does not need to be performed or data following an error correction method different from the predetermined error correction format is recorded in the first data area, and in the second data area according to the predetermined error correction format. It is preferable that data for which error correction is to be performed is recorded.

Further, when the optical disk has at least two data recording layers, each data recording layer includes an OPC zone, and the OPC zone of the odd-numbered data recording layer and the OPC zone of the even-numbered data recording layer adjacent thereto are optical. It is preferable to arrange | position so that it may not mutually contact with respect to this incident direction.

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

2 is a diagram showing a data area structure of a small optical disc according to the first embodiment of the present invention. Fig. 2A shows a single recording layer optical disc, and Fig. 2B shows a dual layer optical disc.

In this embodiment, in order to be able to record and / or reproduce data reliably, data is recorded using two types of recording units, a first recording unit and a second recording unit having a larger data capacity than the first recording unit. To the optical disc. In addition, an area inside the boundary is called a first recording unit area, and an area outside the boundary is called a second recording unit area, with the radius having the same circumferential length as the length of the second recording unit. The data is recorded in the first recording unit area in the first recording unit and the data is recorded in the second recording unit area in the second recording unit so that one recording unit overlaps in the radial direction of the optical disc as described above. Prevents radically.

The recording unit refers to an ECC block. In this embodiment, the first recording unit uses an ECC block of 32 KB and the second recording unit uses an ECC block of 64 KB. The 64 KB ECC block has a larger data capacity than the 32 KB ECC block, so when writing to an optical disk, the physical length of the 64 KB ECC block is longer than the 32 KB ECC block.

The structure of the single recording layer optical disc shown in Fig. 2A will be described in more detail. The optical disc includes a BCA zone, a lead-in zone, a data zone and a lead-out zone. The BCA zone is an area for recording BCA information, that is, a serial number of an optical disc. The BCA information may be engraved by a laser in the BCA area, which is a mirror, and the information recorded in the control data zone may be pit or wobble in order to have a process continuity with the information recorded in the adjacent control data zone. If data is recorded according to the (wobble) method, record BCA information in the same manner.

The lead-in zone includes a control data zone, an optimum power control (OPC) zone, and a disc information zone. The control data zone records basic information about the optical disc, such as the size of the optical disc, the version number of the standard, the number of recording layers, and information related to recording such as a writing strategy parameter or a recording speed.

The data recorded in the control data zone can be recorded by forming a pit or by molding high frequency wobble into a track. It is also possible to record data in a pre-recording manner. The pre-recording method refers to recording data in advance in the same manner as a data recording method by a drive, for example, a phase change recording method.

On the other hand, when data is recorded in the wobble method, the same data is repeatedly recorded to improve the reliability of the recorded data.

The OPC zone is an area reserved for obtaining the optimum recording power.The drive loaded with the optical disc is used when the recording quality is the best after recording the data while changing the recording power in the OPC zone before recording the actual data on the optical disc. The recording power is determined as the recording power to be used for actual data recording.

The disc information zone contains information about defect management, information about the drive, change information of the disc to be updated by using the optical disc such as the address of the last recorded data zone, and write protection information. Is recorded.

Although the area for a specific purpose is not separately set in the lead-out zone, an OPC zone or the like may be arranged according to the change in data capacity. Although not separately shown in the drawing, it is preferable to arrange buffer areas on both sides of the OPC zone in consideration of the eccentricity of the optical disk and the error of the start radius of each data zone.

In addition, since important information is recorded in the control data zone, it is preferable that the same information is duplicated and recorded so that the track pitch is larger than other areas. In the case where the pit is formed and data is recorded in the control data zone, it is preferable that the size of the minimum pit is made larger than the other area if it is equal to the track pitch of the other area.

Since error correction is not necessary for data recorded in the OPC zone, the position of the control data zone and the OPC zone may be interchanged in the single recording layer optical disc shown in FIG.

Next, the structure of the dual recording layer optical disc shown in Fig. 2B will be described in more detail. In the illustrated dual recording layer optical disc, the recording layer of the single recording layer optical disc shown in Fig. 2A is referred to as L0 as the basic recording layer, and L1 as the second recording layer is disposed below. In the pickup included in the drive, the recording layer located on the far side is L0, and the recording layer located on the side near the pickup is L1.

The data area structure of L1 is similar to that of L0. However, the BCA zone is not provided and the OPC1 is disposed at the position of the control data zone of L0, and the area of L1 at the same position as the OPC0 of L0 is left as a reserved area.

OPC0 and OPC1 provided in the dual recording layer optical disk according to the present embodiment are alternately arranged so as not to be mutually assigned to different radial ranges of the optical disk. If OPC0 and OPC1 are arranged to be in contact with each other on the optical disk in the same radius range, each OPC zone may be assigned to its original purpose due to factors such as the intensity of light irradiated to the OPC zone or the data recording state of each OPC zone. This is because it may not be used smoothly.

No data is recorded in the area of L1 corresponding to the BCA area of L0. This is to distinguish the information area from the information zone. The information area refers to an area from the innermost circumference to the lead-out zone, and the information zone refers to an area limiting the BCA zone in the information area.

The structure of the compact optical disc according to the first embodiment of the present invention shown in Fig. 2 is applicable to both a rewritable, write once-writable medium, and a reproduction-only optical disc. However, in the case of a reproduction-only medium, since the OPC area is not necessary, this area is used for other purposes. For example, it is used as an area for recording a test pattern. The test pattern is necessary for reproducing data recorded on a read-only medium, for example, a pattern for measuring modulation degree.

Hereinafter, the radius on the small single recording layer optical disk shown in Fig. 2A and the optical disk having the same circumferential length as that of one ECC block under specific conditions will be obtained.

An optical disc is a 37 mm diameter optical disc capable of recording 4.7 GB of data corresponding to a DVD data capacity. Specific specifications are as follows. Minimum mark length is 0.119um, modulation code is RLL (1,7), ECC size is 32KB in the area under the lead-in zone, 64KB in the data zone, track pitch is 0.32um and the radius is available for pick-access 8mm. In addition, the area which cannot be used as a bump generated by the 0.1mm cover layer coating is 1.0mm.

Under the above conditions, the radius of the length of the 64 KB ECC block and the length of the circumference on the optical disc is equal to 9.2 mm. Therefore, an area smaller than 9.2 mm in radius is determined as the first recording unit area, and an area larger than 9.2 mm in radius is determined as the second recording unit area. Data is recorded in 32 KB ECC block units in the first recording unit area, and data is recorded in 64 KB ECC block units in the second recording unit area.

In the first recording unit area, a lead-in zone is arranged, and in the second recording unit area, a data zone and a lead-out zone are arranged.

On the other hand, in consideration of the small optical disks of various sizes, in the radius and data capacity shown in Figure 2, those shown in parentheses are 46mm in diameter of the optical disk, those without parenthesis are values corresponding to 37mm in diameter. to be.

The data area structure of the optical disk according to the first embodiment of the present invention described above is shown in a table as shown in FIGS. 3A and 3B. 3A is a table showing a data area structure of a single recording layer optical disc according to the first embodiment of the present invention, and FIG. 3B is a second recording layer L1 of the dual recording layer optical disc according to the first embodiment of the present invention. This table shows the data area structure of the data. In the case where the optical disc is a reproduction-only medium, the OPC area is replaced with the area in which the test pattern is recorded because the OPC area is not needed as described above.

4 is a diagram showing a data area structure of a small optical disc according to a second embodiment of the present invention. Fig. 4A shows a single layer optical disc, and Fig. 4B shows a dual layer optical disc.

The second embodiment according to the present invention has the same structure as that of the optical disk according to the first embodiment shown in FIG. However, an additional OPC zone is placed in the lead out zone. Since the data recorded in the OPC zone does not need error correction, the OPC zone provided in the lead-out zone is also recorded in units of 32 KB ECC blocks as in the data recorded in the lead-in zone. This is to allow the drive to have the same access to the OPC zone provided in the lead-in zone and the lead-out zone.

5 is a diagram showing a data area structure of a small optical disc according to a third embodiment of the present invention. FIG. 5A shows a single layer optical disc, and FIG. 5B shows a dual layer optical disc.

The structure of the optical disc according to the third embodiment of the present invention is the same as that of the optical disc according to the first embodiment shown in FIG. However, data is recorded in the same recording unit (ECC block) over all areas of the optical disk. In this embodiment, a 64 KB ECC block is used as a recording unit.

The optical disc according to the third embodiment of the present invention arranges the data area on the basis of a radius having a circumferential length equal to the length of the 64 KB ECC block in order to increase the reliability in data recording and / or reproduction.

In more detail, the area inside the boundary is called the first data area, and the area outside the boundary is called the second data area, with the radius having the same circumferential length as the length of the ECC block. Data in which the error correction does not need to be performed or data conforming to an error correction format different from the error correction format is recorded in the first data area, and data to which error correction is performed in accordance with the error correction format are recorded in the second data area.

Referring to Fig. 5A, an OPC zone and a control data zone where no error correction is necessary are arranged in the first data area. Since the data to be recorded in the control data zone can be formed with pits or high frequency waves as described above, error correction performance is not required as high as the data to be recorded in the data zone. Therefore, in the control data zone, data may be recorded in units of 64 KB ECC blocks like the data to be recorded in the data zone, or data may be recorded according to various ECC formats such as 32 KB, 16 KB, 8 KB, 4 KB, and 2 KB. .

In the second data area, a disc information zone in which defect management information and drive related information, which are information for which ECC performance is to be guaranteed, is recorded, and a data zone in which user data is recorded is disposed.

The boundary between the first data area and the second data area is a position on an optical disk having a radius of 9.2 mm as shown in FIG.

In the case of the dual recording layer optical disc of FIG. 5B, similarly to the case of the single recording layer optical disc of FIG. 5A, the OPC zone and the control data zone are arranged in the first data area.

6 is a diagram showing a data area structure of a small optical disc according to a fourth embodiment of the present invention. FIG. 6A shows a single layer optical disc, and FIG. 6B shows a dual layer optical disc.

The structure of the optical disc according to the fourth embodiment of the present invention records data in the same ECC block unit as in the third embodiment of the present invention shown in Fig. 5 and borders a radius having a circumferential length equal to the length of the ECC block. In other words, an area inside the boundary is called a first data area, and an area outside the boundary is called a second data area. In addition, data in which the error correction does not need to be performed or data conforming to an error correction format different from the error correction format are recorded in the first data area, and data to be performed in accordance with the error correction format are recorded in the second data area. .

The structure of the optical disc according to the fourth embodiment of the present invention is similar to that of the optical disc according to the third embodiment, but the OPC zone is positioned after the BCA zone, and the control data zone is placed in the second data area. There is a difference in points.

In the dual recording layer disc shown in Fig. 6B, in order to alternately arrange the OPC zones of the respective recording layers, OPC1 present in L1 is disposed in the second data area.

Although the optical disk according to the preferred embodiment of the present invention described above has been described with respect to an optical disk having a single recording layer or a double recording layer, the optical disk can also be applied to an optical disk having three or more data recording layers.

As described above, according to the present invention, even if the size of the information storage medium becomes small, all necessary information can be recorded. In particular, one ECC block is recorded over a plurality of tracks, so It is possible to reliably record and / or reproduce information by preventing the reduction of error correction capability due to occurrence.

1 is a view showing that data is recorded in a conventional recording unit in an inner circumferential region of a small optical disc according to the prior art;

2 is a diagram showing a data area structure of a small optical disc according to a first embodiment of the present invention;

3A is a table showing a data area structure of a single recording layer optical disc according to the first embodiment of the present invention;

3B is a table showing a data area structure of a second recording layer of the dual recording layer optical disc according to the first embodiment of the present invention;

4 is a diagram showing a data area structure of a small optical disc according to a second embodiment of the present invention;

5 is a diagram showing a data area structure of a small optical disc according to a third embodiment of the present invention;

6 is a diagram showing a data area structure of a small optical disc according to a fourth embodiment of the present invention.

Claims (21)

An optical disc comprising at least one data recording layer, wherein data is recorded in two recording units, a first recording unit and a second recording unit having a length longer than that of the first recording unit. The data recording layer is divided into a first recording unit area and a second recording unit area on the basis of a radius having a circumferential length equal to the length of the second recording unit, And data is recorded in the first recording unit area in the first recording unit area, and data is recorded in the second recording unit area in the second recording unit area. The method of claim 1, And the first recording unit area includes a lead-in zone, and the second recording unit area includes a data zone. The method of claim 2, And the lead-in zone includes at least one of a control data zone, an OPC zone for optimal power control, a defect management zone, or a disk information zone. The method of claim 3, wherein And the control data zone records data according to one of a pit method, a wobble method, and a pre-recording method. The method of claim 3, wherein And the track pitch of the control data zone is equal to or greater than the track pitch of another area of the optical disc. The method of claim 3, wherein The optical disc further includes a BCA zone in which BCA information is recorded in an inner diameter than the lead-in zone, And the BCA zone records the BCA information in the same manner as the data recording method of an adjacent zone. The method of claim 6, The BCA information is recorded according to the pit method or the wobble method. The method of claim 6, When the optical disc has at least two data recording layers, each data recording layer has the lead-in zone, and the control data zone or the BCA zone is provided in only one data recording layer. disk. The method of claim 8, And the data recording layer provided with the control data zone or the BCA zone is a data recording layer farthest from the pickup for irradiating light. The method of claim 3, wherein If the optical disc has at least two data recording layers, the lead-in zone of each data recording layer includes an OPC zone, and the OPC zone of the odd-numbered data recording layer and the OPC zone of the even-numbered data recording layer adjacent thereto. And the zones are staggered so as not to contact each other with respect to the direction in which light is incident. An optical disc comprising at least one data recording layer, each data recording layer provided with a lead-in zone, a data zone and a lead-out zone, The read-in zone and the read-out zone include an OPC zone, in which the data according to the first error correction format is recorded in the OPC zone, and the data according to the second error correction format is recorded in the data zone. Optical disk. The method of claim 11, And said first error correction format is a 32 kilobyte error correction format and said second error correction format is a 64 kilobyte error correction format. An optical disc comprising at least one data recording layer, wherein data is recorded in a recording unit conforming to a predetermined error correction format, Recording the data into a first data area having a circumferential length shorter than the length of the recording unit and a second data area having a circumferential length longer than the length of the recording unit bordering on a radius having a circumference length equal to the length of the recording unit An optical disc characterized in that data is recorded in divided layers. The method of claim 13, And the data in which the predetermined error correction does not need to be performed or data conforming to an error correction method different from the predetermined error correction format is recorded in the first data area. The method of claim 13, And data in which the error correction is to be performed according to the predetermined error correction format is recorded in the second data area. The method of claim 13, And the first data area includes a control data zone or an OPC zone for optimal power control, and the second data area includes at least a user data zone. The method of claim 16, And the control data zone records data according to one of a pit method, a wobble method, and a pre-recording method. The method of claim 16, And the track pitch of the control data zone is equal to or greater than the track pitch of another area of the optical disc. The method of claim 13, And wherein the optical disc comprises at least two data recording layers, the control data zone in which information about the optical disc is recorded or the BCA zone in which BCA information is recorded is provided in only one data recording layer. The method of claim 19, And the data recording layer provided with the control data zone or the BCA zone is a data recording layer farthest from the pickup for irradiating light. The method of claim 13, When the optical disk has at least two data recording layers, each data recording layer includes an OPC zone, and light enters the OPC zone of the odd-numbered data recording layer and the OPC zone of the even-numbered data recording layer adjacent thereto. The optical disks are arranged alternately so as not to contact each other on the basis of the direction.