JP2000285467A - Optical disc - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disc that minimizes overhead in the address storage region and improve physical format application efficiency to assure easier address read operation. SOLUTION: An address information is composed of a plurality of bits and the first bit is formed through wobble superimposition of the address information of the combination (A0, B0), while the second bit through that of the combination (A1, B1) and the third bit through that of the combination (A1, B1). Namely, as the address information, the address AD0 of the first bit is bit '0', while the address AD1 of the second bit is bit '1' and the address AD2 of the third bit is bit '1'. The expression system of this address information is an improved AM type wobble address that is applied through superimposition to the wobble of the track groove of the address information in the actual physical format of an optical disc using OOK(On Off-Keying) as the digital modulation format of the AM(Amplitude Modulation) system.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rewritable optical disk using a large-capacity phase-change medium or MO (magneto-magnetic) medium for handling image data and audio data, and a write-once optical disk using a dye-based medium. Related to optical disks of the type.

[0002]

2. Description of the Related Art DVDs (digital video disks), MO disks and CDs (compact disks) have been commercialized as large-capacity media for computers.
In particular, with the spread of computers, users frequently edit data, and the need for recording media on which data can be changed and data can be additionally recorded has been increased.

As a recording medium on which a user can change data and additionally write data, a DVD-ROM using a phase change medium is used.
RAM (Random Access Memory), MO disk using MO media, CD-R and CD-R
W (ReWritable) is used. Among them, CD-
R is a write-once optical disk using a dye-based medium. Other optical disks are rewritable optical disks.

[0004]

However, the above-mentioned conventional DVD-RAM and MO disk manage the unallocated space in which data is not written.
An ID (Identification) portion indicating an address is preformatted by prepits. For this reason, the above-mentioned conventional DVD-RAM and MO disk require an area for forming an ID portion, and have a disadvantage that the efficiency of using the area of the optical disk in the physical format is deteriorated.

In the above-described conventional DVD-RAM and MO disks, the ID section is provided for storing data in both land tracks and groove tracks. There is a disadvantage that the structure is different, the manufacturing process becomes complicated, and the disk manufacturing becomes difficult. Further, in the case of a DVD-RAM, since the ID portions are arranged in a staggered manner, the manufacture of a disc is particularly complicated.

Next, the above-mentioned conventional CD-R and CD-R
The RW manages the address space on the disk,
A wobble address method based on an FM (frequency modulation) method is used. Here, the wobble (meander) indicates a structure in which tracks are formed in a meandering manner in the radial direction of the disk.

That is, the conventional CD-R and CD-RW
Stores the address of each sector superimposed on the wobble by frequency modulation of the wobble cycle. For this reason, in the conventional CD-R and CD-RW, the wobble period (track length) differs for each sector in accordance with the data of the address superimposed on the wobble by frequency-modulating the wobble period. However, since it is not constant, there is a problem that data writing control becomes complicated.

Further, in the conventional CD-R and CD-RW, address data is superimposed on a wobble by frequency modulation. Since it is necessary to detect the address by demodulating the frequency, there is a disadvantage that the configuration of the reading device is complicated.

The present invention has been made under such a background, and by minimizing the overhead of the address storage area, it is possible to improve the use efficiency of the storage area in the physical format and to facilitate the reading of the address. It is to provide an optical disk capable of performing.

[0010]

According to the first aspect of the present invention,
In a rewritable optical disk such as a phase change medium or a magneto-optical medium or a write-once optical disk such as a dye-based medium on which a spiral track for recording information or reproducing the recorded information is formed, A meandering portion formed to meander in the radial direction of the optical disc and a non-meandering portion that is not meandering are continuously formed, and the management information of the optical disc is stored by a combination of the meandering portion and the non-meandering portion. It is characterized by the following.

According to a second aspect of the present invention, in the optical disk of the first aspect, an address of a storage area of the optical disk is determined by a combination (A, B) of the period A of the meandering portion and the period B of the non-meandering portion. It is characterized by performing address management on the optical disk by expressing information and superimposing this address information on the meandering of the track.

According to a third aspect of the present invention, in the optical disk according to the first or second aspect, in the address information, a bit “0” is represented by a period A0 of a meandering portion.
(A0, B0) with period B0 of the non-meandering part
The bit “1” is represented by a combination (A1, B1) of the period A1 of the meandering portion and the period B1 of the non-meandering portion, and a combination of the combination (A0, B0) and the combination (A1, B1). The address information is expressed on the basis of the above-mentioned address information, and the address information is superimposed on the meandering of the previous track to manage the address on the optical disk.

According to a fourth aspect of the present invention, in the optical disk of the third aspect, a value obtained by adding the period A0 of the meandering portion and the period B0 of the non-meandering portion is equal to the period A1 of the meandering portion.
And the period B1 of the non-meandering portion is equal to the value of the period.

According to a fifth aspect of the present invention, in the optical disk according to any one of the first to fourth aspects, the optical disk is configured by dividing the track into a plurality of zones in a radial direction. Zone address information indicating an address for each zone is indicated by the address information superimposed on the meandering of the track.

According to a sixth aspect of the present invention, in the optical disk according to the first or second aspect, in the address information, a period A of the meandering portion and a period B of the non-meandering portion are variable for each address, and a combination ( A, B) expresses the address information, and superimposes the address information on the meandering of the track, thereby performing address management on the optical disc.

According to a seventh aspect of the present invention, in the optical disk of the sixth aspect, in the combination (A, B), only the period A of the meandering portion is changed to express the address information.

According to an eighth aspect of the present invention, in the optical disk of the sixth or seventh aspect, the optical disk is formed by dividing the track into a plurality of zones in a radial direction. Zone address information indicating each address is indicated by the address information superimposed on the meandering of the track.

According to a ninth aspect of the present invention, in the optical disk according to any one of the first to eighth aspects, the adjacent tracks in the zones have the same meandering frequency phase. It is characterized by.

According to a tenth aspect of the present invention, in the optical disk according to any one of the first to ninth aspects, both the period A of the meandering portion and the period B of the non-meandering portion meander in the track. Is set to a value that is an integral multiple of one cycle of

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a conceptual diagram showing a configuration in which tracks formed on an optical disc 1 are divided into a plurality of zones. In this figure, an optical disc 1 is a DVD-RA of a rewritable optical disc using a phase change medium.
M, CD-RW, MO disk of a rewritable optical disk using an MO medium, CR-R which is a write-once optical disk using a dye-based medium, and the like.

The physical format of the storage area of the optical disk 1 is such that a spiral track groove for storing information or reproducing recorded information is formed in the radial direction of the optical disk 1, and this track has a radius of It is divided in the direction into a plurality, for example, from zone 21 to zone 2n (n is a natural number). The track groove is a portion surrounded by the land L shown in FIG. 2, and the bottom of the track groove T is a groove G. The periodic waviness of the track groove T is a wobble. In this figure, light H for reading enters from the bottom surface of the optical disk.

Here, in the track groove forming the zone, a meandering portion that wobble at a predetermined period in the radial direction of the optical disc 1 and a non-wandering portion that does not wobble are formed continuously. The address information indicating the address in the physical format of the storage area of the optical disc according to the embodiment of the present invention is indicated by the value of the continuous period between the meandering portion and the non-meandering portion.

Next, a data format indicating "0" of address information indicating an address in a physical format of a storage area of an optical disk according to an embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a conceptual diagram of a wobble (meandering) state of a track indicating bit “0” of address information.

In the structure indicating the bit "0", for example, a meandering portion is formed continuously over a period A0 of seven periods of the wobble.
The non-meandering portion is formed over one period B0 of the wobble. That is, a combination of the period A0 of the meandering portion and the period B0 of the non-meandering portion (A0, B0) = (7, 1)
Indicates a bit “0”.

Next, a data format indicating "1" of address information indicating an address in a physical format of a storage area of an optical disk according to an embodiment of the present invention will be described with reference to the drawings. FIG. 4 is a conceptual diagram of a wobble (meandering) state of a track indicating bit “1” of address information.

In the structure indicating bit "1", for example, a meandering portion is formed continuously over a period of six wobble periods, and a non-meandering portion is formed continuously over a period of two wobble periods. That is, the combination (A1, B1) = (6, 2) with the period A1 of the meandering portion and the period B1 of the non-meandering portion,
This indicates bit “1”.

Next, the structure of address information indicating an address in a physical format of a storage area of an optical disk according to an embodiment of the present invention will be described with reference to the drawings. FIG.
FIG. 5 is a conceptual diagram illustrating a configuration of address information using the data formats of FIGS. 3 and 4.

In this figure, for example, the address information shown in FIG. 5 is composed of a plurality of bits, the first bit is a combination (A0, B0), the second bit is a combination (A1, B1), and the three bits are Mega combination (A1, B1)
Is superimposed on the wobble. That is, as the address information, the first bit address AD0 is bit “0”, the second bit address AD1 is bit “1”, and the third bit address AD2 is bit “1”. .

In the bit string shown in FIG. 5, the combination (A0, B0) = (7, 1) and the combination (A1, B1) = (6, 2) are set. Period A
The values of 1 and the period B1 can be arbitrarily changed.

The address information is represented by an OOK (On Off-K) which is a digital modulation type of the AM (amplitude modulation) method.
This is an improved AM wobble address in which address information in an actual physical format of an optical disc is superimposed on a wobble of a track groove and adapted using the eying). Further, since such an OOK method uses a DC-free code, it can be easily superimposed on a wobble of a track groove, and address data can be easily extracted from address information, which is extremely practical.

Further, if the period A0, the period B0, the period A1, and the period B1 are set so as to satisfy the condition of A0 + B0 = A1 + B1, the wobble period necessary for expressing one address is always constant. And the period indicating the address information of all the storage areas on the optical disk has the same value, and the address information can be easily read from the wobble.

As described above, in the optical disk according to the embodiment of the present invention, the wobble of the track groove uses the meandering portion and the non- meandering portion as data representing bits, and is recorded with address information superimposed thereon. Since there is no need for a pre-pit area for recording an address, it is possible to minimize the overhead of the address recording area on the optical disc, and to have a recording format of address information in a physical format suitable for increasing the capacity.

Further, in the optical disc according to the embodiment of the present invention, in the FM system in which the period (track length) of the wobble on which the address is superimposed by the frequency modulation is different for each sector, the frequency expressing the address is equal to all the addresses. Since the data is the same and the track length is constant, the data write control is easy, and it is not necessary to demodulate a plurality of frequencies, and the address can be detected from one frequency. ,
The configuration of the optical disk reading device can be simplified.

As described above, one embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and a design change or the like may be made without departing from the gist of the present invention. The present invention is also included in the present invention. With reference to FIG. 6, the format of the address information indicating the address of the storage area in the physical format of the storage area of the optical disk according to the second embodiment of the present invention will be described. For example, in FIG.
FIG. 3 is a conceptual diagram of a wobble state of a track showing a data format of address information.

As in the optical disk of one embodiment, the bit value is not determined by the combination (A, B) of the period A of the meandering portion of the track groove and the period B of the non-meandering portion. In the embodiment, the combination of the ratio (A, B) shown in FIG. 7 between the meandering period A and the non- meandering period B indicates the address value.

FIG. 7 shows, for example, a combination (A, A) indicating each zone and the address information of this zone by using the format of the address information by superimposing the address information on the wobble according to the second embodiment. 6 is a table showing the relationship with B). In this table, the optical disk
The address information of one zone (Zone) 21 is a combination (X0, Y0),..., The address information of the zone (Zone) 2n is a combination (Xn, Yn).

In the second embodiment, this combination (A, B) is superimposed on the wobble of the track as in the case of the first embodiment, thereby storing the address information of the storage area of the optical disk.

At this time, when the address information is set for each zone, the period A of the meandering portion and the period B of the non-meandering portion are changed. However, if the period B is set too long, the signal of the wobble frequency is not detected. Since there is an adverse effect that an accurate wobble cycle cannot be obtained, the period B is fixed and only the value of the period A is variable.

As described above, in the optical disk according to the second embodiment of the present invention, the address information is recorded by superimposing the address information on the wobble of the track groove by the combination of the ratio of the meandering portion and the non-meandering portion. Since a pre-pit area for recording data is not required, it is possible to minimize the overhead of recording data and addresses in the data storage area on the optical disc,
It has a recording format of address information in a physical format suitable for large capacity.

Further, in the optical disc according to the second embodiment of the present invention, in the FM system in which the period (track length) of the wobble on which the address is superimposed by the frequency modulation is different for each sector, the frequency expressing the address is all. Since the address value is the same and the track length is constant, data write control is easy, and it is not necessary to demodulate a plurality of frequencies, and the address can be detected from one frequency, so that address detection is easy. Thus, the configuration of the optical disk reading device can be simplified.

Further, in the optical discs according to the first and second embodiments, when the information of the address of the storage area is superimposed on the wobble of the track to form the track groove, at least in each zone, a CAV (Constant A) is used.
The track grooves are formed in a state where the rotation is controlled by an optical disk drive by an ngular Vwlocity method.

By doing so, the phase of the wobble between tracks adjacent to each zone is substantially aligned as shown in FIG. 8, so that a constant track pitch can always be ensured, Even in a groove, it is possible to detect modulated data of a wobble frequency without crosstalk from an adjacent track. Thus, the first and second embodiments of the present invention can be applied to the land & groove recording method (see FIG. 9). The land & groove recording method is a method of writing data to both the land L and the groove G.

Further, in the optical disks according to the first and second embodiments, the period A of the meandering portion and the period B of the non-meandering portion are both set to be an integral multiple of one wobble period. Since the wobble of the storage area on the optical disk has the same period, the production of the optical disk is easy, and a stable wobble frequency is always detected, so that the operation of a PLL (Phase Locked Loop) control system is also stabilized.

[0044]

According to the first aspect of the present invention, a rewritable optical disk such as a phase change medium or a magneto-optical medium, on which a spiral track for recording information or reproducing the recorded information is formed. In a write-once optical disc such as a dye-based medium, a meandering portion formed by the track meandering in the radial direction of the optical disc and a non- meandering portion that is not meandering are continuously formed. Since the management information of the optical disk is stored in combination with the part, data such as address information of the storage area of the optical disk can be stored in a combination of a meandering part and a non-meandering part. In comparison, the overhead of the pre-pit area indicating management data such as an address is not required, so that the storage capacity of the optical disc is reduced. The physical format suitable for increasing the capacity can be obtained, the disk can be easily manufactured, and the track length and the period of the meandering portion of the wobble are constant as compared with the FM method. It is easy to detect information, and the configuration of the optical disk reading device is also simplified.

According to the second aspect of the present invention, the address information of the storage area of the optical disk is expressed by a combination (A, B) of the period A of the first meandering portion and the period B of the first non-meandering portion. The address management on the optical disk is performed by superimposing the address information on the meandering of the track in the previous period, so that the overhead of the pre-pit area indicating management data such as the address is not required as compared with the pre-pit address system, so that the The storage capacity can be increased, a physical format suitable for increasing the capacity can be obtained, the disk can be easily manufactured, and
Since the track length and the period of the wobble portion of the wobble are constant as compared with the M method, it is easy to detect the address information, and the configuration of the optical disk reading device is also simplified.

According to the third aspect of the present invention, in the address information, the expression of the bit "0" is expressed by a combination (A) of the meandering period A0 and the non-meandering period B0.
0, B0), and the expression of the bit “1” is represented by a combination (A) of the meandering period A1 and the non-meandering period B1.
1, B1), the address information is expressed based on the combination (A0, B0) and the combination (A1, B1), and the address information is superimposed on the meandering of the previous track, so that the address information on the optical disc is reproduced. Since address management does not require the overhead of a pre-pit area indicating management data such as addresses as compared with the pre-pit address method, it is possible to increase the storage capacity of the optical disk and obtain a physical format suitable for increasing the capacity. Can be manufactured, and the disk can be easily manufactured.
Since the track length and the period of the meandering portion of the wobble are constant as compared with the system, it is easy to detect the address information, and the configuration of the optical disk reading device is also simplified.

According to the fourth aspect of the present invention, the value of the period obtained by adding the period A0 of the meandering portion and the period B0 of the non-meandering portion is obtained by adding the period A1 of the meandering portion and the period B1 of the non-meandering portion. In this configuration, the periods indicating the address information of all the storage areas on the optical disk have the same value, and the address information can be easily read from the wobble.

According to the fifth aspect of the present invention, the optical disk is constituted by dividing the track into a plurality of zones in the radial direction, and zone address information indicating an address of each zone is stored in the track. Since it is indicated by the address information superimposed on the meandering, a pre-pit area for storing an address is not required, so that an overhead of a pre-pit area indicating management data such as an address is not required as compared with the pre-pit address method, The storage capacity of the optical disk can be increased, a physical format suitable for increasing the capacity can be obtained, the disk can be easily manufactured, and the track length and the period of the wobble portion of the wobble are smaller than those of the FM system. Because it is constant, it is easy to detect the address information, and the configuration of the optical disk reading device is also It becomes easy.

According to the sixth aspect of the present invention, in the address information, the period between the period A of the meandering portion and the period B of the non-meandering portion is variable for each address, and the combination (A,
B) expresses the address information, and superimposes the address information on the meandering of the previous track to perform address management on the optical disk. Therefore, a pre-pit indicating management data such as an address as compared with the pre-pit address method is used. Since the overhead of the area is not required, the storage capacity of the optical disk can be increased, a physical format suitable for increasing the capacity can be obtained, the disk can be easily manufactured, and the track length can be reduced as compared with the FM method. Also, since the period of the wobble portion of the wobble is constant, it is easy to detect the address information, and the configuration of the optical disk reading device is also simplified.

According to the seventh aspect of the present invention, in the combination (A, B), only the period A of the meandering portion is varied to express the address information. Since the overhead of the pre-pit area indicating the management data of the optical disk becomes unnecessary, the storage capacity of the optical disk can be increased, a physical format suitable for increasing the capacity can be obtained, the disk can be easily manufactured, and the FM system can be used. In comparison, since the track length and the period of the wobble portion of the wobble are constant, it is easy to detect the address information, and the configuration of the optical disk reading device is also simplified.

According to the eighth aspect of the present invention, the optical disk is constituted by dividing the track into a plurality of zones in the radial direction, and the zone address information indicating the address of each zone is meandering of the track. Since it is indicated by the address information superimposed on the pre-pit address system, a pre-pit area for storing an address on the optical disk is not required, so that an overhead of a pre-pit area indicating management data such as an address is not required as compared with the pre-pit address system. Therefore, the storage capacity of the optical disk can be increased,
A physical format suitable for large capacity can be obtained,
Also, since the disk is easy to manufacture, and the track length and the period of the wobble portion of the wobble are constant as compared with the FM system, it is easy to detect the address information, and the configuration of the optical disk reading device is simple. Become.

According to the ninth aspect of the present invention, since the meandering frequency of the adjacent tracks in the zone is configured to be equal in phase, a constant track pitch can always be ensured, and the land and the land can be secured. Even in a groove, it is possible to detect modulated data of a wobble frequency without crosstalk from an adjacent track.

According to the tenth aspect of the present invention, both the period A of the meandering portion and the period B of the non-meandering portion are set to values that are integral multiples of one cycle of the track meandering. Therefore, since the wobble cycle is always the same, it is easy to make a disc. By constructing a PLL (Phase Locked Loop) control system based on the wobble signal having the uniform cycle, the PLL control system operates stably. It becomes possible.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing a configuration in which a track formed on an optical disc 1 is divided into a plurality of zones.

FIG. 2 is a conceptual diagram showing a periodic wobble of a track groove on the optical disc 1;

FIG. 3 is a conceptual diagram of a wobble state of a track indicating a bit “0” of address information according to an embodiment of the present invention.

FIG. 4 is a conceptual diagram of a wobble state of a track indicating a bit “1” of address information according to an embodiment of the present invention.

FIG. 5 is a conceptual diagram illustrating the configuration of address information using the data formats of FIGS. 3 and 4.

FIG. 6 is a conceptual diagram of a wobble state of a track showing a data format of address information according to a second embodiment of the present invention.

FIG. 7 is a table showing a relationship between each zone of address information and a combination (A, B) indicating address information of this zone in the second embodiment of the present invention.

FIG. 8 is a conceptual diagram showing a configuration in which the phases of wobble tracks adjacent to each zone are substantially aligned.

FIG. 9 is a conceptual diagram showing a land & groove recording method on an optical disc.

[Explanation of symbols]

 1 optical disk 21,..., 2n zone L land G groove P pit T track groove Z zone

Claims (10)

[Claims] 1. A rewritable optical disk such as a phase-change medium or a magneto-optical medium or a write-once optical disk such as a dye-based medium, on which a spiral track for recording information or reproducing the recorded information is formed. A meandering portion formed by the track meandering in the radial direction of the optical disk and a non-meandering portion that is not meandering are continuously formed, and a combination of the meandering portion and the non-meandering portion allows the optical disc to be formed. An optical disc storing management information. 2. The address information of the storage area of the optical disk is represented by a combination (A, B) of a period A of the former meandering portion and a period B of the former non-meandering portion, and the address information is superimposed on the meandering of the previous track. 2. The optical disk according to claim 1, wherein the address management on the optical disk is performed by causing the address management. 3. In the address information, a bit “0” is represented by a combination of a meandering period A0 and a non-meandering period B0 (A0, B0), and the expression of the bit “1” is represented by a meandering value. The address information is expressed based on the combination (A0, B0) and the combination (A1, B1) of the combination of the partial period A1 and the non-meandering period B1. 3. The optical disc according to claim 1, wherein the address is superimposed on the meandering of the track to perform address management on the optical disc. 4. A configuration in which the value of the period obtained by adding the period A0 of the meandering portion and the period B0 of the non-meandering portion is equal to the value of the period obtained by adding the period A1 of the meandering portion and the period B1 of the non-meandering portion. The optical disk according to claim 3, wherein 5. The optical disc is constructed by dividing the track into a plurality of zones in a radial direction, and zone address information indicating an address of each zone is the address information superimposed on a meander of the track. The optical disk according to any one of claims 1 to 4, wherein the optical disk is indicated. 6. In the address information, a meandering period A and a non- meandering period B are made variable for each address, and the address information is expressed by a combination (A, B). The optical disk according to claim 1 or 2, wherein the address management on the optical disk is performed by superimposing the address on the optical disk. 7. The optical disk according to claim 6, wherein, in the combination (A, B), only the period A of the meandering portion is varied to express the address information. 8. The optical disc is configured by dividing the track into a plurality of zones in a radial direction, and zone address information indicating an address of each zone is the address information superimposed on a meandering of the track. The optical disk according to claim 6, wherein the optical disk is displayed. 9. The optical disc according to claim 1, wherein the meandering frequencies of the adjacent tracks in the zone are configured to have the same phase. 10. A meandering period A and a non- meandering period B are both set to values that are integral multiples of one meandering period of the track. An optical disk according to claim 9.