JP2000113465A - Optical disk - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk utilizing the physical format system, which is suitable for handling data of large quantity and also capable of easily securing the interchangeability with a ROM optical disk. SOLUTION: As the physical format constitution of the rewritable optical disk or the write-once optical disk, a spiral track for recording the information in the radial direction of the optical disk 1 or for reproducing the recorded information is divided to optional plural zones 21-2i (i is natural number). The track is formed so as to wobble in the radial direction of the disk. Track grooves are formed while superimposing the zone address to the wobble for each of the zones 21-2i based on the optional modulating method.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a phase change medium and an MO.
The present invention relates to a rewritable optical disk using a (magneto-optical) medium or the like and a write-once optical disk using a dye-based medium.

[0002]

2. Description of the Related Art DVDs (digital video discs) have been commercialized as large-capacity storage media for computers and the like. An optical disk used for DVD includes a DVD-ROM for reading data stored in advance by a user.
(Read only memory), a rewritable optical disk using a phase change medium such as a DVD-RAM (read-write memory), and a MO (magneto-optical) medium to which a user can write data, and one-time writing. Addition using possible dye-based media (write once)
Type optical disk.

[0003]

However, the physical formats in the storage areas of the DVD-RAM and DVD-ROM differ from each other in the following points, for example. The DVD-RAM has an ID indicating a sector address at the beginning of each sector in order to manage unallocated space.
(Identification) part is preformatted. In the DVD-RAM, the ID portions are arranged in a staggered manner in order to store data in both land tracks and groove tracks.

As described above, a DVD-RAM needs to manage a storage area in order to rewrite data, has a management function added thereto, and has a complicated format configuration. Format is very different. For this reason, there is no compatibility in the physical format configuration between the DVD-ROM and the DVD-RAM, and it is necessary to cope with the operation of detecting an address for reading data so that both can be reproduced on the drive device side.

[0005] The present invention has been made in view of such circumstances, and is particularly intended for use in a rewritable optical disk using a phase change medium or an MO medium or a write-once optical disk using a dye-based medium. It is another object of the present invention to provide an optical disk of a physical format suitable for handling large-capacity data such as audio data and capable of easily ensuring compatibility with a read-only optical disk.

[0006]

According to a first aspect of the present invention, there is provided a helical track for recording information or reproducing the recorded information.
In a rewritable optical disk such as a phase-change medium or an MO medium or a write-once optical disk such as a dye-based medium formed by dividing the track into zones in the radial direction, the track is formed so as to meander (wobble) in the radial direction of the disk. And the track is formed such that a zone address is superimposed and recorded on the wobble based on an arbitrary modulation rule for each of the divided zones.

The invention according to claim 2 is characterized in that the wobble is formed in a state where rotation is controlled by a CAV (Constant Angular Velocity) method in at least each zone.

According to a third aspect of the present invention, in the optical disk according to the second aspect, data is recorded on both a land portion and a groove portion of the track.

According to a fourth aspect of the present invention, in the optical disk according to any one of the first to third aspects, the minimum unit of file management is the zone unit.

According to a fifth aspect of the present invention, in the optical disk according to the fourth aspect, when data is recorded in an arbitrary zone, the remaining unrecorded area which is unnecessary for recording data in the arbitrary zone. Is recorded with any fixed data.

According to a sixth aspect of the present invention, in the optical disk according to any one of the first to fifth aspects, the number of divisions of the zone is arbitrarily set according to the type of data to be handled. I do.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows the configuration of the optical disk according to the first embodiment of the present invention. In FIG. 1A, an optical disk 1 is a rewritable optical disk such as a phase change medium or an MO medium, or a write-once optical disk such as a dye-based medium. Information is recorded in the radial direction of the optical disc 1 as a physical format configuration of these rewritable optical discs or write-once optical discs,
Alternatively, a spiral track for reproducing recorded information is divided into arbitrary zones 21 to 2i (i is a natural number).

The tracks are formed so as to meander (hereinafter referred to as wobble) in a radial direction of the disk at a predetermined period. Then, a track groove is formed while superimposing a zone address on a wobble based on an arbitrary modulation method for each of the zones 21 to 2i. Naturally, the same zone address is used in each zone. Here, as an arbitrary modulation method, for example, FM modulation used for a CD-R or the like is used. Of course, there is no problem even if another modulation method is used.

FIG. 2B shows an enlarged area Z in the zone 21 of the optical disk 1 shown in FIG. 1A.
As shown in the figure, tracks 3n and 3n + 1 are formed in the area Z so as to wobble at a predetermined period in the radial direction of the disk 1. 4 is a wobble. Each track includes a land portion L formed in a convex shape and a groove portion G formed in a concave shape. FIG. 2 shows a cross-sectional structure taken along section line XX of FIG.

In the present embodiment, when a track groove is formed while superimposing the zone address of each zone on the wobble based on an arbitrary modulation method, at least in each zone, a CAV (Constant Angular Velocity) is used.
The track groove is formed under the condition that the rotation is controlled by the disk drive device according to the method. By doing so, the modulation pattern of the wobble between the adjacent tracks becomes the same in all regions in the zone. Therefore, it is possible to detect the wobble modulation data without crosstalk from the adjacent track in both the land portion and the groove portion of the track.

Further, in this embodiment, since the wobble has the same phase in the adjacent track, the width of the land portion and the groove portion is kept constant, and both the land portion and the groove portion maintain a fixed track pitch. Therefore, data can be recorded on both the land portion and the groove portion of the track.

When data is recorded on the optical disk 1 formatted as described above, file management may be performed using the minimum unit of file management as a zone unit. In particular, in a system that handles a large amount of data such as image data and audio data, file management becomes easy, a system with extremely high operability can be constructed, and it can be said that this is an extremely effective format configuration.

FIG. 3 shows the configuration of an optical disk according to the second embodiment of the present invention. The optical disc according to the present embodiment is different from the optical disc according to the first embodiment in configuration in that the optical disc according to the present embodiment is arbitrarily set according to the type of data handling the number of divisions of the zone. This is the point, and the other configuration is the same, so the duplicate description will be omitted.

In FIG. 3, for example, when image data is mainly handled, one file is large.
As shown in FIG. 2A, an optical disk 10 having a format configuration in which the number of divisions of the zone 2 is small is prepared, and an optical disk 20 having a format configuration in which the number of divisions of the zone 2 is larger is prepared when mainly handling general code data. By doing so, a system with high utilization efficiency can be constructed. If a plurality of types of optical disks having different numbers of zone divisions are prepared according to the type of data handled in this way, ideal format characteristics can be obtained.

In the case where data is recorded in an arbitrary zone of the optical disk, if there is a remaining unrecorded area of one zone or less which is unnecessary for recording data in the arbitrary zone, the data is recorded in the unrecorded area. Record any fixed data. Specifically, as shown in FIG. 4, when data DATA1 is recorded on the optical disc, an arbitrary fixed data is recorded in an unrecorded area URA in which data is not recorded in zone Zn which is the last zone in the recording area of data DATA1. Are configured to be recorded together. Thereafter, when new data DATA2 is recorded, the recording is started from the zone Zn + 1 next to the zone Zn.

With such a configuration, in the optical disk according to the present embodiment, the previously recorded data and the newly recorded data are continuous without any break. Compatibility can be ensured for a physical format, such as an optical disk, on which it is a premise that data is continuously formed.

[0022]

As described above, according to the first aspect of the present invention, there is provided a spiral track for recording information or reproducing the recorded information. In a rewritable optical disk such as a phase change medium or an MO medium or a write-once optical disk such as a dye-based medium formed by zone division, the track is formed so as to meander in a wobble of a predetermined period in a radial direction of the disk, and Because the track is formed such that a zone address is superimposed and recorded on the wobble based on an arbitrary modulation rule for each of the divided zones,
Since the file management of the track can be performed on a zone basis, a physical format suitable for a large-capacity optical disk having an extremely simple and inexpensive configuration can be realized.

According to the second aspect of the present invention, at least in each zone, the wobble is formed under the condition that the rotation is controlled by the CAV (Constant Angular Velocity) method, so that the crosstalk from the adjacent track is generated. Without being affected, both land and groove parts,
It becomes possible to detect the zone address information superimposed on the wobble.

Since the wobble has the same phase in adjacent tracks, the width of the land and the groove is always kept constant, and both the land and the groove can maintain a constant track pitch. .

According to the third aspect of the present invention, since data is recorded on both the land portion and the groove portion of the track, the track density can be increased and the capacity can be increased. A suitable optical disk physical format can be realized.

According to the fourth aspect of the present invention, since the minimum unit of file management is the zone unit, a system with extremely high operability when handling large-capacity data such as image data and audio data is constructed. be able to.

According to the fifth aspect of the present invention, when data is recorded in an arbitrary zone, arbitrary fixed data is recorded in the remaining unrecorded area unnecessary for recording data in the arbitrary zone. With this configuration, the already recorded data and the newly recorded data are continuously connected without interruption. For example, it is easy to ensure compatibility with the physical format of a read-only optical disc. Becomes possible.

According to the invention described in claim 6, the number of divisions of the zone is arbitrarily set according to the type of data to be handled. Instead, it can be applied to a system that handles general code data and the like.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration of an optical disc according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a partial cross-sectional structure of the optical disk taken along the line XX in FIG.

FIG. 3 is an explanatory diagram showing a configuration of an optical disc according to a second embodiment of the present invention.

FIG. 4 is an explanatory diagram showing a recording system for ensuring compatibility of physical formats between optical disks having different physical formats.

[Explanation of symbols]

 1, 10, 20 optical disks 2 zones 3 tracks

Claims (6)

[Claims] 1. A rewritable optical disk such as a phase-change medium or an MO medium having a spiral track for recording information or reproducing the recorded information, wherein the track is divided into zones in the radial direction. In a write-once optical disc such as a dye-based medium, the track is formed so as to meander (wobble) in a radial direction of the disc, and a zone address is assigned to each of the divided zones based on an arbitrary modulation rule. An optical disc, wherein the track is formed so as to be superimposed and recorded on the optical disc. 2. At least in each zone, CAV (Consta
2. The optical disc according to claim 1, wherein the wobble is formed under a state where the rotation is controlled by an nt angular angular velocity method. 3. The optical disk according to claim 2, wherein data is recorded on both a land portion and a groove portion of the track. 4. The optical disk according to claim 1, wherein a minimum unit of file management is the zone unit. 5. When recording data in an arbitrary zone,
The optical disk according to claim 4, wherein arbitrary fixed data is recorded in a remaining unrecorded area that is unnecessary for data recording in the arbitrary zone. 6. The method according to claim 1, wherein the number of divisions of the zone is arbitrarily set according to the type of data to be handled.
An optical disc according to any one of claims 1 to 5, wherein