JP2000195060A - Optical disk and optical disk-driving apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk having a physical format system which is appropriate to handle data of a large capacity such as image and audio data or the like and can easily secure compatibility to a read-only type optical disk. SOLUTION: An optical disk 1 is a reload type optical disk such as a phase change medium, an MO(magneto-optic) medium or the like, or a write-once type optical disk such as a pigment-based medium or the like. A physical format of these disks is constituted so that a track 2 is divided to a plurality of zones 21-2n in a radial direction of the optical disk 1. The tracks 2 for recording data are formed to serpentine wobbling with an optional constant cycle set different for each divided zone in the radial direction of the optical disk 1.

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 an optical disk and an optical disk drive such as a rewritable optical disk using a (magneto-optical) medium or a write-once optical disk using a dye-based medium.

[0002]

2. Description of the Related Art DVDs (digital video disks) have been commercialized as large-capacity storage media for computers. Optical discs used for DVDs include a DVD-ROM (read only memory) for reading data stored in advance by a user and a phase change medium to which the user can write data, such as a DVD-RAM (read-write memory as needed). And a rewritable optical disk using a MO or MO medium and a write-once optical disk using a one-time writable dye-based medium. FIG. 6 shows a conventional read-only optical disk (DVD-
ROM). FIG. 1 shows a conventional read-only optical disk 50 on which pre-pit strings are formed. In FIG. 6A, the data recording area 52 of the optical disk 50 is enlarged, and the pre-pit rows are linearly arranged in the circumferential direction of the optical disk 50 as shown in FIG.

FIG. 7 shows a physical format of a conventional read-only optical disk in which pre-pit rows are arranged as described above. In this physical format, the minimum unit of file management is one frame (sector). When each frame indicates a sector address as address information at the beginning, this ID
Data section where data is written following the section (DATA)
This frame is formed continuously as a pre-pit row over the entire circumference of the optical disk 50 (FIG. 6).

[0004]

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.
Also, 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, in the DVD-RAM, it is necessary to manage a storage area in order to rewrite data. This management function is added, and the DVD-RAM has a complicated format structure. 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 the operation of detecting an address for reading data can be performed on both sides of the optical disk drive that drives the optical disk. Need to respond.

The present invention has been made in view of such circumstances, and is particularly suitable for handling large-capacity data such as image and audio data, and can easily ensure compatibility with a read-only optical disk. Optical disks such as a rewritable optical disk using a phase change medium or MO (magneto-optical) medium in a physical format, or a write-once optical disk using a dye-based medium, and an optical disk drive for driving this optical disk The purpose is to provide.

[0007]

According to one aspect of the present invention, there is provided a phase change medium having a spiral track for recording information or reproducing the recorded information. Rewritable optical disks such as MO media,
Or in an optical disc such as a write-once optical disc such as a dye-based medium, the track is divided into a plurality of zones in the radial direction of the optical disc, and a track for recording data is formed in the radial direction of the optical disc. It is characterized in that it is formed of wobble of an arbitrary fixed period different in setting for each of the divided zones.

According to a second aspect of the present invention, in the optical disk according to the first aspect, at least the inside of each zone is C
The wobble is formed in a state where rotation is controlled by an AV (Constant Angular Velocity) method, and
It is characterized in that the phases of the wobble in the adjacent tracks are substantially matched.

According to a third aspect of the present invention, there is provided a driving means for rotating the optical disk according to any one of the first and second aspects, and the driving means for rotating the optical disk at an arbitrary constant rotational speed. Rotation control means for controlling means, frequency detection means for detecting a frequency of a wobble signal generated based on a wobble cycle formed for each zone of the optical disc, and a wobble signal detected by the frequency detection means. Address detecting means for detecting an address for specifying the zone based on a frequency.

According to a fourth aspect of the present invention, there is provided a driving means for rotating and driving the optical disk according to any one of the first to second aspects, and a period of a wobble formed for each zone of the optical disk. Frequency detecting means for detecting the frequency of the wobble signal generated by the driving means, rotational speed detecting means for detecting the rotational speed of the driving means, and synchronizing the optical disk with the frequency of the wobble signal based on the detection output of the frequency detecting means. A rotation control unit that controls the driving unit so as to cause the rotation unit to detect an address that specifies the zone based on a rotation speed of the driving unit detected by the rotation speed detection unit. I do.

According to a fifth aspect of the present invention, in the optical disk according to any one of the first and second aspects, when data is recorded, address information for specifying each zone is recorded in a leading recording area of each zone. It is characterized by being recorded.

The invention described in claim 6 is the first invention.
2. The optical disk according to any one of items 2 and 5, characterized in that the optical disk has a physical format in which the minimum unit of file management of recording data is the zone unit.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows the configuration of an optical disk according to an embodiment of the present invention. In FIG. 1, 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. As the physical format configuration of these rewritable optical disks and write-once optical disks,
The track 2 is divided into a plurality of zones 2 in the radial direction of the optical disc 1.
Divide into 1 to 2n.

The track 2 for recording data is meandering in the radial direction of the optical disk 1 with a swell (hereinafter referred to as a wobble) having an arbitrary constant period different for each of the divided zones. It is formed as follows. Here, in this specification, information (wobble signal) generated when the optical disc 1 is rotated at a constant rotation speed and obtained by a wobble having a different arbitrary period set for each zone formed on a track is obtained. The detected frequency is called a wobble frequency. As shown in FIG. 2, wobble of each track is formed at a predetermined cycle so that different wobble frequencies F1 to Fn are detected for tracks belonging to each of the zones 21 (Z1) to 2n (Zn).

The track 2 is not shown, but
It comprises a concave land track (hereinafter, referred to as a land portion) and a convex groove track (hereinafter, referred to as a groove portion) when viewed from the incident direction of light used for recording and reproducing data.

When a wobble is formed on the optical disc 1, at least in each zone, wobble is formed under the condition that the optical disc is rotationally controlled by a CAV (Constant Angular Velocity) system by an optical disc driving device, and adjacent to the wobble. The wobbles are formed so that the phases of the wobble in the tracks substantially coincide with each other. With such a configuration, a fixed track pitch can always be ensured for both the land portion and the groove portion of the track, and so-called land / groove recording for recording data in the land portion and the groove portion can also be realized.

FIG. 3 shows the configuration of the optical disk drive according to the first embodiment of the present invention. In FIG. 1, an optical disk drive 10 includes a spindle motor 12 that drives the optical disk 1 to rotate, a spindle motor rotation controller 14 that controls the number of rotations of the spindle motor, an optical disk 1
An optical head 16 for detecting a wobble signal generated based on the wobble recorded on the track, a wobble frequency detector 18 for detecting the frequency (wobble frequency) of the wobble signal detected by the optical head 16, A zone address detection unit 20 that detects an address specifying a zone (hereinafter, referred to as a zone address).
And

The zone address detection section 20 has a storage section in which a table indicating a relationship between a zone address indicating each zone on the optical disc 1 and a wobble frequency set for each preset zone is stored. The zone address is detected based on the wobble frequency detected with reference to the table stored in the storage unit. The table is obtained by, for example, replacing the zone number with the zone address in FIG.

Here, the spindle motor 12 is a driving unit of the present invention, the spindle motor rotation control unit 14 is a rotation control unit of the present invention, the optical head 16 and the wobble frequency detector 18 are a frequency detecting unit of the present invention, The zone address detectors 20 each correspond to an address detector.

In the above configuration, the spindle motor 12
Drives the optical disc 1 under the control of the spindle motor rotation control unit 14. The spindle motor rotation control unit 14 controls the spindle motor 12 so that the optical disc 1 is rotated at an arbitrary constant rotation speed.

As a result, the optical disk 1 is driven to rotate at an arbitrary constant rotational speed, and a wobble signal generated by the optical head 16 based on a wobble formed at a constant period different for each zone of the optical disk 1 is detected. .

The wobble frequency detector 18 is an optical head 1
6. The wobble frequency is detected from the wobble signal detected by step 6. The zone address detection unit 20 refers to a table indicating a relationship between a zone address and a wobble frequency set for each preset zone, and based on the wobble frequency detected by the wobble frequency detector 18, the optical head 16. The zone address that specifies the zone where is located is detected.

According to the optical disk drive of the present embodiment, a track is divided into a plurality of zones in the radial direction, and tracks for recording data have different settings for each of the divided zones. A spindle motor 12 for rotating and driving the optical disc 1 formed of a wobble having an arbitrary constant period is controlled by a spindle motor rotation controller 14.
Is controlled to an arbitrary constant rotational speed, and the wobble frequency is detected.Therefore, since the wobble frequency obtained from the wobble is naturally different for each zone, the wobble frequency is detected to detect the current optical head. Is 1
It is possible to know in which zone of the optical disk 1 the optical disk 6 is located.

FIG. 4 shows the configuration of an optical disk drive according to a second embodiment of the present invention. The optical disc driving apparatus according to the present embodiment is different from the optical disc driving apparatus according to the first embodiment in configuration in that the spindle motor rotation control unit 14 forms the spindle motor 12 on tracks of each zone of the optical disc 1. A frequency of a wobble signal generated when the optical disk 1 is driven to rotate by the wobble, that is, a point at which the optical disk 1 is controlled to rotate in synchronization with the wobble frequency; a rotation number detector 30 for detecting the rotation number of the spindle motor 12; A spindle motor that has a storage unit that stores a table indicating a relationship between the number of revolutions of the spindle motor 12 and the zone address of the optical disc 1 when rotating in synchronization with the wobble frequency; Address for specifying the zone in which the optical head 16 is located based on the number of rotations Is the point of providing a zone address detecting means 32 for detecting the Other configuration elements are the same, the description for the same elements are denoted by the same reference numerals, without redundant description. The rotation speed detector 30 is configured by, for example, an encoder or the like.

In the above configuration, the optical disc 1 is driven to rotate by the spindle motor 12 under the control of the spindle motor rotation controller 14. Wobble frequency detector 18
Detects the wobble frequency from the wobble signal detected by the optical head 16. The spindle motor rotation control unit 14 rotates the spindle motor 12 in synchronization with the frequency of a wobble signal generated when the optical disc 1 is rotationally driven by the wobble formed in the track of each zone of the optical disc 1, that is, the wobble frequency. Control. As a result, the rotation speed of the spindle motor 12 corresponding to one of the zone addresses stored in the storage unit in the zone address detection unit 32 is
0 will be detected.

The zone address detecting means 32 detects the rotation speed of the spindle motor 12 when rotating in synchronization with the wobble frequency based on the rotation speed of the spindle motor 12 detected by the rotation speed detector 30 and the zone address of the optical disc 1. Referring to the table showing the relationship between
Detects a zone address that specifies a zone where is located.

As described above, according to the optical disk drive of the present embodiment, the rotation control of the spindle motor 12 for rotating the optical disk 1 is performed in synchronization with the wool. Since the detected number of rotations of the spindle motor 12 is different, by detecting the number of rotations of the spindle motor 12 by the rotation detector 30, it is possible to know in which zone of the optical disk 1 the optical head 16 is currently located.

That is, according to each of the above-described embodiments, the address information can be detected without forming the address information on the optical disk by using pre-pits and the like, and as a result, the format utilization efficiency can be improved. Becomes

When data is recorded on the optical disc 1 as described above, if zone address information is recorded together at the head of each zone, the zone in which data has been recorded once will be Using the address information, it is possible to know in which zone the optical head 16 is currently located. This state is shown in FIG. FIG. 5 shows an ID section in which zone address information is recorded in each zone of the optical disc 1 in zone units, and data (DA) in which data is recorded.
(TA) section is provided. As can be seen from FIG. 5, the configuration is similar to the physical format of a conventional read-only type (ROM) disk that is extremely common sense. As a result, by using the present invention,
It is possible to provide an optical disk having a physical format that can easily ensure compatibility with a read-only optical disk.

When data is recorded on a disk formatted in this way, file management may be performed on a zone basis. This is especially true when dealing with large amounts of data, such as images and audio.
It can be said that the file management becomes easy and the format configuration is extremely effective.

[0031]

According to the first aspect of the present invention, 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, or In an optical disk such as a write-once optical disk such as a dye-based medium, the track is divided into a plurality of zones in a radial direction of the optical disk, and
A track for recording data is formed by a wobble having an arbitrary constant cycle different in setting for each of the divided zones in the radial direction of the optical disc, so that address information and the like are preformatted. Even if it is not, information on which zone on the optical disk the optical head is currently located can be known from the wool. As a result, it is not necessary to preformat the address information or the like as in the related art, so that an optical disc with extremely high format utilization efficiency can be obtained, and the cost can be naturally reduced.

According to the invention described in claim 2, according to claim 1
Wherein the wobble is formed in a state in which rotation is controlled by a CAV (Constant Angular Velocity) method in at least each zone, and the phases of the wobble in the adjacent tracks substantially match. Since the track pitch is formed, the track pitch can be formed to be constant in all tracks. For example, the present invention can be applied to a system that records data on both the land portion and the group portion of the track. According to the invention described in claim 3, the optical disk is rotated at an arbitrary constant rotational speed, a frequency of a wobble signal generated based on a wobble formed for each zone is detected, and the detected wobble signal is detected. By detecting the zone address that identifies the zone by frequency,
The zone address information of the optical disk can be detected with a very simple configuration.

According to the fourth aspect of the present invention, the address of the zone is detected by rotating the optical disk in synchronization with the wobble frequency and detecting the rotation speed of the optical disk at that time. The zone address information of the optical disk can be detected with a very simple configuration.

According to the fifth aspect of the invention, when data is recorded, the address information of the zone is recorded together at the head of each zone. By reproducing the address information of the zone recorded at the head of the head, the current position of the optical head can be known.

According to the sixth aspect, since the minimum unit of file management of recording data is set to the zone unit, an extremely simple file management system can be realized.
This makes it possible to provide an optical disk format most suitable for a system that handles a large amount of data such as image and audio data.

As described above, by using the present invention, it is possible to provide a physical format of an optical disk suitable for increasing the capacity.

[Brief description of the drawings]

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

FIG. 2 is a diagram showing a relationship between a zone number specifying each zone of the optical disc in FIG. 1 and a wobble frequency set in each zone.

FIG. 3 is a block diagram showing a configuration of an optical disk drive according to the first embodiment of the present invention for driving the optical disk shown in FIG. 1;

FIG. 4 is a block diagram showing a configuration of an optical disk drive according to a second embodiment of the present invention for driving the optical disk shown in FIG. 1;

FIG. 5 is an explanatory diagram showing an example of a physical format of the optical disc according to the embodiment of the present invention.

FIG. 6 is an explanatory diagram showing a configuration of a conventional read-only optical disc.

FIG. 7 is an explanatory view showing a physical format of the read-only optical disc shown in FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical disk 10 Optical disk drive 12 Spindle motor 14 Spindle motor rotation control part 16 Optical head 18 Wobble frequency detector 20 Zone address detection part 30 Revolution number detector 32 Zone address detection part

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, or a write-once optical disk such as a dye-based medium. In the above, the track may be divided into a plurality of zones in the radial direction of the optical disc, and a track for recording data may have any setting different for each of the divided zones in the radial direction of the optical disc. An optical disc characterized by being formed by a wobble having a constant period. 2. At least in each zone, CAV (Consta
2. The wobble is formed under the condition that the rotation is controlled by an nt angular angular velocity method, and the phases of the wobble in the adjacent tracks are formed to substantially coincide with each other. An optical disc as described. 3. A drive unit for rotating and driving the optical disk according to claim 1, and a rotation control unit for controlling the drive unit to rotate the optical disk at an arbitrary constant rotational speed. A frequency detecting means for detecting a frequency of a wobble signal generated based on a wobble cycle formed at a constant cycle different for each zone of the optical disc; based on a frequency of the wobble signal detected by the frequency detecting means And an address detecting means for detecting an address for specifying the zone. 4. A driving means for rotatingly driving the optical disk according to claim 1 or 2, wherein the driving means is generated based on a wobble period formed at a constant period different for each zone of the optical disk. Frequency detection means for detecting the frequency of the wobble signal; rotation number detection means for detecting the rotation number of the drive means; and synchronizing the optical disk with the frequency of the wobble signal based on the detection output of the frequency detection means. An optical disc comprising: a rotation control unit that controls the driving unit; and an address detection unit that detects an address that specifies the zone based on the rotation speed of the driving unit detected by the rotation speed detection unit. Drive. 5. The optical disk according to claim 1, wherein, when data is recorded, address information specifying each zone is recorded in a head recording area of each zone. 6. The optical disc according to claim 1, wherein the optical disc has a physical format in which the minimum unit of file management of recording data is the zone unit.