JP2003272177A - Partial-ROM TYPE OPTICAL DISK - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a Partial-ROM type optical disk that can be manufactured without a pre-pit and sacrificing a user data area. <P>SOLUTION: The optical disk DS is a rewritable optical disk or a write-once type optical disk. A wobble track WT1 is provided onto the surface of the optical disk DS, and user data are recorded along the wobble track WT1. The wobble means meandering and indicates an structure that the tracks are formed in a radial direction of the optical disk DS in a meandering manner. The wobble track WT1 has wobble parts AWT that are wobbled and non-wobble parts NWT that are not wobbled as shown in Figure. Partial-ROM data are recorded on tracks through the combination of the wobble parts AWT and the non- wobble parts NWT. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a phase change medium and an M
The present invention relates to a rewritable optical disc using an O medium or the like, or a write-once optical disc using a dye-based medium, etc., and particularly to a Partial-ROM optical disc in which data is stored in a part of the disc in advance.

[0002]

2. Description of the Related Art A general structure for realizing a Partial-ROM optical disk occupies a part of the inner or outer circumference of the disk as an area for storing Partial-ROM data, as shown in FIG. It was done like this. The Partial-ROM data storage method has a pre-pit structure in which pits (physical holes) are formed in the disk manufacturing process, as in a normal ROM disk.

[0003]

However, the above-mentioned Partial-ROM type optical disc has the following problems. The area (capacity) for recording user data is sacrificed. There are different types of prepits and track grooves on one disk. Also, the optimum conditions for reproducing data for the pre-pit part (pit depth, width, etc.) and the optimum conditions for track groove part for recording / reproducing user data (track groove depth, width, etc.) are naturally On the contrary, in practice, it is extremely difficult to make a disc that meets both optimal conditions.
Mostly in the past, Partial-RO was mainly due to the above two reasons.
M-type optical disks have not been put to practical use.

The present invention has been made in consideration of such circumstances, and its purpose is to avoid the sacrifice of the user data area and to determine the optimum conditions of the Partial-ROM area and the user data area. It is to provide a Partial-ROM type optical disc which can completely eliminate the difficulty of disc production due to the difference.

[0005]

The present invention has been made to solve the above problems, and the invention according to claim 1 has a track for recording user data,
Rewritable optical disks such as phase change media and magneto-optical media,
Alternatively, in a write-once optical disc such as a dye-based medium, a track groove for recording data is formed while wobbled in the radial direction of the optical disc, and the wobble of the track groove is modulated to form Partial-ROM data. Is a Partial-ROM type optical disc.

According to a second aspect of the present invention, in the Partial-ROM type optical disc according to the first aspect, the information recorded by the modulation of the wobble of the track groove includes an ID portion including address information and error detection or error. It is characterized by including information for correction. According to a third aspect of the present invention, in the Partial-ROM type optical disc according to the second aspect, the information of the ID portion including the address information is used at the time of recording, reproducing, and reproducing Partial-ROM data of user data. It is characterized by being possible.

According to a fourth aspect of the present invention, in the Partial-ROM type optical disc of the first aspect, two modulation methods are used to modulate the wobble of the track groove, and two wobbles are used depending on the wobble of the track groove. It is characterized by recording independent information. According to a fifth aspect of the present invention, in the Partial-ROM type optical disc according to the fourth aspect, the two modulation methods are amplitude modulation and phase modulation.

According to a sixth aspect of the present invention, in the Partial-ROM type optical disc according to the fourth aspect, the two modulation methods are frequency modulation and phase modulation. According to a seventh aspect of the present invention, in the Partial-ROM type optical disc according to any one of the fourth to sixth aspects, at least user data is recorded / reproduced by one of the two modulation methods. The ID part including the address information of the optical disc used at the time of is recorded, and at least Partial-R0M data is recorded by the other modulation method. The invention described in claim 8 is the Partial-ROM optical disk according to claim 7, wherein the Par
When the tial-ROM data is reproduced, the ID including the address information of the optical disc used for recording and reproducing the user data
It is characterized in that the information of the department can be used.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a configuration of an optical disc according to the same embodiment. Optical disc DS
A track is provided on the surface of, and Partial-ROM data is recorded in advance along this track. Then, the user data is superposed and recorded on the track on which the Partial-ROM data is recorded.

More specifically, the optical disc DS is, for example, a DVD-RAM or a CD-R using a phase change medium.
It is a rewritable optical disc such as an MO disc using a W or MO medium, or a write-once optical disc such as a CD-R using a dye-based medium. As shown in the figure, a wobble track WT1 is provided on the surface of the optical disc DS, and user data is recorded along the wobble track WT1. Here, the wobble means a meander, and indicates a structure in which tracks are meandered in the radial direction of the optical disc DS.
However, as shown in the figure, the wobble track WT1 includes a wobbled wobble portion AWT and a non-wobbled non-wobble portion NWT. Partial-ROM data is recorded on the track by a combination of the wobble portion AWT and the non-wobble portion NWT. For example, as shown in FIG.
1 "is recorded by a track that does not include the non-wobble portion NWT, and bit" 0 "is recorded by a track that partially includes the non-wobble portion NTW.

FIG. 3 is a diagram showing a recording format of the above-mentioned wobble track, which is an ID section represented by address information, a Partial-ROM data section, an error detection section (CRC) or an error correction section (ECC). Is provided. Here, the ID part can be used not only for the Partial-ROM data but also for recording and reproducing user data.

FIG. 2 is an enlarged view showing the detailed structure of the wobble track WT1 on the optical disc DS. A meandering track groove T is provided on the surface of the optical disc DS, the bottom of the track groove T is called a groove G, and a portion sandwiched between adjacent track grooves T is called a land L.
The waviness (meander) of the track groove T is called a wobble. When user data is recorded on the optical disc DS by using the land & groove recording method, recording marks P are formed on both the land L and the groove G. Also,
When the user data is recorded by the groove recording method, the recording mark P is formed only on the groove G. Then, to read the recorded data, the optical disc DS
Light H is incident from the bottom surface of the.

Next, a second embodiment of the present invention will be described. In the second embodiment, two types of information are recorded by the wobble described above. That is, FIG. 4 is a diagram showing the recording state of the wobble tracks formed on the optical disc DS. Two types of information are recorded on the optical disc DS. The first information is amplitude-modulated as shown by (b) in the figure.
Specifically, the bit "0" forming the first information includes a wobble portion and a non-wobble portion where the amplitude value of the wobble is near 0 for a certain period, and the bit "1" includes only the wobble portion. Further, the length (period) of the non-wobble portion is set to an integral multiple (for example, 1 or 2) of the wobble period in the wobble portion. By setting in this way, the optical disc can be easily manufactured, and the PLL control system in the device for reading the wobble can be stably operated. Furthermore, the non-wobble part in FIG. 4B is arranged so as not to coincide with the transition time of the data bit string.

The second information is recorded by phase modulation. That is, the bit forming the second information is "1".
Only when, for the waveform of the wobble of the previous bit,
The phase is shifted 180 degrees. A combination of the first information and the second information is the waveform shown in (g) of FIG. 4, and this waveform is the wobble track waveform of the optical disc. Therefore, two types of information are superposed and recorded on this wobble track. With such a track configuration, the amplitude modulation and the phase modulation can be demodulated extremely easily without adversely affecting each other. That is, the amplitude modulation and the phase modulation can be handled separately.

FIG. 5 is a diagram showing a wobble track format in the second embodiment. As shown in this figure, in the second embodiment, as the above-mentioned first information, an ID section and an error detection section (CRC) represented by address information used for recording / reproducing user data are represented. ) Or an error correction section (ECC) is arranged, and as the second information, the Partial-ROM data section,
Error detection unit (CRC) or error correction unit (EC
C) is recorded.

The ID section can be used not only when recording and reproducing user data, but also when reproducing Partial-R0M data. As described above, in the second embodiment of the present invention, the maximum capacity of Partial-ROM data can be stored on the wobble track, which is suitable for extremely large capacity. It is possible to provide a Partial-ROM type optical disc. In the above embodiment, wobble amplitude modulation and phase modulation are used, but the modulation method is not limited to these, and any modulation method such as frequency division modulation may be used.

[0017]

According to the first aspect of the present invention, as shown in FIG. 6, there is an effect that the Partial-ROM data can be recorded without consuming the area in which the user data is connected. Also, because Partial-ROM data can be recorded without pre-pits, it is possible to easily manufacture Partial-ROM type optical disks without being affected by the difficulty of disk manufacturing due to the difference in the optimum conditions between the Partial-ROM area and the user data area. be able to. According to the invention of claim 2, Part
The disk format in ial-ROM can be provided very easily.

According to the third aspect of the present invention, it is possible to very easily provide a disk format in which the address information and the like can be used both when reproducing the Partlal-ROM data and when recording and reproducing the user data. According to the invention of claim 4, the wobble track groove can be used in addition to the partial-ROM data storage.

According to the inventions of claims 5 and 6,
The wobble track groove can be used in addition to the Partial-ROM data storage with an extremely simple configuration. Claim 7
According to the invention, the capacity for storing Partial-ROM data can be maximized. According to the invention of claim 8, the capacity for storing the Partial-ROM data can be maximized, and the address information and the like can be stored in the Partial-R0M.
It is possible to provide a disk format that can be used for both data reproduction and user data recording / reproduction extremely easily.

[Brief description of drawings]

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

FIG. 2 is an enlarged perspective view showing the configuration of tracks on the optical disc in FIG.

FIG. 3 is a diagram showing a format of data recorded on the optical disc of FIG.

FIG. 4 is a waveform diagram showing a wobble signal recorded on an optical disc track according to a second embodiment of the present invention.

FIG. 5 is a diagram showing a format of data recorded on an optical disc track of the second embodiment.

FIG. 6 is a diagram for explaining the effect of the present invention.

FIG. 7 is a diagram for explaining a recording state of conventional Partial-ROM data.

[Explanation of symbols]

DS ... Optical disc WT1 ... Wobble track AWT ... wobble section NWT ... Non-wobble part

Claims (8)

[Claims] 1. A rewritable optical disc such as a phase change medium or a magneto-optical medium having a track for recording user data, or a write-once optical disc such as a dye-based medium, the track groove for recording data. Of the Partial-ROM
Partial-ROM type optical disk characterized by recording data. 2. The Partial- according to claim 1, wherein the information recorded by the wobble modulation of the track groove includes an ID portion including address information and information for error detection or error correction. ROM type optical disc. 3. The information of the ID section including the address information is recorded in user data, reproduced, and Partial-ROM.
The Partial-ROM type optical disc according to claim 2, which is usable during data reproduction. 4. The Partial-ROM according to claim 1, wherein two modulation methods are used as a method for modulating the wobble of the track groove, and two independent information are recorded by the wobble of the track groove. Type optical disc. 5. The Partia according to claim 4, wherein the two modulation methods are amplitude modulation and phase modulation.
l-ROM type optical disc. 6. The Part according to claim 4, wherein the two modulation methods are frequency modulation and phase modulation.
ial-ROM type optical disc. 7. An ID section including address information of the optical disk used for recording and reproducing user data is recorded by one of the two modulation methods, and at least Partial-R0M data is recorded by the other modulation method. 7. The Partial-ROM type optical disc according to claim 4, wherein: 8. When reproducing the Partial-ROM data,
8. The Partial-ROM type optical disc according to claim 7, wherein the information of the ID portion including the address information of the optical disc used when recording and reproducing user data can be used.