JPH08339540A - Optical recording medium - Google Patents

Abstract

PURPOSE: To obtain an optical recording medium which can be improved in the reliability of address information reading-out by lessening the influence of the sector ID parts on information tracks on adjacent tracks. CONSTITUTION: The pit shapes of the sector mark parts 101 are inverted in ruggedness to each other on a land side (a) and a groove side (b). The pits of the ID data from VFO to CRC are formed on the land side (a) of the land side ID data parts 102 following the sector mark parts 101 and groove side spaces where there is no formation of the pits are formed on the adjacent groove side (b). The pits of the ID data are formed on the groove side (b) and the land side spaces where there is no formation of the pits are formed on the adjacent land side (a) in the succeeding groove side data parts 103. Then, the recording sections of the ID data are arranged and recorded by shifting these sections in the longitudinal direction of the tracks without overlapping each other on the adjacent land side (a) and the groove side (b).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical recording medium, and more particularly to an optical recording medium for recording / reproducing ID information on both the land side and groove side of a recording track when recording / reproducing data in sector units.

[0002]

2. Description of the Related Art In a conventional rewritable optical recording medium, particularly a disc-shaped optical recording medium (optical disk), an information track for recording / reproducing is provided on either the groove side or the land side between the grooves. Has become. For example, the International Organization for Standardization (ISO) / International Electrotechnical Commission (IEC) 10089 stipulates that the recording portion of a disc is either the land side or the groove side.

In the above-mentioned conventional optical disc, the sector ID portion containing the address information necessary for recording / reproducing data in sector units is located on either the land side or the groove side which is the same as the information track for recording / reproducing data. The crab is recorded in the format shown in FIG. 3, for example.

As shown in the figure, the sector ID is a sector mark 31 indicating that it is the beginning of a sector, a VFO 32 for generating a timing clock for reading the address information following the sector mark 31, and the subsequent data is the address information. Address mark 33 indicating that, the address information 34 in which the address of the existing sector is recorded, and the cyclic redundancy, which is an error check code for checking or correcting whether the read address information 34 is correct or not. The check code (CRC) 35 and the check code (CRC) 35 are combined in time series. Further, it is general to record the VFO 32 to the CRC 35 in double or triple in order to make reading more accurate.

Therefore, in the conventional optical disc, the sector I
Since data cannot be recorded in the recording portion of D, the recording capacity is limited by the sector ID recording. Therefore, since the outer edge of the light beam spot has hitherto hit the groove side or land side adjacent to the information track, attention has been paid to the fact that the reflected light from the optical disk contains information from the adjacent groove or land, and the There is proposed an optical disc in which pre-formatting is performed as a pit train in which address information is intermittently provided in a groove or land (for example, Japanese Patent Laid-Open No. 2-1666).
21).

[0006]

However, in the above-mentioned conventional optical recording medium, since the address information is recorded in the groove or land adjacent to the land or the groove which is the same as the information track, the same optical recording medium is used. The address information is reproduced together with the information from the information track by the beam spot, the address information is affected by the data reproduction from the information track, and the reliability of reading the address information is deteriorated.

Further, even when the reproduced signal of the sector ID signal recorded on the adjacent information track is mixed in the reproduced signal of the unrecorded sector, the unrecorded sector is similarly recorded on the basis of the signal reproduced as crosstalk. The reproducing apparatus operates as if the signal was recorded.

The present invention has been made in view of the above points,
An object of the present invention is to provide an optical recording medium capable of reducing the influence of a sector ID portion on an information track on an adjacent track and improving the reliability of reading address information.

[0009]

In order to achieve the above object, the present invention records a sector ID portion including address information necessary for recording / reproducing data in sector units on both the land side and the groove side. In the optical recording medium, a space is recorded in the groove adjacent to the land side recording section of the ID data of the sector ID section, and the I of the sector ID section is recorded.
A space is recorded on a land adjacent to the groove side recording section of D data.

The sector ID portion has a sector mark indicating the beginning of a sector and an I having address information.
The sector mark is composed of D data and a space, and is characterized in that the sector mark is recorded adjacent to the land side and the groove side in a fixed pattern that is inverted from each other, or is recorded without the sector mark.

[0011]

In the present invention, since the space is recorded on the groove side and the land side which are adjacent to the recording sections on the land side and the groove side of the ID data of the sector ID portion, the sector ID portion is recorded on the land side and the groove side. Even if the optical recording medium is recorded on both sides, the recording section can be prevented from adjoining the land side and the groove side with respect to the ID data.

When the sector mark is recorded, since the sector mark is recorded adjacent to the land side and the groove side in a fixed pattern which is reversed from each other, the sector mark is recorded on the land side or the groove side. It is possible to determine whether or not it has been done.

[0013]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 shows the format of a sector ID in an embodiment of the optical recording medium according to the present invention. The same figure (A) shows the format of the land side sector ID, and the same figure (B) shows the format of the groove side sector ID.

In this embodiment, sector IDs are recorded on both the land side and the groove side.
As shown in FIG. 1A, the format of D is a land-side VFO 12 that generates a timing clock for reading address information immediately after the land-side sector mark 11 that indicates the beginning of a sector, and the following data. Land-side address mark 1 indicating that is the address information
3. Land side address data 14 in which the address information of the existing sector is recorded, and land side CRC 15 for checking or correcting whether the read land side address data 14 is correct are sequentially combined in time series, and thereafter This is a configuration in which a land side space 16 having a fixed length and not recording anything continues.

On the other hand, as shown in FIG. 1B, the format of the groove side sector ID is such that nothing is recorded at a fixed length immediately after the groove side sector mark 21 indicating the beginning of the sector. A groove side space 22 follows, and then a groove side VFO 23 for generating a timing clock for reading groove side address information and the like,
It is checked or corrected whether the groove side address mark 24 indicating that the subsequent data is address information, the groove side address data 25 in which the address information of the existing sector is recorded, and the read groove side address data 25 are correct. This is a configuration in which the groove-side CRC 26 for is combined sequentially in time series.

The length of the land side space 16 is set to be equal to or longer than the length from the adjacent groove side VFO 23 to the groove side CRC 26, and the length of the groove side space 22 is set to the adjacent land side. VFO12
To the land side CRC15, or a length longer than that. Therefore, the portions from VFO to CRC (hereinafter referred to as ID data) necessary for reading the address information of each sector are alternately arranged without being adjacent to each other on the land side and the groove side.

Further, the land side sector mark 11 and the groove side sector mark 21 are set to fixed patterns in which the patterns are mutually inverted, which makes it easy to discriminate between the land side and the groove side by the optical disk device. I am making it.

Next, a pit model of the sector ID portion on the recording surface of the optical disc according to the embodiment of the present invention is shown in FIG.
Will be explained together. The pit shape of the sector mark portion 101 is such that the land side a and the groove side b have irregularities reversed from each other. That is, for example, when the sector mark 11 recorded on the land side a is a convex pit, the sector mark 21 recorded on the adjacent groove side b forms a concave pit.

Following the sector mark portion 101, the land side I
A D data section 102 is formed. This land side ID
The data section 102 has the VF shown in FIG.
Pits from O12 to CRC15 are formed, and a groove side space (22 in FIG. 1B) having no pit is formed on the adjacent groove side b.

A groove side data section 103 is formed following the land side ID data section 102. In the groove side data portion 103, pits from the VFO 23 to the CRC 26 shown in FIG. 1B are formed on the groove side b, and a land side space where no pit is formed on the adjacent land side a (FIG. 1A). 16) is formed.

A data portion is formed subsequent to the groove side ID data portion 103, and the sector mark portion 10 described above is formed.
1, a recording section (preformatted area) including a land side ID data section 102 and a groove side ID data section 103
May be repeated a plurality of times. In this optical disc, following the preformatted area formed as described above, data is alternately recorded and reproduced on the land side a and the groove side b every rotation of the optical disc.

In the optical disk device, it is determined whether the information track being read is on the land side or the groove side depending on whether the sector mark pattern is inverted, and the ID data read start timing is immediately determined when the land side read determination is made. When the groove side reading is determined, it is set after the period corresponding to the space has elapsed.

As described above, according to this embodiment, the recording section of the ID data does not overlap between the land side a and the groove side b which are adjacent to each other, and the track length direction (the disc rotating direction) is not overlapped.
The pit patterns from the VFO 12 (23) to the CRC 15 (26) for reading the address information are not adjacent to each other on the land side a and the groove side b, but are alternately arranged because they are arranged and recorded in a shifted manner. It is possible to prevent the influence of the reproduction of the ID data from the adjacent track as crosstalk and improve the reliability of reading the address information.

In the above embodiment, the sector mark is recorded in the current optical disk because the sector mark is required. However, the present invention is not limited to the above embodiment. Even if the land side or the sector side can be discriminated from the address information, and the information similar to the sector mark is included in the ID data, the recording of the sector marks 11 and 21 (formation of the sector mark portion 101) can be omitted. May be.

Although the ID data and the like are recorded in the form of concave and convex pits in FIG. 2, the information is changed depending on the reversal direction of the magnetization direction of the medium or the phase change state like a magneto-optical disk or a phase change type optical disk. It goes without saying that the present invention can be applied to an optical disc for recording the. Further, the shape of the optical recording medium is not limited to the disc shape.

[0026]

As described above, according to the present invention,
Optical recording for recording the sector ID portion on both the land side and the groove side by arranging and recording a space on the groove side and the land side adjacent to the land side and groove side recording sections of the ID data of the sector ID portion Even in the medium, since the recording sections are not adjacent to each other on the land side and the groove side for the ID data, the influence of the crosstalk due to the ID data from the adjacent groove or land is suppressed at the time of reading the sector ID to read the address information. The reliability can be improved as compared with the conventional one.

Further, according to the present invention, when the sector mark is recorded, the sector mark is recorded adjacent to the land side and the groove side in a fixed pattern which is mutually inverted, and is recorded on the land side by the pattern. Since it is determined whether the data is recorded on the groove side, the read start timing of the ID data can be optimally set in the recording / reproducing apparatus on both the land side and the groove side, and the reliability of the ID data read is improved. Can be improved.

[Brief description of drawings]

FIG. 1 is a sector ID format diagram according to an embodiment of the present invention.

FIG. 2 is a diagram showing a pit model of a sector ID portion according to an embodiment of the present invention.

FIG. 3 is a conventional sector ID format diagram.

[Explanation of symbols]

 11 land side sector mark 12 land side VFO 13 land side address mark 14 land side address data 15 land side CRC 16 land side space 21 groove side sector mark 22 groove side space 23 groove side VFO 24 groove side address mark 25 groove side address data 26 Groove side CRC 101 Sector mark part 102 Land side ID data part 103 Groove side ID data part a Land side b Groove side

Claims (3)

[Claims] 1. An optical recording medium in which a sector ID portion including address information required for recording / reproducing data in sector units is recorded on both the land side and the groove side, and ID data of the sector ID portion An optical recording medium is characterized in that a space is recorded in a groove adjacent to the land side recording section, and a space is recorded in a land adjacent to the groove side recording section of the ID data of the sector ID portion. 2. The sector ID portion is composed of a sector mark indicating the beginning of a sector, the ID data having address information, and the space, and the sector mark is a fixed pattern in which the sector marks are inverted from each other. The optical recording medium according to claim 1, wherein the optical recording medium is recorded adjacent to both the side and the groove side. 3. The optical recording medium according to claim 1, wherein the sector ID portion includes the ID data including address information and the space.