JP3071803B2 - Optical information recording medium - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an optical information recording medium such as an optical disk.

(Prior art)

2. Description of the Related Art A rotary optical information recording medium having a plurality of sectors for recording information is already known.

Usually, information is written in a "normal writing area". Then, for example, when a write error occurs in a sector, the same information is written to the first spare area of the track where the sector exists. At this time, if all of the first replacement area has already been used, the same information has been written to the second replacement area. However, if a situation such that the second spare area cannot be written due to scratches or the like occurs, the entire optical disc becomes unusable.

Therefore, the present applicant has proposed in Japanese Patent Application Laid-Open No. 63-70928 that a third replacement area is allocated.

However, the rotary optical information recording medium, in its manufacturing process, uneven thickness of the recording layer or reflective layer occurs in the radial direction, or there is uneven birefringence of the substrate, the groove of the pre-format, the width of the pit, Irregularities such as size and depth occur.

However, in the conventional optical information recording medium, there is no idea that the optical information recording medium itself corrects recording and signal disturbances caused by these irregularities.

〔Purpose〕

SUMMARY OF THE INVENTION It is an object of the present invention to provide an optical information recording medium having a configuration capable of correcting, by itself, a signal variation generated due to the above-described various "unevenness" occurring in a manufacturing process of the optical information recording medium.

〔Constitution〕

The present invention is directed to a rotary optical information recording medium having a plurality of sectors for recording information, in which the entire information recording area is divided into integers for each of a plurality of sectors, and each of the other sectors is provided at the beginning or end of the divided block. An optical information recording medium characterized by arranging a sector having a longer data section than the data section.

That is, according to the present invention, in a rotating optical information recording medium having a plurality of sectors for recording information, these sectors are divided into a plurality of first sector groups, and these first sector groups are further divided into a plurality of first sector groups. One for dividing into two sector groups and recording the alternative information for each of these second sector groups.
Alternatively, a plurality of first replacement areas are allocated, and one or a plurality of second replacement areas for recording all the replacement information common to the second sector group are allocated, and the replacement information common to the first sector group is allocated. Allocating one or more third replacement areas for recording the data, and arranging, at the beginning or end of the first sector group or the second sector group, a sector having a longer data section than the data section of each of the other sectors. An optical information recording medium characterized by the following.

In the sector having a long data portion, the address portion is preferably long.

In FIG. 1 schematically showing an information recording area of an optical desk according to the present invention, if sector numbers are 0 to Q, a second sector group consisting of m consecutive second sectors corresponds to one track. If this one track is defined as one unit of r units and is referred to as a first sector (hereinafter referred to as a segment), the entire arbitrary sector constituting a plurality of sectors on the optical disk is composed of S segments and (Q-
It comprises a third replacement area with (M + 1) first sectors. That is, a first replacement area is provided at the end of each second sector, and a second replacement area is provided at a boundary section that divides a segment (first sector) into arbitrary groups. A third replacement area is provided at the end of the last replacement position in the sector.

The divided blocks include the normal writing area and the first, second, and third replacement areas shown in FIG. 1, and 0, 1,..., L, and 1 + 1 in FIG. Each of them has an ID part and a DATA part.

The number S of segments is determined by the number of sectors on the optical disk.

Each segment is composed of r tracks, of which P (for example, pseudo track numbers 1 to P) include a “normal writing area”, and the remaining (r−P) tracks (for example, pseudo track number r) This is the second replacement area.

Each of the P tracks is composed of (l + 1) normal write sectors forming a "normal writing area" and (ml-1) first replacement sectors forming a first replacement area. .

Each sector is configured, for example, as shown in FIG. That is, there is an ID unit 100 having a portion in which the number of each sector is recorded in advance and a portion in which a code indicating whether or not several sectors are defective sectors can be written. When there is a data portion 200 for writing information with a gap from the ID portion 100, and adjacent to the data portion 200, when the sector is a replacement sector, it indicates which sector is the replacement sector. There is a replacement sector number section 300 (indicating the sector number where the replacement occurred).

In addition, the long ID portion at the end of the DATA portion in FIG. 1 is provided with two to several tens of times by repeating the normal ID information amount in order to prevent the ID portion from being damaged or defective and becoming unreadable. Preferably.

The area of the present invention is an area where most of the area is not written except in the unlikely event that the area is provided in several to several tens of places in the radial direction of the disk, so that the reflectance and the like in the radial direction of the disk can be improved. The variation is measured by the driving device in the above-mentioned area, and reading is performed so that the in-plane (radial) signal characteristics become constant, and an instruction for adjusting the writing power is stored in the driving device to stabilize the recording / reproducing characteristics. Used as an area. It can also be used as a test writing area when something unusual occurs in the drive device.

The conventional alternative sector is provided only up to the third replacement, but unless the disk is severely scratched, etc., a sufficient replacement amount but a medium containing important information is used. In the case where the data portion is damaged, the long sector area of the data portion of the present invention may be used.

Further, the details of the defect inspection information of the disk at the time of shipment may be recorded in the area in advance, or disk management information such as date and time of manufacture and conditions may be entered.

The length of the DATA part of the present invention is long in order to prevent the mixture of the address information signal in the track signal and the focus signal when calibrating the in-plane characteristic variation, and the preferable length is as follows. It is about 5 to 1000 times the conventional DATA section.

Note that writing and reading operations are described in
This is the same as the case of the invention of -70928.

〔effect〕

The present invention can monitor the unevenness of the signal due to the presence of the various unevennesses described above in the radial direction of the medium by using the long sector of the data section, and can correct the unevenness by comparing with the original signal in the vicinity. It can function as a high-quality optical information recording medium.

In addition, since the correction is possible as described above, it is possible to use even discs having irregularities in various manufacturing processes which cannot be used with the conventional type, so that the yield of the manufacturing process is dramatically increased. Improved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram schematically showing sectors of an optical information recording medium according to the present invention for each area, and FIG. 2 is a diagram showing a configuration of each sector.

Claims (1)

(57) [Claims] In a rotary optical information recording medium having a plurality of sectors for recording information, an entire information recording area is divided into integers for each of a plurality of sectors, and each of the divided blocks is added to the beginning or end of each divided block. An optical information recording medium characterized by arranging a sector having a longer data section than a data section of a sector.