JP3961709B2 - Information recording medium - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a format structure of an information recording medium such as an optical disk, a magneto-optical disk, and a magnetic disk, and more particularly, to a configuration of an inspection result display unit provided in a management area.
[0002]
[Prior art]
In the ISO standard and the DVD standard, regarding the format structure of an information recording medium such as an optical disc, information on whether the data recording area has been inspected or the data recording area has not been inspected as quality assurance information of the information recording medium by the manufacturer. Is recorded in a management area provided in the data recording area, and more specifically, the entire data recording area is inspected in a 1-bit inspection result display portion provided in the management area. In this case, a flag “1” is set, and a flag “0” is set if the data recording area is not inspected.
[0003]
[Problems to be solved by the invention]
However, since this type of information recording medium in recent years has a huge recording capacity, in order to fully inspect the data recording area, it requires an inspection time of about 1 to several hours per side, and is a mass-produced product. It has become practically difficult to fully inspect this type of information recording medium at the production stage. For this reason, except for products that require particularly high reliability, for example, product inspection is often ended by sampling inspection such as inspection of information tracks every several tracks.
[0004]
However, as described above, in the information recording medium conforming to the ISO standard and the DVD standard, the area for recording the information on whether or not the sampling inspection is performed and the sampling inspection condition are not formatted at all. As with the information recording medium that has not been inspected at all, the information recording medium that has undergone the inspection must be flagged with “0” in the 1-bit inspection result display section provided in the management area. There is a problem that finer quality assurance cannot be performed.
[0005]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide an information recording medium having a format structure capable of performing finer quality assurance by a manufacturer.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides an information recording medium having a data recording area and a management area, wherein the management area has a disk certification flag area, and the data area is in the data area. Information indicating whether or not the entire recording area has been inspected, information about whether or not the data recording area has been subjected to sampling inspection, and sampling inspection conditions are recorded.
[0007]
Thus, there is a disk Certification flag area in the management area, to the flag area, the data recording area of whether the entire surface inspection information and whether the data recording area sampling inspection The configuration in which information and sampling inspection conditions are recorded enables a finer quality assurance by the manufacturer. Therefore, the user should select an appropriate information recording medium that suits the purpose of use. Various inconveniences caused by inadequate information recording medium to be used, such as an increase in running cost caused by using an over-quality information recording medium, or data processing caused by using an insufficient quality information recording medium A decrease in speed or the like can be prevented. Further, since the disk certification flag area, which is the inspection result display section, is provided in the management area, verification of the recording capacity of the user area can be avoided.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of an information recording medium according to the present invention will be described with reference to FIGS. 1 is a plan view of an information recording medium according to this embodiment, FIG. 2 is a cross-sectional view of the information recording medium according to this embodiment, and FIG. 3 is a format structure diagram of the information recording medium according to this embodiment. . This example is characterized in that the present invention is applied to an optical disk or a magneto-optical disk.
[0010]
As is apparent from FIGS. 1 and 2, the information recording medium 1 of this example includes a transparent substrate 2 made of a hard transparent material such as glass or plastic, and information formed on the preformat pattern forming surface of the transparent substrate 2. The recording layer 3 and the protective layer 4 covering the information recording layer 3 are formed.
[0011]
The transparent substrate 2 is formed in a disk shape having a center hole 2a, and a preformat pattern consisting of a set of fine concavo-convex patterns in a ring-shaped data recording area 5 excluding the innermost and outermost peripheral portions of the inner surface. 2b is formed in a spiral shape or a concentric shape centering on the center hole 2a. The format structure of the information recording medium 1 configured with the preformat pattern 2b will be described in detail later with reference to FIG.
[0012]
The information recording layer 3 is formed on the preformat pattern forming surface of the transparent substrate 2 over a slightly wider range than the data recording area 5. The information recording layer 3 can be a single layer structure consisting only of a recording film made of a required heat mode recording material or photon mode recording material, or a laminated structure consisting of a laminate of the recording film and another thin film. It can also be. That is, in FIG. 2, the information recording layer 3 is displayed as one layer, but it is not always necessary to form the recording layer made of only the required heat mode recording material or photon mode recording material in one layer. Accordingly, the information recording layer 3 can be configured by a laminate of the recording film and another thin film, for example, an inorganic dielectric film (enhancement film) or a metal reflection film.
[0013]
The protective layer 4 protects the information recording layer 3 from mechanical impact and chemical deterioration, and can be formed of any inorganic or organic material as long as it has low moisture permeability and high strength. However, since it is possible to form a required protective layer homogeneously and easily, it is particularly preferable to use an ultraviolet curable resin.
[0014]
Hereinafter, the format structure of the information recording medium 1 defined by the preformat pattern 2b will be described with reference to FIG.
[0015]
The format structure shown in FIG. 3 complies with the DVD (Digital Versatile Disc) standard, and the data recording area 5 is arranged on the inner circumference side of the information recording medium 1 as shown in FIG. Lead-in area (management area) 10, user area (data area) 20 where the user records and reproduces information, and lead-out area (management area) arranged on the outer periphery side of the information recording medium 1 ) 30, and the lead-in area 10 determines an emboss zone 11 in which predetermined information is preformatted on the transparent substrate 2 in the form of fine irregularities, and the reflectance of the information recording medium 1. A mirror zone 12 composed of a mirror surface and a rewritable data zone 13 capable of recording information on the information recording layer 3. The rewritable data zone area 13 is provided with “DMA1 & DMA2” which is a defect management area. As shown in FIG. 3B, the “DMA1 & DMA2” has two defect management areas “DMA1” and “DMA1”. “DMA2” and “reserved” as a spare area are alternately provided.
[0016]
As shown in FIG. 3C, the defect management area “DMA1” includes “DDS (Disc Definition Structure)” indicating the preformat format of the disc and “PDL (Primary Defect List) for writing initial defect information. ) ”And“ SDL (Secondary Defect List) ”for writing subsequent defect information, and the“ DDS ”guarantees the quality of the disc as shown in FIG. A 1-byte “Disc certification flag” area is provided, and the 1-byte “Disc certification flag” area displays an inspection result having a recording capacity of 2 bits or more, as shown in FIG. It includes a section 40, “User certification” for recording some guarantee information by the user, and a reserved area “reserved”. One bit of the inspection result display unit 40 can be assigned a “Disc manufacturer certification” area in the DVD standard, and the remaining 1 bit or more can be assigned a reserved area “reserved”. Recording of the inspection result information on the inspection result display unit 40 can be performed in the form of pre-pits or can be performed in the form of information recording on the information recording layer 6.
[0017]
The defect management area “DMA2” is configured in the same manner as the defect management area “DMA1” except that it does not have a recording area for the AB surface identification information F. Further, the lead-out area 30 is also provided with defect management areas “DMA3 & DMA4” similar to the defect management areas “DMA1 & DMA2”, and these defect management areas “DMA3” and “DMA4” are also identified as AB planes. Except for not having a recording area for information F, it is configured in the same manner as the defect management area “DMA1”.
[0018]
In the information recording medium 1 of this example, since the inspection result display unit 40 having a recording capacity of 2 bits or more is provided in the defect management area “DMA1” provided in the lead-in area 10, data is displayed on the display unit 40. Not only information on whether or not the recording area has been inspected, but also information on whether or not the data recording area has been subjected to sampling inspection, and the sampling inspection conditions, etc. can be recorded, enabling finer quality assurance by the manufacturer. This makes it possible to avoid various inconveniences caused by inappropriate information recording media to be used by users. Further, since the inspection result display unit 40 is provided in the lead-in area 10 which is a management area, it is possible to avoid a reduction in the recording capacity of the user area 20.
[0019]
Hereinafter, other exemplary embodiments of the information recording medium according to the present invention will be listed.
[0020]
(I) In the above embodiment, the inspection result display unit 40 is distributed in the “Disc manufacturer certification” area and the “reserved” area of the defect management area “DMA1” formed in the lead-in area 10. However, the gist of the present invention is not limited to this, and as shown in FIG. 4, the inspection result display unit 40 of 2 bits or more can be continuously provided only in the reserved area “reserved”. Further, as shown in FIG. 5, inspection result display units 40 of 2 bits or more can be distributed and provided in the reserved area “reserved”.
[0021]
(II) In the embodiment, the inspection result display unit 40 is provided in the “DDS” area of the defect management area “DMA1” formed in the lead-in area 10, but the gist of the present invention is not limited to this. The inspection result display unit 40 may be arranged in any area in the lead-in area 10 other than the mirror zone 12.
[0022]
(III) In the embodiment, the format structure conforms to the DVD standard. However, the gist of the present invention is not limited to this, and a format structure that does not conform to the DVD standard can be adopted. Also in this case, the same effect can be obtained by providing the inspection result display section 40 having a recording capacity of 2 bits or more in any management area formed in the lead-in area.
[0023]
(IV) In the above embodiment, the write-once type or rewritable type information recording medium provided with the information recording layer 3 has been described as an example. However, the gist of the present invention is not limited to this, and the information recording layer 3 can be applied to a read-only information recording medium provided with a reflective layer. In this case, the same effect can be obtained by recording the inspection result information recorded in the inspection result display unit 40 in the required management area in the form of pre-pits.
[0024]
(V) In the above embodiment, the optical disk or the magneto-optical disk has been described as an example. However, the gist of the present invention is not limited to this, and a magnetic disk provided with a magnetic layer as the information recording layer 3 or the like. It can be applied to other magnetic information recording media.
[0025]
(VI) In the above embodiment, the description has been made by taking the single-sided recording type information recording medium as an example. However, the gist of the present invention is not limited to this, and the information recording has two single-plate structures. Double-sided recording type information recording medium having a laminated structure formed by laminating a medium, and both sides of a single plate structure in which a first information recording layer and a second information recording layer are formed on both front and back surfaces of a single substrate The present invention can also be applied to a record type information recording medium.
[0026]
【The invention's effect】
In the present invention, there is a disk certification flag area in the management area, and information on whether or not the entire data recording area has been inspected and information on whether or not the data recording area has been subjected to sampling inspection are recorded in the flag area. since the configuration that are can be avoided with allowing finer quality assurance by manufacturers, in advance various inconveniences due to incorrect information recording medium to be used for the user. In addition, since the disk certification flag area , which is the inspection result display section , is provided in the management area, it is possible to avoid a reduction in the recording capacity of the user area.
[Brief description of the drawings]
FIG. 1 is a plan view of an information recording medium according to an embodiment.
FIG. 2 is a cross-sectional view of an information recording medium according to an embodiment.
FIG. 3 is a format structure diagram of an information recording medium according to an embodiment.
FIG. 4 is a format structure diagram of an information recording medium according to another embodiment.
FIG. 5 is a format structure diagram of an information recording medium according to still another embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Information recording medium 2 Transparent substrate 2a Center hole 2b Preformat pattern 3 Information recording layer 4 Protective layer 7
5 Data recording area 10 Lead-in area (management area)
11 Embossed zone 12 Mirror zone 13 Rewritable data zone 20 User area (data area)
30 Lead-out area (management area)
40 Inspection result display

Claims (1)

An information recording medium having a data recording area and a management area, wherein there is disk Certification flag area in the management area, to the flag area, the data recording area of whether the entire surface inspection information, and Information on whether or not the data recording area has been subjected to sampling inspection and sampling inspection conditions are recorded.

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