JP2000251267A - Information recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain information storage medium having a format structure that can assure delicate quality control by a manufacturer. SOLUTION: An inspection result display area 40 having the storage capacity of 2-bit or more is provided within the 'DDS(Disk Definition Structure)' provided in the defect management areas 'DMA1 and DMA2' of a read-in area 10 preformatted in the information storage medium 1 and the information to check whether the data recording area is totally inspected or not to check whether the sampling inspection is performed to the data recording area or not and the sampling inspection condition or the like are recorded in this inspection result display area 40.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field 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 section provided in a management area.

[0002]

2. Description of the Related Art The ISO standard and the DVD standard relate to the format structure of an information recording medium such as an optical disk.
As the quality assurance information of the information recording medium by the manufacturer, it is determined that information as to whether the data recording area has been fully inspected or whether the data recording area has not been inspected is recorded in a management area provided in the data recording area. More specifically, in the 1-bit inspection result display section provided in the management area, a flag of “1” is set when the entire data recording area is inspected, and the inspection of the data recording area is not performed. In this case, a flag "0" is set.

[0003]

However, since such an information recording medium of recent years has an enormous recording capacity, an inspection time of about one to several hours per side is required to inspect the entire data recording area. This makes it practically difficult to perform a full inspection of this kind of mass-produced information recording medium at the production stage. For this reason, except for products that require particularly high reliability, product inspections are often completed by sampling inspections such as inspection of information tracks every few tracks.

However, as described above, in an information recording medium conforming to the ISO standard or the DVD standard, an area for recording information on whether or not a sampling test has been performed or a sampling test condition has not been formatted at all. As with the information recording medium on which the sampling inspection has been performed, the flag of "0" must be set on the 1-bit inspection result display section provided in the management area, similarly to the information recording medium on which the inspection has not been performed at all. However, there is a problem that it is not possible for a manufacturer to provide more detailed quality assurance.

[0005] The present invention has been made in view of the above circumstances, and an object thereof is to provide an information recording medium having a format structure that allows a manufacturer to perform more detailed quality assurance. It is in.

[0006]

According to the present invention, there is provided an information recording medium in which a management area and a user area are preformatted in a data recording area.
2 for displaying the inspection result at the time of manufacture in the management area.
An inspection result display unit having a recording capacity of more than bits is provided.

As described above, if the inspection result display section for displaying the inspection result at the time of manufacturing is configured to have a recording capacity of 2 bits or more, information as to whether or not the entire data recording area has been inspected can be recorded. In addition, since it is also possible to record information on whether or not the data recording area has been subjected to the sampling inspection and its sampling inspection conditions, it is possible for the manufacturer to provide more detailed quality assurance. For this reason, it is possible for the user to select and use an information recording medium of appropriate quality suitable for the purpose of use, and various inconveniences caused by inappropriate use of the information recording medium to be used, for example, by using an information recording medium of excessive quality It is possible to prevent an increase in running cost and a decrease in data processing speed caused by using an information recording medium of insufficient quality. Further, since the inspection result display section is provided in the management area, it is possible to avoid a decrease in the recording capacity of the user area.

The inspection result display section having the recording capacity of 2 bits or more can be continuously arranged in a specific area in the management area, or can be arranged separately in different areas. If there is room for the recording capacity in a specific area in the management area, the inspection result display unit can be continuously arranged. Can be avoided.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of an information recording medium according to the present invention will be described below with reference to FIGS. FIG. 1 is a plan view of an information recording medium according to the embodiment, FIG. 2 is a cross-sectional view of the information recording medium according to the embodiment, and FIG. 3 is a format structure diagram of the information recording medium according to the embodiment. . This embodiment is characterized in that the present invention is applied to an optical disk or a magneto-optical disk.

As is clear from FIGS. 1 and 2, the information recording medium 1 of this embodiment is formed on a transparent substrate 2 made of a hard transparent material such as glass or plastic, and on a preformat pattern forming surface of the transparent substrate 2. Information recording layer 3
And a protective layer 4 covering the information recording layer 3.

The transparent substrate 2 is formed in a disk shape having a center hole 2a, and is composed of a set of fine irregular patterns in a ring-shaped data recording area 5 excluding the innermost and outermost peripheral portions of the inner surface. The preformat pattern 2b is formed in a spiral or concentric shape centering on the center hole 2a. The format structure of the information recording medium 1 constituted by the preformat pattern 2b will be described later in detail with reference to FIG.

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 may have a single-layer structure composed of only a recording film made of a required heat mode recording material or a photon mode recording material, or a laminated structure composed 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 a single layer only with a recording film made of a required heat mode recording material or photon mode recording material. Accordingly, the information recording layer 3 may be formed of a laminate of the recording film and another thin film, for example, an inorganic dielectric film (enhancement film) or a metal reflection film.

The protective layer 4 protects the information recording layer 3 from mechanical shock and chemical deterioration, and is formed of any inorganic or organic material as long as it has low moisture permeability and high strength. However, it is particularly preferable to use a UV-curable resin because the required protective layer can be easily formed homogeneously.

Hereinafter, a format structure of the information recording medium 1 defined by the preformat pattern 2b will be described with reference to FIG.

The format structure shown in FIG.
(Digital Versatile Disc) standard, and as shown in FIG.
A lead-in area (management area) 10 arranged on the inner peripheral side of the information recording medium 1, a user area (data area) 20 where a user records or reproduces information, and an outer peripheral side of the information recording medium 1. Arranged lead-out area (management area) 3
The lead-in area 10 is used to determine the 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. Mirror Zone 1 consisting of mirror surfaces
2 and a rewritable data zone 13 in which information can be recorded on the information recording layer 3. The rewritable data zone area 13 is provided with a defect management area “DMA1 & DMA2”. As shown in FIG. 3B, this “DMA1 & DMA2”
Two defect management areas “DMA1” and “DMA2” and a reserved area “reserved” are provided alternately.

The defect management area "DMA1" is shown in FIG.
As shown in (c), “DDS (Disc Definition Structure)” indicating the preformat format of the disc
And "PDL (Primary
Defect List) and “SDL (Secondary Defect List)” for writing subsequent defect information, and the “DDS” includes, as shown in FIG. 1-byte "Disc"
certification flag ”area,
The "Disc certification flag" area of the byte is shown in Fig. 3.
As shown in (e), the inspection result display unit 40 having a recording capacity of 2 bits or more, “User certification” for recording some kind of certification information by the user, and the preliminary area “re”
served ". It should be noted that one bit of the inspection result display section 40 corresponds to “Di” in the DVD standard.
The "sc manufacturer certification" area can be assigned, and the remaining one or more bits can be assigned to the reserved area "reserved". The recording of the inspection result information on the inspection result display section 40 can be performed in the form of a pre-pit or in the form of information recording on the information recording layer 6.

The defect management area "DMA2" is also
The configuration is the same as that of the defect management area “DMA1”, except that it does not have a recording area for the AB surface identification information F. The lead-out area 30 is also provided with a defect management area "DMA3 &DMA4" similar to the defect management area "DMA1 &DMA2", and these defect management areas "DMA3" and "DMA4" are also AB side identification. The configuration is the same as that of the defect management area “DMA1” except that it does not have a recording area for the information F.

In the information recording medium 1 of the present embodiment, the defect management area "DMA1" provided in the lead-in area 10 is provided with the inspection result display section 40 having a recording capacity of 2 bits or more. In addition to the information on whether or not the data recording area has been fully inspected, information as to whether or not the data recording area has been subjected to sampling inspection and its sampling inspection conditions can be recorded. Quality assurance becomes possible, and various inconveniences due to improper use of the information recording medium used by the user can be avoided. In addition, since the inspection result display section 40 is provided in the lead-in area 10 which is a management area, a decrease in the recording capacity of the user area 20 can be avoided.

Hereinafter, other embodiments of the information recording medium according to the present invention will be listed.

(I) In the above embodiment, the defect management area "DMA1" formed in the lead-in area 10
Disc manufacturer certification area and reser
Although the inspection result display section 40 is provided separately in the “ved” area, the gist of the present invention is not limited to this. As shown in FIG. 4, only the reserved area “reserved” has two bits or more. The inspection result display section 40 can be provided continuously. In addition, as shown in FIG. 5, the inspection result display unit 40 of 2 bits or more can be provided in the reserved area “reserved” in a distributed manner.

(II) In the above embodiment, the defect management area "DMA1" formed in the lead-in area 10
The inspection result display section 40 is provided in the “DDS” area of the present invention, but the gist of the present invention is not limited to this.
The inspection result display section 40 can be arranged in an arbitrary area in the lead-in area 10 excluding the zone 12.

(III) In the above embodiment, the DV
Although the format structure conforms to the D standard, the gist of the present invention is not limited to this, and a format structure not conforming to the DVD standard may be adopted. 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 of the management areas formed in the lead-in area.

(IV) In the above embodiment, a write-once or rewritable information recording medium provided with the information recording layer 3 has been described as an example, but the gist of the present invention is not limited to this. The present invention can be applied to a read-only type information recording medium provided with a reflective layer instead of the information recording layer 3. In this case, the same effect can be obtained by recording the inspection result information recorded in the inspection result display section 40 in a required management area in the form of a pre-pit.

(V) In the above embodiment, an optical disk or a magneto-optical disk has been described as an example, but the gist of the present invention is not limited to this, and a magnetic layer is provided as the information recording layer 3. The present invention can be applied to a magnetic information recording medium such as a magnetic disk.

(VI) In the above embodiment, a single-sided single-sided recording type information recording medium has been described as an example.
The gist of the present invention is not limited to this, but is a double-sided recording type information recording medium having a laminated structure obtained by laminating two single-plate information recording media or a single-substrate front and rear surface. The present invention can also be applied to a double-sided recording type information recording medium having a single-plate structure in which the first information recording layer and the second information recording layer are formed.

[0026]

According to the first aspect of the present invention, an inspection result display unit having a recording capacity of 2 bits or more for displaying inspection results at the time of manufacturing is provided in the management area provided in the user area. In addition, in the inspection result display section, not only information as to whether or not the entire data recording area has been inspected, but also information as to whether or not the data recording area has been subjected to sampling inspection, sampling inspection conditions, and the like can be recorded. Therefore,
A more detailed quality assurance by the manufacturer can be achieved, and various inconveniences due to improper use of the information recording medium used by the user can be avoided. Further, since the inspection result display section is provided in the management area, it is possible to avoid a decrease in the recording capacity of the user area.

According to the second aspect of the present invention, since the inspection result display sections having a recording capacity of 2 bits or more are dispersedly arranged in different areas in the management area, it is possible to avoid waste of the management 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 the information recording medium according to the embodiment.

FIG. 3 is a diagram illustrating a format structure of an information recording medium according to an embodiment;

FIG. 4 is a diagram illustrating a format structure of an information recording medium according to another embodiment.

FIG. 5 is a diagram showing a format structure 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 Emboss zone 12 Mirror zone 13 Rewritable data zone 20 User area (data area) 30 Lead-out area (management area) 40 Inspection result display section

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Yoshihiro Ikari, 1-1-88 Ushitora, Ibaraki-shi, Osaka Hitachi Maxell, Inc. (72) Inventor Hitoshi Watanabe 1-188, Ushitora, Ibaraki-shi, Osaka Hitachi Maxell Co., Ltd. (72) Inventor Koichi Otsuka 1-88 Ushitora, Ibaraki City, Osaka Prefecture Hitachi Maxell Co., Ltd. F-term (reference) 5D044 DE03 DE17 DE48 5D090 BB04 BB10 CC01 CC14 CC18 DD03 DD05 FF11 GG17 GG32 HH08

Claims (2)

[Claims] 1. An information recording medium in which a management area and a user area are preformatted in a data recording area,
2 for displaying the inspection result at the time of manufacture in the management area.
An information recording medium comprising an inspection result display unit having a recording capacity of at least bits. 2. The information recording medium according to claim 1, wherein the inspection result display sections having a recording capacity of 2 bits or more are dispersedly arranged in different areas in the management area. recoding media.