HK1083928A - Optical information recording medium - Google Patents

Abstract

The present invention provides an optical information recording medium capable of improving the coating of a chromatic solution on a substrate (2) and making the film forming performance of a chromatic layer (optical recording layer (3)) keep at a predetermined level to obtain optimum optical characteristics, ensure the characteristics of a first sub-information area (12), a second sub-information area (13) and a main information area (14) and have good production efficiency. Said optical information recording medium is characterized in that: the first sub-information area (12), the second sub-information area (13), and the main information area (14) are provided in order from the center of the optical information recording medium in an outer peripheral direction. A first groove (31) is formed in a first boundary area (17) between the first sub-information area (12) and the second sub-information area (13) and a second groove (32) is formed in a second boundary area (18) between the second sub-information area (13) and the main information area (14).

Description

Optical information recording medium

Technical Field

The present invention relates to an optical information recording medium, and more particularly, to an optical information recording medium for recording with a laser beam (blue laser beam) having a wavelength of 350 to 500 nm.

Background

Conventionally, optical information recording media for recording and reproducing optical information by laser light have been developed, and in addition to CDs using red laser light having a wavelength of 750 to 830nm (for example, around 780 nm), DVDs using red laser light having a short wavelength of 640 to 680nm (for example, around 650 to 665nm), and blue laser light having a short wavelength of 350 to 500nm (for example, around 405nm), blu-ray discs (BDs or HD-DVDs) capable of recording and reproducing high-density optical information at high speed have been developed.

The blu-ray disc (BD or HD-DVD) standard defines recording of sub information (BCA recording, pit train recording) which is different from the type of main information for data recording in the related art.

FIG. 5 is a schematic plan view of the optical information recording medium 1 of the Blu-ray disc (particularly, HD-DVD); fig. 6 is a schematic cross-sectional view thereof.

As shown in fig. 6, the optical information recording medium 1 includes: a light-transmitting substrate 2, an optical recording layer 3 (light-absorbing layer) formed on the substrate 2, an optical reflection layer 4 formed on the optical recording layer 3, a protective layer 5 (adhesive layer) formed on the optical reflection layer 4, and a dummy (dummy) substrate 6 laminated with a predetermined thickness on the protective layer 5; formed to a predetermined thickness required in the standard.

A predetermined groove 7 is formed spirally in the substrate 2. The land 8, which is a portion other than the pregroove 7, is located on the right and left of the pregroove 7.

By irradiating the substrate 2 with the laser beam 9, the optical recording layer 3 absorbs the energy of the laser beam 9 to generate heat, and the recording pits 10 are formed by thermal decomposition of the optical recording layer 3, whereby information can be recorded in the optical recording layer 3.

The light-transmitting substrate 2 is made of a material having high transparency with a refractive index of about 1.5 to 1.7 with respect to the laser beam 9, for example, and has a thickness of about 1.1mm, and is made of a material mainly made of resin having high impact resistance, for example, polycarbonate, a glass plate, an acrylic plate, an epoxy plate, or the like.

The optical recording layer 3 is a layer formed on the substrate 2 and made of a light-absorbing substance (light-absorbing substance) containing a dye, and generates heat, melts, sublimates, deforms, or denatures when irradiated with the laser beam 9. The optical recording layer 3 is formed by uniformly applying a pigment or the like dissolved in a solvent to the surface of the substrate 2 by means of, for example, a spin-coat method.

The material for the optical recording layer 3 may be any optical recording material, but is preferably an organic dye having light absorption properties, and a material having a refractive index n exceeding 1.9 in the absorption wavelength range of the laser light 9 is required.

The light reflecting layer 4 is a metal film having high thermal conductivity and light reflectivity, and is formed of, for example, gold, silver, copper, aluminum, or an alloy containing these by means of a vapor deposition method, a sputtering method, or the like.

The protective layer 5 is made of resin having the same impact resistance and adhesion as those of the substrate 2. For example, the protective layer 5 is formed by applying an ultraviolet curable resin by a spin coating method and irradiating the resin with ultraviolet rays to cure the resin.

The dummy substrate 6 is made of the same material as the substrate 2.

In particular, as shown in fig. 5, the 1 st sub information region 12(BCA recording region), the 2 nd sub information region 13 (system lead-in region), and the main information region 14 (data region) can be defined from the center hole 11 of the optical information recording medium 1 (substrate 2) to the outer peripheral side plane and concentrically.

Having the following provisions: a 1 st sub information region 12 provided at a predetermined interval from the center of the optical information recording medium 1 on the outer peripheral portion of the center hole 11; a bar code bca (burst Cutting area) is recorded in the 1 st sub information area 12; a 2 nd sub information area 13 provided at a predetermined interval from the 1 st sub information area 12; information described by pit rows in the form of indentations (pits) is recorded in the 2 nd sub information area 13.

That is, the BCA recording is performed by forming a recording region (1 st sub information region 12) including a barcode 15 near the center of the disc (optical information recording medium 1), and recording key information and other information indicated by the barcode 15 different from the type of main information, and a serial number mark of the disc, with the laser 9 (BCA recording), thereby preventing illegal copying of the disc and the like. The sub information is not limited to the information related to the BCA recording. The side information area is not limited to the BCA recording area.

In addition, the 1 st sub information area 12 and the main information area 14 themselves have a cross section having a structure shown in fig. 6, and the barcode 15 can be recorded by the optical recording layer 3 in the 1 st sub information area 12 absorbing the laser light 9.

The 2 nd sub information region 13 is provided at a predetermined interval from the outer periphery of the 1 st sub information region 12, and recording of the 2 nd sub information (pit recording) is performed by using the pit 16 subjected to the embossing processing.

The information recorded in the 2 nd sub information area 13 includes information such as the type, structure, and manufacturer of the disc.

The main information area 14 is located on the outer side of the 2 nd sub information area 13 at a predetermined interval from the main information area, and is an area for recording and reproducing normal optical information recorded by the laser beam 9, which is used by a general user. The main information is not limited to information recorded in the main information area 14 (data area), that is, to the data information recorded by a general user.

Further, between the 1 st sub information area 12 and the 2 nd sub information area 13, a 1 st boundary area 17 having a predetermined interval is formed.

Further, a 2 nd boundary region 18 having a predetermined interval is formed between the 2 nd sub information region 13 and the main information region 14.

However, regarding these 1 st and 2 nd bounding regions 17 and 18, the standard does not specify conditions regarding a specific configuration.

In the optical information recording medium 1 configured as described above, the 1 st sub information region 12 and the 2 nd sub information region 13 are both written with information by the BCA writing device and the stamper device (both not shown) at the stage of shipment from the factory. However, there is a problem that it is necessary to perform BCA recording by means of barcode recording in the 1 st sub information area 12, independently of the imprint forming process for forming the pregroove 7 and the land 8 on the substrate 2, after the optical recording layer 3, the optical reflection layer 4, the protective layer 5, and the dummy substrate 6 are sequentially formed on the substrate 2.

In addition, in the 2 nd sub information region 13, pit information described by the pit train is recorded by the embossing process at the same time in the imprint forming step when the substrate 2 is formed. However, there is a problem how to handle the 1 st and 2 nd boundary regions 17 and 18 due to the relationship with the 1 st and main information regions 12 and 14 (described later based on fig. 8 and 9).

Such a problem also exists with other types of blu-ray discs (BDs).

Fig. 7 is a schematic cross-sectional view of the optical information recording medium 20 of the blu-ray disc (particularly BD).

As shown in the figure, the optical information recording medium 20 has: the transparent substrate 2, the light reflecting layer 4, the optical recording layer 3, the protective layer 5, the adhesive layer 21, and the cover layer 22 are substantially the same as the optical information recording medium 1 (fig. 5) in plan view. Further, an inorganic layer may be added to the surface of the protective layer 5 or the adhesive layer 21.

The adhesive layer 21 adheres a cover layer 22 having a thickness of about 0.1mm to the protective layer 5.

By irradiating the laser beam 9 from the cover layer 22 side, the optical recording layer 3 absorbs the energy of the laser beam 9 to generate heat, and the optical recording layer 3 is thermally decomposed, so that the recording pit 10 can be formed in any of the pregroove 7 and the land 8, and information can be recorded in the optical recording layer 3.

Fig. 8 is an enlarged cross-sectional view of a portion of the 1 st and 2 nd boundary regions 17 and 18, respectively, drawn with their relative sizes and shapes omitted for convenience of explanation.

As shown in the figure, it is not necessary to form the optical recording layer 3 in the 1 st and 2 nd boundary areas 17 and 18 and to apply a pigment.

In the 1 st sub information area 12, the barcode 15 may be formed by embossing without forming a pigment film as in the optical recording layer 3. However, it is not practical to prepare a stamper for each optical information recording medium 1 (optical information recording medium 20), and a dye film is actually formed in the same manner as the 2 nd sub information region 13.

However, if the dye is not applied to only the 1 st boundary region 17, the 2 nd sub information region 13, and the 2 nd boundary region 18, an extra process is required in the manufacturing process of the optical information recording medium 1 and the optical information recording medium 20, which is not preferable.

That is, in terms of the manufacturing process, it is preferable that the coloring material is applied from the 1 st sub information region 12 to the 1 st boundary region 17, the 2 nd sub information region 13, the 2 nd boundary region 18, and the main information region 14.

Fig. 9 is an enlarged cross-sectional view of the portions of the 1 st boundary region 17 and the 2 nd boundary region 18 in a state where the dye is applied, and since the portions of the 1 st boundary region 17 and the 2 nd boundary region 18 are mirror surfaces, there is a problem that in a step of dissolving the dye in an organic solvent to form a dye solution and applying the dye solution by a spin coating method, the uniformity of application of the dye solution in these portions is poor, and the 1 st pit 23 and the 2 nd pit 24 are generated in the dye in the 1 st boundary region 17 and the 2 nd boundary region 18, respectively, whereby the film forming property is lowered, and there is a possibility that a problem arises as the optical characteristics of the optical information recording medium 1 or the optical information recording medium 20.

[ patent document 1] Japanese patent application laid-open No. 2003-331465

Disclosure of Invention

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide an optical information recording medium capable of forming a dye layer (optical recording layer) to a predetermined level.

Further, an object of the present invention is to provide an optical information recording medium capable of improving the applicability of a dye solution to a substrate.

Further, an object of the present invention is to provide an optical information recording medium that can obtain optimum optical characteristics.

Further, an object of the present invention is to provide an optical information recording medium which ensures the characteristics of the 1 st sub information region (BCA recording region), the 2 nd sub information region (system lead-in region), and the main information region (data region) and has good production efficiency.

Further, an object of the present invention is to provide an optical information recording medium in which groove characteristics of the 1 st sub information region and the main information region and stamper characteristics of the 2 nd sub information region can be easily secured.

That is, the present invention focuses on forming grooves of a predetermined shape in each of the 1 st boundary region between the 1 st sub information region and the 2 nd boundary region between the 2 nd sub information region and the main information region, thereby stably securing film forming properties. A first aspect of the present invention provides an optical information recording medium including a substrate having optical transparency, an optical recording layer including a light absorbing substance composed of a dye that absorbs laser light, and a light reflecting layer that reflects the laser light, the optical recording layer having a main information region in which main information that can be read is optically recorded by irradiation with the laser light, the optical information recording medium characterized in that: the optical information recording medium includes a 1 st sub information region, a 2 nd sub information region, and the main information region arranged in this order from the center toward the outer periphery of the optical information recording medium, wherein 1 st sub information can be recorded in the 1 st sub information region by the laser beam, 2 nd sub information can be recorded in the 2 nd sub information region by the laser beam, a 1 st groove is formed in a 1 st boundary region between the 1 st sub information region and the 2 nd sub information region, and a 2 nd groove is formed in a 2 nd boundary region between the 2 nd sub information region and the main information region. This makes it possible to improve the uniformity (coatability) of the optical recording layer by using the grooves formed between the respective regions.

The 1 st sub information may be recorded by a barcode of a different type from the main information. In this embodiment, since the uniformity can be ensured regardless of the recording shape, the variation in barcode recording becomes wide, and information other than pit recording used for copy control or the like can be recorded.

The 2 nd sub information may be recorded by pit rows in an indentation pattern. In this embodiment, the effect of improving the characteristics due to uniformity can be obtained also for the shape of the indentation, and therefore, the present invention can be applied to applications such as ROM and R-Hybrid Disc (Hybrid Disc).

The 1 st groove and the 2 nd groove may have the same depth, respectively. This makes it possible to easily perform the production of the stamper and the transfer at the time of forming the substrate.

The 1 st groove and the 2 nd groove may have the same pitch. This makes it possible to easily perform the production of the stamper and the transfer at the time of forming the substrate.

The 1 st groove and the 2 nd groove may have different pitches, respectively. This makes it possible to make the reading method more complicated, to apply the method to the use of copy prevention and the like, and to prevent an erroneous operation and the like when a player or recorder of a different standard is inserted.

The 1 st groove and the 2 nd groove may have the same width, respectively. This makes it possible to easily perform the production of the stamper and the transfer at the time of forming the substrate.

The 1 st groove and the 2 nd groove may have different widths, respectively. This makes it possible to make the reading method more complicated, to apply the method to the use of copy prevention and the like, and to prevent an erroneous operation and the like when a player or recorder of a different standard is inserted.

The 1 st groove and the 2 nd groove may be formed in a spiral shape or a concentric circle shape. Ease of manufacture of the stamp when used in a spiral; when the concentric circles are formed, the reading method can be made complicated, and the concentric circles can be applied to applications such as copy prevention.

The depth of the 1 st groove may be the same as the depth of the pregroove of the 1 st sub information area or the depth of the pit of the 2 nd sub information area. This makes it possible to easily perform the production of the stamper and the transfer at the time of forming the substrate.

The width of the 1 st groove may be the same as the width of a pregroove of the 1 st sub information area or the width of a pit of the 2 nd sub information area. This makes it possible to easily perform the production of the stamper and the transfer at the time of forming the substrate.

The depth of the 2 nd groove may be the same as the depth of a pit in the 2 nd sub information region or the depth of a pregroove in the main information region. This makes it possible to easily perform the production of the stamper and the transfer at the time of forming the substrate.

The width of the 2 nd groove may be the same as the width of a pit of the 2 nd sub information region or the width of a pregroove of the main information region.

A second aspect of the present invention provides an optical information recording medium including a substrate having optical transparency, an optical recording layer including a light absorbing substance composed of a dye that absorbs laser light, and a light reflecting layer that reflects the laser light, the optical recording layer having a main information region in which main information that can be read is optically recorded by irradiation with the laser light, the optical information recording medium characterized in that: the information recording medium has information areas divided into a plurality of areas, the information areas are formed at predetermined intervals, and grooves are formed at the intervals. Therefore, the optical information recording medium of the present invention can be effectively used for preventing copying, for example, by using various auxiliary information which is required and added in accordance with the technology of the day-to-day difference in the divided sub information regions.

The depth, width, and pitch of the present invention can be appropriately adjusted according to the type of laser light and optical information recording medium used. As a depth standard, the wavelength λ of the control laser is usually λ/3 to λ/8. The pitch is 1.55 to 1.65, preferably 1.58 to 1.62, relative to 750nm to 800nm (CD recording); 0.60 to 0.80, preferably 0.72 to 0.76, relative to 600 to 700nm (660 nm for DVD recording); 0.30 to 0.50 nm with respect to 350 to 410nm (405 nm of blue laser). The width can be adjusted to 30% to 70%, preferably 40% to 60%, relative to the distance. When the amount is outside these ranges, the effects of the present invention may not be sufficiently exhibited.

In the optical information recording medium of the present invention, there are information areas divided into a plurality of, the information areas are configured with a predetermined interval therebetween, and grooves are formed at the interval. Specifically, grooves having a predetermined shape are formed in a 1 st boundary region between the 1 st sub information region and the 2 nd sub information region, and a 2 nd boundary region between the 2 nd sub information region and the main information region, respectively. Therefore, when the optical recording layer is formed by applying the coloring matter to these areas, the characteristics of the coloring matter in the 1 st and 2 nd boundary areas are made the same as those in the 1 st, 2 nd and main information areas, so that a uniform and stable coloring matter film can be formed, stable characteristics of each area can be secured, and the production efficiency can be improved.

Drawings

Fig. 1 is an enlarged cross-sectional view of a main portion of an optical information recording medium 30 according to embodiment 1 of the present invention.

Fig. 2 is an enlarged cross-sectional view of a main part of an optical information recording medium 40 according to embodiment 2 of the present invention.

Fig. 3 is an enlarged cross-sectional view of a main portion of an optical information recording medium 50 according to embodiment 3 of the present invention.

Fig. 4 is an enlarged cross-sectional view of a main portion of an optical information recording medium 60 according to embodiment 4 of the present invention.

FIG. 5 is a schematic plan view of an optical information recording medium 1 of a Blu-ray disc (HD-DVD).

FIG. 6 is a schematic cross-sectional view of an optical information recording medium 1 for a Blu-ray disc (HD-DVD).

Fig. 7 is a schematic cross-sectional view of an optical information recording medium 20 for a blu-ray disc (BD).

Fig. 8 is an enlarged cross-sectional view of the 1 st and 2 nd boundary regions 17 and 18 of the optical information recording medium 20 of the blu-ray disc (BD).

Fig. 9 is an enlarged cross-sectional view of the portions of the 1 st boundary region 17 and the 2 nd boundary region 18 in the state where the dye is applied to the optical information recording medium 20 of the blu-ray disc (BD).

Detailed Description

The present invention provides an optical information recording medium having excellent optical characteristics and production efficiency by forming grooves at predetermined intervals in a plurality of information areas.

< example >

Next, an optical information recording medium 30 according to embodiment 1 of the present invention will be described with reference to fig. 1. The same portions as those in fig. 5 to 9 are assigned the same reference numerals, and detailed description thereof is omitted.

Fig. 1 is an enlarged cross-sectional view of a main part of an optical information recording medium 30, in which a substrate 2 of the optical information recording medium 30 is provided with a pregroove 7 and a land 8 in a 1 st sub information region 12, a pit 16 in a 2 nd sub information region 13, a pregroove 7 and a land 8 in a main information region 14, a 1 st groove 31 in a 1 st boundary region 17, and a 2 nd groove 32 in a 2 nd boundary region 18.

A1 st land 33 corresponding to the land 8 is formed between the 1 st grooves 31, and a 2 nd land 34 corresponding to the land 8 is formed between the 2 nd grooves 32.

Further, the pits 16 in the 2 nd sub information area 13 are drawn relatively larger than the pre-grooves 7 in the 1 st sub information area 12 and the main information area 14.

The 1 st groove 31 and the 2 nd groove 32 have the same depth, pitch, and width, respectively, which are the same depth, pitch, and width as the pregroove 7 in the 1 st sub information area 12 and the main information area 14.

The 1 st and 2 nd grooves 31, 32 may be formed in either a spiral shape or a concentric shape.

In the optical information recording medium 30 having such a configuration, the 1 st and 2 nd boundary regions 17 and 18 are the same as the surface structures and shapes of the 1 st and main information regions 12 and 14, and the application state of the dye solution for the spin coating process for forming the optical recording layer 3 is uniform, so that the generation of the 1 st or 2 nd pits 23 and 24 (fig. 9) can be prevented, regardless of the type of the optical information recording medium 1 (fig. 6) in which the optical recording layer 3 is directly formed on the substrate 2 or the type of the optical information recording medium 20 (fig. 7) in which the optical recording layer 3 is formed on the substrate 2 via the light reflection layer 4.

The pitch or width of the 1 st and 2 nd grooves 31, 32 is not necessarily the same, and may be different to any degree as required.

Further, the optical characteristics of the 1 st sub information area 12, the 2 nd sub information area 13, and the main information area 14 are adjusted in depth, pitch, width, and shape according to the amount, type, and the like of the dye of the optical recording layer 3.

The 1 st groove 31 and the 2 nd groove 32 can be adjusted in depth, pitch, width, and shape according to the relative positional relationship of the 1 st sub information region 12, the 2 nd sub information region 13, and the main information region 14.

Fig. 2 is an enlarged cross-sectional view of a main part of an optical information recording medium 40 according to embodiment 2 of the present invention, in which a substrate 2 of the optical information recording medium 40 is formed with a pregroove 7 and a land 8 in a 1 st sub information region 12, a pit 16 in a 2 nd sub information region 13, a pregroove 7 and a land 8 in a main information region 14, a 1 st groove 31 and a 1 st land portion 33 in a 1 st boundary region 17, and a 2 nd groove 41 in a 2 nd boundary region 18.

The 2 nd land portion 42 is formed between the 2 nd trenches 41.

The 2 nd groove 41 has the same depth, pitch and width as the pits 16 of the 2 nd sub information area 13; the 2 nd groove 41 may be coated with a dye solution having the same coating property as the dye solution in the 2 nd sub information area 13.

In the optical information recording medium 40 having such a configuration, the 1 st boundary region 17 has the same surface structure and shape as the 1 st sub information region 12 and the main information region 14, and the 2 nd boundary region 18 has the same surface structure and shape as the 2 nd sub information region 13, so that the coating state of the pigment solution subjected to the spin coating process for forming the optical recording layer 3 is made as uniform as possible, thereby preventing the generation of the 1 st pit 23 or the 2 nd pit 24.

Fig. 3 is an enlarged cross-sectional view of a main part of an optical information recording medium 50 according to embodiment 3 of the present invention, in which a substrate 2 of the optical information recording medium 50 is formed with a pregroove 7 and a land 8 in a 1 st sub information region 12, a pit 16 in a 2 nd sub information region 13, a pregroove 7 and a land 8 in a main information region 14, a 1 st groove 31 and a 1 st land portion 32 similar to those described above in a 2 nd boundary region 18, and a 2 nd groove 51 and a 2 nd land portion 52 in a 1 st boundary region 17.

The 2 nd groove 51 has the same depth, pitch and width as the pits 16 in the 2 nd sub information area 13, and the pigment solution applied to the 2 nd groove 51 has the same applicability as the pigment solution in the 2 nd sub information area 13.

In the optical information recording medium 50 configured as described above, the 1 st boundary region 17 has the same surface structure and shape as the 2 nd sub information region 13, and the 2 nd boundary region 18 has the same surface structure and shape as the 1 st sub information region 12 and the main information region 14, so that the application state of the pigment solution subjected to the spin coating process for forming the optical recording layer 3 is made as uniform as possible, and the generation of the 1 st pit 23 or the 2 nd pit 24 can be prevented.

Fig. 4 is an enlarged cross-sectional view of a main part of an optical information recording medium 60 according to embodiment 4 of the present invention, in which a substrate 2 of the optical information recording medium 60 is formed with a pregroove 7 and a land 8 in a 1 st sub information region 12, a pit 16 in a 2 nd sub information region 13, a pregroove 7 and a land 8 in a main information region 14, a 2 nd groove 51 and a 2 nd land 52 in a 1 st boundary region 17, and a 2 nd groove 41 and a 2 nd land 42 in a 2 nd boundary region 18.

In the optical information recording medium 60 having such a configuration, the 1 st boundary region 17 and the 2 nd boundary region 18 have the same surface structure and shape as the 2 nd sub information region 13, and the application state of the pigment solution subjected to the spin coating process for forming the optical recording layer 3 is made as uniform as possible, thereby preventing the generation of the 1 st pit 23 or the 2 nd pit 24.

Claims (14)

1. An optical information recording medium comprising a substrate having optical transparency, an optical recording layer containing a light absorbing substance composed of a dye that absorbs laser light, and a light reflecting layer that reflects the laser light, the optical recording layer having a main information region in which main information that can be read is optically recorded by irradiation with the laser light, the optical information recording medium characterized in that:

the optical information recording medium is provided with a 1 st sub information region, a 2 nd sub information region, and the main information region in this order from the center toward the outer periphery,

the 1 st sub information can be recorded in the 1 st sub information area by the laser beam,

the 2 nd sub information can be recorded in the 2 nd sub information area by the laser light,

a 1 st groove is formed in a 1 st boundary region between the 1 st sub information region and the 2 nd sub information region,

and forming a 2 nd groove in a 2 nd boundary region between the 2 nd sub information region and the main information region.

2. The optical information recording medium according to claim 1, wherein:

the 1 st sub information is recorded by a barcode of a different type from the main information.

3. The optical information recording medium according to claim 1, wherein:

the 2 nd sub information is recorded by pit rows in an indentation pattern.

4. The optical information recording medium according to claim 1, wherein:

the 1 st groove and the 2 nd groove have the same depth.

5. The optical information recording medium according to claim 1, wherein:

the 1 st groove and the 2 nd groove have the same pitch.

6. The optical information recording medium according to claim 1, wherein:

the 1 st groove and the 2 nd groove have different pitches.

7. The optical information recording medium according to claim 1, wherein:

the 1 st groove and the 2 nd groove have the same width.

8. The optical information recording medium according to claim 1, wherein:

the 1 st groove and the 2 nd groove have different widths.

9. The optical information recording medium according to claim 1, wherein:

the 1 st groove and the 2 nd groove are spiral or concentric.

10. The optical information recording medium according to claim 1, wherein:

the depth of the 1 st groove is the same as the depth of the pregroove of the 1 st sub information area or the depth of the pit of the 2 nd sub information area.

11. The optical information recording medium according to claim 1, wherein:

the width of the 1 st groove is the same as the width of a pregroove of the 1 st sub information area or the width of a pit of the 2 nd sub information area.

12. The optical information recording medium according to claim 1, wherein:

the depth of the 2 nd groove is the same as the depth of a pit in the 2 nd sub information region or the depth of a pregroove in the main information region.

13. The optical information recording medium according to claim 1, wherein:

the width of the 2 nd groove is the same as the width of a pit in the 2 nd sub information region or the width of a pregroove in the main information region.

14. An optical information recording medium comprising a substrate having optical transparency, an optical recording layer containing a light absorbing substance composed of a dye that absorbs laser light, and a light reflecting layer that reflects the laser light, the optical recording layer having a main information region in which main information that can be read is optically recorded by irradiation with the laser light, the optical information recording medium characterized in that:

the information recording medium has information areas divided into a plurality of areas, the information areas are formed at predetermined intervals, and grooves are formed at the intervals.