WO2006038597A1

WO2006038597A1 - Optical disc

Info

Publication number: WO2006038597A1
Application number: PCT/JP2005/018312
Authority: WO
Inventors: Hiroshi Kubo
Original assignee: Fujifilm Corporation
Priority date: 2004-10-05
Filing date: 2005-10-04
Publication date: 2006-04-13
Also published as: JP2006107619A; TW200617948A

Abstract

An optical disc wherein a visible image having a high contrast can be efficiently recorded by using laser beams, an image recording plane can be easily discriminated and to which a discrimination characteristic is given. On a board of the optical disc, an image recording layer for forming an image by the laser beams is formed. On the image recording layer, a transparent layer and a transparent protection layer or a protection board are provided, and one or more printing areas are provided on at least one part of the board, transparent layer, transparent protection layer or the protection board on the image recording layer side.

Description

Specification

Optical disc

Technical field

TECHNICAL FIELD [0001] The present invention relates to an optical disc, and more particularly to an optical disc having an image recording layer for forming an image with a laser beam.

Background art

[0002] Optical discs have visual information such as the title of music data recorded on the recording surface and the title for identifying the recorded data on the surface opposite to the recording surface on which music data is recorded. A label with a printed label is known. Such an optical disk is manufactured by printing a title or the like on a circular label sheet in advance by a printer or the like and sticking the label sheet on a surface opposite to the recording surface of the optical disk.

However, as described above, when an optical disk in which a desired visible image such as a title is recorded on the label surface is produced, a printer is required separately from the optical disk drive. Therefore, after recording on a recording surface of an optical disk using an optical disk drive, the optical disk is taken out from the optical disk drive, and a label sheet printed by a separately prepared printer as described above is attached. It is necessary to perform complicated work.

[0004] Therefore, there has been proposed an optical disc that can be displayed by changing the contrast between the surface and the background using a laser marker on the surface opposite to the recording surface (for example, Patent Documents 1 to 4). 4). By using such a method, a desired image can be recorded on the label surface of the optical disk by an optical disk drive without separately preparing a printer or the like. However, with this method, a high-capacity gas laser such as a carbon dioxide laser with low sensitivity must be used, and the visible image formed by the laser light as described above has low contrast and visibility. It was inferior. In addition, it may be difficult to distinguish the surface on which an image is formed from the surface on which information is recorded.

Patent Document 1: Japanese Patent Laid-Open No. 11 66617

Patent Document 2: JP 2000-113516 A

Patent Document 3: JP 2001-283464 A Patent Document 4: Japanese Unexamined Patent Publication No. 2000-173096

Disclosure of the invention

Problems to be solved by the invention

[0005] The present invention has been made in view of the above conventional problems, and it is an object of the present invention to achieve the following objects. That is, an object of the present invention is to provide an optical disc that can efficiently record a high-contrast visible image by using a laser beam, can easily discriminate the image recording surface, and can provide discrimination. It is in.

Means for solving the problem

[0006] The above problems can be solved by the present invention described below.

A first aspect of the present invention is an optical disc in which an image recording layer for forming an image with a laser beam is formed on a substrate,

A transparent layer, a transparent protective layer or a protective substrate is provided on the image recording layer, and at least one printing area is provided on at least a part of the substrate, transparent layer, transparent protective layer or protective substrate on the image recording layer side. It is an optical disc characterized by being made.

A second aspect of the present invention is an optical disc in which an image recording layer for forming an image by a laser beam and an information recording layer are formed on a substrate,

According to a third aspect of the present invention, the light according to the first or second aspect is characterized in that the printing region has an annular or non-annular shape and is provided continuously or intermittently. It is a disk.

According to a fourth aspect of the present invention, the outermost peripheral edge of the print area is outside the outer peripheral edge of the image recording layer, and the inner peripheral edge of the print area is outside the inner peripheral edge of the image recording layer. 4. The optical disc according to the third aspect, wherein the optical disc is inside the outer peripheral edge of the image recording layer.

The fifth aspect of the present invention has a reflective layer on the image recording layer or information recording layer, and the outer peripheral edge of the reflective layer is outside the outer peripheral edge of each image recording layer or information recording layer, The outermost peripheral edge of the printing region is outside the outer peripheral edge of the reflective layer, and the inner peripheral edge of the reflective layer is inside the inner peripheral edge of each of the image recording layer or the information recording layer. The optical disc according to the fourth aspect.

According to a sixth aspect of the present invention, the innermost peripheral edge of the print area is on the inner side of the inner peripheral edge of the image recording layer, and the outer peripheral edge of the print area is on the outer side of the inner peripheral edge of the image recording layer. The optical disk according to the third aspect, wherein the optical disk is located inside the outer peripheral edge of the image recording layer.

According to a seventh aspect of the present invention, a reflective layer is provided on the image recording layer or the information recording layer, and an inner peripheral end of the reflective layer is located inside an inner peripheral end of each of the image recording layer or the information recording layer. The innermost peripheral edge of the print region is inside the inner peripheral edge of the reflective layer, and the outer peripheral edge of the reflective layer is outside the outer peripheral edge of each of the image recording layer or the information recording layer. The optical disc according to the sixth aspect, which is characterized by the above.

An eighth aspect of the present invention is the optical disc according to the second aspect, wherein an intermediate layer is provided between the image recording layer and the information recording layer.

A ninth aspect of the present invention is the optical disc according to the eighth aspect, wherein the intermediate layer is formed as an adhesive layer.

A tenth aspect of the present invention is the optical disk according to the second aspect, wherein a transparent dielectric layer is provided on the image recording layer or the information recording layer.

An eleventh aspect of the present invention is the optical disk according to the second aspect, wherein the transparent layer is provided as a cover layer on the information recording layer side.

A twelfth aspect of the present invention is the optical disk according to the eleventh aspect, wherein a hard coat layer is further provided on the cover layer.

According to a thirteenth aspect of the present invention, in the first or second aspect, the printing region is selected from a group strength of a material that also has an acrylic ester ultraviolet curable ink and a urethane ultraviolet curable ink force. It is an optical disk as described in an aspect.

A fourteenth aspect of the present invention is the optical disk according to the first or second aspect, characterized in that the thickness force of the printing region is 3 to 50 / ζ πι.

In a fifteenth aspect of the present invention, the radial length of the print area is set to the radius of the optical disk. The optical disk according to the first or second aspect, wherein the optical disk is 1Z10 to 1Z2.

A sixteenth aspect of the present invention is described in the third aspect, wherein the non-annular shape of the print region is a shape selected from an elliptical shape, a sector shape, a rhombus shape, and a quadrangular polygonal force. This is an optical disc.

The invention's effect

[0007] According to the present invention, there is provided an optical disk capable of efficiently recording a visible image with high contrast by using a laser beam, easily discriminating an image recording surface, and imparting discriminability. You can do it.

Brief Description of Drawings

FIG. 1 is a top view as an example of an optical disc of the present invention.

FIG. 2 is a partial cross-sectional view of the layer configuration taken along line AA in FIG.

FIG. 3 is a top view as another example of the optical disc of the present invention.

4 is a partial cross-sectional view showing another example of the layer configuration with respect to line AA in FIG. 1.

FIG. 5 is a partial cross-sectional view showing another example of the layer structure taken along line AA in FIG. 1.

BEST MODE FOR CARRYING OUT THE INVENTION

[0009] [Optical Disc]

In the optical disk of the present invention, an image recording layer for forming an image with a laser beam is formed on a substrate. The image recording layer is a layer provided for the user to form a desired image. Further, a transparent layer, a transparent protective layer or a protective substrate is provided on the image recording layer, and a printing area is provided on at least a part of the substrate, the transparent protective layer or the protective substrate. The printing area is an area for the manufacturer to print information such as disk information in advance. By providing such a print area, it becomes easy to determine the force of which surface the image recording surface is. In addition, since the manufacturer of the optical disc is printed, it becomes possible to differentiate from other optical discs, and to provide discrimination. Furthermore, it is possible to perform machine-identifiable printing such as barcodes. Hereinafter, the optical disk of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a top view as an example of the optical disc of the present invention. In Figure 1, the optical disk 100 is provided with printing regions 10 and 20 on the outer peripheral side and the inner peripheral side thereof. In FIG. 1, the respective printing regions 10 and 20 are illustrated in an annular shape for convenience. However, the present invention is not limited to such an annular shape, and may be various non-annular shapes such as a polygonal shape. it can. Further, these print areas may be formed continuously or intermittently. Furthermore, only one of the print areas 10 and 20 may be formed. By providing the print area in this way, the effect of the print area can be effectively exhibited while ensuring a sufficient image recording area for the user.

FIG. 2 shows a partial cross-sectional view of the layer structure as an example of the optical disc of the present invention along the line AA in FIG. As shown in FIG. 2, when the print area 10 is provided on the outer peripheral side, the outermost peripheral edge is outside the outer peripheral edge of the image recording layer 80, and the inner peripheral edge of the print area 10 is the inner peripheral edge of the image recording layer 80. It is preferable to be outside the edge and inside the outer peripheral edge of the image recording layer 80.

In addition, as shown in FIG. 2, when the printing region 20 is provided on the inner peripheral side, the innermost peripheral edge is inside the inner peripheral edge of the image recording layer 80, and the outer peripheral edge of the printing region 20 is the image. It is preferable to be outside the inner peripheral edge of the recording layer 80 and inside the outer peripheral edge of the image recording layer 80.

In FIG. 2, when the optical disc of the present invention has the reflective layer 60 in the image recording layer 80 and the information recording layer 50, the printing region 10 has its outermost peripheral edge outside the outer peripheral edge of the reflective layer 60. It is preferable. In this way, by covering the edge of the reflective layer with the printing area, it is possible to prevent the edge from being seen through the substrate, transparent layer or protective substrate, and to prevent the appearance of the optical disk from being impaired. it can. For the same reason, it is preferable that the outermost peripheral edge of the printing region 10 is outside the outer peripheral edge of the information recording layer 50.

Further, in FIG. 2, when the optical disc of the present invention has the reflective layer 60 in the image recording layer 80 and the information recording layer 50, the innermost peripheral edge of the printing region 20 is the inner peripheral edge of the reflective layer 60. It is preferable to be inside. For the same reason, it is preferable that the outer peripheral edge of the print region 20 is outside the outer peripheral edge of the information recording layer 50. Note that the printing layer covering the end portions of the reflective layer and the information recording layer is not limited to the configuration shown in FIG.

[0015] In any of the above print areas, from the viewpoint of sufficiently securing the image recording area of the image recording layer 80, it is preferable that the length in the radial direction is 1Z10 to 1Z2 of the radius of the optical disk. Z5˜: More preferably, LZ3.

[0016] Since the printing region is subjected to a printing process by screen printing or offset printing, specifically, the region includes, for example, an acrylic ester ultraviolet curable ink or a urethane ultraviolet curable ink. It is preferable to use a material. The printing region can be formed by dissolving the material in a known solvent to prepare a coating solution, and then applying the coating solution and drying or curing. It can also be formed by laminating a film made of the above material. The thickness of the printing layer as the printing region is preferably 3 to 50 μm, more preferably 5 to 30 m! / ヽ.

[0017] The optical disc of the present invention is not limited to the embodiment described in FIG. 1 and FIG. In other words, as shown in FIG. 3, at least one printing area may be provided in a certain shape that is annular or non-annular. As shown in Fig. 3, various non-annular shapes such as an ellipse (reference 30a), a fan (reference 30b), a polygon such as a rhombus (reference 30c) and a quadrangle (reference 30d) are used. A plurality of these may be combined. In such a case, the maximum radial length of any shape is preferably 1Z10 to 1Z2 that is the radius of the optical disc, more preferably 1Z5 to 1Z3. By setting the optical disk radius to 1 Z10 to 1Z2, a sufficient image recording area can be secured while performing the function as a printing area.

[0018] The type of the optical disk of the present invention may be any of a read-only type, a write-once type, a rewritable type, etc., but is preferably a write-once type. The recording format is not particularly limited, such as phase change type, magneto-optical type, and dye type, but is preferably a dye type.

As the configuration of the optical disk of the present invention, first, there is a DVD type configuration (including DVD-R, DVD-RW, HD DVD, etc. in addition to DVD). In other words, it is a laminated type, in which an information recording layer, an image recording layer, and a protective substrate are formed in this order on a substrate.

[0020] As another configuration of the optical disc of the present invention, a CD-type configuration (including CD-RCD-RW and the like in addition to CD) may be used. The configuration is a configuration in which an information recording section or an information recording layer, an image recording layer, and a transparent layer are formed in this order on a substrate. Furthermore, the optical disc of the present invention may be configured as a Blu-ray disc (BD). it can.

For example, in the optical disc shown in FIG. 2, a laminated body in which the information recording layer 50 and the reflective layer 60 are formed in this order on the substrate 40, and the image recording layer 80 and the reflective layer 60 on the protective substrate 70. The laminated body formed in this order is bonded via an adhesive layer 90A so that the reflective layers are inner layers. That is, it has a laminated DVD-R layer structure. Print regions 10 and 20 are formed on the surface of the protective substrate 70 where the reflective layer or the like is not formed. Here, the layer configuration shown in FIG. 2 is merely an example, and a protective layer, a transparent layer, and the like are appropriately provided depending on the type of the medium.

[0022] For example, when the optical disc of the present invention is a Blu-ray disc, the layer configuration as shown in FIG. That is, the reflective layer 60, the image recording layer 80, the transparent dielectric layer 92, and the transparent protective layer 94 are formed in this order on one surface side of the substrate 40. On the other surface side of the substrate 40, a reflective layer 60, an information recording layer 50, and a transparent dielectric layer 92 are formed in this order, and a transparent sheet and a hard coat as the transparent layer 96 are further formed through an adhesive layer 90A. Layer 98 is formed in this order. On the transparent protective layer 94, printing regions 10 and 20 are formed.

[0023] When the optical disc of the present invention is a CD-R, the layer configuration as shown in Fig. 5 is shown by assigning the same reference numerals to those corresponding to Fig. 2. That is, the information recording layer 50 and the reflective layer 60 are formed in this order on the substrate 40, and the reflective layer 60, the image recording layer 80, the transparent dielectric layer 92, and the transparent protective layer 94 are formed via the intermediate layer 90. It is formed in order. Print regions 10 and 20 are formed on the transparent protective layer 94.

Hereinafter, each layer and substrate other than the printing layer will be described.

[0024] (Information recording layer)

The information recording layer is a layer in which code information (encoded information) such as digital information is recorded. Examples of the information recording layer include a dye type, a write-once type, a phase change type, and a magneto-optical type. A mold is preferred.

[0025] Specific examples of the dye contained in the dye-type recording layer include cyanine dyes, oxonol dyes, metal complex dyes, azo dyes, and phthalocyanine dyes.

Also, JP-A-4-74690, JP-A-8-127174, JP11-53758 11-334204, 11-334205, 11-334206, 11-334207, JP 2000-43423, 2000-108513, and 2000- The dyes described in Japanese Patent No. 158818 are preferably used.

[0026] Further, the recording material is not limited to a dye, but is a triazole compound, a triazine compound, a cyanine compound, a merocyanine compound, an aminobutadiene compound, a phthalocyanine compound, a cinnamic acid compound, a piorogen compound, an azo compound, Organic compounds such as oxonol benzoxazole compounds and benzotriazole compounds are also preferably used. Of these compounds, cyanine compounds, aminobutadiene compounds, benzotriazole compounds, and phthalocyanine compounds are particularly preferable.

[0027] The information recording layer is prepared by dissolving a recording material such as a dye in a suitable solvent together with a binder or the like to prepare a coating solution, and then coating the coating solution on a substrate to form a coating film. It is formed by drying. The concentration of the recording substance in the coating solution is generally in the range of 0.01 to 15% by mass, preferably in the range of 0.1 to 10% by mass, more preferably in the range of 0.5 to 5% by mass, and most preferably Preferably it is the range of 0.5-3 mass%.

[0028] The information recording layer can be formed by a method such as vapor deposition, sputtering, CVD, or solvent coating. Solvent coating is preferred. In this case, in addition to the above-mentioned pigments and the like, further, if necessary, a quencher, a binder, etc. are dissolved in a solvent to prepare a coating solution, and then this coating solution is applied to the substrate surface to form a coating film and then dried. Can be done.

[0029] Solvents for the coating solution include esters such as butyl acetate, lactic acid ethyl, and cellosolve acetate; ketones such as methyl ethyl ketone, cyclohexanone, and methyl isobutyl ketone; dichloromethane, 1,2-dichloroethane, Chlorinated hydrocarbons such as chloroform; Amides such as dimethylformamide; Hydrocarbons such as methylcyclohexane; Ethers such as dibutyl ether, diethyl ether, tetrahydrofuran, and dioxane; Ethanol, n-propanol, isopropanol, n-butanol, Alcohols such as diacetone alcohol; Fluorinated solvents such as 2, 2, 3, 3-tetrafluoropropanol; ethylene glycol monomethylenoatenole, ethyleneglycolenomethenoleenotenole, propyleneglycolonemonomethylate And the like da recall ethers such as Le.

The above solvents may be used alone or in combination of two or more in consideration of the solubility of the dye used. Can be used together. Various additives such as anti-oxidation agents, UV absorbers, plasticizers and lubricants may be added to the coating solution depending on the purpose.

[0030] When a binder is used, examples of the binder include natural organic polymer substances such as gelatin, cellulose derivatives, dextran, rosin and rubber; and carbonized substances such as polyethylene, polypropylene, polystyrene and polyisobutylene. Hydrogen-based resin: Poly-salt-bule, poly-salt-vinylidene, poly-salt-bule-polyacetate copolymer, etc .; Acrylics such as polymethyl methacrylate, polymethyl methacrylate Examples include synthetic organic polymers such as polybulal alcohol, chlorinated polyethylene, epoxy resin, butyral resin, rubber derivatives, and initial condensates of thermosetting resins such as phenol formaldehyde resin. it can.

[0031] When a binder is used in combination as a material for the information recording layer, the amount of binder used is generally in the range of 0.01 to 50 times the mass of the dye, preferably 0.1 to It is in the range of 5 times the amount.

[0032] Examples of the solvent application method include a spray method, a spin coating method, a dip method, a roll coating method, a blade coating method, a doctor roll method, and a screen printing method. The information recording layer may be a single layer or a multilayer. The thickness of the information recording layer is generally in the range of 10 to 5 OOnm, preferably in the range of 15 to 300 nm, more preferably in the range of 20 to 150 nm.

[0033] The information recording layer may contain various anti-fading agents in order to improve the light resistance of the information recording layer. As the anti-fading agent, singlet oxygen quencher is generally used. As the singlet oxygen quencher, those already described in publications such as known patent specifications can be used. Specific examples thereof include JP-A-58-175693, 59-31194, 60-18387, 60-19586, 60-19587, 60-35054, 60-36190. 60-36191, 60-44554, 60-44555, 60-44389, 60-44390, 60-54892, 60-47069, 68-209995, JP-A-4-25492, JP-B-1-38680, JP-A-6-26028, etc., German Patent No. 350399, and the Journal of Japan Society for Social Sciences, October 1992, page 1141, etc. Things can be mentioned. [0034] The amount of the anti-fading agent such as the singlet oxygen quencher used is usually in the range of 0.1 to 50% by mass, preferably in the range of 0.5 to 45% by mass of the pigment. More preferably, it is in the range of 3 to 40% by mass, particularly preferably in the range of 5 to 25% by mass.

[0035] Specific examples of the material constituting the phase change type information recording layer include Sb—Te alloy, Ge—S b—Te alloy, Pd—Ge—Sb—Te alloy, Nb—Ge—Sb—Te alloy. , Pd—Nb—Ge—S b—Te alloy, Pt—Ge—Sb—Te alloy, Co—Ge—Sb—Te alloy, In—Sb—Te alloy ゝ Ag—In—Sb—Te alloy, Ag—V — In—Sb—Te alloy, Ag—Ge—In—Sb—Te alloy, and the like. Among these, Ge-Sb-Te alloy and Ag-In-Sb-Te alloy are preferable because they can be rewritten many times.

The thickness of the phase change information recording layer is preferably 10 to 50 nm, more preferably 15 to 30 nm.

[0036] The above-described phase change type information recording layer can be formed by a vapor phase thin film deposition method such as a sputtering method or a vacuum evaporation method.

[0037] (Image recording layer)

As described above, the optical disc of the present invention has an image recording layer on the protective substrate or the transparent protective layer side. In the image recording layer, visible images (visible information) desired by the user, such as characters, graphics, and pictures, are recorded. Examples of visible images include disc titles, content information, content thumbnails, related patterns, design patterns, copyright information, recording date, recording method, recording format, barcodes, and the like.

[0038] The image recording layer only needs to be able to record image information such as characters, images, and patterns by laser light irradiation so that it can be visually recognized. The coloring power described in the information recording layer described above is appropriately selected. can do.

[0039] In the optical disc of the present invention, the information recording layer component (dye or phase change recording material) described above and the image recording layer component may be the same or different. Since the required characteristics are different between the recording layer and the image recording layer, it is preferable to make the constituent components different. Specifically, the constituent components of the information recording layer are preferably excellent in recording / reproducing characteristics, and the constituent components of the image recording layer are preferably those in which the contrast of the recorded image is high. In particular, when a dye is used, the image recording layer has a contrast of the recorded image. From the viewpoint of improving the color, it is preferable to use cyanine dyes, phthalocyanine dyes, azo dyes, azo metal complexes, oxonol dyes, and leuco dyes among the dyes described above.

[0040] A leuco dye can also be used. Specifically, crystal bioletatatatone; 3, 3 bis (1-ethyl-2-methylindole-3-yl) phthalide, 3- (4-jetylamino-2 ethoxyphenyl) —3— (1-ethyl-2-methylindole) — 3—yl) — Phthalide compounds such as 4-azazaphthalide; 3-cyclohexylmethylamino 6-methyl-7 amino-linofluorane, 2— (2 chloroanilino) 6 dibutylaminofluorane, 3— Jetylamino-6-methyl-7-anilinofluorane, 3-jetylamino-6—methyl-7 xylidinofluorane, 2 -— (2 chloroanilino) 6 jetylaminofluorane, 2-alkylino 3-methyl-6 (N-ethyliso) Pentylamino) fluorane, 3 jetylamino 6-chloro-7-anilinofluorane, 3-benzylethylamino 6 methyl-7-anilinofluorane, 3 Fluoran compounds such as methylpropylamino 6-methyl 7-Aniri Nofuruoran; etc. preferable.

[0041] Further, one of the information recording layer and the image recording layer may be a phase change type and the other may be a dye type. In this case, the information recording layer is preferably a phase change type and the image recording layer is preferably a dye type.

[0042] The image recording layer can be formed by preparing a coating solution by dissolving the above-described dye in a solvent and coating the coating solution. As the solvent, the same solvent as that used for preparing the coating solution for the information recording layer can be used. Other additives and coating methods can be performed in the same manner as the recording layer described above.

[0043] The thickness of the image recording layer is preferably 0.01 to 200 μm, more preferably 0.05 to 20 μm, and 0.1 to 5 m. Is more preferable.

[0044] (Substrate)

The substrate of the optical disk of the present invention (the substrate on the information recording layer side, which corresponds to reference numeral 40 in the example of FIG. 2) can be arbitrarily selected from various materials used as a substrate of a conventional optical disk. I'll do it.

Examples of the substrate material include acrylic resin such as glass, polycarbonate, and polymethyl methacrylate, polychlorinated bulle, salted and bullyed resin such as salted and bully copolymer, and epoxy resin. Examples of the resin include amorphous resin, amorphous polyolefin, and polyester, which may be used in combination as desired.

These materials can be used as a film or as a rigid substrate. Among the above materials, point polycarbonate such as moisture resistance, dimensional stability and price is preferable.

[0045] The thickness of the substrate is preferably 0.05-1 to 2 mm, more preferably 0.1 to 1.1 mm.

The substrate is provided with irregularities (pregroups) representing information such as tracking guide grooves or address signals.

In the case of DVD-R or DVD-RW, the pre-group track pitch is preferably in the range of 300 to 90 Onm, more preferably in the range of 350 to 850 nm, and more preferably in the range of 400 to 80 Onm. preferable.

[0047] The depth of the pregroup (groove depth) is preferably in the range of 100 to 160 nm, more preferably 120 to 150 nm, and even more preferably 130 to 140 nm! /. Furthermore, the groove width (half-value width) of the pre-group is preferably 200 to 400 nm, more preferably 230 to 380 nm, and more preferably 250 to 350 nm.

On the other hand, in order to achieve a higher recording density, a substrate on which a group having a narrower track pitch than that of a conventional DVD-R or the like may be used. In this case, the groove pitch of the groove is preferably in the range of 280 to 450 111, more preferably in the range of 300 to 420 nm, and even more preferably 320 to 400 nm. The group depth (groove depth) is preferably in the range of 15 to 150 nm, more preferably in the range of 25 to 100 nm. Further, the groove width of the group should be in the range of 50 to 250 nm. The force S is preferably in the range of 100 to 200 nm.

[0049] On the surface side of the substrate on which the information recording layer is provided (the side on which the group is formed), for the purpose of improving flatness, improving adhesion, and preventing deterioration of the information recording layer, an undercoat layer May be provided.

Examples of the material for the undercoat layer include polymethyl methacrylate, acrylic acid 'methacrylic acid copolymer, styrene' maleic anhydride copolymer, polybutyl alcohol, N-methylol. Acrylamide, styrene butyl toluene copolymer, chlorosulfonated polyethylene, nitrocellulose, polychlorinated butyl, chlorinated polyolefin, polyester, polyimide, butyl acetate; chlorinated butyl copolymer, ethylene; butyl acetate copolymer, polyethylene, Examples thereof include polymer substances such as polypropylene and polycarbonate; and surface modifiers such as silane coupling agents. The undercoat layer is prepared by dissolving or dispersing the above substances in an appropriate solvent to prepare a coating solution, and then applying this coating solution to the substrate surface by a coating method such as spin coating, dip coating, or extrusion coating. Can be formed.

The thickness of the undercoat layer is generally in the range of 0.005 to 20 111, and preferably in the range of 0.01 to 10 / ζ πι.

[0050] When the optical disk of the present invention is of a read-only type, an information recording part in which information that can be reproduced by laser light is recorded is provided as a pit on the substrate. In this case, the information recording layer is not formed.

[0051] (Reflective layer)

For the purpose of improving reflectivity during information reproduction, a reflective layer (also referred to as a light reflecting layer) force S may be provided adjacent to the information recording layer and the ridge or the image recording layer. The light-reflective substance that is the material of the reflective layer has a high reflectivity with respect to laser light, and it is preferable to use the substance. The column includes Mg ゝ Se ゝ Y ゝ Ti ゝ Zr ゝ Hf ゝ V, Nb ゝ Ta ゝ Cr ゝ Mo, W ゝ Mn, Re ゝ Fe, Co, Ni, Ru, Rh, Pd, Ir, Pt, Examples include metals and metalloids such as Cu, Ag, Au, Zn, Cd, Al, Ga, In, Si, Ge, Te, Pb, Po, Sn, and Bi, or stainless steel. These substances may be used singly or in combination of two or more or as a metal alloy. Among these, Cr, Ni, Pt, Cu, Ag, Au, Al and stainless steel are preferable. Particularly preferred are Au metal, Ag metal, A1 metal or alloys thereof, and most preferred are Ag metal, A1 metal or alloys thereof. The reflective layer can be formed on the substrate or the information recording layer, for example, by vapor deposition, sputtering or ion plating of the light reflective material. The thickness of the reflective layer is generally in the range of 10 to 300 nm, and preferably in the range of 50 to 200 nm. [0052] (Adhesive layer)

The adhesive layer is provided to bond the laminates (the substrate on which the information recording layer is formed and the substrate on which the image recording layer is formed) to each other when a bonded optical disc such as a DVD is manufactured. As the material constituting the adhesive layer, a material having a low curing shrinkage is preferable in order to prevent disc warping even when a photocurable resin is preferred. Examples of such photocurable resins include SD-640 and SD-661 manufactured by Dainippon Ink & Chemicals, Inc., and SK6100, SK6300, and SK6400 manufactured by Sochemikanore Co., Ltd. I can help. In addition, the thickness of the adhesive layer is preferably 1 to: 5 to 60 m, more preferably 20 to 55 μm, and more preferably 1 to: LOO / zm. .

[0053] (Middle layer)

Basically, the same material as the adhesive layer can be used as the material of the intermediate layer. In other words, generally, an ultraviolet curing resin such as an acrylic resin can be used. As a method for forming the intermediate layer, a force die coating method or an ink jet method for which the spin coating method is simple and appropriate can be applied. The thickness is the same as in the case of the adhesive layer.

[0054] It is also possible to form a double-sided tape-like sheet made of a so-called pressure-sensitive adhesive called PS A (Pressure Sensitive Adhesive). This sheet may not require a support when an adhesive may be formed on the front and back of a base film such as PET, polycarbonate, or TAC. This sheet itself can be bonded by applying an adhesive to the base film by a web coating method, then punching it concentrically, and pressing it by a method such as a vacuum bonding method or a roller method. In addition, when there is no support, it is possible to transfer and apply once to the release material, then remove the release material to produce an adhesive sheet, and use this for bonding to form an intermediate layer. is there.

[0055] (Protective substrate)

The protective substrate (dummy substrate) is provided on the opposite side of the substrate in the case of a bonded optical disk. As the material, the same material as the above-mentioned “substrate” can be used. The thickness of the protective substrate is preferably 0.05-1 to 2mm, more preferably 0.1 to 1.1mm, and more preferably 0.5 to 0.7mm for DVD configurations. More preferably.

[0056] In the optical disc of the present invention, it corresponds to the image recording area on the image recording layer side described above. The protective substrate may have a tracking groove. When the image recording layer is formed adjacent to the above-described protective substrate, the groove can be easily provided in the image recording region by providing the protective substrate with a groove. By recording an image with the laser pickup being tracked by the formed groove, the position of the pickup can be precisely controlled, so that a precise image can be recorded. In addition, by providing grooves in the image recording layer, there is an effect that light can interfere and the surface can be broken!

When the groove is provided, the shape is preferably a spiral shape or a concentric shape since tracking is performed while the optical disk is rotated. The groove shape can be different from the groove shape of the information recording layer. Also, the groove pitch of the image recording layer and the groove pitch of the recording layer can be made different. Specifically, the pitch of the grooves of the image recording layer can be made wider than the grooves of the information recording layer. The purpose of tracking in image recording is to narrow down the groove pitch (track pitch) in order to increase the recording density if it is possible to record an image that can be viewed with high precision. It is.

[0058] From the viewpoint of the intensity distribution of the recording laser, the pitch of the tracking grooves formed in the image recording area of the image recording layer is preferably 0.3 to 200 m. S is preferably 0.6 to LOO m is more preferable, and 1.5 to 50 / ζ πι is even more preferable.

[0059] The depth of the groove is preferably 50 to 200 nm when tracking is performed during image recording and the thickness of the substrate on the laser incident side is 0.6 mm. More preferably, it is 150 nm, and more preferably 100 to 130 nm. The width of the groove is preferably 100 to 600 nm, more preferably 200 to 500 nm, and even more preferably 250 to 450 nm. Note that the optimum range of the groove shape may vary depending on the wavelength of the laser beam, NA, and substrate thickness. As a method for forming the groove in the image recording layer, a groove formed on the protective substrate by injection molding can be used.

[0060] (Transparent layer)

The transparent layer is provided on the opposite side of the substrate in the case of a configuration such as a CD. The transparent layer can be formed by a spin coating method. The rotational speed during spin coating is preferably 50 to 8000 rpm, more preferably 100 to 5000 rpm, from the viewpoint of uniform layer formation and prevention of damage to the recording layer! [0061] When an ultraviolet curable resin is used for the transparent layer, after forming the transparent layer by a spin coating method, the ultraviolet ray is irradiated by an ultraviolet irradiation lamp (metal halide lamp) on the transparent layer. Then, the ultraviolet curable resin is cured. Further, in order to eliminate the thickness unevenness of the transparent layer to be formed, a treatment such as leaving it for a certain period of time before curing the resin may be appropriately performed.

[0062] The material constituting the transparent layer is preferably an ultraviolet curable resin, among which ultraviolet curable resin, visible light curable resin, thermosetting resin, diacid silicate, and the like are preferable. I want to be there. Examples of the ultraviolet curable resin include ultraviolet curable resins such as “SD-6400” manufactured by Dainippon Ink and Chemicals, Inc. Also, SD-347 (manufactured by Dainippon Ink and Chemicals), SD-694 (manufactured by Dainippon Ink and Chemicals), SKCD1051 (manufactured by SKC), etc. can be used. The thickness of the transparent layer is preferably in the range of 1 to 200 / ζ πι, and more preferably in the range of 50 to 150 m. Further, since the transparent layer is used as a laser optical path, it is necessary to have transparency. Here, “transparency” means that the transmittance of the recording laser beam is 90% or more.

[0063] In the case of a Blu-ray disc that records and reproduces information with a laser beam having a wavelength of 450 nm or less, a cover layer is formed as a transparent layer. The cover layer is formed to prevent the inside of the optical disk from impact and the like, and is not particularly limited as long as it is a transparent material, but is preferably polycarbonate, cellulose triacetate, etc., more preferably moisture absorption at 23 ° C. and 50% RH. The material has a rate of 5% or less.

[0064] The cover layer is prepared by dissolving a photocurable resin constituting the adhesive layer in an appropriate solvent to prepare a coating solution, and then coating the coating solution on the recording layer at a predetermined temperature to form a coating film. For example, a cellulose triacetate film (TAC film) obtained by, for example, plastic extrusion is laminated on the coating film, and the upper force of the laminated TAC film is irradiated with light to cure the coating film. . The TAC film preferably contains a UV absorber. The thickness of the cover layer is in the range of 0.01 to 0.2 mm, preferably in the range of 0.03 to 0.1 mm, and more preferably in the range of 0.05 to 0.095 mm.

Moreover, a polycarbonate sheet etc. can also be used as a cover sheet.

[0065] The cover layer can be provided, for example, as follows. After preparing a coating solution by dissolving the photocurable resin in a suitable solvent, this coating solution is applied onto the recording layer at a predetermined temperature. A coating film is formed, and a cellulose triacetate film (TAC film) obtained by, for example, plastic extrusion is laminated on the coating film, and light is irradiated on the laminated TAC film to form the coating film. It is formed by curing. The TAC film preferably contains an ultraviolet absorber. The thickness of the transparent sheet is in the range of 0.01-0.2 mm, preferably in the range of 0.03 to 0.1 mm, and more preferably in the range of 0.05 to 0.095 mm. In addition, a polycarbonate sheet etc. can also be used as a cover layer. When a pressure-sensitive adhesive is applied to the bonding surface of the transparent sheet, the above adhesive is not necessary.

The cover layer (transparent sheet) is provided on the information recording layer side as shown in FIG. However, the cover layer material (transparent sheet, etc.) may be provided on the label side (printing area side in Fig. 5). In this case, the laser beam used for image recording is a laser beam used for information recording (for example, a blue-violet laser having a wavelength of 400 to 430 nm). A red laser having a wavelength of 650 to 670 nm or an infrared laser having a wavelength of 780 to 830 nm can be appropriately used.

[0067] Further, as shown in FIG. 5, it is preferable that a hard coat layer (corresponding to reference numeral 96 in FIG. 5) is further formed on the cover layer. By forming the hard coat layer, scratch resistance, antistatic function, antifouling property and the like of the surface of the optical information recording medium can be imparted.

[0068] The material of the hard coat layer is preferably a radiation-cured resin. Examples thereof include acrylic acid esters, methacrylic acid esters, methacrylic acid amides, allylic compounds, beryl ethers, and bull esters. The thickness of the hard coat layer is preferably 1 to 20 μm, more preferably 3 to 10 μm. The hard coat layer can be formed by preparing a coating solution containing a radiation-cured resin, applying the coating solution on the cover layer, and irradiating and curing the radiation (electron beam or ultraviolet ray). In order to increase the hardness, it is preferable to disperse ultrafine silica particles having a diameter of 10 to several tens of nm in the resin.

[0069] (Protective layer)

A protective layer may be provided for the purpose of physically and chemically protecting the reflective layer, the information recording layer, the image recording layer, and the like. In the case of DVD-type optical discs, it is not always necessary to provide a protective layer. [0070] Examples of materials used for the protective layer (including the transparent protective layer) include ZnS, ZnS-SiO, S

2 Inorganic materials such as iO, SiO, MgF, SnO, Si N, thermoplastic resin, thermosetting resin, UV

2 2 2 3 4

Mention may be made of organic substances such as curable resin. The protective layer can be formed, for example, by laminating a film obtained by extrusion of plastic on the reflective layer via an adhesive. Alternatively, it may be provided by a method such as vacuum deposition, sputtering, or coating. In some cases, the protective layer having the inorganic material force is formed as a transparent dielectric layer (corresponding to reference numeral 92 in FIG. 4).

[0071] Also, in the case of a thermoplastic resin or a thermosetting resin, it is possible to prepare a coating solution by dissolving these in a suitable solvent, and then apply the coating solution and dry it. Can be formed. In the case of UV curable resin, it can also be formed by applying this coating solution and curing it by irradiation with UV light. In these coating liquids, various additives such as an antistatic agent, an antioxidant and a UV absorber may be added according to the purpose. The thickness of the protective layer is generally in the range of 0 .: m to lmm. In this specification, the entire disclosure of Japanese Patent Application No. 2004-292817 is incorporated by reference.

[0072] [Recording method]

In the optical disc of the present invention, recording of an image on the image recording layer and recording of optical information on the information recording layer can be performed by one optical disc drive (recording device) having a recording function on both layers. Thus, when one optical disk drive is used, after recording on one of the image recording layer and the information recording layer, the recording layer can be turned over and recording can be performed on the other layer. Examples of the optical disk drive having a function of recording a visible image on the image recording layer are described in JP-A-2003-203348, JP-A-2003-242750, and the like.

[0073] When recording a visible image on the image recording layer, the recording apparatus tracks the optical disk and the laser pickup by a tracking groove formed in the image recording layer, and follows the surface of the optical disk. The laser beam is modulated in accordance with image data such as characters and pictures to be imaged and irradiated toward the image recording layer in synchronization with the relative movement, and a visible image is recorded. Such a configuration is described in, for example, JP-A-2002-203321. [0074] A recording apparatus that records optical information on the information recording layer has at least a laser pickup that emits laser light and a rotation mechanism that rotates an optical disc, and recording reproduction on the recording layer is rotated. Laser light is emitted from the laser pickup toward the recording layer of the optical disk in the state. The configuration of such a recording apparatus itself is well known.

Next, recording of information (digital information) on the information recording layer will be described below. When the information recording layer is a dye type, first, the laser pickup force laser light is irradiated while rotating the above-mentioned unrecorded optical disk at a predetermined recording linear velocity. By this irradiation light, the dye of the information recording layer absorbs the light and the temperature rises locally, and a desired void (pit) is generated and its optical characteristics are changed to record information.

In addition, a publicly known objective lens or laser used for the pickup can be used.

On the other hand, the case where the information recording layer is a phase change type will be described. In the case of the phase change type, it is composed of the above-described materials, and the phase change between the crystalline phase and the amorphous phase can be repeated by irradiation with laser light. During information recording, a focused laser light pulse is irradiated for a short time to partially melt the phase change recording layer. The melted part is rapidly cooled by thermal diffusion and solidifies to form amorphous recording marks. When erasing, the recording mark portion is irradiated with a laser beam, heated to a temperature below the melting point of the information recording layer and above the crystallization temperature, and then cooled to crystallize the amorphous recording mark, Return to the original unrecorded state. Industrial applicability

[0077] In the optical disc of the present invention, an image recording layer for forming an image with a laser beam is formed on a substrate, and a printing region is provided on at least a part of the substrate, the transparent layer, the transparent protective layer, or the protective substrate. Therefore, it becomes easy to determine the force of which image recording surface is located. Therefore, discrimination from other optical discs can be achieved, and discrimination can be imparted. Furthermore, it is possible to perform machine-identifiable printing such as barcodes.

Explanation of symbols

[0078] 10, 20 · · · Printing area

40 ... Board 50 Information recording layer 60 Reflective layer 70 Protective substrate 80 Image recording layer 90 Interlayer 100 Optical disk

Claims

The scope of the claims

[1] An optical disc in which an image recording layer for forming an image with a laser beam is formed on a substrate,

A transparent layer, a transparent protective layer or a protective substrate is provided on the image recording layer, and at least one printing area is provided on at least a part of the substrate, transparent layer, transparent protective layer or protective substrate on the image recording layer side. An optical disc characterized by being made.

[2] An optical disc in which an image recording layer for forming an image by a laser beam and an information recording layer are formed on a substrate,

A transparent layer, a transparent protective layer or a protective substrate is provided on the image recording layer, and one printing area is provided on at least a part of the substrate, the transparent layer, the transparent protective layer or the protective substrate on the image recording layer side. An optical disc characterized by being provided above.

3. The optical disc according to claim 1, wherein the printing area has an annular or non-annular shape and is provided continuously or intermittently.

[4] The outermost peripheral edge of the print area is outside the outer peripheral edge of the image recording layer, the inner peripheral edge of the print area is outside the inner peripheral edge of the image recording layer, and the outer peripheral edge of the image recording layer 4. The optical disc according to claim 3, wherein the optical disc is further inside.

[5] A reflective layer is provided on the image recording layer or the information recording layer, and the outer peripheral edge of the reflective layer is outside the outer peripheral edge of the respective image recording layer or information recording layer, and the outermost periphery of the printing area. 5. The end of the reflective layer is outside the outer peripheral end, and the inner peripheral end of the reflective layer is inside the inner peripheral end of each of the image recording layer or the information recording layer. Optical disc.

[6] The innermost peripheral edge of the print area is inside the inner peripheral edge of the image recording layer, the outer peripheral edge of the print area is outside the inner peripheral edge of the image recording layer, and the outer periphery of the image recording layer 4. The optical disk according to claim 3, wherein the optical disk is located inside the edge.

[7] A reflective layer is provided on the image recording layer or the information recording layer, and an inner peripheral end of the reflective layer is on an inner side than an inner peripheral end of each of the image recording layer or the information recording layer, and the printing The innermost peripheral edge of the region is inside the inner peripheral edge of the reflective layer, and the outer peripheral edge of the reflective layer is outside the outer peripheral edge of the respective image recording layer or information recording layer. Recorded in 6 An optical disc

8. The optical disc according to claim 2, wherein an intermediate layer is provided between the image recording layer and the information recording layer.

9. The optical disk according to claim 8, wherein the intermediate layer is formed as an adhesive layer.

10. The optical disc according to claim 2, wherein a transparent dielectric layer is provided on the image recording layer or the information recording layer.

[11] The optical disc according to claim 2, wherein the transparent layer is provided on the information recording layer side as a cover layer.

[12] The hard coat layer is further provided on the cover layer.

The optical disc according to 1.

13. The optical disk according to claim 1, wherein the printing region is selected from a group of materials such as an acrylic ester ultraviolet curable ink and a urethane ultraviolet curable ink.

14. The optical disk according to claim 1, wherein the thickness of the print area is 3 to 50 μm.

15. The optical disc according to claim 1, wherein the length of the print area in the radial direction is 1Z10 to 1Z2 of the radius of the optical disc.

16. The optical disk according to claim 3, wherein the non-circular shape of the print area is a shape selected from an elliptical shape, a sector shape, a rhombus shape, and a rectangular polygon shape.