WO2007058309A2 - Procede et appareil de production de support d'enregistrement optique - Google Patents

Procede et appareil de production de support d'enregistrement optique Download PDF

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Publication number
WO2007058309A2
WO2007058309A2 PCT/JP2006/322988 JP2006322988W WO2007058309A2 WO 2007058309 A2 WO2007058309 A2 WO 2007058309A2 JP 2006322988 W JP2006322988 W JP 2006322988W WO 2007058309 A2 WO2007058309 A2 WO 2007058309A2
Authority
WO
WIPO (PCT)
Prior art keywords
layer
stamper
resin
recording medium
optical recording
Prior art date
Application number
PCT/JP2006/322988
Other languages
English (en)
Japanese (ja)
Other versions
WO2007058309A3 (fr
Inventor
Atsushi Komura
Masafumi Aga
Yumi Matsumura
Kumi Mizuno
Original Assignee
Mitsubishi Kagaku Media Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Kagaku Media Co., Ltd. filed Critical Mitsubishi Kagaku Media Co., Ltd.
Priority to CN2006800413525A priority Critical patent/CN101300632B/zh
Publication of WO2007058309A2 publication Critical patent/WO2007058309A2/fr
Publication of WO2007058309A3 publication Critical patent/WO2007058309A3/fr
Priority to HK08113936.2A priority patent/HK1122894A1/xx

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
    • G11B7/263—Preparing and using a stamper, e.g. pressing or injection molding substrates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/021—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles characterised by the shape of the surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/14—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles in several steps
    • B29C43/146—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles in several steps for making multilayered articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/021—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles characterised by the shape of the surface
    • B29C2043/023—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles characterised by the shape of the surface having a plurality of grooves
    • B29C2043/025—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles characterised by the shape of the surface having a plurality of grooves forming a microstructure, i.e. fine patterning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/14—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles in several steps
    • B29C43/146—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles in several steps for making multilayered articles
    • B29C2043/147—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles in several steps for making multilayered articles by compressing after the laying of further material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2017/00—Carriers for sound or information
    • B29L2017/001—Carriers of records containing fine grooves or impressions, e.g. disc records for needle playback, cylinder records
    • B29L2017/003—Records or discs
    • B29L2017/005—CD''s, DVD''s

Definitions

  • the present invention relates to an optical recording medium manufacturing method and the like, and more particularly to a technique capable of manufacturing an optical recording medium with good recording characteristics at low cost.
  • an optical recording medium capable of further increasing the density of information as compared with the prior art.
  • an optical recording medium capable of increasing the density of information for example, a multilayer multi-layer optical recording medium such as a DVD-ROM having a laminated structure in which two recording layers are provided on a single medium (dual layer). Is mentioned. By using this multilayer technology, it is possible to increase the capacity without changing the recording density per layer.
  • a multilayer multilayer optical recording medium is usually manufactured by a manufacturing method called a photopolymerization method (hereinafter referred to as “2P method”).
  • 2P method for example, the first recording layer, the first reflective layer, the intermediate layer on which the concave / convex shape for the recording track is formed on the transparent first substrate on which the concave / convex shape for the recording track is formed, the second layer A recording layer and a second reflective layer are formed in this order, and finally a second substrate is bonded to produce a two-layer optical recording medium.
  • the intermediate layer is usually produced as follows. That is, first
  • a light curable resin raw material that is cured by light can be applied on the reflective layer to form a resin raw material layer, and then transferred onto this.
  • a stamper having a concavo-convex shape for copying (hereinafter referred to as “a concavo-convex shape for transfer” as appropriate) is placed.
  • the stamper is peeled off. In this way, the concavo-convex shape for transfer of the stamper is transferred to the surface of the photocurable resin, and the intermediate layer having the concavo-convex shape can be formed by a cured product of the curable resin.
  • the stamper after the photocurable resin is cured is smooth. It is desirable to peel off.
  • the photocurable resin and the stamper are difficult to peel off, or even if peeled off, the uniformity of the surface of the intermediate layer is reduced. If a manufacturing problem such as this occurs, defects such as scratching may occur in the intermediate layer, and it may become impossible to stably record and reproduce information with light stably on the optical recording medium. Because there is.
  • Patent Documents 1 and 2 the technique described in Patent Documents 2 and 3 for smoothly removing the stamper has been proposed.
  • Patent Document 2 proposes performing surface coating with an inorganic material on an acrylic resin stamper. And it is supposed that the said peeling can be performed favorably by it. Furthermore, this document uses an acrylic stamper in which a SiO dielectric film is formed on the surface of the groove / pit of the stamper (corresponding to the uneven shape for transfer).
  • Patent Document 3 the entire stamper is made of cyclic polyolefin or polystyrene resin, or at least the surface of the stamper on which the matrix pattern (corresponding to the concavo-convex shape for transfer) is formed is cyclic polyolefin or It has been proposed to be composed of polystyrene resins. It is described that the release property of the stamper with respect to the intermediate layer made of the cured product of the radiation curable resin can be thereby improved. Patent Document 3 states that the releasability of the stamper with respect to an intermediate layer made of a cured product of a cyclic polyolefin resin and a radiation curable resin is particularly improved.
  • Patent Document 1 Pamphlet of International Publication No. 2005Z048253 (paragraph [0100])
  • Patent Document 2 JP 2002-279707 A (paragraphs [0021], [0028])
  • Patent Document 3 Japanese Unexamined Patent Publication No. 2003-85839 (paragraphs [0006], [0016], [0046 to [0055], etc.)
  • the stamper used in the 2P method is used.
  • the following steps are required to coat the surface of a transparent inorganic material in advance. That is, it is necessary to form a dielectric film made of an inorganic material such as SiO to a predetermined thickness on a groove / information pit formed on the surface of the stamper by a vacuum sputtering apparatus or the like.
  • the cyclic polyolefin used in Patent Document 3 is an industrially excellent material having good releasability.
  • cyclic polyolefin is expensive because it is a special material, increasing the cost of the stamper. Since resin stampers are usually disposable, the actual cost of stampers in the entire optical recording medium is high.
  • the present invention has been made in view of the above-described problems, and an object of the present invention is to inexpensively manufacture an optical recording medium having a favorable uneven shape and an intermediate layer with few defects.
  • the inventors of the present invention have intensively studied to solve the above-mentioned problems.
  • the stamper is peeled off from the resin raw material layer in a heated state. I found it.
  • an intermediate layer having a good uneven shape can be obtained. It was.
  • the gist of the present invention is a method for producing an optical recording medium comprising at least a substrate, a recording layer, and an intermediate layer having a concavo-convex shape.
  • a step of forming the recording layer directly on the recording layer or via another layer, A step of forming a resin raw material layer; and a state in which a stamper having a concavo-convex shape for transfer corresponding to the concavo-convex shape is placed on the resin raw material layer, the resin raw material layer is cured, and the substrate, A step of obtaining an adhesive body including a recording layer, the resin raw material layer, and the stamper; and removing the stamper from the adhesive body, and transferring the concavo-convex shape for transfer to the resin raw material layer to form the intermediate layer.
  • the step of peeling off the stamper is performed in a state where the adhesive is heated (claim 1).
  • the temperature of the adhesive body when the stamper is peeled is 50 ° C or more (claim 2).
  • the temperature of the adhesive when the stamper is peeled is equal to or lower than the glass transition temperature of the stamper (claim 3).
  • the resin raw material layer is composed of a plurality of resin layers
  • the resin layer in contact with the stamper among the plurality of resin layers is an outermost resin layer
  • the temperature of the adhesive is preferably not more than the glass transition temperature of the stamper and the glass transition temperature after curing of the outermost resin layer (Claim 4).
  • the stamper is preferably made of a polycarbonate-based resin (Claim 5).
  • the resin material layer is preferably made of a radiation curable resin.
  • the optical recording medium is preferably a multilayer optical recording medium having two or more recording layers (claim 7).
  • Another gist of the present invention is an apparatus for manufacturing an optical recording medium comprising at least a substrate, a recording layer, and an intermediate layer having a concavo-convex shape.
  • a means for forming the recording layer a means for forming a resin raw material layer directly on the recording layer or via another layer, and a transfer corresponding to the uneven shape on the resin raw material layer.
  • Means for peeling the stamper, transferring the concavo-convex shape for transfer to the resin material layer, and forming the intermediate layer, and means for peeling the stamper The present invention resides in an apparatus for producing an optical recording medium, wherein peeling is performed in a state where the adhesive is heated (claim 8).
  • the stamper can be peeled favorably in a heated state, whereby a favorable uneven shape can be formed in the intermediate layer.
  • the reason for this is not clear, but it is presumed as (i) to (iv) below.
  • FIGS. 1 (a) to 1 (g) are schematic diagrams for explaining a preferred example of a method for producing an optical recording medium to which the first embodiment of the present invention is applied.
  • FIG. 1 is a schematic diagram for explaining a preferred example of a method for producing an optical recording medium to which the first embodiment of the present invention is applied.
  • FIGS. 2 (a) and 2 (b) are schematic diagrams for explaining a resin raw material layer forming step of an optical recording medium manufacturing method to which the second embodiment of the present invention is applied.
  • FIG. 2
  • FIG. 3 is a schematic diagram for explaining a resin raw material layer curing step of an optical recording medium manufacturing method to which the second embodiment of the present invention is applied.
  • FIG. 4 is a block diagram schematically showing an optical recording medium manufacturing apparatus as the first and second embodiments of the present invention.
  • FIG. 1 (a) to FIG. 1 (g) are schematic views for explaining a preferred example of a method for manufacturing an optical recording medium to which the first embodiment of the present invention is applied.
  • FIGS. 1 (a) to 1 (g) as an example of a method for producing a multilayer multilayer optical recording medium, a dual layer type single-sided incident type having two recording layers containing an organic dye is shown.
  • a method for producing an optical recording medium single-sided dual-layer DVD-R or single-sided dual-layer DVD recordable disc) is shown.
  • a single-sided dual-layer optical recording medium 100 represented by a single-sided dual-layer DVD-R includes a disc-shaped first substrate 101 that is transparent to light.
  • a first recording layer 102 containing a dye On the substrate 101, a first recording layer 102 containing a dye, a translucent first reflective layer 103, a light-transmissive intermediate layer 104 that also has an ultraviolet curable resin power, a second recording layer 105 containing a dye,
  • the second reflective layer 106, the adhesive layer 107, and the second substrate 108 forming the outermost layer have a structure in which they are laminated in order.
  • irregularities are respectively formed on the first substrate 101 and the intermediate layer 104, and these irregularities respectively constitute recording tracks. That is, the first substrate 101 and the intermediate layer 104 are the same.
  • the concavo-convex shape on each surface (that is, the above-mentioned concavo-convex shape) is the shape of the recording track.
  • recording / reproduction of optical information on the optical recording medium 100 is performed by laser light 109 irradiated to the first recording layer 102 and the second recording layer 105 from the first substrate 101 side. That is, information is recorded and reproduced on the first recording layer 102 and the second recording layer 105 by the irradiated laser beam 109.
  • light transmission means light with respect to the wavelength of light irradiated for recording and reproducing optical information. It means transparency.
  • the light transmittance means that the light wavelength for recording / reproducing is usually 30% or more, preferably 50% or more, more preferably 60% or more.
  • the transparency to the wavelength of light for recording / reproduction is ideally 100%, which is usually 99.9% or less.
  • the optical recording medium manufacturing method of the present embodiment includes a first recording layer forming step, a first reflective layer forming step, a resin raw material layer forming step, a resin raw material layer curing step, a stamper peeling step, and a second recording layer.
  • the first substrate 101 is prepared.
  • a substrate having an uneven surface and grooves, lands, and pre-pits is prepared.
  • the first substrate 101 can be manufactured by injection molding using a nickel stamper, for example.
  • the first recording layer 102 is formed on the first substrate 101.
  • it can form by the following method. That is, a coating solution containing an organic dye is applied to the surface of the first substrate 101 having the unevenness by spin coating or the like. Thereafter, heating or the like is performed to remove the solvent used in the coating solution, and the first recording layer 102 is formed.
  • the first recording layer 102 is formed directly on the first substrate 101 as described above will be described.
  • the first recording layer 102 is different from the type and configuration of the optical recording medium 100. Other layers on the first substrate 101 Even if you want to form through.
  • the first reflective layer 103 is formed on the first recording layer 102 in the first reflection forming step.
  • the method for forming the first reflective layer 103 is not limited.
  • the first reflective layer 103 is formed on the first recording layer 102 by sputtering or vapor-depositing an Ag alloy or the like on the first recording layer 102. be able to.
  • the data substrate 111 is obtained by sequentially stacking the first recording layer 102 and the first reflective layer 103 on the first substrate 101.
  • the data board 111 is transparent.
  • a resin raw material layer is formed on the entire surface of the first reflective layer 103 (that is, the surface of the data substrate 111). That is, the resin raw material layer 104 a is formed on the first recording layer 102 via the first reflective layer 103.
  • the resin raw material layer 104a formed here is a layer that will form the intermediate layer 104 when the optical recording medium 100 is completed, and is formed of a curable resin or a precursor thereof that can be cured by any treatment. Is a layer.
  • the resin raw material layer 104a is formed as follows.
  • a curable resin that can be used for an optical recording medium can be arbitrarily used.
  • the curable resin include a radiation curable resin and a thermosetting resin.
  • the resin raw material layer 104a is formed using a thermoplastic resin, a thermosetting resin or the like, it is usually sufficient to prepare a coating solution by dissolving the thermoplastic resin or the like in an appropriate solvent and apply this coating solution.
  • the intermediate layer 104 can be formed by drying (heating) the resin raw material layer 104a.
  • the resin raw material layer 104a is formed using a radiation curable resin, it is usually sufficient to prepare a coating solution as it is or after dissolving in an appropriate solvent, and apply this coating solution.
  • the intermediate layer 104 can be formed by curing the resin raw material layer 104a by irradiating with appropriate radiation.
  • an ultraviolet curable resin which is a kind of radiation curable resin is preferable.
  • radiation is used in the meaning including electron beam, ultraviolet ray, visible light, and infrared ray.
  • the curable resins may be used alone or in combination of two or more in any combination and ratio.
  • the resin raw material layer 104a is in an indefinite state (usually predetermined) before being formed in the resin raw material layer curing step. In a liquid state having a viscosity of
  • the method of forming the resin raw material layer 104a there is no limitation on the method of forming the resin raw material layer 104a, and a method such as a coating method such as a spin coating method or a casting method is used. Among these, the spin coat method is preferable. In particular, when a high-viscosity resin is used, it can be applied and formed by screen printing or the like. When the spin coating method is employed, for example, the resin raw material layer 104a can be formed by applying a curable resin precursor by spin coating or the like.
  • a precursor of an ultraviolet curable resin which is one of radiation curable resins, is applied by spin coating, and a resin raw material layer (hereinafter referred to as an “ultraviolet curable resin raw material layer” for convenience of explanation). ) 104a shall be formed.
  • the ultraviolet curable resin material layer 104a is formed on the first recording layer 102 via the first reflective layer 103 as described above.
  • the linear curable resin raw material layer 104a may be formed directly on the first recording layer 102 depending on the type and configuration of the optical recording medium 100, and other than the first reflective layer 103. Even if you want to form through layers.
  • the stamper 110 is placed on the ultraviolet curable resin raw material layer 104a, and the ultraviolet curable resin raw material layer 104a is cured. That is, the stamper 110 is placed on the surface of the ultraviolet curable resin material layer 104a opposite to the first recording layer 102.
  • the stamper 110 is a mold having on its surface irregularities (transfer irregularities) having a shape (uneven shape for transfer) corresponding to the irregular shape (uneven shape) to be formed in the intermediate layer 104. Then, the unevenness for transfer of the unevenness for transfer included in the stamper 110 is transferred to the ultraviolet curable resin raw material layer 104a, whereby the unevenness having a desired uneven shape is formed in the intermediate layer 104. The uneven shape for transfer is set.
  • the material of the stamper 110 in consideration of the manufacturing cost of the optical recording medium 100, a resin is usually used. As will be described later, it is preferable that the ultraviolet rays for curing the ultraviolet curable resin raw material layer 104 a are irradiated through the stamper 110. Therefore, if an opaque material such as a metal is used as the material of the stamper 110, it becomes impossible to irradiate ultraviolet rays through the stamper 110. In such a case, the resin raw material layer cannot be sufficiently cured by ultraviolet rays, which may adversely affect the deterioration of each layer.
  • the stamper 110 is peeled off in a heating environment, there is an advantage that the degree of freedom of the material used for the stamper 110 is greatly expanded. That is, conventionally, from the viewpoint of reducing the surface energy when the stamper 110 is formed, a polyolefin resin, a polystyrene resin, or the like is preferable as the resin forming the stamper 110. Actually, amorphous cyclic polyolefin resins (for example, ZEONEX and ZENOOR (both manufactured by Nippon Zeon Co., Ltd.)) are in practical use.
  • the present invention is not limited to the high-functionality resin as described above, and it is possible to use a general-purpose and low-cost resin such as a polycarbonate resin and an acrylic resin. From the viewpoint of remarkably exhibiting the above advantages, it is preferable to use a polycarbonate resin or an acrylic resin as the material of the stamper 110. More preferably, it is a polycarbonate resin. Note that the stamper 110 may be used alone or in combination of two or more in any combination and ratio.
  • the stamper 110 is usually formed in a disc shape in which a central hole penetrating the front and back is formed in the central portion. Also in this embodiment, it is assumed that the stamper 110 has a disk-like shape having an uneven shape for transfer on the surface and a center hole (not shown) formed in the center.
  • the manufacturing method is arbitrary.
  • the stamper 110 is a resin stamper
  • the stamper 110 has a reverse (negative) shape of the uneven shape for transfer. It can be produced by injection molding or the like using a metal stamper having a concavo-convex pattern (for example, a nickel stamper).
  • the thickness of the stamper 110 used in the present embodiment depends on shape stability and In view of ease of handling, it is usually desirable that the thickness be 0.3 mm or more. However, the thickness is usually 5 mm or less. If the thickness of the stamper 110 is within this range, the stamper 110 has sufficient light transmissivity. Therefore, even if it is irradiated with ultraviolet rays through the stamper 110 as described later, it is possible to efficiently cure the ultraviolet curable resin or the like. Yes, productivity can be improved.
  • the outer diameter of the stamper 110 is preferably larger than the outer diameter of the first substrate 101 (usually equal to the outer diameter of the optical recording medium 100). If the outer diameter of the stamper 110 is designed to be larger than the outer diameter of the first substrate 101 in advance, when the stamper 110 is manufactured by injection molding, there is a margin in the outer peripheral portion outside the outer diameter of the first substrate 101. Therefore, it is possible to form a concavo-convex shape for transfer with a thickness, and a favorable concavo-convex shape for transfer can be formed over the entire surface of the stamper 110.
  • the outer diameter of the stamper 110 is larger than the outer diameter of the intermediate layer 104 (and the ultraviolet curable resin raw material layer 104a). Becomes bigger. In this way, the shape of the end face of the intermediate layer 104 becomes good.
  • the outer diameter of the stamper 110 is set to be equal to or smaller than the outer diameter of the first substrate 101, when the stamper 110 is placed on the ultraviolet curable resin raw material layer 104a, the outer periphery of the stamper 110 is exposed to ultraviolet rays.
  • the resin of the curable resin raw material layer 104a may adhere. This resin may become a burr when the stamper 110 is peeled off.
  • the outer diameter of the stamper 110 is larger than the outer diameter of the intermediate layer 104 (ultraviolet curable resin raw material layer 104a), the resin present at the end of the ultraviolet curable resin raw material layer 104a that tends to become burrs is removed. It exists outside the outer diameter of. As a result, even if a nodule is generated, the shape of the end face of the intermediate layer 104 can be improved by removing the nodule generation part.
  • the outer diameter of the stamper 110 is larger than the outer diameter of the first substrate 101 by usually 1 mm or more, preferably 2 mm or more.
  • the extent to which the outer diameter of the stamper 110 is larger than the outer diameter of the first substrate 101 is usually 15 mm or less, preferably 10 mm or less.
  • the stamper 110 when the stamper 110 is placed, the stamper 110 is placed so that the uneven surface of the stamper 110 is pressed against the ultraviolet curable resin raw material layer 104a. At this time, the degree to which the stamper 1 10 is pressed against the ultraviolet curable resin raw material layer 104a is determined by the degree to which the ultraviolet curable resin raw material layer 10a is pressed. The adjustment is performed so that the film thickness of 4a is within a predetermined range.
  • the ultraviolet curable resin raw material layer 104a is cured in a state where the stamper 110 is placed on the ultraviolet curable resin raw material layer 104a.
  • the ultraviolet curable resin raw material layer 104a may be irradiated with ultraviolet rays.
  • the irradiation method of ultraviolet rays is not limited. Irradiation may be performed through the stamper 110, irradiation may be performed from the side surface of the ultraviolet curable resin raw material layer 104a, and irradiation may be performed from the first substrate 101 side. Temoyore.
  • a stamper 110 capable of transmitting ultraviolet rays (light transmissive one).
  • ultraviolet rays light transmissive one
  • the ultraviolet curable resin precursor layer 104a is irradiated with ultraviolet rays from the stamper 110 side through the stamper 110 to polymerize the precursor of the ultraviolet curable resin, so that the ultraviolet curable resin is polymerized.
  • the description will be made assuming that the raw material layer 104a is cured.
  • the resin material layer 104a is cured, and the data substrate 111 (that is, the first substrate 101, the first recording layer 102, and the first reflective layer 103), the ultraviolet curable resin material layer 104a, and the stamper An adhesive body 112 with 1 10 is obtained.
  • the stamper 110 is peeled from the ultraviolet curable resin raw material layer 104a (see FIG. 1 (c)) (that is, from the adhesive 112).
  • the uneven shape for transfer of the stamper 110 is transferred to the ultraviolet curable resin raw material layer 104a, and the intermediate layer 104 is formed.
  • the UV curable resin material layer 104a refers to a layer before being hardened after application and before the stamper is peeled off.
  • the intermediate layer 104 is a layer after the stamper 110 is peeled off. Therefore, the ultraviolet curable resin raw material layer 104a and the intermediate layer 104 are different in force and state indicating the layers formed at the same position.
  • the specific method for peeling the stamper 110 is not limited, but normally, the optical recording medium is a circle. In the case of a disk shape, the inner circumference is vacuum-sucked, a knife edge is inserted into the inner circumference of the optical recording medium, and the disk (optical recording medium laminate 113 described later) and the stamper 110 are attached while blowing air there. Peeling is performed by pulling apart.
  • the above-described stamper 110 is peeled off while the adhesive 112 is heated.
  • the stamper 110 is peeled in the heated state, it is possible to perform good peeling, and it is possible to obtain the intermediate layer 104 having a good uneven shape.
  • the heating operation may be performed at any time. That is, in the present invention, the “heated state” does not mean the temperature raising operation itself, but means that a predetermined portion is set to a temperature higher than room temperature described later. Therefore, for example, all the steps of the method for producing an optical recording medium of the present invention may be performed in a heating environment by keeping the production line system itself at a high temperature. Further, for example, the heating operation may be performed in any step prior to the stamper peeling step. Further, a heating operation may be performed in the stamper peeling step after the ultraviolet ray curable resin raw material layer 104a is cured.
  • the stamper 110 can be peeled off by utilizing the difference in the temperature dependence of the shrinkage rate and expansion rate of the materials constituting the ultraviolet curable resin layer 104a and the stamper 110. It is. [0059] Further, the number of heating operations is not limited to one, and may be two or more.
  • the temperature (heating temperature) of the adhesive 112 when the stamper 110 is peeled is arbitrary as long as the stamper is peeled well.
  • the heating temperature is usually higher than room temperature (usually 25 ° C ⁇ 5 ° C in Japan).
  • peeling is performed in a state where the temperature of the adhesive 112 is normally maintained at a temperature of 50 ° C. or higher, preferably 70 ° C. or higher.
  • the upper limit of the heating temperature is preferably not more than the glass transition temperature after curing of the intermediate layer 104, that is, the resin raw material layer (in this embodiment, the ultraviolet ray curable resin raw material layer) 104a.
  • the upper limit of the heating temperature is preferably set to be equal to or lower than the glass transition temperature of the stamper 110. That is, it is preferable that the upper limit of the heating temperature is not higher than the glass transition temperature after curing of the resin raw material layer 104a and the glass transition temperature of the stamper 110. This is to make the uneven shape formed on the surface of the intermediate layer 104 better while taking into account the shrinkage and expansion of the stamper 110 and the resin raw material layer 104a.
  • the heating temperature of adhesive 112 is the lower of the two glass transition temperatures. It is preferable to set it below the temperature. Further, the heating temperature is 20 ° higher than the glass transition temperature based on the lower glass transition temperature of the glass transition temperature of the stamper 110 and the glass transition temperature after curing of the resin raw material layer. It is preferable to lower C or more. More preferably, it is 30 ° C or more lower than the glass transition temperature. By setting the heating temperature to such a temperature setting, the uneven shape formed on the surface of the intermediate layer 104 can be made better.
  • the heating method and the heating apparatus are not limited, but it is desirable to heat the entire surface of the adhesive 112 uniformly.
  • an oven-type heating device a heating method using an infrared lamp, a heating method using infrared rays, or the like is suitable.
  • a temperature sufficient for peeling off the stamper 110 can be obtained by heating for several seconds, which is preferable.
  • the heating time is not limited as long as the adhesive body 112 is in the heating state.
  • the temperature of the adhesive 112 can be measured with a non-contact type thermometer (for example, non-contact type thermometer IT2-60 of KEYENCE Corporation).
  • the temperature of the bonding body 112 in the present invention means the temperature of the resin raw material layer 104a. Further, when the temperature of the resin raw material layer 104a cannot be directly measured in a state where the stamper 110 is placed, it means the temperature of the stamper 110 which is a layer in contact with the resin raw material layer 104a.
  • the intermediate layer 104 is formed on the surface of the ultraviolet curable resin raw material layer 104a by transferring the shape of the unevenness for transfer of the stamper 110 (ie, the uneven shape for transfer) to the first layer.
  • an optical recording medium laminate 113 including the substrate 101, the first recording layer 102, the first reflective layer 103, and the intermediate layer 104 can be obtained (see FIG. 1 (d)).
  • the stamper 110 is peeled off in a heated state, so that the intermediate layer 104 and the stamper 110 can be easily applied without applying an excessive load. Can be peeled off. As a result, it is possible to form a good uneven shape on the intermediate layer 104. Further, the possibility that the first recording layer 102 and the first reflective layer 103 are deformed is reduced. Furthermore, by maintaining the uniformity of the surface of the intermediate layer 104, the signal waveform for recording and reproducing optical information can be stabilized. Therefore, it is possible to form the intermediate layer 104 having a good uneven shape and few defects.
  • the intermediate layer 104 and the stamper 110 can be easily peeled off without applying an excessive load. Hardly adheres to curable resin residues. This makes it easier to reuse the stamper 110.
  • the intermediate layer 104 and the stamper 110 can be easily separated, so that the degree of freedom of the material used for the stamper 110 is greatly increased. Can do.
  • the second recording layer 105 is formed on the intermediate layer 104 as shown in FIG.
  • the method for forming the second recording layer 105 is not limited.
  • the second recording layer 105 can be formed by the following method. In other words, a coating solution containing an organic dye is intermediated by spin coating or the like. Apply to layer 104 surface. Then, heating or the like is performed to remove the solvent used in the coating solution, and the second recording layer 105 is formed. By repeating [4. Resin raw material layer forming step] to [7. Second recording layer forming step], a multilayer multilayer optical recording medium can be efficiently produced.
  • the second recording layer 105 is formed directly on the intermediate layer 104, depending on the type and configuration of the optical recording medium 100, other layers (for example, The second recording layer 105 may be formed via a protective layer or a buffer layer).
  • the second reflective layer 106 is formed on the second recording layer 105 as shown in FIG. 1 (f).
  • the method for forming the second reflective layer 106 is not limited.
  • the second reflective layer 106 can be formed on the second recording layer 105 by sputtering vapor deposition of an Ag alloy or the like.
  • the second substrate 108 is formed on the second reflective layer 106 as shown in FIG.
  • the method for forming the second substrate 108 is not limited.
  • the second substrate 108 can be bonded to the second reflective layer 106 with the adhesive layer 107 interposed therebetween.
  • the second substrate 108 is not limited, but here, a mirror substrate obtained by injection molding of polycarbonate is used as the second substrate 108.
  • the configuration of the adhesive layer 107 is arbitrary.
  • the adhesive layer 107 may be transparent or opaque. Further, the surface may be somewhat rough. Furthermore, even delayed-cure adhesives can be used without problems.
  • the adhesive layer 107 is formed by applying an adhesive on the second reflective layer 106 by a method such as screen printing, irradiating ultraviolet rays, placing the second substrate 108, and pressing the second substrate 108. It may be. It is also possible to form the adhesive layer 107 by pressing a pressure sensitive double-sided tape between the second reflective layer 106 and the second substrate 108.
  • an optical recording medium 100 having a layer structure as shown in FIG. 1 (g) can be obtained.
  • the layer configuration shown in FIG. 1 (g) is merely an example.
  • other layers (not shown in FIG. 1 (g), for example, the first substrate 101) may be formed by the optical recording medium manufacturing method of this embodiment.
  • steps other than the steps described above may be performed before, during, and after each step described above.
  • Such an optical recording medium manufacturing method of the present embodiment can be performed by, for example, an optical recording medium manufacturing apparatus 1 as shown in FIG. That is, the manufacturing apparatus 1 includes a first recording layer forming apparatus 2 that performs the operation of the first recording layer forming process, a first reflective layer forming apparatus 3 that performs the operation of the first reflecting layer forming process, and a resin raw material.
  • the manufacturing apparatus 1 includes a first recording layer forming apparatus 2 that performs the operation of the first recording layer forming process, a first reflective layer forming apparatus 3 that performs the operation of the first reflecting layer forming process, and a resin raw material.
  • Resin raw material layer forming apparatus 4 for performing the layer forming process
  • Resin raw material layer curing apparatus 5 for performing the resin raw material layer curing process
  • Stamper peeling apparatus 6 for performing the stamper peeling process
  • the second recording layer A second recording layer forming apparatus 7 for performing a forming process operation
  • a second reflecting layer forming apparatus 8 for performing a second reflecting layer forming process
  • a second substrate forming apparatus 9 for performing a second substrate forming process
  • the optical recording medium 100 and an intermediate product in the process of manufacturing the optical recording medium 100 and the conveying device 10 for conveying the intermediate product between these devices 2 to 9 in the order described above.
  • the manufacturing apparatus 1 includes means (first recording layer forming apparatus 2) for forming the first recording layer 102 on the first substrate 101 directly or via another layer, and the first recording layer.
  • the resin raw material layer 104a is cured in a state where the stamper 110 having the above is mounted, and the adhesive 107 including the first substrate 101, the first recording layer 102, the resin raw material layer 104a, and the stamper 110 is obtained ( A resin raw material layer curing device 5) and means (a stamper peeling device 6) for peeling the stamper 110 from the adhesive 107 and transferring the uneven shape for transfer to the resin raw material layer 104a to form the intermediate layer 104, and , Means for peeling off the stamper 110 (stamper peeling device 6) force The peeling is performed with the adhesive 107 heated.
  • the manufacturing method of the optical recording medium described above is carried out by the manufacturing apparatus 1, and an optical recording medium having a good concavo-convex shape and an intermediate layer with few defects can be manufactured at a low cost.
  • the manufacturing apparatus 1 illustrated here is an example of a manufacturing apparatus for carrying out the above-described optical recording medium manufacturing method, and the optical recording medium manufacturing apparatus of the present invention is not limited to this.
  • the present invention can be arbitrarily modified and implemented without departing from the gist of the present invention.
  • the devices 2 to 10 can be combined arbitrarily.
  • the manufacturing apparatus 1 can be configured in combination with another apparatus not listed here.
  • the apparatuses 2 to 10 may be incorporated in one manufacturing apparatus 1 as in this example, and the apparatuses 2 to 10 that are separately configured may constitute the manufacturing apparatus 1 as a whole. May be.
  • one apparatus may have the functions of different apparatuses in the manufacturing apparatus 1. Examples thereof include the first recording layer forming apparatus 2 and the second recording layer forming apparatus 7, or the first reflecting layer forming apparatus 3 and the second reflecting layer forming apparatus 8.
  • the resin raw material layer may be formed from a plurality of resin layers in consideration of the warp of the optical recording medium, the recording characteristics of the recording layer formed on the intermediate layer, and the like. .
  • the resin layer that is in contact with the stamper and has an uneven shape is the outermost resin layer.
  • the number of resin layers constituting the resin raw material layer is not particularly limited. Specifically, the number of the resin layers is usually 10 layers or less, preferably 5 layers or less, more preferably 4 layers or less. On the other hand, the number of the resin layers is two or more. However, from the viewpoint of production efficiency, the number of resin layers constituting the resin raw material layer is preferably 2 or more and 5 or less. From the viewpoint of production efficiency, it is particularly preferable that the number of resin layers constituting the resin raw material layer is a two-layer or three-layer structure.
  • the resin raw material layer has a two-layer resin layer force
  • the method for forming the resin raw material layer and the method for placing the stamper are changed with respect to the first embodiment.
  • the resin for forming the resin raw material layer 104 it is assumed that an ultraviolet curable resin is used as in the first embodiment.
  • the substrate preparation, the first recording layer forming step, and the first reflective layer forming step are performed in the same manner as in the first embodiment. And a resin raw material layer formation process is performed after that.
  • FIGS. 2 (a) and 2 (b) are schematic diagrams for explaining the resin raw material layer forming step of the method for manufacturing an optical recording medium to which the second embodiment of the present invention is applied.
  • 2 (a) and 2 (b) parts similar to those in FIGS. 1 (a) to 1 (g) are denoted by the same reference numerals as those in FIGS. 1 (a) to 1 (g). To explain.
  • the stamper 110 on which the second resin layer 104a is formed is placed, and the first resin layer 104a is connected to the second resin layer 104a.
  • An ultraviolet curable resin raw material layer 104a (see FIG. 3) is formed from the oil layer 104a. That is,
  • the stamper 110 is placed on the ultraviolet curable resin raw material layer 104a.
  • the stamper 110 is placed on the ultraviolet curable resin raw material layer 104a.
  • the ultraviolet curable resin raw material layer 104a As shown in FIG. 2 (a), data composed of the first substrate 101, the first recording layer 102, and the first reflective layer 103 is used. A first resin layer 104a is formed on the substrate 111.
  • the manufacturing method of the data substrate 111 is the first
  • the ultraviolet curable resin raw material layer 104a can be formed in the same manner.
  • the stamper 110 As shown in FIG. 2 (b), the second resin layer 104a is formed on the surface having the uneven shape for transfer.
  • the stamper 110 is the same as that of the first embodiment.
  • the method for forming the second resin layer 104a is not limited, for example, the surface of the stamper 110
  • the whole can be formed by applying a precursor of an ultraviolet curable resin by spin coating or the like.
  • the second resin layer is formed so that the first resin layer 104a and the second resin layer 104a face each other.
  • the stamper 110 on which the 104a is formed is connected to the data substrate 111 on which the first resin layer 104a is formed. Place on top. As a result, the entire surface of the data substrate 111 (ie, the surface of the first reflective layer 103) is coated with the ultraviolet curable resin material layer 104 composed of the first resin layer 104a and the second resin layer 104a.
  • the ultraviolet curable resin material layer 104 a is formed on the first recording layer 102 via the first reflective layer 103.
  • the stamper 110 having the concavo-convex shape for transfer is placed on the ultraviolet curable resin raw material layer 104a.
  • the stamper 110 is placed on the surface of the ultraviolet curable resin raw material layer 104a opposite to the first recording layer 102.
  • the force that presses the stamper 110 against the data substrate 111 is adjusted so that the film thickness of the UV curable resin raw material layer 104a is within a predetermined range.
  • FIG. 3 is a schematic diagram for explaining the resin raw material layer curing step of the method of manufacturing an optical recording medium to which the second embodiment of the present invention is applied.
  • FIGS. 1 (a) to 1 (g), 2 (a) and 2 (b) are shown in FIGS. 1 (a) to 1 (g) and 2 (a) is explained with the same reference numerals as in Fig. 2 (b).
  • the favorable intermediate layer 104 is formed by peeling the stamper 110 from the ultraviolet resin raw material layer 104a while the adhesive 112 ′ is heated. Can do.
  • the upper limit of the temperature (heating temperature) of the adhesive body 1 1 2 ′ when the stamper 110 is peeled off is determined by the glass transition temperature of the stamper 110 and the outermost resin layer. It is preferable that the second resin layer 104a is not higher than the glass transition temperature after curing.
  • the glass transition temperature of the stamper 110 and the glass transition temperature after the second resin material layer 104a is cured are cured.
  • the heating temperature of the adhesive 112 ′ is preferably set to the lower one of the above glass transition temperatures. Furthermore, the above heating temperature depends on the glass transition temperature of the stamper 110 and the cured resin of the second resin material layer 104a (outermost resin layer).
  • the glass transition temperature it is preferable to lower the glass transition temperature by 20 ° C. or more on the basis of the lower one of the glass transition temperatures. More preferably, it is lower by 30 ° C. or more than the glass transition temperature.
  • the subsequent second recording layer forming step, second reflecting layer forming step, and second substrate forming step may be performed in the same manner as in the first embodiment.
  • an optical recording medium 100 (see FIG. 1 (g)) having an excellent concavo-convex shape and having the intermediate layer 104 with few defects can be manufactured. Further, according to the method for manufacturing an optical recording medium of the present embodiment, the same advantages as those of the first embodiment can be obtained.
  • the ultraviolet curable resin raw material layer 104a is constituted by a plurality of resin layers (the first resin layer 104a and the second resin layer 104a) in order to form the intermediate layer 104.
  • the first resin layer 104a is harder than the second resin layer 104a.
  • a resin having a low glass transition temperature after conversion to 1 2 can be used.
  • the first resin layer 104a is 20 ° C lower than the glass transition temperature after the second resin layer 104a is cured,
  • the first recording layer formation for performing the operation of the first recording layer forming step as shown in FIG. 4 is performed.
  • Apparatus 2 first reflective layer forming apparatus 3 for performing the operation of the first reflective layer forming process, and resin raw material layer forming process
  • Resin raw material layer forming apparatus 4 for performing operations
  • resin raw material layer curing apparatus 5 for performing operations of the resin raw material layer curing process
  • stamper peeling apparatus 6 for performing operations of the stamper peeling process
  • operations of the second recording layer forming process A second recording layer forming apparatus 7 for performing the operation, a second reflecting layer forming apparatus 8 for performing the operation of the second reflecting layer forming process, a second substrate forming apparatus 9 for performing the operation of the second substrate forming process, and an optical recording medium 100 and an intermediate product in the middle of its manufacture can be carried out by a manufacturing apparatus 1 comprising a transport apparatus 10 for transporting between these apparatuses 2 to 9 in the order described above.
  • the power can be changed arbitrarily and implemented.
  • optical recording medium to be manufactured a dual layer type single-sided dual-layer DVD-R having two recording layers containing an organic dye has been described as an example.
  • the optical recording medium to which the optical recording medium manufacturing method and manufacturing apparatus of the present invention can be applied is not limited to this. That is, it has at least a substrate, a recording layer, and an intermediate layer having a concavo-convex shape, and a resin raw material layer is formed on the recording layer directly or via another layer, and is transferred onto the resin raw material layer.
  • It includes a step of placing a stamper having an uneven shape, curing the resin raw material layer, peeling the stamper from the resin raw material layer, and transferring an uneven shape for transferring the stamper to the resin raw material layer to form an intermediate layer
  • the present invention can be applied to any optical recording medium or laminated body for an optical recording medium manufactured by the manufacturing method, and thereby the effects of the present invention can be exhibited well. Therefore, for example, the optical recording medium manufacturing method and manufacturing apparatus of the present invention can be applied to optical recording media having other configurations.
  • optical recording medium manufacturing method and manufacturing apparatus of the present invention can be applied to an optical recording medium having only one recording layer.
  • the method and apparatus for producing an optical recording medium of the present invention can be applied to an optical recording medium having three or more recording layers and two or more intermediate layers.
  • the intermediate layer described in the above embodiment A forming method can be applied.
  • an optical recording medium to which the manufacturing method and manufacturing apparatus of the optical recording medium of the present invention can be applied, a write once medium (CD-R, DVD-R, etc.) that can be recorded only once is used.
  • a write once medium CD-R, DVD-R, etc.
  • rewritable media that can be repeatedly recorded and erased
  • ROM media such as CD-ROM and DVD-ROM
  • the method and apparatus for producing an optical recording medium of the present invention is preferable because it can exhibit stable recording and reproducing characteristics when applied to a write-once medium.
  • the first substrate 101 is desirably excellent in optical characteristics, such as being light transmissive and having a low birefringence. Further, the first substrate 101 is preferably excellent in moldability such as easy injection molding. Furthermore, it is desirable that the first substrate 101 has a low hygroscopic property. Further, it is desirable that the first substrate 101 has shape stability so that the optical recording medium has a certain degree of rigidity.
  • the material constituting the first substrate 101 is not particularly limited.
  • the material is an allylic resin, a methacrylic resin, a polycarbonate resin, a polyolefin resin (especially amorphous polyolefin), or a polyester resin. , Polystyrene resin, epoxy resin, glass and the like.
  • substrate 101 may be used individually by 1 type, and may use 2 or more types by arbitrary combinations and ratios.
  • the thickness of the first substrate 101 is usually 2 mm or less, preferably 1.1 mm or less.
  • optical properties, hygroscopicity, moldability, shape In order to obtain sufficient stability, it is usually 10 xm or more, preferably 30 zm or more.
  • the first recording layer 102 has higher sensitivity than the recording layer used for optical recording media usually used for CD-R, single-sided DVD-R, and the like.
  • the first reflective layer 103 is usually a translucent reflective film. For this reason, half of the incident laser beam 109 is transmitted through the first reflective layer 103. As a result, the power of the laser beam 109 incident on the first recording layer 102 is halved. Therefore, since the recording on the first recording layer 102 is performed with about half the power of the incident laser beam, it is desirable that the first recording layer 102 has particularly high sensitivity.
  • the dye used for the first recording layer 102 has a maximum absorption wavelength ⁇ max in the visible light to near infrared region of about 350 to 900 nm, and is suitable for recording with a blue to near microwave laser.
  • a dye compound is preferred.
  • the specific dye used in the first recording layer 102 is not particularly limited, but an organic dye material is usually used.
  • organic dye materials include macrocyclic azanulene dyes (phthalocyanine dyes, naphthalocyanine dyes, porphyrin dyes, etc.), pyromethene dyes, polymethine dyes (such as cyanine dyes, merocyanine dyes, and sillilium dyes), anthraquinone dyes, Examples thereof include azurenium dyes, metal-containing azo dyes, metal-containing indoor phosphorus dyes, and the like. These dyes may be used alone or in combination of two or more in any combination and ratio.
  • the thickness of the first recording layer 102 is not particularly limited because the suitable thickness differs depending on the recording method or the like. However, in order to obtain a sufficient degree of modulation, it is usually 5 nm or more, preferably 10 nm or more, and particularly preferably 20 nm or more. In order to transmit light, it is usually 3 ⁇ m or less, preferably 1 ⁇ m or less, more preferably 200 nm or less.
  • the method for forming the first recording layer 102 is not particularly limited, but generally, vacuum deposition, sputtering, doctor blade method, casting method, spin coating method, dipping method, etc.
  • the thin film formation method currently performed is mentioned.
  • the film forming method is preferably a wet film forming method such as a spin coating method from the viewpoint of mass productivity and cost.
  • the vacuum evaporation method is preferable from the viewpoint that a uniform recording layer can be obtained.
  • the first reflective layer 103 has a light transmittance with a small absorption of recording / reproducing light, usually 40% or more, and an appropriate light reflectance.
  • a layer having an appropriate transmittance by providing a thin metal with high reflectivity can be given.
  • the first reflective layer 103 has a certain degree of corrosion resistance.
  • the first recording layer 102 has a blocking property so that the first recording layer 102 is not affected by the leaching of other components from the upper layer of the first reflective layer 103 (the intermediate layer 104 in the above embodiment).
  • the material constituting the first reflective layer 103 is not particularly limited, but the reflectance at the wavelength of the reproduction light is moderately high, and the material is preferable.
  • the f-rows of the materials constituting the first reflective layer 103 are Au, Al, Ag, Cu, Ti, Cr, Ni, Pt, Ta, Pd, Mg, Se, Hf, V, Nb, Ru, W, Mn, Re, Fe, Co, Rh, Ir, Zn, Cd, Ga, In, Si ⁇ Ge, Te, Pb, Po, Sn, Bi, rare earth metals and other metals and metalloids, alone or in alloys It can be used.
  • the material forming the first reflective layer 103 may be used alone or in combination of two or more in any combination and ratio.
  • the thickness of the first reflective layer 103 is usually 50 nm or less, preferably 30 nm or less, and more preferably 20 nm or less. By setting it within the above range, the light transmittance is reduced to 40% or more. However, the thickness of the first reflective layer 103 is usually 3 nm or more, preferably 5 nm or more, because the first recording layer 102 is not affected by the layer present on the first reflective layer 103.
  • the method of forming the first reflective layer 103 is arbitrary, and examples thereof include a sputtering method, an ion plating method, a chemical vapor deposition method, and a vacuum vapor deposition method.
  • the intermediate layer 104 is transparent and can be formed with concave and convex shapes such as grooves and pits, and is configured to have a resin strength with high adhesive strength with other layers. Furthermore, it is preferable to use a resin having a small shrinkage during curing because the shape stability of the medium is high.
  • intermediate layer 104 may be a single layer as in the first embodiment, as in the second embodiment. Multiple layers may be used.
  • the intermediate layer 104 is usually often compatible with the second recording layer 105. For this reason, it is desirable to provide an appropriate buffer layer between the two layers in order to prevent the intermediate layer 104 and the second recording layer 105 from being incompatible with each other and to prevent damage to the second recording layer 105.
  • the intermediate layer 104 may be provided with a buffer layer between the first reflective layer 103.
  • the intermediate layer 104 be made of a material that does not damage the second recording layer 105.
  • the material constituting the intermediate layer 104 include curable resins such as thermoplastic resins, thermosetting resins, and radiation curable resins.
  • curable resins such as thermoplastic resins, thermosetting resins, and radiation curable resins.
  • the material for the intermediate layer 104 one kind may be used alone, or two kinds or more may be used in any combination and ratio.
  • the materials for the intermediate layer 104 among these, radiation curable resins are preferred, and ultraviolet curable resins are preferred. By adopting these resins, it becomes easy to transfer the uneven shape of the stamper.
  • ultraviolet curable resin examples include radical (radical polymerization type) ultraviolet curable resins and cationic (cation polymerization type) ultraviolet curable resins, both of which can be used.
  • radical ultraviolet curable resin a composition containing an ultraviolet curable compound (radical ultraviolet curable compound) and a photopolymerization initiator as essential components is used.
  • an ultraviolet curable compound for example, monofunctional (meth) acrylate and polyfunctional (meth) acrylate can be used as the polymerizable monomer component. Each of these may be used alone or in combination of two or more in any combination and ratio.
  • attalate and meta acrylate are collectively referred to as (meth) acrylate.
  • the photopolymerization initiator is not limited, but for example, a molecular cleavage type or a hydrogen abstraction type is preferable.
  • an uncured ultraviolet curable resin precursor mainly composed of a radical polymerization type acrylic ester and cure it to obtain an intermediate layer.
  • examples of the cationic ultraviolet curable resin include an epoxy resin containing a cationic polymerization type photoinitiator.
  • examples of the epoxy resin include bisphenol. A-epoxychlorhydrin type, alicyclic epoxy, long chain aliphatic type, brominated epoxy resin, glycidyl ester type, glycidyl ether type, heterocyclic type and the like can be mentioned.
  • the epoxy resin it is preferable to use a resin having a low content of free chlorine and chlorine ions. The amount of chlorine is preferably 1% by weight or less, more preferably 0.5% by weight or less.
  • Examples of the cationic polymerization type photoinitiator include sulfonium salts, odonium salts, diazodium salts, and the like.
  • a radiation curable resin is used as the material of the intermediate layer 104
  • the viscosity is preferably adjusted to 20 to 4000 mPa's.
  • the intermediate layer 104 is provided with a concavo-convex shape spirally or concentrically. This uneven shape forms grooves and lands. Normally, information is recorded and reproduced on the second recording layer 105 using such grooves and / or lands as recording tracks.
  • the method and apparatus for manufacturing an optical recording medium of the present invention has the advantage that the above-described irregular shape that is normally used as a recording track can be satisfactorily formed. Therefore, the intermediate layer 104 with few defects is formed. It is possible to obtain an optical recording medium 100 having the same.
  • the groove width is usually about 100 to 500 nm, and the groove depth is about 10 to 250 nm.
  • the track pitch is preferably about 0.:! To 2. Ozm.
  • the thickness of the intermediate layer 104 is preferably not less than normal, preferably not less than 10 zm, preferably controlled accurately. However, it is usually 100 zm or less, preferably 70 zm or less.
  • the second recording layer 105 has higher sensitivity than the recording layer normally used for optical recording media such as CD-R and single-sided DVD-R.
  • the second recording layer 105 has a low heat generation and a high refractive index in order to achieve good recording / reproduction characteristics.
  • a pigment is desirable.
  • the combination of the second recording layer 105 and the second reflective layer 106 has an appropriate range of light reflection and absorption.
  • the material constituting the second recording layer 105, the film forming method, and the like may be the same as those of the first recording layer 102.
  • the film formation method of the second recording layer 105 is preferably a wet film formation method.
  • first recording layer 102 and the second recording layer 105 may be the same or different.
  • the specific compound used for the second recording layer 105 is not limited, and a compound similar to the first recording layer 103 is preferably used.
  • the guide groove formed in the intermediate layer 104 is deeper than the recording layer in the phase change type optical recording medium described later. Therefore, particularly when the second recording layer 105 is a layer containing an organic dye material, it is difficult to form the second recording layer 105 while maintaining the deep groove shape formed in the intermediate layer 104.
  • the uneven shape formed on the intermediate layer 104 can be reflected well as the unevenness of the recording layer.
  • the thickness of the second recording layer 105 is not particularly limited because the suitable thickness varies depending on the recording method and the like, but is usually 10 nm or more, preferably 30 nm or more, and particularly preferably 50 nm or more. However, in order to obtain an appropriate reflectance, the film thickness of the second recording layer 105 is usually 3 ⁇ m or less, preferably l ⁇ m or less, more preferably 200 nm or less.
  • the second reflective layer 106 has high reflectivity and high durability.
  • the material constituting the second reflective layer 106 is preferably a material having a sufficiently high reflectance at the wavelength of the reproduction light.
  • a material constituting the second reflective layer 106 for example, metals such as Au, Al, Ag, Cu, Ti, Cr, Ni, Pt, Ta, and Pd can be used alone or as an alloy.
  • Au, Al, and Ag are suitable as materials for the second reflective layer 106 having high reflectivity.
  • other components may be included.
  • Examples of other components include Mg, Se, Hf, V, Nb, Ru, W, Mn, Re, Fe, Co, Rh, Ir, Cu, Zn, Cd, Ga, In, Si, Ge, Te, Mention may be made of metals and metalloids such as Pb, Po, Sn, Bi and rare earth metals.
  • the material for forming the second reflective layer 106 is one type. May be used alone Two or more may be used in any combination and ratio.
  • the thickness of the second reflective layer 106 is usually 20 nm or more, preferably 30 nm or more, more preferably 50 nm or more. However, in order to increase the recording sensitivity, it is usually 400 nm or less, preferably 300 nm or less.
  • the method for forming the second reflective layer 106 is not limited, and examples thereof include sputtering, ion plating, chemical vapor deposition, and vacuum vapor deposition.
  • a known inorganic or organic intermediate layer or adhesive layer may be provided above and below the second reflective layer 106 in order to improve the reflectance, the recording characteristics, and the adhesion.
  • the adhesive layer 107 has a high adhesive force and a low shrinkage rate at the time of curing and adhesion because the shape stability of the optical recording medium 100 becomes high.
  • the adhesive layer 107 is preferably made of a material that does not damage the second reflective layer 106.
  • a known inorganic or organic protective layer may be provided between the second reflective layer 106 and the adhesive layer 107 in order to suppress damage.
  • the same material as that of the intermediate layer 104 can be used.
  • the film thickness of the adhesive layer 107 is usually 2 ⁇ m or more, preferably 5 ⁇ or more. However, in order to reduce the thickness of the optical recording medium 100 as much as possible and to suppress the reduction in productivity due to the time required for curing, the film thickness of the adhesive layer 107 is usually lOO xm or less. Is preferred.
  • a pressure-sensitive double-sided tape or the like can be used as the adhesive layer 107.
  • the adhesive layer 107 can be formed by sandwiching and pressing the pressure-sensitive double-sided tape between the second reflective layer 106 and the second substrate 108.
  • the second substrate 108 preferably has high mechanical stability and high rigidity. Also, it is desirable to have high adhesion to the adhesive layer 107.
  • the same material as that used for the first substrate 101 can be used.
  • A1 alloy substrate such as Al_Mg alloy mainly composed of A1
  • Mg alloy substrate such as Mg-Zn alloy mainly composed of Mg, silicon, titanium, ceramics, etc. Or a combination of them You can also.
  • the material of the second substrate 108 may be used alone, or two or more materials may be used in any combination and ratio.
  • the material of the second substrate 108 is preferably polycarbonate from the viewpoints of high productivity such as moldability, cost, low hygroscopicity, and shape stability.
  • the material of the second substrate 108 is preferably amorphous polyolefin from the viewpoint of chemical resistance, low hygroscopicity, and the like.
  • the material of the second substrate 108 is preferably a glass substrate from the viewpoint of high-speed response.
  • an optical recording medium so-called film surface incidence type
  • a curable resin can be arbitrarily used as the material of the second substrate 108. it can.
  • the curable resin examples include a radiation curable resin and a thermosetting resin, and among them, an ultraviolet curable resin which is a kind of the radiation curable resin is preferable.
  • a general-purpose and low-cost resin such as a polycarbonate resin or an acrylic resin can be used in the form of a film.
  • the second substrate 108 is thick to some extent.
  • the thickness of the second substrate 108 is preferably 0.3 mm or more. However, it is 3 mm or less, preferably 1.5 mm or less.
  • the optical recording medium 100 may have any other layer interposed between the above laminated structures as necessary. Alternatively, any other layer may be provided on the outermost surface of the optical recording medium 100. Furthermore, on the optical recording medium 100, printing that can be written (printed) on various surfaces other than the incident surface of recording light or reproducing light by various printers such as ink jet and thermal transfer, or various writing tools, if necessary. A receiving layer may be provided. Further, the two optical recording media 100 may be bonded together with the first substrate 101 facing outside. By laminating two optical recording media 100, a large-capacity medium having four recording layers can be obtained. In addition, when two optical recording media 100 are bonded together as described above, two layers of the adhesive layer 107 and the second substrate 108 are not necessarily required. That is, at least one of the adhesive layer 107 and the second substrate 108 may be a single layer or may not be used.
  • the optical recording medium manufacturing method and manufacturing apparatus of the present invention is a phase change rewritable compact disc (CD-RW, CD- Rewritable) or phase change rewritable DVD. It can also be applied to.
  • a layer structure such as a recording layer when applied to a phase change type optical recording medium, known ones can be used as appropriate.
  • Phase change CD-RW or rewritable DVD uses the difference in reflectance and phase difference caused by the difference in refractive index between the amorphous state and the crystalline state in a recording layer composed of a phase change recording material. The recording information signal is detected.
  • phase change recording material examples include SbTe, GeTe, GeSbTe, InSbTe, AgSbTe, AglnSbTe, GeSb, GeSbSn, InGeSbTe, and InGeSbSnTe materials.
  • a composition containing Sb as a main component in the recording layer.
  • These materials may be used alone or in combination of two or more in any combination and ratio.
  • a recording material as exemplified above may be used.
  • Tg represents the glass transition temperature after curing.
  • a disk-shaped stamper (hereinafter sometimes referred to as a PC stamper) having an outer diameter of 120 mm and a thickness of 0.6 mm having a center hole with an inner diameter of 15 mm was formed by injection molding.
  • a nickel master having a guide groove with a track pitch of 0.74 / im, a width of 0.32 x m, and a depth of 175 nm was used. It was confirmed by an atomic force microscope (AFM) that the guide groove (concave / convex) of the nickel master was accurately transferred to the PC stamper.
  • AFM atomic force microscope
  • a tetrafluoropentanol solution (concentration 2% by weight) of a metal-containing azo dye was prepared, and this was dropped on a substrate and applied by a spinner method. After coating, the film was dried at 70 ° C. for 30 minutes to form a first recording layer. Further, on the first recording layer, a 17 nm thick translucent first reflective layer was formed by sputtering using an Ag alloy having an Ag_Bi (Bi: 1.0 atomic%) force.
  • a predetermined ultraviolet curable resin [1] for forming the first resin layer is dropped on the first reflective layer in a circular shape, and a film (first 1 Resin layer) was formed.
  • a predetermined ultraviolet curable resin [2] for forming the second resin layer is dropped in a circle on the surface of the PC stamper where the guide groove is formed, and the thickness is increased by a spinner method.
  • the first substrate and the PC stamper were bonded so that the first resin layer and the second resin layer face each other. Subsequently, ultraviolet rays were irradiated from the PC stamper side to cure and bond the first resin layer and the second resin layer to form an adhesive body.
  • UV curable resins were used as the UV curable resins [1] and [2], respectively. Details are as follows. Table 1 shows the glass transition temperatures after curing of the polycarbonate used for the PC stamper and the UV curable resin [2] that forms the outermost resin layer.
  • the adhesive body was held in a thermostat (oven) heated to 100 ° C for a predetermined time (the holding time was changed in Examples and Comparative Examples).
  • Table 1 shows the time kept in the thermostat and the surface temperature of the bonded body measured immediately before the PC stamper was peeled off.
  • the PC stamper and the second resin layer (outermost resin layer) were peeled as follows. That is, after inserting a knife edge into the outer periphery of the bonded body, the PC stamper was peeled off from the second resin layer (outermost resin layer) by applying force.
  • the surface of the PC stamper after peeling was subjected to visual inspection under a fluorescent lamp or optical microscope observation, and the peelability was evaluated according to the following criteria.
  • a tetrafluoropentanol solution (concentration 2% by weight) of a metal-containing azo dye was dropped and applied by a spinner method. After coating, the film was dried at 70 ° C. for 30 minutes to form a second recording layer.
  • a second reflective layer having a thickness of 120 nm was formed by a sputtering method using an Ag alloy having an Ag_Bi (Bi: 1.0 atomic%) force. Further, an adhesive layer was provided on the second reflective layer by spin coating an ultraviolet curable resin. A polycarbonate substrate having a diameter of 120 mm and a thickness of 0.6 mm was placed on the adhesive layer to form a second substrate, which was cured and adhered by irradiation with ultraviolet rays.
  • the Push-Pull signal obtained from the second recording layer of the optical recording medium having two recording layers prepared in advance was measured.
  • the push-pull signal is defined by the following formula.
  • (I -I) is the amplitude between the vertices of the (I -I) signal.
  • (I +1) is the (I +1) signal
  • the focus servo was applied to the second recording layer, the tracking servo was in an open loop state, and the optical recording medium was rotated at 3.8 m / s. Normally, since an optical disk has an eccentricity of several tens of microns, the reproduction beam crosses the guide groove and the land several tens of times in one rotation.
  • the (I I) and (I +1) signals do not indicate sinusoidal output.
  • Push-pull signals were measured at three locations on the optical recording medium (radial position: 25 mm, 40 mm, and 55 mm). Table 1 shows the push-pull signal measurement results for the optical recording media of each example and each comparative example.
  • Table 1 shows the PI error measurement results for the optical recording media of each Example and each Comparative Example.
  • Comparative Examples 1 and 2 since the peelability was poor, scratches (residues) that could be visually confirmed were observed on the PC stamper after peeling. This suggests that there may be defects such as fine scratches on the surface of the intermediate layer.
  • the optical recording media of Comparative Examples 1 and 2 had good push-pull signals and PI errors at the radial positions of 25 mm, 40 mm, and 55 mm. May interrupt the recording.
  • Example 3 In addition to using the ultraviolet curable resin [2] as the second resin layer, the same method as in Example 3 was used except that the following ultraviolet curable resins [3] to [5] were used, respectively.
  • An optical recording medium was manufactured, and the push-pull signal, PI error, and peelability were measured in the same manner as in Example 3. As a result, each case was as good as in Example 3. The result is
  • the ultraviolet curable resin [1] was dropped in a circle, and a film (first resin layer) having a thickness of about 25 ⁇ m was formed by a spinner method.
  • the UV curable resin [2] is dropped in a circle on the surface of the PC stamper where the guide groove is formed, and a film (second resin layer) about 25 ⁇ m thick is formed by the spinner method. did.
  • the first substrate and the PC stamper were bonded so that the first resin layer and the second resin layer face each other. Subsequently, ultraviolet rays were irradiated from the PC stamper side to cure and bond the first resin layer and the second resin layer to form an adhesive for basic experiments.
  • the PC stamper was peeled off at room temperature (25 ° C.).
  • the PC stamper and the second resin layer (outermost resin layer) were peeled as follows. In other words, for the above basic experiment After inserting a knife edge into the outer periphery of the adhesive body, the PC stamper was peeled off from the second resin layer (outermost resin layer) with increased force.
  • the peelability was the same level as in Comparative Example 1 (evaluation criteria: X). Further, the surface of the PC stamper after peeling and the surface of the intermediate layer were visually and microscopically observed. As a result, it was confirmed that there were scratches on the surface of the stamper, and there were also scratches on the surface of the intermediate layer.
  • the present invention can be widely used in any field that is applied to an optical recording medium, and is particularly suitable for production of an optical recording medium having an intermediate layer having a concavo-convex shape. Specific examples are particularly suitable for use in CDs, DVDs, blue laser compatible optical recording media, and the like.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacturing Optical Record Carriers (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

La présente invention concerne un procédé et un appareil permettant de produire à faible coût un support d'enregistrement optique qui comprend une couche intermédiaire possédant une bonne surface ondulée et uniquement quelques défauts. Plus spécifiquement, une couche d'enregistrement est formée directement sur un substrat ou via une autre couche, et une couche de résine est formée directement sur la couche d'enregistrement ou via une autre couche. Puis une matrice de pressage qui présente un motif ondulé à former est placée sur la couche de résine et, un corps collé est obtenu par durcissement de cette couche de résine. Ensuite, la matrice de pressage est séparée de la couche de résine alors que le corps collé est chauffé, formant ainsi la couche de résine en une couche intermédiaire possédant un motif ondulé transféré.
PCT/JP2006/322988 2005-11-18 2006-11-17 Procede et appareil de production de support d'enregistrement optique WO2007058309A2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN2006800413525A CN101300632B (zh) 2005-11-18 2006-11-17 光记录介质的制造方法和制造装置
HK08113936.2A HK1122894A1 (en) 2005-11-18 2008-12-24 Method and apparatus for producing optical recording medium

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JP2005334434 2005-11-18

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HK (1) HK1122894A1 (fr)
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Cited By (1)

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JP2009245508A (ja) * 2008-03-31 2009-10-22 Taiyo Yuden Co Ltd 光情報記録媒体

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JP5705049B2 (ja) * 2011-07-13 2015-04-22 富士フイルム株式会社 多層構造シートとその製造方法、光情報記録媒体および多層構造シートを用いた光情報記録媒体の製造方法
CN112562488A (zh) * 2020-12-12 2021-03-26 武汉华工图像技术开发有限公司 一种动态光变防伪元件及制备方法

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JP2004288259A (ja) * 2003-03-20 2004-10-14 Mitsubishi Chemicals Corp 光記録媒体、光記録媒体の膜厚測定方法、膜厚制御方法及び製造方法
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JP3580280B2 (ja) * 2001-10-25 2004-10-20 株式会社日立製作所 記録媒体とその製造方法
JP2004039136A (ja) * 2002-07-04 2004-02-05 Pioneer Electronic Corp 光学多層記録媒体成形用透明スタンパおよび光学多層記録媒体の製造方法

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JP2003203402A (ja) * 2001-12-28 2003-07-18 Matsushita Electric Ind Co Ltd 光情報記録媒体の製造方法、および光情報記録媒体
JP2004288259A (ja) * 2003-03-20 2004-10-14 Mitsubishi Chemicals Corp 光記録媒体、光記録媒体の膜厚測定方法、膜厚制御方法及び製造方法
WO2005088629A1 (fr) * 2004-03-15 2005-09-22 Matsushita Electric Industrial Co., Ltd. Support d'enregistrement d'informations multicouche et procede servant a produire celui-ci

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009245508A (ja) * 2008-03-31 2009-10-22 Taiyo Yuden Co Ltd 光情報記録媒体
WO2009123353A3 (fr) * 2008-03-31 2009-11-26 太陽誘電株式会社 Support d'enregistrement d'informations optiques et son procédé de fabrication
US8394480B2 (en) 2008-03-31 2013-03-12 Taiyo Yuden Co., Ltd. Optical information recording medium and manufacturing method therefor

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TW200802360A (en) 2008-01-01
CN101300632A (zh) 2008-11-05
HK1122894A1 (en) 2009-05-29
CN101300632B (zh) 2011-05-18
TWI395218B (zh) 2013-05-01
WO2007058309A3 (fr) 2007-08-02

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