WO2006109722A1 - 光記録媒体 - Google Patents
光記録媒体 Download PDFInfo
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- WO2006109722A1 WO2006109722A1 PCT/JP2006/307448 JP2006307448W WO2006109722A1 WO 2006109722 A1 WO2006109722 A1 WO 2006109722A1 JP 2006307448 W JP2006307448 W JP 2006307448W WO 2006109722 A1 WO2006109722 A1 WO 2006109722A1
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Definitions
- the present invention relates to an optical recording medium, and more particularly to an optical recording medium capable of obtaining good recording / reproduction characteristics at high speed recording.
- optical recording media such as DVD-RW and DVD-R store large amounts of information and are easily accessible at random. Therefore, as an external storage device in an information processing apparatus such as a computer.
- a typical DVD-R having an organic dye-containing recording layer has a dye recording layer and a reflective layer in this order on a transparent disk substrate, and a laminate having a protective layer covering these recording layers and the reflective layer.
- the structure is such that recording and playback are performed with laser light through the substrate.
- a multilayer optical recording medium in which a plurality of recording layers are provided on the same medium has been developed.
- the first transparent disk-shaped recording medium has been developed.
- a two-layer type optical recording medium having two dye recording layers on an intermediate layer made of an ultraviolet curable resin on a substrate has been reported.
- Such a two-layer optical recording medium has a 2P (Photo Polymerization) method using a transparent stamper and two disk substrates on which a recording layer and a reflective layer are laminated, and a photo-curable resin layer is interposed therebetween. And a method of attaching them.
- a recording layer containing a reflective layer and a dye hereinafter also referred to as a recording layer (1) or a second recording layer
- a recording layer (1) or a second recording layer is formed on the substrate that is the deepest in the laser light incident surface. They are layered in order of power.
- the recording layer and the reflective layer are laminated in this order on the substrate on which the recording track guide groove is formed (
- a laminated body or laminated structure may be referred to as a “regular laminated body” or a “regular laminated structure” when the transparent resin layer in which the grooves are formed is viewed on the substrate.)
- a reflective layer and a recording layer are laminated in this order on a substrate similar to the above (hereinafter, such a laminated body or laminated structure may be referred to as “reverse laminated body” or “reverse laminated structure”).
- Manufacture is performed by combining the coated surfaces and curing the photocurable resin. Optical information is recorded and reproduced on the two recording layers using recording / reproducing light incident from the first disk substrate side.
- Such a method of adhering two disc substrates does not require a step of transferring the uneven shape of the transparent stamp as in the 2P method, and is considered to be excellent in productivity and cost reduction.
- Patent Document 1 JP 2000-311384 A (paragraphs [0052], [0053], Example 2)
- Patent Document 2 JP 2002-373451 A (paragraphs [0034], [0035], implementation) Example) Disclosure of the invention
- the pressure is reduced.
- the recording area is formed, for example, by changing the periphery of the recording layer exposed to a high temperature.
- the thermal diffusion, particularly the heat radiation in the in-plane direction of the recording layer is unlikely to occur, the recording portion tends to expand to the adjacent track portion, and the cross talk tends to increase when recording is performed on a plurality of tracks. . These tendencies may cause the phenomenon that it is difficult to obtain good jitter.
- Such crosstalk may be observed in the two-layer type optical recording medium by the above-described 2P method.
- the two-layer formed by the method of adhering two disk substrates Type In a recording medium, it is prominently observed in a recording layer located behind the incident surface of recording / reproducing light (hereinafter sometimes referred to as “second recording layer”).
- the second recording layer of the two-layer optical recording medium formed by the method of adhering two disc substrates is an inverse laminate in which a reflective layer and a recording layer are laminated on a substrate. Is provided.
- the second disk substrate provided on the back side from the recording / reproducing light incidence surface in the two-layer type optical recording medium has a guide groove depth to ensure the reflectivity of the recording / reproducing light. It is set shallower than before. For this reason, the physical barrier effect of the guide groove is reduced, and excessive deformation due to flow deformation of the resin on the substrate occurs during recording and crosstalk is likely to increase immediately.
- the present invention has been made to solve such a problem.
- an object of the present invention is to provide an optical recording medium including an inversely laminated structure capable of obtaining good recording / reproducing characteristics in high-speed recording applications.
- another object of the present invention is to provide an optical recording medium having a second recording layer that is particularly excellent in high-speed recording in a two-layer optical recording medium.
- the present inventors have formed a barrier layer provided between the recording layer and the transparent resin layer with a material having a high thermal conductivity as a butter and a very thin film thickness. As a result, the present inventors have found that the above problems can be effectively solved.
- the second recording layer of the two-layer optical recording medium contains a specific dye that is particularly excellent for high-speed recording, thereby solving various problems required for the second recording layer.
- the present inventors have found that sufficient light resistance can be maintained, and have reached the present invention.
- the gist of the present invention is an optical recording medium having a reflective layer, a recording layer containing a dye, and a transparent resin layer in this order on a substrate, wherein the recording layer and the resin layer are A barrier layer in between
- the thermal conductivity M at 300K as a barrier of the material used for the barrier layer is 7 OW / m'K or more
- the thickness t of the barrier layer is smaller than 5 nm.
- a first reflective layer, a first recording layer containing a dye, a transparent resin layer, a second reflective layer containing a dye, and a second recording are formed on a first substrate.
- R 1 is a hydrogen atom or an ester group represented by CO R 3 (where R 3 is a straight chain or a
- R 2 represents a linear or branched alkyl group.
- At least one of X 1 and X 2 is NHSO Y group (where Y is at least two
- R 4 and R 5 each independently represents a hydrogen atom, a linear or branched alkyl group, or a linear or branched alkoxy group.
- R 6 , R 7 , R 8 and R 9 each independently represent a hydrogen atom or an alkyl group having 1 or 2 carbon atoms. It should be noted that H + is eliminated from the NHSO Y group to become NS ⁇ Y_ (negative) group, and the above general formula (1
- the azo compound represented by) forms a coordinate bond with a metal ion.
- the transparent resin layer has an intermediate layer having a guide groove in a two-layer optical recording medium in which a guide groove is formed in the intermediate layer by the two-sided method. (This may be referred to as “two-layered” hereinafter).
- an optical recording medium capable of obtaining good recording / reproducing characteristics in high-density, high-speed recording applications can be obtained.
- FIG. 1 (a) is a cross-sectional view schematically showing a configuration of an optical recording medium according to the first embodiment of the present invention
- FIG. 1 (b) is a diagram of the present invention
- FIG. 5 is a cross-sectional view schematically showing a configuration of an optical recording medium according to a second embodiment.
- FIG. 2 is a graph showing the relationship between ⁇ jitter and the thermal conductivity of the barrier layer material in the reverse laminate of the optical recording medium manufactured in Experimental Example 1.
- FIG. 3 is a graph showing the relationship between the thickness of the barrier layer and the jitter in the reverse laminated body of the optical recording medium produced in Experimental Example 2.
- FIG. 4 is a graph showing the relationship between the material of the barrier layer and ST (%) and MT (%) in the reverse laminated body of the optical recording medium manufactured in Experimental Example 1.
- FIG. 5 is a cross-sectional view schematically showing a configuration of an optical recording medium according to a third embodiment of the present invention.
- Fig. 6 is a graph showing the relationship between jitter and asymmetry in the reverse laminate of the optical recording medium produced in Experimental Example 4, and Fig. 6 (b) is the graph in Experimental Example 4. 3 is a graph showing the relationship between jitter and recording power in a reverse laminated body of the produced optical recording medium.
- FIG. 7 is a graph showing the relationship between jitter and asymmetry in the recording layer (1) of the optical recording medium produced in Experimental Example 5.
- the present invention is not limited to the following embodiments, and can be implemented with various modifications within the scope of the gist thereof.
- the first optical recording medium of the present invention has, as its basic structure, a reflective layer, a recording layer containing a dye, and a transparent resin layer in this order on a substrate. Furthermore, a barrier layer is provided between the recording layer and the resin layer as necessary.
- One feature of the present invention is that a material having a high thermal conductivity is used for the rear layer.
- a material with high thermal conductivity for the barrier layer in this way, heat during recording of the recording layer of the reverse laminate can be dissipated to suppress excessive deformation during recording and reduce crosstalk. Is possible.
- the present invention has another feature in that the thickness of the barrier layer is made thinner than 5 nm. By reducing the film thickness in this way, even if a metal film or alloy film with a large extinction coefficient is used as a barrier layer, it is possible to suppress the attenuation of the recording light and to reduce the recording sensitivity of the reverse laminated structure. It becomes possible to obtain characteristics. Further, as will be described later, it is considered possible to form a good recording edge portion.
- the effect of reducing crosstalk in the present invention is that the groove shape of the substrate used in the reverse laminated body, in particular, the groove depth is set to about 1Z5 or less of the groove depth of the normal forward lamination or the second disk substrate. This is especially noticeable in some cases. In other words, the effect of the present invention is remarkably exhibited when the grooves of the substrate of the reverse laminated body are provided shallowly in order to secure the disk reflectivity and suppress the decrease in recording sensitivity.
- the present invention is preferably applied to a reverse laminated body using a substrate having a shallower groove than the conventional one.
- FIG. 2 The relationship between the thermal conductivity of the barrier layer and the recording characteristics is supported by FIG. 2 in [Experimental Example 1] described later.
- the jitter when recording on a plurality of tracks and reproducing the signals recorded on both adjacent tracks is referred to as MT (%).
- the jitter that can be reproduced by recording the portion recorded on only one track in the state where there is no recording in the track that contacts P is referred to as ST (%).
- ST (%) includes the effects of crosstalk
- ST (%) does not include the effects of crosstalk.
- Ajitter is a difference value between the MT (%) and the ST (%), and the larger the value, the greater the crosstalk.
- the ⁇ jitter value is preferably 2% or less. When Ajitter exceeds 2%, MT (%) is 9 even if ST (%) is 7% and good. This is because the value exceeds / 0 , which is not preferable.
- the thermal conductivity is less than 2% at 70 W / m'K or more, and good characteristics can be obtained.
- the film thickness of the barrier layer is high heat transfer as supported by Table 3 of [Experimental Example 2] described later.
- Table 3 of [Experimental Example 2] described later In the barrier layer of conductivity, it can be seen that it is difficult to improve jitter at the boundary of 5 nm. This is considered to be one of the causes that the recording light intensity is attenuated and the recording sensitivity is deteriorated as the film thickness is increased. It is also possible that the change in film morphology due to the increase in film thickness is related to deterioration.
- the morphology of this film can be adjusted to some extent by the film formation conditions of the sputtering, the film composition, and the like.
- the second reflective layer and the second recording layer are disposed on the opposite side of the transparent resin layer in contact with the reverse laminate from the reverse laminate side.
- FIG. 1 (a) is a cross-sectional view schematically showing a configuration of an optical recording medium according to the first embodiment of the present invention.
- Fig. 1 (a) shows a disk substrate (reverse laminate 11) in which a reflective layer and a recording layer are laminated on a transparent substrate, and a disk substrate (forward laminate 12) in which a recording layer and a reflective layer are sequentially laminated on a transparent substrate. ) Is shown.
- an optical recording medium 100 includes a disc-shaped light-transmitting substrate (1) 101 in which grooves and lands or prepits are formed as an inverse laminate 11, and this
- the substrate (1) 101 includes a reflection layer (1) 102 provided on the incident surface side of the laser beam 110, a recording layer (1) 103 containing a dye, and a barrier layer 104.
- a disk-shaped light-transmitting substrate (2) 109 having grooves and lands or prepits, and a recording layer (2) 108 containing a dye provided on the substrate (2) 109
- a translucent reflective layer (2) 107 that distributes the portion of the laser beam 110 incident from the substrate (2) 109 side, and a protective coating layer 106 provided on the reflective layer (2) 107.
- the reverse laminate 11 and the regular laminate 12 are laminated via the transparent resin layer 105 so that the NOR layer 104 and the protective coat layer 106 face each other, and a two-layer type optical recording medium 100 is obtained. Is configured.
- optical information is recorded and reproduced by the laser beam 110 incident from the substrate (2) 109 side of the positive laminate 12.
- the reverse laminated body 11 includes the substrate (1) 101, the reflective layer (1) 102, the recording layer (1) 103, and the barrier laminated on the substrate (1) 101.
- the layer 104 (hereinafter, the reflection layer (1) 102, the recording layer (1) 103, and the barrier layer 104 may be collectively referred to as “L1 layer”).
- the material constituting the substrate (1) 101 is desirably optically transparent and has excellent optical properties such as a low birefringence. In addition, it is desirable to have excellent moldability such as easy injection molding. Furthermore, it is desirable that the hygroscopicity is small. Furthermore, it is desirable to provide shape stability so that the optical recording medium 100 has a certain degree of rigidity.
- a material is not particularly limited. For example, acrylic resin, methacrylic resin, polycarbonate resin, polyolefin resin (especially amorphous polyolefin), polyester resin, polystyrene resin, epoxy resin, glass Etc.
- substrates such as glass
- polycarbonate is preferable from the viewpoints of high productivity such as optical characteristics and moldability, cost, low hygroscopicity, and shape stability.
- Amorphous polyolefin is preferred from the standpoint of chemical resistance and low hygroscopicity.
- a glass substrate is preferable from the viewpoint of high-speed response.
- a backing made of an appropriate material can be provided in order to increase mechanical stability and increase rigidity.
- A1 alloy substrates such as Al—Mg alloys containing A1 as the main component
- Mg alloy substrates such as Mg_Zn alloys containing Mg as the main component
- substrates such as silicon, titanium, ceramics, and paper; These combinations are mentioned.
- the groove depth of the guide groove portion of the substrate (1) 101 constituting the reverse laminate 11 is usually 1/100 or more, preferably ⁇ 2/100 or more, and ⁇ , where ⁇ is the recording / reproducing wavelength. Preferably ⁇ or 2. ⁇ / ⁇ 00 or more.
- the groove depth of the substrate (1) 101 is usually 6.6 nm or more, preferably 13 nm or more, more preferably 14.5 nm or more. is there.
- the upper limit of the groove depth of the substrate (1) 101 in the reverse laminate 11 is preferably set to lOnm or less.
- the amount of laser light 110 and the amount of reflected light incident on the recording layer (1) 103 via the substrate (2) 109 and the transparent resin layer 105 are as follows. ) Decreased by 108 and reflective layer (2) 107, resulting in low reflectivity 7 ⁇ 00 or less is a preferable upper limit of the groove depth.
- the groove depth of the substrate (1) 101 is preferably 46.2 nm or less. More preferably, it is 6/100 or less.
- the groove depth of the substrate (1) in the reverse laminated body 11 be shallower than the groove depth of the substrate (2) in the structure of the positive laminated body 12 described later.
- the ratio to the groove depth of the substrate (2) is usually 1/3 or less, preferably 1/4 or less, more preferably 1/5 or less.
- the groove width of the substrate (1) 101 in the reverse laminated body 11 is usually T / 10 or more, preferably 2T / 10 or more, and more preferably 3T / 10 or more, with the track pitch being taken into account. However, it is usually 8% / 10 or less, preferably 7T / 10 or less, more preferably 6T / 10 or less. If the groove width of the substrate (1) 101 is within this range, tracking can be performed satisfactorily and sufficient reflectance can be obtained. For example, when the track pitch is 740 nm, the groove width of the substrate (1) 101 is usually 74 nm or more, preferably 148 nm or more, and more preferably 222 nm or more.
- the upper limit of the substrate (1) 101 is usually 592 nm or less, more preferably 518 nm or less, and still more preferably 444 nm or less.
- the “groove width” of the substrate refers to the width of the groove at half the maximum depth of the groove, that is, the half-value width.
- the substrate (1) 101 is preferably thick to some extent.
- the thickness of the substrate (1) 101 is usually preferably 0.3 mm or more. However, it is usually 3 mm or less, preferably 1.5 mm or less.
- the material constituting the reflective layer (1) 102 of the reverse laminate 11 is not particularly limited.
- any one of metalloids can be used alone, or any two or more can be used as alloys.
- Au, Al, and Ag are preferable.
- a metal material containing 50% or more of Ag is preferable because of its low cost and high reflectance.
- the reflective layer (1) 102 contains at least one element selected from the group consisting of Ti, Zn, Cu, Pd, Au, and rare earth metals as a main component of 0.1 to 15:
- An alloy containing atomic% is preferable.
- Two or more elements of Ti, Bi, Zn, Cu, Pd, Au and rare earth metals When it is included, the respective contents may be 0.:! To 15 atomic%, but the total content thereof is preferably 0.:! To 15 atomic%.
- the alloy composition of the reflective layer (1) 102 is composed of Ag as a main component and at least one element selected from the group consisting of Ti, Bi, Zn, Cu, Pd, and Au. ⁇ 15 atomic%, and if necessary, at least one kind of rare earth element is contained at 0.1 ⁇ : 15 atomic%.
- rare earth metals neodymium is particularly preferred.
- the composition ratio of the alloy used in the present embodiment is in the above range.
- the reflective layer (1) 102 a layer composed only of Au is suitable because it has small crystal grains and excellent corrosion resistance. It is also possible to use a layer made of Si as the reflective layer (1) 102. Furthermore, a multilayer film can be formed by alternately stacking a low refractive index thin film and a high refractive index thin film using a material other than a metal, and can be used as a reflective layer.
- Examples of the method for forming the reflective layer (1) 102 include a sputtering method, an ion plating method, a chemical vapor deposition method, and a vacuum vapor deposition method.
- the reflective layer (1) 102 in the reverse laminate 11 preferably has high reflectivity and high durability.
- the thickness of the reflective layer (1) 102 is usually 30 nm or more, preferably 40 nm or more, and more preferably 50 nm or more.
- it is usually 400 nm or less, preferably 300 nm or less.
- the recording layer (1) 103 in the reverse laminate 11 usually contains a dye having the same sensitivity as that of a recording layer used for a single-sided recording medium such as CD_R, DVD-R, DV D + R, and the like.
- a dye is preferably a dye compound having a maximum absorption wavelength max in a visible light to near infrared region of about 350 to 900 nm and suitable for recording with a blue to near microwave laser.
- a near-infrared laser with a wavelength of approximately 770 to 830 nm (for example, ⁇ MA, 780 nm, 830 nm), which is usually used for CD-R, and a red laser with a wavelength of approximately 620 to 690 nm for DVD_Ri use
- a dye suitable for recording with a so-called blue laser or the like having a wavelength of 635, 660, or 680 mm and a wavelength of 405 or 515 is more preferable. It is also possible to use a phase change material.
- the dye used in the recording layer (1) 103 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 (cyanine dyes, merocyanine dyes, squalium dyes, etc.), anthraquinone dyes. And azurenium dyes, metal-containing azo dyes, metal-containing indoor phosphorus dyes, and the like. Of these, metal-containing azo dyes are preferable because they are excellent in recording sensitivity, durability and light resistance. These dyes may be used alone or in combination of two or more.
- the recording layer (1) 103 may contain other components in addition to the dye.
- the recording layer (1) 103 has a transition metal chelate compound (for example, acetyl acetyltonate chelate, bisphenyl dithiol, etc.) as a singlet oxygen quencher to improve the stability and light resistance of the recording layer.
- a transition metal chelate compound for example, acetyl acetyltonate chelate, bisphenyl dithiol, etc.
- a recording sensitivity improver such as a metal compound for improving the recording sensitivity.
- a metal compound refers to a compound in which a metal such as a transition metal is contained in the form of atoms, ions, clusters, etc., for example, ethylenediamine complex, azomethine complex, phenylhydroxyamine complex.
- Phenanthrin complex dihydroxyazobenzene complex, dioxime complex, nitrosaminophenol complex, pyridyltriazine complex, acetylacetate complex, metaguchisen complex, vorphiline complex And organometallic compounds.
- a metal atom It is preferable that it is a transition metal.
- the recording layer (1) 103 can be used in combination with a binder, a leveling agent, an antifoaming agent, or the like, if necessary.
- binders include polybutyl alcohol, polyvinyl pyrrolidone, nitrocellulose, cellulose acetate, ketone resin, acrylic resin, polystyrene resin, urethane resin, polybutyral, polycarbonate, polyolefin and the like.
- the method for forming the recording layer (1) 103 is not particularly limited, but is usually a vacuum deposition method, a sputtering method, or the like. Commonly used thin film formation methods such as the notching method, doctor blade method, cast method, spin coating method, and dipping method are listed, but in terms of mass productivity and cost, a wet film formation method such as a spin coating method is used. preferable. In addition, vacuum vapor deposition is preferred from the viewpoint that a uniform recording layer can be obtained.
- the rotation speed is preferably 10 to 15000 rpm.
- heat treatment is generally performed to remove the solvent.
- the coating solvent for forming the recording layer by a coating method such as a doctor blade method, a casting method, a spin coating method, or a dipping method is not particularly limited as long as it does not attack the substrate.
- ketone alcohol solvents such as diacetone alcohol and 3-hydroxyl-3-methyl-2-butanone
- cellosolv solvents such as methylcetosolve and ethylcetosolve
- chain hydrocarbons such as n-hexane and n-octane
- Solvents Cyclohexane, methylcyclohexane, ethylcyclohexane, dimethylcyclohexane, n-butylcyclohexane, tert-butylcyclohexane, cyclooctane and other cyclic hydrocarbon solvents
- tetrafluoropropanol octafluoro Perfluoroalkyl alcohol solvents such as chloropentanol and hexafluorobutanol
- hydroxycarboxylic acid ester solvents such as methyl lactate, ethyl lactate and methyl 2-hydroxyisobutyrate.
- the heat treatment for removing these solvents is usually performed at a temperature slightly lower than the boiling point of the solvent to be used, from the viewpoint of removing the solvent and using a simple facility. It is performed in the range of ° C to 100 ° C. Further, the heat treatment method is not particularly limited. For example, after forming a film by applying a solution containing a dye on the substrate (1) 101 to form the recording layer (1) 103, a predetermined film is formed. Examples of the method include holding at a temperature for a predetermined time (usually 5 minutes or more, preferably 10 minutes or more, and usually within 30 minutes, preferably within 20 minutes). Further, a method of heating the substrate (1) 101 by irradiating infrared rays or far infrared rays for a short time (for example, 5 seconds to 5 minutes) is also possible.
- the vacuum deposition method for example, an organic dye and, if necessary, recording layer components such as various additives are placed in a crucible installed in the vacuum vessel, and the inside of the vacuum vessel is filled with an appropriate vacuum pump. After exhausting to about 10 2 to 10 _5 Pa, the crucible is heated to evaporate the components of the recording layer, and is deposited on a substrate placed facing the crucible.
- the thickness of the recording layer (1) 103 of the reverse laminate 11 is usually 40 nm or more, preferably 50 nm or more, provided that it is usually 150 nm or less, preferably lOOnm or less. When the thickness force S of the recording layer (1) 103 is within this range, it is possible to suppress a decrease in sensitivity while ensuring a sufficient recording signal amplitude. In addition, if the recording layer (1) 103 is excessively thick, the sensitivity may decrease.
- the noria layer 104 is provided in the reverse laminate 11.
- the barrier layer 104 is provided between the recording layer (1) 103 and the transparent resin layer 105 in order to prevent components that ooze from the transparent resin layer 105 from contaminating or dissolving the recording layer (1) 103. Provided.
- the barrier layer 104 is used to secure heat dissipation in the recording layer 103 and suppress crosstalk in high-speed recording. For this reason, in the present invention, a very thin film is formed by using a material having a high thermal conductivity as a butter which is not a thick film conventionally known for alloys and dielectrics. The characteristic is obtained.
- the thermal conductivity of Balta increases rapidly with 70W / m'K as the boundary.
- Fig. 2 which summarizes some of the data of the examples described later, if the thermal conductivity is further 9 OW / m'K or more, ⁇ jitter is 1%, except for Si and C, which are semiconductors. It can be seen that very good characteristics can be obtained.
- the upper limit of the thermal conductivity of the barrier layer 104 is not necessarily limited, but 700 WZm′K is considered to be sufficient.
- a single semiconductor such as Si or C is considered to exhibit even better characteristics by increasing its conductivity by alloying or using additives.
- the thickness of the barrier layer 104 is usually less than 5 nm, preferably 4 nm or less, more preferably 3.5 nm or less.
- the lower limit value of the film thickness is usually 0.5 nm or more, more preferably 1 nm or more, and further preferably 1.5 nm or more.
- a thin film made of a material having high ductility and malleability and having a high thermal conductivity is used for the barrier layer 104. It is possible to trace the change due to the decomposition of the dye in the recording layer, and the jitter can be further improved.
- Materials of the barrier layer 104 of the present invention include Mg, Cr, Mn, Fe, Ni, Zn, Ru, Rh, Pd, In, Os, Ir, Pt, Mo, Al, W, Co, Cr, Cu, Ag, Au alone or an alloy is preferable. More preferably, a simple substance or an alloy of Cu, Al, Au, Co, Cr, Mo, Si, W, C, and Ag is used. More preferably, it is a single element of a metal element or an alloy containing these metal elements as a main component in which Mo, W, Cu, Co, Cr, and A are selected. A metal element force S “main component” means that the metal element occupies 50% by weight or more of the alloy composition.
- Mo, W, and Cu have extremely good characteristics
- Co and Cr both have good sensitivity and good jitter at 4 ⁇ speed recording and 8 ⁇ speed recording.
- Ag, Al, Si, and C may become a barrier layer 104 with good recording characteristics and weather resistance by alloying or improvement of a photo-curing resin.
- the barrier layer 104 is considered to be better if it is a dense and smooth film. This is because when there is a density in the film, such as island-like structures, a change in temperature and humidity such as in a high-temperature and high-humidity test may cause grain boundaries to increase and the particle size to increase, resulting in an increase in noise. This is because an increase in film defects can occur.
- the dense and smooth structure of the barrier layer 104 depends not only on its constituent components and composition but also on the conditions for forming the barrier layer 104.
- the node layer 104 is formed by a generally used film forming method such as a vacuum evaporation method or a sputtering method, but it is preferable to form the node layer 104 by a notch method.
- a target is pre-sputtered before sputtering. Set the pre-sputtering time longer than usual and start the sputtering after removing the moisture adsorbed on the target and the surface oxide layer, or set the argon pressure as low as possible.
- the barrier layer 104 of the present invention is a thin film, it is considered that the surface state of the film of the NORA layer 104 affects the recording. Therefore, the recording characteristics can be improved by obtaining a dense and smooth film structure.
- thermal conductivity refers to 300K described in Kittel, “Introduction to Solid State Physics, Volume 1", 6th edition, Table 1, "Debye temperature and thermal conductivity” on page 117. The value of thermal conductivity at is used. Table 1 below shows the thermal conductivity values of the main materials listed in the above table.
- the barrier layer 104 is composed of a plurality of compositions, such as in the case of an alloy, it is obtained from the value obtained by multiplying the thermal conductivity of the Balta of each composition by the ratio of the composition as follows.
- the value of the thermal conductivity is determined as the thermal conductivity of the material used for the barrier layer 104 .
- a layer made of the same material as the barrier layer 104 may be provided between each of the layers.
- the transparent resin layer 105 in the two-layer optical recording medium 100 of the present embodiment usually has a light transmittance that allows the laser light 110 incident from the substrate (2) 109 side to reach the recording layer (1) 103. Consists of materials.
- the transparent resin layer 105 is preferably composed of a transparent resin having a glass transition temperature Tg of 150 ° C. or higher.
- the transparent resin layer 105 may be composed of one layer or multiple layers. Constructing a transparent resin layer using such a transparent resin is thought to increase the hardness of the transparent resin layer and improve jitter.
- the resin constituting the transparent resin layer 105 has an elastic modulus at 30 ° C of usually lOOOMPa or more, preferably ⁇ 2000MPa or more, more preferably ⁇ or 3000MPa or more, and further preferably ⁇ or 4000MPa or more. Is desirable.
- the transparent resin layer 105 using a resin having an elastic modulus of lOOOMPa or more, the so-called confinement effect is further enhanced in recording and reproduction of the L1 layer (FIG. 1).
- the upper limit of the elastic modulus is usually 6000 MPa or less.
- the transparent resin layer 105 can be formed by a solution method such as coating, which is industrially advantageous. Construct transparent resin layer 105 When the resin has an elastic modulus in the above range, in the recording of the optical information of the recording layer (1) 103 of the reverse laminated body 11, excessive deformation extending to the adjacent track portion can be suppressed. As a result, the optical recording medium 100 has reduced crosstalk in high-speed recording of the L1 layer and improved jitter.
- “transparent” in the transparent resin layer 105 means that it does not have a structure that scatters the laser beam 110 incident on the optical recording medium 100.
- the film thickness of the transparent resin layer 105 is usually 5 ⁇ m or more, preferably 10 ⁇ m or more, although it depends on the mechanism of the focus servo.
- the transparent resin layer 105 is usually preferably lOO x m or less.
- Examples of the material constituting the transparent resin layer 105 include a thermoplastic resin, a thermosetting resin, an electron beam curable resin, an ultraviolet curable resin (including a delayed curable type), and the like.
- the material constituting the transparent resin layer 105 is appropriately selected from these materials.
- a thermoplastic resin, a thermosetting resin, or the like can be formed by dissolving in an appropriate solvent as necessary to prepare a coating solution, coating it, and drying (heating).
- the ultraviolet curable resin can be formed by preparing a coating solution as it is or by dissolving in an appropriate solvent, and then applying the coating solution and curing it by irradiation with ultraviolet light. These materials can be used alone or in combination.
- the spin coating method is preferable.
- High-viscosity resins can be applied and formed by screen printing. It is preferable to use a UV curable resin that is liquid at 20 ° C. to 40 ° C. This is because productivity can be improved because it can be applied without using a solvent.
- an ultraviolet curable resin is preferable in terms of transparency and high curing time, and is advantageous in production.
- the ultraviolet curable resin include a radiocanore type ultraviolet curable resin and a cationic type ultraviolet curable resin, both of which can be used.
- radical ultraviolet curable resin a composition containing an ultraviolet curable compound and a photopolymerization initiator as essential components is used.
- UV curable compound 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.
- “attalylate” and “metaatherate” are collectively referred to as “(meth) arylate”.
- Examples of monofunctional (meth) acrylate include methyl, ethyl, propyl, butyl, aminole, 2-ethylhexyl, octyl, nonyl, dodecyl, hexadecyl, octadecyl, cyclohexyl, Benzyl, methoxyethyl, butoxychetyl, phenoxycetyl, nourphenoxychetyl, tetrahydrofurfuryl, glycidyl, 2-hydroxyethyl, 2-hydroxypropyl, 3-chloro-2-hydroxypropyl, dimethylaminoethyl, jetylaminoethyl, nonylsulfur (Meth) atalylate having a group such as enochetyltetrahydrofurfuryl, force prolatatone modified tetrahydrofurfuryl, isobornyl, dicyclopentanyl
- Examples of the polyfunctional (meth) acrylate include 1,3-butylene glycol, 1,4_butanediol, 1,5_pentanediol, 3_methyl-1,5_pentanediol, 1,6_ Hexanediol, neopentyl glycol, 1,8_octanediol, 1,9-nonanediol, tricyclodecane dimethanol, ethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, polypropylene glycol, etc. Examples thereof include di (meth) atalylate, di (meth) atalylate of tris (2-hydroxyethyl) isocyanurate, and the like.
- di (meth) acrylate of diol obtained by adding 4 mol or more of ethylene oxide or propylene oxide to 1 mol of neopentyl glycol, and 2 mol of ethylene oxide or propylene oxide to 1 mol of bisphenol A.
- Zio obtained by adding Di- or tri (meth) acrylate of triol obtained by adding 3 moles or more of ethylene oxide or propylene oxide to 1 mole of di (meth) acrylate, trimethylolpropane, 4 moles or more per mole of bisphenol Di (meth) acrylate, dimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol poly (meth) acrylate for addition of ethylene oxide or propylene oxide , Ethylene oxide-modified phosphoric acid (meth) acrylate, ethylene oxide-modified alkylated phosphoric acid (meth) acrylate, and the like.
- those that can be used together with these polymerizable monomers include polyester (meth) acrylate, polyether (meth) acrylate, epoxy (meth) acrylate, urethane (meth) acrylate as polymerizable oligomers. Rate and the like.
- the photopolymerization initiator a molecular cleavage type photopolymerization initiator or a hydrogen abstraction type photopolymerization initiator is preferable.
- Examples of the molecular cleavage type photopolymerization initiator include benzoin isobutyl ether, 2,4 jetylthioxanthone, 2-isopropylthioxanthone, benzyl, 2,4,6-trimethylbenzoyldiphenylphosphine.
- 1-hydroxycyclohexyl phenyl ketone, benzoinethyl ether, benzyldimethyl ketanol, 2-hydroxy-1-2-methyl-1-phenylpropane-1-one, 1- (4-isopropylphenyl) _ 2-— Hydroxy-1-methylpropane_1_one and 2-methyl-1- (4-methylthiophenyl) _2_morpholinopropane-1-one may be used in combination.
- Examples of the hydrogen abstraction type photopolymerization initiator include benzophenone, 4_phenylbenzophenone, isophthalphenone, 4-benzoyl-4'-methyl-1-diphenylsulfide and the like S.
- a sensitizer can be used in combination.
- the sensitizer include trimethylamine, methyldimethanolamine, triethanolamine, p-ethylaminoacetophenone, p-dimethylaminobenzoate, p-dimethylaminobenzoate.
- examples include isoamyl perfume, N, N-dimethylbenzylamine, and 4,4′_bis (jetylamino) benzophenone.
- 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-epoxyhydrin type, alicyclic epoxy, long chain aliphatic type, brominated epoxy resin, glycidyl ester type, glycidyl ether type, and heterocyclic type.
- Epoxy resin is preferably one that has 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.
- the ratio of the cationic polymerization type photoinitiator per 100 parts by weight of the cationic ultraviolet curable resin is usually 0.1 parts by weight or more, preferably 0.2 parts by weight or more, and usually 20 parts by weight or less. The range is preferably 5 parts by weight or less.
- a known photosensitizer can be used in combination in order to more effectively use the near-ultraviolet region and the visible region of the wavelength range of the ultraviolet light source. Examples of the photosensitizer in this case include anthracene, phenothiazine, benzylmethyl ketal, benzophenone, and acetophenone.
- antioxidants represented by thermal polymerization inhibitors, hindered phenols, hindered amines, phosphites and the like, plasticizers, and epoxies.
- Silane coupling agents typified by silane, mercaptosilane, (meth) acrylic silane and the like can also be blended for the purpose of improving various properties. These are selected from those having excellent solubility in UV curable compounds and those that do not inhibit UV transmission.
- the transparent resin layer 105 of the optical recording medium 100 of the present embodiment specific means for obtaining a resin having a relatively high elastic modulus is not particularly limited, but the following methods are usually mentioned.
- the ultraviolet curable resin described above a method of increasing the composition of a monomer component having 2 or more, preferably 3 or more, methacryloyl groups in the molecule; a polyester diol mixed with a linear polymer dial, etc.
- Method for increasing the composition of the side chain-containing polymer diol component Method for increasing the intramolecular bond by lowering the side chain of the oligomer component whose main chain is a hard segment; Polyisocyanate compound, amino resin, epoxy
- a crosslinking agent such as a compound, a silane compound, a metal chelate compound, etc. I can get lost.
- trimethylolpropane tri (meth) acrylate pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, Dipentaerythritol hexa (meth) acrylate is even more particularly preferred.
- diol di (meth) obtained by adding 2 mol of ethylene oxide or propylene oxide to norbornane dimethanol diatalylate, norbornane diethanol di (meth) acrylate, norbornane dimethanol.
- tricyclodecane dimethanol di (meth) acrylate and tricyclopentadecane diethanol di (meth) acrylate are particularly preferable.
- an acrylic monomer having a high crosslinking density with an acrylic monomer having a rigid cyclic structure in the crosslinked structure.
- the ultraviolet curable resins a cationic ultraviolet curable resin that has low light scattering property and low viscosity and can be applied by spin coating is preferable.
- there are many kinds of blending ratios and a large degree of freedom in composition and when the transparent resin layer 105 has a thickness of 10 / m or more, it is not necessary to consider the inhibition of curing by oxygen.
- the ability to use UV-based resin is preferable.
- the positive laminate 12 includes the substrate (2) 109, the recording layer (2) 108 laminated on the substrate (2) 109, the reflective layer (2) 107, and the protective coat layer 106 (hereinafter referred to as “the following”).
- the recording layer (2) 108, the reflective layer (2) 107, and the protective coat layer 106 may be collectively referred to as “L0 layer”.
- the substrate (2) 109 of the normal laminate 12 is made of the same material as the substrate (1) 101 of the reverse laminate 11. However, the substrate (2) 109 needs to be light transmissive.
- the groove width of the substrate (2) 109 is usually 2T / 10 or more, preferably 3T / 9 or more, where T is the track pitch. If it is this range, a sufficient reflectance can be secured.
- the groove width of the substrate (2) 109 is usually 148 nm or more, preferably 246 nm or more.
- the groove width of the substrate (2) 109 is usually 7T / 10 or less, preferably 6TZ10 or less.
- the groove width of the light-transmitting substrate (2) 109 is usually 518 nm or less, preferably 444 nm or less, because the groove shape transferability can be improved.
- the groove depth of the substrate (2) 109 is preferable since it can ensure a sufficient power reflectivity of usually ⁇ ZlO or more when the recording / reproducing light wavelength is ⁇ . More preferably, it is / 8 or more, and more preferably ⁇ / 6 or more.
- the groove depth of the substrate (2) 109 is usually 66 nm or more, preferably 82.5 nm or more, more preferably lOnm or more. is there.
- the upper limit of the groove depth of the substrate (2) 109 is usually 2 ⁇ / 5 or less because it can improve the transferability of the groove shape, and is preferably 2 ⁇ / 7 or less.
- the recording / reproducing wavelength is 660 nm, it is usually 264 nm or less, preferably 188.6 nm or less.
- the recording layer (2) 108 of the positive laminate 12 contains the same dye as the recording layer (1) 103 of the reverse laminate 11.
- the thickness of the recording layer (2) 108 of the positive laminate 12 is not particularly limited because the suitable film thickness varies depending on the recording method and the like. However, in order to obtain a sufficient degree of modulation, it is usually at least 20 ⁇ m, preferably 30 nm. Above, particularly preferably 40 nm or more. However, since it is necessary to transmit light, it is usually 200 nm or less, preferably 180 nm or less, more preferably 150 nm or less.
- the thickness of the recording layer (2) 108 indicates the thickness of the thick film portion (the thickness of the recording layer (2) 108 in the groove portion of the substrate (2) 109).
- the reflective layer (2) 107 of the regular laminate 12 is made of the same material as the reflective layer (1) 102 of the reverse laminate 11.
- the reflective layer (2) 107 of the positive laminate 12 has a light transmittance of 40% or more, in which absorption of the laser beam 110 that is recording / reproducing light incident from the substrate (2) 109 side is small, and Usually, it needs to have an appropriate light reflectance of 30% or more. For example, an appropriate transmittance can be obtained by providing a thin metal with high reflectivity. There is also It is desirable to have a degree of corrosion resistance.
- the recording layer (2) 108 located below the reflective layer (2) 107 is not affected by other components that exude from the upper layer (here, the transparent resin layer 105) of the reflective layer (2) 107. It is desirable to have a blocking property.
- the thickness of the reflective layer (2) 107 is usually 50 ⁇ m or less, preferably 30 nm or less, more preferably 25 nm or less, in order to ensure a light transmittance of 40% or more. In order to ensure an appropriate light reflectance of 30% or more, the thickness of the reflective layer (2) 107 is usually 3 nm or more, preferably 5 nm or more.
- the protective coating layer 106 of the regular laminate 12 is provided on the transparent resin layer 105 side of the reflective layer (2) 107 for the purpose of preventing oxidation of the reflective layer (2) 107, and preventing dust or scratches.
- the material of the protective coating layer 106 is not particularly limited as long as it protects the reflective layer (2) 107.
- the organic material include thermoplastic resins, thermosetting resins, electron beam curable resins, and ultraviolet ray curable resins.
- examples of the inorganic substance include dielectrics such as silicon oxide, silicon nitride, magnesium fluoride (MgF), and tin (IV) (SnO).
- the thickness of the protective coat layer 106 is usually in the range of 1 ⁇ m or more, preferably 3 ⁇ m or more, and usually 100 / im or less, preferably 30 ⁇ m or less, more preferably 10 ⁇ or less. If the thickness of the protective coat layer 106 is less than this range, curing failure due to oxygen may occur. On the other hand, if the thickness exceeds this range, the disc may be warped and a film thickness distribution is likely to occur.
- the protective coating layer 106 is not necessarily provided, and the transparent resin layer 105 may be directly formed on the reflective layer (2) 107.
- Information such as address information, medium type information, recording pulse conditions, and optimum recording power can be recorded on the optical recording medium of the present embodiment.
- the LPP or ADI P format described in the DVD-R and DVD + R standards may be used.
- FIG. 1 (b) is a sectional view schematically showing the configuration of the optical recording medium according to the second embodiment of the present invention.
- FIG. 1 (b) shows a film surface incident type optical recording medium 200 in which optical information is recorded / reproduced by recording / reproduction light incident from the side opposite to the substrate side.
- the optical recording medium 200 includes a substrate 201, a reflective layer 202 provided on the substrate 201, a recording layer 203 laminated on the reflective layer 202, and a recording layer 203.
- a transparent resin layer 205 is further laminated on the incident surface side of the laser beam 210 on the reverse laminate including the provided barrier layer 204.
- information is recorded and reproduced by a laser beam 210 irradiated onto the recording layer 203 from the transparent resin layer 205 side.
- the substrate 201 constituting the reverse laminated body is formed using the same material as the substrate (1) 101 of the reverse laminated body 11 in the optical recording medium 100 of the first embodiment.
- the materials constituting the reflective layer 202, the recording layer 203, and the barrier layer 204 are the reflective layer (1) 102 and the recording layer of the reverse laminate 11 in the optical recording medium 100 of the first embodiment, respectively.
- the same materials as those described in 103 and the barrier layer 104 can be used. Further, the thickness of each layer is the same as the range described in the optical recording medium 100.
- the transparent resin layer 205 is configured using the same material as the transparent resin layer 105 in the optical recording medium 100 described above, and the elastic modulus and thickness of the transparent resin layer 205 are the same as those in the first embodiment. It is adjusted to the same range as the transparent resin layer 105 in the optical recording medium 100 of the embodiment. In each of the above-described embodiments, any other layer may be provided between the layers as long as the function as the optical recording medium 100 is not impaired.
- the two-layer type optical recording medium as the second optical recording medium of the present invention comprises a first reflective layer on a substrate (this is referred to as "first substrate"), A first recording layer containing a dye, and a transparent resin layer in this order, and on the transparent resin layer, a second reflective layer, a second recording layer, and a transparent substrate In other words, the substrate is further provided in this order.
- the “substrate (1)” force in FIGS. 1A and 5 corresponds to the “first substrate”. Further, the “reflective layer (1)” in FIGS. 1A and 5 corresponds to the “first reflective layer”. Similarly, the “recording layer (1)” force in FIGS. 1 (a) and 5 corresponds to the above “first recording layer”.
- the “reflection layer (2)” in FIGS. 1A and 5 corresponds to the “second reflection layer”.
- the “recording layer (2)” force in FIGS. 1 (a) and 5 corresponds to the “second recording layer”.
- the “substrate (2)” force in FIGS. 1 (a) and 5 corresponds to the “transparent substrate”, that is, the “second substrate”.
- the first recording layer (second recording layer) is a metal-containing azo dye comprising, as a dye, an azo compound represented by the following general formula (1) and a Zn metal ion: (Hereinafter abbreviated as “metal-containing azo dye according to formula (1)”).
- R 1 is a hydrogen atom or an ester group represented by CO R 3 (where R 3 is a straight chain or a
- R 2 represents a linear or branched alkyl group.
- At least one of X 1 and X 2 is NHS 0 Y group (where Y is at least 2
- R 4 and R 5 each independently represents a hydrogen atom, a linear or branched alkyl group, or a linear or branched alkoxy group.
- the azo compound represented by) forms a coordinate bond with a metal ion.
- R 3 is preferably a linear or branched alkyl group having 1 to 4 carbon atoms, such as an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, a t-butyl group, or a sec-butyl group.
- a cycloalkyl group having 3 to 8 carbon atoms such as a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexenole group, or a cycloheptyl group; Particularly preferably, a straight-chain alkyl group having 1 or 2 carbon atoms such as a methyl group or an ethyl group; a cycloalkyl group having 3 to 6 carbon atoms such as a cyclopentyl group or a cyclohexenole group, because steric hindrance is small. ;
- R 2 is preferably a linear alkyl group having 1 to 6 carbon atoms, such as a methinole group, an ethyl group, a propyl group, a butyl group, a pentyl group, and a hexynole group; an isopropyl group, a sec butyl group, and an isobutyl group , T-butyl groups, 2-ethylhexyl groups, cyclopropyl groups, cyclohexylmethyl groups, etc., and branched alkyl groups having 3 to 8 carbon atoms.
- Y represents a linear or branched alkyl group substituted with at least two fluorine atoms.
- the linear or branched alkyl group is preferably a linear or branched alkyl group having 1 to 6 carbon atoms, and more preferably a linear alkyl group having 1 to 3 carbon atoms.
- R 5 is preferably a hydrogen atom, a linear alkyl group having 1 to 6 carbon atoms, or an alkoxy group having 1 to 8 carbon atoms.
- R 5 is more preferably a hydrogen atom, an alkyl group having 1 or 2 carbon atoms, or an alkoxy group having 1 or 2 carbon atoms.
- the alkyl group and alkoxy group are preferably unsubstituted.
- R 5 is particularly preferably a hydrogen atom, a methyl group, an ethyl group, or a methoxy group.
- R 6 , R 7 , R 8 , and R 9 each independently represent a hydrogen atom or an alkyl group having 1 or 2 carbon atoms. It is preferable to use a hydrogen atom or an alkyl group having 1 or 2 carbon atoms because the absorbance and refractive index can be easily adjusted to predetermined values.
- the hydrogen atom bonded to the carbon atom may be substituted with another substituent (for example, a halogen atom), but is preferably an unsubstituted alkyl group.
- Examples of the alkyl group having 1 or 2 carbon atoms include a methyl group and an ethyl group. Easy synthesis From the viewpoints of properties and steric structures, R 6 , R 7 , R 8 and R 9 are most preferably a hydrogen atom.
- the metal-containing azo dye according to the above formula (1) has (i) an appropriate calorific value, and (ii) has absorption in an appropriate wavelength region (the present inventors have described (i) and (Ii) is considered to be at least a factor contributing to the reaction in the heat mode.)
- the deactivation rate of the excited state is large (the present inventors (M) is considered to be a factor that contributes at least to the photon mode reaction.)
- jitter with a good balance between heat mode and photon mode decomposition reactions can be reduced, and crosstalk can be reduced. Therefore, when combined with the second recording layer of the two-layer optical recording medium, a remarkable effect is easily exhibited.
- the metal-containing azo dye according to the above formula (1) is applied to the second recording layer of the two-layer optical recording medium by the powerful 2P method (the recording layer on the side far from the laser beam incident side). By containing, a remarkable effect can be obtained.
- the metal-containing azo dye according to the above formula (1) is an azo dye that enables a high refractive index at a recording laser wavelength by a combination of its ligand and metal.
- the metal-containing azo dye according to) has a calorific value that is greater than a certain value. Further, by combining the central metal ion Zn 2 + and, in the case where the recording light becomes an excited state, increasing the radiative transition probabilities Or, it is considered that it decomposes at a very high speed without undergoing a non-radiative transition by causing an energy transfer with another molecule. That is, the recording layer containing the metal-containing azo dye according to the above formula (1) is considered to be decomposed, that is, the formation of the recording portion is completed in a very short time. As a result, the above-mentioned disturbance in high-speed recording is reduced, and good high-speed recording power with low jitter and crosstalk is achieved on the second recording layer of a two-layer optical recording medium. It's easy.
- the effect of reducing jitter can be recognized by, for example, widening the jitter asymmetry margin.
- the reduction in crosstalk can also be known by increasing the asymmetry margin.
- Examples of the metal-containing azo dyes represented by the general formula (1) include the following dyes.
- third embodiment of the present invention an embodiment relating to the above-described second optical recording medium of the present invention (hereinafter referred to as “third embodiment of the present invention”) will be described.
- FIG. 5 is a cross-sectional view schematically showing the configuration of the optical recording medium according to the third embodiment of the present invention.
- An optical recording medium 300 shown in FIG. 5 includes a recording layer (2) (second recording layer) 302 containing a dye on a disk-shaped substrate (2) 301 (second substrate), a translucent reflective layer ( 2) 303 (second reflective layer), transparent resin layer 304, recording layer containing dye (1) 305 (first recording layer), reflective layer (1) 306 (first reflective layer), adhesive layer 307 And a substrate (1) 308 (first substrate) in this order.
- the recording layer (2) 302 and the recording layer (1) 306 optical information is recorded and reproduced by the laser beam 310 incident from the substrate (2) 109 side.
- the substrate (2) 301, the recording layer (2) 302, and the reflective layer (2) 303 may be collectively referred to as a “positive laminate”.
- the recording layer (1) 305 force corresponds to the “second recording layer” described above.
- a transparent resin layer 304 is formed on the reflective layer (2) 303.
- a 2P (Photo Polymerization) method is usually used as a method for forming the transparent resin layer 304.
- the guide groove is formed in the transparent resin layer 304 (this may be referred to as “intermediate layer”) using the 2P method, The procedure is generally as follows.
- a photocurable resin raw material that is cured by light typified by radiation such as ultraviolet rays is applied to form a resin raw material layer.
- a stamper having a concave / convex shape for transfer (hereinafter appropriately referred to as “uneven shape for transfer”) is placed thereon.
- the stamper is peeled off. In this way, the uneven shape for transfer of the stamper is transferred to the surface of the photocurable resin, and the transparent resin layer 304 (2P layer) having the uneven shape, that is, the guide groove, is formed by the cured product of the photocurable resin. It has become possible to do.
- the depth of the guide groove should be in the range of (1/100) X ⁇ or more and (1/6) X ⁇ or less.
- “E” represents the recording / reproducing wavelength of the laser beam 310.
- stamper for example, a stamper formed of cyclic polyolefin or polystyrene resin can be used.
- various electron beam curable materials described as the material of the transparent resin layer 105 of the optical recording medium 100 described in the section of the first embodiment are used. Examples thereof include resins and ultraviolet curable resins.
- a recording layer (1) 305 which is a second recording layer is formed on the transparent resin layer 304.
- the dye of the recording layer (1) 305 at least the metal-containing azo dye according to the above formula (1) is used. Any one of the metal-containing azo dyes according to the above formula (1) may be used alone, or two or more thereof may be used in any combination and ratio. In addition to one or more metal-containing azo dyes according to the above formula (1), other one or more kinds of dyes may be used in combination. There are no particular restrictions on the types of other dyes that can be used in combination with the metal-containing azo dye according to the above formula (1).
- Examples include the same dyes as those used for the recording layer (1) 103 of the optical recording medium 100 described in the section of the “first embodiment”.
- the details of the recording layer (1) 305 other than the dyes, the details of the formation method, and the like are also described in detail in the recording layer (1) 103 of the optical recording medium 100 described in the section of the first embodiment. The same is true.
- the reflective layer (1) 306 is formed on the recording layer (1) 305.
- the details of the material and forming method of the reflective layer (1) 306 are the same as those of the optical recording medium 100 described in the section of the first embodiment.
- the details of the spray layer (1) 102 are the same.
- the substrate (1) 308 is provided on the reflective layer (1) 306.
- the details of the material and the like of the substrate (1) 308 are the same as the details of the substrate (1) 101 of the optical recording medium 100 described in the section [First Embodiment].
- the method of providing the substrate (1) 308 on the reflective layer (1) 306 is not particularly limited. Usually, as shown in FIG. 5, a preformed substrate (1) 308 is prepared, and this is applied to the reflective layer. (1) It is formed by bonding onto 306 via an adhesive layer 307.
- the material of the adhesive layer 307 is not particularly limited. Examples include various curable resins similar to the transparent resin layer 105 of the optical recording medium 100 described in the section of the first embodiment, various conventional adhesives, pressure-sensitive double-sided tape, etc. Is mentioned.
- the curable resin is cured on the reflective layer (1) 306 by the same coating method as that for the transparent resin layer 105 of the optical recording medium 100 described in the section of the first embodiment.
- a layer made of a resin raw material (curable resin raw material layer) is formed, and a substrate (1) 308 is placed thereon and pressed, and conditions for curing the curable resin raw material during or after pressing (ultraviolet curing)
- curable resin raw material irradiation with ultraviolet rays or radiation, and in the case of a thermosetting resin, heating is applied
- the curable resin raw material is cured to form an adhesive layer 307 made of the curable resin.
- the reflective layer (1) 306 and the substrate (1) 308 are bonded via the adhesive layer 307.
- an adhesive is applied on the reflective layer (1) 306 by a method such as screen printing, and the substrate (1) 308 is placed thereon and pressed, whereby the adhesive layer In addition to forming 307, the reflective layer (1) 306 and the substrate (1) 308 are bonded via the adhesive layer 307.
- an adhesive layer 307 is formed by pressing the pressure-sensitive double-sided tape between the reflective layer (1) 306 and the substrate (1) 308.
- the reflective layer (1) 306 and the substrate (1) 308 are bonded to each other through the adhesive layer 307.
- the light transmittance of the adhesive layer 307 formed by the above method is not particularly limited, and may be transparent or opaque.
- the thickness of the adhesive layer 307 is not particularly limited, but is usually in the range of 1 z m or more, preferably 3 x m or more, and usually 300 z m or less, preferably 100 ⁇ m or less.
- optical recording medium 300 according to the third embodiment has been described above.
- the embodiment can be implemented with any modification without being limited thereto.
- another arbitrary layer may be provided between the layers of the optical recording medium 300 described above.
- examples of other layers include a protective coating layer provided between the reflective layer (2) 303 and the transparent resin layer 304, and a barrier layer provided between the transparent resin layer 304 and the recording layer (1) 305.
- the details of the material and forming method of the protective coat layer and the barrier layer are the same as the details of the protective coat layer 106 and the barrier layer 104 of the optical recording medium 100 described in the section of the first embodiment.
- a solution (concentration: 2% by weight) was prepared, dropped onto the above-mentioned reflective layer (1), spin-coated, and then dried at 70 ° C. for 30 minutes to form a recording layer (1).
- the film thickness of the recording layer (1) in the groove portion of the substrate (1) (the groove portion of the reverse laminate in FIG. 1 (a), that is, the film thickness of the recording layer far from the incident laser beam) is about 70 nm.
- Thickness of the recording layer (1) in the inter-groove portion was about 60 nm.
- the OD value of the recording film was 1.20.
- the barrier layer made of each composition described in Table 2 of [Experimental Example 1] is formed on the recording layer (1) without taking as much time as possible.
- the film thickness of the barrier layer was adjusted to 2 nm by adjusting the sputtering time.
- the pre-sputtering was performed before the sputtering of the NOR layer. In this way, a reverse laminated disc 1 was prepared.
- a polycarbonate substrate (2) having a guide groove having a depth of 160 nm, a width of 360 nm and a track pitch of 740 nm was prepared, and the above-mentioned metal-containing metal was formed on the surface of the substrate (2) on which the guide groove was formed.
- the thickness of the recording layer (2) (the thickness of the recording layer in the groove of the positive laminate in FIG. 1 (a)) was about 80 nm.
- an Ag_Bi alloy (Bi: 1.0 atomic%) was formed on the recording layer (2) by sputtering so as to have a thickness of 17 ⁇ m, thereby forming a reflective layer (2).
- an ultraviolet curable resin (radical ultraviolet curable resin SD347 manufactured by Dainippon Ink Co., Ltd.) is spin-coated and cured to provide a film thickness of 3 ⁇ m to 4 ⁇ m.
- a positively laminated disc 2 was prepared.
- the elastic modulus and glass transition temperature Tg of Resin A are determined by a dynamic viscoelasticity tester (leopipe mouth). (DDV series) and a measurement frequency of 3.5 Hz and a heating rate of 3 ° C / min.
- the conditions for high-speed recording of optical information on the disc 1 which is a reverse laminate are as follows.
- NA 0.65 of objective lens
- the recording speed was 2.4 times that of DVD (linear speed: 9.2 mZs).
- the recording power was 17 mW to 25 mW.
- Jitter (data-to-clock jitter) measurement was performed while playing back at 1x speed.
- MT (%) force is a value that reflects the signal quality of the optical disc.
- MT (%) generally needs to be 13% or less, preferably 10% or less, and more preferably 9% or less. If it exceeds 13%, the error tends to increase.
- ST (%) is preferably 10% or less. More preferably 9% or less, still more preferably
- the difference between ST (%) and MT (%), that is, Ajitter, is preferably 2% or less, more preferably 1.6% or less, and even more preferably 1% or less. Beyond that, MT (%) may exceed 13%.
- a two-layer optical recording medium (two-layer DVD-R disc) was prepared in which a disc 1 was provided with a 2 nm barrier layer made of the materials shown in Table 2 below.
- DVD-R 2.4 ⁇ speed recording was performed on the obtained optical recording medium disc 1 under the above-mentioned conditions, and ST (%), MT (%), and Ajitter were measured. Obtained ST (%), MT (%), Ajitter results Is shown in Table 2 below.
- Figure 2 shows a graph plotting thermal conductivity on the horizontal axis and ⁇ jitter on the vertical axis for materials with ST (%) of 9% or less. In the graph of Figure 2, “ ⁇ ” corresponds to each material. From the graph in Fig.
- the thermal conductivity increases abruptly when the thermal conductivity is greater than 70WZm'K (Sn thermal conductivity 67WZmK). Furthermore, when the thermal conductivity is 90 W / m'K or higher, except for Si and C, which are semiconductors, the Ajitter is 1% or lower, indicating that very good characteristics can be obtained. For Si and C, it is considered possible to improve the characteristics by mixing other metal components.
- Figure 4 shows the ST (%) and MT (%) graphs obtained using various materials for the barrier layer. From the graph of Fig. 4, the recording characteristics of Al (thermal conductivity 237W / mK), Mo (thermal conductivity 138WZm.K), W (thermal conductivity 174WZm * K), Cu (thermal conductivity 401W / mK) are extremely It turns out that it is favorable.
- Both Co and Cr had good sensitivity and good jitter in 4x speed recording and 8x speed recording.
- Ag, Al, Si, and C may become a barrier layer with good recording characteristics and weather resistance by alloying or improvement of the photo-curing resin.
- Ma may improve characteristics such as MT (%) and ST (%) by adjusting the recording pulse strategy.
- Au tends to be slightly inferior because the recording pulse margin is narrow. This is thought to be due to the mechanical properties of the Au film at high temperatures.
- Nb and Ta with ST (%) exceeding 10% have small ⁇ jitter of 0.9% and 0.4%, respectively, but the jitter of each mark length is all bad, so the recording strategy condition However, this jitter value could not be improved. Therefore, it can be seen that Nb (thermal conductivity 54 W / m-K) and Ta (thermal conductivity 58 W / m′K) cannot be selected as the material of the barrier layer of the present invention.
- Mo and Co thermal conductivity 100 W / m'K having the prescribed thermal conductivity, and ZnS—SiO as a dielectric film are used as materials for comparison, and the above procedure is followed.
- a two-layer type optical recording medium (two-layer DVD-R disc) was prepared in which a disc 1 was provided with a rear layer having a thickness shown in Table 3 below.
- DVD-R 2.4 ⁇ speed recording was performed on the obtained optical recording medium disc 1 under the above conditions, and ST (%), ⁇ (%), and ⁇ jitter were measured.
- the obtained ST (%), MT (%), and Ajitter results are shown in Table 3 below.
- Figure 3 shows a graph plotted with the barrier layer thickness on the horizontal axis and ⁇ jitter on the vertical axis.
- optical recording media having Mo and Co barrier layers with thermal conductivity exceeding 70 W / mK tend to reduce Ajitter when the film thickness becomes thinner than 5 nm. As seen, it shows better jitter than ZnS-SiO. Especially for film thickness around 3nm, Mo
- ZnS-SiO has a ⁇ jitter of around 2% regardless of the film thickness.
- polycarbonate is injection-molded to produce a groove force S with a pitch of 0.74 / im, a width of 340nm, a depth of 28nm, a diameter of 120mm, and a thickness.
- a 0.60 mm substrate (1) was formed.
- an Ag—Bi—Nd alloy was deposited to a thickness of 80 nm on this substrate (1) by sputtering to form a reflective layer (1).
- the OD value of the recording film on which the recording layer (1) was formed was 1.20.
- the calorific value of the dye B in the nitrogen atmosphere is 40.7 Cal / g
- the decomposition temperature is 278 ° C
- the dye B has a calorific value appropriate for at least heat mode recording. I understood.
- the calorific value and the decomposition temperature were measured using a TG / DTA6200 manufactured by Seiko I / f Instrument Co., under the conditions of a temperature rising rate of 10 ° C / min and a sample amount of about 4 mg.
- the absorption maximum wavelengths of the dye-coated film of Dye B are 554. lnm and 601.9 (strong) nm.
- Dye B has an absorbance at its absorption maximum in the vicinity of the recording wavelength of 660 nm. 15. It was found that the dye has an appropriate amount of absorption for recording on the second recording layer of the two-layer type optical recording medium of 15. 5%.
- a layered disc 1 was prepared.
- a polycarbonate substrate (2) having guide grooves having a depth of 160 nm, a width of 360 nm, and a track pitch of 740 nm was prepared, and the dye A and the above-described dye A and the above were formed on the surface of the substrate (2) on which the guide grooves were formed.
- a recording layer (2) was formed. The thickness of the recording layer (2) (the thickness of the recording layer in the groove of the positive laminate in FIG.
- the elastic modulus and glass transition temperature Tg of Resin A were measured using a dynamic viscoelasticity tester (manufactured by Leo Piven Kun: DDV series), measuring frequency 3.5 Hz, heating rate 3 ° C / Measured under min condition.
- the conditions for high-speed recording of optical information on the disc 1 (reverse laminate) are as follows.
- the recording speed was set to 4 times the speed of DVD (4 X recording) (linear speed: 15.3 m / s).
- the recording pulse strategy conformed to DVD + Recordable Dual Layer 8.5 Gbytes Basic Format Specifications version 1.1.
- the recording power was 20 mW to 40 mW.
- Jitter (data-to-clock jitter) measurement was performed at 1x speed.
- Fig. 6 (a) is a graph showing the relationship between jitter and asymmetry in the reverse laminate of the optical recording medium produced in Experimental Example 4, and Fig. 6 (b) is produced in Experimental Example 4. 6 is a graph showing the relationship between jitter and recording power in the reverse laminated body of the optical recording medium.
- “Asymmetry” is the value specified as “asymmetry” in the DVD-R or DVD + R standard. If the asymmetry is positive, it means that the recording has been performed with a sufficiently large recording power. If the asymmetry is negative, it means that the recording power is insufficient.
- Fig. 6 (a) shows the asymmetry margin of jitter of the reverse laminate including the recording layer (1) in which the recording layer (1) contains the coloring power Zn as the central metal ion, shown as "Dye A + Dye B".
- asymmetry is reduced from -5% (corresponding to "0 ⁇ 05" in Fig. 6 (a)) to + 15% ( In Fig. 6 (a), it corresponds to “0.15”.) Even if it is changed over a very wide range up to a value slightly exceeding, it can be seen that a good jitter of 9% can be secured.
- Fig. 6 (b) shows the results of measuring MT% of 4 X recording of the above reverse laminate of “Dye A + Dye B” and “Dye A + Dye C” while changing the recording laser power. Show. Also in ⁇ %, the combination of “Dye ⁇ + Dye ⁇ ” is superior to the combination of “Dye ⁇ + Dye C”.
- a predetermined ultraviolet curable resin [1] for forming a transparent resin layer is dropped in a circular shape on the reflective layer (2), and a film having a thickness of about 25 zm is formed by a spinner method. did.
- a predetermined ultraviolet curable resin [2] was dropped in a circular shape on the surface of the resin stamper where the guide groove was formed, and a film having a thickness of about 25 ⁇ m was formed by a spinner method.
- a resin stamper is bonded onto the reflective layer (2) so that the resin layer made of the ultraviolet curable resin [1] and the resin layer made of the ultraviolet curable resin [2] face each other. It was. Subsequently, ultraviolet rays were irradiated from the resin stamper side to cure and bond these resin layers, thereby forming an adhesive body having a transparent resin layer (2P layer) having guide grooves.
- the formed guide groove on the transparent resin has a track pitch force of .74 xm and a groove width of 290 nm. Was 190 nm.
- UV curable resins [1] and [2] As the ultraviolet curable resins [1] and [2], the following radical ultraviolet curable resins were used, respectively.
- the glass transition temperatures of the UV curable resins [1] and [2] are shown in parentheses.
- the calorific value of Dye B in the nitrogen atmosphere is 40.7 CalZg, the decomposition temperature is 278 ° C.
- the calorific value of Dye D in the nitrogen atmosphere is 34. l Cal / g, the decomposition temperature. It was found that any of these dyes having a central metal ion of Zn 2+ at 251 ° C. has a calorific value appropriate for at least heat mode recording.
- the calorific value and decomposition temperature were measured using a TG / DTA6200 manufactured by Seiko Instruments Inc., under a temperature increase rate of 10 ° C / min, and a sample amount of about 4 mg.
- the absorption maximum wavelength of the dye-coated film of Dye B is 554.
- Dye B has an absorbance at its absorption maximum in the vicinity of the recording wavelength of 660 nm. 15. It can be seen that the dye has an appropriate amount of absorption for recording on the second recording layer of the two-layer type optical recording medium of 15. 5%.
- the absorption maximum wavelength of the dye coating film of Dye D is 561.6 nm and 608.3 (strong) nm.
- Dye D has an absorption maximum of 20 near the recording wavelength of 660 nm. .
- the dye has an appropriate amount of absorption for recording on the second recording layer of the two-layer type optical recording medium of 1%.
- a reflective layer (1) having a thickness of 120 nm was formed by sputtering using an Ag alloy made of Ag-Bi (Bi: 1.0 atomic%).
- an ultraviolet curable resin was spin-coated on the reflective layer (1) to provide an adhesive layer. Then, 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 substrate (2), which was cured by being irradiated with ultraviolet rays and adhered. A two-layer optical recording medium by the 2P method was produced as described above.
- the conditions for high-speed recording of optical information on the recording layer (1) of the two-layer optical recording medium are as follows.
- the recording speed was set to 8x DVD (8X recording) (linear speed 30.67mZs).
- the recording power was 40 mW to 52 mW.
- FIG. 7 is a graph showing the relationship between jitter and asymmetry in the recording layer (1) of the optical recording medium produced in Experimental Example 5.
- Dye B and Dye D are changed to Dye C whose central metal ion is Ni 2+ and Dye A:
- Dye ⁇ 50 wt%: The above-mentioned 8 ⁇ speed recording was performed on the recording layer (1) of the two-layer type optical recording medium obtained in exactly the same manner except that 50 wt%. The result is the curve shown as “Dye A + Dye C” in FIG.
- the calorific value of Dye C in a nitrogen atmosphere was 27.6 Cal / g, and the decomposition temperature was 348 ° C.
- the absorption maximum wavelength of the dye coating film of Dye C is 547. l lnm and 5 97.05 nm, and Dye C is 14.4% of the absorption maximum of the absorption maximum near the recording wavelength of 660 nm. It was found to be a dye having absorption.
- the absorption spectrum of the film of Dye C was slower than Dye B and D.
- the present invention can be suitably used in applications such as an optical recording medium for red semiconductor lasers such as DVD soil R and an optical recording medium for blue semiconductor lasers.
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- Inorganic Chemistry (AREA)
- Organic Chemistry (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
- Thermal Transfer Or Thermal Recording In General (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP06731395A EP1873771B1 (en) | 2005-04-07 | 2006-04-07 | Optical recording medium |
CN2006800110274A CN101156203B (zh) | 2005-04-07 | 2006-04-07 | 光记录介质 |
US11/910,980 US8075972B2 (en) | 2005-04-07 | 2006-04-07 | Optical recording medium |
HK08106509.3A HK1116288A1 (en) | 2005-04-07 | 2008-06-12 | Optical recording medium |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005111244 | 2005-04-07 | ||
JP2005-111244 | 2005-04-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006109722A1 true WO2006109722A1 (ja) | 2006-10-19 |
Family
ID=37086995
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2006/307448 WO2006109722A1 (ja) | 2005-04-07 | 2006-04-07 | 光記録媒体 |
Country Status (6)
Country | Link |
---|---|
US (1) | US8075972B2 (ja) |
EP (1) | EP1873771B1 (ja) |
CN (1) | CN101156203B (ja) |
HK (1) | HK1116288A1 (ja) |
TW (1) | TW200703313A (ja) |
WO (1) | WO2006109722A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008038603A1 (fr) * | 2006-09-25 | 2008-04-03 | Mitsubishi Kagaku Media Co., Ltd. | Colorant azo-chélate métallique et support d'enregistrement optique |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1615214A4 (en) * | 2003-04-14 | 2008-07-23 | Mitsubishi Kagaku Media Co Ltd | OPTICAL RECORDING MEDIUM AND ASSOCIATED RECORDING / REPRODUCING METHOD |
JP2010225572A (ja) * | 2008-11-10 | 2010-10-07 | Kobe Steel Ltd | 有機elディスプレイ用の反射アノード電極および配線膜 |
JP6763402B2 (ja) * | 2015-12-25 | 2020-09-30 | Agc株式会社 | 反射型透明スクリーン |
JP7183171B2 (ja) * | 2017-10-06 | 2022-12-05 | シーエムシー マグネティクス コーポレーション | 光ディスク及び光ディスクの製造方法 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005050497A (ja) * | 2003-07-16 | 2005-02-24 | Ricoh Co Ltd | 光記録媒体 |
JP2005071492A (ja) * | 2003-08-26 | 2005-03-17 | Fuji Photo Film Co Ltd | 光情報記録媒体 |
JP2005085350A (ja) * | 2003-09-08 | 2005-03-31 | Fuji Photo Film Co Ltd | 光情報記録方法および光情報記録媒体 |
JP2005088210A (ja) * | 2003-09-12 | 2005-04-07 | Fuji Photo Film Co Ltd | 光情報記録媒体および情報記録方法 |
JP2005088293A (ja) * | 2003-09-16 | 2005-04-07 | Fuji Photo Film Co Ltd | 光情報記録媒体および情報記録方法 |
Family Cites Families (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4115321C2 (de) * | 1990-05-09 | 1995-06-01 | Hitachi Ltd | Informationsaufzeichnungsschicht und Informationsaufzeichnungsmaterial sowie Verfahren zu ihrer Herstellung |
JP2000207772A (ja) | 1999-01-08 | 2000-07-28 | Ricoh Co Ltd | 光情報記録媒体 |
JP2000311384A (ja) | 1999-04-26 | 2000-11-07 | Fuji Photo Film Co Ltd | 光情報記録媒体 |
RU2002101129A (ru) * | 2000-04-20 | 2003-09-27 | Конинклейке Филипс Электроникс Н.В. (Nl) | Носитель оптической записи |
WO2002054396A1 (fr) * | 2000-12-28 | 2002-07-11 | Sony Corporation | Support d'enregistrement optique |
JP4076739B2 (ja) | 2001-06-13 | 2008-04-16 | 富士フイルム株式会社 | 光記録媒体 |
JP2003036562A (ja) | 2001-07-23 | 2003-02-07 | Mitsubishi Chemicals Corp | 光学記録媒体 |
JP2003217174A (ja) * | 2002-01-21 | 2003-07-31 | Pioneer Electronic Corp | グルーブ間記録方式による光ディスク |
JP2003308633A (ja) * | 2002-04-10 | 2003-10-31 | Hitachi Maxell Ltd | 光記録媒体及びその記録再生方法 |
KR100994943B1 (ko) * | 2002-08-29 | 2010-11-18 | 코닌클리케 필립스 일렉트로닉스 엔.브이. | 다층 광 데이터 저장매체 및 이를 이용한 다층 기록방법 |
EP1615214A4 (en) * | 2003-04-14 | 2008-07-23 | Mitsubishi Kagaku Media Co Ltd | OPTICAL RECORDING MEDIUM AND ASSOCIATED RECORDING / REPRODUCING METHOD |
JP4238170B2 (ja) | 2003-04-14 | 2009-03-11 | 三菱化学メディア株式会社 | 光記録媒体 |
JP2005078655A (ja) | 2003-08-29 | 2005-03-24 | Fuji Photo Film Co Ltd | 光情報記録媒体 |
JP2005100493A (ja) | 2003-09-22 | 2005-04-14 | Ricoh Co Ltd | 光記録媒体とその製造方法 |
JP2005267670A (ja) | 2004-03-16 | 2005-09-29 | Ricoh Co Ltd | 2層型光記録媒体及びその製造方法 |
JP2005267671A (ja) | 2004-03-16 | 2005-09-29 | Ricoh Co Ltd | 2層型光記録媒体 |
US20050221050A1 (en) * | 2004-03-19 | 2005-10-06 | Michiaki Shinotsuka | Two-layered optical recording medium, method for manufacturing the same, and, method and apparatus for optical recording and reproducing using the same |
US20070283377A1 (en) * | 2004-04-13 | 2007-12-06 | Yuki Nakamura | Two-Layered Optical Recordable Medium, Recording and Reproducing Method Thereof, and Optical Recording and Reproducing Apparatus Using the Same |
KR20070093321A (ko) * | 2004-06-23 | 2007-09-18 | 후지필름 가부시키가이샤 | 신규 옥소놀 색소 화합물 및 광정보기록매체 |
TW200727287A (en) * | 2006-01-05 | 2007-07-16 | Prodisc Technology Inc | Optical information storage medium |
-
2006
- 2006-04-07 WO PCT/JP2006/307448 patent/WO2006109722A1/ja active Application Filing
- 2006-04-07 TW TW095112396A patent/TW200703313A/zh unknown
- 2006-04-07 US US11/910,980 patent/US8075972B2/en not_active Expired - Fee Related
- 2006-04-07 EP EP06731395A patent/EP1873771B1/en not_active Ceased
- 2006-04-07 CN CN2006800110274A patent/CN101156203B/zh not_active Expired - Fee Related
-
2008
- 2008-06-12 HK HK08106509.3A patent/HK1116288A1/xx not_active IP Right Cessation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005050497A (ja) * | 2003-07-16 | 2005-02-24 | Ricoh Co Ltd | 光記録媒体 |
JP2005071492A (ja) * | 2003-08-26 | 2005-03-17 | Fuji Photo Film Co Ltd | 光情報記録媒体 |
JP2005085350A (ja) * | 2003-09-08 | 2005-03-31 | Fuji Photo Film Co Ltd | 光情報記録方法および光情報記録媒体 |
JP2005088210A (ja) * | 2003-09-12 | 2005-04-07 | Fuji Photo Film Co Ltd | 光情報記録媒体および情報記録方法 |
JP2005088293A (ja) * | 2003-09-16 | 2005-04-07 | Fuji Photo Film Co Ltd | 光情報記録媒体および情報記録方法 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008038603A1 (fr) * | 2006-09-25 | 2008-04-03 | Mitsubishi Kagaku Media Co., Ltd. | Colorant azo-chélate métallique et support d'enregistrement optique |
Also Published As
Publication number | Publication date |
---|---|
EP1873771B1 (en) | 2011-11-30 |
US8075972B2 (en) | 2011-12-13 |
CN101156203B (zh) | 2010-09-15 |
EP1873771A1 (en) | 2008-01-02 |
CN101156203A (zh) | 2008-04-02 |
TW200703313A (en) | 2007-01-16 |
HK1116288A1 (en) | 2008-12-19 |
EP1873771A4 (en) | 2010-10-27 |
US20090022933A1 (en) | 2009-01-22 |
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