Abstract: A security card is disclosed which comprises a laminate of a flexible glass layer and a support, characterised in that the glass layer has a thickness of not more than 350 &mgr;m. The thin glass layer has sufficient flexibility to allow substantial bending of the card without causing breakage of the glass. In addition, the glass layer acts as a security feature because delamination in order to falsify information stored in the card is very difficult without breaking the glass. The glass is also an efficient barrier layer protecting the information stored in the card from mechanical damage and from degradation due to permeation of gases such as oxygen or water vapour.

Abstract: An optical disc used for information recording capable of suppressing an increase of birefringence of the light-transmitting layer at the minimum, resulting in an optical disc having a high quality without a degradation of signal characteristics. The optical disc has a substrate having a group of pits/grooves representing information signal on a surface thereof, a reflecting layer formed on the substrate, and a resin film formed on the reflecting layer through an adhesive layer, wherein a thickness of the adhesive layer is made to be not more than 100 &mgr;m, and a product value of a photoelasticity constant, a modulus of tension elasticity and a thickness with respect to the resin film is established within −0.2 to 0.2 mm.

Abstract: A magnetic recording medium comprising first, second and third magnetic layers laminated in succession, wherein when (1) the magnetic wall energy density, saturation magnetization, magnetic wall coercivity and film thickness of the first magnetic layer at a temperature T represented by cgs unit system are defined as &sgr;1, Ms1, Hw1 (2) h1, respectively, and the magnetic wall energy density, saturation magnetization, magnetic wall coercivity and film thickness of the third magnetic layer are defined as &sgr;3, Ms3, Hw3 and h3, respectively, (3) the interface magnetic wall energy density between the first magnetic layer and the third magnetic layer is defined as &sgr;w13, and (4) the lowest temperature at which &sgr;w13 is 0 erg/cm2 is Ts, at least 2Ms1*Hw1<&sgr;w13/h1  and 2Ms3*Hw3>&sgr;w13/h3  are satisfied, at room temperature and when a suitable temperature Tp is chosen, within a temperature range greater than the temperature Ts and lower by 10° C.

Abstract: A half-transmissive film of an optical disk is formed using a Cu oxide instead of Au, while achieving similar reflectivity characteristics to those of Au. Alternatively, the half-transmissive film may comprise a compound of Cu with a corrosion-resistant material, or a stack of layers comprising a lower layer film of Cu, Ag, or Al and an upper layer film of a corrosion-resistant material. Further, the half-transmissive film may comprise ZnS.SiO2, a nitride of Ti, indium-tin-oxide, or an alloy of Au and Cu or a compound including Au and Cu.

Abstract: A rewritable optical information medium includes a substrate coated with two carbide layers, a phase-change recording layer between two carbide layers, and a light-absorptive layer of a material like Si, Ge, Mo, or W to slow the cooling when scanned with laser light so that the medium can be used for high data rate recording. The material is capable of a user data bit rate of 50 Mbit/s.

Abstract: An optical recording medium comprising, in the following order, a substrate, a reflecting layer, a lower dielectric layer, an optical recording layer, the optical recording layer recording information by means of change in a physical property of the optical recording layer which is generated by an applied light beam, the change in a physical property of the optical recording layer being conducted at an operating temperature, and an upper dielectric layer, wherein the substrate has a thermal deformation temperature lower than the operating temperature and the optical recording medium further comprises a thermally insulating layer between the substrate and the reflecting layer.

Abstract: The invention provides an optical disc comprising a circular glass substrate (2) having information-carrying means (3) on one major surface. A protective member (4) of a resin includes a circular flat portion (42) and an annular rim (41) extending perpendicular from the periphery of the flat portion (42). The glass substrate (2) is integrally joined to the protective member (4) such that the information-carrying means (3) of the glass substrate (2) may face the covering portion (42) of the protective member (4). The outer side of the glass substrate (2) is surrounded by the protective member rim (41) to leave a shock absorbing space therebetween. The invention prevents the glass substrate from failure at its corner when impact is applied to the disc.

Abstract: The present invention relates to an optical recording medium having a protective layer and a phase-change recording layer on a substrate, said protective layer containing a metallic oxysulfide and an optical recording medium having a protective layer and a phase-change recording layer, said protective layer being formed by sputtering using a target comprising a metallic oxysulfide.

Abstract: The invention relates to an optical storage medium comprising a substrate and a storage layer, wherein the storage layer comprises a compound of the formula (I) or (II) in which A and A′, independently of one another, are unsubstituted or mono- or di-halo-, -hydroxy-, —C1-C6alkyl-, —C1-C6alkoxy-, -cyano- or -nitro-substituted phenyl, pyridyl, pyrrolyl, imidazolyl, furyl or thienyl, which can, if desired, be fused to a benzene ring, are halide, tetrafluoroborate or unsubstituted or with one or more halogen substituted C1-C6alkane-sulfonate, benzenesulfonate, C1-C6alkylbenzenesulfonate, C1-C6alkylsulfate or di-C1-C6alkyl-phosphonate of N—C1-C6alkyl-pyridiniumyl, or are unsubstituted or mono- or di-hydroxy-substituted C2-C6alkyl or C2-C6alkenyl, whose chain may be uninterrupted or interrupted by one or two oxygen atoms, B and B′, independently of one another, are 2 H, S, S2 or SO2, and n and n′, independently of one another, are each a number from 1 to 4.

Abstract: An optical recording medium is provided which achieves a higher recording capacity. This optical recording medium includes a base formed of thermoplastic resin which has a thickness ranging from between approximately 0.3 to 1.2 mm, a guide groove formed on the base, an information recording layer formed at least of a reflective film and an organic dye recording layer provided on the guide groove, and a light transmissive layer having a thickness ranging from between approximately 3 to 177 &mgr;m. In this optical recording medium, the unevenness &Dgr;t of the thickness of the light transmissive layer is set within the range of: &Dgr;t≦±5.26(&lgr;/N.A.4)(&mgr;m) wherein N.A. represents a numerical aperture of an optical head device of the optical disk recording and/or reproducing apparatus and &lgr; represents the wavelength of laser light utilized by the optical disk recording and/or reproducing apparatus.

Abstract: The present invention provides an optical disc capable of effectively reducing a reproduction signal jitter value and obtaining a wider record power margin assuring a reproduction limit jitter value to obtain a preferable recording/reproduction characteristic even after a number of times of recording repeated. The optical disc includes the following films successively formed on a substrate 2: a first dielectric film 3; a phase change recording film 4 whose phase is changed between a crystalline state and an amorphous state thereby to record an information signal; a second dielectric film 5; and a light reflection film formed on the phase change recording film 4 and constituted by an Al alloy containing Cu in a range from 0.1 to 1.0 atomic %.

Abstract: A recordable optical medium includes a transparent substrate, a dye recording layer on the transparent substrate, a reflective layer provided on the dye layer wherein the reflective layer comprises a mixture of silver and palladium in such proportions that the palladium comprises between 0.25 and 2.5 atomic percent of the mixture, and a protective layer formed over the reflective layer.

Abstract: A very-high-density memory device which utilizes a scintillating medium for data storage. In one mode, the device operates as a read-only-memory (ROM) unit. In another mode, the device functions as a one-time-write (OTW) and then read-only-memory unit. In an exemplary embodiment, information is read at high data rates from a rotating data-storage disk or cylinder with an electron beam and sensitive photodetector. Two methods of following the data tracks on the storage medium are provided. Masks are provided for use in patterning the data or data tracks. These masks may also be used to pattern very-high-density media for other applications such as magnetic memory and optical near-field memory. A method of patterning radially-periodic structures using interferometric lithography is also provided.

Abstract: A phase change optical recording medium has on a substrate a recording layer consisting essentially of a Sb base thin film and a reactive thin film. The Sb base thin film is formed by depositing a Sb base material containing at least 95 at % of Sb to a thickness of 70-150 Å. The reactive thin film is formed of a material which forms a phase change recording material when mixed with Sb. The reactive thin film is typically formed of an In—Ag—Te or Ge—Te material. Stable write/read characteristics are accomplished at the first overwriting, initializing operation is eliminated, and rewriting is impossible at the same linear velocity as recording.

Abstract: An optical information recording disc of DVD (Digital Video Disc) type having an information recordable layer(s) between a pair of substrates (i.e., sandwich structure) shows an improved mechanical strength and an improved storage stability when the substrate has an exposed area on its outer peripheral edge and the exposed area is placed in contact with a resin layer, or the substrate has an enlarged surface area (preferably it is exposed) on its outer peripheral edge and the enlarged surface area is placed in contact with a resin layer. An apparatus for preparing an optical information recording disc of DVD type having an improved mechanical strength and an improved storage stability is further disclosed.

Abstract: The object is to hold the recording, reproduction and rewrite characteristics better than in the prior art. An information recording medium comprises an information recording thin film as a recording layer formed on a substrate for recording and/or reproducing information by the change in the atomic arrangement caused by the radiation of light. The medium further comprises at least one protective layer. The protective layer and the recording layer are formed in that order from the light incidence side, followed by forming at least one absorption control layer, thereby exhibiting a superior rewrite characteristic.

Abstract: A high-density optical disk comprises a transparent substrate having a guide groove having a depth of 100 to 200 nm, width of 0.2 to 0.4 &mgr;m arranged with a track pitch of 0.7 to 1.0 &mgr;m. A recording layer is made of an organic pigment exhibiting a specific main weight reduction in a thermogravimetric analysis and a specific exothermic peak in a differential thermal analysis.

Abstract: A perishable media information storage mechanism, including a substrate, a data layer for recording data thereon the information storage mechanism, a reflective layer, and a protective lacquer coating. The data layer includes a material responsive to at least one predetermined data elimination factor and includes one of a decayable dye material, a liquid crystal material, a photosensitive material or a plurality of magnetoresistive memory cells. The data layer is characterized as recording data and eliminating access to data in response to at least one of a predetermined use or time factor. In addition, included is a method for fabricating a perishable media information storage mechanism including the steps of providing a substrate, forming a data layer on a surface of the substrate, forming a reflective layer on an uppermost surface of the data layer, and forming a protective coating on an uppermost surface of the reflective layer.

Abstract: An optical information recording medium provided with an information layer comprising at least Te, O and M atoms (wherein the M is at least one element selected from a metallic element, a metalloid element or a semiconductor element, most preferably Pd). The information layer comprises the O atoms in 40 atom %-60 atom %, the M atoms in 2 atom %-25 atom % and the Te atoms in 15 atom %-58 atom %, thus obtaining a preferable recording property having a high C/N ratio and a small jitter in a wide power margin in recording and reproducing information having a small b/d ratio (a ratio of a recording bit length b for a spot diameter d).

Abstract: A structure of an optical recording medium that mainly includes a first dielectric layer, a dye layer, a second dielectric layer, and a reflective layer formed on a substrate in sequence, and a method for fabricating an optical recording medium of the foregoing structure. The additional dielectric layers of the optical recording medium, instead of a quencher used in a conventional optical recording medium, increase the lifetime of a dye layer and reduce the fabrication cost. Furthermore, the additional dielectric layers are capable of isolating the dye layer from oxygen and moisture to enhance the lightfastness of the dye layer.

Abstract: An optical recording medium has a substrate and a recording layer formed thereon, the recording layer containing at least one compound represented by formula (I): wherein M, R1 to R4 and X1 to X4 are as specified in the specification; and in addition, information can be recorded in the above-mentioned optical recording medium by applying a laser beam in a wavelength range of 630 to 720 nm thereto.

Abstract: A recording medium includes a transparent substrate; a crystalline phase-change layer provided over the transparent substrate; a dielectric layer provided over the phase-change layer; a metallic reflector layer provided over the dielectric layer; and the crystalline phase-change layer having a thickness and phase-change material selected so that data can be recorded in it on a first write, but on second or subsequent writes the written data results in at least a 50% increase in data jitter.

Abstract: A bonded optical disk comprising first and second transparent substrates bonded with a light-permeable, pressure sensitive adhesive layer and at least one information recording layer wherein the pressure sensitive adhesive layer has been formed from a pressure sensitive adhesive precursor, having a viscosity of 10 to 5000 cps and being applied onto at least one of the first substrate and the second substrate by radiation curing and has a gel fraction of not less than 50% and a storage modulus of 1.0×104 to 1.0×107 dyn/cm2 at 25° C., or in place of the pressure sensitive adhesive layer, an adhesive layer derived from a radiation curable adhesive precursor having a viscosity of 500 to 10000 cps, and the adhesive precursor is subjected to a higher pressure than an atmospheric pressure, prior to being irradiated, as well as a method and an apparatus for producing a bonded optical disk.

Abstract: A multi-layered optical disc having superior recording/reproducing characteristics, in which the recording density in three-dimensional direction can be increased to increase the recording capacity, and its manufacturing method. A multi-layered optical disc 1 has a light reflecting layer 3, a second information recording layer 4, a transparent layer 5, a first information recording layer 6 and a light-transmitting layer 7 sequentially formed on a major surface 2a of its substrate 2. The laser light is illuminated from the light-transmitting layer 7 of the multi-layered optical disc 1 to record and/or reproduce information signals.

Abstract: A magneto-optical recording medium comprises, on a substrate, a reflective layer, a first dielectric layer, a recording layer, and a second dielectric layer successively in this order, for being irradiated with a recording or reproducing light beam coming from a side of the second dielectric layer. A diamond-like carbon layer as a self-lubricating layer is formed on the second dielectric layer. An optical head comprises a floating type slider installed with a solid immersion lens. A protective film having a self-lubricating property may be also formed on a bottom surface of the slider opposing to the optical recording medium. Even when the floating position of the optical head is varied, and the optical head contacts with the surface of the optical recording medium, then the sliding scratch scarcely occurs, because the optical head smoothly glides on the recording medium surface. A lubricating layer may be further formed on the self-lubricating layer.

Abstract: An optical information recording medium provided on a substrate thereof with a recording layer comprising a dye-containing layer, wherein the recording layer further comprises an organometallic dye compound containing a metal or a metallic ion, which is characterized in that an absorption spectrum curve of the recording organic dye is intersected with an absorption spectrum curve of the organometallic dye compound, and that the organometallic dye compound exhibits a maximum absorption wavelength on a longer wavelength side in relative to a maximum absorption wavelength of the recording organic dye.

Abstract: A disc recording medium that is capable of being rotated at a high speed to improve an information transfer rate. The recording medium has a residual stress acting as a tensile force. An annular reinforcing member having a temperature coefficient different from the disc and adapted to be bonded to the disc is used in the recording medium.

Abstract: The present invention provides a new category of information storage material, nonstoichiometric metal-organic complex Ag1−&bgr;(TCNQ), which is particularly suitable for digital video disc (DVD-R) operated by blue laser (wavelength 450 nm) or red laser (wavelength 650 nm), wherein, Ag is silver, TCNQ is tetracyano-p-quinodimethane C12H4N4, &bgr; is a parameter chosen by its performance and &bgr;≦0.4. The material can produce apparent absorption change under the incidence of the above-mentioned two different lasers. When used as optical recording medium, it has the advantages of high signal-to-noise ratio, fast response and low cost. The actual number of write-erase cycles can be larger than 20. Therefore, its performance is better than a conventional DVD-R.

Abstract: Optical disc, e.g., CD-R, DVD, DVD-R, comprising a polymer substrate and a radiation-cured coating provided by curing a radiation-curable coating composition having a pH greater than or equal to 3 and comprising at least one acrylate monomer, and advantageously diacrylate monomers and oligomers and monomers having acrylate functionalities of from 1 to at least 3, wherein the optical disc exhibits jitter of no greater than about 35 ns after being subjected to an environment having a temperature of at least 80° C. and a relative humidity of at least 85% for a period of at least 96 hours.

Abstract: A phase-change optical disc has a recording layer formed from a phase-change material switchable between a crystalline state and an amorphous state. The recording layer is illuminated signal-wise by a light is focused onto the recording layer to change the phase thereof from crystalline to amorphous, to thereby write an information signal onto the recording layer. The phase-change material contains a GeSbTe alloy. The recording layer is formed by sputtering in an Ar gas atmosphere containing at least either N2 or O2 gas or both. The optical recording medium exhibits improved durability after repeated recording and maintains a stable and good write/read characteristic even after repeated cycles of signal recording.

Abstract: The invention relates to methods for making mold tools. More particularly, the mold tools are used for molding a resin substrate which has fine pits, i.e., concavities and protuberances. The invention also pertains to a method for manufacturing a resin substrate. Such resin substrates may be used as an optical disk, a magnetic disk, a hard disk, etc., for recording data. According to a preferred embodiment of the invention, a first metallic (Ni) mold tool (father) is made which is a duplicate of a master substrate, then a resin mold tool (mother) is made which is a duplicate of the first metallic mold tool and finally a second metallic (Ni) mold tool (son) is made which is a duplicate of the resin mold tool. Both the father and son may be referred to “as a stamper”.

Abstract: A phase-changing optical disk solving the problem of difference in recording sensitivity between the land and groove without complexing configuration of the recording device or optical disk production scheme. The present invention provides a phase-changing optical disk including a substrate 11, provided with guiding grooves 17 to form the lands and grooves as the recording tracks, which are laminated with a first dielectric layer 12, second dielectric layer 13, recording layer 14, third dielectric layer 15 and reflection layer 16 in this order, wherein the material for the first dielectric layer 12 has a higher thermal conductivity than that for the second dielectric layer 13, and thickness of the second dielectric layer 13 is smaller than depth ds of the guiding groove 17.

Abstract: An information recording medium composed of 1) a transparent support, 2) a recording layer which is composed of an organic dye having an oxidation potential in terms of Po and an organic oxidizing agent having a reduction potential in terms of Pr in which the oxidation potential and the reduction potential satisfy the condition of 0.4V<Po−Pr<1.0V, and 3) a light-reflecting layer on the recording layer shows improved light-resistance and endurance as well as good recording and reproducing characteristics.

Abstract: An optical recording material including a substrate and a recording layer which is formed overlying the substrate, wherein the recording layer includes an azo chelate compound including an azo compound and at least one of a metal and a metal salt, and wherein the azo compound has the following formula (1):

Abstract: A recording medium comprising a hydrophilic film formed on a substrate, recording domains formed directly on the hydrophilic film so as to form a predetermined pattern, each recording domain being made of an organic dye molecule and having a size of 50 nm or less, and an isolation region surrounding the recording domains, the isolation region being made of an organic molecular film.

Abstract: An optical recording medium has deposited on a substrate a recording layer incorporating therein a cyanine dye, preferably an indoline dye, and optionally incorporating therein an autoxidizable compound or a thermoplastic resin and/or a singlet oxygen quencher.

Abstract: An optical recording medium having sufficient repetition recording durability and its manufacturing method. A first dielectric layer 2 is layered on a major surface 1a of a substrate 1, and a recording layer 5, made up of two layers, namely a first thin film 3 and a second thin film 4 having different crystallization start temperatures, is formed on the first dielectric layer 2. A second dielectric layer 6, a reflective layer 7 and a protective layer 8 are then sequentially formed. One of the first thin film 3 or the second thin film 4 preferably contains nitrogen or oxygen. It is more desirable that the first thin film 3 lying towards the substrate 1 contains nitrogen or oxygen. The difference between the crystallization start temperature of the first thin film 3 and that of the second thin film 4 be 20° C. or more. It is more desirable that the crystallization start temperature of the first thin film 3 lying towards the substrate 1 be higher by 20° C. or more than that of the second thin film 4.

Abstract: A rewritable single-sided double layer optical information medium having a first recording stack with a phase change recording layer sandwiched between two dielectric layers. The recording stack is sufficiently transmissive to ensure proper reading/writing of the second recording stack. For this purpose, the recording stack includes a thin metal layer and a further dielectric layer. The laser beam can be focused on the first recording stack or on the second recording stack, thus doubling the storage capacity of the recording medium.

Abstract: An optical disk comprising a recording layer and a super-resolution film disposed on the reproduction-beam incident side of the recording layer, wherein the super-resolution film is formed of a fine particle-dispersed film comprising a matrix and semiconductor fine particles dispersed in the matrix or formed of a semiconductor continuous film, and wherein content of a matrix material or a contamination mixed in the semiconductor fine particles or the semiconductor continuous film is not more than 20 at %.

Abstract: Disclosed is an apparatus for formation of high quality plastic sheet in a continuous fashion. Also disclosed are a variety of optical and electronic display applications for high quality plastic sheet produced in a continuous fashion.

Abstract: The invention is a method of plating a nonmetallic substrate comprising the steps of depositing an adhesion enhancing film on the substrate, treating the adhesion enhancing film to make the film catalytic, and forming an outer coating and passivating plate on the adhesion enhancing film. The resulting plated, nonmetallic substrates may comprise any number of materials used as an inner substrate such as compounds of oxide, nitride, phosphide, carbide, glass, ceramic, and mixtures thereof. In use, the resulting substrate may find application in any number of data storage and retrieval application.

Abstract: A rewritable optical recording disk has a substrate with an increased thickness that is greater than or equal to approximately 1.5 mm and less than or equal to approximately 2.5 mm. The increased thickness of the substrate enhances the flatness of the recording disk relative to a recording plane. In particular, the increased thickness reduces process-induced surface variations such as warpage and tilt, and provides the disk with increased stiffness to resist deflection during use. The enhanced flatness enables data to be recorded on the disk in a consistent manner with greater spatial densities using techniques such as near-field, air-incident recording. The resulting disk thereby yields greater spatial density and data storage capacity.

Abstract: An optical information recording medium includes a first dielectric protective layer, a recording layer provided on the first dielectric protective layer, including a material represented by a chemical formula of Ag&agr;In&bgr;Sb&ggr;Te&dgr;, wherein &agr;, &bgr;, &ggr; and &dgr; respectively represent an atomic percent of Ag, an atomic percent of In, an atomic percent of Sb, and an atomic percent of Te, and satisfy the conditions of: 1≦&agr;<10, 1<&bgr;≦20, 35≦&ggr;≦70, 20≦&dgr;≦35, &agr;+&bgr;+&ggr;+&dgr;=100, 4&bgr;−&dgr;≦0, &ggr;−2&dgr;≧0, and &ggr;−8&agr;≧0, a second dielectric protective layer provided on the recording layer, and a light reflection and heat dissipation layer provided on the second dielectric protective layer.

Abstract: An optical information recording medium comprising a substrate, a recording layer, a protective layer containing a sulfur atom, an intermediate layer in contact with the protective layer and a reflective layer containing silver as the main component in contact with the intermediate layer, wherein the intermediate layer comprises an element which does not form a compound with silver, the element contained in the intermediate layer having a solid solubility of at most 5 atomic % to silver and silver having a solid solubility of at most 5 atomic % to the element contained in the intermediate layer, on the side in contact with the reflective layer, and the intermediate layer comprises an element less reactive to sulfur or its sulfide comprises chemically stable elements, on the side in contact with the protective layer.

Abstract: By keeping the imaginary number portion k of the complex index of refraction of the film of the light absorbing layer 3, the mean film thickness dav of the light absorbing layer 3, and the absorbency A related thereto within an appropriate range, the present invention provides an optical information recording medium with good recording sensitivity and playback properties, which makes possible high speed recording by increasing the sensitivity to the recording beam and stable recording with sufficient reflectivity, and which can reduce jitter. In the present invention, 0.13≦A≦0.21 where A (Abs) is the absorbency of the light absorbing layer at the wavelength of the recording beam; and 6.0≦k.dav≦12.0 where k is the imaginary number portion of the complex index of refraction of the film in the light absorbing layer and dav (nm) is the mean film thickness of the light absorbing layer, at the wavelength of the recording beam.

Abstract: An optical recording medium is provided in which a recording layer contains a salt-forming dye between an ion of an azo metal complex of the following formula (I) and an ion of a cyanine dye of the following formula (II), having a complex index of refraction in the wavelength region of recording light and/or reading light whose imaginary part k is up to 0.20, or at least one of azo oxovanadium metal complexes having an azo compound of the following formula (III) as a ligand and metal complexes having azo compounds of the following formulae (IV) and (V) as a ligand. Recording and reading can be carried out at a conventional wavelength or a short wavelength of about 630-690 nm or both.

Abstract: There is disclosed a recordable optical element that has a substrate and on the surface of the substrate, a recording layer and a light reflecting layer. The recording layer has a material with the formula TeaGebCcHdOe wherein a, b, c, d, and e are atomic percents and (c+d)>40, d>10, a>5, b>5, and e≧0 such that a+b+c+d+e=100; and the reflecting layer and the recording layer being selected such that the element Rmax or Rmin (element reflectivity) is about or greater than 70% at about 780 nm.

Abstract: Focusing and tracking can be stably performed using an optical information recording medium in which a high reflectivity and a large reflective change amount can be attained, and the reflectivity change amounts of the lands and grooves are set equal to each other by forming, between a transparent substrate and a first protective layer, an interference layer containing at least one material selected from the group consisting of Au, Ag, Cu, Si, and Ge. Even if information is recorded on the lands and the grooves, it can be recorded/reproduced without any crosstalk from an adjacent track.

Abstract: An optical information recording medium includes a first substrate; at least a first dielectric layer and a recording layer for signal recording provided on a surface of the first substrate; and a second substrate. The first substrate and the second substrate are assembled together in the state of being warped in planar symmetry and flattened. The first dielectric layer and the recording layer is interposed between the first substrate and the second substrate.

Abstract: An optical recording medium includes a substrate having light transmission properties, which has laminated on a main surface thereof a recording layer and a metal reflection layer. The recording layer is made of a compounded organic dye thin film which contains a specified aromatic amine compound in an amount of not smaller than 3% by weight but below 30% by weight based on the total weight of the recording layer and a specified asymmetric cyanine dye having absorption to light having a wavelength of 500 to 700 nm in an amount of not smaller than 30% by weight but below 97% by weight based on the total weight of the recording layer. The recording layer is applicable to a short-wavelength (500 to 700 nm) semiconductor laser so that an optical recording medium according to the DVD-ROM standards having excellent stability of the dye film and allowing a decrease in jitter component upon high density recording.