Abstract: An optical recording medium is equipped with a light transmitting layer to have visual effects. Patterns with different visual effects can be printed on the upper and low surfaces of the light transmitting layer. Alternatively, visual effects can be presented by directing light out of an upper light grating from a low printing layer. The optical recording medium can not only record information but also present visual effects.

Abstract: A first substrate is formed to include a surface on which a first record layer is formed, and which includes an inner circumferential portion on which a ring-shaped member is provided. Ultraviolet curing resin is dropped onto part of the surface which is located inward of the ring-shaped member, and the first substrate is then spun to coat the first record layer with the ultraviolet curing resin. Furthermore, a second substrate is formed to include a surface on which a second record layer is formed, and the second substrate is spun to coat the second record layer with ultraviolet curing resin. Then, the first and second record layers are made to face each other, and the first and second substrates are bonded to each other by the ultraviolet curing resin.

Abstract: An optical effect disc, has a transparent substrate and a surface optical structure, and an optical recording media combining the optical effect disc. The surface optical structure may be a computer-generated hologram optical structure or a micro-lens array structure for showing the effect of brightening or peep prevention, or a diffraction gating structure for achieving a three-dimensional visual effect. The optical effect disc or the optical recording media may include an image forming layer for forming an image to be shown by the optical effect disc with corresponding visual effect. The optical effect disc or the optical recording media may include an adhesive layer for attaching the optical effect disc to the optical recording media.

Abstract: A recording layer for optical information recording medium excellent in recording property, an optical information recording medium including the recording layer and a sputtering target useful for formation of the recording layer are provided. A recording layer for an optical information recording medium on which recording is performed through irradiation with laser light, the recording layer including an oxide of a metal of which an absolute value of the standard free energy of oxide formation per 1 mol of oxygen is larger than that of Pd (hereinafter referred to metal X) and a Pd oxide, wherein the Pd oxide includes a Pd monoxide and a Pd dioxide, and wherein a ratio of the Pd atom to a total of the metal X atom and the Pd atom which are contained in the recording layer is 4 to 85 atomic %.

Abstract: An optical storage medium is disclosed that includes an optical disc having layers of graphene on one or both sides of the disc to provide wear protection against scratches and mechanical abrasion. Grahpene is a hard material that is 97.7% optically transparent. Thus, layers of graphene at or near the exterior sides of an optical disc provide wear protection to the optical media from mechanical abrasion and scratches while allowing laser light to pass through the graphene layers to read or write to the optical media.

Abstract: An optical information recording medium including three or more information layers, wherein at least one information layer provided on the light incident side is an information layer which enables information to be overwritten and includes a recording film, a transmittance adjusting film of a dielectric containing Bi, Ti and O, and an isolation film in this order from a light incident side; and the isolation film is provided between and adjacent to the transmittance adjusting film and an intermediate separation layer which separate the information layer from another information layer on the side opposite to the light incident side; and the isolation film has an optical constant at a wavelength of 405 nm such that a refractive index is 1.8 or less and an extinction coefficient is 0.05 or less. This information recording medium prevents the repeated overwriting characteristics in a sever environment from being deteriorated.

Abstract: A recording medium includes a substrate having a label-side surface on one side and a recording layer for recording and reproducing information on the other side. The label-side surface of the substrate has a mirror surface portion and a rough surface portion, a step having a step height of 10 ?m or less is formed between the mirror surface portion and the rough surface portion, and an average roughness of the rough surface portion is between 10 ?m and 2 ?m, inclusive. Visible information is formed on the label-side surface by using the mirror surface portion and the rough surface portion.

Abstract: The method of manufacturing an optical information recording medium includes a first resin applying step of applying a first photo-curing resin to one surface of a first substrate, a first resin curing step of laminating a first stamper having an uneven surface on the first photo-curing resin, and irradiating ultraviolet rays via the first stamper to cure the first photo-curing resin, a second resin applying step of applying a second photo-curing resin to the other surface of the first substrate, a second resin curing step of laminating a second stamper having an uneven surface on the second photo-curing resin, and irradiating ultraviolet rays via the first second to cure the second photo-curing resin, a first stamper peeling step of peeling the second stamper from the second photo-curing resin, and a first recording layer laminating step of laminating a first recording layer on an exposed surface of the second photo-curing resin.

Abstract: Disclosed is a digital information media having an adhesion promotion layer supported on a dummy (L1) substrate that enables secure bonding of the L1 layer, directly or indirectly, to the rest of the stack of layers in the digital information media. Certain materials including metals, metal alloys, or metalloids enhance adhesion between the adhesive layer and the L1. By applying an adhesion promotion layer of such materials on an inner surface of the L1, the bond between the adhesive and the adhesion promotion layer improves bonding and reduces a tendency for the L1 to delaminate from the rest of the stack. The tendency for breakage of the media at the juncture between the adhesion promotion layer and the adhesive is reduced, and incursion of moisture or oxygen through the interface between the adhesion promotion layer and the adhesive is inhibited.

Abstract: Optical information media containing an ultraviolet protection layer are described. The protection layer will reduce or eliminate damage to the media's data layer and substrate.

Abstract: The present invention provides an optical recording medium realizing reduced manufacturing cost of the optical recording medium. An optical recording medium 10 includes: a substrate 1; a recording layer 2 formed on the substrate 1, containing In, Sn, Pd, and oxygen, and containing oxygen atoms more than stoichiometric composition of the case where the In and the Sn are completely oxidized; and a light transmission layer 3 formed on the recording layer 2.

Abstract: An optical disc is described that bears, on one surface, a plurality of color-forming layers that can form a multicolored image when heated in contact with a thermal print head. The color-forming composition comprises color-forming layers and thermally-insulating spacers and is designed such that warping of the optical disc in conditions of changing temperature and humidity is minimized. The compliance of the color-forming composition is such that intimate contact between the thermal print head and the printable surface of the disc can be maintained as one is translated relative to the other. Methods for assembling such an optical disc are provided.

Abstract: An optical information recording medium including a substrate; two or more recording layers provided on the substrate; and a protective layer provided on the recording layers, wherein the surface of one of the side of the substrate and the protective layer is a light irradiation plane, at least one of the recording layers other than the recording layer at the deepest position from the light irradiation plane includes W, Pd, and Cu oxides as the principal components, and the ratio of W, Pd, and Cu that are respectively included in the W, Pd, and Cu oxides satisfies the relationship 0.17?x1 (where x1=a/(b+0.8c), where a: atomic ratio of W with respect to the total of W, Pd, and Cu, b: atomic ratio of Pd with respect to the total of W, Pd, and Cu, and c: atomic ratio of Cu with respect to the total of W, Pd, and Cu).

Abstract: An optical information recording medium including a recording layer that can record a large amount of information is manufactured using a simple system. A single recording layer is formed by bonding two optically transparent substrates on which the first photosensitive polymer and the second photosensitive polymer are spread such that the layers of the photosensitive polymers face each other. Furthermore, since the absorptivity of light in the recording layer increases as the focal point of light for information recording moves in a depth direction, information can be recorded without decreasing the recording transfer rate of the information.

Abstract: The present invention is related to an optical recording media having a printable layer with high specular gloss. The optical recording media comprises a first ink-absorbing layer formed on an outermost layer at an opposite side of a recording/reading surface of the optical recording media; and a second ink-absorbing layer formed on an inner side of the first ink-absorbing layer. A surface of said first ink-absorbing layer is printed with inks of colors of cyan, magenta, yellow, black to have an average specular gloss value at 20 degree angle greater than or equal to 30GU, an average specular gloss value at 60 degree angle of the four colored inks greater than or equal to 70GU, and an average specular value at 85 degree angle of the four colored inks greater than or equal to 88GU.

Abstract: A sheet (1) for manufacturing an optical disc which includes a pressure-sensitive adhesive layer (11), having a peak temperature of a loss tangent not higher than ?10° C. and a polar component (?Ps) of the surface energy not smaller than 2.0 mJ/m2, and a protective sheet (12), is laminated on a data recording layer (3) (a laminate formed of a reflecting layer (31), a dielectric layer (32), a phase change layer (33) and a dielectric layer (32?)) that is formed on an optical disc substrate (2). The sheet for manufacturing an optical disk (1) allows obtaining an optical recording medium that is provided with the pressure-sensitive adhesive layer (11) that has high adhesion to the data recording layer (3) and does not peel readily off adjacent layers.

Abstract: A base element for a fixing belt are provided. The base element includes a sheet which is made of a heat resistant resin and has opposite end portions joined in an endless state. A conductive film layer of a thickness of 3 to 15 ?m is provided over two third or more area of an inner surface of the endless belt.

Abstract: There are provided a fine structural body capable of manifesting an unprecedented property; a manufacturing method thereof; and a magnetic memory, a charge storage memory and an optical information recording medium employing such fine structural body. Unlike conventional bulk bodies phase-transited between nonmagnetic semiconductors and paramagnetic metals around about 460K, there can be provided a fine structural body 1 comprised of Ti3O5, but capable of manifesting an unprecedented property in which a paramagnetic metal property thereof is consistently maintained in all temperature ranges without undergoing phase transition to a nonmagnetic semiconductor.

Abstract: A multilayer-type optical recording medium having a translucent recording/reproducing functional layer containing a first protective layer, a second protective layer, a recording layer, a third protective layer, a reflective layer and a fourth protective layer in this order relative to incident laser light. The second protective layer and the fourth protective layer are made of the same kind of material. The refractive index of the second protective layer is higher by at least 0.3 than the refractive index of the first protective layer. When the film thickness of the second protective layer is set as D2, the film thickness of the fourth protective layer is set as D4, and the reflectivity before recording when the laser light is focused on the recording layer is set as R, the derivatives d(R)/d(D2) and d(R)/d(D4) have opposite signs from each other.

Abstract: An optical information recording medium comprises a plurality of recording layers, and intermediate layers provided between the plurality of recording layers. The optical information recording medium has a recess for use in tracking, in a layer which is provided in a position farther, than the plurality of recording layers, from a light-incident side on which a beam emitted for recording/reading enters. A depth D of the recess is ?/4n where ? is a wavelength of the beam emitted for recording/reading, n is a refractive index of a layer with which the recess is filled.

Abstract: Disclosed is a read-only optical information recording medium which comprises a reflective film having a reflectance suitable for use as a reflective film for an optical information recording medium (e.g., BD-ROM) and having excellent reproduction stability, and which utilizes a blue laser beam. Specifically disclosed is a read-only optical information recording medium comprising a reflective film, wherein the reflective film comprises an Al-based alloy containing at least one element selected from Si and Ge in an amount of 5 to 40 at. %.

Abstract: A recording layer excellent in recording property, an optical information recording medium including the recording layer, and a sputtering target for producing the recording layer. The recording layer on which recording is performed through irradiation with a laser light, contains: a Pd oxide; a Ag oxide; and an oxide of a metal X of having an absolute value of the standard free energy of oxide formation per 1 mol of oxygen that is larger than an oxide of Pd and Ag, wherein a ratio of Pd atom to a total (metal X atom+Pd atom+Ag atom) is from 10 to 60 atomic %, a ratio of Ag atom to the total is from 5 to 45 atomic %, and a ratio of Pd atom and the Ag atom to the total is 75 atomic % or less.

Abstract: A data storage device includes a substrate layer, made of a moldable non-photopolymer plastic substrate and having a servo layer, adjoined to a stacked film structure that is constructed of multiple functional films, having data layers, with spacer film(s) disposed between each of the functional films. Methods of manufacturing the data storage device include using a roll-to-roll system to adhere thin spacer film extrusions between the multiple functional film extrusions so as to construct the stacked film structure. An additional method uses an application of functional film coating to thin spacer films and a roll-to-roll system.

Abstract: Provided is a manufacturing method of an optical information storage medium irradiated with laser beams to optically record or reproduce information. A method of manufacturing an optical information storage medium according to the present invention includes forming asperity patterns for guiding laser beams on both sides of a second substrate 12, forming information recording layers 41 and 42 in the asperity patterns, bonding a first substrate 11 to a surface where one information storage layer 41 is formed in the second substrate 12 with an ultraviolet curable resin 22 formed therebetween, and bonding a third substrate 13 to a surface where another information storage layer 42 is formed in the second substrate 12 with an ultraviolet curable resin 22 formed therebetween.

Abstract: Shape-wise thicknesses of a cover layer and first through (N?1)th intermediate layers of an optical recording medium having refractive indexes nr1, nr2 are converted into thicknesses t1, t2 of the respective layers having a predetermined refractive index which makes a divergent amount equal to a divergent amount of a light beam resulting from the thicknesses tr1, tr2, a difference DFF between the sum of a thickness “ti” through a thickness “tj”, and the sum of a thickness “tk” through a thickness “tm” is set to 1 ?m or more (where i, j, k, and m are each any positive integer satisfying i?j<k?m?N), and the thicknesses t1, t2 are calculated by products of a function f(n) expressed by the following formula (1), and the thicknesses tr1, tr2: f(n)=?1.088n3+6.1027n2?12.042n+9.1007??(1) in the formula (1), n=nr1, nr2, . . . , and nrN.

Abstract: The invention relates to sputter targets and methods for depositing a layer from a sputter target. The method preferably includes the steps of: placing a sputter target in a vacuum chamber; placing a substrate having a substrate surface in the vacuum chamber; reducing the pressure in the vacuum chamber to about 100 Torr or less; removing atoms from the surface of the sputter target white the sputter target is in the vacuum chamber (e.g., using a magnetic field and/or an electric field). The deposited layer preferably includes a molybdenum containing alloy including about 50 atomic percent or more molybdenum, 0.1 to 45 atomic percent titanium; and 0.1 to 40 atomic percent of a third metal element that is tantalum or chromium.

Abstract: A production method for an optical disc master includes the steps of: preparing a substrate; forming an intermediate layer having a predetermined thickness on the substrate; forming an inorganic resist layer having a thickness on the intermediate layer, a ratio of the thickness of the intermediate layer to the thickness of the inorganic resist layer being in a range between 0.8:1 and 1.5:1; irradiating the inorganic resist layer with a laser beam to selectively expose the inorganic resist layer; and developing the selectively exposed inorganic resist layer.

Abstract: Simple design of a multilayer optical recording medium is achieved while suppressing interlayer crosstalk and confocal crosstalk in the multilayer optical recording medium. Simple recording and reading control by a recording and reading unit is also achieved. The multilayer optical recording medium includes at least three or more recording and reading layers deposited one above the other with intermediate layers interposed therebetween, and information can be read by light irradiation from the layers. The intermediate layers have film thicknesses of two types or less, and all the recording and reading layers except the recording and reading layer farthest from a light incident surface have substantially the same optical constant.

Abstract: The multilayer optical recording medium with six or more recording and reading layers disposed one above the other has at least two or more recording and reading layer groups. The recording and reading layer groups each include a plurality of recording and reading layers successively disposed one above the other. The reflectance of each of the recording and reading layers in a stacked state decreases in the order from a front side near a light incident surface toward a back side far from the light incident surface. A recording and reading layer nearest the front side among the recording and reading layers in the recording and reading layer group nearer the back side has a reflectance in a stacked state higher than that of a recording and reading layer nearest the back side among the recording and reading layers in the recording and reading layer group nearer the front side.

Abstract: The multilayer optical recording medium with at least four or more recording and reading layers disposed one above the other has at least two or more recording and reading layer groups each including the recording and reading layers successively disposed one above the other. In adjacent recording and reading layer groups with an intermediate layer interposed therebetween, a recording and reading layer nearest a front side in the recording and reading layer group nearer a back side is higher than the higher value of the reflectances in a stacked state of two recording and reading layers nearest the back side in the recording and reading layer group nearer the front side.

Abstract: A recording wavelength generator selects control parameters of a recording pulse sequence, based on combinations of mark length, a first space length of a first space immediately before the mark, and a second space length of a second space immediately after the mark. A laser drive circuit records the marks by the recording pulse sequence. The first and second space lengths are classified into m and n types, respectively. An absolute value of a difference between two predetermined control parameters from among (m×n) control parameters selected during recording on a second information layer located on an incidence side of the laser beam with respect to a predetermined first information layer from among N information layers is equal to or greater than an absolute value of a difference between two predetermined control parameters from among the (m×n) control parameters selected during recording on the first information layer.

Abstract: An optical article comprising a first file encoded on the optical article comprising data structure information; a second file encoded on the optical article comprising a backup of the first file; wherein at least one of the first file or the second file must be fully readable for the player to read the data on the optical article; and a mark disposed on at least a portion of the optical article where the first file is encoded and at least a portion of the optical article where the second file is encoded; wherein the mark comprises an optical state change material; wherein the optical state change material undergoes a change in its optical state when exposed to an activation signal selected from one or more of a laser, thermal energy, infrared rays, X-rays, gamma rays, microwaves, visible light, ultraviolet light, ultrasound waves, radio frequency waves, electrical energy, chemical energy, magnetic energy, and mechanical energy; wherein the optical article is transformed from a pre-activated state to an activ

Abstract: A Flexible VCD Having Domed Center and Flat Central Bottom Ring and Method of Making Thereof is disclosed. The disc will has a flat data storage section of its substrate that is less than 0.7 millimeters thick, while the central region of the disc is defined by a dome structure adjacent to the spindle aperture that is of standard digital disc thickness. The disc is thin enough such that its substrate is flexible. The dome structure is shaped to provide the widest compatibility with player/recorders, as well as with disc printing systems. Disc versions are available that provide conical dome structures, as well as slivered dome structures of both conical and rectangular cross-section, and a combined design having a plurality of raised protrusions on the top surface of the disc, and a flat central ring protruding from the bottom surface of the disc. The method for manufacturing the discs simply requires the replacement of the conventional stamper holder with a stamper holding having a non-flat face.

Abstract: A multilayer optical recording medium in which, as a recording layer is located farther from a surface of incidence of a light beam for reading, the amount of light that reaches the surface of incidence after being reflected off the recording layer is smaller.

Abstract: A method for manufacturing an information recording medium including N information layers, (N?1) intermediate layers interposed between the information layers and a protective layer laminated on the Nth information layer placed on a substrate formed with a first reference point, including: forming the information layer on the substrate; repeating (N?1) times a process of applying radiation curable resin on the information layer, a process of affixing a transfer stamper formed with a second reference point to the radiation curable resin, a process of curing the radiation curable resin by irradiation, and a process of forming the intermediate layer by peeling the transfer stamper at an interface with the radiation curable resin, in order to form the (N?1) information layers and the (N?1) intermediate layers and thereafter form the Nth information layer; and forming the protective layer on the Nth information layer, wherein in the process of affixing the transfer stamper to the radiation curable resin, the trans

Abstract: An optical recording medium includes a support substrate, and a semi-transmissive recording layer including a first dielectric layer, a semi-transmissive semi-reflective layer, a second dielectric layer, a phase-change recording material layer, and a third dielectric layer which are laminated in that order from the support substrate side. The semi-transmissive semi-reflective layer is composed of silver, and the first dielectric layer includes a composite oxide layer using niobium oxide.

Abstract: Provided is a read-only optical information recording medium (for instance, a dual-layer BD-ROM), which uses blue laser and is provided with a reflecting film which has sufficiently high reflectivity while ensuring optical transparency required in manufacture, has excellent reproduction stability when used for an optical information recording medium and has excellent durability. The read-only optical information recording medium includes a structure wherein a plurality of laminated layers of the reflecting film and the optical transparent layer are formed on a substrate, and reproduces information by means of blue laser. The reflecting film closest to the substrate among the reflecting films is substantially composed of an Al-based alloy containing 0.5-3.0 atm % of Ti, and has a film thickness of 10 nm or more but not more than 30 nm.

Abstract: An optical recording medium includes an inorganic recording layer, a first protective layer provided on at least one surface of the inorganic recording layer and containing indium oxide, and a second protective layer provided so as to be adjacent to the first protective layer and containing titanium oxide, zirconium oxide, or tin oxide.

Abstract: An optical recording medium includes a support substrate and a semi-transmissive recording layer. The semi-transmissive recording layer includes a first dielectric layer, a semi-transmissive semi-reflective layer, a second dielectric layer, a phase change recording material layer, and a third dielectric layer that are sequentially stacked in that order on the support substrate. The semi-transmissive semi-reflective layer contains silver. The second dielectric layer has a stack structure including a lower layer disposed at the interface on the semi-transmissive semi-reflective layer side and an upper layer disposed on the phase change recording material layer side of the lower layer. The lower layer is composed of indium oxide or a composite oxide of indium oxide and tin oxide. The upper layer is composed of tantalum oxide, gallium oxide, zirconium oxide, or niobium oxide.

Abstract: An optical media such as an optical tape includes a substrate, a pre-format layer on one side of the substrate, and a back side coating. The back side coating is optically transparent and is electrically conductive. One of the substrate and the pre-format layer is between the back side coating and the other one of the substrate and the pre-format layer.

Abstract: The invention relates to three-dimensional optical memory devices and can be used in all areas of computing in which it is necessary to record large data files on compact carriers. The claimed device can also be used for recording, storing and playing back video and audio recordings. A multi-layer optical disc consists of a series of alternating layers of optically transparent materials arranged in groups that comprise a layer of a material with a refraction index n1 enclosed between a layer of a material with a refraction index n2, which satisfies the relationship n2<n1, and a layer of a material with a refraction index n3, which satisfies the relationship |n3-n1|<0.001, wherein the layer with the refraction index n3 contains a photosensitive compound that can exist in two forms characterized by different optical properties.

Abstract: A non-resonant two-photon absorption recording material containing at least (a) a non-resonant two-photon absorption compound, and (b) a recording component in which at least either a refractive index or fluorescence intensity changes, wherein the non-resonant two-photon absorption compound (a) is a compound having a structure represented by formula (1) as described.

Abstract: Shape-wise thicknesses of a cover layer and first through (N?1)th intermediate layers of an optical recording medium having refractive indexes nr1, nr2 are converted into thicknesses t1, t2 of the respective layers having a predetermined refractive index which makes a divergent amount equal to a divergent amount of a light beam resulting from the thicknesses tr1, tr2, a difference DFF between the sum of a thickness “ti” through a thickness “tj”, and the sum of a thickness “tk” through a thickness “tm” is set to 1 ?m or more (where i, j, k, and m are each any positive integer satisfying i?j<k?m?N), and the thicknesses t1, t2 are calculated by products of a function f(n) expressed by the following formula (1), and the thicknesses tr1, tr2: f(n)=?1.088n3+6.1027n2?12.042n+9.1007??(1) in the formula (1), n=nr1, nr2, . . . , and nrN.

Abstract: A multilayer optical recording medium including at least multiple information layers each having at least a phase change recording layer capable of recording information by laser irradiation and a reflection layer, wherein each information layer other than the innermost information layer as seen from a side of the laser irradiation has at least a lower protection layer, the phase change recording layer, an upper protection layer, the reflection layer and an optical transmission layer, the upper protection layer and the optical transmission layer in each information layer other than the innermost information layer as seen from the side of the laser irradiation are composed of an Sn oxide-containing material and a thickness of the upper protection layer in each information layer other than the innermost information layer as seen from the side of the laser irradiation is 2 nm to 15 nm is provided.

Abstract: An optical recording medium includes: an inorganic recording layer; and a protective layer including a composite oxide containing an indium oxide provided on at least one surface of the inorganic recording layer, wherein the composite oxide is represented by the formula [(In2O3)1-X(A)X], wherein A is cerium oxide or gallium oxide and X satisfies a range of 0.15?X?0.75.

Abstract: An optical disc having at least two metal-containing layers with different compositions and partially overlapping areal extents in the plane of the disc and method of forming the disc are described. The optical disc with dual metallization exhibits visually distinct regions suitable for use for identification purposes.

Abstract: The information recording medium 3 comprises an information layer having a metal layer 5 on a substrate 4, wherein concavo-convex portion is formed in the substrate to give main information such as image and voice, and the metal layer contains Al, Si and M (wherein M is at least one element selected from a group consisting of Cr and Ni) and enables sub-information to be additionally recorded therein at low cost by laser-beam 7 irradiation.

Abstract: Disclosed herein is a recording material for an optical recording medium. The recording material has a composition represented by a general formula of BixGeyO(1-x-y), in which x and y respectively are atomic ratios of bismuth and germanium, and satisfy the requirements of the following formulae: 2.8?(x/y)?25 and 0.55?(1?x?y)?0.62.

Abstract: An information recording medium (9) of the present invention is an information recording medium with respect to which information can be recorded or reproduced by irradiation with an optical beam (1). The information recording medium (9) includes a second interface layer (103), a recording layer (104) and a first interface layer (105) in this order from the optical beam (1) incident side. The first interface layer (105) and the second interface layer (103) are disposed in contact with the recording layer (104). The second interface layer (103) contains M1 (where M1 is at least one element selected from Nb, Y, Dy, Ti, Si and Al), Cr and oxygen (O). The first interface layer (105) contains M2 (where M2 is at least one element selected from Nb, Y, Dy, Ti, Si, Al, Zr and Hf), Cr and oxygen (O). The first interface layer (105) and the second interface layer (103) each contain Cr in a range of 50 mol % or less in terms of the oxide (Cr2O3).

Abstract: This invention relates to the use of polycarbonate for the production of an optical recording medium in which secure high speed operation, a transcriptability of the pit/groove structure of >85% and sufficient disc flatness can be achieved and the polycarbonate is based on bisphenol A and the polycarbonate contains a release agent in an amount less than 2000 ppm.