465results about "Recording layers" patented technology

A phase change memory comprises: a substrate; an insulation film formed on a main surface of the substrate; a first electrode deposited on the insulation film; a phase change recording film deposited on the first electrode; and a second electrode deposited on the phase change recording film. The phase change recording film contains at least two of Ge, Sb and Te as main constituting elements thereof. The first electrode comprises material of group of Ti, Si and N, or group of Ta, Si and N as main constituting material thereof.

Conventional lenses for DVD / CD compatible writing / reading are liable to CD jitter deterioration due to phase shifts in a central area.Setting a corresponding base material thickness of an intermediate area of the circumference A2 to greater than 1.2 mm which is the base material thickness of the CD, that is, converging luminous flux that has passed through the intermediate area of the circumference A2 onto a farther place than the information recording surface of the base material thickness of the CD makes it possible to reduce jitter deterioration due to phase shifts. Further, it makes possible to provide a system with higher precision and higher reliability.

An optical recording medium includes a support substrate, a light transmission layer whose one surface constitutes a light incidence plane through which a laser beam is projected, an information recording layer formed between the support substrate and the light transmission layer, a reflective layer formed between the information recording layer and the support substrate, a water proof layer formed between the reflective layer and the support substrate and containing a mixture of ZnS and SiO2 as a primary component, and a corrosion resistant layer formed between the water proof layer and the reflective layer. According to the thus constituted optical recording medium, it is possible to effectively prevent a reflective layer from being corroded and has excellent storage reliability.

An information recording medium includes a substrate and an information layer formed on the substrate. The information layer includes a recording layer whose phase can be changed between a crystalline phase and an amorphous phase by irradiation with a laser beam or application of electric energy; a Cr-containing layer including at least Cr and O, arranged in contact with a first surface of the recording layer; and a Ga-containing layer including at least Ga and O, arranged in contact with a second surface of the recording layer.

A phase-change optical recording medium has a recording film that brings about reversible phase-change between a crystalline phase and an amorphous phase upon irradiation with light and an interface film formed in contact with at least one surface of the recording film and comprising hafnium (Hf), silicon (Si), oxygen (O) and carbon (C).

By use of a substrate which can be stably formed and has a relatively small groove depth, a very high density optical recording medium having good recording / reading characteristics is provided. In an optical recording medium of a surface incidence type, in which a reflective layer, a recording layer containing a dye as a main component and a cover layer are sequentially formed on a substrate having guide grooves formed therein, a guide groove part on a far side from a plane of incidence of a recording / reading light beam on the cover layer is set as a recording groove part, and reflected light intensity in a recorded pit portion formed in the recording groove part is increased by a phase shift and is set higher than reflected light intensity in unrecorded.

An optical recording device 10 of the present invention has a support substrate 11; an optical transmitting layer 12; and a first dielectric layer 31, a noble metal oxide layer 23, a second dielectric layer 32, a light absorption layer 22, a third dielectric layer 33, and a reflection layer 21, all of which are interposed, in this sequence from the optical transmitting layer, between the optical transmitting layer and the support substrate. The thickness of the support substrate 11 ranges from 0.6 mm to 2.0 mm; the thickness of the optical transmitting layer ranges from 10 μm to 200 μm; the thickness of the noble metal oxide layer ranges from 2 nm to 50 nm; the thickness of the second dielectric layer ranges from 5 nm to 100 nm; the thickness of the light absorption layer 22 ranges from 5 nm to 100 nm; and the thickness of the third dielectric layer 33 ranges from 10 nm to 140 nm. A superior characteristic can be acquired through super-resolution recording and super-resolution reproduction using an optical system for use with an optically recording medium of the next generation type.

A holographic recording medium includes a transparent layer having a servo surface and a light incidence surface which face each other; a reflecting layer formed on the servo surface-side transparent layer; and a holographic recording layer formed on the light illuminating-side transparent layer. The transparent layer includes resin films laminated so that adjacent resin films differ in stretching direction by 90 degrees.

In a holographic recording medium, noise is prevented from being generated by servo light in a recording layer without scarifying recording regions. A holographic recording medium 12 has a servo layer 16 formed on a recording layer 14 on a substrate 13 via a spacer layer 15. The servo layer 16 reflects the servo light and has one of wavelength selectivity and incident angle selectivity each of which allows object light and reference light to pass through.

A phase-change optical recording medium has a recording film that brings about reversible phase-change between a crystalline phase and an amorphous phase upon irradiation with light and an interface film formed in contact with at least one surface of the recording film and comprising hafnium (Hf), silicon (Si), oxygen (O) and carbon (C).

An information recording medium for high-density recording and reproduction that is low-cost and that has good rewrite characteristics. The information recording medium, in which recording is performed as an atomic arrangement is changed by optical irradiation, is capable of a number of rewrites. The information recording medium comprises a substrate on which a first protective layer with a thickness in the range from 18 to 65 nm, a recording film, a second protective layer, and a reflective layer are disposed in the mentioned order as seen from a light-incident side. Not less than 97 atomic % of the composition of the recording film is accounted for by Ge, Bi, and Te.

In an optical information recording medium having at least two information layer, guide grooves for tracking or sample pits or information pits corresponding to information signals are formed on a surface of a first substrate. A first information layer formed by a thin film for reflecting a portion of a light beam made incident on the first substrate and permitting penetration of a portion of the light beam is formed on a surface of the first substrate. Guide grooves for tracking or information pits corresponding to information signals are formed on a surface of a second substrate. A second information layer having a reflectance higher than that of the first information layer is formed on a surface of the second substrate. Between the first information layer and the second information layer, there is formed a transparent separation layer for positioning the first information layer and the second information layer to be spaced a predetermined distance apart from each other.

An optical disc (101) to and from which information can be reproduced and recorded by laser irradiation is provided with a first recording layer (102) and a second recording layer (104). The first recording layer (102) has a first recording mark (103) that is formed in a spiral track. The second recording layer (104) is behind or in front of the read-side surface of the first recording layer (102), and neither a wobble track nor a track for reproducing or recording information by laser irradiation is formed on the second recording layer (104). On the second recording layer (104) are formed, by laser irradiation, a second recording mark (105) that is positioned in the radial direction of the optical disc according to a predetermined position on the spiral track of the first recording layer. The optical disc (101) ensures the secrecy of the copyright protected information that is recorded thereto and the copyright protection function of the optical disc (101), and is resistant against illegal copying.

In an optical information recording medium having at least two information layer, guide grooves for tracking or sample pits or information pits corresponding to information signals are formed on a surface of a first substrate. A first information layer formed by a thin line for reflecting a portion of a light beam made incident on the first substrate and permitting penetration of a portion of the light beam is formed on a surface of the first substrate. Guide grooves for tracking or information pits corresponding to information signals are formed on a surface of a second substrate. A second information layer having a reflection higher than that of the first information layer is formed on a surface of the second substrate. Between the first information layer and the second information layer, there is formed a transparent separation layer for positioning the first information layer and the second information layer to be spaced a predetermined distance apart from each other.

An optical recording medium comprises first and second substrates wherebetween there is arranged at least one first photosensitive layer, preferably made of inorganic material. The first photosensitive layer comprises a front face for receiving optical radiation, by means of the second substrate, during data writing and / or reading operations. A first deformable layer, transparent to the optical radiation, is arranged between the first photosensitive layer and the second substrate. The first substrate comprises a patterned front face, so as to form a preferably spiral-shaped groove enabling precise data writing and / or reading to be performed by means of an automatic focusing control and track monitoring system.

The invention relates to an information carrier (801) comprising: a data layer (802) intended to store a set of elementary data, a layer (803) comprising an array of apertures (804) placed parallel to said data layer (802) for generating an array of light spots intended to be applied to said data layer (802). The invention also relates to a system and apparatus for reading such an information carrier.

According to an embodiment, a storage medium includes a transparent resin substrate having a concentric or spiral groove and a recording film formed on the groove on the transparent resin substrate, a recording mark being formed by irradiation of a laser beam, wherein a reproduction durability count in a case where reproduction is continuously carried out by a laser beam is 1,000,000 or more.

An optical recording medium, an optical recording and reproducing method, and an apparatus that can record and reproduce multilevel information at a high density and with a high S / N ratio. Recording light emitted from a light source is collimated by a collimation lens and introduced into a polarization rotary device. Recording light transmitted by the polarization rotary device is focused by an objective lens onto an optical recording medium. In response, a photo-induced birefringence is recorded on the optical recording medium. Multilevel recording is performed by controlling a voltage applied to the polarization rotary device to change a polarization angle θ of recording light. Reproduction is performed by detecting light reflected from the optical recording medium with an analyzer and a detector.

An optical information recording medium for recording and reproducing information by irradiation with a laser beam having a wavelength lambda of 450 nm or less includes a substrate 14 and a plurality of information layers formed on the substrate. A first information layer 8 closest to an incident side of the laser beam among the plurality of information layers includes a recording layer 4, a reflection layer 6 and a transmittance adjusting layer 7. A transmittance Tc1 (%) of the first information layer 8 at the wavelength lambda in a case of the recording layer 4 in a crystal phase and a transmittance Ta1 (%) of the first information layer 8 at the wavelength lambda in a case of the recording layer 4 in an amorphous phase satisfy 46<Tc1 and 46<Ta1. Furthermore, a refractive index n1 and an extinction coefficient k1 of the transmittance adjusting layer 7 at the wavelength lambda, and a refractive index n2 and an extinction coefficient k2 of the reflection layer 6 at the wavelength lambda satisfy 1.5<=(n1-n2) and 1.5<=(k2-k1).

An optical disc playback method is provided which includes steps of reading identification data recorded in an optical disc loaded in an optical disc player and starting reading data from a second recording area of the optical disc loaded in the optical disc player when it is determined that the loaded optical disc is a one having at least a first recording area and second recording area, a first lead-in area provided along the inner circumference of the first recording area, a second lead-out area provided along the outer circumference of the first recording area, a second lead-in area provided between the outer circumference of the first lead-out area and second recording area, and a second lead-out area provided along the outer circumference of the second recording area.

An optical recording medium includes a recording layer provided on a substrate. The recording layer includes first and second information layers and a spacer layer therebetween. The optical recording medium also includes a warpage adjusting layer provided on the side of the substrate opposite to the recording layer to reduce the warpage of the spacer layer caused by curing. A moisture proof layer is formed on the surface of the warpage adjusting layer opposite to the recording layer to reduce the warpage of the warpage adjusting layer caused by moisture absorption and releasing by the warpage adjusting layer.

An information recording medium is provided that includes a recording portion (3), which is irradiated with a recording light or a reproducing light so that information is recorded or reproduced thereto or therefrom. The recording portion (3) contains a first phosphor and a photon-mode photosensitive material. The first phosphor has a property of absorbing a first light having a wavelength of λ1 / n and then emitting a second light having a wavelength longer than that of the first light, where λ1 is a wavelength of the recording light. The photosensitive material absorbs the second light and then exhibits a change in an optical constant thereof. A n-photon absorption sensitivity of the first phosphor with respect to the recording light is greater than a n-photon absorption sensitivity of the photosensitive material with respect to the recording light, where n is an integer not less than 2.

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.

In order to realize (A) an optical information recording medium in which information is stored in high density and can be precisely and securely reproduced, (B) a method for reproducing the optical information recording medium, and (C) an optical information processing apparatus using the optical information recording medium, an optical information recording medium 1, 2, or 3 of the present invention includes: (a) a substrate 12, having pits and / or grooves, each of which is made up of a rise and a recess, and each of which corresponds to recorded information that is optically reproduced by irradiation of a light beam; and (b) at lease one super resolution reproducing film 13, which has an optical property to be changed in response to a temperature increase caused by the irradiation of the light beam, the optical property of the super resolution reproducing film being reversibly changed depending on a temperature change in the super resolution reproducing film. The optical information recording medium 3 of the present invention further includes a recording layer.

A disc having grooves and pits with different depths according toλ / 8n≦d3≦λ / 5nwhere d3 is a difference in depths between the grooves and the pits, λ is the wavelength of a light source, and n is the refractive index of the disc. A disc having grooves and pits with different depths can be manufactured without etching by using at least two stampers. Manufacturing a master by depositing photoresist over a glass master, forming a first land region and a second land region having different depths by laser cutting with laser beams having different power levels. Stamping a father stamper having a groove region and a pit region from the master, the shape of the father stamper inverse of the master. Stamping a mother stamper from the father stamper, the shape of the mother stamper inverse of the father stamper. Manufacturing the disc with the mother stamper.

An optical information recording carrier comprising: a back layer; a support; a recording layer; and a light transmitting layer, in this order, wherein each of the back layer and the light transmitting layer comprises at least one substrate film, wherein a difference between a hygroscopic expansion coefficient of the at least one substrate film and a hygroscopic expansion coefficient of the support is 10 ppm / % RH or more.