223results about "Recording involving reflectivity/absorption/color-change" patented technology

To provide a near-IR absorption compound free from antimony or arsenic and excellent in stability, especially, in heat resistance, light fastness, and moisture-and-heat resistance and also an IR absorption filter, an optical information recording medium, and a resin composition excellent in durability by using the near-IR absorption compound.

The near-IR absorption compound is a diimmonium compound having the following structure and the resin composition contains the diimmonium compound:

(wherein R₁ to R₈ independently denote hydrogen atom or an optionally substituted aliphatic hydrocarbon group; R₉ and R₁₀ independently denote an aliphatic hydrocarbon group optionally containing a halogen atom; and rings A and B may further have substituent groups.).

According to one embodiment, a write-once type information storage medium using a recording material which has a low to high characteristic that a light reflectivity in a recording mark increases with respect to a non-recording area and which has a recording characteristic in accordance with a principle of recording without substrate deformation, wherein the recording material includes at least an organic metal complex, and wherein the organic metal complex includes a center metal.

An optical recording medium is provided which can solve a problem of insufficient signal amplitude of one recording layer as compared with the other recording layer in a writable optical recording medium of a conventional double layer structure. An optical recording medium, in which a first substrate having a first groove formed thereon, a first recording layer formed on a first-groove forming surface of the first substrate, a semi-translucent first reflecting layer, an intermediate layer, a second recording layer, a second reflecting layer, and a second substrate having a second groove formed thereon are at least disposed in this order, wherein the optical recording medium further includes a heat conducting layer between the second recording layer and the intermediate layer and a heat insulating layer between the second recording layer and the second reflecting layer.

An optical disk apparatus records information by irradiating a laser beam from a pickup onto an optical disk. A scanning section scans the laser beam relative to the optical disk. A recording control section controls the scanning section to effect recording of information. A drawing control section is provided for controlling the pickup and the scanning section to effect drawing of a visible image on the optical disk according to image information, such that the laser beam is changed between a first intensity incapable of acting on the optical disk and a second intensity capable of acting on the optical disk. A servo section periodically detects the laser beam reflected back from the optical disk when the laser beam has the first intensity, and servo-controls the irradiating of the laser beam during the drawing of the visible image based on the detection of the laser beam. The drawing control section controls the pickup for forcibly changing the laser beam to the first intensity from the second intensity when the second intensity is maintained over a predetermined period pursuant to the image information, thereby enabling the servo section to detect the laser beam having the first intensity for continuing the servo-control.

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 medium includes a substrate, two recording layers provided on the substrate and two dielectric layers each provided adjacent to one of the recording layers, the optical recording medium being constituted so that when it is irradiated with a laser beam having a wavelength lambda via an objective lens having a numerical aperture NA satisfying lambda/NA<=640 nm from the side opposite from the substrate, a record mark whose reflection coefficient is different from those of other regions of the recording layers is formed in the recording layers and at least a part of a region(s) of the dielectric layers adjacent to the record mark is crystallized to form a crystallized region. According to the thus constituted optical recording medium, it is possible to reproduce a signal having excellent signal characteristics.

In an information recording medium comprising at least a substrate, a recording layer, and a resin layer, the substrate is formed with at least a pit corresponding to a read only area 31 and a groove corresponding to a recording/reproducing area 32 without overlapping with each other. A reflectivity of the recording layer is specified to be more than 10%. The recording layer and the resin layer are continuously adhered over both the read only and recording/reproducing areas 31 and 32. The information recording medium is characterized in that both push-pull signal outputs T1 and T2, which are reproduced from the read only area 31 and the recording/reproducing area 32 respectively, are more than 0.1 and satisfy an inequality 1.5≧T1/T2≧0.5.

An optical recording medium includes a substrate, a light transmission layer and a plurality of recording layers between the substrate and the light transmission layer and capable of recording data in the plurality of recording layers and reproducing data recorded in the plurality of recording layers by projecting a laser beam via the light transmission layer onto the plurality of recording layers, at least one recording layer other than a farthest recording layer from the light transmission layer including a reflective film containing Ag as a primary component and C as an additive. In the thus constituted optical recording medium, recording characteristics and reproducing characteristic of the respective recording layers can be improved.

An optical recording medium adapted for high density recording with a light of short wavelength which exhibits excellent jitter properties, and its recording method are provided. The optical recording medium recorded and/or reproduced with a light at a wavelength of 600 to 680 nm comprises a substrate having grooves formed on its surface at a track pitch of up to 0.8 mu m, and a recording layer containing an organic die disposed on the substrate. Depth A and width B of the groove ( mu m) and leveling ratio C are in the relation:0.035</=AxB</=0.06, and2</=C/A</=3.5when the leveling ratio C is represented by the following formula (I): leveling ratio=[thickness of the recording layer on the groove ( mu m)-thickness of the recording layer on the land ( mu m)]/[depth of the groove ( mu m)]

An optical recording medium includes a substrate, a first recording layer formed on the substrate and containing an element selected from the group consisting of C, Si, Ge and Sn as a primary component, and a second recording layer located in the vicinity of the first recording layer and containing an element selected from the group consisting of C, Si, Ge and Sn and different from the element contained as a primary component in the first recording layer as a primary component. According to thus constituted optical recording medium, it is possible to optically record data therein and reproduce data therefrom by projecting a laser beam having a wavelength of 350 nm to 450 nm thereonto, which includes two or more recording layers and is capable of decreasing noise level and improving C/N ratio of a reproduced signal.

The present invention relates to an information recording medium for recording and reproducing information using light and an information recording method to attain high-speed recording and high-density recording. An electrolyte layer 2 is sandwiched by the first conductive polymer layer (an electrochromic layer) 1 comprising a conductive polymer electrochromic material and the second electrolyte layer 7, and both sides of the first and the second conductive polymer layers are sandwiched by electrode layers 3 and 4. The heat generation area in recording is so narrow that some drift in auto-focusing and tracking is allowable, which enables high-speed rotation leading to high-speed recording and high-density recording.

This invention related to an optical disc recording apparatus, an optical disc recording method, and an optical disc, and the present invention is applied to, for example, apparatus for recording on a compact disc, compact discs, and compact disc players, and sub-data strings are recorded so that the main data strings is reproducible by an optical pickup for reproducing the main data string and the main data strings are protected from being copied illegally without any adverse effect on reproduction of the pit-and-land main data strings. The sub-data string ED is recorded by locally changing the reflectance of the reflection film in the form of irregularity such as pit or mark at the timing which does not affect the position information of the edge.

Metal alloy thin films are provided for use in the highly reflective and semi-reflective layers of optical discs. Alloys include silver alloyed with gold, palladium, copper, rhodium, ruthenium, osmium, iridium, and platinum. Other alloys include copper alloys with silver, magnesium, cadmium, aluminum, nickel, beryllium, zirconium and zinc. These alloys have moderate to high reflectivity and reasonable corrosion resistance in the ambient environment.

Selected domains, normally 2x103x2x103 such domains arrayed in a plane, within a three-dimensional (3-D) volume of radiation-sensitive medium, typically 1 cm3 of spirobenzopyran containing 2x103 such planes, are temporally and spatially simultaneously illuminated by two radiation pulses, normally laser light pulses in various combinations of wavelengths 532 nm and 1024 nm, in order, dependent upon the particular combination of illuminating light, to either write binary data to, or read binary data from, the selected domains by process of two-photon (2-P) interaction/absorption. One laser light pulse is preferably directed to illuminate all domains during its propagation along one directional axis of the volume. The other laser light pulse is first spatially encoded with binary information by 2-D spatial light modulator, and is then (i) directed and (ii) time sequenced to intersection with the other light pulse in a locus of intersection domains. During writing the selected, simultaneously illuminated, intersection domains change their index of refraction, attendant upon a change in isomeric molecular form, by process of 2-P absorption. During reading selected intersection domains selectively refract each of two read light pulses identically-as well as fluoresce-dependent upon their individually pre-established, written, states. The selective refraction of each read pulse in its passage straight through the volume is sensed in a detector array. I/O bandwidth to each cm3 of radiation-sensitive medium is on the order of 1 Gbit/sec to 1 Tbit/sec.

An optical recording medium comprising a recording layer containing ultrafine particles of a metal selected from the Group 8 and Group 1B elements, said particles having an average particle size of 1 nm to 50 nm, and surfaces thereof being modified with an adsorptive compound.

An information recording medium (21) of the optical information reproduction device of the present invention includes a recording unit (3) capable of recording information three-dimensionally and provided with a track, and information is recorded by forming a plurality of recording marks along the track of the recording unit by a mark length recording method. When the track direction of the recording marks is assumed to be their longitudinal direction and the direction perpendicular to the track direction is assumed to be their lateral direction, with the present invention, for recording marks located substantially in the same plane, the total area of elongated recording marks, whose longitudinal length is greater than their lateral length, is greater than the total area of recording marks having other than elongated shapes. The optical information reproduction device of the present invention includes a first light source (20a) for emitting a reproduction light (22b) having a wavelength λ₁, an objective lens (6) for focusing the reproduction light on the recording unit, and a first photodetector (19a) for detecting a reproduction signal from the reflected light from the recording unit. The focused reproduction light includes as its main component a polarized light component that is polarized perpendicular to the track direction. Also, the recording unit has a track pitch of no more than 1.3 times the wavelength λ₁ of the reproduction light.

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.

A write-only-read-many type optical recording medium includes a substrate, an organic material layer having a light absorption function that is sufficient for recording in the recording/reproduction wavelength range, the organic material layer being situated on the substrate, and a reflection layer being situated on the organic material layer. The recording medium is configured to have a Low-to-High recording property and record with a laser having a wavelength that is no greater than 500 nm.