Abstract: A rewritable optical recording medium including: a substrate having a guide groove formed thereon, a phase-change type recording layer, a portion in a crystalline state of the phase-change type recording layer corresponds to an unrecorded or erased state, and a portion in an amorphous state of the phase-change type recording layer corresponds to a recorded state, so that an amorphous mark corresponding to the recorded state is formed upon irradiation with a recording laser beam. The phase-change type recording layer contains Sb as a main component, and further contains Ge and/or Te, a content of Ge is from 1 atomic % to 30 atomic %, and a content of Te is from 10 atomic % to 30 atomic %, and in the phase-change type recording layer, Sb/Te is at least 4.5, and the atomic ratio of Ge to Te is from 1:3 to 1:20.

Abstract: Disclosed is a system and a method of providing a VOD (Video On Demand; below referred to as ‘VOD’) preview channel through channel zapping in a real-time broadcast service. To do this, the present invention includes a VOD preview channel for a VOD service between real-time broadcast channels, and allows a user to view a VOD screen as well as a real-time channel through channel zapping. As a VOD screen, a playing screen for playing a pre-downloaded VOD preview content for the corresponding VOD preview channel is displayed, and the corresponding VOD can be watched through such functions as an initial viewing and a continuous viewing if a viewing on the screen is wanted.

Abstract: In an optical recording medium having a plurality of recording layers on which information can be recorded by irradiating a laser beam from one side thereof, an optimum recording power to each of the recording layers can be determined. The optical recording medium has a plurality of recording layers on which information can be recorded by irradiating a laser beam from one side thereof, and each of the recording layers has a power calibration area (PCA) for optimizing the intensity of the laser beam.

Abstract: In an optical recording medium of a single-sided incident type having a plurality of recording layers, recording/reading conditions (for example, tracking polarity, recording pulse strategy, recording recommended power, etc.) can be instantaneously switched according to each of the recording layer, and recording or reading of information can be accurately and surely performed under recording/reading conditions adapted to each recording layer. A control unit reads out layer information from one recording layer of the optical recording medium in which the layer information is recorded in each of the plural layers, on which recording or reading of information can be performed by irradiating a laser beam from one side thereof (layer information reading step), and controls so that recording or reading is performed under recording/reading conditions adapted to a recording layer specified on the basis of the layer information (recording controlling step).

Abstract: To provide an optical recording medium of which mechanical properties and storage stability will not be impaired, and which will show little deterioration in signal properties even after being left to stand at high temperature under high humidity. An optical recording medium to perform recording/reading by means of blue laser, which has a value of 10 or less as obtained by “error rate after its environmental resistance test/error rate before its environmental resistance test” in error rates obtained before and after its environmental resistance test carried out by leaving the medium to stand for 500 hours at a temperature of 80° C. under a relative humidity of 80%.

Abstract: 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.

Abstract: An optical recording medium on which high-density recording and reading of optical information can be conducted by a short-wavelength light such as a blue laser beam is provided. In an optical recording medium comprising at least a substrate and a recording layer thereon that can record or read information by irradiation with light, the recording layer contains an azacyanine dye represented by general formula [I]: wherein R1 and R2 each independently represent a hydrogen atom or an optionally substituted linear or branched alkyl group having one to four carbon atoms; R3 represents a hydrogen atom or a hydrocarbon group; R4 represents a hydrogen atom or a linear or branched alkyl group having one to four carbon atoms; R5 represents an optionally substituted aromatic ring group or an optionally substituted unsaturated heterocyclic group; R4 and R5 may be combined together to form a ring; X? represents a counter anion; and the benzene ring A may be optionally substituted.

Abstract: The invention is principally to provide an archival optical recording medium of high quality which has satisfactory recording/reading characteristics when used in high-speed recording and high-density recording. The invention accomplishes the object with an optical recording medium comprising a resin substrate, a recording layer comprising an organic dye, and a reflective layer, wherein the reflective layer has a first reflective layer and a second reflective layer in this order from the side close to the recording layer, the second reflective layer has a thermal conductivity lower than the thermal conductivity of the first reflective layer, and the first reflective layer has a film thickness larger than the thickness of the second reflective layer.

Abstract: In an optical recording medium having a plurality of recording layers on which information can be recorded by irradiating a laser beam from one side thereof, an optimum recording power to each of the recording layers can be determined. The optical recording medium has a plurality of recording layers on which information can be recorded by irradiating a laser beam from one side thereof, and each of the recording layers has a power calibration area (PCA) for optimizing the intensity of the laser beam.

Abstract: To provide an optical recording medium on which recording/retrieving of high density optical information is possible by a short wavelength light such as a blue laser. An optical recording medium comprising a substrate and a recording layer capable of recording or retrieving information by irradiation with light, formed on the substrate, wherein the recording layer contains the cyanine dye represented by the following formula (I): wherein each of A1 and B1 which are independent of each other, is an aromatic ring which may have a substituent, provided that at least one aromatic ring of A1 and B1 contains a nitrogen atom; each of R1 and R2 which are independent of each other, is a substituent, provided that R1 and/or R2 may be bonded to other cation; each of X1, X2, X3 and X4 which are independent of one another, is an organic group, provided that a pair of X1 and X2, and/or a pair of X3 and X4, may be mutually bonded to form a cyclic structure; Y1 is a hydrogen atom or an organic group; and Z is an anion.

Abstract: The invention provides an azo metal chelate dye suitable for use in a recording layer of an optical recording medium capable of high-speed recording or an optical recording medium having plural recording layers, and an optical recording medium. The azo metal chelate dye comprises an azo dye compound represented by the general formula (1) and Zn2+: (wherein R1 represents a linear or branched alkyl group that may be substituted, or a cycloalkyl group that may be substituted; Y represents a linear or branched alkyl group substituted with at least two fluorine atoms; R2, R3, R4, R5 and R6 each independently represents a hydrogen atom or a linear or branched alkyl group that may be substituted, and R3 and R4, R4 and R5, or R5 and R6 may be bonded with each other to form a ring; and a proton is released from the compound of formula (1) to form the chelate dye together with Zn2+).

Abstract: Disclosed is an optical recording medium which can increase the gloss of a print receptive layer provided on a level surface and can provide a high quality print. An optical recording medium (200) comprises a record-reproducing layer (10) which is a substrate-incident medium and a print receptive layer (20) which can be printed with an ink and is provided on the surface opposite to the surface of the record-reproducing layer (10) which receives the irradiation with light. The print receptive layer (20) comprises a filler-containing layer (22) which contains a hydrophilic resin and an organic or inorganic filler as main ingredients and a non-filler-containing layer (21) which is laminated on the filler-containing layer (22) and contains no organic or inorganic filler.

Abstract: To produce an optical recording medium having a good concavo-convex shape whereby optical information recording/retrieving is stabilized. A process for producing an optical recording medium 100 provided with an interlayer 104 having a concavo-convex shape, which comprises a step of forming a recording layer 102 on a substrate 101 directly or via another layer; a step of placing a resin material layer 104a and a stamper 110 having a concavo-convex shape for transfer, in this order on the recording layer 102, and curing the resin material layer 104a in this laminated state to obtain a bonded body 112 comprising the substrate 101, the recording layer 102, the resin material layer 104a and the stamper 110, and a step of separating the stamper 110 from the resin material layer 104a so that the concavo-convex shape for transfer is transferred to the resin material layer 104a, and applying surface modification treatment to promote the curing of the resin material layer 104a, to form the interlayer 104.

Abstract: Disclosed therein is a window of an infrared surveillance camera, which can prevent that the window gets damp even though there is a difference in temperature between the inside and the outside of the surveillance camera due to a long time operation of the surveillance camera.

Abstract: The invention is principally to provide an archival optical recording medium of high quality which has satisfactory recording/reading characteristics when used in high-speed recording and high-density recording. The invention accomplishes the object with an optical recording medium comprising a resin substrate, a recording layer comprising an organic dye, and a reflective layer, wherein the reflective layer has a first reflective layer and a second reflective layer in this order from the side close to the recording layer, the second reflective layer has a thermal conductivity lower than the thermal conductivity of the first reflective layer, and the first reflective layer has a film thickness larger than the thickness of the second reflective layer.

Abstract: To provide an optical recording medium excellent in the balance of characteristics, which has a sufficient surface hardness and of which the deformation when the environmental temperature and the environmental humidity change is small. An optical recording medium comprising a resin substrate, a recording and reading layer, a cover coat layer which is a cured product of a radiation-curable composition containing a urethane (meth)acrylate (A) and a (meth)acrylate compound (B) other than the urethane (meth)acrylate (A), and a hard coat layer having a surface hardness of at least B in this order, wherein of the cover coat layer, the ratio of the elastic modulus in tension upon absorbing water to saturation to the elastic modulus in tension at 25° C. under a humidity of 45% is at least 0.20.

Abstract: In a single-sided incident type optical recording medium having a plurality of dye containing recording layers, sufficient reflectance and excellent recording characteristics necessary to record or read information in or from a dye containing recording layer positioning farther from a side from which a light beam comes in can be obtained. The optical recording medium has a first substrate (21) having a guide groove, a first dye containing recording layer (22), a semitransparent reflective layer (23), an intermediate layer (24), a second dye containing recording layer (25), a reflective layer (26) and a second substrate (27) having a guide groove. Information is recorded or read in or from the first dye containing recording layer (22) and the second dye containing recording layer (25) by irradiating the light beam from the first substrate's side. The depth of the guide groove on the second substrate is within a range from 1/100 ×? to 1/6 ×? where ? represents the recording/reading wavelength.

Abstract: For an optical recording medium having a phase change type recording layer on its a substrate and having as read only area and a writable area in a recording area, a data recording method is provided which records data in the writable area. This data recording method comprises a transfer step of transferring program data recorded in the read only area in a practical form to an external computer, and an execution step (step A10) of automatically executing the program data in the external computer to record data in the writable area, which can facilitate manufacturing and reduce the possible of destruction or falsification of ROM data.

Abstract: Stable focus servo and tracking servo are realized in an information recording medium having a plurality of recording regions having different track pitches and groove shapes.

Abstract: An optical recording medium is provided which has excellent jitter characteristics and satisfactory recording/reproducing characteristics and is capable of extremely high-density recording. The optical recording medium 20 comprises a substrate 21 having a guide groove and the following layers formed on the substrate 21 in the following order: a layer 23 having a light-reflecting function, a recording layer 22 containing a specific porphyrin compound as a main component, and a cover layer 24 capable of transmitting a recording/reproducing light entering the recording layer 22, wherein when a portion of the guide groove at a side far from a surface where a recording/reproducing light beam enters the cover layer 24, is represented as a recording groove portion, then a recording pit portion formed in the recording groove portion, has a higher reflective optical intensity than the recording groove portion in an unrecorded state.