Abstract: In a case of performing recording/playing with an information recording layer with a first light irradiation, and controlling the recording/playing positions on the information recording layer by a second light irradiating as to a position control information recording layer provided separately from the information recording layer, corrections to shifts in recording positions and playing positions that occurs as a result of shifts in the optical axes of the first and second lights. A disc-shaped recording medium has multiple pit row phases wherein, the pit rows having a spacing between one round of pit formable positions that is limited to a predetermined first spacing are formed in a spiral shape or concentrically, and with pit rows arrayed in the radius direction, the spacing in the pit row forming direction of the pit formable positions is set to positions shifted by a predetermined second spacing.

Abstract: There is provided a playback device including an adjustment portion that, based on a first data recording surface among a plurality of data recording surfaces of an optical recording medium, adjusts tilt with respect to the first data recording surface, an adjustment amount measurement portion that measures a first tilt adjustment amount from a result of the tilt adjustment, an acquisition portion that acquires a coma aberration of the playback device, and a calculation portion that, based on the first tilt adjustment amount and the coma aberration, calculates a second tilt adjustment amount to adjust tilt with respect to a second data recording surface that is different to the first data recording surface.

Abstract: Disclosed are a pickup device assembly and an optical drive system. The assembly may comprise: a laser generator for generating laser beams; an objective lens; and at least one piezoelectric actuator for generating bending moments once applied with voltages, wherein the generated bending moments move the objective lens such that the laser beams are focused by the objective lens and then aim at concentric spiral data tracks of a disc with a strongest reflected signal of the laser beams from the disc.

Abstract: A vertical cavity surface emitting laser includes a substrate, a first semiconductor multilayer film reflector formed on the substrate, an active region formed on the first semiconductor multilayer film reflector, a second semiconductor multilayer film reflector formed on the active region, an electrode which is formed on the second semiconductor multilayer film reflector and in which a light emitting aperture is formed, a first substance that is composed of a material and that is formed in the light emitting aperture, and a second substance that is composed of a dielectric and that is formed on the first substance to cover one portion of the first substance. Light having an emission wavelength can pass through the material and dielectric. A reflectivity of a portion covered with the second substance is higher than a reflectivity of a portion that is not covered with the second substance.

Abstract: An optical pickup having a one-plane, two-wavelength diffraction grating and a two-wavelength laser generator is provided in which crosstalk noise caused by leakage of a track error signal into a focus error signal is reduced to improve focus control performance. A main beam and sub-beams generated by the one-plane, two-wavelength diffraction grating and reflected from the surface of an optical disc are incident on corresponding light receiving elements among which the one to receive the main beam and those to receive the sub-beams are relatively shifted in a linear-speed direction of the optical disc. The distance of the shifting is determined based on the characteristic, relative to the relative positions of the light receiving elements, of the leakage of the tracking error signal into the focus error signal detected based on the main beam and sub-beams.

Abstract: An exemplary method of controlling an optical storage apparatus includes: driving a first mechanical mechanism of the optical storage apparatus by applying a first control signal to the first mechanical mechanism, wherein a second mechanical mechanism of the optical storage apparatus is inactive while the first mechanical mechanism is operating in response to the first control signal; adjusting the first control signal applied to the first mechanical mechanism when the second mechanical mechanism is requested to be active; and driving the second mechanical mechanism by applying a second control signal to the second mechanical mechanism while the first mechanical mechanism is operating in response to the adjusted first control signal.

Abstract: A polymerizable compound represented by the following formula (1): wherein A is a hydrogen atom or a group selected from the following formulae (2) to (5): VwH(3-W)C—??(2) PhxY(3-x)Si—??(3) J-(CH2)m1—CHl(CH3)(2-l)—??(4) J-(CH2)n1—SiPhp1(CH3)(2-p1)—??(5); B is a group selected from the following formulae (6) and (7): J-(CH2)m2—CHk(CH3)(2-k)—??(6) J-(CH2)n2—SiPhp2(CH3)(2-p2)—??(7); w is an integer of from 0 to 3; V is a methyl group or an ethyl group, provided that when w is from 2 to 3, a plurality of V's may be different groups, x is an integer of from 0 to 3, Y is a group selected from a methyl group, a cyclohexyl group, a tert-butyl group, a sec-butyl group and an isopropyl group, provided that when x is 0 or 1, a plurality of Y's may be different groups, J is a group selected from CH2?CR—COO—, an epoxy group, a vinyl group and a vinyl ether group, R is a hydrogen atom or a methyl group, I is an integer of from 0 to 1, k is an integer of from 0 to 2, provided that when A is a hy

Abstract: An optical information reproducing device is provided with a light focusing unit (8) for generating near-field light, a signal quality measuring circuit (22) for measuring reproduction signal quality of the optical information recording medium using the near-field light generated by the light focusing unit, a gap length determining circuit (17a) for determining a gap length between the light focusing unit and a surface of the optical information recording medium as a set value based on a measurement result on the reproduction signal quality in the signal quality measuring circuit, and a gap control circuit (24) for controlling a gap between the light focusing unit and the surface of the optical information recording medium based on the set value determined in the gap length determining circuit. Information is reproduced from the optical information recording medium using the near-field light generated by the light focusing unit.

Abstract: An optic disc writer device is an embedded type independent system. It has a host controller, a disc writer assembly, and a printer assembly. The disc writer assembly is electrically connected to the host controller and has a robotic arm, at least one disc writer, and an optic disc deposition zone. The robotic arm is operated to move to the optic disc deposition zone for picking and/or depositing an optic disc and to move the optic disc to the disc writer by which a writing operation is performed on the disc to provide a writing-completed disc. The printer assembly is electrically connected to the host controller. The printer assembly includes a disc tray that is controlled by the host controller for extension and withdrawal for receiving the writing-completed disc therein. The printer assembly is operated to form printing of patterns on a surface of the writing-completed disc.

Abstract: A method for reducing a number of input terminals of an APC circuit is provided, where the APC circuit is arranged to control an optical pickup unit (OPU) within an optical storage device. The method includes: utilizing at least one switching module to ground one of a first and a second input terminals of the APC circuit at a time; and utilizing the switching module to electrically connect an APC front end within the APC circuit to a non-grounded input terminal of the first and the second input terminals, in order to receive a detection signal of a photo diode of the OPU through the non-grounded input terminal at the time. An associated APC circuit is also provided.

Abstract: An optical disk compliant with both a conventional optical disk such as a BD, HD DVD, and the like and a next-generation high-density optical disk according to a near-field light recording system and the like is provided. An information recording medium includes a first information recording layer and a second information recording layer, to/from which information is recorded or reproduced using laser beam. The first information recording layer is formed at a laser beam entrance surface, and is configured so that information can be recorded thereupon and/or reproduced therefrom using a first objective lens having a first numerical aperture NA1 and laser beam of a first wavelength ?1. The second information recording layer is formed so as to have a distance to the laser beam entrance surface is 0.05 mm to 1.

Abstract: An apparatus having switchable servo gains and offsets for an optical disk drive adjusts its gains and offsets through the coupling of a servo signal and a switch with several changeable paths. The servo signals are either designated to undergo signal reduction with respect to a first offset through the switch and then be output after a first gain unit performed proportional conversion, or designated to undergo signal reduction with respect to a second offset and then be output after a second gain unit performed proportional conversion. The switch is switched on/off in the light of the working status of the pick-up head, for example, seeking or tracking, at a data area or at a blank area, and at a groove area or at a land area, so as to choose different offsets and gains to have the conversion of the servo signals.

Abstract: According to one embodiment, a system is provided for recording data in an optical disc having frames having different numbers. The system records data in each of the frames while writing synchronization information in each frame. The system is provided with an even/odd frame judgment unit, a synchronization information output unit, a synchronization information selection unit and a selection information output unit. The even/odd frame judgment unit judges whether the number of a frame having a land pre-pit is an even number or an odd number. The synchronization information output unit outputs plural pieces of synchronization information corresponding to different synchronization patterns. The synchronization information selection unit generates a selection signal for selecting one of the pieces of synchronization information to be written in each frame. The selection information output unit outputs the selected one of the pieces of synchronization information.

Abstract: An optical disk apparatus according to the present invention includes: a controller 111, which receives an instruction that a layer-to-layer jump be performed from a current layer to a target layer; a layer-to-layer jump control section 146, which adjusts a spherical aberration correction value to the target layer and then gets the layer-to-layer jump attempted; a decision section 146 for determining whether the layer-to-layer jump has been carried out successfully; and a layer determining section 146 for determining, if the focus position has been set on a non-target storage layer as a result of the layer-to-layer jump, where the non-target storage layer is located in the optical disk. The layer-to-layer jump control section 146 shifts the focus position of the light beam from that non-target storage layer to the target layer by reference to information indicating which of the multiple storage layers the non-target storage layer is.

Abstract: A system, method, and medium for forming a visible label on an optical disc. Label data for a label track of the disc is received into a buffer of a disc drive. The label data is analyzed to identify the label track. A surface contour of the disc is mapped only near the label track. Focus actuator signals for the label track are derived using the surface contour. The label track is marked, with a laser of the disc drive, according to the label data while the laser is focusing the focus actuator signals.

Abstract: An optical recording medium having a good power margin property during recording and good jitter during reading is provided. In an optical recording medium, a Ti recording layer that includes Ti as a main component and Al as an addition component and a first Si recording layer that is arranged adjacent to a cover layer side of the Ti recording layer and includes Si as a main component are stacked between a substrate and the cover layer.

Abstract: A disk device includes a loader chassis, a traverse chassis, an optical pickup, a clamp mechanism and a cam mechanism. The cam mechanism pivots the traverse chassis with respect to the loader chassis between a loading position and an unloading position. The cam mechanism includes a follower, a cam plate, a guide member and a biasing member. The cam plate has a first restricting face that restricts a first direction movement of the follower with respect to the cam plate. The guide member has a second restricting face that restricts a second direction movement of the follower with respect to the guide member. The biasing member biases the follower towards both the first restricting face of the cam plate and the second restricting face of the guide member when the traverse chassis is located at the loading position.

Abstract: When recording/reproducing an information recording medium having a plurality of information recording layers, a photodetector receives reflected light from a recording layer which is being recorded/reproduced, as well as reflected light from another recording layer which is not being recorded/reproduced, making it difficult to appropriately detect control signals during a recording/reproducing operation. The present invention employs a polarization hologram element so that the polarization direction of 0th-order diffracted light and that of 1st-order diffracted light are made to be orthogonal to each other before light reflected from an information recording medium is incident upon the detector. Thus, it is possible to reduce the influence of interference with light from the other recording layer and to obtain appropriate control signals, thereby realizing an optical pickup device with desirable recording capability.

Abstract: A lens pull-in method is used in a near-field optical accessing system. When a lens is in a far-field range, the lens is driven to approach a surface of an optical disc in an open loop control state. If the lens enters a near-field range, a first GES level is inputted as a set value and the lens is driven in a close loop control state. When the gap error signal decreases to the first GES level, the set value is changed to a second GES level, which is higher than the first GES level. When the gap error signal increases to the first GES level, the set value is changed to a target GES level, so that the gap error signal is maintained at the target gap error signal.

Abstract: A disclosed optical element includes three or more sub-wavelength convexo-concave structures having pitches less than a wavelength of an incident light incident to the optical element and having groove depths equal to each other and a periodic structure having the three or more sub-wavelength convexo-concave structures, the pitch of the periodic structure greater than the wavelength of the incident light, in which a predetermined polarization direction of the incident light is diffracted mainly into a specific order.

Abstract: A reading device includes a spatial light modulator, a zoom lens set, an object lens, an image sensor, and an adjusting module. The spatial light modulator provides a reading beam. The zoom lens set forms the reading beam into a real image. The object lens focuses the real image onto a collinear holographic storage medium and thus produces a diffraction signal. The image sensor converts the diffraction signal into an electric signal. The adjusting module adjusts the optical magnification of the zoom lens set according to the quality of the diffraction signal.

Abstract: An optical information storage medium includes: a substrate; a cover layer; and a first information layer interposed between the substrate and the cover layer, recording of information in the first information layer and reading of information recorded in the first information layer being realized by irradiation with a light beam incoming from the cover layer side, wherein the first information layer includes a recording film and a protection film interposed between the recording film and the cover layer, and a distance between the cover layer and the recording film is not less than 0.5 nm and not more than 12 nm.

Abstract: A system for processing information is provided. The system includes multiple micro-holograms contained in multiple volumes arranged along multiple tracks in one or more storage mediums. Each of the micro-hologram includes a data. The system also includes one or more pick-up head devices with optical lenses for directing laser beams on the multiple tracks. Further, the system includes a subsystem for arranging the one or more pick-up head devices for recording and retrieving of the data from the one or more storage mediums.

Abstract: An objective lens for an optical information recording/reproducing apparatus, at least one of optical surfaces of the objective lens comprising a diffraction surface having a diffraction structure defined by an optical path difference function, and wherein: the diffraction surface has a first region contributing to converging first and second light beams and having a diffraction structure configured such that diffraction orders at which the diffraction efficiencies are maximized for the first and second light beams are 1st order; the diffraction surface has a second region located outside the first region, and the second region is configured to contribute to converging the first light beam and not to contribute to convergence of the second light beam; and the objective lens satisfies a condition: 35<P2×f2<200 ??(1).

Abstract: The aberration takes place according to the height of the image because the laser light tilts from the optical axis when it enters to the object lens in the optical pickup device which is equipped with a laser diode for BD and the monolithic laser diode capable of irradiating laser lights with two different wavelengths for DVD and CD as one package to read the signal by single object lens and single optical system. This is because the light sources of the three lights with different wavelengths are away from each other in the optical pickup device. The emission point of the laser diode for BD is formed at the location shifted from the center of the chip. The laser diode for BD is disposed adjacent to the monolithic laser diode capable of irradiating laser lights with two wavelengths for DVD and CD to make the emission point closer to the monolithic laser diode. The sizes of these two laser diodes is minimized by employing half dicing during the cleavage processing for separating the chips.

Abstract: In the specification and drawings, a collinear holographic storage method is described and shown with a controlling step to control the temperature of the collinear holographic storage media such that the writing temperature of the collinear holographic storage media is from between about 5° C. to about 50° C. higher than the reading temperature of the collinear holographic storage media.

Abstract: An optical recording medium having a good power margin during recording is provided. In an optical recording medium, a Cu recording layer that includes Cu as a main component, a first Si recording layer that is arranged adjacent to the cover layer side of the Cu recording layer and includes Si as a main component, and a second Si recording layer that is arranged adjacent to the substrate side of the Cu recording layer and includes Si as a main component, are stacked between the substrate and the cover layer.

Abstract: An optical information processing method and apparatus performs a light irradiating and receiving step, a signal processing step, and an adjusting step of a spherical aberration and a focus offset on the basis of shift amount of first and second control devices and a performance evaluation value. The performance evaluation values for first, second, third and fourth points in an x and y coordinate system are detected, in which an x-coordinate is one of the shift amount of the first control device and the shift amount of the second control device and a y-coordinate is the other, the first point, second and third points having the same y-coordinate and different x-coordinates with each other, the fourth point being provided on a first straight line passing through the first point and being different from the first point.

Abstract: There is provided a motor for a disk drive apparatus. The motor includes a cone member, a substantially annular back yoke, a substantially annular clamp magnet, an adhesive agent, and a motor unit. A storage portion includes a clamper insertion portion formed in a position axially overlapping with the clamp magnet to accommodate the clamper when the clamper comes closer to the cone member. The back yoke includes a first surface opposed to the clamp magnet in a contact or adjoining relationship therewith and a second surface positioned near the clamper insertion portion and kept spaced apart from the clamp magnet. The cone member includes an adhesive agent staying portion arranged to accommodate a part of the adhesive agent. The adhesive agent stays portion being defined between the imaginary surface extending axially downwards from the circumferential surface of the clamp magnet facing the clamper insertion portion.

Abstract: A holographic recording method includes the following steps: irradiating an optical recording medium with a coherent reference beam and a coherent information beam to produce a hologram in the optical recording medium while irradiating the optical recording medium with an incoherent pretreatment beam to consume a polymerization inhibitor; irradiating the hologram with the reference beam to extract a reproduction beam while stopping irradiating the optical recording medium with the reference beam; sensing the signal beam with an image pick-up unit to detect an intensity of the signal beam; and calculating a bit error rate with a control unit to irradiate the hologram with the information beam if the bit error rate is larger than a prescribed value, or to stop irradiating the optical recording medium with the reference beam, the information beam and the pretreatment beam if the bit error rate is smaller than the prescribed value.

Abstract: A laser converging apparatus includes a polarizing hologram element having a first area defined by a numerical aperture corresponding to a thickness of a first protective layer of a first disk medium and a second area inside the first area, the second area defined by a numerical aperture corresponding to a thickness of a second protective layer (>the thickness of the first protective layer) of a second disk medium. A wavelength selecting nonpolarizing hologram element has a third area defined by a numerical aperture corresponding to a thickness of a third protective layer (>the thickness of the first protective layer) of a third disk medium. The laser converging apparatus also includes an objective lens having the numerical aperture corresponding to the thickness of the first protective layer, and a holder that holds the polarizing hologram element, the nonpolarizing hologram element, and the objective lens.

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: This document relates to an optical disk drive RAID driving method. In an embodiment of this document, data to be suited for a RAID level is transformed and stored in a buffer area allocated in a storage and the data stored in the buffer area is distributively recording in a plurality of optical disks through a plurality of optical disk drives according to the RAID level.

Abstract: An integrated disk driving module is disclosed, the module including a base unit including a spindle motor fixture including an opening-formed upper plate, a lateral surface plate bent from the upper plate to form an accommodation space, and a spindle motor fixture concavely formed from the upper plate toward the accommodation space, wherein the spindle motor fixture is integrally formed with the upper plate; and a spindle motor fixed inside the spindle motor fixture to rotate a disk.

Abstract: Method and apparatus for writing repeating patterns of features to a substrate, such as a data storage medium. In accordance with some embodiments, a multi-dimensional pattern of discrete features of different sizes to be written to a substrate is divided into a plurality of contiguous regions. A unique set of compensation values is assigned to each region. A write beam of a write system is used to write the features to the substrate responsive to said unique sets of compensation values so that all of the features having a common size in at least one region are written using the same compensation values from the associated set.

Abstract: The present disclosure improves tracking characteristics of an envelope detected from an input signal to the input signal. A detector, which obtains an output signal from an input signal containing a target signal, and outputs the output signal, includes: a comparator configured to compare the input signal to the output signal, and output an obtained comparison result; and an envelope generator configured to weight a first value and a second value having a sign opposite to that of the first value in accordance with the comparison result, integrate the weighted first value and the weighted second value, and output an integral value as the output signal. The envelope generator includes a first gain generator configured to output the first value in accordance with an amplitude of the input signal.

Abstract: Universal multimedia distribution, storage, and playback systems, devices, and methods are disclosed herein. A media distribution kiosk located at a retail establishment provides a user with access to a multitude of different forms of digital multimedia that may be purchased and downloaded onto a portable media transporter device. The kiosk includes a non-volatile storage means capable of HTTP communications, allowing multiple kiosks to share and balance storage resources within a storage cloud. Metadata tagging of stored digital media provides object-based storage, allowing efficient search and retrieval of digital media. A media player and a portable media transporter device are capable of directly accessing the kiosk cloud storage to access the media stored thereon. Information from social networking utilities may be incorporated into the stored digital media metadata to influence ratings and performance metrics.

Abstract: An optical pickup device that can reduce interlayer crosstalk, without changing the configuration of the optical system, and without excessively increasing the size of the optical system. The optical pickup device reproduces a signal from a multilayered optical information recording medium having a plurality of information recording layers. The optical pickup device uses a collimating lens unit as a collimating optical system that collimates light from a light source, and the collimating lens unit includes a first and second lens group arranged at a predetermined distance from each other so as to form a converged light spot in the interior of the collimating lens unit, and an optical element provided between the first lens group and the second lens group so as to form a light spot at a position defocused from the position of the converged light spot, thereby decreasing quantity of light passing through the collimating lens unit.

Abstract: A recording medium on which a recording/reproducing unit block is recorded, an apparatus to record and/or reproduce data on/from the recording medium, and a method of recording/reproducing the data on/from the recording medium. The recording/reproducing unit block comprises invalid data used in disc certification, and an identifier to indicate that the invalid data is included in the recording/reproducing unit block, the invalid data being used during the disc certification on a portion of the recording medium or the entire recording medium.

Abstract: Detection is made as to at least one of a ratio between a tracking error and a focus error, and a duty cycle of an off-track signal with respect to an optical disc. A decision is made as to whether or not the optical disc is playable on the basis of the detected at least one of the ratio and the duty cycle. The ratio is a ratio of the focus error to the tracking error or a ratio of the tracking error to the focus error.

Abstract: In an information storage device in which small partitions for storing information are three-dimensionally placed inside a solid, the invention aims at long-period storage, robustness, and rapid information reading. Accordingly, the stored three-dimensional information is divided into two-dimensional data for each layer, and two-dimensional inverse Fourier transform is previously applied for the two-dimensional data. The two-dimensional data is recorded in each layer in a Z direction inside a storage medium which is solid. When the information is reproduced, electromagnetic waves are irradiated to a storage area MA as gradually rotating the storage area MA around a z axis, and projection images of all layers during the rotation are obtained from response. By applying one-dimensional Fourier transform for a plurality of projection images obtained as described above, the recorded original three-dimensional information is rapidly reproduced.

Abstract: A laser attachment device of the present invention is formed of a LD package and a LD holder housing it. A first inner wall of the LD holder to come into contact with a side surface of the LD package is an inclined surface. This allows the facing direction of the LD package to be corrected by the first inner wall being the inclined surface, even when a laser beam emitted from a light emitting chip housed in the LD holder is inclined with respect to an optical axis. Thus, the traveling direction of the laser beam is corrected to the optical axis side.

Abstract: The present invention enables a comprehensive evaluation from both of data read from a disk and a servo signal of a servo controller. The present invention provides a semiconductor integrated circuit mountable to a disk recording and reproducing drive, which comprises a signal processor of an RF signal read from a pickup, a servo controller responsive to a servo error signal read from the pickup, a memory controller, and an external interface. The memory controller is supplied with read data and a servo signal and stores the read data and the servo signal in a buffer memory according to a time division process. The read data and the servo signal stored in the buffer memory can be transferred to an external device via the external interface by the memory controller.

Abstract: An optical beam forming apparatus capable of forming a polarization of laser beam into an elliptic polarization includes a beam source to emit a semiconductor laser beam, a wave plate to receive the beam emitted from the beam source and to form an elliptic polarization, and a lens to focus the beam passed through the wave plate to form a beam spot on a disc.

Abstract: An optical recording medium including recording and reading layers and a servo layer increases the recording capacity thereof. In the optical recording medium including the plurality of recording and reading layers and the servo layer, the servo layer has a groove and a land that can be used to perform tracking control with a long-wavelength servo beam. Information is recorded on the recording and reading layers with a recording and reading beam having a wavelength shorter than the wavelength of the servo beam. Recording marks are formed on the recording and reading layers while both the groove and land are tracked.

Abstract: A long seeking control method, for an optical information reproduction/recoding system having a lens and a sledge, includes: obtaining a sledge estimation velocity, a sledge estimation displacement, a sledge reference velocity and a first force applied to the sledge; determining to generate the sledge estimation velocity and the sledge estimation displacement in a first open loop control or in a first close loop control based on the sledge estimation velocity; determining to generate the a second force applied to the lens in a second open loop control or in a second close loop control based on the sledge estimation velocity; and pushing the sledge and the lens by the first force and the second force.

Abstract: In a laser attachment device of the preferred embodiment of the invention, a pair of protruding portions are formed on a seating surface of a LD holder by which the position of a CAN package is fixed. The CAN package inserted in a through-hole comes into contact with the pair of protruding portions, and then is fixedly bonded to the inside of the LD holder while being inclined with the protruding portions being the starting point of the inclination. This structure allows the luminance adjustment of a laser beam to be performed without causing displacement of the emitting direction of the laser beam from an optical axis of an optical pick-up device. Thus, the laser attachment device having an improved workability and being suitable for mass production is achieved.

Abstract: According to one embodiment, an optical recording medium is provided in which interlayer crosstalk is low and in which stable and high-quality recording characteristics can be obtained. To this end, an optical recording medium comprises a first recording part which includes a first recording layer and a first light reflecting layer and which is disposed on a side closer to a light receiving surface, and a second recording part which includes a second recording layer and a second light reflecting layer and which is disposed on a side farther from the light receiving surface, the first recording part and the second recording part being stacked, wherein the thickness of the second light reflecting layer is larger than the thickness of the first light reflecting layer.

Abstract: According to one embodiment, an optical recording medium is provided in which interlayer crosstalk is low and in which stable and high-quality recording characteristics can be obtained. To this end, an optical recording medium comprises a first recording part which includes a first recording layer and a first light reflecting layer and which is disposed on a side closer to a light receiving surface, and a second recording part which includes a second recording layer and a second light reflecting layer and which is disposed on a side farther from the light receiving surface, the first recording part and the second recording part being stacked, wherein the thickness of the second light reflecting layer is larger than the thickness of the first light reflecting layer.

Abstract: An aspect of the present invention relates to an optical information recording medium comprising a recording layer, wherein the recording layer comprises a cationic dye and a polynuclear azo metal complex dye comprising an azo dye and a metal ion, and a method of recording information comprising recording information on the recording layer comprised in the optical recording medium, and conducting the recording by irradiation of a laser beam having a wavelength of equal to or shorter than 440 nm onto the optical information recording medium. Another aspect of the present invention relates to a photo sensitizer.