Class / Patent application number | Description | Number of patent applications / Date published |
369109010 | Diffractive storage medium information element | 31 |
20080225672 | Methods For Manufacturing Volume Bragg Grating Elements - Methods for recording volume Bragg grating structures having a target wavelength are disclosed. Such a method may include providing a photosensitive recording medium, bringing a first face of the recording medium into contact with a face of a prism, the prism being made of a material that is transparent at a recording wavelength, and recording a Bragg grating onto the recording medium by exposing the prism to an incident light wave at the recording wavelength. | 09-18-2008 |
20080247295 | FIRST-SIDE DUAL-LAYER OPTICAL DATA STORAGE DISK AND METHOD OF MANUFACTURING THE SAME - An optical data storage disk includes a central substrate and on each side of the substrate a pair of metal/alloy recording layers separated by a transparent layer. | 10-09-2008 |
20080267041 | OPTICAL SIGNAL RECORDING MEDIUM AND INFORMATION RECORDING/REPRODUCING APPARATUS - An optical signal recording medium includes at least one signal recoding plane in which an optical signal is to be recorded, and a control information region which is a portion other than the signal recoding plane, and in which a diffraction grating is disposed. | 10-30-2008 |
20090016190 | METHOD AND SYSTEM FOR FUNCTION-SPECIFIC TIME-CONFIGURABLE REPLICATION OF DATA - The system and method of the invention provides for function-specific replication of digital data, such as files or objects, with a configurable time delay for each function to be replicated. The system includes a source storage system from which digital data is to be replicated, a destination storage system(s) to which the digital data is being replicated, a replication management module for managing the function specific replication delay and the data replication between the source storage systems and the destination storage system(s). | 01-15-2009 |
20090052302 | Recording Apparatus and Recording Medium, and Computer Program - A recording apparatus includes: a recording device for recording data onto each of a plurality of types of recording media by irradiating a light beam corresponding to each of the types of recording media; a diffracting device disposed on an optical path of the light beam from the recording device to the recording medium, for generating a main beam and a plurality of sub beams by diffracting the optical beam, the main beam recording data and performing a tracking process, the sub beams performing the tracking process, an amplitude of a tracking signal generated by each or one portion of the sub beams and by the main beam being maximum; a controlling device for controlling the diffracting device to adjust a position on which each of the plurality of sub beams is focused, in accordance with the type of the recording medium; and a tracking device. | 02-26-2009 |
20090059764 | OPTICAL INFORMATION RECORDING MEDIUM AND RECORDING FILM FOR OPTICAL INFORMATION RECORDING MEDIUM - Disclosed herein is an optical information recording medium and a recording film for the optical information recording medium, which are capable of readout of short recording marks at a higher C/N ratio than the conventional BD (as in the case of the Super-RENS disk) by means of the same readout power as for the conventional BD, which is lower than that for the Super-RENS disk (or the conventional BD). To be specific, the readout power is 0.3 mW, the short recording marks have a length of 149 nm, and the C/N ratio is no less than 45 dB. | 03-05-2009 |
20090086608 | INFORMATION RECORDING MEDIUM AND METHOD FOR MANUFACTURING SAME - An information recording medium of the present invention includes N information layers on a substrate ( | 04-02-2009 |
20090103417 | OPTICAL PICKUP DEVICE AND INFORMATION RECORDING/REPRODUCING APPARATUS - There are obtainable reliable and proper tracking correction and CTC even when fluctuations occur in an irradiation position of a sub-beam in a track at the time of performing tracking correction and CTC using three beams. Five beams (a main beam, sub-beams inA and inB, and sub-beams outA and outB) are generated. Reflection beams of the five beams are received, and a differential push pull signal DPPin corresponding to the sub-beams “in” as ± first-order beams and a differential push pull signal DPPout corresponding to the sub-beams “out” as ± second-order beams are generated. By assigning weights to the differential push pull signals DPPin and DPPout and computing the sum of the weighted signals, a tracking error signal Ste having an amplitude value which can perform tracking correction is generated. | 04-23-2009 |
20090109825 | OPTICAL SCANNING DEVICE - An optical scanning device ( | 04-30-2009 |
20090122684 | Disc Authentication by Grayscale Image in Data Area Obtained by Modulation Rule Variation (Old Title) - The present principles provide a way to place a multilevel grayscale image, visible with the bare eye in the data area of an optical disc. This feature can be used to authenticate a legitimate disc, since the image features are lost when copying a disc either with a PC recording drive or by a pirate creating a data set to be used on a laser beam recorder to produce forged ROM discs. The modulation rules are selectively varied during disc writing in a way to change the distribution of pit/land lengths, so that the at three (3) different diffraction properties are generated, and therefore produce at least three (3) distinct looks to the bare eye. | 05-14-2009 |
20090135704 | RETAINING BODY AND THE LIKE - The present invention provides a retaining body and the like which adjust a diffraction state of a laser beam using a simple configuration. | 05-28-2009 |
20090185471 | Optical Pickup Device and Optical Disc Apparatus - In an optical pickup device, an optical reflection beam from a multi-layer optical disc is divided into a plurality of areas, divided optical fluxes focus upon different positions on a photodetector, a focusing error signal is detected by using a plurality of divided optical fluxes by a knife edge method, and a tracking error signal is detected by using a plurality of divided optical fluxes. The optical flux divided areas and light receiving parts are disposed in such a manner that in an in-focus state of a target layer, stray light from another layer does not enter servo signal light receiving parts of the photodetector. It is therefore possible to obtain stable servo signals including both the focusing error signal and tracking error signal during recording/reproducing a multi-layer optical disc, without being influenced by stray light from another layer. | 07-23-2009 |
20090185472 | Objective Optical System and Optical Information Recording/Reproducing Device Having the Same - There is provided an objective optical system used for information recording/reproducing for three types of optical discs. The objective optical system includes an objective lens, and a diffraction structure formed on an optical surface. The diffraction structure includes a first area for contributing to converging the third light beam. The first area includes first and second steps defined by first and second optical path difference functions, respectively. The first step is configured such that diffraction orders at which diffraction efficiencies for the first, second and third light beams are maximized are 1 | 07-23-2009 |
20090196146 | OPTICAL PICKUP APPARATUS - An optical pickup apparatus comprising: a diffraction grating that a laser beam enters, the diffraction grating being configured to generate a main beam that is 0th order light and sub-beams that are +1st order diffracted light and −1st order diffracted light; an objective lens configured to focus the main beam and the sub-beams onto a signal recording layer; a main-beam light-receiving portion that the main beam reflected by the signal recording layer is applied to; and sub-beam light-receiving portions that the sub-beams reflected by the signal recording layer are respectively applied to, each light-receiving area of the sub-beam light-receiving portions being smaller than a light-receiving area of the main-beam light-receiving portion. | 08-06-2009 |
20090285076 | Diffractive optical element and method of designing the same - A transmissive or reflective diffractive optical element, comprising: a substrate having a top surface, the top surface being etched into a pattern, the pattern including a periodic surface pattern of grooves formed such that when an incoming light beam is shone onto the top surface, the incoming light beam will be split into a plurality of diffracted light beams, the plurality of diffracted light beams including a plurality of primary diffracted order beams and a plurality of secondary diffracted order beams, wherein the primary diffracted order beams have a primary aggregate efficiency above ninety percent, wherein the plurality of secondary diffracted order beams have a secondary aggregate efficiency of lower than ten percent, and wherein a maximum power of the primary diffracted order beams and a minimum power of the primary diffracted order beams differ by at least ten percent of an average power of the primary diffracted order beams. | 11-19-2009 |
20090290473 | OPTICAL HEAD DEVICE AND OPTICAL INFORMATION RECORDING OR REPRODUCING APPARATUS WITH THE SAME - [Problems] An optical head device and an optical information recording or reproducing apparatus are provided to detect an excellent track error signal for two-layer optical recording medium. | 11-26-2009 |
20100008207 | Method and Apparatus for Optical Power Transfer Control - A method and apparatus involve: supporting an optical part for movement in relation to a first path of travel of radiation; moving the part successively to first and second positions in which radiation arriving along the first path of travel passes respectively through first and second sections of the part that provide respective different levels of refraction, the first and second sections causing radiation to thereafter travel along respective second and third paths of travel; and receiving at an output first and second portions of radiation respectively propagating along the second and third paths of travel, the first and second portions containing different amounts of optical energy. | 01-14-2010 |
20100020670 | OPTICAL PICKUP DEVICE, OPTICAL DISC DEVICE, AND DIFFRACTION GRATING - An optical pickup device and an optical recording/reproduction device are provided that can suppress a tracking error signal offset generated in the boundary between an unrecorded area and a recorded area. A three-beam diffraction grating is divided into two areas. A division line that divides the diffraction grating into two areas has a step in the direction almost vertical to a groove period structure, and the part of the division line in the step has a staircase shape. The phase difference in the groove period structures between one area and the other area, separated by the division line, is about 180 degrees. | 01-28-2010 |
20100027402 | OPTICAL HEAD DEVICE AND OPTICAL DISC APPARATUS - An optical head device includes: a diffraction unit including a plurality of diffraction portions each diffracting a incident light in a given direction, the light beam being reflected by an optical disc; and a photodetection unit including a plurality of photodetectors each outputting a signal corresponding to an intensity of an irradiated light, wherein the photodetectors include at least two first photodetectors for generating a compensation value to compensate a tracking error signal, and wherein the diffraction portions include at least two first portions for focusing the incident light into the first photodetectors. | 02-04-2010 |
20100097917 | DIFFRACTIVE OPTICAL ELEMENT AND OPTICAL PICKUP - An optical pickup with a simplified structure in which, according to the type of optical disc, diffracted light from three types of laser light can be directed efficiently onto a photodetector and appropriate focus control can be performed based on the signals detected by the photodetector, and a diffractive optical element that can be used in the optical pickup, which has a semiconductor laser | 04-22-2010 |
20100118683 | Devices And Methods For A Micro-Fresnel Zone Plate Optical Device - An embodiment generally relates to an optical device suitable for use with an optical medium for the storage and retrieval of data. The optical device includes an illumination means for providing a beam of optical radiation of wavelength λ and an optical path that the beam of optical radiation follows. The optical device also includes a diffractive optical element defined by a plurality of annular sections. The plurality of annular sections having a first material alternately disposed with a plurality of annular sections comprising a second material. The diffractive optical element generates a plurality of focal points and densely accumulated ray points with phase contrast phenomena and the optical medium is positioned at a selected focal point or ray point of the diffractive optical element. | 05-13-2010 |
20100135143 | OPTICAL SYSTEM, OPTICAL PICKUP APPARATUS, AND OPTICAL DISC APPARATUS FOR EXTRACTING SIGNAL BEAMS - An optical system for efficiently extracting plural signal beams from a bundle of rays reflected from a multilayer optical disc. | 06-03-2010 |
20110261671 | REPRODUCTION APPARATUS AND REPRODUCTION METHOD - In case of reproducing a hologram recorded on an optical information recording medium, adjusting beam with the amplitude distribution and phase distribution at least partially the same as those of a signal beam upon recording is radiated to the optical information recording medium which records information. The diffracting beam diffracted by the hologram is detected by a photodetector. Based on the detected information, an incident angle of the reference beam to the optical information recording medium is appropriately controlled. | 10-27-2011 |
20120106310 | OPTICAL HEAD DEVICE AND OPTICAL DISC DEVICE - An optical head device mounted in an optical disc device. The optical head device is provided with a diffractive optical element and a photodetector. The diffractive optical element has: a primary diffraction region at a location on which the positive and negative first-order components and some of the zero-order component of a reflectively diffracted light beam are incident; and secondary diffraction regions at locations on which the rest of the zero-order component but none of the positive or negative first-order components of the reflectively diffracted light beam are incident. A main light-receiving section of the photodetector receives the zero-order component of a transmissively diffracted light beam that has passed through the primary diffraction region and the secondary diffraction regions. Secondary light-receiving sections receive the positive first-order component and/or the negative first-order component of the transmissively diffracted light beam that has passed through the secondary diffraction regions. | 05-03-2012 |
20120250486 | METHOD AND APPARATUS FOR READING FROM AND/OR WRITING TO AN OPTICAL RECORDING MEDIUM - A method and an apparatus for reading data from or writing data to an optical recording medium is described, the data being stored as marks having different lengths. Marks having a length below the limit of diffraction at a first wavelength are read or written with the first wavelength, whereas marks having a length above the limit of diffraction at the first wavelength are read or written with a second wavelength larger than the first wavelength. | 10-04-2012 |
20130016597 | OPTICAL PICKUP APPARATUSAANM Fukumoto; SatoruAACI OsakaAACO JPAAGP Fukumoto; Satoru Osaka JPAANM Murakami; ShinzohAACI OsakaAACO JPAAGP Murakami; Shinzoh Osaka JP - An optical pickup apparatus is provided. Segmented regions included in a focus diffraction region includes focus segmented regions corresponding in number with different light emitted by a light source. Different focus segmented regions are arranged adjacent to each other alternately in a direction perpendicular to a parallel dividing line. Segmented regions included in a tracking diffraction region includes tracking segmented regions corresponding in number with different light emitted by the light source. Different tracking segmented regions are arranged adjacent to each other alternately in a direction perpendicular to the parallel dividing line. | 01-17-2013 |
20130135980 | SIX-DIMENSIONAL OPTICAL STORAGE METHOD AND APPARATUS - The invention relates to a method of optical six-dimensional data storage and the apparatus based on it. This invention uses multiple beams with different wavelengths, encoded intensities and polarizations to create each group of multiple wavelength selective, reflectivity specified and polarization sensitive tiny plane or quasi-plane Bragg reflectors in a small volume crossing through multiple storage medium layers as each storage cell. The maximum storage capacity can over 10 Terabytes per disk with fast data write, read and erase speeds. In addition, the apparatus based on this method has no interlayer noise and disk rotation caused data recoding and reading quality loss, and has good compatibility with existing CD and DVD disks. | 05-30-2013 |
20130336100 | OPTICAL INFORMATION RECORDING MEDIUM, AND SUBSTRATE AND MANUFACTURING METHOD FOR THE OPTICAL INFORMATION RECORDING MEDIUM - In an optical disk including at least a rewritable phase change material and comprising a recording layer having a reflectivity of more than 15%, an address output value as an address pit signal component occupying in a reproduced signal in a non recording state is prescribed to be 0.18 though 0.27 or a numerical aperture of an address pit signal occupying in a reproduced signal in a non recording state is prescribed to be more than 0.3. | 12-19-2013 |
369109020 | Plural elements with distinct diffractive characteristics | 3 |
20080253258 | Information recording medium and method of reading information from information recording medium, and image detection apparatus - In an information recording medium according to the present invention, in which an information recording medium has diffraction grating cells arranged therein, a plurality of types of the diffraction grating cells make up one information recording area. At least one type of the diffraction grating cells included in the diffraction grating cells making up the information recording area are information recording elements, while the other types of the diffraction grating cells included in the diffraction grating cells making up the information recording area are information hiding elements. The information is recorded by two-dimensional arrangement of the diffraction grating cells constituting the information recording elements in the information recording area. | 10-16-2008 |
20090022032 | Optical Pickup Unit and Optical Disk Apparatus - An optical pickup unit comprises a diffraction grating that divides light into at least three luminous fluxes and condenses the three luminous fluxes to apply at least three focusing spots, independent of each other, onto a signal side of a medium. The diffraction grating is divided into at least four regions, a first region, a second region, a third region, and a fourth region. | 01-22-2009 |
20130315047 | OPTICAL INFORMATION RECORDING/REPRODUCING APPARATUS AND OBJECTIVE OPTICAL SYSTEM FOR THE SAME - An objective optical system for information recording/reproducing, at least one of optical surfaces of the objective optical system comprising a diffraction surface including a first region contributing to converging first, second and third beams and including a diffraction structure formed such that use diffraction orders for the first, second and third beams are 1st-orders and a condition 0.03<(λB | 11-28-2013 |