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| Number | Title | Issue Date |
| 7365657 | Data identification method and apparatus A data identification method including: a first step; a second step; a third step; and a fourth step, and the third and fourth steps being repeated until an identification result included in the table of recording modulation codes is obtained at the third step. ... | 04/29/2008 |
| 7365656 | Data identification method and apparatus Disclosed herein is a data identification method for identifying, from within a readout signal from a recording medium on or in which user data of k bits are recorded using a recording modulation code wherein m bits from among n bits which compose one codeword have ... | 04/29/2008 |
| 7330292 | Complex objective lens, optical head, optical information apparatus, computer, optical disk player, car navigation system, optical disk recorder, and optical disk server A complex objective lens composed of a hologram and an objective lens, capable of realizing stable and high-precision compatible reproducing/recording of a BD with a base thickness of about 0.1 mm for a blue light beam (wavelength λ1) and a DVD with a base t... | 02/12/2008 |
| 7283286 | Hologram recording/reproducing device and optical unit A hologram recording/reproducing device includes a laser light source emitting laser light; a spatial light modulator generating signal light and reference light from the laser light emitted from the laser light source, the signal light and the reference light trave... | 10/16/2007 |
| 7277211 | Hologram recording and reproduction apparatus, hologram recording and reproduction method and hologram recording medium An apparatus and method is disclosed wherein, even if the multiplicity in multiplexing of recording data is increased, positioning of data upon reproduction can be performed with a high degree of accuracy without decreasing the recording capacity. Interference fring... | 10/02/2007 |
| 7262893 | Data read/write device for holographic WORM and method thereof A data writing and reading device is capable of writing and reading data with respect to a holographic storage medium. The data writing and reading device includes a light source which emits a laser beam, a focusing lens unit having a multi-focal lens which splits t... | 08/28/2007 |
| 7245408 | Systems and methods for producing wide field-of-view holographic displays Hologram recording devices and techniques can be employed to produce wide-field-of-view holograms. In one embodiment, a specialized lens is used to couple an object beam into a holographic recording material without substantially changing the angle of incidence of t... | 07/17/2007 |
| 7245407 | Complex objective lens compatible with information media of different thicknesses A complex objective lens composed of a hologram and an objective lens, capable of realizing stable and high-precision compatible reproducing/recording of a BD with a base thickness of about 0.1 mm for a blue light beam (wavelength λ1) and a DVD with a base t... | 07/17/2007 |
| 7206105 | Hologram recording device and hologram reproduction device A hologram record apparatus (100) includes a spatial light modulator (15) and a control device (18). The spatial light modulator (15) is arranged on an optical path of signal light (L1) and divided into a plurality of cell blocks (... | 04/17/2007 |
| 7193757 | Angle multiplexing holographic storage device and method In an angle multiplexing holographic storage device, a movable beam splitter is used for splitting a source beam into an object beam and a reference beam. An encoding device is used for encoding the object beam with pixel data. A parabolic reflector differentially r... | 03/20/2007 |
| 7167286 | Polytopic multiplex holography Disclosed is a multiplexing method and apparatus that allows holograms to be spatially multiplexed with partial spatial overlap between neighboring stacks of holograms. Each individual stack can additionally take full advantage of an alternate multiplexing scheme su... | 01/23/2007 |
| 7158273 | Holographic data memory A holographic data storage medium has a polymer film which is set up as a storage layer whose refractive index can be changed locally by heating. The polymer film is set up for the storage of optical phase information via the local optical path length of the polymer... | 01/02/2007 |
| 7149015 | Obliquity correction scanning using a prism mirror Disclosed are optical systems and methods of producing obliquity corrected light beams, for example, holographic recording and retrieval systems that utilize an obliquity corrected reference beam. One method includes directing a light beam reflected from a prism mir... | 12/12/2006 |
| 7148969 | Apparatus for direct-to-digital spatially-heterodyned holography An apparatus operable to record a spatially low-frequency heterodyne hologram including spatially heterodyne fringes for Fourier analysis includes: a laser; a beamsplitter optically coupled to the laser; an object optically coupled to the beamsplitter; a focusing le... | 12/12/2006 |
| 7142337 | Method for generating a hologram on a disc surface A method for generating a hologram on a disc surface provides for the use of calibration spots burned onto a disc with an accuracy greater than one half wavelength of light. ... | 11/28/2006 |
| 7092133 | Polytopic multiplex holography Disclosed is a multiplexing method and apparatus that allows holograms to be spatially multiplexed with partial spatial overlap between neighboring stacks of holograms. Each individual stack can additionally take full advantage of an alternate multiplexing scheme su... | 08/15/2006 |
| 7081977 | Angular multiplexing apparatus for holographic storage medium An angular multiplexing apparatus for a holographic storage medium. The angular multiplexing apparatus includes a reconstructing reference beam generator, translated in parallel to a number of positions, for generating a number of reconstructing reference beams whic... | 07/25/2006 |
| 7079296 | Integrated reading and writing of a hologram with a rotated reference beam polarization A method for monitoring diffraction while reading a hologram includes: illuminating a holographic medium with a reference beam to generate a data beam for a hologram that has been recorded at a set diffraction efficiency with a first polarization, the reference beam... | 07/18/2006 |
| 6999397 | Holographic digital data storage system compatible with holographic and reflective medium In a holographic digital data storage system, a light source generates a reference beam, a holographic optical element saves a plurality of interference patterns between the reference beam and a plurality of beams of specific sizes and a beam splitter splits each re... | 02/14/2006 |
| 6925117 | Data transmission apparatus, method and program, data reception apparatus and method, and data transmission and reception system, using differential data A data transmission apparatus and the like are provided which, in sending data of a large capacity such as still image data, can significantly reduce an amount of transmission data while suppressing deterioration of the data. The transmission apparatus of the presen... | 08/02/2005 |
| 6906835 | Doped stoichiometric lithium niobate crystals and method for high-speed holographic data storage The present invention discloses a recording medium comprising an improved doped Stoichiometric Lithium Niobate (SLN) crystal for high-speed holographic data storage. The improved doped SLN has an extremely high optical damage resistance of more than 145 kW/cm2 ... | 06/14/2005 |
| 6904491 | Hybrid data storage system A hybrid data storage system comprising at least one memory system and at least one holographic drive, data being transmitted between the holographic drive and the memory system. At least one holographic drive writes data to a first holographic recording medium, and... | 06/07/2005 |
| 6903853 | Optical head and hologram recording device including the same An optical head comprises an integrated unit for recording and reproducing page data on a reflective recording medium, wherein the integrated unit includes recording and reproducing units each corresponding to a bit of data of the page data, wherein each of the reco... | 06/07/2005 |
| 6894816 | Method and apparatus for recording/reproducing optical information In a holographic digital data storage system, holographic page data has at least two concentric patterns with the optical information arranged within an outermost pattern of at least two concentric patterns. Since at least two concentric patterns in the holographic ... | 05/17/2005 |
| 6831762 | System and method for holographic storage with optical folding A system for recording and reading out holograms in a storage medium including a pattern encoder, a first fourier transform lens with a focal length f1, a second fourier transform lens with a focal length f2, a detector array, and a first and s... | 12/14/2004 |
| 6798547 | Process for holographic multiplexing A method of recording holograms includes: generating a first signal-beam from a signal-beam source and a first reference beam from a reference-beam source; recording a first hologram in a holographic medium from an interference between the first signal beam and the ... | 09/28/2004 |
| 6762865 | Self-referenced holography using diffusive element The invention is directed to self-referenced holographic recording techniques that make use of a diffusive element. Self-referenced holography refers to holographic recording techniques in which a reference beam is created from a zero frequency Fourier component of ... | 07/13/2004 |
| 6710901 | Method and apparatus for two-photon, volumetric spatially resolved holographic data storage in photosensitive glass A method for the generation of volume spatially-resolved holographic data storage within a photosensitive glass sample that incurs changes of optical properties in response to two-photon absorption, the method including directing non-ultraviolet pulsed laser radiati... | 03/23/2004 |
| 6697316 | Compensation of pixel misregistration in volume holographic data storage A method of correcting errors arising from interpixel cross talk in the detection of a reconstructed holographic data image includes determining any misregistration between the pixels and the bit images. The measured output signals are then corrected to c... | 02/24/2004 |
| 6680860 | Optical coherent transient continuously programmed continuous processor Techniques for continuously programming a coherent transient spatial-spectral optical signal processor involve the repeated application of two or more spatially distinct optical programming pulses to a non-persistent hole-burning material to write an accu... | 01/20/2004 |
| 6661725 | Apparatus for storing/restoring holographic data and method for coding/decoding holographic data There is provided an apparatus for storing/restoring holographic data and a method for coding/decoding holographic data. In a recording mode, the apparatus divides input data into a plurality of groups, each of which includes two binary digits; and encode... | 12/09/2003 |
| 6614566 | Process for holography involving skip-sorted hologram storage The invention relates to a skip-sorted spatial multiplexing holographic storage technique that addresses the problems of cross-talk, image distortions, and physical change of the medium encountered in current recording processes in which photopolymer medi... | 09/02/2003 |
| 6347060 | Hologram observation method and hologram observation apparatus and multi-dimensional hologram data processing method and multi-dimensional hologram data processing apparatus Scanning sensor scans on a circumference and simultaneously a radiation wave is received by scanning sensor to generate received signal Sm (f). A radiation wave is received by a fixed sensor at a position not changed with respect to the center ... | 02/12/2002 |
| 6327171 | Digital signal recording/reproducing method Digital signal sequences to be recorded in predetermined unitary recording areas are transformed into blocks, a plurality of bit data carrying all digit levels to be read and determined upon reproduction are included in the resultant blocks, and sequences... | 12/04/2001 |
| 6252686 | Optical pickup device An optical pickup device in which a light beam radiated from a semiconductor laser element is converted by a collimator lens into collimated light beam which is converged by an objective lens so as to be illuminated on an optical disc. A beam shaping elem... | 06/26/2001 |
| 6226109 | Diffractive security device on compact discs This invention relates to marking the genuine CD in an easily detectable way while difficult to counterfeit. The improved CD has within its layers a second structured surface parallel to the flat surfaces of the CD. The second structured surface acts as a... | 05/01/2001 |
| 6222754 | Digital signal recording/reproducing method Digital signal sequences to be recorded in predetermined unitary recording areas are transformed into blocks, a plurality of bit data carrying all digit levels to be read and determined upon reproduction are included in the resultant blocks, and sequences... | 04/24/2001 |
| 6222651 | Holographic resonant system and method A holographic resonant system includes a plurality of volume phase holograms superimposed on a single layer of photosensitive film. The volume phase holograms are oriented with respect to one another such that a first volume phase hologram selects an inco... | 04/24/2001 |
| 6157470 | Non-volatile holographic storage in doubly-doped photorefractive material A non-volatile holographic recording method and system based on a doubly-doped photorefractive material. One embodiment of the holographic material is doped to have first and second types of dopants that are operable to produce charge carriers to a common... | 12/05/2000 |
| 6122081 | Using the Talbot Effect for lensless imaging of periodic structures in a holographic memory system A holographic memory system which utilizes the Talbot Effect for the lensless, near-field propagation of repeating image planes of periodic structures. Periodic phase structures at one plane in a holographic memory system are mapped to the input amplitude... | 09/19/2000 |
