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| Number | Title | Issue Date |
| 5886798 | Information carriers with diffraction structures An information carrier has at least one diffraction pattern which is formed from microscopically fine relief structures and which, upon being illuminated with coherent light, produces in two spatially separate directions, a first and a second image of an ... | 03/23/1999 |
| 5877875 | Reference beam auto-focus apparatus for modularized volume-holographic memory In a method for addressing holograms stored in a plurality of separate storage media, a reference beam is directed to a selected one of the plurality of storage media, the reference beam is then focused so as to obtain a substantially flat wavefront withi... | 03/02/1999 |
| 5856048 | Information-recorded media and methods for reading the information The invention is directed to an information-recorded medium with easily selectable and identifiable items of information, which is virtually protected against forgery and has enhanced security against some improper use, and a method for reading such a med... | 01/05/1999 |
| 5852504 | Stereoscopic display method of hologram and its forming method and its stereoscopic display apparatus A hologram of a virtual object or an object which actually exists is formed and a solid image is displayed. 3-dimensional information of the object to be displayed is divided into regions in the depth direction. Depth images are formed as 2-dimensional im... | 12/22/1998 |
| 5844701 | System and method using linear translation to access data locations in a holographic memory Systems and methods for steering a complex, spatially-modulated incident beam of light from a spatial light modulator to gain access to data locations in a holographic memory cell (HMC). One of the systems includes (1) a primary beam steering system that ... | 12/01/1998 |
| 5844700 | Spatio-angular multiplexing geometry for volume holographic storage Partially overlapping holograms are stored in a cylindrical volume holographic storage medium capable of rotation about and translation along its longitudinal axis. The reference and signal beams are mutually perpendicular, and each is perpendicular to th... | 12/01/1998 |
| 5812292 | Optical correlator using optical delay loops An optical correlator is disclosed that compares signals of interest with lected reference signals stored in holograms. The holograms are arranged so that the selected reference signals impinge onto the plane of the entrance of fiber optics arranged with ... | 09/22/1998 |
| 5808776 | Process for realization of an optically variable image Method for the production of an optically variable image including an animated element used as the model for the reproduction of a security element, by insolation of a light-sensitive material through two coherent light beams. The image is broken down int... | 09/15/1998 |
| 5808998 | Bit error rate reduction by reducing the run length of same-state pixels in a halographic process Bit error rate of an output data stream, reconstructed from a holographic recording, is reduced by reducing the length of same-state pixels on the spatial light modulator.... | 09/15/1998 |
| 5796500 | Methods and apparatus for making holograms A method and apparatus (300) for making holograms includes a technique for exposing a film substrate (319) or other light sensitive medium to consecutive two-dimensional images, together representative of a three-dimensional system, to generate a three-di... | 08/18/1998 |
| 5760933 | Stereoscopic display apparatus and method In a method and apparatus for displaying a stereoscopic image, a plurality of 2-dimensional images having parallaxes in only horizontal directions are obtained and inputted when an object to be displayed is seen from different positions in the horizontal ... | 06/02/1998 |
| 5754318 | Apparatus for parallel recording of holograms in a dynamic volume medium Apparatus for the simultaneous parallel recording of holograms on a dynamic volume medium. Directed along a recording axis is a polychromatic source image which has multiple component images to be recorded in the dynamic volume medium. Each component imag... | 05/19/1998 |
| 5748347 | Image recording medium and method of making same A product, method, and apparatus are provided for making a stereoscopic hologram from a series of two-dimensional views of an object. The two-dimensional views are obtained from, for example, computer analysis of scans taken by standard medical diagnostic... | 05/05/1998 |
| 5739930 | Display apparatus In a display section, a plurality of pixels of minimum display units to display a hologram phase distribution are arranged to thereby construct a cell to display one pixel of a 2-dimensional image, and cells are further two-dimensionally arranged to there... | 04/14/1998 |
| 5734485 | Large display composite holograms and methods A composite hologram incorporates a plurality of hologram tiles arranged for display, each of the hologram tiles formed by exposing each of a plurality of different unexposed photographic plates simultaneously to light scattered by an intermediate hologra... | 03/31/1998 |
| 5724161 | Holographic information display for exterior vehicle application Apparatus comprising a decal disposed on an interior surface of a window and a light source for projecting light onto the to display an image outside of the vehicle. The decal comprises a protective layer having a hologram layer disposed thereon that is d... | 03/03/1998 |
| 5724162 | Optical correlator using spatial light modulator An optical correlator is disclosed that compares signals of interest agai selected reference signals stored in holograms both of which are imaged onto a spatial light modulator comprising electron trapping material. The cooperative action of the light fr... | 03/03/1998 |
| 5719691 | Phase correlation multiplex holography Holograms within an array are recorded and/or read out by use of a reference/read out beam produced by illumination of a phase mask.... | 02/17/1998 |
| 5717508 | Method for dynamically refreshing angle-multiplexed holograms in photorefractive media A method and system are disclosed for dynamically refreshing angle-multiplexed holograms stored in a photorefractive medium. In accordance with the invention the photorefractive medium is simultaneously exposed to a plurality of reference beams. Each refe... | 02/10/1998 |
| 5717509 | Stereoscopic display method of hologram and its forming method and its stereoscopic display apparatus A hologram of a virtual object or an object which actually exists is formed and a solid image is displayed. 3-dimensional information of the object to be displayed is divided into regions in the depth direction. Depth images are formed as 2-dimensional im... | 02/10/1998 |
| 5703705 | Tilt multiplex holography A system for high density holographic storage announced by Cal Tech is improved. The basic Cal Tech system records successive holograms by physically shifting the recording medium relative to the paired reference and signal beams. By depending on Bragg se... | 12/30/1997 |
| 5691989 | Wavelength stabilized laser sources using feedback from volume holograms A laser utilizes feedback from a volume holographic grating used as a wavelength standard to lock the laser output wavelength to its desired value. This feedback can be non-optical, wherein the holographic filter output is used to actively control the wav... | 11/25/1997 |
| 5684611 | Photorefractive systems and methods A new type of holographic recording in photorefractive crystals is disclosed, termed orthogonal data storage, in which counterpropagating, reflection mode holograms are wavelength multiplexed to form gratings lying along a common axis. It is shown that th... | 11/04/1997 |
| 5684588 | Homodyne and hetrodyne imaging in a light scattering medium Image derogating optical noise due to light scattering of an object under amination, embedded in, or positioned in front of a light scattering medium, is substantially reduced by employing a two-dimensional all optical phase sensitive holographic detector... | 11/04/1997 |
| 5680231 | Holographic lenses with wide angular and spectral bandwidths for use in a color display device The angular and/or spectral bandwidth of a holographic lens assembly can be widened to accomodate highly diverging and/or wide spectral bandwidth illumination sources, respectively. Each lens in the lens assembly is comprised of a plurality of angularly c... | 10/21/1997 |
| 5675437 | Light control film for use in viewing holograms and related method An apparatus for reconstructing holographic images includes a white light source, diffraction grating (1112) for generating zero-order diffracted light (1416) and at least first-order diffracted light, and light control film (LCF 1810) which is configured... | 10/07/1997 |
| 5672448 | Multi-exposure system for hologram A hologram forming system for forming holograms on multiple exposures is provided. In this system, a holographic recording medium is exposed to light beams at least twice at incident angles different between exposures. The incident angle during each expos... | 09/30/1997 |
| 5671073 | Holographic storage using shift multiplexing The invention is embodied in a method of recording successive holograms in a recording medium, using at least a fan of M waves along at least a first axis with a separation angle between adjacent waves and directing the fan of M waves as a reference beam ... | 09/23/1997 |
| 5663816 | Liquid crystal display device comprising reflective holographic A liquid crystal display device (30) that is illuminatable by diffuse ambient light comprises a liquid crystal panel (32) and a reflective holographic optical element (34). Diffuse ambient light illuminating the front side (36) of the liquid crystal panel... | 09/02/1997 |
| 5661577 | Incoherent/coherent double angularly multiplexed volume holographic optical elements Novel multiplexed volume holographic optical elements for the development of highly multiplexed photonic interconnection and holographic memory systems with maximum optical throughput efficiency and minimum crosstalk, based on parallel incoherent/coherent... | 08/26/1997 |
| 5652666 | Holographic 3-D display system with spatial light modulator A method of using a display system having a spatial light modulator (14) to display holographic images. The spatial light modulator (14) generates images that represent vertical strips of a hologram. These images are de-magnified by a three-dimensional op... | 07/29/1997 |
| 5650247 | Preparation and reproduction of filters and preparation of filter photographic materials The preparation of a filter comprises illuminating a photographic material and a mask located at a given distance therefrom with light from the opposite directions to make a hologram and then reproducing an reproduced image of said hologram in the photogr... | 07/22/1997 |
| 5646753 | Display system A display system arranged closer than the focus point of the eyes. The display system comprises a hologram carrier for generating a virtual image by a hologram of a pixels' image arranged in two dimensions a light source for directing an incident light of... | 07/08/1997 |
| 5644414 | Stereoscopic display method of hologram and its forming method and its stereoscopic display apparatus A hologram of a virtual object or an object which actually exists is formed and a solid image is displayed. 3-dimensional information of the object to be displayed is divided into regions in the depth direction. Depth images are formed as 2-dimensional im... | 07/01/1997 |
| 5627664 | Holographic storage with combined orthogonal phase codes and random phase codes A method and apparatus for holographic storage with combined orthogonal phase codes and random phase codes are provided in which a reference beam (18) is encoded with a combination orthogonal phase code and random phase code by a phase encoder (28). A dat... | 05/06/1997 |
| 5621549 | Method and apparatus for positioning a light beam on a holographic media An apparatus for positioning a data and reference beam onto the surface of a holographic storage media (10) includes a laser (16) for generating the reference beam, and a first reflecting surface (18) for positioning the output of the laser (16) along the... | 04/15/1997 |
| 5594564 | Space light modulating apparatus having a length to width ratio of 30:1 and staggered drivers A space light modulating apparatus suitable for reconstruction of an electronic 1-dimensional hologram having no movable section. A predetermined display region is divided into a plurality of stripe-like regions each having a screen width Lx in... | 01/14/1997 |
| 5592313 | Methods and apparatus for making holograms A method and apparatus for making holograms includes a technique for exposing a film substrate or other light-sensitive medium to consecutive two-dimensional images, together representative of a physical three-dimensional system, to generate a three-dimen... | 01/07/1997 |
| 5589957 | Stereoscopic display apparatus using cylindrical screen A diffraction light modulated by a plane type phase distribution display device is deflected by an image formation optical system and is formed as an image onto a cylindrical screen surface and is diffused in the vertical direction by a unidirectional lig... | 12/31/1996 |
| 5581378 | Electro-optical holographic display A display device which is capable of producing a plurality of different views of an image simultaneously is provided. The display includes an array of semiconductor devices with an electro-optical material disposed over the array of semiconductor devices.... | 12/03/1996 |
