Discrete Hologram Only Patents (Class 359/25)
  • Patent number: 5570208
    Abstract: 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 images where are seen from a plurality of points which are obtained by finely dividing the hologram forming surface for every region. A phase distribution at the hologram forming surface is calculated from the depth images and displayed on a liquid crystal display or the like as an electronic hologram. A reference light is irradiated onto the display and is converted into an optical wave front, thereby displaying a solid image. When forming a hologram recording medium, a zone image corresponding to each of the finely divided exposure regions of a dry plate is exposed multiple times.
    Type: Grant
    Filed: September 25, 1995
    Date of Patent: October 29, 1996
    Assignee: Fujitsu Limited
    Inventors: Masayuki Kato, Hirokazu Aritake, Manabu Ishimoto, Noriko Sato, Masato Nakashima
  • Patent number: 5547786
    Abstract: A method and system for fabricating a multiple holographic element. The method comprises the steps of forming a master multiple holographic element having an absorption grating pattern that produces a given index of refraction pattern across the master multiple holographic element, coating the master holographic element with a layer of a photopolymer, and directing a recording beam to and through the master holographic element and into the photopolymer layer. The absorption grating pattern of the master holographic element modulates the amplitude of the recording beam, and the modulated recording beam causes the monomers of the photopolymer to form a monomer pattern that produces the given index of refraction pattern across the photopolymer layer. The method further comprises the steps of fixing the monomers of the photopolymer layer in that monomer pattern to form thereby a copy of the multiple holographic element, and removing the photopolymer layer from the master holographic element.
    Type: Grant
    Filed: August 22, 1994
    Date of Patent: August 20, 1996
    Assignee: Northrop Grumman Corporation
    Inventors: Robert W. Brandstetter, Nils J. Fonneland
  • Patent number: 5543251
    Abstract: Holographic images are constructed in a recording material in accordance with a temporal interleaving technique in which a first set of images is constructed for a predetermined first imaging time with a predetermined first time gap being defined between each of the images. Thereafter, in accordance with a subsequent predetermined sequence a subsequent set of images is constructed into the same predetermined location. The image sets have at least one member in common. In one aspect all of the images are constructed into the same predetermined defined region of the holographic recording material (an angle hologram). In another aspect the predetermined defined region into which each of the images is constructed is separate from all other regions of the holographic recording material (a spatial hologram).
    Type: Grant
    Filed: June 29, 1990
    Date of Patent: August 6, 1996
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Bradley K. Taylor
  • Patent number: 5537232
    Abstract: A multiple-color filter array (94) useful as part of a flat panel display system of either a projection (50) or direct view (70) type is constructed using reflection holography techniques. The filter array includes multiple-color filter elements (110, 114, 116) that reflect wavelengths of light corresponding to colors outside of a color band of interest. Redundant sets of first, second, and third wavelengths selective reflective color filter elements are arranged in stripes to transmit light of the three primary colors red, green, and blue. The three-color filter array is constructed in a single layer (122) of holographic recording material during one sequence of three separate exposures, one for each color filter element. A preferred flat panel display system (200) includes a liquid crystal variable optical retarder of the supertwisted nematic (STN) type.
    Type: Grant
    Filed: October 5, 1993
    Date of Patent: July 16, 1996
    Assignee: In Focus Systems, Inc.
    Inventor: Jonathan R. Biles
  • Patent number: 5535023
    Abstract: A method of photoelectrically reading information recorded in the form of a Fresnel hologram, which makes it possible to eliminate the effect on the reading accuracy of a scratch, a stain, etc., on the hologram surface when the recorded information is reconstructed by applying a light beam having a small diameter to the hologram. The surface of the hologram is illuminated by scanning it with a light beam having a cross-section smaller than the hologram recording region, thereby reconstructing and reading the same recorded information separately from different hologram regions, and thus compensating for momentary disability to reconstruct the recorded information due to a scratch or stain. At the same time, since a light beam having a small beam diameter is used for reconstruction, the depth of focus of the reconstructed image increases, so that the number of restrictions on the installation position of the read sensor decreases.
    Type: Grant
    Filed: March 25, 1994
    Date of Patent: July 9, 1996
    Assignee: Dai Nippon Printing Co., Ltd.
    Inventor: Satoshi Yamazaki
  • Patent number: 5535024
    Abstract: A novelty filter utilizes self-nulling and self-aligning of reflection and transmission phase conjugate beams. A photorefractive crystal is arranged so that the contributions to the phase conjugate are equal and opposite in the steady state to produce destructive interference when the input image is stationary, and thus no output image is displayed. If the image moves, then the gratings will rewrite and erase themselves, each with their own response times, total destructive interference will not occur, and transient enhancement and surpression of the phase conjugate output signal will indicate the direction of motion of the input image.
    Type: Grant
    Filed: May 6, 1992
    Date of Patent: July 9, 1996
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Jihad Khoury, Charles L. Woods
  • Patent number: 5521724
    Abstract: An inexpensive electronic display that presents 3D images by binocular parallax is disclosed. The effect produced is that of a real-time holographic stereogram. The pixels of a 2D display are spatially multiplexed by two HOEs to produce a plurality of lateral viewing zones of 2D rasters, similar to the method used in lenticular screen systems. A directional screen HOE scatters incident light over a lateral viewing zone so small that typically only one eye of a viewer can occupy it at a time. A multiplexer HOE comprised of thousands of tiny holograms, each when reconstructed projects a spot onto the directional screen HOE. The sum of all these spots forms a two-dimensional raster of spots on the directional screen HOE. Each spot can be projected onto the directional screen HOE from at least two laterally different angles and thus reconstruct the directional screen HOE from at least two laterally offset angles, consequently creating at least two laterally offset viewing zones of each spot.
    Type: Grant
    Filed: April 11, 1994
    Date of Patent: May 28, 1996
    Inventor: Mark R. Shires
  • Patent number: 5519516
    Abstract: A hologram structure including a hologram layer including a half-tone pattern of transparent areas and reflection hologram areas, and a non-hologram half-tone pattern of areas that are substantially opaque to the range of wavelengths that comprises the spectral bandwidth of the holograms areas located adjacent the hologram layer, wherein the hologram areas are superimposed with selected areas of the non-hologram half-tone pattern.
    Type: Grant
    Filed: August 31, 1994
    Date of Patent: May 21, 1996
    Assignee: Hughes Aircraft Company
    Inventor: John E. Wreede
  • Patent number: 5502581
    Abstract: A hologram manufacturing apparatus and a hologram manufacturing method for manufacturing a hologram optical device by a split exposure method are disclosed. The manufacturing apparatus comprises light shield means having a spatial light modulator having a light transparent area and a light non-transparent area thereof controlled corresponding to an input signal, and drive means for driving the spatial light modulator by supplying the signal to the spatial light modulator. The light shield means is arranged closely to a photosensitive material.
    Type: Grant
    Filed: November 18, 1994
    Date of Patent: March 26, 1996
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toshiyuki Sudo, Naosato Taniguchi, Hideki Morishima
  • Patent number: 5497251
    Abstract: A hologram structure for use in a holographic center high mounted stoplight system for a vehicle. The hologram structure includes an illumination source for providing a reconstruction beam, a first array of non-overlapping hologram cells and non-hologram cells, and a second array of non-overlapping hologram and non-hologram cells. Each hologram cell of the first array produces a specular image that is viewable in a first predetermined angular field pursuant to diffraction of a portion of the reconstruction beam, and each hologram cell of the second array produces a diffuse image that is viewable in a second predetermined angular field pursuant to diffraction of a portion of the reconstruction beam. The specular images and diffuse images produced by the first and second holograms form stoplight illumination.
    Type: Grant
    Filed: November 22, 1993
    Date of Patent: March 5, 1996
    Assignee: Hughes Aircraft Company
    Inventors: John E. Wreede, Michael J. Virgadamo, Richard B. Upper, Ronald T. Smith
  • Patent number: 5491569
    Abstract: A high efficiency, broad bandwidth, volume holographic element for diffraction windows. This holographic element is fabricated so that it can passively track and diffract solar radiation throughout the course of a day. Such a hologram can effectively illuminate the interior of a building or room with sunlight. This invention can reduce both lighting costs and the cooling costs associated with generating artificial light.
    Type: Grant
    Filed: June 17, 1994
    Date of Patent: February 13, 1996
    Assignee: Northeast Photosciences
    Inventors: Juanita R. Riccobono, Jacques E. Ludman
  • Patent number: 5483363
    Abstract: A security device includes first and second diffractive structures contained within a surface relief structure. The structures are such that the device responds to illumination at a first, visible wavelength to generate a first, visible pattern while any pattern generated by the second structure is not substantially visible at that wavelength, and the device responds to illumination at a second wavelength substantially different from the first wavelength to generate a second pattern suitable for machine reading while any pattern generated by the first structure is substantially suppressed relative to the machine readable pattern at that wavelength.
    Type: Grant
    Filed: July 15, 1993
    Date of Patent: January 9, 1996
    Assignee: De La Rue Holographics Limited
    Inventors: Brian W. Holmes, Kenneth J. Drinkwater, David Ezra, Jon Andreassen
  • Patent number: 5477347
    Abstract: A holographic storage media for storing digital data in the form of an interference grating is provided which includes a substrate (48) over which a perforated opaque structure (50) is disposed. The opaque structure (50) has wells (52) disposed therein. In the wells, a photopolymer material (54) is disposed to form data storage regions (54). This is covered by a capping layer (56). The wells (52) are chemically and/or optically isolated from each other.
    Type: Grant
    Filed: July 14, 1993
    Date of Patent: December 19, 1995
    Assignee: Tamarack Storage Devices
    Inventors: Stephen R. Redfield, Gerald R. Willenbring
  • Patent number: 5455692
    Abstract: A hologram structure for use in a holographic center high mounted stoplight system for a vehicle. The hologram structure includes first and second hologram layers laminarly secured to each other, each having a plurality of bright hologram cells and dim hologram cells formed therein, and each hologram cell being configured to diffract light into a predetermined solid angular region. The bright hologram cells and the dim hologram cells of each hologram are arranged in a pattern to produce a recognizable pattern of bright and dim areas.
    Type: Grant
    Filed: November 15, 1993
    Date of Patent: October 3, 1995
    Assignee: Hughes Aircraft Company
    Inventor: John E. Wreede
  • Patent number: 5438439
    Abstract: Multiple volume holograms are recorded by changing the incidence angle of the reference beam at one wavelength. The stored holograms are reconstructed at another wavelength by using the reference beam oriented at the proper incidence angle. The proper holographic data are retrieved by pre-formatting or post-formatting the holographic data to be recorded or reconstructed. This usage of using different wavelengths for recording and reconstruction are independent of the scanning mechanisms for the reference beam. Utilization of holographic memories for storage and retrieval of data, and correlations can make use of this invention.
    Type: Grant
    Filed: August 13, 1993
    Date of Patent: August 1, 1995
    Inventors: Fai Mok, Demetri Psaltis, Hsin-Yu S. Li
  • Patent number: 5400155
    Abstract: A hologram surface to express a phase distribution, a visual field in which a solid image can be seen; and a stereoscopic display limit are set in a virtual space. A target to be stereoscopically displayed is subsequently expressed in the virtual space by a set of micro polygons. A plurality of slice planes which are parallel with the horizontal plane are set into the virtual space including the target. The line segments which intersect the polygons are obtained for every slice plane. The detected line segment is divided or clipped as necessary and is finally divided into the portion which can be always seen from the whole region of the visual field and a portion which is obstructed by another line segment and can be seen from only a part of the visual field, thereby extracting the line segment.
    Type: Grant
    Filed: October 12, 1993
    Date of Patent: March 21, 1995
    Assignee: Fujitsu Limited
    Inventors: Akihiko Ueda, Hirokuni Monzen, Hirokazu Aritake, Masayuki Kato, Masato Nakashima
  • Patent number: 5387989
    Abstract: A hologram structure for use in a holographic center high mounted stoplight system for a vehicle. The hologram structure includes a hologram layer having a plurality of holographic lenses formed therein, each holographic lens being configured to diffract light into a predetermined solid angular region.
    Type: Grant
    Filed: December 22, 1992
    Date of Patent: February 7, 1995
    Assignee: Hughes Aircraft Company
    Inventors: Ronald T. Smith, John E. Wreede, Mike Virgadamo, Richard Upper
  • Patent number: 5341230
    Abstract: A waveguide holographic telltale display for displaying images to a vehicle driver via the vehicle windshield. A light source injects light into the base of a clear inner windshield singlet. A mirror hologram between the inner and outer singlets confines a majority of the injected light to the inner singlet. An image hologram between the windshield singlets diffracts light out to the vehicle driver. A halfwave plate between the image hologram and the inner singlet reduces ghosting and allows the driver to view the images even through polarized sunglasses. IR light is blocked by a tinted outer singlet or a holographic solar coating. The display does not suffer from ambient turn from the sun, and the light source is hidden away from the vehicle dash.
    Type: Grant
    Filed: December 22, 1992
    Date of Patent: August 23, 1994
    Assignee: Hughes Aircraft Company
    Inventor: Ronald T. Smith
  • Patent number: 5293259
    Abstract: A holographic display and method for displaying hologram are disclosed. The method and apparatus provides a compact display arrangement in which the light source for illuminating the display is integral with the display, or in other words, an external light source is not necessary. The hologram utilized in the display is formed as a rainbow hologram, with a converging reference beam utilized in forming the diffraction grating upon the holographic plate. The display includes a pair of spaced transparent glass sheets, with the light source disposed between the glass sheets. The holographic plate formed with the converging reference beam is then mounted upon one of the glass sheets, with the light source illuminating the holographic plate with diverging illumination light. A mirror is associated with each of the transparent glass sheets at a location adjacent to the light source, with the reflective surfaces of the mirrors facing each other.
    Type: Grant
    Filed: December 7, 1992
    Date of Patent: March 8, 1994
    Assignee: The University of Alabama in Hunstville
    Inventors: Qiang Huang, John A. Gilbert
  • Patent number: 5291316
    Abstract: An information display system has a display screen which is substantially transparent to a selected band of wavelengths of light and can be mounted on a window. A projector projects an image of light of the wavelengths to which the display screen responds onto the screen to reflect or transmit the selected wavelengths of light from the screen. The screen is formed as a holographic optical element which reflects the light such that an observer is able to see the projected image from the display screen only if his eyes are within a predetermined area, while observers outside of the area see only a substantially transparent display screen on the window.
    Type: Grant
    Filed: September 27, 1991
    Date of Patent: March 1, 1994
    Assignee: Astronautics Corporation of America
    Inventors: David P. Haberman, Robert E. Rhoades, Arthur Cox, Richard D. Rallison
  • Patent number: 5289298
    Abstract: A hologram structure for use in a holographic center high mounted stoplight system for a vehicle. The hologram structure includes a hologram layer having a plurality of single grating holograms formed in therein, each single grating hologram configured to diffract light at a respective predetermined angle.
    Type: Grant
    Filed: December 22, 1992
    Date of Patent: February 22, 1994
    Assignee: Hughes Aircraft Company
    Inventor: Ronald T. Smith
  • Patent number: 5267060
    Abstract: A color matrix display including a color matrix reflective filter (10) having groups of reflective red, green and blue (R, G, B) color elements (12) arranged in subgroups (20). The elements (12) of each color group (R, B, G) in each subgroup (20) are aligned with pixel subgroups of a matrix control element or LCD (18). The color elements (12) of the reflective filter transmit light (26) of their associated color to an aligned pixel associated with that color and reflect back (30) light of other colors to a reflective light assembly (16) for reuse. The color matrix reflective filter (10) is made by selectively exposing selected areas of a holographic optical element, or HOE, with a light of colors other than the color desired to be transmitted by that element (12) of that selected area.
    Type: Grant
    Filed: May 19, 1992
    Date of Patent: November 30, 1993
    Assignee: Rockwell International Corporation
    Inventor: Russell F. Colton
  • Patent number: 5255108
    Abstract: By modifying the exposure sequence of the facets in a hologon during manufacture, it is intended to maximize the spatial frequency of the error especially in hologons having large numbers of facets so that the error frequency is multiplied by a large factor, thereby greatly reducing the eye's ability to detect banding problems. This method also minimizes the adjacent facet error as far as is practical.
    Type: Grant
    Filed: April 27, 1992
    Date of Patent: October 19, 1993
    Assignee: Eastman Kodak Company
    Inventors: Badhri Narayan, James E. Roddy
  • Patent number: 5253088
    Abstract: By modifying the exposure sequence of the facets during manufacture of a hologon image writer the visibility of cross scan errors are minimized, thereby reducing exposure error and visible banding. With hologons having a number of facets "n" the general form of the exposure sequence is 1, n, 2, n-1, 3, n-2 . . . .
    Type: Grant
    Filed: April 27, 1992
    Date of Patent: October 12, 1993
    Assignee: Eastman Kodak Company
    Inventors: Badhri Narayan, James E. Roddy
  • Patent number: 5245448
    Abstract: A moving holographic image is projected into three space by producing a series of slides or fixed holographic images in quick succession in a process similar to a conventional motion picture All of the slides are produced on a single photochromic surface in succession by writing on the surface with UV light. Each slide consists of a set of identical strip holograms positioned on the photochromic surface as an array. Each strip hologram is produced by creating a series of traces arranged side by side. As the maxima traverse the surface, the UV source is turned on and off according to a program to produce a series of dots of either unchanged or darkened color on the photochromic surface. During the next scan a new set of unchanged or darkened dots are produced on each strip hologram, and so on until the slide is completed. After being illuminated the surface is quickly washed clean in preparation for the next slide by illuminating it with a burst of high intensity UV light.
    Type: Grant
    Filed: March 13, 1992
    Date of Patent: September 14, 1993
    Inventor: Gregory D. Waits
  • Patent number: 5196951
    Abstract: A reflection hologram structure including a transparent substrate, and a pattern of shielded hologram containing regions and transparent regions disposed on the transparent substrate, the pattern being unresolvable to the viewer. The shielded hologram containing areas comprise hologram subregions and shielding subregions overlying the hologram subregions. The shielding subregions comprise for example, opaque regions or partially illumination transmissive regions.
    Type: Grant
    Filed: June 26, 1991
    Date of Patent: March 23, 1993
    Assignee: Hughes Aircraft Company
    Inventor: John E. Wreede
  • Patent number: 5186533
    Abstract: A lamp arrangement for a motor vehicle comprises a light source including a plurality of bulbs and arranged in a rear shelf panel, and a transmission hologram mounted on a rear window on the cabin side thereof. The transmission hologram includes a plurality of divisions which have different diffraction characteristics from each other. Almost all incident lights from the light source are diffracted by any of the divisions rearward of the vehicle.
    Type: Grant
    Filed: April 10, 1992
    Date of Patent: February 16, 1993
    Assignee: Nissan Motor Co., Ltd.
    Inventor: Masayuki Hori
  • Patent number: 5138471
    Abstract: A method is disclosed for making holographic images by recording an array of pixels which together form a two or three dimensional composite image. Each pixel corresponds to a sampling of just those rays which would pass through a given point on the surface of an ordinary hologram. Every common type of hologram can be made by this method, including 2D/3D holograms, stereograms, and full color holograms. Each pixel is a white light viewable hologram generated by recording a small hologram near the narrowest part of a converging bundle of rays of coherent light, usually with each ray corresponding to one point on the object, and the rays in a pixel being confined to a horizontal plane intersecting the surface of the object.
    Type: Grant
    Filed: July 20, 1990
    Date of Patent: August 11, 1992
    Inventor: Stephen P. McGrew
  • Patent number: 5111445
    Abstract: An optical system for reading a plurality of radially contiguous individual holograms previously recorded on a rotatable disk along at least one of the disk tracks, each hologram being representative of a predetermined data pattern, and each being recorded as a Fourier transform hologram with respect tot the direction (y direction) tangential to the tracks and as a Fresnel hologram with respect to the radial direction (x direction), and wherein the optical system illuminates the disk with a read-out beam which is at least partially reflected by the disk to an array of photosensitive detectors which generates electrical data signals. A latch circuit is included for recovering the value of each data signal when the read-out beam completely illuminates one of the holograms.
    Type: Grant
    Filed: November 17, 1989
    Date of Patent: May 5, 1992
    Assignee: Sony Corporation
    Inventors: Demetri Psaltis, Alan Yamamura, Seiji Kobayashi
  • Patent number: 5056880
    Abstract: An inexpensive wallpaper, which may be plastic and self adhesive. Using the positive features and advantages of thin-layer holograms and other existing technology, the claimed invention produces a changing, moving or stable 3-D effect in the presence of a low-powered laser illuminating system. In usual (incoherent) light, the claimed wallpaper reflects light as does a standard wallpaper. On the claimed wallpaper, images of any kind can be additionally printed without damaging the coherent 3-D reconstruction. The claimed wallpaper produces 3-D images, whose qualities are not affected by mechanical damage of any kind, including scratching or scraping, and it can also be produced in a washable embodiment. The suggested object incorporates recognized computer techniques, by which an image of any level of complexity can be included. The wallpaper can be printed on plastic or other media by sequentially applying a pre-prepared small-area matrix.
    Type: Grant
    Filed: April 8, 1990
    Date of Patent: October 15, 1991
    Assignee: DZ Company
    Inventor: Joseph Barbanell