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6621605 |
Computer-assisted method and device for restoring three-dimensional images
A three-dimensional image is stored (E0) in a computer memory in the form of digital data and defined in a three-dimensional geometrical space. Two-dimensional images are calculated (E1) by...
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6614565 |
System and method for producing and displaying a one-step, edge-lit hologram
A system and method are disclosed for producing and displaying a one-step, edge-lit hologram. For production, an object beam and an edge-lit reference beam are directed at holographic recording...
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6611365 |
Thermoplastic substrates for holographic data storage media
In one embodiment, holographic data storage medium includes a first thermoplastic substrate portion having a thickness less than approximately 2 millimeters and a second thermoplastic substrate...
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6600580 |
Hologram print system and holographic stereogram
A single photographic subsystem 2 photographs an original image for a hologram and provides an image information file Fp. In addition, this subsystem provides a management information file Fm for...
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6597478 |
Phase-conjugate holographic data storage device using a multifocal lens and data storage method thereof
A phase-conjugate holographic data storage device capable of enhancing the characteristics of recording and reproducing data by using a focusing lens is provided. The holographic data storage...
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6567193 |
Hologram production technique
A system for forming holographic pixels on the surface of a workpiece is disclosed. The system comprises a laser generating a laser beam; a beam splitter dividing the laser beam into a first beam...
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6538776 |
Self-referenced holographic storage
The invention presents the concept of self-referenced holographic data recording. In exemplary embodiments, the invention comprises methods of recording holograms on holographic data storage media;...
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6538775 |
Holographically-formed polymer dispersed liquid crystals with multiple gratings
A multicolored reflection liquid crystal display device includes a pair of substrates having a reflective holographic polymer dispersed liquid crystal (H-PDLC) film disposed therebetween. The...
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6529297 |
Color hologram recording medium and process for fabricating the same
A color hologram recording medium 2 includes volume hologram recording mediums 14 R, 14 G and 14 B for diffracting light of wavelengths different from each other. Reconstruction patterns 1 R,...
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6525847 |
Three dimensional projection systems based on switchable holographic optics
Switchable holographic optical elements (HOEs) can used in systems and methods for projecting three-dimensional images, or for projecting two-dimensional tiled images with increased size and/or...
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6525846 |
Wavelength division multiplex/demultiplexing device
A wavelength division multiplexing device and method includes two prisms having a pair of coated, highly reflective opposed faces forming an etalon. A volume phase grating is sandwiched between the...
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6512609 |
System and method for correcting projection distortions in a hologram producing system
A system and method are disclosed to replace complex fast cylindrical lens (FCL) systems used for producing one-step horizontal parallax only holographic sterograms. A substantially monochromatic...
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6504629 |
Method and apparatus for illuminating a display
Disclosed is a device for producing colored light and an image generating apparatus including such a device. The device includes a switchable light-directing apparatus configured to receive light...
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6501571 |
Three-dimensional holographic stamping of multi-layer bit-oriented non-linear optical media
A master hologram is generated in a first optical medium by use of a plurality m of different reference beams, each beam bearing information suitably recorded in one or more of a plurality n layers...
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6492065 |
Hologram color filter, production method of the same hologram color filter and space light modulating apparatus using the same hologram color filter
A thickness of each hologram lens for forming a hologram color filter is set so as to be smaller as the wavelength of light to be diffracted by each hologram lens is shorter. A thin plate glass...
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6490061 |
Optical information recording and reproducing apparatus having volume holographic memory
A description is provided of an optical information recording and reproducing apparatus. The apparatus comprises: a holographic memory made of a photorefractive crystalline material; a support...
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6473209 |
Apparatus for producing a three-dimensional image
Described herein is an apparatus for producing three-dimensional staic or moving images. In one embodiment, the apparatus includes an image generator and an optical device. The image generator...
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6473208 |
Two-color holographic recording apparatus
A two-color holographic recording apparatus reduces error signals possibly included in reproduced digital data signals. The two-color holographic recording apparatus has first, second and third...
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6456405 |
Method and apparatus for displaying computer generated holograms
A method for displaying computer generated holograms of a display object is performed by computing fringe patterns produced by light interference from the display object. The steps are summarized...
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6452699 |
Controlled diffraction efficiency far field viewing devices
This invention pertains to the design of optimized far field viewing devices that simultaneously produce bright far field holographic light patterns and achieve good see-through performance to...
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6449067 |
Cartridge for hologram-image recording medium and cartridge including braking mechanism
A cartridge for holding a hologram-image recording medium for use with a hologram-image recording apparatus, including locating means for properly positioning said cartridge, for sequentially...
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6445470 |
Apparatus for simultaneous spatial modulation of incoherent/coherent angulary multiplexed optical beams
Novel apparatus for simultaneous spatial modulation of a set of angularly multiplexed individually coherent but mutually incoherent optical beams is disclosed, comprising means for generating a set...
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6441930 |
Method and apparatus for making holograms including a diffuser shiftable in its own plane
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...
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6436584 |
Image-recording medium, method for forming image-recording medium, method and apparatus for reading data
There is described an image-recording medium and an image-reading method, which make it possible to improve reading accuracy of information by avoiding duplication of an optical variable image with...
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6426812 |
Hologram color filter, and its fabrication method
The present invention provides a hologram color filter having a drastically decreased dependence of diffraction efficiency on wavelength and well corrected for a color balance among the three...
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6424437 |
Projection display employing switchable holographic optical elements
The present invention relates to an optical system for use in a projection display system. The optical system, in one embodiment, includes a first electrically switchable holographic optical...
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6414763 |
Digital holographic camera system and method having removable media
A digital electronic camera includes a holographic medium, an imaging array disposed at a focal plane for converting optical information to digital information; and an optical system configured to...
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6414761 |
Secure holographic images on paper
A paper support has an adhesive layer and a metallized holographic image, wherein the metallized holographic image includes at least two holograms, such that the first hologram is visible only by...
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6414296 |
Multiple pixel reading of holographic data including a position error calculation
The invention includes a method of generating a position error signal in a holographically imaged data recording system. This method comprises using an optical imaging system to image a plurality...
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6407833 |
System and method for producing and displaying a one-step, edge-lit hologram
A system and method are disclosed for producing and displaying a one-step, edge-lit hologram. For production, an object beam and an edge-lit reference beam are directed at holographic recording...
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6404519 |
Method of advertising on a motor vehicle
A method of advertising on a motor vehicle having a substantially transparent window including steps of providing a holographic film with a holographic image, and adhering the holographic film to...
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6404518 |
Full-color hologram and method of producing the same
A full-color hologram capable of generating a bright image and reproducing colors in all color regions is formed by multiple recording or multilayer recording with four different dominant...
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6400474 |
Image recording apparatus and holographic recording medium cartridge
A slit head 76 A is provided prior to intermittent feed rollers 73 A and 73 B. The slit head 76 A is made of a rigid body such as magnetic iron and is used as a contact member. The slit head ...
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6396463 |
Image projection apparatus
There is provided an image projection apparatus which is small and in which a picture image can be stably observed while high resolution is maintained. The image projection apparatus is structured...
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6388780 |
Hologram production technique
Apparatus for producing dot matrix holograms through laser ablation utilizing only two two-axis, low-inertia beam deflectors to control the maximum holographic direction, and the holographic...
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6388779 |
Process for holography involving tilt compensation
The invention involves a holographic system containing a photopolymer-type storage medium located in the system's optical path, where the medium is rotated around a first axis such that the surface...
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6377370 |
Optical display apparatus
An optical display apparatus is provided that can utilize a low intensity point light source and that requires a small physical profile. The optical display apparatus comprises an image display...
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6377369 |
Holgraphic display with switchable aspect ratio
A holographic display system comprising left and right optical systems is disclosed, The optical systems each comprise an image display operable to display an input image and first and second...
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6366368 |
Method and apparatus for forming hologram
The invention makes it possible to form a hologram for reproducing a three-dimensional image easily free of limitations placed by the size of the three-dimensional image to be reproduced, the size...
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6356366 |
Holographic light focusing device
A holographic light focusing device is disclosed. The device generally comprises an elongate member having an input end and an output end, a light source disposed at the input end, and a light...
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6353489 |
Optical retro-reflection device
An optical retro-reflective apparatus for application to reconfigurable displays for highway signs and other applications is disclosed. In a first preferred embodiment, the apparatus includes a...
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6348983 |
Holographic storage medium having enhanced temperature operating range and method of manufacturing the same
A holographic storage medium, a method of manufacturing the holographic storage medium and a holographic storage device incorporating the storage medium. In one embodiment, the holographic storage...
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6339486 |
Holographic technique for illumination of image displays using ambient illumination
An apparatus and method is disclosed for illuminating an image display with ambient light using holographic techniques. The apparatus includes a pair of holographic optical elements each having a...
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6330088 |
Method and apparatus for recording one-step, full-color, full-parallax, holographic stereograms
The present invention concerns methods and devices for creating and printing variable size and variable resolution holographic stereograms and holographic optical elements using computer rendered...
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6330087 |
Hologram device and method for producing the same
A hologram of an increased size using a single color laser, capable of executing a full color regeneration in a desired view angle and a method for producing the hologram. A plurality of...
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6320683 |
Optical information recording and reproducing apparatus using a volume holographic memory
A description is provided of an optical information recording and reproducing apparatus which detachably supports a volume holographic memory formed of a photorefractive crystal. The apparatus...
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6317228 |
Holographic illumination system
Disclosed is an apparatus and method of illuminating an image display via an electrically switchable holographic optical element. The method includes a first electrically switchable holographic...
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6301028 |
Holographic memory and optical information recording and reproducing apparatus using the same
A description is provided of an optical information recording and reproducing apparatus employing a holographic memory. The apparatus includes a mask disposed in an optical path of the signal light...
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6293898 |
Holographic memory
Holographic memory including a plurality of HOEs stacked in a vertical direction for two dimensional addressing of a recording medium for increasing a recording capacity and improving productivity...
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6292279 |
Optical system for recording or replicating hologram
The invention provides a hologram recording or replicating optical system wherein a misalignment-with-time of the center of a laser generated beam is automatically corrected so that the color...
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