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7436561 Hologram laser unit and optical pickup apparatus  
A laser light beam of a first wavelength which is polarized in a first polarizing direction, emitted from first and second semiconductor laser elements and reflected by an information recording...
7418170 Optical device and virtual image display device  
A virtual image display device is provided which displays a two-dimensional image for viewing a virtual image in a magnified form by a virtual optical system. The virtual image display device...
7388696 Diffuser, wavefront source, wavefront sensor and projection exposure apparatus  
A wavefront source having a wavefront formation structure ( 4 a ) and a diffuser with a scattering structure ( 2 b ) in the beam path in front of or at the level of the wavefront formation...
7355768 Wavelength tunable holographic filter with broad acceptance angle and narrow spectral bandwidth  
A narrowband, tunable filter with a wide acceptance angle utilizes two holographic filter elements connected in series. The filter blocks light outside of a narrow spectral band of interest, while...
7298553 Element for the combined symmetrization and homogenization of a bundle of beams  
The invention relates to an element for the combined symmetrization and homogenization of a beam of rays and to a method for designing an element of this type. One object of this invention is to...
7298535 Digital situation indicator  
A personal monitoring system to be worn by an individual in a hazardous situation comprises an enclosed face mask which includes a transparent shield over at least the eves a sensor module secured...
7227688 Apparatus for applying optical gradient forces  
An apparatus and method for manipulating small dielectric particles. The apparatus and method involves use of a diffractive optical element which receives a laser beam and forms a plurality of...
7218429 Digital focus lens system  
A digital focus lens systems that can provide an optical system with a plurality of selectable focal powers is described. The system includes a number of switchable elements, each of which is...
7212323 Methods and apparatus for mass manufacturing two-dimensional binary information on transparent substrates using phase contrast modulated templates  
Methods and apparatus for making, encoding, and encrypting binary patterns for storing recorded information. One of the methods includes the steps of providing an original image, fragmenting the...
7209269 Displaying holographic three dimensional images  
Holographic three dimensional images of objects can be displayed via a device comprising micro holographic optical elements (MHOEs). A device for displaying holographic three dimensional images of...
7180669 Method and system for generating substantially uniform speckle patterns  
A diffractive optical element is positioned in an optical path between a coherent light source and a surface. The diffractive optical element is designed to disperse the light across one or more...
7180668 Optical pickup device and optical disc device  
This invention is an optical pickup device having a composite optical element ( 32 ) which has a first diffraction grating ( 45 ) for splitting a light beam emitted from a light source ( 31 ) into...
7161131 Multiple wavelength quadrant detection  
A quadrant detector includes a holographic optical element and a plurality of detector elements. The holographic optical element is designated to have four quadrants, each of which directs...
7133172 Variable hologram element, and optical device using the same  
The invention relates to an optical element with variable optical properties, which ensures that the amount of light available is increased, and an optical device using the same. In a liquid...
7126730 Electro-holographic lens  
An electro-holographic lens device comprising: an active layer made from a transparent photo-refractive material, whose refractive index may be locally modified by locally applying an electric...
7099590 Filtering technique for free space interconnects  
A filtering technique for a free space communication that features encoding and decoding of signals employing a filtering apparatus that includes a bulk holographic transform function. Employing...
7050207 Optical pickup device using hologram pattern and hologram pattern generating method  
Astigmatism and coma are suppressed in an optical pickup device such that light from a single real laser light source is diffracted and divided by a hologram module into a plurality of light spots...
6992804 Part made of transparent material and headlight lens for vehicles  
A part ( 1 ) made of transparent material that allows visible light waves to pass therethrough, said part comprising outer faces ( 11, 12 ) defining a solid body ( 10 ) made of transparent...
RE38943 Compound objective lens for optical disks having different thicknesses  
A compound objective lens is composed of a hologram lens or transmitting a part of incident light without any diffraction to form a beam of transmitted light and diffracting a remaining part of the...
6987614 Optical pickup and optical disc drive device  
This invention is an optical pickup device having a composite optical element ( 32 ) which has a first diffraction grating ( 45 ) for splitting a light beam emitted from a light source ( 31 ) into...
6972904 Pointable optical transceivers for free space optical communication  
Optical transceivers include a diffractive optical element (DOE) attached to a surface of a prism or other optical support. The DOE is configured to direct an input optical signal to a planar or...
6967754 Hybrid optical transceivers for free space optical communication  
Optical transceivers include a diffractive optical element (DOE) attached to a surface of a prism or other optical support. The DOE is configured to direct an input optical signal to a curved...
6952295 Hologram screen and hologram display  
A hologram screen 1 displays an image by diffracting and scattering image light 31 projected from an image projection apparatus 2 . An upward/downward light scattering device 13 , which...
6922267 Image display apparatus  
An image display apparatus has an image display device for displaying an image, an eyepiece optical system, including a holographic magnifying optical element, for magnifying and projecting the...
6867889 Transceiver for a wireless optical telecommunication system  
A holographic optical element (HOE) device is mounted in wireless optical telecommunication system transceiver. The HOE device includes a developed emulsion material having an interference pattern...
6856460 Diffractive optical element for providing favorable multi-mode fiber launch and reflection management  
A light transmission system includes a laser, an optical fiber, and a transfer lens. The transfer lens transfers light emitted by the laser into the optical fiber. The transfer lens includes a...
6853812 Polarized-holographic filtering providing improved extinction ratio  
A filtering technique for free space communication that features an improved extinction ratio by providing a filter that employs a bulk holographic transform function and a polarizing film. In this...
6847761 Optical module and method of forming the optical module  
An object beam divided by a light dividing means 12 is caused to enter a photo-refractive polymer layer 6 through an optical fiber 23 . On the other hand, a reference beam divided by the light...
6842271 Rain sensor, in particular for a motor vehicle  
A rain sensor for a motor vehicle, having a transmitter emitting radiation, a receiver, and a holographically embodied diffractive element that has a linear-grating-like structure.
6833938 Variable hologram element, and optical device using the same  
The invention relates to an optical element with variable optical properties, which ensures that the amount of light available is increased, and an optical device using the same. In a liquid...
6822794 Diffractive optical element for providing favorable multi-mode fiber launch and reflection management  
A light transmission system includes a laser, an optical fiber, and a transfer lens. The transfer lens transfers light emitted by the laser into the optical fiber. The transfer lens includes a...
6805490 Method and system for beam expansion in a display device  
A planar substrate having a first diffractive element for coupling light waves of different colors into the substrate and guiding the light waves by successive internal reflections. A second...
6738130 Ultra-light helmet-mounted laser range finder  
A holographic telescope ( 40 ). The novel invention is comprised of an eyepiece ( 44 ) and a first holographic optical element ( 42 ) positioned to receive incident electromagnetic energy and focus...
6731415 Multi-aperture holographic optical element for use in a free space optical communication system  
A holographic element (HOE) with multiple apertures formed in a single substrate for use an optical communication system. The multi-aperture HOE can be use instead of an optics unit having one or...
6724508 Internal reflection apparatus and method using a holographic optical element for a free space optical communication system  
An apparatus for a free space optical communication system includes an element having a front surface and a back surface. A holographic optical element (HOE) is disposed to receive a light signal...
6667819 Reflection type diffuse hologram, hologram for reflection hologram color filters, etc., and reflection type display device using such holograms  
A reflection type color display device and a reflection type of direct-view color display device are provided. The reflection type color display device includes a spatial light modulator having a...
6661546 Multi-aperture holographic optical element for illumination sensing in a free space optical communication system  
A free space (FSO) receiver includes an illumination sensing unit with multiple illumination apertures. The illumination sensing unit is used in deriving alignment information from portion(s) of a...
6654399 Semiconductor light projection apparatus and distance measurement apparatus  
In performing an light emitting operation using a plurality of semiconductor light-emitting devices, these semiconductor light-emitting devices are lighted up such that the driving current is...
6643039 Holographic reflector and reflectiver liquid crystal display using it  
When illumination light is externally incident on a liquid crystal display, of the incident light, light of a polarized component in one direction passes through a polarizing film to reach a liquid...
6624940 Method for applying optical gradient forces and moving material  
An apparatus and method for manipulating small dielectric particles. The apparatus and method involves use of a diffractive optical element which receives a laser beam and forms a plurality of...
6608708 System and method for using a holographic optical element in a wireless telecommunication system receiver  
A holographic optical element (HOE) device is mounted in a receiver unit, such as a wireless optical telecommunication system receiver. The HOE device includes a developed emulsion material having...
6593958 System, apparatus and method for the recording and projection of images in substantially 3-dimensional format  
A system for the production of a second three-dimensional image magnified from a first three-dimensional image in substantially the same proportions, including a first active optical system for...
6580529 Holographic optical devices  
The invention provides a holographic optical device, including a light-transmissive substrate; a first holographic optical element carried by the substrate; at least one second holographic optical...
6577411 Optical system for alternative or simultaneous direction of light originating from two scenes to the eye of a viewer  
An optical system for alternative or simultaneous direction of light from two scenes to the eye of a viewer comprising (a) a first lens ( 42 ) having a first focal length; (b) a second lens ( 44 )...
6509702 Method for correction of temperature induced focus errors in a head-up display unit by measuring coefficients of thermal expansion  
A method of compensating for and correcting temperature induced focus and distortional errors within a head-up display unit is described. The head-up display is comprised of a cathode ray tube and...
6483613 Reflective display device and a light source for a display device  
A reflective liquid crystal display device (LCD) ( 40 ) includes: a substrate ( 60 ), a reflecting layer ( 61 ), a liquid crystal layer ( 62 ), an electrode layer ( 63 ), a color filter layer ( 64...
6462869 Projection screen and system for large-surface images  
A projection screen ( 30 ) for representation of images by back-projection comprises a plurality of holographic-optical elements ( 10 ) arranged in one plane. The holographic-optical elements are...
6452700 Computer backplane employing free space optical interconnect  
Provided is an optical backplane interconnect system, one embodiment of which features transceiver subsystems employing holographic optical elements (HOEs) that define, and discriminate between,...
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...
6426811 Switchable holographic optical system  
An optical system and an imaging and display system using the optical system. The optical system has at least first and second optical elements aligned on a common axis. In one embodiment, each of...
Matches 1 - 50 out of 247 1 2 3 4 5 >