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6909544 |
Method for eliminating strong ambient light in aircraft cockpits
Light is polarized in perpendicular directions between a source of light and a users viewing of information on a display device. A first sheet of polarized material is placed at the source of the...
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6900936 |
Illumination system for reflective displays
An illumination system for a reflective display is particularly useful for microdisplays that use reflective displays. The light source and the reflective image display unit are mounted in a...
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6897434 |
All-fiber photon-pair source for quantum communications
A source and/or method of generating quantum-correlated and/or entangled photon pairs using parametric fluorescence in a fiber Sagnac loop. The photon pairs are generated in the 1550 nm fiber-optic...
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6857745 |
Method of manufacturing illumination optical unit, apparatus for manufacturing illumination optical unit, illumination optical unit manufactured by the manufacturing method, and projector
A first positioning step positions and fixes a light focusing element and a polarization converting element. A beam introducing step introduces beams to a beam splitting element, the light focusing...
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6735017 |
Broadband optical retardation device
A broadband optical retardation device, such as may be used for polarisation encoding of display information or in diffractive optical systems, includes a patterned uniform half wave plate retarder...
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6717730 |
Tunable optical filter
An optical filter including first and second polarizers, a Faraday rotator and a birefringent element operating together to filter light with a changeable optical transmittance versus wavelength...
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6650306 |
Security-enhanced display device
A device for displaying images only to an authorized user includes a display device configured to display the images. The display device includes a backlight for generating incident light of mixed...
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6646801 |
Glare reduction system and method
A system and method for reducing glare is provided in accordance with the present invention. The system may include a first polarizer transmitter for filtering light from a source, and a second...
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6637886 |
Projection display device
The invention accurately sets a polarization direction of a polarization element, and prevents deterioration of the usage efficiency of the light and a reduction in image contrast. Field lenses are...
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6631992 |
Projector color correction to target white points
A system for adjusting the color of a light source comprises a first polarizer to polarize the light source, a fixed retarder with its optical axis at a first angle to the polarized light, an...
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6600601 |
Polarization-independent optical isolator and production method thereof
A polarization-independent optical isolator includes a first birefringent wedge plate having an inclined plane directed to a light incoming side; a second birefringent wedge plate having an...
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6597328 |
Method for providing privately viewable data in a publically viewable display
A method for providing privately viewable data in a publically viewable display includes the steps of: positioning obscuring lights proximate to the publicly viewable display; generating a...
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6580558 |
Optical isolator
An optical isolator includes a first pigtail assembly, a first collimating lens aligned with the first pigtail assembly, an optical rotator assembly, an adjustable assembly aligned with the rotator...
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6567216 |
Polarization element of an irradiation device for polarized light for optical alignment of a liquid crystal alignment layer
A polarization element in which glass plates are inclined at the Brewster angle with respect to the optical axis of the incident light beam and are combined with one another in a V-shape, has a...
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6553156 |
Optical isolators with ultra-low polarization mode dispersion
This invention presents a novel tunable module that can be incorporated in various optical devices, to provide a tunability and selectivity in a characteristic of an optical signal by effectively...
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6552850 |
Device, method, and system of display for controlled viewing
The present invention provides a device, method, and system for secure viewing and use of banking and other electronic access devices. The present invention comprises a computer/video display...
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6481851 |
Adjustable contrast reflected display system
A transparent-reflective display constructed to be alterable so that reflected images are viewed upon a transparent surface that can alter to a darkened surface, thereby changing contrast of the...
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6476966 |
Continuously variable, wavelength-independent polarization rotator
A useful optical device to provide continuously variable rotation of polarization of linearly polarized light in a wavelength-independent manner. This device features a cell of twisted nematic...
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6449091 |
Optical isolator
Tuning to maximize the isolation provided by an optical isolator to one of a predetermined plurality of wavelengths is achieved by tilting the isolator with respect to an input beam of light....
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6414790 |
Polarized non-rotating variable light transmitting window
A window whose light transmission can be mechanically controlled and varied smoothly from a high value of approximately 40% to a low value of approximately 1% is achieved without the requirement of...
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6348998 |
Polarization phase plate assembly
Polarization phase plate Assembly comprises at least two uniaxial crystal plates which are identical to each other in structure and dimension and a retarder plate sandwiched between the two...
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6342968 |
Frequency tuning of optical devices
Methods and apparatuses for tuning optical devices are described. Optical devices can be tuned by inserting tuning plates into the optical path(s) of the devices. Tuning plates can be, for example,...
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6328449 |
Brewster-angle dispersion filter (U)
A particular wavelength may be eliminated from the spectrum of a randomly polarized thermally radiative scene by a quarter-wave polarizer and a dielectric dispersive mirror angularly positioned at...
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6301044 |
Apparel color and image effect system
A system for producing a visual effect at a surface of apparel worn by a performer including: a latent image projector which projects light comprising polarizer-encoded latent visual information,...
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6275337 |
Method for viewing through reflections from a reflective surface without affecting point of impact
Featured is a method and device that minimize the effects of reflections from a transparent surface while viewing an object or target area through such reflective surface and which accomplishes...
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6262843 |
Polarizing privacy system for use with a visual display terminal
The privacy system apparatus and method of the present invention allow users of a publicly accessible terminal to privately access information displayed on a visual monitor of the terminal. In one...
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6256122 |
Device for the elimination of the zero order beam emerging from a hologram illuminated in polarized light
Device for elimination of the zero order beam emerging from holograms illuminated in polarized light includes a birefringent plate (5) illuminated by both said zero order beam (3) and by a...
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6249379 |
Optical beam power controller using a tiltable birefringent plate
The present invention is an inexpensive optical beam power controller for providing fast, continuous control of a linearly polarized optical beam, such as a beam from a laser. In essence, the...
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6239907 |
Rear projection screen using birefringent optical film for asymmetric light scattering
A dispersing element for a rear projection screen assembly is sensitive to the polarization of the light passing through the element. In particular, the element disperses light having a first...
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6192063 |
Polarization-dependent type directional isolator and ring-type resonator laser
A polarization-dependent type directional isolator. The polarization-dependent type directional isolator comprises a pair of first optical means positioned at a path along which light travels for...
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6175449 |
Transmission polarizer
The invention relates to a device for changing the polarization of an incident electromagnetic wave. Existing devices to change the polarization of an incident electromagnetic wave preserve signal...
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6154316 |
Polarizer labelling tape and method for making the same
A polarizer labelling tape comprises a series of releasable strips which are connected end-to-end to each other by adhesive strips arranged at respective connections between the releasable strips,...
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6115177 |
Interactive 3-D viewing glasses
An image viewing system to permit viewing of three-dimensional images, wherein users wear a pair of eyeglasses to view displayed images. The pair of eyeglasses include lenses having LCD polarizing...
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6074065 |
Polariser made from brewster plates
A polarizer envisaged for the polarization by reflection, in particular for the polarization of ultraviolet light with large apertures comprises light-permeable, preferably plane-parallel plates...
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6055104 |
Optical attenuator
A polarization beam splitter combiner uses a birefringent crystal that is a fraction of the size of conventional crystals used in similar devices. Since the crystal is considerably shorter in...
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6053795 |
Toy having image mode and changed image mode
A toy or novelty article including an image located thereon, having a reflective "mirror" mode and a transmissive mode, such that a generally opaque material is viewable in the transmissive mode....
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6046849 |
Parallax barrier, display, passive polarisation modulating optical element and method of making such an element
A parallax barrier includes a polarisation modifying layer having aperture regions, for supplying light of a second polarisation when receiving light of a first polarisation, separated by barrier...
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6028303 |
Polarizing filter control mechanism to reduce reflected light
A polarizing filter control mechanism used in a camera that automatically rotates a polarizing filter in order to minimize the effects of reflected light on a photographic image. An image signal is...
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5999316 |
Light valve with rotating polarizing element
The present invention provides light valves including polarizing elements in which light transmission can be controlled by rotating at least one of the polarizing elements about an in-plane axis....
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5999317 |
Toy mirror with transmissive image mode
Toy or novelty including a first polarizer and a second polarizer movable relative to the first polarizer. In a first mode, the first and second polarizers interact to be reflective, and in a...
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5986805 |
Polarizer/modulator assembly for lasers
A polarizer/modulator assembly (10) including a polarizing unit (12) and a modulator unit (14) that are selectively and independently positionable within a resonator cavity of a solid state diode...
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5969861 |
Polarizing optical system
A polarizing optical system comprising: at least, polarizing characteristic imparting means for imparting a polarizing characteristic to light emitted from a light source; analyzer means for...
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5926295 |
Holographic process and device using incoherent light
An optical device for generating a signal based on a distance of an object from the optical device. The optical device includes a first polarizer, a birefringent crystal positioned optically...
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5900975 |
Ghost image extinction in an active range sensor
An apparatus is provided that includes a plate beamsplitter having a first surface coated with a partially reflective coating, and a second surface coated with an anti-reflective coating, and a...
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5900974 |
Backing plate for contrast enhancement of photolithographic images on transparent substrates and method of using same
A backing plate for a transparent substrate constructed of two polarizer sheets. The axes of polarization of the polarizer sheets are substantially orthogonal to each other. The backing plate thus...
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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...
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5867315 |
Crystal optic lens and an optical system for an optical pickup device
A bifocal crystal optic lens made of a uniaxial crystal comprising two surfaces having a same axis, at least one of the two surfaces being a spherical surface or an aspherical surface. An optical...
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5841581 |
Method and apparatus for making a spatially selective high resolution light filter
A method and apparatus that bonds two orthogonally polarized plastic films into a single sheet, self aligned, orthogonally polarized filter. A laser heats regions of the films to depolarize...
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5822117 |
Systems for three-dimensional viewing including first and second light polarizing layers
Systems for three-dimensional viewing aimed at full-color flat-screen binocular stereoscopic viewing without the use of eyeglasses for the viewer. According to the invention, light emanating from a...
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5790299 |
Optical isolator employing a cadmium-zinc-tellurium composition
A Faraday rotator for rotating a plane of polarization of polarized light, said Faraday rotator having an optical element comprising a rod which is comprised of an optically transmitting...
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