Product
Patsnap Eureka
For R&D, Patsnap Eureka makes reading and utilizing patents & technical documents easy.
Patsnap Eureka AIR
Designed for self-driven R&D workflows. Generate viable solutions, solve complex R&D challenges, empower your innovation with AI.
Patsnap Eureka Materials
Designed for material experts only. Revolutionize your material R&D, from search, analyze, to developing new materials.
Feature
TechResearch
Generate reliable direction feasibility study reports for your R&D in just a few steps.
TechSeek
Discover and master advanced knowledge NOW. Basics, ideas, possibilities, all at once.
TechMind
As an expert in R&D Theories, TechMind can generates customized viable solutions instantly.
TechRisk
Analyze your overall solution with one click, know your potential R&D risks in advance.
TechMonitor
Get weekly tech updates, stay abreast of the latest tech innovations and key insights.
Patents
Literature
Hiro is an intelligent assistant for R&D personnel, combined with Patent DNA, to facilitate innovative research.
2775 results about "Birefringence" patented technology
Efficacy Topic
Property
Owner
Technical Advancement
Application Domain
Technology Topic
Technology Field Word
Patent Country/Region
Patent Type
Patent Status
Application Year
Inventor
Birefringence is the optical property of a material having a refractive index that depends on the polarization and propagation direction of light. These optically anisotropic materials are said to be birefringent (or birefractive). The birefringence is often quantified as the maximum difference between refractive indices exhibited by the material. Crystals with non-cubic crystal structures are often birefringent, as are plastics under mechanical stress.
Enhanced heat mirror films
ActiveUS7215473B2Function increaseImprove interlayer adhesionMirrorsSynthetic resin layered productsMetal alloyHot mirror
A heat mirror film containing visible light-transmissive and infrared reflective film comprising a birefringent dielectric multilayer support that reflects at least 50% of light in a band at least 100 nm wide in a wavelength region of interest, a metal or metal alloy layer whose thickness is such that the film is visible light-transmissive and its reflection band is broadened, and a crosslinked polymeric layer has improved infrared reflecting properties. The film can be joined or laminated into glazing (especially non-planar vehicular safety glazing) with reduced likelihood that the metal or metal alloy layer will be damaged or distorted.
Owner:3M INNOVATIVE PROPERTIES CO
Optical imaging device
An Optical Coherence Tomography (OCT) device irradiates a biological tissue with low coherence light, obtains a high resolution tomogram of the inside of the tissue by low-coherent interference with scattered light from the tissue, and is provided with an optical probe which includes an optical fiber having a flexible and thin insertion part for introducing the low coherent light. When the optical probe is inserted into a blood vessel or a patient's body cavity, the OCT enables the doctor to observe a high resolution tomogram. In a optical probe, generally, a fluctuation of a birefringence occurs depending on a bend of the optical fiber, and this an interference contrast varies depending on the condition of the insertion. The OCT of the present invention is provided with polarization compensation means such as a Faraday rotator on the side of the light emission of the optical probe, so that the OCT can obtain the stabilized interference output regardless of the state of the bend.
Owner:UNIVERSITY HOSPITALS OF CLEVELAND CLEVELAND +1
Polarization maintaining multi-core optical fiber
InactiveUS20130108206A1High densityField distribution is reducedOptical fibre with polarisationMulticore optical fibreLong axisOptical polarization
In a polarization maintaining multi-core optical fiber according to the present invention, structural birefringence is generated since an elliptic core is applied. In addition, each core is arranged so that a direction of a line connecting between centers of the nearest cores and a long axis direction of a field distribution in each core may be different from each other, and thereby, overlap of field distributions between the nearest cores is reduced. As a result, a crosstalk among cores is reduced.
Owner:SUMITOMO ELECTRIC IND LTD
Diffractive optical relay and method for manufacturing the same
InactiveUS20080043334A1Diffraction gratingsPlanar/plate-like light guidesRefractive indexCyclo olefin polymer
An optical relay device, comprising a substrate, and at least one diffractive optical element is disclosed. The substrate is made, at least in part, of a light transmissive polymeric material characterized by a birefringence, Δn, satisfying the inequality |Δn|<ε, where ε is lower than the birefringence of polycarbonate. In a preferred embodiment, the light transmissive polymeric material comprises a cycloolefin polymer or a cycloolefin copolymer.
Owner:MIRAGE INNOVATIONS
Simple high efficiency optical coherence domain reflectometer design
ActiveUS20050213103A1Reduce system costLow costReflectometers dealing with polarizationInterferometersBeam splitterDetector array
The present invention discloses simple and yet highly efficient configurations of optical coherence domain reflectometry systems. The combined use of a polarizing beam splitter with one or two polarization manipulator(s) that rotate the returned light wave polarization to an orthogonal direction, enables one to achieve high optical power delivery efficiency as well as fixed or predetermined output polarization state of the interfering light waves reaching a detector or detector array, which is especially beneficial for spectral domain optical coherence tomography. In addition, the system can be made insensitive to polarization fading resulting from the birefringence change in the sample and reference arms. Dispersion matching can also be easily achieved between the sample and the reference arm for high resolution longitudinal scanning.
Owner:CARL ZEISS MEDITEC INC
Fluorene derivatives
ActiveUS20100301271A1Increase polarizabilityLiquid crystal compositionsOrganic chemistryPolymer thin filmsSemiconductor
The invention relates to novel fluorene derivatives, which are especially suitable for use in birefringent films with negative optical dispersion, to novel liquid crystal (LC) formulations and polymer films comprising them, and to the use of the fluorene derivatives, formulations and films in optical, electrooptical, electronic, semiconducting or luminescent components or devices.
Owner:MERCK PATENT GMBH
4-Membered ring compound and optical phase optical retardation plate using the same
InactiveUS20030102458A1Liquid crystal compositionsCarbamic acid derivatives preparationSulfurSingle bond
A 4-membered compound is represented by the following formula (I) is disclosed (in the formula, X1 and X2 each independently represent an oxygen atom, a sulfur atom or a substituted or unsubstituted imino group, Y1 and Y2 each independently represent a single bond, an oxygen atom or a substituted or unsubstituted imino group, B1 and B2 each independently represent an optionally substituted aliphatic, aliphatic carbonyl, aromatic or aromatic carbonyl group having 1-20 carbon atoms, and A1 and A2 each independently represent a group represented by the following formula (II) (Ar1, Ar2 and Ar3 each independently represent a cyclic group having 5-14 carbon atoms, L1 and L2 each independently represent a single bond or a divalent linking group, and p represents an integer of 0-2)). There is also disclosed a birefringence medium containing a 4-membered compound represented by the formula (I) and an optical element comprising the birefringence medium.
Owner:FUJIFILM CORP
Hybrid electro-active lens
An electro-active lens is disclosed. The lens includes at least one electro-active cell to provide a lens having at least two focal lengths, the electro-active cell capable of adjusting its focal length based on voltages applied to the electro-active cell. The voltage is supplied by an alternating current source, including a flying capacitor circuit. The electro-active lenses reduce birefringence through the use of a single cholesteric liquid crystal electro-active cell.
Owner:E VISION LLC
Confocal self-interference microscopy from which side lobe has been removed
The present invention relates to confocal self-interference microscopy. The confocal self-interference microscopy further includes a first polarizer for polarizing reflected or fluorescent light from a specimen, a first birefringence wave plate for separating the light from the first polarizer into two beams along a polarizing direction, a second polarizer for polarizing the two beams from the first birefringence wave plate, a second birefringence wave plate for separating the two beams from the second polarizer into four beams along the polarizing direction, and a third polarizer for polarizing the four beams from the second birefringence wave plate, in the existing confocal microscopy. Optic-axes of the first and second birefringence wave plates exist on the same plane, optic-axes of the first and second birefringence wave plates are inclined from an optical axis of the entire optical system at a predetermined angle, and self-interference spatial periods of the first and second birefringence wave plates are different from each other.
Owner:KOREA ADVANCED INST OF SCI & TECH
Micromechanical and related lidar apparatus and method, and fast light-routing components
ActiveUS20060132752A1Small and light and less-powerfulIncrease illuminationOptical rangefindersElectromagnetic wave reradiationBeam splitterEngineering
Several systems and a method are taught for rapid modulation of a light beam in lidar and other imaging. Most of these involve micromechanical and other very small control components. One such unit is a light-switching fabric, based on displacement of liquid in a tube that crosses a junction of two optical waveguides. In some forms, the fabric is preferably flexible to enable folding or coiling to form a two-dimensional face that interacts with optical-fiber ends an opposed fiber bundle. The rapid operation of the switch fabric enables it to be used as a beam-splitter, separating incoming and return beams; and also to form pulses from supplied CW light. Other control components include micromechanical mirrors (e. g. MEMS mirrors) operated in arrays or singly, liquid-crystal devices, and other controlled-birefringence cells. Some of these devices are placed within an optical system for directional light-beam steering.
Owner:ARETE ASSOCIATES INC
Hybrid electro-active lens
Owner:E VISION OPTICS LLC
Reflective polarization valve engine and projection display using the same
InactiveUS20050024591A1High imaging performanceLow costProjectorsPolarising elementsDisplay devicePrism
Reflective polarization valve engine and projection display are disclosed. Instead of prism PBS, the projector applies wire-grid polarizers with advantages of higher heat-resistance, no limitation of the incident angle and no birefringence effects, to provide excellent contrast luminance. The light source in the projector utilizes an elliptical lamp under a telecentric optical system to achieve higher efficiency and avoid color gradient. In addition, the light paths are in special arrangement. The original beam is first splitted into RGB, and then proceeding with color-recombining right after being polarized via wire-grid polarizers and analyzed by reflective polarization valves. Hence, the analyzed beams finally are recombined images with superior performances.
Owner:DELTA ELECTRONICS INC
Liquid crystal display device
InactiveUS6801283B2Quality improvementIncrease contrastLiquid crystal compositionsStatic indicating devicesLiquid-crystal displayPolarizer
A liquid crystal display device has an elliptic polarizer consisting of a polarizer, a first retarder, and a second retarder, and a reflector reflecting light in a visual light range. Optimal values for a twist angle of a liquid crystal layer, an angle between a transmission axis of the polarizer and a slow axis of the first retarder, an angle between the slow axis of the first retarder and a slow axis of the second retarder, and a product of birefringence .DELTA.n of liquid crystal material used in the liquid crystal layer and a thickness d of the liquid crystal layer are evaluated.
Owner:MITSUBISHI ELECTRIC CORP
Space-variant waveplate for polarization conversion, methods and applications
InactiveUS20070115551A1Improve optical qualityPhotomechanical apparatusPolarising elementsPupilOptical polarization
Embodiments of the invention are directed to apparatus and methods for converting spatially homogeneously polarized light into spatially inhomogeneously polarized light having a fast axis orientation that varies in a smooth and continuous manner over a pupil aperture. A space-variant waveplate referred to herein as a polarization converter includes an optically transmissive window characterized by a symmetric stress birefringence that provides at least λ / 4 retardance and, more particularly, λ / 2 retardance over an annular region centered about the optical axis of the window. Structural embodiments of the polarization converter include a mechanical compression housing and a thermal compression housing. Radially and azimuthally polarized vortex beams including cylindrical vector beams and counter-rotating beams can be generated from uniformly plane polarized input beams propagating through the polarization converter. Low-order polarization vortex beams can be optically combined to produce higher-order scalar vortex beams. Embodiments of the invention are also directed to various optical illumination and imaging systems utilizing the apparatus and methods described herein.
Owner:SPILMAN ALEXIS +1
Simple high efficiency optical coherence domain reflectometer design
ActiveUS7126693B2Improve efficiencySimple configurationReflectometers dealing with polarizationInterferometersBeam splitterDetector array
The present invention discloses simple and yet highly efficient configurations of optical coherence domain reflectometry systems. The combined use of a polarizing beam splitter with one or two polarization manipulator(s) that rotate the returned light wave polarization to an orthogonal direction, enables one to achieve high optical power delivery efficiency as well as fixed or predetermined output polarization state of the interfering light waves reaching a detector or detector array, which is especially beneficial for spectral domain optical coherence tomography. In addition, the system can be made insensitive to polarization fading resulting from the birefringence change in the sample and reference arms. Dispersion matching can also be easily achieved between the sample and the reference arm for high resolution longitudinal scanning.
Owner:CARL ZEISS MEDITEC INC
Method and apparatus for measuring and monitoring optical properties based on a ring-resonator
InactiveUS20060227331A1Conveniently frequency measurementEasy to measurePhase-affecting property measurementsUsing optical meansGratingRefractive index
A method and apparatus for performing refractive index, birefringence and optical activity measurements of a material such as a solid, liquid, gas or thin film is disclosed. The method and apparatus can also be used to measure the properties of a reflecting surface. The disclosed apparatus has an optical ring-resonator in the form of a fiber-loop resonator, or a race-track resonator, or any waveguide-ring or other structure with a closed optical path that constitutes a cavity. A sample is introduced into the optical path of the resonator such that the light in the resonator is transmitted through the sample and relative and / or absolute shifts of the resonance frequencies or changes of the characteristics of the transmission spectrum are observed. A change in the transfer characteristics of the resonant ring, such as a shift of the resonance frequency, is related to a sample's refractive index (refractive indices) and / or change thereof. In the case of birefringence measurements, rings that have modes with two (quasi)-orthogonal (linear or circular) polarization states are used to observe the relative shifts of the resonance frequencies. A reflecting surface may be introduced in a ring resonator. The reflecting surface can be raster-scanned for the purpose of height-profiling surface features. A surface plasmon resonance may be excited and phase changes of resonant light due to binding of analytes to the reflecting surface can be determined in the frequency domain.
Owner:PRESIDENT & FELLOWS OF HARVARD COLLEGE
Driving method of liquid crystal display device
The present invention relates to a driving method of a liquid crystal display device using an OCB (optically compensated birefringence) which realizes a wide view-field angle and high-speed response, and has an object of providing a driving method of a liquid crystal display device which method causes an OCB cell to transfer from a splay orientation state to a bend orientation state in short time. In a driving method of a liquid crystal display device using an OCB cell, gate on / off periods of a TFT are controlled at a start of a display operation, each pixel is caused to have bend orientation by a strong electric field that is generated between a gate electrode and a common electrode, and, at the same time, a voltage that is higher than that to generate an electric field necessary to maintain bend orientation is applied between a display electrode and the common electrode, to thereby effect transfer to bend orientation in short time.
Owner:AU OPTRONICS CORP
Liquid crystal display device
InactiveUS7245336B2Wide viewing angleReduce power consumptionNon-linear opticsLiquid-crystal displayPolarizer
Owner:PANASONIC LIQUID CRYSTAL DISPLAY CO LTD +1
Apparatus and method for the complete characterization of optical devices including loss, birefringence and dispersion effects
InactiveUS6856400B1Reflectometers dealing with polarizationMaterial analysis by optical meansOptical frequenciesCurve fitting
In order to characterize the optical characteristics of a device, a source of light having a variable frequency with a polarization state which varies linearly with frequency is provided as an input to the device under test. The input light is also passed through a known reference path and is added to the light output from the device under test in a beam combiner. The combined light for the frequencies of interest is split into two orthogonal polarizations which are then detected in a spectral acquisition apparatus and supplied to a microprocessor. The spectral measurements are digitized and curve-fitted to provide optical power versus optical frequency curves. Fourier transforms of each of the curves are calculated by the microprocessor. From the Fourier transforms, the four arrays of constants are calculated for the Jones matrix characterizing the device under test.
Owner:INTUITIVE SURGICAL OPERATIONS INC
All Optical System and Method for Providing Extended Depth of Focus of Imaging
InactiveUS20090116096A1High quality imagingPrecise designPolarising elementsNon-linear opticsCamera lensImaging lens
An imaging system and method are presented. The system comprises an imaging lens unit, an imaging detector, and a birefringent element located between the imaging lens unit and the imaging detector. The system is thus configure and operable to provide in-focus imaging of objects located at both near-field and far-field ranges. Also provided is an optical device configured to be mounted on an imaging lens, being one of the following: a lens of an individual's glasses, on a contact lens, and an eye internal lens. The optical device is configured to be located between the imaging lens and the retina and comprises a birefringent element, to thereby provide in-focus imaging onto the retina of the objects located at both near-field and far-field ranges therefrom.
Owner:BRIEN HOLDEN VISION INST (AU)
Birefringent reflectors using isotropic materials and form birefringence
Multilayer thin film reflectors, such as mirrors and reflective polarizers, are described in which form birefringent optical layers are incorporated into a plurality of optical repeat units in the film. The form birefringent layers exhibit birefringence as a result of microscopic structures that have a dimension that is small compared to the wavelength of light but large compared to molecular distances. The optical layers within the optical repeat units have out-of-plane indices of refraction that are tailored to produce desired effects as a function of incidence angle for p-polarized light. The multilayer reflectors can be made by conventional vacuum deposition techniques using known inorganic optical materials, but can also be made entirely with polymeric materials by co-extrusion or other processes.
Owner:3M INNOVATIVE PROPERTIES CO
Liquid crystal display apparatus
InactiveUS7787077B2Good bright display state free from unevennessStatic indicating devicesNon-linear opticsLiquid-crystal displayPolarizer
Owner:SAMSUNG ELECTRONICS CO LTD
Plastic substrates for electronic display applications
Disclosed is the use of certain polyglutarimides as plastic substrates for use in electronic display applications. These substrates have relatively high Tgs for plastics, and good optical clarity and flatness, with low shrinkage and low birefringence. Also disclosed are electronic display cells made using such polyglutarimide substrates.
Owner:ROHM & HAAS CO
Liquid Crystal Display Device
ActiveUS20080259254A1High response rateQuality improvementLiquid crystal compositionsNon-linear opticsIn planeDopant
[PROBLEMS] To provide a liquid crystal display device that does not need any surface aligning treatment, realizes striking increase of a response speed of movie display and is free from any light leakage (produce dark field) at black display.[MEANS FOR SOLVING PROBLEMS] There is provided a liquid crystal display device comprising a pair of transparent substrates and, interposed therebetween, a polymer stabilized blue-phase liquid crystal. The liquid crystal display device utilizing the polymer stabilized blue-phase liquid crystal exhibits a large birefringence change upon application of an electric field to cell substrate in an in-plane direction. The polymer stabilized blue-phase liquid crystal is composed of a low-molecular liquid crystal capable of developing a blue phase between cholesteric phase and isotropic phase and a polymer network created in the low-molecular liquid crystal. Further, by optimizing the type and amount of chiral dopant added to the liquid crystal, there can be provided a liquid crystal display device that is free from any light leakage (produce dark field) at black display.
Owner:JAPAN SCI & TECH CORP
Optical Coherence Tomography Laser with Integrated Clock
A frequency swept laser source for TEFD-OCT imaging includes an integrated clock subsystem on the optical bench with the laser source. The clock subsystem generates frequency clock signals as the optical signal is tuned over the scan band. Preferably the laser source further includes a cavity extender in its optical cavity between a tunable filter and gain medium to increase an optical distance between the tunable filter and the gain medium in order to control the location of laser intensity pattern noise. The laser also include a fiber stub that allows for control over the cavity length while also controlling birefringence in the cavity.
Owner:EXCELITAS TECH
Cellulose Ester Compositions Having Low Bifringence and Films Made Therefrom Comprising a Plasticizer
The present invention relates to cellulose esters having low hydroxyl content for use in optical applications, such as liquid crystal display (LCD) films. Films made with low hydroxyl levels and a given ratio of non-acetyl ester to hydroxyl level have been found to have low intrinsic birefringence. Therefore, these films can be cast, molded, or otherwise oriented without an appreciable birefringence or optical distortion (i.e. retardation). Such features make these films useful in polarizer, protective, and compensator films as well as molded optical parts, such as lenses. Furthermore, it has also been found that resins of the present invention can also be made to have “+C plate” behavior either by melt or solvent based processing, a characteristic which is not typical of cellulose esters. Such +C behavior allows films to be produced having unique compensatory behavior. Other embodiments of the invention relate to methods melt casting films while minimizing birefringence formation. Another embodiment of the invention is directed to films made from the cellulose esters described herein further comprising a plasticizer.
Owner:EASTMAN CHEM CO
Illumination system for a microlithographic projection exposure apparatus
InactiveUS20060055909A1Avoid contactUndesired directionPhotomechanical exposure apparatusPhotographic printingHigh energyOptoelectronics
An illumination system for a microlithographic projection exposure apparatus has a first polarization manipulator, a second polarization manipulator and at least one optical element located between these manipulators. The polarization manipulators ensure that the direction of the electric field vector of a light ray varies in time between the polarization manipulators, whereas the polarization state is fixed outside the polarization manipulators. This prevents high energy light from inducing birefringence in optical elements arranged between the two polarization manipulators.
Owner:CARL ZEISS SMT GMBH
Fast model-based optical proximity correction
InactiveUS7079223B2Method is fastPhotomechanical exposure apparatusMicrolithography exposure apparatusResistDecomposition
A method and system is provided for computing lithographic images that may take into account non-scalar effects such as lens birefringence, resist stack effects, tailored source polarizations, and blur effects of the mask and the resist. A generalized bilinear kernel is formed, which is independent of the mask transmission function, and which may then be treated using a decomposition to allow rapid computation of an image that includes such non-scalar effects. Weighted pre-images may be formed from a coherent sum of pre-computed convolutions of the dominant eigenfunctions of the generalized bilinear kernel with the appropriate mask polygon sectors. The image at a point may be formed from the incoherent sum of the weighted pre-images over all of the dominant eigenfunctions of the generalized bilinear kernel. The resulting image can then be used to perform model-based optical proximity correction (MBOPC).
Owner:GLOBALFOUNDRIES INC
Method and apparatus for measuring micro structures, anisotropy and birefringence in polymers using laser scattered light
InactiveUS6097488AGood process reproducibilityImprove efficiencyPolarisation-affecting propertiesLight polarisation measurementMicro structureFiber
A method and apparatus for measuring microstructures, anistropy and birefringence in polymers using laser scattered light includes a laser which provides a beam that can be conditioned and is directed at a fiber or film which causes the beam to scatter. Backscatter light is received and processed with detectors and beam splitters to obtain data. The data is directed to a computer where it is processed to obtain information about the fiber or film, such as the birefringence and diameter. This information provides a basis for modifications to the production process to enhance the process.
Owner:PRINCETON UNIV
Cellulose Ester Compositions Having Low Bifringence and Films Made Therefrom
The present invention relates to cellulose esters having low hydroxyl content for use in optical applications, such as liquid crystal display (LCD) films. Films made with low hydroxyl levels and a given ratio of non-acetyl ester to hydroxyl level have been found to have low intrinsic birefringence. Therefore, these films can be cast, molded, or otherwise oriented without an appreciable birefringence or optical distortion (i.e. retardation). Such features make these films useful in polarizer, protective, and compensator films as well as molded optical parts, such as lenses. Furthermore, it has also been found that resins of the present invention can also be made to have “+C plate” behavior either by melt or solvent based processing, a characteristic which is not typical of cellulose esters. Such +C behavior allows films to be produced having unique compensatory behavior. Other embodiments of the invention relate to methods melt casting films while minimizing birefringence formation.
Owner:EASTMAN CHEM CO
Who we serve
- R&D Engineer
- R&D Manager
- IP Professional
Why Patsnap Eureka
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com