For Beam Steering Patents (Class 349/202)
  • Patent number: 10261388
    Abstract: A device includes a waveguide grating out-coupler, and a tunable uniform phase shifter communicating with the waveguide grating out-coupler. The tunable uniform phase shifter steers a Hat phase front along a first angle in a first plane. Optionally, the waveguide grating out-coupler includes a modulated refractive index and a physical grating period. The tunable uniform phase shifter controls the refractive index, thereby controlling an effective grating period. The grating period relates to die modulated refractive index, and the physical grating period. Optionally, the tunable uniform phase shifter includes a first thermo-optic phase shifter, a first electro-optic phase shifter, or a first micro-electro-mechanical system index perturbation phase shifter. Optionally, the tunable linear gradient phase shifter communicates with the waveguide grating out-coupler and steers a beam along the flat phase front along a second angle in a second plane, which is perpendicular to the first plane.
    Type: Grant
    Filed: February 27, 2018
    Date of Patent: April 16, 2019
    Assignee: The United States of America, as represented by the Secretary of the Navy
    Inventors: Marcel W. Pruessner, William S. Rabinovich, Rita Mahon, Peter G. Goetz
  • Patent number: 10021794
    Abstract: Disclosed is a display device for realizing a transparent image. The display device includes a display panel, a source printed circuit board (PCB) on which a signal line is mounted, a control PCB on which a timing controller is mounted, and a circuit film connected to the display panel at one side of the circuit film and connected to the source PCB at another side. The source PCB and the control PCB are disposed to overlap each other.
    Type: Grant
    Filed: November 8, 2016
    Date of Patent: July 10, 2018
    Assignee: LG DISPLAY CO., LTD.
    Inventors: Jin-Hyun Jung, BuYeol Lee
  • Patent number: 9971146
    Abstract: A laser apparatus comprising an aperture module array including two or more aperture modules, each aperture module of the array being optically couple-able to a source of coherent electromagnetic radiation and configured to emit a beam of radiation received from the source. The apparatus emits a composite beam comprising beams emitted by the respective aperture modules and modulates at least one of the beams in power and phase relative to at least one other of the beams such that a desired non-uniform composite beam profile is provided.
    Type: Grant
    Filed: October 1, 2014
    Date of Patent: May 15, 2018
    Assignee: Lockheed Martin Corporation
    Inventors: Dennis John Adams, Thomas Gustav Alley, Emanuel Solomon Stockman
  • Patent number: 9632298
    Abstract: A laser scanning microscope, which is switchable between different operating modes, wherein it contains, for switching in the illumination beam path, an electro-optical modulator (EOM) in a first beam path, which electro-optical modulator has arranged, upstream and downstream of it, adjustable first and second polarization-rotating elements and, downstream of it, at least one first polarization splitter for producing a second beam path, in which light-influencing means are located, wherein one or more of the following operating modes of the LSM can be set:—Single spot LSM—multispot LSM—single spot FMM—multispot FMM—FRAP system.
    Type: Grant
    Filed: September 29, 2011
    Date of Patent: April 25, 2017
    Assignee: Carl Zeiss Microscopy GmbH
    Inventors: Tiemo Anhut, Thomas Kalkbrenner, Daniel Schwedt
  • Patent number: 9151971
    Abstract: A liquid crystal lens is comprises: a plurality of lens units (1), and a driver circuit electrically-connected with the plurality of lens units respectively; each lens unit comprises: a common electrode (11), a signal electrode opposite to the common electrode, and a liquid crystal layer provided between the common electrode and the signal electrode; each signal electrode comprises: one or two conductive wires (25) with one end being electrically-connected to the driver circuit, and a resistive block (22) provided on a second substrate and opposite to the common electrode. The resistive block is electrically-connected with the conductive wire(s). Where the driver circuit applies a drive voltage through the conductive wire(s) to the resistive block, the liquid crystal layer provided between the resistive block and the common electrode has a lens function. A stereoscopic display device comprising a same liquid crystal lens is also disclosed.
    Type: Grant
    Filed: December 5, 2013
    Date of Patent: October 6, 2015
    Assignee: BOE TECHNOLOGY GROUP CO., LTD
    Inventor: Yanbing Wu
  • Patent number: 8982313
    Abstract: A beam steering apparatus includes a first beam steering stage and at least a second beam steering stage arranged in-line with the first beam steering stage. The first beam steering stage includes a first polarization grating comprising a uniaxial birefringent material having a first periodic director pattern, and the second beam steering stage includes a second polarization grating comprising a uniaxial birefringent material having a second periodic director pattern. In nonmechanical embodiments, a polarization selector may be arranged to provide a circularly polarized input beam incident on the first polarization grating. In mechanical embodiments, at least one of the first polarization grating and the second polarization grating may be operable to be independently rotated about an azimuth thereof. Related methods of operation are also discussed.
    Type: Grant
    Filed: July 30, 2010
    Date of Patent: March 17, 2015
    Assignees: North Carolina State University, Boulder Nonlinear Systems, Inc.
    Inventors: Michael J. Escuti, Jihwan Kim, Chulwoo Oh, Steven Serati
  • Publication number: 20150002804
    Abstract: A method for directing light beams includes generating a light beam along a light path. A voltage differential is created by generating a voltage in a first and second linear electrode contacts arranged such that the first and second linear electrical contacts alternate with each other. The light path is altered by passing the light beam through a liquid crystal device coupled to the first and second linear electrical contacts.
    Type: Application
    Filed: June 25, 2014
    Publication date: January 1, 2015
    Inventor: Sajjad A. Khan
  • Patent number: 8891052
    Abstract: Included is a light emitting unit, an optical deflector, a control unit, and a liquid crystal panel. The optical deflector includes a first optical deflector and a second optical deflector which are arranged side by side in a direction from a light incident side to a light emitting side. A maximum light deflection angle of the first optical deflector is smaller than a maximum light deflection angle of the second optical deflector, and a maximum light deflection speed of the first optical deflector is higher than a maximum light deflection speed of the second optical deflector. The first optical deflector includes a first optical deflection layer and a second optical deflection layer stacked in the direction from the light incident side to the light emitting side. Each of the first and second optical deflection layers includes the liquid crystal deflection elements arranged in the planar state.
    Type: Grant
    Filed: July 13, 2012
    Date of Patent: November 18, 2014
    Assignee: Panasonic Corporation
    Inventors: Keiji Sugiyama, Shinichi Shikii
  • Patent number: 8867016
    Abstract: Methods, systems, and apparatus, for optical switching. In one aspect, a wavelength selective switch includes one or more optical input ports; one or more optical output ports; a first optical wavelength dispersion element configured to separate the plurality of wavelength channels of the input optical beam; a second optical wavelength dispersion element configured to combine two or more separate optical beams each having one or more different wavelengths, into a combined beam having the plurality of wavelength channels; a polarization modulator array configured to independently change a polarization orientation of an optical beam passing through; optical components for directing optical beams corresponding to respective wavelength channels to different polarizing modulation cells; and a polarization beam splitter configured to route received optical beams to particular output paths according to polarization orientation.
    Type: Grant
    Filed: March 12, 2012
    Date of Patent: October 21, 2014
    Assignee: Oplink Communications, Inc.
    Inventors: Hongwei Mao, Lifu Gong, Tian Zhu, Jian Liu
  • Patent number: 8854597
    Abstract: An optical switching device has multiple input ports and multiple output ports and is capable of switching a wavelength component from any of the input ports to any of the output ports. The optical switching device is configured with beam steering arrays that are controlled to provide the switching from any of the input ports to any of the output ports. The beam steering arrays may be microelectromechanical (MEMS) mirror arrays or liquid-crystal on silicon (LCOS) panels. In addition, an array of beam-polarizing liquid-crystal elements provides wavelength-independent attenuation.
    Type: Grant
    Filed: March 13, 2012
    Date of Patent: October 7, 2014
    Assignee: Finisar Corporation
    Inventors: Manish Sharma, Gil Cohen
  • Patent number: 8797499
    Abstract: A liquid crystal lens or beam steering device is made by programming alignment surfaces of the LC cell walls using a programming field to align the alignment surface molecules before fixing them. By setting the desired pre-tilt, the lens can operate in the absence of the control field, and power consumption by the control field can be reduced.
    Type: Grant
    Filed: July 14, 2009
    Date of Patent: August 5, 2014
    Assignee: Lensvector Inc.
    Inventor: Tigran Galstian
  • Patent number: 8721092
    Abstract: A substrate guided relay includes multiple output couplers and multiple light valves positioned between the substrate and the output couplers. The number of light valves may be equal to the number of output couplers, or may be more or less than the number of output couplers. The light valves may be enabled sequentially, or may be enabled based on the position of a user's eye. The light valves may include liquid crystal material.
    Type: Grant
    Filed: May 9, 2012
    Date of Patent: May 13, 2014
    Assignee: Microvision, Inc.
    Inventors: Christian Dean DeJong, Markus Duelli
  • Patent number: 8687165
    Abstract: An imaging system for imaging an object onto an image sensor, and which has a front side facing the object and a rear side facing away from the object, the rear side being arranged behind the front side as viewed from the object. Furthermore, the imaging system has a light entrance device at the front side through which light coming from the object can enter into the imaging system. In this case, the light traverses the beam path between object and image sensor. At least one first and one second optical element are likewise present and are arranged at the rear side in such a way that they can influence the beam path. The light entrance device has an electrically switchable liquid crystal element which deflects the beam path at at least one first angle and a second angle which is different from the first angle depending on the electrical switching state. A discretely switchable focal length change is realized by this electrically effected change in the beam path.
    Type: Grant
    Filed: February 16, 2011
    Date of Patent: April 1, 2014
    Assignee: Jos. Schneider Optische Werke GmbH
    Inventor: Lingli Wang
  • Patent number: 8643822
    Abstract: A method of fabricating an optical element including a liquid crystal layer having a spatially-varying tilt angle includes coating a substrate with a linearly photopolymerizable polymer layer, irradiating the linearly photopolymerizable polymer layer with linearly polarized ultra-violet light at a oblique angle, and coating a layer of liquid crystal material on a surface of the irradiated linearly photopolymerizable polymer layer. The liquid crystal material has a predetermined relationship between its tilt angle and a total dose of the linearly polarized ultra-violet light. The linearly photopolymerizable polymer layer is irradiated with at least one dose of linearly polarized ultra-violet light that is sufficient to induce formation of a plurality of discrete regions within the liquid crystal layer having a larger in-plane birefringence than an adjacent or surrounding region.
    Type: Grant
    Filed: August 6, 2010
    Date of Patent: February 4, 2014
    Assignee: JDS Uniphase Corporation
    Inventors: Kim Leong Tan, David M. Shemo
  • Patent number: 8564756
    Abstract: An optical system includes at least one lens and a liquid crystal optical element. The liquid crystal optical element is constructed so that a first liquid crystal lens and a second liquid crystal lens are oppositely arranged so that orientation directions cross at right angles with each other in a plane perpendicular to the optical axis, a voltage applied to the liquid crystal optical element is controlled and a shift of a focal position relative to incident light from a different object point is corrected, and when the liquid crystal optical element does not have a ray deflecting action, a far object point is brought into focus, while when the liquid crystal optical element has the ray deflecting action, a near object point is brought into focus.
    Type: Grant
    Filed: June 9, 2008
    Date of Patent: October 22, 2013
    Assignee: Olympus Corporation
    Inventor: Keiichi Kuba
  • Patent number: 8553197
    Abstract: A variable optical device for controlling the propagation of light has a liquid crystal layer (1), electrodes (4) arranged to generate an electric field acting on the liquid crystal layer, and an electric field modulation layer (3,71) arranged between the electrodes and adjacent the liquid crystal layer for spatially modulating said electric field in a manner to control the propagation of light passing through said optical device. The electric field modulation layer has either an optical index of refraction that is essentially spatially uniform, or a polar liquid or gel, or a very high low frequency dielectric constant material having a dielectric constant greater than 20, and preferably greater than 1000.
    Type: Grant
    Filed: December 7, 2010
    Date of Patent: October 8, 2013
    Assignee: Universite Laval
    Inventors: Tigran Galstian, Vladimir Presniakov, Karen Asatryan
  • Patent number: 8537310
    Abstract: A liquid crystal device includes a first polarization grating (101), a second polarization grating (102), and a liquid crystal layer (103). The first polarization grating (101) is configured to polarize and diffract incident light (190) into first and second beams (195,196) having different polarizations and different directions of propagation relative to that of the incident light (190). The liquid crystal layer (103) is configured to receive the first and second beams (195,196) from the first polarization grating (101). The liquid crystal layer (103) is configured to be switched between a first state that does not substantially affect respective polarizations of the first and second beams (195,196) traveling therethrough, and a second state that alters the respective polarizations of the first and second beams (195,196) traveling therethrough.
    Type: Grant
    Filed: October 9, 2008
    Date of Patent: September 17, 2013
    Assignee: North Carolina State University
    Inventors: Michael James Escuti, Chulwoo Oh, Ravi Komanduri, Brandon L. Conover, Jihwan Kim
  • Patent number: 8531646
    Abstract: An electro-optical device comprises a liquid crystal material disposed in a cell and electrodes configured to bias the liquid crystal material into a generally in-plane director configuration having a non-constant spatial pattern selectable or adjustable by an in-plane component of the biasing to produce a desired refractive of diffractive optical effect.
    Type: Grant
    Filed: September 11, 2008
    Date of Patent: September 10, 2013
    Assignee: Kent State University
    Inventors: Lei Shi, Philip J. Bos, Paul F. Manamon
  • Publication number: 20130202246
    Abstract: Devices and systems to perform optical alignment by using one or more liquid crystal layers to actively steer a light beam from an optical fiber to an optical waveguide integrated on a chip. An on-chip feedback mechanism can steer the beam between the fiber and a grating based waveguide to minimize the insertion loss of the system.
    Type: Application
    Filed: February 3, 2012
    Publication date: August 8, 2013
    Inventors: Roy Meade, Gurtej Sandhu
  • Patent number: 8427725
    Abstract: The present invention relates to a light modulating device, comprising a SLM and a pixelated optical element, in which a group of at least two adjacent pixels of the SLM in combination with a corresponding group of pixels in the pixelated optical element form a macropixel, the pixelated optical element being of a type such that its pixels comprise a fixed content, each macropixel being used to represent a numerical value which is manifested physically by the states of the pixels of the SLM and the content of the pixels of the pixelated optical element which form the macropixel.
    Type: Grant
    Filed: October 20, 2008
    Date of Patent: April 23, 2013
    Assignee: Seereal Technologies S.A.
    Inventors: Gerald Futterer, Bo Kroll, Steffen Buschbeck
  • Patent number: 8395714
    Abstract: An imaging system (200), such as a scanned laser projection system, includes one or more laser sources (201) configured to produce one or more light beams (204), and a light modulator (203) configured to produce images (206) from the light beams (204). Optional optical alignment devices (220) can be used to orient the light beams (204) into a combined light beam (205). A beam separator (221), which can be any of a birefringent wedge, compensated birefringent wedge, or a polymerized liquid crystal layer, is disposed between at least one of the laser sources (201) and the light modulator (203). The beam separator (221) is configured to receive light from the laser sources (201) and deliver two angularly separated and orthogonally polarized light beams (223) to the light modulator (203) so as to reduce speckle appearing when the images (206) are displayed on a display surface (207).
    Type: Grant
    Filed: September 4, 2009
    Date of Patent: March 12, 2013
    Assignee: Microvision, Inc.
    Inventors: Alban N. Lescure, Markus Duelli, Mark O. Freeman
  • Publication number: 20120300168
    Abstract: An optically transparent electrically conductive structure having: an optically transparent substrate; an optically transparent buffer and barrier layers; a plurality of optically transparent, two-dimensional electron gas (2-DEG) carrier layers disposed on the substrate. A barrier layer is disposed over a corresponding one of the carrier layers. One of the carrier layers comprises: a GaN channel layer and wherein the barrier layer is Al1-xInxN or Al5yGa1-6yInyN where 0.10<x<0.30 and 0.05<y<0.17.
    Type: Application
    Filed: May 23, 2011
    Publication date: November 29, 2012
    Applicant: Raytheon Company
    Inventor: William E. Hoke
  • Patent number: 8300206
    Abstract: The present invention provides an electro-optic unit. A lens unit disposed at an upper portion of a display panel has a plurality of lens part. An electro-optic unit is disposed between a display panel and a lens unit, and includes an electro-optic material layer formed as a graded refractive index lens in an electric field. A display device shows a two-dimensional and a three-dimensional image according to a mode of the electro-optic unit. A driving part may form the graded refractive index lens to have the same pitch as the pitch of the lens part. The graded refractive index lens may be formed as a convex lens or a Fresnel lens. The electro-optic unit is displayed to form the Fresnel lens. A driving method enhancing mode conversion velocity of the electro-optic unit is displayed.
    Type: Grant
    Filed: July 29, 2009
    Date of Patent: October 30, 2012
    Assignee: Samsung Display Co., Ltd.
    Inventors: Sung-Woon Kim, Hee-Seop Kim, Hae-Young Yun, Jiangang Lu, Kyung-Ho Jung, Seung-Hoon Lee
  • Patent number: 8154690
    Abstract: A polarized-light splitting device includes a transmissive base member having a base portion and pattern of ridges on the base portion, and a non-transmissive layer on the ridges, wherein the non-transmissive layer includes a light reflecting portion, and a light absorbing portion.
    Type: Grant
    Filed: June 27, 2007
    Date of Patent: April 10, 2012
    Assignee: Cheil Industries, Inc.
    Inventors: Yoshihide Nagata, Atsushi Sato, Hitomu Watanabe, Ji Woo Kim
  • Patent number: 8149495
    Abstract: A reflective display, comprising a plurality of pixels (10), each having a first electrode, a light-modifying layer (12), and a second electrode (3; 16) arranged to enable formation of an electric field in the light-modifying layer (12) through application of a voltage between the electrodes. The pixel (10) further includes an active portion (16) which is switchable between light-modifying states by means of said electric field, and an inactive portion (17). The inactive portion (17) is arranged for reflecting light so as to direct at least a fraction of incoming light (20) impinging on the inactive portion (17) towards the active portion (16). As a result, a contrast ratio of the reflective display is improved, since light is now directed from the inactive portion towards the active portion and thus contributes to the displayed image as observed by a viewer.
    Type: Grant
    Filed: December 11, 2006
    Date of Patent: April 3, 2012
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Sander Jurgen Roosendaal, Martinus Hermanus Wilhelmus Maria Van Delden
  • Publication number: 20110273657
    Abstract: The invention relates to optical beam steering. There is described an optical beam steering apparatus, comprising: a splitter arranged to split an optical beam into at least a first part having a first polarisation and a second part having a second polarisation, said first and second polarisations being substantially mutually orthogonal; a first liquid crystal device region arranged to receive said first part and to have director orientation substantially aligned to said first polarisation; and a second liquid crystal device region arranged to receive said second part and to have director orientation substantially aligned to said second polarisation.
    Type: Application
    Filed: November 13, 2009
    Publication date: November 10, 2011
    Applicant: CAMBRIDGE ENTERPRISE LIMITED
    Inventors: Neil Collings, William Crossland, Maura Michelle Redmond, John Richard Moore, David Nugent, Brian Robertson
  • Patent number: 8014070
    Abstract: A method of fabricating a membrane structure for a diffractive phased array assembly is provided. The method includes the steps of providing a wafer having a body and at least a membrane layer and a backside layer disposed on opposite faces of the body, forming a grating pattern on a surface of the membrane layer, and forming a window through the wafer to expose a back surface of the membrane, thereby allowing light to pass through the membrane.
    Type: Grant
    Filed: July 21, 2010
    Date of Patent: September 6, 2011
    Assignee: Rosemount Aerospace Inc,
    Inventor: Michael P. Nesnidal
  • Patent number: 8007877
    Abstract: To provide a liquid crystal optical modulation element which is excellent in durability against blue laser and which can maintain the characteristics for a long period of time. A liquid crystal optical modulation element to modulate a laser beam having a wavelength of at most 500 nm, which comprises a layer of a polymer liquid crystal composition sandwiched between a pair of transparent substrates facing each other, characterized in that each of the pair of transparent substrates has an alignment film on the surface which faces the other transparent substrate, and the polymer liquid crystal composition is a polymer liquid crystal containing a hindered amine compound and a hindered phenol compound.
    Type: Grant
    Filed: October 22, 2010
    Date of Patent: August 30, 2011
    Assignee: Asahi Glass Company, Limited
    Inventors: Kara Yoshida, Yuriko Kaida, Hiromichi Nagayama, Hiroshi Kumai
  • Publication number: 20110116017
    Abstract: Systems and methods for electronically controlling the viewing angle of a display using liquid crystal optical elements are provided. Each liquid crystal optical element may be associated with a respective scattering module and may selectively steer a device generated light beam to one of two or more scattering regions of its associated scattering module. When a scattering region receives a steered light beam, the steered light beam may be scattered into a viewing cone having at least one viewing angle defined by a characteristic of that scatter region. Each liquid crystal optical element may be made from one or more suitable liquid crystal materials that can be controlled electronically to vary the effective index of refraction of one or more different regions of the liquid crystal optical element, thereby steering incoming light towards a particular one of two or more scattering regions of an associated scattering module.
    Type: Application
    Filed: November 19, 2009
    Publication date: May 19, 2011
    Applicant: Apple Inc.
    Inventor: David S. Gere
  • Patent number: 7940457
    Abstract: In an aspect, described herein is a dynamically controllable optoelectronic smart window which utilizes a diffraction grating for selective transmission or rejection of a specific region of the electromagnetic spectrum, for example the infrared, near-infrared and/or visible regions. Window embodiments described herein may further utilize a selectively controlled and/or patterned total internal reflection layer to assist with the selective rejection of a specific spectral region while allowing for transmission of another specific spectral region. In another aspect, the present invention provides methods for dynamically controlling the transmission or rejection of solar near-infrared and/or visible radiation.
    Type: Grant
    Filed: August 29, 2008
    Date of Patent: May 10, 2011
    Assignee: The Board of Trustees of the University of Illinois
    Inventors: Kanti Jain, Linus Jang, Yoon Soo Han
  • Patent number: 7907331
    Abstract: The use of spatial light modulators to steer light beams is disclosed. A dual frequency liquid crystal spatial light modulator can be controlled so as to form a blazed phase grating thereon that effects desire deflection of incident light.
    Type: Grant
    Filed: November 9, 2009
    Date of Patent: March 15, 2011
    Assignee: The Boeing Company
    Inventors: Jonathan M. Maram, Jeffrey H. Hunt
  • Patent number: 7859640
    Abstract: A variable optical device for controlling the propagation of light has a liquid crystal layer (1), electrodes (4) arranged to generate an electric field acting on the liquid crystal layer, and an electric field modulation layer (3,71) arranged between the electrodes and adjacent the liquid crystal layer for spatially modulating said electric field in a manner to control the propagation of light passing through said optical device. The electric field modulation layer has either an optical index of refraction that is essentially spatially uniform, or a polar liquid or gel, or a very high low frequency dielectric constant material having a dielectric constant greater than 20, and preferably greater than 1000.
    Type: Grant
    Filed: March 5, 2007
    Date of Patent: December 28, 2010
    Assignee: Universite Laval
    Inventors: Tigran Galstian, Vladimir Presniakov, Karen Asatryan
  • Patent number: 7846515
    Abstract: To provide a liquid crystal optical modulation element which is excellent in durability against blue laser and which can maintain the characteristics for a long period of time. A liquid crystal optical modulation element to modulate a laser beam having a wavelength of at most 500 nm, which comprises a layer of a polymer liquid crystal composition sandwiched between a pair of transparent substrates facing each other, characterized in that each of the pair of transparent substrates has an alignment film on the surface which faces the other transparent substrate, and the polymer liquid crystal composition is a polymer liquid crystal containing a hindered amine compound and a hindered phenol compound.
    Type: Grant
    Filed: February 26, 2010
    Date of Patent: December 7, 2010
    Assignee: Asahi Glass Company, Limited
    Inventors: Kara Yoshida, Yuriko Kaida, Hiromichi Nagayama, Hiroshi Kumai
  • Patent number: 7843404
    Abstract: The present invention provides a smart mirror apparatus using an LCD panel. The smart mirror of the present invention includes a reflective mirror, which is provided in the vehicle, and an LCD panel, which is placed in a light path between the reflective mirror and eyes of the driver and has one or two polarizing sheets. The smart mirror further includes an incident light detecting unit, which detects both the brightness of the incident light transmitted from the rear to the LCD panel and the brightness around the LCD panel, and calculates a difference value therebetween. The smart mirror further includes a voltage determination unit, which receives the calculated difference value and determines the drive voltage depending on the difference value, and a voltage apply and supply unit which applies the drive voltage, determined by the voltage determination unit, to the LCD panel.
    Type: Grant
    Filed: August 23, 2007
    Date of Patent: November 30, 2010
    Assignee: Sody
    Inventor: Jong Cheon Lee
  • Patent number: 7820250
    Abstract: To provide a liquid crystal optical modulation element which is excellent in durability against blue laser and which can maintain the characteristics for a long period of time. A liquid crystal optical modulation element to modulate a laser beam having a wavelength of at most 500 nm, which comprises a layer of a polymer liquid crystal composition sandwiched between a pair of transparent substrates facing each other, characterized in that each of the pair of transparent substrates has an alignment film on the surface which faces the other transparent substrate, and the polymer liquid crystal composition is a polymer liquid crystal containing a hindered amine compound and a hindered phenol compound.
    Type: Grant
    Filed: April 18, 2008
    Date of Patent: October 26, 2010
    Assignee: Asahi Glass Company, Limited
    Inventors: Kara Yoshida, Yuriko Kaida, Hiromichi Nagayama, Hiroshi Kumai
  • Patent number: 7787063
    Abstract: On one side of a liquid crystal layer, a first electrode is provided, and, on the other side of the liquid crystal layer, a second electrode, composed of a plurality of individual electrodes, and a third electrode are provided. The second and third electrodes have holes that are increasingly small away from the liquid crystal layer. When the potential at the third electrode is set equal to or lower than the potential at the second electrode, the liquid crystal layer acts as a convex lens; when the potential at the third electrode is set higher than the potential at the second electrode, the liquid crystal layer acts as a concave lens. The range in which the focal length can be varied depends on the diameters of the holes, and giving the holes of the different electrodes varying diameters helps widen the range. Moreover, conductors can be laid to reach the electrodes at the outer edges thereof so as not to directly face the liquid crystal layer.
    Type: Grant
    Filed: June 6, 2006
    Date of Patent: August 31, 2010
    Assignee: Konica Minolta Holdings, Inc.
    Inventor: Satoru Hirose
  • Patent number: 7755014
    Abstract: An optical pickup device is equipped with a diffraction element (8) that includes liquid crystal, two transparent electrodes sandwiching the liquid crystal, and a liquid crystal control portion (21) with electrodes connected electrically to the transparent electrode for controlling a voltage to be applied between the two transparent electrodes. The diffraction element (8) is provided with two types of diffraction areas (19) and (20). Each of the diffraction areas (19) and (20) generate predetermined diffracted light only from one of different wavelengths of light beams. The transparent electrodes of the diffraction areas (19) and (20) that are patterned are connected electrically to different electrodes (22c) and (22a), respectively.
    Type: Grant
    Filed: February 6, 2007
    Date of Patent: July 13, 2010
    Assignee: Funai Electric Co., Ltd.
    Inventor: Kenji Nagashima
  • Patent number: 7719657
    Abstract: The present application relates to a liquid crystal lens element and an optical head device, in particular order, to a liquid crystal lens capable of switching the focal length among a plurality of different focal lengths according to switching of applied voltage among a plurality of applied voltages, and an optical head device employing the liquid crystal lens, for writing and/or reading an information to/from an optical recording medium.
    Type: Grant
    Filed: October 30, 2006
    Date of Patent: May 18, 2010
    Assignee: Asahi Glass Company, Limited
    Inventors: Yoshiharu Ooi, Yuzuru Tanabe, Hiromasa Sato, Takuji Nomura, Ryuichiro Shimizu
  • Patent number: 7710535
    Abstract: A liquid crystal lens element having a lens function capable of stably correcting spherical aberration containing a power component corresponding to focus change of incident light according to the magnitude of applied voltage. The liquid crystal lens element comprises a pair of transparent substrates 11 and 12, one (12) of the transparent electrodes is provided with a transparent electrode 15 and a Fresnel lens surface 17, and the other one (11) of the pair of transparent electrodes is provided with a phase correction surface 18 and a transparent electrode 16. Thus, by disposing a Fresnel lens surface 17 and a liquid crystal layer 13 between a pair of transparent electrodes 15 and 16, it becomes possible to change substantial refractive index distribution of the liquid crystal layer 13 according to the magnitude of applied voltage, and to add a positive or negative power to a wavefront transmitted through the liquid crystal layer 13, the Fresnel lens surface 17 and the phase correction surface 18.
    Type: Grant
    Filed: January 9, 2007
    Date of Patent: May 4, 2010
    Assignee: Asahi Glass Company, Limited
    Inventors: Takuji Nomura, Hiroyuki Kojima
  • Patent number: 7710536
    Abstract: A liquid crystal diffraction lens element and an optical head device, which can switch focal lengths of both of outgoing light and returning light by a single element, are provided. The liquid crystal lens element comprises transparent substrates 1a, 1b, a liquid crystal 4 sandwiched between the transparent substrates 1a, 1b, transparent electrodes 2a, 2b, birefringent Fresnel lens members 3a, 3b each having a Fresnel lens shape and made of a birefringent material, and a seal 5, wherein the extraordinary refractive index direction A of the birefringent Fresnel lens member 3a and the extraordinary refractive index direction B of the birefringent Fresnel lens member 3b are perpendicular to each other, and the alignment direction of the liquid crystal 4 at the interface between the liquid crystal 4 and the transparent substrate 1a is perpendicular to the alignment direction of the liquid crystal 4 at the interface between the liquid crystal 4 and the transparent substrate 1b.
    Type: Grant
    Filed: April 19, 2007
    Date of Patent: May 4, 2010
    Assignee: Asahi Glass Company, Limited
    Inventors: Mitsuo Osawa, Yoshiharu Ooi
  • Patent number: 7693389
    Abstract: An electro-optic device includes a pair of substrates, and an electro-optic material held between the pair of substrates, wherein one of the pair of substrates includes a condensing unit provided on the electro-optic material-side surface of the substrate in order to condense light incident on the substrate, and a functional layer provided to overlap at least the condensing unit in a plan view.
    Type: Grant
    Filed: February 7, 2007
    Date of Patent: April 6, 2010
    Assignee: Seiko Epson Corporation
    Inventor: Shunji Kamijima
  • Patent number: 7633671
    Abstract: The use of spatial light modulators to steer light beams is disclosed. A dual frequency liquid crystal spatial light modulator can be controlled so as to form a blazed phase grating thereon that effects desire deflection of incident light.
    Type: Grant
    Filed: September 28, 2007
    Date of Patent: December 15, 2009
    Assignee: The Boeing Company
    Inventors: Jonathan M. Maram, Jeffrey H. Hunt
  • Patent number: 7583423
    Abstract: Transmission and reflection type holograms may be formed utilizing a novel polymer-dispersed liquid crystal (PDLC) material and its unique switching characteristics to form optical elements. Applications for these switchable holograms include communications switches and switchable transmission, and reflection red, green, and blue lenses. The PDLC material offers all of the features of holographic photopolymers with the added advantage that the hologram can be switched on and off with the application of an electric field. The material is a mixture of a polymerizable monomer and liquid crystal, along with other ingredients, including a photoinitiator dye. Upon irradiation, the liquid crystal separates as a distinct phase of nanometer-size droplets aligned in periodic channels forming the hologram. The material is called a holographic polymer-dispersed liquid crystal (H-PDLC).
    Type: Grant
    Filed: November 8, 2005
    Date of Patent: September 1, 2009
    Assignee: Science Applications International Corporation
    Inventors: Richard L. Sutherland, Bill Hagan, William J. Kelly, Bob Epling
  • Patent number: 7492986
    Abstract: An optical switching apparatus includes at least one optical waveguide to deliver at least one input optical beam. A dispersion device spatially separates the at least one input optical beam into individual wavelength channels. An optical power device aligns the individual wavelength channels. An optical switch has at least one transflective polarizing element, at least one birefringent wedge and at least two polarization switches. The individual wavelength channels are directed to independently addressable regions of the polarization switches for wavelength selective switching. A second optical power device aligns the individual wavelength channels from the optical switch. A second dispersion device spatially combines individual wavelength channels from the second optical power device. At least one output optical waveguide receives at least one of the individual wavelength channels from the second dispersion device.
    Type: Grant
    Filed: April 18, 2007
    Date of Patent: February 17, 2009
    Assignee: Coadna Photonics, Inc.
    Inventor: Jack R. Kelly
  • Patent number: 7486350
    Abstract: A display device includes: a main LCD; a SW LCD, disposed on an optical path of light transmitting through the main LCD, for electrically switching a visible image between a single image display mode and a multiple image display mode; a first polarizer; and a second polarizer. The major axis direction of liquid crystal molecules in the liquid crystal layer of the SW LCD is always substantially parallel to the polarization direction of light after transmission through the first polarizer when projected from the normal to the substrates. At least some of the liquid crystal molecules in the liquid crystal layer are controlled in terms of alignment direction so that the major axis direction of the liquid crystal molecules is substantially parallel to the substrates in the single image display mode and tilted from the substrates in the multiple image display mode.
    Type: Grant
    Filed: December 23, 2005
    Date of Patent: February 3, 2009
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Koji Yabuta, Hiroshi Fukushima, Tomoo Takatani
  • Publication number: 20080259435
    Abstract: A beam-steering element made of a more optically-active material, potassium tantalate niobate, with an improved diffraction efficiency, having a plurality of electrode layers and one electro-optic crystal layer interposed between every two adjacent electrode layers. Each electro-optic crystal layer and the electrode layer adjacent thereto have an aspect ratio of about 1:1. The electrode layers and the electro-optic crystal layers are interposed between two substrates. Preferably, the substrates are transparent to an incoming beam to be modulated by the electro-optic crystal layer.
    Type: Application
    Filed: August 6, 2007
    Publication date: October 23, 2008
    Inventors: James M. Cicchiello, Curtis J. Harkrider, Kenneth E. Kreischer, David A. Gallagher
  • Patent number: 7423719
    Abstract: An optical diffusion film comprises a plurality of diffraction grating cells formed on a substrate, each cell comprising a plurality of curved gratings disposed in parallel with each other and containing the same profile. Such film can be manufactured by embossing, using an original plate formed by etching a photosensitive material by means of an electronic beam exposure system to produce gratings. When such a film is provided with a reflection layer and exposed to light coming obliquely from above, highly bright and diffracted light is emitted in a predetermined direction.
    Type: Grant
    Filed: August 31, 2001
    Date of Patent: September 9, 2008
    Assignee: Toppan Printing Co., Ltd.
    Inventor: Susumu Takahashi
  • Patent number: 7420733
    Abstract: A new photopolymerizable material allows single-step, fast recording of volume holograms with properties that can be electrically controlled. Polymer-dispersed liquid crystals (PDLCs) in accordance with the invention preferably comprise a homogeneous mixture of a nematic liquid crystal and a multifunctional pentaacrylate monomer in combination with photoinitiator, coinitiator and cross-linking agent. Optionally, a surfactant such as octancic acid may also be added. The PDLC material is exposed to coherent light to produce an interference pattern inside the material. Photopolymerization of the new PDLC material produces a hologram of clearly separated liquid crystal domains and cured polymer domains.
    Type: Grant
    Filed: February 22, 2007
    Date of Patent: September 2, 2008
    Assignee: Science Applications International Corporation
    Inventors: Lalgudi V. Natarajan, Richard L. Sutherland, Vince P. Tondiglia, Timothy J. Bunning, Bob Epling, Donna M. Brandelik
  • Patent number: 7417706
    Abstract: A beam steering device uses a liquid crystal with an array of back electrodes. Voltages are applied to the array to cause a desired phase distribution across the array, the distribution being selected to steer a beam incident upon the array into a desired direction. Reflective elements are disposed to reflect light incident in the spaces between the electrodes to reduce losses and to smooth the transitions in phase between adjacent electrodes.
    Type: Grant
    Filed: May 22, 2006
    Date of Patent: August 26, 2008
    Assignee: Thomas Swan and Co. Ltd.
    Inventor: Melanie Holmes
  • Patent number: 7400436
    Abstract: The invention relates to a system for shifting at least one light spot (903), said system comprising: —a phase-modulator (906) for generating, from an input light beam, a light beam which is phase-modulated according to a controllable phase profile, —an array of apertures (902) for generating said at least one light spot (903) from said phase-modulated light beam, a change of the phase profile implying a shift of said at least one light spot (903).
    Type: Grant
    Filed: September 2, 2004
    Date of Patent: July 15, 2008
    Assignee: Koninklijke Philips Electronic N.V.
    Inventor: Robert Frans Maria Hendriks