Patents Examined by Amel C. Lavarias
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Patent number: 7876482Abstract: A method for compensating for a wavelength mismatch between a readout reference beam and a recording reference beam in a holographic storage system is described. In order to compensate for a wavelength mismatch in a first step the wavelength mismatch is determined. In a second step the direction of at least part of the readout reference beam is adjusted relative to a holographic storage medium in dependence on the determined wavelength mismatch by defocusing the readout reference beam or by adjusting the focal length of an objective lens for focusing the readout reference beam into the holographic storage medium.Type: GrantFiled: April 10, 2007Date of Patent: January 25, 2011Assignee: Thomson LicensingInventors: Joachim Knittel, Frank Przygodda
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Patent number: 7859751Abstract: A compact apparatus for reading from and/or writing to holographic storage media and polarizing filter for use in such an apparatus includes a substrate with an outer zone and an inner zone, the outer zone and the inner zone having different optical properties for a first direction of polarization and a second direction of polarization, and a wave plate attached to the substrate for influencing the polarization of the a light beam, wherein a part of the wave plate corresponding to either the outer zone or the inner zone is switchable.Type: GrantFiled: September 20, 2007Date of Patent: December 28, 2010Assignee: Thomson LicensingInventor: Joachim Knittel
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Patent number: 7835080Abstract: An antireflective member has an uneven surface pattern, in which unit structures are arranged in x and y directions at respective periods that are both shorter than the shortest wavelength of an incoming light ray, on the surface of a substrate and satisfies the following Inequality (1): ? ? ? x , y ? min < 1 ni + ni · sin ? ? ? ? ? i max ( 1 ) where ?min is the shortest wavelength of the incoming light ray, ?imax is the largest angle of incidence of the incoming light ray, ni is the refractive index of an incidence medium, ?x is the period of the uneven surface pattern in the x direction, and ?y is the period of the pattern in the y direction. As a result, diffraction of short-wave light components can be reduced in a broad wavelength range.Type: GrantFiled: February 6, 2007Date of Patent: November 16, 2010Assignee: Sharp Kabushiki KaishaInventors: Tokio Taguchi, Shun Ueki, Kozo Nakamura, Kazuhiko Tsuda
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Patent number: 7580185Abstract: A microscopy system and method allow observing a fluorescent substance accumulated in a tissue. The tissue can be observed at a same time both with visible light and with fluorescent light. It is possible to observe a series of previously recorded fluorescent light images in superposition with the visible light images. An end of the series of images may be automatically determined. A thermal protective filter may be inserted into a beam path of an illuminating system at such automatically determined end of the series. Further, the fluorescent light image may be analyzed for identifying a coherent fluorescent portion thereof. A representation of a periphery line of the coherent portion may be generated, and depths profile data may be obtained only from the coherent portion. An illuminating light beam for exciting the fluorescence may be modulated for improving a contrast of fluorescent images.Type: GrantFiled: August 28, 2003Date of Patent: August 25, 2009Assignee: Carl Zeiss Surgical GmbHInventors: Michael Haisch, Christoph Hauger, Gerhard Gaida, Andreas Raabe
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Patent number: 7535640Abstract: An optical imaging system for inspection microscopes with which lithography masks can be checked for defects particularly through emulation of high-aperture scanner systems is provided. The imaging system for emulating high-aperture scanner systems includes imaging optics, a detector and an evaluating unit, wherein at least one polarization-active optical element is arranged as desired in the imaging beam path for selection of different polarization components of the imaging beam, an optical element with intensity attenuation function can be introduced in the imaging beam path, images of the mask and/or sample are received by the detector for differently polarized beam components and are conveyed to the evaluating unit for further processing.Type: GrantFiled: August 20, 2004Date of Patent: May 19, 2009Assignee: Carl Zeiss SMS GmbHInventors: Michael Totzeck, Ulrich Stroessner, Joern Greif-Wuestenbecker
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Patent number: 7495831Abstract: An optical element, an optical device, and a display device are disclosed that are able to change a polarization state in time order and to produce polarized light with little wavelength dependence and superior in polarization purity, and able to perform pixel shift easily and accurately to realize high resolution image display. The optical element has a translucent surface parallel to the rotational axis of the optical element, and at least a portion of the translucent surface is formed from an optically anisotropic medium. A polarization state of a light beam transmitting through the translucent surface is switched in time order along with rotation of the optical element.Type: GrantFiled: August 18, 2005Date of Patent: February 24, 2009Assignee: Ricoh Company, Ltd.Inventors: Toshiaki Tokita, Kazuhiro Fujita, Toshiharu Murai, Atsushi Takaura, Kazuya Miyagaki, Takanobu Osaka, Yasuyuki Takiguchi, Hiroyuki Sugimoto, Yumi Matsuki, Yukiko Hirano
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Patent number: 7375889Abstract: A method for resetting a polarization controller includes determining that the phase magnitude is associated with a first range of phase angles and generating a first control signal having a first characteristic if the phase magnitude is increasing, and generating the first control signal having a second characteristic if the phase magnitude is decreasing. The phase magnitude associated with a second range of phase angles is determined. The first control signal having the second characteristic is generated if the phase magnitude is increasing. The first control signal having the first characteristic is generated if the phase magnitude is decreasing.Type: GrantFiled: February 23, 2006Date of Patent: May 20, 2008Assignee: Coadna Photonics, Inc.Inventors: Jack Robert Kelly, Xuewu Liu
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Patent number: 7173763Abstract: An optical interleaver for use in a range of telecommunications applications including optical multiplexers/demultiplexers and optical routers. The optical device includes an optical processing loop which allows multi-stage performance characteristics to be achieved with a single physical filtration stage. Optical processing on the first leg and second legs of the loop is asymmetrical thereby improving the integrity of the optical signals by effecting complementary chromatic dispersion on the first and second legs. A fundamental filter cell within the interleaver filters optical signals propagating on each of the two legs of the optical loop which intersects the fundamental filter cell.Type: GrantFiled: June 11, 2004Date of Patent: February 6, 2007Assignee: Finisar CorporationInventors: Tengda Du, Kevin Dapeng Zhang, Xin Luo
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Patent number: 7139125Abstract: A light redirecting article redirects light toward a target angle. The light redirecting article has an input surface for accepting incident illumination over a range of incident angles and an output surface with a plurality of light redirecting structures, each light redirecting structure having an internal reflection surface oriented at a first angle with respect to the plane of the input surface and an exit surface for emitting an output light at an emitted light angle, wherein the exit surface is oriented at a second angle relative the plane of the input surface. For incident illumination at a principal angle greater than 60 degrees from normal, light is reflected from the internal reflection surface and emitted from the exit surface at an emitted light angle that is within 5 degrees of the target angle.Type: GrantFiled: December 13, 2005Date of Patent: November 21, 2006Assignee: Eastman Kodak CompanyInventor: Xiang-Dong Mi
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Patent number: 6829424Abstract: The invention relates to a cable closure for optical-fiber cables, preferably optical-fiber minicables or optical-fiber microcables, with cable lead-in units, which are arranged perpendicularly with respect to the axis of the closure body, and it is possible for the closure to be fitted vertically into a core hole made into the earth or into road surfacings. On account of laid-in excess lengths of optical waveguide, splice organizers in the interior of the closure body can be taken out upwards for service work. Preferably, the excess lengths of optical waveguide are carried in a protective tube, which is deposited in a plurality of loops in the interior of the closure.Type: GrantFiled: July 17, 1998Date of Patent: December 7, 2004Assignee: CCS Technology, Inc.Inventors: Lothar Finzel, Günter Schröder, Heinz Diermeier
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Patent number: 6456685Abstract: An apparatus and method for cleaving optical waveguides to precise differential length are described. A first end of a waveguide is coupled to an input port of a reflectometer. A reference mirror is then positioned in a path of radiation propagating through the second end of the waveguide. A waveguide cutting tool is then positioned proximate to the waveguide and at a distance relative to a reference mirror. A first reflectometry measurement is performed on the waveguide to a second end of the waveguide. A second reflectometry measurement is performed on the waveguide to the reference mirror. The waveguide is then positioned relative to the reference mirror and waveguide cutting tool so that the first reflectometery measurement is a measurement increment apart from the second reflectometry measurement. The waveguide is then cut with the cutting tool positioned at the distance relative to the reference mirror.Type: GrantFiled: June 29, 2000Date of Patent: September 24, 2002Assignee: AXE, Inc.Inventor: Michael J. LaGasse