Patents by Inventor Hisato Uetsuka
Hisato Uetsuka has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11635501Abstract: In the prior art, a scanning element used for Lidar in the self-driving car technology employed a mirror or the like continuously rotated by MEMS, and due to the inertia of the mirror or the like, the scanning element was suited for a raster scan that scans a scene in one stroke, but was incapable of discontinuous movement from one arbitrary point to another, and programmable scanning with an arbitrary frequency in an arbitrary pattern, as fast as the raster scan.Type: GrantFiled: September 28, 2018Date of Patent: April 25, 2023Assignee: NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGYInventor: Hisato Uetsuka
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Publication number: 20220404498Abstract: To provide a distance and velocity measurement apparatus that can be adopted preferably in a LiDAR or a sensor for a robot, wherein the apparatus can prevent deterioration of SN ratio even in a case where an object in an external environment vibrates. A LiDAR 20 according to the present embodiment includes a first laser apparatus 1a, a second laser apparatus 1b, a polarization-maintaining type optical fiber 2, a WDM filter 6, an optical fiber coupler 3a, an optical amplifier 11, an input/output unit 4, an optical scanner 5, a second optical fiber coupler 3b, a balanced photodetector 7, and a square-law detector 9. Further, a delay line 10 composed of a polarization-maintaining optical fiber is provided on the local port 2b.Type: ApplicationFiled: July 21, 2020Publication date: December 22, 2022Inventor: Hisato UETSUKA
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Patent number: 11327381Abstract: [Problem] Conventional multi-stage optical switching elements have had the problems that, when the number of polarized light beams becomes large, walkoff of light beams produced in middle stages is gradually amplified so that beams at the terminal end deviate from the opening surface and the configuration of the optical switching element itself becomes larger.Type: GrantFiled: March 25, 2019Date of Patent: May 10, 2022Assignee: NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGYInventor: Hisato Uetsuka
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Publication number: 20220091456Abstract: [Problem] Conventional multi-stage optical switching elements have had the problems that, when the number of polarized light beams becomes large, walkoff of light beams produced in middle stages is gradually amplified so that beams at the terminal end deviate from the opening surface and the configuration of the optical switching element itself becomes larger.Type: ApplicationFiled: March 25, 2019Publication date: March 24, 2022Inventor: Hisato UETSUKA
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Patent number: 11099446Abstract: When polymer-stabilized blue-phase liquid crystal is driven by comb-shaped electrodes, a large electric field is generated near the electrodes, and electrostriction results in degradations in the switching speed of polymer-stabilized blue-phase liquid crystal. This optical switching engine is manufactured by inserting polymer-stabilized blue-phase liquid crystal between parallel plates on which are formed conventional thin film electrodes, followed by bonding a polarization grating plate thereto, and disposing or bonding two silicon wedges having triangular cross sections to the sides thereof so as to have rotational symmetry with each other.Type: GrantFiled: June 27, 2018Date of Patent: August 24, 2021Assignee: NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGYInventor: Hisato Uetsuka
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Patent number: 10989981Abstract: With the conventional optical deflection elements using polarization gratings (PGs), it has been difficult to independently switch multiple optical beams at one time in a variety of angular ranges and angular steps at high speed on the ?-second time scale, and it has been impossible to achieve a highly reliable optical deflection element module capable of operating at different ambient temperatures. Provided is an optical deflection element including: a polarization grating plate having a rectangular or circular segment structure, in which the cycles ? of PGs are not uniform within the plate plane and the cycle and/or the rotational direction of a birefringence axis varies; and a phase panel having a segment structure that is accordingly segmented within the same plane are bonded together, wherein their corresponding segments overlap with each other, and optical switches of the polarization gratings are controlled by a voltage change in the phase panel.Type: GrantFiled: December 7, 2017Date of Patent: April 27, 2021Assignee: National Institute of Advanced Industrial Science and TechnologyInventors: Hisato Uetsuka, Masahiro Ookawa, Bing Yao
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Publication number: 20200300992Abstract: In the prior art, a scanning element used for Lidar in the self-driving car technology employed a mirror or the like continuously rotated by MEMS, and due to the inertia of the mirror or the like, the scanning element was suited for a raster scan that scans a scene in one stroke, but was incapable of discontinuous movement from one arbitrary point to another, and programmable scanning with an arbitrary frequency in an arbitrary pattern, as fast as the raster scan.Type: ApplicationFiled: September 28, 2018Publication date: September 24, 2020Inventor: Hisato UETSUKA
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Publication number: 20200225514Abstract: When polymer-stabilized blue-phase liquid crystal is driven by comb-shaped electrodes, a large electric field is generated near the electrodes, and electrostriction results in degradations in the switching speed of polymer-stabilized blue-phase liquid crystal. This optical switching engine is manufactured by inserting polymer-stabilized blue-phase liquid crystal between parallel plates on which are formed conventional thin film electrodes, followed by bonding a polarization grating plate thereto, and disposing or bonding two silicon wedges having triangular cross sections to the sides thereof so as to have rotational symmetry with each other.Type: ApplicationFiled: June 27, 2018Publication date: July 16, 2020Inventor: Hisato UETSUKA
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Publication number: 20200209705Abstract: With the conventional optical deflection elements using polarization gratings (PGs), it has been difficult to independently switch multiple optical beams at one time in a variety of angular ranges and angular steps at high speed on the ?-second time scale, and it has been impossible to achieve a highly reliable optical deflection element module capable of operating at different ambient temperatures. Provided is an optical deflection element including: a polarization grating plate having a rectangular or circular segment structure, in which the cycles A of PGs are not uniform within the plate plane and the cycle and/or the rotational direction of a birefringence axis varies; and a phase panel having a segment structure that is accordingly segmented within the same plane are bonded together, wherein their corresponding segments overlap with each other, and optical switches of the polarization gratings are controlled by a voltage change in the phase panel.Type: ApplicationFiled: December 7, 2017Publication date: July 2, 2020Inventors: Hisato Uetsuka, Masahiro Ookawa, Bing Yao
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Patent number: 10613412Abstract: A conventional optical switching engine has difficulty in producing a universal multiport switching engine being capable of (i) programmatically changing regions to be switched, (ii) generating no wavelength dependent loss, (iii) having a small Walk-off, and (iv) being usable for small to large light beams. Produced is a light beam deflecting element in which a polarization grating is fitted in parallel on an N×M transmissive birefringence modulator formed such that a transmissive variable half-wavelength liquid crystal plate is divided into rectangular extreme small pixels, and many N and M pixels thus obtained are respectively arranged in X and Y axes directions in a matrix form, the polarization grating being a grating in which a period ? changes in an X? axis direction (direction to which a birefringence axis rotates) in accordance with a wavelength width of light.Type: GrantFiled: April 18, 2016Date of Patent: April 7, 2020Assignee: NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCEInventors: Hisato Uetsuka, Shu Namiki, Hitoshi Kawashima, Kazuhiro Ikeda
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Publication number: 20180143508Abstract: A conventional optical switching engine has difficulty in producing a universal multiport switching engine being capable of (i) programmatically changing regions to be switched, (ii) generating no wavelength dependent loss, (iii) having a small Walk-off, and (iv) being usable for small to large light beams. Produced is a light beam deflecting element in which a polarization grating is fitted in parallel on an N×M transmissive birefringence modulator formed such that a transmissive variable half-wavelength liquid crystal plate is divided into rectangular extreme small pixels, and many N and M pixels thus obtained are respectively arranged in X and Y axes directions in a matrix form, the polarization grating being a grating in which a period ? changes in an X? axis direction (direction to which a birefringence axis rotates) in accordance with a wavelength width of light.Type: ApplicationFiled: April 18, 2016Publication date: May 24, 2018Inventors: Hisato Uetsuka, Shu Namiki, Hitoshi Kawashima, Kazuhiro Ikeda
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Publication number: 20130272650Abstract: A wavelength cross connect device includes an input demultiplexing optical system for demultiplexing light input from a plurality of input ports into respective wavelengths, a wavelength switching optical system for switching and outputting the lights of respective wavelengths input from the input demultiplexing optical system to respective desired ports, and an output multiplexing optical system for multiplexing the lights of respective wavelengths input from the wavelength switching optical system per port. The input demultiplexing optical system and the output multiplexing optical system includes a lens system that has a function of focusing lights independently in vertical and widthwise directions.Type: ApplicationFiled: March 25, 2013Publication date: October 17, 2013Applicants: National Institute of Advanced Industrial Science and Technology, KEIO UNIVERSITY, HITACHI CABLE, LTD.Inventors: Hiroshi Ishikawa, Toshifumi Hasama, Hitoshi Kawashima, Masahiko Mori, Hisato Uetsuka, Akihito Hongo, Hiroyuki Tsuda, Keisuke Sorimoto, Nazirul Afham bin Idris
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Patent number: 8503836Abstract: To provide a waveguide type wavelength domain optical switch which makes it possible to use a cheap lens, makes it possible to correct aberration of the demultiplexed wavelengths produced in a plurality of waveguide type demultiplexing circuits, a wavelength domain optical switch is provided with: an integrated element formed by laminating three or more waveguide type demultiplexing circuits; a first lens for collecting light emitted from the integrated element; a polarization separation element for separating light emitted from the first lens into X polarization and Y polarization and emitting the X polarization and the Y polarization at different angles; a second lens for collecting the X polarization and the Y polarization; a first reflective optical phase modulator for reflecting the collected X polarization and Y polarization at any angles; a ½-wavelength plate disposed between the second lens and the first reflective optical phase modulator in order to make polarization directions of the X polarizationType: GrantFiled: January 26, 2011Date of Patent: August 6, 2013Assignees: National Institute of Advanced Industrial Science and Technology, Hitachi Cable, Ltd, Keio UniversityInventors: Hiroshi Ishikawa, Toshifumi Hasama, Hitoshi Kawashima, Kenji Kintaka, Masahiko Mori, Hisato Uetsuka, Hiroyuki Tsuda, Keisuke Sorimoto
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Patent number: 8229258Abstract: An optical waveguide-type wavelength domain switch includes a waveguide-type multi/demultiplexing device laminate comprising three or more laminated waveguide-type multi/demultiplexing devices, a lens system positioned on a demultiplex side of the waveguide-type multi/demultiplexing device laminate, and a reflective optical phase-modulating cell positioned on an opposite side of the waveguide-type multi/demultiplexing device laminate to the lens system.Type: GrantFiled: September 16, 2009Date of Patent: July 24, 2012Assignees: National Institute of Advanced Industrial Science and Technology, Hitachi Cable, Ltd., Keio UniversityInventors: Hiroshi Ishikawa, Toshifumi Hasama, Hitoshi Kawashima, Kenji Kintaka, Masahiko Mori, Hisato Uetsuka, Hiroyuki Tsuda, Keisuke Sorimoto
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Publication number: 20110182545Abstract: To provide a waveguide type wavelength domain optical switch which makes it possible to use a cheap lens, makes it possible to correct aberration of the demultiplexed wavelengths produced in a plurality of waveguide type demultiplexing circuits, a wavelength domain optical switch is provided with: an integrated element formed by laminating three or more waveguide type demultiplexing circuits; a first lens for collecting light emitted from the integrated element; a polarization separation element for separating light emitted from the first lens into X polarization and Y polarization and emitting the X polarization and the Y polarization at different angles; a second lens for collecting the X polarization and the Y polarization; a first reflective optical phase modulator for reflecting the collected X polarization and Y polarization at any angles; a ½-wavelength plate disposed between the second lens and the first reflective optical phase modulator in order to make polarization directions of the X polarizationType: ApplicationFiled: January 26, 2011Publication date: July 28, 2011Applicants: National Institute of Advanced Industrial Science and Technology, Hitachi Cable, Ltd., Keio UniversityInventors: Hiroshi Ishikawa, Toshifumi Hasama, Hitoshi Kawashima, Kenji Kintaka, Masahiko Mori, Hisato Uetsuka, Hiroyuki Tsuda, Keisuke Sorimoto
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Publication number: 20100067900Abstract: An optical waveguide-type wavelength domain switch includes a waveguide-type multi/demultiplexing device laminate comprising three or more laminated waveguide-type multi/demultiplexing devices, a lens system positioned on a demultiplex side of the waveguide-type multi/demultiplexing device laminate, and a reflective optical phase-modulating cell positioned on an opposite side of the waveguide-type multi/demultiplexing device laminate to the lens system.Type: ApplicationFiled: September 16, 2009Publication date: March 18, 2010Applicants: National Institute of Advanced Industrial Science and Technology, HITACHI CABLE, LTD., KEIO UNIVERSITYInventors: Hiroshi Ishikawa, Toshifumi Hasama, Hitoshi Kawashima, Kenji Kintaka, Masahiko Mori, Hisato Uetsuka, Hiroyuki Tsuda, Keisuke Sorimoto
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Patent number: 7567736Abstract: A waveguide type wavelength domain optical switch includes an input/output port including at least three waveguide spectrometers stacked in thickness direction, a first lens for collecting light outputted from an input port of the input/output port in one axis direction, a second lens for collecting light outputted from the first lens in a direction orthogonal to the collecting direction of the first lens, and an optical phase modulation cell for reflecting light outputted from the second lens through the second lens and the first lens to an output port of the input/output port. Alternatively, the input/output port may include at least two waveguide spectrometers and a waveguide optical coupler circuit stacked in thickness direction.Type: GrantFiled: May 28, 2008Date of Patent: July 28, 2009Assignees: National Institute of Advanced Industrial Science and Technology, Hitachi Cable, Ltd.Inventors: Hiroshi Ishikawa, Toshifumi Hasama, Masahiko Mori, Hisato Uetsuka
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Patent number: 7496256Abstract: A diffraction grating of the present invention includes a first block (101) and a second block (102). The first block (101) is made up of a plurality of input waveguides (103), a slab waveguide (104), a delay waveguide array (105) and narrow grooves (106): each of which being filled with resin. The second block (102) is made up of a plurality of input waveguides (107), a slab waveguide (108) and a plurality of output waveguides (109). Since a circuit is cut off at the ends of the arrayed waveguides, a relative phase can easily be measured. The resin has undergone a refractive-index adjustment and compensates a phase error.Type: GrantFiled: August 2, 2007Date of Patent: February 24, 2009Assignees: KEIO University, Hitachi Cable, Ltd.Inventors: Hiroyuki Tsuda, Hiroshi Ishikawa, Hisato Uetsuka
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Publication number: 20080298738Abstract: A waveguide type wavelength domain optical switch includes an input/output port including at least three waveguide spectrometers stacked in thickness direction, a first lens for collecting light outputted from an input port of the input/output port in one axis direction, a second lens for collecting light outputted from the first lens in a direction orthogonal to the collecting direction of the first lens, and an optical phase modulation cell for reflecting light outputted from the second lens through the second lens and the first lens to an output port of the input/output port.Type: ApplicationFiled: May 28, 2008Publication date: December 4, 2008Applicants: National Institute of Advanced Industrial Science and Technology, HITACHI CABLE, LTD.Inventors: Hiroshi Ishikawa, Toshifumi Hasama, Masahiko Mori, Hisato Uetsuka
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Publication number: 20080056643Abstract: A diffraction grating of the present invention includes a first block (101) and a second block (102). The first block (101) is made up of a plurality of input waveguides (103), a slab waveguide (104), a delay waveguide array (105) and narrow grooves (106): each of which being filled with resin. The second block (102) is made up of a plurality of input waveguides (107), a slab waveguide (108) and a plurality of output waveguides (109). Since a circuit is cut off at the ends of the arrayed waveguides, a relative phase can easily be measured. The resin has undergone a refractive-index adjustment and compensates a phase error.Type: ApplicationFiled: August 2, 2007Publication date: March 6, 2008Applicants: KEIO University, Hitachi Cable, Ltd.Inventors: Hiroyuki Tsuda, Hiroshi Ishikawa, Hisato Uetsuka