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1.发明授权公开(公告)号：US11635501B2
公开(公告)日：2023-04-25
申请号：US16650440
申请日：2018-09-28
Inventor： Hisato Uetsuka
Abstract: 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. In the present invention, there was fabricated Lidar, which is composed of a polarization diversity scheme and a scanning element, wherein the polarization diversity scheme uses two polarization gratings, each polarization grating having a thickness such that it becomes a half-wave plate, wherein birefringent directors of each polarization grating rotate with a period Λ, wherein these polarization gratings are disposed with a desired interval from each other, wherein a half-wave plate is inserted in either one of two paths of separated, exiting right-handed or left-handed circularly polarized light beam, depending on a rotation direction of the circularly polarized light, to thereby enable conversion of light beams into parallel proximate circularly polarized light beams with the same rotational direction, and wherein the scanning element has a multistage structure of polarization switch-polarization grating sets connected in combination, with a polarization switch and a polarization grating being defined as one set.
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Patent Agency Ranking
公开(公告)号：US10989981B2
公开(公告)日：2021-04-27
申请号：US16468644
申请日：2017-12-07
Inventor： Hisato Uetsuka , Masahiro Ookawa , Bing Yao
IPC: G02F1/29
Abstract: 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 μ-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 Λ 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.
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公开(公告)号：US11099446B2
公开(公告)日：2021-08-24
申请号：US16627198
申请日：2018-06-27
Inventor： Hisato Uetsuka
IPC: G02F1/137 , G02F1/1335 , G02F1/1333
Abstract: 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.
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公开(公告)号：US20130272650A1
公开(公告)日：2013-10-17
申请号：US13850189
申请日：2013-03-25
Applicant: National Institute of Advanced Industrial Science and Technology , HITACHI CABLE, LTD. , KEIO UNIVERSITY
Inventor： Hiroshi Ishikawa , Toshifumi Hasama , Hitoshi Kawashima , Masahiko Mori , Hisato Uetsuka , Akihito Hongo , Hiroyuki Tsuda , Keisuke Sorimoto , Nazirul Afham bin Idris
IPC: G02B6/35
CPC classification number: G02B6/35 , G02B6/29311 , G02B6/3512 , G02B6/356 , H04Q11/0005 , H04Q2011/0016 , H04Q2011/0026 , H04Q2011/003
Abstract: 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. The wavelength switching optical system includes two light deflector arrays for outputting incoming light of each wavelength after adjusting a horizontal reflection angle of the light, and a switching lens including a lens that has a focal length equal to the Rayleigh length and acts only in a widthwise direction.
Abstract translation: 波长交叉连接装置包括：输入解复用光学系统，用于将从多个输入端口输入的光分解成各波长;波长切换光学系统，用于切换并输出从输入解复用光学系统输入到各个期望端口的各种波长的光 以及用于对每个端口的波长切换光学系统输入的各波长的光进行多路复用的输出复用光学系统。 输入解复用光学系统和输出多路复用光学系统包括具有在垂直方向和宽度方向上独立聚焦的功能的透镜系统。 波长切换光学系统包括两个光偏转器阵列，用于在调整光的水平反射角度之后输出每个波长的入射光，以及包括具有等于瑞利长度的焦距的透镜的切换透镜，并且仅在宽度方向 方向。
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公开(公告)号：US11327381B2
公开(公告)日：2022-05-10
申请号：US17425239
申请日：2019-03-25
Inventor： Hisato Uetsuka
IPC: G02F1/137 , G02F1/13363 , G02F1/1335
Abstract: [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. [Solution] Developed is a 1×N light beam switching element, which has a cube-type modular structure comprising a corner cube and a cubical cube with roughly identical dimensions, which is one-dimensional, two-dimensional, and three-dimensional, and which is fast, highly efficient, wide-angled, and compact, by combining: a simple corner-cube reflection-type light beam switching element comprising a polymer-stabilized blue-phase liquid crystal layer sandwiched between two transparent electrodes in the form of parallel plates, a mirror, and a wedge-shaped prism; and a walkoff correction element in which a condensing-type polarization grating is arranged or affixed to a cubical.
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公开(公告)号：US20200209705A1
公开(公告)日：2020-07-02
申请号：US16468644
申请日：2017-12-07
Inventor： Hisato Uetsuka , Masahiro Ookawa , Bing Yao
IPC: G02F1/29
Abstract: 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 μ-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.
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