Patents by Inventor Keisuke Kojima
Keisuke Kojima 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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Publication number: 20240242489Abstract: The present invention provides an image processing apparatus (10) including: an image processing unit (12) that performs, on an image, extraction processing of extracting a feature value, and estimation processing of estimating a cluster to which each pixel belongs; and a similarity degree computation unit (13) that computes a similarity degree for feature values between pixels estimated to belong to a same cluster, and thereby computes a similarity degree between two images.Type: ApplicationFiled: June 17, 2021Publication date: July 18, 2024Applicant: NEC CorporationInventors: Kazufumi KOJIMA, Masahiro TANI, Keisuke IKEDA
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Publication number: 20230408652Abstract: A light emission device includes: a laser light source; an electric storage element for supplying a drive current to the laser light source; a plurality of switch elements connected in series to the laser light source; and an electrical element placed at least between a ground and an input part, for a switch opening/closing signal, of the switch element to which another one of the switch elements is connected on a downstream side, and configured to guide noise having a high level exceeding a voltage level of the switch opening/closing signal, to the ground.Type: ApplicationFiled: September 1, 2023Publication date: December 21, 2023Inventors: Hirotaka Ueno, Kiyoshi Morimoto, Keisuke Kojima
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Patent number: 11832397Abstract: A printed wiring board includes a resin insulating layer, via conductors formed in the resin insulating layer, metal posts formed on the via conductors, respectively, and a solder resist layer formed on the resin insulating layer such that the metal posts have lower portions embedded in the solder resist layer and upper portions exposed from the solder resist layer, respectively. The metal posts are formed such that each of the metal posts has a top portion having a diameter in a range of 0.8 to 0.9 times a diameter of a respective one of the lower portions of the metal posts.Type: GrantFiled: November 27, 2020Date of Patent: November 28, 2023Assignee: IBIDEN CO., LTD.Inventors: Masashi Awazu, Keisuke Kojima
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Publication number: 20230367997Abstract: A reconfigurable device is provided for splitting optical beams. The device includes an input port configured to receive an input beam including at least two primary wavelengths, a tunable splitter configured to separate the input beam into at least two beams via at least two routes corresponding to the at least two primary wavelengths, wherein each of the at least two routes is configured to propagate one of the at least two primary wavelengths of the input beam, wherein the tunable splitter includes a bottom electrode, a substrate on the bottom electrode, core segments arranged on the substrate, a top layer, support segments to connect the substrate and the top layer, a top electrode on the top layer, a controllable refractive index layer arranged to fill gaps between the substrate, the support segments, and the top layer; and at least two output ports configured to transmit the at least two beams propagated via the at least two routes.Type: ApplicationFiled: November 14, 2022Publication date: November 16, 2023Inventors: Keisuke Kojima, Minwoo Jung, Toshiaki Koike Akino, Ye Wang, Matthew Brand
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Publication number: 20230367035Abstract: A computer-implemented method is provided for designing a metalens. The metalens has a metasurface including nano-structures arranged on a substrate based on preliminary simulation data.Type: ApplicationFiled: May 11, 2022Publication date: November 16, 2023Inventors: Matthew Brand, Dayu Zhu, Keisuke Kojima
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Patent number: 11650371Abstract: A grating coupler having first and second ends for coupling a light beam to a waveguide of a chip includes a substrate configured to receive the light beam from the first end and transmit the light beam through the second end, the substrate having a first refractive index n1, a grating structure having curved grating lines arranged on the substrate, the grating structure having a second refractive index n1, wherein the curved grating lines have line width w and height d and are arranged by a pitch ?, wherein the second refractive index n2 is less than first refractive index n1, and a cladding layer configured to cover the grating structure, wherein the cladding layer has a third refractive index n3. The curves of the grating lines are constructed such that the emitting beam is shaped for efficient coupling to another optical component. The curves can also be tilted to reduce coupling back into the waveguide.Type: GrantFiled: February 23, 2021Date of Patent: May 16, 2023Assignee: MITSUBISHI ELECTRIC RESEARCH LABORATORIES INC.Inventors: Keisuke Kojima, Satoshi Nishikawa, Shusaku Hayashi, Yosuke Suzuki, Jonathan Klamkin, Yingheng Tang
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Publication number: 20230092267Abstract: A method for producing a nitrile rubber, includes recovering a nitrile rubber from a latex of nitrile rubber by continuously feeding the latex of nitrile rubber and a coagulant into an extruder including a screw disposed inside a barrel to be rotatably driven, wherein the latex of nitrile rubber fed into the extruder contains 0.1 to 3 parts by weight of a hindered phenol-based antiaging agent having a molecular weight of 300 to 3000 relative to 100 parts by weight of the nitrile rubber.Type: ApplicationFiled: February 4, 2021Publication date: March 23, 2023Applicant: ZEON CORPORATIONInventor: Keisuke KOJIMA
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Publication number: 20220358368Abstract: A photonic device for splitting optical beams includes an input port configured to receive an input beam having an input power, a power splitter including perturbation segments arranged in a first region and a second region of a guide material having a first refractive index, each segment having a second refractive index, wherein the first region is configured to split the input beam into a first beam and a second beam, wherein and the second region is configured to separately guide the first and second beams, wherein the first refractive index is greater than the second refractive index, and output ports including first and second output ports connected the power splitter to respectively receive and transmit the first and second beams.Type: ApplicationFiled: May 3, 2021Publication date: November 10, 2022Applicant: Mitsubishi Electric Research Laboratories, Inc.Inventors: Keisuke Kojima, Toshiaki Koike Akino, Yingheng Tang, Ye Wang
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Patent number: 11251896Abstract: A system is provided for training a device design network. The system includes an interface configured to input data of a device, a memory to store the device design network including an encoder, a decoder, and an adversarial block, and a processor. The processor is, in connection with the memory, configured to update the encoder and the decoder based on a first loss function to reduce the difference between the input data and output data of the decoder, wherein the encoder is constructed by at least one convolutional layer followed by at least one parallel fully connected layer to extract features of a layout of the device, and update the adversarial block to construct by maximizing a second loss function.Type: GrantFiled: March 3, 2020Date of Patent: February 15, 2022Assignee: Mitsubishi Electric Research Laboratories, Inc.Inventors: Keisuke Kojima, Yingheng Tang, Toshiaki Koike-Akino, Ye Wang
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Publication number: 20220012926Abstract: A method for a target image reconstruction is provided. The method includes emitting stepped frequency waveforms having different constant frequencies at different periods of time, modulating the stepped frequency waveforms into frequency ranges each having a first frequency and a second frequency, wherein each of the stepped frequency waveforms are increased from the first frequency to the second frequency based on a range function, wherein the modulated stepped frequency waveforms are arranged with some sparsity factor.Type: ApplicationFiled: July 10, 2020Publication date: January 13, 2022Inventors: David Millar, Okan Atalar, Keisuke Kojima, Toshiaki Koike-Akino, Pu Wang, Kieran Parsons
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Patent number: 11221044Abstract: A rolling bearing includes: an inner ring; an outer ring; a plurality of rolling elements provided between an inner ring raceway and an outer ring raceway; and a cage that holds the rolling elements at intervals in a circumferential direction. The cage includes an annular portion provided in a first axial direction with respect to the rolling elements, and a plurality of cage bars provided to extend in a second axial direction from the annular portion. The annular portion includes a contact surface that makes sliding contact with a shoulder portion. The cage bars each include a first projecting portion and a second projecting portion. The second projecting portion covers a part of the inner ring raceway on a side of the shoulder portion.Type: GrantFiled: September 30, 2020Date of Patent: January 11, 2022Assignee: JTEKT CORPORATIONInventors: Keisuke Kojima, Katsuyuki Harada, Naoki Masuda, Hironori Hiraoka
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Patent number: 11204467Abstract: A grating coupler having first and second ends for coupling a light beam to a waveguide of a chip includes a substrate configured to receive the light beam from the first end and transmit the light beam through the second end, the substrate having a first refractive index n1, a grating structure having curved grating lines arranged on the substrate, the grating structure having a second refractive index n1, wherein the curved grating lines have line width w and height d and are arranged by a pitch ?, wherein the second refractive index n2 is less than first refractive index n1, and a cladding layer configured to cover the grating structure, wherein the cladding layer has a third refractive index n3.Type: GrantFiled: February 28, 2020Date of Patent: December 21, 2021Assignees: Mitsubishi Electric Research Laboratories, Inc., Mitsubishi Electric CorporationInventors: Keisuke Kojima, Mitsunobu Gotoda, Toshiaki Koike-Akino, Mohammad Tahersima
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Patent number: 11181149Abstract: A rolling bearing includes an inner ring, an outer ring, a plurality of balls, and a cage that holds the balls. The cage includes an annular portion and a plurality of cage bars. Each of the balls is received a pocket between each pair of cage bars that is adjacent in the circumferential direction. A portion of the pocket in a second axial direction opens with a dimension that is smaller than a diameter of the balls. The cage bar includes a flat surface that is continuous with an inner peripheral surface of the annular portion, and an inclined surface that extends away from the inner ring toward the second axial direction from the flat surface.Type: GrantFiled: October 7, 2020Date of Patent: November 23, 2021Assignee: Jtekt CorporationInventors: Keisuke Kojima, Katsuyuki Harada, Naoki Masuda, Hironori Hiraoka
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Patent number: 11143821Abstract: An integrated grating coupler system includes a first chip having a first substrate, a first grating structure formed by first grating curves arranged on the first substrate and a cladding layer formed to cover the first grating structure, wherein the first chip include a first waveguide configured to receive a light beam from a first end via the first waveguide and transmit the light beam through a second end, a second chip having a second substrate and a second grating structure formed by second grating curves arranged on the second substrate, wherein the second chip is configured to receive the light beam from the second end of the first chip and transmit the light beam from an end of the second chip, and a common block configured to mount the first chip and second chip via a first submount and a second submount respectively, wherein the first and second submounts are arranged such that the light beam from the second end of the first chip is received at a top of the second chip.Type: GrantFiled: March 24, 2020Date of Patent: October 12, 2021Assignees: Mitsubishi Electric Research Laboratories, Inc., Mitsubishi Electric CorporationInventors: Keisuke Kojima, Satoshi Nishikawa, Jonathan Klamkin
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Publication number: 20210281349Abstract: A photonic device for splitting optical beams includes an input port configured to receive an input beam having an input power, a power splitter including perturbation segments arranged in a first region and a second region of a guide material having a first refractive index, each segment having a second refractive index, wherein the first region is configured to split the input beam into a first beam and a second beam, wherein and the second region is configured to separately guide the first and second beams, wherein the first refractive index is greater than the second refractive index, and output ports including first and second output ports connected the power splitter to respectively receive and transmit the first and second beams.Type: ApplicationFiled: March 3, 2020Publication date: September 9, 2021Applicant: Mitsubishi Electric Research Laboratories, Inc.Inventors: Keisuke Kojima, Yingheng Tang, Toshiaki Koike-Akino, Ye Wang
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Patent number: 11079550Abstract: A grating coupler having first and second ends for coupling a light beam to a waveguide of a chip includes a substrate configured to receive the light beam from the first end and transmit the light beam through the second end, the substrate having a first refractive index n1, a grating structure having curved grating lines arranged on the substrate, the grating structure having a second refractive index n1, wherein the curved grating lines have line width w and height d and are arranged by a pitch ?, wherein the second refractive index n2 is less than first refractive index n1, and a cladding layer configured to cover the grating structure, wherein the cladding layer has a third refractive index n3. The curves of the grating lines are constructed such that the emitting beam is shaped for efficient coupling to another optical component. The curves can also be tilted to reduce coupling back into the waveguide.Type: GrantFiled: January 28, 2020Date of Patent: August 3, 2021Assignee: Mitsubishi Electric Research Laboratories, Inc.Inventors: Keisuke Kojima, Satoshi Nishikawa, Shusaku Hayashi, Yosuke Suzuki, Jonathan Klamkin, Yingheng Tang
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Publication number: 20210181427Abstract: A grating coupler having first and second ends for coupling a light beam to a waveguide of a chip includes a substrate configured to receive the light beam from the first end and transmit the light beam through the second end, the substrate having a first refractive index n1, a grating structure having curved grating lines arranged on the substrate, the grating structure having a second refractive index n1, wherein the curved grating lines have line width w and height d and are arranged by a pitch ?, wherein the second refractive index n2 is less than first refractive index n1, and a cladding layer configured to cover the grating structure, wherein the cladding layer has a third refractive index n3. The curves of the grating lines are constructed such that the emitting beam is shaped for efficient coupling to another optical component. The curves can also be tilted to reduce coupling back into the waveguide.Type: ApplicationFiled: February 23, 2021Publication date: June 17, 2021Applicants: Mitsubishi Electric Research Laboratories, Inc., Mitsubishi Electric CorporationInventors: Keisuke Kojima, Satoshi Nishikawa, Shusaku Hayashi, Yosuke Suzuki, Jonathan Klamkin, Yingheng Tang
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Publication number: 20210176866Abstract: A printed wiring board includes a resin insulating layer, via conductors formed in the resin insulating layer, metal posts formed on the via conductors, respectively, and a solder resist layer formed on the resin insulating layer such that the metal posts have lower portions embedded in the solder resist layer and upper portions exposed from the solder resist layer, respectively. The metal posts are formed such that each of the metal posts has a top portion having a diameter in a range of 0.8 to 0.9 times a diameter of a respective one of the lower portions of the metal posts.Type: ApplicationFiled: November 27, 2020Publication date: June 10, 2021Applicant: IBIDEN CO., LTD.Inventors: Masashi AWAZU, Keisuke KOJIMA
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Patent number: 10996400Abstract: An optical waveguide interferometer that includes a first optical section, a second optical section, and a set of optical waveguides configured to connect the first and second optical sections, such that light propagating between the first optical section and the second optical section passes through each optical waveguide in the set, wherein the set of optical waveguides includes a first optical waveguide having a first length and a first width and a second optical waveguide having a second length and a second width, wherein the second length is greater than the first length, and the second width is greater than the first width.Type: GrantFiled: August 4, 2016Date of Patent: May 4, 2021Assignees: Mitsubishi Electric Research Laboratories, Inc.Inventors: Keisuke Kojima, Bingnan Wang, Toshiaki Koike-Akino, Koichi Akiyama, Eiji Yagyu, Satoshi Nishikawa, Kosuke Shinohara
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Publication number: 20210116645Abstract: A grating coupler having first and second ends for coupling a light beam to a waveguide of a chip includes a substrate configured to receive the light beam from the first end and transmit the light beam through the second end, the substrate having a first refractive index n1, a grating structure having curved grating lines arranged on the substrate, the grating structure having a second refractive index n1, wherein the curved grating lines have line width w and height d and are arranged by a pitch ?, wherein the second refractive index n2 is less than first refractive index n1, and a cladding layer configured to cover the grating structure, wherein the cladding layer has a third refractive index n3. The curves of the grating lines are constructed such that the emitting beam is shaped for efficient coupling to another optical component. The curves can also be tilted to reduce coupling back into the waveguide.Type: ApplicationFiled: January 28, 2020Publication date: April 22, 2021Applicants: Mitsubishi Electric Research Laboratories, Inc., Mitsubishi Electric CorporationInventors: Keisuke Kojima, Satoshi Nishikawa, Shusaku Hayashi, Yosuke Suzuki, Jonathan Klamkin, Yingheng Tang