Patents by Inventor Takashi Matsui

Takashi Matsui 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).

  • Patent number: 12386278
    Abstract: A toner contains a toner particle containing a resin component and a wax. The resin component contains a vinyl polymer A having a monomer unit A represented by the formula (A): In a luminance histogram created from STEM observation, the total pixel value C in luminance 0 to 9 and the total pixel value A in luminance 0 to 245 satisfy 0.000?C/A?0.250. When the pixel value in luminance 10 to 245 has a maximum value P at luminance X, luminance M-luminance N ranges from 120 to 235, wherein the luminance M denotes a luminance at which the pixel value falls below 20% of P for the first time from the luminance X to 245, and the luminance N denotes a luminance at which the pixel value falls below 20% of the P for the first time from the luminance X to 10.
    Type: Grant
    Filed: December 8, 2021
    Date of Patent: August 12, 2025
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yuna Yamamoto, Shohei Shibahara, Kenji Aoki, Tsutomu Shimano, Takashi Matsui, Takayuki Toyoda
  • Publication number: 20250242867
    Abstract: A rocker component for a vehicle includes a tubular beam having a transverse cross-sectional shape extending continuously along a length of the tubular beam. The transverse cross-sectional shape of the tubular beam includes an inboard portion that has an inboard height dimension and an outboard portion that has an outboard height dimension. The outboard height dimension is less than the inboard height dimension. The transverse cross-sectional shape of the tubular beam also includes an upper planar wall and a lower planar wall that connect linearly between the respective upper and lower ends of the inboard portion and the outboard portion to form a tapered shape.
    Type: Application
    Filed: April 22, 2025
    Publication date: July 31, 2025
    Applicant: Shape Corp.
    Inventors: Takashi Matsui, Kazutoyo Fujikawa, Matthew Kuipers, Zehua Qin
  • Patent number: 12352652
    Abstract: An object of the present invention is to provide an evaluation method and an evaluation device for easily determining whether or not a structural parameter of a multi-core fiber satisfies a desired connection loss value (a specification). The evaluation method according to the present invention includes a step of measuring center coordinates of each core with the center coordinates when a clad is approximated by a circle as an origin in an observed cross-sectional structure of the multi-core fiber to be objected, obtaining a length of a line segment connecting the origin and the center of each core and an angle formed by two line segments connecting the origin and two adjacent cores, and judging whether or not a desired connection loss characteristic is satisfied on the basis of whether or not the values satisfy a predetermined determination formula.
    Type: Grant
    Filed: December 11, 2020
    Date of Patent: July 8, 2025
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Nobutomo Hanzawa, Takashi Matsui, Yuto Sagae, Kazuhide Nakajima
  • Publication number: 20250192888
    Abstract: The present disclosure relates to an optical transmission system that transmits signal light by using a multi-core optical fiber having two or more cores as transmission paths, the optical transmission system including two or more transmitters that transmit signal light to adjacent cores, in opposite directions, of the cores, and two or more pump light oscillators that inject pump light into the same cores as transmission cores to which the signal light is transmitted of the adjacent cores such that the pump light propagates in the same directions as or directions reverse to the directions of the signal light, and perform distributed Raman amplification of the signal light by using the pump light, in which a signal light gain of the signal light transmitted from the transmitters is set such that a signal intensity ratio to a crosstalk noise intensity leaked from the adjacent transmission cores is high.
    Type: Application
    Filed: August 27, 2021
    Publication date: June 12, 2025
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Yuto SAGAE, Kazuhide NAKAJIMA, Taiji SAKAMOTO, Takayoshi MORI, Takashi MATSUI
  • Patent number: 12324730
    Abstract: A disposable diaper having a front-rear direction and a width direction includes: a first waistline region; a second waistline region; a crotch; an absorbent core; a waistband; a body portion disposed on a non-skin facing surface side of the waistband; and a space that opens toward the crotch region disposed on the non-skin facing surface side of the waistband. The body portion includes a first outer end edge that is an outer end edge in the front-rear direction in the first waistline region. In a natural state of half fold in which the waistband is sandwiched by the body portion and the disposable diaper is folded at a fold line extending in the width direction as a base point in the crotch region, a part of the waistband protrudes from the first outer end edge in the front-rear direction.
    Type: Grant
    Filed: June 1, 2021
    Date of Patent: June 10, 2025
    Assignee: Unicharm Corporation
    Inventors: Takashi Matsui, Yasuhiro Yamanaka, Satoru Sakaguchi
  • Patent number: 12318467
    Abstract: Providing a cosmetic having a smooth after-feel even if the cosmetic contains a high proportion of oil. A cosmetic includes (A) a starch powder, and as oils, (B) a polar oil and (C) a volatile oil. The ratio of (C) the volatile oil to (B) the polar oil being 0.5 or higher.
    Type: Grant
    Filed: September 15, 2020
    Date of Patent: June 3, 2025
    Assignee: Shiseido Company, Ltd.
    Inventors: Kouichi Nagai, Takashi Matsui
  • Publication number: 20250093575
    Abstract: An object of the present disclosure is to provide an optical fiber having a simple structure, as well as attaining removal of loss components generated in an electric field part oozing out to a core-clad interface or a clad region and reduction in scattering loss generated from an interface with the clad region. The present disclosure relates to an optical fiber including a core for propagating light, a cladding disposed around the core, an air layer between the core and the cladding, and two or more bridges for supporting the core in the air layer.
    Type: Application
    Filed: August 4, 2021
    Publication date: March 20, 2025
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Takashi MATSUI, Kazuhide NAKAJIMA, Nobutomo HANZAWA, Yuto SAGAE
  • Publication number: 20250076568
    Abstract: The present disclosure is a photonic crystal fiber in which a plurality of holes are formed in a cladding, having a uniform light refractive index, capable of propagating three modes of a fundamental mode, a first higher-order mode, and a second higher-order mode, wherein the plurality of holes are disposed in a triangular lattice pattern so as to surround a center of the photonic crystal fiber with no hole disposed at the center of the photonic crystal fiber, and the photonic crystal fiber has a ratio d/A of a diameter d of each of the holes to a pitch A between the holes such that a confinement loss of a third higher-order mode at a minimum wavelength within a used wavelength range is 1.0 dB/m or more and a confinement loss at a maximum wavelength is 0.001 dB/km or less.
    Type: Application
    Filed: August 2, 2021
    Publication date: March 6, 2025
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Nobutomo HANZAWA, Takayoshi MORI, Takashi MATSUI, Yoko YAMASHITA, Kazuhide NAKAJIMA
  • Publication number: 20250060213
    Abstract: The present disclosure is a shape measurement system including: a multi-core optical fiber in which four or more cores are disposed in a part other than the center of a cross section; a strain distribution measurement device configured to measure a strain distribution of each of the cores in a longitudinal direction of the multi-core optical fiber; and an analysis device configured to calculate a shape of the multi-core optical fiber by using the strain distribution of the multi-core optical fiber.
    Type: Application
    Filed: November 29, 2022
    Publication date: February 20, 2025
    Applicants: NIPPON TELEGRAPH AND TELEPHONE CORPORATION, THE UNIVERSITY OF TOKYO
    Inventors: Nobutomo HANZAWA, Kazuhide NAKAJIMA, Takashi MATSUI, Hideaki MURAYAMA, Ryota WADA, Makito KOBAYAHSI
  • Patent number: 12203847
    Abstract: A shape measurement system and method for a three-dimensional shape of a linear object over a long distance with high resolution. The shape measurement system comprises: a multicore optical fiber having a center core positioned in the center of the cross section thereof and three or more outer peripheral cores positioned at equal intervals concentrically with respect to and outside of the center core; a measurement device for measuring the backward Brillouin scattered light distribution in the propagation direction of each core of the multicore optical fiber; and an analysis device for calculating position coordinates, in three-dimensional space, of a linear structure having an unknown three-dimensional shape from the backward Brillouin scattered light distributions of a multicore optical fiber positioned along the linear structure having an unknown three-dimensional shape and a multicore optical fiber positioned along a linear structure having a known three-dimensional shape.
    Type: Grant
    Filed: June 3, 2021
    Date of Patent: January 21, 2025
    Assignees: NIPPON TELEGRAPH AND TELEPHONE CORPORATION, THE UNIVERSITY OF TOKYO
    Inventors: Nobutomo Hanzawa, Kazuhide Nakajima, Takashi Matsui, Hideaki Murayama, Ryota Wada, Makito Kobayashi
  • Patent number: 12189178
    Abstract: The optical fiber according to the present invention includes, in a cross section of the optical fiber, one core region (11) and a cladding region (12) that is arranged on an outer periphery of the core region. The cladding region is a medium that has a lower refractive index than that of the core region and also has a smaller refractive index wavelength dispersion than that of the core region. The optical fiber has a solid core and therefore, allows more reduction in the Rayleigh scattering loss compared to an optical fiber having a hollow core. In addition, since the optical fiber adopts, for the cladding region, a medium that has a smaller refractive index wavelength dispersion than that of the core region, it allows a reduction in the wavelength dispersion of neff.
    Type: Grant
    Filed: June 3, 2020
    Date of Patent: January 7, 2025
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Yuto Sagae, Takashi Matsui, Kazuhide Nakajima
  • Publication number: 20250001036
    Abstract: An object of the present invention is to provide an air conditioner unit that can fully demonstrate the sterilization effect on air with a large flow rate, even by a method of irradiating a filter and a coil with ultraviolet light. The air conditioner unit according to the present invention includes a filter 20 through which air passes, a plurality of optical fibers 16 arranged in such a manner that one ends thereof are close to a surface of the filter 20 and arranged at predetermined intervals, and a light source 30 that supplies ultraviolet light from the other end of each of the optical fibers 16. Since the intensity of the light is inversely proportional to the square of the distance from the light source, if the same sterilization effect is to be obtained, the shorter the irradiation distance, the smaller the irradiation intensity of the ultraviolet light can be.
    Type: Application
    Filed: September 30, 2021
    Publication date: January 2, 2025
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Asuka MIYAKE, Hitoshi SISHIMO, Ryuji YAMAMOTO, Tomohiro TANIGUCHI, Ayako IWAKI, Satoshi NARIKAWA, Takahito KIRIHARA, Kazuhide NAKAJIMA, Takashi MATSUI, Yuto SAGAE, Chisato FUKAI, Nobutomo HANZAWA
  • Publication number: 20250004214
    Abstract: An object of the present invention is to provide an optical transmission system capable of reducing system costs and reducing waste of output power of a light source. The optical transmission system according to the present invention includes an ultraviolet light source part 11a having a light emitting diode (LED) that outputs ultraviolet light, an optical transmission line 26 that propagates the ultraviolet light through a plurality of cores of a multi-core optical fiber or a plurality of cores of a bundle optical fiber obtained by bundling a plurality of single-core optical fibers, and an optical system 11c that narrows down a spot shape of the ultraviolet light output from the LED to a size including all of the plurality of cores in an optical axis direction, and causes the ultraviolet light to enter the plurality of cores.
    Type: Application
    Filed: November 10, 2022
    Publication date: January 2, 2025
    Inventors: Takahito KIRIHARA, Satoshi Narikawa, Katsuhisa TAGUCHI, Ayako IWAKI, Kazuhide Nakajima, Takashi Matsui, Chisato Fukai, Yuto SAGAE, Tomohiro TANIGUCHI, Hiroyuki IIDA
  • Patent number: 12181707
    Abstract: The present invention is to provide a multi-core optical fiber that can expand its transmission wavelength band, and extend its transmission distance by reducing crosstalk, and also provide a method for designing the multi-core optical fiber. A multi-core optical fiber according to the present invention includes: four cores that are arranged in a square lattice pattern in a longitudinal direction; and a cladding region that is formed around the outer peripheral portions of the cores and has a lower refractive index than the cores, the absolute value of the relative refractive index difference between the cores and the cladding region being represented by A. In the multi-core optical fiber, the diameter of the cladding region is 125+1 ?m, the cutoff wavelength is 1.45 ?m or shorter, the mode field diameter MFD at a wavelength of 1.55 ?m is 9.5 to 10.0 ?m, the bending loss at a wavelength of 1.625 ?m and with a bending radius of 30 mm is 0.
    Type: Grant
    Filed: August 12, 2020
    Date of Patent: December 31, 2024
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Takashi Matsui, Kazuhide Nakajima, Taiji Sakamoto, Yuto Sagae
  • Publication number: 20240427078
    Abstract: There are provided a multi-core optical fiber including four step-index type cores with a standard cladding diameter and having excellent mass productivity, quality, and yield while meeting desired specifications, and a design method thereof. A multi-core optical fiber according to the present disclosure includes: four cores arranged in a square lattice shape along a longitudinal direction, each of the four cores having a step-index type refractive index distribution with a radius a; and a cladding region having a lower refractive index than that of each core and a diameter of 125±1 ?m and provided on an outer peripheral portion of each core, where an absolute value of a relative refractive index difference between each core and the cladding region is ?.
    Type: Application
    Filed: September 3, 2024
    Publication date: December 26, 2024
    Inventors: Takashi Matsui, Kazuhide Nakajima
  • Publication number: 20240427084
    Abstract: The present disclosure aims to provide a short optical fiber-type mode converter having small wavelength dependency. The present disclosure is about a mode converter including a cladding having a constant refractive index, a core having a refractive index higher than the refractive index of the cladding in the cladding, and a refractive index modulation part provided to obliquely cross the core and having a different refractive index from a refractive index of surroundings.
    Type: Application
    Filed: October 28, 2021
    Publication date: December 26, 2024
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Yoko YAMASHITA, Takayoshi MORI, Takashi MATSUI, Kazuhide NAKAJIMA
  • Patent number: 12174413
    Abstract: Provided are an LPFG and an optical transmission system in which a mode conversion amount does not depend on a polarization state and an electric field distribution. The LPFG according to the present invention includes cavity rows (25-1 and 25-2) of cavities 15 periodically arranged in a core region 11 of the few-mode fiber 10 at a position away from a central axis z of the core region 11 in parallel with the central axis z. Each of the cavity rows (25-1 and 25-2) is located at a different position in a longitudinal direction of the few-mode fiber 10 (where the position in a z direction is different), and the cavity rows (25-1 and 25-2) are located at positions shifted by 90° on a cross section of the core region 11 with the center of the cross section of the core region 11 (the intersection of an x-axis and a y-axis) as an origin.
    Type: Grant
    Filed: September 9, 2020
    Date of Patent: December 24, 2024
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Ryota Imada, Yoko Yamashita, Takashi Matsui, Taiji Sakamoto, Nobutomo Hanzawa, Noriyuki Araki, Shinichi Aozasa, Yuto Sagae, Kazuhide Nakajima
  • Publication number: 20240418073
    Abstract: The present disclosure is a control system configured to: collect a strain distribution of an underwater structure connected to an above-water structure; and control at least one of the underwater structure and the above-water structure in accordance with the strain distribution.
    Type: Application
    Filed: November 29, 2022
    Publication date: December 19, 2024
    Applicants: NIPPON TELEGRAPH AND TELEPHONE CORPORATION, THE UNIVERSITY OF TOKYO
    Inventors: Nobutomo HANZAWA, Kazuhide NAKAJIMA, Takashi MATSUI, Hideaki MURAYAMA, Ryota WADA
  • Patent number: 12158607
    Abstract: A mode loss difference compensator of the present disclosure includes a main waveguide configured to allow propagation of N or more modes (where N is an integer of 3 or more), a first auxiliary waveguide having, at one end thereof, a first coupling portion configured to mode-convert an LP0n mode (where n is an integer of 2 or more) propagating in the main waveguide into a fundamental mode in the first auxiliary waveguide and transfer the fundamental mode from the main waveguide to the first auxiliary waveguide and having, at the other end thereof, a second coupling portion configured to mode-convert the fundamental mode propagating in the first auxiliary waveguide into the LP0n mode (where n is an integer of 2 or more) in the main waveguide and transfer the LP0n mode from the first auxiliary waveguide to the main waveguide, and a second auxiliary waveguide having, at one end thereof, a third coupling portion configured to convert a higher-order mode, other than any LP0n mode (where n is an integer of 2 or mor
    Type: Grant
    Filed: April 24, 2020
    Date of Patent: December 3, 2024
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Yoko Yamashita, Takashi Matsui, Kazuhide Nakajima
  • Publication number: 20240390535
    Abstract: An object of the present invention is to provide an ultraviolet light irradiation sheet that can be decontaminated regardless of a shape of an object to be decontaminated. An ultraviolet light irradiation sheet (50) includes an optical fiber (20) which emits a part of propagating light from a side surface or an end surface; and a deformable sheet (10) which incorporates the optical fiber (20). The ultraviolet light irradiation sheet uniformly or partially irradiates ultraviolet light from a sheet surface. Therefore, by covering the object to be sterilized with the ultraviolet light irradiation sheet, a material having a complicated shape or an amorphous shape can be irradiated with the ultraviolet light without making a shade. Since the ultraviolet light irradiation sheet does not diffuse bacteria and viruses by wind, the sterilization of the object to be sterilized can be performed without forming a closed space.
    Type: Application
    Filed: September 30, 2021
    Publication date: November 28, 2024
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Asuka MIYAKE, Hitoshi SESHIMO, Ryuji YAMAMOTO, Tomohiro TANIGUCHI, Ayako IWAKI, Satoshi NARIKAWA, Takahito KIRIHARA, Kazuhide NAKAJIMA, Takashi MATSUI, Yuto SAGAE, Chisato FUKAI, Nobutomo HANZAWA