Patents by Inventor Yutaka Yamaguchi

Yutaka Yamaguchi 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: 11018039
    Abstract: According to the embodiment, the electrostatic chuck includes a ceramic dielectric substrate having a first major surface and a second major surface on an opposite side to the first major surface, a base plate supporting the ceramic dielectric substrate and including a gas introduction path, and a first porous part provided at a position between the base plate and the first major surface and being opposite to the gas introduction path. The ceramic dielectric substrate includes a first hole part positioned between the first major surface and the first porous part. At least one of the ceramic dielectric substrate or the first porous part includes a second hole part positioned between the first hole part and the first porous part, and a dimension of the second hole part is smaller than a dimension of the first porous part and larger than a dimension of the first hole part.
    Type: Grant
    Filed: March 14, 2019
    Date of Patent: May 25, 2021
    Assignee: Toto Ltd.
    Inventors: Kosuke Yamaguchi, Jun Shiraishi, Ikuo Itakura, Yutaka Momiyama, Shuichiro Saigan
  • Publication number: 20210080815
    Abstract: A wavelength conversion element includes a fluorescent portion in which fluorescent particles are dispersed in a binder. The fluorescent portion has a first surface and a second surface which are opposite to each other in a thickness direction and excitation light is irradiated from a second surface side. A volume density of the fluorescent particles in a first portion is higher than that in a second portion where the fluorescent portion is divided in the thickness direction into two of the first portion on a first surface side and the second portion on the second surface side. A thickness of the fluorescent portion is at least 5 times as long as an average particle size of the fluorescent particles.
    Type: Application
    Filed: November 24, 2020
    Publication date: March 18, 2021
    Inventors: Yutaka Yamaguchi, Masayuki Abe, Minoru Ohkoba, Daisuke Ogawa
  • Patent number: 10884329
    Abstract: A wavelength conversion element includes a fluorescent portion in which fluorescent particles are dispersed in a binder. The fluorescent portion has a first surface and a second surface which are opposite to each other in a thickness direction and excitation light is irradiated from a second surface side. A volume density of the fluorescent particles in a first portion is higher than that in a second portion where the fluorescent portion is divided in the thickness direction into two of the first portion on a first surface side and the second portion on the second surface side. A thickness of the fluorescent portion is at least 5 times as long as an average particle size of the fluorescent particles.
    Type: Grant
    Filed: November 16, 2018
    Date of Patent: January 5, 2021
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Yutaka Yamaguchi, Masayuki Abe, Minoru Ohkoba, Daisuke Ogawa
  • Publication number: 20200228732
    Abstract: An imaging apparatus includes an optical low-pass filter that includes first, second, third, and fourth optical anisotropic elements configured to separate an incident ray into a plurality of rays, and a retardation plate disposed between two optical anisotropic elements adjacent to each other among the first to fourth optical anisotropic elements, and an image sensor configured to photoelectrically convert an optical image formed by light that has passed the optical low-pass filter. A predetermined condition is satisfied.
    Type: Application
    Filed: December 18, 2019
    Publication date: July 16, 2020
    Inventors: Yutaka Yamaguchi, Kazuhiko Momoki
  • Patent number: 10712636
    Abstract: The polarization acquisition apparatus is configured to allow an image capturing system including an interchangeable lens and an image capturing apparatus to perform image capturing using polarized light. The polarization acquisition apparatus includes a variable polarization axis element in which a direction of its polarization transmission axis is variable, a driver configured to operate the variable polarization axis element so as to change the direction of the polarization transmission axis, a first mount to which the image capturing apparatus is detachably attachable, and a second mount to which the interchangeable lens is detachably attachable. The driver is configured to operate the variable polarization axis element so as to change the direction of the polarization transmission axis to at least three directions when the image capturing is performed multiple times.
    Type: Grant
    Filed: June 22, 2016
    Date of Patent: July 14, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Rie Ishimatsu, Kazuhiko Momoki, Yutaka Yamaguchi
  • Patent number: 10606148
    Abstract: An optical low-pass filter includes a stack of N (N?3) optical anisotropic layers each configured to separate an incident ray into a plurality of rays, wherein the following condition is satisfied: Ds?0.50 Da, where Da [?m] is a total value of ray separation widths of the first to (N?1)th optical anisotropic layers among the N optical anisotropic layers, and Ds [?m] is a distance between a ray having a maximum phase difference and a ray having a minimum phase difference among the rays separated by the first to (N?1)th optical anisotropic layers.
    Type: Grant
    Filed: August 1, 2018
    Date of Patent: March 31, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Yutaka Yamaguchi
  • Patent number: 10386649
    Abstract: An optical apparatus includes a first phase plate which gives a fixed relative phase difference by ?/2 between a polarization component in a slow axis direction and a polarization component in a fast axis direction, a second phase plate which gives a relative phase difference between a polarization component in a slow axis direction and a polarization component in a fast axis direction, a polarizer which extracts a polarization component to be guided to the image pickup element, and a setter which sets the relative phase difference of the second phase plate, the slow axis direction of the second phase plate is inclined with respect to each of the slow and fast axes directions of the first phase plate, and the setter sets the relative phase difference of the second phase plate depending on the polarization component of light.
    Type: Grant
    Filed: February 2, 2016
    Date of Patent: August 20, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Yutaka Yamaguchi
  • Publication number: 20190226501
    Abstract: A turbocharger includes a compressor housing having an accommodation depression, a return passage, a ring member, and a covering member mounted to the compressor housing. The return passage has an inlet, an outlet, and a communication passage through which the inlet is connected to the outlet. A bottom surface of the accommodation depression has an inlet forming surface that cooperates with the ring member to form the inlet. The communication passage is formed between an inner peripheral surface of the accommodation depression and an outer peripheral surface of the ring member. The covering member has a falling prevention portion and an outlet forming surface. The outlet forming surface cooperates with the ring member to form the outlet. The falling prevention portion is located between the ring member and the outlet forming surface, and contacts the ring member to prevent the ring member from falling off the accommodation depression.
    Type: Application
    Filed: January 21, 2019
    Publication date: July 25, 2019
    Applicant: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
    Inventors: Tatsuya ARAKAWA, Hidetoshi HARIMA, Shuichi HIROTA, Yutaka YAMAGUCHI, Kazushige MURAO
  • Patent number: 10317589
    Abstract: An optical low-pass filter is arranged on an object side than an image sensor in an image pickup apparatus and has an unevenness shape. The conditions of 5.0 ?m??z?80.0 ?m and 1.0?Ps/<Pf>?20.0 are satisfied where ?z represents a distance between the optical low-pass filter and the image sensor, Ps represents a pixel pitch of the image sensor, and <Pf> represents an average pitch of the unevenness shape.
    Type: Grant
    Filed: May 3, 2016
    Date of Patent: June 11, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Kei Ueda, Kazuhiko Momoki, Yutaka Yamaguchi
  • Publication number: 20190101814
    Abstract: A wavelength conversion element includes a fluorescent portion in which fluorescent particles are dispersed in a binder. The fluorescent portion has a first surface and a second surface which are opposite to each other in a thickness direction and excitation light is irradiated from a second surface side. A volume density of the fluorescent particles in a first portion is higher than that in a second portion where the fluorescent portion is divided in the thickness direction into two of the first portion on a first surface side and the second portion on the second surface side. A thickness of the fluorescent portion is at least 5 times as long as an average particle size of the fluorescent particles.
    Type: Application
    Filed: November 16, 2018
    Publication date: April 4, 2019
    Inventors: Yutaka Yamaguchi, Masayuki Abe, Minoru Ohkoba, Daisuke Ogawa
  • Publication number: 20190049820
    Abstract: An optical low-pass filter includes a stack of N (N?3) optical anisotropic layers each configured to separate an incident ray into a plurality of rays, wherein the following condition is satisfied: Ds?0.50 Da, where Da [?m] is a total value of ray separation widths of the first to (N?1)th optical anisotropic layers among the N optical anisotropic layers, and Ds [?m] is a distance between a ray having a maximum phase difference and a ray having a minimum phase difference among the rays separated by the first to (N?1)th optical anisotropic layers.
    Type: Application
    Filed: August 1, 2018
    Publication date: February 14, 2019
    Inventor: Yutaka Yamaguchi
  • Patent number: 10139548
    Abstract: An optical apparatus is configured to introduce light from an object to an image pickup element, and includes first, second, and third retardation plates, a polarizer, and a setter. The first retardation plate, the second retardation plate, and the polarizer are arranged in this order from a side of the object to a side of the image pickup element. The slow axis direction or the fast axis direction of the second retardation plate tilts to the slow axis direction or the fast axis direction of the first retardation plate. The setter sets the retardation of the second retardation plate according to the polarization component of the light from the object.
    Type: Grant
    Filed: June 29, 2017
    Date of Patent: November 27, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Yutaka Yamaguchi
  • Patent number: 10073327
    Abstract: An optical apparatus includes a first retardation plate giving a retardation between polarization components in slow and fast axis directions, a second retardation plate changing a relative retardation between polarization components in slow and fast axis directions, and a polarizer extracting a polarization component guided to the image pickup element. The first and second retardation plates, and the polarizer are disposed in order from an object side. The slow or fast axis direction of the first retardation plate is parallel to a polarization direction of the polarization component extracted by the polarizer. The slow or fast axis direction of the second retardation plate is inclined by 45 degrees with respect to the polarization direction. When a design wavelength is ?, a phase change amount being a difference between maximum and minimum values of the relative retardations is in a range from 2?/5 to 3?/5 both inclusive.
    Type: Grant
    Filed: March 23, 2017
    Date of Patent: September 11, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Rie Ishimatsu, Kazuhiko Momoki, Yutaka Yamaguchi
  • Patent number: 10035710
    Abstract: The present invention provides a method for producing lithium carbonate, that can shorten the time required in the production of lithium carbonate and has excellent maintenance property and production efficiency without forming fixed matters that require complicated procedures to remove in a reaction apparatus.
    Type: Grant
    Filed: October 26, 2016
    Date of Patent: July 31, 2018
    Assignees: NITTETSU MINING CO., LTD., Sumitomo Corporation
    Inventors: Masanobu Kawata, Kohei Mitsuhashi, Akemitsu Iida, Yutaka Yamaguchi, Atsushi Moriya
  • Publication number: 20180011239
    Abstract: An optical apparatus is configured to introduce light from an object to an image pickup element, and includes first, second, and third retardation plates, a polarizer, and a setter. The first retardation plate, the second retardation plate, and the polarizer are arranged in this order from a side of the object to a side of the image pickup element. The slow axis direction or the fast axis direction of the second retardation plate tilts to the slow axis direction or the fast axis direction of the first retardation plate. The setter sets the retardation of the second retardation plate according to the polarization component of the light from the object.
    Type: Application
    Filed: June 29, 2017
    Publication date: January 11, 2018
    Inventor: Yutaka Yamaguchi
  • Publication number: 20170277023
    Abstract: An optical apparatus includes a first retardation plate giving a retardation between polarization components in slow and fast axis directions, a second retardation plate changing a relative retardation between polarization components in slow and fast axis directions, and a polarizer extracting a polarization component guided to the image pickup element. The first and second retardation plates, and the polarizer are disposed in order from an object side. The slow or fast axis direction of the first retardation plate is parallel to a polarization direction of the polarization component extracted by the polarizer. The slow or fast axis direction of the second retardation plate is inclined by 45 degrees with respect to the polarization direction. When a design wavelength is ?, a phase change amount being a difference between maximum and minimum values of the relative retardations is in a range from 2?/5 to 3?/5 both inclusive.
    Type: Application
    Filed: March 23, 2017
    Publication date: September 28, 2017
    Inventors: Rie Ishimatsu, Kazuhiko Momoki, Yutaka Yamaguchi
  • Patent number: 9709705
    Abstract: An anti-reflection film includes first through ninth layers. Regarding light having a wavelength of 550 nm, where the refractive indexes of the first through ninth layers are n1 through n9 respectively, the optical film thicknesses d1 through d9 (nm) respectively, and the maximum value of the difference in the refractive index between adjoining layers for layers 1 through 8 is ?n, the following conditions are satisfied. 1.60?n1?1.70, 15 nm?d1?140 nm, 2.00?n2?2.40, 20 nm?d2?120 nm, 1.60?n3?1.70, 11 nm?d3?70 nm, 2.00?n4?2.40, 20 nm?d4?165 nm, 1.60?n5?1.70, 15 nm?d5?45 nm, 2.00?n6?2.40, 90 nm?d6?175 nm, 1.60?n7?1.70, 50 nm?d7?110 nm, 2.00?n8?2.40, 20 nm?d8?50 nm, 1.20?n9?1.28, 140 nm?d9?160 nm, and 0.40??n?0.67.
    Type: Grant
    Filed: June 30, 2014
    Date of Patent: July 18, 2017
    Assignee: Canon Kabushiki Kaisha
    Inventors: Sayoko Amano, Yutaka Yamaguchi, Kazuhiko Momoki
  • Publication number: 20170113942
    Abstract: The present invention provides a method for producing lithium carbonate, that can shorten the time required in the production of lithium carbonate and has excellent maintenance property and production efficiency without forming fixed matters that require complicated procedures to remove in a reaction apparatus.
    Type: Application
    Filed: October 26, 2016
    Publication date: April 27, 2017
    Applicants: NITTETSU MINING CO., LTD., SUMITOMO CORPORATION, TOYO ENGINEERING CORPORATION
    Inventors: Masanobu KAWATA, Kohei MITSUHASHI, Akemitsu IIDA, Yutaka YAMAGUCHI, Atsushi MORIYA
  • Publication number: 20160370688
    Abstract: The polarization acquisition apparatus is configured to allow an image capturing system including an interchangeable lens and an image capturing apparatus to perform image capturing using polarized light. The polarization acquisition apparatus includes a variable polarization axis element in which a direction of its polarization transmission axis is variable, a driver configured to operate the variable polarization axis element so as to change the direction of the polarization transmission axis, a first mount to which the image capturing apparatus is detachably attachable, and a second mount to which the interchangeable lens is detachably attachable. The driver is configured to operate the variable polarization axis element so as to change the direction of the polarization transmission axis to at least three directions when the image capturing is performed multiple times.
    Type: Application
    Filed: June 22, 2016
    Publication date: December 22, 2016
    Inventors: Rie Ishimatsu, Kazuhiko Momoki, Yutaka Yamaguchi
  • Publication number: 20160334555
    Abstract: An optical low-pass filter is arranged on an object side than an image sensor in an image pickup apparatus and has an unevenness shape. The conditions of 5.0 ?m??z?80.0 ?m and 1.0?Ps/<Pf>?20.0 are satisfied where ?z represents a distance between the optical low-pass filter and the image sensor, Ps represents a pixel pitch of the image sensor, and <Pf> represents an average pitch of the unevenness shape.
    Type: Application
    Filed: May 3, 2016
    Publication date: November 17, 2016
    Inventors: Kei Ueda, Kazuhiko Momoki, Yutaka Yamaguchi