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: 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
  • Publication number: 20160231582
    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: Application
    Filed: February 2, 2016
    Publication date: August 11, 2016
    Inventor: Yutaka Yamaguchi
  • Patent number: 9302450
    Abstract: An optical element includes an antireflection film. The antireflection film includes an uppermost layer having a refractive index nd of 1.20 to 1.30, a high refractive index layer having a refractive index of 2.00 to 2.40, and at least one of an intermediate refractive index layer having a refractive index of 1.55 to 1.70 and a low refractive index layer having a refractive index of 1.40 to 1.52. The predetermined condition is satisfied.
    Type: Grant
    Filed: October 30, 2014
    Date of Patent: April 5, 2016
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Yutaka Yamaguchi
  • Patent number: 9297943
    Abstract: The absorptive wire-grid polarizer includes a periodic structure formed on a substrate surface of a dielectric substrate and constituted by a metal and one or more dielectric materials. The periodic structure has a one-dimensional grating structure in which, in a sectional plane orthogonal to a normal to the substrate surface, grating portions of a metal grating formed of the metal and grating portions of dielectric gratings formed of the one or more dielectric materials are one-dimensionally arranged with a grating period P. The Conditions of nm?1.0, km?2.0, 0.01?FF?0.25, Nb?1.40, and h?250 [nm] are satisfied where h represents an entire height of the metal and dielectric gratings, nm represents a refractive index of a real part of a complex refractive index of the metal, km represents an extinction coefficient of an imaginary part of the complex refractive index, and nb represents an average refractive index of the dielectric grating.
    Type: Grant
    Filed: January 3, 2014
    Date of Patent: March 29, 2016
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Yutaka Yamaguchi
  • Patent number: 9235111
    Abstract: A projection display apparatus includes a polarization beam splitter, a first phase compensation plate including two layers, and a light modulator. Each layer has a constant axial angle, and an optical axis of each layer inclines with respect to the x axis in an xz plane. The axial angle of the layer closer to the polarization beam splitter among the two layers is larger than the axial angle of the layer farther from the polarization beam splitter. 20°??max??min?80° is satisfied where ?max is a maximum value of the axial angle and ?min is a minimum value of the axial angle. 40°??ave?70° is satisfied where ?ave is an average value of axial angles of the two layers.
    Type: Grant
    Filed: September 27, 2013
    Date of Patent: January 12, 2016
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Yutaka Yamaguchi
  • Patent number: 9152034
    Abstract: An image display apparatus includes an image display element configured to modulate incident light from a light source, a polarization splitting element that has characteristics of transmitting first polarized light and reflecting second polarized light different from the first polarized light and that is configured to synthesize image light from the image display element to be introduced into a projection optical system, and a phase difference plate that is disposed at a side of the projection optical system relative to the polarization splitting element. The phase difference plate has an optic axis in a direction different from a surface normal direction and an in-plane direction of the phase difference plate.
    Type: Grant
    Filed: December 20, 2011
    Date of Patent: October 6, 2015
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Yutaka Yamaguchi
  • Publication number: 20150130983
    Abstract: A polarizer includes a first medium disposed at an emission side, a second medium disposed at an incident side, and a plurality of laminated structures provided at a predetermined grating period in a grating period direction, the laminated structure includes, in order from the first medium to the second medium, a first dielectric layer, a metallic layer, and a second dielectric layer between the first medium and the second medium, the polarizer is configured to reflect polarized light oscillating in a direction orthogonal to the grating period direction in a particular wavelength band and to transmit light other than the polarized light, and predetermined expressions are satisfied.
    Type: Application
    Filed: November 6, 2014
    Publication date: May 14, 2015
    Inventor: Yutaka Yamaguchi