Patents by Inventor Koichi Akiyama

Koichi Akiyama 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).

  • Publication number: 20220016818
    Abstract: Provided are an injection molding machine and an injection molding method. An injection molding machine includes: a plasticizing unit which rotates a screw to plasticize a molding material inside a plastication cylinder, and an injection unit. The injection unit has: a plunger reciprocally moving inside an injection chamber, and an injection driving device reciprocally moving the plunger. By driving the injection driving device to move the plunger backward and forward inside the injection chamber, and driving a rotary driving device to alternately rotate the screw in a normal rotation direction and a reverse rotation direction, the molding material is controlled to reciprocate between the plastication cylinder and the injection chamber.
    Type: Application
    Filed: July 19, 2021
    Publication date: January 20, 2022
    Applicant: Sodick Co., Ltd.
    Inventors: Yoshikazu KUBO, Hisakazu ARAKI, Koichi HIROTA, Kenzo AKIYAMA
  • Patent number: 11215364
    Abstract: A combustor includes: a first cylindrical body which is configured to hold a fuel nozzle extending in an axial line direction and through which air flows toward a downstream side thereof; a second cylindrical body that is connected to a downstream side of the first cylindrical body; and an outer shell that has an inner peripheral surface configured to define an air introduction channel through which air is introduced such that the air reverses course at an upstream end of the first cylindrical body and flows toward the downstream side together with an outer peripheral surface of the first cylindrical body. The inner peripheral surface has an outside narrowing surface that is formed to extend inward in a radial direction toward the upstream end of the first cylindrical body.
    Type: Grant
    Filed: February 27, 2017
    Date of Patent: January 4, 2022
    Assignee: MITSUBISHI POWER, LTD.
    Inventors: Kenji Miyamoto, Satoshi Takiguchi, Koichi Nishida, Yoshitaka Hirata, Shohei Numata, Keita Yunoki, Yasuhiro Akiyama, Tomoki Uruno
  • Patent number: 11204544
    Abstract: A projector includes a first light source device configured to emit first light having a first wavelength band, a second light source device configured to emit second light having a second wavelength band, a first light modulator configured to modulate the first light, and a second light modulator configured to modulate the second light. The first light source device includes a first light emitting element configured to emit excitation light and a wavelength converter configured to convert the excitation light into the first light. The second light source device includes a second light emitting element configured to emit the second light, a diffuser configured to diffuse the second light, and an optical element having an aspherical surface. The optical element is disposed on an optical path of the second light between the diffuser and the second light modulator and is configured to increase field curvature on the second light modulator.
    Type: Grant
    Filed: November 11, 2020
    Date of Patent: December 21, 2021
    Assignee: SEIKO EPSON CORPORATION
    Inventor: Koichi Akiyama
  • Publication number: 20210391694
    Abstract: An optical transmission apparatus includes a first multilevel optical phase modulator and a first semiconductor optical amplifier. The first semiconductor optical amplifier includes a first active region having a first multiple quantum well structure. Assuming that a first number of layers of a plurality of first well layers is defined as n1 and a first length of the first active region is defined as L1 (?m): (a) n1=5 and 400?L1?563; (b) n1=6 and 336?L1?470; (c) n1=7 and 280?L1?432; (d) n1=8 and 252?L1?397; (e) n1=9 and 224?L1?351; or (f) n1=10 and 200?L1?297.
    Type: Application
    Filed: December 5, 2019
    Publication date: December 16, 2021
    Applicant: Mitsubishi Electric Corporation
    Inventors: Shusaku HAYASHI, Satoshi NISHIKAWA, Koichi AKIYAMA
  • Patent number: 11197614
    Abstract: An infrared light source radiates, to an ATR prism, infrared light in entirety or part of a wavelength range with absorption wavelengths of a biological material. The ATR prism is adherable to a measurement skin. A prism vibration controller is mounted on the ATR prism and vibrates the ATR prism perpendicular to a contact surface between the ATR prism and the measurement skin. A controller causes an infrared photodetector to detect infrared light in synchronization with the vibration of the ATR prism.
    Type: Grant
    Filed: September 22, 2017
    Date of Patent: December 14, 2021
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Kentaro Enoki, Kosuke Shinohara, Koichi Akiyama, Shimpei Ogawa, Daisuke Fujisawa
  • Publication number: 20210382381
    Abstract: An illuminator includes a light emitting apparatus which outputs first light belonging to a first wavelength band, a wavelength converter which converts part of the first light into second light belonging to a second wavelength band and causes the second and remainder of the first light to exit, a first optical system with positive power and which the first light enters, an optical element which the remaining first light enters and which reflects either the first or second light and transmits the other, a second optical system with positive power and which the first from the optical element and second light from the converter enter, a third optical system with positive power and causes the first light from the second optical system to enter the converter, and a fourth optical system with positive power and which the second light from the second optical system enters.
    Type: Application
    Filed: June 3, 2021
    Publication date: December 9, 2021
    Applicant: SEIKO EPSON CORPORATION
    Inventor: Koichi AKIYAMA
  • Patent number: 11190739
    Abstract: An illuminator includes a first laser light source section that outputs a first light flux that belongs to a first wavelength band, a second laser light source section that outputs a second light flux that belongs to a second wavelength band, a third laser light source section that outputs a third light flux that belongs to a third wavelength band and has a polarization direction different from those of the first and second light fluxes, a light combiner that combines the first, second, and third light fluxes to produce combined light, and a predetermined band retardation film on the downstream of the light combiner that changes the phase of a light flux that forms the combined light and belongs to the third wavelength band, and the polarization directions of the light fluxes contained in the combined light are aligned on the downstream of the predetermined band retardation film.
    Type: Grant
    Filed: December 10, 2019
    Date of Patent: November 30, 2021
    Assignee: SEIKO EPSON CORPORATION
    Inventor: Koichi Akiyama
  • Patent number: 11187969
    Abstract: A present disclosure relates to a projector including a light source, an excitation light source, a wavelength converter, a collimator system that parallelizes fluorescence outputted from the wavelength converter, a light separator that separates the fluorescence into second light and third light, a correction lens provided in an optical path of the second or third light, a superimposing lens, a light modulator having a plurality of pixels each including first, second, and third sub-pixels, a microlens array including a plurality of microlenses corresponding to the plurality of pixels, and a projection optical apparatus. First light is incident on a first position on the superimposing lens, the second light is incident on a second position on the superimposing lens, and the third light is incident on a third position on the superimposing lens.
    Type: Grant
    Filed: December 20, 2019
    Date of Patent: November 30, 2021
    Assignee: SEIKO EPSON CORPORATION
    Inventor: Koichi Akiyama
  • Patent number: 11175520
    Abstract: An optical semiconductor device includes a semiconductor substrate, a first semiconductor layer provided on the semiconductor substrate, and a mesa waveguide provided on the principal surface of the first semiconductor layer. The semiconductor device also includes a buried layer covering the upper surface of the first semiconductor layer. Part of the upper surface of the first semiconductor layer is exposed. A mesa structure provided at the boundary between a part of the first semiconductor layer is covered with the buried layer and a part of the first semiconductor layer is exposed. One side of the mesa structure is covered with the buried layer, and the other side is exposed. The optical semiconductor device can reduce the generation of stress in the buried layer, for example, to suppress the occurrence of cracks in the buried layer and enhance the reliability.
    Type: Grant
    Filed: October 2, 2018
    Date of Patent: November 16, 2021
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Yuichiro Horiguchi, Satoshi Nishikawa, Koichi Akiyama, Keigo Fukunaga, Yohei Hokama, Yosuke Suzuki
  • Publication number: 20210341813
    Abstract: It is an object of the present invention to provide a technique for making it possible to reduce the size of a Mach-Zehnder type optical modulator. In a clad layer, provided are a plurality of first and second via holes along an optical waveguide. The Mach-Zehnder type optical modulator includes a first travelling wave electrode connected to a first semiconductor region through the plurality of first via holes, extending along the optical waveguide in a plan view to have a width which is wider and a length and a second travelling wave electrode connected to a second semiconductor region through the plurality of second via holes, extending along the optical waveguide in a plan view to have a width which is wider and a length.
    Type: Application
    Filed: December 6, 2018
    Publication date: November 4, 2021
    Applicant: Mitsubishi Electric Corporation
    Inventors: Marika NAKAMURA, Shusaku HAYASHI, Koichi AKIYAMA
  • Patent number: 11126076
    Abstract: An illumination optical apparatus includes a light source apparatus that outputs light in a first direction along an illumination optical axis and a homogenizer. The light source apparatus includes first to fourth light exiting sections via which first to fourth color light fluxes exit. The homogenizer includes a first array set, a second array set, a third array set, a fourth array set, and a superimposing lens. The array sets each include a pair of lens arrays, and at least one of the array sets inclines with respect to an imaginary plane perpendicular to the illumination optical axis in such a way that a first area is shifted in the first direction from a second area the distance from which to the illumination optical axis is longer than the distance from the first area to the illumination optical axis.
    Type: Grant
    Filed: August 28, 2020
    Date of Patent: September 21, 2021
    Assignee: SEIKO EPSON CORPORATION
    Inventor: Koichi Akiyama
  • Patent number: 11119394
    Abstract: A light source device configured to emit a light beam in a first direction includes a first exit position from which a first colored light beam is emitted, a second exit position from which a second colored light beam is emitted, a third exit position from which a third colored light beam is emitted, and a fourth exit position from which a fourth colored light beam is emitted, at least one of the first through fourth colored light beams is a target colored light beam which has a peak wavelength out of a reference wavelength range, and a beam diameter of which is to be adjusted, an adjusting element disposed on a light path of the target colored light beam.
    Type: Grant
    Filed: August 26, 2020
    Date of Patent: September 14, 2021
    Assignee: SEIKO EPSON CORPORATION
    Inventor: Koichi Akiyama
  • Publication number: 20210263401
    Abstract: A light source apparatus according to an aspect of the present disclosure includes a light emitter that outputs light, a multi-lens array having a first surface on which the light outputted from the light emitter is incident and a second surface via which the light incident via the first surface exits, a light transmissive member having a third surface on which the light that exits via the second surface is incident and a fourth surface via which the light incident via the third surface exits, and a seal member that seals the space between the second surface and the third surface, and the multi-lens array forms a focal point which is located on the light exiting side with respect to the first surface and where the light that enters the multi-lens array is focused.
    Type: Application
    Filed: February 24, 2021
    Publication date: August 26, 2021
    Inventor: Koichi AKIYAMA
  • Publication number: 20210216004
    Abstract: A light source apparatus according to the present disclosure includes a light source section, a first polarization separator that transmits in a first polarization component of the first light and reflects a second polarization component of the first light, a second polarization separator that reflects the first polarization component, a diffuser that diffuses the second polarization component and causes the diffused second polarization component, a first wavelength converter that converts the wavelength of the first polarization component into second light, and a second wavelength converter that is disposed in a position shifted in a fifth direction from a placement plane where the first polarization separator and the second polarization separator are placed, converts the wavelength of the excitation light into third light, and the second polarization separator transmits the first polarization component of the second light and reflects the second polarization component of the second light.
    Type: Application
    Filed: January 14, 2021
    Publication date: July 15, 2021
    Inventors: Wataru YASUMATSU, Koichi AKIYAMA
  • Publication number: 20210181615
    Abstract: A light source apparatus according to an aspect of the present disclosure includes a light source section, a first polarization separator that transmits a first polarization component of first light and reflects a second polarization component of the first light, a second polarization separator that reflects the first polarization component, transmits a third polarization component of second light, and reflects a fourth polarization component of the second light, a diffuser that diffuses the second polarization component and causes the diffused second polarization component, and a wavelength converter that converts the wavelength of the first polarization component and causes the second light. The first polarization separator includes a first polarization separation layer and first bases. The second polarization separator includes a second polarization separation layer and second bases. At least one of the first bases and the second bases is made of quartz.
    Type: Application
    Filed: December 16, 2020
    Publication date: June 17, 2021
    Inventor: Koichi AKIYAMA
  • Publication number: 20210181616
    Abstract: A light source apparatus according to an aspect of the present disclosure includes a light source section, a first polarization separator that transmits a first polarization component of first light and reflects a second polarization component of the first light, a second polarization separator that reflects the first polarization component, transmits a third polarization component of second light, and reflects a fourth polarization component of the second light, a diffuser that diffuses the second polarization component and causes the diffused second polarization component, a wavelength converter that converts the wavelength of the first polarization component and causes the second light, and a first phase retarder that is provided in the optical path of the first light between the first polarization separator and the second polarization separator and converts the first polarization component of the first light into the second polarization component.
    Type: Application
    Filed: December 16, 2020
    Publication date: June 17, 2021
    Inventor: Koichi AKIYAMA
  • Publication number: 20210165313
    Abstract: A projector includes a first light source, a first light modulator on which first light is incident, a first polarization separator disposed on a first optical path along which the first light emitted from the first light source and entering the first light modulator travels, a first retardation film disposed on the first optical path, a first reflector disposed on the first optical path, and a second light modulator on which second light different from the first light is incident. The first optical path passes through the first polarization separator and the first retardation film, is then deflected back by the first reflector, and reaches the first light modulator via the first retardation film and the first polarization separator. A second optical path along which the second light travels is independent of the first optical path and does not intersect the first optical path.
    Type: Application
    Filed: November 25, 2020
    Publication date: June 3, 2021
    Inventor: Koichi AKIYAMA
  • Publication number: 20210157222
    Abstract: A light source device according to the present disclosure includes a light source section for emitting a first pencil and a second pencil, a first optical element for altering a proceeding direction of a principal ray of the first pencil, a second optical element for altering a proceeding direction of a principal ray of the second pencil, a wavelength conversion layer having a plane of incidence, a reflecting surface, a first side surface, and a second side surface, a first reflecting element having a first reflecting surface, and a second reflecting element having a second reflecting surface.
    Type: Application
    Filed: November 24, 2020
    Publication date: May 27, 2021
    Applicant: SEIKO EPSON CORPORATION
    Inventor: Koichi AKIYAMA
  • Publication number: 20210157039
    Abstract: A light source device according to the present disclosure includes a light source section for emitting a first pencil and a second pencil which have a first wavelength band, a first optical element for altering a proceeding direction of a principal ray of the first pencil, a second optical element for altering a proceeding direction of a principal ray of the second pencil, and a wavelength conversion layer having a plane of incidence which the first pencil and the second pencil enter, and for performing wavelength conversion of the first pencil and the second pencil into fluorescence having a second wavelength band. The first optical element and the second optical element alter the proceeding directions of the principal ray of the first pencil and the principal ray of the second pencil so that the first pencil and the second pencil fail to overlap each other on the plane of incidence.
    Type: Application
    Filed: November 24, 2020
    Publication date: May 27, 2021
    Applicant: SEIKO EPSON CORPORATION
    Inventor: Koichi AKIYAMA
  • Publication number: 20210141302
    Abstract: A projector includes a first light source device configured to emit first light having a first wavelength band, a second light source device configured to emit second light having a second wavelength band, a first light modulator configured to modulate the first light, and a second light modulator configured to modulate the second light. The first light source device includes a first light emitting element configured to emit excitation light and a wavelength converter configured to convert the excitation light into the first light. The second light source device includes a second light emitting element configured to emit the second light, a diffuser configured to diffuse the second light, and an optical element having an aspherical surface. The optical element is disposed on an optical path of the second light between the diffuser and the second light modulator and is configured to increase field curvature on the second light modulator.
    Type: Application
    Filed: November 11, 2020
    Publication date: May 13, 2021
    Inventor: Koichi AKIYAMA