Patents by Inventor Seiji Sumi

Seiji Sumi 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: 20220143928
    Abstract: An NC device, which is a numerical control device, includes: a program analyzing unit that analyzes a machining program to obtain a movement path along which to move a supply position of a material on a workpiece; a storage temperature extracting unit that extracts, from data on surface temperature of the workpiece, storage temperature in an area including the movement path on the workpiece; a layering volume calculating unit that calculates a volume of a layer forming an object on the basis of a relation between the storage temperature and a volume of the material that solidifies at the storage temperature in a given time; and a layering shape changing unit that changes a shape of the layer on the basis of the volume of the layer.
    Type: Application
    Filed: June 25, 2019
    Publication date: May 12, 2022
    Applicant: Mitsubishi Electric Corporation
    Inventors: Seiji UOZUMI, Nobuhiro SHINOHARA, Daiji MORITA, Nobuyuki SUMI
  • Patent number: 8488918
    Abstract: Provided is a semiconductor optical device, which has a buried heterostructure structure and is formed in a structure capable of reducing a parasitic capacitance to further improve characteristics thereof, and also provided are an optical transmitter module, an optical transceiver module, and an optical transmission equipment. The semiconductor optical device includes a modulator portion for modulating light input along an emitting direction and radiating the modulated light, the modulator portion including: a mesa-stripe structure, which includes an active layer and extends in the emitting direction; and a buried layer provided adjacent to each side of the mesa-stripe structure, in which a distance between a lower surface of the buried layer and a lower surface of the active layer is 20% or more of a distance between the lower surface and an upper surface of the buried layer.
    Type: Grant
    Filed: May 16, 2011
    Date of Patent: July 16, 2013
    Assignee: Oclaro Japan, Inc.
    Inventors: Seiji Sumi, Shigenori Hayakawa, Kaoru Okamoto, Shunya Yamauchi, Yasushi Sakuma
  • Publication number: 20120008895
    Abstract: Provided is a semiconductor optical device, which has a buried heterostructure structure and is formed in a structure capable of reducing a parasitic capacitance to further improve characteristics thereof, and also provided are an optical transmitter module, an optical transceiver module, and an optical transmission equipment. The semiconductor optical device includes a modulator portion for modulating light input along an emitting direction and radiating the modulated light, the modulator portion including: a mesa-stripe structure, which includes an active layer and extends in the emitting direction; and a buried layer provided adjacent to each side of the mesa-stripe structure, in which a distance between a lower surface of the buried layer and a lower surface of the active layer is 20% or more of a distance between the lower surface and an upper surface of the buried layer.
    Type: Application
    Filed: May 16, 2011
    Publication date: January 12, 2012
    Applicant: OPNEXT JAPAN, INC.
    Inventors: Seiji SUMI, Shigenori HAYAKAWA, Kaoru OKAMOTO, Shunya YAMAUCHI, Yasushi SAKUMA
  • Patent number: 7409113
    Abstract: This invention provides an optical transmitter module and an optical module using an EA modulator capable of realizing stable ACER regardless of operating temperature without using a control mechanism for maintaining temperature of the EA modulator constant. In the EA modulator, optical waveguides formed of a multi-layered film are formed on a substrate, an electrical signal is applied to the optical waveguides in a direction vertical to the substrate, and the input light absorption amount is changed to control the amount of output light. Also, a plurality of p-side electrodes electrically separated from each other for applying an electrical signal to the active layer optical waveguides are arranged on optical axes of active layer optical waveguides. The length of optical waveguides to which the electrical signal is applied is changed by controlling the number of p-side electrodes to which the electrical signal is applied in accordance with temperature.
    Type: Grant
    Filed: December 23, 2004
    Date of Patent: August 5, 2008
    Assignee: Opnext Japan, Inc.
    Inventors: Seiji Sumi, Kazuhisa Uomi, Hiroyuki Kamiyama, Kazuhiko Naoe
  • Patent number: 7190872
    Abstract: The present invention provides a polarization dependency-free, gain-saturated high function semiconductor optical amplifier and optical module at industrially low cost. The gist of the present invention is to structurally separate the optical signal propagating waveguide from another optical waveguide which serves as a lasing optical cavity for optical amplification in such a manner that the two optical waveguides are formed in the same plane but not parallel to each other.
    Type: Grant
    Filed: March 13, 2006
    Date of Patent: March 13, 2007
    Assignee: OpNext Japan, Inc.
    Inventors: Hiroyuki Kamiyama, Kenji Uchida, Seiji Sumi
  • Patent number: 7127145
    Abstract: The present invention provides a polarization dependency-free, gain-saturated high function semiconductor optical amplifier and optical module at industrially low cost. The gist of the present invention is to structurally separate the optical signal propagating waveguide from another optical waveguide which serves as a lasing optical cavity for optical amplification in such a manner that the two optical waveguides are formed in the same plane but not parallel to each other.
    Type: Grant
    Filed: May 20, 2004
    Date of Patent: October 24, 2006
    Assignee: OpNext Japan, Inc.
    Inventors: Hiroyuki Kamiyama, Kenji Uchida, Seiji Sumi
  • Publication number: 20060165363
    Abstract: The present invention provides a polarization dependency-free, gain-saturated high function semiconductor optical amplifier and optical module at industrially low cost. The gist of the present invention is to structurally separate the optical signal propagating waveguide from another optical waveguide which serves as a lasing optical cavity for optical amplification in such a manner that the two optical waveguides are formed in the same plane but not parallel to each other.
    Type: Application
    Filed: March 13, 2006
    Publication date: July 27, 2006
    Applicant: Opnext Japan, Inc.
    Inventors: Hiroyuki Kamiyama, Kenji Uchida, Seiji Sumi
  • Patent number: 7011458
    Abstract: An optical module having: a first transmission line and a second transmission line, both connected in series to transmit electrical signals; a laser diode element; an optical modulator element; a termination resistance element for impedance matching; a first bonding wire connecting one end of the first transmission line and the optical modulator element; and a second bonding wire connecting the optical modulator element and the termination resistance element. The resistance value of the termination resistance element is set to stay in a range from 40 to 60 ?, the characteristic impedance of the second transmission line is set to 50 ?, and the characteristic impedance of the first transmission line is set to stay in a range from 20 to 30 ?.
    Type: Grant
    Filed: May 18, 2005
    Date of Patent: March 14, 2006
    Assignee: Opnext Japan, Inc.
    Inventors: Osamu Kagaya, Seiji Sumi, Hiroyuki Arima
  • Publication number: 20060008194
    Abstract: An optical module having: a first transmission line and a second transmission line, both connected in series to transmit electrical signals; a laser diode element; an optical modulator element; a termination resistance element for impedance matching; a first bonding wire connecting one end of the first transmission line and the optical modulator element; and a second bonding wire connecting the optical modulator element and the termination resistance element. The resistance value of the termination resistance element is set to stay in a range from 40 to 60 ?, the characteristic impedance of the second transmission line is set to 50 ?, and the characteristic impedance of the first transmission line is set to stay in a range from 20 to 30 ?.
    Type: Application
    Filed: May 18, 2005
    Publication date: January 12, 2006
    Inventors: Osamu Kagaya, Seiji Sumi, Hiroyuki Arima
  • Publication number: 20050275920
    Abstract: This invention provides an optical transmitter module and an optical module using an EA modulator capable of realizing stable ACER regardless of operating temperature without using a control mechanism for maintaining temperature of the EA modulator constant. In the EA modulator, optical waveguides formed of a multi-layered film are formed on a substrate, an electrical signal is applied to the optical waveguides in a direction vertical to the substrate, and the input light absorption amount is changed to control the amount of output light. Also, a plurality of p-side electrodes electrically separated from each other for applying an electrical signal to the active layer optical waveguides are arranged on optical axes of active layer optical waveguides. The length of optical waveguides to which the electrical signal is applied is changed by controlling the number of p-side electrodes to which the electrical signal is applied in accordance with temperature.
    Type: Application
    Filed: December 23, 2004
    Publication date: December 15, 2005
    Inventors: Seiji Sumi, Kazuhisa Uomi, Hiroyuki Kamiyama, Kazuhiko Naoe
  • Publication number: 20050025414
    Abstract: The present invention provides a polarization dependency-free, gain-saturated high function semiconductor optical amplifier and optical module at industrially low cost. The gist of the present invention is to structurally separate the optical signal propagating waveguide from another optical waveguide which serves as a lasing optical cavity for optical amplification in such a manner that the two optical waveguides are formed in the same plane but not parallel to each other.
    Type: Application
    Filed: May 20, 2004
    Publication date: February 3, 2005
    Applicant: Opnext Japan, Inc.
    Inventors: Hiroyuki Kamiyama, Kenji Uchida, Seiji Sumi