Patents by Inventor Norikazu Miyazaki

Norikazu Miyazaki 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: 20210373408
    Abstract: An optical waveguide device includes a substrate on which an optical waveguide is formed, and an object that is disposed on the substrate. The optical waveguide includes a mode conversion/branching portion that converts a mode of a light wave propagating through the optical waveguide and branches the light wave, and the object is disposed to cover a part or the whole of the mode conversion/branching portion or not to cover the mode conversion/branching portion when the substrate is viewed in a plan view. In a case where the object is disposed to cover a part of the mode conversion/branching portion, the object is disposed not to consecutively cover a section over a length of a predetermined value or higher in an advancing direction of a light wave.
    Type: Application
    Filed: August 11, 2021
    Publication date: December 2, 2021
    Applicant: Sumitomo Osaka Cement Co., Ltd.
    Inventors: Kei KATOU, Norikazu MIYAZAKI
  • Patent number: 11156857
    Abstract: An initial change and a secular change in an optical characteristic and a high frequency characteristic in a case where an optical modulator is mounted in a package of an optical transmission apparatus are suppressed while improving a space utilization rate in the package of the optical transmission apparatus. An optical modulator that is electrically connected to an electric circuit configured on a circuit board, includes a package that houses an optical modulation element, in which the package has, on a bottom surface facing the circuit board, a plurality of first protruding bodies protruding from the bottom surface.
    Type: Grant
    Filed: January 11, 2019
    Date of Patent: October 26, 2021
    Assignee: SUMITOMO OSAKA CEMENT CO., LTD.
    Inventors: Norikazu Miyazaki, Toru Sugamata
  • Publication number: 20210302679
    Abstract: An optical waveguide device includes a substrate on which an optical waveguide is formed, and a reinforcing block disposed on the substrate, along an end surface of the substrate on which an input portion or an output portion of the optical waveguide is disposed, in which an optical component that is joined to both the end surface of the substrate and an end surface of the reinforcing block is provided, a material used for a joining surface of the optical component and a material used for the substrate or the reinforcing block have at least different linear expansion coefficients of a direction parallel to the joining surface, and an area of a joining portion of the optical component is set to be smaller than an area of the end surfaces including joining portions of the substrate and the reinforcing block.
    Type: Application
    Filed: March 26, 2021
    Publication date: September 30, 2021
    Applicant: SUMITOMO OSAKA CEMENT CO., LTD.
    Inventors: Kei KATO, Hideki ICHIMEI, Norikazu MIYAZAKI
  • Publication number: 20210302765
    Abstract: An optical waveguide device includes a substrate on which an optical waveguide is formed, and a reinforcing block disposed on the substrate, along an end surface of the substrate on which an input portion or an output portion of the optical waveguide is disposed, in which an optical component that is joined to both the end surface of the substrate and an end surface of the reinforcing block is provided, a material used for a joining surface of the optical component and a material used for the substrate or the reinforcing block have at least different linear expansion coefficients of a direction parallel to the joining surface, and an area of the joining surface is set to be smaller than a maximum value of a total of areas of cross sections of the substrate and the reinforcing block parallel to the joining surface.
    Type: Application
    Filed: March 25, 2021
    Publication date: September 30, 2021
    Applicant: SUMITOMO OSAKA CEMENT CO., LTD.
    Inventors: Hideki ICHIMEI, Kei KATO, Norikazu MIYAZAKI
  • Publication number: 20210302674
    Abstract: An optical waveguide device includes: a substrate having an electro-optic effect, an optical waveguide formed on the substrate, a light-receiving element disposed on the substrate and monitoring a light wave propagating through the optical waveguide or a light wave that is radiated from the optical waveguide; and a monitoring optical waveguide extending from the optical waveguide to the light-receiving element, in which the monitoring optical waveguide has a U-turn waveguide with respect to an output direction of the optical waveguide, and the light-receiving element is disposed at a part of the monitoring optical waveguide after the U-turn waveguide.
    Type: Application
    Filed: March 29, 2021
    Publication date: September 30, 2021
    Applicant: SUMITOMO OSAKA CEMENT CO., LTD.
    Inventors: Norikazu MIYAZAKI, Yu NAKATA
  • Publication number: 20210294177
    Abstract: In an optical waveguide element which uses a rib type optical waveguide, light propagating in the rib type optical waveguide is monitored stably and accurately. The optical waveguide element includes a rib type optical waveguide provided on a optical waveguide substrate and configured of a convex portion protruding in a thickness direction of the optical waveguide substrate and extending in a plane direction of the optical waveguide substrate, and a light receiving element configured of a light receiving part formed on a light receiving element substrate disposed on the rib type optical waveguide and configured to receive at least a part of light propagating through the rib type optical waveguide, and the light receiving element substrate is supported by at least one first convex portion having the same height as that of the rib type optical waveguide provided on the optical waveguide substrate.
    Type: Application
    Filed: March 15, 2021
    Publication date: September 23, 2021
    Applicant: SUMITOMO OSAKA CEMENT CO., LTD.
    Inventors: Yu NAKATA, Norikazu MIYAZAKI
  • Publication number: 20210294040
    Abstract: An optical functional device includes a package case accommodating an optical functional element, an input optical fiber, and an output optical fiber. The optical functional device includes a first reflecting surface that reflects input light output from the input optical fiber to an optical path of output light, a second reflecting surface that reflects the input light to the optical functional element, and a third reflecting surface that reflects the output light in a direction in which the output light becomes further away from an optical axis of the input optical fiber. An optical axis of a leaked light beam transmitted through the second reflecting surface after being reflected by the first reflecting surface or an extension line of the optical axis in an optical propagation medium does not include a portion that is aligned with an optical axis of the output light reflected by the third reflecting surface.
    Type: Application
    Filed: February 12, 2021
    Publication date: September 23, 2021
    Inventors: Takeshi Sakai, Norikazu Miyazaki
  • Patent number: 11109480
    Abstract: A transmission line has a signal electrode formed on one surface of a flexible printed circuit, and a ground electrode formed on the other surface of the flexible printed circuit. A connection terminal has signal terminals formed on both the surfaces of the flexible printed circuit and electrically connected to each other through a via hole, and ground terminals formed on both the surfaces of the flexible printed circuit and electrically connected to each other through the via hole. The signal terminal on the surface, on which the ground electrode is formed, is formed such that at least a width in an end portion on the transmission line side is narrower than a width of a part of the signal terminal on the surface, on which the signal electrode is formed, to be at the same position when the flexible printed circuit is seen in a plan view.
    Type: Grant
    Filed: January 30, 2019
    Date of Patent: August 31, 2021
    Assignee: Sumitomo Osaka Cement Co., Ltd
    Inventors: Norikazu Miyazaki, Kei Katou, Toshio Kataoka
  • Patent number: 11099324
    Abstract: In the optical waveguide device including an unnecessary-light waveguide for guiding unnecessary light emitted from a main waveguide, an emission waveguide connected to the unnecessary-light waveguide to emit the unnecessary light propagating through the unnecessary-light waveguide to the outside of the substrate is formed; an effective refractive index of the emission waveguide is set to be higher than an effective refractive index of the unnecessary-light waveguide; in a connection portion between the unnecessary-light waveguide and the emission waveguide, a centerline of the emission waveguide is inclined in a direction away from the main waveguide with respect to a centerline of the unnecessary-light waveguide; furthermore, in the connection portion, a position of the centerline of the emission waveguide is disposed to be shifted to a position further away from the main waveguide with respect to a position of the centerline of the unnecessary-light waveguide.
    Type: Grant
    Filed: October 29, 2019
    Date of Patent: August 24, 2021
    Assignee: SUMITOMO OSAKA CEMENT CO., LTD.
    Inventors: Yu Kataoka, Norikazu Miyazaki
  • Patent number: 11029577
    Abstract: An optical modulator includes an optical modulation element having a plurality of signal electrodes; a housing that houses the optical modulation element; a plurality of signal input terminals each of which inputs an electrical signal to be applied to each of the signal electrodes; and a relay substrate on which a plurality of signal conductor patterns that electrically connect each of the signal input terminals to each of the signal electrodes, and a plurality of ground conductor patterns are formed, in which the relay substrate is housed in the housing, and at least one input side ground conductor pattern extending from at least one of the ground conductor patterns is formed on an input side surface having a side on which an electrical signal output from the signal input terminal is input to the signal conductor pattern as one side.
    Type: Grant
    Filed: October 28, 2019
    Date of Patent: June 8, 2021
    Assignee: SUMITOMO OSAKA CEMENT CO., LTD.
    Inventors: Norikazu Miyazaki, Toru Sugamata
  • Publication number: 20210157176
    Abstract: To suppress characteristic fluctuations and or the degradation of long-term reliability attributed to the disposition of a heat-generating electronic component close to an optical modulator.
    Type: Application
    Filed: June 28, 2019
    Publication date: May 27, 2021
    Inventors: Norikazu Miyazaki, Toru Sugamata
  • Publication number: 20210149268
    Abstract: An optical modulator has an optical modulation element including optical waveguides and a housing that accommodates the optical modulation element. The housing has a bottom surface wall having a quadrilateral shape in a plan view, first and second long side walls that are connected to two opposite edges of the bottom surface wall, and first and second short side walls, shorter than the long side walls, and connected to two other opposite edges of the bottom surface wall. The optical modulation element is accommodated in a space surrounded by the bottom surface wall and the side walls. The second long side wall has a wall thickness that is equal to or larger than that of the first long side wall, and at least one of the first and second short side walls has a wall thickness that is thinner than that of the first long side wall.
    Type: Application
    Filed: June 28, 2019
    Publication date: May 20, 2021
    Inventors: Norikazu Miyazaki, Toru Sugamata
  • Patent number: 10921620
    Abstract: An optical modulator includes an optical modulation element (102) including a plurality of signal electrodes (112a and the like), a plurality of lead pins (116a and the like) for inputting high frequency signals, and a relay substrate (118) in which conductor patterns (202a and the like) that electrically connect the lead pins and the signal electrodes are formed, and at least one of the conductor patterns in the optical modulator is constituted so that at least one resonant frequency of the at least one of the conductor patterns is different from at least one resonant frequency of at least one of the other conductor patterns.
    Type: Grant
    Filed: September 29, 2017
    Date of Patent: February 16, 2021
    Assignee: SUMITOMO OSAKA CEMENT CO., LTD.
    Inventors: Toru Sugamata, Norikazu Miyazaki
  • Publication number: 20210026217
    Abstract: An optical modulator that can effectively dissipate heat generated from the inside includes: an optical modulation element which includes an optical ave aide and a radio frequency electrode for controlling light waves propagating through the optical waveguide; a termination resistor electrically connected to the radio frequency electrode; a termination resistor board on which the termination resistor is disposed; and a package case, which houses the optical modulation element and the termination resistor board, in which a plurality of protrusion portions are formed on one external surface of the package case, and at least one of the protrusion portions is formed at a position on the external surface of the package case, which faces a position inside the package case where the termination resistor board is disposed with the package case in between.
    Type: Application
    Filed: February 1, 2019
    Publication date: January 28, 2021
    Inventors: Norikazu Miyazaki, Toru Sugamata
  • Publication number: 20200409230
    Abstract: In an optical modulator, high frequency characteristics are improved and the stability thereof is improved. An optical modulator includes: an optical element substrate that includes an optical waveguide and a plurality of electrodes that control light waves propagating through the optical waveguide; and a package case that houses the optical element substrate, in which a plurality of signal input terminals, respectively electrically connected to the plurality of electrodes, are provided on the bottom surface of the package case, and the plurality of signal input terminals respectively electrically connected to the plurality of electrodes provided on the optical element substrate are divided and disposed on the sides facing each other with the optical element substrate interposed therebetween.
    Type: Application
    Filed: January 23, 2019
    Publication date: December 31, 2020
    Inventors: Norikazu Miyazaki, Toru Sugamata
  • Patent number: 10871664
    Abstract: An optical modulator includes an optical waveguide formed on a substrate and modulates a light wave propagating through the optical waveguide, in which the optical waveguide has a configuration in which a plurality of branching parts are connected to each other in multiple stages, each of branched waveguides branched from a branch point of a first branching part among the plurality of branching parts has a transition curve of which a curvature changes, in a predetermined section from the branch point, each of the branched waveguides is formed by the transition curve starting from a curvature of 0, and a curvature change and a width change of the optical waveguide are set to be symmetric between the branched waveguides, and second branching parts formed in the respective branched waveguides are disposed at different positions between the branched waveguides in a direction along a propagation axis of the optical waveguide.
    Type: Grant
    Filed: July 29, 2019
    Date of Patent: December 22, 2020
    Assignee: Sumitomo Osaka Cement Co., Ltd.
    Inventors: Norikazu Miyazaki, Yuu Kataoka
  • Publication number: 20200379279
    Abstract: An initial change and a secular change in an optical characteristic and a high frequency characteristic in a case where an optical modulator is mounted in a package of an optical transmission apparatus are suppressed while improving a space utilization rate in the package of the optical transmission apparatus. An optical modulator that is electrically connected to an electric circuit configured on a circuit board, includes: a package that houses an optical modulation element; and a signal input part or the like for inputting an electric signal for causing the optical modulation element to perform an modulation operation from the electric circuit, in which the package has, on a part of a bottom surface facing the circuit board, a first protrusion portion protruding from the bottom surface, and the signal input part is provided on an upper surface of the first protrusion portion.
    Type: Application
    Filed: January 11, 2019
    Publication date: December 3, 2020
    Inventors: Norikazu MIYAZAKI, Toru SUGAMATA
  • Publication number: 20200379278
    Abstract: An initial change and a secular change in an optical characteristic and a high frequency characteristic in a case where an optical modulator is mounted in a package of an optical transmission apparatus are suppressed while improving a space utilization rate in the package of the optical transmission apparatus. An optical modulator that is electrically connected to an electric circuit configured on a circuit board, includes a package that houses an optical modulation element, in which the package has, on a bottom surface facing the circuit board, a plurality of first protruding bodies protruding from the bottom surface.
    Type: Application
    Filed: January 11, 2019
    Publication date: December 3, 2020
    Inventors: Norikazu Miyazaki, Toru Sugamata
  • Patent number: 10845539
    Abstract: An optical modulator capable of curbing deterioration of transmission properties due to deformation of a housing is provided. Provided is an optical modulator including a substrate (10) on which an optical waveguide (20) is formed and a housing (30) that accommodates the substrate, in which the optical waveguide includes mode conversion branching portions (21, 22) which convert a mode of light waves propagating through the optical waveguide and branch the light waves, a mounting portion (32) protruding from a surface (31) inside the housing and holding the substrate is formed, and the substrate is fixed to the mounting portion in an arrangement in which a fixed end (33) between the substrate and the mounting portion is positioned outside a region including the mode conversion branching portions when the substrate is seen in a plan view.
    Type: Grant
    Filed: March 4, 2019
    Date of Patent: November 24, 2020
    Assignee: SUMITOMO OSAKA CEMENT CO., LTD.
    Inventors: Kei Kato, Norikazu Miyazaki
  • Publication number: 20200310218
    Abstract: An optical modulator includes an optical modulation element having a plurality of signal electrodes; a plurality of signal input terminals each of which inputs an electrical signal to be applied to each signal electrode; a relay substrate on which a plurality of signal conductor patterns electrically connecting the signal input terminals and the signal electrodes, and a plurality of ground conductor patterns are formed; and a housing that houses the optical modulation element and the relay substrate, in which the relay substrate has at least one groove extending from the signal input side on which the signal input terminal is connected to the signal conductor pattern, in at least one ground conductor pattern formed between adjacent signal conductor patterns, and the groove is formed such that a length extending from the signal input side is longer than a length of the signal input terminal extending on the signal conductor pattern.
    Type: Application
    Filed: October 28, 2019
    Publication date: October 1, 2020
    Inventors: Norikazu Miyazaki, Toru Sugamata