Patents by Inventor Tetsuya Ejiri

Tetsuya Ejiri 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: 11674652
    Abstract: A phosphor element includes an incident face for an excitation light, a reflecting face opposing the incident face and a side face, and the phosphor element converts at least a part of the excitation light incident onto the incident face into a fluorescence and emits the fluorescence from the incident face. The incident face has an area greater that an area of the reflecting face. The phosphor element includes an inclination region in which an inclination angle of the side face with respect to a vertical axis perpendicular to the incident face is monotonously increased from the reflecting face toward the incident face, viewed in a cross-section perpendicular to the incident face and along the longest dividing line halving the incident face.
    Type: Grant
    Filed: May 18, 2022
    Date of Patent: June 13, 2023
    Assignee: NGK INSULATORS, LTD.
    Inventors: Jungo Kondo, Naotake Okada, Shoichiro Yamaguchi, Tetsuya Ejiri, Yuichi Iwata
  • Patent number: 11561333
    Abstract: A white light generating device, for generating white light from an excitation light of a laser light having a wavelength of from 280 nm-495 nm, includes a fluorescent body generating a fluorescence having a wavelength longer than a wavelength of the excitation light. The fluorescent body includes an emission-side end surface emitting excitation light and fluorescence, an opposing end surface on an opposite side of the emission-side end surface, and an outer peripheral surface. The emission-side end surface has an area larger than an area of the opposing end surface, and the outer peripheral surface of the fluorescent body includes a part inclined with respect to a central axis of the fluorescent body by from 3.4°-23° over an entire periphery of the fluorescent body. The emission-side end surface has an area of from 0.3 mm2-1.52 mm2.
    Type: Grant
    Filed: August 14, 2020
    Date of Patent: January 24, 2023
    Assignee: NGK INSULATORS, LTD.
    Inventors: Jungo Kondo, Yuichi Iwata, Tetsuya Ejiri
  • Patent number: 11525950
    Abstract: A white light generating device, for generating white light from an excitation light of a laser light having a wavelength of from 280 nm-495 nm, includes a fluorescent body generating a fluorescence having a wavelength longer than a wavelength of the excitation light. The fluorescent body includes an emission-side end surface emitting excitation light and fluorescence, an opposing end surface on an opposite side of the emission-side end surface, and an outer peripheral surface. The emission-side end surface has an area larger than an area of the opposing end surface, and the outer peripheral surface of the fluorescent body includes a part inclined with respect to a central axis of the fluorescent body by from 3.4°-23° over an entire periphery of the fluorescent body. The emission-side end surface has an area of from 0.3 mm2-1.52 mm2.
    Type: Grant
    Filed: August 14, 2020
    Date of Patent: December 13, 2022
    Assignee: NGK INSULATORS, LTD.
    Inventors: Jungo Kondo, Yuichi Iwata, Tetsuya Ejiri
  • Publication number: 20220278506
    Abstract: A phosphor element includes an incident face for an excitation light, an emitting face opposing the incident face and a side face, and the element converts at least a part of the incident excitation light incident onto the incident face to fluorescence and emits the fluorescence from the emitting face. The emitting face has an area larger than an area of the incident face. The phosphor element comprises an inclination region in which an inclination angle of the side face with respect to a vertical axis perpendicular to the emitting face is monotonously increased from the incident face toward the emitting face, viewed in a cross-section perpendicular to the emitting face and along the longest dividing line halving the emitting face.
    Type: Application
    Filed: May 18, 2022
    Publication date: September 1, 2022
    Applicant: NGK Insulators, Ltd.
    Inventors: Jungo KONDO, Naotake OKADA, Shoichiro YAMAGUCHI, Tetsuya EJIRI, Yuichi IWATA
  • Publication number: 20220275919
    Abstract: A phosphor element includes an incident face for an excitation light, a reflecting face opposing the incident face and a side face, and the phosphor element converts at least a part of the excitation light incident onto the incident face into a fluorescence and emits the fluorescence from the incident face. The incident face has an area greater that an area of the reflecting face. The phosphor element includes an inclination region in which an inclination angle of the side face with respect to a vertical axis perpendicular to the incident face is monotonously increased from the reflecting face toward the incident face, viewed in a cross-section perpendicular to the incident face and along the longest dividing line halving the incident face.
    Type: Application
    Filed: May 18, 2022
    Publication date: September 1, 2022
    Applicant: NGK Insulators, Ltd.
    Inventors: Jungo KONDO, Naotake OKADA, Shoichiro YAMAGUCHI, Tetsuya EJIRI, Yuichi IWATA
  • Patent number: 11385334
    Abstract: An optical scanning device includes a supporting body 2; an optical waveguide composed of a single crystal having electro-optic effect and integrated with the supporting body directly or through a clad layer; a plurality of periodic domain inversion parts formed in the optical waveguide, the periodic domain inversion parts having periods different from each other; and a plurality of electrodes capable of applying voltages on the periodic domain inversion parts, respectively, to generate diffraction gratings in the periodic domain inversion parts, respectively. The clad layer is composed of a material having a refractive index lower than a refractive index of the single crystal forming the optical waveguide.
    Type: Grant
    Filed: January 2, 2019
    Date of Patent: July 12, 2022
    Assignee: NGK Insulators, Ltd.
    Inventors: Jungo Kondo, Naotake Okada, Tetsuya Ejiri, Keiichiro Asai, Shoichiro Yamaguchi
  • Patent number: 10859747
    Abstract: A phosphor element comprises: a support substrate; an optical waveguide for propagating an excitation light through the waveguide, the optical waveguide comprising a phosphor generating a fluorescence, and the optical waveguide comprising an emission side end surface emitting the excitation light and the fluorescence, an opposing end surface opposing the emission side end surface, a bottom surface, a top surface opposing the bottom surface and a pair of side surfaces; a bottom surface side clad layer covering the bottom surface of the optical waveguide; a top surface side clad layer covering the top surface of the optical waveguide; side surface side clad layers covering the side surfaces of the optical waveguide, respectively; a top surface side reflection film covering the top surface side clad layer; side surface side reflection films covering the side surface side clad layers, respectively; and a bottom surface side reflection film provided between the support substrate and the bottom surface side clad la
    Type: Grant
    Filed: June 13, 2019
    Date of Patent: December 8, 2020
    Assignee: NGK Insulators, Ltd.
    Inventors: Jungo Kondo, Naotake Okada, Shoichiro Yamaguchi, Keiichiro Asai, Shuhei Higashihara, Yuichi Iwata, Tetsuya Ejiri, Akira Hamajima
  • Publication number: 20200371278
    Abstract: A white light generating device, for generating white light from an excitation light of a laser light having a wavelength of 280 nm or longer and 495 nm or shorter, includes a fluorescent body generating a fluorescence having a wavelength longer than a wavelength of the excitation light. The fluorescent body includes an emission-side end surface emitting excitation light and fluorescence, an opposing end surface on an opposite side of the emission-side end surface, and an outer peripheral surface. The emission-side end surface has an area larger than an area of the opposing end surface, and the outer peripheral surface of the fluorescent body includes a part inclined with respect to a central axis of the fluorescent body by 3.4° or larger and 23° or smaller over an entire periphery of the fluorescent body. The emission-side end surface has an area of 0.3=2 or larger and 1.52=2 or smaller.
    Type: Application
    Filed: August 14, 2020
    Publication date: November 26, 2020
    Inventors: Jungo KONDO, Yuichi IWATA, Tetsuya EJIRI
  • Publication number: 20190310408
    Abstract: A phosphor element comprises: a support substrate; an optical waveguide for propagating an excitation light through the waveguide, the optical waveguide comprising a phosphor generating a fluorescence, and the optical waveguide comprising an emission side end surface emitting the excitation light and the fluorescence, an opposing end surface opposing the emission side end surface, a bottom surface, a top surface opposing the bottom surface and a pair of side surfaces; a bottom surface side clad layer covering the bottom surface of the optical waveguide; a top surface side clad layer covering the top surface of the optical waveguide; side surface side clad layers covering the side surfaces of the optical waveguide, respectively; a top surface side reflection film covering the top surface side clad layer; side surface side reflection films covering the side surface side clad layers, respectively; and a bottom surface side reflection film provided between the support substrate and the bottom surface side clad la
    Type: Application
    Filed: June 13, 2019
    Publication date: October 10, 2019
    Applicant: NGK INSULATORS, LTD.
    Inventors: Jungo KONDO, Naotake OKADA, Shoichiro YAMAGUCHI, Keiichiro ASAI, Shuhei HIGASHIHARA, Yuichi Iwata, Tetsuya Ejiri, Akira Hamajima
  • Publication number: 20190154811
    Abstract: An optical scanning device includes a supporting body 2; an optical waveguide composed of a single crystal having electro-optic effect and integrated with the supporting body directly or through a clad layer; a plurality of periodic domain inversion parts formed in the optical waveguide, the periodic domain inversion parts having periods different from each other; and a plurality of electrodes capable of applying voltages on the periodic domain inversion parts, respectively, to generate diffraction gratings in the periodic domain inversion parts, respectively. The clad layer is composed of a material having a refractive index lower than a refractive index of the single crystal forming the optical waveguide.
    Type: Application
    Filed: January 2, 2019
    Publication date: May 23, 2019
    Applicant: NGK INSULATORS, LTD.
    Inventors: Jungo KONDO, Naotake OKADA, Tetsuya EJIRI, Keiichiro ASAI, Shoichiro YAMAGUCHI
  • Patent number: 10074962
    Abstract: A grating element includes: a support substrate; an optical material layer; a ridge optical waveguide having an incidence surface on which a laser light is incident and an emission end from which an emission light with a desired wavelength is emitted; and a Bragg grating including concave and convex portions formed within the optical waveguide. The optical waveguide includes an incident portion between the incidence surface and the Bragg grating, and a tapered portion between the incident portion and the Bragg grating. In the Bragg grating, a propagation light propagates in single mode. The width Win of the optical waveguide in the incident portion is larger than the width Wgr of the optical waveguide in the Bragg grating. The width Wt of the optical waveguide in the tapered portion is decreased from the incident portion toward the Bragg grating. The relationships represented by formulas (1) to (3) are satisfied.
    Type: Grant
    Filed: October 25, 2016
    Date of Patent: September 11, 2018
    Assignee: NGK Insulators, Ltd.
    Inventors: Jungo Kondo, Shoichiro Yamaguchi, Keiichiro Asai, Tetsuya Ejiri, Naotake Okada
  • Patent number: 10003175
    Abstract: An external resonator type light-emitting device includes a light source oscillating a semiconductor laser light and a grating element configuring an external resonator together with the light source. The light source includes an active layer oscillating the semiconductor laser light. The grating element includes an optical waveguide and a plurality of Bragg gratings formed in the optical waveguide. The optical waveguide includes an incident face on which the semiconductor laser light is incident and an emitting face from which an emitting light having a desired wavelength is emitted.
    Type: Grant
    Filed: December 12, 2016
    Date of Patent: June 19, 2018
    Assignee: NGK Insulators, Ltd.
    Inventors: Jungo Kondo, Shoichiro Yamaguchi, Tetsuya Ejiri
  • Patent number: 9979157
    Abstract: An external resonator type light-emitting device includes a light source oscillating a semiconductor laser light and a grating element configuring an external resonator together with the light source. The light source includes an active layer oscillating said semiconductor laser light. The grating element includes an optical waveguide and a plurality of Bragg gratings formed in the optical waveguide. The optical waveguide includes an incident face to which the semiconductor laser light is incident and an emitting face from which an emitting light having a desired wavelength is emitted. A half value reflectance R50 is larger than a reflectance R2 at an emitting end of the light source. A half value reflectance R50 is 3% or larger. A combined reflectance is not less than the half value reflectance R50 in a wavelength region ??50.
    Type: Grant
    Filed: December 12, 2016
    Date of Patent: May 22, 2018
    Assignee: NGK Insulators, Ltd.
    Inventors: Jungo Kondo, Shoichiro Yamaguchi, Tetsuya Ejiri
  • Patent number: 9874694
    Abstract: A plurality of Bragg gratings are formed at predetermined locations of a laminate including a mounting substrate, a clad layer provided on the mounting substrate and an optical material layer provided on the clad layer. Optical waveguides are formed each including at least each of the Bragg gratings. Masks are formed each covering a region corresponding to each of the grating elements on the optical material layer. The optical material layer and clad layer are etched to shape an end face of each of the grating elements.
    Type: Grant
    Filed: October 12, 2016
    Date of Patent: January 23, 2018
    Assignee: NGK Insulators, Ltd.
    Inventors: Keiichiro Asai, Shoichiro Yamaguchi, Jungo Kondo, Naotake Okada, Tetsuya Ejiri
  • Patent number: 9859684
    Abstract: A grating device includes a support substrate, an optical material layer 11 disposed on the support substrate and having a thickness of 0.5 ?m or more and 3.0 ?m or less, a ridge optical waveguide formed by a pair of ridge grooves in the optical material layer and having a light-receiving surface for receiving a semiconductor laser light and a light-emitting surface for emitting light having a desired wavelength, a Bragg grating 12 comprising convexes and concaves formed in the ridge optical waveguide, and a propagating portion 13 disposed between the light-receiving surface and the Bragg grating. The relationships represented by the following Formulas (1) to (4) are satisfied: 0.8 nm???G?6.0 nm??(1); 10 ?m?Lb?300 ?m??(2); 20 nm?td?250 nm??(3); and nb?1.8??(4).
    Type: Grant
    Filed: May 24, 2016
    Date of Patent: January 2, 2018
    Assignee: NGK INSULATORS, LTD.
    Inventors: Jungo Kondo, Shoichiro Yamaguchi, Tetsuya Ejiri, Keiichiro Asai, Naotake Okada
  • Publication number: 20170093126
    Abstract: An external resonator type light-emitting device includes a light source oscillating a semiconductor laser light and a grating element configuring an external resonator together with the light source. The light source includes an active layer oscillating the semiconductor laser light. The grating element includes an optical waveguide and a plurality of Bragg gratings formed in the optical waveguide. The optical waveguide includes an incident face on which the semiconductor laser light is incident and an emitting face from which an emitting light having a desired wavelength is emitted.
    Type: Application
    Filed: December 12, 2016
    Publication date: March 30, 2017
    Applicant: NGK INSULATORS, LTD.
    Inventors: Jungo KONDO, Shoichiro YAMAGUCHI, Tetsuya EJIRI
  • Publication number: 20170093127
    Abstract: An external resonator type light-emitting device includes a light source oscillating a semiconductor laser light and a grating element configuring an external resonator together with the light source. The light source includes an active layer oscillating said semiconductor laser light. The grating element includes an optical waveguide and a plurality of Bragg gratings formed in the optical waveguide. The optical waveguide includes an incident face to which the semiconductor laser light is incident and an emitting face from which an emitting light having a desired wavelength is emitted. A half value reflectance R50 is larger than a reflectance R2 at an emitting end of the light source. A half value reflectance R50 is 3% or larger. A combined reflectance is not less than the half value reflectance R50 in a wavelength region ??50.
    Type: Application
    Filed: December 12, 2016
    Publication date: March 30, 2017
    Applicant: NGK INSULATORS, LTD.
    Inventors: Jungo KONDO, Shoichiro YAMAGUCHI, Tetsuya EJIRI
  • Patent number: 9574933
    Abstract: Provided a terahertz-wave detection element with high spatial resolution and suppressing a crack occurrence. A method of manufacturing the detection element capable of detecting a spatial intensity distribution of a terahertz wave includes: a step of forming an oxide layer on one main surface of a first substrate consisting of an electro-optic crystal; a step of joining the one main surface of the first substrate and a second substrate by an adhesive consisting; a step of thinning the first substrate of a joined body, to a thickness of 1-30 ?m by polishing the first substrate; and a step of obtaining a large number of terahertz-wave detection elements by cutting the joined body. The oxide layer is formed such that the first substrate becomes convex to a side of the one main surface by causing a tensile stress to act on it.
    Type: Grant
    Filed: March 23, 2015
    Date of Patent: February 21, 2017
    Assignee: NGK INSULATORS, LTD.
    Inventors: Jungo Kondo, Yuichi Iwata, Tetsuya Ejiri
  • Publication number: 20170047711
    Abstract: A grating element includes: a support substrate; an optical material layer; a ridge optical waveguide having an incidence surface on which a laser light is incident and an emission end from which an emission light with a desired wavelength is emitted; and a Bragg grating including concave and convex portions formed within the optical waveguide. The optical waveguide includes an incident portion between the incidence surface and the Bragg grating, and a tapered portion between the incident portion and the Bragg grating. In the Bragg grating, a propagation light propagates in single mode. The width Win of the optical waveguide in the incident portion is larger than the width Wgr of the optical waveguide in the Bragg grating. The width Wt of the optical waveguide in the tapered portion is decreased from the incident portion toward the Bragg grating. The relationships represented by formulas (1) to (3) are satisfied.
    Type: Application
    Filed: October 25, 2016
    Publication date: February 16, 2017
    Applicant: NGK INSULATORS, LTD.
    Inventors: Jungo KONDO, Shoichiro YAMAGUCHI, Keiichiro ASAI, Tetsuya EJIRI, Naotake OKADA
  • Publication number: 20170031097
    Abstract: A plurality of Bragg gratings are formed at predetermined locations of a laminate including a mounting substrate, a clad layer provided on the mounting substrate and an optical material layer provided on the clad layer. Optical waveguides are formed each including at least each of the Bragg gratings. Masks are formed each covering a region corresponding to each of the grating elements on the optical material layer. The optical material layer and clad layer are etched to shape an end face of each of the grating elements.
    Type: Application
    Filed: October 12, 2016
    Publication date: February 2, 2017
    Applicant: NGK INSULATORS, LTD.
    Inventors: Keiichiro ASAI, Shoichiro YAMAGUCHI, Jungo KONDO, Naotake OKADA, Tetsuya EJIRI