Patents by Inventor Makiko IWASA

Makiko IWASA 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: 11677050
    Abstract: A light emitting device includes a light emitting element having a dominant wavelength in a range of 400 nm or more and 500 nm or less, and a wavelength conversion member that is arranged on a light emitting side of the light emitting element and includes a rare earth aluminate fluorescent material having a composition represented by the following formula (I), wherein the light emitting device emits light having a dominant wavelength in a range of 475 nm or more and 500 nm or less, and wherein the light emitting device emits light having an S/P ratio of 6.5 or less derived from the formula (1), which is the ratio of a luminous flux in scotopic vision relative to a luminous flux in photopic vision: (Lu1-p-nLnpCen)3(Al1-mGam)5kO12??(I) wherein in the formula (I), Ln represents at least one rare earth element selected from the group consisting of Y, La, Gd, and Tb, and the parameters k, m, n, and p satisfy 0.95?k?1.05, 0.05?m?0.70, 0.002?n?0.050, and 0?p?0.30, respectively.
    Type: Grant
    Filed: May 27, 2021
    Date of Patent: June 13, 2023
    Assignee: NICHIA CORPORATION
    Inventors: Makiko Iwasa, Kazuya Nishimata, Atsushi Yoshinari, Shoji Hosokawa, Masato Okawa, Yasuaki Mashima
  • Publication number: 20230155084
    Abstract: A light-emitting device includes a substrate, a wiring, a light-emitting element configured to emit light having a main wavelength in a range from 500 nm to 560 nm, and a diffusion member. When chromaticity x and chromaticity y of an emission color of the light-emitting device are measured in each of first and second measurement planes in a range in which an angle at the center of the outer shape is in a range from ±60° with reference to a perpendicular line passing through the center of the diffusion member, an average value ? of a difference between a maximum value and a minimum value of a chromaticity difference ?x of the chromaticity x measured in the first measurement plane and a difference between a maximum value and a minimum value of a chromaticity difference ?x of the chromaticity x measured in the second measurement plane is less than 0.0024.
    Type: Application
    Filed: October 31, 2022
    Publication date: May 18, 2023
    Inventors: Masami KUMANO, Takahiro KUBO, Makiko IWASA
  • Publication number: 20230109952
    Abstract: Provided is a light-emitting device having a high luminous flux. The light-emitting device comprises a light-emitting element 11 that has a dominant wavelength in a range of 380 nm or more and 485 nm or less, and a fluorescent material layer 31 that includes a fluorescent material emitting light by being excited by light emitted from the light-emitting element 11, and a neodymium compound, wherein the light-emitting device emits light having a dominant wavelength in a range of 584 nm or more and 780 nm or less.
    Type: Application
    Filed: February 10, 2021
    Publication date: April 13, 2023
    Applicant: NICHIA CORPORATION
    Inventors: Makiko IWASA, Yuji SATO
  • Publication number: 20230045870
    Abstract: Provided is a light emitting device that is bright in both scotopic vision and photopic vision, and has reduced glare for humans. The light emitting device includes a light emitting element having a dominant wavelength in a range of 430 nm or more and 500 nm or less, and a fluorescent material that is excited by light emitted from the light emitting element and has a light emission peak wavelength in a range of 507 nm or more and 660 nm or less, wherein the light emitting device emits light having a dominant wavelength in a range of 490 nm or more and 500 nm or less, wherein the light emitting device has an S/P ratio, which is the ratio of a luminous flux in photopic vision to a luminous flux in scotopic vision, being 6.5 or less, and wherein the light emitting device has a light emission intensity in the light emission peak wavelength of the light emitting element that is greater than that in the light emission peak wavelength of the fluorescent material.
    Type: Application
    Filed: October 23, 2020
    Publication date: February 16, 2023
    Applicant: NICHIA CORPORATION
    Inventors: Makiko IWASA, Yuji SATO
  • Publication number: 20230019657
    Abstract: A light emitting device includes a light emitting element having an emission peak wavelength in a range of 380 nm to 420 nm and a fluorescent member including at least one fluorescent material that is excited by light from the light emitting element for light emission, wherein a mixture of light from the light emitting element and light from the fluorescent material has a correlated color temperature in a range of 2000 K to 7500 K as measured according to JIS Z8725, and the light emitting device has a spectral distribution in which, when the integral value over a wavelength range of 380 nm to 780 nm is normalized to 100%, the proportion of an integral value over a wavelength range of 380 nm to 420 nm is 15% or more, and the ratio a as defined by the expression (1) is 0.9 or more and 1.6 or less.
    Type: Application
    Filed: September 6, 2022
    Publication date: January 19, 2023
    Applicant: NICHIA CORPORATION
    Inventors: Makiko IWASA, Kazushige FUJIO
  • Patent number: 11502226
    Abstract: A light emitting device includes a light emitting element having an emission peak wavelength in a range of 380 nm to 420 nm and a fluorescent member including at least one fluorescent material that is excited by light from the light emitting element for light emission, wherein a mixture of light from the light emitting element and light from the fluorescent material has a correlated color temperature in a range of 2000 K to 7500 K as measured according to JIS Z8725, and the light emitting device has a spectral distribution in which, when the integral value over a wavelength range of 380 nm to 780 nm is normalized to 100%, the proportion of an integral value over a wavelength range of 380 nm to 420 nm is 15% or more, and the ratio a as defined by the expression (1) is 0.9 or more and 1.6 or less.
    Type: Grant
    Filed: August 3, 2020
    Date of Patent: November 15, 2022
    Assignee: NICHIA CORPORATION
    Inventors: Makiko Iwasa, Kazushige Fujio
  • Patent number: 11489094
    Abstract: A light emitting device includes: a light emitting element having a light emission peak wavelength in a range of 380 nm or more and 485 nm or less; a wavelength conversion member including a fluorescent material layer disposed on a light emission side of the light emitting element and containing a fluorescent material having a reflectance to light having a wavelength of 450 nm of 10% or less and a light emission peak wavelength in a range of 610 nm or more and 780 nm or less, and a dielectric multilayer film disposed on a light emission side of the fluorescent material layer.
    Type: Grant
    Filed: September 24, 2020
    Date of Patent: November 1, 2022
    Assignee: NICHIA CORPORATION
    Inventors: Makiko Iwasa, Yuji Sato, Miyuki Kurata
  • Patent number: 11313536
    Abstract: A light emitting device includes: a light emitting element having a dominant wavelength in a range greater than or equal to 380 nm and less than or equal to 470 nm; a wavelength conversion member that is disposed on the light emitting element and includes: a translucent member, and a first fluorescent material layer interposed between the light emitting element and the translucent material, the first fluorescent material layer comprising a resin that contains a first fluorescent material, and the first fluorescent material comprising at least one compound selected from (Ca, Sr)AlSiN3: Eu and (Ca, Sr, Ba)2Si5N8: Eu; and a covering member that covers sides of the wavelength conversion member and surrounds the light emitting element, the covering member comprising light reflecting material and a second fluorescent material, and the second fluorescent material comprising at least one compound selected from (Ca, Sr)AlSiN3: Eu and (Ca, Sr, Ba)2Si5N8: Eu.
    Type: Grant
    Filed: April 12, 2021
    Date of Patent: April 26, 2022
    Assignee: NICHIA CORPORATION
    Inventors: Makiko Iwasa, Yuji Sato, Hiroki Fukuta
  • Publication number: 20210376201
    Abstract: A light emitting device includes a light emitting element having a dominant wavelength in a range of 400 nm or more and 500 nm or less, and a wavelength conversion member that is arranged on a light emitting side of the light emitting element and includes a rare earth aluminate fluorescent material having a composition represented by the following formula (I), wherein the light emitting device emits light having a dominant wavelength in a range of 475 nm or more and 500 nm or less, and wherein the light emitting device emits light having an S/P ratio of 6.5 or less derived from the formula (1), which is the ratio of a luminous flux in scotopic vision relative to a luminous flux in photopic vision: (Lu1-p-nLnpCen)3(Al1-mGam)5kO12??(I) wherein in the formula (I), Ln represents at least one rare earth element selected from the group consisting of Y, La, Gd, and Tb, and the parameters k, m, n, and p satisfy 0.95?k?1.05, 0.05?m?0.70, 0.002?n?0.050, and 0?p?0.30, respectively.
    Type: Application
    Filed: May 27, 2021
    Publication date: December 2, 2021
    Applicant: NICHIA CORPORATION
    Inventors: Makiko IWASA, Kazuya NISHIMATA, Atsushi YOSHINARI, Shoji HOSOKAWA, Masato OKAWA, Yasuaki MASHIMA
  • Publication number: 20210305469
    Abstract: A wavelength conversion member includes: a light-transmissive member; and a wavelength conversion material located on a surface of the light-transmissive member and including: a resin, a phosphor with a median particle diameter of 10 ?m or more and 30 ?m or less, wherein an amount of the phosphor in the wavelength conversion material is 165 parts by mass or more and 400 parts by mass or less relative to 100 parts by mass of the resin, and a filler with a median particle diameter of 5 ?m or more and 40 ?m or less, wherein an amount of the filler in the wavelength conversion material is 5 parts by mass or more and 90 parts by mass or less relative to 100 parts by mass of the resin. A mixture volume ratio of the phosphor and the filler to the resin is 0.5 or more and 1.0 or less.
    Type: Application
    Filed: March 30, 2021
    Publication date: September 30, 2021
    Applicant: NICHIA CORPORATION
    Inventors: Eri MATSUKA, Makiko IWASA
  • Publication number: 20210231293
    Abstract: A light emitting device includes: a light emitting element having a dominant wavelength in a range greater than or equal to 380 nm and less than or equal to 470 nm; a wavelength conversion member that is disposed on the light emitting element and includes: a translucent member, and a first fluorescent material layer interposed between the light emitting element and the translucent material, the first fluorescent material layer comprising a resin that contains a first fluorescent material, and the first fluorescent material comprising at least one compound selected from (Ca, Sr)AlSiN3: Eu and (Ca, Sr, Ba)2Si5N8: Eu; and a covering member that covers sides of the wavelength conversion member and surrounds the light emitting element, the covering member comprising light reflecting material and a second fluorescent material, and the second fluorescent material comprising at least one compound selected from (Ca, Sr)AlSiN3: Eu and (Ca, Sr, Ba)2Si5N8: Eu.
    Type: Application
    Filed: April 12, 2021
    Publication date: July 29, 2021
    Applicant: NICHIA CORPORATION
    Inventors: Makiko IWASA, Yuji SATO, Hiroki FUKUTA
  • Patent number: 11002427
    Abstract: A light emitting device has a covering member. The covering member includes light reflecting material and a second fluorescent material, and a dominant wavelength of an emission spectrum of the second fluorescent material differs from a dominant wavelength of an emission spectrum of the light emitting device by 30 nm or less. The light emitting device emits light with chromaticity that is within a four-sided region on a CIE 1931 chromaticity diagram, where chromaticity coordinates (x, y) are (0.645, 0.335) at a first point, (0.665, 0.335) at a second point, (0.735, 0.265) at a third point, (0.721, 0.259) at a fourth point, and a first line joins the first and second points, a second line joins the second and third points, a third line joins the third and fourth points, and a fourth line joins the fourth and first points to define the four-sided region of the chromaticity diagram.
    Type: Grant
    Filed: March 26, 2020
    Date of Patent: May 11, 2021
    Assignee: NICHIA CORPORATION
    Inventors: Makiko Iwasa, Yuji Sato, Hiroki Fukuta
  • Publication number: 20210098659
    Abstract: A light emitting device includes: a light emitting element having a light emission peak wavelength in a range of 380 nm or more and 485 nm or less; a wavelength conversion member including a fluorescent material layer disposed on a light emission side of the light emitting element and containing a fluorescent material having a reflectance to light having a wavelength of 450 nm of 10% or less and a light emission peak wavelength in a range of 610 nm or more and 780 nm or less, and a dielectric multilayer film disposed on a light emission side of the fluorescent material layer.
    Type: Application
    Filed: September 24, 2020
    Publication date: April 1, 2021
    Applicant: NICHIA CORPORATION
    Inventors: Makiko IWASA, Yuji SATO, Miyuki KURATA
  • Publication number: 20200365772
    Abstract: A light emitting device includes a light emitting element having an emission peak wavelength in a range of 380 nm to 420 nm and a fluorescent member including at least one fluorescent material that is excited by light from the light emitting element for light emission, wherein a mixture of light from the light emitting element and light from the fluorescent material has a correlated color temperature in a range of 2000 K to 7500 K as measured according to JIS Z8725, and the light emitting device has a spectral distribution in which, when the integral value over a wavelength range of 380 nm to 780 nm is normalized to 100%, the proportion of an integral value over a wavelength range of 380 nm to 420 nm is 15% or more, and the ratio a as defined by the expression (1) is 0.9 or more and 1.6 or less.
    Type: Application
    Filed: August 3, 2020
    Publication date: November 19, 2020
    Applicant: NICHIA CORPORATION
    Inventors: Makiko IWASA, Kazushige FUJIO
  • Publication number: 20200309346
    Abstract: A light emitting device has a covering member. The covering member includes light reflecting material and a second fluorescent material, and a dominant wavelength of an emission spectrum of the second fluorescent material differs from a dominant wavelength of an emission spectrum of the light emitting device by 30 nm or less. The light emitting device emits light with chromaticity that is within a four-sided region on a CIE 1931 chromaticity diagram, where chromaticity coordinates (x, y) are (0.645, 0.335) at a first point, (0.665, 0.335) at a second point, (0.735, 0.265) at a third point, (0.721, 0.259) at a fourth point, and a first line joins the first and second points, a second line joins the second and third points, a third line joins the third and fourth points, and a fourth line joins the fourth and first points to define the four-sided region of the chromaticity diagram.
    Type: Application
    Filed: March 26, 2020
    Publication date: October 1, 2020
    Applicant: NICHIA CORPORATION
    Inventors: Makiko IWASA, Yuji SATO, Hiroki FUKUTA
  • Patent number: 10770628
    Abstract: A light emitting device includes a light emitting element having an emission peak wavelength in a range of 380 nm to 420 nm and a fluorescent member including at least one fluorescent material that is excited by light from the light emitting element for light emission, wherein a mixture of light from the light emitting element and light from the fluorescent material has a correlated color temperature in a range of 2000 K to 7500 K as measured according to JIS Z8725, and the light emitting device has a spectral distribution in which, when the integral value over a wavelength range of 380 nm to 780 nm is normalized to 100%, the proportion of an integral value over a wavelength range of 380 nm to 420 nm is 15% or more, and the ratio a as defined by the expression (1) is 0.9 or more and 1.6 or less.
    Type: Grant
    Filed: May 30, 2019
    Date of Patent: September 8, 2020
    Assignee: NICHIA CORPORATION
    Inventors: Makiko Iwasa, Kazushige Fujio
  • Publication number: 20190371978
    Abstract: A light emitting device includes a light emitting element having an emission peak wavelength in a range of 380 nm to 420 nm and a fluorescent member including at least one fluorescent material that is excited by light from the light emitting element for light emission, wherein a mixture of light from the light emitting element and light from the fluorescent material has a correlated color temperature in a range of 2000 K to 7500 K as measured according to JIS Z8725, and the light emitting device has a spectral distribution in which, when the integral value over a wavelength range of 380 nm to 780 nm is normalized to 100%, the proportion of an integral value over a wavelength range of 380 nm to 420 nm is 15% or more, and the ratio a as defined by the expression (1) is 0.9 or more and 1.6 or less.
    Type: Application
    Filed: May 30, 2019
    Publication date: December 5, 2019
    Applicant: NICHIA CORPORATION
    Inventors: Makiko IWASA, Kazushige FUJIO