Patents by Inventor Tsutomu Asakawa

Tsutomu Asakawa 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: 11107970
    Abstract: A piezoelectric element including a first electrode provided above a base body, a first piezoelectric layer provided so as to be in contact with the base body and cover the first electrode, a second piezoelectric layer provided above the first piezoelectric layer, and a second electrode provided above the second piezoelectric layer, wherein the first piezoelectric layer includes a composite oxide that contains potassium and niobium and that has a perovskite-type structure containing potassium as a main component at an A-site, the second piezoelectric layer includes a composite oxide that contains potassium, sodium, and niobium and that has a perovskite-type structure, and the first piezoelectric layer has a higher potassium atomic concentration (atm %) than the second piezoelectric layer.
    Type: Grant
    Filed: September 26, 2019
    Date of Patent: August 31, 2021
    Inventors: Kazuya Kitada, Tsutomu Asakawa
  • Patent number: 11069874
    Abstract: An organic EL element includes a pixel electrode, a light emitting function layer that is formed on the pixel electrode, an electron injection layer formed on the light emitting function layer, and a counter electrode that is formed on the electron injection layer and that has semi-transmissive reflectivity, in which the counter electrode contains a reductive material that reduces material of the electron injection layer and Ag with atomic ratio of 75% or more, and an adsorption layer is formed on the counter electrode.
    Type: Grant
    Filed: June 15, 2020
    Date of Patent: July 20, 2021
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Koya Shiratori, Yuki Hanamura, Tsutomu Asakawa
  • Publication number: 20210074942
    Abstract: An organic EL element includes a pixel electrode, a light emitting function layer that is formed on the pixel electrode, an electron injection layer formed on the light emitting function layer, and a counter electrode that is formed on the electron injection layer and that has semi-transmissive reflectivity, in which the counter electrode contains a reductive material that reduces material of the electron injection layer and Ag with atomic ratio of 75% or more, and an adsorption layer is formed on the counter electrode.
    Type: Application
    Filed: November 3, 2020
    Publication date: March 11, 2021
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Koya SHIRATORI, Yuki HANAMURA, Tsutomu ASAKAWA
  • Patent number: 10937942
    Abstract: A piezoelectric element includes a substrate, a first electrode formed on the substrate, a piezoelectric layer, which is a layered structure of a plurality of piezoelectric films each containing potassium, sodium, and niobium, formed on the first electrode, and a second electrode formed on the piezoelectric layer. A sodium concentration in the piezoelectric layer has a Na local maximum value, which is a local maximum value of the sodium concentration, in a first piezoelectric film, which is among the plurality of piezoelectric films, in the vicinity of the first electrode, a sodium concentration gradient decreasing from the Na local maximum value toward the second electrode, and a Na local minimum value, which is a local minimum value of the sodium concentration, near a boundary between the first piezoelectric film and a second piezoelectric film formed immediately above the first piezoelectric film.
    Type: Grant
    Filed: March 9, 2018
    Date of Patent: March 2, 2021
    Inventors: Kazuya Kitada, Koji Sumi, Tomohiro Sakai, Toshiaki Takahashi, Tsutomu Asakawa
  • Patent number: 10825979
    Abstract: A piezoelectric element includes: a substrate; a first electrode which is disposed on the substrate; a piezoelectric body layer which is disposed on the first electrode, which has a plurality of layers configured to contain a piezoelectric body material, and in which the total thickness of the plurality of layers is within a range of 1.6 ?m to 10 ?m; and an intermediate layer which is disposed on an interlayer of the piezoelectric body layer, and which is configured to contain titanium.
    Type: Grant
    Filed: August 28, 2017
    Date of Patent: November 3, 2020
    Assignee: Seiko Epson Corporation
    Inventors: Tomokazu Kobayashi, Mitsumi Kishida, Tsutomu Asakawa
  • Publication number: 20200313109
    Abstract: An organic EL element includes a pixel electrode, a light emitting function layer that is formed on the pixel electrode, an electron injection layer formed on the light emitting function layer, and a counter electrode that is formed on the electron injection layer and that has semi-transmissive reflectivity, in which the counter electrode contains a reductive material that reduces material of the electron injection layer and Ag with atomic ratio of 75% or more, and an adsorption layer is formed on the counter electrode.
    Type: Application
    Filed: June 15, 2020
    Publication date: October 1, 2020
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Koya SHIRATORI, Yuki HANAMURA, Tsutomu ASAKAWA
  • Patent number: 10720595
    Abstract: An organic EL element includes a pixel electrode, a light emitting function layer that is formed on the pixel electrode, an electron injection layer formed on the light emitting function layer, and a counter electrode that is formed on the electron injection layer and that has semi-transmissive reflectivity, in which the counter electrode contains a reductive material that reduces material of the electron injection layer and Ag with atomic ratio of 75% or more, and an adsorption layer is formed on the counter electrode.
    Type: Grant
    Filed: April 12, 2018
    Date of Patent: July 21, 2020
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Koya Shiratori, Yuki Hanamura, Tsutomu Asakawa
  • Patent number: 10700258
    Abstract: A piezoelectric element includes a substrate; a first electrode formed above the substrate; a piezoelectric layer which contains a composite oxide having a perovskite crystal structure and which is formed above the first electrode; and a second electrode formed above the piezoelectric layer, and the amount of carbon contained in the substrate is 0.26 to less than 14.00 percent by atom.
    Type: Grant
    Filed: December 21, 2018
    Date of Patent: June 30, 2020
    Assignee: Seiko Epson Corporation
    Inventors: Kazuya Kitada, Masayuki Omoto, Tsutomu Asakawa, Hidemichi Furihata
  • Patent number: 10611150
    Abstract: A liquid discharge head includes a pressure chamber that accommodates a liquid, a diaphragm that forms a wall surface of the pressure chamber, and a piezoelectric element that is provided on an opposite side of the pressure chamber with the diaphragm interposed between the piezoelectric element and the pressure chamber and vibrates the diaphragm. The diaphragm includes a silicon oxynitride layer formed with including silicon oxynitride.
    Type: Grant
    Filed: September 11, 2018
    Date of Patent: April 7, 2020
    Assignee: Seiko Epson Corporation
    Inventors: Tsutomu Nishiwaki, Hiroshi Kato, Tsutomu Asakawa
  • Publication number: 20200105995
    Abstract: A piezoelectric element including a first electrode provided above a base body, a first piezoelectric layer provided so as to be in contact with the base body and cover the first electrode, a second piezoelectric layer provided above the first piezoelectric layer, and a second electrode provided above the second piezoelectric layer, wherein the first piezoelectric layer includes a composite oxide that contains potassium and niobium and that has a perovskite-type structure containing potassium as amain component at an A-site, the second piezoelectric layer includes a composite oxide that contains potassium, sodium, and niobium and that has a perovskite-type structure, and the first piezoelectric layer has a higher potassium atomic concentration (atm %) than the second piezoelectric layer.
    Type: Application
    Filed: September 26, 2019
    Publication date: April 2, 2020
    Inventors: Kazuya KITADA, Tsutomu ASAKAWA
  • Publication number: 20190198747
    Abstract: A piezoelectric element includes a substrate; a first electrode formed above the substrate; a piezoelectric layer which contains a composite oxide having a perovskite crystal structure and which is formed above the first electrode; and a second electrode formed above the piezoelectric layer, and the amount of carbon contained in the substrate is 0.26 to less than 14.00 percent by atom.
    Type: Application
    Filed: December 21, 2018
    Publication date: June 27, 2019
    Inventors: Kazuya KITADA, Masayuki OMOTO, Tsutomu ASAKAWA, Hidemichi FURIHATA
  • Publication number: 20190077150
    Abstract: A liquid discharge head includes a pressure chamber that accommodates a liquid, a diaphragm that forms a wall surface of the pressure chamber, and a piezoelectric element that is provided on an opposite side of the pressure chamber with the diaphragm interposed between the piezoelectric element and the pressure chamber and vibrates the diaphragm. The diaphragm includes a silicon oxynitride layer formed with including silicon oxynitride.
    Type: Application
    Filed: September 11, 2018
    Publication date: March 14, 2019
    Inventors: Tsutomu NISHIWAKI, Hiroshi KATO, Tsutomu ASAKAWA
  • Publication number: 20190019941
    Abstract: A piezoelectric element includes a first electrode; a piezoelectric layer, placed on or above the first electrode, containing potassium, sodium, niobium, titanium, and oxygen; and a second electrode placed on or above the piezoelectric layer.
    Type: Application
    Filed: July 10, 2018
    Publication date: January 17, 2019
    Inventors: Koji SUMI, Tomokazu KOBAYASHI, Tomohiro SAKAI, Kazuya KITADA, Koichi MOROZUMI, Tsutomu ASAKAWA
  • Patent number: 10134977
    Abstract: A piezoelectric element has, from a substrate side, a first electrode, a piezoelectric layer containing a composite oxide of an ABO3 type perovskite structure containing Mg, and a second electrode, which are laminated, in which the first electrode includes a diffusion suppressing layer which suppresses diffusion of the Mg and a diffusion layer which diffuses the Mg as compared with the diffusion suppressing layer, and the diffusion suppressing layer is provided on the substrate side relative to the diffusion layer.
    Type: Grant
    Filed: October 16, 2015
    Date of Patent: November 20, 2018
    Assignee: Seiko Epson Corporation
    Inventors: Takayuki Yonemura, Tsutomu Asakawa
  • Publication number: 20180287048
    Abstract: A piezoelectric element includes a substrate, a first electrode formed on the substrate, a piezoelectric layer, which is a layered structure of a plurality of piezoelectric films each containing potassium, sodium, and niobium, formed on the first electrode, and a second electrode formed on the piezoelectric layer. A sodium concentration in the piezoelectric layer has a Na local maximum value, which is a local maximum value of the sodium concentration, in a first piezoelectric film, which is among the plurality of piezoelectric films, in the vicinity of the first electrode, a sodium concentration gradient decreasing from the Na local maximum value toward the second electrode, and a Na local minimum value, which is a local minimum value of the sodium concentration, near a boundary between the first piezoelectric film and a second piezoelectric film formed immediately above the first piezoelectric film.
    Type: Application
    Filed: March 9, 2018
    Publication date: October 4, 2018
    Inventors: Kazuya KITADA, Koji SUMI, Tomohiro SAKAI, Toshiaki TAKAHASHI, Tsutomu ASAKAWA
  • Publication number: 20180233692
    Abstract: An organic EL element includes a pixel electrode, a light emitting function layer that is formed on the pixel electrode, an electron injection layer formed on the light emitting function layer, and a counter electrode that is formed on the electron injection layer and that has semi-transmissive reflectivity, in which the counter electrode contains a reductive material that reduces material of the electron injection layer and Ag with atomic ratio of 75% or more, and an adsorption layer is formed on the counter electrode.
    Type: Application
    Filed: April 12, 2018
    Publication date: August 16, 2018
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Koya SHIRATORI, Yuki HANAMURA, Tsutomu ASAKAWA
  • Patent number: 9972804
    Abstract: An organic EL element includes a pixel electrode, a light emitting function layer that is formed on the pixel electrode, an electron injection layer formed on the light emitting function layer, and a counter electrode that is formed on the electron injection layer and that has semi-transmissive reflectivity, in which the counter electrode contains a reductive material that reduces material of the electron injection layer and Ag with atomic ratio of 75% or more, and an adsorption layer is formed on the counter electrode.
    Type: Grant
    Filed: March 7, 2017
    Date of Patent: May 15, 2018
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Koya Shiratori, Yuki Hanamura, Tsutomu Asakawa
  • Publication number: 20180062064
    Abstract: A piezoelectric element includes: a substrate; a first electrode which is disposed on the substrate; a piezoelectric body layer which is disposed on the first electrode, which has a plurality of layers configured to contain a piezoelectric body material, and in which the total thickness of the plurality of layers is within a range of 1.6 ?m to 10 ?m; and an intermediate layer which is disposed on an interlayer of the piezoelectric body layer, and which is configured to contain titanium.
    Type: Application
    Filed: August 28, 2017
    Publication date: March 1, 2018
    Inventors: Tomokazu KOBAYASHI, Mitsumi KISHIDA, Tsutomu ASAKAWA
  • Patent number: 9843022
    Abstract: An organic light emitting device has a substrate, an organic light emitting element disposed on the substrate, and a sealing layer sealing the organic light emitting element by covering the organic light emitting element. The sealing layer is a multilayer body in which a first sealing layer mainly containing an inorganic material, a buffer layer mainly containing a resin material, and a second sealing layer mainly containing silicon oxynitride are successively stacked from a side of the organic light emitting element. The first sealing layer has a heavy hydrogen diffusion coefficient of 1.0×10?21 m2/sec or more at 85° C. in a heavy hydrogen atmosphere.
    Type: Grant
    Filed: July 22, 2016
    Date of Patent: December 12, 2017
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Hisatoshi Nakamura, Shinichi Iwata, Takefumi Fukagawa, Tsutomu Asakawa, Yuki Hanamura
  • Publication number: 20170279068
    Abstract: An organic EL element includes a pixel electrode, a light emitting function layer that is formed on the pixel electrode, an electron injection layer formed on the light emitting function layer, and a counter electrode that is formed on the electron injection layer and that has semi-transmissive reflectivity, in which the counter electrode contains a reductive material that reduces material of the electron injection layer and Ag with atomic ratio of 75% or more, and an adsorption layer is formed on the counter electrode.
    Type: Application
    Filed: March 7, 2017
    Publication date: September 28, 2017
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Koya SHIRATORI, Yuki HANAMURA, Tsutomu ASAKAWA