Patents by Inventor Toshiyuki Hirai

Toshiyuki Hirai 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: 11897814
    Abstract: A rare earth aluminate sintered compact including rare earth aluminate phosphor crystalline phases and voids, wherein an absolute maximum length of 90% or more by number of rare earth aluminate phosphor crystalline phases is in a range from 0.4 ?m to 1.3 ?m, and an absolute maximum length of 90% or more by number of voids is in a range from 0.1 ?m to 1.2 ?m.
    Type: Grant
    Filed: August 4, 2021
    Date of Patent: February 13, 2024
    Assignee: NICHIA CORPORATION
    Inventors: Shozo Taketomi, Ryo Yamamoto, Tomomi Fujii, Toshiyuki Hirai
  • Patent number: 11851375
    Abstract: A method for producing a ceramic complex includes: preparing a raw material mixture that contains 5% by mass or more and 40% by mass or less of first rare earth aluminate fluorescent material particles containing an activating element and a first rare earth element different from the activating element, 0.1% by mass or more and 32% by mass or less of oxide particles containing a second rare earth element, and the balance of aluminum oxide particles, relative to 100% by mass of the total amount of the first rare earth aluminate fluorescent material particles, the oxide particles, and the aluminum oxide particles; preparing a molded body of the raw material mixture; and obtaining a sintered body by calcining the molded body in a temperature range of 1,550° C. or higher and 1,800° C. or lower.
    Type: Grant
    Filed: June 29, 2021
    Date of Patent: December 26, 2023
    Assignee: NICHIA CORPORATION
    Inventors: Toshiyuki Hirai, Keisuke Suzuki, Hirofumi Oguri
  • Patent number: 11585494
    Abstract: A fluorescent module includes a fluorescent member including a phosphor-containing layer, and a light reflecting layer disposed on the phosphor-containing layer. The phosphor-containing layer contains a YAG phosphor and a Ga-YAG phosphor within the same layer, the Ga-YAG phosphor being a phosphor in which a portion of the aluminum constituting the YAG phosphor is substituted with gallium. A volumetric ratio of the Ga-YAG phosphor to the entirety of the YAG phosphor and the Ga-YAG phosphor is in a range of 19.0% to 80%.
    Type: Grant
    Filed: August 24, 2021
    Date of Patent: February 21, 2023
    Assignee: NICHIA CORPORATION
    Inventors: Takafumi Sugiyama, Toshiyuki Hirai, Masahiko Sano, Toru Takasone
  • Publication number: 20230026963
    Abstract: Provided is a light emitting device, including a light emitting element having a light emission peak wavelength in a range of 380 nm or more and 500 nm or less, and a wavelength converting member including a ceramic composite including an inorganic fluorescent material having a light emission peak wavelength in a range of 510 nm or more and 570 nm or less and an inorganic oxide, and a translucent thin film having a physical film thickness in a range of 82 nm or more and 140 nm or less and a refractive index smaller than the refractive index of the ceramic composite, disposed on a light emission side of the ceramic composite, the translucent thin film including a fluoride containing at least one kind of an element selected from the group consisting of an alkali metal element, an alkaline earth metal element, and a Group 13 metal element.
    Type: Application
    Filed: July 7, 2022
    Publication date: January 26, 2023
    Applicant: NICHIA CORPORATION
    Inventors: Toshiyuki HIRAI, Gentaro TANAKA
  • Patent number: 11498883
    Abstract: A method for producing a ceramic composite includes: preparing a sintered body in a plate form containing a fluorescent material having a composition of a rare earth aluminate, and aluminum oxide; and eluting the aluminum oxide from the sintered body by contacting the sintered body with a basic substance, for example, contained in an alkali aqueous solution, and the dissolution amount of the fluorescent material eluted from the sintered body in the step of eluting the aluminum oxide is 0.5% by mass or less based on an amount of the fluorescent material contained in the sintered body as 100% by mass.
    Type: Grant
    Filed: November 24, 2020
    Date of Patent: November 15, 2022
    Assignee: NICHIA CORPORATION
    Inventor: Toshiyuki Hirai
  • Publication number: 20220186117
    Abstract: A ceramic complex including a first crystal phase containing a first rare earth aluminate fluorescent material containing an activating element and a first rare earth element that is different from the activating element, and a second crystal phase containing aluminum oxide, having a content of the first crystal phase in a range of 5% by volume or more and 40% by volume or less and a content of the second crystal phase in a range of 57% by volume or more and 95% by volume or less based on a total amount of the ceramic complex, having an average value of a second crystal diameter of the second crystal phase measured under the particular measurement condition of 12 ?m or less, and having a QD value of 0.5 or less expressed by QD=(D75?D25)/(D75+D25), wherein D25 and D75 are defined in the disclosure.
    Type: Application
    Filed: December 10, 2021
    Publication date: June 16, 2022
    Applicant: NICHIA CORPORATION
    Inventors: Hirofumi OGURI, Toshiyuki HIRAI
  • Publication number: 20220041509
    Abstract: A rare earth aluminate sintered compact including rare earth aluminate phosphor crystalline phases and voids, wherein an absolute maximum length of 90% or more by number of rare earth aluminate phosphor crystalline phases is in a range from 0.4 ?m to 1.3 ?m, and an absolute maximum length of 90% or more by number of voids is in a range from 0.1 ?m to 1.2 ?m.
    Type: Application
    Filed: August 4, 2021
    Publication date: February 10, 2022
    Applicant: NICHIA CORPORATION
    Inventors: Shozo TAKETOMI, Ryo YAMAMOTO, Tomomi FUJII, Toshiyuki HIRAI
  • Publication number: 20210403382
    Abstract: A method for producing a ceramic complex includes: preparing a raw material mixture that contains 5% by mass or more and 40% by mass or less of first rare earth aluminate fluorescent material particles containing an activating element and a first rare earth element different from the activating element, 0.1% by mass or more and 32% by mass or less of oxide particles containing a second rare earth element, and the balance of aluminum oxide particles, relative to 100% by mass of the total amount of the first rare earth aluminate fluorescent material particles, the oxide particles, and the aluminum oxide particles; preparing a molded body of the raw material mixture; and obtaining a sintered body by calcining the molded body in a temperature range of 1,550° C. or higher and 1,800° C. or lower.
    Type: Application
    Filed: June 29, 2021
    Publication date: December 30, 2021
    Applicant: NICHIA CORPORATION
    Inventors: Toshiyuki HIRAI, Keisuke SUZUKI, Hirofumi OGURI
  • Publication number: 20210381662
    Abstract: A fluorescent module includes a fluorescent member including a phosphor-containing layer, and a light reflecting layer disposed on the phosphor-containing layer. The phosphor-containing layer contains a YAG phosphor and a Ga-YAG phosphor within the same layer, the Ga-YAG phosphor being a phosphor in which a portion of the aluminum constituting the YAG phosphor is substituted with gallium. A volumetric ratio of the Ga-YAG phosphor to the entirety of the YAG phosphor and the Ga-YAG phosphor is in a range of 19.0% to 80%.
    Type: Application
    Filed: August 24, 2021
    Publication date: December 9, 2021
    Inventors: Takafumi SUGIYAMA, Toshiyuki HIRAI, Masahiko SANO, Toru TAKASONE
  • Patent number: 11131433
    Abstract: A fluorescent module includes a fluorescent member, a heat dissipation member, and an optical relaxation member. The fluorescent member includes a phosphor-containing layer, and a light reflecting layer. The fluorescent member is secured to the heat dissipation member so that the light reflecting layer is arranged between the phosphor-contacting layer and the heat dissipation member. The optical relaxation member is configured to absorb and/or diffuse light. The optical relaxation member is arranged with respect to the fluorescent member so that the light reflecting layer is arranged between the phosphor-containing layer and the optical relaxation member.
    Type: Grant
    Filed: August 8, 2019
    Date of Patent: September 28, 2021
    Assignee: NICHIA CORPORATION
    Inventors: Takafumi Sugiyama, Toshiyuki Hirai, Masahiko Sano, Toru Takasone
  • Publication number: 20210163371
    Abstract: A method for producing a ceramic composite includes: preparing a sintered body in a plate form containing a fluorescent material having a composition of a rare earth aluminate, and aluminum oxide; and eluting the aluminum oxide from the sintered body by contacting the sintered body with a basic substance, for example, contained in an alkali aqueous solution, and the dissolution amount of the fluorescent material eluted from the sintered body in the step of eluting the aluminum oxide is 0.5% by mass or less based on an amount of the fluorescent material contained in the sintered body as 100% by mass.
    Type: Application
    Filed: November 24, 2020
    Publication date: June 3, 2021
    Applicant: NICHIA CORPORATION
    Inventor: Toshiyuki HIRAI
  • Patent number: 10745543
    Abstract: There is provided a rubber composition in which an antistatic agent is uniformly dispersed and the rubber composition has antistatic ability, coefficient of friction, and wear resistance. A rubber composition includes 7 parts by mass or more of a polyether/polyolefin block copolymer resin with respect to 100 parts by mass of a rubber component, and the total amount or a part of a rubber component is mixed with a polyether/polyolefin block copolymer resin at a temperature that is equal to or higher than a melting point of the polyether/polyolefin block copolymer resin.
    Type: Grant
    Filed: May 29, 2018
    Date of Patent: August 18, 2020
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: Yudai Okuno, Masashi Hamakubo, Akihiro Mine, Toshiyuki Hirai, Yoshihiro Yamada
  • Publication number: 20200056751
    Abstract: A fluorescent module includes a fluorescent member, a heat dissipation member, and an optical relaxation member. The fluorescent member includes a phosphor-containing layer, and a light reflecting layer. The fluorescent member is secured to the heat dissipation member so that the light reflecting layer is arranged between the phosphor-contacting layer and the heat dissipation member. The optical relaxation member is configured to absorb and/or diffuse light. The optical relaxation member is arranged with respect to the fluorescent member so that the light reflecting layer is arranged between the phosphor-containing layer and the optical relaxation member.
    Type: Application
    Filed: August 8, 2019
    Publication date: February 20, 2020
    Inventors: Takafumi SUGIYAMA, Toshiyuki HIRAI, Masahiko SANO, Toru TAKASONE
  • Publication number: 20200002109
    Abstract: Provided are a rubber composition capable of imparting a high tensile strength to a roller main body so as to be able to be used for equipment that allows paper to pass through at high speed, while maintaining high abrasion resistance of the roller main body and a favorable paper feeding performance of the paper feeding roller; and a paper feeding roller. There is provided a rubber composition contains: a rubber that includes a non-oil extended EPDM having an ethylene content of 55 to 72%; and more than 20 parts by mass and 30 parts by mass or less of a filler, and 2.5 parts by mass or more of a peroxide crosslinking agent per 100 parts by mass of the rubber, in which the filler contains 15 to 30 parts by mass of an amorphous silica per 100 parts by mass of the rubber.
    Type: Application
    Filed: March 28, 2019
    Publication date: January 2, 2020
    Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: MASASHI HAMAKUBO, TOSHIYUKI HIRAI, YOSHIHIRO YAMADA
  • Patent number: 10261460
    Abstract: A paper feed roller of the present invention comprises a roller body 2 integrally formed of elastic material in a cylindrical shape in which a plurality of protruding lines 6 are disposed on a peripheral surface 5 at even intervals, wherein the roller body 2 is formed so that crest portions 6a and trough portions 6b are continuously provided in a circumferential direction, an opening angle ? is equal to or more than 2° and is equal to or less than 8°, a radial height h of the protruding line is equal to or more than 0.051 mm and is equal to or less than 0.1 mm, and a curvature radius r1 at a shoulder is equal to or more than 0.55 mm.
    Type: Grant
    Filed: September 27, 2016
    Date of Patent: April 16, 2019
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: Hirofumi Konishi, Akihiro Mine, Toshiyuki Hirai, Yoshihiro Yamada, Yudai Okuno, Yuichi Sato
  • Publication number: 20190016875
    Abstract: There is provided a rubber composition in which an antistatic agent is uniformly dispersed and the rubber composition has antistatic ability, coefficient of friction, and wear resistance. A rubber composition includes 7 parts by mass or more of a polyether/polyolefin block copolymer resin with respect to 100 parts by mass of a rubber component, and the total amount or a part of a rubber component is mixed with a polyether/polyolefin block copolymer resin at a temperature that is equal to or higher than a melting point of the polyether/polyolefin block copolymer resin.
    Type: Application
    Filed: May 29, 2018
    Publication date: January 17, 2019
    Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: YUDAI OKUNO, MASASHI HAMAKUBO, AKIHIRO MINE, TOSHIYUKI HIRAI, YOSHIHIRO YAMADA
  • Publication number: 20180072528
    Abstract: The invention provides a paper feed roller capable of reducing abnormal noise caused by a knurled shape while maintaining characteristics thereof, including maintaining friction coefficient and coping with paper powder. The paper feed roller comprises a roller body formed of elastic material in a cylindrical shape and is characterized in that the roller body has protruding lines and recessed grooves inclinedly extending relative to an axis of the roller body so that convex and concave portions having predetermined widths are alternatively formed in a circumferential direction of a peripheral surface, and the protruding lines have one-end side protruding line portions extending from a central part in an axial direction of the roller body toward one end thereof and other-end side protruding line portions extending from the central part in the axial direction toward the other end, and they are inclined relative to the axis in opposite directions.
    Type: Application
    Filed: August 15, 2017
    Publication date: March 15, 2018
    Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: Yoshihiro YAMADA, Akihiro MINE, Toshiyuki HIRAI, Hirofumi KONISHI
  • Publication number: 20170097602
    Abstract: A paper feed roller of the present invention comprises a roller body 2 integrally formed of elastic material in a cylindrical shape in which a plurality of protruding lines 6 are disposed on a peripheral surface 5 at even intervals, wherein the roller body 2 is formed so that crest portions 6a and trough portions 6b are continuously provided in a circumferential direction, an opening angle ? is equal to or more than 2° and is equal to or less than 8°, a radial height h of the protruding line is equal to or more than 0.051 mm and is equal to or less than 0.1 mm, and a curvature radius r1 at a shoulder is equal to or more than 0.55 mm.
    Type: Application
    Filed: September 27, 2016
    Publication date: April 6, 2017
    Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: Hirofumi KONISHI, Akihiro MINE, Toshiyuki HIRAI, Yoshihiro YAMADA, Yudai OKUNO, Yuichi SATO
  • Patent number: 8807554
    Abstract: The inventive sheet conveying roller includes a plurality of linear projections provided on an outer peripheral surface of a roller body of an elastic material and each having a generally right-angled triangular cross section which includes a hypotenuse edge and an adjoining edge provided on a forward side and on a rearward side, respectively, with respect to a roller body rotation direction, the adjoining edge aligning with a line perpendicular to a center axis of the roller body. The linear projections are rounded with the hypotenuse edges and the adjoining edges thereof connected to each other by curves as seen in section, and provided integrally with the roller body to be equidistantly arranged on the outer peripheral surface of the roller body.
    Type: Grant
    Filed: July 3, 2013
    Date of Patent: August 19, 2014
    Assignee: Sumitomo Rubber Industries, Ltd.
    Inventors: Akihiro Mine, Hirokazu Nishimori, Masahiro Yoshizato, Toshiyuki Hirai, Toshihiro Tamura, Keishi Yamamoto
  • Publication number: 20140042691
    Abstract: The inventive sheet conveying roller includes a plurality of linear projections (6) provided on an outer peripheral surface (5) of a roller body (2) of an elastic material and each having a generally right-angled triangular cross section which includes a hypotenuse edge (7) and an adjoining edge (9) provided on a forward side and on a rearward side, respectively, with respect to a roller body rotation direction, the adjoining edge (9) aligning with a line (8) perpendicular to a center axis (L) of the roller body (2). The linear projections (6) are rounded with the hypotenuse edges (7) and the adjoining edges (9) thereof connected to each other by curves (10, 11) as seen in section, and provided integrally with the roller body (2) to be equidistantly arranged on the outer peripheral surface of the roller body.
    Type: Application
    Filed: July 3, 2013
    Publication date: February 13, 2014
    Inventors: Akihiro MINE, Hirokazu NISHIMORI, Masahiro YOSHIZATO, Toshiyuki HIRAI, Toshihiro TAMURA, Keishi YAMAMOTO