Patents by Inventor Yukihiro Fukuta

Yukihiro Fukuta 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: 10739474
    Abstract: A scintillator array includes a first scintillator element, a second scintillator element, and a reflector provided between the first and second scintillator elements and having a width of 80 ?m or less therebetween. Each scintillator element includes a polycrystal containing a rare earth oxysulfide phosphor, the polycrystal having a radiation incident surface of 1 mm or less×1 mm or less in area. An average crystal grain diameter of the polycrystal is not less than 5 ?m nor more than 30 ?m, the average crystal grain diameter being defined by an average intercept length of crystal grains in an observation image of the polycrystal with a scanning electron microscope. A maximum length or a maximum diameter of defects on the polycrystal is 40 ?m or less.
    Type: Grant
    Filed: June 3, 2019
    Date of Patent: August 11, 2020
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.
    Inventors: Makoto Hayashi, Hiroyasu Kondo, Hiroshi Ichikawa, Yoshitaka Adachi, Yukihiro Fukuta
  • Patent number: 10684377
    Abstract: A scintillator comprises a sintered body having a volume of 1 mm3 or less. The sintered body includes a crystal region of a rare earth oxysulfide. The number of polycrystal bodies each having a different composition from that of the crystal region is 200 or less per a unit area of 100 ?m×100 ?m of a cross section of the sintered body.
    Type: Grant
    Filed: April 26, 2018
    Date of Patent: June 16, 2020
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.
    Inventors: Kazumitsu Morimoto, Yoshitaka Adachi, Yukihiro Fukuta
  • Patent number: 10473597
    Abstract: A neutron grid, comprises: a grid including: a plurality of spacers through which at least a part of first neutrons from a target passes; and a plurality of absorbers to absorb at least a part of second neutrons scattered thorough the target, the spacers and the absorbers being alternately arranged along a first direction and extending along a second direction intersecting with the first direction; and a pair of covers through which at least a part of the first neutrons and at least a part of the second neutrons pass, sandwiching the grid along a third direction intersecting with the first and second directions. A thermal expansion coefficient difference between one of the spacers and one of the absorbers is ±9×10?6/° C. or less, or Young's modulus of the spacer is 100 GPa or more.
    Type: Grant
    Filed: September 24, 2018
    Date of Patent: November 12, 2019
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.
    Inventors: Yukihiro Fukuta, Yoshitaka Adachi, Nobuaki Nakashima, Koichi Nittoh
  • Publication number: 20190302284
    Abstract: A scintillator array comprises: a first scintillator element; a second scintillator element; and a reflector provided between the first and second scintillator elements and having a width of 80 gm or less therebetween. Each scintillator element includes a polycrystal containing a rare earth oxysulfide phosphor, the polycrystal having a radiation incident surface of 1 mm or less×1 mm or less in area. An average crystal grain diameter of the polycrystal is not less than 5 ?m nor more than 30 ?m, the average crystal grain diameter being defined by an average intercept length of crystal grains in an observation image of the polycrystal with a scanning electron microscope. A maximum length or a maximum diameter of defects on the polycrystal is 40 ?m or less.
    Type: Application
    Filed: June 3, 2019
    Publication date: October 3, 2019
    Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA MATERIALS CO., LTD.
    Inventors: Makoto HAYASHI, Hiroyasu Kondo, Hiroshi Ichikawa, Yoshitaka Adachi, Yukihiro Fukuta
  • Patent number: 10416319
    Abstract: A ceramic scintillator array of an embodiment includes: a plurality of scintillator segments each composed of a sintered compact of a rare earth oxysulfide phosphor; and a reflective layer interposed between the scintillator segments adjacent to each other. The reflective layer contains a transparent resin and reflective particles dispersed in the transparent resin. The reflective particles contain titanium oxide and at least one inorganic substance selected from the group consisting of alumina, zirconia, and silica. A glass transition point of the transparent resin is 50° C. or higher, and a thermal expansion coefficient of the transparent resin at a temperature higher than the glass transition point is 3.5×10?5/° C. or less.
    Type: Grant
    Filed: February 28, 2018
    Date of Patent: September 17, 2019
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.
    Inventors: Kazumitsu Morimoto, Yukihiro Fukuta, Akihisa Saito, Hiroyasu Kondo
  • Publication number: 20190025230
    Abstract: A neutron grid, comprises: a grid including: a plurality of spacers through which at least a part of first neutrons from a target passes; and a plurality of absorbers to absorb at least a part of second neutrons scattered thorough the target, the spacers and the absorbers being alternately arranged along a first direction and extending along a second direction intersecting with the first direction; and a pair of covers through which at least a part of the first neutrons and at least a part of the second neutrons pass, sandwiching the grid along a third direction intersecting with the first and second directions. A thermal expansion coefficient difference between one of the spacers and one of the absorbers is ±9×10?6/° C. or less, or Young's modulus of the spacer is 100 GPa or more.
    Type: Application
    Filed: September 24, 2018
    Publication date: January 24, 2019
    Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA MATERIALS CO., LTD.
    Inventors: Yukihiro Fukuta, Yoshitaka Adachi, Nobuaki Nakashima, Koichi Nittoh
  • Publication number: 20180252824
    Abstract: A scintillator comprises a sintered body having a volume of 1 mm3 or less. The sintered body includes a crystal region of a rare earth oxysulfide. The number of polycrystal bodies each having a different composition from that of the crystal region is 200 or less per a unit area of 100 ?m×100 ?m of a cross section of the sintered body.
    Type: Application
    Filed: April 26, 2018
    Publication date: September 6, 2018
    Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA MATERIALS CO., LTD.
    Inventors: Kazumitsu MORIMOTO, Yoshitaka ADACHI, Yukihiro FUKUTA
  • Publication number: 20180196146
    Abstract: There is provided a scintillator array to be used for a neutron detector capable of detecting high energy neutrons with high definition and high efficiency. A scintillator array comprises a structure including a plurality of stacks layered each other. Each of the stacks has in sequence: a light reflector including ceramics or single-crystal silicon; a first film to react with a neutron incident along a direction intersecting a lamination direction of the stacks and thus emit a radiation ray; a second film including a material to reflect light; and a scintillator to emit light in response to the radiation ray. The light from the scintillator is reflected by the reflector and the second film to propagate an inside of the scintillator and thus to be led to an outside of the structure.
    Type: Application
    Filed: February 28, 2018
    Publication date: July 12, 2018
    Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA MATERIALS CO., LTD.
    Inventors: Yukihiro FUKUTA, Yoshitaka ADACHI, Nobuaki NAKASHIMA, Koichi NITTOH
  • Publication number: 20180188387
    Abstract: A ceramic scintillator array of an embodiment includes: a plurality of scintillator segments each composed of a sintered compact of a rare earth oxysulfide phosphor; and a reflective layer interposed between the scintillator segments adjacent to each other. The reflective layer contains a transparent resin and reflective particles dispersed in the transparent resin. The reflective particles contain titanium oxide and at least one inorganic substance selected from the group consisting of alumina, zirconia, and silica. A glass transition point of the transparent resin is 50° C. or higher, and a thermal expansion coefficient of the transparent resin at a temperature higher than the glass transition point is 3.5×10?5/° C. or less.
    Type: Application
    Filed: February 28, 2018
    Publication date: July 5, 2018
    Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA MATERIALS CO., LTD.
    Inventors: Kazumitsu MORIMOTO, Yukihiro Fukuta, Akihisa Saito, Hiroyasu Kondo
  • Patent number: 9193903
    Abstract: A solid scintillator in an embodiment includes a polycrystal body of an oxide having a garnet structure. In the solid scintillator, a linear transmittance at a wavelength of 680 nm is 10% or more. The oxide constituting the solid scintillator has a composition represented by, for Example, General formula: (Gd1??????Tb?Lu?Ce?)3(Al1?xGax)aOb, wherein 0<??0.55, 0<??0.55, 0.0001???0.1, ?+?+?<1, 0<x<1, 4.8?a?5.2, 11.6?b?12.4.
    Type: Grant
    Filed: September 4, 2014
    Date of Patent: November 24, 2015
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.
    Inventors: Makoto Hayashi, Yukihiro Fukuta, Takao Sawa
  • Patent number: 9038930
    Abstract: In a fuel injection device, a pressing surface of a pressing member presses an opening wall surface to interrupt communication between an inflow port and a pressure control chamber when communication between an outflow port and a return channel is made by a pressure control valve, and the pressing surface of the pressing member is displaced and separated from the opening wall surface to open the inflow port of the opening wall surface to the pressure control chamber when the communication between the outflow port and the return channel is interrupted by the pressure control valve. One of the pressing surface of the pressing member and the opening wall surface of the control body is provided with an inflow depressed portion and an outflow depressed portion partitioned from each other, and a depressed dimension of the inflow depressed portion is larger than a depressed dimension of the outflow depressed portion.
    Type: Grant
    Filed: March 21, 2011
    Date of Patent: May 26, 2015
    Assignee: DENSO CORPORATION
    Inventors: Yukihiro Fukuta, Tsukasa Yamashita
  • Publication number: 20150021485
    Abstract: A solid scintillator in an embodiment includes a polycrystal body of an oxide having a garnet structure. In the solid scintillator, a linear transmittance at a wavelength of 680 nm is 10% or more. The oxide constituting the solid scintillator has a composition represented by, for Example, General formula: (Gd1??????Tb?Lu?Ce?)3(Al1?xGax)aOb, wherein 0<??0.55, 0<??0.55, 0.0001???0.1, ?+?+?<1, 0<x<1, 4.8?a?5.2, 11.6?b?12.4.
    Type: Application
    Filed: September 4, 2014
    Publication date: January 22, 2015
    Inventors: Makoto HAYASHI, Yukihiro FUKUTA, Takao SAWA
  • Patent number: 8431042
    Abstract: In an embodiment, a solid state scintillator material includes a composition represented by a general formula: (Gd1-?-?-?TB?Lu?Ce?)3(Al1-xGax)aOb, where ? and ? are numbers satisfying 0<??0.5, 0<??0.5, and ?+??0.85, ? is a number satisfying 0.0001???0.1, x is a number satisfying 0<x<1, a is a number satisfying 4.8?a?5.2 and b is a number satisfying 11.6?b?12.4 (atomic ratio), and a garnet structure.
    Type: Grant
    Filed: February 21, 2012
    Date of Patent: April 30, 2013
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.
    Inventors: Yukihiro Fukuta, Takao Sawa, Makoto Hayashi
  • Patent number: 8377335
    Abstract: A solid scintillator having short afterglow and high output, containing a polycrystal containing a crystal of a Gd garnet structure oxide having a composition ratio of formula (1): (M1-x-yGdxQy)3J5O12??(1) where M is at least one element of La and Tb, Q is at least one element of Ce and Pr, J is at least one element selected from Al, Ga, and In, x and y satisfy the relations 0.5?x<1, and 0.000001?y?0.2, and further containing Si and fluorine, where the solid scintillator contains 1 ppm by mass to 1000 ppm by mass of the Si with respect to the Gd garnet structure oxide, and 1 ppm by mass to 100 ppm by mass of the fluorine with respect to the Gd garnet structure oxide. In addition a radiation detector and a tomograph employing the solid scintillator.
    Type: Grant
    Filed: February 22, 2010
    Date of Patent: February 19, 2013
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.
    Inventors: Yukihiro Fukuta, Hiroyasu Oota, Tsutomu Ishii, Yoshitaka Funayama
  • Publication number: 20120145962
    Abstract: In an embodiment, a solid state scintillator material includes a composition represented by a general formula: (Gd1-?-?-?TB?Lu?Ce?)3(Al1-xGax)aOb, where ? and ? are numbers satisfying 0<??0.5, 0<??0.5, and ?+??0.85, ? is a number satisfying 0.0001???0.1, x is a number satisfying 0<x<1, a is a number satisfying 4.8?a?5.2 and b is a number satisfying 11.6?b?12.4 (atomic ratio), and a garnet structure.
    Type: Application
    Filed: February 21, 2012
    Publication date: June 14, 2012
    Inventors: Yukihiro Fukuta, Takao Sawa, Makoto Hayashi
  • Patent number: 8083968
    Abstract: The solid scintillator according to the present invention is expressed by the following formula (1): [Formula 1] (M1-x-yGdxCey)3J5O12??(1) (wherein M is at least one element of La and Tb; J is at least one metal selected from the group consisting of Al, Ga, and In; and x and y are such that 0.5?x?1 and 0.000001?y?0.2). The transmittance of light having a wavelength of 550 nm measured at a thickness of 2 mm is equal to or greater than 40%. The solid scintillator according to the present invention can be manufactured at low cost, has a high light emitting power, and does not release Cd because Cd is not contained.
    Type: Grant
    Filed: February 23, 2009
    Date of Patent: December 27, 2011
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.
    Inventors: Yukihiro Fukuta, Masami Okamura, Yasuhiro Shirakawa
  • Publication number: 20110303873
    Abstract: An object of the present invention is to provide a solid scintillator having short afterglow and high output, and a radiation detector and a tomograph using the solid scintillator. A solid scintillator according to the present invention is a solid scintillator comprising a polycrystal containing a crystal of a Gd garnet structure oxide having a composition ratio represented by the following formula (1): [Formula 1] (M1-x-yGdxQy)3J5O12??(1) wherein M is at least one element of La and Tb, Q is at least one element of Ce and Pr, J is at least one element selected from Al, Ga, and In, x and y satisfy relations 0.5?x?1, and 0.000001?y?0.2, and further containing Si and fluorine, wherein the solid scintillator contains 1 ppm by mass to 1000 ppm by mass of the Si with respect to the Gd garnet structure oxide, and 1 ppm by mass to 100 ppm by mass of the fluorine with respect to the Gd garnet structure oxide.
    Type: Application
    Filed: February 22, 2010
    Publication date: December 15, 2011
    Applicants: Toshiba Materials Co., Ltd., Kabushiki Kaisha Toshiba
    Inventors: Yukihiro Fukuta, Hiroyasu Oota, Tsutomu Ishii, Yoshitaka Funayama
  • Publication number: 20110233309
    Abstract: In a fuel injection device, a pressing surface of a pressing member presses an opening wall surface to interrupt communication between an inflow port and a pressure control chamber when communication between an outflow port and a return channel is made by a pressure control valve, and the pressing surface of the pressing member is displaced and separated from the opening wall surface to open the inflow port of the opening wall surface to the pressure control chamber when the communication between the outflow port and the return channel is interrupted by the pressure control valve. One of the pressing surface of the pressing member and the opening wall surface of the control body is provided with an inflow depressed portion and an outflow depressed portion partitioned from each other, and a depressed dimension of the inflow depressed portion is larger than a depressed dimension of the outflow depressed portion.
    Type: Application
    Filed: March 21, 2011
    Publication date: September 29, 2011
    Applicant: DENSO CORPORATION
    Inventors: Yukihiro FUKUTA, Tsukasa Yamashita
  • Patent number: 7923740
    Abstract: The present invention relates to a light emitting apparatus including a semiconductor light emitting element and a transparent ceramic phosphor for converting a wavelength of a light emitted from the semiconductor light emitting element, wherein the semiconductor light emitting element emits an ultraviolet light, and the ceramic phosphor corresponding to the semiconductor light emitting element has (i) a minimum transmission of 0.1 to 40% under a wavelength of 350-420 nm and (ii) a transmission of 10 to 90% under an emission peak wavelength of the ceramic phosphor.
    Type: Grant
    Filed: February 23, 2006
    Date of Patent: April 12, 2011
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.
    Inventors: Masami Okamura, Masaaki Tamatani, Naomi Shida, Kazuaki Ootsuka, Yukihiro Fukuta
  • Publication number: 20110024684
    Abstract: The solid scintillator according to the present invention is expressed by the following formula (1): [Formula 1] (M1-x-yGdxCey)3J5O12??(1) (wherein M is at least one element of La and Tb; J is at least one metal selected from the group consisting of Al, Ga, and In; and x and y are such that 0.5?x?1 and 0.000001?y?0.2). The transmittance of light having a wavelength of 550 nm measured at a thickness of 2 mm is equal to or greater than 40%. The solid scintillator according to the present invention can be manufactured at low cost, has a high light emitting power, and does not release Cd because Cd is not contained.
    Type: Application
    Filed: February 23, 2009
    Publication date: February 3, 2011
    Applicants: Kabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.
    Inventors: Yukihiro Fukuta, Masami Okamura, Yasuhiro Shirakawa