Patents by Inventor Yoshitaka Funayama
Yoshitaka Funayama 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).
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Patent number: 11563155Abstract: According to one embodiment, a white light source includes a combination of a light emitting diode and phosphors. One of the phosphors is at least a cerium activated yttrium aluminum garnet-based phosphor. There is no light emission spectrum peak at which a ratio of a largest maximum value to a minimum value is greater than 1.9. The largest maximum value is largest among at least one maximum value present in a wavelength range of 400 nm to 500 nm in a light emission spectrum of white light emitted from the white light source. The minimum value is adjacent to the largest maximum value in a longer wavelength side of the light emission spectrum.Type: GrantFiled: January 29, 2021Date of Patent: January 24, 2023Assignee: Seoul Semiconductor Co., Ltd.Inventors: Tatsunori Itoga, Ryoji Tsuda, Naotoshi Matsuda, Yoshitaka Funayama
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Publication number: 20210151638Abstract: According to one embodiment, a white light source includes a combination of a light emitting diode and phosphors. One of the phosphors is at least a cerium activated yttrium aluminum garnet-based phosphor. There is no light emission spectrum peak at which a ratio of a largest maximum value to a minimum value is greater than 1.9. The largest maximum value is largest among at least one maximum value present in a wavelength range of 400 nm to 500 nm in a light emission spectrum of white light emitted from the white light source. The minimum value is adjacent to the largest maximum value in a longer wavelength side of the light emission spectrum.Type: ApplicationFiled: January 29, 2021Publication date: May 20, 2021Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA MATERIALS CO., LTD.Inventors: Tatsunori ITOGA, Ryoji TSUDA, Naotoshi MATSUDA, Yoshitaka FUNAYAMA
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Patent number: 11005010Abstract: A phosphor has a composition represented by Chemical formula 1: 1.5Y2O3·2.5aAl2O3:Ce where a is a number satisfying 1.02<a<1.1.Type: GrantFiled: December 6, 2017Date of Patent: May 11, 2021Assignees: Kabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.Inventors: Yoshitaka Funayama, Yumi Kanno, Hirofumi Takemura, Tsutomu Ishii, Yasuhiro Shirakawa
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Patent number: 10957826Abstract: According to one embodiment, a white light source includes a combination of a light emitting diode and phosphors. One of the phosphors is at least a cerium activated yttrium aluminum garnet-based phosphor. There is no light emission spectrum peak at which a ratio of a largest maximum value to a minimum value is greater than 1.9. The largest maximum value is largest among at least one maximum value present in a wavelength range of 400 nm to 500 nm in a light emission spectrum of white light emitted from the white light source. The minimum value is adjacent to the largest maximum value in a longer wavelength side of the light emission spectrum.Type: GrantFiled: November 20, 2018Date of Patent: March 23, 2021Assignees: Kabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.Inventors: Tatsunori Itoga, Ryoji Tsuda, Naotoshi Matsuda, Yoshitaka Funayama
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Publication number: 20190088833Abstract: According to one embodiment, a white light source includes a combination of a light emitting diode and phosphors. One of the phosphors is at least a cerium activated yttrium aluminum garnet-based phosphor. There is no light emission spectrum peak at which a ratio of a largest maximum value to a minimum value is greater than 1.9. The largest maximum value is largest among at least one maximum value present in a wavelength range of 400 nm to 500 nm in a light emission spectrum of white light emitted from the white light source. The minimum value is adjacent to the largest maximum value in a longer wavelength side of the light emission spectrum.Type: ApplicationFiled: November 20, 2018Publication date: March 21, 2019Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA MATERIALS CO., LTD.Inventors: Tatsunori ITOGA, Ryoji TSUDA, Naotoshi MATSUDA, Yoshitaka FUNAYAMA
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Publication number: 20180138374Abstract: A phosphor has a composition represented by Chemical formula 1: 1.5Y2O3.2.5aAl2O3:Ce where a is a number satisfying 1.02<a<1.1.Type: ApplicationFiled: December 6, 2017Publication date: May 17, 2018Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA MATERIALS CO., LTD.Inventors: Yoshitaka FUNAYAMA, Yumi KANNO, Hirofumi TAKEMURA, Tsutomu ISHll, Yasuhiro SHIRAKAWA
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Patent number: 9660149Abstract: An LED light emitting device is provided that has high color rendering properties and is excellent color uniformity and, at the same time, can realize even luminescence unattainable by conventional techniques. A phosphor having a composition represented by formula: (Sr2-X-Y-Z-?BaXMgYMnZEu?)SiO4 wherein x, y, z, and ? are respectively coefficients satisfying 0.1<x<1, 0<y<0.5, 0<z<0.1, y>z, and 0.01<?<0.2 is provided. The phosphor is used in combination with ultraviolet and blue light emitting diodes having a luminescence peak wavelength of 360 to 470 nm to form an LED light emitting device.Type: GrantFiled: October 23, 2015Date of Patent: May 23, 2017Assignees: Kabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.Inventors: Tsutomu Ishii, Yoshitaka Funayama, Yumi Ito, Yasumasa Ooya, Ryo Sakai, Katsutoshi Nakagawa, Hajime Takeuchi, Yasuhiro Shirakawa
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Publication number: 20160049558Abstract: An LED light emitting device is provided that has high color rendering properties and is excellent color uniformity and, at the same time, can realize even luminescence unattainable by conventional techniques. A phosphor having a composition represented by formula: (Sr2-X-Y-Z-?BaXMgYMnZEu?)SiO4 wherein x, y, z, and ? are respectively coefficients satisfying 0.1<x<1, 0<y<0.5, 0<z<0.1, y>z, and 0.01<?<0.2 is provided. The phosphor is used in combination with ultraviolet and blue light emitting diodes having a luminescence peak wavelength of 360 to 470 nm to form an LED light emitting device.Type: ApplicationFiled: October 23, 2015Publication date: February 18, 2016Inventors: Tsutomu Ishii, Yoshitaka Funayama, Yumi Ito, Yasumasa Ooya, Ryo Sakai, Katsutoshi Nakagawa, Hajime Takeuchi, Yasuhiro Shirakawa
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Patent number: 9231150Abstract: A phosphor for light emitting device of an embodiment includes: a phosphor particle composed of at least one selected from an alkaline earth silicate phosphor, a lanthanum oxysulfide phosphor, and a zinc sulfide phosphor; and a surface treatment agent, provided to cover a surface of the phosphor particle, of at least one selected from a silane coupling agent and an acrylic emulsion. A luminance maintenance ratio of the phosphor represented by a formula: luminance B/luminance A×100(%), is 98% or more, wherein the luminance A is a luminance of the phosphor made to emit under a condition of temperature: 23° C., humidity: 40%, and the luminance B is a luminance of the phosphor made to emit under a condition of temperature: 23° C., humidity: 40% after leaving the phosphor under a condition of temperature: 60° C., humidity: 90% for 12 hours.Type: GrantFiled: September 13, 2013Date of Patent: January 5, 2016Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA MATERIALS CO., LTD.Inventors: Yoshitaka Funayama, Hirofumi Takemura
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Patent number: 9169436Abstract: An LED light emitting device is provided that has high color rendering properties and is excellent color uniformity and, at the same time, can realize even luminescence unattainable by conventional techniques. A phosphor having a composition represented by formula: (Sr2-X-Y-Z-?BaXMgYMnZEu?)SiO4 wherein x, y, z, and ? are respectively coefficients satisfying 0.1<x<1, 0<y<0.5, 0<z<0.1, y>z, and 0.01<?<0.2 is provided. The phosphor is used in combination with ultraviolet and blue light emitting diodes having a luminescence peak wavelength of 360 to 470 nm to form an LED light emitting device.Type: GrantFiled: May 14, 2012Date of Patent: October 27, 2015Assignee: Kabushiki Kaisha ToshibaInventors: Tsutomu Ishii, Yoshitaka Funayama, Yumi Ito, Yasumasa Ooya, Ryo Sakai, Katsutoshi Nakagawa, Hajime Takeuchi, Yasuhiro Shirakawa
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Patent number: 8933475Abstract: A light emitting device 1 according to an embodiment includes a planar alumina substrate, a semiconductor light-emitting element mounted on the alumina substrate, and a phosphor layer. The phosphor layer includes a silicone resin layer provided to cover an upper surface and a side surface of the semiconductor light-emitting element and a phosphor emitting visible light by being excited with light emitted from the semiconductor light-emitting element. The phosphor is dispersed in the silicone resin layer. The alumina substrate has a water absorption rate of 5% or more and 60% or less, and an adhesion strength between the alumina substrate and the silicone resin layer is 1 N or more.Type: GrantFiled: September 11, 2012Date of Patent: January 13, 2015Assignees: Kabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.Inventors: Katsutoshi Nakagawa, Yasumasa Ooya, Yoshitaka Funayama, Daichi Usui
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Publication number: 20140008690Abstract: A phosphor for light emitting device of an embodiment includes: a phosphor particle composed of at least one selected from an alkaline earth silicate phosphor, a lanthanum oxysulfide phosphor, and a zinc sulfide phosphor; and a surface treatment agent, provided to cover a surface of the phosphor particle, of at least one selected from a silane coupling agent and an acrylic emulsion. A luminance maintenance ratio of the phosphor represented by a formula: luminance B/luminance A×100(%) , is 98% or more, wherein the luminance A is a luminance of the phosphor made to emit under a condition of temperature: 23° C., humidity: 40%, and the luminance B is a luminance of the phosphor made to emit under a condition of temperature: 23° C., humidity: 40% after leaving the phosphor under a condition of temperature: 60° C., humidity: 90% for 12 hours.Type: ApplicationFiled: September 13, 2013Publication date: January 9, 2014Applicants: TOSHIBA MATERIALS CO., LTD., KABUSHIKI KAISHA TOSHIBAInventors: Yoshitaka FUNAYAMA, Hirofumi TAKEMURA
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Publication number: 20130240915Abstract: A light emitting device 1 according to an embodiment includes a planar alumina substrate, a semiconductor light-emitting element mounted on the alumina substrate, and a phosphor layer. The phosphor layer includes a silicone resin layer provided to cover an upper surface and a side surface of the semiconductor light-emitting element and a phosphor emitting visible light by being excited with light emitted from the semiconductor light-emitting element. The phosphor is dispersed in the silicone resin layer. The alumina substrate has a water absorption rate of 5% or more and 60% or less, and an adhesion strength between the alumina substrate and the silicone resin layer is 1 N or more.Type: ApplicationFiled: September 11, 2012Publication date: September 19, 2013Applicants: TOSHIBA MATERIALS CO., LTD., KABUSHIKI KAISHA TOSHIBAInventors: Katsutoshi Nakagawa, Yasumasa Ooya, Yoshitaka Funayama, Daichi Usui
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Patent number: 8487330Abstract: An LED light emitting device is provided that has high color rendering properties and is excellent color uniformity and, at the same time, can realize even luminescence unattainable by conventional techniques. A phosphor having a composition represented by formula: (Sr2-X-Y-Z-?BaXMgYMnZEu?)SiO4 wherein x, y, z, and ? are respectively coefficients satisfying 0.1<x<1, 0<y<0.5, 0<z<0.1, y>z, and 0.01<?<0.2 is provided. The phosphor is used in combination with ultraviolet and blue light emitting diodes having a luminescence peak wavelength of 360 to 470 nm to form an LED light emitting device.Type: GrantFiled: December 4, 2008Date of Patent: July 16, 2013Assignees: Kabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.Inventors: Tsutomu Ishii, Yoshitaka Funayama, Yumi Ito, Yasumasa Ooya, Ryo Sakai, Katsutoshi Nakagawa, Hajime Takeuchi, Yasuhiro Shirakawa
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Patent number: 8377335Abstract: 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: GrantFiled: February 22, 2010Date of Patent: February 19, 2013Assignees: Kabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.Inventors: Yukihiro Fukuta, Hiroyasu Oota, Tsutomu Ishii, Yoshitaka Funayama
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Publication number: 20120223352Abstract: An LED light emitting device is provided that has high color rendering properties and is excellent color uniformity and, at the same time, can realize even luminescence unattainable by conventional techniques. A phosphor having a composition represented by formula: (Sr2-X-Y-Z-?BaXMgYMnZEu?)SiO4 wherein x, y, z, and u are respectively coefficients satisfying 0.1<x<1, 0<y<0.5, 0<z<0.1, y>z, and 0.01<?<0.2. is provided. The phosphor is used in combination with ultraviolet and blue light emitting diodes having a luminescence peak wavelength of 360 to 470 nm to form an LED light emitting device.Type: ApplicationFiled: May 14, 2012Publication date: September 6, 2012Applicants: Toshiba Materials Co., Ltd., Kabushiki Kaisha ToshibaInventors: Tsutomu ISHII, Yoshitaka FUNAYAMA, Yumi ITO, Yasumasa OOYA, Ryo SAKAI, Katsutoshi NAKAGAWA, Hajime TAKEUCHI, Yasuhiro SHIRAKAWA
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Publication number: 20110303873Abstract: 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: ApplicationFiled: February 22, 2010Publication date: December 15, 2011Applicants: Toshiba Materials Co., Ltd., Kabushiki Kaisha ToshibaInventors: Yukihiro Fukuta, Hiroyasu Oota, Tsutomu Ishii, Yoshitaka Funayama
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Publication number: 20110006325Abstract: An LED light emitting device is provided that has high color rendering properties and is excellent color uniformity and, at the same time, can realize even luminescence unattainable by conventional techniques. A phosphor having a composition represented by formula: (Sr2-X-Y-Z-?BaXMgYMnZEu?)SiO4 wherein x, y, z, and ? are respectively coefficients satisfying 0.1<x<1, 0<y<0.5, 0<z<0.1, y>z, and 0.01<?<0.2 is provided. The phosphor is used in combination with ultraviolet and blue light emitting diodes having a luminescence peak wavelength of 360 to 470 nm to form an LED light emitting device.Type: ApplicationFiled: December 4, 2008Publication date: January 13, 2011Inventors: Tsutomu Ishii, Yoshitaka Funayama, Yumi Ito, Yasumasa Ooya, Ryo Sakai, Katsutoshi Nakagawa, Hajime Takeuchi, Yasuhiro Shirakawa
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Publication number: 20070159058Abstract: A phosphor particle includes a phosphor containing zinc sulfide as a base material, and a coating layer applied on the phosphor and made of a magnesium phosphate expressed by Mg3(PO4)2.Type: ApplicationFiled: December 13, 2006Publication date: July 12, 2007Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Iwao Mitsuishi, Hironori Asai, Nobuyuki Yokosawa, Masaaki Inamura, Yoshitaka Funayama