Patents by Inventor Yumi Fukuda
Yumi Fukuda 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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Publication number: 20120056525Abstract: A light emitting device according to one embodiment includes a light emitting element that emits light having a wavelength of 250 nm to 500 nm; plural red fluorescent layers that are formed above the light emitting element to include a red fluorescent material, the red fluorescent layers being disposed at predetermined intervals; and plural green fluorescent layers that are formed above the light emitting element to include a green fluorescent material, a distance between the light emitting element and the green fluorescent layers being larger than a distance between the light emitting element and the red fluorescent layers.Type: ApplicationFiled: February 24, 2011Publication date: March 8, 2012Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Kunio ISHIDA, Iwao MITSUISHI, Ryosuke HIRAMATSU, Yumi FUKUDA, Keiko ALBESSARD, Naotoshi MATSUDA, Aoi OKADA, Shinya NUNOUE
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Publication number: 20120056526Abstract: A light emitting device according to one embodiment includes a light emitting element that emits light having a wavelength of 380 nm to 470 nm; a CASN first red phosphor that is disposed on the light emitting element; a sialon second red phosphor that is disposed on the light emitting element; and a sialon green phosphor that is disposed on the light emitting element.Type: ApplicationFiled: February 24, 2011Publication date: March 8, 2012Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Iwao MITSUISHI, Shinya Nunoue, Takahiro Sato, Yumi Fukuda, Aoi Okada, Naotoshi Matsuda, Toshiki Hikosaka
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Publication number: 20120057339Abstract: A light emitting device according to one embodiment includes: a board; plural first light emitting units each including a first light emitting element and a first fluorescent layer formed on the first light emitting element having a green phosphor; plural second light emitting units each including a second light emitting element and a second fluorescent layer formed on the second light emitting element having a red phosphor; the second fluorescent layers and the first fluorescent layers being separated in a non-contact manner with gas interposed there between; and plural third light emitting units each including a third light emitting element and a resin layer formed on the third light emitting element having neither a green phosphor nor the red phosphor, the third light emitting units being disposed between the first light emitting units and the second light emitting units.Type: ApplicationFiled: February 24, 2011Publication date: March 8, 2012Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Iwao Mitsuishi, Yumi Fukuda, Aoi Okada, Naotoshi Matsuda, Shinya Nunoue
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Publication number: 20120056527Abstract: A light emitting device according to one embodiment includes a board; a light emitting element mounted on the board, emitting light having a wavelength of 250 nm to 500 nm; a red fluorescent layer formed on the element, including a red phosphor expressed by equation (1), having a semicircular shape with a diameter r; (M1?x1Eux1)aSibAlOcNd??(1) (In the equation (1), M is an element that is selected from IA group elements, IIA group elements, IIIA group elements, IIIB group elements except Al (Aliminum), rare-earth elements, and IVB group elements), an intermediate layer formed on the red fluorescent layer, being made of transparent resin, having a semicircular shape with a diameter D; and a green fluorescent layer formed on the intermediate layer, including a green phosphor, having a semicircular shape. A relationship between the diameter r and the diameter D satisfies equation (2): 2.0r (?m)?D(r+1000) (?m).Type: ApplicationFiled: February 24, 2011Publication date: March 8, 2012Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Iwao MITSUISHI, Kunio ISHIDA, Yumi FUKUDA, Aoi OKADA, Naotoshi MATSUDA, Keiko ALBESSARD, Shinya NUNOUE
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Publication number: 20120056209Abstract: A light emitting device according to one embodiment includes a board; plural first light emitting elements mounted on the board to emit light having a wavelength of 250 nm to 500 nm; plural second light emitting elements mounted on the board to emit light having a wavelength of 250 nm to 500 nm; a first fluorescent layer formed on each of the first light emitting elements, the first fluorescent layer including a first phosphor; and a second fluorescent layer formed on each of the second light emitting elements, the second fluorescent layer including a second phosphor. The second phosphor is higher than the first phosphor in luminous efficiency at 50° C., and is lower than the first phosphor in the luminous efficiency at 150° C.Type: ApplicationFiled: August 22, 2011Publication date: March 8, 2012Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Iwao MITSUISHI, Yumi Fukuda, Aoi Okada, Ryosuke Hiramatsu, Naotoshi Matsuda, Shinya Nunoue, Keiko Albessard, Masahiro Kato
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Publication number: 20120056225Abstract: A light emitting device according to one embodiment includes a board; a light emitting element mounted on the board, emitting light having a wavelength of 250 nm to 500 nm; a red fluorescent layer formed on the element, including a red phosphor expressed by equation (1), having a semicircular shape with a diameter r; (M1?x1Eux1)aSibAlOcNd??(1) (In the equation (1), M is an element that is selected from IA group elements, IIA group elements, IIIA group elements, IIIB group elements except Al (Aliminum), rare-earth elements, and IVB group elements), an intermediate layer formed on the red fluorescent layer, being made of transparent resin, having a semicircular shape with a diameter D; and a green fluorescent layer formed on the intermediate layer, including a green phosphor, having a semicircular shape. A relationship between the diameter r and the diameter D satisfies equation (2): 2.0r(?m)?D?(r+1000)(?m).Type: ApplicationFiled: August 22, 2011Publication date: March 8, 2012Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Iwao MITSUISHI, Kunio Ishida, Yumi Fukuda, Aoi Okada, Naotoshi Matsuda, Keiko Albessard, Shinya Nunoue, Masahiro Kato
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Publication number: 20120056216Abstract: A light emitting device according to one embodiment includes: a board; plural first light emitting units each including a first light emitting element and a first fluorescent layer formed on the first light emitting element having a green phosphor; plural second light emitting units each including a second light emitting element and a second fluorescent layer formed on the second light emitting element having a red phosphor; the second fluorescent layers and the first fluorescent layers being separated in a non-contact manner with gas interposed there between; and plural third light emitting units each including a third light emitting element and a resin layer formed on the third light emitting element having neither a green phosphor nor the red phosphor, the third light emitting units being disposed between the first light emitting units and the second light emitting units.Type: ApplicationFiled: August 22, 2011Publication date: March 8, 2012Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Iwao MITSUISHI, Yumi FUKUDA, Aoi OKADA, Naotoshi MATSUDA, Shinya NUNOUE, Keiko ALBESSARD, Masahiro KATO
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Publication number: 20120057338Abstract: A light emitting device according to one embodiment includes a board; plural first light emitting elements mounted on the board to emit light having a wavelength of 250 nm to 500 nm; plural second light emitting elements mounted on the board to emit light having a wavelength of 250 nm to 500 nm; a first fluorescent layer formed on each of the first light emitting elements, the first fluorescent layer including a first phosphor; and a second fluorescent layer formed on each of the second light emitting elements, the second fluorescent layer including a second phosphor. The second phosphor is higher than the first phosphor in luminous efficiency at 50° C., and is lower than the first phosphor in the luminous efficiency at 150° C.Type: ApplicationFiled: February 24, 2011Publication date: March 8, 2012Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Iwao Mitsuishi, Yumi Fukuda, Aoi Okada, Ryosuke Hiramatsu, Naotoshi Matsuda, Shinya Nunoue
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Publication number: 20120049115Abstract: The embodiment provides a process for production of an oxynitride fluorescent substance. In the process, a compound represented by the formula: (Sr,Eu)2Si5N8, silicon nitride and aluminum nitride are mixed and then fired in a nitrogen atmosphere under high pressure.Type: ApplicationFiled: February 28, 2011Publication date: March 1, 2012Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Naotoshi MATSUDA, Yumi FUKUDA, Masahiro KATO
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Publication number: 20120043569Abstract: A light emitting device according to one embodiment includes a light emitting element that emits light having a wavelength of 250 nm to 500 nm and a fluorescent layer that is disposed on the light emitting element. The fluorescent layer includes a phosphor having a composition expressed by the following equation (1) and an average particle diameter of 12 ?m or more. (M1?x1Eux1)3?ySi13?zAl3+zO2+uN21?w??(1) (In the equation (1), M is an element that is selected from IA group elements, IIA group elements, IIIA group elements, IIIB group elements except Al, rare-earth elements, and IVB group elements. x1, y, z, u, and w satisfy the following relationship. 0<x1?1, ?0.1?y?0.15, ?1?z?1, ?1<u?w?1.Type: ApplicationFiled: February 24, 2011Publication date: February 23, 2012Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Iwao MITSUISHI, Yumi Fukuda, Aoi Okada, Naotoshi Matsuda, Shinya Nunoue
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Publication number: 20120043573Abstract: A light emitting device according to one embodiment includes a light emitting element that emits light having a wavelength of 250 nm to 500 nm and a fluorescent layer that is disposed on the light emitting element. The fluorescent layer includes a phosphor having a composition expressed by the following equation (1) and an average particle diameter of 12 ?m or more. (M1?x1Eux1)3?ySi13?zAl3+zO2+uN21?w??(1) (In the equation (1), M is an element that is selected from IA group elements, IIA group elements, IIIA group elements, IIIB group elements except Al, rare-earth elements, and IVB group elements. x1, y, z, u, and w satisfy the following relationship. 0<x1<1, ?0.1<y<0.3, ?3<z?1, ?3<u?w?1.Type: ApplicationFiled: August 22, 2011Publication date: February 23, 2012Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Iwao MITSUISHI, Yumi FUKUDA, Aoi OKADA, Naotoshi MATSUDA, Shinya NUNOUE, Keiko ALBESSARD, Masahiro KATO
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Publication number: 20120037849Abstract: The present invention provides a fluorescent substance excellent both in quantum efficiency and in temperature characteristics, and also provides a process for producing the fluorescent substance. This fluorescent substance is an oxynitride phosphor having a low paramagnetic defect density and comprising aluminum, silicon, either or both of oxygen and nitrogen, and a metal element M, provided that the metal element M is partly replaced with an emission center element R. That phosphor can be produced by the steps of: subjecting a mixture of starting materials to heat treatment under a nitrogen atmosphere so as to obtain an intermediate fired product, and then further subjecting the intermediate fired product to heat treatment under an atmosphere of nitrogen-hydrogen mixed gas.Type: ApplicationFiled: August 24, 2011Publication date: February 16, 2012Applicant: Kabushiki Kaisha ToshibaInventors: Yumi Fukuda, Naotoshi Matsuda, Ryosuke Hiramatsu
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Patent number: 8105502Abstract: A luminescent material is provided, which includes a carbide oxynitride-based compound having a composition represented by formula 1: (M1?wRw)uAl1?xSi1+vOzNtCy??formula 1 wherein M is at least one metal element excluding Si and Al, and R is a luminescent central element. w, u, x, v, z, t and y satisfy following relationships: 0.001<w<0.5; 0.66?u?1; 0.07?x?0.73; 0.06?v?0.84; 0.04?z?0.44; 2.7?t?3.1; and 0.019?y?0.13.Type: GrantFiled: September 17, 2008Date of Patent: January 31, 2012Assignee: Kabushiki Kaisha ToshibaInventors: Yumi Fukuda, Jun-ichi Tatami, Hironori Asai, Katsutoshi Komeya, Naotoshi Matsuda, Toru Wakihara, Keiko Albessard, Shoko Abe
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Publication number: 20110220919Abstract: The embodiment provides a process for production of an oxynitride fluorescent substance. An compound containing In or Ga is adopted in the process as a material thereof. The red fluorescent substance produced by the process can be combined with a semiconductor light-emitting element, so as to be used in a light-emitting device or a light-emitting module.Type: ApplicationFiled: September 3, 2010Publication date: September 15, 2011Applicant: Kabushiki Kaisha ToshibaInventors: Aoi OKADA, Yumi Fukuda, Takahiro Sato, Iwao Mitsuishi, Naotoshi Matsuda, Ryosuke Hiramatsu, Kunio Ishida
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Publication number: 20110204769Abstract: The embodiment provides a process for production of a green light-emitting oxynitride fluorescent material having Sr3Al3Si13O2N21 crystal structure, and also provides the fluorescent material produced by that process. An metal halide is adopted in the process as one of the starting material metal compounds. As the metal halide, a Ca or Na compound as well as a Sr compound can be preferably employed.Type: ApplicationFiled: August 26, 2010Publication date: August 25, 2011Applicant: Kabushiki Kaisha ToshibaInventors: Yumi FUKUDA, Aoi Okada, Naotoshi Matsuda
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Publication number: 20110058583Abstract: A luminescent material which is featured in that it exhibits an emission peak at a wavelength ranging from 490 to 580 nm as it is excited by light having a wavelength ranging from 250 to 500 nm and that it has a composition represented by the following general formula (2): (M1-xRx)a2AlSib2Oc2Nd2??(2) (In the general formula (2), M is at least one metallic element excluding Si and Al, R is a luminescence center element, and x, a2, b2, c2 and d2 satisfy the following relationships: 0<x?1, 0.93<a2<1.3, 4.0<b2<5.8 0.6<c2<1, 6<d2<11).Type: ApplicationFiled: November 12, 2010Publication date: March 10, 2011Inventors: Yumi FUKUDA, Masaaki Tamanani, Katsuko Tamatani, Hironori Asai, Ryosuke Hiramatsu, Junichi Tatami, Katsutoshi Komeya, Toru Wakihara
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Publication number: 20110058582Abstract: A luminescent material which is featured in that it exhibits an emission peak at a wavelength ranging from 490 to 580 nm as it is excited by light having a wavelength ranging from 250 to 500 nm and that it has a composition represented by the following general formula (2): (M1-xRx)a2AlSib2Oc2Nd2??(2) (In the general formula (2), M is at least one metallic element excluding Si and Al, R is a luminescence center element, and x, a2, b2, c2 and d2 satisfy the following relationships: 0<x?1, 0.93<a2<1.3, 4.0<b2<5.8 0.6<c2<1, 6<d2<11).Type: ApplicationFiled: November 12, 2010Publication date: March 10, 2011Inventors: Yumi FUKUDA, Masaaki Tamatani, Katsuko Tamatani, Hironori Asai, Ryosuke Hiramatsu, Junichi Tatami, Katsutoshi Komeya, Toru Wakihara
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Publication number: 20110057149Abstract: A luminescent material which is featured in that it exhibits an emission peak at a wavelength ranging from 490 to 580 nm as it is excited by light having a wavelength ranging from 250 to 500 nm and that it has a composition represented by the following general formula (2): (M1-xRx)a2AlSib2Oc2Nd2 ??(2) (In the general formula (2), M is at least one metallic element excluding Si and Al, R is a luminescence center element, and x, a2, b2, c2 and d2 satisfy the following relationships: 0<x?1, 0.93<a2<1.3, 4.0<b2<5.8 0.6<c2<1, 6<d2<11).Type: ApplicationFiled: November 12, 2010Publication date: March 10, 2011Inventors: Yumi FUKUDA, Masaaki Tamanani, Katsuko Tamatani, Hironori Asai, Ryosuke Hiramatsu, Junichi Tatami, Katsutoshi Komeya, Toru Wakihara
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Publication number: 20100102707Abstract: The present invention provides a red fluorescent substance and a light-emitting device utilizing the substance. This device less suffers from color drift even when working with high power. The light-emitting device comprises a blue LED, a green fluorescent substance of Sr3Al3Si13O2N21 activated with a luminescent center, and the red fluorescent substance. The red fluorescent substance contains an inorganic compound comprising a metal element M, a trivalent element M1 other than the M, a tetravalent element M2 other than the M, and nitrogen element. In the inorganic compound, the M is partly replaced with a luminescent center element EC. The red fluorescent substance has basically the same crystal structure as Sr2Al3Si7ON13. The red fluorescent substance emits luminescence having a peak in the range of 580 to 650 nm when excited with light of 250 to 500 nm.Type: ApplicationFiled: October 27, 2009Publication date: April 29, 2010Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Yumi FUKUDA, Naotoshi MATSUDA
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Publication number: 20100025632Abstract: The present invention provides a fluorescent substance excellent both in quantum efficiency and in temperature characteristics, and also provides a light-emitting device utilizing the fluorescent substance. This fluorescent substance contains an inorganic compound comprising a metal element M, a trivalent element M1 other than the metal element M, a tetravalent element M2 other than the metal element M, and either or both of O and N. In the inorganic compound, the metal element M is partly replaced with a luminescence center element R. The crystal structure of the fluorescent substance is basically the same as Sr3Al3Si13O2N21, but the chemical bond lengths of M1-N and M2-N are within the range of ±15% based on those of Al—N and Si—N calculated from the lattice constants and atomic coordinates of Sr3Al3Si13O2N21, respectively. The fluorescent substance emits luminescence having a peak in the range of 490 to 580 nm when excited with light of 250 to 500 nm.Type: ApplicationFiled: July 16, 2009Publication date: February 4, 2010Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Yumi FUKUDA, Hironori ASAI