Patents by Inventor Yasumasa Ooya
Yasumasa Ooya 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: 7935975Abstract: Disclosed is a white LED lamp using an ultraviolet light emitting LED, which can simultaneously realize a high level of color rendering and a high level of brightness. Included is an LED chip 2 having a luminescence wavelength between 360 nm and 440nm, and a light emitting part excitable upon exposure to light from the LED chip 2 to emit white light and comprising a phosphor, the phosphor including blue, green, and red light emitting phosphors bonded to each other. A phosphor selected from europium-activated halophosphate phosphors and europium-activated aluminate phosphors is used as the blue light emitting phosphor. A gold- and aluminum-activated zinc sulfide phosphor is used as the green light emitting phosphor. A phosphor selected from europium- and samarium-activated lanthanum oxysulfide phosphors and copper- and manganese-activated zinc sulfide phosphors is used as the red light emitting phosphor.Type: GrantFiled: September 12, 2006Date of Patent: May 3, 2011Assignees: Kabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.Inventors: Tsutomu Ishii, Yasuhiro Shirakawa, Hajime Takeuchi, Ryo Sakai, Yasumasa Ooya
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Patent number: 7936418Abstract: A white light-emitting device 1 includes a semiconductor light-emitting element 2 emitting ultraviolet light or violet light, and a light-emitting unit 10 which includes three or more kinds of visible light-emitting phosphors 9 and emits white light when excited by the light from the semiconductor light-emitting element 2. The emission spectrum of the light-emitting unit 10 has peaks in a blue region of not less than 440 nm nor more than 460 nm, a green region of not less than 510 nm nor more than 530 nm, and a red region of not less than 620 nm nor more than 640 nm, and the three or more kinds of visible light-emitting phosphors 9 are bound together with a binder in advance.Type: GrantFiled: September 28, 2006Date of Patent: May 3, 2011Assignees: Kabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.Inventors: Tsutomu Ishii, Yasuhiro Shirakawa, Hajime Takeuchi, Yasumasa Ooya, Ryo Sakai
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Publication number: 20110073899Abstract: A white light source includes: an insulating substrate; a light-emitting diode chip provided on the insulating substrate and that emits ultraviolet light with a wavelength of 330 nm to 410 nm; and a phosphor layer formed to cover the light-emitting diode chip, including a red emitting phosphor, a green emitting phosphor, and a blue emitting phosphor as a phosphor, and the phosphors are dispersed in a cured transparent resin, wherein when it is assumed that the shortest distance between a surface of the phosphor layer and a peripheral portion of the light-emitting diode chip is t(mm) and the mean free path defined by the following expression (1) is L(mm), the t and L satisfy 3.2?t/L. [Expression 1] L=1/(nĂ—?)??(1) (n: number of phosphors per unit volume of the phosphor layer (pcs/mm3), and ?: average cross section area of a phosphor in the phosphor layer (mm2)).Type: ApplicationFiled: May 28, 2009Publication date: March 31, 2011Applicant: TOSHIBA MATERIALS CO., LTDInventors: Tetsuo Inoue, Hajime Takeuchi, Yasumasa Ooya, Toshio Shimaoogi, Yasuhiro Shirakawa
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Publication number: 20110031523Abstract: A white light emitting device includes a blue light emitting diode chip that emits blue light in a specific wavelength band, a first resin layer that seals the blue light emitting diode chip and includes a cured product of silicone resin, and a second resin layer that covers the first resin layer and includes phosphor powder, which absorbs the blue light and emits light in a specific wavelength band, and a cured product of transparent resin. The phosphor powder has a composition represented by the following Formula (1): (Sr1-x-yBaxEuy)2SiO4 ??(1) (in Formula (1), x and y satisfy a condition that 0.05<x<0.5 and 0.05<y<0.3.) The first resin layer has thickness within a range of 200 ?m to 2000 ?m. The white light emitting device has high luminance for a long period.Type: ApplicationFiled: April 15, 2009Publication date: February 10, 2011Applicants: Kabushiki Kaisha Toshiba, TOSHIBA MATERIALS CO., LTD.Inventors: Tsutomu Ishii, Hajime Takeuchi, Ryo Sakai, Yasumasa Ooya, Yasuhiro Shirakawa
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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: 20110006334Abstract: A white LED lamp including: a conductive portion; a light emitting diode chip mounted on the conductive portion, for emitting a primary light having a peak wavelength of 360 nm to 420 nm; a transparent resin layer including a first hardened transparent resin, for sealing the light emitting diode chip; and a phosphor layer covering the transparent resin layer, the phosphor layer being formed by dispersing a phosphor powder into a second hardened transparent resin, and the phosphor powder receiving the primary light and radiating a secondary light having a wavelength longer than that of the primary light. An energy of the primary light contained in the radiated secondary light is 0.4 mW/lm or less. In the white LED lamp, a backlight, and an illumination device using the white LED lamp an amount of UV light to be contained in the released light and an amount of heat to be generated from the lamp are decreased to be small.Type: ApplicationFiled: February 19, 2009Publication date: January 13, 2011Applicants: Kabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.Inventors: Tsutomu Ishii, Hajime Takeuchi, Yasumasa Ooya, Katsutoshi Nakagawa, Yumi Ito, Masaki Toyoshima, Yasuhiro Shirakawa, Ryo Sakai
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Patent number: 7857992Abstract: A white light-emitting lamp (1) includes a semiconductor light-emitting device such as a LED chip (2) which has an emission wavelength of 360 nm or more and 440 nm or less, and a light-emitting part including a blue light-emitting phosphor, a green light-emitting phosphor and a red light-emitting phosphor, which emits white light when excited by light from the LED chip (2). At least one phosphor selected from Eu activated halophosphate phosphors and Eu activated aluminate phosphors is used as the blue light-emitting phosphor, Au and Al activated zinc sulfide phosphor is used as the green light-emitting phosphor, and at least one phosphor selected from Eu and Sm activated lanthanum sulfide phosphors and Cu and Mn activated zinc sulfide phosphors is used as the red light-emitting phosphor.Type: GrantFiled: February 24, 2006Date of Patent: December 28, 2010Assignees: Kabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.Inventors: Tsutomu Ishii, Yasuhiro Shirakawa, Yasumasa Ooya
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Publication number: 20100322275Abstract: A white light-emitting lamp (1) includes a light-emitting portion (9) which is excited by light emitted from a semiconductor light-emitting element (2) to emit white light. The light-emitting portion (9) contains a blue phosphor, a yellow phosphor and a red phosphor. The yellow phosphor is composed of a europium and manganese-activated alkaline earth silicate phosphor having a composition expressed by (Sr1-x-y-z-u, Bax, Mgy, Euz, Mnu)2SiO4 (0.1?x?0.35, 0.025?y?0.105, 0.025?z?0.25, 0.0005?u?0.02).Type: ApplicationFiled: February 7, 2008Publication date: December 23, 2010Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA MATERIALS CO., LTD.Inventors: Tsutomu Ishii, Yasuhiro Shirakawa, Ryo Sakai, Yasumasa Ooya, Hajime Takeuchi
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Publication number: 20100225849Abstract: A light emitting module 1 includes a substrate 2 having a metal pattern 4 and a plurality of white light emitting devices 3 linearly arranged on the substrate 2. The metal pattern 4 is formed on a portion of 60% or more of an area of the substrate 2. The white light emitting device 3 includes a light emitting diode as a semiconductor light emitting element 5. Light emitted from the semiconductor light emitting element 5 is converted into white light by a light emitting section containing phosphors, and is taken out. The light emitting module 1 emits white light.Type: ApplicationFiled: January 17, 2007Publication date: September 9, 2010Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA MATERIALS CO., LTD.Inventors: Hajime Takeuchi, Ryo Sakai, Yasumasa Ooya, Tsutomu Ishii, Yasuhiro Shirakawa
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Patent number: 7709855Abstract: A light-emitting device includes a semiconductor light-emitting element arranged on a substrate having internal wiring, a reflector arranged around the semiconductor light-emitting element, and a light-emitting portion, filled in the reflector, having a phosphor which emits visible light when excited by light from the semiconductor light-emitting element. Electrical conduction to the light-emitting element is obtained via the internal wiring of the substrate and the reflector.Type: GrantFiled: August 22, 2006Date of Patent: May 4, 2010Assignees: Kabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.Inventors: Yasumasa Ooya, Ryo Sakai, Hajime Takeuchi, Tsutomu Ishii, Yasuhiro Shirakawa
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Publication number: 20100102340Abstract: The present invention provides a semiconductor light emitting device comprising a light intensity difference reducing layer provided between an ultraviolet semiconductor light emitting element and a wavelength converting material layer, and a backlight and a display device comprising the semiconductor light emitting device. The semiconductor light emitting device is an LED light emitting device which has improved uniformity of emitted light and reduced non-uniformity of brightness and chromaticity of emitted light.Type: ApplicationFiled: September 27, 2007Publication date: April 29, 2010Inventors: Yasumasa Ooya, Ryo Sakai, Hajime Takeuchi, Tsutomi Ishii
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Patent number: 7649310Abstract: The present invention provides a white LED comprising: an ultraviolet emitting diode or a purple light emitting diode; and phosphors for emitting at least three visible lights including blue light, green light and red light; wherein an emission spectrum of the white LED has: a first luminescence peak in a blue light region having a wavelength of 440-460 nm; a second luminescence peak in a green light region having a wavelength of 510-530 nm; and a third luminescence peak in a red light region having a wavelength of 620-640 nm. Further, it is preferable that a half bandwidth of each of the luminescence peaks is 50 nm or less. As a result, there can be provided a white LED, backlight and liquid crystal display using the white LED exhibiting a high luminance and an excellent color reproducing property.Type: GrantFiled: December 20, 2005Date of Patent: January 19, 2010Assignees: Kabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.Inventors: Tsutomu Ishii, Hajime Takeuchi, Yasuhiro Shirakawa, Yasumasa Ooya, Ryo Sakai, Masahiko Yamakawa
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Patent number: 7639318Abstract: A backlight unit 1 includes a plurality of light emitting devices 2 constituted with, for example, LED lamps, and an optical sheet 4 disposed on light emission surface 2b sides of the light emitting devices 2. The light emission surface sides of the plural light emitting devices are joined to the optical sheet 4 via joining layers 5. The backlight unit 1 satisfies a condition of n1?n2?n3, where n1 is a refractive index of the optical sheet 4, n2 is a refractive index of the joining layer 5, and n3 is a refractive index of the light emitting device 2.Type: GrantFiled: July 4, 2006Date of Patent: December 29, 2009Assignees: Kabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.Inventors: Hajime Takeuchi, Ryo Sakai, Yasumasa Ooya, Tsutomu Ishii, Yasuhiro Shirakawa, Yukihiro Takenami
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Publication number: 20090272985Abstract: This invention provides a white LED lamp using an ultraviolet light emitting LED, which can simultaneously realize a high level of color rendering and a high level of brightness by virtue of an improved combination of a blue light emitting phosphor, a green light emitting phosphor, and a red light emitting phosphor. A white LED lamp 1 according to the present invention comprises an LED chip 2 having a luminescence wavelength of not less than 360 nm and not more than 440 nm, and a light emitting part excitable upon exposure to light from the LED chip 2 to emit white light and comprising a phosphor, the phosphor comprising a blue light emitting phosphor, a green light emitting phosphor, and a red light emitting phosphor bonded to each other. At least one phosphor selected from europium-activated halophosphate phosphors and europium-activated aluminate phosphors is used as the blue light emitting phosphor. A gold- and aluminum-activated zinc sulfide phosphor is used as the green light emitting phosphor.Type: ApplicationFiled: September 12, 2006Publication date: November 5, 2009Inventors: Tsutomu Ishii, Yasuhiro Shirakawa, Hajime Takeuchi, Ryo Sakai, Yasumasa Ooya
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Publication number: 20090166652Abstract: Disclosed are a white LED, which has color reproducibility comparable with that of a cold-cathode tube and improved brightness, and a backlight and a liquid crystal display device comprising the white LED. The white LED comprises at least one light emitting element selected from ultraviolet light emitting diodes, purple light emitting diodes, ultraviolet light emitting lasers, and purple light emitting lasers, and a phosphor layer. The phosphor layer comprises a green phosphor satisfying formula 1, a blue phosphor satisfying formula 2 or 3, and a red phosphor satisfying formula 4 or 5: a trivalent cerium- and terbium-activated rare earth boride phosphor represented by formula 1: M1-x-yCexTbyBO3 wherein M represents at least one element selected from Sc (scandium), Y (yttrium), La (lanthanum), Gd (gadolinium), and Lu (lutetium); and x and y are respective numbers of 0.03<x<0.3 and 0.03<y<0.3; a divalent europium-activated halophosphate phosphor represented by formula 2: (M2, Eu)10(PO4)6.Type: ApplicationFiled: April 25, 2006Publication date: July 2, 2009Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Ryo Sakai, Yasuhiro Shirakawa, Hajime Takeuchi, Tsutomu Ishii, Yasumasa Ooya
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Publication number: 20090154195Abstract: A white light-emitting device 1 includes a semiconductor light-emitting element 2 emitting ultraviolet light or violet light, and a light-emitting unit 10 which includes three or more kinds of visible light-emitting phosphors 9 and emits white light when excited by the light from the semiconductor light-emitting element 2. The emission spectrum of the light-emitting unit 10 has peaks in a blue region of not less than 440 nm nor more than 460 nm, a green region of not less than 510 nm nor more than 530 nm, and a red region of not less than 620 nm nor more than 640 nm, and the three or more kinds of visible light-emitting phosphors 9 are bound together with a binder in advance.Type: ApplicationFiled: September 28, 2006Publication date: June 18, 2009Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA MATERIALS CO., LTD.Inventors: Tsutomu Ishii, Yasuhiro Shirakawa, Hajime Takeuchi, Yasumasa Ooya, Ryo Sakai
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Publication number: 20090115936Abstract: A backlight unit 1 includes a plurality of light emitting devices 2 constituted with, for example, LED lamps, and an optical sheet 4 disposed on light emission surface 2b sides of the light emitting devices 2. The light emission surface sides of the plural light emitting devices are joined to the optical sheet 4 via joining layers 5. The backlight unit 1 satisfies a condition of n1?n2?n3, where n1 is a refractive index of the optical sheet 4, n2 is a refractive index of the joining layer 5, and n3 is a refractive index of the light emitting device 2.Type: ApplicationFiled: July 4, 2006Publication date: May 7, 2009Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA MATERIALS CO., LTDInventors: Hajime Takeuchi, Ryo Sakai, Yasumasa Ooya, Tsutomu Ishii, Yasuhiro Shirakawa, Yukihiro Takenami
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Publication number: 20090097233Abstract: A light-emitting device includes a semiconductor light-emitting element arranged on a substrate having internal wiring, a reflector arranged around the semiconductor light-emitting element, and a light-emitting portion, filled in the reflector, having a phosphor which emits visible light when excited by light from the semiconductor light-emitting element. Electrical conduction to the light-emitting element is obtained via the internal wiring of the substrate and the reflector.Type: ApplicationFiled: August 22, 2006Publication date: April 16, 2009Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA MATERIALS CO., LTD.Inventors: Yasumasa Ooya, Ryo Sakai, Hajime Takeuchi, Tsutomu Ishii, Yasuhiro Shirakawa
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Publication number: 20090026916Abstract: A white light-emitting lamp (1) includes a semiconductor light-emitting device such as a LED chip (2) which has an emission wavelength of 360 nm or more and 440 nm or less, and a light-emitting part including a blue light-emitting phosphor, a green light-emitting phosphor and a red light-emitting phosphor, which emits white light when excited by light from the LED chip (2). At least one phosphor selected from Eu activated halophosphate phosphors and Eu activated aluminate phosphors is used as the blue light-emitting phosphor, Au and Al activated zinc sulfide phosphor is used as the green light-emitting phosphor, and at least one phosphor selected from Eu and Sm activated lanthanum sulfide phosphors and Cu and Mn activated zinc sulfide phosphors is used as the red light-emitting phosphor.Type: ApplicationFiled: February 24, 2006Publication date: January 29, 2009Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Tsutomu Ishii, Yasuhiro Shirakawa, Yasumasa Ooya
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Publication number: 20080106186Abstract: The present invention provides a white LED comprising: an ultraviolet emitting diode or a purple light emitting diode; and phosphors for emitting at least three visible lights including blue light, green light and red light; wherein an emission spectrum of the white LED has; a first luminescence peak in a blue light region having a wavelength of 440-460 nm; a second luminescence peak in a green light region having a wavelength of 510-530 nm; and a third luminescence peak in a red light region having a wavelength of 620-640 nm. Further, it is preferable that a half bandwidth of each of the luminescence peaks is 50 nm or less.Type: ApplicationFiled: December 20, 2005Publication date: May 8, 2008Applicants: Kabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.Inventors: Tsutomu Ishii, Hajime Takeuchi, Yasuhiro Shirakawa, Yasumasa Ooya, Ryo Sakai, Masahiko Yamakawa