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).
-
Patent number: 8598618Abstract: 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: GrantFiled: April 15, 2009Date of Patent: December 3, 2013Assignees: Kabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.Inventors: Tsutomu Ishii, Hajime Takeuchi, Ryo Sakai, Yasumasa Ooya, Yasuhiro Shirakawa
-
Patent number: 8541798Abstract: 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: GrantFiled: September 27, 2007Date of Patent: September 24, 2013Assignees: Kabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.Inventors: Yasumasa Ooya, Ryo Sakai, Hajime Takeuchi, Tsutomu Ishii, Yasuhiro Shirakawa
-
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
-
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
-
Patent number: 8471283Abstract: 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: GrantFiled: February 19, 2009Date of Patent: June 25, 2013Assignees: Kabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.Inventors: Tsutomu Ishii, Hajime Takeuchi, Yasumasa Ooya, Katsutoshi Nakagawa, Yumi Ito, Masaki Toyoshima, Yasuhiro Shirakawa, Ryo Sakai
-
Patent number: 8461756Abstract: A linear white light source 1 includes a base, a plurality of light emitting diode chips linearly disposed on the base and each generating ultraviolet light having a wavelength of not less than 330 nm nor more than 410 nm, and a phosphor layer continuously formed on the base to cover the plurality of light emitting diode chips and containing a red light emitting phosphor, a green light emitting phosphor, and a blue light emitting phosphor.Type: GrantFiled: November 19, 2010Date of Patent: June 11, 2013Assignees: Kabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.Inventors: Ryo Sakai, Yasuhiro Shirakawa, Hajime Takeuchi, Tsutomu Ishii, Yasumasa Ooya
-
Publication number: 20130100645Abstract: In one embodiment, an LED light bulb includes an LED module, a base portion on which the LED module is disposed, and a glove attached to the base portion. The LED module includes an ultraviolet to violet light-emitting LED chip mounted on a substrate. A lighting circuit and a bayonet cap are provided in and on the base portion. A fluorescent film is provided on an inner surface of the glove, and emits white light by absorbing ultraviolet to violet light emitted from the LED chip. The fluorescent film has a film thickness in a range of 80 to 800 ?m. In the LED light bulb, an amount of ultraviolet light which leaks from the glove is 0.1 mW/nm/lm or less.Type: ApplicationFiled: December 11, 2012Publication date: April 25, 2013Inventors: Yasumasa OOYA, Masahiko Yamakawa, Yasuhiro Shirakawa, Katsutoshi Nakagawa
-
Patent number: 8409754Abstract: A positive electrode active material for use in a non-aqueous electrolyte secondary cell comprises a powdery metal oxide (LiCoO2, LiNiO2, LiMn2O4 or the like). When the positive electrode active material is classified with a classification precision index ? of 0.7 or greater so as to obtain a coarse powder having a classification ratio in a range of 0.1% to 5%, a ratio (B/A) of the content (B) of an impurity metal element in the coarse powder obtained by the classification to the content (A) of the impurity metal element in the powder before the classification is 1.5 or less. The contents of the impurity metal elements are compared with respect to Ca, Mn, Fe, Cr, Cu, Zn and the like (exclusive of the metal element constituting the powdery metal oxide). The positive electrode active material for a secondary cell serves to improve cell performance capabilities and production yields.Type: GrantFiled: June 20, 2007Date of Patent: April 2, 2013Assignee: Kabushiki Kaisha ToshibaInventors: Ryo Sakai, Yasuhiro Shirakawa, Hajime Takeuchi, Yasumasa Ooya, Koshin Tanaka, Kazuki Amemiya, Shouta Endou
-
Patent number: 8395725Abstract: 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: GrantFiled: January 17, 2007Date of Patent: March 12, 2013Assignees: Kabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.Inventors: Hajime Takeuchi, Ryo Sakai, Yasumasa Ooya, Tsutomu Ishii, Yasuhiro Shirakawa
-
Publication number: 20130010456Abstract: 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/Im or less.Type: ApplicationFiled: September 14, 2012Publication date: January 10, 2013Applicants: TOSHIBA MATERIALS CO., LTD., KABUSHIKI KAISHA TOSHIBAInventors: Tsutomu ISHII, Hajime TAKEUCHI, Yasumasa OOYA, Katsutoshi NAKAGAWA, Yumi ITO, Masaki TOYOSHIMA, Yasuhiro SHIRAKAWA, Ryo SAKAI
-
Patent number: 8344407Abstract: 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: GrantFiled: May 28, 2009Date of Patent: January 1, 2013Assignees: Kabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.Inventors: Tetsuo Inoue, Hajime Takeuchi, Yasumasa Ooya, Toshio Shimaoogi, Yasuhiro Shirakawa
-
Patent number: 8288937Abstract: A white LED includes a light emitting element with a light emission peak wavelength equal to or longer than 380 nm and equal to or shorter than 420 nm, and a phosphor layer containing three or more types of phosphors including at least a blue phosphor, a green phosphor, and a red phosphor and disposed in a manner to cover at least part of the light emitting element. The phosphor layer has a first phosphor layer and a second phosphor layer disposed in an opposite side of a side of the light emitting element of the first phosphor layer. In the first phosphor layer, a content of the blue phosphor in an entire phosphor contained in the first phosphor layer is equal to or less than 5 mass %, or the blue phosphor is not contained. In the second phosphor layer, a content of phosphor other than the blue phosphor in an entire phosphor contained in the second phosphor layer is equal to or less than 5 mass %, or no phosphor other than the blue phosphor is contained.Type: GrantFiled: November 30, 2010Date of Patent: October 16, 2012Assignees: Kabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.Inventors: Tsutomu Ishii, Yasumasa Ooya, Ryo Sakai, Katsutoshi Nakagawa, Hajime Takeuchi, Yumi Ito, Yasuhiro Shirakawa
-
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
-
Publication number: 20120206671Abstract: Certain embodiments provide a white LED for a backlight of a liquid crystal display device, which comprises an ultraviolet (or violet) light emitting element and a phosphor layer that contains a green phosphor selected from trivalent cerium- and terbium-activated rare earth borate phosphors, a blue phosphor selected from divalent europium-activated halophosphate phosphors and divalent europium-activated aluminate phosphors, and a red phosphor selected from europium-activated lanthanum oxysulfide phosphors and europium-activated yttrium oxysulfide phosphors as the contained amounts of the respective phosphors relative to the total amount of the phosphors as follows: 35-50% by weight of the green phosphor content; 50-70% by weight of the blue phosphor content; and 1-10% by weight of the red phosphor content.Type: ApplicationFiled: February 29, 2012Publication date: August 16, 2012Applicants: Toshiba Materials Co., Ltd., Kabushiki Kaisha ToshibaInventors: Hajime TAKEUCHI, Ryo Sakai, Tsutomu Ishii, Yasumasa Ooya, Yasuhiro Shirakawa
-
Patent number: 8174180Abstract: A light emitting device 1 includes a light emitting diode, a phosphor layer containing phosphors that emit a visible light by being excited by a light emitted from the light emitting diode, and a reflector disposed to surround the light emitting diode. A portion of 50% or more in an area ratio of a reflecting surface of the reflector is formed as a scattering surface with a mean square inclination (?q) (0.1 mm) in a range of not less than 0.003 nor more than 0.03.Type: GrantFiled: January 14, 2011Date of Patent: May 8, 2012Assignees: Kabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.Inventors: Tetsuo Inoue, Hajime Takeuchi, Yasumasa Ooya, Toshio Shimaoogi, Yasuhiro Shirakawa
-
Publication number: 20120062821Abstract: In a embodiment, a white LED for a backlight of a liquid crystal display device conforming to the EBU standard includes an ultraviolet (purple) light-emitting element, and a phosphor layer which contains 1 to 10 wt % of a green phosphor including a divalent europium-activated silicate phosphor, 40 to 80 wt % of a blue phosphor including at least one selected from a divalent europium-activated halo-phosphate phosphor and a divalent europium-activated aluminate phosphor, and 10 to 50 wt % of a red phosphor including at least one selected from a europium-activated lanthanum oxysulfide phosphor and a europium-activated yttrium oxysulfide phosphor.Type: ApplicationFiled: September 9, 2011Publication date: March 15, 2012Applicants: TOSHIBA MATERIALS CO., LTD., Kabushiki Kaisha ToshibaInventors: Hajime TAKEUCHI, Ryo Sakai, Tsutomu Ishii, Yasumasa Ooya, Yasuhiro Shirakawa
-
Patent number: 7961762Abstract: 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: GrantFiled: February 7, 2008Date of Patent: June 14, 2011Assignees: Kabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.Inventors: Tsutomu Ishii, Yasuhiro Shirakawa, Ryo Sakai, Yasumasa Ooya, Hajime Takeuchi
-
Publication number: 20110128466Abstract: A white LED includes a light emitting element with a light emission peak wavelength equal to or longer than 380 nm and equal to or shorter than 420 nm, and a phosphor layer containing three or more types of phosphors including at least a blue phosphor, a green phosphor, and a red phosphor and disposed in a manner to cover at least part of the light emitting element. The phosphor layer has a first phosphor layer and a second phosphor layer disposed in an opposite side of a side of the light emitting element of the first phosphor layer. In the first phosphor layer, a content of the blue phosphor in an entire phosphor contained in the first phosphor layer is equal to or less than 5 mass %, or the blue phosphor is not contained. In the second phosphor layer, a content of phosphor other than the blue phosphor in an entire phosphor contained in the second phosphor layer is equal to or less than 5 mass %, or no phosphor other than the blue phosphor is contained.Type: ApplicationFiled: November 30, 2010Publication date: June 2, 2011Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA MATERIALS CO., LTD.Inventors: Tsutomu ISHII, Yasumasa Ooya, Ryo Sakai, Katsutoshi Nakagawa, Hajime Takeuchi, Yumi Ito, Yasuhiro Shirakawa
-
Publication number: 20110116005Abstract: A linear white light source 1 includes a base, a plurality of light emitting diode chips linearly disposed on the base and each generating ultraviolet light having a wavelength of not less than 330 nm nor more than 410 nm, and a phosphor layer continuously formed on the base to cover the plurality of light emitting diode chips and containing a red light emitting phosphor, a green light emitting phosphor, and a blue light emitting phosphor.Type: ApplicationFiled: November 19, 2010Publication date: May 19, 2011Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA MATERIALS CO., LTD.Inventors: Ryo SAKAI, Yasuhiro SHIRAKAWA, Hajime TAKEUCHI, Tsutomu ISHII, Yasumasa OOYA
-
Publication number: 20110109222Abstract: A light emitting device 1 includes a light emitting diode, a phosphor layer containing phosphors that emit a visible light by being excited by a light emitted from the light emitting diode, and a reflector disposed to surround the light emitting diode. A portion of 50% or more in an area ratio of a reflecting surface of the reflector is formed as a scattering surface with a mean square inclination (?q) (0.1 mm) in a range of not less than 0.003 nor more than 0.03.Type: ApplicationFiled: January 14, 2011Publication date: May 12, 2011Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA MATERIALS CO., LTD.Inventors: Tetsuo INOUE, Hajime TAKEUCHI, Yasumasa OOYA, Toshio SHIMAOOGI, Yasuhiro SHIRAKAWA