Patents by Inventor Ryoji Tsuda
Ryoji Tsuda 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: 20240044459Abstract: Provided are a method for using a white light source, and a white light source, wherein precise control of daily rhythm and pleasant lighting can be safely and easily realized in a place of living such as a general home. An embodiment provides a method for using a white light source.Type: ApplicationFiled: September 4, 2023Publication date: February 8, 2024Inventors: Masahiko YAMAKAWA, Kumpei KOBAYASHI, Ryoji TSUDA, Noriaki YAGI, Kiyoshi INOUE, Kyung Hee YE
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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: 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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Patent number: 10473274Abstract: According to one embodiment, there is provided a white light source system including white light sources. An absolute value of a difference between (P(?)×V(?))/(P(?max1)×V(?max1)) and (B(?)×V(?))/(B(?max2)×V(?max2)) for each of the white light sources satisfies a relational expression represented by |((P(?)×V(?))/(P(?max1)×V(?max1))?(B(?)×V(?))/(B(?max2)×V(?max2))|?0.15 The white light source system has a light emission characteristic of white light emitted by the system is continuously changed along with an elapse of time by changing a mixing ratio of light beams from the white light sources.Type: GrantFiled: December 20, 2017Date of Patent: November 12, 2019Assignees: Kabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.Inventors: Masahiko Yamakawa, Ryoji Tsuda, Yasumasa Ooya, Tatsunori Itoga, Yasuhiro Shirakawa, Junji Taniguchi
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Patent number: 10368408Abstract: A light emitting device includes: a first white light source which includes N pieces of first white light emitting diodes and emits a first white light; and a second white light source which includes M pieces of second white light emitting diodes and a first resistance element electrically connected in series to the second white light emitting diodes and having a first resistance value, is electrically connected in parallel to the first white light source, and emits a second white light, the light emitting device emitting a mixed white light of the first white light and the second white light. The drive voltage of the first white light source is higher than a drive voltage of the second white light source, and a color temperature of the mixed white light is higher as a total luminous flux of the mixed white light is higher.Type: GrantFiled: September 8, 2016Date of Patent: July 30, 2019Assignee: Toshiba Materials Co., Ltd.Inventors: Hiroyasu Kondo, Masahiko Yamakawa, Yasuhiro Shirakawa, Ryoji Tsuda, Atsuji Nakagawa, Toshitaka Fujii, Tomohiko Inoue
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Patent number: 10368409Abstract: A light emitting device includes: a first white light source which includes N pieces of first white light emitting diodes and emits a first white light; and a second white light source which includes M pieces of second white light emitting diodes and a first resistance element electrically connected in series to the second white light emitting diodes and having a first resistance value, is electrically connected in parallel to the first white light source, and emits a second white light, the light emitting device emitting a mixed white light of the first white light and the second white light. The drive voltage of the first white light source is higher than a drive voltage of the second white light source, and a color temperature of the mixed white light is higher as a total luminous flux of the mixed white light is higher.Type: GrantFiled: October 24, 2017Date of Patent: July 30, 2019Assignee: Toshiba Materials Co., Ltd.Inventors: Hiroyasu Kondo, Masahiko Yamakawa, Yasuhiro Shirakawa, Ryoji Tsuda, Atsuji Nakagawa, Toshitaka Fujii, Tomohiko Inoue
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Patent number: 10274185Abstract: According to one embodiment, a lighting device includes a hollow globe having an opening at an end thereof, a light source housed in the globe and including at least an LED, a pillar portion housed in the globe and supporting the light source, a cap connector directly connected to the pillar portion, or indirectly connected to the pillar portion via another member, and a cap attached to the cap connector and electrically connected to the light source. A thermally conductive layer is provided between the inner surface of the globe and the lateral surface of the pillar portion.Type: GrantFiled: September 12, 2016Date of Patent: April 30, 2019Assignees: Kabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.Inventors: Mitsuaki Kato, Hiroshi Ohno, Katsumi Hisano, Hiroyasu Kondo, Ryoji Tsuda
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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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Patent number: 10107457Abstract: A lighting apparatus according to an embodiment includes a globe, an optical element including a scattering portion inside and transparent to visible light, and a light source disposed to be opposed to a light incident surface of the optical element. The scattering portion is disposed inside the globe.Type: GrantFiled: April 7, 2017Date of Patent: October 23, 2018Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA MATERIALS CO., LTD.Inventors: Hiroshi Ohno, Mitsuaki Kato, Hiromichi Hayashihara, Hiroyasu Kondo, Ryoji Tsuda, Yasumasa Ooya
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Publication number: 20180135813Abstract: According to one embodiment, there is provided a white light source system including white light sources. An absolute value of a difference between (P(?)×V(?))/(P(?max1)×V(?max1)) and (B(?)×V(?))/(B(?max2)×V(?max2)) for each of the white light sources satisfies a relational expression represented by |((P(?)×V(?))/(P(?max1)×V(?max1))?(B(?)×V(?))/(B(?max2)×V(?max2))|?0.15 The white light source system has a light emission characteristic of white light emitted by the system is continuously changed along with an elapse of time by changing a mixing ratio of light beams from the white light sources.Type: ApplicationFiled: December 20, 2017Publication date: May 17, 2018Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA MATERIALS CO., LTD.Inventors: Masahiko YAMAKAWA, Ryoji TSUDA, Yasumasa OOYA, Tatsunori ITOGA, Yasuhiro SHIRAKAWA, Junji TANIGUCHI
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Publication number: 20180049285Abstract: A light emitting device includes: a first white light source which includes N pieces of first white light emitting diodes and emits a first white light; and a second white light source which includes M pieces of second white light emitting diodes and a first resistance element electrically connected in series to the second white light emitting diodes and having a first resistance value, is electrically connected in parallel to the first white light source, and emits a second white light, the light emitting device emitting a mixed white light of the first white light and the second white light. The drive voltage of the first white light source is higher than a drive voltage of the second white light source, and a color temperature of the mixed white light is higher as a total luminous flux of the mixed white light is higher.Type: ApplicationFiled: October 24, 2017Publication date: February 15, 2018Applicants: Toshiba Materials Co., Ltd., Phoenix Electric Co., Ltd.Inventors: Hiroyasu Kondo, Masahiko Yamakawa, Yasuhiro Shirakawa, Ryoji Tsuda, Atsuji Nakagawa, Toshitaka Fujii, Tomohiko Inoue
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Publication number: 20170211749Abstract: A lighting apparatus according to an embodiment includes a globe, an optical element including a scattering portion inside and transparent to visible light, and a light source disposed to be opposed to a light incident surface of the optical element. The scattering portion is disposed inside the globe.Type: ApplicationFiled: April 7, 2017Publication date: July 27, 2017Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA MATERIALS CO., LTD.Inventors: Hiroshi OHNO, Mitsuaki KATO, Hiromichi HAYASHIHARA, Hiroyasu KONDO, Ryoji TSUDA, Yasumasa OOYA
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Publication number: 20170167666Abstract: An optical element according to an embodiment is formed from a material transparent to visible light and has a rotationally symmetrical shape with respect to the central axis. A cavity containing no transparent material is provided inside the optical element. The inner surface of the cavity has a shape in which a boundary line of the cavity along which a plane including the central axis intersects the inner surface includes a curve portion expanding toward the outside of the optical element. The inner surface of the cavity does not include any surface recessed inwardly.Type: ApplicationFiled: February 28, 2017Publication date: June 15, 2017Applicants: Kabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.Inventors: Hiroshi OHNO, Mitsuaki KATO, Hiromichi HAYASHIHARA, Hiroyasu KONDO, Ryoji TSUDA, Yasumasa OOYA
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Publication number: 20170048941Abstract: A light emitting device includes: a first white light source which includes N pieces of first white light emitting diodes and emits a first white light; and a second white light source which includes M pieces of second white light emitting diodes and a first resistance element electrically connected in series to the second white light emitting diodes and having a first resistance value, is electrically connected in parallel to the first white light source, and emits a second white light, the light emitting device emitting a mixed white light of the first white light and the second white light. The drive voltage of the first white light source is higher than a drive voltage of the second white light source, and a color temperature of the mixed white light is higher as a total luminous flux of the mixed white light is higher.Type: ApplicationFiled: September 8, 2016Publication date: February 16, 2017Applicants: Toshiba Materials Co., Ltd., Phoenix Electric Co., Ltd.Inventors: Hiroyasu KONDO, Masahiko YAMAKAWA, Yasuhiro SHIRAKAWA, Ryoji TSUDA, Atsuji NAKAGAWA, Toshitaka FUJII, Tomohiko INOUE
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Publication number: 20160377278Abstract: According to one embodiment, a lighting device includes a hollow globe having an opening at an end thereof, a light source housed in the globe and including at least an LED, a pillar portion housed in the globe and supporting the light source, a cap connector directly connected to the pillar portion, or indirectly connected to the pillar portion via another member, and a cap attached to the cap connector and electrically connected to the light source. A thermally conductive layer is provided between the inner surface of the globe and the lateral surface of the pillar portion.Type: ApplicationFiled: September 12, 2016Publication date: December 29, 2016Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA MATERIALS CO., LTD.Inventors: Mitsuaki KATO, Hiroshi OHNO, Katsumi HISANO, Hiroyasu KONDO, Ryoji TSUDA
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Patent number: 6593985Abstract: A color shutter, comprising first, second and third polarizers, first and second retarders, first and second polarizing rotators, and at least one absorption type partial polarizer.Type: GrantFiled: August 30, 2000Date of Patent: July 15, 2003Assignee: Kabushiki Kaisha ToshibaInventors: Kazuki Taira, Shigeki Uno, Tatsuo Saishu, Kohei Suzuki, Ryoji Tsuda
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Patent number: D765275Type: GrantFiled: March 25, 2015Date of Patent: August 30, 2016Assignees: Kabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.Inventors: Hiroshi Ohno, Mitsuaki Kato, Katsumi Hisano, Yasuhiro Shirakawa, Hiroyasu Kondo, Ryoji Tsuda