Patents by Inventor Seitaro Akagawa
Seitaro Akagawa 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: 10274667Abstract: A light-emitting device includes: one or more first light-emitting elements each having a peak wavelength in a range from 430 nm to less than 490 nm; a second light-emitting element having a peak wavelength Y in a range from 490 nm to less than a wavelength X; a third light-emitting element having a peak wavelength Z in a range from more than the wavelength X to 570 nm; and a phosphor or a fourth light-emitting element having a peak wavelength in a range from 580 nm to 680 nm. At least one of the second and third light-emitting elements is connected to at least one of the first light-emitting elements in series. The wavelength X is in a range from more than 490 nm to less than 570 nm with an absolute value of difference between |X?Y| and |X?Z| being 10 nm or less.Type: GrantFiled: January 17, 2017Date of Patent: April 30, 2019Assignee: NICHIA CORPORATIONInventors: Seitaro Akagawa, Takeshi Morikawa, Yusaku Achi, Kentaro Nishigaki
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Publication number: 20180375004Abstract: A light emitting device includes a resin package having a rectangular shape in a top view and two short-side lateral surfaces and two long-side lateral surfaces. The two short-side lateral surfaces include a first external surface and a second external surface located on an opposite side from the first external surface. The two long-side lateral surfaces include a third external surface and a fourth external lateral surface located on an opposite side from the third external lateral surface. The lead is not exposed on the third external lateral surface nor the fourth external lateral surface. The first lead is exposed at the first external lateral surface and the second external lateral surface, respectively flush with the resin member at the first external lateral surface and the second external lateral surface. The second lead is exposed at the second external lateral surface, flush with the resin part at the second external lateral surface.Type: ApplicationFiled: June 26, 2018Publication date: December 27, 2018Applicant: NICHIA CORPORATIONInventors: Ryohei YAMASHITA, Seitaro AKAGAWA, Toshiyuki HASHIMOTO, Kazuki KODA, Kiyoshi KAYAMA, Yuta HORIKAWA, Ryosuke WAKAKI
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Publication number: 20180097152Abstract: A method for manufacturing a light emitting device includes: mounting a first light emitting element whose emission peak wavelength is in a range of 430 nm to 490 nm and a second light emitting element whose emission peak wavelength is in a range of 490 nm to 570 nm; and providing a light transmitting member including a red phosphor and at least one of a green phosphor of which a half width of an emission spectrum is not more than 45 nm and a blue phosphor of which a half width of an emission spectrum is not more than 60 nm. The step of providing the light transmitting member includes adding at least one of a predetermined amount of the green phosphor and a predetermined amount of the blue phosphor based on the emission peak wavelength of the second light emitting element.Type: ApplicationFiled: September 29, 2017Publication date: April 5, 2018Applicant: NICHIA CORPORATIONInventors: Seitaro AKAGAWA, Kazuki KODA
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Publication number: 20180024006Abstract: A method of determining a chromaticity rank of a light emitting device includes selecting the light emitting device having a chromaticity rank in a region surrounded by four defining points on a 1931 CIE Chromaticity Diagram. A ratio of a distance in a y-direction between, of the four defining points, two defining points furthest from each other in the y-direction to a distance in an x-direction between, of the four defining points, two defining points furthest from each other in the x-direction is 0.5 or less A peak light emission wavelength of the blue light emitting element is in a range of 447 to 452 nm, a peak light emission wavelength of the green light emitting element is in a range of 520 to 541 nm, and a peak light emission wavelength of the red light emitting element is in a range of 630 to 632 nm.Type: ApplicationFiled: July 21, 2017Publication date: January 25, 2018Applicant: NICHIA CORPORATIONInventors: Seitaro AKAGAWA, Toshiyuki HASHIMOTO, Kentaro NISHIGAKI
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Patent number: 9755116Abstract: A method of manufacturing a light emitting device includes providing a package; disposing a light emitting element in a recess of the package; injecting a sealing material in the recess, the sealing material including fluorescent material particles and a binder, the fluorescent material particles including particles of fluoride fluorescent material that include a surface region and an inner region, both the surface region and the inner region having a composition including: tetravalent manganese ions, at least one element or compound selected from the group consisting of alkali metal elements and NH4+, and at least one element selected from the group consisting of Group 4 and Group 14 elements; sedimenting centrifugally the fluorescent material particles toward a bottom surface in the recess to form a sealing member that comprises a first sealing member portion and a second sealing member portion; and curing the binder to form a cured sealing member.Type: GrantFiled: July 11, 2016Date of Patent: September 5, 2017Assignee: NICHIA CORPORATIONInventors: Seitaro Akagawa, Tomokazu Yoshida
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Publication number: 20170229512Abstract: A light emitting device includes at least three light emitting elements arranged side by side, and one or more light transmissive members each containing a phosphor and covering the light emitting elements. The at least three light emitting elements include two outer light emitting elements arranged on outer sides, and an inner light emitting element arranged between the two outer light emitting elements and having a different peak emission wavelength than a peak emission wavelength of the two outer light emitting elements. The phosphor has a longer peak emission wavelength than the peak emission wavelengths of the outer light emitting elements and the peak emission wavelength of the inner light emitting element. The two outer light emitting elements and the inner light emitting element are connected in series.Type: ApplicationFiled: February 7, 2017Publication date: August 10, 2017Applicant: NICHIA CORPORATIONInventors: Seitaro AKAGAWA, Takeshi MORIKAWA, Kentaro NISHIGAKI
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Publication number: 20170205565Abstract: A light-emitting device includes: one or more first light-emitting elements each having a peak wavelength in a range from 430 nm to less than 490 nm; a second light-emitting element having a peak wavelength Y in a range from 490 nm to less than a wavelength X; a third light-emitting element having a peak wavelength Z in a range from more than the wavelength X to 570 nm; and a phosphor or a fourth light-emitting element having a peak wavelength in a range from 580 nm to 680 nm. At least one of the second and third light-emitting elements is connected to at least one of the first light-emitting elements in series. The wavelength X is in a range from more than 490 nm to less than 570 nm with an absolute value of difference between |X?Y| and |X?Z| being 10 nm or less.Type: ApplicationFiled: January 17, 2017Publication date: July 20, 2017Inventors: Seitaro AKAGAWA, Takeshi MORIKAWA, Yusaku ACHI, Kentaro NISHIGAKI
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Publication number: 20170040301Abstract: The light-emitting device includes a first light-emitting element having an emission peak wavelength of 430 nm or more and less than 490 nm, a second light-emitting element having an emission peak wavelength of 490 nm or more and 570 nm or less, a support body at which the first light-emitting element and the second light-emitting element are disposed, and a light-transmissive member containing a red phosphor and covering the first light-emitting element and the second light-emitting element. A content density of the red phosphor in the light-transmissive member in a space between the first and second light-emitting elements is higher in a part below an upper surface of the second light-emitting element than in a part above the upper surface thereof.Type: ApplicationFiled: August 1, 2016Publication date: February 9, 2017Applicant: NICHIA CORPORATIONInventors: Atsushi YAMAMOTO, Keiko ONO, Saiki YAMAMOTO, Tomokazu MARUYAMA, Takeshi MORIKAWA, Seitaro AKAGAWA
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Patent number: 9559274Abstract: Provided a light emitting device comprising: a package; a light emitting element disposed in the package; an encapsulation member that covers the light emitting element, the encapsulation member being formed from a resin composition that contains a fluorescent material, a resin, and nanoparticles selected from at least one of the group consisting of aluminum oxide nanoparticles, titanium oxide nanoparticles, zinc oxide nanoparticles, zirconium oxide nanoparticles, and silicon oxide nanoparticles, wherein when the resin composition includes silicon oxide nanoparticles, the content of the silicon oxide nanoparticles is 0.Type: GrantFiled: April 19, 2016Date of Patent: January 31, 2017Assignee: NICHIA CORPORATIONInventors: Akihiro Ota, Seitaro Akagawa, Hirofumi Ichikawa, Yasunori Shimizu
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Publication number: 20160322542Abstract: A method of manufacturing a light emitting device can be provided. The method includes: providing a package having side walls which define a recess; disposing a light emitting element in the recess; injecting a sealing material in the recess of the package, sedimenting centrifugally the fluorescent material particles toward a bottom surface in the recess to form a sealing member that comprises a first sealing member portion and a second sealing member portion; and curing the binder to form a cured sealing member. The sealing material includes a binder and fluorescent material particles that includes particles of fluoride fluorescent material that have a composition including tetravalent manganese ions, at least one selecting from the group consisting of alkali metal elements and NH4+ and at least one selecting from the group consisting of Group 4 elements and Group 14 elements.Type: ApplicationFiled: July 11, 2016Publication date: November 3, 2016Applicant: Nichia CorporationInventors: Seitaro AKAGAWA, Tomokazu YOSHIDA
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Patent number: 9419187Abstract: A light emitting device includes a package having side walls which define a recess, a light emitting element arranged in the recess, and a sealing member which seals the light emitting element. The sealing member includes a first portion which contains a fluorescent material and covers the light emitting element, and a second portion which does not contain a fluorescent material and is arranged over the first portion. The fluorescent material is a fluoride fluorescent material activated with tetravalent manganese represented by the following formula (I). The particles of the fluorescent material has a surface region with a tetravalent manganese ion concentration is lower than inner side. A2[M1-bMn4+bF6]??(I) In the formula (I), A is a cation which contains K+ and may contain at least one selected from the group consisting of Li+, Na+, Rb+, Cs+, and NH4+, M is at least one of 15 Group 4 and Group 14 elements, and 0<b<0.2.Type: GrantFiled: March 13, 2015Date of Patent: August 16, 2016Assignee: NICHIA CORPORATIONInventors: Seitaro Akagawa, Tomokazu Yoshida
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Publication number: 20160233396Abstract: Provided a light emitting device comprising: a package; a light emitting element disposed in the package; an encapsulation member that covers the light emitting element, the encapsulation member being formed from a resin composition that contains a fluorescent material, a resin, and nanoparticles selected from at least one of the group consisting of aluminum oxide nanoparticles, titanium oxide nanoparticles, zinc oxide nanoparticles, zirconium oxide nanoparticles, and silicon oxide nanoparticles, wherein when the resin composition includes silicon oxide nanoparticles, the content of the silicon oxide nanoparticles is 0.Type: ApplicationFiled: April 19, 2016Publication date: August 11, 2016Applicant: NICHIA CORPORATIONInventors: Akihiro OTA, Seitaro AKAGAWA, Hirofumi ICHIKAWA, Yasunori SHIMIZU
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Patent number: 9397276Abstract: Provided a light emitting device comprising: a package; a light emitting element disposed in the package; an encapsulation member that covers the light emitting element, the encapsulation member being formed from a resin composition that contains a fluorescent material, a resin, and nanoparticles selected from at least one of the group consisting of aluminum oxide nanoparticles, titanium oxide nanoparticles, zinc oxide nanoparticles, zirconium oxide nanoparticles, and silicon oxide nanoparticles, wherein when the resin composition includes silicon oxide nanoparticles, the content of the silicon oxide nanoparticles is 0.Type: GrantFiled: January 20, 2015Date of Patent: July 19, 2016Assignee: NICHIA CORPORATIONInventors: Akihiro Ota, Seitaro Akagawa, Hirofumi Ichikawa, Yasunori Shimizu
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Publication number: 20160111610Abstract: Provided a light emitting device comprising: a package; a light emitting element disposed in the package; an encapsulation member that covers the light emitting element, the encapsulation member being formed from a resin composition that contains a fluorescent material, a resin, and nanoparticles selected from at least one of the group consisting of aluminum oxide nanoparticles, titanium oxide nanoparticles, zinc oxide nanoparticles, zirconium oxide nanoparticles, and silicon oxide nanoparticles, wherein when the resin composition includes silicon oxide nanoparticles, the content of the silicon oxide nanoparticles is 0.Type: ApplicationFiled: January 20, 2015Publication date: April 21, 2016Inventors: Akihiro OTA, Seitaro AKAGAWA, Hirofumi ICHIKAWA, Yasunori SHIMIZU
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Publication number: 20150263245Abstract: A light emitting device includes a package having side walls which define a recess, a light emitting element arranged in the recess, and a sealing member which seals the light emitting element. The sealing member includes a first portion which contains a fluorescent material and covers the light emitting element, and a second portion which does not contain a fluorescent material and is arranged over the first portion. The fluorescent material is a fluoride fluorescent material activated with tetravalent manganese represented by the following formula (I). The particles of the fluorescent material has a surface region with a tetravalent manganese ion concentration is lower than inner side. A2[M1-bMn4+bF6]??(I) In the formula (I), A is a cation which contains K+ and may contain at least one selected from the group consisting of Li+, Na+, Rb+, Cs+, and NH4+, M is at least one of Group 4 and Group 14 elements, and 0<b<0.2.Type: ApplicationFiled: March 13, 2015Publication date: September 17, 2015Inventors: Seitaro AKAGAWA, Tomokazu Yoshida
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Patent number: D668622Type: GrantFiled: August 10, 2010Date of Patent: October 9, 2012Assignee: Nichia CorporationInventor: Seitaro Akagawa
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Patent number: D696637Type: GrantFiled: August 27, 2012Date of Patent: December 31, 2013Assignee: Nichia CorporationInventor: Seitaro Akagawa