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公开(公告)号：US20210180769A1
公开(公告)日：2021-06-17
申请号：US16954107
申请日：2018-12-04
Inventor： Shozo OSHIO , Takeshi ABE
Abstract: A light-emitting apparatus includes: a first phosphor layer including a first phosphor composed of an inorganic phosphor activated by Ce3+; and a second phosphor layer including a second phosphor composed of an inorganic phosphor activated by Ce3+ and different from the first phosphor. The second phosphor layer is provided so as to be spaced apart from the first phosphor layer. The light-emitting apparatus further includes: an optical filter provided between the first phosphor layer and the second phosphor layer; and an excitation source that emits light that excites at least one of the first phosphor and the second phosphor. The second phosphor has light absorption characteristics of absorbing at least a part of first fluorescence emitted by the first phosphor. The optical filter reflects at least a part of the first fluorescence emitted by the first phosphor, and allows passage of second fluorescence emitted by the second phosphor.
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公开(公告)号：US20190323664A1
公开(公告)日：2019-10-24
申请号：US16457956
申请日：2019-06-29
Inventor： Takeshi ABE , Shozo OSHIO , Hiroshi ASANO , Yosuke HONDA
Abstract: A light emitting device includes a first wavelength converter that contains a first phosphor that absorbs at least part of primary light radiated by a radiation source and converts the primary light absorbed into secondary light, and a second wavelength converter that contains a second phosphor that absorbs at least part of the secondary light and converts the secondary light absorbed into tertiary light. The lifetime of fluorescence emitted from the second phosphor is longer than the lifetime of fluorescence emitted from the first phosphor, and the light density of the secondary light, with which the second wavelength converter is irradiated, is lower than the light density of the primary light, with which the first wavelength converter is irradiated.
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公开(公告)号：US20250113692A1
公开(公告)日：2025-04-03
申请号：US18730235
申请日：2023-01-23
Inventor： Takeshi ABE , Shogo MOTEGI , Mitsuru NITTA , Ryosuke SHIGITANI
IPC: H10H29/851 , H10F55/25 , H10H29/14 , H10H29/85
Abstract: A light-emitting device that emits output light, is a light-emitting device that includes: a light-emitting element that emits a primary light; and a wavelength converter that converts at least a portion of the primary light into a secondary light. The output light includes at least a portion of the secondary light. The output light has a light intensity greater than or equal to a predetermined value throughout an entire wavelength range of from 750 nm to 900 nm, inclusive. A ratio of a light intensity of the output light at 900 nm to a light intensity of the output light at 750 nm is greater than or equal to 0.2 and less than 3.0. The output light has a spectral luminosity of at least 0.1 lm/W and at most 10 lm/W.
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公开(公告)号：US20240036450A1
公开(公告)日：2024-02-01
申请号：US18287010
申请日：2022-03-09
Inventor： Hiroshi KITANO , Mitsuru NITTA , Takeshi ABE
IPC: G03B21/20
CPC classification number: G03B21/2006 , G03B21/2066
Abstract: In a projection system, a light source unit emits a first visible light beam, a second visible light beam having a longer wavelength than the first visible light beam, and a near infrared light beam. A spatial light modulation unit subjects the first visible light beam, the second visible light beam, and the near infrared light beam, all emitted from the light source unit, to spatial light modulation to produce a first image light beam, a second image light beam, and a third image light beam, respectively. A controller makes a projection optical system not only selectively project any one of a plurality of image light beams, including the first image light beam, the second image light beam, and the third image light beam, but also selectively project any two or more of the plurality of image light beams, by controlling the spatial light modulation unit in two different manners.
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Patent Agency Ranking
公开(公告)号：US20210167255A1
公开(公告)日：2021-06-03
申请号：US16951635
申请日：2020-11-18
Inventor： Yudai SHIBATA , Takeshi ABE , Shogo MOTEGI , Shintaro HAYASHI
Abstract: A light-emitting device includes: a laser light source that radiates primary light; a wavelength converting member that emits secondary light, the secondary light including wavelength-converted light, the wavelength-converted light being the primary light converted into light having more long-wavelength components than the primary light; a first light-guiding member that transmits the secondary light; and a second light-guiding member that transmits the secondary light, and in the light-emitting device, an exit face of the first light-guiding member and an entrance face of the second light-guiding member are in direct contact with each other, and each of a residual stress in the exit face of the first light-guiding member and a residual stress in the entrance face of the second light-guiding member decreases with distance from a center of an interface between the exit face of the first light-guiding member and the entrance face of the second light-guiding member.
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公开(公告)号：US20200173615A1
公开(公告)日：2020-06-04
申请号：US16639647
申请日：2018-07-25
Inventor： Takeshi ABE , Shozo OSHIO
Abstract: A light emitting device includes: a solid-state light emitting element that emits excitation light having a maximum intensity value within a wavelength range of 440 nm or more and less than 470 nm; and a wavelength conversion member composed by combining a first wavelength converter, which includes a first phosphor activated by Ce3+, and a second wavelength converter, which includes a second phosphor activated by Ce3+, with each other. The first phosphor emits first fluorescence having a maximum intensity value within a wavelength range of 470 nm or more and less than 530 nm, and the second phosphor emits second fluorescence having a maximum intensity value within a wavelength range of 580 nm or more and less than 660 nm. The first wavelength converter has a dispersed state in which particles of the first phosphor are not in contact with one another.
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公开(公告)号：US20190027656A1
公开(公告)日：2019-01-24
申请号：US16071906
申请日：2017-01-31
Inventor： Youshin LEE , Shozo OSHIO , Tatsuya OKUNO , Takeshi ABE , Masahiro NAKAMURA
CPC classification number: H01L33/502 , C09K11/08 , F21S2/00 , F21V9/30 , G02B5/20 , H01L33/16 , H01L33/50 , H01L33/58 , H01S5/022 , Y02B20/181
Abstract: A light emitting device 1 includes: a substrate 30; and a phosphor layer 40 composed in such a manner that a large number of phosphor particles 60 are adhered onto a flat surface 32 of the substrate 30. At least one of the phosphor particles 60 is a polyhedral phosphor particle 65 that is monodispersed, is derived from a crystal structure of garnet and has facets, and a median particle size D50 of the polyhedral phosphor particle 65 is 30 μm or more and a maximum thickness of the phosphor layer 40 or less. It is preferable that at least one of the phosphor particles 60 adhered onto the flat surface 32 of the substrate 30 is the polyhedral phosphor particle 65 that is monodispersed, is derived from the crystal structure of the garnet, and has the facets.
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公开(公告)号：US20180306410A1
公开(公告)日：2018-10-25
申请号：US15779348
申请日：2016-11-21
Inventor： Takeshi ABE , Shozo OSHIO
CPC classification number: F21V9/32 , F21V9/38 , G02B6/00 , G02B6/0005 , H01S5/022
Abstract: A light-emitting device includes a radiation source that radiates laser light as first primary light, and a first wavelength converter, and emits output light. The first wavelength converter has an incidence face on which the first primary light is incident, and an emission face through which the output light emits. A normal to the incidence face and a normal to the emission face are mutually different. A first phosphor included in the first wavelength converter is a single crystal phosphor.
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公开(公告)号：US20180163127A1
公开(公告)日：2018-06-14
申请号：US15577819
申请日：2016-07-15
Inventor： Shozo OSHIO , Takeshi ABE
CPC classification number: C09K11/7774 , C01F17/0025 , C01P2002/30 , C01P2002/72 , C01P2004/04 , C01P2004/60 , C01P2004/61 , C01P2006/60 , C01P2006/80 , H01L25/0753 , H01L33/502 , H01L33/56 , H01L33/62 , H01L2224/48091 , H01L2924/181 , H01L2933/0041 , H01L2933/005 , H01L2924/00014 , H01L2924/00012
Abstract: A garnet compound includes a single particle or an aggregation of single particles, each single particle having a particle shape derived from a crystal structure of garnet. The garnet compound has a composition represented by a general formula: A′3B′2(C′X4)3 (1) (where A′, B′, and C′ are cations forming the garnet compound, and X is an anion forming the garnet compound), neither B′ nor C′ containing iron as a main component. The single particle in the garnet compound has a particle size categorized as sand in geology. The garnet compound contains lead in an amount of 1000 ppm or less.
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