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公开(公告)号：US11959632B2
公开(公告)日：2024-04-16
申请号：US17418278
申请日：2019-12-18
Inventor： Mitsuru Nitta , Shozo Oshio , Takeshi Abe
IPC: F21V9/30 , A61B5/00 , A61N5/06 , A61N5/067 , A61B1/04 , A61B1/06 , F21W131/20 , F21Y115/30
CPC classification number: F21V9/30 , A61B5/0071 , A61N5/062 , A61N5/067 , A61B1/043 , A61B1/0653 , F21W2131/20 , F21Y2115/30
Abstract: A light-emitting device includes: a light source that radiates primary light; and a first phosphor that absorbs the primary light and converts the primary light into first wavelength-converted light having a longer wavelength than the primary light, wherein the primary light is laser light, the first wavelength-converted light includes fluorescence based on electron energy transition of Cr3+, and a fluorescence spectrum of the first wavelength-converted light has a maximum fluorescence intensity value in region of a wavelength exceeding 710 nm.
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公开(公告)号：US11407942B2
公开(公告)日：2022-08-09
申请号：US16621204
申请日：2018-05-10
Inventor： Shozo Oshio , Takeshi Abe
Abstract: Garnet silicate is garnet silicate containing, as a main component, silicate represented by a general formula: Lu2CaMg2(SiO4)3. The garnet silicate includes primary particles having a particle shape derived from a crystal structure of garnet. Moreover, the garnet silicate further contains alkaline metal including at least lithium, in which a content of the alkaline metal is less than 2000 ppm. The garnet silicate phosphor includes garnet silicate and ions which are included in the garnet silicate and function as a light emission center. The wavelength converter includes the garnet silicate phosphor. A light emitting device includes the garnet silicate phosphor or the wavelength converter.
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公开(公告)号：US12100927B2
公开(公告)日：2024-09-24
申请号：US17613792
申请日：2020-04-21
Inventor： Mitsuru Nitta , Takeshi Abe , Shozo Oshio
CPC classification number: H01S5/0087 , A61B1/0653 , G02B23/2469
Abstract: A light emitting device includes a light source that emits a primary light having a light energy density exceeding 0.5W/mm2, and a first phosphor that absorbs the primary light to convert the primary light into a first wavelength-converted light having a wavelength longer than that of the primary light. The first phosphor includes a compound serving as a host, the compound being a simple oxide including one kind of metal element or a composite oxide including a plurality of different kinds of the simple oxide as an end member. When an energy conversion value at a peak wavelength of the primary light is E1 electron volts and an energy conversion value at a fluorescence peak wavelength of the first wavelength-converted light is E2 electron volts, a bandgap energy of a crystal of the simple oxide is larger than a sum of the E1 electron volts and the E2 electron volts.
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公开(公告)号：US11566175B2
公开(公告)日：2023-01-31
申请号：US16619148
申请日：2018-05-01
Inventor： Shozo Oshio , Takeshi Abe
Abstract: A wavelength converter 100 includes: a first phosphor 1 composed of an inorganic phosphor activated by Ce3+; and a second phosphor 2 composed of an inorganic phosphor activated by Ce3+ and different from the first phosphor. At least one of the first phosphor and the second phosphor is particulate. The first phosphor and the second phosphor are bonded to each other by at least one of a chemical reaction in a contact portion between the compound that constitutes the first phosphor and a compound that constitutes the second phosphor and of adhesion between the compound that constitutes the first phosphor and the compound that constitutes the second phosphor.
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公开(公告)号：US11480317B2
公开(公告)日：2022-10-25
申请号：US17409251
申请日：2021-08-23
Inventor： Toshiaki Takenaka , Shintaro Hayashi , Shogo Motegi , Yudai Shibata , Fumiya Yagi , Takeshi Abe
Abstract: A light source device includes a plurality of light sources; a condensing optical member; a fluorescent unit that converts at least a portion of the light from the light sources and condensed by the optical member into light including converted light and light from the light sources; and a sensor that detects an anomaly in the fluorescent unit, such sensor disposed within a circular area circumscribed by the light sources.
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Patent Agency Ranking
公开(公告)号：US11371675B2
公开(公告)日：2022-06-28
申请号：US17047220
申请日：2019-04-10
Inventor： Tatsuya Okuno , Takeshi Abe , Shozo Oshio
Abstract: Alight emitting device (A) includes a laser light source (1) that emits laser light (100), a housing (2A) that includes a bottom wall (3) and a side wall, and a first wavelength converter (20) provided on the side wall, the first wavelength converter (20) containing a first phosphor. The bottom wall of the housing is irradiated with the laser light emitted from the laser light source, and the first phosphor is excited by diffused light of the laser light diffused by the bottom wall. With such a configuration, the light emitting device (A) improves color uniformity and chromaticity flexibility while increasing power density of output light.
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公开(公告)号：US10533713B2
公开(公告)日：2020-01-14
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：US10355175B2
公开(公告)日：2019-07-16
申请号：US16071906
申请日：2017-01-31
Inventor： Youshin Lee , Shozo Oshio , Tatsuya Okuno , Takeshi Abe , Masahiro Nakamura
IPC: H01J1/62 , H01L33/50 , C09K11/08 , F21S2/00 , G02B5/20 , H01S5/022 , F21V9/30 , H01L33/16 , H01L33/58
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：US12232847B2
公开(公告)日：2025-02-25
申请号：US17604419
申请日：2020-02-19
Inventor： Takeshi Abe , Shozo Oshio , Mitsuru Nitta
Abstract: A wavelength converter includes a first phosphor activated with Cr3+; and a second phosphor activated with at least one ion of Ce3+ or Eu2+. A fluorescence spectrum of a fluorescence emitted by the second phosphor has a peak where a fluorescence intensity shows a maximum value in a wavelength range of 500 nm or more to less than 580 nm. The wavelength converter emits a fluorescence having a light component over an entire range of 500 nm or more to less than 580 nm. The wavelength converter emits a light having a spectrum in which a ratio of a minimum light emission intensity to a maximum light emission intensity is 40% or less in a wavelength range of 550 nm or more to 700 nm or less.
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公开(公告)号：US11280949B2
公开(公告)日：2022-03-22
申请号：US17100297
申请日：2020-11-20
Inventor： Yudai Shibata , Takeshi Abe , Shogo Motegi , Shintaro Hayashi
Abstract: A light-emitting device includes: a laser light source that radiates blue-based light as 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 emitted by the wavelength converting member; and a second light-guiding member which includes a resin material, and transmits the secondary light transmitted by the first light-guiding member, and the first light-guiding member and the second light-guiding member are connected by a connector, the connector including a numerical aperture (NA) converting member that optically connects a transmission path in the first light-guiding member and a transmission path in the second light-guiding member.
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