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公开(公告)号：US09203054B2
公开(公告)日：2015-12-01
申请号：US14560702
申请日：2014-12-04
Inventor： Taku Hirasawa , Yasuhisa Inada , Akira Hashiya , Yoshitaka Nakamura
CPC classification number: H01L51/5268 , G02B5/0252 , G02B5/1809 , G02B5/1866 , G02F1/133606 , H01L51/5275
Abstract: An optical sheet includes a light scattering layer that scatters at least a part of light incident thereon by diffraction and that includes first and second areas. Each first area is a projection. Each second area is a recess. Each of at least the projections or the recesses has a tapered shape. When a center wavelength of the light incident on the light scattering layer is λ and a refractive index of a layer that is in contact with the light scattering layer at a light emission side is n, spatial frequency components of a pattern formed by the first and second areas have a maximum peak at a spatial frequency in a range of 0.068/(λ×n) or more and 2.8/(λ×n) or less.
Abstract translation: 光学片包括光散射层，其散射通过衍射入射到其上的光的至少一部分，并且包括第一和第二区域。 每个第一个区域都是一个投影。 每个第二个区域都是一个凹槽。 至少突起或凹部中的每一个具有锥形形状。 当入射到光散射层上的光的中心波长为λ，并且在光出射侧与光散射层接触的层的折射率为n时，由第一和第二光源形成的图案的空间频率分量 第二区域在0.068 /（λ×n）以上且2.8 /（λ×n）以下的范围内的空间频率具有最大峰值。
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公开(公告)号：US12250838B2
公开(公告)日：2025-03-11
申请号：US17463637
申请日：2021-09-01
Inventor： Shinya Okamoto , Atsushi Ishikawa , Yasuhisa Inada
IPC: H01L31/0232 , B82Y30/00 , C25B1/04 , C25B11/04 , H01L31/0224 , H01L31/0352 , H01L31/108 , H10F77/14 , H10F77/20 , H10F77/40
Abstract: An optical device includes a nanostructure body which induces surface plasmon resonance when irradiated with light, an alloy layer which is in contact with the nanostructure body and which has a lower work function than the nanostructure body, and an n-type semiconductor which is in Schottky contact with the alloy layer. The nanostructure body is composed of one selected from the group consisting of elemental metals, alloys, metal nitrides, and conductive oxides. The alloy layer is composed of at least two metals.
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公开(公告)号：USRE50041E1
公开(公告)日：2024-07-16
申请号：US17364359
申请日：2021-06-30
Inventor： Taku Hirasawa , Yasuhisa Inada , Akira Hashiya , Nobuaki Nagao , Akira Tsujimoto
IPC: F21V9/30 , F21K9/64 , F21V5/04 , F21V5/10 , F21V7/30 , F21V9/40 , F21V13/14 , H01S5/00 , F21Y115/10 , F21Y115/30
CPC classification number: F21K9/64 , F21V5/04 , F21V5/10 , F21V7/30 , F21V9/40 , F21V13/14 , H01S5/00 , F21Y2115/10 , F21Y2115/30
Abstract: A light-emitting apparatus includes an excitation light source that emits first light; a light-emitting device on an optical path of the first light, the light-emitting device emitting second light having a wavelength in air; and a first converging lens on an optical path of the second light. The light-emitting device comprises: a photoluminescent layer that emits the second light by being excited by the first light; and a light-transmissive layer on the photoluminescent layer. At least one of the photoluminescent layer and the light-transmissive layer has a surface structure comprising projections or recesses arranged perpendicular to a thickness direction of the photoluminescent layer. At least one of the photoluminescent layer and the light-transmissive layer has a light emitting surface perpendicular to the thickness direction, the second light emitted from the light emitting surface. The surface structure limits the directional angle of the second light emittied from the light emitting surface.
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公开(公告)号：USRE49093E1
公开(公告)日：2022-06-07
申请号：US17152753
申请日：2021-01-19
Inventor： Nobuaki Nagao , Taku Hirasawa , Yasuhisa Inada , Mitsuru Nitta , Akira Hashiya , Yasuhiko Adachi
Abstract: A light-emitting apparatus includes; a light-emitting device including a photoluminescent layer that receives excitation light and emits light including first light having a wavelength λa in air, and a light-transmissive layer located on or near the photoluminescent layer; and an optical fiber that receives the light from the photoluminescent layer at one end of the optical fiber and emits the received light from the other end thereof. A surface structure is defined on at least one of the photoluminescent layer and the light-transmissive layer, and the surface structure has projections or recesses or both and limits a directional angle of the first light having the wavelength λa in air.
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公开(公告)号：US20220137480A1
公开(公告)日：2022-05-05
申请号：US17574493
申请日：2022-01-12
Inventor： Akira Hashiya , Yasuhisa Inada , Taku Hirasawa , Yoshikazu Yamaoka , Nobuaki Nagao
Abstract: An optical scanning device includes: a first waveguide that propagates light by total reflection; and a second waveguide. The second waveguide includes: a first multilayer reflective film; a second multilayer reflective film that faces the first multilayer reflective film; and a first optical waveguide layer directly connected to the first waveguide and located between the first and second multilayer reflective films. The first optical waveguide layer has a variable thickness and/or a variable refractive index and propagates the light transmitted through the first waveguide. The first multilayer reflective film has a higher light transmittance than the second multilayer reflective film and allows part of the light propagating through the first optical waveguide layer to be emitted to the outside. By changing the thickness of the first optical waveguide layer and/or its refractive index, the direction of the part of the light emitted from the second waveguide is changed.
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Patent Agency Ranking
公开(公告)号：US10714661B2
公开(公告)日：2020-07-14
申请号：US15933455
申请日：2018-03-23
Inventor： Mitsuru Nitta , Nobuaki Nagao , Yasuhisa Inada
Abstract: A light-emitting apparatus includes: a solid-state light source; and a wavelength convertor. The solid-state light source emits first light including green light with a peak wavelength in a range of 480 to 550 nm, inclusive. The wavelength convertor contains a red phosphor including Ce as a luminescent center. The red phosphor is excited by at least part of the green light to emit second light. The second light has a spectrum with a peak wavelength in a range of 600 to 700 nm, inclusive. The red phosphor contains a nitride or an oxynitride as a host material.
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公开(公告)号：US10662376B2
公开(公告)日：2020-05-26
申请号：US16190495
申请日：2018-11-14
Inventor： Mitsuru Nitta , Nobuaki Nagao , Yasuhisa Inada
IPC: H01L33/50 , C09K11/77 , C09K11/08 , F21V9/30 , F21Y115/30
Abstract: A phosphor comprises a crystal phase with a chemical composition (Lu1-p-q, Cep, Mq)xβyγzO. M denotes one or more elements selected from the group consisting of Y, La, Sc, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, and Yb. β contains Si, which constitutes 90% or more by mole of β. γ contains N, which constitutes 90% or more by mole of γ. The variables x, y, z, p, and q satisfy 5.5≤x≤6.5, 10.5≤y≤11.5, 19.5≤z≤20.5, 0
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公开(公告)号：US10012780B2
公开(公告)日：2018-07-03
申请号：US15215592
申请日：2016-07-21
Inventor： Yasuhisa Inada , Taku Hirasawa , Mitsuru Nitta , Akira Hashiya , Takeyuki Yamaki
CPC classification number: G02B6/0003 , G02B6/00 , G02B6/0035 , G02B6/0036 , G02B6/0038 , G02B6/0053 , G02B6/0058 , G02B6/0076 , G02B6/0083 , G02B6/0085 , G03B21/204 , H01L33/505 , H01L33/58
Abstract: A light-emitting device includes a photoluminescent layer and a light-transmissive layer located on the photoluminescent layer. At least one of the photoluminescent layer and the light-transmissive layer has a submicron structure having at least projections or recesses arranged perpendicular to the thickness direction of the photoluminescent layer. At least one of the photoluminescent layer and the light-transmissive layer has a light emitting surface. The first light has a wavelength λa in air. A distance Dint between adjacent projections or recesses and a refractive index nwav-a of the photoluminescent layer for the first light satisfy λa/nwav-a
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公开(公告)号：US09899577B2
公开(公告)日：2018-02-20
申请号：US15169771
申请日：2016-06-01
Inventor： Akira Hashiya , Taku Hirasawa , Yasuhisa Inada , Mikiko Matsuo
CPC classification number: H01L33/508 , H01L33/44
Abstract: A light-emitting apparatus comprising a photoluminescent layer that emits light in response to excitation light and has a light-emitting surface, the light from the photoluminescent layer being emitted through the light-emitting surface. The light-emitting surface includes a first region and a second region. The light from the photoluminescent layer includes first light having a wavelength λa in air. The first light emitted through the first region has a smaller directional angle than the first light emitted through the second region.
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公开(公告)号：US09618697B2
公开(公告)日：2017-04-11
申请号：US14621729
申请日：2015-02-13
Inventor： Yasuhisa Inada , Taku Hirasawa , Yoshitaka Nakamura , Akira Hashiya , Mitsuru Nitta , Takeyuki Yamaki
CPC classification number: G02B6/1225 , G02B6/124 , H01L2933/0083
Abstract: A light-emitting device includes a photoluminescent layer that emits light containing first light, a light-transmissive layer located on or near the photoluminescent layer, a low-refractive-index layer and a high-refractive-index layer. A submicron structure is defined on the photoluminescent layer and/or the light-transmissive layer. The low-refractive-index layer is located on or near the photoluminescent layer so that the photoluminescent layer is located between the low-refractive-index layer and light-transmissive layer. The high-refractive-index layer is located on or near the low-refractive-index layer so that the low-refractive-index layer is located between the high-refractive-index layer and the photoluminescent layer. The submicron structure includes at least projections or recesses and satisfies the following relationship: λa/nwav-a
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