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公开(公告)号：US11435571B2
公开(公告)日：2022-09-06
申请号：US16901760
申请日：2020-06-15
发明人： Yasuhisa Inada , Akira Hashiya , Taku Hirasawa
摘要： An optical scanning device includes: a first mirror; a second mirror opposed to the first mirror; two non-waveguide regions sandwiched between the first mirror and the second mirror; an optical waveguide region disposed between the two non-waveguide regions; and two intermediate regions. The average refractive index of the optical waveguide region is higher than the average refractive index of each intermediate region. The average refractive index of each intermediate region is higher than the average refractive index of each non-waveguide region. The first mirror allows part of light propagating through the optical waveguide region to be emitted as emission light in a third direction. By changing the refractive index and/or thickness of the optical waveguide region, the third direction, which is the emission direction of the emission light, is changed.
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公开(公告)号：US10422990B2
公开(公告)日：2019-09-24
申请号：US16230414
申请日：2018-12-21
发明人： Yasuhisa Inada , Akira Hashiya , Taku Hirasawa
摘要： An optical scanning device including: a first mirror having a first reflecting surface; a second mirror having a second reflecting surface; two non-waveguide regions disposed between the first and second mirrors and that are spaced apart from each other in a first direction parallel to at least either the first reflecting surface or the second reflecting surface; and an optical waveguide region disposed between the first and second mirrors and that is sandwiched between the two non-waveguide regions. The optical waveguide region propagates light in a second direction that crosses the first direction. The optical waveguide region and the two non-waveguide regions include respective first regions in which a common material exists. The optical waveguide region or each of the two non-waveguide regions further includes a second region in which a first material having a refractive index different from the refractive index of the common material exists.
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公开(公告)号：US10094522B2
公开(公告)日：2018-10-09
申请号：US15446453
申请日：2017-03-01
发明人： Taku Hirasawa , Yasuhisa Inada , Akira Hashiya
摘要： A light-emitting device comprises a layered structure between a first layer and a second layer. The first layer has a refractive index n1 for first light having a wavelength λa in air. The second layer has a refractive index n2 for the first light. The layered structure comprises: a photoluminescent layer having a first surface facing the first layer and a second surface facing the second layer; and a surface structure disposed on at least one selected from the group consisting of the first surface and the second surface of the photoluminescent layer. The refractive index n1 and the refractive index n2 are lower than a refractive index nwav-a of the photoluminescent layer for the first light. The layered structure has an effective thickness to more strongly emit TE polarized light than TM polarized light.
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公开(公告)号：US09515239B2
公开(公告)日：2016-12-06
申请号：US14618591
申请日：2015-02-10
发明人： Yasuhisa Inada , Taku Hirasawa , Yoshitaka Nakamura , Akira Hashiya , Mitsuru Nitta , Takeyuki Yamaki
IPC分类号： H01L33/00 , H01L33/58 , H01L33/50 , H01L27/118 , H01L31/0232 , H01L31/12
CPC分类号： H01L33/58 , H01L31/02322 , H01L31/12 , H01L31/125 , H01L33/00 , H01L33/505 , H01L2027/11853
摘要： A light-emitting device includes a photoluminescent layer that emits light containing first light, and a light-transmissive layer located on or near the photoluminescent layer. A submicron structure is defined on at least one of the photoluminescent layer and the light-transmissive layer. The submicron structure includes at least projections or recesses. The submicron structure has spatial frequency components distributed at least from more than 0 to 2/Dint(min) as determined by two-dimensional Fourier transform of a pattern of the projections or recesses and satisfies the following relationship: 0.8Dint(min)
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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
CPC分类号： H01L51/5268 , G02B5/0252 , G02B5/1809 , G02B5/1866 , G02F1/133606 , H01L51/5275
摘要： 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.
摘要翻译： 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：US11644540B2
公开(公告)日：2023-05-09
申请号：US16568247
申请日：2019-09-12
CPC分类号： G01S7/4817 , G01S17/06 , G02F1/295 , G02F1/291
摘要： An optical scanning device includes: first and second mirrors; an optical waveguide layer disposed between the first and second mirrors; a pair of electrodes sandwiching the optical waveguide layer; and a driving circuit that applies a voltage to the pair of electrodes. The first mirror emits part of light propagating through the optical waveguide layer to the outside. The optical waveguide layer contains a liquid crystal material or an electrooptical material. The alignment direction of the liquid crystal material or the direction of a polarization axis of the electrooptical material is parallel or perpendicular to the direction in which the optical waveguide layer extends. The driving circuit applies the voltage to the pair of electrodes to change the refractive index of the liquid crystal material or the electrooptical material to thereby change the light emission direction.
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公开(公告)号：US20220317259A1
公开(公告)日：2022-10-06
申请号：US17806507
申请日：2022-06-13
发明人： Kenji Narumi , Akira Hashiya , Tokuzou Kiyohara
IPC分类号： G01S7/481 , F21V7/00 , G01S17/931
摘要： A light projection apparatus includes a first mirror and a second mirror facing each other and extending in a first direction and an optical waveguide layer being located between the first mirror and the second mirror, having a structure in which a refractive index and/or a thickness can be changed, and guiding light in the first direction. The first mirror has light transmissivity higher than that of the second mirror, at least part of the light propagating in the optical waveguide layer is emitted outside therefrom, and an emission angle of light to be emitted from the first mirror can be changed in a range from an angle θ1 to an angle θ2 (>θ1) by the refractive index and/or the thickness of the optical waveguide layer being changed. First light emitted at the angle θ1 is projected vertically downward relative to second light emitted at the angle θ2.
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公开(公告)号：US11256156B2
公开(公告)日：2022-02-22
申请号：US16108129
申请日：2018-08-22
摘要： 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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公开(公告)号：US10775506B2
公开(公告)日：2020-09-15
申请号：US15840468
申请日：2017-12-13
发明人： Taku Hirasawa , Yasuhisa Inada , Akira Hashiya
IPC分类号： G01S17/86 , G02F1/295 , G01S17/10 , G01S7/481 , G01S7/4865 , G01S17/89 , G01S17/42 , G01S7/4863
摘要： An imaging system includes a light-emitting device, an image sensor, and a control circuit. The light-emitting device includes a light source, a first waveguide that propagates light from the light source by means of total reflection, a second waveguide, and a first adjustment element. The control circuit causes the light source to repeatedly emit light pulses. Further, the control circuit causes at least some of the plurality of photo-detection cells to accumulate the signal charge in synchronization with the emission of the light pulses and thereby causes the image sensor to generate every first period of time a frame based on the signal charge thus accumulated. Furthermore, the control circuit causes the first adjustment element to change the direction of the emitted light from the second waveguide every second period of time that is shorter than or equal to half the first period of time.
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公开(公告)号：US10031276B2
公开(公告)日：2018-07-24
申请号：US15060564
申请日：2016-03-03
发明人： Taku Hirasawa , Yasuhisa Inada , Akira Hashiya , Mitsuru Nitta , Takeyuki Yamaki
摘要： A display apparatus includes an excitation light source that outputs excitation light; a light-emitting device including a photoluminescent layer that receives the 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 shutter on an optical path of the light emitted from the photoluminescent layer. 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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