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公开(公告)号：US20150171373A1
公开(公告)日：2015-06-18
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 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：US20210165081A1
公开(公告)日：2021-06-03
申请号：US17154402
申请日：2021-01-21
Inventor： HIROYUKI TAKAGI , TAKU HIRASAWA , AKIRA HASHIYA , YASUHISA INADA
Abstract: An optical device includes a first mirror, a second mirror facing the first mirror, an optical waveguide layer, located between the first mirror and the second mirror, that contains a material whose refractive index changes when a voltage is applied, first and second electrodes directly or indirectly holding the optical waveguide layer therebetween, the first electrode including a plurality of electrode sections arranged in a first direction, and a control circuit. The light is emitted via the first mirror from the optical waveguide layer, or the light is taken into the optical waveguide layer via the first mirror.
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公开(公告)号：US20200003873A1
公开(公告)日：2020-01-02
申请号：US16568247
申请日：2019-09-12
Inventor： NOBUAKI NAGAO , YOSHIKAZU YAMAOKA , YASUHISA INADA , AKIRA HASHIYA , TAKU HIRASAWA
Abstract: 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 has a higher light transmittance than the second mirror and 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：US20190355862A1
公开(公告)日：2019-11-21
申请号：US16529420
申请日：2019-08-01
Inventor： SHINYA OKAMOTO , SATOSHI YOTSUHASHI , TAKU HIRASAWA
IPC: H01L31/108 , H01L31/07 , H01L31/0224 , C25B11/04 , C25B9/08 , C25B1/10 , C25B1/00 , B82Y30/00
Abstract: An optical device includes an intermetallic compound of a first metal and a second metal having a lower work function than the first metal, or a solid-solution alloy of the first metal and the second metal and includes an n-type semiconductor in Schottky junction with the intermetallic compound or the solid-solution alloy.
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公开(公告)号：US20190049562A1
公开(公告)日：2019-02-14
申请号：US16019444
申请日：2018-06-26
Inventor： TAKU HIRASAWA , HIDEKAZU ARASE , YASUHISA INADA
Abstract: An optical scanning device comprises: a first mirror that has a first reflecting surface; a second mirror that has a second reflecting surface, and that faces the first mirror; an optical waveguide region that is disposed between the first mirror and the second mirror and that propagates light in a direction parallel to at least either the first reflecting surface or the second reflecting surface; and a first adjusting element that changes at least either an average refractive index of the optical waveguide region or a thickness of the optical waveguide region. The optical waveguide region contains a liquid. Each of the first and second mirrors includes a portion in contact with the optical waveguide region.
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Patent Agency Ranking
公开(公告)号：US20190033574A1
公开(公告)日：2019-01-31
申请号：US16015225
申请日：2018-06-22
Inventor： YASUHISA INADA , AKIRA HASHIYA , TAKU HIRASAWA
Abstract: An optical scanning device includes: a first mirror; a second mirror; two non-waveguide regions; an optical waveguide region; and a first adjusting element. The optical waveguide region propagates light. 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 a refractive index of the common material exists. The first mirror allows part of the light propagating through the optical waveguide region to be emitted through the first mirror. The first adjusting element changes at least either the average refractive index of the optical waveguide region or a thickness of the optical waveguide region to change a direction of the light emitted through the first mirror.
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公开(公告)号：US20160327717A1
公开(公告)日：2016-11-10
申请号：US15215599
申请日：2016-07-21
Inventor： AKIRA HASHIYA , TAKU HIRASAWA , YASUHISA INADA , YOSHITAKA NAKAMURA , MITSURU NITTA , TAKEYUKI YAMAKI , MASAHIRO NAKAMURA
IPC: F21V8/00
CPC classification number: G02B6/0003 , G02B5/1809 , G02B6/0025 , G02B6/0036 , G02B6/0038 , G02B6/0055 , G02B6/0056 , H01L33/508
Abstract: A light-emitting device includes a photoluminescent layer emitting light in response to excitation light, a light-transmissive layer located on the photoluminescent layer, and a light guide guiding the excitation light to 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. The light emitted from the photoluminescent layer includes first light having a wavelength λa in air. The distance Dint between adjacent projections or recesses and the refractive index nwav-a of the photoluminescent layer for the first light satisfy λa/nwav-a
Abstract translation: 发光装置包括响应于激发光发光的光致发光层，位于光致发光层上的透光层和将激发光引导到光致发光层的光导。 光致发光层和透光层中的至少一个具有至少具有垂直于光致发光层的厚度方向布置的突起或凹陷的亚微米结构。 从光致发光层发射的光包括在空气中具有波长λa的第一光。 相邻的凸部或凹部之间的距离Dint以及第一光的光致发光层的折射率nwav-a满足λa/ nwav-a
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公开(公告)号：US20190004393A1
公开(公告)日：2019-01-03
申请号：US16108129
申请日：2018-08-22
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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公开(公告)号：US20180372951A1
公开(公告)日：2018-12-27
申请号：US16116499
申请日：2018-08-29
Inventor： AKIRA HASHIYA , YASUHISA INADA , TAKU HIRASAWA , YOSHIKAZU YAMAOKA , NOBUAKI NAGAO
Abstract: An optical scanning device includes a waveguide array including a plurality of waveguides arranged in a first direction. Each waveguide includes: an optical waveguide layer that propagates light supplied to the waveguide in a second direction intersecting the first direction; a first mirror having a first reflecting surface intersecting a third direction; and a second mirror having a second reflecting surface that faces the first reflecting surface. The optical waveguide layer is located between the first and second mirrors and has a variable thickness and/or a variable refractive index for the light. The width of the first mirror and the width of the second mirror are each larger than the width of the optical waveguide layer. The first mirror has a higher light transmittance than the second mirror and allows part of the light propagating through the optical waveguide layer to be emitted in the third direction.
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公开(公告)号：US20180217258A1
公开(公告)日：2018-08-02
申请号：US15840468
申请日：2017-12-13
Inventor： TAKU HIRASAWA , YASUHISA INADA , AKIRA HASHIYA
Abstract: 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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