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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
Inventor： Nobuaki Nagao , Yoshikazu Yamaoka , Yasuhisa Inada , Akira Hashiya , Taku Hirasawa
CPC classification number: G01S7/4817 , G01S17/06 , G02F1/295 , G02F1/291
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 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
Inventor： Kenji Narumi , Akira Hashiya , Tokuzou Kiyohara
IPC: G01S7/481 , F21V7/00 , G01S17/931
Abstract: 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
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：US10775506B2
公开(公告)日：2020-09-15
申请号：US15840468
申请日：2017-12-13
Inventor： Taku Hirasawa , Yasuhisa Inada , Akira Hashiya
IPC: G01S17/86 , G02F1/295 , G01S17/10 , G01S7/481 , G01S7/4865 , G01S17/89 , G01S17/42 , G01S7/4863
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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公开(公告)号：US10031276B2
公开(公告)日：2018-07-24
申请号：US15060564
申请日：2016-03-03
Inventor： Taku Hirasawa , Yasuhisa Inada , Akira Hashiya , Mitsuru Nitta , Takeyuki Yamaki
Abstract: 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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Patent Agency Ranking
公开(公告)号：US20250020917A1
公开(公告)日：2025-01-16
申请号：US18899205
申请日：2024-09-27
Inventor： Hiroyuki SHOBAYASHI , Satoshi Kuzuhara , Kazuhiro Minami , Hiroaki Okayama , Akira Hashiya
Abstract: An optical system includes an incidence part changing a traveling direction of the incident image light from a display part and an expansion part that divides and duplicates the image light traveling from the incidence part. The expansion part includes a first and a second expansion part. The first expansion part includes a first and a second diffraction structure part each having a diffraction structure that divides and duplicates the image light along a first direction, and a non-diffraction structure part disposed between the first and the second diffraction structure part. The second expansion part includes a third diffraction structure part that divides and duplicates image light along the first direction. The third diffraction structure part is disposed to overlap with the non-diffraction structure part of the first expansion part in a vertical direction with respect to the pupil expansion part.
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公开(公告)号：US12147094B2
公开(公告)日：2024-11-19
申请号：US17807741
申请日：2022-06-20
Inventor： Akira Hashiya , Yasuhisa Inada , Kazuki Nakamura
Abstract: An optical device includes a plurality of optical waveguides, and a planar optical waveguide. The plurality of optical waveguides each extend in a first direction, and are arranged in a second direction intersecting the first direction. The planar optical waveguide is connected directly or indirectly with the plurality of optical waveguides. The plurality of optical waveguides each allow light to propagate in the first direction. The planar optical waveguide includes a first mirror and a second mirror, and an optical waveguide layer. The first mirror and the second mirror face each other, and extend in the first direction and the second direction. The optical waveguide layer is located between the first mirror and the second mirror.
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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
Inventor： Yasuhisa Inada , Akira Hashiya , Taku Hirasawa
Abstract: 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
Inventor： Yasuhisa Inada , Akira Hashiya , Taku Hirasawa
Abstract: 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
Inventor： Taku Hirasawa , Yasuhisa Inada , Akira Hashiya
Abstract: 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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