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公开(公告)号：US11525898B2
公开(公告)日：2022-12-13
申请号：US16900866
申请日：2020-06-12
Inventor： Seiji Nishiwaki
IPC: G01S7/48 , G01S7/481 , G02F1/295 , G02B27/28 , G01S7/4863 , G01S7/4865 , G01S17/08
Abstract: An optical device includes: a light source that emits laser light; an optical waveguide element positioned on the optical path of the laser light; a first member positioned on the optical path, and has a bottom surface that faces the optical waveguide element, and a side surface that is rotationally symmetric about the optical path; and a control circuit. The optical waveguide element includes: a first grating that includes a plurality of portions arranged in the radial direction and having mutually different refractive indices, and that causes a portion of the laser light that is incident to be propagated in the radial direction within the optical waveguide element; and a second grating that includes a plurality of portions arranged outside the first grating, arranged in the radial direction, and having mutually different refractive indices, and that causes light to be emitted from the optical waveguide element.
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公开(公告)号：US11112552B2
公开(公告)日：2021-09-07
申请号：US16840932
申请日：2020-04-06
Inventor： Seiji Nishiwaki , Bunzi Mizuno
Abstract: A light-guide sheet according to the present disclosure is a light-guide sheet that takes in incident light and waveguides light in a direction intersecting with an incident direction of the incident light inside the light-guide sheet. The light-guide sheet includes: a lower refractive index layer; a light-transmissive layer that is continuously stacked with the lower refractive index layer and has a refractive index that is higher than a refractive index of the lower refractive index layer; and a diffraction grating that is disposed on the light-transmissive layer and changes a travelling direction of the incident light. A pattern of the diffraction grating is divided into a plurality of partial patterns on the light-transmissive layer, and each of the plurality of partial patterns has a concentric circular shape or a concentric polygonal shape.
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公开(公告)号：US10088355B2
公开(公告)日：2018-10-02
申请号：US15459027
申请日：2017-03-15
Inventor： Seiji Nishiwaki , Kenji Narumi , Teruhiro Shiono
Abstract: A light detection device includes a light detector including a first detector and a second detector; a light coupling layer disposed on or above the light detector; and a polarizer array that is disposed on the light coupling layer. The light coupling layer includes a first low-refractive-index layer, a first high-refractive-index layer including a first grating and a second grating adjacent to the first grating, and a second low-refractive-index layer in this order. The polarizer array includes a first polarizer that transmits light polarized in one direction and a second polarizer that is adjacent to the first polarizer and blocks the light polarized in the one direction. The first grating and the first polarizer face the first detector, and the second grating and the second polarizer face the second detector.
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公开(公告)号：US09976904B2
公开(公告)日：2018-05-22
申请号：US15206266
申请日：2016-07-09
Inventor： Seiji Nishiwaki
CPC classification number: G01J3/4531 , G01J3/0205 , G01J3/0208 , G01J3/0229 , G01J3/10 , G01J2003/102 , G01J2003/104 , G01J2003/4538
Abstract: In one aspect, an apparatus includes a first light source that applies first light having a first wavelength as a center wavelength to an object, a second light source that applies second light having a second wavelength as a center wavelength longer than the first wavelength to the object, an optical filter that includes first and second regions and that transmits third light produced by the first and second light each passed through or reflected by the object, first and second optical detectors that determine first and second amounts, respectively, of the third light passed through the first and second regions. The transmission ranges of spectral transmission curves of the first and second regions are located between the first wavelength and the second wavelength. The spectral transmission curve of the first region has a width at half maximum different from that of the spectral transmission curve of the second region.
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公开(公告)号：US11947240B2
公开(公告)日：2024-04-02
申请号：US17324164
申请日：2021-05-19
Inventor： Seiji Nishiwaki
CPC classification number: G02F1/3138 , G02F1/295
Abstract: An optical apparatus includes a light source, an optical waveguide element, a light detector, and an optical system. The light source emits a light beam. The optical waveguide element includes first and second gratings. The first grating causes part of the light beam to propagate in the optical waveguide element as a guided light beam. The second grating causes part of the guided light beam to exit from the optical waveguide element. The optical system causes the light beam to enter the first grating and causes a reflected light beam from an object to enter the second grating. Part of the reflected light beam entering the second grating propagates in the optical waveguide element and exits from the first grating as an optical feedback beam. The optical system causes part of the optical feedback beam to enter the light detector as separated light beams separated depending on wavelength.
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Patent Agency Ranking
公开(公告)号：US10564371B2
公开(公告)日：2020-02-18
申请号：US16437494
申请日：2019-06-11
Inventor： Seiji Nishiwaki , Tohru Nakagawa , Tsuyoshi Yamamoto
IPC: G02B6/42 , H01L31/054 , G02B19/00 , H02S40/22 , G02B6/125 , G02B6/124 , G02B6/26 , G02B6/13 , G02B6/34
Abstract: A waveguide sheet captures incident light and waveguides the incident light in a direction intersecting with an incident direction. The waveguide sheet includes a diffraction grating layer that changes a traveling direction of the incident light and a plurality of first light-transmissive pairs. Each of the first light-transmissive pairs includes a first light-transmissive layer having a shape with first concave streaks and first convex streaks being repeatedly arranged in a first direction that is a direction intersecting with the incident direction, and a second light-transmissive layer laminated on the first light-transmissive layer. In the plurality of first light-transmissive pairs, the first light-transmissive layer is located closer to a side of the diffraction grating layer and each of the first concave streaks of another first light-transmissive layer is located between adjacent first convex streaks among the first convex streaks of the first light-transmissive layer as seen in the incident direction.
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公开(公告)号：US10088293B2
公开(公告)日：2018-10-02
申请号：US15459024
申请日：2017-03-15
Inventor： Seiji Nishiwaki , Kenji Narumi , Teruhiro Shiono
Abstract: A light detection device includes a light detector including first detectors and second detectors both disposed along a main surface; a light coupling layer disposed on or above the light detector; and a light shielding film disposed on the light coupling layer. The light coupling layer includes a first low-refractive-index layer, a first high-refractive-index layer that is disposed on the first low-refractive-index layer and includes a first grating, and a second low-refractive-index layer that is disposed on the first high-refractive-index layer. The light shielding film includes a light transmitting region and a light shielding region adjacent to the light transmitting region. The light transmitting region faces two or more first detectors included in the first detectors, and the light shielding region faces two or more second detectors included in the second detectors.
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公开(公告)号：US10082389B2
公开(公告)日：2018-09-25
申请号：US15447054
申请日：2017-03-01
Inventor： Kenji Narumi , Teruhiro Shiono , Seiji Nishiwaki
CPC classification number: G01B11/2441 , G01B9/02051 , G01J3/4532 , H01L27/14621 , H01L27/14623 , H01L27/14625
Abstract: A photodetection device comprises: an image sensor that includes first pixels, second pixels, third pixels, and fourth pixels; an interference element that includes first incident regions and second incident regions; and an optical system that causes light in a first wavelength band to be incident on the first incident regions and causes light in a second wavelength band different from the first wavelength band to be incident on the second incident regions. The interference element causes first interference of part of the light in the first wavelength band incident on two first incident regions that are included in the first incident regions. The interference element also causes second interference of part of the light in the second wavelength band incident on two second incident regions.
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公开(公告)号：US09857592B2
公开(公告)日：2018-01-02
申请号：US14859203
申请日：2015-09-18
Inventor： Takeyoshi Tokuhara , Seiji Nishiwaki , Tsuguhiro Korenaga , Yoshio Shimbo
CPC classification number: G02B27/0172 , G02B2027/0123 , G02B2027/0134 , G02B2027/0178 , G02C11/10
Abstract: A display device of the disclosure includes a projector including optical elements to project images on left or right eye of an observer and a frame connected to the projector for mounting on the observer. With the frame mounted on the observer, at least part of the projector is placed in visual fields of the eyes, and length from tangent point between leftmost one among lines of sight of the left eye overlapping outline of at least the part and the outline to intersection between an imaginary line through the tangent point parallel to direction of pupillary distance of the observer and rightmost one among lines of sight of the right eye overlapping the outline is shorter than the pupillary distance in a top plan view of the display device.
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公开(公告)号：US09645401B2
公开(公告)日：2017-05-09
申请号：US14955083
申请日：2015-12-01
Inventor： Seiji Nishiwaki , Takeyoshi Tokuhara , Yoshio Shimbo , Tsuguhiro Korenaga
CPC classification number: G02B27/2214 , G02B3/0043 , G02B17/0856 , G02B27/144 , H04N13/307 , H04N13/344 , H04N13/346
Abstract: An image display device according to an aspect of the present disclosure includes: a display including light-emitting elements arrayed two-dimensionally, and having regions, in each of which a part of the light-emitting elements is located; a mirror lens array including mirror lenses, each of the mirror lenses being disposed correspondingly to one of the regions, reflecting light from the regions, and forming virtual images; and a beam splitter disposed between the display and the mirror lens array, the beam splitter transmitting a part of the light from the regions in a direction of the mirror lens array and reflecting a part of reflected light from the mirror lens array.
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