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公开(公告)号：US20180184059A1
公开(公告)日：2018-06-28
申请号：US15579759
申请日：2016-04-26
Applicant: QD LASER, INC. , THE UNIVERSITY OF TOKYO
Inventor： Yasuhiko ARAKAWA , Mitsuru SUGAWARA , Makoto SUZUKI , Shuichi TOJO
CPC classification number: H04N9/3194 , G02B26/0833 , G02B26/101 , G02B27/0172 , G02B27/108 , G02B2027/0178 , H04N9/312 , H04N9/3135
Abstract: An image projection device includes: a first mirror oscillating to scan an image light beam forming an image projected onto a retina of a user; a light source emitting the image light beam and a detection light beam to the first mirror at different timings; a second mirror having a first region reflecting-the image light beam reflected by the first mirror to the retina and a second region reflecting the detection light beam reflected by the first mirror in a direction different from a direction in which the image light beam is reflected, and scanning neither the image light beam nor the detection light beam reflected by the first mirror; a detector detecting the detection light beam reflected by the second region; and a controller adjusting oscillation of the first mirror and an emission timing of the image light beam based on a detection result by the detector.
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公开(公告)号：US20180164595A1
公开(公告)日：2018-06-14
申请号：US15579750
申请日：2016-04-26
Applicant: QD LASER, INC. , THE UNIVERSITY OF TOKYO
Inventor： Yasuhiko ARAKAWA , Mitsuru SUGAWARA , Makoto SUZUKI , Michio ARAI
CPC classification number: G02B27/024 , G02B17/06 , G02B26/105 , G02B27/0093 , G02B27/017 , G02B27/0977 , G02B2027/0187 , G09G3/002 , G09G3/346 , G09G5/00
Abstract: An image projection device includes: one light source unit emitting an image light beam, which forms an image, of visible light and a checking light beam of visible light; an optical system projecting the image light beam emitted from the one light source unit onto a first surface region of an eye of a user to project the image light beam onto a retina of the user, and projecting the checking light beam emitted from the one light source unit onto a second surface region, which is distant from the first surface region, of the eye of the user; a light detector detecting a reflected light that is the checking light beam reflected by the eye of the user; and a controller controlling at least one of the one light source unit and the optical system based on a detection result of the reflected light by the light detector.
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公开(公告)号：US20180364489A1
公开(公告)日：2018-12-20
申请号：US16115398
申请日：2018-08-28
Applicant: QD LASER INC. , THE UNIVERSITY OF TOKYO
Inventor： Yasuhiko ARAKAWA , Mitsuru SUGAWARA , Makoto SUZUKI
Abstract: The present invention is an image projection device that includes: a light source 12 that emits a laser beam 34; a scanning mirror 14 that two-dimensionally scans the laser beam 34 emitted from the light source 12; and a projection mirror 24 that projects scanned light onto a retina 26 of an eyeball 22 of a user to project an image onto the retina 26, the scanned light being composed of the laser beam 34 that has been scanned by the scanning mirror 14, wherein the laser beam 34 emitted from the light source 12 is scanned by using a part of an operating range of the scanning mirror 14.
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公开(公告)号：US20160103324A1
公开(公告)日：2016-04-14
申请号：US14893278
申请日：2014-04-25
Applicant: THE UNIVERSITY OF TOKYO , QD LASER, INC.
Inventor： Yasuhiko ARAKAWA , Mitsuru SUGAWARA , Makoto SUZUKI
CPC classification number: G02B27/0172 , G02B26/101 , G02B26/105 , G02B27/0101 , G02B2027/011 , G02B2027/0178 , G02C11/10 , G09G3/025 , G09G5/10 , H04N3/30 , H04N5/66 , H04N9/3179
Abstract: The present invention is an image projection device that includes: a light source 12 that emits a laser beam 34; a scanning mirror 14 that two-dimensionally scans the laser beam 34 emitted from the light source 12; and a projection mirror 24 that projects scanned light onto a retina 26 of an eyeball 22 of a user to project an image onto the retina 26, the scanned light being composed of the laser beam 34 that has been scanned by the scanning mirror 14, wherein the laser beam 34 emitted from the light source 12 is scanned by using a part of an operating range of the scanning mirror 14.
Abstract translation: 本发明是一种图像投影装置，包括：发射激光束34的光源12; 对从光源12发射的激光束34进行二维扫描的扫描镜14; 以及投影镜24，其将扫描光投影到用户的眼球22的视网膜26上以将图像投影到视网膜26上，扫描光由已被扫描反射镜14扫描的激光束34组成，其中 通过使用扫描反射镜14的工作范围的一部分来扫描从光源12发射的激光束34。
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公开(公告)号：US20190393373A1
公开(公告)日：2019-12-26
申请号：US16441048
申请日：2019-06-14
Applicant: Sharp Kabushiki Kaisha , The University of Tokyo
Inventor： Hirofumi YOSHIKAWA , Takahiro DOE , Yasuhiko ARAKAWA
IPC: H01L31/101 , H01L31/0304 , H01L31/0352
Abstract: A high detectivity infrared photodetector is provided. An infrared photodetector 10 includes n-type semiconductor layers 3 and 5 and a photoelectric conversion layer 4. The photoelectric conversion layer 4 includes quantum dots 411, a barrier layer 42, and a single-sided barrier layer 43. The single-sided barrier layer 43 is inserted between the barrier layer 42 and the n-type semiconductor layer 5 and has a wider band gap than does the barrier layer 42. Letting y be an energy level difference between the bottom of the conduction band of the single-sided barrier layer 43 and the bottom of the conduction band of the n-type semiconductor layer 5, z be a voltage in volts applied to the photoelectric conversion layer 4, and d be a thickness in nanometers of the photoelectric conversion layer 4, the infrared photodetector 10 satisfies y≥27×exp(0.64×z/(d×10000)).
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Patent Agency Ranking
公开(公告)号：US20180172508A1
公开(公告)日：2018-06-21
申请号：US15843144
申请日：2017-12-15
Applicant: Sharp Kabushiki Kaisha , The University of Tokyo
Inventor： Teruhisa KOTANI , Hirofumi YOSHIKAWA , Tazuko KITAZAWA , Yasuhiko ARAKAWA , Jinkwan KWOEN
IPC: G01J1/44 , G01N21/3504 , H01L31/0352 , H01L31/0304
CPC classification number: G01J1/44 , G01J1/0228 , G01J1/4228 , G01J5/026 , G01J5/20 , G01J2001/444 , G01J2005/0048 , G01N21/3504 , H01L27/14669 , H01L27/14694 , H01L31/02019 , H01L31/03046 , H01L31/035218 , H01L31/035236 , H01L31/101 , Y02E10/544
Abstract: A detector includes an active layer containing a quantum well or quantum dots and the detector can shift a detection wavelength by applying a voltage to the active layer. The detector has a reference wavelength to be referred to as a criterion for calibration or correction of the detection wavelength within a range in which the detection wavelength is shifted. A method of calibrating or correcting with the detector, a detection wavelength with the reference wavelength being defined as the criterion is provided.
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公开(公告)号：US20170338627A1
公开(公告)日：2017-11-23
申请号：US15599620
申请日：2017-05-19
Applicant: Sharp Kabushiki Kaisha , The University of Tokyo
Inventor： Teruhisa KOTANI , Yasuhiko ARAKAWA
CPC classification number: H01S5/3421 , H01S5/1096 , H01S5/18397 , H01S5/2018 , H01S5/22 , H01S5/34 , H01S5/3402 , H01S5/3408 , H01S5/3415 , H01S5/34306 , H01S5/34313 , H01S5/34333 , H01S2301/166 , H01S2301/173 , H01S2302/02
Abstract: A quantum cascade laser includes a semiconductor substrate and an active layer having a cascade structure, in which unit layered bodies, each composed of a quantum well light emitting layer and an injection layer, are stacked, wherein the unit layered body has a subband level structure having an upper laser level, a lower laser level, and a relaxation miniband composed of at least two energy levels with an energy spacing smaller than the energy difference (EUL) between the upper laser level and the lower laser level, the energy width of the relaxation miniband is smaller than the energy (ELO−EUL) obtained by subtracting the energy difference (EUL) from the energy (ELO) of longitudinal optical phonons, and electrons subjected to the intersubband transition are relaxed in the relaxation miniband and are injected into a quantum well light emitting layer in a subsequent unit layered body.
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公开(公告)号：US20170201072A1
公开(公告)日：2017-07-13
申请号：US15378089
申请日：2016-12-14
Applicant: Sharp Kabushiki Kaisha , The University of Tokyo
Inventor： Teruhisa KOTANI , Yasuhiko ARAKAWA
CPC classification number: H01S5/3401 , H01L33/16 , H01L33/32 , H01S5/0421 , H01S5/305 , H01S5/3201 , H01S5/3202 , H01S5/3215 , H01S5/3218 , H01S5/3407 , H01S5/3422 , H01S5/34333 , H01S2301/173 , H01S2302/02
Abstract: A nitride semiconductor device includes a GaN substrate in which an angle between a principal surface and an m-plane of GaN is −5° or more and +5° or less, a first intermediate layer disposed on the principal surface of the substrate and made of AlzGa(1-z)N (0≦z≦1), and a second intermediate layer disposed on a principal surface of the first intermediate layer, having an Al content different from that of the first intermediate layer, and made of Alx1Iny1Ga(1-x1-y1) (0≦x1≦1, 0≦y1≦1). A quantum cascade laser includes the nitride semiconductor device.
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公开(公告)号：US20200173848A1
公开(公告)日：2020-06-04
申请号：US16785687
申请日：2020-02-10
Applicant: Sharp Kabushiki Kaisha , The University of Tokyo
Inventor： Teruhisa KOTANI , Hirofumi YOSHIKAWA , Tazuko KITAZAWA , Yasuhiko ARAKAWA , Jinkwan KWOEN
IPC: G01J1/44 , G01N21/3504 , H01L31/0304 , H01L31/0352 , H01L31/101 , H01L27/146 , G01J5/20 , H01L31/02 , G01J1/42 , G01J5/02 , G01J1/02
Abstract: A detector includes an active layer containing a quantum well or quantum dots and the detector can shift a detection wavelength by applying a voltage to the active layer. The detector has a reference wavelength to be referred to as a criterion for calibration or correction of the detection wavelength within a range in which the detection wavelength is shifted. A method of calibrating or correcting with the detector, a detection wavelength with the reference wavelength being defined as the criterion is provided.
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10.发明申请公开(公告)号：US20180006174A1
公开(公告)日：2018-01-04
申请号：US15632523
申请日：2017-06-26
Applicant: Sharp Kabushiki Kaisha , The University of Tokyo
Inventor： Hirofumi YOSHIKAWA , Makoto IZUMI , Yasuhiko ARAKAWA , Takeo KAGEYAMA
IPC: H01L31/0352 , H01L31/0232 , H01L21/02 , H01L31/0224 , H01L31/101 , H01L31/06
CPC classification number: H01L31/035218 , H01L21/02505 , H01L31/022466 , H01L31/02327 , H01L31/03044 , H01L31/03046 , H01L31/0547 , H01L31/06 , H01L31/0735 , H01L31/101 , Y02E10/52 , Y02E10/544
Abstract: A photoelectric conversion element includes a buffer layer, a BSF layer, a base layer, a photoelectric conversion layer, an emitter layer, a window layer, a contact layer, and a p-type electrode sequentially on one surface of a substrate, and includes an n-type electrode on the other surface of the substrate. The photoelectric conversion layer has at least one quantum dot layer. The at least one quantum dot layer includes a quantum dot and a barrier layer. A photoelectric conversion member including the buffer layer, the BSF layer, the base layer, the photoelectric conversion layer, the emitter layer, the window layer, and the contact layer has an edge of incidence that receives light in an oblique direction relative to the growth direction of the quantum dot. A concentrator concentrates sunlight and causes the concentrated sunlight to enter the photoelectric conversion member from the edge of incidence.
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