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公开(公告)号：US12105326B2
公开(公告)日：2024-10-01
申请号：US17909078
申请日：2021-02-26
Applicant: SEIREN KST CORP. , UNIVERSITY OF FUKUI
Inventor： Akira Himeno , Koichi Horii , Toshio Katsuyama , Shoji Yamada , Akira Nakao
IPC: G02B6/293
CPC classification number: G02B6/2938
Abstract: An optical multiplexer reduced in background light and reduced in size is provided. The optical multiplexer takes a plurality of light beams having different wavelengths as input from respective waveguides, and outputs multiple light obtained by multiplexing the plurality of light beams by a directional coupler. Background light is reduced by a reflection groove which reflects excess light outputted from a discard port of the directional coupler, and downsizing of the optical multiplexer is achieved.
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公开(公告)号：US20210149110A1
公开(公告)日：2021-05-20
申请号：US17159476
申请日：2021-01-27
Applicant: University of Fukui
Inventor： Toshio Katsuyama , Shoji Yamada
Abstract: The invention relates to an optical waveguide-type optical multiplexer, an optical waveguide-type multiplexing light source device and an image projection device, where the intensity of a light beam emitted from a light source is attenuated to a desired value without installing an additional optical attenuator element. One of a plurality of optical waveguides on the light emission side for emitting light distributed/multiplexed in an optical multiplexer unit excluding an optical waveguide on the light emission side in which the greatest output light power can be gained for each wavelength from among the optical waveguides on the light emission side in the case where a plurality of light sources is driven is used as an optical waveguide for light emission.
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公开(公告)号：US12174381B2
公开(公告)日：2024-12-24
申请号：US17634404
申请日：2020-12-17
Applicant: UNIVERSITY OF FUKUI
Inventor： Shoji Yamada , Toshio Katsuyama , Akira Nakao
Abstract: A retinal scanning display device including an optical system emits laser light to a pupil of a user, an optical multiplexer individually receives types of laser light having different wavelengths emitted from a plurality of semiconductor lasers, which combines the types of laser light coaxially to output the combined laser light. On the optical multiplexer, a beam shaper shapes the combined laser light into a light beam having a predetermined divergence or convergence angle, and a direction-of-emission changer changes image signal corresponding to an image to be formed, the direction of emission of the light beam output through the beam shaper within at least a plane intersecting the direction of emission. Then, an optical engine formed with the semiconductor lasers, the optical multiplexer, the beam shaper and the direction-of-emission changer guides the laser light emitted from the direction-of-emission changer to the position of the pupil of the user.
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公开(公告)号：US20200033590A1
公开(公告)日：2020-01-30
申请号：US16589661
申请日：2019-10-01
Applicant: University of Fukui
Inventor： Toshio Katsuyama , Shoji Yamada
Abstract: This invention is provided with: a light source; a light scanning mirror; a measurement mechanism for measuring a change in the intensity of light reflected from an eyeball as time elapses through the scanning of at least a surface of the pupil with a light beam by means of the light scanning mirror; a sampling mechanism for sampling the intensity of light reflected from the pupil from the measured change in the intensity of the reflected light as time elapses; and a mechanism for detecting the size and the position of the pupil by synchronizing the sampled intensity of light reflected from the pupil, and the scanning time during which the surface of the eyeball is scanned; and an image generating mechanism for forming an image on the retina of the eyeball by projecting a light beam for generating an image onto the pupil in the detected position while scanning.
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公开(公告)号：US12050342B2
公开(公告)日：2024-07-30
申请号：US17605871
申请日：2021-02-05
Applicant: University of Fukui
Inventor： Akira Nakao , Toshio Katsuyama , Shoji Yamada , Hitoshi Higuchi
CPC classification number: G02B6/12007 , G02B6/125
Abstract: An optical multiplexer and an optical multiplexing method capable of multiplexing light of four or more types of wavelengths are provided. An optical multiplexer capable of multiplexing light of a plurality of wavelengths includes a plurality of coupling parts each including a pair of main entrance paths, a pair of main exit paths, and a main coupler arranged between the main entrance paths and the main exit paths, the main coupler causing light entering from the main entrance paths to be coupled and exit from the main exit paths, in which one of the main entrance paths of the coupling parts is joined to one of the main exit paths of anther coupling parts and the main coupler has coupling length different from at least one other main coupler.
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Patent Agency Ranking
公开(公告)号：US20210149111A1
公开(公告)日：2021-05-20
申请号：US17159643
申请日：2021-01-27
Applicant: University of Fukui
Inventor： Toshio Katsuyama , Shoji Yamada
Abstract: The invention relates to an optical multiplexer, a light source module, a two-dimensional optical scanning device and an image projection device, where the effects of stray light that has failed to enter into an input optical waveguide can be reduced. Light that is in or below the range of 2.5 times greater than the full width at half maximum of the light intensity distribution of a light beam that has not been inputted into an optical waveguide from among the respective light beams that have been inputted into the input ends of the plurality of input optical waveguides is prevented from overlapping with the multiplexed light outputted from the output optical waveguide in the output end of the output optical waveguide.
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公开(公告)号：US11895442B2
公开(公告)日：2024-02-06
申请号：US17469082
申请日：2021-09-08
Applicant: University of Fukui
Inventor： Toshio Katsuyama , Shoji Yamada , Akira Nakao
IPC: H04N9/31 , F21V5/04 , F21Y115/00 , F21Y113/10
CPC classification number: H04N9/3129 , F21V5/04 , H04N9/3152 , H04N9/3161 , F21Y2113/10 , F21Y2115/00
Abstract: Provided is a light beam emission device and a light beam projection device, that are downsizable, have a simple configuration, and simplify complicated processing of video signals, such as the timing adjustment of video output signals, without generating color irregularity. The devices include: a plurality of light sources; and a condensing member. A range in the light source array direction, in which emission spots of the light beams emitted from the plurality of light sources respectively exist, is within a size in the array direction of a light beam, immediately after the light beam emitted from an emission spot located most closely to the center of the plurality of light sources, with respect to the condensing member, passed through the condensing member.
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公开(公告)号：US11307405B2
公开(公告)日：2022-04-19
申请号：US16589661
申请日：2019-10-01
Applicant: University of Fukui
Inventor： Toshio Katsuyama , Shoji Yamada
Abstract: This invention is provided with: a light source; a light scanning mirror; a measurement mechanism for measuring a change in the intensity of light reflected from an eyeball as time elapses through the scanning of at least a surface of the pupil with a light beam by means of the light scanning mirror; a sampling mechanism for sampling the intensity of light reflected from the pupil from the measured change in the intensity of the reflected light as time elapses; and a mechanism for detecting the size and the position of the pupil by synchronizing the sampled intensity of light reflected from the pupil, and the scanning time during which the surface of the eyeball is scanned; and an image generating mechanism for forming an image on the retina of the eyeball by projecting a light beam for generating an image onto the pupil in the detected position while scanning.
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公开(公告)号：US20220021854A1
公开(公告)日：2022-01-20
申请号：US17469082
申请日：2021-09-08
Applicant: University of Fukui
Inventor： Toshio Katsuyama , Shoji Yamada , Akira Nakao
Abstract: Provided is a light beam emission device and a light beam projection device, that are downsizable, have a simple configuration, and simplify complicated processing of video signals, such as the timing adjustment of video output signals, without generating color irregularity. The devices include: a plurality of light sources; and a condensing member. A range in the light source array direction, in which emission spots of the light beams emitted from the plurality of light sources respectively exist, is within a size in the array direction of a light beam, immediately after the light beam emitted from an emission spot located most closely to the center of the plurality of light sources, with respect to the condensing member, passed through the condensing member.
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公开(公告)号：US20210400244A1
公开(公告)日：2021-12-23
申请号：US17464118
申请日：2021-09-01
Applicant: University of Fukui
Inventor： Toshio Katsuyama , Shoji Yamada , Akira Nakao
Abstract: The present invention relates to an optical scanning type video projection device that decreases the height of the optical scanning type video projection device by improving the disposition of a light source module device and an optical scanning mirror device. The optical scanning type video projection device has: a first substrate on which an optical waveguide type multiplexer having a plurality of optical waveguides and a light multiplexer is provided; a second substrate on which an optical scanning mirror device having a movable mirror is provided; and an optical member configured to guide a light beam emitted from the optical waveguide type multiplexer to the movable mirror in a direction that is different from an emitting direction of the light beam. The first substrate and the second substrate are disposed in parallel with each other.
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