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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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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：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：US11287571B2
公开(公告)日：2022-03-29
申请号：US16929405
申请日：2020-07-15
Inventor： Toshio Katsuyama , Akira Nakao
IPC: G02B6/12 , G02B6/26 , H04N9/31 , G02B6/293 , G03B21/20 , G02B6/125 , G02B6/124 , G02B6/122 , G02B6/42 , G02B27/01 , G02B6/00 , G02B26/10
Abstract: To provide a multiplexer that makes it possible to achieve a reduction in size and that minimizes the influence of the expansion of laser light on a multiplexing unit. A multiplexer is provided with a plurality of waveguides, multiplexing units that are provided at an intermediate location within the waveguides, and laser light sources, wherein: the first multiplexing unit is arranged at a position that is closest to the laser light sources; and the laser light sources that have an optical axis at a position that is separated from the transmission axis of the visible light that is introduced into the first multiplexing unit are arranged so that the optical axis is inclined with respect to the transmission axis and the outer periphery of laser light that expands at a predetermined expansion angle passes in front of the first multiplexing unit.
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公开(公告)号：US20210286127A1
公开(公告)日：2021-09-16
申请号：US17331916
申请日：2021-05-27
Inventor： Toshio Katsuyama , Akira Nakao
IPC: G02B6/12 , H04N9/31 , G02B6/293 , G03B21/20 , G02B6/125 , G02B6/124 , G02B6/122 , G02B6/42 , G02B27/01
Abstract: To provide a multiplexer that makes it possible to achieve a reduction in size and that minimizes the influence of the expansion of laser light on a multiplexing unit. A multiplexer is provided with a plurality of waveguides, multiplexing units that are provided at an intermediate location within the waveguides, and laser light sources, wherein: the first multiplexing unit is arranged at a position that is closest to the laser light sources; and the laser light sources that have an optical axis at a position that is separated from the transmission axis of the visible light that is introduced into the first multiplexing unit are arranged so that the optical axis is inclined with respect to the transmission axis and the outer periphery of laser light that expands at a predetermined expansion angle passes in front of the first multiplexing unit.
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Patent Agency Ranking
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：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：US11067792B2
公开(公告)日：2021-07-20
申请号：US16193084
申请日：2018-11-16
Inventor： Toshio Katsuyama , Ryoya Ishigami
Abstract: A two-dimensional optical scanning mirror device, a manufacturing method for the same, a two-dimensional optical scanning device and an image projector. A two-dimensional optical scanning mirror device includes a substrate, a movable mirror portion supported on the substrate in such a manner that two-dimension optical scanning is possible, a hard magnetic thin film provided in the movable mirror portion and a magnetic field generator that includes at least an alternating magnetic field generator for driving the movable mirror portion, where the hard magnetic thin film has a magnetization direction in a direction of a film plane, and the ratio of the magnetic field generated by the magnetic field generator relative to the coercive force of the hard magnetic thin film is 0.2 or lower.
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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：US10408999B2
公开(公告)日：2019-09-10
申请号：US16211879
申请日：2018-12-06
Inventor： Toshio Katsuyama , Akira Nakao
IPC: G02B6/12 , G02B6/26 , H04N9/31 , G02B6/293 , G02B26/10 , G03B21/20 , G02B6/125 , G02B6/124 , G02B6/122 , G02B6/42 , G02B6/00
Abstract: To provide a multiplexer that makes it possible to achieve a reduction in size and that minimizes the influence of the expansion of laser light on a multiplexing unit. A multiplexer is provided with a plurality of waveguides, multiplexing units that are provided at an intermediate location within the waveguides, and laser light sources, wherein: the first multiplexing unit is arranged at a position that is closest to the laser light sources; and the laser light sources that have an optical axis at a position that is separated from the transmission axis of the visible light that is introduced into the first multiplexing unit are arranged so that the optical axis is inclined with respect to the transmission axis and the outer periphery of laser light that expands at a predetermined expansion angle passes in front of the first multiplexing unit.
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