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公开(公告)号：US11940647B2
公开(公告)日：2024-03-26
申请号：US18363188
申请日：2023-08-01
Inventor： Yosuke Araki , Wahei Agemizu , Kazumasa Takata , Masaru Fujita
IPC: F21V8/00
CPC classification number: G02B6/0046 , G02B6/0038
Abstract: Light control body (6) has first incident surface (7) and first reflection surface (9). First incident surface (7) condenses part of light emitted from light source (1) and emits the light toward incident surface (3) of light guide plate (2). First reflection surface (9) reflects the light that is emitted from light source (1) and does not pass through first incident surface (7), and emits the light toward incident surface (3) of light guide plate (2). First focal position (11) of first incident surface (7) and second focal position (12) of first reflection surface (9) are set at positions that are different from each other and away from the light emission surface of light source (1).
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公开(公告)号：US20180267227A1
公开(公告)日：2018-09-20
申请号：US15890942
申请日：2018-02-07
Inventor： Kazumasa Takata , Wahei Agemizu , Kenji Takamoto
IPC: F21V8/00
CPC classification number: G02B6/0036 , G02B6/003 , G02B6/0055 , G02B6/006 , G02B6/0068
Abstract: A display apparatus includes: a light guide plate; a light source that causes light to be incident on an end surface of the light guide plate; a hiding plate that is provided on a side of an emission surface of the light guide plate, and that includes a light transmission part which transmits light emitted from the emission surface and a light shielding part which has lower light transmittance than the light transmission part; and a colored board that has light reflectance closer to light reflectance of the light shielding part than light reflectance of the light transmission part in each wavelength, and that is provided on a side of a reflection surface of the light guide plate so as to overlap the light transmission part of the hiding plate when viewed from a direction perpendicular to the emission surface of the light guide plate.
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公开(公告)号：US11656473B2
公开(公告)日：2023-05-23
申请号：US17235088
申请日：2021-04-20
Inventor： Kazumasa Takata , Masaru Fujita , Wahei Agemizu , Yosuke Araki , Tomohisa Sakaguchi
CPC classification number: G02B27/0972 , B60K37/02 , G02B27/0101 , B60K2370/1529 , B60K2370/347
Abstract: An optical system includes a light guide member having a light-incident surface, a first surface, a light-emitting surface facing the first surface, a first end surface, a second end surface, a plurality of collimating lenses disposed on the light-incident surface and being arranged along a first direction, and a plurality of prism pieces. The plurality of prism pieces include two or more prism pieces having different inclination angles with respect to the light-incident surface depending on positions of the prism pieces in at least the first direction, and each of the inclination angles of the two or more prism pieces is an angle formed between the first direction and the longitudinal axis of a corresponding prism piece. Each of the inclination angles of the two or more prism pieces increases as the corresponding prism piece is positioned closer to any of the first end surface or the second end surface.
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公开(公告)号：US11422452B2
公开(公告)日：2022-08-23
申请号：US17016556
申请日：2020-09-10
Inventor： Kazumasa Takata , Takashi Matsuda , Atsushi Fukui
Abstract: An optical multiplexer includes: an incident surface on which incident light beams having different wavelengths are to be incident; a reflection portion configured to reflect the incident light beams; and an emission surface configured to emit reflected light beams reflected by the reflection portion. The incident surface has adjacent condenser lenses corresponding to the respective incident light beams. The reflection portion has adjacent reflection surfaces configured to reflect the respective incident light beams which have been condensed. The adjacent reflection surfaces are respectively disposed so that angle β formed by the respective reflected light beams reflected by the adjacent reflection surfaces is smaller than angle α formed by the respective incident light beams which have been condensed. The emission surface has diffraction grating in which the respective reflected light beams reflected by the adjacent reflection surfaces are to be incident at a same position and diffracted in a same direction.
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公开(公告)号：US11098868B2
公开(公告)日：2021-08-24
申请号：US16997043
申请日：2020-08-19
Inventor： Tomohisa Sakaguchi , Yosuke Araki , Kazumasa Takata
IPC: F21S41/275 , F21V5/00 , F21S41/143 , F21S41/30 , F21Y115/10 , F21W102/135
Abstract: A lighting device includes light emitting element; first lens that receives light emitted from light emitting element and emits first emission light; and second lens that receives the first emission light and emits second emission light. Second lens includes second convex incident surface receiving the first emission light, second convex emission surface that is provided on a right side of a drawing and emits the second emission light, and second top surface portion and second bottom surface portion each located between second incident surface and second emission surface. Second bottom surface portion includes first inclined surface and second inclined surface formed to be inclined with respect to an optical axis of light emitting element.
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Patent Agency Ranking
公开(公告)号：US10025022B2
公开(公告)日：2018-07-17
申请号：US15227592
申请日：2016-08-03
Inventor： Kazumasa Takata
Abstract: A multicolor display device realizes multicolor display with high color reproducibility which can be felt beautiful. A red light, a green light and a blue light are incident on a light guide body on which a picture pattern is formed from light sources as first light sources, and a white light is incident thereon from a light source as a second light source to display the picture pattern in multi-colors, thereby realizing beautiful display with good reproducibility of a white color.
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公开(公告)号：US11054101B2
公开(公告)日：2021-07-06
申请号：US16998779
申请日：2020-08-20
Inventor： Yosuke Araki , Ryoma Murase , Kazumasa Takata , Jun Hirai , Hiroshi Umiji , Hiroshi Hamano
IPC: F21S41/25 , F21V5/00 , F21V3/02 , F21S41/30 , F21S41/143 , F21W102/135 , F21Y115/10
Abstract: A lighting device includes a light emitting element; a first lens that receives light emitted from the light emitting element and emits first emission light; and a second lens that receives the first emission light and emits second emission light. The first lens has a first emission surface emitting the first emission light, the first emission surface having a convex shape protruding in a Z direction.
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公开(公告)号：US10527776B2
公开(公告)日：2020-01-07
申请号：US16183776
申请日：2018-11-08
Inventor： Kazumasa Takata , Wahei Agemizu
IPC: F21V8/00
Abstract: A display device includes a light guide plate, a first light source, a second light source, and a light transmitting portion. The light guide plate includes a first reflecting prism and a second reflecting prism. The first reflecting prism has an inclined surface that reflects the light incident from the first side surface toward the main surface. The second reflecting prism has an inclined surface that reflects the light incident from the second side surface toward the main surface. The longitudinal direction of the inclined surface of the first reflecting prism is parallel or substantially parallel to a line connecting the second light source and the inclined surface of the first reflecting prism.
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公开(公告)号：US10345503B2
公开(公告)日：2019-07-09
申请号：US15730703
申请日：2017-10-11
Inventor： Kazumasa Takata , Kenji Takamoto , Wahei Agemizu
Abstract: A display device includes a light guide plate, and light sources allowing light to be incident on a first side surface and a second side surface of the light guide plate. First incidental side surface light from the first light source is reflected to an upper surface side by first reflection parts formed on a bottom surface to display a first pattern, and second incidental side surface light from the second light source is reflected to the upper surface side by second reflection parts formed on the bottom surface to display a second pattern. Slopes are provided at parts of the first side surface and the second side surface of the light guide plate, and light reflected on a facing reflection surface and propagating in the light guide plate again is reduced by the slopes.
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公开(公告)号：US12204100B2
公开(公告)日：2025-01-21
申请号：US18375665
申请日：2023-10-02
Inventor： Wahei Agemizu , Kazumasa Takata , Masaru Fujita , Tomohisa Sakaguchi , Hiroki Hara , Masaki Amie
Abstract: An optical system includes a light guide member having an incident surface, a first surface and a light emergent surface; and at least one prism provided on the first surface and configured to reflect light received by the incident surface and travelling inside the light guide member, towards the light emergent surface. The light guide member provides an optical path along which the light that has entered through the incident surface is directly reflected from the prism and allowed to emerge from the light emergent surface. The light guide member also provides another optical path along which the light that has entered through the incident surface is once reflected from the second surface, reflected again from the prism, and then allowed to emerge from the light emergent surface. The optical system is configured to be coupled to a light source, to illuminate a display system which projects a virtual image onto a target space.
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