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公开(公告)号：US20240272362A1
公开(公告)日：2024-08-15
申请号：US18633938
申请日：2024-04-12
Applicant: FUJIFILM Corporation
Inventor： Yukito SAITOH , Makoto KAMO , Megumi SEKIGUCHI , Yujiro YANAI
IPC: G02B6/27
CPC classification number: G02B6/2713
Abstract: An object is to provide an optical coupling system having a simplified structure and a small size and an optical communication device using the optical coupling system. The object is achieved by an optical coupling system that couples a multi-core fiber and coupled devices to each other using a combination of a polarized light beam control element facing a light incident and emission surface of a multi-core fiber and a polarization-selective diffraction element that is positioned on a side of the polarized light beam control element opposite to the emission surface of the multi-core fiber and that faces the coupled devices.
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公开(公告)号：US20240159589A1
公开(公告)日：2024-05-16
申请号：US18402286
申请日：2024-01-02
Applicant: FUJIFILM Corporation
Inventor： Yukito SAITOH , Yujiro YANAI , Hiroshi SATO , Takashi YONEMOTO
IPC: G01J3/18
CPC classification number: G01J3/18
Abstract: Provided is a spectroscope excellent in measurement efficiency. A spectroscope that separates incident light to be measured including a spectroscopic unit that reflects and separates incident light and a detection unit that detects light reflected from the spectroscopic unit, in which the spectroscopic unit includes a first cholesteric liquid crystal layer obtained by fixing a cholesteric liquid crystalline phase and a second cholesteric liquid crystal layer obtained by fixing a cholesteric liquid crystalline phase, the first cholesteric liquid crystal layer and the second cholesteric liquid crystal layer have a liquid crystal alignment pattern in which an orientation of an optical axis derived from a liquid crystal compound changes while continuously rotating in at least one in-plane direction, a rotation direction of the optical axis in the liquid crystal alignment pattern of the first cholesteric liquid crystal layer is opposite to a rotation direction of the optical axis in the liquid crystal alignment pattern of the second cholesteric liquid crystal layer, and a twisted direction of the liquid crystal compound in a thickness direction of the first cholesteric liquid crystal layer is opposite to a twisted direction of the liquid crystal compound in a thickness direction of the second cholesteric liquid crystal layer.
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83.发明公开公开(公告)号：US20240094579A1
公开(公告)日：2024-03-21
申请号：US18492603
申请日：2023-10-23
Applicant: FUJIFILM Corporation
Inventor： Fumitake MITOBE , Katsumi SASATA , Yukito SAITOH , Akiko WATANO
IPC: G02F1/1335 , G02F1/137
CPC classification number: G02F1/133524 , G02F1/133504 , G02F1/13718 , G02B27/0172
Abstract: A light guide element includes: a light guide plate; and a diffraction element that is disposed on a main surface of the light guide plate, in which the diffraction element includes a liquid crystal layer that is formed of a liquid crystal composition including a liquid crystal compound and has a liquid crystal alignment pattern in which a direction of an optical axis derived from the liquid crystal compound changes while continuously rotating in at least one in-plane direction, a refractive index of the light guide plate is 1.70 or higher, and in a case where the refractive index of the light guide plate is represented by nd and a refractive index of the liquid crystal layer is represented by nk, nk−nd≥0 is satisfied.
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公开(公告)号：US20240077664A1
公开(公告)日：2024-03-07
申请号：US18493881
申请日：2023-10-25
Applicant: FUJIFILM Corporation
Inventor： Hiroshi SATO , Katsumi SASATA , Yukito SAITOH
IPC: G02B5/30 , G01S7/481 , G02B5/28 , G02F1/1335
CPC classification number: G02B5/3016 , G01S7/481 , G02B5/283 , G02B5/305 , G02F1/133543 , G02F2201/343
Abstract: Provided is a sensor having a high SN ratio. The sensor includes a light source, a band pass filter, and a light-receiving element, in which the band pass filter includes two cholesteric liquid crystal layers and a discontinuous layer disposed between the two cholesteric liquid crystal layers, in the two cholesteric liquid crystal layers, helical twisted directions and helical pitches are the same, and in a case where the discontinuous layer is a layer other than a cholesteric liquid crystal layer and a wavelength having a lowest reflectivity in a selective reflection wavelength range of the band pass filter is represented by λm [nm], a thickness [nm] is in a range of “30×(λm/550) to 150×(λm/550)”.
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公开(公告)号：US20230400694A1
公开(公告)日：2023-12-14
申请号：US18453152
申请日：2023-08-21
Applicant: FUJIFILM Corporation
Inventor： Naoyoshi YAMADA , Hirofumi TOYAMA , Yukito SAITOH
CPC classification number: G02B27/0172 , G06F3/013 , G02B5/3016 , G02B27/283 , G02B27/0093 , G02B2027/0123
Abstract: Provided is a virtual image display device where a scenery and a video can be displayed to be superimposed on each other and a field of view is wide. The virtual image display device includes: a transparent display; and an optical system that is disposed on a visible side with respect to the transparent display, in which the optical system includes a half mirror and a reflective polarizer, and at least one of the half mirror or the reflective polarizer has an action of a concave mirror.
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Patent Agency Ranking
公开(公告)号：US20230288719A1
公开(公告)日：2023-09-14
申请号：US18065044
申请日：2022-12-13
Applicant: FUJIFILM Corporation
Inventor： Fumitake MITOBE , Katsumi SASATA , Hiroshi SATO , Akiko WATANO , Yukito SAITOH
CPC classification number: G02B27/4272 , G02B6/0016 , G02B27/0172 , G02B2027/0178
Abstract: An optical element includes a light guide plate, an incidence portion, and an emission portion, in which the incidence/emission portion includes an Λ1 diffraction element having a diffraction period Λ1, an Λ2 diffraction element having a diffraction period Λ2, and an Λ3 diffraction element having a diffraction period Λ3, “Λ1:Λ2:Λ3 = 1: 1/√2± 0.015: ½ ± 0.015” is satisfied, an angle between periodic directions of the Λ1 diffraction element and the Λ2 diffraction element and an angle between periodic directions of the Λ2 diffraction element and the Λ3 diffraction element is 45° or 135° (± 0.5°), and an angle between the periodic directions of the Λ2 diffraction elements in the incidence portion and the emission portion is any one of 0°, 90°, 180°, or 270° (± 0.5°).
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公开(公告)号：US20230244012A1
公开(公告)日：2023-08-03
申请号：US18192498
申请日：2023-03-29
Applicant: FUJIFILM Corporation
Inventor： Takashi YONEMOTO , Yukito SAITOH , Hiroshi SATO
CPC classification number: G02B5/1833 , G02B5/3016
Abstract: Provided is a transmissive liquid crystal diffraction element having a large diffraction angle and a high diffraction efficiency. The transmissive liquid crystal diffraction element includes a plurality of optically-anisotropic layers that are formed of a liquid crystal composition including a liquid crystal compound in a thickness direction, in which the optically-anisotropic layer has a liquid crystal alignment pattern in which a direction of an optical axis derived from the liquid crystal compound changes while continuously rotating in at least one in-plane direction, the one in-plane directions of the plurality of optically-anisotropic layers are parallel to each other, in two optically-anisotropic layers adjacent to each other among the plurality of optically-anisotropic layers, a rotation direction of the optical axis in the liquid crystal alignment pattern of one optically-anisotropic layer and a rotation direction of the optical axis in the liquid crystal alignment pattern of the other optically-anisotropic layer are opposite to each other, in cross-sectional images of the plurality of optically-anisotropic layers obtained by observing cross-sections taken in a thickness direction parallel to the one in-plane direction with a scanning electron microscope, the plurality of optically-anisotropic layers have bright portions and dark portions extending from one surface to another surface, and tilt angles of the dark portions of the plurality of optically-anisotropic layers change in order in the thickness direction.
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公开(公告)号：US20230236353A1
公开(公告)日：2023-07-27
申请号：US18192119
申请日：2023-03-29
Applicant: FUJIFILM Corporation
Inventor： Akiko WATANO , Ryuji SANETO , Katsumi SASATA , Fumitake MITOBE , Hiroshi SATO , Yukito SAITOH
CPC classification number: G02B6/0056 , G02B6/005 , G02B6/0026 , G02B27/0172 , G02B2027/0178 , G02B2027/0147
Abstract: Provided is an optical element that can display a clear image having no blurriness in AR glasses or the like. The optical element includes: a substrate; and a laminate that is provided on the substrate and where a plurality of liquid crystal layers obtained by aligning a liquid crystal compound are laminated, in which the liquid crystal layers have a liquid crystal alignment pattern in which a direction of an optical axis derived from the liquid crystal compound changes while continuously rotating in at least one in-plane direction, and in at least one of the liquid crystal layers, an arithmetic mean value of differences between maximum film thicknesses and minimum film thicknesses obtained by observing 10 cross-sections with a scanning electron microscope is 0.1 μm or less.
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公开(公告)号：US20230168538A1
公开(公告)日：2023-06-01
申请号：US18159824
申请日：2023-01-26
Applicant: FUJIFILM Corporation
Inventor： Yukito SAITOH , Akiko WATANO , Fumitake MITOBE , Hiroshi SATO , Katsumi SASATA
IPC: G02F1/1335
CPC classification number: G02F1/133543 , G02F1/133524 , G02F1/133536
Abstract: An optical element comprising: a cholesteric liquid crystal layer obtained by cholesteric alignment of a liquid crystal compound, in which the cholesteric liquid crystal layer has a liquid crystal alignment pattern in which a direction of an optical axis derived from the liquid crystal compound changes while continuously rotating in at least one in-plane direction, a helical pitch of a helical axis direction in the cholesteric alignment gradually changes in a thickness direction of the cholesteric liquid crystal layer, and the cholesteric liquid crystal layer has a peak of reflection at each of a first wavelength λ and a second wavelength λ/2.
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公开(公告)号：US20230161200A1
公开(公告)日：2023-05-25
申请号：US18158354
申请日：2023-01-23
Applicant: FUJIFILM Corporation
Inventor： Yukito SAITOH , Hiroshi SATO , Takashi YONEMOTO
IPC: G02F1/1337 , G02F1/00 , G02F1/1335 , G02F1/13363
CPC classification number: G02F1/133757 , G02F1/0045 , G02F1/0063 , G02F1/133504 , G02F1/133631 , G02F2202/40 , G02F2203/22 , G02F2413/08
Abstract: A transmissive liquid crystal diffraction element includes a rod-like liquid crystal layer where a rod-like liquid crystal compound is aligned and a disk-like liquid crystal layer where a disk-like liquid crystal compound is aligned that are alternately laminated, in which each of the liquid crystal layers has a predetermined liquid crystal alignment pattern, rotation directions of optical axes in the liquid crystal alignment patterns are the same, single periods of the liquid crystal alignment patterns are the same, a thickness direction retardation |Rth| of each of the liquid crystal layers is 65 nm or less, and at an interface between the liquid crystal layers, longitudinal directions of the liquid crystal compounds match with each other.
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