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公开(公告)号：US20240369743A1
公开(公告)日：2024-11-07
申请号：US18773316
申请日：2024-07-15
Applicant: FUJIFILM Corporation
Inventor： Hiroshi SATO , Yukito SAITOH , Katsumi SASATA
Abstract: Provided are an optical element, including a plurality of optically anisotropic layers, each of which has an in-plane alignment pattern in which orientations of optical axes derived from a liquid crystal compound change continuously and rotationally along at least one in-plane direction, in a thickness direction, in which the optically anisotropic layers each have regions where lengths over which the orientations of the optical axes rotate by 180° in the one direction are different from each other, and at least one of the plurality of optically anisotropic layers is an inclined optically anisotropic layer having a region where a plurality of pairs of bright lines and dark lines in a cross-sectional image are present and the pairs of the bright lines and the dark lines are inclined at inclination angles which are different from each other with respect to a normal line of an interface of the optically anisotropic layer.
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公开(公告)号：US20240280829A1
公开(公告)日：2024-08-22
申请号：US18648554
申请日：2024-04-29
Applicant: FUJIFILM Corporation
Inventor： Masaaki SUZUKI , Hiroshi SATO
CPC classification number: G02B27/4205 , G02B5/3016
Abstract: Provided are an optical element having a high diffraction efficiency of transmitted light and an image display apparatus formed of the optical element. The optical element includes at least: a first optically-anisotropic layer that is formed of a liquid crystal composition including a liquid crystal compound; and a second optically-anisotropic layer that is formed of a liquid crystal composition including a liquid crystal compound, in which the first optically-anisotropic layer and the second optically-anisotropic layer have a liquid crystal alignment pattern in which an orientation of an optical axis derived from the liquid crystal compound changes while continuously rotating in at least one in-plane direction, a birefringence Δn1 of the first optically-anisotropic layer and a birefringence Δn2 of the second optically-anisotropic layer satisfy a relationship of Expression (1), a thickness T1 of the first optically-anisotropic layer and a thickness T2 of the second optically-anisotropic layer satisfy a relationship of Expression (2), and transmitted light is diffracted.
Δ
n
1
>
Δ
n
2
Expression
(
1
)
0.002
≤
T
2
/
T
1
≤
0.3
Expression
(
2
)-
公开(公告)号：US20240134098A1
公开(公告)日：2024-04-25
申请号：US18541062
申请日：2023-12-15
Applicant: FUJIFILM Corporation
Inventor： Yukito SAITOH , Hiroshi SATO , Takashi YONEMOTO
IPC: G02B5/18
CPC classification number: G02B5/1866
Abstract: Provided is a transmissive liquid crystal diffraction element that can diffract different polarized light components in the same direction and has high diffraction efficiency with respect to unpolarized light. The transmissive liquid crystal diffraction element includes first to fourth optically-anisotropic layers each of which has a liquid crystal alignment pattern in which a direction of an optical axis changes while continuously rotating in at least one in-plane direction, in which the optical axis in each of the first to the fourth optically-anisotropic layers is twisted in a thickness direction, rotation directions of the optical axes in the liquid crystal alignment patterns and twisted directions of the optical axes in the thickness direction are opposite to each other in the first optically-anisotropic layer and the second optically-anisotropic layer, rotation directions of the optical axes in the liquid crystal alignment patterns and twisted directions of the optical axes in the thickness direction are opposite to each other in the third optically-anisotropic layer and the fourth optically-anisotropic layer, single periods of the liquid crystal alignment patterns are the same in the first optically-anisotropic layer and the second optically-anisotropic layer, single periods of the liquid crystal alignment patterns are the same in the third optically-anisotropic layer and the fourth optically-anisotropic layer, and the single periods of the liquid crystal alignment patterns are different in the first optically-anisotropic layer and the third optically-anisotropic layer.
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24.发明公开公开(公告)号：US20230229038A1
公开(公告)日：2023-07-20
申请号：US18176529
申请日：2023-03-01
Applicant: FUJIFILM Corporation
Inventor： Hiroshi SATO , Yukito SAITOH , Takashi YONEMOTO , Makoto ISHIGURO
IPC: G02F1/1335 , G02F1/1337
CPC classification number: G02F1/133504 , G02F1/133761 , G02F1/133541 , G02B5/3083
Abstract: Provided are a liquid crystal diffraction element having a high diffraction efficiency irrespective of diffraction angles, an optical element including the liquid crystal diffraction element, and an image display unit, a head-mounted display, a beam steering, and a sensor including the liquid crystal diffraction element or the optical element. The liquid crystal diffraction element includes: an optically-anisotropic layer that is formed of a liquid crystal composition including a liquid crystal compound, 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, in a case where a length over which the direction of the optical axis derived from the liquid crystal compound rotates by 180° in a plane is set as a single period, a length of the single period in the liquid crystal alignment pattern gradually changes in the one in-plane direction, in a cross-sectional image of the optically-anisotropic layer obtained by observing a cross-section taken in a thickness direction parallel to the one in-plane direction with a scanning electron microscope, the optically-anisotropic layer has bright portions and dark portions extending from one surface to another surface and each of the dark portions has two or more inflection points of angle, the optically-anisotropic layer has regions where tilt directions of the dark portions are different from each other in the thickness direction, and an average tilt angle of the dark portion gradually changes in the one in-plane direction.
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公开(公告)号：US20230204968A1
公开(公告)日：2023-06-29
申请号：US18172807
申请日：2023-02-22
Applicant: FUJIFILM Corporation
Inventor： Hiroshi SATO , Yukito Saitoh , Takashi Yonemoto
CPC classification number: G02B27/281 , G02B27/4205 , G02B5/3016 , G06F1/163 , G02B5/3083
Abstract: Provided are an image display unit and a head-mounted display where the size is small, the light utilization efficiency is high, and a decrease in image quality is small. The image display unit includes: an image display apparatus; a polarization diffraction element that diffracts light emitted from the image display apparatus; and a polarizing plate that allows transmission of the polarized light diffracted by the polarization diffraction element and absorbs light not diffracted by the polarization diffraction element, in which the polarization diffraction element is a polarization diffraction lens having a lens function, and in a case where a focal length of the polarization diffraction lens is represented by f and a distance between the image display apparatus and the polarization diffraction lens is represented by d, d≤f is satisfied.
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Patent Agency Ranking
公开(公告)号：US20230194948A1
公开(公告)日：2023-06-22
申请号：US18173633
申请日：2023-02-23
Applicant: FUJIFILM Corporation
Inventor： Yukito SAITOH , Hiroshi SATO
IPC: G02F1/29 , G02F1/1337 , G02F1/1335
CPC classification number: G02F1/29 , G02F1/133757 , G02F1/133504
Abstract: An object of the present invention is to provide a light deflection device having a simple structure suitable for reducing the size and weight where a deflection angle can be increased. The object can be achieved with a light deflection device including: a light deflection element that deflects incident light in one direct to be emitted; a driving unit that drives the light deflection element; and a diffraction element that is disposed on a light emission side of the light deflection element in which a periodic structure pitch gradually changes from a center of deflection from the light deflection element toward an outside.
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公开(公告)号：US20230097214A1
公开(公告)日：2023-03-30
申请号：US18056536
申请日：2022-11-17
Applicant: FUJIFILM Corporation
Inventor： Yukito SAITOH , Hiroshi SATO , Takashi YONEMOTO , Jun WATANABE , Mitsuyoshi ICHIHASHI , Keisuke KODAMA
IPC: G02B5/30
Abstract: A transmissive liquid crystal diffraction element includes a first optically-anisotropic layer and a second optically-anisotropic layer each of which has a liquid crystal alignment pattern in which a direction of an optical axis derived from a liquid crystal compound changes while continuously rotating in at least one in-plane direction, in which a rotation direction of the optical axis in the liquid crystal alignment pattern of the first optically-anisotropic layer and a rotation direction of the optical axis in the liquid crystal alignment pattern of the second optically-anisotropic layer are opposite to each other, and a single period of the liquid crystal alignment pattern in the first optically-anisotropic layer and a single period of the liquid crystal alignment pattern in the second optically-anisotropic layer are the same.
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公开(公告)号：US20220390680A1
公开(公告)日：2022-12-08
申请号：US17886540
申请日：2022-08-12
Applicant: FUJIFILM Corporation
Inventor： Yukito SAITOH , Katsumi SASATA , Hiroshi SATO
Abstract: Provided is an optical communication device, such as a wavelength locker, a wavelength demultiplexer, an optical coupling system, and an optical switching system, using a small-sized lens element. An optical communication device includes, as a lens element, a liquid crystal diffractive lens element having an optically anisotropic layer that is formed using a composition containing a liquid crystal compound, and has a liquid crystal alignment pattern in which an orientation of an optical axis of the liquid crystal compound changes while continuously rotating toward one direction, in a radial shape from an inside toward an outside, and in the liquid crystal alignment pattern, in a case where a length over which the orientation of the optical axis rotates by 180° in one direction in which the optical axis changes is a single period, a length of the single period gradually decreases from the inside toward the outside.
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公开(公告)号：US20220373809A1
公开(公告)日：2022-11-24
申请号：US17849181
申请日：2022-06-24
Applicant: FUJIFILM Corporation
Inventor： Hiroshi SATO , Katsumi SASATA , Yukito SAITOH
IPC: G02B27/01 , G02F1/1337 , G02F1/1335
Abstract: Provided are: an image display apparatus that can display augmented reality in a virtual image is superimposed on a bright real scene; and AR glasses including the image display apparatus. The image display apparatus includes: a display element; and a reflective polarization diffraction element that reflects an image displayed by the display element, in which the polarization diffraction element has a region where a period of a diffraction structure decreases in a direction away from the display element.
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公开(公告)号：US20220333987A1
公开(公告)日：2022-10-20
申请号：US17849286
申请日：2022-06-24
Applicant: FUJIFILM Corporation
Inventor： Hiroshi SATO , Yukito SAITOH
Abstract: Provided are a hyperspectral sensor and a hyperspectral camera in which influence of external information such as a reflecting material is reduced such that the spectral data accuracy of a subject to be acquired can be improved. In the hyperspectral sensor in which light from a subject is split into light components in a plurality of wavelength ranges by a spectral optical element and each of the light components in the wavelength ranges is received by a sensor array consisting of a plurality of photodetection elements to acquire spectral data in which spectral information of the subject is associated with each of the photodetection elements, a polarization diffraction element that emits polarized light is used as the spectral optical element.
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