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    Reflective sheet, decorative sheet, and method of manufacturing reflective sheet
    1.
    发明授权
    Reflective sheet, decorative sheet, and method of manufacturing reflective sheet 有权

    公开(公告)号：US10852459B2

    公开(公告)日：2020-12-01

    申请号：US16836364

    申请日：2020-03-31

    申请人： FUJIFILM Corporation

    发明人： Makoto Ishiguro ,  Nobuhiko Ichihara ,  Michio Nagai

    IPC分类号： G02B5/02 ,  B29D11/00 ,  G02B5/20 ,  B29K105/00

    摘要： Provided are a reflective sheet having selective reflection in a wide wavelength range and a small change in tint depending on angles at which light is visually recognized, a decorative sheet, and a method of manufacturing a reflective sheet, the reflective sheet including a pitch gradient layer in which a helical pitch changes in a thickness direction of the layer. The reflective sheet includes at least one cholesteric liquid crystal layer having wavelength selective reflection properties, in which at least one of the cholesteric liquid crystal layers is a pitch gradient layer in which a helical pitch changes in a thickness direction, a half-width of an integral reflection spectrum of the reflective sheet is 100 nm or longer, and in a case where a wavelength on a short wavelength side that defines the half-width is represented by λα, a wavelength on a long wavelength side that defines the half-width is represented by λβ, a center wavelength that defines the half-width is represented by λC, λ1=(λα+λC/2, and λ2=(λC+λβ)/2, the following Expressions (1) and (2) are satisfied. I−R(λ1)>I−R(λ2)   Expression (1) SCE(λ1)/I−R(λ1)>SCE(λ2)/I−R(λ2)   Expression (2)

    DECORATIVE SHEET, OPTICAL DEVICE, AND IMAGE DISPLAY DEVICE
    2.
    发明申请
    DECORATIVE SHEET, OPTICAL DEVICE, AND IMAGE DISPLAY DEVICE 审中-公开

    公开(公告)号：US20200073173A1

    公开(公告)日：2020-03-05

    申请号：US16678202

    申请日：2019-11-08

    申请人： FUJIFILM Corporation

    发明人： Makoto Ishiguro ,  Nobuhiko Ichihara ,  Michio Nagai

    IPC分类号： G02F1/1335 ,  G02B5/30 ,  B32B7/023

    摘要： Provided are a decorative sheet for making the element using external light, for example, a camera or a sensor inconspicuous to an observer and an optical device and an image display device that include the above-described decorative sheet. The decorative sheet including a circularly polarized light reflecting layer, a λ/4 plate A, a linear polarizer, and a λ/4 plate B in this order, in which the circularly polarized light reflecting layer includes one or more cholesteric liquid crystal layers having wavelength selective reflecting properties, in a case where an integral reflectivity at a wavelength λ nm is represented by I-R(λ), I-R(630), I-R(550), and I-R(450) of the circularly polarized light reflecting layer are 30% or higher, and an angle between a slow axis of the λ/4 plate A and an absorption axis of the linear polarizer and an angle between a slow axis of the λ/4 plate B and the absorption axis of the linear polarizer are 45°±10°, respectively.

    Optical element
    3.
    发明授权
    Optical element 有权

    公开(公告)号：US12038662B2

    公开(公告)日：2024-07-16

    申请号：US17701033

    申请日：2022-03-22

    申请人： FUJIFILM Corporation

    发明人： Nobuhiko Ichihara ,  Hirofumi Toyama

    IPC分类号： G02F1/137 ,  G02F1/1337

    CPC分类号： G02F1/13718 ,  G02F1/133711

    摘要： Provided is a new optical element that can be used for various applications. The optical element includes: a liquid crystal layer where a liquid crystal compound is aligned; and a polymer layer that is laminated on the liquid crystal layer, in which the optical element is reversibly switchable between a reference form and a first form where a film thickness distribution of the liquid crystal layer is less than that of the reference form.

    Optical member and image display device including optical member
    5.
    发明授权
    Optical member and image display device including optical member 有权

    公开(公告)号：US10222525B2

    公开(公告)日：2019-03-05

    申请号：US15496622

    申请日：2017-04-25

    申请人： FUJIFILM Corporation

    发明人： Michio Nagai ,  Yoji Ito ,  Daisuke Kashiwagi ,  Akira Yamamoto ,  Nobuhiko Ichihara ,  Hideyuki Nakamura

    IPC分类号： G06F3/03 ,  G02B5/26 ,  G02F1/13 ,  G06F3/042 ,  G06F3/0354

    摘要： The optical member of the present invention includes: a substrate; and a dot that is in contact with a surface of the substrate, in which the dot has wavelength selective reflecting properties, the dot is formed of a liquid crystal material having a cholesteric structure, the cholesteric structure has a stripe pattern including bright portions and dark portions in a cross-sectional view of the dot when observed with a scanning electron microscope, the dot includes a portion having a height which continuously increases to a maximum height in a direction moving from an end portion of the dot to the center of the dot, in the portion, an angle between a normal line perpendicular to a line, which is firmed using a first dark portion from a surface of the dot, and the surface is in a range of 70° to 90°, and the liquid crystal material includes a surfactant.

    Transparent screen
    7.
    发明授权
    Transparent screen 有权

    公开(公告)号：US10295897B2

    公开(公告)日：2019-05-21

    申请号：US15678498

    申请日：2017-08-16

    申请人： FUJIFILM Corporation

    发明人： Michio Nagai ,  Yoji Ito ,  Akira Yamamoto ,  Yukito Saitoh ,  Yujiro Yanai ,  Daisuke Kashiwagi ,  Nobuhiko Ichihara

    IPC分类号： G03B21/56 ,  G02B5/30 ,  G03B21/60 ,  G02B27/28 ,  G02B5/02 ,  G02B5/20 ,  G02B27/26 ,  G03B21/62

    摘要： A transparent screen includes a substrate capable of transmitting light; and a plurality of dots formed on a surface of the substrate, each of the dots having wavelength-selective reflectivity and being formed of a liquid crystal material having a cholesteric structure, in which the cholesteric structure gives a striped pattern of bright parts and dark parts in a cross-sectional view of the dot observed by scanning electron microscope, the dot includes a portion having a height that increases continuously to the maximum height in a direction extending from the edge toward the center of the dot, and in the portion, the angle formed by the normal line to a line that is formed by a first one of the dark parts as counted from the surface of the dot on the opposite side of the substrate and the surface of the dot is in the range of 70° to 90°.

    Transparent screen for 3D display and 3D display system
    8.
    发明授权
    Transparent screen for 3D display and 3D display system 有权

    公开(公告)号：US10254639B2

    公开(公告)日：2019-04-09

    申请号：US15841606

    申请日：2017-12-14

    申请人： FUJIFILM Corporation

    发明人： Nobuhiko Ichihara ,  Yujiro Yanai ,  Akira Yamamoto ,  Michio Nagai ,  Daisuke Kashiwagi ,  Yukito Saitoh

    IPC分类号： G03B21/604 ,  G02B5/26 ,  G03B35/26 ,  G02B5/09 ,  G02B5/24 ,  G02F1/1335 ,  G03B21/608 ,  G02B5/10 ,  G02B5/20 ,  G02B5/30 ,  G02B27/26 ,  G03B21/62

    摘要： A transparent screen for 3D display having excellent transparency and an excellent viewing angle, and a 3D display system are provided. The transparent screen for 3D display has a plurality of dots, each of the dots having wavelength selectivity and being formed of a liquid crystal material having a cholesteric structure, in which the cholesteric structure gives a striped pattern of bright parts and dark parts in a cross-sectional view of the dot observed by a scanning electron microscope, the dot includes a portion having a height that increases continuously to the maximum height in a direction extending from the edge toward the center of the dot, in the portion, the angle formed by the normal line to a line that is formed by a first dark part as counted from the surface of the dot on the opposite side of the substrate and the surface of the dot is in the range of 70° to 90°, and right-handed circularly polarized light and left-handed circularly polarized light are reflected by the plurality of dots.

    Optical member, optical element, liquid crystal display device, and near-to-eye optical member
    10.
    发明授权
    Optical member, optical element, liquid crystal display device, and near-to-eye optical member 有权

    公开(公告)号：US10386569B2

    公开(公告)日：2019-08-20

    申请号：US15672727

    申请日：2017-08-09

    申请人： FUJIFILM Corporation

    发明人： Yujiro Yanai ,  Yukito Saitoh ,  Akira Yamamoto ,  Nobuhiko Ichihara ,  Daisuke Kashiwagi ,  Michio Nagai

    IPC分类号： F21V8/00 ,  G02B5/02 ,  G02B5/30 ,  G02F1/137 ,  G02F1/1335 ,  G02F1/13357

    摘要： Provided is an optical member having a high brightness, a low haze, and a small color change, an optical element, a liquid crystal display device, and a near-to-eye optical member. The optical member includes a plurality of cholesteric liquid crystal dots that are provided on a substrate, in which a shape of each of the dots is a hemispherical or elliptical hemispherical shape in which the substrate side is planar, a conical or elliptical conical shape in which the substrate side is set as the bottom, or a shape in which a plurality of shapes selected from the shapes are laminated, the cholesteric liquid crystal dot has a reflection center wavelength with respect to visible light, the cholesteric structure of the dot has a stripe pattern including bright portions and dark portions in a cross-sectional view of the dot when observed with a scanning electron microscope, the dot includes a portion having a height which continuously increases to a maximum height in a direction moving from an end portion of the dot to the center of the dot, and in the portion, an angle between a normal line perpendicular to a line, which is formed using a first dark portion from a surface of the dot opposite to the substrate, and the surface of the dot is in a range of 70° to 90°.