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    Systems, devices, and methods for aperture-free hologram recording
    2.
    发明授权
    Systems, devices, and methods for aperture-free hologram recording 有权

    公开(公告)号：US11409238B2

    公开(公告)日：2022-08-09

    申请号：US16204842

    申请日：2018-11-29

    Applicant: GOOGLE LLC

    Inventor： John Cormier

    IPC: G02B5/32 ,  G03H1/02 ,  G03H1/26 ,  G02B27/01 ,  G03H1/04 ,  G03H1/18

    Abstract: The apertures typically used for hologram recording create unwanted secondary holograms by diffracting light. Aperture-free hologram recording eliminates these unwanted secondary holograms. Aperture-free hologram recording includes applying a mask to the holographic recording medium. The mask controls the size of the recorded hologram like an aperture but does not create unwanted secondary holograms. Hologram fringes are only present in the desired recording area and a thin boundary region. The mask may be present during recording, or the mask may be used to pre-bleach the holographic recording medium. Pre-bleaching the holographic recording medium renders a portion of the holographic recording medium insensitive to light, the hologram is recorded in the light-sensitive portions of the holographic recording medium.

    Method of producing volume hologram laminate
    5.
    发明授权
    Method of producing volume hologram laminate 有权

    公开(公告)号：US10474099B2

    公开(公告)日：2019-11-12

    申请号：US15350528

    申请日：2016-11-14

    Applicant: DAI NIPPON PRINTING CO., LTD.

    Inventor： Minoru Azakami ,  Koji Eto ,  Hiroyuki Ohtaki ,  Yoshihito Maeno ,  Sakurako Hatori

    IPC: G03H1/02 ,  G03H1/18 ,  G03F7/00 ,  G03H1/00

    Abstract: A main object of the present invention is to provide a method of producing a volume hologram laminate which can regenerate a hologram image in an arbitrary wavelength by a simple process. To attain the object, the present invention provides a method of producing a volume hologram laminate using a volume hologram forming substrate which comprises: a substrate, a volume hologram layer formed on the substrate and containing a photopolymerizable material, a resin layer, formed on the substrate so as to contact to the volume hologram layer, containing a resin and a polymerizable compound, characterized in that the producing method comprises processes of: a hologram recording process to record a volume hologram to the volume hologram layer, a substance transit process of transiting the polymerizable compound to the volume hologram layer, and an after-treatment process of polymerizing the polymerizable compound.

    Printing diffraction gratings on paper and board
    6.
    发明授权
    Printing diffraction gratings on paper and board 有权

    公开(公告)号：US10322603B2

    公开(公告)日：2019-06-18

    申请号：US14578657

    申请日：2014-12-22

    Applicant: BASF SE

    Inventor： Michelle Richert ,  Thomas Bolle ,  Roland Fleury

    IPC: G03H1/04 ,  B41M7/00 ,  B41M3/14 ,  B42D25/23 ,  B42D25/24 ,  B42D25/328 ,  B42D25/324 ,  B42D25/30 ,  B42D25/378 ,  B42D25/405 ,  B42D25/21 ,  B42D25/373 ,  G03H1/02 ,  B42D25/42 ,  B42D25/425 ,  B42D25/29 ,  B05D3/06 ,  B41M3/06 ,  B41M1/24 ,  G03H1/18

    Abstract: A method and an apparatus for forming a surface relief microstructure, especially an optically variable image on a paper substrate are provided, the method comprising the steps of: A) applying a curable composition to at least a portion of the frontside of the paper substrate; B) contacting at least a portion of the curable composition with surface relief microstructure, especially optically variable image forming means; C) curing the composition by using at least one UV lamp (1, 2, 3) which is arranged on the backside of the paper substrate; D) optionally depositing a layer of a transparent high refractive index material and/or a metallic layer on at least a portion of the cured composition, wherein the lamp (1, 2, 3) having emission peak(s) in the UV-A and near VIS range and the curable composition comprises at least a photoinitiator which absorbs in the UV-A region and preferably in the near VIS range. A paper product obtainable uses the method and an apparatus for forming a surface relief microstructure on a paper substrate. Surface relief microstructures, such as holograms may be replicated rapidly and with accuracy on a paper substrate by using the method and the apparatus.

    Color image display devices comprising structural color pixels that are selectively activated and/or deactivated by material deposition
    7.
    发明授权
    Color image display devices comprising structural color pixels that are selectively activated and/or deactivated by material deposition 有权

    公开(公告)号：US10281626B2

    公开(公告)日：2019-05-07

    申请号：US15217587

    申请日：2016-07-22

    Applicant: Nanomedia Solutions Inc.

    Inventor： Hao Jiang ,  Bozena Kaminska

    IPC: G02B5/00 ,  G02B5/18 ,  G02B5/20 ,  G03H1/02 ,  G03H1/18 ,  G06K19/06

    Abstract: A color image display device comprising arrays of structural color pixels, where said structural color pixels may be formed on a single substrate layer or multiple substrate layers and are patterned by selective material deposition to display a color image in accordance with input color images or patterns. The structural color pixels comprise a plurality of microstructures and/or nanostructures, including without limitation, diffraction gratings, sub-wavelength structures, to display colors in red, green, blue in RGB color space or cyan, magenta, yellow in CMY color space. Examples include methods of activating and/or deactivating structural pixels using selective material deposition onto at least one layer of the color display device to form a color image. Further examples include product labels, authentication devices and security documents carrying customized or personalized information and methods for their manufacture.

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