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    Optical sensor systems
    53.
    发明授权
    Optical sensor systems 有权

    公开(公告)号：US11354880B2

    公开(公告)日：2022-06-07

    申请号：US16758769

    申请日：2018-10-25

    Applicant: 3M INNOVATIVE PROPERTIES COMPANY

    Inventor： Jonah Shaver ,  Susannah C. Clear ,  John A. Wheatley ,  Kui Chen-Ho

    IPC: G06V10/147 ,  H04B10/116 ,  H04B10/61

    Abstract: Systems, assemblies, and methods for detecting changes in polarization states are described. Example systems may include a light receiving unit including a sensor and a receiving polarizer. The sensor is configured to sense light from a polarized light source deflected through the receiving polarizer by a light directing article. The sensor is configured to generate a signal indicative a received polarization state of light deflected by the light directing articles. Such systems may be coupled to vehicles and may be useful for sensor-detectable signs, indicia, and markings to facilitate automated or assisted vehicular transport.

    RETROREFLECTIVE ARTICLE INCLUDING A CONFORMAL WAVELENGTH-SELECTIVE RADIATION ABSORBING COATING LAYER, AND METHODS OF MAKING SAME
    57.
    发明申请
    RETROREFLECTIVE ARTICLE INCLUDING A CONFORMAL WAVELENGTH-SELECTIVE RADIATION ABSORBING COATING LAYER, AND METHODS OF MAKING SAME 有权

    公开(公告)号：US20210364678A1

    公开(公告)日：2021-11-25

    申请号：US16963268

    申请日：2019-03-26

    Applicant: 3M INNOVATIVE PROPERTIES COMPANY

    Inventor： Daniel J. Schmidt ,  Reema Chatterjee ,  Kui Chen-Ho ,  Benjamin R. Coonce

    IPC: G02B5/124 ,  G02B5/22

    Abstract: The present disclosure provides a retroreflective article. The retroreflective article includes a retroreflective layer including a number of cube corner elements that collectively form a structured surface that is opposite a major surface, and a conformal wavelength-selective radiation absorbing coating layer adjacent to the structured surface. The present disclosure also provides a method of making a retroreflective article. The method includes obtaining a retroreflective layer, and forming a conformal wavelength-selective radiation absorbing coating layer on the retroreflective layer by applying a first material having a first binding group to the structured surface, and applying a second material having a second binding group to the first material. The conformal wavelength-selective radiation absorbing coating layer absorbs radiation of at least one selected wavelength and can impart color (or absorption of at least one wavelength outside of the colored wavelength range) to retroreflective light of the retroreflective article.

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