SECURING CREDENTIALS WITH OPTICAL SECURITY FEATURES FORMED BY QUASI-RANDOM OPTICAL CHARACTERISTICS OF CREDENTIAL SUBSTRATES

    公开(公告)号:US20180276364A1

    公开(公告)日:2018-09-27

    申请号:US15464684

    申请日:2017-03-21

    Inventor: Robert K. Rowe

    Abstract: Systems and methods are described for securing credentials with optical security features formed by quasi-random optical characteristics (QROCs) of credential substrates. A QROC can be a pattern of substrate element locations (SELs) on the substrate that includes some SELs that differ in optical response from surrounding SELs. During manufacturing, a QROC of a substrate can be characterized, hidden by a masking layer, and associated with a substrate identifier. During personalization, personalization data can be converted into an authentication graphic formed on the substrate by de-masking portions of the masking layer according to a de-masking pattern. The graphic formation can result in a representation that manifests a predetermined optical response only when the de-masking pattern is computed with knowledge of the hidden QROC. The authentication graphic and optical response can facilitate simple human authentication of the credential without complex or expensive detection equipment.

    Optically effective surface relief microstructures and method of making them
    10.
    发明授权
    Optically effective surface relief microstructures and method of making them 有权
    光学有效的表面浮雕微结构及其制作方法

    公开(公告)号:US08840146B2

    公开(公告)日:2014-09-23

    申请号:US12297126

    申请日:2007-05-07

    Applicant: Martin Stalder

    Inventor: Martin Stalder

    Abstract: The present invention relates to an element comprising a surface area with a specific, optically effective surface relief microstructure (12). The surface relief microstructure has a surface modulation of top regions (13) and bottom regions (14), wherein in a first lateral direction of the surface area there is in average at least one transition from a top to a bottom region or vice versa within every 20 micrometer, and in a second lateral direction of the mask, which is perpendicular to the first direction, there is in average at least one transition from a first to a second zone or vice versa within every 200 micrometer. In the microstructure, (i) in the first direction the lateral arrangement of the transitions is non-periodic, and (ii) the top regions substantially lie in the same top relief plateau (15) and the bottom regions substantially lie in the same bottom relief plateau (16).Through scattering effects, the surface relief microstructures are suitable to display images with a positive-negative image flip, which advantageously have a distinct and saturated color appearance but at the same time do not show any rainbow colors.The invention also relates to methods for making such elements as well as to security devices comprising such elements.

    Abstract translation: 本发明涉及包括具有特定光学有效的表面浮雕微结构(12)的表面区域的元件。 表面浮雕微结构具有顶部区域(13)和底部区域(14)的表面调制,其中在表面区域的第一横向方向上平均有至少一个从顶部到底部区域的转变,反之亦然。 每隔20微米,并且在垂直于第一方向的掩模的第二横向方向上,在每200微米内平均有至少一个从第一区到第二区的转变,反之亦然。 在微结构中,(i)在第一方向上,转变的横向布置是非周期性的,并且(ii)顶部区域基本上位于相同的顶部浮雕平台(15)中,并且底部区域基本上位于相同的底部 救济高原(16)。 通过散射效应,表面浮雕微结构适用于显示具有正 - 负图像翻转的图像,其有利地具有明显且饱和的色彩外观,但同时不显示任何彩虹色。 本发明还涉及用于制造这些元件的方法以及包括这些元件的安全装置。

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