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    • 6. 发明公开
    • METAMERIC SECURITY DEVICES USING AN ACTIVE MATERIAL
    • METAMERE SICHERHEITSVORRICHTUNGEN MIT EINEM WIRKSTOFF
    • EP2576234A1
    • 2013-04-10
    • EP11789032.7
    • 2011-06-03
    • Polyvalor, Limited Partnership
    • BALOUKAS, BillMARTINU, Ludvik
    • B42D15/10G02F1/15
    • B42D25/21B42D25/00B42D25/29B42D25/36B42D2035/24G02F1/15G02F1/1506
    • An integrated security structure is provided employing an external source of energy to change the appearance of the structure rendering the structure more challenging to duplicate due to its complexity. The security structure includes a substrate forming part of a bank note, identification document, or other security device; an active device within the substrate changing color between at least two colors wherein a color of the substrate surrounding the active device matches one of the at least two colors to form a metameric device. At least one Interference Security Image Structure (ISIS) is configured to be metameric with a bleached state of the active device and is therefore invisible at normal incidence. Another ISIS is metameric with the colored state of the electrochromic device and consequently becomes invisible during coloration. When the whole device is tilted, both ISIS's change color while the rest of the device essentially remains the same.
    • 提供了一种集成的安全结构,采用外部能源来改变结构的外观,使结构更具挑战性,由于其复杂性而复制。 安全结构包括形成纸币,识别文件或其他安全装置的一部分的基板; 衬底内的有源器件在至少两种颜色之间改变颜色,其中围绕有源器件的衬底的颜色与至少两种颜色之一匹配以形成同种异体器件。 至少一个干扰安全图像结构(ISIS)被配置为具有活动设备漂白状态的同色异体,因此在正常入射时不可见。 另一种ISIS是具有电致变色装置的着色状态的同色异体体,因此在着色期间变得不可见。 当整个设备倾斜时,ISIS的颜色变化,而设备的其余部分基本保持不变。