Flake for covert security applications
    4.
    发明授权
    Flake for covert security applications 有权
    用于秘密安全应用的片

    公开(公告)号:US07258915B2

    公开(公告)日:2007-08-21

    申请号:US10641695

    申请日:2003-08-14

    IPC分类号: B32B5/16

    摘要: Covert flakes having one or more symbols and/or a selected shape are used in a composition, such as ink or paint, to provide a covert security feature to an object. In some embodiments the composition includes base pigment, and the covert flakes are covert pigment flakes that match the visual characteristics of the base pigment. In another embodiment, clear covert flakes are mixed in the carrier with base pigment. In another embodiment, clear covert flakes are mixed in a varnish base to provide a clear composition that can be applied over an existing security feature or elsewhere. The composition is used to print a field on the object, such as a stock certificate or bank note, for example. The covert flakes are not readily detectable by causal observation under visible light. In one embodiment, illuminating the covert security feature with ultraviolet light causes a covert flake to fluoresce and allows the observer to identify the location of the covert flake so that cover indicia may be observed. In a particular embodiment, a covert flake having one or more symbols is located using non-visible radiation, and then observed under visible light to read the symbol(s) on the covert flake.

    摘要翻译: 具有一个或多个符号和/或选定形状的隐蔽薄片用于诸如油墨或油漆的组合物中,以向对象提供隐蔽的安全特征。 在一些实施方案中,组合物包括基础颜料,并且隐形薄片是与基础颜料的视觉特性相匹配的隐蔽颜料薄片。 在另一个实施方案中,透明的薄片在载体中与基础颜料混合。 在另一个实施方案中,将透明的薄片混合在清漆基底中以提供可以在现有安全特征或其他地方施用的清楚的组合物。 组合物用于在对象上打印一个字段,例如股票证书或纸币。 通过在可见光下的因果观察,不易察觉到隐蔽的薄片。 在一个实施例中,用紫外光照射隐蔽安全特征将导致隐蔽的薄片发荧光,并允许观察者识别隐蔽薄片的位置,从而可以观察到覆盖标记。 在特定实施例中,使用不可见辐射定位具有一个或多个符号的隐形薄片,然后在可见光下观察以读取隐形薄片上的符号。

    All-dielectric optical diffractive pigments
    6.
    发明授权
    All-dielectric optical diffractive pigments 有权
    全介电光学衍射颜料

    公开(公告)号:US06815065B2

    公开(公告)日:2004-11-09

    申请号:US10365090

    申请日:2003-02-11

    IPC分类号: B32B516

    摘要: All-dielectric diffractive pigment flakes can be applied to an object to impart a diffractive effect to the object without substantially changing the background color of the object. In one case, such diffractive pigment flakes can be applied to a white object to impart a white diffractive effect. The thickness of the dielectric layers in the diffractive pigment flakes can be chosen to provide thin-film interference, as well as diffraction from the interfaces between layers patterned with a diffraction grating. In some cases, the thin-film interference can provide color shifting in addition to the diffractive effect.

    摘要翻译: 全介电衍射颜料薄片可以施加到物体上以赋予物体衍射效果,而基本上不改变物体的背景颜色。 在一种情况下,这种衍射颜料薄片可以施加到白色物体上以赋予白色衍射效果。 可以选择衍射颜料薄片中的电介质层的厚度以提供薄膜干涉,以及来自用衍射光栅图案化的层之间的界面的衍射。 在某些情况下,除了衍射效应之外,薄膜干涉还可以提供颜色偏移。