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首页> 外文会议>Conference on Optical Security and Counterfeit Deterrence Techniques >Diffractive moire features for optically variable devices
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Diffractive moire features for optically variable devices

机译：光学变量器件的衍射莫尔特征

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We present diffractive second-line security features based on the moire phenomenon, that are designed for use in Optically Variable Devices (OVDs). After a short introduction of our 2D and 1D moire methods, we first present the integration of line-based, 1D animated moire patterns into OVDs. These covert features are verified using a printed, high-resolution screen, which causes the covert information to become visible. When the screen is moved back and forth, the covert information, for example a text, appears to move dynamically in a well defined way. We then present diffractive OVDs where specially designed 2D moire features have been integrated into graytone images. Such an integration has the advantage that the area in which the second-line security feature appears can be used simultaneously for a visually attractive first-line effect rather than just having a homogeneous background. The integrated diffractive moire features are verified with a 2D microlens array through which the OVD is viewed; as the verifier or the OVD together with the verifier is moved, one observes dynamic visual effects. A special form of integrating a diffractive moire-feature into an OVD is shown in the last part of the paper, where the 2D microlens verifier is used in a fixed combination together with the information layer that consists of diffractive microstructures. Such a diffractive moire-magnifier feature is characterized by the unique visual impression that it creates where projected images appear to move as the sample is tilted.
机译：我们基于Moire现象呈现衍射二线安全特征，该特征被设计用于光学变量装置（OVDS）。在简短介绍我们的2D和1D Moire方法后，我们首先将基于线的1D动画莫尔模式的集成到OVDS中。这些隐蔽功能使用印刷的高分辨率屏幕来验证，这会导致隐蔽信息变得可见。当屏幕来回移动时，封面信息（例如文本）似乎以明确的方式动态移动。然后，我们存在衍射OVD，其中专门设计的2D莫尔特征已被集成到Graytone图像中。这种积分具有以下优点：第二线安全特征出现的区域可以同时用于视觉上有吸引力的一线效果，而不是仅具有均匀的背景。用2D微透镜阵列验证集成的衍射莫尔特征，通过该阵列通过该阵列进行验证。随着验证者或OVD与验证者一起移动，一个人观察到动态视觉效果。在纸张的最后一部分中示出了将衍射莫尔特征集成到OVD中的特殊形式，其中2D微透镜验证器与由衍射微结构组成的信息层一起使用固定组合。这种衍射莫尔放大镜特征在于唯一的视觉印象，即它创建投影图像随着样品倾斜时的移动。

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