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IMPROVEMENTS IN AND RELATING TO SECURITY DEVICES
IMPROVEMENTS IN AND RELATING TO SECURITY DEVICES
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机译:安全设备的改进和与安全设备有关
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摘要
A security device (1) comprising an optically transparent layer (3) including a repeating first array of separate optical focussing elements (3) (e.g. having translational symmetry) wherein a pitch distance between repeated elements in the first array is a first pitch value (A). The device also includes a repeating second array of separate image elements (6) (e.g. having translational symmetry) collectively defining an image viewable through the first part. The device is structured such that a pitch distance between repeated or successive elements in the second array is a second pitch value (B) wherein the ratio (A/B) of the first pitch value and the second pitch value has a value, A/B = n ± Δ, that differs from a positive integer value, n, according to an absolute difference, Δ, not exceeding 0.01 and not less than 0.001.
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机译:一种安全装置(1),包括光学透明层(3),包括重复的单独光学聚焦元件(3)(例如具有平移对称)的重复第一阵列,其中第一阵列中的重复元素之间的间距距离是第一间距值(一种)。该设备还包括重复的第二阵列的单独图像元素(6)(例如,具有平移对称),其共同定义通过第一部分可视的图像。构造装置使得第二阵列中的重复或连续元件之间的间距距离是第二间距(b),其中第一间距值和第二间距值的比率(a / b)具有值,a / B = n±δ,其不同于正整数值n,根据绝对差,δ,不超过0.01,不小于0.001。
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