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1.发明授权Optically variable form birefringent structure and method and system and method for reading same 有权光学可变形双折射结构及其读取方法及系统及方法公开(公告)号：US06975765B2
公开(公告)日：2005-12-13
申请号：US10431300
申请日：2003-05-06
CPC分类号： B42D25/391 , B42D25/00 , B42D25/23 , B42D25/328 , B42D25/425 , G02B5/1809 , G02B5/1857 , G02B5/3083 , G03H1/0011 , G03H1/0244 , G03H1/028 , G03H1/041 , G03H2001/0288
摘要： An anticounterfeiting device comprising a surface relief structure having both diffractive and polarizing properties. Polarization of reflected light is controlled by the orientation and composition of a fine grating structure whose shortest period is substantially smaller than the wavelength of visible light; and diffraction is controlled by a longer period component of the grating structure having a second orientation. Presence and arrangement of the polarizing properties of the device are detected by illuminating the device with polarized light and viewing the reflected light, or by illuminating the device with unpolarized light and viewing reflected light through a polarizer. Because such a device is difficult to copy or reverse engineer precisely, the authenticity of the device can be judged by the presence and arrangement of the polarization properties and the diffraction properties in the device.
摘要翻译： 一种防伪装置，包括具有衍射和偏振性质的表面浮雕结构。 反射光的极化由最短周期远小于可见光波长的精细光栅结构的取向和组成来控制; 并且衍射由具有第二取向的光栅结构的较长周期分量控制。 通过用偏振光照射装置并观察反射光，或者通过用非偏振光照亮装置并通过偏振器观察反射光来检测装置的偏振特性的存在和排列。 由于这样的装置难以精确地复制或逆向工程，所以可以通过设备中的偏振特性和衍射特性的存在和布置来判断装置的真实性。
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