发明公开
EP2999597A1 OPTISCH VARIABLES ELEMENT 审中-公开
可变光元

OPTISCH VARIABLES ELEMENT
摘要:
The invention relates to an optically variable element having first and second diffraction gratings, which are high-frequency diffraction gratings and thus are reflective into the zeroth order of diffraction. Either a first color is generated by the first diffraction grating and simultaneously a second color different from the first color is generated by the second diffraction grating at a certain angle of rotation and a certain illumination angle, or a visible color is generated substantially only by the first diffraction grating at a first angle of rotation and a visible color is generated substantially only by the second diffraction grating at a second angle of rotation.
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