| 摘要 |
<p>A moir6 magnification device for authenticating security articles such as banknotes. The device 22 has an array 24 of micro focusing elements 8 and an array 26 of micro images 10. The micro focusing element array 24 is aperiodic and the micro image array 26 is correspondingly aperiodic, such that one or more moire magnifications of the micro images 10 are generated when viewed from certain angles. Preferred forms generate the moir6 magnification to mimic that of a device with periodic arrays of lenses and micro image. Figure 3</p> |
