| 摘要 |
A method of manufacturing a security device comprises: conveying a transparent support layer having first and second surfaces along a transport path in a machine direction; during the conveying (a) forming an array of focussing elements on the first surface of the transparent support layer in at least a first region; and (b) applying an image array to the second surface of the transparent support layer in at least part of the first region; at least in a first registration zone the image array comprises a set of first image elements comprising portions of a first image, interleaved with a set of second image elements comprising portions of a second image, and the focussing element array can direct light from respective first or second image elements in dependence on the viewing angle. Then: optically capturing the images displayed by the security device from each a first and second viewing angle; comparing the captured images against one another and/or against stored information corresponding to the first and second images respectively and making a determination as to whether the first and second images are displayed over the expected first and second ranges of viewing angles; based on the determination, providing feedback control to thereby adjust one or more parameters of step (a) and/or step (b) when performed on subsequent parts of the transparent support layer; whereby on the subsequent parts of the transparent support layer the array of focussing elements and the image array are more accurately registered to one another in at least one direction. |
