| 摘要 |
<p>A security document is disclosed, comprising a document substrate having at least two transparent or translucent windows spaced apart from one another, and a device comprising a transparent substrate carrying:
i) a regular array of micro-focusing elements on a first surface, the focusing elements defining a focal plane;
ii) a corresponding first array of microimage elements in a first colour and located in a plane substantially coincident with the focal plane of the focusing elements; and,
iii) a corresponding second array of microimage elements, in a second colour different from the first colour, and located in a plane substantially coincident with the focal plane of the focusing elements. At least a portion of the first array of microimage elements is not overlapped by the second, and at least a portion of the second array of microimage elements is not overlapped by the first. The pitches of the micro-focusing elements and first and second arrays of microimage elements and their relative locations are such that the array of micro-focusing elements cooperates with each of the first and second arrays of microimage elements to generate respective magnified versions of the microimage elements of each array due to the moiré effect. The device is incorporated into or applied on to the document substrate in alignment with the at least two windows, and is registered to the document substrate such that, the magnified version of the first microimage element array is visible through the first of the two windows and the magnified version of the second microimage element array is visible through the second of the two windows. The transition between the two microimage element arrays is concealed by the document substrate between the two windows.</p> |
