LENTICULAR DEVICE

摘要

A lenticular device in which first and second arrays of lenticular elements are located on first and second surfaces of the device. The first and second arrays are arranged such that, when the second array is viewed through the first array, a Moiré pattern showing an enlarged image representing an element of the second array is visible. At least one of the arrays may include at least one predetermined and verifiable discontinuous variation, the variation being in a characteristic of at least one of the elements of the array with respect to the same characteristic of an adjacent element of the array. At least one of the elements may include an embossment providing the at least one of the elements with a cross-section, parallel to the surface on which the at least one of the elements is formed, which is irregular in shape compared to a parallel cross-section through a part of the at least one element not including said embossment. At least one predetermined and verifiable defect may be encoded into at least one of the first and second arrays, which defect is substantially indiscernible to an unaided observer.