OPTICAL DEVICE

摘要

An optical device comprises a transparent substrate (20) having (?) an array of rnicrornirrors (28) on one surface of the substrate, and (ii) a corresponding array of microimage elements (24), the micromirrors (28) presenting convex surfaces to the microimage elements (24) whereby each convex surface causes ambient light to pass through the microimage element array from a virtual focus, the arrangement of the microimage elements and micromirrors being such that they cooperate to generate a lenticular type or a moire magnification effect.