Patent ID: 8062735

Claim:
A secure document comprising: a core layer; a retroreflective material applied to the core layer, the retroreflective material being on a surface of the secure document, and wherein different directional grayscale images are laser engraved in the same location on the retroreflective material at corresponding first and second angles of incidence wherein the different directional images laser engraved at the same location represent different types of information about a bearer of the secure document; and wherein the retroreflective material is selectively applied to an area, but less than the entire area of the surface and forming a pre-determined or personalized pattern; and wherein, the laser engraving is carried out with a neodymium:yttrium aluminum garnet (Nd:YAG) laser having a wavelength output of about 1064 nm, operating at 10 watts maximum, a beam diameter of about 2.3 mm to 10 mm, and a frequency of about 50 Khz.