Improvements in security devices


A security device 10 comprises a carrier substrate 11 and a light deflection structure 12 applied to one surface of the carrier substrate 11; the light deflection structure 12 has a reflection layer 14 applied in a first region 15 and at least one second region 16 with no reflection layer applied; the reflection layer 14 provides a strong reflection parallel to incident light when incident light is at an angle away from the normal to the security device 10 and the first and second regions define indicia. The carrier substrate 11 may be transparent or translucent; the reflection layer 14 may be a metallic coating and the light deflection structure 12 may be a prismatic or lenticular structure or a fresnel lens. The security device 10 preferably forms part of a security document.




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