Virtual Spindle Single Diamond Turning System for Anti-counterfeiting and Security Packaging

This method virtually constructs a rotation axis through the centre by combining the two translational servo motions on the plane which is perpendicular to the physical spindle axis. Through controlling the virtual spindle axis to pass through centres of all the microstructure cells, large-scale arrayed microstructures can be obtained.

Applying this virtual spindle on diamond turning system can fabricate discontinuous micro optics arrays on both planar and freeform surfaces. The discontinuous structure arrays scale is from tens of micrometers to hundreds of micrometers, even some special structures, e.g. 3D pattern, can also be fabricated. The micro structures can be applied to some valuable products, luxury goods or even bank notes in their security features, and generating multicoloured effects on some metal surfaces.