Method and device for structuring the surface of a hard material coated solid body by means of a laser

Abstract

A packing foil having optical diffraction effective areas and/or authentication features includes at least a first structure produced by passing a homogeneous intensity distribution spot of a laser beam having laser pulse durations in a nano-second range through a mask and a diaphragm before imaging the laser beam on at least one area of an exposed surface of the packaging foil using imaging optics positioned downstream of the mask and the diaphragm, and at least a second structure superposed on the first structure, the second structure produced by a second laser having pulse durations in the pico- or femtosecond range.

What is claimed is: 
     
         1 . A packing foil having optical diffraction effective areas and/or authentication features comprising:
 at least a first structure produced by passing a homogeneous intensity distribution spot of a laser beam having laser pulse durations in a nano-second range through a mask and a diaphragm before imaging the laser beam on at least one area of an exposed surface of the packaging foil using imaging optics positioned downstream of the mask and the diaphragm; and   at least a second structure superposed on the first structure, the second structure produced by a second laser having pulse durations in the pico- or femtosecond range.   
     
     
         2 . The packing foil according to  claim 1 , wherein the packaging foil is satinized in locations where no optical diffraction effective areas and/or authentication features or logos are present. 
     
     
         3 . The packaging foil according to  claim 1 , wherein
 a structure depth of the first structure ranges between 250-450 nm and a grating period of the first structure equals 1.5 μm, and   a structure depth of the second structure ranges between 250-400 nm and a grating period of the second structure is between 0.4 to 0.7 μm.   
     
     
         4 . The packaging foil according to  claim 1 , wherein
 the first structure comprises a grating structure, and   the second structure comprises a ripple grating structure.   
     
     
         5 . The packaging foil according to  claim 1 , wherein the first structure comprises a trench-shaped grating structure having grating periods of 1 to 2 μm. 
     
     
         6 . The packaging foil according to  claim 1 , wherein the second structure comprises a parallel wave grating structure having a grating period of 500 to 800 nm and a trench depth of 300 nm. 
     
     
         7 . The packaging foil according to  claim 6 , wherein the second structure comprises a parallel wave grating structure having a grating period of 500 to 800 nm and a trench depth of 300 nm. 
     
     
         8 . The packaging foil according to  claim 1 , further comprising an additional second structure superposed on the second structure, the additional second structure having an orientation different from an orientation of the second structure. 
     
     
         9 . The packaging foil according to  claim 1 , further comprising
 an additional first structure; and   an additional second structure superposed on the additional first structure,   wherein the first structure and the second structure superposed on the first structure are juxtaposed with the additional first structure and the additional second structure superposed on the additional first structure.   
     
     
         10 . The packaging foil according to  claim 1 , further comprising
 an additional first structure produced by passing the homogeneous intensity distribution spot of the laser beam having laser pulse durations in the nano-second range through a different mask and a different diaphragm.   
     
     
         11 . The packaging foil according to  claim 1 , further comprising
 an additional first structure produced by rotating the mask and passing the homogeneous intensity distribution spot of the laser beam having laser pulse durations in the nano-second range through the mask and the diaphragm.   
     
     
         12 . The packaging foil according to  claim 1 , wherein the first structure produced by passing the homogeneous intensity distribution spot of the laser beam having laser pulse durations in the nano-second range is measured by a diffractometer and the measured values are used for adjusting an intensity of the laser beam and/or imaging optics and a focusing optic.