Patent ID: 7316933

Claim:
A method for producing an annular microstructure element, the method comprising: providing a substrate with a surface; forming at least one masking layer on the substrate, so tat the masking layer covers the surface; forming an opening in the masking layer for the purpose of uncovering a region of the surface, the opening including an overhang in such a way that the uncovered region is at least partially shaded from an incident particle beam by the overhang; depositing at least one material on a first partial area of the uncovered region by means of a particle beam that is directed at the substrate at an oblique angle of incidence, the angle of incidence forming an angle other than 90° with the surface, and a divergence of less than 10°; and rotating the substrate with the masking layer and the opening relative to the directed particle beam for the purpose of depositing the material on at least a second partial area of the uncovered region for the purpose of forming an annular microstructure element on the uncovered region of the substrate.