Patent ID: 7241537

Claim:
Method for producing a resist master having at least first and second image areas, said image areas being different from each other and at least one of said image areas having a diffraction structure, the method comprising the separate steps of: coating a substrate with a first photoresist being adjusted to the type of the first image area to be produced; exposing the first photoresist with radiation in the first image area; developing the first photoresist; applying a second photoresist layer onto the substrate, said second photoresist layer being adjusted to the type of the second image area to be produced; exposing the second photoresist with radiation in the second image area; developing the second photoresist; wherein the steps of exposing the first and the second photoresist with radiation include exposing diffraction structures in at least one of the first and the second photoresist layer; wherein for both the first photoresist layer and for the second photoresist layer, either a positive resist or a negative resist is selected respectively; and wherein in the case of a positive resist, at first the respective image area is exposed and then under the usage of a mask the surrounding area is exposed with radiation.