Patent ID: 7300823

Claim:
A method for producing an apparatus for housing a micromechanical structure, comprising the steps of: a) providing a substrate having a main side on which the micromechanical structure is formed; b) depositing a first and a second photo-resist layer on the main side such that the second photo-resist layer is formed between the first photo-resist layer and the substrate, wherein the first photo-resist layer is formed of a first photo-resist material and the second photo-resist layer of a second photo-resist material, the first photo-resist material and the second photo-resist material are a positive resist, and the first photo-resist material has a lower resist sensitivity than the second photo-resist material, irradiating and subsequently developing the photo-resist material by c1) selectively irradiating the first and the second photo-resist layer at an opening region with a first dose; c2) selectively irradiating the first and the second photo-resist layer at a cap region with a second dose, which is lower than the first dose; and c3) developing the first and the second photo-resist layer to form a cap portion in the first photo-resist layer and a frame portion in the second photo-resist layer, wherein the frame portion runs around the micromechanical structure on the main side of the substrate, and the cap portion spans the mechanical structure from the frame portion with a distance to the micromechanical structure and has the opening; and e) closing the opening to close the cavity.