Patent ID: 8137902

Claim:
A method of manufacturing mechanical or micro-mechanical parts of a first material able to be etched, from a substrate including at least one superficial layer of the first material, wherein the method includes the following steps: (a) forming a substantially uniform superficial layer of a second material at a surface of the at least one superficial layer of the first material, wherein the second material is able to resist a selective etch of the first material; (b) forming a bead of the second material at a periphery of the at least one superficial layer of the second material; (c) structuring the superficial layer of second material and the bead by a photolithographic process including an etch step of sufficient duration to etch the superficial layer of second material over the entire thickness thereof, wherein the etch step is insufficient to etch the bead over the entire thickness thereof, so as to obtain a first mask of the second material extending as far as the periphery of the at least one superficial layer of first material; and (d) cutting out mechanical or micro-mechanical parts, made of the first material through the first mask of the second material, by directional etching.