Patent ID: 6030266
Filing Date: 2000-02-29
Classification: G03F,H01J

Abstract:
A process for the formation of patterns in a photoresist layer comprising:forming a plurality of non-mutually interfering elementary light beams at a surface of the photoresist layer;performing at least one first relative translation at a constant speed and constant light power of said elementary beams with respect to the photoresist layer, the elementary beams being focused on the photoresist, so as to irradiate first parallel lines of said photoresist layer, said speed and said power being chosen in such a way that each first irradiated parallel line receives a first light dose lower than the light dose necessary for the development of said photoresist layer;performing a relative rotation by a given angle of all the elementary light beams with respect to the photoresist layer;performing at least one second relative translation, at constant speed and constant light power, of said elementary beams with respect to the photoresist layer, the elementary beams being focused on the photoresist layer, so as to irradiate second parallel lines of said photoresist layer which intersect said first parallel lines, said speed and said light power being chosen in such a way that each irradiated second parallel line receives a second light dose equal to the difference between the light dose necessary for the development and the first light dose, so that only the intersections of the first and second lines receive the dose necessary for the development; anddeveloping the photoresist such that patterns are formed at said intersections.