Patent ID: 6238850
Filing Date: 2001-05-29
Classification: G03F

Abstract:
A method of forming an image in a photosensitive layer comprising the steps of:first exposing a photoresist layer to a first mask having a first image, said first image having at least two edges and wherein first exposing step is a partial exposure step which is carried out using a dose of electromagnetic energy having a predetermined wavelength said dose being less than the full dose required for full exposure of said photoresist layer;second exposing said photoresist layer to a second mask having a second image, said second image having at least two edges, the second image edges being substantially rotated relative to the first image edges to produce a latent image in said photoresist layer having edges substantially rotated relative to the first and second image edges, said second exposing step is a partial exposure step which is carried out using a dose of electromagnetic energy having a predetermined wavelength, said dose of electromagnetic energy being less than the full dose required for fill exposure of said photoresist layer; anddeveloping the photoresist layer to produce said image.