Patent ID: 6276981
Filing Date: 2001-08-21
Classification: H01J

Abstract:
Process for making by photolithoghraphy at least one group of apertures spaced in a precise manner on a structure, this group of apertures including a first aperture or apertures made in a first layer of material and a second aperture made in a second layer of material which covers the first layer of material, the first aperture or apertures being located within the second aperture, involving:applying on a free side of the first layer of material a layer of photosensitive resin of a determined thickness,the etching of this resin layer by photolithography, by means of a single template, to leave on the aforesaid first layer of material a spot of resin per group of apertures, the exterior limit of the spot of resin corresponding to the second aperture, the spot of resin including an aperture or apertures corresponding to the first aperture or apertures,vacuum application, on the first layer and on the remaining resin, of material to form the second layer, this deposit being done so that the part of the first layer located at the bottom of the aperture or apertures of the spot of resin is not covered by this deposit,the etching of the first layer of material from the aperture or apertures of the spot to obtain the first aperture or apertures in the aforesaid first layer,elimination of the remaining resin and material from the second layer covering the aforesaid remaining resin to obtain the second aperture in the aforesaid second layer.