Patent ID: 7052808
Filing Date: 2006-05-30
Classification: G03F

Abstract:
1. A photomask apparatus, comprising: a transparent support glass; a first light attenuator secured to said transparent support glass and cooperable therewith for creating in a photoresist material a first pattern of features having a first feature density, said first light attenuator for imposing a first amount of attenuation on light that passes through said transparent support glass; and a second light attenuator secured to said transparent support glass and cooperable therewith for creating in the photoresist material a second pattern of features having a second feature density that differs from said first feature density, said second light attenuator for imposing on light that passes through said transparent support glass a second amount of attenuation that differs from said first amount of attenuation, where the first light attenuator and second light attenuator include first and second portions of a single layer of partial light shielding material overlying and secured to the transparent support glass, the first amount of attenuation corresponding to a thickness of the first light attenuator from the support glass and the second amount of attenuation corresponding to a thickness of the second light attenuator from the support glass, where the thickness of the first light attenuator differs from the second light attenuator.