Patent ID: 7807342
Filing Date: 2010-10-05
Classification: G03F

Abstract:
1. A method of imaging patterns in a photolithography process using a mask, the method comprising the steps of: providing a transparent support glass having a first light attenuator secured to said transparent support glass and a second light attenuator secured to said transparent support glass; effectuating an ultraviolet light exposure of a photoresist material to create therein a first pattern of features having a first feature density imposing a first amount of attenuation on ultraviolet light produced by a light source, said first light attenuator for imposing the first amount of attenuation on said ultraviolet light that passes through said transparent support glass; effectuating an ultraviolet light exposure of the photoresist material to create therein a second pattern of features having a second feature density which differs from said first feature density, including imposing on said ultraviolet light produced by the light source a second amount of attenuation that differs from said first amount of attenuation, said second light attenuator for imposing on said ultraviolet light that passes through said transparent support glass the second amount of attenuation; and wherein all the features of the first and second patterns are created by effectuating the ultraviolet light exposure through portions of the mask having either the first or second amount of attenuation.