Patent ID: 7144690

Claim:
A photolithographic method comprising forming overlapping exposure patterns on a photosensitive material from light passed through a single reticle; the reticle being displaced relative to the photosensitive material between a first exposure to a first light and a second exposure to a second light so that a first pattern of the first light produced by the first exposure is offset and overlapping on the photosensitive material relative to a second pattern of the second light produced by the second exposure, the first and second patterns comprising regions of the photosensitive material exposed to the first and second light, respectively, and regions of the photosensitive material unexposed to the first and second light, respectively; either an entirety of the exposed regions from each of the first and second patterns being extended entirely through the photosensitive material or an entirety of the unexposed regions from each of the first and second patterns being extended entirely through the photosensitive material; and wherein no portion of the photoresist is exposed to both the first light and the second light.