Patent ID: 7507506
Filing Date: 2009-03-24
Classification: G03F

Abstract:
1. A method of creating multi-layer masks comprising: analyzing masking requirements of a pre-coated quartz photomask, comprising: coating the photomask with a photoresist; exposing said less critical sub-fields and patterns on a first mask writer where a maximum image size and image placement control are not required, moving the photomask from the first mask writer to a second mask writer, located outside said first mask writer, exposing said more critical sub-fields and patterns that require a maximum image size and placement control with the second mask writer; developing the photoresist to reveal latent images that are formed in said first mask writer and said second mask writer; transferring pattern of the photoresist to an underlying masking layer by using one of direct chemical attack or reactive-ion etching; and removing the photoresist from the photomask.