Patent ID: 7740994
Filing Date: 2010-06-22
Classification: G03F

Abstract:
1. A method for selecting a photomask substrate, comprising: dividing a chip area scheduled to be arranged on the photomask substrate regarding a specific transfer pattern layer into a management pattern area in which an element pattern changed in shape by birefringence of the photomask substrate is arranged, and an area other than the management pattern area; setting a standard value of a size of birefringence of an area in which the management pattern area of the photomask substrate is arranged; inspecting the size of the birefringence of the area in which the management pattern area is arranged, the area being arranged in each of a plurality of photomask substrate candidates which have no chip patterns; and selecting a photomask substrate, in which the size of the birefringence satisfies the standard value, as a photomask substrate of the specific transfer pattern layer from the plurality of photomask substrate candidates.