Patent ID: 6670632
Filing Date: 2003-12-30
Classification: G03F

Abstract:
A reticle located in a projection area of an optical exposure apparatus comprising:a first area including a desired circuit pattern and a second area including alignment marks arranged at specific positions; said first area and said second area being located in an exposure range of an optical exposure apparatus; each of said alignment marks comprising mark elements arranged to form a first geometric shape; each of said mark elements comprising main sub-elements arranged in a specific direction at first pitches forming a first dimension of a second geometric shape, a first auxiliary sub-element located at one end of said second geometric shape, a second auxiliary sub-element located at the other end of said second geometric shape, each of said main sub-elements, said first auxiliary sub-element, and said second auxiliary sub-element including only non-intersecting geometric shapes, each of said mark elements having a dimension equal to a second dimension of said second geometric shape; said first auxiliary sub-element being apart from a first one of said main sub-elements at a second pitch; said second auxiliary sub-element being apart from a second one of said main sub-elements at a third pitch; each of said main sub-elements being resolvable in said optical exposure apparatus; and each of said first and second auxiliary sub-elements being irresolvable in said optical exposure apparatus.