Patent ID: 6177975
Filing Date: 2001-01-23
Classification: G02F

Abstract:
A method for aligning two plates comprising the steps of:providing a first plate having a lithographically patterned structure formed on a first surface and a second plate having a lithographically patterned structure formed on a second surface, the first and second surfaces being disposed to face each other, the patterned structures of the first and second plates having corresponding and opposing edges to provide an interference fit between the patterned structures of the first and second plates;coarsely aligning the first plate with the second plate in a first state wherein the first state includes an interference between the patterned structures;adjusting at least one of the first plate and the second plate to provide a second state having a clearance fit between the patterned structures of the first and second plates; andmoving the first and second plates together and returning to the first state to align the first and second plates relative to each other.