Patent ID: 7880880
Filing Date: 2011-02-01
Classification: G03F

Abstract:
1. An alignment mark formed on an object for use in manufacture of a microdevice, the alignment mark comprising a plurality of targets that each include a detection grating that is configured to align the object during manufacture of the microdevice and that is separate from the microdevice, wherein at least one of said detection gratings is formed by a plurality of repetitive patterns arranged in a first pitch and wherein at least one of the plurality of repetitive patterns is divided to form a sub-pattern that is configured to change under microdevice processing in correspondence with changes to said microdevice during manufacture, wherein the plurality of repetitive patterns is a plurality of lines that are repeated in a first direction, wherein the sub-pattern is formed by a plurality of repetitive lines that are repeated in a second direction and arranged in a second pitch, the first direction being different from the second direction.