Patent ID: 7274814
Filing Date: 2007-09-25
Classification: G03F,G06K,G06T,Y10S

Abstract:
1. A multidirectional overlay mark for determining the overlay between at least two separately generated patterns on a single or successive layers of a substrate, the multidirectional mark, comprising: a first region having at least two separately generated working zones, that are juxtaposed relative to one another, and are configured to provide overlay information in a first direction, and each include a periodic structure comprised of a plurality of coarsely segmented elements positioned therein; a second region having at least two separately generated working zones, that are juxtaposed relative to one another, and are configured to provide overlay information in the first direction, and each include a periodic structure comprised of a plurality of coarsely segmented elements positioned therein; a third region having at least two separately generated working zones, that are juxtaposed relative to one another, and are configured to provide overlay information in a second direction that differs from the first direction, and each include a periodic structure comprised of a plurality of coarsely segmented elements positioned therein; and a fourth region having at least two separately generated working zones, that are juxtaposed relative to one another, and are configured to provide overlay information in the second direction, and each include a periodic structure comprised of a plurality of coarsely segmented elements positioned therein, wherein the working zones of the first and second regions that were generated together are diagonally opposed and spatially offset relative to one another, wherein the working zones of the third and fourth regions that were generated together are diagonally opposed and spatially offset relative to one another.