Patent ID: 6612160
Filing Date: 2003-09-02
Classification: G01B,G01D,G01Q,Y10S

Abstract:
An assembly for a metrology apparatus, the assembly comprising:an actuator including a first actuator stage configured to controllably move in first and second orthogonal directions, and a second actuator stage adjacent to said first actuator stage and configured to controllably move in a third direction orthogonal to the first and second orthogonal directions; a reference structure having first and second ends wherein the first end is fixed relative to movement of said second actuator stage; a multi-bar linkage assembly fixed to said second end of the reference structure; and a coupling coupled to said second actuator stage and to said multi-bar linkage, wherein said second actuator stage and the coupling are configured to move said linkage in the third orthogonal direction in a manner that substantially isolates the linkage from any second actuator stage motion in the first and second directions.