Patent ID: 6466324
Filing Date: 2002-10-15
Classification: G01B

Abstract:
A positioning stage comprising:a) a base having rectilinearly disposed x and y axes; b) a stage plate slideably supported on said base; c) at least three linear drive means rotatably engaging both said stage plate and rotatably engaging said base for moving said stage plate on a path with at least three separate drive displacements along said rectilinearly disposed x and y axes and rotation of said plate on said base substantially parallel to the surface of said base, said plate moving upon the surface of said base, whereby combined x, y rectilinear and rotary motions with respect to said base can be achieved; d) an x interferometer and receiver for determining x position; e) a y interferometer and receiver for determining y position; and, f) a device for determining yaw angle comprising a light emitting source, a cylinder lens, and a position sensing detector.