Patent ID: 8605294
Filing Date: 2013-12-10
Classification: G01D

Abstract:
1. An actuating apparatus comprising: a motion driving module to be rigidly coupled to a platform having a reference region that has speckle features and that is associated with a coordinate system; a working stage coupled to and driven by said motion driving module to move relative to the platform; a speckle image capturing module rigidly coupled to said working stage so as to be movable relative to the platform along with said working stage, and capable of capturing a speckle image of a sub-region of the reference region; and a control module operatively associated with said motion driving module and said speckle image capturing module, and operable in a positioning mode, where said control module obtains a current position of said working stage in the coordinate system based on a comparison between the speckle image captured by said speckle image capturing module and reference speckle image information that is associated with and unique to the reference region of the platform, and controls said motion driving module to drive said working stage toward a target position in the coordinate system based on a difference between the current position of said working stage and the target position.