Patent ID: 6864963
Filing Date: 2005-03-08
Classification: G03F

Abstract:
1. A position measuring system comprising: a pedestal; a stage mounted on the pedestal in a movable way; a driving device for moving the stage; a first bar mirror and at least two first position measuring devices for measuring a position of the stage; a second bar mirror and at least two second position measuring devices for measuring the position of the stage, the first bar mirror and the second bar mirror being disposed in substantially parallel with each other; and a controlling device for controlling the position measuring system; wherein when the stage is moved along a specific direction, the controlling device utilizes the first bar mirror and the first position measuring devices to measure the position of the stage during a first period, and utilizes the second bar mirror and the second position measuring devices to measure the position of the stage during a second period partially overlapping with the first period, and utilizes the position measured by the first bar mirror and the first position measuring devices to adjust the position measured by the second bar mirror and the second position measuring devices during an overlapping period of the first period and the second period.