Patent ID: 8089638

Claim:
A stage, comprising: a fixed base; a movable table installed to be movable with respect to the fixed base; a first elastic support for supporting the movable table with respect to the fixed base; a first actuator for generating a displacement of the movable table in one direction; a first displacement converting means connected to the movable table and the fixed base so as to convert the unidirectional displacement of the movable table into a rotational displacement about a connection point thereof to the fixed base; a first displacement measuring means attached to the fixed base for measuring the converted rotational displacement; a sub table installed to be movable with respect to the movable table; a second elastic support for supporting the sub table with respect to the movable table; a second actuator for generating a displacement of the sub table in a direction perpendicular to the unidirectional displacement of the movable table; a second displacement converting means connected to the movable table and the sub table so as to convert a displacement of the sub table into a rotational displacement about a point thereof connected to the movable table; and a second displacement measuring means for measuring the displacement converted by the second displacement converting means.