Patent ID: 6770890
Filing Date: 2004-08-03
Classification: H01J

Abstract:
In a stage device including a guide bar extending along a longitudinal axis, a slider slidably attached to the guide bar in a manner allowing the slider to slide relative to the guide bar along the longitudinal axis, and a stage platform connected to the slider, an actuator for moving the stage platform in a direction parallel to the axis, the actuator comprising:a first linear motor situated on a first side of the guide bar and a second linear motor situated on a second side of the guide bar such that the first and second linear motors are situated in a bilaterally symmetrical manner relative to the axis; and each of the first and second linear motors comprising a respective stator and a respective mover, the respective stators extending parallel to the axis, and the respective movers being attached to the slider such that energization of the first and second linear motors causes synchronous movement of the movers relative to the respective stators and thus movement of the slider along the guide bar in the direction of the axis.