Stage device with frame-shaped member movable in at least...

Details Stage device with frame-shaped member movable in at least... Stage device with frame-shaped member movable in at least...

2005-06-08

2009-02-10

Nguyen, Hung Henry (Department: 2851)

Photocopying

Projection printing and copying cameras

Detailed holder for original

C355S072000

Reexamination Certificate

active

07489389

ABSTRACT:
A stage device includes a stage and a frame-shaped member that move in three degrees of freedom directions in a two-dimensional plane while floating above a surface plate. The stage also holds an object. First fixed elements and second fixed elements are fitted to the frame-shaped member, and cooperate with first movable elements and second movable elements to generate drive forces to drive the stage in the two-dimensional plane. A reaction force generated by the driving of the stage acts on the first and/or second fixed elements, and causes the frame-shaped member to move in the two-dimensional plane. Because the reaction force caused by the movement of the stage is substantially completely cancelled, and because the movement of a center of gravity of a system including the stage and the frame-shaped member does not occur, no unbalanced load acts on the surface plate.

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