Patent ID: 6949845

Claim:
A planar motor formed of a planar X-Y drive motor comprising: a movable stage having two pairs of S/N permanent magnets producing magnetic fluxes in a perpendicular direction with respect to a surface of the movable stage, the permanent magnets of one pair being positioned such that they are orthogonalized with respect to one axis of two axes orthogonalized to each other on a plane of the movable stage and also equidistantly apart from the other axis; a fixed stage having coils that oppose the permanent magnets, each coil being driven to move the movable stage in the planar direction of the fixed stage; a cross-shaped common electrode disposed such that it moves together with the movable stage on a plane; and a plurality of fixed electrodes having a gap with respect to the cross-shaped common electrode, each being composed of a pair of electrodes disposed to correspond to each electrode end portion of the cross-shaped common electrode, wherein capacitances of two capacitors, each of which is formed of the pair of fixed electrodes opposing the cross-shaped common electrode, remain unchanged in response to a motion in an axial direction in which the capacitors are oriented, while they exhibits differential changes in response to a motion in the other axial direction such that one of them increases and the other decreases in proportion to a displacement resulting from a displacement.