Patent ID: 7940150
Filing Date: 2011-05-10
Classification: G03F,H02N,Y10T

Abstract:
1. A six-degree-of-freedom precision positioning system comprising a controller and a platform; the platform including: a hollow tank being filled with a type of fluid; a base being disposed above the hollow tank and having at least four through bores symmetrically formed thereon around a center of the base; at least four cylindrical electromagnets and at least four rectangular electromagnets being symmetrically disposed on the base around the center of the base; a carrier being located above a plurality of hollow columns that are supported by the fluid in the hollow tank; and the number of the hollow columns being the same as that of the through bores on the base; and at least eight permanent magnets being mounted to a lower surface of the carrier at positions corresponding to the cylindrical electromagnets and the rectangular electromagnets.