Patent ID: 8964167
Filing Date: 2015-02-24
Classification: G03F,H01L

Abstract:
1. An exposure apparatus for forming a nanoscale pattern directly on the surface of a cylinder, the exposure apparatus comprising: a cylindrical magnetic levitation stage installed in a chamber; a light source installed at the top of a cylindrical mold in the chamber; and a differential vacuum unit installed at the top of the cylindrical mold and having a spherical or non-spherical bottom to create a partial vacuum environment between the light source and the cylindrical mold, the cylindrical magnetic levitation stage comprising: a cylinder operating unit for rotation and a cylinder operating unit for linear movement, which support both sides of a cylindrical mold and is rotated and linearly moved by magnetic levitation force and magnetic moving force generated by the interaction between permanent magnets and electromagnets; and a cylinder fixing unit for rotation and a cylinder fixing unit for linear movement, which are disposed at the bottom of the cylinder operating unit for rotation and the cylinder operating unit for linear movement, respectively, to support the cylindrical operating units in a non-contact manner, wherein a vacuum pressure of the differential vacuum unit is controlled such that the distance between the light source and the cylindrical mold is finely controllable.