Patent ID: 8253059
Filing Date: 2012-08-28
Classification: H01J,H01L

Abstract:
1. A substrate cleaning apparatus comprising: a rotatable supporting plate supporting a substrate thereon; a beam generator to generate laser beams; a lens focusing the laser beams from the beam generator to generate shock waves above the supporting plate with reference to a focal point of the lens above the substrate, the beams colliding with a surface of the substrate to remove foreign substances therefrom; and a shielding unit protecting the substrate the shielding unit including a generally circular mask located above the substrate surface but below the focal point and a moving unit coupled to the mask for periodically rotating a different shielding region of the mask so as to be adjacent to the focal point, the mask positioned, when viewed from the top plane, at a side of a line bisecting the substrate by crossing the central point of the substrate.