Patent ID: 6780294
Filing Date: 2004-08-24
Classification: C23C,H01J

Abstract:
An improved shield assembly for a substrate processing chamber comprising:an adapter plate functioning to support a target assembly, the plate having a central opening defined by a first cylindrical extent of a first diameter and a second cylindrical extent of a second reduced diameter, the adapter having upper and lower peripheral edges, a pair of opposed locking apertures formed within the upper peripheral edge; an upper shield having upper and lower peripheral edges, a series of threaded apertures formed within the lower peripheral edge an d a pair of opposed flanges integral with the upper peripheral edge, each of the flanges having a locking aperture formed therein, the upper shield having a side wall which tapers outwardly from the upper to the lower peripheral edge, the shield being positioned within the central opening of the adapter such that the lower peripheral edge of the upper shield abuts the second cylindrical extent of the adapter with the locking apertures of the upper shield and adapter being aligned; a target collimator having a diameter and an apertured peripheral edge, the peripheral edge being positioned adjacent the lower peripheral edge of the upper shield such that the apertures of the collimator are aligned with the threaded apertures of the upper shield; a lower shield defined by an upper opening of a first diameter and a lower opening of a second reduced diameter, the lower opening functioning to receive a wafer pedestal, the upper opening having a flanged peripheral edge, with apertures formed therein. the lower shield being positioned adjacent the peripheral edge of the target collimator, such that the apertures of the collimator are aligned with the apertures of the lower shield; a series of threaded fasteners secured within the apertures of the lower shield, the apertures of the collimator and the threaded apertures of the upper shield, the series of fasteners serving to secure as a unit the collimator and the upper and lower shields; a pair of locking fasteners removably secured within the locking apertures of the upper shield and adapter, the locking fasteners permitting the collimator, the upper shield, and the lower shield to be removed from the adapter as a unit, with the first diameter of the lower shield and the diameter of the collimator being smaller than the diameter of the second cylindrical extent thereby permitting removal from the upper peripheral edge of the adapter.