Patent ID: 6535539
Filing Date: 2003-03-18
Classification: F16C,H01S

Abstract:
A gas laser device including a halogen gas includinga cross flow fan disposed in a chamber for circulating a laser gas by rotating a blade section around a rotation shaft, magnetic bearings having outer ring magnet coils mounted in the vicinity of both ends of the inner wall of said chamber and inner ring magnetic substances attached to the outer portions of both sides of said blade section of the outer peripheral face of said rotating shaft and facing the inner peripheral faces of said outer ring magnet coils with predetermined spaces between them respectively, for rotatably supporting said rotating shaft by magnetic force generated by said outer ring magnet coils and said inner ring magnetic substances, a motor having a stator mounted in the vicinity of an end of the inner wall of said chamber and generating a rotating magnetic field at a predetermined frequency which is variable and a rotor attached to the outer peripheral face of said rotating shaft and facing the inner peripheral face of said stator with a predetermined space between them, for rotating said rotor by the rotating magnetic field of said stator to directly and rotationally drive said cross flow fan, a thin cylindrical outer ring partition which is a separate member from said outer ring magnet coils and said stator and is of a material non-corrosive to the laser gas, extending in a continuous manner at a location intermediate said outer ring magnet coils and said stator, and said inner ring magnetic substances and said rotor respectively, to prevent contact of said laser gas with said outer ring magnet coils and said stator, and a thin cylindrical inner ring partition which is a separate member from said inner ring magnetic substance and said rotor and is of a material non-corrosive to the laser gas, extending in a continuous manner at a location intermediate said inner ring magnetic substances and said rotor, and said outer ring magnet coils and said stator respectively, to prevent contact of said laser gas with said inner ring magnetic substances and said rotor.