Patent ID: 6503050
Filing Date: 2003-01-07
Classification: F01D,F04D

Abstract:
A vacuum processing system, comprising:(a) a vacuum processing chamber; and (b) a turbo-molecular pump disposed on the vacuum processing chamber, including: i) a casing having an inlet port and an outlet port; ii) a stator having a plurality of rows of stator blades extending radially inwardly; (iii) a motor disposed coaxially with a rotor; and (iv) the rotor having a plurality of rows of rotor blades extending radially outwards from an outer surface of the rotor, the rows of rotor blades disposed in an alternating arrangement with the rows of stator blades, wherein the blades of at least one row of rotor blades and the blades of at least one row of stator blades adjacent the inlet port are about 50% longer than the other rows of rotor and stator blades and an outer diameter of the pump is enlarged in an area of the longer rotor and stator blades.