Patent ID: 6863736
Filing Date: 2005-03-08
Classification: C23C,H01J,H01L

Abstract:
1. A rotating shaft adapted for extending between two regions having differnt ambient pressures, comprising: a rotatable hollow shell formed of a poorly conductive material and adapted for positioning in one of said regions, an inner shaft having a hollow distal portion for positioning in another one of said regions and a proximal portion at least partially disposed in said hollow shell in a spaced apart relationship with a limited number of contact points with the shell, a heat conducting shaft disposed in said hollow distal portion of the inner shaft so as to form good thermal contact therewith, a plurality of thermal breaks disposed between the outer shell and the inner shaft to impede heat transfer between the outer shell and the inner shaft, and a rotary seal coupled to said distal portion of the inner shaft for maintaining pressure differential between said two regions.