Patent ID: 7387687
Filing Date: 2008-06-17
Classification: C23C,C30B,F27B,H01L

Abstract:
1. A system for an apparatus of the type adapted to treat substrates and/or wafers, the system comprising a stationary base element and a movable support for at least one substrate or at least one wafer, the support being rotatable above the element about a stationary axis, the element including a chamber being provided between the element and the support, and at least one duct being provided for the admission of at least one gas-flow to the chamber in order to raise the support, the system comprising means for converting the flow of gas into the chamber into rotation of the support, said means comprising a plurality of channels each of which is defined between the element and the support and is in communication with the chamber, and each of said channels has a shape and size such that the gas that is present in the chamber, as a result of inward flow of the gas, flows through the channels as a result of pressure in the chamber and causes the support to rotate as a result of fluid-dynamic drive characterized in that each of said channels has a depth that gradually reduces along its extent in a direction away from the said chamber.