Patent ID: 9431284
Filing Date: 2016-08-30
CPC Classification: B23B,B25B,B44C,C09K,G03F,H01L,Y10S,Y10T

Claim Text:
1. A method for machining a substrate comprising the steps of: providing a turntable comprising a dish-shaped bottom plate; locating a diffuser in the dish-shaped bottom plate wherein a Venturi gap is formed by an inner rim of the dish-shaped bottom plate and a circumferential edge of the diffuser; providing a chamfer on a circumferential surface of the bottom plate proximate to the Venturi gap, whereby a pressure medium emerging from the Venturi gap is directed along the chamfer and under an upper surface of the turntable; placing a substrate on the upper surface of the turntable; supplying the Venturi gap with a pressure medium; rotating the substrate on the turntable; applying a machining medium to the substrate; and removing the substrate from the turntable.