Patent ID: 9004497
Filing Date: 2015-04-14
Classification: B23B,B25B,B44C,C09K,G03F,H01L,Y10S,Y10T

Abstract:
1. A device for machining a substrate comprising a turntable having an upper surface adapted to receive a substrate, a bottom part and a Venturi gap defined between the upper surface and the bottom part, the bottom part of the turntable is provided with a duct which receives a pressure medium from a pressure medium source, the upper surface of the turntable is provided with a plurality of through holes communicating with the duct for allowing the pressure medium to escape from the duct, a diffuser is inserted into the bottom part of the turntable and forms the Venturi gap, and the turntable has a chamfer on an upper circumferential edge of the turntable for directing the medium into a region below the turntable.