Patent ID: 9665013
Date: 2017-05-30
CPC Classifications: G03F

Claim:
1. Wafer table ( 8 ) for supporting a wafer ( 1 ) during processing of said wafer in a lithography system, said wafer table ( 8 ) having a top side ( 2 ) provided with burls ( 7 ) for supporting said wafer ( 1 ), wherein said burls have a height above said top side, said wafer table ( 8 ) comprising a circumferential gutter located circumferential and directly adjacent to a wafer carrying part ( 2 ) of the wafer table, said gutter having a width larger than the height of said burls ( 7 ), wherein an outer rim of said wafer table comprises a ring having a fixed position on said outer rim and which is arranged for leaving a very small vertical distance ( 9 B) to said wafer ( 1 ) when said wafer ( 1 ) is supported by the burls ( 7 ), wherein said gutter is arranged below a plane defined by said top side in a manner that liquid is flowable in said gutter from said top side, and wherein said ring is arranged circumferential to said gutter, wherein the gutter is arranged on the inside of the ring, and said ring extends at least partially above said plane, wherein said wafer table is adapted for being moved into and out of the lithography system while the wafer is clamped to the wafer table by means of a stationary layer of liquid which is spaced apart from the gutter and arranged in a gap between the top side of the wafer table and a bottom side of the wafer.