Patent ID: 8936832
Filing Date: 2015-01-20
Classification: G03F,H01L

Abstract:
1. A method for wet treatment of plate-like articles in a device, the method comprising the steps of: placing a plate-like article on a chuck, of the device, for horizontally holding a plate-like article to be treated, the chuck having an upwardly facing surface at least underneath the plate-like article's edge, the upwardly facing surface being outwardly bordered by a downwardly-turned circumferential lip, the chuck having an outer diameter greater than the greatest diameter of the plate-like article to be treated, the device further including a rotatable part with an upwardly facing ring-shaped surface for receiving liquid running off the circumferential lip of the chuck, the ring-shaped surface located below the chuck, wherein the rotatable part and the ring-shaped surface rotates faster than the plate-like article, and wherein the inner diameter of the ring-shaped surface is smaller than the outer diameter of the chuck so that the circumferential lip of the chuck overlaps an inner edge of the ring-shaped surface allowing the liquid running off the downwardly-turned circumferential lip of the chuck to fall downward onto the upwardly facing rotating ring-shaped surface of the rotatable part along a first gap therebetween, dispensing liquid onto the upwardly facing surface of the plate-like article, letting the liquid flow towards the edge of the plate-like article, letting the liquid run off the plate-like article onto the upwardly facing surface of the chuck, and letting the liquid run off the upwardly facing surface over the downwardly-turned circumferential lip of the chuck and fall downward along the first gap onto the upwardly facing rotating ring-shaped surface of the rotatable part, whereafter the liquid is accelerated and radially spun off the rotating ring-shaped surface of the rotatable part; wherein the rotatable part comprises air inlets positioned radially inwardly of said first gap and configured to generate an air flow upon rotation of at least one of the rotatable part and the chuck, the air flow proceeding from the air inlets radially outwardly to the first gap so as to purge the first gap.