Patent ID: 7556246
Filing Date: 2009-07-07
Classification: H01L

Abstract:
1. An unloading method of an object vacuum-chucked on a mounting table having one or more gas flow paths opened at one or more locations on the mounting table, comprising the steps of: (a) cutting off a vacuum in the gas flow paths, the vacuum being used in vacuum-chucking the object; (b) lifting the object from the mounting table by using an object lifting unit, the lifting including a first and a second lifting step, wherein an object lifting speed in the second object lifting step is higher than that in the first object lifting step, the object lifting unit includes elevating pins that contact a bottom surface of the object when lifting the object during the first and second lifting step and moves up and down with respect to the mounting table to lift the object; and (c) starting supplying a gas between the mounting table and the object from one or more openings opened on the mounting table only after making a gap between the mounting table and the object by lifting the object from the mounting table in step (b).