Patent ID: 6478923
Filing Date: 2002-11-12
Classification: C23C,H01J

Abstract:
A vacuum operation apparatus comprising:a chamber set to a predetermined vacuum pressure in order to operate a wafer; an exhaust device for evacuating said chamber; an exhaust pipe disposed to connect said exhaust device and said chamber; a pressure control orifice disposed in said exhaust pipe to control a pressure in said chamber; a residence time control variable orifice which is disposed in said exhaust pipe so as to open/close independently of said pressure control orifice, and controls a flow rate of gas in said exhaust pipe by controlling the opening degree of said residence time control variable orifice, in order to control a residence time of gas in said chamber; and a control section which has a memory storing in advance an operating condition corresponding to an operation executed in said chamber, and controls driving of said exhaust device and an opening degree of said pressure control orifice.