Patent ID: 6221160
Filing Date: 2001-04-24
Classification: B05C,Y10S

Abstract:
An apparatus for controlling the environment in a process chamber comprising:an air flow conduit having an inlet, a first outlet and a second outlet, said inlet in fluid communication with an air supply, said first outlet in fluid communication with a cavity of said process chamber and said second outlet in fluid communication with the atmosphere through a throttle valve,an air supply for feeding an air flow of controlled humidity and temperature into said inlet,a pressure sensor for detecting an air pressure in said first outlet and for sending a first signal to a throttle valve controller,a throttle valve controller for receiving said first signal from said pressure sensor to compare said signal to a pre-set pressure value, and to output a second signal to a drive means for adjusting said throttle valve, anda throttle valve for adjusting a volume of air flown into the atmosphere such that an air flow of controlled velocity enters said cavity in the process chamber through said first outlet.