Patent ID: 6017395
Filing Date: 2000-01-25
Classification: C23C

Abstract:
A vapor deposition apparatus comprising:(a) a plurality of gas sources;(b) a first gas feed line which is in fluid communication with said gas sources and through which a principal carrier gas necessary for conducting vapor deposition is introduced into a reaction pipe;(c) a second gas feed line which is in fluid communication with said gas sources and through which a secondary carrier gas unnecessary for conducting vapor deposition is exhausted;(d) detector means for detecting a difference A in pressure between said first and second gas feed lines, said detector means being disposed upstream of inlet ports at which gases are supplied to said first and second gas feed lines from said gas sources;(e) means for calculating and storing a difference B in pressure between said first and second gas feed lines measured at a location where said detector means is disposed, which difference B in pressure between said first and second gas feed lines would cause said difference A in pressure measured at said inlet ports to be reduced to a desirable range; and(f) a pressure regulator disposed on one of said first and second gas feed lines for regulating a pressure in one of said first and second gas feed lines in accordance with said calculated and stored difference B in pressure between said first and second gas feed lines, thereby preventing suction and discharge of source gases between the first and second gas feed lines, when supply of source gases is switched between the first and second gas lines.