Patent ID: 9725808
Date: 2017-08-08
CPC Classifications: C23C,Y10T

Claim:
1. A raw material gas supply apparatus for supplying a carrier gas that is an inert gas to a raw material container accommodating a solid or liquid raw material through a carrier gas supply line and intermittently supplying a raw material gas containing a vaporized raw material to a film forming unit while alternately repeating a supply period and a pause period, the apparatus comprising: a mass flow controller for the carrier gas, disposed in the carrier gas supply line and configured to control a flow rate of the carrier gas based on a set value of the flow rate of the carrier gas; a flow rate measurement unit, disposed in a raw material gas supply line that is disposed at an outlet side of the raw material container and configured to measure a flow rate of the raw material gas; a dilution gas supply line coupled to the raw material gas supply line and configured to allow a dilution gas that is the inert gas to be mixed with the raw material gas; a mass flow controller for the dilution gas, disposed in the dilution gas supply line and configured to control a flow rate of the dilution gas based on a set value of the flow rate of the dilution gas; and an operation processing unit configured to obtain a difference between a set value and a measured value of an amount of the vaporized raw material and a correction value based on the difference, add the correction value to the set value of the flow rate of the carrier gas to maintain the measured value of the amount of the vaporized raw material at the set value thereof, and subtract the correction value from the set value of the flow rate of the dilution gas to maintain a total flow rate of the carrier gas and the dilution gas at a constant level, wherein the amount of the vaporized raw material is calculated by subtracting an integration value of a measured value of a flow rate of the inert gas flowing through the flow rate measurement unit in the supply period from an integration value of the flow rate of the raw material gas which is measured by the flow rate measurement unit in the supply period.