Patent ID: 6881295
Filing Date: 2005-04-19
Classification: C23C

Abstract:
1. A gas treatment apparatus comprising: an outer tube having gas inlet port connected to a gas supply system receiving gas and a gas outlet port connected to an exhaust pipe, and defining an inner space; a wafer boat provided in said inner space and holding plural wafers spaced from one another in a predetermined direction; an inner tube provided between said wafer boat and said outer tube and elongated in said predetermined direction; and a gas feeder provided between said inner tube and said wafer boat, connected to a said gas inlet port and defining a gas passage gradually reduced in cross section in said predetermined direction, and formed with a plurality of like gas outlet holes equal in open area and equally spaced in said predetermined direction for blowing said gas to said wafers, wherein said gas feeder has a narrow end surface, a wide end surface, a convex outer surface extending between said narrow end surface and said wide end surface, a concave inner surface extending between said narrow end surface and said wide end surface and spaced from said convex outer surface and semi-cylindrical side surfaces connected between one of the side lines of said convex outer surface and one of the side lines of said concave inner surface and between the other of said side lines of said convex outer surface and the other of said side lines of said concave inner surface, and said gas inlet port is connected to said gas feeder at a position closer to said wide end surface than said narrow end surface.