Patent ID: 7361228
Filing Date: 2008-04-22
Classification: H01J

Abstract:
1. A showerhead, comprising: a plate having a plurality of gas outlet holes extending therethrough; a head cover coupled to the plate to form a space between the plate and the head cover; a gas supply inlet line disposed in the plate that is configured to provide gas to the space directed toward the head cover; and a gas distribution region on an inner face of the head cover facing the space that is configured to partially suppress flow of the gas provided to the space in a direction along the gas distribution region to substantially uniformly distribute the gas in the space, wherein the direction along the gas distribution region comprises a horizontal direction and the gas provided to the space is directed in a substantially vertical upward direction and wherein the gas distribution region comprises a stepped structure providing a height of the space that decreases from a position where the gas is provided to the space to a position in the space displaced therefrom.