Patent ID: 6877458

Claim:
An apparatus for forming a deposited film, comprising a discharge vessel in a vacuum vessel, the discharge vessel comprising a parallel flat plate electrode, material gas supply means and material gas exhaust means, having opposing walls at least one of which (i) comprises a substrate on which the film is deposited and is (ii) located in opposition to the parallel flat plate electrode to form a plasma-generating space therebetween, wherein the material gas is introduced into the discharge vessel while exhausting an interior of the discharge vessel and plasma is generated in the space between the parallel flat electrode and the substrate in the discharge vessel, thereby decomposing the material gas to form the deposited film on the substrate, wherein the width of an exhaust port of the material gas exhaust means perpendicular to the longitudinal direction of the substrate is wider than the width of the parallel plate electrode perpendicular to the longitudinal direction of the substrate and the exhaust port faces the space bounded by the parallel plate electrode and the substrate.