Patent ID: 7981216

Claim:
A vacuum processing apparatus for processing a substrate using a film deposition process, comprising: a reactor chamber; and a plate having a plurality of through holes configured and positioned to allow passage therethrough and separating the reactor chamber into a plasma generating space where a plasma generating electrode is provided and a substrate process space where a substrate is to be disposed; wherein the film deposition process comprises carrying out on a substrate placed in the substrate process space by delivering a plasma generating gas into the plasma generating space for generating a plasma, producing radicals with the plasma thus generated, and delivering the radicals through the plurality of through-holes in said plate into the substrate process space, wherein said plate comprises: a partitioning body having the plurality of through-holes and a gas diffusion space formed inside the body and communicating with the substrate process space through diffusion holes to diffuse a feeded film deposition gas and flow the diffused film deposition gas into the substrate process space through the diffusion holes but being closed to the plasma generating space so that the feeded film deposition gas to be introduced into the substrate process space does not contact with the radicals until the feeded film deposition gas enters the substrate process space, and a control plate detachably attached to the partitioning body and positioned on the plasma generating space side of the partitioning body; wherein the control plate has radical passage holes in alignment with the plurality of through-holes in the partitioning body, and a diameter of the radical passage holes is smaller than that of a diameter of the through-holes so that the amount of the radicals introduced into the substrate process space is determined by the diameter of radical passage holes in the control plate; wherein the control plate includes a plurality of projections at each of which projections, one of the radical passage holes is formed, wherein each of the projections fits into a respective through-hole so as to define the respective radical passage hole; wherein the radical passage holes have a stepped diameter such that a diameter of the radical passage holes is smaller nearer the plasma generating space than at the substrate process space.