Patent ID: 8191505

Claim:
A plasma processing apparatus for performing a plasma processing on a substrate to be processed, the apparatus comprising: a chamber accommodating therein the substrate to be processed; a plasma generation unit, having a bell jar and an antenna, for producing a plasma inside the bell jar, wherein the bell jar made of a dielectric material is provided above the chamber to communicate therewith and the antenna is coiled around an outer side of the bell jar to generate an induced electric field in the bell jar; a processing gas introducing mechanism, provided between the plasma generation unit and the chamber, for introducing a processing gas for producing a plasma into a processing space formed by the plasma generation unit and the chamber; and a mounting table for mounting the substrate to be processed provided in the chamber, wherein, given that an inner diameter of the bell jar is D and an inside measurement of height in a central portion of the bell jar is H, a flatness K defined by a ratio D/H is in the range of 1.60˜9.25, wherein the plasma processing apparatus further comprises a mask made of a dielectric material, the mask covering the mounting table, wherein the mask has a first region where the substrate to be processed is mounted and a second region surrounding the first region, wherein, in the second region, there are provided plural projections for positioning the substrate to be processed at a position of the first region, the projections being spaced apart from each other, wherein, in the first region, there are provided a number of pin holes through which elevating pins for elevating the substrate to be processed from the mounting table penetrate; and ventilation grooves communicating with the pin holes, and wherein an upper surface of the first region except the ventilation grooves is flush with an upper surface of the second region except the projections.