Patent ID: 9048070
Filing Date: 2015-06-02
Classification: H01J

Abstract:
1. A dielectric window for a plasma treatment device which is provided in a plasma treatment device using microwaves as a plasma source, wherein the dielectric window for the plasma treatment device is formed in a disk shape and configured to propagate the microwaves, wherein a recess is provided on a bottom surface of the dielectric window, in which the bottom surface becomes a plasma generation side when the dielectric window is provided in the plasma treatment device, an opening of the recess becomes the bottom surface side, and the recess is recessed inwardly in a plate thickness direction of the dielectric window, and wherein the recess is constituted by a base surface which extends in a direction perpendicular to the plate thickness direction of the dielectric window, a side surface which extends in the plate thickness direction of the dielectric window toward the opening side of the recess from a circumferential edge of the base surface, and an inclined surface which extends at an incline with respect to the plate thickness direction of the dielectric window from an opening side circumferential edge of the side surface toward the opening side of the recess.