Patent ID: 8988012
Filing Date: 2015-03-24
Classification: H01J

Abstract:
1. A plasma processing apparatus using microwave as a plasma source, the plasma processing apparatus comprising: a dielectric window for the plasma processing apparatus, the dielectric window having a substantially circular plate shape and propagating the microwave, wherein a first dielectric window recess is formed on an outer region of a surface of the dielectric window in a diametrical direction of the dielectric window at a side where plasma is generated when the dielectric window is mounted in the plasma processing apparatus, the first dielectric window recess is extended in a ring shape and has a tapered shape inwardly in a thickness direction of the dielectric window, and the first dielectric window recess includes an inner tapered surface which is inclined in an upward and outward direction of the dielectric window and an outer tapered surface which is inclined in a downward and outward direction of the dielectric window, a plurality of second dielectric window recesses are formed between a center of the dielectric window and the first dielectric window recess, and each of the second dielectric window recesses is recessed inwardly in the thickness direction of the dielectric window from the surface of the dielectric window, and the second dielectric window recesses are arranged at a regular interval in a circumferential direction of the dielectric window to have rotation symmetry about the center of the dielectric window in the diametrical direction thereof.