Patent ID: 8562800

Claim:
A plasma generating apparatus, comprising a plasma generating portion that generates plasma from a target surface by a vacuum arc discharge under a vacuum environment, a plasma advancing path that advances the plasma generated by said plasma generating portion, and a droplet removing portion that removes cathode material particles produced as byproducts from the cathode at the generation time of the plasma while positioned on said plasma advancing path, where said droplet removing portion comprises a plasma advancing tube that is connected to said plasma generating portion, a first plasma advancing tube that is connected in a bent manner to said plasma advancing tube, a second plasma advancing tube that is connected at the end of said first plasma advancing tube so that it is inclinedly arranged at a predetermined bending angle with respect to the tube axis, a third plasma advancing tube that is connected in a bent manner at the finishing end of said second plasma advancing tube so that said plasma is exhausted from a plasma outlet, and the total length L for said plasma to arrive from said target surface to an object to be treated that is set up to satisfy 900 mm≦L≦1350 mm, wherein in a connecting portion between said second plasma advancing tube and said third plasma advancing tube, there are set up a rectification magnetic field generating means that converges and rectifies said plasma that is supplied from said second plasma advancing tube to said third plasma advancing tube in an advancing direction, and a magnetic field coil for scanning is provided to make possible a plasma exposure to a large area and to scan said plasma by oscillating said plasma with different frequencies in left-right and top-bottom directions after said plasma has been converged and rectified.