Patent ID: 6708645
Filing Date: 2004-03-23
Classification: C23C,H01J

Abstract:
An elongated feedthru electric power transfer fitting for conveying high voltage and electric current through a conductive wall of a vacuum deposition chamber comprising:an elongated tubular case having an inner and an outer portion and adapted for rigid connection through, and extending in either direction from, an aperture formed through the wall; an elongated cylindrical conductive central electrode extending coaxially within and beyond each end of said case; a non-conductive cylindrical isolator extending radially between said central electrode and said case, said isolator extending beyond the ends of said case but not to the ends of said central electrode whereby the ends of said central electrode are exposed for electrical engagement at one of said ends with an electric power source exterior to the chamber and at the other of said ends with a support for a conductive plasma rod positioned in the chamber; said inner portion of said case positioned within the chamber and spaced radially outwardly from an outer surface of said isolator a distance defining a first annular gap; a removable protective cap engagable over an outer surface of the inner portion of said case with an inner end portion of said isolator extending though an aperture formed through a bottom of said cap; the outer surface of said isolator and the aperture in said cap bottom defining a second annular gap which is smaller in radial width than that of said first gap, said second gap sufficiently small to prevent vaporized metal in the chamber from passing therethrough to otherwise deposit onto the outer surface of said isolator within said first gap.