Chemistry: electrical and wave energy – Apparatus – Coating – forming or etching by sputtering
Patent
1986-05-01
1987-04-28
Demers, Arthur P.
Chemistry: electrical and wave energy
Apparatus
Coating, forming or etching by sputtering
20419212, 20419215, 376419, C23C 1400
Patent
active
046612335
ABSTRACT:
A sputter coating apparatus target includes an elongated cathode having an upper support surface, sputter target material disposed upon the upper cathode surface, and a ground shield having a box-like construction. The ground shield includes a bottom wall and side walls containing the cathode therein in an enclosed state and an open top defined by the side walls adjacent to the upper cathode surface placing the target material in an exposed state. Also, blocks are provided for supporting the cathode within the shield in a spaced electrically insulated relationship relative to the shield such that a gap is defined between the cathode and the bottom and side walls of the shield. The cathode and ground shield are provided in an improved arrangement which includes the cathode having an upper peripheral edge surrounding its upper support surface and the side walls of the ground shield having upper edges surrounding and spaced outwardly from the upper peripheral edge of the cathode such that the gap between the ground shield and the cathode is exposed from a direction directly facing the open top of the ground shield. The upper edges of the shield side walls are displaced slightly below the upper peripheral edge of the cathode and means in the form of peripheral strips are attached to a retainer seated on the upper peripheral edge of the cathode and extend outwardly therefrom so as to overhang the upper edges of said ground shield side walls and cover exposure of the gap from the direction directly facing the open top of the ground shield. The outwardly extending strips are spaced above the upper edges of the ground shield side walls so as to relocate exposure of the gap from the direction facing the open top of the shield to directions angularly displaced therefrom and facing the side walls of the shield. Also, the gap is filled with a ceramic insulation material.
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Demers Arthur P.
Westinghouse Electric Corp.
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