Patent ID: 6398929
Filing Date: 2002-06-04
Classification: C23C,H01J,H01L

Abstract:
A pair of shields for use in a plasma sputtering reactor, comprising a first generally circularly symmetric shield and a second generally circularly symmetric shield both referenceable to a common axis:wherein said first shield comprises a first flange portion extending radially outwardly from said axis; a first cylindrical portion extending along said axis for a first length, having a first diameter, and being connected to said first flange portion, a second cylindrical portion extending along said axis for a second length, and having a second diameter smaller than said first diameter, a first transition portion connecting said first and second cylindrical portions, a bowl portion connected to said second cylindrical portion and extending radially of said axis, and a third cylindrical portion extending along said axis for a third length smaller than said second length, having a third diameter smaller than said second diameter, and being connected to said bowl portion; wherein said second shield comprises a second flange portion extending radially outwardly from said axis, a fourth cylindrical portion extending along said axis for a fourth length larger than said first length and having a fourth diameter smaller than said first diameter, a fifth cylindrical portion extending along said axis for a fifth length smaller than said second length and having a fifth diameter smaller than said second diameter and larger than said third diameter, and a second transition portion connecting said fourth and fifth cylindrical portions; and wherein said first and second shields are positionable along said axis to form a convolute channel between (a) said first and fourth cylindrical portions, (b) said first and second transition portions, and (c) said second and fifth cylindrical portions.