Patent ID: 6222319
Filing Date: 2001-04-24
Classification: H01J

Abstract:
A magnetron apparatus comprising:an anode cylinder having a central axis; anda plurality of plate-shaped anode segments radially arranged around the central axis of said anode cylinder, wherein each of said plurality of plate-shaped anode segments includes a first edge, a second edge, a third edge, and a fourth edge, said first edge of each of said anode segments being attached to an inner surface of said anode cylinder in a substantially longitudinal orientation with respect to said anode cylinder so that each said anode segment projects radially inward toward said central axis from said inner surface, said second edge of each of said anode segments opposing said corresponding first edge and being arranged in a substantially longitudinal orientation with respect to said anode cylinder, said third edge of each of said anode segments connecting a first end of said corresponding first edge and a first end of said corresponding second edge, and said fourth edge of each of said anode segments connecting a second end of said corresponding first edge and a second end of said corresponding second edge, wherein said third edge and fourth edge of each of said anode segments include at least one strap ring groove for carrying at least one conductive strap ring, each strap ring groove having a groove depth with respect to a corresponding edge of each said plate-shaped anode segment;wherein said second edge of each of said plurality of plate-shaped anode segments is divided into three portions in a substantially longitudinal direction with respect to said anode cylinder, said three portions of each of said anode segments including a first end portion of each of said anode segments, a second end portion of each of said anode segments, and a central portion of each of said anode segments located between said corresponding first and second end portions, said central portion of each of said anode segments being fully recessed from said first and second end portions of each of said anode segments in a direction toward said corresponding first edge, said central portion of each of said anode segments having a length in a substantially longitudinal direction with respect to said anode cylinder that is based upon a respective groove depth of a corresponding strap ring groove; andfor each of said anode segments, said length of said central portion of said second edge is no greater than a difference between a total length of said corresponding first edge and a sum of the respective groove depths of said corresponding strap ring grooves on said corresponding third and fourth edges.