Method for making magnetrons

A method for making magnetrons including, said magnetrons comprising:

• an anode cylinder;
• a plurality of vanes arranged radially within said anode cylinder;
• a magnetic piece disposed at an open end section of said anode cylinder;
• an anode vacuum container including a metal container disposed to cover an upper surface of said magnetic piece;
• a cathode disposed along a central axis of said vacuum container;
• and
• an antenna externally discharging microwaves;
• said method having steps comprising:
• placing said magnetic piece and said metal container, in that order, on a shelf formed inwardly on a thin end section projecting from said open end section of said anode cylinder;
• and
• forming a substantially ring-shaped projection, projecting inwardly from said thin end section of said anode cylinder, whereby said metal container is loosely secured;
• and
• tightly welding said thin end section with said metal container.

A method for making a magnetron wherein said magnetron comprises:

• an anode cylinder;
• a plurality of vanes arranged radially within said anode cylinder;
• a magnetic piece disposed at an open end section of said anode cylinder;
• an anode vacuum container, including a metal container covering an upper surface of said magnetic piece;
• a cathode disposed along a central axis of said vacuum container;
• and
• an antenna externally discharging microwaves;
• said method having steps comprising:
• bending inward an outer perimeter of said metal container to form an outer perimeter bend for covering a substantial section of end portions of said magnetic piece;
• placing said magnetic piece and said metal container, in that order, on a shelf formed inwardly on a thin end section projecting from said open end section of said anode cylinder;
• forming a predetermined number of projections projecting inwardly from said thin end section of said anode cylinder before said metal container is installed;
• loosely securing said metal container by pushing said outer perimeter bend of said metal container into said predetermined number of projections;
• and
• tightly welding said thin end section with said metal container.

A method for making magnetrons including, said magnetrons comprising:

• an anode cylinder;
• a plurality of vanes arranged radially within said anode cylinder;
• a magnetic piece disposed at an open end section of said anode cylinder;
• an anode vacuum container including a metal container disposed to cover an upper surface of said magnetic piece;
• a cathode disposed along a central axis of said vacuum container;
• and
• an antenna externally discharging microwaves;
• said method having steps comprising:
• bending inward an outer perimeter of said metal container to form an outer perimeter bend for covering a substantial section of end portions of said magnetic piece;
• placing said magnetic piece and said metal container, in that order, on a shelf formed inwardly on a thin end section projecting from said open end section of said anode cylinder;
• and
• forming a substantially ring-shaped projection before said metal container is installed, projecting inwardly from said thin end section of said anode cylinder;
• loosely securing said metal container by pushing said outer perimeter bend of said metal container into said ring-shaped projection;
• and
• tightly welding said thin end section with said metal container.