Through-type capacitor and magnetron using same

A through-type capacitor comprising:

• a ground fitment;
• a ceramic dielectric formed on both surfaces thereof with electrodes and fixed through one of said electrodes on said ground fitment;
• an insulation case arranged to surround said ceramic dielectric;
• through-conductors inserted through said ceramic dielectric and electrically connected to the other of said electrodes;
• and
• insulation resin means filled in said insulation case so as to embed said ceramic dielectric therein;
• said insulation case comprising a first insulation case member formed of thermoplastic resin having flexibility and contraction and expansion properties and arranged to surround said ceramic dielectric, and a second insulation case member formed of thermosetting resin having heat resistance, tracking resistance, arc resistance and fire resistance and integrally mounted on said first insulation case member;
• said through-conductors each comprising a rod material and being integrally connected to said fastening tab by caulking.

A magnetron comprising:

• a filter box arranged to enclose a cathode stem having a cathode terminal therewith and including a side wall;
• a through-type capacitor comprising a ground fitment, a ceramic dielectric formed on both surfaces thereof with electrodes and fixed through one of said electrodes on said ground fitment, an insulation case arranged to surround said ceramic dielectric, through-conductors inserted through said ceramic dielectric and electrically connected to the other of said electrodes, and insulation resin means filled in said insulation case so as to embed said ceramic dielectric therein, said insulation case comprising a first insulation case member formed of thermoplastic resin having flexibility and contraction and expansion properties and arranged to surround said ceramic dielectric, and a second insulation case member formed of thermosetting resin having heat resistance, tracking resistance, arc resistance and fire resistance and integrally mounted on said first insulation case member;
• said through-type capacitor being inserted through said side wall of said filter box in a manner to outwardly project said insulation case from said filter box and mounted through said ground fitment on said side wall of said filter box;
• and
• inductors connected in series between said cathode terminal of said cathode stem and said through-conductors.