| 摘要 |
PROBLEM TO BE SOLVED: To provide a magnetron capable of increasing exhaust conductance without degrading maximum magnetic field intensity nor causing leakage of higher harmonics. SOLUTION: This magnetron is provided with: a cylindrical positive electrode tubular body 10 with both ends opened; a negative electrode structure 12 arranged on the center axis of the positive electrode tubular body 10; a plurality of anode vanes 11 radially arranged around the negative electrode structure 12 through an action space 13, and fixed to an inner wall surface of the positive electrode tubular body 10; and a pair of funnel-like pole pieces 14 and 30 arranged in the openings at both ends of the positive electrode tubular body 10, and each comprising a small-diameter flat part FL1 having a through-hole at the center part, a large-diameter flat part FL2 having a diameter larger than that of the small-diameter flat part FL1, and a conical slant part SL connecting the large-diameter flat part FL2 to the small-diameter flat part FL1. In the input-side pole piece 30 within the pair of pole pieces 14 and 30, three or more, preferably four through-holes 30B each having an area of 16.6 mm<SP>2</SP>are formed on the slant part SL in addition to a through-hole 30A at the center part. COPYRIGHT: (C)2008,JPO&INPIT
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