Magnetron for microwave oven
AssigneeToshiba Hokuto Electronics Corporation
InventorMasatoshi Higashi
Life of this patent
Estimating the term…
Abstract
A magnetron for microwave oven has an anode cylinder, vanes (height: H (mm)), a cathode spirally extending along the central axis, a pair of end hats (outer diameter: DEH1 (mm), DEH2 (mm)) fixed to both ends of the cathode, and a pair of pole pieces. Vanes extend from an inner surface of the anode cylinder to the central axis. Free ends of the vanes form a vane inscribing circle (diameter: Da (mm)). Pole pieces expand like funnels from through-holes (inner diameter: DPP1 (mm), DPP2 (mm)) facing to the end hats and pinch the cathode. The shape of the magnetron satisfies, H≦8.5, H/Da≦0.95, DEH1/DPP1≦0.8, DEH1/DPP2≦0.8, DEH2/DPP1≦0.8, DEH2/DPP2≦0.8, 0.92≦Da/DPP1≦0.95, and 0.92≦Da/DPP2≦0.95.
Claims10
A magnetron for microwave oven comprising:
- an anode cylinder extending cylindrically along a central axis;
- a plurality of vanes extending from an inner surface of the anode cylinder to the central axis and free ends thereof forming a vane inscribing circle;
- a spiral cathode extending spirally along at the central axis;
- a pair of end hats fixed to both ends of the cathode;
- and
- a pair of funnel-shaped pole pieces located so as to pinch the cathode upon expanding from a through-hole face to face with each end hat to an end of the anode cylinder,
- wherein H =8.0, H/Da<0.95, DEH1/DPP1<0.8, DEH1/DPP2<0.8, DEH2/DPP1<0.8, DEH2/DPP2<0.8, 0.92<Da/DPP1<0.95, and 0.92<Da/DPP2<0.95, where H (mm) is the height of the vane;
- Da (mm) is the diameter of the vane inscribing circle;
- DEH1 (mm) and DEH2 (mm) are outer diameters of the pair of end hats respectively;
- and DPP1 (mm) and DPP2 (mm) are inner diameters of the through-holes of the pair of pole pieces.
A magnetron for microwave oven comprising:
- an anode cylinder extending cylindrically along a central axis;
- a plurality of vanes extending from an inner surface of the anode cylinder to the central axis and free ends thereof forming a vane inscribing circle;
- a spiral cathode extending spirally along at the central axis;
- a pair of end hats fixed to both ends of the cathode;
- and
- a pair of funnel-shaped pole pieces located so as to pinch the cathode upon expanding from a through-hole face to face with each end hat to an end of the anode cylinder,
- wherein H =8.0, H/Da<0.95, DEH1/DPP1<0.8, DEH1/DPP2<0.8, DEH2/DPP1<0.8, DEH2/DPP2<0.8, 0.92<Da/DPP1<0.95, and 0.92<Da/DPP2<0.95, where H (mm) is the height of the vane;
- Da (mm) is the diameter of the vane inscribing circle;
- DEH1 (mm) and DEH2 (mm) are outer diameters of the pair of end hats respectively;
- and DPP1 (mm) and DPP2 (mm) are inner diameters of the through-holes of the pair of pole pieces, wherein:
- Da=8.7 mm;
- DEH2=7.2 mm;
- and
- DPP1=9.2 mm.
A magnetron for microwave oven comprising:
- an anode cylinder extending cylindrically along a central axis;
- a plurality of vanes extending from an inner surface of the anode cylinder to the central axis and free ends thereof forming a vane inscribing circle;
- a spiral cathode extending spirally along at the central axis;
- a pair of end hats fixed to both ends of the cathode;
- and
- a pair of funnel-shaped pole pieces located so as to pinch the cathode upon expanding from a through-hole face to face with each end hat to an end of the anode cylinder,
- wherein H <8.4, H/Da<0.95, DEH1/DPP1<0.8, DEH1/DPP2<0.8, DEH2 /DPP1<0.8, DEH2/DPP2<0.8, 0.92<Da/DPP1<0.95, and 0.92<Da/DPP2<0.95, where H (mm) is the height of the vane;
- Da (mm) is the diameter of the vane inscribing circle;
- DEH1 (mm) and DEH2 (mm) are outer diameters of the pair of end hats respectively;
- and DPP1 (mm) and DPP2 (mm) are inner diameters of the through-holes of the pair of pole pieces, and wherein DPP1 and DPP2 differ by at least 0.2 (mm).
Dependencies are inferred from the claim text.