Patent US3916247A successfully refreshed from Google Patents.
US3916247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shell type magnetron device
Assignee: Toshiba Corp
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Filing: 1974-07-10
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Granted: 1975-10-28
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Expires: 1994-07-10
Abstract
Abstract A magnetron device comprising a magnetron body having a cathode stem and an output antenna section respectively provided projectively from both ends of said body, first and second magnets disposed on the magnetron body with the projecting cathode stem and output antenna section respectively inserted into the magnets and a yoke for magnetically connecting the first and second magnets. The first magnet mounted on the cathode stem side bears a substantially parallelepiped form almost as wide as the outer diameter of the magnetron body and the second magnet provided on the output antenna side presents a thin doughnut shape. That side of the yoke which faces the first magnet is made substantially as wide as the end face of the first magnet and the magnetron body is provided with a plurality of radiator plates erected on the magnetron body in a radial direction, each having a plane parallel with the axis of the magnetron body.
Inventors
- 👤 Tokuji Koinuma
- 👤 Kaichiro Nakai
- 👤 Hirosi Ideue
- 👤 Hiromi Komura
- 👤 Kazuhisa Nitta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:24
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/02; H01J23/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
221 words
A magnetron device which comprises a magnetron body having a cathode stem and output antenna section respectively provided on both sides of said magnetron body so as to project outward therefrom; a first ferrite permanent magnet of a parallelpiped shape having a width approximating the diameter of the magnetron body and disposed thereon, with said projecting cathode stem inserted into said first magnet; a second ferrite permanent magnet of a doughnut shape having a volume substantially equal to that of the first magnet and being disposed on the magnetron body with said projecting output antenna stem inserted into said second magnet; two shim plates, each interposed between one end face of the respective magnets and the end face of the magnetron body; a yoke, one member of which is disposed on the first magnet and the other member of which is disposed on the second magnet for magnetic connection of both magnets, the upper wall of said one yoke member abutting against the other end face of the first magnet having a shape substantially equal to the end face of the first magnet; a radiator provided on the peripheral wall of the magnetron body so as to conduct a cooling medium in the axial direction of the magnetron body; and a microwave shield so provided as to enclose the cathode stem.
Claim 2
Dependent Claim
221 words
A magnetron device which comprises a magnetron body having a cathode stem and output antenna section respectively provided on both sides of said magnetron body so as to project outward therefrom; a first ferrite permanent magnet of a parallelpiped shape having a width approximating the diameter of the magnetron body and disposed thereon, with said projecting cathode stem inserted into said first magnet; a second ferrite permanent magnet of a doughnut shape having a volume substantially equal to that of the first magnet and being disposed on the magnetron body with said projecting output antenna stem inserted into said second magnet; two shim plates, each interposed between one end face of the respective magnets and the end face of the magnetron body; a yoke, one member of which is disposed on the first magnet and the other member of which is disposed on the second magnet for magnetic connection of both magnets, the upper wall of said one yoke member abutting against the other end face of the first magnet having a shape substantially equal to the end face of the first magnet; a radiator provided on the peripheral wall of the magnetron body so as to conduct a cooling medium in the axial direction of the magnetron body; and a microwave shield so provided as to enclose the cathode stem.
Claim 3
Dependent Claim
31 words
A magnetron device according to claim 1, wherein the second magnet has a larger diameter than the outer diameter of the magnetron body and is made thinner than the first magnet.
Claim 4
Dependent Claim
29 words
A magnetron device according to claim 1, wherein said shim plates are made of magnetic material and provided with a plurality of small projection for abutment against the magnets.
Claim 5
Dependent Claim
30 words
A magnetron device according to claim 1, wherein a space is provided between the underside of the first magnet and the upper side of the radiator facing said first magnet
Claim 6
Dependent Claim
28 words
A magnetron device according to claiM 1, wherein the first and second magnets are so disposed as to cause the planes of opposite polarity to face each other.
Claim 7
Dependent Claim
29 words
A magnetron device according to claim 1, wherein the radiator comprises a plurality of plates radially erected on the periphery of the magnetron body in the axial direction thereof.
Claim 8
Dependent Claim
62 words
A magnetron device according to claim 1, wherein said first yoke member is formed with a width approximating that of the first magnet and is made thicker than the second yoke member which is formed with a larger surface area than the first yoke member, and said first and second yoke members are coupled to each other to constitute a magnetic circuit.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |