US3727097A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetrons
Assignee: Teledyne UK Ltd
•
Filing: 1971-07-28
•
Granted: 1973-04-10
•
Expires: 1991-07-28
Abstract
Abstract In a magnetron in which tuning is effected by a movable conductive member adjacent one end face of the anode block whose position is controlled by a piezo-electric transducer inside the envelope of the magnetron the transducer is shielded from the cathode by a layer of glass and/or a metal shield, thus reducing the deterioration of the transducer.
Inventors
- 👤 B Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:31
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/16; H01J23/18; H01J23/20; H01J23/213
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
131 words
In a magnetron of the type included an anode block having an end face and provided with bore and cavity formations opening onto said end face, a cathode in said bore, and said magnetron defining an evacuated region at and surrounding said end face and in communication with said bore and cavity formations to encompass at least that portion of said cathode within said bore, the combination of: a piezo-electric transducer disposed in said evacuated region; a conductive member carried by said piezo-electric transducer for axial movement toward and away from said end face in response to voltage fluctuations applied to said piezo-electric transducer; and means for shielding the piezo-electric material of said transducer, and especially any boundary region between two portions of piezo-electric material forming said transducer, from said cathode.
Claim 2
Dependent Claim
131 words
In a magnetron of the type included an anode block having an end face and provided with bore and cavity formations opening onto said end face, a cathode in said bore, and said magnetron defining an evacuated region at and surrounding said end face and in communication with said bore and cavity formations to encompass at least that portion of said cathode within said bore, the combination of: a piezo-electric transducer disposed in said evacuated region; a conductive member carried by said piezo-electric transducer for axial movement toward and away from said end face in response to voltage fluctuations applied to said piezo-electric transducer; and means for shielding the piezo-electric material of said transducer, and especially any boundary region between two portions of piezo-electric material forming said transducer, from said cathode.
Claim 3
Dependent Claim
25 words
A magnetron as claimed in claim 1 and wherein said means for shielding comprises a screen mounted in front of the transducer facing the cathode.
Claim 4
Dependent Claim
30 words
A magnetron as claimed in claim 1 and wherein said means for shielding comprises a deposit of insulating material on otherwise exposed regions of said piezo-electric material facing the cathode.
Claim 5
Dependent Claim
42 words
A magnetron as claimed in claim 1 and wherein said means for shielding comprises a screen mounted in front of the transducer facing the cathode and a deposit of insulating material on otherwise exposed regions of said piezo-electric material facing the cathode.
Claim 6
Dependent Claim
36 words
A magnetron as claimed in claim 3 and wherein the deposit of insulating material is provided to cover all of the edge surfaces of the piezo-electric transducer so that no region of piezo-electric material is exposed.
Claim 7
Dependent Claim
14 words
A magnetron as claimed in claim 3 and wherein the insulating material is glass.
Claim 8
Dependent Claim
15 words
A magnetron as claimed in claim 6 and wherein said glass is a lead glass.
Claim 9
Dependent Claim
28 words
A magnetron as claimed in claim 7 and having the following mix: Red Lead 440 gm. Boric Oxide 132 gm. Zinc Oxide 30 gm. Aluminum Hydroxide 18 gm.
Claim 10
Dependent Claim
50 words
A magnetron as claimed in claim 1 and wherein the conductive member is mounted on an arm projecting from the end of said piezo-electric transducer which in turn is mounted in cantilever fashion from a relatively maSsive mounting block, said means for shielding comprising a screen carried on said arm.
Claim 11
Dependent Claim
35 words
A magnetron as claimed in claim 9 and wherein a head conductor is connected between said arm and said mounting block in order to conduct away heat absorbed by said screen and said tuning member.
Claim 12
Dependent Claim
27 words
A magnetron as claimed in claim 10 and wherein said arm, tuning member, screen and heat conductor are of copper and said mounting block is of kovar.
Claim 13
Dependent Claim
16 words
A magnetron as claimed in claim 1 and wherein said transducer is of the bimorph type.
Claim 14
Dependent Claim
16 words
A magnetron as claimed in claim 1 and wherein said transducer is of the multimorph type.
References Cited (Backward Citations)
US2752495A
Cited
US3028522A
Cited
US3087124A
Cited
US3334261A
Cited
US3440565A
Cited
US3478246A
Cited
US3478247A
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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) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |