EP0421716A2 - Magnetronanode und deren Herstellung - Google Patents

Magnetronanode und deren Herstellung Download PDF

Info

Publication number
EP0421716A2
EP0421716A2 EP90310750A EP90310750A EP0421716A2 EP 0421716 A2 EP0421716 A2 EP 0421716A2 EP 90310750 A EP90310750 A EP 90310750A EP 90310750 A EP90310750 A EP 90310750A EP 0421716 A2 EP0421716 A2 EP 0421716A2
Authority
EP
European Patent Office
Prior art keywords
anode
vanes
grooves
groove
blank
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP90310750A
Other languages
English (en)
French (fr)
Other versions
EP0421716A3 (en
Inventor
David Bernard Fox
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Teledyne UK Ltd
Original Assignee
EEV Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by EEV Ltd filed Critical EEV Ltd
Publication of EP0421716A2 publication Critical patent/EP0421716A2/de
Publication of EP0421716A3 publication Critical patent/EP0421716A3/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
    • H01J23/16—Circuit elements, having distributed capacitance and inductance, structurally associated with the tube and interacting with the discharge
    • H01J23/165—Manufacturing processes or apparatus therefore
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
    • H01J23/16—Circuit elements, having distributed capacitance and inductance, structurally associated with the tube and interacting with the discharge
    • H01J23/18—Resonators
    • H01J23/22—Connections between resonators, e.g. strapping for connecting resonators of a magnetron

Definitions

  • This invention relates to an anode for a magnetron and to a method of manufacturing such an anode.
  • an anode structure surrounds the cathode and comprises a plurality of radially extending vanes brazed to a surrounding cylinder.
  • the vanes are often connected by straps in such a manner that every other vane is connected together.
  • two radially spaced straps are provided, one connecting even vanes and the other connecting the odd vanes.
  • magnetrons With magnetrons, the lower the frequency, the larger is the magnetron itself. However, as magnetrons are designed to cope with higher and higher frequencies, they become, of necessity smaller and smaller. At frequencies above 20GHz, manufacturing difficulties become severe and, because of the small dimensions used and the high accuracy required, it is frequently difficult if not impossible to manufacture strapped anodes, particularly where mass production is involved.
  • the present invention seeks to provide a strapped anode for a high frequency magnetron which is reproducible on a mass production scale and to provide a method of producing such an anode.
  • an anode for a magnetron comprising a cylinder having a plurality of vanes extending radially inwardly therefrom, the vanes having at least two slots formed by substantially circular grooves with groove centres at substantially the same radius and at least two straps located one in each of the grooves.
  • the grooves may lie one within the other in a stepped formation or may lie on opposite sides of the vanes. Where the grooves are nested in a stepped configuration, there must be suuficient steps to ensure that one of the straps is in electrical contact with a vane and the other, or others, are electrically isolated therefrom. Thus, where two straps are employed there are effectively three grooves, one within the other, to ensure that one strap is properly spaced from the vane and the other strap.
  • the straps may be provided with projections at a circumferential spacing equivalent to twice the circumferential spacing of the vanes, contact with the vanes being made through the projections.
  • At least one of the straps has projections extending inwardly and projections extending outwardly, giving a good thermal conduction path from the interior to the exterior of the magnetron.
  • all the projections could be inwardly extensive or could be outwardly extensive.
  • a method of manufacturing an anode for a magnetron comprising the steps of producing an annular groove in one of the end faces of a cylindrical anode blank, forming vanes in the anode blank such that they lie extending radially inwardly from an annulus formed by the remainder of the blank and such that the groove is located towards the free ends of the vanes, and locating a strap in the groove so that it makes contact with a plurality of vanes.
  • an anode for a magnetron comprising the steps of producing at least two annular grooves at substantially the same radius in one or both end faces of a cylindrical anode blank, forming vanes in the anode blank such that they lie extending radially inwardly from an annulus formed by the remainder of the blank and such that the grooves are located towards the free ends of the vanes, and locating at least two straps in the grooves so that they make contact with alternate vanes.
  • the grooves may be formed as a single stepped groove in which the outer portion forms a first groove and has a first strap therein while the inner portion forms a second groove with a second strap therein lying directly beneath the first strap and electrically isolated from it.
  • the grooves may be formed in opposite end faces of the blank, one strap being located in each of the grooves.
  • a combination of these arrangements may be provided in that the stepped groove may be provided at both ends allowing the provision of four straps or the stepped groove may be provided at one end while a single groove is provided at the other end, thus allowing the provision of three straps.
  • the grooves may be produced by machining, pressing or other suitable techniques while the vanes may be cut out from the blank by spark erosion methods.
  • the first step in making an anode in accordance with a first embodiment of the invention comprises taking a cylindrical copper blank 1 having a centre bore 3 therein and machining an annular multiple groove 5 therein.
  • the groove 5 could be said to consist of three grooves 7, 9 and 11 nested together for a purpose to be described.
  • the groove has a uniform profile throughout its length and is continuous.
  • the anode blank 1 is then further machined by means of a spark erosion technique so that it produces a number of radially inwardly extending vanes 15, as can be seen from Figure 2, by removing the material of the blank 1 between the vanes. Because of the groove 5 cut into the original blank, each vane 15 will have a slot 17 of identical shape, these slots being all that is left of the groove 5.
  • Both straps comprise an annulus 20 with a number of radial projections 21 extending both inwardly and outwardly in pairs. Each pair is spaced angularly by an angle which is equal to twice the angle ⁇ between individual vanes 15. The projections one strap extend radially further than the projections on the other strap for a reason which will be described hereafter.
  • both straps 19 and 23 are placed in the slots 17 in the vanes, the strap 19 with the larger projections being placed on top of the strap 23 with the smaller projections.
  • Each strap 19 or 23 connects together alternate vanes and for this purpose it is necessary for the projections 21 to be seated in the appropriate part of the slot 17.
  • Figure 5 shows the upper strap 19 with its projections 21 taking up the top step 25 of the slot 17 while
  • Figure 6 shows the lower strap 23 with its projections 21 taking up the second step 27 of the slot 17.
  • the projections 21 of one strap will be offset by the angle ⁇ from the projections 21 on the other strap.
  • Each strap 19 and 23 is bonded to the walls of the slot 17 so as to provide a good thermal conduction across the strap.
  • the vanes could be produced first and, provided that the vanes were provided with sufficient support, the grooves could be then cut into the formed vanes.
  • FIG. 7 shows, in section, a vane of an anode in which a single strap 19 is placed in a slot 29 in one edge of the vane 15 while the second strap 23, which in this case is identical to the first strap 19, is placed in a slot 31 at the other edge of the vane 15.
  • Figure 8 shows an anode which has two straps in each of two slots 33 and 35. Thus the straps 19 and 23 are positioned in the upper slot 33 while the other two straps 37 and 39 are positioned in the lower slot 35.
  • Figure 9 which has a double strap slot 41 at one edge and a single strap slot 43 at the other edge.
  • three straps 19, 23 and 37 are used.
  • more than two straps may be provided on both sides of the anode, but for practical purposes, three would normally be the limit. Equally, a single strap could be used on only one side of the anode.
  • Figure 10 shows a possible variation of the strap construction.
  • the strap 47 is configured to have a serpentine shape such that, when inserted into the slots 17 of the vanes it connects with one set of vanes and misses adjacent vanes.
  • the initial groove 5 could be machined with a non uniform profile along its length. Then, when the vanes are formed, alternate vanes will have parts of the groove with different profiles. This enables an anode strap to be used which has a uniform cross section throughout its entire length.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Microwave Tubes (AREA)
EP19900310750 1989-10-02 1990-10-01 Anode for a magnetron and method of manufacturing such an anode Withdrawn EP0421716A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8922144 1989-10-02
GB898922144A GB8922144D0 (en) 1989-10-02 1989-10-02 Magnetrons

Publications (2)

Publication Number Publication Date
EP0421716A2 true EP0421716A2 (de) 1991-04-10
EP0421716A3 EP0421716A3 (en) 1991-08-14

Family

ID=10663915

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900310750 Withdrawn EP0421716A3 (en) 1989-10-02 1990-10-01 Anode for a magnetron and method of manufacturing such an anode

Country Status (2)

Country Link
EP (1) EP0421716A3 (de)
GB (2) GB8922144D0 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6339294B1 (en) 1997-11-07 2002-01-15 Eev Limited Magnetron anode vanes having a face portion oriented towards the anode center
GB2601478A (en) * 2020-11-26 2022-06-08 Teledyne Uk Ltd Magnetron

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5483123A (en) * 1993-04-30 1996-01-09 Litton Systems, Inc. High impedance anode structure for injection locked magnetron

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB626255A (en) * 1943-06-12 1949-07-12 Sylvania Electric Prod Ultra high frequency generator of the magnetron type
US2852720A (en) * 1953-08-12 1958-09-16 Litton Industries Inc Frequency stable magnetron
FR1391842A (fr) * 1962-11-21 1965-03-12 Lignes Telegraph Telephon Perfectionnements aux structures anodiques et magnétrons
JPS5115514B2 (de) * 1971-11-22 1976-05-17
GB2087143B (en) * 1980-11-10 1984-07-18 M O Valve Co Ltd Magnetrons
JPH07109752B2 (ja) * 1985-03-20 1995-11-22 株式会社日立製作所 マグネトロン
DE3673587D1 (de) * 1985-09-09 1990-09-27 Toshiba Kawasaki Kk Magnetronanode und deren herstellung.
JPS6366824A (ja) * 1986-09-08 1988-03-25 Toshiba Corp 電子レンジ用マグネトロン
US5146136A (en) * 1988-12-19 1992-09-08 Hitachi, Ltd. Magnetron having identically shaped strap rings separated by a gap and connecting alternate anode vane groups

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6339294B1 (en) 1997-11-07 2002-01-15 Eev Limited Magnetron anode vanes having a face portion oriented towards the anode center
GB2601478A (en) * 2020-11-26 2022-06-08 Teledyne Uk Ltd Magnetron

Also Published As

Publication number Publication date
GB9021396D0 (en) 1990-11-14
EP0421716A3 (en) 1991-08-14
GB2238422A (en) 1991-05-29
GB8922144D0 (en) 1989-11-15

Similar Documents

Publication Publication Date Title
US5146136A (en) Magnetron having identically shaped strap rings separated by a gap and connecting alternate anode vane groups
HUP0101392A2 (hu) Páros retesz nem forgatott, lemezelt vasmag lemezeléséhez
EP1027764B1 (de) Verbessertes läuferblechpaket
EP0211666B1 (de) Stegleitung mit versetzter Doppelkopplung
US2944171A (en) Intermediate ring squirrel cage rotor
EP0421716A2 (de) Magnetronanode und deren Herstellung
US3423632A (en) Electron discharge device construction
US3914861A (en) Corrugated microwave horns and the like
EP0193079B1 (de) Verfahren zur Herstellung elektromagnetischer Elemente
JPH104312A (ja) 連続する横断方向スタブアンテナアレイの位相同調技術
US3608167A (en) Method for fabricating a "rising sun" magnetron anode
EP1249030B1 (de) Magnetron-anoden
US3900946A (en) Method for making arc extinguishing chamber
US5061878A (en) Magnetron anode and method of manufacturing anode
GB2237140A (en) Magnetrons
US3136027A (en) Discharge device
JPS61214328A (ja) マグネトロン
US990964A (en) Induction-motor.
JPH0817354A (ja) マグネトロンの陽極構体
EP1139485B1 (de) Vorrichtung zur thermischen Kompensation für Mikrowellenfilter
GB2207549A (en) Magnetrons
CN118511424A (zh) 包括自由截面导体的旋转电机的转子
GB2206991A (en) Strapped vane-type magnetron
JPS63244544A (ja) マグネトロンの陽極構造及びその製造方法
GB2088142A (en) Small diameter slip ring assemblies

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE FR

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE FR

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19920215