US3852638A - Dither tuned microwave tube - Google Patents

Dither tuned microwave tube Download PDF

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Publication number
US3852638A
US3852638A US00450964A US45096474A US3852638A US 3852638 A US3852638 A US 3852638A US 00450964 A US00450964 A US 00450964A US 45096474 A US45096474 A US 45096474A US 3852638 A US3852638 A US 3852638A
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US
United States
Prior art keywords
cam
microwave circuit
tuning
cam track
rectilinear translation
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.)
Expired - Lifetime
Application number
US00450964A
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English (en)
Inventor
R Stoke
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.)
Varian Medical Systems Inc
Original Assignee
Varian Associates Inc
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
Priority to US00450964A priority Critical patent/US3852638A/en
Application filed by Varian Associates Inc filed Critical Varian Associates Inc
Publication of US3852638A publication Critical patent/US3852638A/en
Application granted granted Critical
Priority to AU78363/75A priority patent/AU482607B2/en
Priority to CA220,631A priority patent/CA1009369A/en
Priority to DE19752508936 priority patent/DE2508936A1/de
Priority to FR7507261A priority patent/FR2264387B1/fr
Priority to IT21235/75A priority patent/IT1034254B/it
Priority to JP3064575A priority patent/JPS5629334B2/ja
Priority to GB1076575A priority patent/GB1461736A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • H01J23/20—Cavity resonators; Adjustment or tuning thereof
    • H01J23/207—Tuning of single resonator

Definitions

  • ABSTRACT 1 The output frequency of a microwave tube, such as a 1 magnetron, is swept back and forth (dithered) over 315/3951 hfi5g2g3 the tunable range of the tube by means of a motor 58 Field of Search 315/3955, 39.57, 39.59, P l whlch 93'? i f f 315/3961 39.77 trans ation o a tuning mem er Wit in t e tu e.
  • e tuning actuator includes a cam having a clrcular cam [56] R f d track to receive a cam follower.
  • the circular cam e erences le track is scalloped out of the plane of rotation such UNITED STATES PATENTS that, as the cam follower follows the track, reciprocal 3,441,794 4/1969 Chun 3 15/39.6l rectilinear translation is obtained between .the cam fol- 3.44lq795 4/1969 Hynes 315/39.61 lower and the cam. This rectilinear translation is cou- 3,590,313 6/1971 Stoke 315/39.6lfile to the tuning means.
  • the present invention relates in general to frequency agile microwave tubes and more particularly to a mechanically dithered microwave tube, such as a magnetron, of the type wherein a motor driven tuner actuator produces reciprocal rectilinear translation of the tuning member for dither tuning of the tube.
  • the eccentric crankshaft for imparting re-' ciprocal rectilinear translation to the tuning actuator, results in some whipping or flexing of the actuating member in order to accommodate the transverse motion of the eccentriccam when the eccentric is in the transverse plane. It would be desirable to devise a tuning actuator mechanism which does not result in the whipping or flexing action of the tuning actuator member and which results in a lower profile for the tube.
  • the principal objectofth'e present invention is the provision of an improved dither tuned microwave tube and more particularly to an improved actuator for effecting reciprocal rectilinear translation'of the tuning element within the tube.
  • the tuning actuator includes a cam having a circular cam track to re- I ceive a cam follower, the cam track is scalloped in a direction normal to the mean plane of the circular cam track to derive reciprocal rectilinear translation between the cam and cam follower, whereby the rectilinear translation may be coupled to the tuner for dither tuning the tube.
  • the motor i i for driving the dither tuning apparatus is mounted to the microwave tube with the axis of revolution of the drive shaft of the motor being generally parallel to the axis of rectilineartranslation of the tuning structure,
  • the cam follower includes a rotatable cylindrical follower riding on the circular cam track in rolling engagement there ing specification taken in connection with the accompanying drawings wherein:
  • FIG. 1 is a fragmentary view, 'partly in section, of a dither tuned magnetron incorporating features of the present invention
  • FIG. 2 is an enlarged elevational view of the portion of the structure of FIG. 1 delineated by line 2-2, and
  • FIG. 3 is an enlarged sectional view of a portion of the structure of FIG. 1 delineated by line 3-3.
  • Microwave tube 11 is of the type generally described in the aforecited U.S. Pat. No. 3,441,795 and only partially shown herein. It includes a main body portion 22 housing a toroid-shaped cavity resonator 23 coaxially surrounding an array of vane resonators 24 which in-turn surround a cathode emitter 25 to define an annular magnetron interaction region between the vane resonators 24 and the cathode emitter 25.
  • the vane resonators are carried at their outer edges from a cylindrical anode wall 26 forming a common wall of the resonator 23 and the vane resonator system 24.
  • An array of longitudinally directed coupling slots 27 are provided communicating through the commonwall 26 with altematevane resonators for locking'the 1r mode of oscillation of the vane resonator system 24 to the TE circular electric mode in the coaxial cavity 23.
  • the upper end wall 28 of the cavity resonator 23 is axially movable for tuning the resonant frequency of the resonator 23 and thus the frequency of the 11' mode and the output frequency of the tube. Movable end wall 28 is carried from dependent legs 29 of a spider structure 31.
  • the body portion 31 of the spider is an annular disc sealed to the body of the tube via a pairiof axially spaced bellows 32' and 33.
  • the spider 31 is axially translatable via an axially directed actuating rod 34 which is affixed at its lower extremity via a nut to the bottom of a cup-shaped member 35 whichis affixed at its outer periphery to the spider 31.
  • a fixed cylindrical slide linear motion ball bearing assembly 36 is affixed with and wherein the cylindrical follower has an axis of riphery of the cylindrical cam member 38.
  • the recess or cam track 39 is scalloped out of the mean plane of the circular cam track indicated by line 41.
  • the cam track 39 is scalloped out of the mean plane 41 with a sinusoidal variation taken around the periphery of the circular cam track 39.
  • a pair of cam followers 42 are diametrically opposed of the cam 38 and are carried in a ring 43 (See FIGS. 1 and 3) coaxially mounted of the actuating rod 34 and cam 38.
  • the ring 43 is driven by a ring gear 44 affixed to the support ring 43 and meshing with an idler gear 45 which in-turn meshes with a drive gear 46 affixed to the output drive shaft 47 of a motor 48.
  • Radial bearings 49, 50 and 51 are mounted in a housing structure 52 to provide bearing support for the motor drive shaft 47 and idler gear shaft 53, respectively.
  • the housing 52 is fixedly secured to the body 22 of the tube.
  • Thrust ball bearing assemblies 55 and 56 provide thrust bearing support for the cam follower ring 43 relative to the housing 52.
  • the cam follower 42 includes a ball bearing-supported roller bearing 57 carried upon the inner end of a cylindrical shaft 58 which in-turn is carried from the support ring 43.
  • the shafts 58 project radially from the ring 43 toward the actuator rod 34 in diametrically opposed positions in the ring 43.
  • the cam follower bearings 57 ride in the recessed cam track 39.
  • the cam 38 is caused to oscillate or reciprocate in a direction along theaxis of the actuator rod 34 with a displacement corresponding to the peakto-peak displacement A of the center line 40 of the cam track 39 relative to the mean plane 41 of the cam track 39 at twice the rotation frequency of the cam follower 42 around the cam 38.
  • the peak-to-peak displacement of 0.021 inch produces 250MHz frequency shift at the rate of 150Hz.
  • An electrical generator 59 is coupled to the output shaft 47 of the motor 48 for generating an output voltage in synchronism with the frequency deviation of the output frequency of the tube 11 when the motor is operating at rated speed. This voltage is utilized in the receiver of the radar for causing the local oscillator to track the changing frequency of the transmitted output signal derived from the tube 11 being tuned.
  • the motor may be mounted with its drive shaft 47 generally parallel to the tuner actuator rod 34 and parallel to the axis of the tube such that the motor and generator 48 and 59 do not contribute to lengthening of the overall tube structure.
  • the actuator mechanism including the gear train driving the cam follower has a relatively low profile which permits a reduction in the height of the tube or length of the tube needed for the tuner drive mechanism.
  • the height of the housing 52 is reduced to approximately 0.7 inches as contrasted with 1.75 inches as required by the prior art arrangement as exemplified by the aforecited US. Pat. Nos. 3,441,795; 3,414,761 and 3,590,313.
  • the whipping action on the actuator rod is eliminated in the design of the present invention.
  • cathode emitter means for emitting a stream of electrons
  • microwave circuit means disposed adjacent said cathode emitter means in electromagnetic wave energy exchanging relation with the stream of electrons;
  • tuning means for displacing electromagnetic fields of said microwave circuit means for tuning of said microwave circuit means and thus the frequency of the wave energy generated on said microwave circuit means;
  • said tuning means including, a tuning structure movable relative to said microwave circuit for variably displacing fields of said microwave circuit, tuner actuator means coupled to said tuning structure for effecting reciprocal rectilinear translation of said tuning structure, and motor means for imparting rotary motion to said actuator means for actuation thereof;
  • said tuner'actuator means including cam means having a circular cam track to receive a cam follower means, said circular cam track being scalloped in a direction normal to the mean plane of the circular cam track, and cam follower means following said circular scalloped cam track to derive reciprocal rectilinear translation of one of said cam means relative to said microwave circuit means, and means for coupling said reciprocating one of said cam means to said tuning structure to effect reciprocal rectilinear translation thereof.
  • said motor means includes a rotatable drive shaft, and wherein the axis of revolution of said drive shaft is generally parallel to the axis of rectilinear translation of saidtuning structure.
  • cam follower means includes a rotatable cylindrical follower member riding on said cam track in rolling engagement therewith and having an axis of revolution radially directed of said circular cam track.

Landscapes

  • Microwave Tubes (AREA)
  • Gears, Cams (AREA)
  • Transmission Devices (AREA)
US00450964A 1974-03-14 1974-03-14 Dither tuned microwave tube Expired - Lifetime US3852638A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
US00450964A US3852638A (en) 1974-03-14 1974-03-14 Dither tuned microwave tube
AU78363/75A AU482607B2 (en) 1974-03-14 1975-02-19 Dither tuned microwave tube
CA220,631A CA1009369A (en) 1974-03-14 1975-02-24 Dither tuned microwave tube
DE19752508936 DE2508936A1 (de) 1974-03-14 1975-03-01 Mikrowellenroehre mit zitterabstimmung
FR7507261A FR2264387B1 (de) 1974-03-14 1975-03-07
JP3064575A JPS5629334B2 (de) 1974-03-14 1975-03-13
IT21235/75A IT1034254B (it) 1974-03-14 1975-03-13 Alvola per microonde con sinto nizzazione a traslazione rettili nea alternativa
GB1076575A GB1461736A (en) 1974-03-14 1975-03-14 Dither tuned microwave tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00450964A US3852638A (en) 1974-03-14 1974-03-14 Dither tuned microwave tube

Publications (1)

Publication Number Publication Date
US3852638A true US3852638A (en) 1974-12-03

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ID=23790241

Family Applications (1)

Application Number Title Priority Date Filing Date
US00450964A Expired - Lifetime US3852638A (en) 1974-03-14 1974-03-14 Dither tuned microwave tube

Country Status (6)

Country Link
US (1) US3852638A (de)
JP (1) JPS5629334B2 (de)
CA (1) CA1009369A (de)
DE (1) DE2508936A1 (de)
FR (1) FR2264387B1 (de)
IT (1) IT1034254B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4234855A (en) * 1978-02-02 1980-11-18 Societa Italiana Telecomunicazioni Siemens S.P.A. System for linearly tuning a microwave oscillator
US4247828A (en) * 1978-07-03 1981-01-27 Societa Italiana Telecomunicazioni Siemens S.P.A. Reciprocating piston tuning mechanism for a microwave oscillator
DE3336997A1 (de) * 1982-10-19 1984-04-19 Varian Associates, Inc., 94303 Palo Alto, Calif. Geraet mit resonanzhohlraum, insbesondere frequenzbewegliches magnetron, mit hoehenkompensation
US20050107735A1 (en) * 1998-10-15 2005-05-19 Scimed Life Systems, Inc. Treating urinary retention

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61146855U (de) * 1986-02-13 1986-09-10
JPS64734U (de) * 1987-06-20 1989-01-05
JPH0518504Y2 (de) * 1987-09-30 1993-05-17

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3441794A (en) * 1966-06-15 1969-04-29 Varian Associates Dither-tuned tunable microwave tube apparatus
US3441795A (en) * 1966-06-24 1969-04-29 Sfd Lab Inc Ditherable and tunable microwave tube having a dithered tuner actuator of fixed length
US3590313A (en) * 1970-01-22 1971-06-29 Varian Associates Dither tuned microwave tube with corrected tuner resolver output
US3731137A (en) * 1972-02-03 1973-05-01 Raytheon Co Coaxial magnetron

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1427742A (fr) * 1964-11-13 1966-02-11 Roannais Constr Textiles Dispositif de came et de galet

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3441794A (en) * 1966-06-15 1969-04-29 Varian Associates Dither-tuned tunable microwave tube apparatus
US3441795A (en) * 1966-06-24 1969-04-29 Sfd Lab Inc Ditherable and tunable microwave tube having a dithered tuner actuator of fixed length
US3590313A (en) * 1970-01-22 1971-06-29 Varian Associates Dither tuned microwave tube with corrected tuner resolver output
US3731137A (en) * 1972-02-03 1973-05-01 Raytheon Co Coaxial magnetron

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4234855A (en) * 1978-02-02 1980-11-18 Societa Italiana Telecomunicazioni Siemens S.P.A. System for linearly tuning a microwave oscillator
US4247828A (en) * 1978-07-03 1981-01-27 Societa Italiana Telecomunicazioni Siemens S.P.A. Reciprocating piston tuning mechanism for a microwave oscillator
DE3336997A1 (de) * 1982-10-19 1984-04-19 Varian Associates, Inc., 94303 Palo Alto, Calif. Geraet mit resonanzhohlraum, insbesondere frequenzbewegliches magnetron, mit hoehenkompensation
US4527094A (en) * 1982-10-19 1985-07-02 Varian Associates, Inc. Altitude compensation for frequency agile magnetron
US20050107735A1 (en) * 1998-10-15 2005-05-19 Scimed Life Systems, Inc. Treating urinary retention

Also Published As

Publication number Publication date
CA1009369A (en) 1977-04-26
FR2264387A1 (de) 1975-10-10
FR2264387B1 (de) 1980-05-09
DE2508936A1 (de) 1975-09-18
IT1034254B (it) 1979-09-10
AU7836375A (en) 1976-08-19
JPS5629334B2 (de) 1981-07-08
JPS50128455A (de) 1975-10-09

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