US3876903A - Dither tuned microwave tube - Google Patents

Dither tuned microwave tube Download PDF

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Publication number
US3876903A
US3876903A US453743A US45374374A US3876903A US 3876903 A US3876903 A US 3876903A US 453743 A US453743 A US 453743A US 45374374 A US45374374 A US 45374374A US 3876903 A US3876903 A US 3876903A
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United States
Prior art keywords
cam
cam follower
rail
microwave circuit
rectilinear translation
Prior art date
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Expired - Lifetime
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US453743A
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English (en)
Inventor
Melvin Landau
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
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Filing date
Publication date
Application filed by Varian Associates Inc filed Critical Varian Associates Inc
Priority to US453743A priority Critical patent/US3876903A/en
Priority to GB1076575A priority patent/GB1461736A/en
Priority to JP3249475A priority patent/JPS574055B2/ja
Priority to DE19752512624 priority patent/DE2512624A1/de
Priority to FR7508915A priority patent/FR2265173B2/fr
Application granted granted Critical
Publication of US3876903A publication Critical patent/US3876903A/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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/19—Gearing
    • Y10T74/1954—Eccentric driving shaft and axle

Definitions

  • a mechanically actuated tuner of a microwave tube such as a coaxial magnetron, is driven into reciprocal rectilinear translation relative to the microwave circuit for tuning thereof at a relatively high rate, as of 200Hz, over a relatively wide band of frequencies, as of 250MHz.
  • the tuner is driven via a motorized tuner actuator assembly including a circular rail cam having a scalloped rail on which a pair of followers ride for converting circular motion of one of the members into the reciprocal rectilinear translation of the other which is coupled to the tuning structure.
  • a motorized tuner actuator assembly including a circular rail cam having a scalloped rail on which a pair of followers ride for converting circular motion of one of the members into the reciprocal rectilinear translation of the other which is coupled to the tuning structure.
  • the present invention relates in general to dither tuned tubes and, more particularly, to an improved tuner actuator structure employing a circular rail cam and a pair of cam followers riding thereon for converting rotary motion to reciprocal rectilinear translation of the tuner.
  • the present invention is an improvement on the invention of copending US. application of R. C. Stoke, Ser. No. 450,964, filed 14 Mar. 1974, now US. Pat. No. 3,852,638, issued 3 Dec. 1974, and assigned to the same assignee as the present invention.
  • the original application discloses and claims a circular cam track with cam follower means riding thereon for converting rotary motion into reciprocal rectilinear translation for actuation of a tuner of a dither tuned microwave tube, such as a coaxial magnetron.
  • coaxial magnetrons have been dither tuned by means of a tuner actuating mechanism adapted and arranged for converting rotary motion of a motor into reciprocal rectilinear translation of a tuning structure adjacent the microwave circuit ofa coaxial magnetron for tuning thereof.
  • Tuners of this type are disclosed and claimed in US. Pat. No. 3,414,761, issued Dec. 3, 1968; US. Pat. No. 3,441,795, issued Apr. 29, 1969; and US. Pat. No. 3,590,313, issued- June 29. 1971, all assigned to the same assignee as the present invention.
  • These prior tubes utilized an eccentric crankshaft driven by an electric motor for cranking the tuning structure to and fro (dithering same) adjacent the microwave circuit of the tube for dither tuning thereof.
  • the principal object of the present invention is the provision of an improved dither tuned microwave tube.
  • rotary motion of a drive motor is converted into reciprocal rectilinear translation of a tuning structure of a microwave tube by means of an actuator mechanism including a scalloped circular cam rail having a pair of cam followers riding on opposite sides of the scalloped rail, whereby rotary motion of one of said cam and cam follower members is converted into reciprocal rectilinear translation of the other which is then coupled to the tuning structure.
  • the cam rail is rotated and captured against axial translation, whereas the cam followers are affixed to the tuning structure for effecting reciprocal rectilinear translation of the tuning structure in response to rotation of the rail cam.
  • the follower means are adjustable in the axial direction of the circular rail cam so as to permit an adjustment which avoids play between the rail cam and the followers which ride in rolling engagement with the circular rail cam track.
  • FIG. 1 is a fragmentary longitudinal sectional view of a coaxial magnetron incorporating a tuner of the present invention
  • FIG. 2 is an enlarged detail view of a portion of the structure of FIG. 1 delineated by line 2-2, and
  • FIGS. 3 is an enlarged detail view similar to that of FIG. 2 depicting an alternative embodiment of the present invention.
  • 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 common wall 26 with alternate vane resonators for locking the 7r 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 'n' 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 pair of axially spaced bellows represented by broken lines 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 which is affixed at its outer periphery to the spider 31.
  • a fixed cylindrical slide linear motion ball bearing assembly 36 is affixed to the body of the tube at 37 for guiding and supporting the axially translatable actuating rod 34.
  • a motor 38 drives the tuner actuating rod 34 in a reciprocal rectilinear manner axially of the rod 34 via a suitable gear train assembly 39 and cam arrangement 41 (FIG. 2).
  • the cam arrangement 41 serves to convert the rotary motion of the motor driven gear train 39 into reciprocal rectilinear translation of the tuner actuating rod 34.
  • the cam arrangement 41 includes a disc-shaped rail cam 42 which has, at its outer periphery, circular rail cam track which is scalloped out of the mean plane of the circular cam track in a desired manner such as in a sinusoidal deviation taken around the perimeter of the rail cam 42.
  • the rail cam has two periods of sinusoidal deviation taken around the perimeter thereof with the peakto-peak deviation A of the center line 40 of the cam rail from the mean plane 30 of the cam rail comprising, for example, 0.021 inch.
  • a pair of cam followers 43 ride at the outer periphery of the cam rail 42 on opposite sides thereof in a mutually opposed relation.
  • the cam followers are fixedly coupled to the outer end of the tuner actuating rod 34, as by set screws 44.
  • Each of the cam followers 43 includes a cylindrical cam follower 45 riding in rolling engagement with the opposite sides of the cam rail 42 and being affixed to the tuner drive shaft 34 via a pair of cam follower axles 46 which are radially directed of the circular cam rail 42.
  • Radial ball bearing assemblies 47 are provided between the cylindrical followers 45 and the axle 46.
  • the cam rail 42 is fixedly carried from a shaft 48 which in-turn is supported at its ends in thrust bearing assemblies 49 which are mounted in a gear plate 51 and in an opposed mounting plate 52.
  • the mounting plate 52 is affixed to the end of the tube body 22 via suitable mounting screws, not shown.
  • the gear plate 51 is supported from the mounting plate 52 via a pluality of standoff spacers 53 (FIG. 1).
  • the gear train 39 includes a first drive gear 54 affixed to the end of the drive shaft 55 of the motor 38 via a set screw 56.
  • the first drive gear 54 drives a first idler gear 57 which in-turn drives a second idler gear 58 which drives a gear 59 fixedly secured to the drive shaft 48 of the rail cam 42.
  • a housing 61 is fixedly secured to the mounting plate and covers the gear train 39 and cam assembly 41.
  • An electrical generator 62 is coupled to the other end of the drive shaft 55 of the motor 38 for generating a time varying electrical output in synchronism with the reciprocal translation of the tuner shaft 34. This output, at rated speed of the motor 38, tracks the motion of the tuner to derive an electrical output for tuning the local oscillator of a receiver which is to receive the returned echoes of the transmitted signal transmitted by the tube 11.
  • 250MHz tuning range is obtained at a rate of 200Hz with a peak-to-peak displacement of the tuning ring 28 of 0.021 inch.
  • the tuning actuating rod 34 is captured against rotation by bellows 32 and 33 which allow axial translation of the rod 34 without turning thereof.
  • FIG. 3 there is shown an alternative embodiment of the cam arrangement 41 of FIGS. 1 and 2. More particularly, in this embodiment, the cam followers 43 are captured against axial translation, whereas the circular and scalloped cam rail 42 is fixedly secured to the tuning shaft 34 via a set screw 65 passing through a threaded hole in a collar portion 66 of the cam rail 42.
  • the cam followers 43 have their axles 46 fixedly secured to axially spaced rings 67 and 68 in diametrically opposed positions in respective ones of the rings 67 and 68.
  • the rings 67 and 68 are ax ially splined to a drive gear 69 which surrounds the cam follower rings 67 and 68.
  • a set screw 71 fixedly secures the axial position of the lower cam follower ring 68 relative to the drive gear 69.
  • Thrust bearings 72 are provided between the rings 67 and 68 and the lower mounting plate 52 and a threaded plug portion 73 of the upper gear plate 51.
  • the cam system 41 is loaded by first positioning the lower follower ring 68.
  • the cam rail 42 is then brought into bearing engagement with the upper surfaces of the cylindrical followers for loading the lower follower ring and then the cam rail 42 is fixedly secured to the tuner actuating rod 34 in this position by tightening set screw 65 in the collar 66 of the cam rail 42.
  • the drive gear 69 is fixedly secured to the lower cam follower ring 68 by tightening one or more set screws 71.
  • the upper cam follower ring 67 is brought into engagement with the upper surface of the cam rail 42 and the threaded plug 73 is tightened down on the assembly to assure firm bearing engagement between the upper cam followers 45, the upper surface of the rail cam 42.
  • cathode emitter means for emitting a stream of electrons; microwave circuit means disposed in electromagnetic wave energy exchanging relation with the stream of electrons; means for applying an anode potential to said microwave circuit means relative to said cathode means for drawing the stream of electrons from said cathode means toward said microwave circuit means and for generating wave energy on said microwave circuit means as a result of electromagnetic wave interaction with said 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, said tuning'means including, a tuning structure movable relative to said microwave circuit for variably displacing fields of said microwave circuit means, 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 rail to receive cam follower means, said circular cam
  • 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 said tuning structure.
  • cam follower means includes a pair of rotatable cylindrical follower members riding on opposite sides of said cam rail in rolling engagement therewith and each having an axis of revolution radially directed of said circular cam rail.

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  • Microwave Tubes (AREA)
  • Transmission Devices (AREA)
US453743A 1974-03-14 1974-03-22 Dither tuned microwave tube Expired - Lifetime US3876903A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US453743A US3876903A (en) 1974-03-22 1974-03-22 Dither tuned microwave tube
GB1076575A GB1461736A (en) 1974-03-14 1975-03-14 Dither tuned microwave tube
JP3249475A JPS574055B2 (no) 1974-03-22 1975-03-19
DE19752512624 DE2512624A1 (de) 1974-03-22 1975-03-21 Mikrowellenroehre mit zitterabstimmung
FR7508915A FR2265173B2 (no) 1974-03-22 1975-03-21

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US453743A US3876903A (en) 1974-03-22 1974-03-22 Dither tuned microwave tube

Publications (1)

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US3876903A true US3876903A (en) 1975-04-08

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US453743A Expired - Lifetime US3876903A (en) 1974-03-14 1974-03-22 Dither tuned microwave tube

Country Status (4)

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US (1) US3876903A (no)
JP (1) JPS574055B2 (no)
DE (1) DE2512624A1 (no)
FR (1) FR2265173B2 (no)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0012034A1 (en) * 1978-12-05 1980-06-11 English Electric Valve Company Limited Variable frequency magnetron
US4613788A (en) * 1983-04-29 1986-09-23 U.S. Philips Corporation Arrangement in a tunable high frequency transmitter tube
US5449972A (en) * 1993-07-30 1995-09-12 Litton Systems, Inc. Low-torque magnetron tuning device
US10132661B2 (en) 2016-11-21 2018-11-20 Lockheed Martin Corporation System and method of dithering a sensor assembly

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6121701A (ja) * 1984-07-10 1986-01-30 Mitsubishi Heavy Ind Ltd フラツシユエバポレ−タ

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3414761A (en) * 1965-09-16 1968-12-03 S F D Lab Dither tuner for a coaxial magnetron
US3441795A (en) * 1966-06-24 1969-04-29 Sfd Lab Inc Ditherable and tunable microwave tube having a dithered tuner actuator of fixed length
US3441794A (en) * 1966-06-15 1969-04-29 Varian Associates Dither-tuned tunable microwave tube apparatus
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 (2)

* 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
JPS4866202A (no) * 1971-12-16 1973-09-11

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3414761A (en) * 1965-09-16 1968-12-03 S F D Lab Dither tuner for a coaxial magnetron
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 (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0012034A1 (en) * 1978-12-05 1980-06-11 English Electric Valve Company Limited Variable frequency magnetron
US4613788A (en) * 1983-04-29 1986-09-23 U.S. Philips Corporation Arrangement in a tunable high frequency transmitter tube
US5449972A (en) * 1993-07-30 1995-09-12 Litton Systems, Inc. Low-torque magnetron tuning device
US10132661B2 (en) 2016-11-21 2018-11-20 Lockheed Martin Corporation System and method of dithering a sensor assembly

Also Published As

Publication number Publication date
DE2512624A1 (de) 1975-09-25
JPS574055B2 (no) 1982-01-23
JPS514954A (no) 1976-01-16
FR2265173A2 (no) 1975-10-17
FR2265173B2 (no) 1980-07-11

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