WO1985002071A1 - Dispositif d'accord pour appareil de puissance a haute frequence - Google Patents

Dispositif d'accord pour appareil de puissance a haute frequence Download PDF

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Publication number
WO1985002071A1
WO1985002071A1 PCT/US1984/001798 US8401798W WO8502071A1 WO 1985002071 A1 WO1985002071 A1 WO 1985002071A1 US 8401798 W US8401798 W US 8401798W WO 8502071 A1 WO8502071 A1 WO 8502071A1
Authority
WO
WIPO (PCT)
Prior art keywords
electrically conductive
cavity
frequency
housing
tuning
Prior art date
Application number
PCT/US1984/001798
Other languages
English (en)
Inventor
Geoffrey Thornber
Original Assignee
Brunswick Corporation
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 Brunswick Corporation filed Critical Brunswick Corporation
Publication of WO1985002071A1 publication Critical patent/WO1985002071A1/fr

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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
    • H01J23/18—Resonators
    • H01J23/20—Cavity resonators; Adjustment or tuning thereof
    • H01J23/213—Simultaneous tuning of more than one resonator, e.g. resonant cavities of a magnetron

Definitions

  • This invention relates generally to radio frequency power devices and more particularly to tuning assemblies for oscillating the frequency output of such devices . More specifically, the subject invention relates to a novel tuning assembly for oscillating the frequency of an electromagnetic field generated within a hermetically sealed device, and in particular within a magnetron tube, to thereby oscillate the frequency output of such device.
  • Radio frequency power devices are well known in the art. Such power devices may generate radio frequency outputs at a fixed frequency or at variable frequencies oscillating within a specified operating frequency band.
  • radio frequency power devices include therewithin a hermetically sealed housing which is either evacuated, as in the case of a vacuum tube or a magne- tron, or is filled with an inert gas.
  • a variety of well known systems are utilized to generate an electromagnetic field within the hermetic housing, with the current induced from such an electromagnetic field being directed to an output antenna.
  • One commonly used arrangement for generating such an electromagnetic field includes positioning an anode ring- about a centrally disposed cathode within the hermetic ho sing, and then establishing a magnetic field around, the anode.
  • the anode ring defines a cavity space radially inwardly thereof, wherein the fre- quency of the electromagnetic field is established.
  • the cavity space wherein the frequency of the electro ⁇ magnetic field is defined may be located exterior to the anode.
  • the frequency of the electromagnetic field is defined by the physical size and shape of the cavity as well as the conductive prop ⁇ erties of the material utilized to form the cavity.
  • One known cavity arrangement includes a plurality of tabs or vanes projecting radially inwardly from the inner surface of the anode ring, and the frequency of the electromagnetic field is determined by the conductive properties of the vanes, the size of the vanes, the spac ⁇ ing between the vanes , and the manner in which the vanes may be electrically interconnected at their radially inner edges.
  • any desired frequency may be pre-selected prior to construction of the radio frequency device.
  • the manner in which th ' e vane structure is constructed and altered so as to establish a desired fixed frequency is well known in the art and will not be discussed in any detail herein.
  • variable frequency power devices how ⁇ ever, the frequency of the electromagnetic field within the hermetic housing is tunable or varied in an oscillat- ing manner by changing the volume of the frequency deter ⁇ mining cavity in an oscillatory fashion, thereby changing the inductive properties thereof.
  • One known technique for changing the volume of the frequency determining cavity includes positioning an electrically conductive member within the cavity and oscillating that member therewithin, thereby varying the volume of the cavity in an oscillatory manner. To achieve such oscillatory motion of an electrically conductive member within the cavity, prior devices have commonly utilized mechanical arrangements for moving the electrically conductive member.
  • One such mechanical tuning arrangement utilizes a thin wall bellows or diaphragm as part of the hermetic housing.
  • the electrically conductive members are then mechanically connected to such a bellows or diaphragm, and the bellows or diaphragm are mechanically oscillated • by a motor located outside the hermetic housing.
  • Another known tuning arrangement for changing the volume of the frequency determining cavity includes positioning electrically conductive members within the cavity and rotating such members along the inner surface of the anode ring. Such rotation is effected by magneti ⁇ cally coupling the rotating electrically conductive member to an electromagnetic power source disposed out- side the housing.
  • a distinct disadvantage to this latter technique is that by rotating an electrically conductive member within the frequency determining cavity, the electromagnetic field frequency can be varied, but not in an oscillatory manner.
  • the movable bellows or diaphragm arrangement described above also has certain disadvantages.
  • One major disadvantage with this mechanical tuning arrangement is that the walls of the bellows or diaphragm must be relatively thin to effect such movement and are thereby subject to mechanical fatigue and failure.
  • a further disadvantage of the above mechanical tun- ing assemblies is that a significant energy input is required to operate such assemblies. This requirement is due to the mechanical resistance offered by the bellows or. diaphragm arrangement as well as to the atmospheric dampening effect on the mechanical parts located exterior to the hermetic housing or envelope.
  • novel tuning assembly of the present invention overcomes the disadvantages of known mechanical tuning assemblies, and provides a relatively simple yet efficient means for oscillating the frequency of the electromagnetic field generated within such radio frequency power sources.
  • a tuning assembly for selectively oscillating the frequency output of a radio frequency power source. It is another object of the present invention to provide a tuning assembly for selectively oscillating the frequency of an electromagnetic field within a hermetically sealed device wherein the device has a rigid or hermetic housing. A further object of the present invention is to pro ⁇ vide a magnetron tube having an oscillating frequency output and a rigid, hermetically sealed housing.
  • a tuning assembly for selectively oscillating the frequency of an electromagnetic field within a hermetically sealed device wherein such device includes a rigid, hermetically sealed housing, 'a mechanism for generating an electro ⁇ magnetic field within the housing, and elements for defining a cavity within the housing for establishing the frequency of the electromagnetic field.
  • the novel tuning assembly includes electrically conductive members mounted for linear movement within the frequency defining cavity to selectively vary the volume of the cavity to oscillate, the e tablished frequency of the electromag- netic field.
  • a mounting assembly for mounting the electrically conductive members is disposed within the rigid housing and is adapted for oscillatory movement at a pre-determined mechanical resonant frequency to move the electrically conductive members in the aforementioned linear manner.
  • a power source is located exterior to the rigid housing and is magnetically coupled to the mounting assembly for exciting the mounting assembly.
  • the tuning assembly of the present invention may be adapted to oscillate the electromagnetic * field frequency within any hermetically sealed device having a rigid, hermetically sealed housing and a frequency defining cavity within such housing.
  • the subject invention how ⁇ ever, is particularly useful in radio frequency power sources such as variable frequency magnetron tubes .
  • the mounting mechanism includes a support member for securely mounting the electrically conductive members within the housing.
  • a spring, mechanism is provided for interconnecting the support member and the housing and is adapted to permit oscillatory movement of the support member within the housing.
  • the pre-selected mechanical resonant frequency of the mounting mechanism is directly determinable in accordance with known techniques from the mass of the electrically conductive members and the mounting mechanism as well as the spring rate of the spring mechanism.
  • the support member is maintained at a constant pre-determined oscillatory movement by pulsing the power source at the same frequency as the pre ⁇ selected mechanical resonant frequency of the mounting mechanism. .In this manner, the frequency of the electro- magnetic field, and thereby the output frequency of the device, may be selectively oscillated in accordance with the pre-selected mechanical resonant frequency of the tuning assembly.
  • Figure 2 is a cross-sectional view taken substan ⁇ tially along the line 2-2 of Figure 1, illustrating the frequency defining cavity of the magnetron tube of Figure 1; :>
  • Figure 3 is a cross-sectional view taken substan ⁇ tially along the line 3-3 of Figure 1, illustrating the mounting mechanism of the present invention
  • Figure 4 is an exploded side elevation view, with some parts in section, of the tuning assembly of the present invention in relation to the anode structure of the magnetron tube shown in Figure 1;
  • Figure" 5 is an enlarged front prospective view of the electrically conductive members and support member of one embodiment of the tuning assembly of the pres nt invention.
  • Figure 6 is a side elevation view of the embodiment illustrated in Figure 5;
  • Figure 7 is an enlarged front prospective view of the mounting members and support member of a second embodiment of the tuning assembly constructed in accordance with the present invention;
  • Figure 8 is a side elevation view of the embodiment illustrated in Figure 7;
  • Figure 9 is a side elevation view of one electri ⁇ cally conductive member of the embodiment illustrated in Figures 5 and 6;
  • Figure 10 is a side elevation view of one electri- cally conductive member of the embodiment illustrated in Figures 7 and 8.
  • a hermetically sealed device such as a magnetron tube 10 is illustrated and incorpo- rates the tuning assembly of the present invention.
  • Radio frequency power sources such as the magnetron tube 10 have many different uses , Figure 1 illustrating the tube 10 mounted in an enclosure 12. It is to be under ⁇ stood, however, that the present invention is not to be limited for use in such a magnetron tube 10, but rather may be utilized * in any device wherein the device includes a rigid hermetic housing and requires selective oscilla ⁇ tion of an electromagnetic field generated within the housing.
  • the illustrated magnetron tube 10 includes a her ⁇ metically sealed housing 14 having an evacuated internal atmosphere.
  • the housing 14 is entirely rigid and is com ⁇ prised of a tuner assembly housing 16, an anode assembly 18, and two magnetic pole piece housings 20 and 22 dis- posed on either side of the anode 18..
  • These members 16-22 are -all heliarc welded together to form the hermetically sealed housing 14.
  • the anode assembly 18 Disposed within the housing 14 is the anode assembly 18, which forms a part of the housing 14, and a cathode assembly 24 spaced from the anode 18.
  • the cathode 24 is centrally disposed along the longitudinal axis of the housing 14, which in preferred form is annular in shape.
  • the anode 18 preferably is in the. form of an annular ring 26 having an inner raised rim portion 28 projecting radially inwardly toward the cathode 24 from the center portion of the ring 26.
  • the inner surface of the ring 26 defines generally a cavity area 30 ( Figure 2) which is disposed between the anode 18 and the cathode 24.
  • the cavity area 30 comprises the area to establish the frequency of the electromagnetic field generated at the anode 18 by the electrons emitted from the cathode 24, which interact with the anode 18 and the magnetic field within the anode 18, as described in greater detail below.
  • Disposed on either side of and coaxially with the anode ring 26 are a pair of magnetic pole pieces 32 and 34.
  • the magnetic pole pieces 32 and 34 act in conjunc ⁇ tion with a permanent magnet assembly 36 so as to create a magnetic field about the anode 18 and the cathode 24.
  • the interaction of the electrical field between the cathode 24 and the anode 18 and the magnetic field created by the magnetic assembly 36 and the pole pieces 32 and 34 occurs within the cavity 30 to establish an electromagnetic field at the anode 18.
  • the electromagnetic field at the anode 18 creates an alternating current in the anode 18 which passes along an antenna member 38.
  • the alternating current induced in the anode 18 flows back and forth along the antenna 38 and changes at a specific radio frequency rate estab ⁇ lished by the cavity 30. This current, generates electro- magnetic waves from the antenna 38 which propagate outwardly•through the radome structure 40.
  • the magnetron tube 10 includes a tuning assembly 42 constructed in accordance with the present invention.
  • the assembly 42 includes the outer hermetically sealed housing 16, which is preferably annular in shape, and a tuning mechanism 43. More particularly, a mount ⁇ ing assembly 44 is disposed coaxially within the housing 16.
  • the mounting assembly 44 includes a tubular support member 46 suspended for linear reciprocating or oscillatory movement within the housing 16, and a tubular support element 48 which has a smaller diameter than the diameter of the support member 46 and is mounted on an annular flange 50 coaxially with and for linear movement with the support member 46.
  • An electrically conductive element 52 is mounted on the end of the tubular support element 48 and extends into the cavity 30 defined by the anode 18.
  • the electrically conductive element 52 includes a plurality of electrically conductive members 54 circum- ferentially spaced about the end of the support element 48 and projecting into the cavity 30 as described in greater detail below.
  • the electrically conductive element 52, the support element 48 and the support member 46 are all secured together to form the tuning mechanism 43 and move in unison in a linear oscillating manner.
  • a spring assembly 56 is provided for interconnecting the mounting assembly 44 to the housing 16.
  • the spring assembly 56 includes a plurality of leaf springs 58 securely mounted at one end to the support member 46 adjacent to the junction of the support ele ⁇ ment 48 and at the other end to the housing 16, and a plurality of leaf springs 60 securely mounted to the lower opposite end of the support member 46 and the housing 16.- The ends of each spring 58, 60 are securely mounted so that the mounting assembly 44 is suspended within the housing 16.
  • the springs 58 are positioned equidistantly about the circumference of the support member 46, and the springs 60 are also disposed equidistantly about the circumference of the support member 46.
  • the support member 46 and the support element 48 are constructed from non-magnetic material.
  • the mounting assembly 44 further includes an annular magnetic member 62 secured about the support member 46 by a pair of annular brackets 64, 66. The magnetic member 62 is adapted to move in uniform linear movement with the mounting assembly 44.
  • the tuning mechanism 43 which includes the entire mounting assembly 44 and the electrically conductive element 52, is designed to move at a natural, pre- selected mechanical resonant frequency in a linear direction coaxial with the longitudinal axis thereof.
  • the natural resonant frequency of the tuning mechanism 43 is dependent on the mass and spring rate of the mechanism 43. Therefore, the natural resonant frequency of the tuning mechanism 43 may be readily pre-selected by varying either the mass of the mechanism 43 and/or the spring rate of the spring assembly 56.
  • the techniques for calculating the natural resonant frequency from the mass and spring rate are well known in the art and will therefore not be described herein..
  • the natural resonant frequency of the mechanism 43 may still be altered by inserting a spring coil 66 ( Figure 1) within the support member 46.
  • the spring coil 66 is affixed to the inner surface of the flange 50 and the inner surface of the bottom portion of the housing 16.
  • the spring rate of the coil spring 66 may be selectively varied so as to 'achieve the desired natural resonant frequency for the tuning mechanism 43.
  • a power source 68 is provided about the exterior surface of the housing 16 and is magneti ⁇ cally coupled to the magnetic member 62.
  • the power source 68 comprises an electromagnetic .coil 70 wrapped around the housing 16.
  • the coil 70 is adapted to be alternately energized and de-energized in a pulsating manner so that when the coil 70 is energized, the magnetic member 62 is attracted to move the tuning mechanism 43 in a first linear direction. After such a pulsing of the coil, the coil 70 returns to a de- energized state, and the spring mechanism 56 returns the tuning mechanism 43 beyond its initial position, thereby moving the mechanism 43 in a second opposite linear direction.
  • the coil 70 is repeatedly pulsed at the same frequency rate as the natural resonant fre- quency of the tuning mechanism 43 so as to maintain the tuning mechanism 43 in a constant oscillating motion.
  • This oscillating movement of the tuning mechanism 43 causes the electrically conductive element 52 to oscil ⁇ late within the cavity 30.
  • This mechanical oscillation of the electrically conductive element 52 within the cavity 30 changes the volume of the cavity 30 in an oscillatory manner, and as the volumes of the cavity 30 is changed, the nductance of current from the electro ⁇ magnetic field is changed in a similar oscillatory manner so as to vary the frequency of the electromagnetic field within the cavity 30 in such an oscillatory manner.
  • the annular assembly 18 includes the anode ring 26 and the rim mem ⁇ ber 28.
  • the annular anode assembly 18 further includes a plurality of spaced tabs in the form ' of vanes 72 integrally formed with the rim 28 and extending radially inwardly toward the cathode
  • Each .vane 72 is a flat electrically conductive mem ⁇ ber having a plane aligned with the central axis of the anode ring 26.
  • the vanes 72 divide the cavity area 30 into a plurality of individual cavities or chambers 74 defined between the vanes 72.
  • a plurality of electrically conductive strap members 76 are prefer ⁇ ably provided in the form of annular rings which selec ⁇ tively interconnect a plurality of vanes 72. In pre ⁇ ferred form, there are . two strap members 76 and 76' * which interconnect alternate vanes 72 so that one-half of the vanes 72 are electrically connected to one strap 76, and the other half of the vanes 72 are interconnected to the second strap 76'.
  • the straps are utilized in con ⁇ junction with the vanes 72 and the ring 28 to define a particular frequency for the electromagnetic field created within the cavity area 30.
  • Use of such straps 76, 76', and the technique for calculating the appropri ⁇ ate dimensions and arrangements of the vanes 72, the straps 76, 76', and the ring 26, to establish a specific frequency, are well known in the art and are therefore not disclosed specifically herein.
  • the electrically con ⁇ ductive element 52 is preferably in the form of a plurality of electrically conductive members 54.
  • the members 54 are mounted circumferentially about the end of the support element 48 and are appropriately spaced so that each member 54 is adapted for positioning within one cavity 74.
  • the end portion of each member 54 is positioned so that it remains within a cavity 74 as the tuning mechanism 43 is oscillated.
  • the tuning mechanism 43 oscillates the electrically conductive member 54 also oscillates within a cavity 74, thereby changing the volume of each cavity 74 in a uniform oscillating manner.
  • the entire volume of the cavity area 30 is changed in a uniform oscillating man ⁇ ner. This, change in the volume Of each cavity 74 by the
  • the magnetic pole pieces 32 and 34 are preferably comprised of a soft magnetic material, such as iron, which is not permanently magnetized.
  • the magnetic pole pieces 32 and 34 direct the magnetic field from the permanent magnetic assembly 36 into the interaction space between the cathode assembly 24 and the anode assembly 18.
  • the permanent magnetic assembly 36 may comprise any known arrangement.
  • the assembly 36 includes two permanent magnets 78 and 80 interconnected by steel tubes 82, 82', and a sleeve member 84.
  • the strength of the magnetic field may be selectively varied depending upon the strength of the permanent magnets 78, 80.
  • the magnetic pole piece 34 includes an annular bracket assembly 86, which functions to mount the perma ⁇ nent magnet 80 as well as to form the housing 20, and a magnetic pole piece member 88.
  • the magnetic pole piece member 88 includes a plurality of orifices or channels 90 which are coaxially aligned with the longitudinal axis of the electrically conductive members 54 and the anode ring 26.
  • the channels 90 function as passageways for the electrically conductive members 54 between the support element 48 and the cavities 74.
  • each electrically conductive member 54 comprises a pin member 92 constructed from any suitable electri ⁇ cally conductive material.
  • the pin 92 has a substan ⁇ tially uniform diameter along its length, and includes a base portion 94 which is notched to form a ledge for mounting the pin 92 to the support element.48.
  • the diameter of the pin 92 is selected so that the pin 92 freely passes through a channel 90 and is positioned between a pair of vanes 72 without making contact therewith.
  • the member 54 is in the form of an elongated member 95 having an expanded diameter end portion 96 for positioning within a cavity 74.
  • the end portion 96 is constructed from electrically conductive material and is of sufficient diameter to substantially fill the cavity 74 in cross-sectional dimension, as illustrated in Figure 2.
  • the elongated member 95 also includes a shaft portion 98 which interconnects the end portion 96 to the support element 48, and the diameter of the shaft portion 98 is substantially less than the diameter of the end portion 96.
  • the shaft portion 98 is sized so that the shaft portion 98 remains within the channel 90 as the tuning mechanism 43. oscillates. In this manner, the amount of material within the channel
  • the shaft portion 98 may also be constructed from an electrically non-conductive material such as a ceramic material. In this manner, the secondary resonant effects in the magnetic pole piece 34 are almost non ⁇ existent.
  • the shaft 98 preferably includes a base portion 100' which is notched to form a ledge for attach- ment to the support element 48.
  • the cathode structure 24 is preferably in the form of a helical, spring-like mem ⁇ ber 102 positioned between two end plates 104, 106.
  • the helical member 102 is preferably constructed from porous tungsten impregnated by electron emissive material, such as barium and calcium aluminates, as known in the art.
  • This particular cathode structure is directly heated by a current from conductors 108.
  • This direct heating of the impregnated tungsten causes improved electron emis- sion by the cathode 24 and rapid warm-up. It has been found that this arrangement for heating the cathode permits warm-up in about 5 seconds instead of about 12 to 20 seconds if the cathode were indirectly heated in the conventional way.
  • the helical shape of the cathode 24 presents a cylindrical outline with greatly increased emissive surface.
  • This combination of the increased emissive surface and the directly heated cathode with fast warm-up provides a considerably more efficient electron emitter assembly than has been previously known in a pulse magnetron.
  • the tuning assembly 42 as described above provides a constantly variable frequency across a specific fre ⁇ quency band, generally varying 57. on either side of a center frequency.
  • the tuning mechanism 42 as disclosed in the magnetron 10 of Figure 1 can provide a 100-300 MHz frequency variation around any selected center frequency, the selected center frequency being
  • ⁇ established by the dimensions of the anode assembly and the cavity defining elements.
  • Such a center frequency can be established at any desired frequency, for example, between 1-50 gigahertz, by utilizing known technique in the art.
  • the natural resonant frequency of the tuning mechanism 43 may be generally set at approximately 15-20 cycles per second.
  • the natural resonant frequency of the tuning mechanism 43 may be established at any selected level, thereby permitting any desired frequency variation to occur in the electro ⁇ magnetic field at the anode 18.
  • the present invention provides a novel mechanism whereby the frequency of an electromagnetic field within a hermetically sealed device may be readily varied in an oscillatory manner.
  • This oscillatory variation of the frequency is achieved by a mechanical oscillating device which has all moving mechanical components disposed within a rigid housing. Therefore, there are no thin walled or flexible portions required in the hermetically sealed housing, which design prevents atmospheric leakage and provides a long storage or shelf life.
  • the tuning assembly of the invention is used in a magnetron or other vacuum tube, all the mechanical parts perform within a vacuumj'' thereby obviating the dampening effect of any atmospheric environment.
  • the tuning assembly of the present invention is based on a natural resonant frequency of the tuning mechanism. To oscil- 5 late this mechanism in a desired manner, only a small amount of energy in a pulsed form is required, inasmuch as the power source for moving the tuning assembly is magnetically coupled to the tuning mechanism.

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Abstract

Un assemblage d'accord (42) permet de faire osciller de manière sélective la fréquence d'un champ électromagnétique à l'intérieur d'un dispositif hermétiquement scellé (12), ce dispositif comprenant un boîtier rigide, hermétiquement scellé (14), un dispositif servant à produire le champ électromagnétique à l'intérieur du boîtier (32, 34 et 36), des éléments définissant une cavité (30) à l'intérieur du boîtier pour établir la fréquence du champ électromagnétique. L'assemblage d'accord (42) comprend des organes électriquement conducteurs (54) montés de manière à pouvoir se déplacer linéairement à l'intérieur de la cavité (30) pour en modifier sélectivement le volume et faire osciller la fréquence déterminée. Des éléments (52) disposés dans le boîtier rigide (14) permettent de monter les organes électriquement conducteurs (54), et sont conçus pour accomplir un mouvement oscillatoire à une fréquence de résonance mécanique prédéterminée, pour déplacer les organes électriquement conducteurs (54) de la manière linéaire décrite. L'assemblage d'accord (42) incorpore un assemblage émetteur d'électrons possédant un assemblage de cathode à haut rendement (24, 102) agencé sous la forme d'un ressort hélicoïdal (102), l'assemblage de cathode (24, 102) étant composé de tungstène poreux imprégné par un matériau électro-émetteur et étant chauffé directement par un courant électrique (en 108). Une source de puissance (108) est enfin prévue à l'extérieur du boîtier rigide (14) et est couplée magnétiquement aux éléments de montage (44) pour exciter le montage des éléments (44).
PCT/US1984/001798 1983-11-02 1984-11-02 Dispositif d'accord pour appareil de puissance a haute frequence WO1985002071A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US54820383A 1983-11-02 1983-11-02
US548,203 1983-11-02

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WO1985002071A1 true WO1985002071A1 (fr) 1985-05-09

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WO (1) WO1985002071A1 (fr)

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JP6959103B2 (ja) * 2017-11-02 2021-11-02 新日本無線株式会社 マグネトロンカソード

Citations (4)

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US2589885A (en) * 1945-10-19 1952-03-18 Us Sec War Tunable magnetron
US2700000A (en) * 1952-02-27 1955-01-18 Philips Corp Thermionic cathode and method of manufacturing same
US2814761A (en) * 1955-06-07 1957-11-26 Palmer P Derby Electro-mechanical tuning of a c. w. magnetron
US4223246A (en) * 1977-07-01 1980-09-16 Raytheon Company Microwave tubes incorporating rare earth magnets

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JPS51135240A (en) * 1975-05-19 1976-11-24 Toyo Noki Kk Lifting conveyor of beet harvester
JPS5855881B2 (ja) * 1977-08-30 1983-12-12 松下電工株式会社 人工木質単板の製法
JPS5855882B2 (ja) * 1977-10-31 1983-12-12 松下電工株式会社 人工木質単板の製法
JPS5565441A (en) * 1978-11-09 1980-05-16 Toshiba Corp Direct mounting
US4331935A (en) * 1979-08-13 1982-05-25 Brunswick Corporation Tuning apparatus for a radio frequency power device
JPS5789535A (en) * 1980-11-20 1982-06-03 Sanyo Electric Co Ltd Device for correcting mounted posture of part
JPS58196099A (ja) * 1982-05-11 1983-11-15 松下電器産業株式会社 電子部品装着装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2589885A (en) * 1945-10-19 1952-03-18 Us Sec War Tunable magnetron
US2700000A (en) * 1952-02-27 1955-01-18 Philips Corp Thermionic cathode and method of manufacturing same
US2814761A (en) * 1955-06-07 1957-11-26 Palmer P Derby Electro-mechanical tuning of a c. w. magnetron
US4223246A (en) * 1977-07-01 1980-09-16 Raytheon Company Microwave tubes incorporating rare earth magnets

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP0160094A4 *

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JPS61500290A (ja) 1986-02-20
EP0160094A1 (fr) 1985-11-06
EP0160094A4 (fr) 1988-06-16

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