US2520955A - Trapezoidal cavity magnetron - Google Patents

Trapezoidal cavity magnetron Download PDF

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Publication number
US2520955A
US2520955A US462132A US46213242A US2520955A US 2520955 A US2520955 A US 2520955A US 462132 A US462132 A US 462132A US 46213242 A US46213242 A US 46213242A US 2520955 A US2520955 A US 2520955A
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US
United States
Prior art keywords
magnetron
generally
cathode
pockets
copper
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
US462132A
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English (en)
Inventor
Ernest C Okress
Ilia E Mouromtseff
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.)
CBS Corp
Original Assignee
Westinghouse Electric Corp
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 BE474540D priority Critical patent/BE474540A/xx
Priority claimed from US460376A external-priority patent/US2564716A/en
Application filed by Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Priority to US462132A priority patent/US2520955A/en
Priority to GB8102/47A priority patent/GB646704A/en
Priority to CH271573D priority patent/CH271573A/de
Priority to FR995029D priority patent/FR995029A/fr
Application granted granted Critical
Publication of US2520955A publication Critical patent/US2520955A/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
    • H01J23/165—Manufacturing processes or apparatus therefore
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J19/00—Details of vacuum tubes of the types covered by group H01J21/00
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0001—Electrodes and electrode systems suitable for discharge tubes or lamps
    • H01J2893/0012—Constructional arrangements
    • H01J2893/0019—Chemical composition and manufacture
    • H01J2893/0022—Manufacture

Definitions

  • This invention relates ;to generators of high frequency electricity, -and particularly those of the type called magnetrons.
  • the principal objectrof our invention is an improved nagnetron for energy in the regionof centimeter wavelengths and amethod of manufacture.
  • Another object of our invention is the manufactureo'f .magnetrons by a method which avoids the necessity of very accurate machining.
  • a further object of our invention is to simplify and cheapen the construction of magnetrons.
  • a still further object of our invention is to increase the permissive tolerances in the manufacture of magnetrons.
  • Fig. 1 is a sectional View onthe line I-I of Fig. 2, in the direction of the arrows, with parts in evelation, of a magnetron embodying our invention.
  • Fig. 2 is a perspective view on the line -II--II of Fig. 1, in the direction of the arrows, with parts in elevation.
  • Fig. 3 is a sectional perspective View of a blank which is desirably used in manufacturing the body member of the magnetron.
  • Fig. 4 is a perspective View of oneof the partition elements of a magnetron embodying our inyention.
  • Fig. :5 is a fragmentary view corresponding to Fig. l but showing a modification.
  • resonant cavity magnetrons such as those in the 10 centimeter range, have previously been constructed as there illustrated in Fig..12, that is, with generally cylindrical cavities disposed about ,a central pocket adapted to receive the cathode andcommunicating therewith.
  • slots took the place of the generally cylindrical cavities, three forms being theredisclosed; first, in which-the slots were, of generally uniform Width and separated by partitions generally trapezoidal or sector shaped in section on a plane perpendicular to the axis; second, in which said slots were generally trapeaoida l or sector and separated by generally trapezoidal or sector shaped partitions; and
  • this conductor member is desirably connected by eutectic gQld-copper 3 solder to a steel ring 43 and the combination secured to the flange portion 37 by BT solder, as shown most clearly in Fig. 1. 31" solder melts at about 779 C. and is 72% silver and 28% copper.
  • the cathode 33 in the present embodiment is shownas consisting of a helicaltungsten filament 44 enclosed in an electron-emitting housing 45 composed of a mixture of oxides of strontium, barium and calcium on a nickel sleeve and supplied with power from a suitable source by tungsten leads 45 and 47.
  • These leads project through copper casings 48 and 49, held in place as described in connectionwith the Okress application, Serial No. 460,376, previously referred to, which also shows how the power may be supplied to the cathode including the use of filters.
  • Figs. 3 and 4 show the blanks which are desir ably employed to make the magnetron body during the process of manufacture.
  • a plurality of plates 5i desirably of uniform thickness and numerically corresponding with the pockets, in this instance eight.
  • These plates are desirably formed of selenium copper alloy or other similar metal, and are relatively thin although sufficiently heavy to provide a rugged construction.
  • This boss is, in turn, slotted or grooved longitudinally or parallel to the axis, as indicated at 56 to a width so as to snugly receive the plates 5! and leave inwardly extending sections 57, nu
  • RT solder melts at about 682 C. and is 60% silver, 25% copper, and
  • a magnetron Ii consistingof a body or anode portion 2 which, like the magnetron II, is desirably formed of copper and has selenium copper alloy partitions, like the partitions of the preceding embodiment, only those numbered 15 Hi Il and I8 being shown, projecting inwardly from the peripheral portion 22 and separated by pockets like those of the preceding embodiment,
  • the housing or anode member !2 is formed by taking a plain hollow cylinder and connecting radially projecting partition wall members in place by means of BT solder, indicated at 58*, said plates being desirably held with their outeredges, as by means of a jig, in abutting engagement with the inner surface of the cylindrical outer member 22 while in a hydrogen furnace where the soldering is effected, as in the preceding embodiment.
  • an alternative terminal 34 which, like the terminal 35 of the Okress application, Serial No. 460,376, previously referred to, has large and tapering portions desirably formed of tungsten and a small or inner portion formed of electrolytic copper;
  • the inner portion of the terminal 37 5* instead of being bent back on itself and connected to the outer cylindrical portion of the housing, extends to one of the partition plates, such as that designated Hi passing into a recess 35 thereof, and secured thereto in any desired manner, as by means of BT solder. It will be noted that such. a coupling may be used in the preceding embodiment, or that of the preceding embodiment used in this embodiment, interchangeably, within the spirit and scope of our invention.
  • the portions l3, Id, etc. or l5 I6 etc. projecting inwardly from the peripheral portion 22 or 22 are all generally thin and of uniform thickness, like the slots 23 to 29, inclusive and 3! of the first embodiment of the Okress application, Serial No. 460,37 6, previously referred to, that is, the slots or pockets therebetween aregenerally triangular, trapezoidal, or sector shaped in section.
  • the inner circumferential width of each pocket is uniform and may correspond with the uniform circumferential width of the separating partitions, notwithstanding the variation in outer circumferential width of these parts, although this correspondence is not essential.
  • Magnetrons with sector shaped pockets are of lighter weight and have greater efficiency and power capacity than those with slotted pockets, relatively narrow, as illustrated in Fig. 1 of said Okress application, Serial No. 460,376, previously referred to.
  • the wavelength sensitivity for pockets of the present embodiment is between that of the rectangular or thin slot and the conventional cylindrical cavity structure previously referred to.
  • a magnetron housing formed as an outer generally cylindrical hollow conductive portion having longitudinal grooves from which flat sided partitions project inwardly defining a central cathode cavity communicating with chambers generally sector shaped in section on a plane perpendicular to the axis and disposed thereabout, a cathode assembly disposed in said cavity, leads from said cathode assembly projecting through said hollow cylindrical portion to outside of said housing, an output lead extending into said housing in a generally radial direction, curved backward and united to the inner surface of said housing, and a conductor casing in contact with and projecting from said housing and disposed coaxial with respect to said lead.
  • a magnetron housing comprising a hollow cylindrical portion of oxygen-free high-conductivity copper from which parallel-sided walls of selenium copper alloy project inward in generally radial directions defining a central cavity communicating with pockets disposed therearound, the outer edge portions of said walls fitting in grooves in said cylindrical portion and secured in place by solder.
  • a magnetron comprising a cathode and a hollow cylindrical conductive portion housing said cathode, a plurality of parallel-sided Walls of conductive material difierent from that of said cylindrical conductive portion encircled thereby axially shorter than said cylindrical portion, and projecting from the inner surface thereoi in generally radial directions defining a central cathode cavity communicating with pockets disposed therearound, the outer edge portions of said Walls fitting in grooves in the inner surface of said hollow conductive portion and held in place by solder, and cover members secured to the parts of said cylindrical portion which project axially beyond said walls.
  • An electron-discharge device comprising: a cathode; and an anode structure spaced from and surrounding said cathode and including a plurality of anode members, each pair of adjacent anode members comprising vanes secured in inwardly opening slots in a peripheral portion of said structure, thereby defining therewith a cavity resonator, said vanes having substantially straight side walls defining cavities expanding for an appreciable distance between the inner and outer ends thereof, leads from said cathode projeoting through said anode structure to outside of said device, an output lead extending into said structure in a generally radial direction, curved backward and united to the inner surface of the outer portion of said structure, and a conductor casing in contact with and. projecting outwardly from said outer portion and disposed coaxial with respect to said lead.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Microwave Tubes (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
US462132A 1942-10-01 1942-10-15 Trapezoidal cavity magnetron Expired - Lifetime US2520955A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
BE474540D BE474540A (xx) 1942-10-01
US462132A US2520955A (en) 1942-10-01 1942-10-15 Trapezoidal cavity magnetron
GB8102/47A GB646704A (en) 1942-10-01 1947-03-25 Improvements in or relating to electron discharge devices
CH271573D CH271573A (de) 1942-10-01 1947-04-24 Magnetron.
FR995029D FR995029A (fr) 1942-10-15 1949-07-15 Perfectionnements à la fabrication des blocs anodiques de magnetrons

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US460376A US2564716A (en) 1942-10-01 1942-10-01 Magnetron and method of manufacture
US462132A US2520955A (en) 1942-10-01 1942-10-15 Trapezoidal cavity magnetron

Publications (1)

Publication Number Publication Date
US2520955A true US2520955A (en) 1950-09-05

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ID=27039664

Family Applications (1)

Application Number Title Priority Date Filing Date
US462132A Expired - Lifetime US2520955A (en) 1942-10-01 1942-10-15 Trapezoidal cavity magnetron

Country Status (4)

Country Link
US (1) US2520955A (xx)
BE (1) BE474540A (xx)
CH (1) CH271573A (xx)
GB (1) GB646704A (xx)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2635210A (en) * 1946-03-01 1953-04-14 Millman Sidney Magnetron
US2658165A (en) * 1946-03-01 1953-11-03 John E Evans Magnetron tube with cavity resonator
US2666869A (en) * 1946-06-21 1954-01-19 Albert M Clogston Magnetron output coupling system
US3327161A (en) * 1963-09-28 1967-06-20 Nippon Electric Co Magnetron anode structure having cavities with rounded corners so that solder seepage cannot occur during brazing
US3363137A (en) * 1963-12-30 1968-01-09 Varian Associates High frequency electron discharge device having structural portions of a binary copper-iron alloy with 0.4 to 4.5% by weight of iron
US3428859A (en) * 1965-03-23 1969-02-18 M O Valve Co The Magnetron anode having temperature compensating members within the cavities of a different coefficient of thermal expansion from the cavities
DE1294563B (de) * 1961-10-04 1969-05-08 English Electric Valve Co Ltd Anodensystem fuer eine Magnetronroehre mit verstimmten Kreisen
US3455663A (en) * 1966-03-24 1969-07-15 Mallory & Co Inc P R Composite metal joint and a copper-silver,titanium brazing alloy
US3923551A (en) * 1966-06-02 1975-12-02 Arco Med Prod Co Method of making a thermopile with insulatingly separate junctions on an alumina insulator
EP0214611A2 (en) * 1985-09-09 1987-03-18 Kabushiki Kaisha Toshiba Anode assembly of magnetron and method of manufacturing the same

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE510398A (xx) * 1951-04-05
BE510664A (xx) * 1951-04-14

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR527131A (fr) * 1919-08-11 1921-10-20 Etablissements Gaumont Valve actionnée par torsion magnétique
US1547836A (en) * 1923-03-30 1925-07-28 Gen Electric Composite metal
US1666833A (en) * 1925-09-03 1928-04-17 William A Rhodes Vacuum tube
US2063342A (en) * 1934-12-08 1936-12-08 Bell Telephone Labor Inc Electron discharge device
US2129713A (en) * 1938-09-13 High frequency oscillation system
GB509102A (en) * 1937-10-08 1939-07-11 Electricitatsgesellschaft Sani Improvements in vacuum electric discharge apparatus
US2167201A (en) * 1935-06-28 1939-07-25 Pintsch Julius Kg Electron tube
US2247077A (en) * 1940-07-27 1941-06-24 Gen Electric High frequency electronic apparatus
CH215600A (de) * 1938-08-12 1941-06-30 Bbc Brown Boveri & Cie Anordnung mit einer Magnetronröhre.
US2270777A (en) * 1939-04-06 1942-01-20 Telefunken Gmbh Ultra short wave electron discharge device system
US2295396A (en) * 1939-10-07 1942-09-08 Rca Corp Electronic device
US2304186A (en) * 1939-12-14 1942-12-08 Int Standard Electric Corp Velocity modulated tube
US2408235A (en) * 1941-12-31 1946-09-24 Raytheon Mfg Co High efficiency magnetron

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2129713A (en) * 1938-09-13 High frequency oscillation system
FR527131A (fr) * 1919-08-11 1921-10-20 Etablissements Gaumont Valve actionnée par torsion magnétique
US1547836A (en) * 1923-03-30 1925-07-28 Gen Electric Composite metal
US1666833A (en) * 1925-09-03 1928-04-17 William A Rhodes Vacuum tube
US2063342A (en) * 1934-12-08 1936-12-08 Bell Telephone Labor Inc Electron discharge device
US2167201A (en) * 1935-06-28 1939-07-25 Pintsch Julius Kg Electron tube
GB509102A (en) * 1937-10-08 1939-07-11 Electricitatsgesellschaft Sani Improvements in vacuum electric discharge apparatus
CH215600A (de) * 1938-08-12 1941-06-30 Bbc Brown Boveri & Cie Anordnung mit einer Magnetronröhre.
US2270777A (en) * 1939-04-06 1942-01-20 Telefunken Gmbh Ultra short wave electron discharge device system
US2295396A (en) * 1939-10-07 1942-09-08 Rca Corp Electronic device
US2304186A (en) * 1939-12-14 1942-12-08 Int Standard Electric Corp Velocity modulated tube
US2247077A (en) * 1940-07-27 1941-06-24 Gen Electric High frequency electronic apparatus
US2408235A (en) * 1941-12-31 1946-09-24 Raytheon Mfg Co High efficiency magnetron

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2635210A (en) * 1946-03-01 1953-04-14 Millman Sidney Magnetron
US2658165A (en) * 1946-03-01 1953-11-03 John E Evans Magnetron tube with cavity resonator
US2666869A (en) * 1946-06-21 1954-01-19 Albert M Clogston Magnetron output coupling system
DE1294563B (de) * 1961-10-04 1969-05-08 English Electric Valve Co Ltd Anodensystem fuer eine Magnetronroehre mit verstimmten Kreisen
US3327161A (en) * 1963-09-28 1967-06-20 Nippon Electric Co Magnetron anode structure having cavities with rounded corners so that solder seepage cannot occur during brazing
US3363137A (en) * 1963-12-30 1968-01-09 Varian Associates High frequency electron discharge device having structural portions of a binary copper-iron alloy with 0.4 to 4.5% by weight of iron
US3428859A (en) * 1965-03-23 1969-02-18 M O Valve Co The Magnetron anode having temperature compensating members within the cavities of a different coefficient of thermal expansion from the cavities
US3455663A (en) * 1966-03-24 1969-07-15 Mallory & Co Inc P R Composite metal joint and a copper-silver,titanium brazing alloy
US3923551A (en) * 1966-06-02 1975-12-02 Arco Med Prod Co Method of making a thermopile with insulatingly separate junctions on an alumina insulator
EP0214611A2 (en) * 1985-09-09 1987-03-18 Kabushiki Kaisha Toshiba Anode assembly of magnetron and method of manufacturing the same
EP0214611A3 (en) * 1985-09-09 1988-11-23 Kabushiki Kaisha Toshiba Anode assembly of magnetron and method of manufacturing the same

Also Published As

Publication number Publication date
BE474540A (xx)
CH271573A (de) 1950-10-31
GB646704A (en) 1950-11-29

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