US2069832A - Electric discharge device - Google Patents

Electric discharge device Download PDF

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Publication number
US2069832A
US2069832A US759686A US75968634A US2069832A US 2069832 A US2069832 A US 2069832A US 759686 A US759686 A US 759686A US 75968634 A US75968634 A US 75968634A US 2069832 A US2069832 A US 2069832A
Authority
US
United States
Prior art keywords
cathode
shield
vanes
electric discharge
secured
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
US759686A
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English (en)
Inventor
Vivian L Holdaway
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.)
AT&T Corp
Original Assignee
Bell Telephone Laboratories 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 NL43310D priority Critical patent/NL43310C/xx
Application filed by Bell Telephone Laboratories Inc filed Critical Bell Telephone Laboratories Inc
Priority to US759686A priority patent/US2069832A/en
Priority to FR798597D priority patent/FR798597A/fr
Application granted granted Critical
Publication of US2069832A publication Critical patent/US2069832A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/13—Solid thermionic cathodes
    • H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment

Definitions

  • This invention relates to electric discharge devices and more particularly to an equipotential cathode assembly for such devices.
  • One object of this invention is to increase the 5 thermal efiiciency and operating life of cathodes for electric discharge devices.
  • Another object of this invention is to obtain good adhesion of thermionic material to the carrier therefor in cathodes.
  • Still another object of this invention is to obtain a substantially uniform dispersion of electrons from a cathode to an anode.
  • a cathode assembly comprises a cylindrical core of insulating material, a heater filament disposed about the core and coated with an insulating material, and a cathode element including a plurality of vanes arranged at like angles to radii of the cathode, the vanes being coated with a thermionic material such as alkaline earth oxides.
  • the vanes may be provided with flutes or corrugations, or otherwise mechanically roughened, they may have mesh screens secured to the surfaces thereof, or they may have a coarse grained layer of metal applied to their surfaces.
  • the cathode is substantially enclosed in a heat conserving shield including a cylindrical portion having lateral openings for allowing egress of 3 electrons, and double walled end portions.
  • a heat conserving shield including a cylindrical portion having lateral openings for allowing egress of 3 electrons, and double walled end portions.
  • the cylindrical portion'of the shield is provided withaplurality of deflectors or fins partially overlying the openings and arranged in the same relation, for example, parallel to the corresponding cathode vanes.
  • the cathode and shield assembly may be disposed within a cup-shaped anode disposed coaxially with the shield.
  • Fig. 1 is a perspective view of an electric discharge device illustrative of one embodiment of this invention, portions of the enclosing vessel and of the anode being broken away to show the internal structure more clearly;
  • Fig. 3 is a cross-sectional view along line 3-3 of Fig. 2;
  • Fig. 4 is a cross-sectional view along line 4-4 of Fig. 3;
  • Fig. 5 is a cross-sectional view showing another 5 manner of forming the cathode.
  • the electric discharge device shown therein comprises an enclosing vessel including cylindrical end portions Ill and H and an intermediate bulbous portion t2, the end portions l0 and i I having inwardly extending stems terminating in tri-armed presses l3 and M, respectively.
  • a cathode and shield assembly is supported from the press l3 by a wire or rod l5 embedded in the press at the center thereof and a plurality of rods or wires i6 each embedded in one arm of the press.
  • the cathode as shown clearly in Figs. 3 and 4, comprises a tubular core ll of "a suitable ceramic or insulating material, which is encompassed by a helical heater filament 18.
  • the heater filament may be covered with an insulating coating l9.
  • a metallic member for example of nickel, having a central tubular portion 20 and a plurality of vanes 2
  • the metallic member may be milled froma single piece of material or the central'tubular portion 20 and the vanes 2! may be formed separately and the vanes 2
  • the body of the cathode may also be formed by a number of flat strips of metal suitably secured together as shown in Fig. 5.
  • the heating element is placed within the regular closed polygon formed, and a continuous metallic path free from joints or welds is thus provided from the area receiving the heat radiation to the extremities of the fins or vanes.
  • Metallic end members or discs 23 are suitably secured, as by welding, to the tubular portion 20 and hold the core I! and heater filament I8 in position.
  • serves as thje cathode element of the device and the vanes 2
  • a thermionic material such as alkaline earth metal oxides.
  • the latter may have secured there to, prior to the application of the thermionic material, wire mesh members or screens 22.
  • the screens 22 may be omitted and the surfaces of the vanes 2
  • is substantially enclosed by a shield comprising a cylindrical por-' tion 24 coaxial with the cathode element, and double walled end portions each including a flat disc or plate 25 and a flanged dished plate 26.
  • the shield may be of nickel or the like and serves to conserve the ca thermal efllciency is obtained.
  • the cylindrical portion 24 is provided with a plurality of equally spaced apertures 21 through which electrons emanating from the cathode may pass.
  • the cylindrical portion 24 o! the shield is provided with fins or vanes28 arranged in simulation of a pin wheel, each fin or vane 28 being disposed in the same relation, for example substantially parallel, to a corresponding one of the vanes 2
  • the cathode and shield assembly may be supported as a unit by aplurality of L-shaped wires or rods 29 which are secured, as by welding, to the cathode member 20, 2
  • Each of the rods or wires l6 has secured thereto a conductor 30, the several conductors being entwined as shown in Fig. 1 and forming a leading-in connection to the cathode.
  • Each of the L-shaped wires or rods 29 carries an insulating sleeve 3
  • One end 33 of the heater filament I8 is secured to the lower end member 23.
  • the other end 34 of the heater filament extends through the central bore in the insulating core l1 and is secured to the wire or rod l5 which has a leading-in conductor 35 secured thereto.
  • the end 34 of the heater filament is insulated from the shield by an insulating member 36 disposed between the lower disc 25 and plate 26.
  • the electrical circuit for the heater filament then, comprises the conductor 35, rods or wires
  • the space current circuit connection to the cathode is made through conductors 39 and rods or wires l6 and 29, the wires 29 being connected to the cathode proper. This prohibits the space current from passing through the heater coil.
  • the cathode'and shield may be disposed within and coaxial with an inverted cup-shaped anode 31 having secured thereto a cup-shaped shield ode heat whereby a high 3
  • a platform 39 is disposed within the cup-shaped shield 38 and supported by a plurality of rods or wires 49 embedded in the press l4, and carries a stud 4
  • a heat shield 45 which may be a disc of nickel or the like, is provided.
  • the shield 45 is provided with an integral lip 46 which is secured to the rod or wire l5 and is provided also with oversized apertures 41 through which the rods or wires 5 pass. It is to be understood, 01' course, that other vapors or gases at suitable pressures may be used in this device.
  • An electrode assembly comprising a cathode.
  • a shield including a cylindrical portion encompassing said cathode and having lateral openings, one 'for each 01' said vanes, and deflector fins mounted on said portion and partially overlying said apertures, each of said fins being substantially paraliel to a corresponding one of said vanes.
  • An electric discharge device comprising a adJacent said openings and disposed in the same relation to the corresponding vanes, and acupshaped anode encompassing said cylindrical portion.

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  • Microwave Tubes (AREA)
US759686A 1934-12-29 1934-12-29 Electric discharge device Expired - Lifetime US2069832A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
NL43310D NL43310C (xx) 1934-12-29
US759686A US2069832A (en) 1934-12-29 1934-12-29 Electric discharge device
FR798597D FR798597A (fr) 1934-12-29 1935-10-26 Perfectionnements à des dispositifs à décharge électronique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US759686A US2069832A (en) 1934-12-29 1934-12-29 Electric discharge device

Publications (1)

Publication Number Publication Date
US2069832A true US2069832A (en) 1937-02-09

Family

ID=25056580

Family Applications (1)

Application Number Title Priority Date Filing Date
US759686A Expired - Lifetime US2069832A (en) 1934-12-29 1934-12-29 Electric discharge device

Country Status (3)

Country Link
US (1) US2069832A (xx)
FR (1) FR798597A (xx)
NL (1) NL43310C (xx)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2433821A (en) * 1945-05-23 1947-12-30 Sylvania Electric Prod Electron emissive cathode
US2592206A (en) * 1946-03-16 1952-04-08 Rca Corp Magnetron

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2433821A (en) * 1945-05-23 1947-12-30 Sylvania Electric Prod Electron emissive cathode
US2592206A (en) * 1946-03-16 1952-04-08 Rca Corp Magnetron

Also Published As

Publication number Publication date
FR798597A (fr) 1936-05-20
NL43310C (xx)

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