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US1665896A - Electron-discharge device - Google Patents

Electron-discharge device Download PDF

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Publication number
US1665896A
US1665896A US726623A US72662324A US1665896A US 1665896 A US1665896 A US 1665896A US 726623 A US726623 A US 726623A US 72662324 A US72662324 A US 72662324A US 1665896 A US1665896 A US 1665896A
Authority
US
United States
Prior art keywords
filament
spring
springs
supporting
shield
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
US726623A
Other languages
English (en)
Inventor
William A Ruggles
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Priority to US726623A priority Critical patent/US1665896A/en
Priority to FR602556D priority patent/FR602556A/fr
Priority to GB17998/25A priority patent/GB237258A/en
Application granted granted Critical
Publication of US1665896A publication Critical patent/US1665896A/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
    • H01J1/15—Cathodes heated directly by an electric current
    • H01J1/18—Supports; Vibration-damping arrangements

Definitions

  • My invention relates to improvements in electron discharge devices, particularly of the power tube type, the structure of which ordinarily comprises a plurality of electrodes such as a cathode, a plate and a grid, the space relations of which are destined to remain fixed during the operation of the device.
  • My invention relates more particularly to improvements in the method of supporting a filamentary cathode in devices of the above-mentioned type so that the predetermined space relatlon of the electrodes may remain unchanged during the life of the tube and thus prevent decrease of efficiency or actual break-down.
  • the cathode of the power type of vacuum tube or space current device consists usually of a metal conductor, generally of filamentary form, which is ordinarily disposed in V or zig-zag fashion upon suitable supports and arranged in electron responsiverelation to a, grid and other electrodes.
  • a metal conductor generally of filamentary form, which is ordinarily disposed in V or zig-zag fashion upon suitable supports and arranged in electron responsiverelation to a, grid and other electrodes.
  • the filament is subjected to a considerable degree of linear expansion and contraction. In order to prevent sagging of the filament and, therefore, contact thereof With the other electrodes of the device, it is necessary to'lreep the filament taut upon its support.
  • Springs of this t pe are usually heat treated in an atmosp ere of hydrogen at a temperatureof.1200 C. so as to impart to them a permanent set or definite degreeof elasticity. When so treated and subsequently used in space current devices of relatively low capacity, they are capable of supporting the filament for long periods of time with sufficient tension to prevent contact of the filament with the cooperating electrodes.
  • Fig. 1 shows a space current device of the ower tube type containing a form of resils 1:.nt filament support embodying the improvement of the invention.
  • Fig. 2 depicts the preferred method of attaching the protective or shielding means to the filament supporting springs.
  • the space current device in which theimprovement of the invention is to be used comprises trode 13 shown as a structure made of wire mesh surrounding the filament and an anode 15 of oval cross-section surrounding the oathode andgrid.
  • the cathode is stretched in V shaped or zig-zag fashion between suitable supports such as the insulating cross piece 8 and the branches of the cathode leadin 12 and 21.
  • the anode 15 which may be made of sheet metal, for example, molybdenum, is provided with strengthening ribs 16, 17 and is supported from the-end of the tube which is broken away.
  • tierods 18 which extend from the insulating cross-bars 8 to the metal cross-head 19.
  • the latter is in metallic connection with and secured to clamping sleeve 24, which in turn surrounds the glass stem 22 of the device.
  • the lead-in conductor 23 of the grid and the conductors 20, 14 serving to' supply current to the cathode are sealed into the stem 22 and its flare in the well known manner. While, for simplicity in illustration, only a portion of the grid and anode are shown it will, of course, be understood that in accordance with the usualpractice they surround the entire length of the cathode.
  • the means used for protecting the resillent filament supports from the effect of the conducted and radiated heat comprises a thin shield preferably of the discor washer type, represented by 1 in Figures 1 and 2.
  • This washer or disc shield is made of sheet metal, preferably molybdenum, nickel, tungsten or other suitable metal about 5 mils in thickness.
  • the diameter of the shield may vary with the size of the device in WhlChlt is to be used, but in general a diameter of five-sixteenths of an inch will be found suitable for tube sizes up to 1 kilowatt.
  • the shields preferably should be made of filament support is indicated in Figure 2.
  • the hole in the shield 1 should be just large enough to permit passage of the stem 2 of the spring 3.
  • the shield is interposed be tween the filament retaining 'hook' and the body of the spring and is held in place upon "thje'stem' 'or rod-hke'. member 2 by means'pf a wire bracing member bentin the form of a rlght angle which is attached to both the shield 1 and the stem or rod-like member 2 of the spring by welding arm 5 of said brace to the rod-like member or prolongation 2 of the spring and arm 6 of said brace to the under side of shield 1.
  • rod-like member 2 may be'a prolongation of the body of the spring or it may be a separate hooked rod welded tothe spring body member as shown at 7. In either case, 1t,1s
  • a resilient filament support comprising a coil spring body member, a rod-like memher. extending therefrom in the direction of the axis ofv said spring, filament retaining means upon said rod-like member and a heat dissipating metal plate disposed loosely upon said member and intermediate the spring body and the filament retaining means and perpendicular to the axis of said spring and bracing means attached to the metalplate and rod-like member.
  • an electric discharge device including'a filamentary electrode vand means for supporting the electrode, said -means comprising an insulator rigidly supported in the device and a spring member,
  • an electric discharge mounted on said extension, and means at- 5 device including a filamentary electrode, and tached to said extension and to said disk for means for supporting the electrode, said maintaining said disk in position.

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  • Electron Sources, Ion Sources (AREA)
US726623A 1924-07-17 1924-07-17 Electron-discharge device Expired - Lifetime US1665896A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US726623A US1665896A (en) 1924-07-17 1924-07-17 Electron-discharge device
FR602556D FR602556A (fr) 1924-07-17 1925-07-01 Perfectionnements aux dispositifs à décharge électronique
GB17998/25A GB237258A (en) 1924-07-17 1925-07-14 Improvements in electron discharge devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US726623A US1665896A (en) 1924-07-17 1924-07-17 Electron-discharge device

Publications (1)

Publication Number Publication Date
US1665896A true US1665896A (en) 1928-04-10

Family

ID=24919342

Family Applications (1)

Application Number Title Priority Date Filing Date
US726623A Expired - Lifetime US1665896A (en) 1924-07-17 1924-07-17 Electron-discharge device

Country Status (3)

Country Link
US (1) US1665896A (fr)
FR (1) FR602556A (fr)
GB (1) GB237258A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2563434A (en) * 1947-02-08 1951-08-07 Electron discharge tube assembly

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2563434A (en) * 1947-02-08 1951-08-07 Electron discharge tube assembly

Also Published As

Publication number Publication date
FR602556A (fr) 1926-03-22
GB237258A (en) 1925-12-24

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