US2258158A - Electric discharge lamp cathode - Google Patents

Electric discharge lamp cathode Download PDF

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Publication number
US2258158A
US2258158A US366855A US36685540A US2258158A US 2258158 A US2258158 A US 2258158A US 366855 A US366855 A US 366855A US 36685540 A US36685540 A US 36685540A US 2258158 A US2258158 A US 2258158A
Authority
US
United States
Prior art keywords
coating
coil
cathode
minor
turns
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
US366855A
Other languages
English (en)
Inventor
Erwin F Lowry
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.)
Hygrade Sylvania Corp
Original Assignee
Hygrade Sylvania 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 NL76841D priority Critical patent/NL76841C/xx
Priority to BE481787D priority patent/BE481787A/xx
Application filed by Hygrade Sylvania Corp filed Critical Hygrade Sylvania Corp
Priority to US366855A priority patent/US2258158A/en
Application granted granted Critical
Publication of US2258158A publication Critical patent/US2258158A/en
Priority to GB20499/47A priority patent/GB647954A/en
Priority to FR950546D priority patent/FR950546A/fr
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
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/04—Electrodes; Screens; Shields
    • H01J61/06—Main electrodes
    • H01J61/067—Main electrodes for low-pressure discharge lamps
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/04—Electrodes; Screens; Shields
    • H01J61/06—Main electrodes
    • H01J61/067—Main electrodes for low-pressure discharge lamps
    • H01J61/0672—Main electrodes for low-pressure discharge lamps characterised by the construction of the electrode

Definitions

  • This invention relates to cathodes for electric gaseous discharge lamps and more particularly 1 to the structure of such of said cathodes as have a coating thereon.
  • An object of my invention is to provide a cathode of such a structure that it will provide a desirable surface area to which the oxide coating may be applied.
  • Another object is to provide a cathode which will protect the oxide coating from the direct line of the discharge across the lamp.
  • a further object is to provide a cathode of a structure which will aid in the prevention of vaporization and sputtering of the oxide coating.
  • Another object isto provide a method of coating said cathode.
  • Figure 2 is a detail to a somewhat larger scale of a portion of the coiled-coil cathode after coating but before blowing
  • Figure 3 is a detail to a somewhat larger scale of the coiled-coil cathode showing the coating held between the turns of the minor coil after blowing;
  • Figure 4 is a detail shown partly in section of a segment of the minor coil of the cathode shown in Figure 3, showing the manner in which the coating is held between the turns of the minor coil. This figure is drawn to an arc of infinite radius for the sake of clarity and is on a greatly enlarged scale.
  • This coiled-coll cathode is formed by winding a wire into a minor coil and then winding the minor coil to form a major coil.
  • This cathode appears very similar to a single coil.
  • the cathode may be coated in the usual manner. 1. e. by dipping, spraying, or some similar means. However, I have found that by applying the coating by means of an eye-dropper, the coating will flow freely through and into the turns of the coiled coil. This will naturally result in both the major and the minor coils of the coiled-coil cathode becoming filled with coating, as shown in Figure 2,
  • the cathode thus coated is immediately passed over an air jet,v out of which air under pressure is flowing. ,The pressure of the air and the speed at which the cathode is passed through this flow of air is adjusted so that the coating is blown from the major coil and the main body of the coating now remaining completely fills the turns of the minor coil as shown in Figure 3.
  • the quantity of cathode coating material to be used on different types and sizes of cathodes is usually a predetermined amount
  • the viscosity and the density of the coating solution. are also adjusted so that after the coating has been applied and blown. there will be a thin film of coatin'g on the outer surface of the minor coil and the space within the core of the minorcoil is completely filled with the coating.
  • Figure 4 shows how the cathode coating is closely held and tightly packed in the turns of the minor coll. It is this minor coil which carries the cathod coating. The major coil is formed when this minor coil is wound to form a major coil. With the coating thus protected, the vaporization, sputtering and sparking of the oxide coating will no longer occur for the coating has been removed from the direct line of the discharge. Thus the condensation of cathode coating materials on the walls of the lamp, which would take place if a cathode as shownin Figure 2 were used, will no longer take place if a cathode as shown in Figure 3 is used.
  • An electric discharge lamp cathode comprising: a coiled-coil tungsten wire filament having a major and a minor coil; and an alkaline earth oxide coating filling the space withinthe minor coil only.
  • An electric discharge lamp cathod comprising: a coiled-coil tungsten wire filament having a major and a minor coil; and an alkaline earth oxide coating filling, the entire quantity of which is held within and fills the turns of the minor coil.
  • An electric discharge lamp cathode comprising: a coiled-coil tungsten wire filament having a major and a minor coil; and an alkaline earth oxide filling, the entire quantity of which is held within and fills the turns of the minor coil, with the wire on the outside surface of the minor coil and the spac within the major coil, being free from said alkaline earth oxide.
  • An electric discharge device cathode comprising: a coiled-coil tungsten wire filament having a major and a minor coil, the turns of each coil being spaced from the other turns of the same coil; and an alkaline-earth oxide coating substantially filling the minor coil only.

Landscapes

  • Discharge Lamp (AREA)
US366855A 1940-11-23 1940-11-23 Electric discharge lamp cathode Expired - Lifetime US2258158A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
NL76841D NL76841C (sh) 1940-11-23
BE481787D BE481787A (sh) 1940-11-23
US366855A US2258158A (en) 1940-11-23 1940-11-23 Electric discharge lamp cathode
GB20499/47A GB647954A (en) 1940-11-23 1947-07-29 Electric gaseous discharge lamp cathode
FR950546D FR950546A (fr) 1940-11-23 1947-07-31 Perfectionnement aux cathodes pour lampes à décharge électrique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US366855A US2258158A (en) 1940-11-23 1940-11-23 Electric discharge lamp cathode

Publications (1)

Publication Number Publication Date
US2258158A true US2258158A (en) 1941-10-07

Family

ID=23444848

Family Applications (1)

Application Number Title Priority Date Filing Date
US366855A Expired - Lifetime US2258158A (en) 1940-11-23 1940-11-23 Electric discharge lamp cathode

Country Status (5)

Country Link
US (1) US2258158A (sh)
BE (1) BE481787A (sh)
FR (1) FR950546A (sh)
GB (1) GB647954A (sh)
NL (1) NL76841C (sh)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2424518A (en) * 1944-12-04 1947-07-22 Gen Electric Coil electrode
US2560933A (en) * 1949-02-17 1951-07-17 Sylvania Electric Prod Lamp electrode
US2657325A (en) * 1950-12-23 1953-10-27 Sylvania Electric Prod Electrode for electric discharge lamps
US2663816A (en) * 1949-09-28 1953-12-22 Sylvania Electric Prod Electric discharge lamp
DE1038656B (de) * 1954-06-29 1958-09-11 Western Electric Co Verfahren zum UEberziehen einer Kathode fuer gasgefuellte Roehren
US2917650A (en) * 1955-06-29 1959-12-15 Hyperion Sa Electrode for discharge tubes
US2935637A (en) * 1957-03-05 1960-05-03 Thomas M Cortese Fluorescent lamp
US2961568A (en) * 1957-11-14 1960-11-22 Gen Electric Filament joint for incandescent lamps
DE974434C (de) * 1947-06-05 1960-12-22 Patra Patent Treuhand Elektrische Niederdruck-Entladungslampe
US3247699A (en) * 1962-01-12 1966-04-26 Westinghouse Electric Corp Manufacture of multiply-coiled electrodes for discharge devices
US3312856A (en) * 1963-03-26 1967-04-04 Gen Electric Rhenium supported metallic boride cathode emitters
US3546519A (en) * 1968-08-21 1970-12-08 Tokyo Shibaura Electric Co Fluorescent lamps with coil electrodes and electrode support structure
US4523125A (en) * 1981-07-13 1985-06-11 General Electric Company Fluorescent lamp electrodes
US5680003A (en) * 1995-05-19 1997-10-21 General Electric Company Coiled-coil filament design for an incandescent lamp

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2424518A (en) * 1944-12-04 1947-07-22 Gen Electric Coil electrode
DE974434C (de) * 1947-06-05 1960-12-22 Patra Patent Treuhand Elektrische Niederdruck-Entladungslampe
US2560933A (en) * 1949-02-17 1951-07-17 Sylvania Electric Prod Lamp electrode
US2663816A (en) * 1949-09-28 1953-12-22 Sylvania Electric Prod Electric discharge lamp
US2657325A (en) * 1950-12-23 1953-10-27 Sylvania Electric Prod Electrode for electric discharge lamps
DE1038656B (de) * 1954-06-29 1958-09-11 Western Electric Co Verfahren zum UEberziehen einer Kathode fuer gasgefuellte Roehren
US2917650A (en) * 1955-06-29 1959-12-15 Hyperion Sa Electrode for discharge tubes
US2935637A (en) * 1957-03-05 1960-05-03 Thomas M Cortese Fluorescent lamp
US2961568A (en) * 1957-11-14 1960-11-22 Gen Electric Filament joint for incandescent lamps
US3247699A (en) * 1962-01-12 1966-04-26 Westinghouse Electric Corp Manufacture of multiply-coiled electrodes for discharge devices
US3312856A (en) * 1963-03-26 1967-04-04 Gen Electric Rhenium supported metallic boride cathode emitters
US3546519A (en) * 1968-08-21 1970-12-08 Tokyo Shibaura Electric Co Fluorescent lamps with coil electrodes and electrode support structure
US4523125A (en) * 1981-07-13 1985-06-11 General Electric Company Fluorescent lamp electrodes
US5680003A (en) * 1995-05-19 1997-10-21 General Electric Company Coiled-coil filament design for an incandescent lamp

Also Published As

Publication number Publication date
GB647954A (en) 1950-12-28
NL76841C (sh)
BE481787A (sh)
FR950546A (fr) 1949-09-29

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