US2488716A - Electric high-pressure discharge tube - Google Patents

Electric high-pressure discharge tube Download PDF

Info

Publication number
US2488716A
US2488716A US658409A US65840946A US2488716A US 2488716 A US2488716 A US 2488716A US 658409 A US658409 A US 658409A US 65840946 A US65840946 A US 65840946A US 2488716 A US2488716 A US 2488716A
Authority
US
United States
Prior art keywords
discharge
electrode
strip
conductor
tube
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
US658409A
Other languages
English (en)
Inventor
Elenbaas Willem
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
Application granted granted Critical
Publication of US2488716A publication Critical patent/US2488716A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • H01J61/073—Main electrodes for high-pressure discharge lamps
    • H01J61/0732—Main electrodes for high-pressure discharge lamps characterised by the construction of the electrode

Definitions

  • incandescent electrodes consisting of a core coated with a layer of a substance having a high electron-emitting capacity, which layer often entirely or partly consists of alkaline earth oxides.
  • incandescent electrodes are usually not heated by a separate heating current, but exclusively by the discharge so that only one supply conductor is required for each electrode. In many cases such an electrode is nevertheless provided with two supply conductors, of which only one is used during operation or which are electrically interconnected.
  • the core of this incandescent electrode consists of metal (as a rule of a refractory metal such as tungsten) and is frequently helically wound. Furthermore, it is known to wind a second wire helically on a metal wire, the assembly being helically wound again. In this way a solid assembly can be obtained which is adapted to be secured only by one end to a supporting wire, the axis of the helix coinciding with the axis of the discharge tube. After that the cores thus formed,
  • the invention concerns high-pressure discharge tubes having one or more incandescent electrodes that are heated solely by the discharge during normal operation and consist of a metal core coated with a substance having a high electronic emitting capacity.
  • the invention purports to improve these discharge tubes, more particularly as regards the incandescent electrodes available therein.
  • the core of these electrodes is shaped as a band and is so folded as to form a reentrant part containing the substance having a higher electron-emissive capacity.
  • the electrode has a low weight so that the risk of breaking of the electrode from the supporting wire to which it is attached, which sometimes occurs in transporting the discharge tube, is but small.
  • the cost of manufacture is low.
  • Each end of the tube contains an electrode 2 which is represented in perspective in Fig. 2.
  • this electrode consists of a strip of tungsten having a thickness of 0.1 mm., a width of 5 mms. and a length of 20 mms.
  • This strip is folded in the form of a heart having a reentrant part 3 containing the electron-emissive substance 4 consisting, for instance, of alkaline earth oxide (more particularly barium and/or strontium oxide) mixed, if required, with other substances such as, for instance, strontium oxide and quartz powder.
  • Both ends of the tungsten strip, which with its flat side is positioned perpendicularly to the axis of the tube, are secured to a lead-in conductor or wire 5-which is sealed into the wall of the tube with the interposition of a bead 6.
  • a voltage'loss Just as shown in Figs. 1 and 2 is provided with a re-entrant part forming a substantially cylindrical- If the heat 3 shaped groove which is transverse to the axis of the arc discharge path.
  • the discharge tube is filled with a rare gas, for instance, argon, at a pressure of 4 mms. and furthermore contains a quantity of mercury which is small so that the mercury vapour, after the tube has attained its state of equilibrium, is unsaturated.
  • a rare gas for instance, argon
  • mercury-vapour atmosphere 9 high-pressure discharge takes place, the vapour pressure mounting to about 1 atmosphere.
  • the tube which may be used for the emission of visible light or ultraviolet rays and has an internal diameter of 25 mms. and a distance between the electrodes of 100 ms. is fed from an alternating current supply and operated with a current strength of 2.5 amps, the voltage difference between the electrodes then being 120 volts.
  • the shape of the electrodes may be different from that represented in Fig. 2.
  • Fig. 3 for instance, represents another shape which is also very practicable.
  • the electrodes used in the tube have a low weight and can be easily shaped, whereby the manufacture of the electrodes and consequently of the tube is rendered cheap.
  • the dissipation of heat from the point where the discharge acts is very low owing to the tungsten strip.
  • a high pressure arc discharge device comprising spaced electrode structures for sustaining an arc therebetween, at least one of said electrode structures comprising a lead-in conductor and a folded strip of thin refractory metal sup ported by said conductor and having a re-entrant part forming a groove extending laterally across the strip and facing the arc path and transverse thereto, and electron-emissive material in said groove.
  • a high pressure discharge device comprising spaced electrode structures for sustaining an arc therebetween, at least one of said electrode structures comprising a lead-in conductor and a folded strip of thin tungsten supported by said conductor and having a re-entrant part forming a groove extending laterally across the strip and facing the arc path and transverse thereto, and an electron-emissive material comprising an alkaline earth oxide in said groove.
  • a. high pressure are discharge device comprising spaced electrode structures for sustaining an arc therebetween, at least one of said electrode structures comprising a lead-in conductor and a folded strip of refractory metal havlog a thickness of 0.1 mm. supported by said conductor and having a re-entrant part forming a groove extending laterally across the strip and facing the arc path and transverse thereto, and electron-emissive material including an alkaline earth oxide in said groove.
  • a high pressure discharge device comprising spaced electrode combinations for sustaining an arc therebetween, at least one of the electrode combinations comprising a lead-in conductor, a folded strip of refractory metal having a re-entrant part forming a groove extending laterally across the strip and facing the arc path and transverse thereto, the thickness of said strip in microns being less than 100 times the discharge device operating ,current in amperes and the width of said strip being at least 10 times the thickness thereof, and electron-emissive material in said groove.
  • a high pressure discharge device comprising spaced electrode structures for sustaining an arc therebetween, at least one of said electrode structures comprising a lead-in conductor and a folded strip of thin refractory metal supported by said conductor and having a re-entrant part forming a substantially cylindrical-shaped recess extending laterally across the strip and transverse to the arc path, and electron-emissive material in said recess.
  • a high pressure arc discharge device comprising spaccd electrode structures for sustaining an arc therebetween, at least one of said elece trode structures comprising a lead-in conductor and a folded strip of thin refractory metal secured at bothends to said conductor and having intermediate its ends a reentrant part forming a groove extending laterally across the strip and facing the arc path and transverse thereto, and electron emissive material in said groove.

Landscapes

  • Discharge Lamp (AREA)
US658409A 1942-08-13 1946-03-30 Electric high-pressure discharge tube Expired - Lifetime US2488716A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL239109X 1942-08-13

Publications (1)

Publication Number Publication Date
US2488716A true US2488716A (en) 1949-11-22

Family

ID=19780440

Family Applications (1)

Application Number Title Priority Date Filing Date
US658409A Expired - Lifetime US2488716A (en) 1942-08-13 1946-03-30 Electric high-pressure discharge tube

Country Status (5)

Country Link
US (1) US2488716A (enrdf_load_stackoverflow)
BE (1) BE451865A (enrdf_load_stackoverflow)
CH (1) CH239109A (enrdf_load_stackoverflow)
FR (1) FR897204A (enrdf_load_stackoverflow)
GB (1) GB624013A (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2677778A (en) * 1952-03-31 1954-05-04 Atomic Energy Commission Linear cathode
US2699514A (en) * 1951-11-28 1955-01-11 Duro Test Corp Fluorescent lamp
US2786957A (en) * 1953-04-02 1957-03-26 Csf Emissive cathodes
US2813995A (en) * 1952-10-22 1957-11-19 Gen Electric Cathode and method of manufacture
US2875367A (en) * 1954-10-22 1959-02-24 Gen Electric Cathode structures
US3179832A (en) * 1960-01-12 1965-04-20 Field Emission Corp Temperature enhanced field emission x-ray tube

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2926277A (en) * 1960-02-23 white
NL6411355A (enrdf_load_stackoverflow) * 1964-09-30 1966-03-31

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2008066A (en) * 1933-02-17 1935-07-16 Quarzlampen Gmbh Gas or vapor discharge tube
US2175345A (en) * 1935-07-12 1939-10-10 Gen Electric Electric gaseous discharge device
US2249672A (en) * 1936-12-10 1941-07-15 Gen Electric Discharge device
US2267318A (en) * 1939-03-21 1941-12-23 Gen Electric Electrode and terminal structure for electric discharge devices
US2310983A (en) * 1940-02-20 1943-02-16 Samuel C Miller Electrode for luminous tubes and method of producing the same
US2404057A (en) * 1943-03-24 1946-07-16 Westinghouse Electric Corp End-cap electrode for discharge lamps

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2008066A (en) * 1933-02-17 1935-07-16 Quarzlampen Gmbh Gas or vapor discharge tube
US2175345A (en) * 1935-07-12 1939-10-10 Gen Electric Electric gaseous discharge device
US2249672A (en) * 1936-12-10 1941-07-15 Gen Electric Discharge device
US2267318A (en) * 1939-03-21 1941-12-23 Gen Electric Electrode and terminal structure for electric discharge devices
US2310983A (en) * 1940-02-20 1943-02-16 Samuel C Miller Electrode for luminous tubes and method of producing the same
US2404057A (en) * 1943-03-24 1946-07-16 Westinghouse Electric Corp End-cap electrode for discharge lamps

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2699514A (en) * 1951-11-28 1955-01-11 Duro Test Corp Fluorescent lamp
US2677778A (en) * 1952-03-31 1954-05-04 Atomic Energy Commission Linear cathode
US2813995A (en) * 1952-10-22 1957-11-19 Gen Electric Cathode and method of manufacture
US2786957A (en) * 1953-04-02 1957-03-26 Csf Emissive cathodes
US2875367A (en) * 1954-10-22 1959-02-24 Gen Electric Cathode structures
US3179832A (en) * 1960-01-12 1965-04-20 Field Emission Corp Temperature enhanced field emission x-ray tube

Also Published As

Publication number Publication date
CH239109A (de) 1945-09-15
FR897204A (fr) 1945-03-15
BE451865A (enrdf_load_stackoverflow)
GB624013A (en) 1949-05-26

Similar Documents

Publication Publication Date Title
US4105908A (en) Metal halide lamp having open tungsten coil electrodes
US2765420A (en) Lamp electrode
US2733371A (en) Internally conducttvely coated
US2549355A (en) Fluorescent lamp
US2315286A (en) Gaseous discharge lamp
US2488716A (en) Electric high-pressure discharge tube
US2314134A (en) Gaseous discharge device
US2429118A (en) Electrode for fluorescent tubes
US2171234A (en) Discharge device and electrode
US2241362A (en) Electron emissive cathode
US4413204A (en) Non-uniform resistance cathode beam mode fluorescent lamp
US2244070A (en) Electrode for gaseous discharge tubes
US2508114A (en) Tantalum electrode for electric discharge devices
US3265917A (en) Fail-safe arc discharge lamp with integral arc extinguishing means
US4987342A (en) Self-ballasted glow discharge lamp having indirectly-heated cathode
US3356884A (en) Electrode starting arrangement having a coiled heating element connected to the retroverted portion of the electrode
US3013175A (en) High output discharge lamp
US3328622A (en) Electric discharge device having primary and secondary electrodes
US2241345A (en) Electron emissive cathode
US3069580A (en) Fluorescent lamp
US2479164A (en) Electric glow discharge lamp
US4356428A (en) Lighting system
US2959702A (en) Lamp and mount
US3069581A (en) Low pressure discharge lamp
US3519872A (en) Thermionic electrode with an auxiliary starting coil for a discharge lamp