US2020708A - Gaseous electric discharge lamp device - Google Patents

Gaseous electric discharge lamp device Download PDF

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Publication number
US2020708A
US2020708A US750714A US75071434A US2020708A US 2020708 A US2020708 A US 2020708A US 750714 A US750714 A US 750714A US 75071434 A US75071434 A US 75071434A US 2020708 A US2020708 A US 2020708A
Authority
US
United States
Prior art keywords
container
lamp
lamp device
electric discharge
heat
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
US750714A
Other languages
English (en)
Inventor
Uyterhoeven Willem
Martinus Van Dam
Verburg Cornelis
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 US2020708A publication Critical patent/US2020708A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V19/00—Fastening of light sources or lamp holders
    • F21V19/006—Fastening of light sources or lamp holders of point-like light sources, e.g. incandescent or halogen lamps, with screw-threaded or bayonet base
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/52—Cooling arrangements; Heating arrangements; Means for circulating gas or vapour within the discharge space
    • H01J61/523—Heating or cooling particular parts of the lamp

Definitions

  • the present invention relates to gaseous electric discharge lamp devices generally and more particularly the invention relates to such devices the gaseous atmosphere of which consists of or comprises the vapor of a difficultly vaporizable metal i. e. a metal having a vapor pressure of less than 1 mm. at a temperature of 200 C., such as sodium, cadmium, thallium, or zinc.
  • a difficultly vaporizable metal i. e. a metal having a vapor pressure of less than 1 mm. at a temperature of 200 C., such as sodium, cadmium, thallium, or zinc.
  • Heat conservators such as an evacuated envelope enclosing the lamp container, or a double walled jacket having the space between the inner and outer walls thereof evacuated and in which the lamp container is mounted, which reduce the transfer of heat from the lamp container to the ambient atmosphere and thus maintain the container at an elevated temperature are useful in obtaining an effective vapor pressure in such devices, that is a vapor pressure such that the spectrum of the light emitted by the device is rich in rays characteristic of the metal vapor during the operation of the device.
  • the vapor pressure in vapor lamps generally is determined by the lowest temperature in the lamp and the heating of parts of the lamp above the temperature of the part thereof having the lowest temperature has no effect on the vapor pressure. Indeed in a lamp having difllcultly vaporizable material therein excess heating of parts of the container may be harmful to the lamp device since even the part of the container whichis at the lowest temperature during the operation of the lamp must have an elevated temperature in order to have an effective vapor pressure in the lamp and when other parts of the lamp container are heated greatly above this temperature there is danger of the metal vapor attacking the glass chemically or of the glass becoming soft and the container collapsing. An appreciable amount of energy is also wasted in such useless heating of parts of the lamp container.
  • the curved section is usually at a lower temperature than the straight sections during the operation of the device due to the larger heat radiating area thereof.
  • the object of the present invention is to provide a lamp unit comprising a gaseous electric discharge lamp device having a container consisting of straight portions and curved portions and a heat conservator in which all parts of the lamp container are at approximately the same temperature during the operation of the device.
  • the invention 5 comprises a coating which is a good heat interceptor either by virtue of its good reflecting qualities or by virtue of its poor heat conductivity characteristics, which coating is in operative relation to the curved part of the container to reduce the dissipation of heat therefrom.
  • the coating is applied to the curved part of the container.
  • the coating is applied to the part of the walls of the heat conservator adjacent the curved part of the lamp container.
  • the new and novel lamp unit comprises a gaseous electric discharge lamp device having a U-shaped container l and a double walled jacket 4 having the space between the inner and outer walls thereof evacuated.
  • Said container I has an electrode 2 sealed therein at each end thereof, a starting, rare gas therein, such as argon or neon, at a pressure of approximately 1 to 10 mm. and a quantity of vaporizable material therein, such as sodium.
  • Said electrodes 2 are electron emitting when heated and consist of a metal filament, such as a tungsten filament, having another filament, such as a tungsten or a nickel filament, wrapped around said first named filament and a coating of electron emitting material, such as barium oxide, applied to said filaments.
  • Said electrodes 2 are heated to an electron emitting temperature by the discharge current.
  • Said container I has a bayonet base 3 cemented to one end thereof and the other end of said container I is covered by said base 3 but is free to move therein. Said container I thus can contract and expand freely during the life of the lamp device without danger of fracturing the walls thereof.
  • the jacket 9 has a ring-base 5 of insulating material cemented thereto and said base 5 frictionally engages with said base 3 andis locked in position thereon by the pin 6.
  • the outer surface of-the curved, lower portion I of container l has a thin coating I oi. reflecting material, such as silver, thereon which coating 1 reflects the heat of said curved'part and thus reduces the dissipation of heat from said curved part so that the temperature of said curved part is made approximately that of the straight parts at said container i during the operation oi said lamp unit.
  • the coating l is omitted from thecurved part of the container I and a similar coating 8 (indicated in dotted lines) is applied to one or both of the walls oi the rounded, end part oi the jacket d adjacent the curved part of the container i and on the side of said walls facing said curved container part.
  • the coatings d reflect back to the container i an appreciable part of the heat radiated by the container i with the result pointed out above.
  • the silver coating be a dustlike deposit, or a very thin film which transmits all the visible light emitted by the lamp device but which reflects all the infra-red, or heat rays emitted by the device.
  • a coating is applied to the lamp container, or the heat conservator, by methods well known in the art, such as by chemical deposition or cathode sputtering.
  • the coatings i and 8 consist of a material having poor heat conductivity characteristics, such as a thin layer of asbestos, which likewise reduces the dissipation of heat from said curved container part.
  • a lamp unit comprising a gaseous electric discharge lamp device having a container consisting of two straight parts and a curved part connecting said straight parts, electrodes sealed into said container and a vaporizable material in said container, a heat conservator .in which said lamp device is mounted and a heat interceptor interposed between the curved part of said container and the ambient atmosphere.
  • a lamp unit comprising a gaseous electric discharge lamp device having a container consisting of two straight parts and a curved part connecting said straight parts, electrodes sealed into said container and a vaporizable material in saidcontainer, a double walled Jacket having the space between the inner and outer walls thereof evacuated and in which said lamp device is mounted and a heat interceptor interposed between the curved part oi said container and the ambient atmosphere.
  • a lamp unit comprising a gaseous electric discharge lamp device having a container consisting of two straight parts and a curved part connecting said straight parts, electrodes sealed into said container and a vaporizable material in said container, a double walled Jacket having the space between the inner and outer walls thereof evacuated and in which said lamp device is mounted and a reflecting coating on the curved part of said container to reduce the dissipation of heat from said curved part.
  • a lamp unit comprising a gaseous electric discharge lamp device having a container consisting of two straight parts and a curved part connecting said straight parts, electrodes sealed into said container and a vaporizable material in 2 said container, a double walled jacket having the space between the inner and outer walls thereof evacuated and in which said lamp device is mounted and a reflecting coating'on the part of said jacket adjacent the curved part of 3 said container.
  • a lamp unit comprising a gaseous electric discharge lamp device having a container consisting of two straight parts and a curved part connecting said straight parts, electrodes sealed 3 into said container and a vaporizable material in said container, a double walled jacket having the space between the inner and outer walls thereof evacuated and in which said lamp device is mounted and a coating of material having poor heat conducting characteristics on the curved part of said container.
  • a lamp unit comprising a gaseous electric discharge lamp device having a container consisting of two straight parts and a curved part 4 connecting said straight parts, electrodes sealed into said container and a vaporizable material in said container, a double walled jacket having the space between the inner and outer walls thereof evacuated and in which said lamp device is mounted and a coating of material having poor heat conducting characteristics on the part of said jacket adjacent the curved part of said container.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Chemical Vapour Deposition (AREA)
US750714A 1933-11-06 1934-10-30 Gaseous electric discharge lamp device Expired - Lifetime US2020708A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE433589X 1933-11-06

Publications (1)

Publication Number Publication Date
US2020708A true US2020708A (en) 1935-11-12

Family

ID=6500654

Family Applications (1)

Application Number Title Priority Date Filing Date
US750714A Expired - Lifetime US2020708A (en) 1933-11-06 1934-10-30 Gaseous electric discharge lamp device

Country Status (4)

Country Link
US (1) US2020708A (ja)
FR (2) FR433589A (ja)
GB (1) GB433589A (ja)
NL (1) NL42087C (ja)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2645665C2 (de) * 1976-10-09 1983-01-27 Erco Leuchten GmbH, 5880 Lüdenscheid Leuchte
NL7810672A (nl) * 1978-10-26 1980-04-29 Philips Nv Lagedrukkwikdampontladingslamp.
GB2137407B (en) * 1983-03-24 1986-09-24 Emi Plc Thorn Low pressure discharge lamps
DE3535881A1 (de) * 1985-10-08 1987-04-16 Preh Elektro Feinmechanik Beleuchtungseinrichtung fuer eine frontplatte

Also Published As

Publication number Publication date
FR780700A (fr) 1935-04-30
GB433589A (en) 1935-08-16
FR433589A (fr) 1912-01-10
NL42087C (ja)

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