US2001510A - Lamp unit - Google Patents

Lamp unit Download PDF

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Publication number
US2001510A
US2001510A US715951A US71595134A US2001510A US 2001510 A US2001510 A US 2001510A US 715951 A US715951 A US 715951A US 71595134 A US71595134 A US 71595134A US 2001510 A US2001510 A US 2001510A
Authority
US
United States
Prior art keywords
tube
curved part
container
parts
lamp unit
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
US715951A
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English (en)
Inventor
Uyterhoeven Willem
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 US2001510A publication Critical patent/US2001510A/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
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/30—Vessels; Containers
    • H01J61/34—Double-wall vessels or containers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/30—Vessels; Containers
    • H01J61/32—Special longitudinal shape, e.g. for advertising purposes
    • H01J61/325—U-shaped lamps

Definitions

  • the present invention relates to lamp units generally and more particularly the invention relates to such units comprising a gaseous electric discharge lamp device the gaseous atmosphere of 5 which consists of or comprises a metal vapor.
  • a lamp unit which comprises a heat conservator surrounding a gaseous electric discharge lamp device having a U-shaped tubular container and a gaseous atmosphere therein comprising the vapor of a difiicultly vaporizable metal, i. e., a metal the vapor pressure of which at a temperature of 200 degrees C. is less than 1 mm., such as sodium, potassium, rubidium, cadmium, magnesium, thallium or zinc.
  • a difiicultly vaporizable metal i. e., a metal the vapor pressure of which at a temperature of 200 degrees C. is less than 1 mm., such as sodium, potassium, rubidium, cadmium, magnesium, thallium or zinc.
  • a lamp unit which comprises a heat conservator surrounding a gaseous electric discharge lamp device having a gaseous atmosphere similar to that mentioned above and an elongated tubular container having curved parts.
  • the object of the present invention is to increase the luminous efllciency of lamp units of the above type. Still further objects and advantages attaching to the device and to its use and operation will be apparent to those skilled in the art from the following particular description.
  • the heat development in the tube is adapted in a simple manner to the heat emitted by the wall of the tube.
  • the energy consumed for the heating of the wall of the tube is, therefore, utilized to the greatest possible extent whereby the efficiency of the 5 tube is increased.
  • the most favorable internal diameter of the curved part can be determined for each case.
  • the most favorable construction is obtained if this cross-section is made exactly 10 of such a size that the curved part assumes the same temperature as the straight parts of the tube.
  • a considerable portion of this effect can be obtained by giving the narrower part a cross-section that difiers somewhat from the 15 most favorable value.
  • the crosssection of the curved part of the tube is made at least 10 per cent smaller than the cross-section of the straight parts.
  • the new and novel gaseous electric discharge lamp device comprises an elongated, tubular container whichhas two straight parts I and 2 which are connected by a curved part 3.
  • electrodes are arranged, namely a cathode 4 which is a metal filament, such as a tungsten filament, coated with an electron emitting material, such as barium oxide, and which is electron emitting when heated and a cylindrical anode 5.
  • the current-supply wire of this anode 5 is connected inside or outside the tube with one of the current-supply wires of the cathode 5.
  • the internal cross-section of the part 3 is considerably smaller than those of .parts I and 2 of the tube.
  • the internal diameter of the straight parts I and 2 is for instance 20 mm.
  • the internal diameter of the curved part 3 is for instance l0 mm.
  • the voltage gradient is, therefore, larger in part 3 than in the straight parts of the tube, so that in the first-mentioned part,
  • the tube contains a rare, starting gas, such as neon, and the vapor of a dimcultly vaporizable material, such as sodium. .
  • the metal vapor participates in the discharge which takes place in the tube which should not always be considered as, meaning that'the metal vapor carries a part of the ,current. Under certain circumstances, it is also possible that the metal-vapor molecules, without participating in the current conduction, are merely excited and emit light. As a result of the uniform temperature oi! the wall of the tube, the required vapor pressure will be obtained in a very favorable manner which contributes to a considerable extent to the increase oi the eiilciency of the discharge tube.
  • the above described lamp device is ,mounted in a heat conservator i which is a double-walled Jacket having the space between the walls evacuated or filled with a gas having poor heat conductivity characteristics at a pressure lower than atmospheric pressure. It will be understood, of course, that the space between the jacket and the lamp container is closed 01! from the outside atmosphere by a body of heat insulating material, such as asbestos, and that a base is provided for the heat conservator and the lamp therein to form a complete lamp unit. These elements have been omitted from the drawing for purposes of simplicity of illustration.
  • a lamp unit comprising in combination, a gaseous electric discharge lamp device comprising an elongated, tubular sealed container, a gaseous'atmosphere therein comprising a metal vapor, electrodes sealed therein, a heat conservator in operative relation to said lamp device, said container having straight parts and a curved part connecting said straight parts, the inside diameter of said curved part being less than the internal diameter of said straight parts.
  • a lamp unit comprising in combination, a gaseous electric discharge lamp device comprising an elongated, tubular, sealed container, a gaseous atmosphere therein comprising a metal vapor, electrodes sealed therein, a-heat conservator in operative relation to said lamp device, said container having straight parts and a curved part connecting said straight parts, the inside diameter of said curved part being at least 10% leslsts than the internal diameter of said straight pa 3.
  • a lamp unit comprising in combination, a gaseous electric discharge lamp device comprising an elongated, tubular, sealed container, a gaseous atmosphere comprising a rare, starting gas and a metal vapor, electrodes sealed therein, a heat conservator in operative relation to said lamp device, said container having straight, parts and a curved part connecting said straight parts, the inside diameter of said curved part being less than the internal diameter oi! said straight parts.
  • a lamp unit comprising in combination, a gaseous electric discharge lamp device comprising an elongated, tubular, sealed container, a gaseous atmosphere therein comprising a rare, starting gas and sodium vapor, electrodes sealed therein, a heat conservator in operative relation to said lamp device, said container having straight parts and a curved part connecting said straight parts, the inside diameter of said curved part being less than the internal diameter or said straight parts.

Landscapes

  • Discharge Lamp (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
US715951A 1933-04-04 1934-03-16 Lamp unit Expired - Lifetime US2001510A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE414608X 1933-04-04

Publications (1)

Publication Number Publication Date
US2001510A true US2001510A (en) 1935-05-14

Family

ID=6448372

Family Applications (1)

Application Number Title Priority Date Filing Date
US715951A Expired - Lifetime US2001510A (en) 1933-04-04 1934-03-16 Lamp unit

Country Status (4)

Country Link
US (1) US2001510A (de)
FR (1) FR771173A (de)
GB (1) GB414608A (de)
NL (1) NL44356C (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58172857A (ja) * 1982-03-31 1983-10-11 Matsushita Electric Works Ltd 螢光ランプ
JPH05215673A (ja) * 1992-01-31 1993-08-24 Shimadzu Corp 低圧放電管及びそれを用いた原子吸光分光光度計
WO1995017002A2 (de) * 1993-12-16 1995-06-22 Strueber Dieter Verfahren zur herstellung einer entladungslampe und entladungslampe daraus
DE19613358C1 (de) * 1996-04-03 1997-10-09 Heraeus Noblelight Gmbh Optischer Strahler

Also Published As

Publication number Publication date
NL44356C (de)
GB414608A (en) 1934-08-09
FR771173A (fr) 1934-10-02

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