EP0081918A2 - Hochdrucknatriumlampe - Google Patents

Hochdrucknatriumlampe Download PDF

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Publication number
EP0081918A2
EP0081918A2 EP82306133A EP82306133A EP0081918A2 EP 0081918 A2 EP0081918 A2 EP 0081918A2 EP 82306133 A EP82306133 A EP 82306133A EP 82306133 A EP82306133 A EP 82306133A EP 0081918 A2 EP0081918 A2 EP 0081918A2
Authority
EP
European Patent Office
Prior art keywords
lamp
sodium
mole fraction
range
arc 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.)
Withdrawn
Application number
EP82306133A
Other languages
English (en)
French (fr)
Other versions
EP0081918A3 (de
Inventor
Paul Linley Denbigh
Bryan Frederick Jones
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.)
EMI Group Ltd
Original Assignee
Thorn EMI PLC
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 Thorn EMI PLC filed Critical Thorn EMI PLC
Publication of EP0081918A2 publication Critical patent/EP0081918A2/de
Publication of EP0081918A3 publication Critical patent/EP0081918A3/de
Withdrawn legal-status Critical Current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
    • H01J61/12—Selection of substances for gas fillings; Specified operating pressure or temperature
    • H01J61/18—Selection of substances for gas fillings; Specified operating pressure or temperature having a metallic vapour as the principal constituent
    • H01J61/22—Selection of substances for gas fillings; Specified operating pressure or temperature having a metallic vapour as the principal constituent vapour of an alkali metal
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/82—Lamps with high-pressure unconstricted discharge having a cold pressure > 400 Torr
    • H01J61/825—High-pressure sodium lamps

Definitions

  • the present invention relates to high pressure sodium lamps which comprise a sealed discharge (arc) tube of a ceramic material, preferably polycrystalline alumina, in which a discharge takes place between electrodes at opposite ends thereof in a fill which includes sodium vapour in amalgam with mercury and an inert starting gas (usually Xenon at typically 20 torr cold fill pressure).
  • the invention is particularly concerned with the optimisation of the arc tube bore and the arc length between the electrodes in relation to the sodium mole fraction of a sodium amalgam part of the fill to improve the efficacy of the lamp.
  • a high pressure sodium lamp for operation at a power rating of 50 watts and at a lamp voltage drop in the range 70 to 130 volts
  • the lamp including a substantially tubular light-transmitting arc tube whose internal diameter is in the range 3.0 to 5.0 mm, having thermionic electrodes sealed into the end thereof and filled with an inert starting gas and a sodium amalgam having a sodium mole fraction in the range 0.63-0.8, the arc length I in mm between the electrodes being substantially defined by the equation where d is the arc tube internal diameter in mm, x is the sodium mole fraction, and V is the lamp voltage drop in volts.
  • a high pressure sodium lamp for operation at a power rating of 50 watts and at a lamp voltage in the range 70 to 90 volts
  • the lamp including: a substantially tubular light-transmitting arc tube whose internal diameter is in the range 3.0 to 4.5 mm, having thermionic electrodes sealed into the ends thereof and filled with an inert starting gas and a sodium amalgam having a sodium mole fraction in the range 0.63 - 0.80, the arc length between the electrode tips being determined substantially by the intersection of a line for a chosen arc tube bore with the line for a chosen lamp voltage and sodium mole fraction in Figure 3 of the accompanying drawings, or interpolation thereon.
  • the wall loading of the arc tubes is restricted to less than 20 W/cm 2 .
  • the cool spot temperature of the lamp is optimised by the adjustment of heat losses therefrom.
  • the present invention therefore provides a 50 watt high pressure sodium lamp with a lamp voltage of 70-130V, which is known to be a preferred range and taking certain criteria which may be specified within ranges known to give increased efficacy, adjusts other criteria further to increase the efficacy.
  • Figure 3 shows the dimensions required in accordance with this invention to achieve maximum efficacy for lamps adjusted using prior art techniques to be at their optimum cool spot temperature.
  • the Figure shows the are length, in mm, plotted as a function of the arc tube bore, in mm, for 50 watt high pressure sodium lamps intended to operate at 70 volts, 80 volts and 90 volts. This is repeated for each of three sodium mole fraction values, 0.63, 0.70 and 0.80 defining a range which is considered to be satisfactory, particularly from the aspect of colour. Also illustrated for reference are lines of constant wall loading.
  • the use of the graph may be illustrated by the example of the preferred 50 watt 80 volt high pressure sodium lamp. Taking a satisfactory middle range sodium mole fraction of 0.686 it can be seen that this lamp should have an arc length of 24.5 mm and an arc tube bore of 4.0 mm. The wall loading obtained is 15.2 W/cm 2 . The position of this lamp in Figure 3 has been indicated by a star and it is shown in the same manner in Figures 1 and 2.
  • the discharge may be caused to operate at maximum efficacy by the choice of an arc length t mm defined by: This equation is applied in the following examples.
  • FIG. 4 shows a preferred 50 watt 80 volt high pressure sodium lamp in accordance with this invention.
  • a polycrystalline alumina discharge tube 1 has a length of 24.5 mm plus the two electrode lengths (in this example a total of 36.3 mm).
  • the tube of internal diameter 4.0 mm and has end caps 2 in which electrodes (not shown) and external leads 3 are mounted.
  • the discharge tube is filled with a filling including Xenon starting gas at 20 torr cold fill pressure and a sodium amalgam with a sodium mole fraction of 0.686.
  • the assembly is mounted in an outer envelope 4 being supported therein by a conventional metal framework 5.
  • a conventional lamp base 6 is provided with a terminal 7.
  • the preferred 70 volt and 90 volt lamps are substantially the same apart from the dimensions of the arc tube which are about 10% shorter and 10% larger respectively.

Landscapes

  • Discharge Lamps And Accessories Thereof (AREA)
  • Discharge Lamp (AREA)
EP82306133A 1981-12-11 1982-11-17 Hochdrucknatriumlampe Withdrawn EP0081918A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8137489 1981-12-11
GB8137489 1981-12-11

Publications (2)

Publication Number Publication Date
EP0081918A2 true EP0081918A2 (de) 1983-06-22
EP0081918A3 EP0081918A3 (de) 1984-05-02

Family

ID=10526553

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82306133A Withdrawn EP0081918A3 (de) 1981-12-11 1982-11-17 Hochdrucknatriumlampe

Country Status (2)

Country Link
EP (1) EP0081918A3 (de)
JP (1) JPS58106752A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992012531A1 (en) * 1990-12-31 1992-07-23 Welch Allyn, Inc. Bulb geometry for low power metal halide discharge lamp
EP0837492A3 (de) * 1996-10-16 1998-05-27 Osram Sylvania Inc. Entladungslampe hoher Intensität mit einer Xenon enthaltende Füllung unter mittlerem Druck
EP1275128A4 (de) * 2000-01-20 2006-05-31 Osram Sylvania Inc Hochdruck natriumlampe mit bogengefäss reduzierten abmessungen

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3906272A (en) * 1974-04-01 1975-09-16 Gen Electric Low wattage high pressure sodium vapor lamps
EP0078105A3 (de) * 1981-10-28 1983-11-16 THORN EMI plc Hochdrucknatriumlampen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992012531A1 (en) * 1990-12-31 1992-07-23 Welch Allyn, Inc. Bulb geometry for low power metal halide discharge lamp
EP0837492A3 (de) * 1996-10-16 1998-05-27 Osram Sylvania Inc. Entladungslampe hoher Intensität mit einer Xenon enthaltende Füllung unter mittlerem Druck
EP1275128A4 (de) * 2000-01-20 2006-05-31 Osram Sylvania Inc Hochdruck natriumlampe mit bogengefäss reduzierten abmessungen

Also Published As

Publication number Publication date
EP0081918A3 (de) 1984-05-02
JPS58106752A (ja) 1983-06-25

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

Designated state(s): DE FR GB NL

PUAL Search report despatched

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Effective date: 19840815

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18W Application withdrawn

Withdrawal date: 19841218

RIN1 Information on inventor provided before grant (corrected)

Inventor name: JONES, BRYAN FREDERICK

Inventor name: DENBIGH, PAUL LINLEY